检索结果-南通市图书馆

Studies on the Cloud Points of Nonionic Surfactants with QSPR

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第6期23卷 715-719页

作者： CHEN Mei-ling WANG Zheng-wu zhang ge-xin GU Jin CUN Zhe TAO Fu-ming School of Chemistry and Materials Engineering Southern Yangtze University Wuxi 214122 P. R. China Department of Food Science ＆ Technology School of Agriculture and Biology Shanghai Jiaotong University Shanghai 201101 P. R. China Department of Chemistry and Biochemistry California State University Fullerton CA 92834 USA

With quantum chemical parameters, topological indexes, and physical chemistry parameters as descriptors, a quantitative structure-property relationship（QSPR） has been found for the cloud points of four series of nonionic surfactants（ a total of 65 surfactants）. The best-regressed model includes six descriptors, and the correlation coefficient of multiple determination is as high as 0. 962.

关键词： Nonionic surfactants Cloud point Quantitative structure-property relationship

Copper-Catalyzed Asymmetric Hydroamination:A Unified Strategy for the Synthesis of Chiralβ-Amino Acid and Its Derivatives

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2021年第7期3卷 1737-1745页

作者： ge zhang Yujie Liang Tao Qin Tao Xiong Shuyu Liu Wei Guan Qian zhang Department of Chemistry Jilin Province Key Laboratory of Organic Functional Molecular Design&SynthesisNortheast Normal UniversityChangchun 130024 Department of Chemistry Institute of Functional Material ChemistryNortheast Normal UniversityChangchun 130024 State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032

Catalytic asymmetric aza-Michael represents one of the most convenient and atom-economical approaches for the rapid construction of biologically active chiralβ-amino acid ***,the direct enantioselective addition of nitrogen-based nucleophiles to intrinsically low reactivity ofα,β-unsaturated carboxylic acid,ester,and amide,as well as simpleα,β-unsaturated nitrile,remains a long-standing challenge.

关键词： asymmetric catalysis reversal hydroamination chiralβ-amino acid and its derivatives copper catalysis Michael acceptors

Preparation of green cellulose diacetate-based antibacterial wound dressings for wound healing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2022年第2期16卷 83-97页

作者： Chuang XIAO ge zhang Wencheng LIANG Zhaochuang WANG Qiaohui LU Weibin SHI Yan ZHOU Yong GUAN Meidong LANG Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and Technology130 Meilong RoadShanghai 200237China State Key Laboratory of Bioreactor Engineering School of BiotechnologyEast China University of Science and Technology130 Meilong RoadShanghai 200237China Department of general Surgery Xinhua HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200092China

Managing wounds is a growing universal problem and developing effective wound dressings to staunch bleeding and protect wounds from bacterial infections is an increasingly serious *** this work,a remolding electrospinning nanofiber three-dimensional structure wound dressing(CCP)was prepared with superhydrophilicity,high water absorption and absorbing capacity,excellent hemostatic capacity and antibacterial ability,and biocompatibility to promote wound *** guanidine hydrochloride(PHMG)was grafted to cellulose diacetate(CDA)wound dressing surface through an amide reaction.A water contact angle analysis demonstrated that CCP wound dressing could be beneficial to promote wound exudate management effectively with rapid absorption of water within 0.2 *** vitro hemo-and cytocompatibility assay showed that a CCP wound dressing had no significant hemotoxicity or ***,CCP wound dressings could be beneficial to accelerate wound hemostasis and further reduce mortality caused by uncontrolled ***,CCP wound dressings have an excellent antibacterial ability,which could be beneficial to inhibit wound inflammatory over-reaction and promote normal wound *** together,the prepared wound dressing in this research effort is expected to have high-potential in clinical applications.

关键词： cellulose diacetate electrospinning antibacterial performance hemostasis wound dressing

Evaluation of urban underground space resources using a negative list method: Taking Xi'an City as an example in China

在线全文

学校读者我要写书评

暂无评论

China geology 2020年第1期3卷 124-136页

作者： Mao-sheng zhang Hua-qi Wang Ying Dong Lin Li Ping-ping Sun ge zhang Shaanxi Province Engineering Research Centre of Water Resources and Environment Xi'an Center of China Geological SurveyMinistry of Natural ResourcesXi'an 710054China

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources,and to optimize the structure and pattem of the *** is also very important to improve the city environment,build livable city and increase the capacity of the *** on the analysis of existing evaluation methods and their problems,a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed,to be primarily used in urban planning stages.A list of the adverse factors is established,including limiting factors,constraining factors and influencing *** Xi'an as an example,using a geographical information system platform,a negative list of adverse factors for the underground space resources in Xi'an City are evaluated,and preventive measures are *** resources,exploitable resources,and the potential growth of exploitable underground space resources are *** space assessment in the different development stages of the city,collaborative utilization and safety evaluation for multiple subsurface resources,environmental impact and assessment,as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.

