11,207 research outputs found
The identified boulders from LCAM DOM image and information of all source craters
No full text<p>This website contains Data Set S1 and Data Set S2, derived from the manuscript '<strong>Oblique impact adjacent to Chang’E-5 sampling site: Fine-scale analysis and implication on the provenance of returned samples</strong>,' authored by Wenhui Wu, Zhaopeng Chen, Xin Ren, Dawei Liu, Xingguo Zeng, Yuan Chen, Wangli Chen, Wei Yan, Bin Liu, Xiaoxia Zhang, and Jianjun Liu, for the Journal of Geophysical Research: Planets.</p>
sj-pdf-1-mdm-10.1177_0272989X221107902 – Supplemental material for PaCAR: COVID-19 Pandemic Control Decision Making via Large-Scale Agent-Based Modeling and Deep Reinforcement Learning
No full textSupplemental material, sj-pdf-1-mdm-10.1177_0272989X221107902 for PaCAR: COVID-19 Pandemic Control Decision Making via Large-Scale Agent-Based Modeling and Deep Reinforcement Learning by Xudong Guo, Peiyu Chen, Shihao Liang, Zengtao Jiao, Linfeng Li, Jun Yan, Yadong Huang, Yi Liu and Wenhui Fan in Medical Decision Making</p
Using performance assessment in secondary school mathematics: an empirical study in a Singapore classroom
No full textThis article reports an exploratory study on using performance assessment in mathematics instruction in a high-performing secondary school in Singapore. An intact mathematics class participated in the study, and received chapter-based performance tasks as intervention during regular mathematics lessons for about one and a half school years. The performance tasks used included authentic and/or open-ended tasks. The students’ academic achievements and attitudes in mathematics were compared with a comparison class that did not receive the intervention. Both quantitative and qualitative data were collected, mainly through questionnaire surveys, performance task tests, conventional school exams, and interviews with students and teachers. The results suggest that the students receiving the intervention performed significantly better than their counterparts in solving conventional exam problems, and in general they also showed more positive changes in attitudes towards mathematics and mathematics learning. The students from the experimental class also expressed positive views about the benefits of using performance tasks in promoting their ability in higher order thinking, though no statistically significant difference was detected between the two classes of students in solving unconventional tasks before and after intervention. Overall, the results appear to support teachers’ using contextualised problems in real life situations and open-ended investigations in students’ learning of mathematic
The derived data in manuscript Oblique impact adjacent to Chang'E-5 landing site: Fine-scale analysis and implication on the provenance of returned samples
No full text<p>This website contains the derived data in the <em>manuscript <span>Oblique impact adjacent to Chang’E-5 landing site: </span><span>F</span><span>ine-scale analysis and implication on the provenance of returned samples </span></em>by <span>Wenhui Wu</span><span>, </span><span>Zhaopeng Chen</span><span>, Xin Ren</span><span>, Dawei Liu</span><span>,</span><span> </span><span>Xingguo Zeng, Yuan Chen, Wangli Chen, Wei Yan, Bin Liu,Xiaoxia Zhang, Jianjun Liu</span> for <em><span>Journal of Geophysical Research: Planets</span></em></p>
sj-docx-1-msc-10.1177_09691413231174163 - Supplemental material for Trends in colorectal cancer screening in the United States, 2012 to 2020
No full textSupplemental material, sj-docx-1-msc-10.1177_09691413231174163 for Trends in colorectal cancer screening in the United States, 2012 to 2020 by Yue He, Tong Xu, Jiaxin Fang, Li Tong, Wenhui Gao, Yuan Zhang, Yanfang Wang, Yan Xu, Shunyao Shi, Siyu Liu and Lina Jin in Journal of Medical Screening</p
Venom gland transcriptomes of two elapid snakes (<it>Bungarus multicinctus </it>and <it>Naja atra</it>) and evolution of toxin genes
No full textAbstract Background Kraits (genus Bungarus) and cobras (genus Naja) are two representative toxic genera of elapids in the old world. Although they are closely related genera and both of their venoms are very toxic, the compositions of their venoms are very different. To unveil their detailed venoms and their evolutionary patterns, we constructed venom gland cDNA libraries and genomic bacterial artificial chromosome (BAC) libraries for Bungarus multicinctus and Naja atra, respectively. We sequenced about 1500 cDNA clones for each of the venom cDNA libraries and screened BAC libraries of the two snakes by blot analysis using four kinds of toxin probes; i.e., three-finger toxin (3FTx), phospholipase A2 (PLA2), kunitz-type protease inhibitor (Kunitz), and natriuretic peptide (NP). Results In total, 1092 valid expressed sequences tags (ESTs) for B. multicinctus and 1166 ESTs for N. atra were generated. About 70% of these ESTs can be annotated as snake toxin transcripts. 