727 research outputs found
sj-docx-1-tva-10.1177_15248380221147559 – Supplemental material for The Association Between Child Maltreatment and Pathological Narcissism: A Three-Level Meta-Analytic Review
No full textSupplemental material, sj-docx-1-tva-10.1177_15248380221147559 for The Association Between Child Maltreatment and Pathological Narcissism: A Three-Level Meta-Analytic Review by Shuling Gao, Delin Yu, Mark Assink, Ko Ling Chan, Ling Zhang and Xianxin Meng in Trauma, Violence, & Abuse</p
Advances in medical imaging and gamma ray spectroscopy
No full textThis thesis describes some results from the research by the author in his three year PhD period. The work presented can be divided into two major areas--developing detectors for Positron Emission Tomography and the application of gamma ray spectroscopy based on scintillation detectors. In recent years, great effort has been made to improve the performance of PET instrumentation. As a result, some new concepts were introduced in the design of modem PET systems. Several small and dedicated PET systems have been developed which are aimed to provide better cost effectiveness and image quality. Detectors with Depth-of-interaction capability helped to reduce the degradation of PET image quality due to the parallax error. In order to overcome some intrinsic limitations of PET, such as the relatively poor spatial resolution, PET systems compatible with other imaging modalities like MRI, CT and SPECT enables one to combine the quantitative information provided by PET and the structural (anatomical) information from MRI or CT. A Positron Emission Mammography system was designed for breast cancer imaging application. It can be placed inside an existing MR imaging system currently used in Royal Marsden Hospital. The PET detector was designed to work simultaneously with the MRI system. The Electromagnetic Interference (EMI) between the two imaging systems can be minimised by placing the conducting material, such as the read-out electronics for PET, outside the MRI system. In this design, the scintillation crystals are connected to the remote photodetectors through fibre light-guides of 2m in length. A comprehensive feasibility study based on both Monte Carlo simulation and experimental measurements was carried out. For research applications such as small animal PET imaging, we developed a Depth-of-interaction (DOI) PET detector based on the Hybrid Photodiode (HPD). A prototype detector was constructed and tested. The results show a DOI resolution of 5-8mm and a timing resolution better than 5ns. The second part of this thesis presents the work in gamma ray spectroscopy. A number of algorithms for unconstrained spectrum de-convolution were compared using both simulated and measured data. The application of this technique on energy- loss spectra collected using a 3" Nal scintillation counter shows huge improvement in both energy-resolution and effective detector sensitivity. This makes it possible to use such a detector as a replacement for HPGe spectrometers for some applications. The work in gamma ray spectroscopy also led to the development of a range of large volume scintillation detectors, which provided much-improved energy-resolution compared with the standard 3" Nal detectors. These detectors were shown to be ideal detectors for use in conjunction with the spectrum de-convolution process.</p
The role of religionsity and ethical climate on hotelier: a conceptual study on ethical decision making
No full textThe paper aims to explore the causes and motives behind hoteliers in ethical decision
making with proposed theoretical model. Through the review of past studies, researchers
employed several business ethical theories to provide significant understanding of ethical
dilemma faced by hoteliers and suggested possible factors played an important role in it.
