By using Schwarz alternating method, this paper presents asimplified alternating algorithm for the problems of two holes having arbitrary shapes and arrangements in an isotropic homogeneous linear elastic infinite reg...By using Schwarz alternating method, this paper presents asimplified alternating algorithm for the problems of two holes having arbitrary shapes and arrangements in an isotropic homogeneous linear elastic infinite region, and obtains stress and displacement fields for random times of iteration. After precision analysis it is found that the results for twenty times of iteration are of very high precision, and those with higher precision can be acquired if the iteration solving is further conducted. The comparison of the results from FEM further proves the reliability of the simplified alternating algorithm presented by this paper.展开更多
[ Objective] To study the effects of clindamycin on germ cells of male mice. [Method] A total of 48 healthy adult male mice were randomly divided into group A, group B, group C and control group, 12 mice in each group...[ Objective] To study the effects of clindamycin on germ cells of male mice. [Method] A total of 48 healthy adult male mice were randomly divided into group A, group B, group C and control group, 12 mice in each group. The mice in the group A, group B and group C were respectively administrated with clindamycin at doses of 15, 30 and 60 mg/kg.d via intraperitoneai injection, and those in the control group were trea- ted with normal saline. On Day 29 after administration, the mice were killed by dislocation, and the sperm motility rate, sperm deformity rate and the percentage of sperm having swollen tail membrane were determined, respectively. [ Result] The sperm motility rate and the percentage of sperm having swollen tail membrane of the group B and group C were lower than those of the control group; and the sperm deformity rate of the group B and group C was higher than that of the control group. The sperm motility rate, sperm deformity rate and percentage of sperm having swollen tail membrane had no significant difference between the group A and control group. [ Conclusion] The clindamycin at a dose equal to or more than that used for severe infection affects the normal function of sperm in mice.展开更多
Let X be a compact subset of an interval [a, b] (a.b≥0), fa continuous function defined on X,and the set of algebraic polynomials having bounded coefficients.The paper gives an alternating characterization theorem of...Let X be a compact subset of an interval [a, b] (a.b≥0), fa continuous function defined on X,and the set of algebraic polynomials having bounded coefficients.The paper gives an alternating characterization theorem of a polynomial of best uniform approximation to f from K,and a de La Vallee-Poussin theorem.展开更多
After choosing weight functions suitably, we define a Banach spaceH ω μ (L) and discuss the generalized inverse of singular integral operators on an open arc. Using the generalized inverse, we obtain the solutions f...After choosing weight functions suitably, we define a Banach spaceH ω μ (L) and discuss the generalized inverse of singular integral operators on an open arc. Using the generalized inverse, we obtain the solutions for the following singular integral equation展开更多
Laozi’s concept of desire has rich ideological connotations,not only referring to reducing personal desires.Laozi’s concept of desire is based on“desire”as human nature,acknowledging the legitimacy and necessity o...Laozi’s concept of desire has rich ideological connotations,not only referring to reducing personal desires.Laozi’s concept of desire is based on“desire”as human nature,acknowledging the legitimacy and necessity of desire and demand.The rational criticism of“having desire”formed by“no desire”is the value pursuit of Laozi’s concept of desire.From both personal physical and mental aspects and social order,“no desire”plays an important guiding role.Nature is the essence of Laozi’s concept of desire,and being in harmony with nature is the best state of desire.Laozi’s concept of desire reveals a deep spirit of love,and the“ethics of love”highlights Laozi’s strong sense of care for the“other”and ethical attitude towards responsibility.Laozi’s contemplation of desire contains a strong humanistic spirit,with the aim of promoting the healthy and sustainable development of life and society.展开更多
The relaxation of fertility policy in China makes it possible to observe and under-stand the patterns of childbearing behavior in low fertility settings.This paper takes Shanghai,a city with ultra-low fertility over t...The relaxation of fertility policy in China makes it possible to observe and under-stand the patterns of childbearing behavior in low fertility settings.This paper takes Shanghai,a city with ultra-low fertility over the long term,as an example to analyze families who have had a second child since the adjustment of China’s fertility policy.The paper reports the major results of a survey of couples with Shanghai house-hold registration(hukou)who have had a second child,and makes comparisons with other relevant survey.It seeks to answer the question"Who are the couples giving birth to second child?"The results show that most of the women who have had a second child after implementation of the Selective Two-child Policy in 2014 were born in the late 1970s and 1980s.Couples who had higher education levels and higher incomes,and in which the woman worked as a full-time housewife or worked in a less intense job with scheduling flexibility were more likely to have a second child.The ability of a couple to get help from their own parents for childcare,and the gender of the first child also affected the decision to have a second child.This study reveals that couples who have a second child tend to be those with better than average childcare resources.This suggests that formulating reasonable public poli-cies aimed at reducing the cost of childbearing and childrearing would be an effec-tive way to further release fertility potential.展开更多
Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound w...Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.展开更多
