It is reported from NRCCRM (the National Research Center for CRMs) that, China has presently developed 1262 kinds of grade A reference materials and 1739 grade B reference materials, involving the fields of the steel,...It is reported from NRCCRM (the National Research Center for CRMs) that, China has presently developed 1262 kinds of grade A reference materials and 1739 grade B reference materials, involving the fields of the steel, the geology, the petroleum, the nuclear material, the environment, the food and the clinical inspection,and etc. The reference materials play an important role in controlling the production quality, maintaining the market order and promoting the scientific and technological advancement.展开更多
5-1',1'-dimethylundecenyloxyphenylmethyl-11,17,23-tris-1 '',1 ''-dimethylethyl-25,26,27,28-tetrahydroxycalix[4] arene was synthesized from 1,1-dimethylundecenyoxylphenylmethylphenol (3) and bis...5-1',1'-dimethylundecenyloxyphenylmethyl-11,17,23-tris-1 '',1 ''-dimethylethyl-25,26,27,28-tetrahydroxycalix[4] arene was synthesized from 1,1-dimethylundecenyoxylphenylmethylphenol (3) and bishydroxymethylated p-tert-butylphenol-formaldehyde trimer (7) (3-[3-[3-(Hydroxymethyl)-tert-butylsalicyl-5]-tert-butylsalicy]-5-tert-butyl-2-hydroxybenzyl Alcohol) by '1+3' fragment condensation in dioxane with TiCl4 as condensation agent in 28% yield. It is the first long-chain monoalkenyl substituted calix[4]arene in which the alkenyl was attached to the upper rim of calix[4]arene.展开更多
Nowadays,the Chinese market is full of imported farming products,including products such as Thai rice,Vietnamese durian,Australian fresh meat.In the meantime,China’s special farming products also appear on the overse...Nowadays,the Chinese market is full of imported farming products,including products such as Thai rice,Vietnamese durian,Australian fresh meat.In the meantime,China’s special farming products also appear on the overseas dining table.Utilizing both the domestic and overseas markets and resources,China’s farming has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
Up to now, there are nearly 200 enterprises in China having passed the product certification of environmental protection, which is of national grade and involves thousands kinds of products. A commissioner of CNCA (Ce...Up to now, there are nearly 200 enterprises in China having passed the product certification of environmental protection, which is of national grade and involves thousands kinds of products. A commissioner of CNCA (Certification and Accreditation Administration of the People’ s Republic of China) introduced on Nov. 2nd, 2004, that the product certification of environmental protection, as the third party evaluation system, provided the market of environmental protection industry with unitary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
A woman imperiously demanded a colonel s commission for her son.Speaking arrogantlyand endlessly,she told Lincoln,“Mr.President,you should know this.My grandfather foughtat Lexington,my father fought at New Orleans,a...A woman imperiously demanded a colonel s commission for her son.Speaking arrogantlyand endlessly,she told Lincoln,“Mr.President,you should know this.My grandfather foughtat Lexington,my father fought at New Orleans,and my husband laid down his life for our coun-try at Monterrey,so...”“Of course, I know this well, madam,”Lincoln interrupted the wom-展开更多
文摘It is reported from NRCCRM (the National Research Center for CRMs) that, China has presently developed 1262 kinds of grade A reference materials and 1739 grade B reference materials, involving the fields of the steel, the geology, the petroleum, the nuclear material, the environment, the food and the clinical inspection,and etc. The reference materials play an important role in controlling the production quality, maintaining the market order and promoting the scientific and technological advancement.
文摘5-1',1'-dimethylundecenyloxyphenylmethyl-11,17,23-tris-1 '',1 ''-dimethylethyl-25,26,27,28-tetrahydroxycalix[4] arene was synthesized from 1,1-dimethylundecenyoxylphenylmethylphenol (3) and bishydroxymethylated p-tert-butylphenol-formaldehyde trimer (7) (3-[3-[3-(Hydroxymethyl)-tert-butylsalicyl-5]-tert-butylsalicy]-5-tert-butyl-2-hydroxybenzyl Alcohol) by '1+3' fragment condensation in dioxane with TiCl4 as condensation agent in 28% yield. It is the first long-chain monoalkenyl substituted calix[4]arene in which the alkenyl was attached to the upper rim of calix[4]arene.
文摘Nowadays,the Chinese market is full of imported farming products,including products such as Thai rice,Vietnamese durian,Australian fresh meat.In the meantime,China’s special farming products also appear on the overseas dining table.Utilizing both the domestic and overseas markets and resources,China’s farming has
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.
文摘Up to now, there are nearly 200 enterprises in China having passed the product certification of environmental protection, which is of national grade and involves thousands kinds of products. A commissioner of CNCA (Certification and Accreditation Administration of the People’ s Republic of China) introduced on Nov. 2nd, 2004, that the product certification of environmental protection, as the third party evaluation system, provided the market of environmental protection industry with unitary
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A woman imperiously demanded a colonel s commission for her son.Speaking arrogantlyand endlessly,she told Lincoln,“Mr.President,you should know this.My grandfather foughtat Lexington,my father fought at New Orleans,and my husband laid down his life for our coun-try at Monterrey,so...”“Of course, I know this well, madam,”Lincoln interrupted the wom-