3FTx (64.5%) and β bungarotoxin (25.1%) comprise the main toxin classes in B. multicinctus, while 3FTx (95.8%) is the dominant toxin in N. atra. We also observed several less abundant venom families in B. multicinctus and N. atra, such as PLA2, C-type lectins, and Kunitz. Peculiarly a cluster of NP precursors with tandem NPs was detected in B. multicinctus. A total of 71 positive toxin BAC clones in B. multicinctus and N. atra were identified using four kinds of toxin probes (3FTx, PLA2, Kunitz, and NP), among which 39 3FTx-postive BACs were sequenced to reveal gene structures of 3FTx toxin genes. Conclusions Based on the toxin ESTs and 3FTx gene sequences, the major components of B. multicinctus venom transcriptome are neurotoxins, including long chain alpha neurotoxins (α-ntx) and the recently originated β bungarotoxin, whereas the N. atra venom transcriptome mainly contains 3FTxs with cytotoxicity and neurotoxicity (short chain α-ntx). The data also revealed that tandem duplications contributed the most to the expansion of toxin multigene families. Analysis of nonsynonymous to synonymous nucleotide substitution rate ratios (dN/dS) indicates that not only multigene toxin families but also other less abundant toxins might have been under rapid diversifying evolution.</p
Why hedge? Extent, nature, and determinants of derivative usage in U.S. municipalities
No full textUsing a hand-collected dataset of over 300 observations of large U.S. cities and counties, this paper investigates the extent, nature and determinants of derivatives usage in the municipal sector.Over half of our sample entities engage in derivative transactions and a vast majority of these transactions are intended to manage interest rate risk. Swaps, by far, are the most popular derivative instrument. In terms of the determinants of derivative usage,we find that the propensity to use derivatives as well as the extent of derivative usage is higher for municipalities that are larger and more financially constrained. We do not find growth to be related to municipal derivative usage. Contrary to suggestions made in the popular press, we fail to find managerial opportunism to be a significant factor in municipal derivative usage. We also find that more sophisticated managers of large municipalities and less sophisticated managers of small municipalities are more likely to engage in derivative transactions.Peer reviewe
A study on the reliability of consecutive k-Out-of-n: G systems based on Copula
No full textThe computation of reliability characteristics of a system that consists of dependent components is sometimes difficult especially when the type of dependence is not known. This article introduces the copula method to calculate the reliability of dependent consecutive k-out-of-n: G systems. The components in these systems are dependent on each other and the dependency may be either linear or nonlinear. The copula is a popular tool for modeling the dependence structure of data. It contains the information about the dependency structure of a vector of random variables and can capture nonlinear dependence. Based on the copula theory, the article analyzes the consecutive k-out-of-n: G systems and gets the reliability indexes. Finally, some numerical examples are presented to illustrate the results obtained in this article.Peer reviewe
Numerical prediction of tunnelling-induced displacement field in large and very shallow tunnels
No full textThe application of a displacement field at the excavation boundary is a widely used and effective numerical technique to compute tunnelling-induced displacements. The principal assumption of this method is that the deformed tunnel shape is similar to the original one, i.e., circular, while its bottom remains fixed in its original position. In this paper, three-dimensional numerical analyses are described to propose a more suitable criterion for very shallow and large-diameter tunnels, characterized by two separated elliptical contraction shapes for the upper and lower parts of the tunnel section. Furthermore, quantitative description of the deformed pattern is provided, and the relationship of contraction and translation parameters with tunnel depth-to-diameter ratio is summarized and validated against monitoring data. The results show that the most appropriate deformation pattern for very shallow and large tunnels is characterized by an elliptical shape in the upper section and a circular shape in the lower part. The new approach provides a more realistic prediction of
the surface displacement field if compared to that predicted by using the homothetic contraction of the tunnel section
Capital asset accounting policies under GASB Statement No. 34: Characteristics, antecedents, and implications
No full textIn this paper, we study the evolution of state and local governments’ capital asset accounting policies from the adoption of GASB Statement No. 34 through the fiscal year ending in 2016. We document substantial cross-sectional and time-series variation in the capitalization thresholds and estimated useful lives pertaining to major classes of capital assets, including buildings, equipment, improvements, and infrastructure assets. Diversity in capital asset accounting policies potentially diminishes the comparability of capital asset accounting information across governments and over time. We also discuss matters related to the implementation and ongoing use of the modified approach for reporting infrastructure assets. Our findings are useful to the GASB as well as to users of government financial reports.Peer reviewe
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