检索结果-南通市图书馆

Journal of Natural Gas Chemistry 2007年第1期16卷 46-52页

作者： Lihua Yu xiaoxiang zhang Zongjie Du Da Wang Shurong Wang Shihua Wu Department of Chemistry Nankai University Tianjin 300071 China

Two types of small iron clusters supported on γ-Al2O3-RT（dehydroxylated at room temperature） and γ-Al2O3-800 （dehydroxylated at 800 ℃） were prepared by solvated metal atom impregnation （SMAI） techniques. The iron atom precursor complex, bis（toluene）iron（0） formed in the metal atom reactor, was impregnated into γ-Al2O3 having different concentrations of surface hydroxyl groups to study the effect of surface hydroxylation on the crucial stage of iron cluster formation. Catalysts prepared in this way were characterized by TEM, Mǒssbauer, and chemisorption measurements, and the results show that higher concentration of surface hydroxyl groups of γ-Al2O3-RT favors the formation of more positively charged supported iron cluster Fen/γ-Al2O3-RT, and the lower concentration of surface hydroxyl groups of γ-Al2O3-800 favors the formation of basically neutral supported iron cluster Fen/γ-Al2O3-800. The measured results also indicate that the higher concentration of surface hydroxyl groups causes the rapid decomposition of precursor complex, bis（toluene）iron（0）, and favors the formation of relatively large iron cluster. Consequently, these two types of catalysts show different catalytic properties in Fischer-Tropsch reaction. The catalytic pattern of Fen/γ-Al2O3-RT in F-T reaction is similar to that of the unreduced γ-Fe2O3 and that of Fen/γ-Al2O3-800 is similar to that of the reduced α-Fe2O3.

关键词： iron clusters solvated metal atom impregnation iron atom precursor complex FischerTropsch synthesis alumina supported catalyst

Organocatalytic dynamic kinetic resolution of N-arylindole lactams:atroposelective construction of axially chiral amino acids bearing a C–N chiral axis

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第5期65卷 905-911页

作者： Xianfang Hong Jingcheng Guo Jinhua Liu Wei Cao Chenlong Wei Ye zhang xiaoxiang zhang Zhenqian Fu Key Laboratory of Flexible Electronics&Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Ningbo Institute Chongqing Technology Innovation CenterFrontiers Science Center for Flexible Electronics(FSCFE)Northwestern Polytechnical UniversityXi’an 710072China

Organocatalytic dynamic kinetic resolution of configurationally labile cyclic molecules represents one of the most efficient methods for the atroposelective construction of axially chiral molecules bearing a tetra-ortho-substituted chiral ***,this privileged strategy is limited to constructing a C–C chiral ***,organocatalytic dynamic kinetic resolution of configurationally labile N-arylindole lactams has been successfully achieved at the first time,allowing for access to a structurally diverse set of axially chiral N-arylindole amino esters with a tetra-ortho-substituted C–N chiral axis in excellent yields and *** addition to the N-arylindole skeleton,N-aryl thieno[3,2-b]pyrrole,furo[3,2-b]pyrrole,and pyrrolo[2,3-b]pyridine skeletons are also compatible with this *** transition-metal-free facile strategy features a broad substrate scope,mild reaction conditions,easy scale-up and excellent atom *** potentially valuable molecules,such as axially chiral peptides,were efficiently generated from the resulting configurationally stable axially-chiral N-arylindole amino esters,demonstrating the power of this strategy.

关键词： axially chiral amino acids C–N chiral axis dynamic kinetic resolution N-arylindole lactams organocatalysis

N-heterocyclic carbene-catalyzed atroposelective synthesis of axially chiral 5-aryl 2-pyrones from enals

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第10期65卷 1953-1961页

作者： Guanjie Wang Juhui Huang Linxue zhang Jinna Han xiaoxiang zhang Jie Huang Zhenqian Fu Wei Huang Key Laboratory of Flexible Electronics&Institute of Advanced Materials Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech UniversityNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Ningbo Institute Chongqing Technology innovation CenterFrontiers Science Center for Flexible Electronics(FSCFE)Northwestern Polytechnical UniversityXi’an 710072China

