检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

新疆塔里木盆地叶城沙蜥的两性异形

野生动物学报 2020年第1期41卷 182-188页

作者：曹立知周天海李俊牛忠泽柴永斌杨维康徐峰中国科学院新疆生态与地理研究所中科院干旱区生物地理与生物资源重点实验室乌鲁木齐830011 中国科学考察志愿者联盟北京100062 中国人民大学附属中学北京100080 北京市第八中学北京100033 新疆大学生命科学与技术学院乌鲁木齐830000

叶城沙蜥是一种主要分布于中国新疆南部地区的蜥蜴,通过测量和比较采自新疆塔里木盆地且末县叶城沙蜥的个体大小以及口宽等8个形态特征,研究了叶城沙蜥的两性异形。研究共采集叶城沙蜥62只,其中成年雌性个体27只,雄性个体35只。结果显示... 详细信息

叶城沙蜥是一种主要分布于中国新疆南部地区的蜥蜴,通过测量和比较采自新疆塔里木盆地且末县叶城沙蜥的个体大小以及口宽等8个形态特征,研究了叶城沙蜥的两性异形。研究共采集叶城沙蜥62只,其中成年雌性个体27只,雄性个体35只。结果显示:(1)叶城沙蜥雌雄性成体的体长有显著差异,雄性大于雌性,表明叶城沙蜥具有雄性偏大的两性异形模式;(2)叶城沙蜥其他身体形态特征中尾长、腹长和头长3个特征有显著差异,其中雄性的尾长和头长大于雌性,而雌性的腹长大于雄性;(3)叶城沙蜥雌雄性个体间的口宽、眼间距等其他形态特征则没有显著差异。叶城沙蜥的两性异形表现为雄性大于雌性,并且雄性具有更大的头部和更长的尾部,雌性具有更长有腹部,这可能是雄性个体面临的性选择压力与雌性个体面临的繁殖压力共同作用的结果。

关键词：叶城沙蜥两性异形尾长性选择蜥蜴中亚

DTFLOW:Inference and Visualization of Single-cell Pseudotime Trajectory Using Diffusion Propagation

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2021年第2期19卷 306-318页

作者： Jiangyong Wei Tianshou zhou Xinan Zhang tianhai Tian College of Science Huazhong Agricultural UniversityWuhan 430070China School of Statistics and Mathematics Zhongnan University of Economics and LawWuhan 430073China School of Mathematics and Statistics Sun Yat-sen UniversityGuangzhou 510275China School of Mathematics and Statistics Central China Normal UniversityWuhan 430079China School of Mathematics Monash UniversityMelbourneVIC 3800Australia

One of the major challenges in single-cell data analysis is the determination of cellular developmental trajectories using single-cell *** substantial studies have been conducted in recent years,more effective methods are still strongly needed to infer the developmental processes *** work devises a new method,named DTFLOW,for determining the pseudotemporal trajectories with multiple *** consists of two major steps:a new method called Bhattacharyya kernel feature decomposition(BKFD)to reduce the data dimensions,and a novel approach named Reverse Searching on k-nearest neighbor graph(RSKG)to identify the multi-branching processes of cellular *** BKFD,we first establish a stationary distribution for each cell to represent the transition of cellular developmental states based on the random walk with restart algorithm,and then propose a new distance metric for calculating pseudotime of single cells by introducing the Bhattacharyya kernel *** effectiveness of DTFLOW is rigorously examined by using four single-cell *** compare the efficiency of DTFLOW with the published state-of-the-art *** results suggest that DTFLOW has superior accuracy and strong robustness properties for constructing pseudotime *** Python source code of DTFLOW can be freely accessed at https://***/statway/DTFLOW.