Moreover, researchers believed that with the presence of religiosity on ethical decision
making is greater with higher level of ethical climate
Three Benchmark Datasets for Scholarly Article Layout Analysis
No full textDatasetThis dataset contains three benchmark datasets as part of the scholarly output of and ICDAR 2021 paper: Meng Ling, Jian Chen, Torsten Moller, Petra Isenberg, Tobias Isenberg, Michael Sedlmair, Robert S. Laramee, Han-Wei Shen, Jian Wu, and C. Lee Giles, Document Domain Randomization for Deep Learning Document Layout Extraction, 16th International Conference on Document Analysis and Recognition (ICDAR) 2021. September 5-10, Lausanne, Switzerland. This dataset contains nine class labels: abstract, algorithm, author, body text, caption, equation, figure, table, and title
Li shi jia ji /
No full textv. 1 Meng yu bi tan. Chang shan gong zi shu nian pu. Shi tou shan ren yi gao -- v. 2 Ling shi qi shi chao -- v. 3 Qian jia shi zhu -- v. 4-5 Shi xue tang shi chao -- v. 5 Feng yan ting ci -- v. 6 Mu geng cao tang shi chao. Qin zhou ci -- v. 7-8 Jiao yuan shi chao -- v. 8 Xue hong ci -- v. 9 Ding hai ru du ji cheng -- v. 10 Qing tian shan lu shi chao -- v. 11 Yue ao yi shi. Se lu yi shi. Zhao jui zhang xue zue chan shi yu lu.Mode of access: Internet
Associations of physical activity levels and screen time with oral glucose tolerance test profiles in Singaporean women of reproductive age actively trying to conceive: the S-PRESTO study
No full textSocioeconomic inequalities in hospital births in China between 1988 and 2008.
No full textOBJECTIVE: To assess trends in hospital births in China during 1988-2008 in an effort to determine if efforts to overcome financial barriers to giving birth in hospital have reduced the access gap between the rich and the poor. METHODS: Cross-sectional data obtained from four National Health Service Surveys were used to determine trends in hospital births during 1988-2008. Crude and adjusted annual rates were calculated by means of Poisson regression and were used to define trends across socioeconomic regions and households in different income quintiles. FINDINGS: In 2008 women throughout China were giving birth in hospital almost universally except in region IV, the most remote rural region, where the percentage of hospital births was only 60.8. Hospital births in this region had increased steadily before 2002, but after that year the upward trend slowed down. During 1988-2001 the average yearly increase had been 21%, but in 2002-2008 it dropped to 10% (P = 0.0031). Inequalities between socioeconomic regions were greater than among individual households belonging to different income strata. By 2008 the difference between low- and high-income households in the proportion of hospital births had become very small (96.1% and 87.7% of high- and low-income households, respectively, gave birth in hospital that year). CONCLUSION: Most Chinese women now give birth in hospital, but the poorest rural region is still lagging behind. A more active and comprehensive approach will be needed to increase hospital births in these remote, hard-to-reach populations
Charge sharing energy correction in CdTe sensors using machine learning and its application in SPECT imaging
No full textSubmission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01The student, Can Yang, accepted the attached license on 2021-12-07 at 15:26.The student, Can Yang, submitted this Thesis for approval on 2021-12-07 at 15:52.This Thesis was approved for publication on 2021-12-08 at 13:32.DSpace SAF Submission Ingestion Package generated from Vireo submission #17403 on 2022-04-06 at 17:18:00Made available in DSpace on 2022-04-29T21:46:20Z (GMT). No. of bitstreams: 2
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Previous issue date: 2021-12-08Embargo set by: Seth Robbins for item 123380
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Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I OnlySmall-pixel CdTe/CZT detectors based multi-Isotope hyperspectral SPECT imaging systems suffering serious degradation of energy performance and detection efficiency due to the incomplete charge collection. The charge sharing events collected by more than one pixel usually lose energy which is relevant to the collected energy ratio. When the interaction of photon is closer to the metal contact gap between metal contacts and loss more energy, the collected energy ratio by several pixels is more evenly distributed. In this thesis, a multi-pixel charge sharing energy reconstruction method based on Fully Connected Neural Network (FCNN) was developed and can flexibly reconstruct multi-pixel charge sharing events energy. The proposed FCNN charge sharing correction algorithm could enhance the spectral performance of the small-pixel CdTe semiconductor detectors by reconstructing bi-pixel, triple-pixel, and quad-pixel