SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Reza Salim) srt2:(2015-2019)"

Sökning: WFRF:(Reza Salim) > (2015-2019)

  • Resultat 1-26 av 26
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Ademuyiwa, Adesoji O., et al. (författare)
  • Determinants of morbidity and mortality following emergency abdominal surgery in children in low-income and middle-income countries
  • 2016
  • Ingår i: BMJ Global Health. - : BMJ Publishing Group Ltd. - 2059-7908. ; 1:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Child health is a key priority on the global health agenda, yet the provision of essential and emergency surgery in children is patchy in resource-poor regions. This study was aimed to determine the mortality risk for emergency abdominal paediatric surgery in low-income countries globally.Methods: Multicentre, international, prospective, cohort study. Self-selected surgical units performing emergency abdominal surgery submitted prespecified data for consecutive children aged <16 years during a 2-week period between July and December 2014. The United Nation's Human Development Index (HDI) was used to stratify countries. The main outcome measure was 30-day postoperative mortality, analysed by multilevel logistic regression.Results: This study included 1409 patients from 253 centres in 43 countries; 282 children were under 2 years of age. Among them, 265 (18.8%) were from low-HDI, 450 (31.9%) from middle-HDI and 694 (49.3%) from high-HDI countries. The most common operations performed were appendectomy, small bowel resection, pyloromyotomy and correction of intussusception. After adjustment for patient and hospital risk factors, child mortality at 30 days was significantly higher in low-HDI (adjusted OR 7.14 (95% CI 2.52 to 20.23), p<0.001) and middle-HDI (4.42 (1.44 to 13.56), p=0.009) countries compared with high-HDI countries, translating to 40 excess deaths per 1000 procedures performed.Conclusions: Adjusted mortality in children following emergency abdominal surgery may be as high as 7 times greater in low-HDI and middle-HDI countries compared with high-HDI countries. Effective provision of emergency essential surgery should be a key priority for global child health agendas.
  •  
2.
  • Correa, J., et al. (författare)
  • Characterisation of a PERCIVAL monolithic active pixel prototype using synchrotron radiation
  • 2016
  • Ingår i: Journal of Instrumentation. - : IOP. - 1748-0221. ; 11:2
  • Tidskriftsartikel (refereegranskat)abstract
    • PERCIVAL ("Pixelated Energy Resolving CMOS Imager, Versatile And Large") is a monolithic active pixel sensor (MAPS) based on CMOS technology. Is being developed by DESY, RAL/STFC, Elettra, DLS, and PAL to address the various requirements of detectors at synchrotron radiation sources and Free Electron Lasers (FELs) in the soft X-ray regime. These requirements include high frame rates and FELs base-rate compatibility, large dynamic range, single-photon counting capability with low probability of false positives, high quantum efficiency (QE), and (multi-)megapixel arrangements with good spatial resolution. Small-scale back-side-illuminated (BSI) prototype systems are undergoing detailed testing with X-rays and optical photons, in preparation of submission of a larger sensor. A first BSI processed prototype was tested in 2014 and a preliminary result—first detection of 350eV photons with some pixel types of PERCIVAL—reported at this meeting a year ago. Subsequent more detailed analysis revealed a very low QE and pointed to contamination as a possible cause. In the past year, BSI-processed chips on two more wafers were tested and their response to soft X-ray evaluated. We report here the improved charge collection efficiency (CCE) of different PERCIVAL pixel types for 400eV soft X-rays together with Airy patterns, response to a flat field, and noise performance for such a newly BSI-processed prototype sensor.
  •  
3.
