Results 21 to 30 of about 11,536 (165)
Evaluating synthetic substitutes to reduce illegal harvesting and support species recovery
Conservation Biology, EarlyView.Abstract Providing synthetic substitutes is a widely promoted strategy to shift consumer demand away from wildlife products derived from threatened species. Yet, there is little evidence on whether product substitution prevents illegal or unsustainable harvesting and contributes to the recovery of threatened populations.
Aditya Shekhar Malgaonkar +17 more
wiley +1 more source
, 1994 介绍了对高速球形弹丸撞击金属厚靶的开坑现象所进行的实验研究。最高弹速为7.5km/s；弹靶材料有7种组合：硬铝打硬铝;钢打钢;黄铜打黄铜;钢打硬铝;硬铝打钢;钢打纯铜和硬铝打铅。用量纲分析归纳前6种（即铅靶除外）情况;得到坑深P和弹径D。之比值的经验关系是其中v是弹速;Pp和Pt是弹和靶的材料密度;Yt是靶板材料的动态屈服强度。铅靶因为容易产生熔化和气化;且可压缩性好;故坑深实验值比上式的计算值高得多。对于一定的弹靶材料的组合 ...
孙庚辰 +3 more
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Policy Studies Journal, EarlyView.ABSTRACT What are the conditions under which business corporations expand their institutional power? This paper argues that institutional power is affected by the architecture of the “acquisition regime”—the set of formal (and informal) rules that govern how states purchase public services.
Reut Marciano, Shir Gal
wiley +1 more source
People and Nature, Volume 8, Issue 3, Page 741-753, March 2026.Abstract Currently, scholarship on education to foster connectedness with nature primarily focuses on children. As adults likewise face the disconnection from nature and play a key role in influencing children, it is important to understand how they perceive, engage in, and benefit from relevant programmes.
Xiaoxue Chen, Zuyi Lyu, Junxi Qian
wiley +1 more source
Realization mechanism and performance of room-temperature gas sensors [PDF]
, 2016 降低工作温度对于提高气体传感器的安全性，增加便携式或可穿戴设备的续航时间和组建高可靠性的无线传感网络有至关重要的作用。然而对于金属氧化物气体传感器来说，工作温度的降低并不是一件简单的事情。任何定量检测的本质都是事先构建一个可量化的不稳定平衡，然后让待测物打破这个平衡来获得响应。把传感器看作一个封闭系统，工作温度的降低意味着系统稳定性的增强，以至于在较低的温度下电流（或电压）平衡难以被痕量待测气体的出现所打破。近年来有研究表明借助紫外光活化可以显著地降低气体传感器的工作温度，甚至实现了对多种气体的室温检测，
刘彬
core
Zonal prediction of the heights of water-conducting fracture zones under varying overburden types in North China-type coalfields [PDF]
BackgroundThe gradual increase in the exploitation depth and intensity of coal resources in the North China-type coalfields has caused problems such as overburden movement and damage, as well as fracture evolution.
Dongjing XU +6 more
core +1 more source
Experimental Investigation on Viscosity of Latent Heat Nanofluids [PDF]
, 2011 TiO2-BaCl2-H2O is a kind of new latent heat nanofluids which can be used for phase change cool storage.The influences of volume fraction of TiO2 nanoparticles and temperature on the viscosity of latent heat nanofluids TiO2-BaCl2-H2O are measured.The ...
core +1 more source
Factors That Influenced Coping With COVID‐19 During the Pandemic in Botswana
World Medical &Health Policy, Volume 18, Issue 1, March 2026.ABSTRACT This paper forms part of the broader Global South study, Personal and Family Coping with COVID‐19 in the Global South, which examines psychosocial and behavioral responses to the COVID‐19 pandemic. In Sub‐Saharan Africa, the pandemic posed significant psychological, social, and economic challenges, with important implications for preparedness ...
Magen Mhaka‐Mutepfa +3 more
wiley +1 more source
Study on controllable growth and surface doping of large area CVD graphene [PDF]
, 2015 对石墨烯进行一定程度的改性是开发和实现其应用不可或缺的步骤。化学方法可能是最好的方法之一，目前，基于化学改性的石墨烯开发的触摸屏、超级电容、光电器件等应用已经取得了巨大的突破，越来越多的人们开始尝试通过化学的方法改善石墨烯的某一处或几处不完美之处，探索石墨烯在更多领域的应用。在实现其广泛应用的道路上，高质量石墨烯的可控制备同样是一个急需解决的问题。 本文在铜基CVD法石墨烯制备技术基础上，利用同位素标定及Raman、SEM等表征技术，在石墨烯生长机理 ...
黄志艺
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Latin American Policy, Volume 17, Issue 1, March 2026.ABSTRACT The rise of ride‐hailing platforms has profoundly transformed urban mobility in Latin America over the past decade. Transportation Network Companies such as Uber, DiDi, Cabify, InDrive, and others operating in the region have affected transportation patterns and intensified debates around labor relations, algorithmic management, regulatory ...
Ronald Sáenz‐Leandro
wiley +1 more source