G. C. Ying, Y. Y. Meng, B. E. Sagan, and V. R. Vatter [1] found the maximum number of maximal independent sets in connected graphs which contain at most two cycles. In this paper, we give an alternative proof to deter...G. C. Ying, Y. Y. Meng, B. E. Sagan, and V. R. Vatter [1] found the maximum number of maximal independent sets in connected graphs which contain at most two cycles. In this paper, we give an alternative proof to determine the largest number of maximal independent sets among all connected graphs of order n ≥ 12, which contain at most two cycles. We also characterize the extremal graph achieving this maximum value.展开更多
In this paper,we study the existence and local uniqueness of multi-peak solutions to the Kirchhoff type equations-(ε^(2)a+εb∫_(R^(3))|■u|^(2))△u+V(x)u=u^(p),u>0 in R^(3),which concentrate at non-degenerate cri...In this paper,we study the existence and local uniqueness of multi-peak solutions to the Kirchhoff type equations-(ε^(2)a+εb∫_(R^(3))|■u|^(2))△u+V(x)u=u^(p),u>0 in R^(3),which concentrate at non-degenerate critical points of the potential function V(x),where a,b>0,1<p<5 are constants,andε>0 is a parameter.Applying the Lyapunov-Schmidt reduction method and a local Pohozaev type identity,we establish the existence and local uniqueness results of multi-peak solutions,which concentrate at{a_(i)}1≤i≤k,where{a_(i)}1≤i≤k are non-degenerate critical points of V(x)asε→0.展开更多
This paper argues that“the fear of having two sons”is a gender structure phenom-enon that causes anxiety for some Chinese families.To prove the existence of such a fear in some families,this paper considers three as...This paper argues that“the fear of having two sons”is a gender structure phenom-enon that causes anxiety for some Chinese families.To prove the existence of such a fear in some families,this paper considers three aspects:the ideal gender structure of children,women’s childbearing plan for second children and their actual child-bearing behavior.Data for nine provinces is taken from the China Fertility Survey of 2017.This paper finds that:(1)except for having no children,2 sons and 0 daughters is the most undesired gender structure;(2)among those who expect 1 son and 1 daughter,women whose first child is a son are less likely to plan to have a second child than those whose first child is a daughter;(3)among those who expect 1 son and 1 daughter,women with a son as the first child are less likely to have a second child than those with a daughter.These findings prove that,at present,the phenom-enon of the fear of having two sons does exist in some Chinese families.Finally,this paper summarizes how the attitudes of Chinese families towards having sons have changed since the 1950s from“a hope for having many sons”to“a desire for at least one son”and finally to“the fear of having two sons.”The paper also discusses the significance of the fear of having two sons phenomenon in terms of improving the proximate determinants of low fertility model.展开更多
XIE Youyu went to Antarctica in November, 1985. It was the second time that China sent a scientific expedition to the South Pole. On the eve of her Antarctic trip, my colleagues and I visited her. On behalf of all the...XIE Youyu went to Antarctica in November, 1985. It was the second time that China sent a scientific expedition to the South Pole. On the eve of her Antarctic trip, my colleagues and I visited her. On behalf of all the staffers of Women of China, we presented her with a flag bearing the words "Bring Credit to Our Country" and asked her to plant the flag at the South Pole which expressed our concern for China’s research in Antarctica, as well as our respect for Xie and her brave venture. Xie spent four months at展开更多
基金the National Natural Science Foundation of China (Grant No. 49772166).
文摘By using Schwarz alternating method, this paper presents asimplified alternating algorithm for the problems of two holes having arbitrary shapes and arrangements in an isotropic homogeneous linear elastic infinite region, and obtains stress and displacement fields for random times of iteration. After precision analysis it is found that the results for twenty times of iteration are of very high precision, and those with higher precision can be acquired if the iteration solving is further conducted. The comparison of the results from FEM further proves the reliability of the simplified alternating algorithm presented by this paper.
基金supported by the grants from the University Scientific Research Project of Inner Mongolia Autonomous Region (NJzc08159)
文摘[ Objective] To study the effects of clindamycin on germ cells of male mice. [Method] A total of 48 healthy adult male mice were randomly divided into group A, group B, group C and control group, 12 mice in each group. The mice in the group A, group B and group C were respectively administrated with clindamycin at doses of 15, 30 and 60 mg/kg.d via intraperitoneai injection, and those in the control group were trea- ted with normal saline. On Day 29 after administration, the mice were killed by dislocation, and the sperm motility rate, sperm deformity rate and the percentage of sperm having swollen tail membrane were determined, respectively. [ Result] The sperm motility rate and the percentage of sperm having swollen tail membrane of the group B and group C were lower than those of the control group; and the sperm deformity rate of the group B and group C was higher than that of the control group. The sperm motility rate, sperm deformity rate and percentage of sperm having swollen tail membrane had no significant difference between the group A and control group. [ Conclusion] The clindamycin at a dose equal to or more than that used for severe infection affects the normal function of sperm in mice.
文摘Let X be a compact subset of an interval [a, b] (a.b≥0), fa continuous function defined on X,and the set of algebraic polynomials having bounded coefficients.The paper gives an alternating characterization theorem of a polynomial of best uniform approximation to f from K,and a de La Vallee-Poussin theorem.
