检索结果-南通市图书馆

Effect of rare earth on the coating-forming and mechanism of phosphatization

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2010年第S1期28卷 132-135页

作者：邝钜炽黄莺 Deptment of Chemistry and Chemical Engineering Foshan University School of Chemistry and Chemical Engineering South China University of Technology

It was ascertained that when a RE element was added in bath,the sample was improved on the anti-corrosion power of the coating because of the increasing of covering rate of formless crystal Zn2Fe(PO4) 2·4H2O(marked P) crystals and the ratio of P/(P+H) (H was the mark of Zn3(PO4) 2 crystal) in the coating,combination of which with components parsing by EDS indicated that the sequence of contribution elements P and Zn to erosion resistance of coatings was P>Zn. And the correlative mechanism was discussed,which made it clear that owing to the particularity of the outer-shell electron structure and larger ionic radius,RE was so easy to be polarized and metamorphosed itself that it adsorbed lightly on the basic body to pose gels. They efficiently reduced the activation energy which was required for formation of a new solid phase of phosphates and made it also possible to engender effectively active nucleation regions of cathode and anode under low temperature phosphating condition,which was propitious to formation,densification and uniformization of the phosphate crystal nucleus and growth of the crystallite and coating buildup. Thus it could be seen that REN played the role of surface regulator and accelerant,which speeded up the phosphating,as well as bids amount of porosity of the coating fall to improve the corrosion resistance of the coating.

关键词： rare earths (RE) phosphate coating configuration analysis depolarization nucleation

Study on the Molecular Recognition of α,α,α,β-ZnT（o-BocThr）APP toward Imidazole Derivatives and Amino Acid Esters

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2005年第10期23卷 1381-1386页

作者：阮文娟赵小箐王树军章应辉张智慧南晶朱志昂王建国马毅 Department of Chemistry Nankai University Tianjin 300071 China National Pesticide Engineering Research Center Nankai University Tianjin 300071 China

Molecular Recognition of α,α,α,β-ZnT（o-BocThr）APP （1） toward a series of imidazole derivatives and amino acid esters was investigated. Association constants were determined in chloroform by means of UV-Vis titration method. The association constants of 1 with imidazole derivatives are larger than those of 1 with amino acid esters. 1H NMR spectra were investigated to describe the binding mode of the recognition system, showing that all the protons of the guests were shifted to upfield. The circular dichroism spectra of 1-L-/D-ValOMe showed a split cotton effect in Soret region, while those of 1-L-/D-PheOMe showed no split cotton effect. Molecular modeling was performed to understand chiral recognition on a molecular level. Quantum chemical calculation was carried out based on the stable conformations of these recognition systems, which gave a reasonable explanation for the behavior of molecular recognition. The results indicated that the conformation of 1-D-ValOMe was more stable than that of 1-L-ValOMe.

关键词： chiral porphyrin molecular recognition circular dichroism spectra configuration analysis quantum chemistry calculation

Synthesis and Structure of the Acylhydrazone Schiff Base

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2010年第9期29卷 1399-1403页

作者：吴腊梅李倩金龙飞周忠强 College of Chemistry and Materials Science South-central University for Nationalities

Salicylaldehyde-2-（4-isobutylphenyl）-propionyl hydrazone Schiff base（H2L） has been synthesized and characterized by elemental analysis,IR,1H-NMR spectrum and single-crystal X-ray ***-crystal X-ray diffraction analysis showed that H2L is of monoclinic system,space group P21/c with a = 5.6844（5）,b = 33.568（3）,c = 9.6959（9） ,β = 91.758（2）°,V = 1849.2（3） 3,Mr = 324.41,F（000） = 696,Z = 4,Dc = 1.165 g/cm3,μ = 0.076 mm-1,R = 0.0448 and wR = *** the solid form,the strong intramolecular hydrogen bonds make H2L fully extended into an E isomer about the N=N bond,and each molecule interacts with two neighbors to form 1D hydrogen-bonded *** Schiff base presents two different sets of signals in the 1H-NMR and 13C-NMR spectra in either chloroform or dimethylsulfoxide solution,showing the presence of both E and Z isomers.

关键词： acylhydrazone configuration analysis crystal structure

Green transformation paths of resource-based cities in China from the configuration perspective

在线全文

学校读者我要写书评

暂无评论

Regional Sustainability 2024年第3期5卷 40-53页

作者： GONG Qunxi School of Economics and Management Chongqing Jiaotong UniversityChongqing400074Chin

Green transformation is an unavoidable choice for resource-based cities(RBCs)that face resource depletion and environmental *** research has focused primarily on specific RBCs,making it challenging to apply green transformation strategies universally across *** fuzzy set qualitative comparative analysis(fsQCA)is a combination of qualitative and quantitative analyses that can handle multiple concurrent causality problems and determine how different conditions combine into configurations and generate an ***,to address this gap,in this study,we established a research framework for green transformation and utilized the fsQCA to examine the configurations of 113 RBCs in *** incorporating the element of time,this study explored the dynamic evolution of solutions in 2013,2016,and *** main findings indicate that individual elements do not constitute the necessary conditions for improving the green transformation efficiency(GTE),and the systematic combination of multiple conditions is an effective path for realizing the improvement of the GTE in *** transformation paths of RBCs exhibit the same destination through different ***,the combination of system environment elements and system structure elements is both complementary and *** in RBCs have led to various factor combinations and development paths,but there are some similarities in the key elements of the factor combinations at different *** environment,government support,and technological innovation are key factors that universally enhance the GTE in *** insights can assist city managers in formulating policies to drive green transformation and contribute to a better theoretical understanding of green transformation paths in RBCs.

