检索结果-南通市图书馆

Petrogenesis of the Carboniferous Intrusive Rock in the Xiaobaishitou District of East Tianshan,Northwest China:Magma Evolution and Tectonic Significance

引用

Acta Geologica Sinica(English Edition) 2023年第1期97卷 90-105页

作者： LI Ning ZHANG Zhixin YANG fuquan LIU Dongna Department of Earth Science and Engineering College of Mining EngineeringTaiyuan University of TechnologyTaiyuan 030024China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural ResourcesInstitute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

The Xiaobaishitou gabbro-diorite pluton comprises a medium-grained gabbro-diorite suite and a fine-grained diorite suite,which intrude the Kawabulag Group in the East Tianshan Orogen of the Central Asian Orogenic Belt(CAOB).A combination of mineral chemistry,zircon U-Pb age,whole-rock geochemistry,Sr-Nd isotopes,and in situ zircon Hf isotopes for newly found gabbro-diorite from the Xiaobaishitou district in the Central Tianshan Terrane(CTT)is presented to investigate the petrogenesis and tectonic or even crustal evolution of the East Tianshan *** ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)zircon U-Pb analyses indicate that the gabbro-diorite was formed at 324.7±2.4 *** isolated clinopyroxene formed under higher P-T-fO_(2)melt conditions(10.7–14.6 kbar;1199–1269℃;high fO_(2))than those for the hornblende,plagioclase,and zircon(557–687℃;moderate fO_(2))in the gabbro-diorite,which reveals a multilevel,magmatic storage *** gabbro-diorite is characterized by fractioned REE patterns,enriched LILEs(e.g.,Ba and Pb),negative anomalies of HFSEs(e.g.,Nb and Ta),and low La/Yb and Sr/Y ratios,which are typically indicative of crustal contamination and accounted for by subduction-related *** rock also characterized by typical features of high compatible elements(MgO=3.14–11.65 wt%,Cr=1–157 ppm,Ni=6–830 ppm),high Mg^(#)(47–74),positiveε_(Hf)(t)values(+5.1 to+10.3)andε_(Nd)(t)values(+2.3 to+4.4).These features suggest that the Xiaobaishitou gabbro-diorite was most likely derived from metasomatic mantle and contaminated minor crustal *** into account the spatial and temporal distribution of the Carboniferous magmatic rocks in the CTT,we suggest the formation of the Xiaobaishitou gabbro-diorite was attributed to southward subduction of the Kangguer Ocean.

关键词： petrogenesis geodynamic implication gabbro-diorite Carboniferous East Tianshan Orogen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于自适应滑模控制器的PMSM调速策略研究

引用

郑州大学学报（理学版） 2025年第1期57卷 88-94页

作者：王要强王秋旭聂福全张晓光梁军郑州大学电气与信息工程学院河南郑州450001 河南省电力电子与电力系统工程技术研究中心河南郑州450001 河南科技学院机电学院河南新乡453400 北方工业大学电气与控制工程学院北京100144 卡迪夫大学工程学院英国卡迪夫CF243AA

为了提高永磁同步电机的调速性能,滑模控制逐渐取代PI控制被引入控制系统中。但是传统滑模控制中趋近律的趋近速度慢与固有抖振问题制约着滑模控制的发展,为此提出一种改进的滑模趋近律。首先,为了解决传统等速趋近律中趋近速度和抖振... 详细信息

为了提高永磁同步电机的调速性能,滑模控制逐渐取代PI控制被引入控制系统中。但是传统滑模控制中趋近律的趋近速度慢与固有抖振问题制约着滑模控制的发展,为此提出一种改进的滑模趋近律。首先,为了解决传统等速趋近律中趋近速度和抖振难以平衡的问题,在所提趋近律中引入系统状态变量,并在滑模增益中引入指数项,使其在保证趋近速度的同时抑制滑模抖振。其次,由于开关函数在零点附近具有不连续的特性,会引起滑模抖振,为此采用sat函数代替常规开关函数,能够在保证响应速度的前提下抑制滑模抖振。然后,基于所提趋近律,设计永磁同步电机的滑模速度控制器。最后,仿真和实验结果表明,所提趋近律可以提高永磁同步电机调速系统的控制性能。

