共查询到20条相似文献，搜索用时 203 毫秒
1.
王武德 《黄石理工学院学报(人文社科版)》1988,(2)
本文在文献[2]的基础上,对有限元方程中系数矩阵[k]在采用变带宽一维压缩存贮时所需存贮量的估算展开了进一步的讨论,进而总结出了一种更经济、更实用、简便易行的新方法。 相似文献
2.
空间数据库的索引是提高空间数据库存储效率、空间检索性能的关键技术．在综述现有空间数据库索引技术的基础上，对比分析R树、R＋树和R^＊树索引，认为R^＊树索引可获得较高的结点存贮利用率，还可以避免结点的分裂．最后给出了R^＊树索引在VisualTopo软件中的应用实例． 相似文献
3.
廖湘萍 《株洲师范高等专科学校学报》2006,11(5):23-26,42
利用量子信息熵理论，研究耗散近似下Jaynes—Cummings模型中原子的熵压缩效应，结果表明：由于耗散的影响，原子压缩的幅度随时间减小，压缩效应随着时间减弱，耗散系数越大，压缩效应减弱越快；场强较大时，由耦合引起的耗散效应增强，压缩效应随时间减弱，当场强较小时可以忽略由环境引起的耗散效应． 相似文献
4.
李永平 《温州职业技术学院学报》2002,2(3):21-22,25
本文分析了VFP6．0图像数据的存贮及其处理，提出直接使用图像文件的图像数据管理办法，从而减少数据库的存贮容量，使系统运行更加稳定，备份和恢复图像数据更易于实现。 相似文献
5.
改性有机硅包裹钕铁硼粘结磁体的研究 总被引：2，自引：0，他引：2
研究在不同的包裹浓度下，改性有机硅对粘结钕铁硼磁体的磁性能及压缩强度的影响。通过改性，磁体的磁性能及密度提高，压缩强度随着改性物质含量增加显著提高；包裹剂的丙酮溶液浓度为4．0％wt时磁性能最好；包裹剂相对于磁粉的含量对磁体的磁性能无太大影响，但对压缩强度有明显影响。 相似文献
6.
现代信息技术对图书馆的影响 总被引：1，自引：0，他引：1
现代信息技术对图书馆的影响黎难秋１．现代信息技术与图书馆１．１．信息存贮技术存贮信息历来是图书馆的重要功能之一，累于信息“爆炸”，数十年来人们不断研究以新的信息介质（载体）来取代纸张。于是先后产生了各种缩微片带、声像磁盘、磁带，但并未根本上动摇纸张作... 相似文献
7.
运用初等数学建立存贮模型 总被引：1，自引：0，他引：1
工厂或商店存贮物品时要解决的问题，是如何使得存贮更合理。这种合理体现在满足需求的前提下，使得总的存贮费用达到最小。本文拟用初等数学方法建立最简单的存贮费用模型，以避免高等数学推导给学生带来的学习困难。在最简单的存贮费用模型中，假设需求是已知的，并且在单位时间内库存消耗量相等，进货能得到保证，那么存贮费用仅与订购费用和保管费用有关，而这两项费用直接与进货的批量有关。由此我们用Q表示批量，用S表示一次订购费，用I表示单位货物的年保管费，用n表示年进货次数，用R表示年总需求量。由于假定需求是连续的，均匀… 相似文献
8.
本文通过对SQL数据库服务器的存贮过程的介绍,并以Delphi开发工具为例描述了在网络数据库中使用存贮过程的方法,以提高数据库服务器资源,改善程序的性能,提高程序的运行效率。 相似文献
9.
多阶段EOQ存贮问题若干策略的比较 总被引：1，自引：0，他引：1
本文进一步研究了多阶段EOQ存贮问题的存贮策略，对四种存贮策略作了精神的比较分析，这四种策略是：Ⅰ．每阶段的按有限时域EOQ公式订货，并仅在库存为零的订货，在阶段转换时刻，以前一期的费用订货；Ⅱ．每阶段均按无限时域EOQ公式订货，在阶段末的库存不为零时，也要以前一期的较低费用补货；Ⅲ．与Ⅰ基本相同，但在阶段转换时刻，以后期的费用订货；Ⅳ．每阶段均按无限时域EOQ公式订货，并仅在库存为零时订货，逻辑推理的结果表明：（1）在确定性场合下，策略Ⅰ是其中的最优策略；（2）策略Ⅲ与策略Ⅰ在费用下降时等价的。但这并不说明策略Ⅱ，Ⅳ必须放弃，在费用变动不可预知的情况下，策略Ⅱ，Ⅳ仍是简单而适用的较优策略。 相似文献
10.
动态心电监护具有监测时间长、数据量大的特点,所以心电数据压缩十分必要．对于心电信号压缩的方法有很多,文章提出了心电信号小波变换自适应编码压缩方法,与其它压缩方法相比,此方法减少了信号重建时的失真,压缩比5到12． 相似文献
11.
