| 1. |
- Andersson, Oscar
(författare)
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Följeforskningsprocessen
- 2015
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Ingår i: Social mobilisering. - Malmö : Universus Press. ; :1, s. 221-259
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Bokkapitel (populärvet., debatt m.m.)
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| 2. |
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| 3. |
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| 4. |
- Ankarklev, Johan, et al.
(författare)
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Comparative genomic analyses of freshly isolated Giardia intestinalis assemblage A isolates
- 2015
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Ingår i: BMC Genomics. - : Springer Science and Business Media LLC. - 1471-2164. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- Background: The diarrhea-causing protozoan Giardia intestinalis makes up a species complex of eight different assemblages (A-H), where assemblage A and B infect humans. Comparative whole-genome analyses of three of these assemblages have shown that there is significant divergence at the inter-assemblage level, however little is currently known regarding variation at the intra-assemblage level. We have performed whole genome sequencing of two sub-assemblage AII isolates, recently axenized from symptomatic human patients, to study the biological and genetic diversity within assemblage A isolates. Results: Several biological differences between the new and earlier characterized assemblage A isolates were identified, including a difference in growth medium preference. The two AII isolates were of different sub-assemblage types (AII-1 [AS175] and AII-2 [AS98]) and showed size differences in the smallest chromosomes. The amount of genetic diversity was characterized in relation to the genome of the Giardia reference isolate WB, an assemblage AI isolate. Our analyses indicate that the divergence between AI and AII is approximately 1 %, represented by similar to 100,000 single nucleotide polymorphisms (SNP) distributed over the chromosomes with enrichment in variable genomic regions containing surface antigens. The level of allelic sequence heterozygosity (ASH) in the two AII isolates was found to be 0.25-0.35 %, which is 25-30 fold higher than in the WB isolate and 10 fold higher than the assemblage AII isolate DH (0.037 %). 35 protein-encoding genes, not found in the WB genome, were identified in the two AII genomes. The large gene families of variant-specific surface proteins (VSPs) and high cysteine membrane proteins (HCMPs) showed isolate-specific divergences of the gene repertoires. Certain genes, often in small gene families with 2 to 8 members, localize to the variable regions of the genomes and show high sequence diversity between the assemblage A isolates. One of the families, Bactericidal/ Permeability Increasing-like protein (BPIL), with eight members was characterized further and the proteins were shown to localize to the ER in trophozoites. Conclusions: Giardia genomes are modular with highly conserved core regions mixed up by variable regions containing high levels of ASH, SNPs and variable surface antigens. There are significant genomic variations in assemblage A isolates, in terms of chromosome size, gene content, surface protein repertoire and gene polymorphisms and these differences mainly localize to the variable regions of the genomes. The large genetic differences within one assemblage of G. intestinalis strengthen the argument that the assemblages represent different Giardia species.
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| 5. |
- Franzen, Oscar, et al.
(författare)
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Draft genome sequencing of Giardia intestinalis assemblage B isolate GS : is human giardiasis caused by two different species?
- 2009
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Ingår i: PLoS Pathogens. - : Public Library of Science (PLoS). - 1553-7366 .- 1553-7374. ; 5:8, s. e1000560-
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Tidskriftsartikel (refereegranskat)abstract
- Giardia intestinalis is a major cause of diarrheal disease worldwide and two major Giardia genotypes, assemblages A and B, infect humans. The genome of assemblage A parasite WB was recently sequenced, and the structurally compact 11.7 Mbp genome contains simplified basic cellular machineries and metabolism. We here performed 454 sequencing to 16 x coverage of the assemblage B isolate GS, the only Giardia isolate successfully used to experimentally infect animals and humans. The two genomes show 77% nucleotide and 78% amino-acid identity in protein coding regions. Comparative analysis identified 28 unique GS and 3 unique WB protein coding genes, and the variable surface protein (VSP) repertoires of the two isolates are completely different. The promoters of several enzymes involved in the synthesis of the cyst-wall lack binding sites for encystation-specific transcription factors in GS. Several synteny-breaks were detected and verified. The tetraploid GS genome shows higher levels of overall allelic sequence polymorphism (0.5 versus <0.01% in WB). The genomic differences between WB and GS may explain some of the observed biological and clinical differences between the two isolates, and it suggests that assemblage A and B Giardia can be two different species.
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| 6. |
- Jerlström-Hultqvist, Jon, et al.
(författare)
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Genome analysis and comparative genomics of a Giardia intestinalis assemblage E isolate.
- 2010
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Ingår i: BMC Genomics. - : Springer Science and Business Media LLC. - 1471-2164. ; 11, s. 543-
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Tidskriftsartikel (refereegranskat)abstract
- Background Giardia intestinalis is a protozoan parasite that causes diarrhea in a wide range of mammalian species. To further understand the genetic diversity between the Giardia intestinalis species, we have performed genome sequencing and analysis of a wild-type Giardia intestinalis sample from the assemblage E group, isolated from a pig. Results We identified 5012 protein coding genes, the majority of which are conserved compared to the previously sequenced genomes of the WB and GS strains in terms of microsynteny and sequence identity. Despite this, there is an unexpectedly large number of chromosomal rearrangements and several smaller structural changes that are present in all chromosomes. Novel members of the VSP, NEK Kinase and HCMP gene families were identified, which may reveal possible mechanisms for host specificity and new avenues for antigenic variation. We used comparative genomics of the three diverse Giardia intestinalis isolates P15, GS and WB to define a core proteome for this species complex and to identify lineage-specific genes. Extensive analyses of polymorphisms in the core proteome of Giardia revealed differential rates of divergence among cellular processes. Conclusions Our results indicate that despite a well conserved core of genes there is significant genome variation between Giardia isolates, both in terms of gene content, gene polymorphisms, structural chromosomal variations and surface molecule repertoires. This study improves the annotation of the Giardia genomes and enables the identification of functionally important variation.
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| 7. |
- Abrahamson, Alexandra, et al.
