检索结果-南通市图书馆

Effect of nonlinear and noncollinear transformation strain pathways in phase-field modeling of nucleation and growth during martensite transformation

引用

npj Computational Materials 2017年第1期3卷 294-303页

作者： Pengyang Zhao Chen shen ju li Yunzhi Wang Department of Materials Science and Engineering The Ohio State University2041 College RoadColumbusOH 43210USA GE Global Research One Research CircleNiskayunaNY 12309USA Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA 02139USA

The phase-field microelasticity theory has exhibited great capacities in studying elasticity and its effects on microstructure evolution due to various structural and chemical non-uniformities(impurities and defects)in ***,the usually adopted linear and/or collinear coupling between eigen transformation strain tensors and order parameters in phase-field microelasticity have excluded many nonlinear transformation pathways that have been revealed in many atomistic *** we extend phasefield microelasticity by adopting general nonlinear and noncollinear eigen transformation strain paths,which allows for the incorporation of complex transformation pathways and provides a multiscale modeling scheme linking atomistic mechanisms with overall kinetics to better describe solid-state phase *** case study on a generic cubic to tetragonal martensitic transformation shows that nonlinear transformation pathways can significantly alter the nucleation and growth rates,as well as the configuration and activation energy of the critical *** is also found that for a pure-shear martensitic transformation,depending on the actual transformation pathway,the nuclei and austenite/martensite interfaces can have nonzero far-field hydrostatic stress and may thus interact with other crystalline defects such as point defects and/or background tension/compression field in a more profound way than what is expected from a linear transformation *** significance is discussed on the implication of vacancy clustering at austenite/martensite interfaces and segregation at coherent precipitate/matrix interfaces.

关键词： transformation martensite strain

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

Effect of Calcium Oxide Additive on the Performance of Iron Oxide Sorbent for High-Temperature Coal Gas Desulfurization

引用

Journal of Natural Gas Chemistry 2007年第4期16卷 404-408页

作者： Huiling Fan Kechang Xie ju Shangguan Fang shen Chunhu li Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 Shanxi China

The effect of calcium oxide additive in iron oxide sorbent for hot gas desulfurization was investigated by XRD and TPR *** characterization showed that CaO was highly dispersed after the calcination of *** sulfate formed in the desulfurization was decomposed and regenerated to CaO by reacting with CO before the next sulfidation *** participated in every sulfidation/regeneration cycle and contributed to the enhancement of sulfur *** TPR results showed that the reduction temperature of the sorbent increased with the increase of the content of *** played a role of retarding ***,the addition of calcium oxide additive will benefit the utilization of iron oxide sorbent in strongly reducing atmospheres.

关键词： calcium oxide iron oxide sorbent high temperature desulfurization

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

Natural fractures within unconventional reservoirs of linxing Block,eastern Ordos Basin,central China

引用

Frontiers of Earth Science 2020年第4期14卷 770-782页

作者： Wei ju Jian shen Chao li Kun Yu Hui Yang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou221116China Key Laboratory of Computational Geodynamics College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing100049China

Unconventional reservoirs are generally characterized by low matrix porosity and permeability,in which natural fractures are important factors for gas *** this study,we analyzed characteristics of natural fractures,and their influencing factors based on observations from outcrops,cores and image *** orientations of natural fractures were mainly in the∼N-S,WNW-ESE and NE-SW directions with relatively high fracture dip *** densities were calculated based on fracture measurements within cores,indicating that natural fractures were not well-developed in the Benxi-Upper Shihezi Formations of linxing *** majority of natural fractures were open fractures and *** to the characteristics of fracture sets and tectonic evolution of the study area,natural fractures in the linxing Block were mainly formed in the Yanshanian and Himalayan *** lithology and layer thickness influenced the development of natural fractures,and more natural fractures were generated in carbonate rocks and thin layers in the study *** addition,in the linxing Block,natural fractures with∼N-S-trending strikes contributed little to the overall subsurface fluid flow under the present-day stress *** study results provide a geological basis for gas exploration and development in the linxing unconventional reservoirs of Ordos Basin.

