On the basis of analyzing the shortages of present studies on plant disease model for autonomous phenomenon, and considering the actual situation, this paper applies the joint factors of environmental change and the i...On the basis of analyzing the shortages of present studies on plant disease model for autonomous phenomenon, and considering the actual situation, this paper applies the joint factors of environmental change and the infectivity for latent plants into the system;therefore we deal with a non-autonomous plant disease model with roguing. Some sufficient conditions are established for extinction of diseases and permanence of the system in this paper.展开更多
A large-scale, thin wall duplex stainless steel impeller with complex geometry was deformed severely and unpredictably during casting and heat treatment processes resulted in dimensional failure for the final part. In...A large-scale, thin wall duplex stainless steel impeller with complex geometry was deformed severely and unpredictably during casting and heat treatment processes resulted in dimensional failure for the final part. In this paper, the distortion of the impeller during casting and heat treatment was calculated. A commercial software, Experto-ViewCast, was used to simulate the transient heat transfer, solidification and mechanical behaviors during the casting and the heat treatment process. The coupled set of governing differential equations for mass, energy and mechanical balance were solved by finite control volume and finite element method. A thermoelastic-visco-plastic rheological model was used to compute the constrained shrinkage of the casting. At each time increment, a coupling of the heat transfer and mechanics was performed. Comparison of the experimental measurements with the model predictions showed good agreement. From the calculated displacements of key points of the blade, the proper inverse displacements were determined to provide an optimum casting pattern and to achieve a uniform and reasonable machining allowance for both faces of the blade.展开更多
In the article, we established a non-autonomous vector infectious disease model, studied the long-term dynamic behavior of the system, and obtained sufficient conditions for the extinction and persistence of infectiou...In the article, we established a non-autonomous vector infectious disease model, studied the long-term dynamic behavior of the system, and obtained sufficient conditions for the extinction and persistence of infectious diseases by constructing integral functions.展开更多
本文基于核准制下"大发审委"(第十七届发行审核委员会)从严审核的自然实验,考察了IPO(initial public offering,首次公开募股)从严审核的资源配置效应。研究发现,在严格的问责制度下,中国证券监督管理委员会发行审核委员会(...本文基于核准制下"大发审委"(第十七届发行审核委员会)从严审核的自然实验,考察了IPO(initial public offering,首次公开募股)从严审核的资源配置效应。研究发现,在严格的问责制度下,中国证券监督管理委员会发行审核委员会(简称发审委)倾向于显著地降低发审通过率,同时规避自身风险,选择财务指标良好的低风险企业(营业收入增长高的企业),而回避高风险但可能具有发展潜力的企业(研发费用高的企业)。其次,在从严审核时期,拟上市企业承担了更多的IPO费用以提高IPO审核通过率。此外,相较非"大发审委"时期的过会企业,"大发审委"审核通过的企业更可能出现业绩变脸,这样的审核标准忽略了企业未来的成长性和发展潜力,没有得到投资者的认同,市场表现也更差。展开更多
In emerging markets, the deviation between the ultimate controlling shareholders' voting rights and their cash flow rights(hereafter "DVC") in the listed firms is quite prevalent. DVC could be introduced...In emerging markets, the deviation between the ultimate controlling shareholders' voting rights and their cash flow rights(hereafter "DVC") in the listed firms is quite prevalent. DVC could be introduced due to the ultimate controlling shareholders' opportunistic incentives, as well as by their incentives to improve firm efficiency. This study uses 229 listed firms ultimately controlled by individuals or families(hereafter "entrepreneurial firms") for 2004 in China, to investigate the effect of DVC on firm value and to determine whether it is different between founder and non-founder controlled firms. We find that DVC has a positive effect on firm value for founder controlled firms. This result implies that investors believe that their interests are better protected by founder controlled firms than by non-founder controlled firms.展开更多
Podoplanin (PDPN) is a mucin-type O-glycoprotein expressed in diverse cell types, such as lymphatic endothelial cells (LECs) in the vascular system and fibroblastic reticular cells (FRCs) in lymph nodes. PDPN on...Podoplanin (PDPN) is a mucin-type O-glycoprotein expressed in diverse cell types, such as lymphatic endothelial cells (LECs) in the vascular system and fibroblastic reticular cells (FRCs) in lymph nodes. PDPN on LECs or FRCs activates CLEC-2 in platelets, triggering platelet activation and/or aggregation through downstream signaling events, including activation of Syk kinase. This mechanism is required to initiate and maintain separation of blood and lymphatic vessels and to stabilize high endothelial venule integrity within lymph nodes. In the vascular system, normal expression of PDPN at the LEC surface requires transcriptional activation of Pdpn by Proxl and modification of PDPN with core 1-derived O-glycans. This review provides a comprehensive overview of the roles of PDPN in vascular development and lymphoid organ maintenance and discusses the mechanisms that regulate PDPN expression related to its function.展开更多
We examine the effectiveness of China’s IFRS adoption from the perspective of an important set of financial report users, foreign institutional investors. We find that foreign institutional investment does not increa...We examine the effectiveness of China’s IFRS adoption from the perspective of an important set of financial report users, foreign institutional investors. We find that foreign institutional investment does not increase after China’s IFRS adoption, and some evidence that it actually declines, particularly among firms with weaker incentives to credibly implement IFRS, or with greater ability to manipulate IFRS’s fair value provisions. We also find that the association between earnings and returns generally declines after IFRS adoption, consistent with reduced earnings quality. In addition, we find that foreign institutional investors’ returns decrease after China’s IFRS adoption. Finally, the decline in foreign institutional investment is greater among investors from countries with weak institutions that have also adopted IFRS. Taken together, our evidence suggests that the weak institutional infrastructure in China’s transitional economy impairs IFRS’s intended goal of attracting institutional investment through improved financial reporting quality. Further, financial information users’ home country institutions and IFRS adoption experience affect the effectiveness of IFRS adoption.展开更多
文摘On the basis of analyzing the shortages of present studies on plant disease model for autonomous phenomenon, and considering the actual situation, this paper applies the joint factors of environmental change and the infectivity for latent plants into the system;therefore we deal with a non-autonomous plant disease model with roguing. Some sufficient conditions are established for extinction of diseases and permanence of the system in this paper.