  • Correa, J., et al. (författare)
  • On the Charge Collection Efficiency of the PERCIVAL Detector
  • 2016
  • Ingår i: Journal of Instrumentation. - : IOP. - 1748-0221. ; 11:12
  • Tidskriftsartikel (refereegranskat)abstract
    • The PERCIVAL soft X-ray imager is being developed by DESY, RAL, Elettra, DLS, and PAL to address the challenges at high brilliance Light Sources such as new-generation Synchrotrons and Free Electron Lasers. Typical requirements for detector systems at these sources are high frame rates, large dynamic range, single-photon counting capability with low probability of false positives, high quantum efficiency, and (multi)-mega-pixel arrangements. PERCIVAL is a monolithic active pixel sensor, based on CMOS technology. It is designed for the soft X-ray regime and, therefore, it is post-processed in order to achieve high quantum efficiency in its primary energy range (250 eV to 1 keV) . This work will report on the latest experimental results on charge collection efficiency obtained for multiple back-side-illuminated test sensors during two campaigns, at the P04 beam-line at PETRA III, and the CiPo beam-line at Elettra, spanning most of the primary energy range as well as testing the performance for photon-energies below 250 eV . In addition, XPS surface analysis was used to cross-check the obtained results.
  •  
4.
  • Fröjdh, Christer, 1952-, et al. (författare)
  • Precision scan-imaging for paperboard quality inspection utilizing X-ray fluorescence
  • 2018
  • Ingår i: Journal of Instrumentation. - : Institute of Physics Publishing. - 1748-0221. ; 13:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Paperboard is typically made up of a core of cellulose fibers [C6H10O5] and a coating layer of [CaCO3]. The uniformity of these layers is a critical parameter for the printing quality. Current quality control methods include chemistry based visual inspection methods as well as X-ray based methods to measure the coating thickness. In this work we combine the X-ray fluorescence signals from the Ca atoms (3.7 keV) in the coating and from a Cu target (8.0 keV) placed behind the paper to simultaneously measure both the coating and the fibers. Cu was selected as the target material since its fluorescence signal is well separated from the Ca signal while its fluorescence's still are absorbed sufficiently in the paper. A laboratory scale setup is built using stepper motors, a silicon drift detector based spectrometer and a collimated X-ray beam. The spectroscopic image is retrieved by scanning the paperboard surface and registering the fluorescence signals from Ca and Cu. The exposure time for this type of setups can be significantly improved by implementing spectroscopic imaging sensors. The material contents in the layers can then be retrieved from the absolute and relative intensities of these two signals.
  •  
5.
  • Khromova, A., et al. (författare)
  • Report on recent results of the PERCIVAL soft X-ray imager
  • 2016
  • Ingår i: Journal of Instrumentation. - : IOP. - 1748-0221. ; 11:November
  • Tidskriftsartikel (refereegranskat)abstract
    • The PERCIVAL (Pixelated Energy Resolving CMOS Imager, Versatile And Large) soft X-ray 2D imaging detector is based on stitched, wafer-scale sensors possessing a thick epi-layer, which together with back-thinning and back-side illumination yields elevated quantum efficiency in the photon energy range of 125–1000 eV. Main application fields of PERCIVAL are foreseen in photon science with FELs and synchrotron radiation. This requires high dynamic range up to 105 ph @ 250 eV paired with single photon sensitivity with high confidence at moderate frame rates in the range of 10–120 Hz. These figures imply the availability of dynamic gain switching on a pixel-by-pixel basis and a highly parallel, low noise analog and digital readout, which has been realized in the PERCIVAL sensor layout. Different aspects of the detector performance have been assessed using prototype sensors with different pixel and ADC types. This work will report on the recent test results performed on the newest chip prototypes with the improved pixel and ADC architecture. For the target frame rates in the 10–120 Hz range an average noise floor of 14e− has been determined, indicating the ability of detecting single photons with energies above 250 eV. Owing to the successfully implemented adaptive 3-stage multiple-gain switching, the integrated charge level exceeds 4 centerdot 106 e− or 57000 X-ray photons at 250 eV per frame at 120 Hz. For all gains the noise level remains below the Poisson limit also in high-flux conditions. Additionally, a short overview over the updates on an oncoming 2 Mpixel (P2M) detector system (expected at the end of 2016) will be reported.
  •  
6.
