Results 41 to 50 of about 24,422 (178)
Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Guangtongxin yanjiu, 2007 文章中设计的四象限InGaAs雪崩光电二极管（Avalanche Photo Diode,APD）的管芯结构采用正入光式平面型结构,而材料结构采用吸收区、倍增区渐变分离的APD结构,在对响应时间、暗电流和响应度等参数进行计算与分析的基础上,优化了器件结构参数。试验结果表明,其响应时间≤1.5 ns,响应度≥9.5 A/W,暗电流≤40 nA,可靠性设计时使PN结和倍增层均在器件表面以下,可有效抑制器件表面漏电流,提高器件的可靠性。
王致远, 李发明, 刘方楠
doaj
Product Development Process Reengineering of Company C Based on Agile Software Development Principles [PDF]
, 2016 近年来随着移动网络的快速发展，智能移动端终端如手机和平板等迅速扩大了其占有率。在此背景下，一方面无数移动互联网公司迅速崛起，而与此同时在互联网起步的90年代创业的互联网公司却日益在快速变化的市场环境中败下阵来。本文以一家主营业务为美国保险产品在线销售的C公司为研究对象。其以敏捷开发为方向，并以流程再造相关的工具及方法对C公司的开发流程进行了卓有成效的改造。 在流程再造过程中，通过价值流程图的前置时间、处理时间及准确完成率三项指标对当前开发流程存在的问题进行了量化分析。在实施准备过程中，敏捷实践选型 ...
邓晓辉
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Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, EarlyView.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
wiley +1 more source
Design and Implementation of Student and Performance Management System [PDF]
, 2015 随着我校专业学生规模的日益扩大，学籍、课程、成绩等数据量急剧上升，采用传统的手工管理方式，不仅需要付出极大的人力、物力和财力，而且管理难度增大、效率低、容易出错。因此，有必要立足我校学籍成绩管理现状，建立适合我校现状和发展的学籍成绩管理系统，实现学籍成绩信息的管理、共享及有效利用，同时，使用数据仓库技术，在已有的学籍成绩数据基础上，构建面向分析的数据环境，快速、互动地从多个角度、多种数据综合程度分析与评价数据，提升我校教务管理水平和效率。 本文以学籍成绩管理系统设计与实现及数据仓库技术在其中的应用为内容。
袁建波
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Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
wiley +1 more source
Jixie chuandong, 2005 换档性能是湿式摩擦片离合器的诸多重要特性之一。换档转矩是离合器的一个重要的特征值。相对应于各种摩擦面组合,滑动速度、比压、温度等参数均影响换档转矩-时间曲线。设计离合器时应注意这几个参数应不超过本文中所列的极限值;对不同的摩擦面制造方式,摩擦面的松开时间不同,对转矩的影响也不同;离合器加压的时间进程快慢,摩擦面的数目多少,冷却油粘度大小,均不同程度影响了换挡品质;油中不同添加剂对摩擦性能会产生不同影响;油温太高,油的老化均会对换档性能产生不利影响。根据离合器的应用工况,合理确定各个参数,可使换挡性能最佳。
李科花, 周卜生
doaj
Hybrid data synchronization mechanism for mobile computing [PDF]
, 2016 The hybrid data synchronization mechanism (HDSM) was proposed,which integrates centralized architecture and ad hoc architecture together,and a series of self-organization domains (SOD) were built as to cut down the traffic of synchronization data and ...
Xiao-long XU, Xiao-xiao LIU
core +1 more source
Regulatory compliance and support for altered management of the exotic pet trade
Conservation Biology, EarlyView.Abstract Globally, the exotic pet trade has contributed to species invasion, disease, and animal welfare risks. Although scientists have advocated for increased trade regulation, the success of management and regulatory efforts depends on compliance by participants in the exotic pet trade. We used a regulatory compliance framework to investigate exotic
Elizabeth N. Pratt +3 more
wiley +1 more source
Dianci bileiqi, 2001 探讨了氮化铝 （Al N）粉末合成过程中 ,Al N粉末纯度和粒径与反应温度、反应时间、氮气气氛、活性碳、Al N晶体之间的关系 ,以及 Al N中 O的存在原因。结果表明 :反应温度对 Al N粉末纯度的影响远大于反应时间对其的影响 ;碳的活性直接关系到 Al N粉末的纯度和粒径 ;Al N晶种引入有助于降低反应活化能、细化晶格 ;Al N中 O来源于脱 C过程中形成的微晶态 Al2 O3。上述诸多因素对高纯超细 Al N粉末的合成起着重要的作用与影响。
顾向民, 贾东旭
doaj