Results 11 to 20 of about 24,580 (164)
Study on Influences of Subway Construction on Neighboring Surface and Buildings [PDF]
, 2016 近年来，我国城市化进程加快，城市地铁建设发展迅猛，为缓解城市交通拥堵发挥了重要作用。然而，地铁大多位于城市繁华地区，地面建筑物林立，施工对周边建筑物所产生影响也表现得越来越突出。本文以厦门市轨道交通1号线工程为背景，在对实测变形监测资料详细分析的基础之上，研究了地铁施工引发周边建筑地基及地表变形的预测方法，总结了地铁施工引发周边建筑地基变形的影响因素与规律，提出了适用于厦门地区地铁施工对周边建筑物影响的控制指标及安全评估方法。主要研究内容及成果如下： （1）根据实测数据统计 ...
张佳
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A link between increased temperature and avian body condition in a logged tropical forest
Conservation Biology, EarlyView.Abstract The combined effects of anthropogenic disturbances, such as logging and climate change, remain poorly understood; yet, they are the main threats to tropical biodiversity. Most tropical African countries lack long‐term climate data, so climate impacts on biodiversity cannot be assessed.
Moreen Uwimbabazi +7 more
wiley +1 more source
Nonlinear finite element analysis for seismic performance of high-strength concrete beam-column joints with new reinforcement details [PDF]
, 2006 Because the factors that affect the behavior of the beam-column joints are complicated, an experimental study alone is not sufficient. Therefore, a nonlinear finite element analysis was conducted to provide better understanding of the performance of the ...
Gan, L, Li, J, Pam, HJ
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How much biotic nativeness matters across human demographic groups
Conservation Biology, EarlyView.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source
, 1982 本文给出钝头细长锥无粘、平衡和非平衡高超声速绕流流场的数值分析。对存在化学反应的空气,考虑了13种气体组分和22个化学反应,包括N_2、O_2和NO的振动松弛与离介过程之间的耦合反应。头部亚-跨声速区和后身高超声速区分别用直线法和有限差分法进行计算。在来流条件M_∞=20～26,Re_∞=(p_∞u_∞α)/μ_∞=1.5×10~3～5.5×10~6(α为头部半径)的参数范围内,给出了绕流流场和等离子体鞘层诸特性,如激波形状 ...
周正瑾, 马文驹, 高智
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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
Jump risk and bid-ask spread under different strike price [PDF]
, 2016 期权的买卖价差和风险溢价问题一直是一个热点的话题，尽管有很多文章做了相关的研究，但是目前国内外均没有从跳跃风险的角度来研究期权市场的买卖价差问题。本文主要研究了在非完全市场下，期权的行权价格对于期权做市商买卖价差的影响。首先，本文先回顾了Amin（1993）的模型，即在跳跃风险的方差可以分散的情况下，可以得到市场均衡的唯一买卖价格，这比布莱克-斯科尔斯模型中得到的均衡价格要大。然后，本文假设跳跃风险的方差是不可分散的，通过均衡市场的理论推导出静态对冲和动态对冲两种情况下，期权做市商最大化效用的买卖价差 ...
朱丛骁
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Conservation Biology, EarlyView.Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis +7 more
wiley +1 more source
The Extension of Dual-channel Supply Chain Model Based on Strategic Customer WTP [PDF]
, 2016 电子商务和物流业的快速发展增加了顾客购物的便利性，很多制造商会在传统零售渠道的基础上，增加电子渠道来迎合顾客购物足不出户的愿望，节约了顾客的时间，大大提高了交易的效率，比如苹果、三星、海尔、联想等都采用传统渠道与电子渠道相结合的销售方式。电子渠道不仅吸引了制造商，也吸引了传统零售商，从而形成产品多渠道销售的模式。同时顾客也在多渠道中权衡利弊，做出最有利于自身的购买选择。本论文以双渠道供应链的战略顾客选择模型为基础，分别在顾客类型、销售时期、产品类型、销售渠道四个方面进行扩展，综合应用顾客剩余效用分析法 ...
赵洋
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Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source