Results 31 to 40 of about 25,441 (211)
Preparation and Characterization of BN Coating on SiC Fibers by Carbothermal Reduction [PDF]
, 2016 本论文以硼酸三甲酯（trimethylborate—TMB）蒸气为硼源、NH3气为氮源，采用碳热还原氮化法在SiC纤维表面制备BN涂层。首先，SiC纤维与Cl2气反应表面生成碳化物衍生碳（carbide-derivedcarbon—CDC）层，然后，CDC层与TMB蒸气及NH3气在1300C发生碳热还原氮化反应，生成BN涂层。采用FT-IR、XPS、XRD、AES、SEM、TEM、电阻率测试、单丝拉伸试验等系统地研究了所得BN涂层的组成、结构和性能。研究发现 ...
袁梦娇
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Conservation Biology, EarlyView.Abstract Consumer demand for ivory perpetuates the unsustainable and illegal killing of African elephants and other wildlife species. Interventions that aim to change consumer behavior are increasingly recognized as a crucial element of demand management. However, poor design and implementation have limited their effectiveness.
Molly R. C. Brown +2 more
wiley +1 more source
, 2016 A geothermal well in Ganzi was chosen for the study. To provide a reference for the design and construc?tion of a geothermal plant, power generation techniques were selected and the thermodynamic process was calculat?ed based on cold and heat source ...
卜宪标 +3 more
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Informing spatial conservation prioritization with species’ traits
Conservation Biology, EarlyView.Abstract New Guinea, the most botanically diverse island on the planet, is the location for one of the boldest conservation initiatives. The Manokwari Declaration aims to achieve 70% conservation designation for the Bird's Head Peninsula. This is 40% higher than the 2022 Global Biodiversity Framework target.
Liam A. Trethowan +27 more
wiley +1 more source
Investigation of Microstructure, Mechanical Properties and Irradiation Behaviors of Nuclear Application Steels [PDF]
, 2015 在核能领域应用的关键材料的服役条件非常苛刻，需要在辐照、高温、腐蚀、受应力、热循环等极端条件下长期稳定工作，并按照可预期的方式老化、失效。堆内构件的性能与特性决定了核能可以达到的安全水平。中国从美国西屋公司引进、吸收与消化AP1000核电技术，以形成具有自主知识产权的核电技术，并在此过程中着重对一系列核能关键用材料进行了相关研发。本论文以国产SA-182F304钢、304SS钢、CNST1钢、CNST2钢和CNSS3钢为研究对象，对候选钢的微观结构、微观化学、力学行为和抗辐照性能进行了详细研究 ...
陈芙梁
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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
To cultivate students’ creative thinking and self-study ability by class discussion
Huli yanjiu, 2005 [目的]通过课堂讨论培养学生的自学创新思维能力。[方法]在护理本科专业《护理学基础》课程中开展课堂讨论教学,采用以学生为主体进行选题、讨论及效果评价等方法。[结果]通过课堂讨论,93 .6%的学生提高了检索、查阅能力,93 .6%的学生提高了自学能力,87.4%的学生提高了探究性思维的能力,92 .1%学生提高了分析归纳总结能力,84.2 %的学生提高了发现问题和解决问题的能力。[结论]课堂讨论教学方法能引导学生学会自学,激发学习兴趣,并促进其创新思维能力的培养。
姜今玉, 杨顺子
doaj
In-situ Raman Observations of PLZT Ferroelectric Ceramics under Stress Fields [PDF]
, 2015 在外场作用下铁电陶瓷材料的畴变会造成材料微结构的变形，最终会引发材料的性能退化、材料失效。因此了解铁电材料的破坏机理，研究外场作用下铁电材料的畴变规律，对提高铁电材料的使用价值具有指导性的意义。为探讨力场作用下铁电陶瓷的畴变规律，本论文开展了外力场作用下铁电陶瓷拉曼光谱变化的原位观测研究。论文工作包括：利用固相反应法合成了组成为Pb0.9La0.1(Zr0.52Ti0.48)0.975O3且晶粒尺寸（约5m）适于原位拉曼光谱观测的铁电多晶陶瓷；对合成出的PLZT铁电陶瓷进行化学组分 ...
梁丽苹
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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
Jianzhu Gangjiegou Jinzhan, 2017 经历不均匀热过程影响的对接焊接接头,呈现不均匀力学性能。在对对接焊接接头疲劳等分析过程中,应考虑不均匀力学性能。根据对接焊接接头分区和力学性能分布,提出了3种对接焊接接头不均匀力学性能分布模式:二区模式、五区模式和连续化模式。采用有限元方法分析材料力学性能不均匀模式对对接焊接结构性能分析的影响。采用3种模式结合已有试验数据,建立了不同精细化程度的有限元模型并进行有限元分析。研究结果表明:分布模式对结果会产生很大的影响,模式越精细,屈服荷载、极限荷载和屈服位移、极限位移就越小 ...
甘结良, 彭洋, 董军
doaj