检索结果-南通市图书馆

Pea leafminer Liriomyza huidobrensis (Diptera: Agromyzidae) uses vibrational duets for efficient sexual communication

引用

Insect Science 2019年第3期26卷 510-522页

作者： Jin Ge Jia-Ning Wei Ding-Jie Zhang chun hi De-Zhi Zheng Le Kang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Key Laboratory of Zoological Systematics and Evolution Institute of Zoology Chinese Academy of Sciences Beijing China School of Instrumentation Science & Optoelectronics Engineering Beihang University Beijing China Beijing Institutes of Life Science Chinese Academy of Sciences Beijing China

The pea leafminer (Liriomyza huidobrensis) is a notorious pest of vegetables and ornamental plants worldwide. Despite a large number of studies on its biology and ecology, the courtship behavior and sexual communication of this species remain unclear. Here, we studied vibrational communication in the sexual interaction of the pea leafminer. On host plant leaves, females and males behaviorally displayed the bobbing-quivering alternation, which finally led to copulation. Moreover, records of laser vibrometry revealed threesignal duets underlying the behavioral alternation. Sexually mature males spontaneously emitted calls (MCs) to initiate the duets. The females rapidly responded to MCs by emitting replies (FRs) that are longer in duration. The FRs further triggered male replies (MRs) in their search for potential partners. Leafminer-produced vibrational signals convey efficient information to partners and generate pair formation on stretched substrates, such as plant leaves and nylon mesh, but cannot elicit responses on dense substrates, such as glass and plastic. Vibrational playbacks of both MCs and FRs can elicit replies in females and males, respectively. This study completely characterizes substrate-borne vibrational duets in a dipteran insect. The discovery of vibrational sex signals in the pea leafminer provides new insights for the development of novel approaches to control the pest and its relative species.

关键词： biotremology courtship behavior Liriomyza vibrational communication

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

Novel Model for Intrusion Detection

引用

Wuhan University Journal of Natural Sciences 2003年第01A期8卷 46-50页

作者： Li Jia\|chun, Li Z hi\|tang School of Computer Science and Techno logy, Huazhong University of Science and Te chnology, Wuhan 430074, Hubei, China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei China

It's very difficult tha t the traditional intrusion detection methods based on accurate match adapt to the blur and uncertainty of user information and expert knowledge, it results in failing to report the variations of attack signature. In addition security itself includes fuzziness, the judgment standard of confidentiality, integrity and availability of system resource is uncertain. In this paper fuzzy intrusion detection based on partial match is presented to detect some types of attacks availably and alleviate some of the difficulties of above approaches, the architecture of fuzzy intrusion detection system(FIDS) is introduced and its performance is analyzed.

关键词： intrusion detection fuzzy fuzzy expert system genetic algorithm

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

《计算机组成原理》课程教学探讨

引用

攀枝花学院学报 2008年第6期25卷 101-103页

作者：张俞玲严春来丽江师范高等专科学校计算机科学系云南丽江671000 攀枝花学院计算机学院四川攀枝花617000

《计算机组成原理》是计算机各专业的一门专业基础课程,在专业课中起着承上启下的作用。文章从教学方法、教学媒体、教学评价的角度对《计算机组成原理》课程的教学进行了探讨,加强《计算机组成原理》课程的教学建设。

关键词：计算机组成原理多媒体教学实验教学

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

红外光谱法测定丙烯酰与醋酸乙烯酯共聚物的竞聚率及序列分布

引用

齐齐哈尔轻工学院学报 1986年第4期 47-52页

作者：郭德经桑长春张海齐齐哈尔轻工学院化工系

本文是根据醋酸乙烯酯的羰基伸缩振动频率位移与单体在共聚物中联接几年的关系,在无己知组成的共聚物的条件下,采用不纯样的定量分析方法,选用1740cm-1和1660cm-1峰进行共聚物的红外光谱测定,进而求出两单体的竞聚率及其共聚物的序列分布。

