无源滤波器设计与评价软件的开发应用

电网谐波不仅降低了电能质量,还可能引起故障甚至事故。在工程实践中,通常在谐波数据超标的监测点安装无源滤波器。在实际安装之前,无源滤波器参数的设计是个关键。根据监测点实测的谐波数据,以及装置接入点供电系统参数等,本文给出无源滤波器参数设计方案,并进行滤波效果的评价,为供电部门提供参考,为电网谐波问题分析与治理提供参考方案。     

地图聚合模型研究与实现

地图聚合是Mashup的一种重要方式,是当今Web2.0网络应用下新出现的一种现象。本文在AJAX加入GIS网络服务,整合WMS和WFS两种服务的基础上,提出了地图聚合模型。根据本文提出的模型,本研究在MapGuide和GoogleGIS平台支持下,将两种不同的支持WebAPI应用进行堆叠而形成的新型地图Web服务,创建了MapGuide和Google聚合地图,以从MapGuide和Google数据源检索到的内容来创建全新的创新服务,创造出更加增值的数字地图服务。     

移动应用集成管理系统的设计与实现

移动应用管理系统是一套移动应用集成管理系统,该平台可满足政府、企业、高校、物流、电子商务等各领域各类应用系统的集成、开发、迁移、部署,实现随时随地的办公、信息高效交互、业务及时办理、数据推送等功能,真正实现以"用户为中心"的服务模式,为用户提供贴身、便捷、无限的信息化应用服务。     

Applying scenario-based design and claims analysis to the design of a digital library of geography examination resources

This paper describes the application of Carroll’s scenario-based design and claims analysis as a means of refinement to the initial design of a digital library of geographical resources (GeogDL) to prepare Singapore students to take a national examination in geography. GeogDL is built on top of G-Portal, a digital library providing services over geospatial and georeferenced Web content.Beyond improving the initial design of GeogDL, a main contribution of the paper is making explicit the use of Carroll’s strong theory-based but undercapitalized scenario-based design and claims analysis that inspired recommendations for the refinement of GeogDL.The paper concludes with an overview of the implementation of some of the recommendations identified in the study to address “usability” and “usefulness” design issues in GeogDL, and discusses implications of the findings in relation to geospatial digital libraries in general.     

Observer design and stability analysis for a class of PDE chaotic systems

This paper deals with observer design and stability for a class of partial differential equation (PDE) systems governed by one-dimensional wave equations with mixed derivative terms and superlinear boundary conditions, whose dynamics exhibits chaos when the system parameters change within certain ranges. Firstly, a sufficient and necessary condition that guarantees the stability of this class of systems is obtained. Secondly, based on the method of characteristics, an observer is designed by injecting the measurement output estimation error on the boundary, and the observation error dynamics is proved to be stable with a necessary and sufficient criterion, which can identity the range of the feedback gain for the observer. Finally, two numerical examples are provided to illustrate the validity of the theoretical conclusions.     

Adaptive synchronization for a class of faulty and sampling coupled networks with its circuit implement

This paper is concerned with the asymptotic synchronization problem of a class of nonlinear complex networks with faulty and sampling couplings. A new version of the adaptive control strategy is proposed to adjust control parameters to compensate for the adverse impact of network attenuation faults, nonlinearities and sampling errors. Based on the adaptive adjustment laws, an approach that is application of knowledge of electricity is introduced to physically realize the adaptive controllers. Using Lyapunov stability theory for the synchronization error system, asymptotic synchronization of the overall networks can be established for the nonlinearly sampling and faulty couplings. Finally, the proposed adaptive control schemes are tested by simulation on Chua?s circuit network.     

The application of networks in basic computer science and information science research

A list of important criteria for research projects in computer network technology and the application of networking to basic computer and information science research is presented. Ten specific research areas deserving of support are identified. Brief snapshots of each of these research areas are given.     

