检索结果-南通市图书馆

A finite dimensional proof of the Verlinde formula

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2020年第10期63卷 1935-1964页

作者： xiaotao sun Mingshuo Zhou Center of Applied Mathematics School of MathematicsTianjin UniversityTianjin 300072China

We prove two recurrence relations among dimensions Dg(r,d,ω):=dim H^0(UC,ω,ΘUC,ω)of spaces of generalized theta functions on the moduli spaces UC,ω.By using these recurrence relations,an explicit formula(the Verl... 详细信息

关键词： moduli space parabolic sheave generalized theta function Verlinde formula

Modification and sequential treatment of EU-1 zeolite in mild alkali and alkaline-acid conditions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第12期24卷 1728-1734页

作者： Xiaofeng Li xiaotao sun Yanting Zhang Junliang Zhang Pengchao Ren Xiaozhen Liu Tao Dou Research Institute of Special Chemicals Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Catalysis of CNPC China University of Petroleum-Beijing Changping Beijing 102249 China

EU-1 zeolites were sequentially treated with low-concentration sodium carbonate(Na_2CO_3) and hydrochloric acid(HCl) *** obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N_2 adsorption/desorption,temperature programmed desorption of NH_3(NH_3-TPD),solid state^(27)A1 nuclear magnetic resonance(^(27)A1 NMR),and the catalytic performances of the treated samples were tested in the xylene isomerization *** results showed that the external surface area and mesoporous volume of the sample sequentially treated with 0.05 mol·L^(-1) Na_2CO_3 and 0.1 mol·L^(-1) HCl solutions reached73.9 m^2·g^(-1) and 0.162 cm^3·g^(-1),*** catalytic performances of EU-1 zeolites were significantly improved,that the activity of the probe reaction increased from 23.03%to 23.61%and the selectivity increased from85.09%to 87.14%compared with those of parent ***,it was found that only amorphous silica and alumina species was dissolved during the post-treatment process,but the framework structure and the acidic properties of EU-1 zeolite remained intact.

关键词： EU-1 zeolite Mesoporous Catalysis

Synthesis, characteristics of hierarchical EU-1 zeolite for xylene isomerization probe reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第11期24卷 1577-1583页

作者： Xiaofeng Li Pengchao Ren Yanting Zhang Xiaozhen Liu xiaotao sun Meng Gao Miaojuan Jia Zhiping Lü Tao Dou Research Institute of Special Chemicals Taiyuan University of Technology CNPC Key Laboratory of Catalysis College of Chemical EngineeringChina University of PetroleumBeijing

Introduced a method of synthesizing hierarchical EU-1 zeolite with organosilanes as additive, and studied the influences of following different kinds of organosilanes on the synthesis of hierarchical EU-1 zeolite: γ-glycidoxy propyl trimethoxy silane(GPTMS), N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxyl silane(APAEDMS),and N-(β-aminoethyl)-γ-aminopropyl dimethoxyl(ethyoxyl) silane(TMPED). The hierarchical EU-1 samples were characterized by XRD, SEM, N_2 adsorption, FT-IR and NH_3-TPD to analyze the crystallinity, morphology, surface area, pore size distribution and acidity. The results showed that hierarchical EU-1 zeolites were successfully synthesized; organosilanes have great influence on crystal morphology of EU-1 zeolites; the exterior surface area of hierarchical EU-1 zeolite, which synthesized with organosilanes(APAEDMS) adding into synthesis system, increased by 62.1% and mesopore volume increased by 129.1% compared with conventional EU-1 zeolites, thus can reduce the diffusional restriction markedly in catalytic reaction. The catalytic performance of hierarchical EU-1zeolites were evaluated in m-xylene isomerization on fixed bed reactor. The catalytic data showed that the isomerization activity PX/X of the hierarchical EU-1 zeolites reached around 24.09% in theoretical thermodynamic equilibrium from 23.83%, and the selectivity of C_8 aromatic hydrocarbon increased from 75.16% to 84.87%. The conversion of p-xylene increased from 16.30% to 18.41%.