关键词：永磁同步电机滑模控制自适应趋近律 sat函数系统状态量

来源：

维普期刊数据库

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

Effect of glutamine on change in early postoperative intestinal permeability and its relation to systemic inflammatory response

引用

World Journal of Gastroenterology 2004年第13期10卷 1992-1994页

作者： Zhu-fuquan ChongYang NingLi Jie-ShouLi ResearchInstituteofGeneralSurgery JinlingHospitalMedicalCollegeofNanjingUniversityNanjing210002JiangsuProvinceChina

AIM: To study the effects of glutamine (Gin) on the change of intestinal permeability and its relationship to systemic inflammatory response in early abdominal postoperative ***: A prospective, randomized, double-blind and controlled trial was taken. Twenty patients undergoing abdominal surgery were randomized into Gin group (oral administration of glutamine, 30 g/d, for 7 d, n=10) and placebo group (oral administration of placebo, 30 g/d, for 7 d, n=-10). Temperatures and heart rates of all patients were daily recorded. White blood cell counts(WBC) and biochemical variables were measured before operation and 4 and 7 d alter drug administration. Serum concentrations of glutamine, endotoxin, diamine oxidase and malondialdehyde and urine lactulose/mannito (L/M) ratio were measured before and 7 d alter drug ***: The patients in the 2 groups were comparable prior to drug administration. Serum Gin concentration was significantly decreased in the placebo group and increased in the Gin group 7 d alter drug administration. Urine L/M ratio was significantly increased in the placebo group and decreased in the Gin group. The serum concentration of endotoxin, diamine oxidase and malondialdehyde was significantly decreased in the Gin group compared with those in the placebo group. Temperatures, heart rates and WBC counts were significantly lower in the Gin group than those in the placebo ***: Gut is one of the sources of systemic inflammatory response in abdominal postoperative patients and glutamine can decrease intestinal permeability, maintain intestinal barrier and attenuate systemic inflammatory response in early postoperative patients.

关键词：谷氨酰胺早期手术治疗肠渗透性系统性炎性反应腹部外科

来源：

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

Effects of Electron Donating Ability of Substituents and Molecular Conjugation on the Electronic Structures of Organic Radicals

引用

Chemical Research in Chinese Universities 2023年第2期39卷 202-207页

作者： LI Pengyuan FENG Lu LI Guangyue BAI fuquan International Joint Research Laboratory of Nano-Micro Architecture Chemistry Institute of Theoretical Chemistry and College of ChemistryJilin UniversityChangchun130021P.R.China College of Chemical Engineering North China University of Science and TechnologyTangshan063210P.R.China International Innovation Center for Forest Chemicals and Materials Nanjing Forestry UniversityNanjing210037P.R.China

The geometries and electronic structures of a series of electron donor-acceptor radical molecules have been studied *** computational results show that the introduction of substituents with strong electron donating ability into tri-(2,4,6-trichlorophenyl)methyl(TTM)radicals enables the radical molecules to form the non-Aufbau electronic *** difficulty of forming the non-Aufbau electronic structure decreases with the enhancement of the electron donating ability of the substituent,but the expansion of the molecular conjugated system is not conducive to the *** hybridization of different fragments in molecular orbitals results in the disproportionation of orbital energy level and forms a staggered energy level *** electronic structure of radical molecules can be adjusted by substituents and molecular skeleton profoundly,which is a very effective means for molecular design.

