Results 31 to 40 of about 25,807 (183)
Modification of radiation effect on cultured human cells [PDF]
, 1984 Thesis--University of Tsukuba, D.M.S.(A), no. 248, 1984.
Eguchi Kiyomi
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Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
Catalytic Activity of Ni/CeO2-ZrO2@SiO2Core-Shell Structure for Steam Reforming of Toluene [PDF]
, 2017 本文通过结构导向法制备一系列不同壳层厚度的Ni/Ce-ZrO2@SiO2催化剂，并将其应用到生物质焦油模型甲苯的蒸汽重整反应中。采用XRD、SEM、TEM和XPS等对催化剂的形貌及结构进行表征。结果显示，多孔SiO2层的存在能显著提高催化剂的性能，能通过修饰Ni的能带结构，改善Ni的本征活性并改变产物分布。SiO2壳层厚度对催化剂的性能也有影响，在一系列不同壳层厚度的Ni/Ce-ZrO2@SiO2催化剂中，壳–核质量比为0.5的催化剂表现出最高的催化活性，该催化剂在650℃和700 ...
张亮, 赵效勇, 闫常峰
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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
Dianci bileiqi, 1989 粘土莫来石化反应取决于所研讨的Al2O3的添加量、反应时间与反应温度.使用的粘土为含有一定量石英的高岭土.粘土莫来石化的动态分析证明,核晶模型成功地描述了1200℃～1300℃温度区间内的反应过程.试验测得这种反应的活化能在105～173kJ/mol范围内.添加5%Al2O3的粘土测得的活化能最低.添加浓度较高时粘土莫来石化过程的活化能试验值比不含添加剂时高.结果表明,采用Al2O3作为添加剂不仅能改善机械性能,而且对粘土莫来石化进程也起到影响.
庄子茹
doaj
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
Lignin and lignin-acetoderivative oxidative degradation into valuable aromatic aldehydes [PDF]
, 2015 本项工作研究了木质素的转化以及其副产品(乙酸基衍生物)转变为高附加值的芳香醛，乙酸基衍生物在碱性条件下催化氧化降解的动力学方程等问题。竹材木质素被转化为高附加值的芳香醛和乙酸基衍生物。在铜作为催化剂的条件下，香草乙酮被转化为香草醛。另外，乙酰丁香酮首次转化为丁香醛，从而通过降解木质素氧化过程中的副产物来提高整个过程的价值。本文用GC-MS分析得到了一种可靠的一致的相对影响因子法来定量木质素和乙酸衍生物。竹材木质素的总产率接近9.5%，且香草醛的产率为55%，其中90%以上来自于香草乙酮。来源于木质素 ...
KISSA RAJIF ALUNGA
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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
A combined theoretical and experimental study on higher alcohol synthesis over Alkali-promoted Cu/ZnO/Al2O3 catalysts [PDF]
, 2016 在合成气制备低碳混合醇（C2+OH）领域，一系列不同类型的催化剂相继被开发出来，但是C2+OH的工业生产仍旧面临着很大的困难与挑战。比如，对于目前所开发的催化剂，C2+OH的选择性较低、副产物过多，从而导致碳资源利用率太低等等。本文的研究目标是提高合成气转化过程的碳资源利用率，因此本工作不仅需要考虑产物中C2+OH的选择性，同时还要兼顾副产物（比如，低碳烷烃以及CO2等）的生成。 本文首先考察了反应温度、两种常用的碱金属助剂K2O以及Cs2O的用量 ...
孙杰
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Advancing conservation breeding programs for marine invertebrates
Conservation Biology, EarlyView.Abstract In the face of ecosystem change and biodiversity loss caused by climate change and other stressors, conservation breeding, or captive breeding, with the aim of reintroduction for wild population recovery, is an emerging tool for preventing species’ extinction and rehabilitating ecosystems.
Elora H. López‐Nandam +3 more
wiley +1 more source