检索结果-南通市图书馆

The Unconventional Transport Properties of Dirac Fermions in Graphyne

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第7期30卷 189-192页

作者： LIN Xin WANG Hai-Long pan hui XU Huai-Zhe State Key Laboratory of Software Development Environment Department of PhysicsBeihang UniversityBeijing 100191

A two-band Hamiltonian for β-graphyne is derived by the k·p *** energy dispersions around the Dirac points are analytically obtained depending on the relative amplitude of the hopping terms t_(1)/t_(2),and the Dirac cones are elliptical when -2t_(1)/t_(2)*** interesting feature is useful for direction-dependent wave filter devices.

关键词： method. Dirac Fermi

Lower risk of male infanticide in multilevel primate societies

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

Zoological Research 2023年第2期44卷 370-373页

作者： Yi-Lin Xiang Yang Yu hui-Juan pan Ming Li School of Arts and Design Beijing Forestry UniversityBeijing 100083China School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China CAS Key Lab of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China

DEAR EDITOR,Male infanticide is considered a severe manifestation of sexual conflict in non-human primates during male takeover or male dominance changes. Males engaging in infanticide may obtain fitness benefits, but at the cost of female reproductive outcomes. Consequently, females have developed various anti-infanticide counterstrategies, such as coalitions, dispersal.

关键词： dispersal Lower changes.

Management of Adult Growth Hormone Deficiency at Peking Union Medical College Hospital:A Survey among Physicians

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Sciences Journal 2016年第3期31卷 168-172页

作者： Hong-bo Yang Meng-qi Zhang hui pan hui-juan Zhu Department of Endocrinology Peking Union Medical College HospitalChinese Academy of Medical Sciences & Peking Union Medical College Department of Pediatrics Peking Union Medical College HospitalChinese Academy of Medical Sciences & Peking Union Medical College

Objective To evaluate physicians' attitude and knowledge about the management of adult growth hormone deficiency(AGHD) at Peking Union Medical College Hospital and impact factors associated with better *** A 21-question anonymous survey was distributed and collected at Peking Union Medical College Hospital,a major teaching hospital in Chinese Academy of Medical *** of physicians' educational background,clinical training,patient workload per year and continuing medical education in AGHD were *** associated with appropriate answers were further analyzed by multivariate regression *** One hundred and eighteen internal medicine residents,endocrine fellows,attending physicians and visiting physicians responded to the *** them,44.9% thought that AGHD patients should accept recombinant human growth hormone replacement ***,56.8% selected insulin tolerance test and growth hormone-releasing hormone-arginine test for the diagnosis of *** regression analysis of physician demographic data,educational background,and work experience found no consistent independent factors associated with better decision-making,other than continued medical education,that were associated with treatment *** The physicians' reported management of AGHD in this major academic healthcare center in Beijing was inconsistent with current *** quality continued medical education is required to improve Chinese physician management of AGHD.

关键词： adult growth hormone deficiency management continued medical education

Coconut oil research:Past,present,and future directions

在线全文

学校读者我要写书评

暂无评论

Food and Health 2024年第1期6卷 43-52页

作者： Jiao-Jiao Yin He Huang Xiao-Ming Jiang Xing-Yang Guo Bao-hui pan pan Gao Wu Zhong Chuan-Rong Hu Dong-Ping He School of Food Science and Engineering Wuhan Polytechnic UniversityWuhan 430023China Key Laboratory of Deep Processing of Major Grain and Oil Ministry of EducationWuhan 430023China Hubei Key Laboratory for processing and Transformation of Agricultural Products Wuhan 430023China Key Laboratory of Edible Oil Quality and Safety for State Market Regulation Wuhan 430023China Wuhan Institute for Food and Cosmetic Control Wuhan 430071China

Coconut oil contains a rich amount of medium-chain fatty acids,including lauric acid,decanoic acid,and octanoic acid,as well as the corresponding medium-chain *** possesses functional attributes such as facile digestion and absorption,as well as antibacterial and antioxidant *** study utilized the Citespace and VOSviewer visual analysis software to examine the quantity of published papers,authors,publishing institutions,research hotspots and frontiers of 3442 effective literatures on the theme of"coconut oil"in the Web of Science(WoS)Core Collection *** research on coconut oil can be condensed into four primary sections:(1)investigation and utilization of physiochemical characteristics of coconut oil,(2)analysis of nutritional composition and study of the effectiveness of coconut oil,(3)identification of adulteration in coconut oil,(4)evaluation of the impact of coconut oil as a dietary supplement on animal ***,research focal points have evolved in three distinct *** to 2008,numerous studies were conducted to investigate the precise fatty acid makeup of coconut oil and its potential for lowering cholesterol *** 2009 to 2016,significant emphasis was placed on examining the impact of coconut oil on methane production in *** 2018 to 2023,the main focus will be on investigating how nanoparticles can alter the properties of coconut *** the future,the anticipated research areas of interest are expected to focus on the rapid detection method of coconut oil,the efficacy of coconut oil and the advancement of coconut *** objective of this review is to provide researchers with relevant information about coconut oil,aiming to foster the continued growth of the coconut oil industry.