关键词： Radical emitter Non-Aufbau electronic structure Molecular orbital characteristics Density functional theory and time-dependent density functional theory(DFT and TDDFT)

来源：

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

Does the molecular structure of CaH_2 affect the dihydrogen bonding in CaH_2 HY(Y = CH_3,C_2H_3,C_2 H,CN,and NC) complexes? A quantum chemistry study using MP2 and B3LYP methods

引用

Science China Chemistry 2012年第2期55卷 262-269页

作者： FENG Lu BAI fuquan WU Yang ZHANG HongXing State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130023 China College of Chemistry Liaoning University Shenyang 110036 China

Second-order Maller-Plesset （MP2） and density functional theory （DFT） calculations have been carried out in order to inves- tigate the structures and properties of dihydrogen-bonded CaH2...HY （Y = CH3, C2H3, C2H, CN, and NC） complexes. Our cal- culations revealed two possible structures for Call2 in CaH2..,HY complexes： linear （I） and bent （II）. The bond lengths, interac- tion energies, and strengths for H...H interactions obtained by both MP2 and B3LYP methods are quite close to each other. It was found that the interaction energy decreases with increasing electron density at the Ca-H bond critical point. At- om-in-molecule （AIM） results show that for all of Ca-H...H-Y interactions considered here, the Laplacian of the electron densi- ty at the H--.H bond critical point is positive, indicating the electrostatic nature of these Ca-H...H-Y dihydrogen bonded systems.

关键词： dihydrogen bond interaction energy NBO AIM theory bond critical point

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

DFT/TDDFT investigation on bis-cyclometalated alkynylgold(Ⅲ)complex: Comparison of absorption and emission properties

引用

Science China Chemistry 2013年第5期56卷 641-647页

作者： LI LeiJiao BAI fuquan ZHANG HongXing LI HuiYing State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Jilin Institute of Chemical Technology College of Computer Science and Technology Jilin University

absorption and phosphorescent mechanism of three Au（III） complexes, Au（2,5-F2C6H3-C^CAC）（C = C-C6H4N（C6Hs）2 [Au25FPh], Au（3,5-F2C6Ha-CACAC）（C=C-C6H4N（C6Hs）2 [Au35FPh], and Au（3,5-F2C6H3-CAC^C）（C=C-C6H4N（1H- indole）2 [Au35FID], are calculated and compared using density functional theory （DFT） and time-dependent DFT （TDDFT）. The calculated results reveal that enlarging the center CACAC ligand will result in the enhanced LMCT participation. This theoretical contribution allows design of new Au（III） complexes with higher phosphorescence efficiency.

关键词： Gold(Ⅲ) absorption phosphorescence density functional calculations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clinical characteristics of hepatopulmonary syndrome and hepatorenal syndrome and associated therapeutic potential of transjugular intrahepatic portosystemic shunt

引用

iLIVER 2023年第1期2卷 67-72页

作者： Haoyu Wang fuquan Liu Peking University the 9th Clinical Medical College Shijitan Hospital Beijing 100038China

Hepatorenal syndrome(HRS)and hepatopulmonary syndrome(HPS)are two serious complications of liver disease,causing damage not only to the liver but also to the kidneys,lungs,and *** and HPS affect the patient's circulatory and respiratory systems,with poor prognosis and high mortality in clinical *** is a lack of effective treatment other than liver *** intrahepatic portosystemic shunt(TIPS)is an effective tool to prolong the survival of patients with advanced liver disease and is mainly used to treat portal hypertension and ascites because it can effectively reduce portal *** on the treatment of both of these complications with TIPS are limited and deserve further study because the therapeutic effects of TIPS have the potential to improve the prognosis of severe liver *** article reviews the clinical features of HRS and HPS,the consequences of these syndromes,and the potential mechanistic effects after TIPS intervention.

