| 1. |
- Murphy, Kathleen, 1972, et al.
(författare)
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Non-methane volatile organic compounds predict odor emitted from five tunnel ventilated broiler sheds
- 2014
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Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 95, s. 423-432
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Tidskriftsartikel (refereegranskat)abstract
- Non-methane volatile organic compounds (NMVOCs) emitted from mechanically ventilated poultry sheds in similar stages (32-36d) of broiler production were measured by thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS), then identified using parallel factor analysis (PARAFAC2) and the NIST11 database. Calibration models predicting odor measured by dilution olfactometry from NMVOC concentrations via orthogonal projection to latent structures (O-PLS) made good predictions (Rp2=0.83-0.87, RMSEp=137-175OU) using one to eight NMVOCs with either one or two latent variables representing odor concentration and character, respectively. Similar changes in odorant composition were observed in each sampling campaign, with samples collected early in the day more odorous and more sulfurous than samples collected later in the day. High litter moisture favored sulfur-containing odorants over alcohols, aldehydes and ketones but had little bearing on perceived odor, whereas high bird density favored alcohols, aldehydes and ketones over sulfur-containing odorants. Eight VOCs that were important predictors of odor across all sheds in order of decreasing importance were dimethyl sulfide (DMS), dimethyl trisulfide (DMTS), 2-3 butanedione, 3-methyl-butanal, 1-butanol, 3-methyl-1-butanol, acetoin, and 2-butanone. Four additional NMVOCs also influenced perceived odor although less predictably; these were n-hexane, 2-butanol, dimethyl disulfide (DMDS), and 1-octen-3-ol. All of the odorants are associated with microbial or fungal activity in the litter and manure, except n-hexane, which may originate from hexane-extracted soybean meal in the chicken feed. The organosulfides measured in this study may have arisen from the field sites as well as from the degradation of thiols captured on sorbent tubes during analysis by TD-GC/MS. © 2013 Elsevier Ltd.
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| 2. |
- Tesfahuney, Mekonnen, et al.
(författare)
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Integrationism : Viljan till detsamma
- 2007
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Ingår i: Nordiskt samhällsgeografiskt tidksrift.
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Tidskriftsartikel (refereegranskat)abstract
- Artikel är en geofilosofisk kritik av grundföreställningar om integration och angränsande begrepp. Grundidén bygger på en likhetsontologi, det vi kallar viljan till detsamma/det lika. Denna grundidé genomsyrar i princip ALL samhällsvetenskaplig forskning.
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| 3. |
- Do, Minh Quang, 1969
(författare)
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Towards a Power and Performance Simulation Framework for Parallel DSP Architecture
- 2005
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- High performance, low power and low cost will continue to be driving factors for digital signal processor (DSP) and embedded computer systems of the future. Recent improvements of semiconductor technology have led to faster circuits, higher density, and smaller dimensions. However, along with technology scaling there are still many difficult challenges for future electronic and computer system design, one of them is power consumption. There is a lot of research efforts dedicated for reducing both dynamic and static power consumption in all the designlevels ranging from the circuit-level to the architecture-level and the algorithm-level. In all these levels performance-power simulation/estimation tools play a very important, even decisive role. This thesis describes in detail our ongoing research work on designing and im-plementing an architecture-level cycle-accurate power-performance simulator for parallel DSP architectures (DSP-PP). The DSP-PP uses the suggested White-box Table-based Total Power Consumption (WTTPC) estimation approach offering both rapid and accurate architectural level power estimation models for proces-sorcomponents with regular structures (such as SRAM arrays) based on tables of power values. This approach offers relatively simple high-accuracy architecture-levelpower estimation models accounting for both dynamic and static power consumption. The DSP-PP simulator, implemented using C++ and SystemC libraries, simulatesan extended version of the ManArray parallel DSP architecture. DSP-PP produces performance data (i.e. number of clock cycles) and power estimateswhile running executable programs. By varying the configuration of the architecture, the user can rapidly explore the power and performance design space.
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| 4. |
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| 5. |
- Sartoretto, Paola
(författare)
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The Circumstantial Media Activist : An Analysis of the Relation between Media and Political Representation
- 2016
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Ingår i: Javnost - The Public. - : Informa UK Limited. - 1318-3222 .- 1854-8377. ; 23:3, s. 273-289
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Tidskriftsartikel (refereegranskat)abstract
- Alternative or radical media are kinds of media production common among social movements whose members do not see their causes represented in mainstream media. This is the case of the Brazilian Landless Workers Movement (MST), which since 1984 has created media outlets and produced content for different platforms, later becoming active in the area of media and communication rights in Brazil. Based on fieldwork carried out in 2013 and 2014, this article proposes that a perspective of communication rights is attentive to the structural configuration of the media landscape and not only to the provision of technology and production skills. This study shows that collective action and promotion of structural change are still relevant alongside new technologies.