吴卫华 《湖州师范学院学报》2006,28(5):97-100
在人们日渐依赖大众传媒的同时,权力因素正活跃于人与媒介无法回避的联系之中,这就是媒介的话语权。在各种媒介共存特别是网络媒体凸显作用的今天,电视媒体应在技术与内容方法上进行变革,以应对网络时代的挑战。 相似文献
12.
LORETTE K. WOOLSEY 《Counselor Education & Supervision》1986,26(2):84-94
A long-standing problem confronting counselor educators is the antagonism of counseling students toward research. In this article the author presents the thesis that a major source of the practitioner-researcher split is the conflict of values between the underlying assumptions of the traditional methods of research and theories of counseling. Scientific methods have often been narrowly interpreted in counseling. The emphasis in research has thus been on that which can be measured objectively, demonstrated by experiments, and replicated. Observation of natural events and people's own purposes frequently have been excluded. In contrast, humanist and existential theories of counseling focus on inner experience, qualitative, empathic understanding, and the importance of personal goals and purposes. Behind these disparate perspectives of research and practice are assumptions about the nature of reality, of knowledge, and of human nature. The result is a conflict of two value systems. Implications for counselor education are discussed and suggestions for resolving the conflict are presented. 相似文献
13.
陈德淑 《重庆大学学报(英文版)》2003,2(1)
~~When a bulletin is excited, the pressure ofatmosphere in the dynamic cavity is increased greatly and abruptly, which goes up to a range from 300 MPa to 350 MPa . With such a high pressure, the spacing block broke instantly. Therefore, the water in thestorage water chamber erupts abruptly, and the speed of the jet comes to 120 m/s. Of course, the formation of the jet is affected by some factors (such as the size and shape of the dynamic cavity, the gate limitationpressure of the spacing blo… 相似文献
14.
This paper presents a control strategy of a hybrid fuel cell/battery distributed generation （HDG） system in distribution systems. The overall structure of the HDG system is given, dynamic models for the solid oxide fuel cell （SOFC） power plant, battery bank and its power electronic interfacing are briefly described, and controller design methodologies for the power conditioning units and fuel cell to control the power flow from the hybrid power plant to the utility grid are presented. To distribute the power between the fuel cell power plant and the battery energy storage, a neuro-fuzzy controller has been developed. Also, for controlling the active and reactive power independently in distribution systems, the current control strategy based on two fuzzy logic controllers has been presented. A Matlab/Simulink simulation model is developed for the HDG system by combining the individual component models and their controllers. Simulation results show the overall system performance including load-following and power management of the HDG system. 相似文献
15.
Human performance technology has been successful in resolving organizational issues and prompting a variety of business improvements. Yet there are times when the problem‐ centered approach is not sufficient. Instead, attention to organizational strengths and a focus on creating and building a positive vision for the future represent a better strategy. This article looks at a new variation on the consulting model––HPT: Appreciative Approach. 相似文献
16.
中国共产党从建立以来一直致力于马克思主义中国化、时代化、大众化。解放战争时期,中国共产党在极其艰苦的条件下始终坚持马克思主义基本原理,不断与时俱进,继续推进马克思主义大众化,积累了丰富的经验,值得继承和借鉴。积累的经验主要有:加强党对舆论宣传和政治思想工作的领导,始终围绕党的中心工作和军事任务不断进行理论创新,为马克思主义大众化提供政治保证和理论前提;通过干部学校及在职学习、群众教育,以报刊图书、文学艺术、纪念活动等大众传媒为媒介,宣传和传播马克思主义及其中国化成果;同时关注民生,服务群众,为马克思主义大众化提供不竭源泉和动力。 相似文献
17.
A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the control and sensor system.An electric energy storage system (ESS) is required which possesses high power density with good cycle life.Ultracapacitors which exhibit high power density and cycle life are considered as energy storage devices.Simulations based on a specific voyage condition indicate that ESS with ultracapacitors has positive effects on reducing the output power demand of PEMFC and lightening the power system.Experimental results show that the state of charge (SOC) is related to the capacitance and resistance in ultracapacitor ESS. 相似文献
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复变函数的幂级数展开有多种方法,如变量代换法,分项分解法,幂级数乘法,待定系数法,逐项求积法,解微分方程法.将推广的高等代数理论融入复变函数是复变函数展成幂级数的一种新方法. 相似文献
20.
《International Journal of Educational Research》2002,37(6-7):567-586
As a result of Taiwan's peculiar political situation, national identity has become a crucial and controversial issue in the history curriculum. This chapter analyzes the changing role of nationalism in the history curriculum from 1980 onwards, focusing on the ways in which politics has affected the history curriculum. In particular, it examines how, why and to what extent the focus of the curriculum has shifted from China to Taiwan. Relying on analysis of the content of official syllabuses and textbooks for elementary and junior high schools, it concludes that Chinese identity was emphasized before the 1990s, while Taiwanese identity has been given greater emphasis more recently. The emergence of the identity issue has been part cause, part consequence of the democratization process and the shift of political power away from the KMT old-guard and towards more ‘nativist’ Taiwanese elements. 相似文献