从物业服务合同的特殊性谈物业服务质量监督机制的完善

无论是前期物业服务合同还是普通物业服务合同,业主都没能介入合同签订过程,无法通过合同顺利表达其权益,有鏊于此,通过完善物业服务监督机制以克服物业服务企业强势地位带来的弊端就显得十分必要.现行的政府监督机制作用有限,行业自律监督缺位,而业主和业主委员会监督机制由于法律规定的不足而无法有效运行.因此,需要切实完善政府有关资...     

Estimation When a Parameter is on a Boundary

This paper establishes the asymptotic distribution of an extremum estimator when the true parameter lies on the boundary of the parameter space. The boundary may be linear, curved, and/or kinked. Typically the asymptotic distribution is a function of a multivariate normal distribution in models without stochastic trends and a function of a multivariate Brownian motion in models with stochastic trends. The results apply to a wide variety of estimators and models. Examples treated in the paper are: (i) quasi-ML estimation of a random coefficients regression model with some coefficient variances equal to zero and (ii) LS estimation of an augmented Dickey-Fuller regression with unit root and time trend parameters on the boundary of the parameter space.     

求y″ py′ qy=f(x)特解的一种新方法

对于二阶常系数非齐次线性微分方程：ｙ″＋ ｐｙ′＋ ｑｙ＝ ｆ（ｘ），给出了当特征根ｒ１ 与ｒ２不等时的特解公式。利用该公式，只需求出两个一阶线性微分方程的特解，就可以得到相应二阶常系数非齐次线性微分方程的特解。