  • Marras, A., et al. (författare)
  • Experimental characterization of the PERCIVAL soft X-ray detector
  • 2016
  • Ingår i: 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2015. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781467398626
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Considerable interest has been manifested for the use of high-brilliance X-ray synchrotron sources and X-ray Free-Electron Lasers for the investigation of samples.
  •  
7.
  • Minina, Alyona, et al. (författare)
  • The Arabidopsis homolog of Scc4/MAU2 is essential for embryogenesis
  • 2017
  • Ingår i: Journal of Cell Science. - : The Company of Biologists. - 0021-9533 .- 1477-9137. ; 130, s. 1051-1063
  • Tidskriftsartikel (refereegranskat)abstract
    • Factors regulating dynamics of chromatin structure have direct impact on expression of genetic information. Cohesin is a multi-subunit protein complex that is crucial for pairing sister chromatids during cell division, DNA repair and regulation of gene transcription and silencing. In non-plant species, cohesin is loaded on chromatin by the Scc2-Scc4 complex (also known as the NIBPL-MAU2 complex). Here, we identify the Arabidopsis homolog of Scc4, which we denote Arabidopsis thaliana (At) SCC4, and show that it forms a functional complex with AtSCC2, the homolog of Scc2. We demonstrate that AtSCC2 and AtSCC4 act in the same pathway, and that both proteins are indispensable for cell fate determination during early stages of embryo development. Mutant embryos lacking either of these proteins develop only up to the globular stage, and show the suspensor overproliferation phenotype preceded by ectopic auxin maxima distribution. We further establish a new assay to reveal the AtSCC4-dependent dynamics of cohesin loading on chromatin in vivo. Our findings define the Scc2-Scc4 complex as an evolutionary conserved machinery controlling cohesin loading and chromatin structure maintenance, and provide new insight into the plant-specific role of this complex in controlling cell fate during embryogenesis.
  •  
8.
  • Moschou, Panagiotis Nikolaou, et al. (författare)
  • EXTRA SPINDLE POLES (Separase) controls anisotropic cell expansion in Norway spruce (Picea abies) embryos independently of its role in anaphase progression
  • 2016
  • Ingår i: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 212, s. 232-243
  • Tidskriftsartikel (refereegranskat)abstract
    • The caspase-related protease separase (EXTRA SPINDLE POLES, ESP) plays a major role in chromatid disjunction and cell expansion in Arabidopsis thaliana. Whether the expansion phenotypes are linked to defects in cell division in Arabidopsis ESP mutants remains elusive. Here we present the identification, cloning and characterization of the gymnosperm Norway spruce (Picea abies, Pa) ESP. We used the P.abies somatic embryo system and a combination of reverse genetics and microscopy to explore the roles of Pa ESP during embryogenesis. Pa ESP was expressed in the proliferating embryonal mass, while it was absent in the suspensor cells. Pa ESP associated with kinetochore microtubules in metaphase and then with anaphase spindle midzone. During cytokinesis, it localized on the phragmoplast microtubules and on the cell plate. Pa ESP deficiency perturbed anisotropic expansion and reduced mitotic divisions in cotyledonary embryos. Furthermore, whilst Pa ESP can rescue the chromatid nondisjunction phenotype of Arabidopsis ESP mutants, it cannot rescue anisotropic cell expansion. Our data demonstrate that the roles of ESP in daughter chromatid separation and cellexpansion are conserved between gymnosperms and angiosperms. However, the mechanisms of ESP-mediated regulation of cell expansion seem to be lineage-specific.
  •  
9.