(författare)
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Gill EROD in monitoring of CYP1A inducers in fish : A study in rainbow trout (Oncorhynchus mykiss) caged in Stockholm and Uppsala waters
- 2007
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Ingår i: Aquatic Toxicology. - : Elsevier BV. - 0166-445X .- 1879-1514. ; 85:1, s. 1-8
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Tidskriftsartikel (refereegranskat)abstract
- The gill filament 7-ethoxyresorufin O-deethylase (EROD) assay was evaluated as a monitoring tool for waterborne cytochrome P4501 A (CYP1A) inducers using rainbow trout (Oncorhynchus mykiss) caged in urban area waters in Sweden. To compare the CYP1A induction response in different tissues, EROD activity was also analyzed in liver and kidney microsomes. Immunohistochemistry was used to localize CYP1A protein in gill and kidney. In two separate experiments fish were caged at sites with fairly high expected polyaromatic hydrocarbon (PAH) contamination. In the first experiment, gill EROD activities were analyzed in fish exposed for 1-21 days in a river running through Uppsala. The reference site was upstream of Uppsala. In the second, gill, liver and kidney EROD activities were analyzed in fish exposed for 1-5 days in fresh or brackish waters of Stockholm and in a reference lake 60 km north of Stockholm. Fish exposed for 5 days followed by 2 days of recovery in tap water in the laboratory were also examined. The gill consistently showed a higher EROD induction compared with the liver and the kidney. After I day of caging, gill EROD activity was markedly induced (6-17-fold) at all sites examined. Induction in gill was pronounced (5-7-fold) also in fish caged at the reference sites. In the 21-day exposure study gill EROD activity remained highly induced throughout the experiment (26-fold at most) and the induced CYP1A protein was exclusively confined to the gill secondary lamellae. In the 5-day exposure experiment, EROD activity peaked after I day and then declined in both gill and liver, while CYP1A immunostaining in the gill remained intense over the 5-day period. In the kidney, CYP1A staining was weak or absent. We conclude that gill EROD activity is a more sensitive biomarker of exposure to waterborne CYP1A inducers than EROD activity in liver and kidney.
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| 8. |
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| 9. |
- Agertz, Oscar, et al.
(författare)
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Vintergatan - i. The origins of chemically, kinematically, and structurally distinct discs in a simulated milky way-mass galaxy
- 2021
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 503:4, s. 5826-5845
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Tidskriftsartikel (refereegranskat)abstract
- Spectroscopic surveys of the Milky Way's stars have revealed spatial, chemical, and kinematical structures that encode its history. In this work, we study their origins using a cosmological zoom simulation, VINTERGATAN, of a MilkyWay-mass disc galaxy. We find that in connection to the last major merger at z ∼ 1.5, cosmological accretion leads to the rapid formation of an outer, metal-poor, low-[α/Fe] gas disc around the inner, metal-rich galaxy containing the old high-[α/Fe] stars. This event leads to a bimodality in [α/Fe] over a range of [Fe/H]. A detailed analysis of how the galaxy evolves since z ∼ 1 is presented. We demonstrate the way in which inside-out growth shapes the radial surface density and metallicity profile and how radial migration preferentially relocates stars from the inner disc to the outer disc. Secular disc heating is found to give rise to increasing velocity dispersions and scale heights with stellar age, which together with disc flaring explains several trends observed in the MilkyWay, including shallower radial [Fe/H] profiles above the mid-plane.We show how the galaxy formation scenario imprints non-trivial mappings between structural associations (i.e. thick and thin discs), velocity dispersions, α-enhancements, and ages of stars; e.g. the most metal-poor stars in the low-[α/Fe] sequence are found to have a scale height comparable to old high-[α/Fe] stars. Finally, we illustrate how at low spatial resolution, comparable to the thickness of the galaxy, the proposed pathway to distinct sequences in [α/Fe]-[Fe/H] cannot be captured.
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| 10. |
- Andersson, Eric P., et al.
(författare)
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INFERNO : Galactic winds in dwarf galaxies with star-by-star simulations including runaway stars
- 2023
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 521:2, s. 2196-2214
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Tidskriftsartikel (refereegranskat)abstract
- The formation and evolution of galaxies have proved sensitive to the inclusion of stellar feedback, which is therefore crucial to any successful galaxy model. We present INFERNO, a new model for hydrodynamic simulations of galaxies, which incorporates resolved stellar objects with star-by-star calculations of when and where the injection of enriched material, momentum, and energy takes place. INFERNO treats early stellar kinematics to include phenomena such as walkaway and runaway stars. We employ this innovative model on simulations of a dwarf galaxy and demonstrate that our physically motivated stellar feedback model can drive vigorous galactic winds. This is quantified by mass and metal loading factors in the range of 10–100, and an energy loading factor close to unity. Outflows are established close to the disc, are highly multiphase, spanning almost 8 orders of magnitude in temperature, and with a clear dichotomy between mass ejected in cold, slow-moving (T ≲ 5 × 104 K, v < 100 km s-1) gas and energy ejected in hot, fast-moving (T > 106 K, v > 100 km s-1) gas. In contrast to massive disc galaxies, we find a surprisingly weak impact of the early stellar kinematics, with runaway stars having little to no effect on our results, despite exploding in diffuse gas outside the dense star-forming gas, as well as outside the galactic disc entirely. We demonstrate that this weak impact in dwarf galaxies stems from a combination of strong feedback and a porous interstellar medium, which obscure any unique signatures that runaway stars provide.
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| 11. |
- Andersson, Eric P., et al.
(författare)
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Pre-supernova feedback sets the star cluster mass function to a power law and reduces the cluster formation efficiency
- 2024
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Ingår i: Astronomy and Astrophysics. - 0004-6361. ; 681
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Tidskriftsartikel (refereegranskat)abstract
- Context. The star cluster initial mass function is observed to have an inverse power law exponent around 2, yet there is no consensus on what determines this distribution, and why some variation is observed in different galaxies. Furthermore, the cluster formation efficiency (CFE) covers a range of values, particularly when considering different environments. These clusters are often used to empirically constrain star formation and as fundamental units for stellar feedback models. Detailed galaxy models must therefore accurately capture the basic properties of observed clusters to be considered predictive. Aims. We study how feedback mechanisms acting on different timescales and with different energy budgets affect the star cluster mass function and CFE. Methods. We use hydrodynamical simulations of a dwarf galaxy as a laboratory to study star cluster formation. We test different combinations of stellar feedback mechanisms, including stellar winds, ionizing radiation, and supernovae (SNe). Results. Each feedback mechanism affects the CFE and cluster mass function. Increasing the feedback budget by combining the different types of feedback decreases the CFE by reducing the number of massive clusters. Ionizing radiation is found to be especially influential. This effect depends on the timing of feedback initiation, as shown by comparing early and late feedback. Early feedback occurs from ionizing radiation and stellar winds with onset immediately after a massive star is formed. Late feedback occurs when energy injection only starts after the main-sequence lifetime of the most massive SN progenitor, a timing that is further influenced by the choice of the most massive SN progenitor. Late feedback alone results in a broad, flat mass function, approaching a log-normal shape in the complete absence of feedback. Early feedback, on the other hand, produces a power-law cluster mass function with lower CFE, albeit with a steeper slope than that usually observed.
