Decomposing trait and state variability in general and specific subjective task value beliefs

Expectancy-value researchers have theorized about the extent to which subjective task value components are more trait-like or more state-like. Using a bifactor representation of subjective task value data, the current study aimed to examine the degree of trait-state variation in general subjective task value, specific attainment value, specific intrinsic value, and specific utility value. The relations of both between and within components of the subjective task value constructs with academic self-efficacy beliefs were also examined. Results indicate that, in an undergraduate life science learning context (n = 169), the general subjective task value factor was the most trait-like of the subjective task value constructs. With respect to specific value beliefs, attainment value was composed of nearly equal amounts of trait and state variation, intrinsic value was composed of the largest amount of trait variation, and utility value exhibited the most state-like variation. Additionally, findings suggest that trait-like and state-like general subjective task value, trait-like specific intrinsic value, and state-like attainment value were positively associated with self-efficacy. Finally, we propose a model of trait- state dynamics in subjective task value.     

粘弹性阻尼对非线性弹性杆内纵向应变孤波运动的影响

本文采用基于KdV方程的守恒量建立起来的孤波参数的演化方程组,重新研究了粘弹性阻尼对非线性弹性杆内纵向应变孤波运动的影响,得到了孤波参数的演化规律。结果表明,粘弹性阻尼使孤波逐渐变矮、增宽、速度减慢,最后导致孤波的消失。     

Research on Acoustical Environment Planning of Harbour Cities

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复势Schrdinger方程的均匀化

给出了具有复势Ｓｃｈｒｏｄｉｎｇｅｒ方程的解的存在和唯一性，并证明了它的均匀化理论     

非线性轨道微分方程的解析求解

利用待定函数法研究了非线性轨道微分方程的解析解,求出了一类情形下的四类解析解。     

一类广义Liénard方程周期解的不存在性

研究一类广义Liénard方程周期解的不存在性,给出了其周期解不存在的两个充分条件,用极限集理论与Poincaré切性曲线法证明了所得结果。     

供应商参与对新产品开发效率的影响:以知识获取为中介

本文密切结合新产品开发情境,细分了新产品开发需要获取的三类知识,探讨了供应商参与对获取新产品开发所需要三类知识的影响,进而影响新产品开发效率的机理。以广东省158家企业为研究对象,应用结构方程方法实证了研究假设。结果表明,供应商参与对获取新产品开发所需的三类知识具有显著的正向影响,但是对新产品开发效率没有显著的直接影响;获取新产品开发所需的三类知识对新产品开发效率有显著的正向影响。揭示了知识获取是供应商参与影响新产品开发效率的中介变量。     

影响昆明中小IT企业自主创新能力因素分析

西部中小IT企业自主创新属于技术与市场联合驱动的模式,相对落后于中东部地区。通过对影响企业自主创新能力因素的分析,探析中小IT企业自主创新能力的深层次结构关系,为中小企业自主创新能力的形成和提升提供一定的参考。     

基于四度模型的后发企业知识传导成本因素实证研究

本文基于Nonaka的SECI模型,从知识属性、知识主体和知识活动三个维度刻画后发企业知识传导路径;然后,从知识活动、知识特性、知识接收方特性等层面构建了后发企业成本因素的实证研究框架,并重点探讨传导活动中的广度、密度、速度和交互度的四度成本因素及其影响机理;论文收集调研问卷数据,运用结构方程模型分析方法实证检验相关假设。研究表明,知识属性和知识主体等维度各因素通过对知识活动的作用而影响传导绩效。最后,从广度、密度、速度和交互度等方面提出了促进知识有效传导的机制。     

Taylor's decomposition on four points for solving third-order linear time-varying systems

In the present paper, the use of three-step difference schemes generated by Taylor's decomposition on four points for the numerical solutions of third-order time-varying linear dynamical systems is presented. The method is illustrated for the numerical analysis of an up-converter used in communication systems.