  • Niskanen, Ilpo, et al. (författare)
  • Determination of nanoparticle size using Rayleigh approximation and Mie theory
  • 2019
  • Ingår i: Chemical Engineering Science. - : Elsevier. - 0009-2509 .- 1873-4405. ; 201, s. 222-229
  • Tidskriftsartikel (refereegranskat)abstract
    • Accurate determination of the size of nanoparticles has an important role in many different scientific and industrial purposes, such as in material, medical and environment sciences, colloidal chemistry and astrophysics. We describe an effective optical method to determine the size of nanoparticles by analysis of transmission and scattering of visible spectral range data from a designed UV-Vis multi-spectrophotometer. The size of the nanoparticles was calculated from the extinction cross section of the particles using Rayleigh approximation and Mie theory. We validated the method using polystyrene nanospheres, cellulose nanofibrils, and cellulose nanocrystals. A good agreement was achieved through graphical analysis between measured extinction cross section values and theoretical Rayleigh approximation and Mie theory predictions for the sizes of polystyrene nanospheres at wavelength range 450-750 nm. Provided that Rayleigh approximation's forward scattering (FS)/back scattering (BS) ratio was smaller than 1.3 and Mie theory's FS/BS ratio was smaller than 1.8. A good fit for the hydrodynamic diameter of nanocellulose was achieved using the Mie theory and Rayleigh approximation. However, due to the high aspect ratio of nanocellulose, the obtained results do not directly reflect the actual cross-sectional diameters of the nanocellulose. Overall, the method is a fast, relatively easy, and simple technique to determine the size of a particle by a spectrophotometer. Consequently, the method can be utilized for example in production and quality control purposes as well as for research and development applications.
  •  
10.
  • Norlin, Börje, et al. (författare)
  • Readout cross-talk for alpha-particle measurements in a pixelated sensor system
  • 2015
  • Ingår i: Journal of Instrumentation. - : IOP. - 1748-0221. ; 10
  • Tidskriftsartikel (refereegranskat)abstract
    • Simulations in Medici are performed to quantify crosstalk and charge sharing in a hybrid pixelated silicon detector. Crosstalk and charge sharing degrades the spatial and spectral resolution of single photon processing X-ray imaging systems. For typical medical X-ray imaging applications, the process is dominated by charge sharing between the pixels in the sensor. For heavier particles each impact generates a large amount of charge and the simulation seems to over predict the charge collection efficiency. This indicates that some type of non modelled degradation of the charge transport efficiency exists, like the plasma effect where the plasma might shield the generated charges from the electric field and hence distorts the charge transport process. Based on the simulations it can be reasoned that saturation of the amplifiers in the Timepix system might generate crosstalk that increases the charge spread measured from ion impact on the sensor.
  •  
11.
  • Norlin, Börje, 1967-, et al. (författare)
  • X-ray fluorescence measurements of toxic metal content in ash from municipal solid waste incineration
  • 2017
  • Ingår i: 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). - : IEEE. - 9781509016426
  • Konferensbidrag (refereegranskat)abstract
    • The vision of this paper is development of an online X-ray fluorescence method for monitoring of metal content in ash from municipal solid waste (MSW) incineration. With such measurements directly on site it is possible to optimize an ash washing process in incineration plants, allowing the fly ash to be stored in a landfill for non-hazardous waste. The presented X-ray fluorescence measurement assures that the measurement accuracy is sufficient for metal content monitoring. The actual measurement process is also fast enough to be possible to implement as an online measurement method. The optimal measurement setup is different for different metals. Several different metals might need environmental monitoring, which metals might vary over time due to systematic variations in waist content. Detection of a wide range of metals will require an X-ray source with variable voltage and multiple detectors.
  •  
12.
  • Olsen, Martin, 1971-, et al. (författare)
  • Schottky model for triboelectric temperature dependence
  • 2018
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 8:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The triboelectric effect, charging by contact, is the working principle in a device called a triboelectric nanogenerator. They are used as efficient energy transducers in energy harvesting. In such generators the charging of surfaces at contact is followed by a separation of the surfaces increasing the electrical energy which can subsequently be used. Different materials have different triboelectric potentials leading to charging at contact. The temperature dependence of the charging has just recently been studied: the triboelectric effect is decreasing with temperature for a generator of Al-PTFE-Cu. Here, we suggest a mechanism to explain this effect assuming ion transfer using a two-level Schottky model where the two levels corresponds to the two surfaces. The difference in binding energy for ions on the two surfaces then enters the formula for charging. We fit the triboelectric power density as a function of temperature obtained from a two-level Schottky model to measured data for nanogenerators made of Al-PTFE-Cu found in three references. We obtain an average separation energy corresponding to a temperature of 365 K which is of the right magnitude for physically adsorbed atoms. We anticipate that this model could be used for many types of triboelectric nanogenerators.
