Gravitational waves emanating from binary neutron star inspirals,alongside electromagnetic transients resulting from the aftermath of the GW170817 merger,have been successfully detected.However,the intricate post-merg...Gravitational waves emanating from binary neutron star inspirals,alongside electromagnetic transients resulting from the aftermath of the GW170817 merger,have been successfully detected.However,the intricate post-merger dynamics that bridge these two sets of observables remain enigmatic.This includes if,and when,the post-merger remnant star collapses to a black hole,and what are the necessary conditions to power a short gamma-ray burst,and other observed electromagnetic counterparts.Our focus is on the detection of gravitational wave(GW)emissions from hyper-massive neutron stars(NSs)formed through binary neutron star(BNS)mergers.Utilizing several kilohertz GW detectors,we simulate BNS mergers within the detection limits of LIGO-Virgo-KARGA O4.Our objective is to ascertain the fraction of simulated sources that may emit detectable post-merger GW signals.For kilohertz detectors equipped with a new cavity design,we estimate that approximately 1.1%-32%of sources would emit a detectable post-merger GW signal.This fraction is contingent on the mass converted into gravitational wave energy,ranging from 0.01M_(sun)to 0.1M_(sun).Furthermore,by evaluating other well-regarded proposed kilohertz GW detectors,we anticipate that the fraction can increase to as much as 2.1%-61%under optimal performance conditions.展开更多
Corporate mergers and acquisitions(M&As)are subject to skewed logic due to excessive government regulation.China is progressively adopting the Market Access Negative List(MANL)pilot to transfer the power of resour...Corporate mergers and acquisitions(M&As)are subject to skewed logic due to excessive government regulation.China is progressively adopting the Market Access Negative List(MANL)pilot to transfer the power of resource allocation from the government to the market.Using the DID method,we examine the impact of relaxing market access regulation on firms’M&A behavior against China’s institutional background and the M&A events of listed companies from 2012 to 2019.The MANL significantly increases firms’M&A tendency and amount and strengthens the competitive adequacy and fairness of market-oriented M&A decisions.Post-M&A financial performance does not increase,but human capital productivity,innovation effectiveness and total factor productivity do,demonstrating the dynamic balance of profit and efficiency in M&As.展开更多
The aim of this paper is to verify if the M＆As implemented in the past decade in the banking sector have created value for shareholders. For this purpose a sample of 72 deals carded out during the period of 1994-2005...The aim of this paper is to verify if the M＆As implemented in the past decade in the banking sector have created value for shareholders. For this purpose a sample of 72 deals carded out during the period of 1994-2005 were examined using the ＂event study＂ methodology. These deals were subdivided into three sections： acquisitions, mergers and M＆As. The results obtained seem to suggest a creation of value for the target companies and a destruction of value for the bidders in all three cases. From the analysis of the combined values, on the other hand, a significant destruction of value is deduced in both mergers and in M＆As.展开更多
基金supported by the National Natural Science Foundation of China(6127509961371164)+2 种基金the Natural Science Foundation of Chongqing(CSTC2012JJA40008)the Research Project of Chongqing Educational Commission(KJ120525KJ130524)
基金supported by the National Natural Science Foundation of China (Grant Nos.12021003,11920101003,and 11633001)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDB23000000)。
文摘Gravitational waves emanating from binary neutron star inspirals,alongside electromagnetic transients resulting from the aftermath of the GW170817 merger,have been successfully detected.However,the intricate post-merger dynamics that bridge these two sets of observables remain enigmatic.This includes if,and when,the post-merger remnant star collapses to a black hole,and what are the necessary conditions to power a short gamma-ray burst,and other observed electromagnetic counterparts.Our focus is on the detection of gravitational wave(GW)emissions from hyper-massive neutron stars(NSs)formed through binary neutron star(BNS)mergers.Utilizing several kilohertz GW detectors,we simulate BNS mergers within the detection limits of LIGO-Virgo-KARGA O4.Our objective is to ascertain the fraction of simulated sources that may emit detectable post-merger GW signals.For kilohertz detectors equipped with a new cavity design,we estimate that approximately 1.1%-32%of sources would emit a detectable post-merger GW signal.This fraction is contingent on the mass converted into gravitational wave energy,ranging from 0.01M_(sun)to 0.1M_(sun).Furthermore,by evaluating other well-regarded proposed kilohertz GW detectors,we anticipate that the fraction can increase to as much as 2.1%-61%under optimal performance conditions.
基金support obtained from the National Natural Science Foundation of China(Project No.72172156/G0206)for this study.
文摘Corporate mergers and acquisitions(M&As)are subject to skewed logic due to excessive government regulation.China is progressively adopting the Market Access Negative List(MANL)pilot to transfer the power of resource allocation from the government to the market.Using the DID method,we examine the impact of relaxing market access regulation on firms’M&A behavior against China’s institutional background and the M&A events of listed companies from 2012 to 2019.The MANL significantly increases firms’M&A tendency and amount and strengthens the competitive adequacy and fairness of market-oriented M&A decisions.Post-M&A financial performance does not increase,but human capital productivity,innovation effectiveness and total factor productivity do,demonstrating the dynamic balance of profit and efficiency in M&As.
文摘The aim of this paper is to verify if the M＆As implemented in the past decade in the banking sector have created value for shareholders. For this purpose a sample of 72 deals carded out during the period of 1994-2005 were examined using the ＂event study＂ methodology. These deals were subdivided into three sections： acquisitions, mergers and M＆As. The results obtained seem to suggest a creation of value for the target companies and a destruction of value for the bidders in all three cases. From the analysis of the combined values, on the other hand, a significant destruction of value is deduced in both mergers and in M＆As.