charge sharing events. Compared to the traditional charge-sharing discrimination (CSD) method, the correction of the charge-sharing events could increase the sensitivity of SPECT system with higher detection efficiency. In this study, we will compare the pure energy reconstruction and combination reconstruction energy reconstruction method implying bi-pixel, tri-pixel, and quad-pixel events and the results of traditional charge sharing addition (CSA) and charge sharing discrimination (CSD) methods. The machine learning method shows significant flexibility in multi-pixel charge sharing energy reconstruction and potential in sub-pixel SPECT imaging. Our future work is planned to investigate the application of FCNN on position estimation for increasing of the spatial resolution of the SPECT system
Inverted compound eye camera for second generation MRI compatible SPECT system
No full textIn this work, we will evaluate a novel design of the second-generation MRI compatible SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 ICE-camera panels that consists of a very large number (up to 1500) of independent micro-pinhole-gamma-camera-elements (MCEs) looking at the object. Each MCE only covers a narrow view angular through the object space. This system design offers several unique advantages for the MR-compatible SPECT imaging application. First, this design allows for a greatly improved system sensitivity over the more conventional pinhole SPECT system designs. Our Monte Carlo study showed that the MRC-SPECT-II system could deliver a peak geometry efficiency of around 1.5% (as compared to the typical levels of 0.1%-0.01% found in modern pre-clinical SPECT instrumentations), while maintaining an excellent spatial resolution of around 0.5 mm and a single-position field-of-view (FOV) of 1 cm. Second, the ICE camera design also allows for an ultra-compact detection system that helps to fit the MRC-SPECT-II system inside most of high-field pre-clinical MR system. Furthermore, given the very large number of micro-camera-elements pointing towards the object, the MRC-SPECT-II system design offers a super-rich angular sampling of the object. Finally, an ICE-camera-based SPECT system typically uses a highly de-magnifying geometry that requires a reduced detector volume, compared to typical pinhole SPECT system that relies on magnifying geometry to achieve a high spatial resolution. This offers the practical benefit of potentially lower construction cost. In this study, we used Monte Carlo studies to demonstrate the performance benefit of the MRC-SPECT-II system over the existing MRC-SPECT system that we have developed in our lab. We have also expanded the Monte Carlo study to evaluate the use of the ICE-SPECT concept for imaging larger objects, human brain.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01The student, Xiaochun Lai, accepted the attached license on 2015-07-23 at 10:28.The student, Xiaochun Lai, submitted this Thesis for approval on 2015-07-23 at 10:28.This Thesis was approved for publication on 2015-07-23 at 13:26.DSpace SAF Submission Ingestion Package generated from Vireo submission #8628 on 2015-09-29 at 15:06:53Made available in DSpace on 2015-09-29T21:08:26Z (GMT). No. of bitstreams: 2
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The transport behaviour of microplastics in longitudinal mixing and hyporheic exchange under varied flow conditions
No full textMicroplastics is an emerging pollutant that are increasingly detected in major rivers around the world. They are potentially harmful to the natural environment due to their toxicity and potential for bioaccumulation. Yet much of the plastics today remain “missing” as transport and sink mechanisms of plastics and microplastics has not been properly studied. This study develops a novel method to track microplastic movement where spherical Polyethylene (PE) microplastics of size ranging from 40 to 46µm is stained using Nile Red. The dispersion behaviour of microplastics is subsequently studied by predicting the longitudinal dispersion coefficient from the standard Advection-Dispersion (ADE) Model at uniform flow discharges, and with the addition of a weir. Stable fluorescence detection of the microplastics in the water is achieved. This method proves to be successful in tracking the temporal concentration distribution of microplastics in the flow, producing a similar dispersion curve to conventional dye tracers. A comparison of the microplastics coefficients with that of Rhodamine WT further reveals that Polyethylene microplastics disperses in a similar manner as Rhodamine in the water column. This marks the potential of using Rhodamine WT as a proxy to study the dispersion characteristics of microplastics in natural rivers.Bachelor of Engineering (Environmental Engineering
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