  •  
13.
  • Patel, Riyaz S., et al. (författare)
  • Subsequent Event Risk in Individuals With Established Coronary Heart Disease : Design and Rationale of the GENIUS-CHD Consortium
  • 2019
  • Ingår i: Circulation. - 2574-8300. ; 12:4
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: The Genetics of Subsequent Coronary Heart Disease (GENIUS-CHD) consortium was established to facilitate discovery and validation of genetic variants and biomarkers for risk of subsequent CHD events, in individuals with established CHD.METHODS: The consortium currently includes 57 studies from 18 countries, recruiting 185 614 participants with either acute coronary syndrome, stable CHD, or a mixture of both at baseline. All studies collected biological samples and followed-up study participants prospectively for subsequent events.RESULTS: Enrollment into the individual studies took place between 1985 to present day with a duration of follow-up ranging from 9 months to 15 years. Within each study, participants with CHD are predominantly of self-reported European descent (38%-100%), mostly male (44%-91%) with mean ages at recruitment ranging from 40 to 75 years. Initial feasibility analyses, using a federated analysis approach, yielded expected associations between age (hazard ratio, 1.15; 95% CI, 1.14-1.16) per 5-year increase, male sex (hazard ratio, 1.17; 95% CI, 1.13-1.21) and smoking (hazard ratio, 1.43; 95% CI, 1.35-1.51) with risk of subsequent CHD death or myocardial infarction and differing associations with other individual and composite cardiovascular endpoints.CONCLUSIONS: GENIUS-CHD is a global collaboration seeking to elucidate genetic and nongenetic determinants of subsequent event risk in individuals with established CHD, to improve residual risk prediction and identify novel drug targets for secondary prevention. Initial analyses demonstrate the feasibility and reliability of a federated analysis approach. The consortium now plans to initiate and test novel hypotheses as well as supporting replication and validation analyses for other investigators.
  •  
14.
  • Reza, Salim (författare)
  • Advanced X-ray Detectors for Industrial and Environmental Applications
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The new generation of X-ray free electron laser sources arecapable of producing light beams with billion times higherpeak brilliance than that of the best conventional X-ray sources.This advancement motivates the scientific community to pushforward the detector technology to its limit, in order to de-sign photon detectors which can cope with the extreme fluxgenerated by the free electron laser sources. Sophisticated ex-periments like deciphering the atomic details of viruses, filmingchemical reactions or investigating the extreme states of matterrequire detectors with high frame rate, good spatial resolution,high dynamic range and large active sensor area. The PERCI-VAL monolithic active pixel sensor is being developed by aninternational group of scientists in collaboration to meet theaforementioned detector requirements within the energy rangeof 250 eV to 1 keV, with a quantum efficiency above 90%.In this doctoral researchwork, Monte Carlo algorithm basedGeant4 and finite element method based Synopsys SentaurusTCADtoolkits have been used to simulate, respectively, theX-rayenergy deposition and the charge sharing in PERCIVAL. Energydeposition per pixel and charge sharing between adjacent pixelsat different energies have been investigated and presented.Novel methods for industrial and environmental applica-tions of some commercially available X-ray detectors have beendemonstrated. Quality inspection of paperboards by resolv-ing the layer thicknesses and by investigating orientation ofthe cellulose fibres have been performed using spectroscopicand phase-contrast X-ray imaging. It was found that, usingphase-contrast imaging it is possible to set burn-out like qualityindex on paperboards non-destructively. X-ray fluoroscopicmeasurements have been conducted in order to detect Cr inwater. This method can be used to detect Cr and other toxicelements in leachate in landfills and other waste dumping sites.
  •  
15.
  •  
16.
