Results 11 to 20 of about 2,453 (155)
Wildlife Letters, Volume 1, Issue 4, Page 163-170, December 2023., 2023 Per‐ and polyfluoroalkyl substances (PFASs), especially long‐chain perfluorinated carboxylates and perfluorinated sulfonic acids, were considered as global environmental contaminants due to their wide industrial and commercial applications and their threat to human and animal health.
Luyao Wang +7 more
wiley +1 more source
Are U‐shaped relationships between risk factors and outcomes artifactual? 风险因素与结果之间的U或J型关系以及分布偏倚的作用
Journal of Diabetes, Volume 14, Issue 12, Page 815-821, December 2022., 2022 Highlights U‐shaped relationships between three common cardiovascular risk factors (weight, systolic blood pressure, and insulin) and hazards of composite cardiovascular outcomes were analyzed in three study samples: entire sample, “high” subgroup, and “low” subgroup.
Reema Shah +2 more
wiley +1 more source
Journal of Advanced Nursing, Volume 77, Issue 3, Page 1567-1577, March 2021., 2021 Abstract Aims We describe an innovative research protocol to: (a) examine patient‐level longitudinal associations between nurse staffing practices and the risk of adverse events in acute care hospitals and; (b) determine possible thresholds for safe nurse staffing.
Christian M. Rochefort +6 more
wiley +1 more source
Journal of Mathematics, Volume 2021, Issue 1, 2021., 2021 Fractional order research has interdisciplinary characteristics and has been widely used in the field of natural sciences. Therefore, fractional order research has become an important area of concern for scholars. This paper used 2854 literatures collected from China National Knowledge Infrastructure (CNKI) database from 2001 to 2020 as the data source
Yunfei Yang +4 more
wiley +1 more source
Conservation Biology, Volume 34, Issue 1, Page 194-206, February 2020., 2020 Abstract Stand structure develops with stand age. Old‐growth forests with well‐developed stand structure support many species. However, development rates of stand structure likely vary with climate and topography. We modeled structural development of 4 key stand variables and a composite old‐growth index as functions of climatic and topographic ...
Yuichi Yamaura +6 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2008 阐述了特殊函数——冗余函数、线性函数、自反函数、自双反函数的定义.讨论了它们的有关谱系数的性质.据此提出了这四个函数的特点的四个定理，给出了相应谱系数图的特点，得到了基于谱技术的谱系数图检测冗余函数、线性函数、自反函数、自双反函数的新方法.实例展示了基于上述定理的谱系数图检测上述函数的过程.实例表明该方法具有直观、简单等特点.
ZHOUZhen-feng(周振峰) +2 more
doaj +1 more source
Uniform B-spline of order four with two independent shape parameters(具有两个独立形状参数的四阶均匀B样条)
Zhejiang Daxue xuebao. Lixue ban, 2007 首先给出四阶五次样条函数空间的基础解系，由此得到四阶五次均匀B样条空间一组线性无关的基函数，在此基础上给出具有两个独立形状参数的四阶均匀B样条函数，定义了具有两个独立形状参数的多项式曲线，此曲线以三次均匀B样条曲线为特殊情况，具有与三次均匀B样条曲线相同的端点性质和连续性，同时扩大了调节曲线形状的范围，使曲线调节更加灵活多样.
ZUOChuan-gui(左传桂) +1 more
doaj +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2017 利用现有势函数构造基于Metaball的过渡曲线，此过渡曲线无法兼具拟高阶连续性与形状可调性.针对这一问题，巧妙地从一种带形状参数的曲线模型出发，构造一类带形状参数的有理势函数，并研究该势函数的性质.所构造的有理势函数具有统一的数学模型，不仅能使过渡曲线在端点处达到拟Ck连续，而且还可通过修改形状参数的值调整过渡曲线的形状.实例表明，通过调整有理势函数的次数及形状参数的取值可构造出满足不同拟连续性且形状不同的过渡曲线，以满足实际应用需要.
LIJuncheng(李军成) +1 more
doaj +1 more source
Position domain control technology for six-joint robots [PDF]
, 2022 In the context of the rapid development of intelligent manufacturing, high-precision motion control of industrial robots has attracted increasing research attention.
Ping-jiang WANG +2 more
core +1 more source
Graphic method of detecting special logic function with arbitrary term(检测含任意项特殊逻辑函数的图形方法)
Zhejiang Daxue xuebao. Lixue ban, 2014 线性函数、冗余特殊、自反函数、自双反函数等特殊逻辑函数在电路设计中具有独特的优点.从特殊逻辑函数的定义出发，提出了基于K图检测含任意项线性函数、冗余函数的方法及基于分解图检测含任意项自反函数、自双反函数的方法，并举例说明了具体检测过程.应用结果表明，该图形方法具有直观，便捷等特点.
LIXiaohua(厉晓华) +1 more
doaj +1 more source