Four 9-halo prostaglandin derivatives were designed and synthesized. Their structures were confirmed by IR,~1HNMR, MS, etc. The effect on uterus contraction of ratswas studied in vitro. It was found that compound g-Br...Four 9-halo prostaglandin derivatives were designed and synthesized. Their structures were confirmed by IR,~1HNMR, MS, etc. The effect on uterus contraction of ratswas studied in vitro. It was found that compound g-Br seemed to be the most sensitive andγ-Cl somewhat less, while a-Cl and a-Br had almost no action as compared with oxytocin(1 IU/ml).展开更多
Past eccentric contraction (ECC)-induced muscle injury reduces the severity of symptoms of subsequent muscle injury;this phenomenon is known as a repeated bout effect (RBE). It has been reported that increases in the ...Past eccentric contraction (ECC)-induced muscle injury reduces the severity of symptoms of subsequent muscle injury;this phenomenon is known as a repeated bout effect (RBE). It has been reported that increases in the duration of the interval between the first and second bouts are linked to weakening of the RBE. However, the histology following the attenuation of the RBE remains unclear. We examined the sustained effects of the second bout with regard to myofiber permeability and muscle force. Sixty-four male rats were randomly assigned to eight groups that varied in the number of exercise sessions and the duration of the interval between the first and second bouts: the non-ECC (Control);the single-injury (Post 1st bout);groups that were allowed to recover for 1, 2, and 4 weeks after a single injury (Pre 2nd bout_1w, Pre 2nd bout_2w, and Pre 2nd bout_4w);and groups that were subjected to second injuries 1, 2, and 4 weeks after the first (Post 2nd bout_1w, Post 2nd bout_2w, and Post 2nd bout_4w). The tibialis anterior was electrically stimulated in each ECC group. Twenty-four hours before muscle sampling, Evans blue dye (EBD) (a marker of myofiber damage) was administered. The maximal isometric contraction tension was measured immediately before sampling. The number of EBD-positive (+) fibers was determined via histological analysis. An RBE was revealed by functional examination at the 1- and 2-week and histological examination at the 1-, 2-, and 4-week time points (P < 0.05). In terms of myofiber permeability, prolongation of the interval before the second bout weakened this effect (P < 0.05). Experiments with 1-, 2-, and 4-week intervals indicated that prolongation of the interval before the second bout weakened the RBE with regard to myofiber permeability.展开更多
Using micro-level data from China Employer-Employee Survey(CEES), this paper conducts an empirical analysis of firms' heterogeneous characteristics in the implementation of the Labor Contract Law and its effects o...Using micro-level data from China Employer-Employee Survey(CEES), this paper conducts an empirical analysis of firms' heterogeneous characteristics in the implementation of the Labor Contract Law and its effects on employees. Our findings are as follows: With China's economic development, firms more proactively implement the Labor Contract Law, resulting in a higher percentage of employees with labor contracts. Labor contracts significantly increase the probability of employees in receiving social insurances, such as pension, health, unemployment, work injury and birth insurances, and have a significantly positive effect on wage income. Longer term of labor contract corresponds to stronger employment protection, and such an effect is highly robust. Larger firms with higher capital-labor ratios have better results in implementing the Labor Contract Law. And employees of private and labor-intensive firms have poorer coverage of employment and social protection; such firms should be given focal attention in the law's implementation.展开更多
In previous work, the electron radius was identified as the “actual electron radius.” However, this is more accurately described as the electron radius at rest. This study reexamines the electron with an emphasis on...In previous work, the electron radius was identified as the “actual electron radius.” However, this is more accurately described as the electron radius at rest. This study reexamines the electron with an emphasis on the electron radius under motion, incorporating the effects of length contraction. The findings suggest that the radius is subject to Lorentz contraction, which has interesting implications for relativistic effects at the subatomic level.展开更多
The observable universe together with the observer, both on sufficiently large scale, succeeds in their self-entaglement and paradoxical inconsistency. For consistency, the observable universe and the observer have to...The observable universe together with the observer, both on sufficiently large scale, succeeds in their self-entaglement and paradoxical inconsistency. For consistency, the observable universe and the observer have to be on different scale (size) provided, the cosmological principle is preserved as an approximation in a limit. The point is the univers’ principle itself. Our proposal for the disentaglement is superimposition out of complexity. The distance contraction, as observed in electrical soundings over horizontally stratified earth (static system), is identified as a counterpart of Doppler shift in dynamical systems. An alternative answer to the question about an effective cause of the Doppler shift sounds the heterogeneities under superimposing scales. The energy propagating in stratified universe exhibits a shift which could be attributed not only to the expansion but alternatively to fluctuations across different scales. When nothing is said or predetermined about kinematics of a system, both causes might share in the effect. It opens different static and kinematic possibilities, which challenge established theories of energy/information transmission and/or sounding at a distance as well as pertinent technology in prospect.展开更多
CEO compensation stickiness represents an important indicator to measure the effectiveness of compensation contracts.This study uses CEO career experience data and compensation stickiness data from Shanghai and Shenzh...CEO compensation stickiness represents an important indicator to measure the effectiveness of compensation contracts.This study uses CEO career experience data and compensation stickiness data from Shanghai and Shenzhen A-share listed companies from 2015 to 2020 to investigate the compensation contracts’effectiveness of CEOs with diverse career experiences.The findings are as follows:1)Compensation stickiness is more pronounced for CEOs with diverse career experiences.According to the mechanism test,these CEOs with diverse career experiences can obtain compensation incentives by reducing corporate uncertainty perception and improving total factor productivity.This approach leads to increased compensation stickiness and the effectiveness of compensation contracts.CEOs with diverse career experiences may receive excess compensation by raising agency costs,which intensifies compensation stickiness and weakens the effectiveness of compensation contracts.2)Compensation stickiness of CEOs with diverse career experiences is more significant in companies with lower investor protection,which brings about less effective compensation contracts.In contrast,in companies with higher diversification,the compensation stickiness of CEOs with diverse career experiences is more significant,which delivers more effective compensation contracts.The conclusions deepen the research of CEO compensation contracts and provide a helpful reference for CEO compensation management practices.展开更多
文摘Four 9-halo prostaglandin derivatives were designed and synthesized. Their structures were confirmed by IR,~1HNMR, MS, etc. The effect on uterus contraction of ratswas studied in vitro. It was found that compound g-Br seemed to be the most sensitive andγ-Cl somewhat less, while a-Cl and a-Br had almost no action as compared with oxytocin(1 IU/ml).
