关于粘性导数的几个性质的探讨     

汪元伦 《绵阳师范学院学报》2004,23(2):19-21

M .G .Crandall等人在文 [1]中给出了函数的粘性导数的概念。在这个概念的基础上我们讨论了函数的粘性导数的上 (下 )导集的几个性质 :在函数可微点处的性质、闭凸性质、与C1类函数的和的性质、与C2 类函数的差在严格局部极大 (小 )值点的性质。  相似文献   

拒绝服务攻击原理与防御策略   总被引：3，自引：0，他引：3  

夏尊背 《通化师范学院学报》2004,25(2):22-25

介绍了拒绝服务攻击实施的原理，以及相关协议的漏洞和拒绝服务攻击的最新进展，并说明了如何结合防火墙和入侵检测系统等手段来防范其攻击。  相似文献   

论21世纪图书馆的发展模式与功能   总被引：3，自引：0，他引：3  

尹章池 《鄂州大学学报》2001,8(1):75-76

本文分析了影响决定图书馆发展模式的四个重要因素。即技术、资金、文化心态和制度变迁。认为模式的不同导致图书馆功能在不同时代的差异，并提出了21世纪图书馆的四种发展模式，阐述了它们的主要功能。  相似文献   

Physical design method of MPSoC     

LIU Peng XIA Bing-jie TENG Zhao-wei 《浙江大学学报(A卷英文版)》2007,8(4):631-637

Floorplan, clock network and power plan are crucial steps in deep sub-micron system-on-chip design. A novel di- agonal floorplan is integrated to enhance the data sharing between different cores in system-on-chip. Custom clock network con- taining hand-adjusted buffers and variable routing rules is constructed to realize balanced synchronization. Effective power plan considering both IR drop and electromigration achieves high utilization and maintains power integrity in our MediaSoC. Using such methods, deep sub-micron design challenges are managed under a fast prototyping methodology, which greatly shortens the design cycle.  相似文献   

长光程薄层光谱电化学技术及应用     

郁章玉  张为超  翟翠萍  汪汉卿 《实验室研究与探索》2003,22(6):40-44

提供电子转移反应实验研究的实验装置及技术，依此可获得电子转移数、式电极电势、式异相电子转移速率常数、电子传递系数及还原态和氧化态的扩散系数等一系列重要的电化学参数。还可依此为基础设计出新颖、实用的教学实验。  相似文献   

If条件分句中will的语用功能     

张尚信 《湖南科技学院学报》2002,23(1):64-65

对if-条件分句中的will的语用功能进行了探讨.  相似文献   

课程改革中教师关注阶段理论的研究述评   总被引：4，自引：0，他引：4  

尹弘飚 《比较教育研究》2004,25(8):38-43

本文介绍了"关注阶段"的理论架构与评定方法,回顾并分析了它在美国、比利时、荷兰、香港以及澳大利亚等文化情境中的运用与发展.在我国新课程改革背景下进行关注阶段研究不仅有利于我们了解新课程实施情况,而且有助于这一理论自身的发展.  相似文献   

VaR模型在我国养老基金投资风险控制中的应用     

林源 《怀化学院学报》2006,25(1):68-70

养老基金的投资面临多种风险,要实现其保值增值,必须进行风险度量和监控。VaR模型作为一种新的金融风险管理工具,因其有别于传统的金融风险管理工具的特点,在西方受到广泛青睐。探讨该模型在我国养老基金投资风险控制中的应用。  相似文献   

A four spiral slots microstrip patch antenna for radiotelemetry capsules based on FDTD     

HUANG Biao YAN Guo-zheng LI Qian-ru 《浙江大学学报(A卷英文版)》2007,8(10):1560-1567

Antenna is very crucial to radiotelemetry capsules which can measure the physiological parameters of the gastroin- testinal (GI) tract. The objective of this paper is to design a novel spiral slots microstrip patch antenna for the radiotelemetry capsules communicating with external recorder at 915 MHz located in ISM (Industry, Science, and Medical) bands. The microstrip patch antenna is designed and evaluated using the finite-difference time-domain (FDTD) method. Return loss characteristics and the effect of the human body on resonant frequency are analyzed, and the performances of radiation patterns at different positions of the human alimentary tract are also estimated. Finally, specific absorption rate (SAR) computations are performed, and the peak 1-g and 10-g SAR values are calculated. According to the peak SAR values, the maximum delivered power for the designed antenna was found so that the SAR values of the antenna satisfy the ANSI (American National Standards Institute) limitations.  相似文献   

Sex Education Legislation and HPV Vaccination Rates among Adolescents in the United States     

Sarah Fagan  Lisa Gallicchio 《American journal of sexuality education》2020,15(2):246-261

Abstract

This study sought to determine if human papillomavirus (HPV) vaccination rates are associated with teaching requirements for abstinence in state sex education laws and policies. A cross-sectional analysis was conducted assessing the association between abstinence education legislation and HPV vaccination rates in adolescents (aged 13–17?years). After adjustment for insurance coverage and household income, the level of abstinence education was not significantly associated with vaccination rates. However, a higher percentage of individuals uninsured was significantly and negatively associated with the vaccination rate. This suggests that HPV vaccination rates are associated with insurance coverage, but not with the degree to which sex education laws or policies emphasize abstinence.  相似文献