关键词： Hepatopulmonary syndrome Hepatorenal syndrome Transjugular intrahepatic portosystemic shunt

来源：

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

New Zircon U-Pb Age of Granodiorite from the Shayikenbulake Be Deposit in Altay, Xinjiang and its Significance

引用

Acta Geologica Sinica(English Edition) 2018年第2期92卷 870-871页

作者： LI Qiang YANG fuquan YANG Chengdong Key Laboratory of Metallogeny and Mineral Assessment Ministry of Land and Resources Institute of Mineral Resources Chinese Academy of Geological Sciences

Objective Intrusive rocks are widely distributed in Altay, Xinjiang, and appear in every structural belt. The rocks are mainly granite （Song Peng et al., 2017）, which formed from 523 Ma to 202 Ma and can be divided into five periods： 479-421 Ma, 410-370 Ma, 368-313 Ma, 300- 252 Ma and 247-202 Ma. However, intrusive rocks earlier than the Ordovician are rarely found. The small- scale low-grade metamorphic granite intruded in the Kanasi Group is the oldest intrusion reported up to now, which is the only one formed in the Early Cambrian （5234-19 Ma, Liu Yuan et al., 2013）. Few Cambrian intrusions limit the study of early magmatic-tectonic evolution in Altay. Medium-free-grained granodiorite is exposed widely in the Shayikenbulake deposit of Central Altay, and occurs as batholith. It formed in the Early Cambrian indicated by U-Pb dating, and is an ideal intrusion for studying Cambrian magmatic-tectonic events in Altay.

关键词： Pb ICP MS Co Xinjiang and its Significance New Zircon U-Pb Age of Granodiorite from the Shayikenbulake Be Deposit in Altay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid profiling rock mass quality underneath tunnel face for Sichuan-Xizang Railway

引用

Underground Space 2024年第6期19卷 138-152页

作者： Siyuan Wu Min Qiu Zhao Yang fuquan Ji Zhongqi Quentin Yue Department of Civil Engineering The University of Hong KongHong Kong 999077China CCCC Second Harbor Engineering Company Ltd. Wuhan 430000China Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure Wuhan 430000China

The Sichuan-Xizang Railway is a global challenge,surpassing other known railway projects in terms of geological and topographical *** paper presents an approach for rapidly profiling rock mass quality underneath tunnel face for the ongoing construction of the Sichuan-Xizang *** adopts the time-series method and carries out the quantitative analysis of the rock mass quality using the depth-series measurement-while-drilling(MWD)data associated with drilling of blastholes.A tunnel face with 15 blastholes is examined for *** results include identification of the boundary of homogeneous geomaterial by plotting the blasthole depth against the net drilling time,as well as quantification of rock mass quality through the recalculation of the new specific *** new specific energy profile is compared and highly consistent with laboratory test,manual logging and tunnel seismic prediction *** consistency can enhance the blasthole pattern design and facilitate the dynamic determination of charge placement and *** paper highlights the importance of digital monitoring during blasthole drilling for rapidly profiling rock mass quality underneath and ahead of tunnel *** upgrades the MWD technique for rapid profiling rock mass quality in drilling and blasting tunnels.

关键词： Measurement-while-drilling Drilling and blasting Rock mass quality New specific energy Constant penetration rate Sichuan-Xizang railway Tunnelling

来源：

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

Development Trends of Transmissions for Hybrid Electric Vehicles Using an Optimized Energy Management Strategy

引用

Automotive Innovation 2018年第4期1卷 291-299页

作者： Tianze Shi fuquan Zhao Han Hao Zongwei Liu Tsinghua Automotive Strategy Research Institute Tsinghua UniversityBeijing 100084China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China

Energy conservation and emissions reduction have become increasingly significant for automobiles due to the severity of the current energy *** electric vehicle(HEV)technology is one of the most promising *** study investigated the total efficiency of a HEV *** improve the total efficiency,the engine should be regulated to work at its highest efficiency and drive the wheels directly as much as *** accomplish this,we developed an energy management strategy based on the direct drive area(DDA)of the engine’s efficiency *** typical HEV models were built to compare the fuel consumption using DDA and rule-based ***,the function of the HEV transmission system with DDA was *** transmission in a HEV should regulate the engine to work at its highest efficiency as much as possible,which is rather different than the regulation in an internal combustion engine *** functional change may lead to transmission systems with fewer gears but optimal gear *** this trend is realized,the manufacturing cost of HEVs could be largely reduced.

关键词： HEV Direct drive area Energy management Transmission cost reduction

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：