  • Reza, Salim, 1985-, et al. (författare)
  • Detecting Cr Contamination In Water Using X-Ray Fluorescence
  • 2015
  • Ingår i: 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781467398626
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • With the rapid growth in population and the overwhelming demand of industrial consumer products around the world, the amount of generated wastes is also increasing. Therefore, the optimal utilization of wastes and the waste management policies are very important in order to protect the environment[1]. The most common way of waste management is to dispose them into city dumps and landfills. These disposal sites may produce toxic and green house gases and also a substantial amount of leachate, which can affect the environment[2]. Leachate is liquid, which, while percolating through wastes in a landfill, extracts soluble and suspended solids. Leachate contains toxic and harmful substances, such as Chromium (Cr), Arsenic, Lead, Mercury, Benzene, Chloroform and Methylene Chloride, and can contaminate surface water and aquifers.
  •  
17.
  •  
18.
  • Reza, Salim Hossain, et al. (författare)
  • Transcriptome analysis of embryonic domains in Norway spruce reveals potential regulators of suspensor cell death
  • 2018
  • Ingår i: PLOS ONE. - San Francisco : Public Library of Science. - 1932-6203. ; 13:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The terminal differentiation and elimination of the embryo-suspensor is the earliest manifestation of programmed cell death (PCD) during plant ontogenesis. Molecular regulation of suspensor PCD remains poorly understood. Norway spruce (Picea abies) embryos provide a powerful model for studying embryo development because of their large size, sequenced genome, and the possibility to obtain a large number of embryos at a specific developmental stage through somatic embryogenesis. Here, we have carried out global gene expression analysis of the Norway spruce embryo-suspensor versus embryonal mass (a gymnosperm analogue of embryo proper) using RNA sequencing. We have identified that suspensors have enhanced expression of the NAC domain-containing transcription factors, XND1 and ANAC075, previously shown to be involved in the initiation of developmental PCD in Arabidiopsis. The analysis has also revealed enhanced expression of Norway spruce homologues of the known executioners of both developmental and stress-induced cell deaths, such as metacaspase 9 (MC9), cysteine endopeptidase-1 (CEP1) and ribonuclease 3 (RNS3). Interestingly, a spruce homologue of bax inhibitor-1 (PaBI-1, for Picea abies BI-1), an evolutionarily conserved cell death suppressor, was likewise up-regulated in the embryosuspensor. Since Arabidopsis BI-1 so far has been implicated only in the endoplasmic reticulum (ER)-stress induced cell death, we investigated its role in embryogenesis and suspensor PCD using RNA interference (RNAi). We have found that PaBI-1-deficient lines formed a large number of abnormal embryos with suppressed suspensor elongation and disturbed polarity. Cytochemical staining of suspensor cells has revealed that PaBI-1 deficiency suppresses vacuolar cell death and induces necrotic type of cell death previously shown to compromise embryo development. This study demonstrates that a large number of cell-death components are conserved between angiosperms and gymnosperms and establishes a new role for BI-1 in the progression of vacuolar cell death.
  •  
19.
  •  
20.
  • Reza, Salim, 1985- (författare)
  • Report on Control/DAQ Software Design and Current State of Implementation for the Percival Detector
  • 2015
  • Ingår i: ICALEPCS2015 - Proceedings Melbourne, Australia. - 9783954501489
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The Percival Collaboration is developing a high-speed,low X-ray energy detector capable of detecting single pho-tons while maintaining a large dynamic range of sensitivity.The increased brilliance of state-of-the-art Synchrotronradiation sources and Free Electron Lasers require imagingdetectors capable of taking advantage of these light sourcefacilities. The PERCIVAL ("Pixelated Energy ResolvingCMOS Imager, Versatile and Large") detector is being de-veloped in collaboration between DESY, Elettra SincrotroneTrieste, Diamond Light Source and Pohang Accelerator Lab-oratory.It is a CMOS detector targeting soft X-rays < 1 KeV, witha high resolution of up to 13 M pixels reading out at 120 Hz,producing a challenging data rate of 6 GiB/s.The controls and data acquisition system will include aSoftware Development Kit to allow integration with thirdparty control systems like Tango and DOOCS; an EPICS [1]areaDetector [2] driver will be included by default. It willmake use of parallel readout to keep pace with the datarate, distributing the data over multiple nodes to create asingle virtual dataset using the HDF5 file format for its speedadvantages in high volumes of regular data.This development project will culminate in a control andDAQ system capable of dealing with very high data rateswhile providing easy integration with site-specific controlsystems.This report presents the design of the control system soft-ware for the Percival detector, an update of the current stateof the implementation carried out by Diamond Light Source.