关键词： Urban geology Negative list Natural resources for underground space Exploitable resources for underground space 3D geological structure model GIS platform Urban geological survey engineering Xi'an City Shaanxi Province China

Homo-harringtonine,highly effective against coronaviruses,is safe in treating COVID-19 by nebulization

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第6期65卷 1263-1266页

作者： Huajuan Ma Haijun Wen Yaoxu Qin Shijie Wu ge zhang Chung-I Wu Qichun Cai Cancer Center Clifford HospitalJinan UniversityGuangzhou 511495China State Key Laboratory of Biocontrol School of Life SciencesSouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Sun Yat-sen UniversityGuangzhou 510275China

Dear Editor,Coronaviruses have increasingly become the causal agent of epidemics in humans as well as in domesticated animals(Perlman and Mc Intosh,2020;Wu et al.,2021).Since the beginning of this century,there have b... 详细信息

关键词： Perl agent COV

17β-Estradiol Regulates Cultured Immature Boar Sertoli Cell Proliferation via the cAMP-ERK1/2 Pathway and the Estrogen Receptor β

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第8期9卷 1201-1210页

作者： WANG Xian-zhong ZHAO Bo-chuan ZHOU Yu-lan ZHOU Yin-tao MA Kai-ge zhang Jia-hua Chongqing Key Laboratory of Forage ＆ Herbivore College of Animal Science and Technology Southwest University Chongqing 400716P.R. China

Estrogen plays an important role in regulating Sertoli cell number in the testis. The objective of the study was to identify whether 17β-estradiol affected the proliferation of cultured, immature boar Sertoli cells via the estrogen receptor β （ERβ） and the cAMP-extracellular signal-regulated kinase （ERK1/2） pathway. Low levels （10-10-10-8 mol L-1） of 17β-estradiol increased cell number, but high levels （10-7-10-6 mol L-1） decreased it （P〈0.05）. Sertoli cell number began to recover for an additional 24 h in the medium without 17β-estradiol （10-6 mol L-l）（P〉0.05）. The effects of 17β-estradiol （10-9 mol L-1） peaked at the first 24 h （P〈0.05）. 17β-estradiol activated ERK1/2 from 5 min to 24 h, but the activiy of ERK1/2 began to decrease after 4 h. Both PD98059 and U0126, two ERK inhibitors, blocked cell division （P〈0.05）. 17β-estradiol （10-10-10-6 mol L-1） dose-dependently increased cAMP production （P 〈 0.05）, and both 17β-estradiol （10-9 mol L-1） and forskolin, which increases cAMP levels, induced cell proliferation and activated ERK1/2 （P〈 0.05）. Rp-cAMP, an antagonist of cAMP, blocked this 17β-estradiol activity （P〈 0.05）. Two estrogen receptor antagonists, ICI 182780 and ERβ antagonist （ERβAnt）, reduced Sertoli cell number, cAMP production and ERK1/2 activation （P〈 0.05）, but ERaAnt did not （P〉 0.05）. Therefore, 17β- estradiol mainly promotes pig Sertoli cell proliferation via ERβ to induce cAMP production and ERK activation to promote cell proliferation.

关键词： 17β-estradiol Sertoli cell cell proliferation estrogen receptor ERK1/2

The Path Dependence of Enterprise Strategic Adjustment and Its Transcendence Analysis

在线全文

学校读者我要写书评

暂无评论

经济管理学刊（中英文版） 2019年第2期8卷 193-196页

作者： ge zhang Qinghai Province Qinghai Nationalities University XiningQinghai

The world today is in a period of great development and integration of economy,information,and technology,especially the high-tech industries represented by big data,cloud computing,and artificial *** is promoting the rapid increase of human productivity and leading the changes in various *** are facing more and more uncertain external *** previous organizational strategy,personnel structure,and operating strategies have been unable to adapt to the turbulent external environment,and innovation has become the ***,how to find an innovative breakthrough point on the original strategic road on which to survive has become a matter of life and *** the perspective of path dependence theory,this paper analyzes the characteristics of path dependence and transcendence path dependence during the adjustment of corporate strategy,and analyzes the internal causes and mechanisms of its generation with the help of the PEST *** on this,the negative impact of path dependence on the adjustment of the strategy was ***,it was found above that the degree of transcendence path dependence in corporate strategic adjustment is determined by two factors:its ability to drive independent innovation in a dynamic environment and its ability to transform ***,according to the research conclusions,it proposes countermeasures to overcome the path dependence of enterprises when adjusting their strategies,and provides suggestions for companies to find breakthrough points in disruptive innovation.

关键词： Path Dependence Transcendence Path Dependence Enterprise Strategic Adjustment Independent Innovation Transformation

Novel Quantum genetic Algorithm and Its Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Electrical and Electronic Engineering in China 2006年第1期1卷 31-36页

作者： zhang ge-xiang LI Na JIN Wei-dong HU Lai-zhao School of Electrical Engineering Southwest Jiaotong UniversityChengdu 610031China National EW Laboratory Chengdu 610036China

By introducing strong parallelism of quantum computing into evolutionary algorithm,a novel quantum genetic algorithm(NQGA)is *** NQGA,a novel approach for updating the rotation angles of quantum logic gates and a strategy for enhancing search capability and avoiding premature convergence are *** typical complex continuous functions are chosen to test the performance of ***,NQGA is applied in selecting the best feature subset from a large number of features in radar emitter signal *** testing and experimental results of feature selection show that NQGA presents good search capability,rapid convergence,short computing time,and ability to avoid premature convergence effectively.

关键词： genetic algorithm quantum genetic algorithm feature selection recognition

The Path Dependence of Enterprise Strategic Adjustment and Its Transcendence Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

经济管理学刊（中英文版） 2020年第1期9卷 37-40页

作者： ge zhang Qinghai Province Qinghai Nationalities University XiningQinghai

关键词： Path Dependence Transcendence Path Dependence Enterprise Strategic Adjustment Independent Innovation Transformation