Axially chiral molecules have been widely used in inorganic,material and medicinal *** with well-established N-heterocyclic carbene(NHC)-catalyzed asymmetric construction of centrally chiral molecules,NHC-catalyzed atroposelective synthesis of axially chiral molecules remains largely ***,alkynyl acyl azolium intermediates were commonly used in constructing a heteroaryl ring to furnish axially enantioenriched *** inherent character of the intermediates often led to react with sterically hindered substrates ***,we have successfully disclosed the atroposelective synthesis of axially chiral heteroaryl-aryls from sterically hindered enols through the use of chiral NHCs as catalysts for highly enantioselective Coates-Claisen rearrangements via catalytically generatedα,β-unsaturated acyl *** approach will enable the concise synthesis of valuable tetra-ortho-substituted 2-pyrones in one step with good yield and chirality control.

关键词： N-heterocyclic carbene organocatalysis atroposelective synthesis 2-pyrones enals

在线全文

学校读者我要写书评

暂无评论

基于降雨时空变化的山洪预警临界雨量

南水北调与水利科技（中英文） 2024年第1期22卷 90-98页

作者：王元疆江善虎凌子涵陈宏新张晓祥任立良河海大学水灾害防御全国重点实验室南京210098 河海大学水文水资源学院南京210098 南京南瑞水利水电科技有限公司南京211000

为提高山洪灾害预警精度,以彭坊小流域为例,基于概率分布等控制条件生成随机雨型,探究不同前期影响雨量下随机雨型对山洪预警临界雨量的影响,进一步分析降雨空间分布对山洪预警临界雨量的影响。结果表明:在雨峰位置偏后、雨峰峰值较大... 详细信息

为提高山洪灾害预警精度,以彭坊小流域为例,基于概率分布等控制条件生成随机雨型,探究不同前期影响雨量下随机雨型对山洪预警临界雨量的影响,进一步分析降雨空间分布对山洪预警临界雨量的影响。结果表明:在雨峰位置偏后、雨峰峰值较大的雨型集下,临界雨量波动较大,有较高的不确定性;雨型对临界雨量的影响小于前期影响雨量对临界雨量的影响,在前期土壤较干燥时,雨峰位置系数较小,临界雨量值相对较大,雨型峰值倍比较大时,临界雨量值相对较小,更容易致灾;在降雨空间分布上,当降雨集中在下游时,临界雨量值最小,越容易达到警戒流量,但降雨空间分布对临界雨量的影响小于前期影响雨量的影响,且这种影响会随前期影响雨量的增加而不断减小。

关键词：山洪临界雨量前期影响雨量随机雨型降雨空间分布

基于DEA的江苏省淮安市医疗资源配置效率研究

在线全文

学校读者我要写书评

暂无评论

黑龙江科学 2024年第11期15卷 23-27页

作者：孔晓波张晓翔唐雨薇江苏财经职业技术学院江苏淮安223003

运用数据包络分析(DEA)法,采用相关性分析,DEA变量规模回归模型、Malmquist指数等动态与静态相结合的研究法对江苏省淮安市基层医疗卫生资源的配置效率进行全面研究。研究结果显示,2022年其基层医疗卫生机构的综合技术效率平均值为0.738... 详细信息

运用数据包络分析(DEA)法,采用相关性分析,DEA变量规模回归模型、Malmquist指数等动态与静态相结合的研究法对江苏省淮安市基层医疗卫生资源的配置效率进行全面研究。研究结果显示,2022年其基层医疗卫生机构的综合技术效率平均值为0.738,其中5个区县表现出DEA无效,暴露了资源配置中存在投入冗余问题。2017—2022年,其医疗卫生资源配置的全要素生产率平均值为0.970,年度数据在1.000附近波动,表明部分区县的医疗资源配置效率有待进一步提升。尽管淮安市的医疗资源配置效率总体处于可控范围,但仍需通过优化部分地区医疗机构卫生资源配置,发挥政府主导作用,持续关注医疗资源的投入产出比等对其进行科学合理的监测与规划,以促进其整体配置更高效。

