Results 101 to 110 of about 253,021 (198)
Differences in characteristics between naturalized threatened plants and other threatened plants
Conservation Biology, EarlyView.Abstract Many non‐native plant species introduced by humans have become naturalized. At the same time many species are threatened in their native range. However, the number of plant species threatened in their native range that are naturalized elsewhere remains unknown.
Weihan Zhao +10 more
wiley +1 more source
Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source
Studying Distributed Simulation Technology Based on HLA [PDF]
, 2005 分布交互仿真满足了仿真灵活性的要求，为复杂系统的仿真提供了可能。研究分布交互仿真技术，开发具有实用价值的分布交互仿真系统，在军事上是实现多武器平台在作战环境下进行体系对抗仿真的关键。建立一个合成的分布式虚拟环境可为工程技术人员提供对武器性能在作战环境下进行在线评估的手段，为指挥人员、作战人员提供一个验证作战想定、进行作战演练的环境。采用分布仿真技术构造逼真的虚拟战场和虚拟武器平台，并在其中进行仿真演练已成为减少国防开支、保持军事优势、提高作战效能、降低战时损失的重要手段。HLA是一个通用的仿真技术框架 ...
吕豪强
core
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
Gaoya dianqi, 2015 为研究油纸套管的寿命分布以及发生层间击穿后的剩余寿命,结合绝缘材料寿命的威布尔分布理论,建立了套管绝缘层寿命模型。并利用蒙特卡罗方法仿真计算了某型号110 k V油纸套管的寿命分布以及发生层间击穿后的剩余寿命分布。研究表明,该型号油纸套管的寿命符合形状参数为19.68,尺度参数为22.05的威布尔分布。当发生一层和两层击穿之后,形状参数分别减小为5.47和0.22,这意味着发生层间击穿之后由于电场分布的改变使得套管的寿命会迅速减小,层间击穿对于套管内绝缘是一个自加速过程 ...
杨贤 +5 more
doaj
集団の代表値としての、尖度･歪度の活用 : 児童の身長の分布を例として [PDF]
, 2013 集団の特徴を観察するために、平均値や標準偏差などの指標が用いられている。しかし、集団の分布はこれらの指標だけでは十分ではない。本報告では、子どもたちの体格の分布について、分布の尖り具合と歪み具合を示す尖度と歪度を用いて、その推移を観察した。その結果、分布の推移は近年あまり大きな変化を観察されなかったが、歪度において、男子では正の値を、女子では負の値を示し、男女間で違いがあることが示された。これは小学高学年で見られる男女の発育のスパート時期の違いによりもたらされたと解された ...
佐藤 洋, 黒川 修行
core
Geographic risks to functional groups of mammals and birds from habitat loss in Mexico
Conservation Biology, EarlyView.Abstract There is a need to quantify the impact of habitat loss due to anthropogenic factors on different aspects of biodiversity, such as functional trait diversity represented by functional groups (FGs). We developed a metric to assess the weighted risk of loss of habitat for 33 FGs of mammals and 36 FGs of birds in Mexico based on potential ...
Fernando Mayani‐Parás +4 more
wiley +1 more source
Guangtongxin yanjiu, 2003 对多段保偏光纤 （PMF）组成的光纤链路的偏振模色散 （PMD）统计特性进行了数值仿真 ,分析比较了光纤段的长度、段数和级联角度不同的条件下 ,链路的群时延差 （DGD）分布特性 .仿真结果表明 ,在相同的条件下 ,级联的 PMF段数越多 ,仿真得到的 DGD分布就越趋向麦克斯维分布 ;随机变化的物理量越多 ,使 ...
沈晓强, 邵钟浩, 于娟
doaj
Value Creation and Profit Allocation in the Distributed Innovation [PDF]
, 2015 分布式创新联盟的形成过程及机制不同于集中创新。分布式创新过程中，主体的异质性和结构的复杂性使得分布式创新的价值形成和利益分配是联盟无法回避的关键问题。本论文从不同视角、针对性地采用不同的方法，研究分布式创新过程中的价值形成和利益分配问题。 在分布式创新价值形成研究中，首先，从知识管理角度，采用计算实验方法建立多种相关知识在多种创新合作网络变化策略下的知识积累模型，研究知识关联度和网络变化策略对知识积累的影响，研究结果表明在主体资源有限的情况下，对于拥有相同知识主体采用网络均衡策略 ...
张薇
core
Harnessing social media data to track species range shifts
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury +15 more
wiley +1 more source