文摘Past eccentric contraction (ECC)-induced muscle injury reduces the severity of symptoms of subsequent muscle injury;this phenomenon is known as a repeated bout effect (RBE). It has been reported that increases in the duration of the interval between the first and second bouts are linked to weakening of the RBE. However, the histology following the attenuation of the RBE remains unclear. We examined the sustained effects of the second bout with regard to myofiber permeability and muscle force. Sixty-four male rats were randomly assigned to eight groups that varied in the number of exercise sessions and the duration of the interval between the first and second bouts: the non-ECC (Control);the single-injury (Post 1st bout);groups that were allowed to recover for 1, 2, and 4 weeks after a single injury (Pre 2nd bout_1w, Pre 2nd bout_2w, and Pre 2nd bout_4w);and groups that were subjected to second injuries 1, 2, and 4 weeks after the first (Post 2nd bout_1w, Post 2nd bout_2w, and Post 2nd bout_4w). The tibialis anterior was electrically stimulated in each ECC group. Twenty-four hours before muscle sampling, Evans blue dye (EBD) (a marker of myofiber damage) was administered. The maximal isometric contraction tension was measured immediately before sampling. The number of EBD-positive (+) fibers was determined via histological analysis. An RBE was revealed by functional examination at the 1- and 2-week and histological examination at the 1-, 2-, and 4-week time points (P < 0.05). In terms of myofiber permeability, prolongation of the interval before the second bout weakened this effect (P < 0.05). Experiments with 1-, 2-, and 4-week intervals indicated that prolongation of the interval before the second bout weakened the RBE with regard to myofiber permeability.
文摘Using micro-level data from China Employer-Employee Survey(CEES), this paper conducts an empirical analysis of firms' heterogeneous characteristics in the implementation of the Labor Contract Law and its effects on employees. Our findings are as follows: With China's economic development, firms more proactively implement the Labor Contract Law, resulting in a higher percentage of employees with labor contracts. Labor contracts significantly increase the probability of employees in receiving social insurances, such as pension, health, unemployment, work injury and birth insurances, and have a significantly positive effect on wage income. Longer term of labor contract corresponds to stronger employment protection, and such an effect is highly robust. Larger firms with higher capital-labor ratios have better results in implementing the Labor Contract Law. And employees of private and labor-intensive firms have poorer coverage of employment and social protection; such firms should be given focal attention in the law's implementation.
文摘In previous work, the electron radius was identified as the “actual electron radius.” However, this is more accurately described as the electron radius at rest. This study reexamines the electron with an emphasis on the electron radius under motion, incorporating the effects of length contraction. The findings suggest that the radius is subject to Lorentz contraction, which has interesting implications for relativistic effects at the subatomic level.
文摘The observable universe together with the observer, both on sufficiently large scale, succeeds in their self-entaglement and paradoxical inconsistency. For consistency, the observable universe and the observer have to be on different scale (size) provided, the cosmological principle is preserved as an approximation in a limit. The point is the univers’ principle itself. Our proposal for the disentaglement is superimposition out of complexity. The distance contraction, as observed in electrical soundings over horizontally stratified earth (static system), is identified as a counterpart of Doppler shift in dynamical systems. An alternative answer to the question about an effective cause of the Doppler shift sounds the heterogeneities under superimposing scales. The energy propagating in stratified universe exhibits a shift which could be attributed not only to the expansion but alternatively to fluctuations across different scales. When nothing is said or predetermined about kinematics of a system, both causes might share in the effect. It opens different static and kinematic possibilities, which challenge established theories of energy/information transmission and/or sounding at a distance as well as pertinent technology in prospect.
基金the National Social Science Fund of China,under grant No.21BGL017.
文摘CEO compensation stickiness represents an important indicator to measure the effectiveness of compensation contracts.This study uses CEO career experience data and compensation stickiness data from Shanghai and Shenzhen A-share listed companies from 2015 to 2020 to investigate the compensation contracts’effectiveness of CEOs with diverse career experiences.The findings are as follows:1)Compensation stickiness is more pronounced for CEOs with diverse career experiences.According to the mechanism test,these CEOs with diverse career experiences can obtain compensation incentives by reducing corporate uncertainty perception and improving total factor productivity.This approach leads to increased compensation stickiness and the effectiveness of compensation contracts.CEOs with diverse career experiences may receive excess compensation by raising agency costs,which intensifies compensation stickiness and weakens the effectiveness of compensation contracts.2)Compensation stickiness of CEOs with diverse career experiences is more significant in companies with lower investor protection,which brings about less effective compensation contracts.In contrast,in companies with higher diversification,the compensation stickiness of CEOs with diverse career experiences is more significant,which delivers more effective compensation contracts.The conclusions deepen the research of CEO compensation contracts and provide a helpful reference for CEO compensation management practices.