关键词：共聚物竞聚率序列分布红外光谱法红外分光光度法吸收光谱法丙烯酰乙烯酯醋酸乙酸

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

羊肚菌与盘菌相关性初探

引用

中国食用菌 2020年第8期39卷 17-19页

作者：李建英刘春丽尚陆娥杨珍福罗孝坤刘绍雄云南省供销合作社科学研究所云南昆明650221 中华全国供销合作总社昆明食用菌研究所云南昆明650221

通过分析羊肚菌(Morchella spp.)产量和盘菌数量的关系、不同品种羊肚菌和盘菌的关系,结合羊肚菌和盘菌的菌丝拮抗试验,分析了盘菌和羊肚菌的相关性。结果显示,盘菌数量和羊肚菌产量间没有相关性,盘菌和羊肚菌菌种、品种间也没有特异性... 详细信息

通过分析羊肚菌(Morchella spp.)产量和盘菌数量的关系、不同品种羊肚菌和盘菌的关系,结合羊肚菌和盘菌的菌丝拮抗试验,分析了盘菌和羊肚菌的相关性。结果显示,盘菌数量和羊肚菌产量间没有相关性,盘菌和羊肚菌菌种、品种间也没有特异性,但盘菌和羊肚菌菌丝间没有拮抗反应,满足作为伴生菌的菌丝生长特性。

关键词：羊肚菌拮抗试验盘菌

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

Hydrodynamic characteristics of a four-compartment periodic anaerobic baffled reactor

引用

Journal of Environmental Sciences 2007年第10期19卷 1159-1165页

作者： LIU Xiao-lei REN Nan-qi WAN chun-li School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Water Conservancy and Environment Engineering Changchun Institute of Technology Changchun 130012 China

Periodic anaerobic baffled reactor （PABR） is a novel reactor based on the design concept of anaerobic baffled reactor （ABR）. Residence time distribution （RTD） studies on both clean and working reactors at the same hydraulic residence time （HRT） of 2 d were carded out to investigate the dead spaces and mixing patterns in PABRs at different organic loading rates （OLRs） in various switching manners and frequencies. The results showed that the fraction of dead space in PABR was similar to that in ABR, which was low in comparison with other reactor designs. Dead space may be divided into two categories, hydraulic and biological. In RTD studies without biomass, the hydraulic dead space in the PABR run in an ＂every second＂ switching manner with T = 2 d was the lowest whereas that in the PABR run in a T = ∞ （ABR） switching manner was the highest. The same trend was obtained with the total dead space in RTD studies with biomass no matter what the OLR was. Biological dead space was the major contributor to dead space but affected decreasingly at higher OLR whichever switching manner the PABR run in. The flow patterns within the PABRs were intermediate between plug-flow and perfectly mixed under all the conditions tested,

关键词： dead space residence time distribution periodic anaerobic baffled reactor anaerobic processes wastewater treatment

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

Design of adaptive deblocking filter for H.264/AVC decoder SOC

引用

The Journal of China Universities of Posts and Telecommunications 2009年第1期16卷 91-94,110页

作者： YANG Kun ZHANG chun WANG Zhi-hua Electronic Engineering Department Tsinghua University Beijing 100084 China Institute of Microelectronics Tsinghua University Beijing 100084 China

In this article, a design for the adaptive deblocking filter is proposed. To understand the real-time performance, a FILTER unit that can process eight pixels beside an edge simultaneously is applied in this design to increase filtering efficiency, and local memory is used to store all temporary data generated by the FILTER to reduce access to system bus. The filter makes every 4×4 sample block pipelined through the process units and achieves an efficiency of 80% for both the FILTER unit and the bus access unit. It can fulfill filtering process for a crystallographic information file （CIF, 352×288） format picture in 95 k clock cycles. The proposed design is part of a H.264/AVC decoder system-on-chip （SOC）, which is fabricated in 0.18 μm complementary metal oxide semiconductor （CMOS） process. The filter module consists of 60 k gates and 25.7 kb static random access memory （SRAM） and it can filter a macro-block in 240 clock cycles.