关键词： DEA 配置效率基层医疗卫生资源 Malmquist指数相关性热图淮安市

Synthesis of 2,3-Diaminoindoles via a Copper-Iodine Co-catalytic Strategy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第24期41卷 3567-3572页

作者： Wenhua Yu Yingying zhang xiaoxiang zhang Xiaoting Gu Xirui Qing Wanxing Wei Zhuan zhang Guanghua Li Taoyuan Liang School of Chemistry and Chemical Engineering Guangxi UniversityNanningGuangxi530004 China Guangxi Key Laboratory of Electrochemical Energy Materials NanningGuangxi530004 China Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development NanningGuangxi530004 China Guangxi Key Laboratory of Petrochemical Resource Processing & Process Intensification Technology NanningGuangxi530004 China

A one-pot synthesis of vicinal diamines using indoles,azoles and phenothiazines in a tandem multi-component reaction is *** utilization of a copper-iodine co-catalytic system enables the generation of a diverse range of vicinal diaminoindoles with good selectivity and moderate to good *** attractive aspect of this method is that it can be conducted under mild and environmentally friendly conditions,showcasing its potential as an alternative approach for synthesizing vicinal ***,the use of a multicomponent tandem reaction highlights the power and versatility of such strategies in synthetic chemistry.

关键词： Indoles Tandem dual C—H amination Vicinal diamines Copper-iodine co-catalysis Multi-component reaction

乙二胺四乙酸及其钠盐对钢渣砌块碳化性能的影响

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

绿色建筑 2024年第5期 140-145页

作者：顾磊邓加鑫袁慧慧张晓翔常州市建筑科学研究院集团股份有限公司江苏尼高科技有限公司

利用加速钢渣的碳化制备建筑材料是一种有效资源化利用钢渣并吸附二氧化碳（CO2）的手段。然而，由于CO2的传输和动力学限制，钢渣的碳化通常在高温、高压且纯CO2浓度下进行。为减少加速碳化过程中的能源消耗，在常压和低CO2浓度条件下... 详细信息

利用加速钢渣的碳化制备建筑材料是一种有效资源化利用钢渣并吸附二氧化碳（CO2）的手段。然而，由于CO2的传输和动力学限制，钢渣的碳化通常在高温、高压且纯CO2浓度下进行。为减少加速碳化过程中的能源消耗，在常压和低CO2浓度条件下对钢渣砌块进行加速碳化试验。在钢渣砌块中掺入乙二胺四乙酸（EDTA）及其钠盐乙二胺四乙酸二钠（EDTA-2Na）、乙二胺四乙酸四钠（EDTA-4Na），通过抗压强度和固碳率评估钢渣砌块的碳化性能，并利用X射线衍射（XRD）与扫描电镜图（SEM）分析产物与微观形貌。结果表明，在钢渣砌块中掺入EDTA及其钠盐可提升碳化强度和固碳率，其中增益效果为EDTA-2Na>EDTA-4Na>EDTA。EDTA及其钠盐的掺入并不会改变碳化钢渣的产物种类，但会形成更多颗粒尺寸更小的方解石填充孔隙，使基体致密程度更高。研究结论可为钢渣的资源化利用提供参考。

关键词：钢渣 EDTA 碳化抗压强度固碳率

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

响应面优化黑苦荞粉闪电泡芙配方工艺

农产品加工 2024年第9期 41-46页

作者：朱镇华张小香陶斌鑫陈韬钟志惠四川旅游学院四川成都610100

以黑苦荞粉、低筋面粉、黄油、鸡蛋液、牛奶等为原材料,研制一款黑苦荞粉闪电泡芙。通过单因素试验,研究黑苦荞粉用量、鸡蛋液用量、黄油用量、烘烤温度对闪电泡芙的品质影响。再结合响应面试验,以感官评分、质构测定、比容测定为评价指... 详细信息