关键词： coconut oil visualized analysis research hotspots physiochemical properties nutrient composition

hPSC源少突胶质前体细胞用于脊髓损伤的治疗作用

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

中国细胞生物学学报 2024年第8期46卷 1543-1557页

作者：潘辉鲍莉纪猛张锋吴月红浙江理工大学生命科学与医药学院杭州310018 浙江泉生生物工程有限公司研发部杭州310018 霍尔果斯新生泉干细胞医疗有限公司研发部伊犁哈萨克自治州835221

脊髓损伤(spinal cord injury,SCI)是一种严重的中枢神经系统(central nervous system,CNS)疾病,常导致严重的功能障碍,因其病理生理机制尚不完全清楚,仍为世界性的医学难题。随着对少突胶质前体细胞(oligodendrocyte progenitor cell,O... 详细信息

脊髓损伤(spinal cord injury,SCI)是一种严重的中枢神经系统(central nervous system,CNS)疾病,常导致严重的功能障碍,因其病理生理机制尚不完全清楚,仍为世界性的医学难题。随着对少突胶质前体细胞(oligodendrocyte progenitor cell,OPC)在CNS中作用的深入研究,以此为基础的细胞疗法成为一种有最具前景的治疗策略。动物实验结果表明,OPC移植到损伤脊髓可促进髓鞘再生、改善运动功能。该文介绍了关于OPC治疗SCI的基本情况,总结了已有的研究成果,指出了其在临床应用中面临的挑战,从而为进一步研究和开发有效的治疗策略提供了依据。

关键词：少突胶质前体细胞脊髓损伤临床试验脱髓鞘髓鞘再生

High density genetic map and quantitative trait loci(QTLs)associated with petal number and flower diameter identified in tetraploid rose

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第5期20卷 1287-1301页

作者： YU Chao WAN hui-hua Peter M.BOURKE CHENG Bi-xuan LUO Le pan hui-tang ZHANG Qi-xiang Beijing Key Laboratory of Ornamental Plants Germplasm Innovation&Molecular Breeding/National Engineering Research Center for Floriculture/Beijing Laboratory of Urban and Rural Ecological Environment/Engineering Research Center of Landscape Environment of Ministry of Education/Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education School of Landscape ArchitectureBeijing Forestry UniversityBeijing 100083P.R.China Plant Breeding Wageningen University&ResearchWageningen 6700 AJThe Netherlands Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry UniversityBeijing 100083P.R.China

Rose is one of the most important ornamental and economic plants in the *** rose cultivars are primarily tetraploid,and during meiosis,they may exhibit double reduction or preferential chromosome ***,the construction of a high density genetic map of tetraploid rose is both challenging and *** this study,a tetraploid rose population was used to conduct a genetic analysis using genome sequencing.A total of 17382 single nucleotide polymorphism(SNP)markers were selected from 2308042 detected *** with 440 previously developed simple sequence repeats(SSR)and amplified fragment length polymorphism(AFLP)markers,a marker dosage of 6885 high quality markers was successfully assigned by GATK software in the tetraploid *** markers were used in the construction of a high density genetic map,containing the expected seven linkage groups with 6842 markers,a total map length of 1158.9 c M,and an average inter-marker distance of 0.18 c *** trait locus(QTL)analysis was subsequently performed to characterize the genetic architecture of petal number and flower *** major QTL(qpnum-3-1)was detected for petal number in three consecutive years,which explained 20.18–22.11%of the variation in petal *** QTLs were detected for flower diameter;the main locus,qfdia-2-2,was identified in two consecutive *** results will benefit the molecular marker-assisted breeding of modern rose *** addition,this study provides a guide for the genetic and QTL analysis of autotetraploid plants using sequencing-based genotyping methods.

关键词： rose tetraploid genetic linkage map QTLs

河流相致密砂岩气地质甜点评价——以四川盆地川中地区侏罗系沙溪庙组二段1亚段为例

在线全文

学校读者我要写书评

暂无评论

石油与天然气地质 2024年第2期45卷 471-485页

作者：潘辉蒋裕强朱讯邓海波宋林珂王占磊李杪周亚东冯林杰袁永亮王猛西南石油大学地球科学与技术学院四川成都610500 中国石油西南油气田分公司气田开发管理部四川成都610051 中国石油西南油气田分公司致密油气项目部四川成都610051 成都西南石油大学科技园发展有限公司四川成都610500

四川盆地侏罗系沙溪庙组储层具有孔隙度和渗透率低、非均质性强、砂体叠置关系复杂的特点,导致地质甜点判别困难、预测精度较低。为实现气藏的高效开发,通过分析、研究沉积作用、成岩作用和源-储配置关系对天然气聚集成藏的影响,建立了... 详细信息

