检索结果-南通市图书馆

Performance Analysis of Interconnected Communication Networks

The Journal of China Universities of Posts and Telecommunications 1998年第1期5卷 72-72,75页

作者： wang jianli directed by zhou jiongpan (Department of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China)

As the means for communication of users in different communication networks and network resource sharing, communication network interconnection has been paid great attention to in recent years. The performance analysis of internetworks is very important in communication network interconnection, for it is the basis for the study of other problems concerned. The main contribution of this paper is a wide and deep study of performance of internetwork, the construction of systematic performance analysis method for arbitrary internetworks, and of queuing model for gateways. In this paper, the performance analysis of internetwork with arbitrary topology is studied for the first time, and a new method - Node Equivalence of Subnetworks (NES) is proposed. The key step of this method is the node equivalence of subnetworks of all kinds, so we first deeply study the node equivalence, and develop two models for node equivalence. Then we study the node equivalence of CSMA/CD and SLOTTED ALOHA systems by using these models. The results show that the NES method is a systematic method which is suitable for performance analysis of any type of internetworks. The proposed equivalence models is usable with good approximation. The queuing model of gateway is first widely studied in this paper. The queuing model for gateways with packet fragmentation and reassembly is studied for the first time and the analysis method, proposed. In the analysis, two modeling tools, Reversed Switched Poisson Process (RSPP) and Switched Determined Process (SDP), are proposed and RSPP/M/1 queue and SDP/D/1 queue, analyzed. A new method-minislot method is proposed and used for the study of SDP/D/1 queue and performance of ATM multiplexer. In this paper, the interdeparture time distribution of ATM network under some input traffic models is studied and the expression, derived. These results can be used for both performance evaluation of ATM network and the performance of ATM networks intercon

关键词： interconnected communication network internetworks gateway subnetworks node equivalence

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

An inducible CRISPR activation tool for accelerating plant regeneration

引用

Plant Communications 2024年第5期5卷 109-122页

作者： Cuimei Zhang Yajun Tang Shanjie Tang Lei Chen Tong Li Haidi Yuan Yujun Xu Yangyan zhou Shuaibin Zhang jianli wang Hongyu Wen Wenbo Jiang Yongzhen Pang Xian Deng Xiaofeng Cao Junhui zhou Xianwei Song Qikun Liu State Key Laboratory of Protein and Plant Gene Research School of Advanced Agricultural SciencesPeking UniversityBeijing 100871China Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences at WeifangShandong 261000China National Center for Plant Gene Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Grass and Science Institute of Heilongjiang Academy of Agricultural Sciences Heilongjiang 150086China Institute of Animal Science Chinese Academy of Agricultural SciencesBeijing 100193China Key Laboratory of Seed Innovation and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China

The inducible CRISPR activation(CRISPR-a)system offers unparalleled precision and versatility for regu-lating endogenous genes,making it highly sought after in plant *** this study,we developed a chem-ically inducible CRISPR-a tool for plants called ER-Tag by combining the LexA-VP16-ER inducible system with the SunTag CRISPR-a *** systematically compared different induction strategies and achieved high efficiency in target gene *** demonstrated that guide RNAs can be multiplexed and pooled for large-scale screening of effective morphogenic genes and gene pairs involved in plant *** experiments showed that induced activation of these morphogenic genes can accelerate regenera-tion and improve regeneration efficiency in both eudicot and monocot plants,including alfalfa,woodland strawberry,and *** study expands the CRISPR toolset in plants and provides a powerful new strategy for studying gene function when constitutive expression is not feasible or ideal.