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| 6. |
- Lankhaar, Boy, 1991, et al.
(författare)
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Hyperfine interactions and internal rotation in methanol
- 2016
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 145:24, s. 244301-
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Tidskriftsartikel (refereegranskat)abstract
- We present a rigorous derivation of the nuclear spin-rotation and spin-torsion coupling terms in the hyperfine Hamiltonian for molecules with internal rotation. Our formulas differ from the expressions derived by Heuvel and Dymanus [J. Mol. Spectrosc. 47, 363 (1973)], which these authors used and which were also applied recently by others to interpret experimental hyperfine spectra of such molecules. In the present work, our theoretical results are applied to methanol. We calculate the nuclear spin-spin magnetic dipole-dipole interactions and the nuclear contribution to the spin-torsion coupling vectors from the nuclear coordinates as functions of the internal rotation angle γ, compute the spin-rotation coupling tensors by ab initio electronic structure methods also as functions of γ, and obtain the missing parameters for the electronic contribution to the spin-torsion coupling from a fit to measured spectra. The resulting hyperfine Hamiltonian is then used to compute hyperfine transition frequencies and intensities for twelve torsion-rotation transitions in methanol. With the use of the ab initio calculated spin-rotation coupling parameters without any modification, and physically reasonable values for the spin-torsion coupling parameters from the fit, we find good agreement with all of the measured spectra.
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| 7. |
- Sawkar-Mathur, Monica, et al.
(författare)
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The effect of aluminum oxide incorporation on the material and electrical properties of hafnium oxide on Ge
- 2008
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 93:23, s. 233501-
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Tidskriftsartikel (refereegranskat)abstract
- Hafnium aluminate thin films were synthesized by atomic layer deposition (ALD) to assess the effect of aluminum oxide incorporation on the dielectric/Ge interfacial properties. In these HfxAlyOz thin films, the Hf to Al cation ratio was effectively controlled by changing the ratio of hafnium oxide to aluminum oxide ALD cycles, while their short range order was changed upon increasing aluminum oxide incorporation, as observed by extended x-ray absorption fine structure analysis. The incorporation of aluminum oxide was shown to improve the electrical characteristics of hafnium oxide/Ge devices, including lower interface state densities and leakage current densities.
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| 8. |
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| 9. |
- Assefa, T. A., et al.
(författare)
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The fluctuation–dissipation measurement instrument at the Linac Coherent Light Source
- 2022
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Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 1089-7623 .- 0034-6748. ; 93
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Tidskriftsartikel (refereegranskat)abstract
- The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have constructed a pair of advanced instruments to conduct studies targeting quantum materials. We first describe a prototype instrument built to test the proof-of-principle of resonant magnetic scattering using ultrafast pulse pairs. This is followed by a description of a new endstation, the so-called fluctuation–dissipation measurement instrument, which was used to carry out studies with a fast area detector. In addition, we describe various types of diagnostics for single-shot contrast measurements, which can be used to normalize data on a pulse-by-pulse basis and calibrate pulse amplitude ratios, both of which are important for the study of fluctuations in materials. Furthermore, we present some new results using the instrument that demonstrates access to higher momentum resolution.
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| 10. |
- Ganesalingam, Jeban, et al.
(författare)
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pNfH is a promising biomarker for ALS
- 2013
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Ingår i: Amytrophic Lateral Sclerosis and Frontotemporal degeneration. - : Informa Healthcare. - 2167-8421 .- 2167-9223. ; 14:2, s. 146-149
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Tidskriftsartikel (refereegranskat)abstract
- A diagnostic biomarker for ALS would permit early intervention with disease-modifying therapies while a biomarker for disease activity could accelerate the pace of drug discovery by facilitating shorter, and less costly, drug trials to be conducted with a smaller number of patients. Neurofilaments are the most abundant neuronal cytoskeletal protein. We set out to determine whether pNfH was a credible biomarker for ALS. pNfH levels were determined using an ELISA for 150 ALS subjects and 140 controls. We demonstrated a seven-fold elevation in the cerebrospinal fluid (CSF) levels of phosphorylated neurofilament heavy subunit (pNfH) in ALS (median n = 2787 pg/ml, n = 150), compared to headache and other benign controls (3 (4 pg/ml, n = 100, p = < 0.05). There was a 10-fold elevation of pNfH compared to ALS mimics (266 pg/ml, n = 20) and other neurodegenerative and inflammatory conditions (27 (pg/ml for n = 20) which was also highly significant (p = < 0.05). pNfH achieved a diagnostic sensitivity of 90% and specificity of 87% in distinguishing ALS from all controls. We also detected an inverse correlation between CSF pNfH levels and disease duration (time from symptom onset to death, r(2) = 0.1247, p = 0.001). In conclusion, pNfH represents a promising candidate for inclusion in a panel of diagnostic and prognostic biomarkers.
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