关键词： Single-cell heterogeneity Pseudotime trajectory Manifold learning Bhattacharyya kernel

Prediction of job characteristics for intelligent resource allocation in HPC systems:a survey and future directions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2022年第5期16卷 17-33页

作者： Zhengxiong HOU Hong SHEN Xingshe zhou Jianhua GU Yunlan WANG tianhai ZHAO Center for High Performance Computing School of Computer ScienceNorthwestern Polytechnical UniversityXi’an 710072China School of Computer Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

Nowadays,high-performance computing(HPC)clusters are increasingly *** volumes of job logs recording many years of operation traces have been *** the same time,the HPC cloud makes it possible to access HPC services *** executing applications,both HPC end-users and cloud users need to request specific resources for different workloads by *** users are usually not familiar with the hardware details and software layers,as well as the performance behavior of the underlying HPC *** is hard for them to select optimal resource configurations in terms of performance,cost,and energy ***,how to provide on-demand services with intelligent resource allocation is a critical issue in the HPC *** of job characteristics plays a key role for intelligent resource *** paper presents a survey of the existing work and future directions for prediction of job characteristics for intelligent resource allocation in HPC *** first review the existing techniques in obtaining performance and energy consumption data of *** we survey the techniques for single-objective oriented predictions on runtime,queue time,power and energy consumption,cost and optimal resource configuration for input jobs,as well as multi-objective oriented *** conclude after discussing future trends,research challenges and possible solutions towards intelligent resource allocation in HPC systems.

关键词： high-performance computing performance prediction job characteristics intelligent resource allocation cloud computing machine learning

Capacity and Flexibility Improvement of Traffic Aggregation for Fixed 5G:Key Enabling Technologies,Challenges and Trends

在线全文

学校读者我要写书评

暂无评论

China Communications 2022年第12期19卷 1-13页

作者： Jing Zhang tianhai Chang Zhuqiang Zhong Xianqing Jin Shaohua Hu Taowei Jin Jiahao zhou Mingyue Zhu Yi Yu Jianming Tang Liangchuan Li Kun Qiu School of Communication and Information Engineering University of Electronic Science and Technology of ChinaChengduSichuan 611731China Optical Research Dept Huawei Technologies518129ShenzhenChina School of Electronic Engineering Bangor UniversityBangorLL571UTUK

As the emergence of various highbandwidth services and the requirements to support 5G/Wi-Fi 6 wireless networks,the next generation fixed networks,i.e.F5G,are expected to be realized in the 5G era.F5G is endowed with new characteristics,including ultra-high bandwidth,all-optical connections and optimal service *** the prospect of optical-to-everywhere,optical technologies are used for mobile front-haul,mid-haul,and *** access networks would play an important role in F5G to support radio access network and fixed access ***-latency PON is a key for cost effective-haul traffic *** terms of signal transmission,intensity modulation directdetection(IM-DD)is a promising scheme due to its simple *** fundamental challenge associated with direct-detection is the disappearance of the transmitted signal’s *** access network,the flexibility and low latency are the two key factors affecting service *** this article,we review the evolution of PONs and the challenges of current PONs in *** analyze key enabling digital signal processing(DSP)techniques,including detection linearization for direct-detection and simplified coherent detection,adaptive equalizers,digital filer enabled flexible access network and low-latency inter-ONU ***,we discuss the developing trends of future optical access networks.

关键词： optical fiber communication flexible access network optical field recovery inter-ONU communication

The Application of GNSS to Fault Deformation Studies

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 2014年第4期28卷 510-519页

作者： Bo Wanju Feng Shengtao Su Jianfeng zhou Haitao Du Xuesong Wan Wenni Liu tianhai The First Crustal Deformation Monitoring and Application Center CEA National Earthquake Response Support Service

Great earthquakes often occur along or near active fault belts. Thus,monitoring and research on fault deformation are quite important. Methods such as short-leveling,shortbaseline and integrated monitoring profile across fault belts have been used to monitor fault activities for many years. GNSS observations are mainly used to obtain the horizontal velocity field in large areas and to study the activities and deformation of major *** technology has been used to monitor and study the deformation of faults from a different aspects. In this paper,some applications and new explorations of GNSS are discussed. They are:( 1) Research and monitoring of strike-slip activities of faults with GNSS.( 2) Research and monitoring of vertical activities of faults with GNSS.( 3)Investigating the laws of deformation of blocks on the sides of fault zone and setting up strain models to deduce the activities and deformation of faults with respective models and compare the deduced results with the actual measurements across fault. It is concluded that a larger discrepancy between the deduced and the observed deformation indicates a stronger interaction between the blocks,which can be important for predicting the location of a strong earthquake and assessing seismic hazard,as well as the seismicity trend.

