Simultaneous determination of thin-film inertia and shear stiffness using thickness-twist and face-shear modes of an AT-cut quartz resonator

We propose the use of thickness-twist (TT) and face-shear (FS) vibration modes of an AT-cut quartz crystal plate resonator for simultaneous determination of the inertia and stiffness of a thin film deposited on a crystal surface. A theoretical analysis using Mindlin's first-order theory for crystal plates is performed to demonstrate the idea. Expressions for the stiffness ratio and mass ratio between the thin film and the resonator are presented in terms of frequency shifts of FS and TT modes, which are experimentally measurable. A numerical example is given.     

A piezoelectric gyroscope based on thickness-shear modes of an AlN bimorph with inclined c-axes

We propose a new structure for piezoelectric gyroscope application. It consists of a two-layered plate of AlN with inclined c-axes. Through a theoretical analysis, it is shown that when the plate is electrically driven into thickness-shear (TSh) vibration in one direction and is rotating about the plate normal, the rotation causes a TSh vibration in a perpendicular direction with an electrical output which can be used to measure the angular rate of the rotation. Since AlN can be made into thin film devices much smaller than conventional crystal acoustic wave devices, the proposed gyroscope can be made much smaller than existing piezoelectric gyroscopes. The structure can also work with other crystals of class 6mm such as ZnO and polarized ceramics.     

社会阶层分化视角下医患信息行为对医患关系的影响

目前社会阶层分化进程中的医患关系比较紧张,医患信息行为起了很大作用.由于历史原因多数医师未能认识到医患信息行为对医患沟通及医患关系的影响.患者作为医疗信息掌握的弱势群体,其对从医师处获得信息的依赖将长期存在,医师与患者信息行为必然相互影响.针对信息行为建立相应的培训及评价机制是十分必要的.     

Deconstructing antenatal depression: What is it that matters for neonatal behavioral functioning?

This prospective study examined the variability within clinical characteristics of antenatal maternal depression and cortisol levels for associations with newborn infant behavior using the Neonatal Behavioral Assessment Scale (NBAS; T.B. Brazelton, 1984 ). Participants were 81 pregnant women at risk for perinatal depression given their histories of depression prior to pregnancy. We took into consideration not only whether the woman experienced antenatal depression but also whether the depression met diagnostic criteria and variability in timing (onset and occurrence) of antenatal depression and symptom severity. Infants of mothers who became depressed during pregnancy scored less optimally on a subset of the NBAS scales, specifically those scales related to infant neuroregulation. Among the clinical characteristics of depression, the fetus' overall exposure to mothers' depression (reflected in the mean) was most often and most strongly associated with NBAS scales. In terms of timing, third‐trimester exposure was significantly related to newborn behavior. The findings are discussed within the S.H. Goodman and I.H. Gotlib ( 1999 ) model for transmission of psychopathology to offspring of depressed mothers.     

中美教学医院门诊病历管理对比研究

通过文献检索、走访调研并结合笔者时美国教学医院门诊病历管理的实地考察,本文对中美两国教学医院人员对门诊病历管理的认识理念、门诊病历管理的方式、病历的规范设计以及门诊病历的质量控制等方面进行了对比研究.显示我国教学医院在门诊病历管理方面与发达国家存在着差距.从提高临床医疗和医学教学质量、有利于患者疾病的诊治和培养当代优秀医务工作者,促进医学科学技术发展出发,教学医院管理者和临床指导医生应高度重视和规范门诊病历管理.     

Generalized full-information item bifactor analysis

Full-information item bifactor analysis is an important statistical method in psychological and educational measurement. Current methods are limited to single-group analysis and inflexible in the types of item response models supported. We propose a flexible multiple-group item bifactor analysis framework that supports a variety of multidimensional item response theory models for an arbitrary mixing of dichotomous, ordinal, and nominal items. The extended item bifactor model also enables the estimation of latent variable means and variances when data from more than 1 group are present. Generalized user-defined parameter restrictions are permitted within or across groups. We derive an efficient full-information maximum marginal likelihood estimator. Our estimation method achieves substantial computational savings by extending Gibbons and Hedeker's (1992) bifactor dimension reduction method so that the optimization of the marginal log-likelihood requires only 2-dimensional integration regardless of the dimensionality of the latent variables. We use simulation studies to demonstrate the flexibility and accuracy of the proposed methods. We apply the model to study cross-country differences, including differential item functioning, using data from a large international education survey on mathematics literacy.     

认同理论视角下新员工组织社会化的定义及结构维度

组织社会化研究一直以来被批评缺少理论基础, 导致对组织社会化的本质和结构维度缺乏足够认识, 从而影响到在实证中如何测量员工组织社会化的程度。角色认同理论和社会认同理论可以为该研究提供理论基础。在对概念重新进行理论界定的基础上, 揭示了组织社会化本质是新员工角色及社会认同发展的过程。相应地, 组织社会化程度是一个两维度结构。未来研究应以此为基础进一步发展组织社会化量表和理论模型, 并依据认同理论改进实证研究方法。     

程序公正的测量及研究操纵

程序公正是指处理管理事务所依据的原则是否公正。普遍认可的程序公正原则包括一致性、避免偏见、准确性、可修正、代表性、道德与伦理原则。程序公正研究主要有测量和实验操纵两种研究范式。对程序公正的测量主要以单维为主,亦有少数多维测量量表;对程序公正的实验操纵主要以发言权为主,有少数研究对准确性、无偏性或综合几项原则进行操纵。未来研究应考虑程序公正的结构问题,对程序公正的操纵范围进行扩展、操纵方法考虑情景性,还需关注程序公正与程序不公正的差异。     

黄老学派“类法治”思想探析

黄老思想是战国时期兴起的一个哲学政治思想,一方面其强调"道生法",主张法律的道德基础、强调法律的权威与作用;另一方面主张"循法而治",并提出君主"无为而治",弱化统治者的主观能动性,防止统治者对法律的侵害。相对于中国古代的法家、儒家等其它学派法律思想,其法律思想更接近于西方的法治思想,对我国今天的法治建设有一定的现实借鉴意义。     

航线飞行技术性技能与航线飞行阶段任务的关系研究

通过文献、专家意见和问卷调查,构建了现代航线飞行技术性技能多维评价量表。对118名航线飞行员测评数据的验证性因素分析表明,由倾斜控制、偏航控制、平衡控制和速度控制构成的4维模型在飞行准备/滑行、起飞/爬升、巡航、下降/进近/着陆四个飞行阶段均有较好的信度和效度;多元回归分析发现,各维度对不同航线飞行阶段任务均有显著影响。航线飞行技术性技能评价量表的构建为现代航线飞行员选拔与训练、机组驾驶行为规范性评价以及飞行安全管理考核模式的设计奠定了一个良好的工作基础。