关键词： natural fracture unconventional reservoir linxing region influencing factors Ordos Basin

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

个性化健康教育对妇科腹腔镜手术患者术前焦虑的影响

引用

昆明医科大学学报 2015年第9期36卷 174-176页

作者：沈居丽孙祖燕郜玫贾惠芳云南省第三人民医院妇科云南昆明650011

目的探讨一种能有效缓解妇科腹腔镜术前患者焦虑的健康教育方法.方法将云南省第三人民医院妇科2014年1月至2014年6月拟行腹腔镜手术的患者168例,按连续编号的入院号随机按单双号分为2组,单号为对照组,双号为观察组,每组各84例.对照组采... 详细信息

目的探讨一种能有效缓解妇科腹腔镜术前患者焦虑的健康教育方法.方法将云南省第三人民医院妇科2014年1月至2014年6月拟行腹腔镜手术的患者168例,按连续编号的入院号随机按单双号分为2组,单号为对照组,双号为观察组,每组各84例.对照组采用常规健康教育方法进行术前健康教育,观察组在常规宣教基础上接受针对性个性化健康教育干预措施.对2组患者入院时、术前30 min均采用Zung焦虑自评量表(SAS)分别评分,测定患者焦虑状况,比较2种不同健康教育方式对术前焦虑状况的影响.结果 2组患者入院时焦虑评分无统计学差异(P>0.05),观察组手术前焦虑评分显著低于对照组(P<0.05).结论对妇科腹腔镜手术患者术前实施个性化健康教育,能有效缓解患者术前焦虑状况.

关键词：腹腔镜手术术前焦虑健康教育个性化

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

大断面管幕箱涵顶进引起地表变形的解析解答

引用

岩土工程学报 2025年第1期47卷 184-191页

作者：张坤勇李丹阳张梦沈小锐河海大学岩土力学与堤坝工程教育部重点实验室江苏南京210024 河海大学岩土工程科学研究所江苏南京210024 南京市房屋安全服务中心江苏南京210029

研究大断面管幕箱涵顶进全过程对土体变形和周围环境的影响,对于事前预测变形并控制施工扰动影响具有重要意义。基于Mindlin解答、修正Sagaseta公式等经典理论解答,分别考虑由正面推进力、摩擦力和土体损失等因素引起的地表变形,提出考... 详细信息

研究大断面管幕箱涵顶进全过程对土体变形和周围环境的影响,对于事前预测变形并控制施工扰动影响具有重要意义。基于Mindlin解答、修正Sagaseta公式等经典理论解答,分别考虑由正面推进力、摩擦力和土体损失等因素引起的地表变形,提出考虑三者共同作用下的大断面管幕箱涵顶进引起的地表变形计算方法。建立管幕箱涵顶进作用下土体受力模型,采用Mindlin解答分别给出正面推进力和摩擦力引起的土体变形计算公式;基于当层法原理提出由土体损失引起的横向地表沉降计算公式。根据各影响因素的相对独立性,将各因素引起的土体变形量叠加,从而得到一种适用于大断面管幕箱涵顶进施工,可综合考虑多种施工因素和土体三维变形的理论解答公式。通过工程实例验证公式的合理性,研究成果可为实际施工变形预测提供参考。

关键词：大断面管幕箱涵 Mindlin解地表变形变形预测

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

Early intervention with Didang decoction delays macrovascular lesions in diabetic rats through regulating AMP-activated protein kinase signaling pathway

引用

Chinese Journal of Natural Medicines 2017年第11期15卷 847-854页

作者： REN Dan-Dan li Jing CHANG Bai li Chun-shen YANG ju-Hong Metabolic Diseases Hospital Tianjin Medical University Tianjin 300070 China Tanggu Dahua Hospital Tianjin Coastal New Area Tianjin 300455 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China