文摘A large-scale, thin wall duplex stainless steel impeller with complex geometry was deformed severely and unpredictably during casting and heat treatment processes resulted in dimensional failure for the final part. In this paper, the distortion of the impeller during casting and heat treatment was calculated. A commercial software, Experto-ViewCast, was used to simulate the transient heat transfer, solidification and mechanical behaviors during the casting and the heat treatment process. The coupled set of governing differential equations for mass, energy and mechanical balance were solved by finite control volume and finite element method. A thermoelastic-visco-plastic rheological model was used to compute the constrained shrinkage of the casting. At each time increment, a coupling of the heat transfer and mechanics was performed. Comparison of the experimental measurements with the model predictions showed good agreement. From the calculated displacements of key points of the blade, the proper inverse displacements were determined to provide an optimum casting pattern and to achieve a uniform and reasonable machining allowance for both faces of the blade.
文摘In the article, we established a non-autonomous vector infectious disease model, studied the long-term dynamic behavior of the system, and obtained sufficient conditions for the extinction and persistence of infectious diseases by constructing integral functions.
文摘本文基于核准制下"大发审委"(第十七届发行审核委员会)从严审核的自然实验,考察了IPO(initial public offering,首次公开募股)从严审核的资源配置效应。研究发现,在严格的问责制度下,中国证券监督管理委员会发行审核委员会(简称发审委)倾向于显著地降低发审通过率,同时规避自身风险,选择财务指标良好的低风险企业(营业收入增长高的企业),而回避高风险但可能具有发展潜力的企业(研发费用高的企业)。其次,在从严审核时期,拟上市企业承担了更多的IPO费用以提高IPO审核通过率。此外,相较非"大发审委"时期的过会企业,"大发审委"审核通过的企业更可能出现业绩变脸,这样的审核标准忽略了企业未来的成长性和发展潜力,没有得到投资者的认同,市场表现也更差。
基金funded by the grants from the National Social Science Foundation of China(No.06BJY016)the National Natural Science Foundation of China(No.70772101)the Major Project of Key Research Base on Humanities and Social Science of Ministry of Education of China(No.07JJD630007)
文摘In emerging markets, the deviation between the ultimate controlling shareholders' voting rights and their cash flow rights(hereafter "DVC") in the listed firms is quite prevalent. DVC could be introduced due to the ultimate controlling shareholders' opportunistic incentives, as well as by their incentives to improve firm efficiency. This study uses 229 listed firms ultimately controlled by individuals or families(hereafter "entrepreneurial firms") for 2004 in China, to investigate the effect of DVC on firm value and to determine whether it is different between founder and non-founder controlled firms. We find that DVC has a positive effect on firm value for founder controlled firms. This result implies that investors believe that their interests are better protected by founder controlled firms than by non-founder controlled firms.
基金Acknowledgements This study was supported by a grant from the National Natural Science Foundation of China (No. 31400692).
文摘Podoplanin (PDPN) is a mucin-type O-glycoprotein expressed in diverse cell types, such as lymphatic endothelial cells (LECs) in the vascular system and fibroblastic reticular cells (FRCs) in lymph nodes. PDPN on LECs or FRCs activates CLEC-2 in platelets, triggering platelet activation and/or aggregation through downstream signaling events, including activation of Syk kinase. This mechanism is required to initiate and maintain separation of blood and lymphatic vessels and to stabilize high endothelial venule integrity within lymph nodes. In the vascular system, normal expression of PDPN at the LEC surface requires transcriptional activation of Pdpn by Proxl and modification of PDPN with core 1-derived O-glycans. This review provides a comprehensive overview of the roles of PDPN in vascular development and lymphoid organ maintenance and discusses the mechanisms that regulate PDPN expression related to its function.
文摘We examine the effectiveness of China’s IFRS adoption from the perspective of an important set of financial report users, foreign institutional investors. We find that foreign institutional investment does not increase after China’s IFRS adoption, and some evidence that it actually declines, particularly among firms with weaker incentives to credibly implement IFRS, or with greater ability to manipulate IFRS’s fair value provisions. We also find that the association between earnings and returns generally declines after IFRS adoption, consistent with reduced earnings quality. In addition, we find that foreign institutional investors’ returns decrease after China’s IFRS adoption. Finally, the decline in foreign institutional investment is greater among investors from countries with weak institutions that have also adopted IFRS. Taken together, our evidence suggests that the weak institutional infrastructure in China’s transitional economy impairs IFRS’s intended goal of attracting institutional investment through improved financial reporting quality. Further, financial information users’ home country institutions and IFRS adoption experience affect the effectiveness of IFRS adoption.
基金The research has been supported by the National Natural Science Foundation of China (11561004), the Development for Local Colleges and Universities Foundation of China - the Applied Mathematics Innovative Team Building, and the Bidding Project of Gannan Normal University (16zb02).