基金Supported by the National Natural Science Foundation of China( No.2 0 1980 6 33)
文摘After choosing weight functions suitably, we define a Banach spaceH ω μ (L) and discuss the generalized inverse of singular integral operators on an open arc. Using the generalized inverse, we obtain the solutions for the following singular integral equation
文摘Laozi’s concept of desire has rich ideological connotations,not only referring to reducing personal desires.Laozi’s concept of desire is based on“desire”as human nature,acknowledging the legitimacy and necessity of desire and demand.The rational criticism of“having desire”formed by“no desire”is the value pursuit of Laozi’s concept of desire.From both personal physical and mental aspects and social order,“no desire”plays an important guiding role.Nature is the essence of Laozi’s concept of desire,and being in harmony with nature is the best state of desire.Laozi’s concept of desire reveals a deep spirit of love,and the“ethics of love”highlights Laozi’s strong sense of care for the“other”and ethical attitude towards responsibility.Laozi’s contemplation of desire contains a strong humanistic spirit,with the aim of promoting the healthy and sustainable development of life and society.
基金supported by 2019 The National Social Sciences Fund of China(19CRK017):“Study on the new characteristics,causes,influences and trends of marriage behavior of residents in big cities of China”.
文摘The relaxation of fertility policy in China makes it possible to observe and under-stand the patterns of childbearing behavior in low fertility settings.This paper takes Shanghai,a city with ultra-low fertility over the long term,as an example to analyze families who have had a second child since the adjustment of China’s fertility policy.The paper reports the major results of a survey of couples with Shanghai house-hold registration(hukou)who have had a second child,and makes comparisons with other relevant survey.It seeks to answer the question"Who are the couples giving birth to second child?"The results show that most of the women who have had a second child after implementation of the Selective Two-child Policy in 2014 were born in the late 1970s and 1980s.Couples who had higher education levels and higher incomes,and in which the woman worked as a full-time housewife or worked in a less intense job with scheduling flexibility were more likely to have a second child.The ability of a couple to get help from their own parents for childcare,and the gender of the first child also affected the decision to have a second child.This study reveals that couples who have a second child tend to be those with better than average childcare resources.This suggests that formulating reasonable public poli-cies aimed at reducing the cost of childbearing and childrearing would be an effec-tive way to further release fertility potential.
文摘Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.
文摘G. C. Ying, Y. Y. Meng, B. E. Sagan, and V. R. Vatter [1] found the maximum number of maximal independent sets in connected graphs which contain at most two cycles. In this paper, we give an alternative proof to determine the largest number of maximal independent sets among all connected graphs of order n ≥ 12, which contain at most two cycles. We also characterize the extremal graph achieving this maximum value.
基金supported by the Natural Science Foundation of China(11771166,12071169)the Hubei Key Laboratory of Mathematical Sciences and Program for Changjiang Scholars and Innovative Research Team in University#IRT17R46。
文摘In this paper,we study the existence and local uniqueness of multi-peak solutions to the Kirchhoff type equations-(ε^(2)a+εb∫_(R^(3))|■u|^(2))△u+V(x)u=u^(p),u>0 in R^(3),which concentrate at non-degenerate critical points of the potential function V(x),where a,b>0,1<p<5 are constants,andε>0 is a parameter.Applying the Lyapunov-Schmidt reduction method and a local Pohozaev type identity,we establish the existence and local uniqueness results of multi-peak solutions,which concentrate at{a_(i)}1≤i≤k,where{a_(i)}1≤i≤k are non-degenerate critical points of V(x)asε→0.
文摘This paper argues that“the fear of having two sons”is a gender structure phenom-enon that causes anxiety for some Chinese families.To prove the existence of such a fear in some families,this paper considers three aspects:the ideal gender structure of children,women’s childbearing plan for second children and their actual child-bearing behavior.Data for nine provinces is taken from the China Fertility Survey of 2017.This paper finds that:(1)except for having no children,2 sons and 0 daughters is the most undesired gender structure;(2)among those who expect 1 son and 1 daughter,women whose first child is a son are less likely to plan to have a second child than those whose first child is a daughter;(3)among those who expect 1 son and 1 daughter,women with a son as the first child are less likely to have a second child than those with a daughter.These findings prove that,at present,the phenom-enon of the fear of having two sons does exist in some Chinese families.Finally,this paper summarizes how the attitudes of Chinese families towards having sons have changed since the 1950s from“a hope for having many sons”to“a desire for at least one son”and finally to“the fear of having two sons.”The paper also discusses the significance of the fear of having two sons phenomenon in terms of improving the proximate determinants of low fertility model.
文摘XIE Youyu went to Antarctica in November, 1985. It was the second time that China sent a scientific expedition to the South Pole. On the eve of her Antarctic trip, my colleagues and I visited her. On behalf of all the staffers of Women of China, we presented her with a flag bearing the words "Bring Credit to Our Country" and asked her to plant the flag at the South Pole which expressed our concern for China’s research in Antarctica, as well as our respect for Xie and her brave venture. Xie spent four months at
