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Yan, Wei,Chen, W.Q. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.2
Free vibration and dynamic responses of piles semi-rigidly connected with the superstructures are investigated. Timoshenko beam theory is employed to characterize the pile partially embedded in a two-parameter elastic foundation. The formulations for the method of reverberation-ray matrix (MRRM) are then derived to investigate the dynamics of the pile with surface cracks, which are modeled as massless rotational springs. Comparison with existent numerical and experimental results indicates the proposed method is very effective and accurate for dynamic analysis, especially in the high frequency range. Finally, the effects of some physical parameters on the natural frequencies, frequency responses and transient responses of the piles are studied.
Yan Wei,Han Xiaoxiang,Chen Keke,Zhang Xiaofang,Kuang Yingying,Tang Xiujuan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Ionic liquid catalysts which combine the characters of the Brønsted–Lewis solid acids and the ionic liquidare prepared. The obtained composite materials were well characterized by FT-IR, TGA, 1H NMR, 13CNMR and investigated their performance for acetalization. The acid strength was determined by theHammett method combined with UV–vis spectroscopy. Response surface methodology (RSM) wasapplied to optimize the synthesis of benzaldehyde glycol acetal and the effects of various reactionconditions. A Box–Behnken experimental Design (BBD) was employed to search for the optimal yield. The kinetic study for the acetalization was performed under the optimum operating conditions
Yanwei Zhao(Yanwei Zhao),Tae-Yeong Choi(Tae-Yeong Choi) 글로벌융합연구학회 2023 글로벌융합연구학회지 Vol.2 No.1
In this paper, we examine the effects of ESG(corporate environmental, social and governance) on firm petformance and financial risk. We choose China's A-share manufacturing firms listed on Shanghai and Shenzhen Stock Exchanges. Sample span covers January 2010 to December 2020. We obtain the financial data from the online CSMAR DB and Wind DB. Using panel data, we employ panel regression analysis. We choose Tobin's Q and Altrnan's Z-score as dependent variables to calculate firm performance and financial risk. We select the popular Bloomberg ESG composite score as independent variable to measure the corporate ESG. In addition, we add six control variables, namely, firm size, growth, book-to-market value ratio, rate of return, annual and industry dummy variables. We find that the ESG not only improve firm perfonnm1ce but also reduce film's financial risk. These findings are largely consistent with prior studies. This paper has at least two limitations due to sample collection difficulty. First, we use only the manufacturing industry data for empirical analysis. Second, we include only the state-owned firms in the sample, excluding the private manufacturing industry. In the future studies, we hope to overcome these limitations of this paper.
Genomic identification of microRNA promoters and their cis-acting elements in Populus
Yanwei Wang,Min Chen,Ming Wei,Zhanghui Dong,Hai Bao 한국유전학회 2016 Genes & Genomics Vol.38 No.4
MicroRNAs (miRNAs) are non-coding singlestranded RNAs of appropriately 21 nucleotides in length that negatively regulate post-transcriptional processes in plants and animals. In recent years, while an increasing number of miRNAs has been identified in various species, little is known regarding the specific transcriptional regulation of miRNAs in Populus. In this investigation, 368 miRNAs belonging to 37 miRNA families in Populus were analyzed to identify promoter regions and predict the distribution patterns of core promoter elements [TATA boxes and transcription start sites (TSSs)], as well as main cisacting elements through a bioinformatics approach. A total of 368 precursor miRNA (pre-miRNA) gene loci belonging to 213 unique miRNAs were detected. We identified 229 promoters and further predicted 121 TSSs and TATA boxes for 139 pre-miRNAs. The conserved motifs, base composition and the average free energy profiles in the neighboring regions of TSSs were further analyzed. In addition, 101 types of cis-acting elements, such as anaerobic induction elements, abscisic acid-response elements, and MYB binding sites, were predicted in the predicted promoter regions of the pre-miRNAs. The data obtained in our investigation may aid in the analysis of specific upstream sequences of pre-miRNAs for differential expression and further our understanding of the molecular biology of miRNAs in Populus.
Research Framework for Risk Management on Civil Engineering Projects Invested by Chinese Government
Yanwei Wang,Xingzhi Liu 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Due to the characteristic of social public welfare and huge scale, civil engineering projects invested by government are the majority part of investment in fixed assets in China. However, as the current investment management mechanism joined together with Investment, Construction, Management and Operation, there are a large number of projects issues just like a low executive effectiveness, a wastej of recourses, unrealizable objectives. One main reason which causes the issues above is that there is no effective risk management mechanism for civil engineering projects. As there are so many stakeholders and so complex principal-agent relationships, it is not enough to rely on project management by project manager. Research from the view of governance can build a risk management frame work for civil engineering projects so that project risks can be deduced and then utilize on the investment by government can be improved.