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四川大学学报. 自然科学版, 1998 广义模糊度量空间中映象的不动点定理陈琼（数学系）引入一类广义ｆｕｚｙ度量空间，其ｆｕｚｚｙ度量是一个满足一定条件的模糊数，刻画的是两个模糊点之间的距离．还研究了广义ｆｕｚｚｙ度量空间中映象不动点的存在性，得到了一些不动模糊点定理．１基本概念和引理称映...
陈琼
doaj
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
, 2014 非线性方程求根的问题可转化为求不动点的问题,后者常采用迭代法求解.不动点存在唯一性判定定理是其重要定理.通常的不动点存在唯一性判定定理基于Banach不动点定理,需要判定迭代函数是否具备两个条件:映内条件和压缩条件.指出对于非线性方程求根的问题,映内条件可用边界条件代替,并提出改进的不动点存在唯一性判定定理.改进的定理用边界条件取代了映内条件,从而不必考虑迭代函数在整个区间上的情形,而仅需考虑其在区间边界上的函数值,因此更便于应用,且适用范围更广.福建省自然科学基金 ...
晁飞, 施明辉, 周昌乐, 江敏
core
, 2002 本文发展了不可压流动摄动有限差分(PFD)格式,分别对不可压缩二维方腔流动、后台阶和前台阶流动进行了数值模拟。并把PFD格式的数值结果和一阶迎风、二阶迎风、三阶紧致格式以及SOLA方法的数值结果进行了比较,结果表明摄动有限差分(PFD ...
高智, 张德良, 朱力立
core +2 more sources
Conservation Biology, EarlyView.Abstract Reversing ongoing biodiversity loss requires effectively managing anthropogenic threats. Although conservation actions can mitigate these threats, prioritizing and targeting such actions remain challenging because species respond differently depending on the nature of the threats and their biological traits.
Camila Guerrero‐Pineda +3 more
wiley +1 more source
Slave-wheel device capable of automatically adjusting in pace with unevenness of ground surface
, 1998 本设计属于一种自动导航车车轮随动装置。其结构是上面为连接法兰,下面装有支架,支架一侧装有弹簧盒,盒内装有缓冲弹簧,中间为拉杆,一端连接摆动臂,中间通过固定轴,摆动臂端头安装随动轮,随动轮在不平地面上走动,利用弹簧压缩的功能实现自动调节作用。优点:结构简单,利用缓冲弹簧压缩调整随动轮高低,可在不平地面上走动 ...
李凤君
core +1 more source
Conservation Biology, EarlyView.Abstract Site fidelity is the tendency for animals to repeatedly return to the same locations, either within or between years. Site fidelity enables animals to utilize knowledge of previously visited locations, including assessments of seasonal variations in health and mortality risks (e.g., predation), resource availability, and social benefits such ...
Tobias A. Ross +13 more
wiley +1 more source
Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
wiley +1 more source
Using the capabilities approach to achieve people‐centered conservation
Conservation Biology, EarlyView.Abstract Top‐down interventions carried out by state and nonstate institutions to conserve biodiversity and improve the lives of forest‐proximate people (FPP) in the Global South tend to reflect economistic understandings of human well‐being. More progressive and people‐centered conservation projects are guided by normative visions of how the world ...
Arthur Rodrigues +4 more
wiley +1 more source
High temperature performance of an optical microfibre coupler and its potential use as a sensor [PDF]
, 2012 The dependence of the transmission spectrum of an optical microfibre coupler at high temperatures is investigated experimentally. Results show a temperature sensitivity up to 36.59 pm/°C at a taper waist outer diameter of 2.5 µm; such a temperature ...
Brambilla, Gilberto +6 more
core +1 more source