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| 12. |
- Andersson, Eric P., et al.
(författare)
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Runaway stars masquerading as star formation in galactic outskirts
- 2021
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Ingår i: Monthly Notices of the Royal Astronomical Society: Letters. - : Oxford University Press (OUP). - 1745-3925 .- 1745-3933. ; 502:1, s. 29-34
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Tidskriftsartikel (refereegranskat)abstract
- In the outskirts of nearby spiral galaxies, star formation is observed in extremely low gas surface densities. Star formation in these regions, where the interstellar medium is dominated by diffuse atomic hydrogen, is difficult to explain with classic star formation theories. In this letter, we introduce runaway stars as an explanation for this observation. Runaway stars, produced by collisional dynamics in young stellar clusters, can travel kiloparsecs during their main-sequence lifetime. Using galactic-scale hydrodynamic simulations including a treatment of individual stars, we demonstrate that this mechanism enables the ejection of young massive stars into environments where the gas is not dense enough to trigger star formation. This results in the appearance of star formation in regions where it ought to be impossible. We conclude that runaway stars are a contributing, if not dominant, factor to the observations of star formation in the outskirts of spiral galaxies.
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| 13. |
- Andersson Granberg, Tobias, 1973-, et al.
(författare)
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Sensor Requirements for Logistics Analysis of Emergency Incident Sites
- 2020
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Ingår i: Proceedings of the 17th ISCRAM Conference. - : Information Systems for Crisis Response and Management. - 9781949373271 ; , s. 952-960
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Konferensbidrag (refereegranskat)abstract
- Using sensors to collect data at emergency incident sites can facilitate analysis of the logistic operations. This can be used to improve planning and preparedness for new operations. Furthermore, real-time information from the sensors can serve as operational decision support. In this work in progress, we investigate the requirements on the sensors, and on the sensor data, to facilitate such an analysis. Through observations of exercises, the potential of using sensors for data collection is explored, and the requirements are considered. The results show that the potential benefits are significant, especially for tracking patients, and understanding the interaction between the response actors. However, the sensors need to be quite advanced in order to capture the necessary data.
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| 14. |
- Andersson, J. Y., et al.
(författare)
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Quantum structure based infrared detector research and development within Acreo's centre of excellence IMAGIC
- 2010
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Ingår i: Infrared physics & technology. - : Elsevier BV. - 1350-4495 .- 1879-0275. ; 53:4, s. 227-230
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Tidskriftsartikel (refereegranskat)abstract
- Acreo has a long tradition of working with quantum structure based infrared (IR) detectors and arrays. This includes QWIP (quantum well infrared photodetector), QDIP (quantum dot infrared photodetector), and InAs/GaInSb based photon detectors of different structure and composition. It also covers R&D on uncooled microbolometers. The integrated thermistor material of such detectors is advantageously based on quantum structures that are optimised for high temperature coefficient and low noise. Especially the SiGe material system is preferred due to the compatibility with silicon technology. The R&D work on IR detectors is a prominent part of Acreo's centre of excellence "IMAGIC" on imaging detectors and systems for non-visible wavelengths. IMAGIC is a collaboration between Acreo, several industry partners and universities like the Royal Institute of Technology (KTH) and Linkoping University. (C) 2010 Elsevier B.V. All rights reserved.
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| 15. |
- Andersson, Magnus, et al.
(författare)
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A structural basis for sustained bacterial adhesion : Biomechanical properties of CFA/I Pili
- 2012
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Ingår i: Journal of Molecular Biology. - : Elsevier. - 0022-2836 .- 1089-8638. ; 415:5, s. 918-928
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Tidskriftsartikel (refereegranskat)abstract
- Enterotoxigenic Escherichia coli (ETEC) are a major cause of diarrheal disease worldwide. Adhesion pili (or fimbriae), such as the CFA/I (colonization factor antigen I) organelles that enable ETEC to attach efficiently to the host intestinal tract epithelium, are critical virulence factors for initiation of infection. We characterized at single organelle level the intrinsic biomechanical properties and kinetics of individual CFA/I pili, demonstrating that weak external forces (7.5 pN) are sufficient to unwind the intact helical filament of this prototypical ETEC pilus and that it quickly regains its original structure when the force is removed. While the general relationship between exertion of force and an increase in the filament length for CFA/I pili associated with diarrheal disease is analogous to that of P-pili and type 1 pili, associated with urinary tract and other infections, the biomechanical properties of these different pili differ in key quantitative details. Unique features of CFA/I pili, including the significantly lower force required for unwinding, the higher extension speed at which the pili enter a dynamic range of unwinding, and the appearance of sudden force drops during unwinding can be attributed to morphological features of CFA/I pili including weak layer-to-layer interactions between subunits on adjacent turns of the helix, and the approximately horizontal orientation of pilin subunits with respect to the filament axis. Our results indicate that ETEC CFA/I pili are flexible organelles optimized to withstand harsh motion without breaking, resulting in continued attachment to the intestinal epithelium by the pathogenic bacteria that express these pili.
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| 16. |
- Andersson, Magnus, et al.
(författare)
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Differentiating pili expressed by enterotoxigenic and uropathogenic escherichia coli with optical tweezers
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Enterotoxigenic Escherichia coli (ETEC) attach to the host epithelium in the intestinal tract via specific adhesion organelles expressed on the cell membrane. We investigate, by force measuring optical tweezers, the intrinsic biomechanical properties and kinetics of the colonization factor I (CFA/I) at a single pilus level. The measurements indicate that CFA/I pili are helix-like structures that can both be unraveled to a linearized polymer by applying a small external force, 7.5 ± 1.5 pN but also regain its helix-like structure when the applied force is reduced. The data confirm that layer-to-layer interactions, that stabilize the helix-like structure, are much weaker than the interactions found in pili expressed by Uropathogenic Escherichia coli (UPEC). It is also found, contrary to previous results assessed from UPEC pili, that the CFA/I undergo in some cases a sudden structural change, a force drop of ~2 pN, when unraveled from the helix-like configuration to an open helical linearized fiber. These data suggest a rotation of the filament about its helical axis, followed by a region in which the force required to extend the pili further increases rapidly. During this final elongation to a super-extended fiber, CFA/I pili do not show any structural transition as seen for UPEC pili. In addition, the CFA/I pili show faster kinetics than UPEC pili that allows for a larger dynamic regime of in vivo shear forces. The unfolding and refolding possibility points toward an organelle that has evolved to allow for dynamic damping of external forces and handling of harsh motion without breaking.