关键词： GNSS Fault deformation Baseline Leveling Seismicity Crust block

关于上海“互联网+”智慧能源技术产业发展的思考

在线全文

学校读者我要写书评

暂无评论

可再生能源 2018年第1期36卷 126-132页

作者：刘惠萍杨天海周小玲上海市发展改革研究院上海200032 上海明华电力技术工程有限公司上海200090 上海市科学学研究所上海200235

文章立足于上海发展"互联网+"智慧能源的基础与需求,结合上海"互联网+"智慧能源技术产业发展指南的研究和编制,提出了上海未来"互联网+"智慧能源技术产业发展的重点技术方向和典型应用情景,以期为国家"互联网+"智慧能源示范引领、技术... 详细信息

文章立足于上海发展"互联网+"智慧能源的基础与需求,结合上海"互联网+"智慧能源技术产业发展指南的研究和编制,提出了上海未来"互联网+"智慧能源技术产业发展的重点技术方向和典型应用情景,以期为国家"互联网+"智慧能源示范引领、技术研发和产业应用提供支撑。

关键词： “互联网+” 智慧能源产业发展情景应用

在线全文

学校读者我要写书评

暂无评论

考虑老化一致性的电池模组热管理方法研究

电源技术 2024年第6期48卷 1103-1108页

作者：耿察民张天海杨小龙周月江苏方天电力技术有限公司江苏南京211102 南京成瑞科技有限责任公司江苏南京210000

锂离子电池内部生热导致的加速老化和热安全问题一直以来都是制约电池产业的瓶颈问题。此外,单体老化路径和一致性的差异也会造成电池老化程度不一致,引发电池内阻和发热量的差异。基于上述问题,提出了一种考虑老化一致性的电池组热管... 详细信息

锂离子电池内部生热导致的加速老化和热安全问题一直以来都是制约电池产业的瓶颈问题。此外,单体老化路径和一致性的差异也会造成电池老化程度不一致,引发电池内阻和发热量的差异。基于上述问题,提出了一种考虑老化一致性的电池组热管理方法,搭建锂离子电池热-电耦合模型对电池进行参数辨识,并利用有限元分析的方法对Z型槽空气冷却电池组进行三维建模。分析不同外界电流应力、入口风速以及不同老化状态对电池组温度分布的影响。进行了仿真与实验验证,结果表明实验与仿真温度结果误差在2℃以内。

关键词：锂离子电池电池老化热-电耦合模型

在线全文

学校读者我要写书评

暂无评论

夜间光照度变化对灰茶尺蠖生物学特性的影响

江苏农业学报 2024年第9期40卷 1617-1622页

作者：乔利张天海蒋月丽周洲周国涛耿书宝金银利信阳农林学院农学院河南信阳464000 河南省农业科学院植物保护研究所河南郑州450002 河南云飞科技发展有限公司河南郑州450003

为了探究夜间不同光照度对灰茶尺蠖生物学特性的影响,为茶园科学应用灯光防治害虫提供参考,本研究设置LED灯光6个光照度(分别为40 lx、80 lx、120 lx、160 lx、200 lx和240 lx)处理和1个白色自然光(150~200 lx)对照,观察记录不同光照对... 详细信息