关键词： Green transformation path Green transformation efficiency Resource-based cities configuration analysis Fuzzy set qualitative comparative analysis(fsQCA)

Research on the High-Quality Development Path of Listed Private Education Groups

在线全文

学校读者我要写书评

暂无评论

Journal of Contemporary Educational Research 2024年第8期8卷 114-122页

作者： Juan Zhang School of Information Management and Engineering Neusoft Institute GuangdongFoshan 528000Guangdong ProvinceChina

The rapid growth of the education industry and private education groups has brought the high-quality development of listed private education companies into focus for both the educational sector and the capital *** study employs the fuzzy-set qualitative comparative analysis(fsQCA)method to explore pathways to high-quality development for these *** analysis confirms that no single factor guarantees a company’s success,highlighting the importance of multi-factor *** main paths to high-quality development are identified:human resource optimization,precise market positioning,and comprehensive ***,four development paths for non-high-level companies are identified:dual insufficiency in resources and market,high turnover and over-investment,scale expansion with resource mismatch,and inadequate human resource *** findings indicate that optimal allocation of educational resources,precise market positioning,rational resource allocation,and staff training are crucial for achieving high-quality *** tests,which raise the consistency threshold,verify the reliability and stability of the *** findings provide a reference for policymakers,investors,and managers in the education industry.

关键词： Private education groups High-quality development Fuzzy-set qualitative comparative analysis configuration analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

什么决定了政府公共卫生治理绩效？

数字人文类文化遗产众包项目可持续发展路径探索

管理科学 2021年第10期

作者：陶克涛张术丹赵云辉

突发公共卫生事件不断挑战着政府的公共卫生治理绩效。如何有效应对突发公共卫生事件是政府决策部门和学术界共同关注的热点问题。本文基于TOE框架以我国31个省级地方政府为案例，运用模糊集定性比较分析（fsQCA）方法，探讨技术、组织... 详细信息

突发公共卫生事件不断挑战着政府的公共卫生治理绩效。如何有效应对突发公共卫生事件是政府决策部门和学术界共同关注的热点问题。本文基于TOE框架以我国31个省级地方政府为案例，运用模糊集定性比较分析（fsQCA）方法，探讨技术、组织、环境条件对地方政府提升公共卫生治理绩效的联动效应及其路径选择，探索性地识别出三类推动政府公共卫生治理绩效提升的配适性选择方案，即由政府自身要素独立解释的配适模式、由环境要素与政府自身要素共同解释的配适模式以及由技术和环境要素共同解释的配适模式。研究发现：（1）单一条件并不构成高公共卫生治理绩效的必要条件，但是提升技术水平在高政府公共卫生治理绩效上发挥着较普适的作用。（2）技术、组织和环境条件“多重并发”，形成驱动政府公共卫生治理绩效的多样化组态，即政府公共卫生治理绩效的驱动路径具有“殊途同归”的特点。（3）在跨案例的比较中进一步发现，我国东、中、西部地区政府公共卫生治理绩效驱动路径存在明显差异。建议各地方政府根据自身特点和资源禀赋，选择适合的路径和有针对性的措施，提升政府公共卫生治理绩效，促进东、中、西部地区政府治理能力的均衡化发展，全面实现政府治理现代化。

关键词：大数据发展注意力分配政府治理公共卫生组态分析 development of big data organizational attention allocation government governance public health configuration analysis

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

学校读者我要写书评

暂无评论

公共图书馆短视频传播效果影响因素组态路径研究

图书馆学情报学 2023年第12期

作者：练靖雯赵宇翔吴大伟朱庆华

[目的/意义]近年来，文化遗产众包项目可持续发展问题开始凸显。探索文化遗产众包项目的可持续发展路径对于实现文化遗产资源的活化传承、有效利用和重用具有重要意义。[方法/过程]文化遗产众包项目可持续发展是一种复杂的现象，受多重... 详细信息

[目的/意义]近年来，文化遗产众包项目可持续发展问题开始凸显。探索文化遗产众包项目的可持续发展路径对于实现文化遗产资源的活化传承、有效利用和重用具有重要意义。[方法/过程]文化遗产众包项目可持续发展是一种复杂的现象，受多重因素的协同影响。基于组态视角，以27个文化遗产众包项目为案例，采用模糊集定性比较分析的研究方法，探索项目各阶段多个条件对项目可持续性的联动效应。[结果/结论]项目定位与愿景、任务设计、志愿者管理、外部支持、技术保障、成果开放性和成果创新性7个条件多重并发，形成了促进文化遗产众包项目可持续发展的多样化组态，表现为“强技术保障加持高质量志愿者管理型”“高成果开放性主导型”和“优质任务设计加持高成果创新型”三大类，共5条路径。研究结论有助于深化对文化遗产众包项目可持续发展问题复杂性的理解，同时能为各类文化遗产众包项目的可持续建设提供启示。

关键词：数字人文文化遗产众包可持续发展模糊集定性比较分析组态分析 digital humanities cultural heritage crowdsourcing sustainable development fuzzy-set qualitative comparative analysis configuration analysis

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

学校读者我要写书评

暂无评论