  •  
21.
  • Reza, Salim, 1985- (författare)
  • Stressed in a small group or university? Think Big!
  • 2019
  • Ingår i: Universitetsläraren. - : Universitetsläraren, Sveriges universitetslärare och forskares (SULF) medlemstidning. - 0282-4973. ; :11-feb
  • Annan publikation (populärvet., debatt m.m.)
  •  
22.
  • Reza, Salim, 1985- (författare)
  • Students are stories – let us recognize them
  • 2018
  • Ingår i: Universitetsläraren. - : Universitetsläraren, Sveriges universitetslärare och forskares (SULF) medlemstidning. - 0282-4973. ; :12-feb
  • Annan publikation (populärvet., debatt m.m.)
  •  
23.
  • Reza, Salim, 1985- (författare)
  • Unacknowledged supervisors – superheroes without capes
  • 2018
  • Ingår i: Universitetsläraren. - : Universitetsläraren, Sveriges universitetslärare och forskares (SULF) medlemstidning. - 0282-4973. ; :24-sep
  • Annan publikation (populärvet., debatt m.m.)
  •  
24.
  • Semiconductor Radiation Detectors : Technology and Applications
  • 2017
  • Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this book is to educate the reader on radiation detectors, from sensor to read-out electronics to application. Relatively new detector materials, such as CdZTe and Cr compensated GaAs, are introduced, along with emerging applications of radiation detectors. This X-ray technology has practical applications in medical, industrial, and security applications. It identifies materials based on their molecular composition, not densities as the traditional transmission equipment does. With chapters written by an international selection of authors from both academia and industry, the book covers a wide range of topics on radiation detectors, which will satisfy the needs of both beginners and experts in the field.
  •  
25.
  • Thim, Jan, et al. (författare)
  • X-ray imaging of high velocity moving objects by scanning summation using a single photon processing system
  • 2015
  • Ingår i: Journal of Instrumentation. - : IOP. - 1748-0221.
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray imaging has been used extensively in the manufacturing industry. In the paper and paperboard industry X-ray imaging has been used for measuring parameters such as coat weight, using mean values of X-ray absorption inline in the manufacturing machines. Recently, an interest has surfaced to image paperboard coating with pixel resolved images showing material distribution in the coating on the paperboard, and to do this inline in the paper machine. Naturally, imaging with pixel resolution in an application where the paperboard web travels with velocities in the order on 10 m/s sets harsh demands on the X-ray source and the detector system to be used. This paper presents a scanning imaging method for single photon imaging systems that lower the demands on the source flux by hundreds of times, enabling a system to be developed for high velocity industrial measurement applications. The paper presents the imaging method, a discussion of system limitations, simulations and real measurements in a laboratory environment with a moving test object of low velocity, all to verify the potential and limits of the proposed method.
  •  
26.