为了探究夜间不同光照度对灰茶尺蠖生物学特性的影响,为茶园科学应用灯光防治害虫提供参考,本研究设置LED灯光6个光照度(分别为40 lx、80 lx、120 lx、160 lx、200 lx和240 lx)处理和1个白色自然光(150~200 lx)对照,观察记录不同光照对灰茶尺蠖幼虫发育历期、存活率、化蛹率、单蛹重、羽化率、成虫发育历期及产卵的影响。结果显示,与对照相比6个光照度对灰茶尺蠖各龄期幼虫发育历期均有不同程度的影响,其中240 lx光照度处理下发育总历期最短;240 lx光照度处理下5龄幼虫存活率最低,羽化率显著低于对照;光照处理对雄成虫寿命影响较雌成虫显著;随着光照度增加,灰茶尺蠖雌成虫产卵历期逐渐缩短、产卵量不断减少。本研究结果表明,茶园在夜间增加适宜波长光照射可扰乱灰茶尺蠖正常生长历期,抑制其种群发展速度,有效减轻灰茶尺蠖危害。

关键词：茶园灰茶尺蠖光照度生物学特性

Cell softness reveals tumorigenic potential via ITGB8/AKT/glycolysis signaling in a mice model of orthotopic bladder cancer

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

Chinese Medical Journal 2024年第2期137卷 209-221页

作者： Shi Qiu Yaqi Qiu Linghui Deng Ling Nie Liming Ge Xiaonan Zheng Di Jin Kun Jin Xianghong zhou Xingyang Su Boyu Cai Jiakun Li Xiang Tu Lina Gong Liangren Liu Zhenhua Liu Yige Bao Jianzhong Ai tianhai Lin Lu Yang Qiang Wei Department of Urology Institute of UrologyNational Clinical Research Center for Geriatrics and Center of Biomedical Big DataWest China Hospital of Sichuan UniversityChengduSichuan 610041China Department of Molecular Oncology Institute of Oncology Research(IOR)Oncology Institute of Southern Switzerland(IOSI)Bellinzona 6500Switzerland Department of Science and Drug Technology University of TurinTurinItaly National Clinical Research Center of Geriatrics The Center of Gerontology and GeriatricsWest China HospitalSichuan UniversityChengduSichuan 610000China Department of Pathology West China HospitalSichuan UniversityChengduSichuan 610041China Department of Pharmaceutics and Bioengineering School of Chemical EngineeringSichuan UniversityChengduSichuan 610000China

Background:Bladder cancer,characterized by a high potential of tumor recurrence,has high lifelong monitoring and treatment *** date,tumor cells with intrinsic softness have been identified to function as cancer stem cells in several cancer ***,the existence of soft tumor cells in bladder tumors remains ***,our study aimed to develop a microbarrier microfluidic chip to efficiently isolate deformable tumor cells from distinct types of bladder cancer ***:The stiffness of bladder cancer cells was determined by atomic force microscopy(AFM).The modified microfluidic chip was utilized to separate soft cells,and the 3D Matrigel culture system was to maintain the softness of tumor *** patterns of integrinβ8(ITGB8),protein kinase B(AKT),and mammalian target of rapamycin(mTOR)were determined by Western *** immunostaining was conducted to examine the interaction between F-actin and tripartite motif containing 59(TRIM59).The stem-cell-like characteristics of soft cells were explored by colony formation assay and in vivo studies upon xenografted tumor ***:Using our newly designed microfluidic approach,we identified a small fraction of soft tumor cells in bladder cancer *** importantly,the existence of soft tumor cells was confirmed in clinical human bladder cancer specimens,in which the number of soft tumor cells was associated with tumor ***,we demonstrated that the biomechanical stimuli arising from 3D Matrigel activated the F-actin/ITGB8/TRIM59/AKT/mTOR/glycolysis pathways to enhance the softness and tumorigenic capacity of tumor ***,we detected a remarkable up-regulation in ITGB8,TRIM59,and phospho-AKT in clinical bladder recurrent tumors compared with their non-recurrent ***:The ITGB8/TRIM59/AKT/mTOR/glycolysis axis plays a crucial role in modulating tumor softness and ***,the soft tumor cells become more sensitive to chemother

关键词： Soft tumor cells 3D Matrigel Stemness Non-muscle invasive bladder neoplasms Microfluidic analytical techniques