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| 17. |
- Andersson, M., et al.
(författare)
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Evaluation of response in patients with hepatocellular carcinoma treated with intratumoral dendritic cell vaccination using intravoxel incoherent motion (IVIM) MRI and histogram analysis
- 2023
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Ingår i: Acta Radiologica. - : SAGE Publications. - 0284-1851 .- 1600-0455. ; 64:1, s. 32-41
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Tidskriftsartikel (refereegranskat)abstract
- Background Immunotherapy of hepatocellular carcinoma (HCC) is an emerging method with promising results. Immunotherapy can have an antitumor effect without affecting tumor size, calling for functional imaging methods for response evaluation. Purpose To evaluate the response to intratumoral injections with the immune primer ilixadencel in HCCs with diffusion-weighted magnetic resonance imaging (DW-MRI) using intravoxel incoherent motion (IVIM) and histogram analysis. Material and Methods A total of 17 patients with advanced HCC were treated with intratumoral injections with ilixadencel on three occasions 2-5 weeks apart. The patients were examined with IVIM before each injection as well as approximately three months after the first injection. Results The 10th percentile of perfusion-related parameter D* decreased significantly after the first and second intratumoral injections of ilixadencel compared to baseline (P < 0.05). There was a non-significant trend of lower median region of interest f (perfusion fraction) before injection 2 compared to baseline (P = 0.07). There were significant correlations between the 10th percentile and median of D at baseline and change in tumor size after three months (r = 0.79, P < 0.01 and r = 0.72, P < 0.05, respectively). Conclusion DW-MRI with IVIM and histogram analysis revealed significant reductions of D* early after treatment as well as an association between D at baseline and smaller tumor growth at three months. The lower percentiles (10th and 50th) were found more important. Further research is needed to confirm our preliminary findings of reduced perfusion after ilixadencel vaccinations, suggesting a treatment effect on HCC.
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| 18. |
- Andersson, Märta, et al.
(författare)
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Mycobacterium bovis bacilli Calmette-Guerin regulates leukocyte recruitment by modulating alveolar inflammatory responses.
- 2012
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Ingår i: Innate Immunity. - : SAGE Publications. - 1753-4267 .- 1753-4259. ; 18, s. 531-540
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Tidskriftsartikel (refereegranskat)abstract
- Leukocyte migration into the epithelial compartment is an important feature in the active phase of mycobacterial infections. In this study, we used the Transwell model to investigate the mechanisms behind mycobacteria-induced leukocyte recruitment and investigated the role of TLR2 and TLR4 in this process. Infection of epithelial cells resulted in significantly increased secretion of the neutrophil chemotactic CXCL8 and IL-6, but no secretion of monocyte chemotactic CCL2 or TNF-α was observed. In contrast to epithelial response, mycobacteria-infected neutrophils and monocytes secreted all these cytokines. Corresponding with epithelial cytokine response, mycobacterial infection of the epithelial cells increased neutrophil diapedesis, but decreased monocyte recruitment. However, monocyte recruitment towards mycobacteria infected epithelial cells significantly increased following addition of neutrophil pre-conditioned medium. Mycobacterial infection also increases alveolar epithelial expression of TLR2, but not TLR4, as analyzed by flow cytometry, Western blotting and visualized by confocal microscopy. Blocking of TLR2 inhibited neutrophil recruitment and cytokine secretion, while blocking of TLR4 had a lesser effect. To summarize, we found that primary alveolar epithelial cells produced a selective TLR2-dependent cytokine secretion upon mycobacterial infection. Furthermore, we found that cooperation between cells of the innate immunity is required in mounting proper antimicrobial defence.
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| 19. |
- Andersson, Niklas, 1975-
(författare)
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Design of Integrated Building Blocks for the Digital/Analog Interface
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The integrated circuit has, since it was invented in the late 1950's, undergone a tremendous development and is today found in virtually all electric equipment. The small feature size and low production cost have made it possible to implement electronics in everyday objects ranging from computers and mobile phones to smart prize tags. Integrated circuits are typically used for data communication, signal processing and data storage. Data is usually stored in digital format but signal processing can be performed both in the digital and in the analog domain. For best performance, the right partition of signal processing between the analog and digital domain must be used. This is made possible by data converters converting data between the domains. A device converting an analog signal into a digital representation is called an analog-to-digital converter (ADC) and a device converting digital data into an analog representation is called a digital-to-analog converter (DAC). In this work we present research results on these data converters and the results are compiled in three different categories. The first contribution is an error correction technique for DACs called dynamic element matching, the second contribution is a power efficient time-to-digital converter architecture and the third is a design methodology for frequency synthesis using digital oscillators.The accuracy of a data converter, i.e., how accurate data is converted, is often limited by manufacturing errors. One type of error is the so-called matching error and in this work we investigate an error correction technique for DACs called dynamic element matching (DEM). If distortion is limiting the performance of a DAC, the DEM technique increases the accuracy of the DAC by transforming the matching error from being signal dependent, which results in distortion, to become signal independent noise. This noise can then be spectrally shaped or filtered out and hereby increasing the overall resolution of the system. The DEM technique is investigated theoretically and the theory is supported by measurement results from an implemented 14-bit DAC using DEM. From the investigation it is concluded that DEM increases the performance of the DAC when matching errors are dominating but has less effect at conversion speeds when dynamic errors dominate.The next contribution is a new time-to-digital converter (TDC) architecture. A TDC is effectively an ADC converting a time difference into a digital representation. The proposed architecture allows for smaller and more power efficient data conversion than previously reported and the implemented TDC prototype is smaller and more power efficient as compared to previously published TDCs in the same performance segment.The third contribution is a design methodology for frequency synthesis using digital oscillators. Digital oscillators generate a sinusoidal output using recursive algorithms. We show that the performance of digital oscillators, in terms of amplitude and frequency stability, to a large extent depends on the start conditions of the oscillators. Further we show that by selecting the proper start condition an oscillator can be forced to repeat the same output sequence over and over again, hence we have a locked oscillator. If the oscillator is locked there is no drift in amplitude or frequency which are common problems for recursive oscillators not using this approach. To find the optimal start conditions a search algorithm has been developed which has been thoroughly tested in simulations. The digital oscillator output is used for test signal generation for a DAC or used to generate tones with high spectral purity using DACs.