关键词： inducible CRISPR activation morphogenic gene genetic transformation plant regeneration

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

基于3m波长地铁钢轨焊缝接头不平顺的轮轨响应分析

引用

铁道标准设计 2024年第2期68卷 52-59,67页

作者：徐舟从建力赵铭洋王平陈嵘西南交通大学高速铁路线路工程教育部重点实验室成都610031 西南交通大学土木工程学院成都610031

相对于1 m弦测值的焊缝接头动力学评估与管理,基于3 m波长范围的焊缝接头不平顺轮轨响应分析对其服役状态评估与管理具有重要意义。首先,基于车辆-轨道垂向耦合动力学理论建立车辆-轨道垂向耦合模型;然后,借助基于一弦N点弦测法研制的... 详细信息

相对于1 m弦测值的焊缝接头动力学评估与管理,基于3 m波长范围的焊缝接头不平顺轮轨响应分析对其服役状态评估与管理具有重要意义。首先,基于车辆-轨道垂向耦合动力学理论建立车辆-轨道垂向耦合模型;然后,借助基于一弦N点弦测法研制的钢轨短波不平顺测量小车,对地铁线路焊缝接头不平顺进行精确测量,并根据传统弦测理论得到1 m弦测值;接着,将实测3 m波长焊缝接头不平顺和1 m弦测值作为车辆-轨道垂向耦合模型的不平顺激励输入,对比3 m波长焊缝接头不平顺和1 m弦测值激扰下的轮轨响应;最后,研究了车速和焊缝位置对轮轨动力响应的影响。结果表明:相比1 m弦测值激扰下的轮轨动力响应结果,3 m波长焊缝接头不平顺激扰下的轮轨力幅值变化不明显,轮重减载率幅值增大11.52%,钢轨加速度幅值增大54.05%,轮对振动加速度幅值增大37.67%;车速提高会导致轮轨力和轮重减载率幅值增大;焊缝中心与轨枕间的距离增加,轮轨力幅值先增加后减小,当焊缝中心距离轨枕0.1 m时,轮轨力幅值最大。

关键词：地铁 3m波长焊缝钢轨焊缝接头短波不平顺车辆-轨道垂向耦合动力学轮轨响应

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

22 kW near-diffraction-limited Yb:YAG slab laser amplifier without adaptive optics correction

引用

Chinese Optics Letters 2024年第3期22卷 65-70页

作者：汪丹何平周唐建李密邬映臣王亚楠尚建力高清松张凯唐淳朱日宏 School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China Institute of Applied Electronics China Academy of Engineering PhysicsMianyang 430079China Graduate School of China Academy of Engineering Physics Beijing 100193China

A high-power CW Yb:YAG slab laser amplifier with no adaptive optics correction has been experimentally *** room temperature,the amplifier emits a power of 22 kW with an average beam quality(β)of less than 3 in 0.5 *** our knowledge,this is the brightest slab laser without closed-loop adaptive optics demonstrated to *** addition,an extracted power of 17 kW with an optical extraction efficiency of 33%,corresponding to a residual optical path difference of less than 0.5μm,is achieved with the single Yb:YAG slab gain *** slab gain module has the potential to be scalable to higher powers while maintaining good beam *** makes a high-power solid-state laser system simpler and more robust.

关键词： laser amplifier Yb:YAG slab laser surface quality pumping uniformity

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

茶树组织培养技术与应用研究进展

引用

分子植物育种 2024年第14期22卷 4733-4746页

作者：周颖怡王景飞钟建立李栋梁海南省农业科学院热带园艺研究所热带特种经济植物种质资源创新利用重点实验室海口571100 海南省热带农业资源开发利用研究所三亚572025

茶树是多年生异花授粉植物,具有较高的经济价值和饮用价值。植物组织培养技术为茶树种质资源离体保存、快速繁殖、遗传转化、多倍体育种、基因功能研究和次生代谢产物生产等提供了有效途径。本研究综述了茶树组织培养技术的发展概况和... 详细信息

茶树是多年生异花授粉植物,具有较高的经济价值和饮用价值。植物组织培养技术为茶树种质资源离体保存、快速繁殖、遗传转化、多倍体育种、基因功能研究和次生代谢产物生产等提供了有效途径。本研究综述了茶树组织培养技术的发展概况和增殖、生根的主要影响因素,重点分析了组培过程中易出现的褐化、污染等问题及对策,并展望了茶树组织培养的主要应用前景,以期为茶树种质资源综合利用提供一定的参考。

关键词：茶树组织培养对策应用

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

海南省火龙果园病虫害防治药剂的使用与登记现状

引用

中国植保导刊 2024年第7期44卷 75-79页

作者：王家林李艳周建利李华东海南省三亚市热带作物技术推广服务中心海南三亚572000 中化化肥有限公司海南分公司海南海口570228 南京蓝景生物科技有限公司江苏南京210000 中化(海南)农业生态有限公司海南三亚572000