关键词： EU-1 Zeolite Hierarchical pore Synthesis Catalysis

Multi-element analysis of Baijiu(Chinese liquors)by ICP-MS and their classification according to geographical origin

在线全文

学校读者我要写书评

暂无评论

Food Quality and Safety 2018年第1期2卷 43-49页

作者： Xuebo Song Min Hou Zhi Li Lin Zhu Fuping Zheng Mingquan Huang xiaotao sun Hehe Li Feng Chen Baoguo sun Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business UniversityBeijingChinaBeijing Laboratory for Food Quality and SafetyBeijing Technology and Business UniversityBeijingChinaThermo Fisher Scientific(China)Inc.BeijingChinaDepartment of FoodNutrition and Packaging SciencesClemson UniversitySouth CarolinaUSA

Objectives:Investigating the element profiles of Be,Al,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Rb,Sr,Ag,Cd,Cs,La,Pr,Nd,Sm,Eu,Gd,Pb,Th,and U of Baijiu(Chinese liquors),and setting up their classification according to geographical *** and Methods:Twenty-eight Chinese liquors from Shandong,Guizhou,and Sichuan provinces were analyzed by inductively coupled plasma mass spectrometry with the aid of matrix matching,online internal calibration,and direct injection to determine the concentrations of the aforementioned 26 *** statistical analysis,based on the contents of elements in the liquors,was applied to differentiate the liquors from different ***:Both the cluster analysis based on 11 elements and the discriminant analysis based on 5 elements can separate the liquors of Shandong Province from others.A leave-one-out cross test of the discriminant analysis data resulted in 100 per cent accuracy regarding the recognition ability and prediction ability for the liquors from Shandong Province,and an overall 75.0 per cent accuracy of its prediction for all the 28 total ***:The liquors of Guizhou and Sichuan provinces can not be differentiated ***:The liquors produced in Shandong Province can be differentiated in a great extent from Guizhou and Sichuan provinces based on the multivariate statistical analysis of the concentration of elements in liquors,while those of Guizhou and Sichuan provinces can not be differentiated successfully due to their geographical adjacency.

关键词： ICP-MS Baijiu Chinese liquor element multivariate statistics

Un raveling the acetals as ageing markers of Chinese Highland Qingke Baijiu using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry combined with metabolomics approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Quality and Safety 2021年第3期5卷 239-246页

作者： Xinlei Wang Xuebo Song Lin Zhu Xiaojie Geng Fuping Zheng Qiangzhong Zhao xiaotao sun Dongrui Zhao Shengbao Feng Mourning Zhao Baoguo sun Beijing Laboratory of Food Quality and Safety Beijing Technology and Business UniversityBeijingChina Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business UniversityBeijingChina School of Food Science and Engineering South China University of TechnologyGuangzhouChina Hebei Hengshui Laobaigan Liquor Co. Ltd.HengshuiChina Qinghai Huzhu Highland Barley Wine Co. Ltd.HuzhuChina

Objectives:The ageing process has a significant impact on the aroma of Chinese Baijiu,which could strengthen the desirable flavor characteristics and reduce the undesirable *** aim of this study was to observe the in itiation of mean in gful cha nges in volatile fracti on and locate the ageing markers during ageing storage of Chinese Highland Qingke *** and Methods:Samples of Chinese Qingke Baijiu were aged for 0,1,2,3,4,5,6,7,8,9,10,and 11 mon ths before an *** samples were isolated by liquid-liquid extraction and then analyzed by comprehensive two-dimensional gas chromatography-time-of-flight mass *** acquired data were processed by untargeted and targeted metabolomics approach to locate the ageing ***:The untargeted metabolomics analysis(hierarchical clustering analysis,HCA)shows that the chemical composition of Qingke Baijiu presents a statistically sigrdficant deviation from the reference scenario after 5 mon ***,supervised statistics analysis(orthogo nal partial least squares discrimination analysis)was performed to locate the markers,which changed sigrdficantly during *** markers were located,and seven of them were ***,1,1-diethoxy-propane,1,1-diethoxy-butane,and 1,1-diethoxy-3-methyl-butane are important contributors to the flavor of Chinese *** identified markers were applied for the untargeted metabolomics(HCA),and the results revealed that these markers could divide the Qingke Baijiu into two ageing stages,0-5 months and 6-11 ***:The results suggest that it is a valuable tool for monitoring the changes of volatile compounds and locating the age markers in Chinese Baijiu.

关键词： Ageing marker metabolomics approach Highland Qingke Baijiu comprehensive two-dimensional gas chromatog-raphy-time-of-flight mass spectrometry.