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| 20. |
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| 21. |
- Andersson, Oscar
(författare)
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Chicagoskolan : Institutionaliseringen, idétraditionen och vetenskapen
- 2003
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The main purpose of my thesis is to investigate how the Chicago School in urban sociology, that was active between 1915 and 1935, developed and why it produced so many classical monographs during a period of about ten to fifteen years. To outline the historical reasons for the School to develop I have chosen to view the historical context as a field with different actors. Another related and overall question in the thesis is how an academic institution goes from being a rather loosely integrated administrative organisation with diverse ideas and areas of interest to become a full-fledged scientific institution with a relatively homogenous subject and field of research. In chapter 1, I deal explicitly with how the Department of Sociology and Anthropology at the University of Chicago became institutionalized between 1892 and 1914. One of the reasons why it is relevant to investigate how this department developed is that it was during this period that the institutional and economical foundation was laid for the later establishment of the Chicago School in the 1920’s. In chapter 2 I examine how different traditions of ideas influenced the members of the Chicago School. However, I do not give a complete outline of these different traditions, presenting only the main outlines and showing how they influenced the School’s thoughts about social groups, individuals, societies and the social sciences. In chapter 3 I outline the urban and human ecological research project of the Chicago School between 1915 and 1935. In order to understand the development of the Department of Sociology and Anthropology in Chicago between 1892 and 1935 as a historical field with different actors and for what it takes for an institution to develop into a scientific discipline it is essential to analyze this project. In chapter 4 I present the scientific point of view, ethnographic methods, and epistemology of the Chicago School and also discuss what importance the School and anthropology had for one another in Chicago and the United States. I focus above all on W. I. Thomas’ scientific point of view and approach to method, because it was he who laid the foundation of epistemology, method and scientific field of the Chicago School. I have chosen to regard my empirical study as to form a historical field with actors who in one way or another contributed to the creation of the Chicago School between 1915 and 1935. My empirical study of how the School developed shows that it takes both an administrative and financial foundation as well as traditions of ideas and creative researchers for an academic institution to develop into a scientific discipline.
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| 22. |
- Andersson, Oscar, 1968-
(författare)
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Chicagoskolans urbansociologi : forskare och idéer 1892–1965
- 2007
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Bok (refereegranskat)abstract
- Oscar Andersson placerar sin undersökning mitt i staden och ger stort utrymme åt de institutionella frågorna. Han diskuterar hur Chicagoskolan idag betraktas, vilka idéer den byggde på och naturligtvis den forskning som främst förknippas med skolans namn. Så diskuterar han ingående den urbansociologiska forskning som bedrevs vid skolans höjdpunkt kring 1920-talet, men också dess vetenskapssyn mer allmänt, från teorier och begrepp till metod. Det var vid Chicagoinstitutionen som den självuppfyllande profetian, attityder och livshistorier på allvar begreppsliggjordes. Oscar Andersson stannar inte vid de berömda monografierna utan behandlar också det som i sociologin med tiden blev känt som den symboliska interaktionismen. Därmed blir också W.I. Thomas till en av skolans förgrundsgestalter, tillsammans med Robert E. Park och Ernest W. Burgess. Andersson lägger också ut trådarna framåt från det framgångsrika 1920-talet för både sociologins och socialantropologins vidkommande.Boken vänder sig inte bara till alla dem som på senare år med växande intresse har intresserat sig för de urbana frågorna – särskilt det mångfacetterade livet i städerna. Också de med intresse för sociologins historia och ämnets förhållande till på olika sätt närliggande discipliner, såsom etnologi, antropologi och socialt arbete, kan finna en hel del användbara observationer och tankar i boken, liksom de med ett intresse för samhällsforskningens historiska villkor mer allmänt.
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| 23. |
- Andersson, Oscar
(författare)
-
Chicagoskolans urbansociologi : forskare och idéer 1892–1962
- 2007
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Syftet med denna bok är att placera in forskarna vid den sociologiska institutionen i Chicago 1892–1965 och deras idéer i sitt historiska sammanhang. Boken redogör för såväl hur institutionen konstituerades och utvecklades till Chicagoskolan mellan 1915–1935 som vilka idéströmningar som i huvudsak influerade och utvecklades av William I. Thomas, Robert E. Park och Ernest W. Burgess. Vidare visar boken på de numera klassiska stadsdelsstudierna The Hobo (1923), The Gang (1927), The Ghetto (1928) och The Gold Coast and the Slum (1929) placering i ett övergripande urbant ramverk, idéinfluenserna mellan sociologi och antropologi samt Howard S. Beckers, Erving Goffmans och William F. Whytes plats i Chicagotraditionen.
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| 24. |
- Andersson, Oscar, 1968-
(författare)
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Digital process planning of joining by numerical models in the automotive industry
- 2017
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The automotive industry is striving towards reduction of greenhouse gas emission by reducing product weight and improving fuel efficiency of their products. The introduction of lightweight materials have imposed greater pressure not only on the product development but also on manufacturing systems. One integral aspect of manufacturing systems, which is meeting these challenges is joining technology. In order to achieve successful joining of new automotive products, joining process planning must be equally successful.This research aims at improving process planning of joining by introducing digital tools into the process planning work method. The digital tools are designed to reduce lead times and increase accuracy of the process planning to realize more advanced, complex and environmentally friendly product solutions in the vehicles of the future.The research has two main focuses. Firstly, the joining process planning structure and organization have been analysed. The analysis has identified specific instances where digital tools can be introduced to improve the process planning and make it more efficient. Digital tools, such as numerical models for prediction and databases for re-use of knowledge, have been suggested for the process planning. An assessment of the impact of the introduction of these tools in an industrial test case has been performed to show the possible reduction in lead times.Secondly, geometrical distortions due to laser beam welding have been investigated, both by experimental trials and numerical modelling. The influences of design and process parameters on the distribution and magnitude of geometrical distortions have been established. Numerical models of different modelling detail and complexity have been developed and evaluated in order to find modelling approaches with reduced computation times aimed at industrial implementation. The predictive accuracy and computational efficiency of the numerical models have been assessed and evaluated with regard to industrial implementation.