The study aimed to investigate the intervening role of Didang decoction(DDD) at different times in macrovascular endothelial defense function, focusing on its effects on the AMP-activated protein kinase(AMPK) signaling pathway. The effects of DDD on mitochondrial energy metabolism were also investigated in rat aortic endothelial cells(RAECs). Type 2 diabetes were induced in rats by streptozotocin(STZ) combined with high fat diet. Rats were randomly divided into non-intervention group, metformin group, simvastatin group, and early-, middle-, late-stage DDD groups. Normal rats were used as control. All the rats received 12 weeks of intervention or control treatment. Western blots were used to detect the expression of AMP-activated protein kinase α1(AMPKα1) and peroxisome proliferator-activated receptor 1α(PGC-1α). Changes in the intracellular AMP and ATP levels were detected with EliSA. Real-time-PCR was used to detect the m RNA level of caspase-3, endothelial nitric oxide synthase(eNOS), and Bcl-2. Compared to the diabetic non-intervention group, a significant increase in the expression of AMPKα1 and PGC-1α were observed in the early-stage, middle-stage DDD groups and simvastatin group(Plism by regulating the AMPK signaling pathway and therefore may play a role in strengthening the defense function of large vascular endothelial cells and postpone the development of macrovascular diseases in diabetes.

关键词： Didang decoction Caspase-3 AMPK Endothelial cells PGC-1α

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

Stress Distribution in the Upper Shihezi Formation from 1D Mechanical Earth Model and 3D Heterogeneous Geomechanical Model,linxing Region,Eastern Ordos Basin,Central China

引用

Acta Geologica Sinica(English Edition) 2021年第3期95卷 976-987页

作者： ju Wei shen Jian QIN Yong WANG Geoff XU Ke li Guozhang li Chao Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhouJiangsu 221008China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Mineral Shandong University of Science and TechnologyQingdaoShandong 266590China School of Resources and Geosciences China University of Mining and TechnologyXuzhouJiangsu 221116China School of Chemical Engineering The University of QueenslandBrisbane St Lucia 4072QueenslandAustralia PetroChina Tarim Oilfield Company KorlaXinjiang 841000China

The Upper Shihezi sedimentary rocks in the linxing region has been estimated with a significant volume of tight sandstone ***,lateral distribution of the present-day stress magnitude is poorly understood,which limits further gas ***,a one-dimensional mechanical earth model and a three-dimensional heterogeneous geomechanical model are built to address this *** results indicate that the strike-slip stress regime is dominant in the Upper Shihezi *** low stresses are mainly located around wells L-60,L-22,L-40,L-90,etc,and stress distributions exhibit the similarity in the Members H2 and *** differential stresses are relatively low in the Upper Shihezi Formation,suggesting that complex hydraulic fracture networks may be *** fractures in the Upper Shihezi Formation contribute little to the overall gas production in the linxing *** addition,the minimum principal stress gradient increases with Young's modulus,suggesting that the stiffer rocks commonly convey higher stress *** is a strong interplay between stress distribution and heterogeneity in rock ***,the relative error between the predicted and measured results is less than 10%,implying that the predicted stress distribution is reliable and can be used for subsequent analysis in the linxing region.

关键词： stress distribution numerical simulation tight sandstone gas Upper Shihezi Formation linxing region Ordos Basin

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

On the heterogeneous microstructure development in the welded joint of 12MnNiVR pressure vessel steel subjected to high heat input electrogas welding

引用

Journal of Materials Science & Technology 2019年第8期35卷 1747-1752页

作者： Yang shen ju Leng Cong Wang School of Metallurgy Northeastern University Shenyang 110819 China shenyang NEU New Industrial Technology Research Institute Co. LTD Shenyang 110819 China

Microstructure features of 12 MnNiVR pressure vessel steel welded joint deposited by the high heat input electrogas welding have been systematically investigated. It is revealed that the welded joint is featured by a heterogeneous juxtaposition. The coarse grained heat-affected zone(CGHAZ) primarily consists of lath bainites and minor granular bainites. The fine grained heat-affected zone(FGHAZ) is dominated by polygonal ferrites, pearlites, and fine cementite particles. Moreover, electron backscatter diffraction results further demonstrate that the CGHAZ is populated by coarse prior austenite grains(PAGs) with high frequency(61.3%) of low angle grain boundaries(LAGBs). On the other hand, the FGHAZ is filled with fine PAGs with a lower frequency(19.6%) of LAGBs. Such microstructural differences may likely contribute to differed mechanical properties for samples tested at designed positions.