四川盆地侏罗系沙溪庙组储层具有孔隙度和渗透率低、非均质性强、砂体叠置关系复杂的特点,导致地质甜点判别困难、预测精度较低。为实现气藏的高效开发,通过分析、研究沉积作用、成岩作用和源-储配置关系对天然气聚集成藏的影响,建立了研究区沙溪庙组二段1亚段致密砂岩气地质甜点评价标准。研究结果表明:①沉积微相和河道类型控制了砂体规模及储层的物性,顺直河或低弯度曲流河边滩砂体厚度大、物性好,是优质储层发育区。②岩浆岩岩屑含量和成岩相不同是导致储层质量差异的主要原因。其中绿泥石胶结相物性最好。③源-储配置关系控制储层中天然气的充注程度,与烃源断层直接相接或距离烃源断层较近的砂体含气性最好。④储层质量和含气性共同控制单井天然气产量。根据研究提出的地质甜点评价标准,将研究区地质甜点分为3类。Ⅰ类甜点主要为顺直河或低弯度曲流河边滩砂体,孔隙度大于12%,渗透率大于0.30×10^(-3)μm^(2),以绿泥石胶结为主,且距烃源断层近,含气性好,含水饱和度小于30%,泊松比小于0.24,单井产气强度大于0.10×10^(4)m^(3)(/d∙m)。Ⅱ类甜点主要为中弯度曲流河砂体,孔隙度10%~12%,渗透率为0.15×10^(-3)~0.30×10^(-3)μm^(2),以伊利石或伊/蒙混层胶结为主,距烃源断层相对较远,含水饱和度为30%~40%,泊松比为0.24~0.25,单井产气强度为0.05×10^(4)~0.10×10^(4)m^(3)(/d∙m)。Ⅲ类甜点主要为小型中弯度曲流河边滩,孔渗性差,主要发育伊利石或伊/蒙混层胶结,且远离烃源断层,含气性较差。

关键词：顺直河曲流河甜点主控因素甜点评价标准致密砂岩气沙溪庙组侏罗系四川盆地

Accurate surface normal representation to facilitate gradient coil optimization on curved surface

在线全文

学校读者我要写书评

暂无评论

Magnetic Resonance Letters 2023年第1期3卷 67-84,I0004页

作者： Hao Ren hui pan Feng Jia Jan G.Korvink Zhenyu Liu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China School of Optoelectronics University of Chinese Academy of SciencesBeijing101499China Department of Radiology Medical PhysicsMedical Center University of FreiburgFaculty of MedicineUniversity of FreiburgFreiburg79110Germany Institute of Microstructure Technology Karlsruhe Institute of Technology(KIT)Karlsruhe76049Germany

The design methods for gradient coils are mostly based on discrete extrinsic methods(e.g.,the BioteSavart integration calculation),for which the surface normal vector strongly influences any numerical calculation of the discretized *** studies are mostly based on regular or analytical surfaces,which allow normal vectors to be expressed *** certain applications,design methods for extending currentcarrying surfaces from developable or analytic geometries to arbitrary surfaces generated from a scanned point cloud are *** key task is to correctly express the discretized normal vectors to ensure geometrical accuracy of the designed ***,it has been proven that applying a Delaunay triangulation to approximate a smooth surface can result in the discrete elemental normal vectors converging to those of the original ***,this article uses Delaunay triangulation to expand upon previous design methods so that they encompass arbitrary piecewise continuous *** design methods,the stream function and the so-called solid isotropic material with penalization(SIMP)method,are used to design circumvolute and noncircumvolute gradient coils on general surfaces.

关键词： Gradient coils Delaunay triangulation Stream function SIMP method

CdS/SnO_(2)复合材料的制备及其光催化还原Cr(Ⅵ)的性能研究

在线全文

学校读者我要写书评

暂无评论

现代化工 2024年第10期44卷 156-161页

作者：潘会王瑞琼杨子轩朱雨璐甄盈徐宁宁湖北第二师范学院化学与生命科学学院植物抗癌活性物质提纯与应用湖北省重点实验室湖北武汉430074

采用原位沉积法制备了一系列CdS/SnO_(2)复合光催化材料,通过XRD、UV-Vis、XPS、SEM、TEM和I-t曲线对其结构和性能进行表征分析,并将其用于光催化还原Cr(Ⅵ)的研究。结果表明,CdS与SnO_(2)复合增强了单一半导体材料的可见光吸收能力及... 详细信息

采用原位沉积法制备了一系列CdS/SnO_(2)复合光催化材料,通过XRD、UV-Vis、XPS、SEM、TEM和I-t曲线对其结构和性能进行表征分析,并将其用于光催化还原Cr(Ⅵ)的研究。结果表明,CdS与SnO_(2)复合增强了单一半导体材料的可见光吸收能力及光催化活性;当m(CdS)∶m(SnO_(2))为0.7时,CdS/SnO_(2)表现出最佳的光催化活性,光照10 min后光催化还原Cr(Ⅵ)接近100%;0.7CdS/SnO_(2)光催化剂循环使用5次后,其还原率仍为99%。将CdS与SnO_(2)复合增强了单一半导体材料的抗光腐蚀能力,从而提高了其稳定性。

关键词： CdS SnO_(2) 复合材料光催化 Cr(Ⅵ)