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| 25. |
- Andersson, Oscar, et al.
(författare)
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Digitalization of Process Planning of Spot Welding in Body-in-white
- 2016
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Ingår i: Procedia CIRP. - : Elsevier B.V.. - 2212-8271. ; , s. 618-623
-
Konferensbidrag (refereegranskat)abstract
- Process planning of spot welding for body-in-white automobile structures involves several experimental (physical) welding trials to set the process parameters. These experimental trials are crucial in ensuring the quality and efficiency of the process. However, due to the iterative nature of the work, running several experiments is costly and time consuming prolonging the overall development cost and time significantly. To minimize the cost and time, replacing the physical tests by digital (virtual) tests is an established approach although not often applied for spot welding. However, for a long chain of development process with several iterative loops, this is not a trivial task considering the availability of information and continuity of the work flow. This paper reports the work and results of an industrial case study conducted on spot welding of a body-in-white car pillar in a Swedish auto manufacturer. The aim of the study is to investigate and propose the necessary conditions required to replace a physical test by virtual tests in terms of validity and expedited execution of the process. Information sharing, knowledge reuse and streamlining the work flow have found to be critical condition for valid and rapid virtual tests. © 2016 The Authors.
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| 26. |
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| 27. |
- Andersson, Oscar, et al.
(författare)
-
Experimental measurements and numerical simulations of distortions of overlap laser-welded thin sheet steel beam structures
- 2017
-
Ingår i: Welding in the World. - : Springer Science and Business Media LLC. - 0043-2288 .- 1878-6669. ; 61:5, s. 927-934
-
Tidskriftsartikel (refereegranskat)abstract
- Distortions of mild steel structures caused by laser welding were analyzed. One thousand-millimeter U-beam structures were welded as overlap joints with different process parameters and thickness configurations. Final vertical and transverse distortions after cooling were measured along the U-beam. Significant factors, which affect distortions, were identified. Heat input per unit length, weld length, and sheet thickness showed a significant effect on welding distortions. Furthermore, the welding distortions were modeled using FE simulations. A simplified and computationally efficient simulation method was used. It describes the effect of shrinkage of the weld zone during cooling. The simulations show reasonable computation times and good agreement with experiments.
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| 28. |
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| 29. |
- Andersson, Oscar, et al.
(författare)
-
Experiments and efficient simulations of distortions of laser beam–welded thin-sheet close beam steel structures
- 2019
-
Ingår i: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture. - : SAGE Publications. - 0954-4054 .- 2041-2975. ; 233:3, s. 787-796
-
Tidskriftsartikel (refereegranskat)abstract
- In this article, geometrical distortions of steel structures due to laser beam welding were analyzed. Two 700-mm-long U-beam structures were welded in overlap configurations: a double U-beam structure and a U-beam/flat structure. The structures were in different material combinations from mild steel to ultrahigh-strength steel welded with different process parameters. Different measures of distortions of the U-beam structures were evaluated after cooling. Significant factors of the welding process and the geometry of the structures were identified. Furthermore, welding distortions were modeled using two predictive finite element simulation models. The previously known shrinkage method and a newly developed time-efficient simulation method were evaluated. The new model describes the effects of expansion and shrinkage of the weld zone during welding and material plasticity at elevated temperatures. The new simulation method has reasonable computation times for industrial applications and improved agreement with experiments compared to the often used so-called shrinkage method.
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| 30. |
- Andersson, Oscar, 1968-
(författare)
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Följeforskningsprocessen
- 2015. - 1
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Ingår i: Social mobilisering. - Malmö : Universus Press. - 9789187439254 ; , s. 221-259
-
Bokkapitel (refereegranskat)
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| 31. |
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| 32. |
- Andersson, Oscar, 1968-
(författare)
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Hållplats 8 : en social intervention för unga kriminella i stadsdelen Rosengård, Malmö stad
- 2009
-
Rapport (refereegranskat)abstract
- Oscar Andersson redogör i denna rapport om öppenvårdsprogrammet Hållplats 8 på ett ingående sätt hur individ- och familjeomsorgen i stadsdelen Rosengård försöker förebygga och motverka att ungdomsbrottsligheten blir etablerad i stadsdelen. Det är dock ännu allt för tidigt att dra några långtgående slutsatser om hur väl öppenvårdsprogrammet har lyckats med denna grannlaga uppgift sedan starten i januari 2005. Samtidigt finns det tendenser som tyder på att ungdomar som har varit inskrivna vid Hållplats 8 har påbörjat en livsstilsförändring. Från att tidigare ha varit ungdomar som enbart varit upptagna med att umgås med sina kriminella kamrater börjar de successivt efter inskrivningen att allt mer tänka på hur deras normbrytande beteende påverkar deras familj och framtidsutsikter. Oscar Andersson lyfter även fram frågor som går bortom interventionens omedelbara inverkan på ungdomarnas kriminella beteende och tänkande. Han pekar bl.a. på betydelsen av att placera in socialtjänstens insatser i ett övergripande socialpolitiskt sammanhang, där grundläggande välfärdsfrågor om fritid, skola, sysselsättning och trångboddhet diskuteras. Centrala teman i rapporten är interventioner för kriminella barn och ungdomar, förhållandet mellan sluten- och öppenvård, socialt nätverksarbete, evidensbaserad praktik, manualbaserade metoder, verksamhetsutveckling och inte minst ungdomarnas egna berättelser.
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| 33. |
- Andersson, Oscar
(författare)
-
Hållplats 8. En social intervention för unga kriminella i stadsdelen Rosengård, Malmö stad
- 2009
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Oscar Andersson redogör i denna rapport om öppenvårdsprogrammet Hållplats 8 på ett ingående sätt hur individ- och familjeomsorgen i stadsdelen Rosengård försöker förebygga och motverka att ungdomsbrottsligheten blir etablerad i stadsdelen. Det är dock ännu allt för tidigt att dra några långtgående slutsatser om hur väl öppenvårdsprogrammet har lyckats med denna grannlaga uppgift sedan starten i januari 2005. Samtidigt finns det tendenser som tyder på att ungdomar som har varit inskrivna vid Hållplats 8 har påbörjat en livsstilsförändring. Från att tidigare ha varit ungdomar som enbart varit upptagna med att umgås med sina kriminella kamrater börjar de successivt efter inskrivningen att allt mer tänka på hur deras normbrytande beteende påverkar deras familj och framtidsutsikter. Oscar Andersson lyfter även fram frågor som går bortom interventionens omedelbara inverkan på ungdomarnas kriminella beteende och tänkande. Han pekar bl.a. på betydelsen av att placera in socialtjänstens insatser i ett övergripande socialpolitiskt sammanhang, där grundläggande välfärdsfrågor om fritid, skola, sysselsättning och trångboddhet diskuteras. Centrala teman i rapporten är interventioner för kriminella barn och ungdomar, förhållandet mellan sluten- och öppenvård, socialt nätverksarbete, evidensbaserad praktik, manualbaserade metoder, verksamhetsutveckling och inte minst ungdomarnas egna berättelser.
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| 34. |
- Andersson, Oscar, 1968-
(författare)
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Italiensk-amerikaner i Bostons North End : En omanalys av William Foote Whytes fältanteckningar
- 2022. - 1
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Bok (refereegranskat)abstract
- I sin nya bok gör Oscar Andersson en omanalys av William Foote Whytes fältanteckningar från hans klassiska fältstudie Street Corner Society från 1943, som utspelar sig i Bostons stadsdel North End under andra hälften av 1930-talet. Att få tillgång till en annan antropologs kompletta samling fältanteckningar är unikt. Antropologer ser fältanteckningar som sin intellektuella egendom och det finns ingen utomstående som kan kräva att få se dem. Forskning har visat att antropologer oroar sig över att fältanteckningarna – vid en jämförande analys – inte validerar etnografin, vilket gör att de ogärna lämnar ut dem. Bill Whyte var tvärtom en tillitsfull person som såg det som en självklarhet att efterkommande forskargenerationer skulle få tillgång till hans ocensurerade fältanteckningar. Whytes oredigerade fältanteckningar och banbrytande observationsmetoder analyseras ingående i denna studie av Oscar Andersson. Bill Whytes fältanteckningar har använts analytiskt för att historiskt beskriva och teoretiskt förklara italiensk-amerikaners kultur i Bostons North End i teman som både överlappar och skiljer sig från Whytes. Dessa teman binds samman av rumsliga och temporala grupphändelser, och innefattar den stora depressionen under 1930-talet, emigrationen från Italien till USA, stadsdelen North Ends befolkningsutveckling, lokalpolitik, organiserad brottslighet, arbetsmarknadskonflikter, social rörlighet och gruppkonflikter som kunde blossa upp i det gäng av cornerboys, som Bill Whyte umgicks med i North End. En händelse som också ingående återberättas är mobiliseringen av invånarna för att protestera mot stadsdelens sanitära och hygieniska missförhållanden som befolkningen tvingades leva under.
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| 35. |
- Andersson, Oscar, 1968-
(författare)
-
Nels Anderson : mannen i marginalen
- 2011
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Ingår i: Sosiologi i dag. - Oslo : Novus Forlag. - 0332-6330 .- 1893-4617. ; 41:2, s. 14-34
-
Tidskriftsartikel (refereegranskat)abstract
- Syftet med artikeln är att redogöra för hur Nels Andersons (1889–1986) kärva hobouppväxt hängde samman skapandet av hans klassiska studie Hobon: En sociologisk studie av den hemlöse mannen (2008 [1923]) och hans marginaliserade position inom den akademiska världen. Fokus ligger på Andersons uppväxt, studien Hobon och hans marginella position i samhället i relation till pionjärtiden i Chicagoskolan. Baserat på texter om och av Anderson och till viss del arkivdokument, binder artikeln samman olika delar från Andersons liv med Robert E. Parks och Everett V. Stonequists begrepp the marginal man. Andersons sociala arv som en kringresande arbetare gjorde å ena sidan att doktorandkollegor vid University of Chicago antog att han var lika opålitlig som de hemlösa männen han hade studerat, å andra sidan gjorde det honom särskilt lämpad att göra den studie som kanske mer än någon annan har blivit ansedd som en etnografisk klassiker i Chicagoskolans tradition.
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| 36. |
- Andersson, Oscar
(författare)
-
Nels Anderson : mannen i marginalen
- 2011
-
Ingår i: Sosiologi i dag. - : Novus Forlag. - 0332-6330 .- 1893-4617. ; 41:4, s. 14-34
-
Tidskriftsartikel (refereegranskat)abstract
- Syftet med artikeln är att redogöra för hur Nels Andersons (1889–1986) kärva hobouppväxt hängde samman skapandet av hans klassiska studie Hobon: En sociologisk studie av den hemlöse mannen (2008 [1923]) och hans marginaliserade position inom den akademiska världen. Fokus ligger på Andersons uppväxt, studien Hobon och hans marginella position i samhället i relation till pionjärtiden i Chicagoskolan. Baserat på texter om och av Anderson och till viss del arkivdokument, binder artikeln samman olika delar från Andersons liv med Robert E. Parks och Everett V. Stonequists begrepp the marginal man. Andersons sociala arv som en kringresande arbetare gjorde å ena sidan att doktorandkollegor vid University of Chicago antog att han var lika opålitlig som de hemlösa männen han hade studerat, å andra sidan gjorde det honom särskilt lämpad att göra den studie som kanske mer än någon annan har blivit ansedd som en etnografisk klassiker i Chicagoskolans tradition.
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| 37. |
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| 38. |
- Andersson, Oscar
(författare)
-
Nels Anderson (1889–1986) : en introduktion
- 2008
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Ingår i: Hobon. - : Égalité. - 9789197657716 ; , s. 13-47
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Nels Andersons bok The Hobo (1923) är en socio logisk klassiker. Med denna bok inledde Univer sity of Chicago sin sociologiska serie om grupper av människor, institu tio ner, livsstilar och stadsdelar i 1920- och 1930-talets Chicago. Nels Andersons studie handlar om den kringvandrande och tillfällighetsarbetande hemlöse man nen, hobon, om hans bakgrund och erfarenheter och om det strapatsfyllda livet i Chicagos Ho bohe mien. Anderson hade själv under många år levt som en hobo, och hade därför en unik inblick i den värld han beskriver. Det fi nns fl era skäl till varför boken fortfarande är aktuell. Ett är att Anderson på ett nästan oöver träff at sätt visar hur man genom deltagande observation kan fånga ett socialt fenomen inifrån. Läsaren förs på ett raffi nerat sätt in i hobons sociala värld med dess arbete, sjukdomar, språk, sånger, moral, äventyrliga resor och in tellektuella liv. Beskrivningar utifrån hobons subjektiva livshorisont ger lä sa ren insikt i en tillvaro och en kultur som är okända för de flesta som inte lever på gatan. Boken skild rar också en historisk brytningstid som innebar att pionjärtidens hobo blev överflödig.
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| 39. |
- Andersson, Oscar, et al.
(författare)
-
Prediction and verification of resistance spot welding results of ultra high strength steels through FE simulations
- 2015
-
Ingår i: Modeling and Numerical Simulation of Material Science. - : Scientific Research Publishing, Inc.. - 2164-5345 .- 2164-5353. ; 5, s. 26-37
-
Tidskriftsartikel (refereegranskat)abstract
- Resistance spot welding (RSW) is the most common welding method in automotive engineering due to its low cost and high ability of automation. However, physical weldability testing is costly, time consuming and dependent of supplies of material and equipment. Finite Element (FE) simulations have been utilized to understand, verify and optimize manufacturing processes more efficiently. The present work aims to verify the capability of FE models for the RSW process by comparing simulation results to physical experiments for materials used in automotive production, with yield strengths from approximately 280 MPa to more than 1500 MPa. Previous research has mainly focused on lower strength materials. The physical weld results were assessed using destructive testing and an analysis of expulsion limits was also carried out. Extensive new determination of material data was carried out. The material data analysis was based on physical testing of material specimens, material simulation and comparison to data from literature. The study showed good agreement between simulations and physical testing. The mean absolute error of weld nugget size was 0.68 mm and the mean absolute error of expulsion limit was 1.10 kA.
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| 40. |
- Andersson, Oscar
(författare)
-
Process planning of resistance spot welding
- 2013
-
Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Manufacturing engineering in general has experienced an increased demand of process planning in order to optimize processes to reduce costs, environmental impact and increase time efficiency. Resistance spot welding (RSW) is a common and large-scale joining method in several manufacturing industries indicating significant potentials of efficient process planning.The goal of this thesis is to establish new knowledge for updated and improved process planning of RSW in industrial applications. The goal is expressed by two research questions targeting the issues of process variations and potential of numerical methods of the RSW process. The research questions are expressed in terms of weld size, which is the main interest in RSW process planning.As any large-scale manufacturing process, RSW involves variations in results – the weld size is known to vary, both as a result of intentional dependent parameters such as process parameters and as a result of unintentional variations in welding conditions. A series of physical and numerical analysis have been performed in order to gain knowledge of such variations.The unintentional variations, which result in varying weld sizes in apparently identical conditions, were analyzed through both controlled laboratory welding and welding in industrial production environments. The results of the analysis showed the magnitude of standard deviations in both environments and the distribution of weld sizes. The analysis showed that common standard deviations in controlled laboratories and industrial production are approximately 0.3 mm and 0.9 mm, respectively and that weld sizes are distributed showed promising fit to both Normal and Weibull distributions.The intentional variations of weld sizes due to process parameters, which is the most important aspect of RSW process planning, have traditionally been analyzed through physical testing. In the present thesis two numerical methods were evaluated; regression analysis and FE simulations. For the regression analysis several models were generated and showed a standard deviation of residuals between model and physical results of 0.5 mm. For the FE simulations, material models for the RSW were generated and the simulations showed a standard deviation compared to physical testing of 0.68 mm. In conclusion, the present thesis presents results, which help quantify variations in weld sizes and present the capability of numerical methods of the RSW process.
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| 41. |
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| 42. |
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| 43. |
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| 44. |
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| 45. |
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| 46. |
- Andersson, Oscar, 1968-
(författare)
-
The Moral System of Corner boys and College boys in Boston’s North End During the Great Depression of the 1930s : A Reinterpretation of William Foote Whyte’s Street Corner Society Based on His Fieldnotes and an Unpublished Case Study
- 2021
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Ingår i: Journal of the North End Historical Society. - Boston : North End Historical Society. - 9780578831329 ; , s. 23-49
-
Bokkapitel (refereegranskat)abstract
- The article is about the attitudes of corner boys and college boys’ to social mobility, showing that the 1930s was a watershed era. The first generation of Italians were often farmers and fishermen who became industrial workers in the United States. The second generation of Italians had adapted to American cultural conditions to varying degrees, with commitments in both the local community and the majority society. Corner boys planned for a future in the local community. College boys strove to pursue a career outside the social and geographical boundaries of the community. Corner boys learned the rules of society on the street. College boys were handpicked at school and in the settlement house to become middle-class Americans. Corner boys regarded college boys as hypocrites who put their short-term interests before those of the local community. The schisms between corner boys and college boys were an indication that the family values of the local Italian community were changing. But it was not until some time after the Second World War that the third and fourth generations of Italians had acquired moral values similar to those of the average American about abortion, mixed marriages, homosexuality, sexual abstinence before marriage, and divorce.
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| 47. |
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| 48. |
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| 49. |
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| 50. |
- Andersson, Oscar, 1968-
(författare)
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William Foote Whyte, Street Corner Society and social organization
- 2014
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Ingår i: Journal of the History of the Behavioral Sciences. - : John Wiley & Sons. - 0022-5061 .- 1520-6696. ; 50:1, s. 79-103
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Tidskriftsartikel (refereegranskat)abstract
- Social scientists have mostly taken it for granted that William Foote Whyte’s sociological classic Street Corner Society (SCS, 1943) belongs to the Chicago school of sociology’s research tradition or that it is a relatively independent study which cannot be placed inany specific research tradition. Social science research has usually overlooked the fact that William Foote Whyte was educated in social anthropology at Harvard University, and was mainly influenced by Conrad M. Arensberg and W. Lloyd Warner. What I want to show, based on archival research, is that SCS cannot easily be said either to belong to the Chicago school’s urban sociology or to be an independent study in departmental and idea-historical terms. Instead, the work should be seen as part of A. R. Radcliffe-Brown’s and W. LloydWarner’s comparative research projects in social anthropology.
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