  • Wunderer, C. B., et al. (författare)
  • Detector developments at DESY
  • 2016
  • Ingår i: Journal of Synchrotron Radiation. - 0909-0495 .- 1600-5775. ; 23, s. 111-117
  • Tidskriftsartikel (refereegranskat)abstract
    • With the increased brilliance of state-of-the-art synchrotron radiation sources and the advent of free-electron lasers (FELs) enabling revolutionary science with EUV to X-ray photons comes an urgent need for suitable photon imaging detectors. Requirements include high frame rates, very large dynamic range, single-photon sensitivity with low probability of false positives and (multi)-megapixels. At DESY, one ongoing development project-in collaboration with RAL/STFC, Elettra Sincrotrone Trieste, Diamond, and Pohang Accelerator Laboratory-is the CMOS-based soft X-ray imager PERCIVAL. PERCIVAL is a monolithic active-pixel sensor back-thinned to access its primary energy range of 250 eV to 1 keV with target efficiencies above 90%. According to preliminary specifications, the roughly 10 cm × 10 cm, 3.5k × 3.7k monolithic sensor will operate at frame rates up to 120 Hz (commensurate with most FELs) and use multiple gains within 27 μm pixels to measure 1 to ∼ 100000 (500 eV) simultaneously arriving photons. DESY is also leading the development of the AGIPD, a high-speed detector based on hybrid pixel technology intended for use at the European XFEL. This system is being developed in collaboration with PSI, University of Hamburg, and University of Bonn. The AGIPD allows singlepulse imaging at 4.5 MHz frame rate into a 352-frame buffer, with a dynamic range allowing single-photon detection and detection of more than 10000 photons at 12.4 keV in the same image. Modules of 65k pixels each are configured to make up (multi)megapixel cameras. This review describes the AGIPD and the PERCIVAL concepts and systems, including some recent results and a summary of their current status. It also gives a short overview over other FEL-relevant developments where the Photon Science Detector Group at DESY is involved. © 2016 International Union of Crystallography.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-26 av 26
Typ av publikation
tidskriftsartikel (14)
annan publikation (5)
konferensbidrag (4)
samlingsverk (redaktörskap) (1)
doktorsavhandling (1)
bokkapitel (1)
visa fler...
visa färre...
Typ av innehåll
refereegranskat (15)
övrigt vetenskapligt/konstnärligt (6)
populärvet., debatt m.m. (5)
Författare/redaktör
Reza, Salim, 1985- (16)
Lange, S. (5)
Graafsma, Heinz (5)
Marras, A. (5)
Xia, Q. (5)
Zimmer, M. (5)
visa fler...
Smoljanin, S. (5)
Correa, J. (5)
Reza, Salim (5)
Turchetta, R. (4)
Marsh, B. (4)
Cautero, G (4)
Niemann, M. (4)
Shevyakov, I (4)
Tennert, M (4)
Wunderer, C.B. (4)
Giuressi, D. (4)
Khromova, A. (4)
Menk, R. (4)
Stebel, L. (4)
Pedersen, U. (4)
Tartoni, N. (4)
Guerrini, N. (4)
Sedgwick, I. (4)
Göttlicher, P. (3)
Hirsemann, H. (3)
Bozhkov, Peter (3)
Norlin, Börje (3)
Bayer, M. (3)
Minina, Alyona (3)
Pinaroli, G. (3)
Jones, T. J. (2)
Viti, M. (2)
Das, D. (2)
Kim, K. (2)
Fröjdh, Christer, 19 ... (2)
Allahgholi, A. (2)
Rah, S. (2)
Moschou, Panagiotis ... (2)
Norlin, Börje, 1967- (2)
Thungström, Göran (2)
Supra, J. (2)
Hyun, H.J. (2)
Kim, K.S. (2)
Rah, S.Y. (2)
Hoenk, M.E. (2)
Jewell, A.D. (2)
Marchal, J (2)
Yousef, H. (2)
Gutierrez, Emilio (2)
visa färre...
Lärosäte
Högskolan i Gävle (21)
Mittuniversitetet (21)
Sveriges Lantbruksuniversitet (3)
Umeå universitet (2)
Uppsala universitet (2)
Kungliga Tekniska Högskolan (1)
visa fler...
RISE (1)
Karolinska Institutet (1)
visa färre...
Språk
Engelska (26)
Forskningsämne (UKÄ/SCB)
Teknik (16)
Naturvetenskap (11)
Samhällsvetenskap (5)
Medicin och hälsovetenskap (3)
Lantbruksvetenskap (1)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy