Results 41 to 50 of about 12,931 (165)

不同配置农田防护林对田间土壤水分空间变异的影响

open access: yesShuitu Baochi Xuebao, 2020
河套灌区是我国最大的引黄灌区,区内水资源匮乏,农田防护林系统在灌区土壤水分调控中发挥着重要作用。为明确防护林对农田土壤水分的影响,采用传统统计学方法综合分析了防护林网内土壤蒸发、风速、光照强度、气温、空气相对湿度、细根生物量密度及土壤容重等因素对土壤含水量的影响。结果表明:不同配置的农田防护林网内田间土壤水分具有明显的空间异质性,水平方向上土壤含水量与林带距离呈正向关系,主要影响因子为风速、土壤蒸发和1H(H为防护林树高)范围内的细根生物量密度;垂直方向上0—80 cm土壤水分从表层向下逐渐增加 ...
王栋   +4 more
doaj  

Analysis and Design of Access Control System for an Office Network [PDF]

open access: yes, 2015
计算机互联网技术的迅速发展给人们的日常工作和生活带来了极大便利。但是在计算机互联网技术的发展过程中,网络信息安全问题已经成为了不可避免的难关。在计算机网络环境下,黑客、病毒、木马等各种安全威胁都是利用应用软件和操作系统中的相关漏洞来攻击计算机网络中的接入主机终端,并且迅速地在网络中进行传播。 针对目前这种网络安全的现状,本文应用802.1X的认证技术与网关认证实施联动,设计并实现了一套办公网络的安全准入控制系统。在本文实现的安全准入控制系统中,接入控制系统应用802.1X技术来实现 ...
陈爱章
core  

Holding dysregulation in mind: How maternal mind‐mindedness relates to regulatory symptoms and disorders in infancy

open access: yesInfant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 6, Page 855-869, November 2025.
Abstract This study examined the role of maternal mind‐mindedness (MM) – the tendency to ascribe mental states to one's child – in infant regulatory symptoms and disorders and the moderating role of parenting stress and global psychological distress. A better understanding of these relationships may inform prevention and intervention programs.
Anna Katharina Georg   +4 more
wiley   +1 more source

微电子设备的防雷及过电压保护

open access: yesDianci bileiqi, 2003
电压瞬变和浪涌将导致微电子设备的损坏,微电子设备的防护问题已经得到越来越多的重视。防护过电压常采用均压、分流、屏蔽、接地和保护等措施,介绍了防护器件的种类及特性并指出各自的优缺点,还介绍了微电子设备过电压保护的多级防护。
千涛
doaj  

Japan's Economic Security: Policy Development Under the Influence of Security Identity and Key Players' Policy Initiatives

open access: yesPolitics &Policy, Volume 53, Issue 5, October 2025.
ABSTRACT The intensifying technological confrontation between the United States and China has compelled Japan to implement policies and measures to safeguard supply chain networks and sensitive technologies. This article analyzes the development of Japan's economic security strategy with a focus on domestic policymaking, aiming to identify its key ...
Hidetaka Yoshimatsu
wiley   +1 more source

Precaution of nurses in basic level hospitals on occupational exposure to HIV

open access: yesHuli yanjiu, 2004
[目的 ]做好人类免疫缺陷病毒 (HIV)职业暴露的防范 ,防止基层医院护士HIV院内感染。 [方法 ]组织护士学习 ,加强对HIV职业暴露的认识 ,辨别临床病例对护士HIV职业暴露的危险性 ,落实各项防范措施。 [结果 ]护士未出现HIV院内感染。 [结论 ]加强对护士的培训 ,提高护士对HIV职业暴露防范的认识 ,加强院内感染控制的管理 ...
陈晶华, 赖美燕
doaj  

Design and Implementation of Network Monitoring System based on Rule Database [PDF]

open access: yes, 1900
随着互联网技术的不断发展,网络安全问题在现代社会中不断凸显,从最初的简单口令猜测等到现在的漏洞扫描、缓冲区溢出等,到后来的通过伪造IP截取网络包等,网络攻击也处在不断发展的进程中。现如今,网络安全问题是不容忽视的,个人的财产或国家的经济发展、安全保障都可能因为网络中的不安全因素而受到巨大的影响,所以网络安全问题是互联网发展中不可回避、不可小觑的问题。 本文从网络监控中比较完善的入侵检测系统入手,分析其原理和体系结构,实现一个Linux下网络监控系统。在具体实现方面,主要采用对网络中的数据进行协议分析 ...
赵益民
core  

Recommendations for dealing with waste contaminated with Ebola virus: a Hazard Analysis of Critical Control Points approach [PDF]

open access: yes, 2016
Objective To assess, within communities experiencing Ebola virus outbreaks, the risks associated with the disposal of human waste and to generate recommendations for mitigating such risks.
Ahmed A Mohamedani   +25 more
core   +2 more sources

An Analytical Model of Particle Impact Rate in Partially Dense Inclined Granular Flow Driven by Gravity

open access: yesEarth and Space Science, Volume 12, Issue 8, August 2025.
Abstract High‐frequency seismic waves are generated by inter‐particle collisions during granular flows travel downslope. However, the accurate estimation of particle impact rates over granular layers remains a challenging issue. Here, controlled laboratory experiments were performed to investigate basal dynamic pressures triggered by the impact of ...
Zheng Chen   +4 more
wiley   +1 more source

库布齐沙漠典型防护林土壤养分特征

open access: yesShuitu Baochi Xuebao, 2022
以库布齐沙漠典型防护林为研究对象, 通过测定不同防护林的土壤理化性状, 评估该防护林系统的土壤改良效益, 为库布齐沙漠防护林的管理与养护提供理论依据。结果表明: (1)库布齐沙漠防护林营建15年后, 在植被改良的作用下, 原有的流沙质量发生了明显改变。与流沙环境相比, 研究区土壤的碱解氮(AN)、速效磷(AP)、速效钾(AK)、有机质(SOM)、全氮(TN)、全磷(TP)、全钾(TK)含量分别提高了243.95%, 37.89%, 108.84%, 138.71%, 118.77%, 42.41 ...
王涛   +6 more
doaj  

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