关键词： 12MnNiVR pressure vessel steel Electrogas welding High heat input Electron backscatter diffraction

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

舒适护理对腹腔镜CO_(2)气腹并发症患者的效果观察

引用

昆明医科大学学报 2021年第12期42卷 165-168页

作者：段金梅沈居丽林惠仙贾惠芳黄梅云南省第三人民医院妇科云南昆明650011 云南省第三人民医院护理部云南昆明650011

目的探讨舒适护理在妇科腹腔镜术后患者CO_(2)气腹并发症的干预效果。方法选取云南省第三人民医院妇科从2019年6月至2020年12月间收治的204例腹腔镜手术后CO_(2)气腹并发症的患者,采用非随机方便抽样的方法,将其分为对照组和实验组,每组... 详细信息

目的探讨舒适护理在妇科腹腔镜术后患者CO_(2)气腹并发症的干预效果。方法选取云南省第三人民医院妇科从2019年6月至2020年12月间收治的204例腹腔镜手术后CO_(2)气腹并发症的患者,采用非随机方便抽样的方法,将其分为对照组和实验组,每组各102例。对照组给予常规护理,实验组在常规护理的基础上给予舒适护理。结果2组患者在术后焦虑得分、舒适度、术后疼痛、术后排便时间上,实验组优于对照组,差异有统计学意义(P<0.05)。结论舒适护理可减轻患者的术后疼痛、加快患者术后排便时间、缓解腹胀、缓解患者的焦虑情绪、增加患者的舒适度,可在临床中推广应用。

关键词：舒适护理腹腔镜二氧化碳气腹并发症

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

PBL教学法与翻转课堂相结合的教学模式在大学英语读写教学中的应用

引用

昆明医科大学学报 2018年第2期39卷 128-133页

作者：王娟陶永生沈居丽叶吉云屈燕赵珍昆明理工大学津桥学院云南昆明650106 昆明医科大学学报编辑部云南省第三人民医院妇科云南昆明650011 昆明医科大学病原生物学与免疫学实验室云南昆明650500

目的探讨如何应用"翻转课堂与PBL教学法相结合"的课堂教学模式提高学生英语读写能力,提高课堂有效性.方法在大学英语读写教学中,将2015级学生随机分为2组,一组为实验组,采用"翻转课堂与PBL教学法相结合"的课堂教学模式教学,共43人;另一... 详细信息

目的探讨如何应用"翻转课堂与PBL教学法相结合"的课堂教学模式提高学生英语读写能力,提高课堂有效性.方法在大学英语读写教学中,将2015级学生随机分为2组,一组为实验组,采用"翻转课堂与PBL教学法相结合"的课堂教学模式教学,共43人;另一组为对照组,采用传统课堂教学模式,共43人.2组的授课教师相同.将2组教学效果进行对比性研究.采用基础数据分析和问卷调查的方法,从学生期末成绩、学习过程中相关数据、学生对学习成效的满意情况、2种课堂教学模式的反应以及教师收集的2种课堂教学模式教学相关数据等方面进行了调查研究,对比实验组和对照组的学习成效.结果学期结束时,实验组比对照组期末考试成绩和及格率明显提高(P<0.05);在对2种课堂教学模式进行的问卷调查中,实验组学生投入到学习过程中的时间比对照组多.学生认为采用"翻转课堂与PBL教学法相结合"的课堂教学模式下,不仅学生课堂专注度、自主学习能力、课堂参与率、英语读写能力明显提高(P<0.05),而且学生期末考试成绩平均分高于传统课堂的期末考试成绩平均分,学生对这种课堂教学模式满意度高(P<0.05).结论 "翻转课堂与PBL教学法相结合"的课堂教学模式能促进学生自主学习,注重学生吸收及内化所学知识,提高学生的学习兴趣及学习效率,提升教师教学相长能力.

关键词： PBL教学法翻转课堂大学英语读写

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

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：