以黑苦荞粉、低筋面粉、黄油、鸡蛋液、牛奶等为原材料,研制一款黑苦荞粉闪电泡芙。通过单因素试验,研究黑苦荞粉用量、鸡蛋液用量、黄油用量、烘烤温度对闪电泡芙的品质影响。再结合响应面试验,以感官评分、质构测定、比容测定为评价指标,对普通闪电泡芙配方进行创新研究。通过试验得出黑苦荞粉闪电泡芙的最优配方中各组分的用量为低筋面粉85 g,黑苦荞粉15 g,水100 g,牛奶70 g,黄油85 g,白砂糖10 g,食盐2 g,鸡蛋液105 g,烘烤温度165℃,烘烤时间30 min,在此条件下制作的黑苦荞粉闪电泡芙外形完整、色泽金黄、口感酥脆、香味浓郁、内部空洞较大、絮状物少、品质最佳。

关键词：黑苦荞闪电泡芙响应面试验感官评分质构测定

Characterization and evaluation of rice blast resistance of Chinese indica hybrid rice parental lines

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2017年第6期5卷 509-517页

作者： Yunyu Wu Ling Yu Ning Xiao Zhengyuan Dai Yuhong Li Cunhong Pan xiaoxiang zhang Guangqing Liu Aihong Li Lixiahe Agricultural Research Institute of Jiangsu Province Yangzhou 225009 China Jiangsu Collaborative Innovation Center for Modern Crop Production Nanjing 225009 China Jiangsu Golden Land Seed Industry Co. Ltd China

The development of resistant varieties and hybrid combinations has been the most effective and economical strategy to control blast disease caused by Magnaporthe ***, the distribution of major R genes and blast resistance characterization in hybrid rice parents has not been well investigated, resulting in their limited use in hybrid rice blast-resistance breeding. In the present study, 88 elite indica hybrid rice parental lines were evaluated with 30 isolates of M. oryzae collected from the main planting area of indica hybrid rice in China and were characterized for the presence of 11 major resistance genes using molecular markers. The pathogenicity assays showed that four types of hybrid rice parent line showed some resistance to M. oryzae. However, the proportions of highly resistant lines and the mean resistance frequency(RF) varied among the four types, with resistance in decreasing order shown by three-line restorer lines, three-line maintainer lines, two-line sterile lines, and two-line restorer lines. All 88 hybrid rice parental lines carried more than one R gene, but none carried the R genes Pi1 and Pi2. Although Pid3 and Pi9 were present only in three-line restorer lines and Pigm only in three-line maintainer lines, the remaining six R genes(Pib, Pid2, Pi5, Pia, Pi54, and Pita) were present in the four types of hybrid rice parent with significantly different distribution frequencies. The correlation between R genes and resistance reactions was investigated. The results are expected to provide useful information for rational utilization of major R genes in hybrid rice breeding programs.

关键词： Hybrid rice parental lines Magnaporthe oryzae Pi genes Resistance evaluation Molecular markers

智能价格监管平台提升医院服务水平的管理实践

在线全文

学校读者我要写书评

暂无评论

现代医院 2024年第6期24卷 925-927页

作者：单杰熊志刚张晓祥汪火明郑大喜华中科技大学同济医学院附属同济医院湖北武汉430000

医疗服务价格监管影响医嘱开立、治疗操作、检查检验执行、手术麻醉、护理管理等医疗服务全过程,在规范诊疗服务行为、节约治疗成本上起着重要作用。文章通过分析医院价格管理现状,梳理价格监管政策,利用价格智能监管平台的事前提醒、... 详细信息

医疗服务价格监管影响医嘱开立、治疗操作、检查检验执行、手术麻醉、护理管理等医疗服务全过程,在规范诊疗服务行为、节约治疗成本上起着重要作用。文章通过分析医院价格管理现状,梳理价格监管政策,利用价格智能监管平台的事前提醒、事中干预和事后监管功能,解决重复收费、超限定频次收费等不合理收费问题,从而筛查并整治违规诊疗和过度医疗等行为。以价格智能监管平台为抓手,让信息和数据多跑路,优化相关业务流程,促进患者和医院职工的双满意,进一步提升医院管理水平和服务水平。

关键词：智能价格监管服务水平管理实践