互联网游戏软件在电视节目中的设计与应用

为了更好的深化解决传统媒体与新媒体的融合问题,南宁电视台自主研发了一套互联网游戏电视播出系统,将“拖拉机”这一棋牌类游戏通过电视这一载体来呈现。该系统具备网络游戏的所有功能,比赛者先通过互联网进入该游戏平台中进行比赛,由此产生的每周冠军进入到电视台的演播室参加直播节目的比赛。通过互联网游戏软件与电视直播设备相结合．将选手在比赛时的出牌技巧、团队配合以及场外网友评论等精彩环节,完整地展现在观众面前。     

Viable immersion and invariance control for a class of nonlinear systems and its application to aero-engines

This paper presents a novel approach to stabilize a class of nonlinear systems with state constraints. The motivation behind this study is the need to develop a stabilizing state feedback controller that does not require the knowledge of Lyapunov function and can regulate the states to the equilibrium while meeting the constraints. By using an integration of two relatively new tools: immersion and invariance (I&I) theory and viability theory, a sufficient condition for stability and stabilizability of a general nonlinear affine system with state constraints is derived; Then, the related results are exploited to stabilize a class of nonlinear system in feedback form and with state constraints represented by inequalities and the viable I&I stabilizing state feedback controller is obtained constructively. Further, an application to a nonlinear aero-engine model with the temperature constraint is given to illustrate the applicability and the effectiveness of the proposed method. Finally, a comparative simulation is presented, highlighting the advantages of the viable I&I controller.     

Synchronization of fractional-order spatiotemporal complex-valued neural networks in finite-time interval and its application

This paper focuses on the synchronization of fractional-order complex-valued neural networks (FOCVNNs) with reaction–diffusion terms in finite-time interval. Different from the existing complex-valued neural networks (CVNNs), the reaction–diffusion phenomena and fractional derivative are first considered into the system, meanwhile, the parameter switching (the system parameters will switch with the state) is considered, which makes the presented model more comprehensive. By choosing an appropriate Lyapunov function, the driver and response systems achieve Mittag-Leffler synchronization under a suitable controller. In addition, based on the fractional calculus theorem and the basic inequality methods, a criterion of synchronization for the error system in finite-time interval is derived and the upper bound of the corresponding finite synchronization time can be obtained. Finally, two examples are provided, one is a numerical example to explain the effectiveness of the main results, and the other shows that the results of this paper can be applied to image encryption for any size with high-security coefficient.     

User acceptance of a digital library system in developing countries: An application of the Technology Acceptance Model

This study examines the factors that influence people's adoption and use of a digital library system and tests the applicability of the Technology Acceptance Model (TAM) in the context of developing countries. Using data from a survey of 16 institutions in Africa, Asia, and Central/Latin America (N = 1082), a path analysis revealed that perceived ease of use of the library system had a significant impact on perceived usefulness, which ultimately led to behavioral intention to use. In addition, the study examined the similarities and differences in the significant predictors of the digital library acceptance across countries and continents. Further, the current study suggests that external variables that affect perceived ease of use and usefulness need to be considered as important factors in the process of designing, implementing, and operating digital library systems. Such consideration will help decrease the mismatch between system design and local users’ realities, and further facilitate the successful adoption of digital library systems in developing countries.     

设计类专业实验室开放过程中存在的问题分析探讨

实验室的开放能够激发学生主动学习的热情,对于提高教学质量、人才培养意义显著。但随着实验开放的内容的不断更新、开放方式及开放人次的增加,也产生了一些新的问题。结合设计类专业实验室的特点,以管理者的视角,分别从实验室开放的管理过程、安全问题、经费保障、考评机制等方面对实验室开放过程中存在的问题加以阐述和分析,指出当前实验室开放过程中存在的问题,并提出相应解决办法,为实验室管理者提供参考。     

T1804柴油流动改进剂在柴达木盆地直馏柴油降凝方面的研究

柴达木盆地直馏馏分油加入柴油流动改进剂后,降凝效果明显,冷滤点变化不大,进行的加剂降凝实验成功地生产出－１０号、－２０号柴油。     

A study of the information needs of the users of a folk music library and the implications for the design of a digital library system

A qualitative study of user information needs is reported, based on a purposive sample of users and potential users of the Vaughan Williams Memorial Library, a small specialist folk music library in North London. The study set out to establish what the users’ (both existing and potential) information needs are, so that the library’s online service may take them into account with its design. The information needs framework proposed by Nicholas [Nicholas, D. (2000) Assessing information needs: tools, techniques and concepts for the internet age. London: ASLIB] is used as an analytical tool to achieve this end. The demographics of the users were examined in order to establish four user groups: Performer, Academic, Professional and Enthusiast. Important information needs were found to be based on social interaction, and key resources of the library were its staff, the concentration of the collection and the library’s social nature. A collection of broad design requirements are proposed based on the analysis and this study also provides some insights into the issue of musical relevance, which are discussed.     

