心理健康服务需要:概念和评估方法

评估心理健康服务需要是心理健康服务的起点,是保证服务体系善用其资源,以最有效的方式促进群体心理健康、构建和谐社会的前提。心理健康服务需要和心理健康服务需求是两个不同的概念,前者指取决于公众实际与理想心理健康状况之间的差距而提出的对心理健康服务的客观要求,后者指在一定时期内、一定价格水平上人们愿意而且有能力消费的心理健康服务量。评估心理健康服务需要的方法主要有常规结果评估、消费者调查、需要评估的三角测量、构建统计模型和总人口调查。然而,以往心理健康服务需要的概念界定与评估方法过多地关注了病人群体,未来研究应致力于探讨普通人群在预防心理疾病与维持心理健康、促进身心和谐与养成健全人格方面的需要。

基于球面保角映射理论的表面特征标记点匹配法

提出一种基于曲面参数化理论的半自动匹配方法.首先,选择任一样本数据作为参照模型,根据其表面几何特征手动标定特征标记点;其次,利用保角映射方法将全部样本数据映射到同一球形域,根据球面坐标对应关系实现在其他样本表面上特征标记点的自动标定;最后,利用迭代逼近点方法归一化特征标记点在空间的位置.实验考察了统计形状模型的通用性原则和专一性原则,并且比较了球面保角映射中不同约束条件对获得模型质量的影响.实验结果表明:利用球面保角映射3个基准点约束所得模型的专一性指标明显好于零质心约束方法,并且实验所需时间减少近50%.

Modeling porous structure of oil-pressboard interface and its effect on electric field distribution

The oil-pressboard insulation is a typical composite insulation system widely used in the design and manufactory of large power apparatus. The implement of oil-pressboard insulation may lead to surface electrification and discharge at the interface under certain condition. It is of significant importance to take an insight into the phenomenon occurring at the interface. Through experiment, the pressboard is found as a porous material. The interface changes abruptly from bulk pressboard to the bulk oil as a result of the porous structure. A new model is proposed which divides the interface into bulk oil region, transition region, and bulk pressboard region. The width of the transition region is decided according to the microtome figure. The effective permittivity of the transition region is calculated using a new model based on fractal theory. The model is validated and compared with previous calculation model. The effect of the existence of transition region on the electric field distribution is discussed.