High-density polyethylene(HDPE)film leakage location detection is frequently accomplished using the double-electrode technique.The electric potential and potential difference are the main physical parameters in the do...High-density polyethylene(HDPE)film leakage location detection is frequently accomplished using the double-electrode technique.The electric potential and potential difference are the main physical parameters in the double-electrode approach.Due to the impact of the complex geoelectric environment,the electric potential and the electric potential difference are not sensitive enough to respond to minimal leakage.The tiny leaking area cannot be precisely located using the electric potential and electric potential difference.Using the COMSOL Multiphysics software,this study created a standard geoelectric model of the double-electrode method.We calculated a new parameter—the G parameter through secondary electric potential difference—based on the response characteristics of the electric potential and the electric potential difference while the HDPEfilm is leaking.The experiment demonstrates that the G parameter is more sensitive than the electric potential and electric potential difference for detecting the leaking area of HDPE film.The G parameter is more effective at detecting leakage than the electric potential and electric potential difference.The results of this study can be used to locate HDPEfilm leakage areas in a landfill.展开更多
The discourse of corporate social views of the role of the firm in a responsibility （CSR） has grown rapidly over the last decade. There are different society and disagreements as to whether wealth maximization shoul...The discourse of corporate social views of the role of the firm in a responsibility （CSR） has grown rapidly over the last decade. There are different society and disagreements as to whether wealth maximization should be the sole goal of a corporation. There is also a debate on whether CSR practices are beneficial for firms. Studies examining the performance of firms that have adopted a CSR policy within a range of sectors in various countries provide inconsistent results. Some studies show excess returns among companies adopting a CSR policy relative to the companies that do not adopt such a policy, while others do not find differences in returns. To further dispel the ambiguity on this issue, the authors explore the relationship between CSR adoption and financial performance of firms＇ shares in Israeli market, with a US market benchmark as a test of specificity. The findings reveal that no significant difference exists between the performance of firms adopting a CSR policy and firms that do not. Thus, the inclusion of investments in socially-responsible firms in an investor＇s portfolio does not appear to significantly impact the portfolio＇s performance. Managers and investors interested in investing in CSR may do so without any concern of the lower returns or performance. This study provides an additional support for the CSR School in that its findings indicate that, on the one hand, investments in firms that integrate social and environmental responsibility are just ＂as good as＂ investments in firms that do not. On the other hand, such investments can be seen as superior, since in addition to the financial returns, investors contribute to changing the face of the global environment and are creating a system for support and enforcement that ensures the existence of a better world for the children in the present and future.展开更多
基金supported by the National Key Research and Development Program of China (Grant Nos. 2019YFC1510802 and 2019YFC1804302)the National Natural Science Foundation of China (Grant No. 41504081)the Fundamental Research Funds for the Central Universities (Grant No. 2019B17214)。
文摘High-density polyethylene(HDPE)film leakage location detection is frequently accomplished using the double-electrode technique.The electric potential and potential difference are the main physical parameters in the double-electrode approach.Due to the impact of the complex geoelectric environment,the electric potential and the electric potential difference are not sensitive enough to respond to minimal leakage.The tiny leaking area cannot be precisely located using the electric potential and electric potential difference.Using the COMSOL Multiphysics software,this study created a standard geoelectric model of the double-electrode method.We calculated a new parameter—the G parameter through secondary electric potential difference—based on the response characteristics of the electric potential and the electric potential difference while the HDPEfilm is leaking.The experiment demonstrates that the G parameter is more sensitive than the electric potential and electric potential difference for detecting the leaking area of HDPE film.The G parameter is more effective at detecting leakage than the electric potential and electric potential difference.The results of this study can be used to locate HDPEfilm leakage areas in a landfill.
文摘The discourse of corporate social views of the role of the firm in a responsibility （CSR） has grown rapidly over the last decade. There are different society and disagreements as to whether wealth maximization should be the sole goal of a corporation. There is also a debate on whether CSR practices are beneficial for firms. Studies examining the performance of firms that have adopted a CSR policy within a range of sectors in various countries provide inconsistent results. Some studies show excess returns among companies adopting a CSR policy relative to the companies that do not adopt such a policy, while others do not find differences in returns. To further dispel the ambiguity on this issue, the authors explore the relationship between CSR adoption and financial performance of firms＇ shares in Israeli market, with a US market benchmark as a test of specificity. The findings reveal that no significant difference exists between the performance of firms adopting a CSR policy and firms that do not. Thus, the inclusion of investments in socially-responsible firms in an investor＇s portfolio does not appear to significantly impact the portfolio＇s performance. Managers and investors interested in investing in CSR may do so without any concern of the lower returns or performance. This study provides an additional support for the CSR School in that its findings indicate that, on the one hand, investments in firms that integrate social and environmental responsibility are just ＂as good as＂ investments in firms that do not. On the other hand, such investments can be seen as superior, since in addition to the financial returns, investors contribute to changing the face of the global environment and are creating a system for support and enforcement that ensures the existence of a better world for the children in the present and future.