QFD及模糊综合评价在产品概念设计中的模拟应用

产品概念设计的成功与否决定了最终产品的质量优劣及市场竞争能力。本文采用QFD模型对手机产品进行概念设计,QFD是最能反映顾客声音的一种方法,提出产品的设计方案后,需要对各项备选方案进行综合评价,本文根据AHP方法生成方案评价的指标体系,并在此基础上运用模糊评价的方法对手机产品的设计方案进行综合评价,评价结果显示:使用文中提出的方案设计的手机质量良好。     

双薄壁高墩施工爬架的设计及应用

爬架施工一般应用于斜拉桥或悬索桥的高塔塔柱施工,而很少用于一般墩身施工。本文结合工程的实际和爬架的应用,阐述双薄壁高墩施工爬架的设计、主要构造及操作过程。     

国防科技重点实验室技术转移的制约因素及对策

国防科技重点实验室技术转移存在"被动转移""不愿转移""不能转移"等典型问题。在大量调研的基础上,归纳国防科技重点实验室技术转移的制约因素,深入分析制约技术转移的体制性障碍、结构性矛盾和政策性问题。在此基础上提出破解制约因素的对策建议:完善政策体系,优化技术转移生态系统;健全组织体系,建立技术转移基础架构;构建信息平台,促进技术转移供需对接;加强机制创新,拓宽技术转移扩散通道。     

Universal adaptive regulation for a class of nonlinear systems with unknown time delays and output function via output feedback

This paper investigates the adaptive output feedback control problem for a class of nonlinear systems with unknown time delays and output function. The system satisfies linear growth condition with an unknown growth rate. First of all, based on a dynamic gain scaling technique, we present a new dynamic high-gain observer without requiring precise information of the output function. Then, by employing the idea of universal control and the backstepping method, a universal adaptive output feedback control law is designed to globally regulate all the states of the system. A simulation example is presented to illustrate the effectiveness of the proposed design scheme.     

Genome-wide development of polymorphic microsatellite markers and their application in peanut breeding program

BackgroundCultivated peanut (Arachis hypogaea. L) represents one of the most important oil crops in the world. Although much effort has been expended to characterize microsatellites or Simple Sequence Repeats (SSRs) in peanut, the quantity and quality of the markers in breeding applications remain limited. Here, genome-wide SSR characterization and marker development were performed using the recently assembled genome of the cultivar Tifrunner.ResultsIn total, 512,900 microsatellites were identified from 2556.9-Mb genomic sequences. Based on the flanking sequences of the identified microsatellites, 7757 primer pairs (markers) were designed, and further evaluated in the assembled genomic sequences of the tetraploid Arachis cultivars, Tifrunner and Shitouqi, and the diploid ancestral species, A. duranensis and A. ipaensis. In silico PCR analysis showed that the SSR markers had high amplification efficiency and polymorphism in four Arachis genotypes. Notably, nearly 60% of these markers were single-locus SSRs in tetraploid Arachis species, indicating they are more specific in distinguishing the alleles of the A and B sub-genomes of peanut. In addition, two markers closely related with purple testa color and 27 markers near to FAD2 genes were identified, which could be used for breeding varieties with purple testa and high-oleic acid content, respectively. Moreover, the potential application of these SSR markers in tracking introgressions from Arachis wild relatives was discussed.ConclusionsThis study reported the development of genomic SSRs from assembled genomic sequences of the tetraploid Arachis Tifrunner, which will be useful for diversity analysis, genetic mapping and functional genomics studies in peanut.How to cite: Ma J, Zhao Y, Chen H, et al. Genome-wide development of polymorphic microsatellite markers and their application in peanut breeding program. Electron J Biotechnol 2020;44. https://doi.org/10.1016/j.ejbt.2020.01.004.     

我国南北方制造业工业设计应用现状对比分析

在对国内工业设计发展状况的资料调查中发现,南北方工业设计的发展不均衡,南方地区对工业设计应用的广度和深度明显优于北方;但北方制造业在对工业设计的认识上与南方制造业相当,大多数企业在接触工业设计的时间上甚至远远早于南方企业。本文对这种现状的形成及原因进行了探讨。