为增加对海南省火龙果园杀虫剂、杀菌剂使用状况的了解,开展实地调查,记录整理火龙果常见病虫害种类及防治用药实情,并通过检索汇总我国农药信息网相关信息,梳理出我国用于火龙果的农药登记现状,基于我国现行标准《食品安全国家标准食... 详细信息

为增加对海南省火龙果园杀虫剂、杀菌剂使用状况的了解,开展实地调查,记录整理火龙果常见病虫害种类及防治用药实情,并通过检索汇总我国农药信息网相关信息,梳理出我国用于火龙果的农药登记现状,基于我国现行标准《食品安全国家标准食品中农药最大残留限量》(GB 2763—2021)中火龙果相关农药最大残留限量指标,分析火龙果病虫害化学防治中可能存在的农药质量安全隐患,提出具有针对性的建议。

关键词：火龙果用药调查农药登记最大残留限量

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

结节性硬化症^(18)F-FDG PET/CT显像1例及文献回顾

引用

国际放射医学核医学杂志 2024年第6期48卷 400-402页

作者：王春笛周建立山东大学齐鲁医院德州医院核医学科德州253000

结节性硬化症(TSC)是一种常染色体显性遗传疾病,大约1/3为家族性、2/3为散发性。TSC常累及中枢神经系统、皮肤、肾脏、双肺和心脏等,亦可累及全身骨质。笔者报道了1例中老年女性TSC患者的^(18)F-氟脱氧葡萄糖(FDG)PET/CT影像表现,并通... 详细信息

结节性硬化症(TSC)是一种常染色体显性遗传疾病,大约1/3为家族性、2/3为散发性。TSC常累及中枢神经系统、皮肤、肾脏、双肺和心脏等,亦可累及全身骨质。笔者报道了1例中老年女性TSC患者的^(18)F-氟脱氧葡萄糖(FDG)PET/CT影像表现,并通过文献回顾总结了TSC^(18)F-FDG PET/CT影像表现及诊断要点。关于TSC的^(18)F-FDG PET/CT检查的报道并不多,而该病的诊断主要依赖影像学检查,因此充分了解该病的影像表现,可以更加精准地做出诊断。

关键词：氟脱氧葡萄糖结节性硬化症影像表现 PET/CT显像中枢神经系统文献回顾影像学检查中老年女性

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

Microbial chassis design and engineering for production of amino acids used in food industry

引用

Systems Microbiology and Biomanufacturing 2023年第1期3卷 28-48页

作者： jianli wang Wenjian Ma Jingwen zhou Xiaoyuan wang State Key Laboratory of Food Science and Technology Jiangnan University1800 Lihu AvenueWuxi 214000China International Joint Laboratory on Food Safety Jiangnan UniversityWuxi 214122China Science Center for Future Foods Jiangnan UniversityWuxi 214122China Key Laboratory of Industrial Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxi 214122China

Rational microbial chassis design and engineering for improving production of amino acids have attracted a considerable attention.l-glutamate,l-lysine,l-threonine and l-tryptophan are the main amino acids demanded in the food *** metabolic engineering and synthetic biology engineering generally are believed as the comprehensive engineering approaches to obtain rationally designed strains and construct high-performance platforms for amino *** strate-gies focus on microbial chassis characterization optimization,precise metabolic engineering such as promoter engineer-ing,modular pathway engineering,transporter engineering,and dynamic switch systems application,and global genome streamline engineering to reduce cell *** this review,we summarized the efficient engineering strategies to optimize Corynebacterium glutamicum and Escherichia coli cell factories for improving the production of l-glutamate,l-lysine,l-threonine,and l-tryptophan.

