Results 101 to 110 of about 980,523 (241)
, 2004 以GCr15钢为实验材料进行旋转弯曲超高周疲劳行为的实验研究。用光学显微镜和扫描电镜对试样疲劳断口进行观察 ,结果显示 ,疲劳断裂周次从 10 6 直到 4× 10 8,GCr15钢疲劳裂纹大多起源于试样内部 ,裂纹源一般为非金属夹杂物。从内部起裂的试样 ,疲劳寿命一般比从表面起裂试样的寿命长。文中从断裂力学和断裂物理的角度 ...
周承恩, 洪友士
core
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
野生动物学报, 2017 2015年3～5月,采用焦点动物取样法和瞬时扫描法,对四川邛海湿地小鸊春季行为进行实地观察研究。根据观察结果编制小鸊行为谱,将其行为分为觅食、理羽、游泳、潜水、飞行、警戒、鸣叫、嬉戏、争斗、护幼、休息、其他等12类。研究结果表明,在行为时间分配上,小鸊春季主要时间用于游泳(24.28%),其次为警戒(15.00%)、理羽(11.94%)、鸣叫(9.87%)、觅食(9.77%)、休息(6.49%)等。觅食行为在晨昏出现2个高峰期; 警戒行为和休息行为的节律基本一致; 潜水行为无明显的节律性变化 ...
张 萍 亓东明
doaj
, 1995 Ａ型行为（ＴＡＢＰ）从被提出到８０年代期间，一直被认为是一种易患冠心病（ＣＨＤ）的行为模式。这种观点得到了许多研究的支持。然而８０年代以来，反对此观点的研究不断出现，由此在ＴＡＢＰ与ＣＨＤ是否相关的问题上引起很大争论。通过回顾前人文献可以看出，对ＴＡＢＰ成分的认识不一致、缺乏对核心本质的认识及测量方法的差异是造成矛盾结果的主要原因。本文对这些原因进行了分析，并综述了近几年研究者对ＴＡＢＰ的新的认识和研究思路，即不再把ＴＡＢＰ当成一个整体来研究，而是转向于其内部的具体行为特点及其所形成的维度 ...
谢东
core
Modeling seed germination data to meet biodiversity conservation needs in the Mediterranean
Conservation Biology, EarlyView.Workflow to assess the availability and quality of germination data and assign species' thermal risk in the Mediterranean. (a) Assessment of data availability, including the phylogenetic distribution of the number of records (i.e. available germination data); (b) data quality assessment; and (c) assignment of climate risk categories for species that ...
Diana María Cruz‐Tejada +2 more
wiley +1 more source
野生动物学报, 2006 扬子鳄性喜静,给人的感觉总是趴在地上匍匐不动或仅露出头部漂在水中,但如果你有机会走进扬子鳄的世界,你就会发现,其实扬子鳄的行为世界是丰富多彩的。根据观察结果, 笔者认为扬子鳄的行为应主要包括: 休息行为（水中休息、陆地休息、晒太阳、挠痒、打哈欠、伸懒腰）;运动行为（游泳、潜水、爬行、摆尾）;摄食行为（摄食、漱口）;冲突行为（打斗、对视）;嬉戏行为（嬉戏、堆积）; 吼叫行为、排泄行为等。
张方, 吴孝兵
doaj
Exploring legal‐ and health‐risk messaging to reduce demand for elephant skin
Conservation Biology, EarlyView.Abstract Asian elephants (Elephas maximus) are poached for an illegal trade in their skins, which are used in traditional medicine in Africa and Asia. We explored whether messages about the legal and health risks of using elephant skin for medicinal purposes (stomach illness) could reduce such consumption.
Beilu Duan +10 more
wiley +1 more source