新加坡CPTPP金融服务负面清单及对我国的启示

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际贸易 2022年第6期 81-88页

作者：孙晓涛中国国际经济交流中心宏观经济研究部综合处

CPTPP高度重视金融服务规则,为其单独设立一章并设置了特殊的负面清单结构,这与我国以往参与的自贸协定有很大不同,我国接下来的谈判将面临较大挑战。新加坡CPTPP金融服务负面清单覆盖范围广、措施针对性强,实现了开放与保护的有效平衡... 详细信息

CPTPP高度重视金融服务规则,为其单独设立一章并设置了特殊的负面清单结构,这与我国以往参与的自贸协定有很大不同,我国接下来的谈判将面临较大挑战。新加坡CPTPP金融服务负面清单覆盖范围广、措施针对性强,实现了开放与保护的有效平衡,对我国具有参考价值。新加坡制订清单时,特别注重维护本国金融业竞争力、保障国内的金融服务可及性、防范外部金融风险的冲击、实现金融竞争力与金融保护的平衡、选择适合国情的开放模式,这些经验都值得我国借鉴。下一步,我国要认真研究新加坡等国的清单,选择适合我国国情的金融开放模式,采取更加开放的心态,进一步开放行业准入,清单更多依靠准入后措施,加强事中事后监管,建立与CPTPP规则相衔接的金融服务负面清单制度,并探索开展多区域多层次金融开放试点。

关键词： CPTPP 金融服务负面清单新加坡金融开放

美国页岩气开发对世界天然气和石油化工产业的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

化工进展 2013年第3期32卷 717-720页

作者：杨挺孙小涛中国化工经济技术发展中心北京100029

美国页岩气的大规模开发对世界天然气和石油化工产业的影响已初步显现,本文从页岩气资源储量和生产现状出发,探讨了美国页岩气对世界天然气供求格局、美国能源结构和世界石油化工产业的影响,指出美国天然气将逐步实现自给,并在未来几年... 详细信息

美国页岩气的大规模开发对世界天然气和石油化工产业的影响已初步显现,本文从页岩气资源储量和生产现状出发,探讨了美国页岩气对世界天然气供求格局、美国能源结构和世界石油化工产业的影响,指出美国天然气将逐步实现自给,并在未来几年有望出口;美国自身能源结构将得到优化,合成氨、甲醇、烯烃等石油化工产业呈现发展趋势,世界石油化工产品供求格局将可能发生较大变化。

关键词：页岩气天然气供求格局能源结构石油化工工业

在线全文

学校读者我要写书评

暂无评论

稳定向量丛模空间中的有理曲线

中国科学：数学 2017年第11期47卷 1441-1466页

作者：刘敏孙笑涛青岛大学数学与统计学院青岛266071 天津大学数学学院天津300072

Fano簇中有理曲线的研究是代数几何的重要课题之一,本文对稳定向量丛模空间中有理曲线研究的现状做一个较全面的总结.

关键词：稳定向量丛的模空间 Hecke曲线分裂直线极小有理曲线小有理曲线 Chow群

Key Technology for Liquid Spawn Production and Green and High-yield Cultivation of Pleurotus eryngii

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2020年第7期12卷 52-54页

作者： Yali ZHANG Shuguang ZHAO Yu LI Zhengpeng LI Cuie ZHANG xiaotao sun Agricultural Technology Extension Center of Guannan County Guannan 222500 China Vegetable Office of Guannan County Guannan 222500 China Institute of Edible Fungi Shanghai Academy of Agricultural Sciences Shanghai 201403 China Jiangsu Lisha Fungus Industry Co. Ltd. Guannan 222500 China

[Objectives]Pleurotus eryngii is currently the second largest edible fungus variety cultivated in China,and it mainly adopts the bag cultivation *** study aims to effectively solve the problems of high cost of solid spawn,long spawn production cycle,low application level of green and high-yield cultivation technology and equipment,and unstable output and quality in the factory production process and to further promote industrial upgrading.[Methods]Since June,2018,a series of research and technical optimizations had been carried out by a technical research team consisting of personnels from Vegetable Office of Guannan County,Institute of Edible Fungi of Shanghai Academy of Agricultural Sciences and Jiangsu Xiangru Biotechnology Co.,Ltd.,around the production of liquid spawn,introduction of excellent varieties of ***,medium pretreatment,autoclaving,clean room inoculation,digital cultivation,harvesting,packaging,etc.[Results]The key technology of industrial production,liquid spawn production and green and high-yield cultivation of *** are summarized.[Conclusions]The economic benefit of liquid spawn of *** is extremely considerable compared with liquid spawns such as branch spawn.

关键词： Pleurotus eryngii Liquid spawn Factory cultivation Green High yield