关键词： Microbial chassis Amino acids Food industries Synthetic biology Metabolic engineering Escherichia coli Corynebacterium glutamicum l-Glutamate l-Lysine l-Threonine l-Tryptophan

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

叙事医学视域下现代病历的人文反思

引用

医学与哲学 2024年第18期45卷 50-54页

作者：李飞宁晓红李乃适王剑利周家欣何仲北京协和医学院人文和社会科学学院北京100730 北京协和医院缓和医学中心北京100730 北京协和医院病案科/内分泌科北京100730 中国社会科学院世界宗教研究所北京100005

在对反思概念深入理解基础上,聚焦于病历书写实践,强调了叙事医学对现行病历功能缺失的审视。以临床实践的病历书写为路径,借由叙事医学的视角对病历的功能、价值和意义进行分层次的阐释,亦可能对叙事医学的临床落地作出重要贡献。通过... 详细信息

在对反思概念深入理解基础上,聚焦于病历书写实践,强调了叙事医学对现行病历功能缺失的审视。以临床实践的病历书写为路径,借由叙事医学的视角对病历的功能、价值和意义进行分层次的阐释,亦可能对叙事医学的临床落地作出重要贡献。通过焦点小组访谈和专家访谈等形式,围绕临床实践中的现行病历书写经验,考量医学人文属性在制度化空间流转的可能路径等主题。病历书写实践被裹挟于多重影响因素中,病历书写和流转过程存在一定的矛盾和张力。研究借鉴人类学的“整体性”概念,对病历书写实践进行不同层次的反思,旨在进一步确立起方法论意义,为引导医学界形成叙事医学临床路径的一般性框架和多种可能性作出贡献。

关键词：叙事医学叙事病历叙事缓和医疗平行病历

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

Response of leaf carbon metabolism and dry matter accumulation to density and row spacing in two rapeseed(Brassica napus L.)genotypes with differing plant architectures

引用

The Crop Journal 2022年第3期10卷 680-691页

作者： Jie Kuai Xiaoyong Li jianli Ji Zhen Li Yan Xie Bo wang Guangsheng zhou MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina Oil Crops Research Institute of Chinese Academy of Agricultural Sciences Wuhan 430070HubeiChina College of Agriculture Jinhua Polytechni3Jinhua 321007ZhejiangChina Haimen Municipal Guidance Station for Crop Cultivation and Technology Haimen 226100JiangsuChina

Biological yield indicates the potential for increasing *** carbon metabolism plays an important role in the biomass accumulation of rapeseed(Brassica napus L.).Field experiments with the hybrid HZ62(with a conventional plant architecture)grown in 2016–2017,and HZ62 and accession 1301(with a compact plant architecture)grown in 2017–2018 were conducted to characterize the physiological and proteomic responses of leaf photosynthetic carbon metabolism to density and row spacing *** densities were set at 15×10;ha^(-1)(D1),30×10^(4)ha^(-1)(D2),and 45×10^(4)ha^(-1)(D3)(main plot),with row spacings of 15 cm(R15),25 cm(R25),and 35 cm(R35)(subplot).Individual and plant population biomass accumulation was greatest at R25,R15,and R15 for D1,D2,and D3,respectively,for both *** comparison with D1 R25,the individual aboveground biomass of HZ62 decreased by60.2%,whereas the population biomass increased by 31.9%,and the individual biomass of genotype1301 decreased by 54.0%and the population biomass increased by 53.9%at D3 *** carbon metabolic enzymes varied between genotypes at flowering *** contrast to D1 R25,at D3 R15 the activities of ribulose-1,5-bisphosphate carboxylase/oxygenase(Rubisco)and sucrose phosphate synthase(SPS)and the contents of starch,sucrose and soluble sugars in leaves were significantly decreased in HZ62 and increased in genotype *** activities of fructose-1,6-bisphosphatase(FBPase)decreased,in consistency with the abundance of fructose-bisphosphate aldolase in *** contrast,sucrose synthase(Su Sy)activity appeared to decrease in both genotypes,but a significant increase in abundance of a protein with sucrose synthase was found in the 1301 genotype by proteomic *** increased density and reduced row spacing,the expression of most key proteins involved in carbon metabolism was elevated,and enzyme activity and carbon assimilate content were increased in 1301,whereas HZ62 showed the opposite trend,indicati

关键词： Rapeseed Density Row spacing Dry matter Leaf carbon metabolism

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：