关键词： H2.64/AVC deblocking filtering ASIC

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

Web service composition algorithm based on TOPSIS

引用

The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 89-97页

作者： ZHANG Long-chang ZOU Hua YANG Fang-chun School of Marketing Management Liaoning Technical University Huludao 125105 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Independent quality of service （QoS） registration center is difficult to monitor QoS with lots of requests in Intemet environment with a large number of services and lots of service requests. It is able to reduce the load and decrease the failure rate by using multiple QoS registration centers to monitor QoS of some services with lots of requests. In addition, the heterogeneous QoS data close to user＇s habitual expression and adapts to the environment with complexity and uncertainty. This paper introduces a novel Web service composition algorithm based on technique for order preference by similarity to an ideal solution （TOPSIS）（WSCA TOPSIS） to solve the above difficulties for the fu＇st time. WSCA TOPSIS can support multiple decision-makers and heterogeneous QoS data. It includes three main steps： normalizing decision matrix, evaluating alternatives synthetically and evaluating group alternatives synthetically. Other contributions of the paper include a novel algorithm of aggregating QoS and a set of experiments that demonstrate the benefits and effectiveness of our approach. Experimental results show that the proposed algorithm can better support Web service composition with heterogeneous QoS data and multiple decision-makers.

关键词： Web service service composition TOPSIS QoS multiple decision-makers

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

Dynamic control approaches of spectrum sensing in multi-band cognitive radio networks

引用

The Journal of China Universities of Posts and Telecommunications 2010年第5期17卷 20-25页

作者： AN chun-yan JI Hong SI Peng-bo MAO Xu College of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China College of Electronics Information and Control Engineering Beijing University of Technology Beijing 100022 China

In this paper,the dynamic control approaches for spectrum sensing are proposed,based on the theory that prediction is synonymous with data compression in computational ***,a spectrum sensing sequence prediction scheme is proposed to reduce the spectrum sensing time and improve the throughput of secondary *** use Ziv-Lempel data compression algorithm to design the prediction scheme,where spectrum band usage history is *** addition,an iterative algorithm to find out the optimal number of spectrum bands allowed to sense is proposed,with the aim of maximizing the expected net reward of each secondary user in each time ***,extensive simulation results are shown to demonstrate the effectiveness of the proposed dynamic control approaches of spectrum sensing.

关键词： spectrum sensing sequence optimal number of spectrum bands cognitive radio networks Ziv-Lempel algorithm

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

Atomic Hardy-type Spaces between H1 and L1 on Metric Spaces with Non-doubling Measures

引用

Acta Mathematica Sinica,English Series 2011年第12期27卷 2445-2468页

作者： Li Guang LIU Da chun YANG Dong Yong YANG School of Mathematical Sciences Beijing Normal UniversityLaboratory. of Mathematics and Complex Systems Ministry of EducationBeijing 100875 P. R. China

Let （y, d, dλ） be （Rn, ｜·｜,μ）, where ｜·｜ is the Euclidean distance, μ is a nonnegative Radon measure on Rn satisfying the polynomial growth condition, or the Gauss measure metric space （Rn, ｜·｜,dγ）, or the space （S, d, p）, where S - Rn×R＋ is the （ax ＋ b）-group, d is the left-invariant Riemannian metric and p is the right Haar measure on S with exponential growth. In this paper, the authors introduce and establish some properties of the atomic Hardy-type spaces {Xs（Y））0〈s≤∞ and the BM0-type spaces {BM0（y, s）}0〈s≤∞. Let hi（Y） be the known atomic Hardy space and L01（y） the subspace of f ∈ L1（Y） with integral 0. The authors prove that the dual space of Xs（Y） is SM0（Y,s） when s∈ （0, ∞）, Xs（Y） = H1（Y） when s ∈ （0, 1], and X∞（y） = L01（Y）（or L1（Y））. As applications, the authors show that if T is a linear operator bounded from H1 （Y） to L1 （Y） and from L1（y） to L1,∞（Y）, then for all r ∈ （1, ∞） and s ∈ （r, ∞], T is bounded from Xr（y） to the Lorentz space L1,8（y）, which applies to the Calderon-Zygmund operator on （Rn, ｜·｜,μ）, the imaginary powers of the 0rnstein-Uhlenbeck operator on （Rn, ｜·｜,dγ） and the spectral operator associated with the spectral multiplier on （S, d, p）. All these results generalize the corresponding results of Sweezy, Abu-Shammala and Torchinsky on Euclidean spaces.

关键词： Non-doubling measure polynomial growth Gauss measure (ax + b)-group atomicHardy-type space BMO-type space operator

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：