前言

压电和声波理论与器件设计密切相关,特别是压电谐振器的工作原理就是材料中弹性波的压电效应。在信息技术高度发达的今天,压电谐振器作为最基本和最常见的敏感元件,在所有的通讯技术、电子电路、传感器和基于换能器的智能结构中都有着广泛的应用,也激发了固体力学界对这一现象展开大量的理论研究工作。可以说,压电现象作为桥梁将固体力学这一传统学科和新兴的信息技术、生物技术和近年来迅速发展的微机电(MEMS)技术等领域有机地联系了起来,无论从科学研究和工程应用的角度,都赋予了固体力学新的机会和生命力,也为研究和技术人员提供了具有…     

How students perceive teachers’ nonverbal and verbal communication at agricultural universities in Austria,Slovenia and Albania

Purpose: This study attempts to close the research gap created by the fact that existing studies neglect the problem of how effectively agricultural professors from different European countries communicate. The aim is to identify similarities and differences in the numbers of agricultural professors perceived by students as engaging in verbal and nonverbal immediacy communication.

Methodology: An online survey was conducted among students of agricultural universities from Austria, Slovenia and Albania.

Findings: The results show that professors of agriculture from Austria, Slovenia and Albania should generally not be satisfied with their own communication patterns and should thus try to improve their communication. The result also reveals cultural differences in the shares of agriculture professors employing different communication patterns in Austria, Slovenia and Albania. Compared to Austrian and Slovenian students, their Albanian peers perceive that most of their professors use nonverbal immediacy communication. According to Austrian students, the majority of their professors use verbal immediacy. On the contrary, Albanian students assessed that some of their professors employ verbal immediacy.

Practical Implications: The results show the professors of agriculture should improve the way they communicate to students. In particular, the Albanian professors should improve their verbal communication especially in terms of providing timely and quality feedback to students.

Theoretical implications: The study reveals differences in immediacy communication among countries (Austria, Slovenia and Albania) which the scientific literature considers to have a high-context culture.

Originality/Value: Given that no study has yet examined how students perceive professors’ communication in different European countries, this research helps understand the characteristics of agricultural professors’ communication.     

R/S构型的平面确定法

对于一个旋光异构体的费什尔投影式中任一手性碳原子来说,若最小的原子在水平线或在垂线上,只要看其三个原子或基团在水平面上的走向,即可判断出其构型.     

中国文学史新"变"的三个视点

新时期中国学史的叙述在吸取前代和前期学史写作得失的基础上，不断深化着对学史的认识，以多元化的姿态不断丰富着学史的存在。他们的进步值得肯定，而困惑之处也值得反思，要改变困惑的局面，须求新“变”。求变的因素很多，我们的视点有三个：作方法论上的更新，学本位的回归，读接受的纳入。     

Fiber optic biosensor of immobilized firefly luciferase

Luciferase from firefly lantern extract was immobilized on CNBr-activated Sepharose 4B. The kinetic properties of immobilized luciferase were extensively studied. TheK _m′ for D-luciferin is 11.9 μmol/L, the optimum pH and temperature for Sepharose-bound enzyme were 7.8 and 25°C respectively. A luminescence fiber optic biosensor, making use of immobilized crude luciferase, was developed for assay of ATP. The peak light intensity was linear with respect to ATP concentration in range of 10⁻⁹–10⁻⁵ mol/L. A biological application was also demonstrated with the determination of serum ATP from rats bred in low versus normal oxygen environments.     

高校网络教学资源平台的建设

本文阐述构建高校网络教学资源平台的原则、主要内容、实现技术、特色和应用效果,为提高学生学习和科研能力起着促进作用。     

国内外大学校长选拔制度的比较分析

大学校长选拔制度有不同类型:选举与任命两段制、董事会领导下的学校自主遴选制、学校遴选与行政任命结合制、政府直接行政委任制、轮流出任制等等,不同类型的校长选拔制度有其优势与弊端。本文对国内外大学校长选拔制度的类型与优劣作了比较分析,在此基础上,提出了针对我国大学校长选拔的几点启示。     

谈诗歌语言的形象性

诗歌语言的特征是 :形象鲜明 ,新奇动感 ,音韵和谐 ,增强语言形象感的艺术手法 :拟人拟物 ,夸张比喻 ,六根通感     

儿童急性呼吸道感染中流感嗜血杆菌的检测与分型

目的 :为了解儿童急性呼吸道感染中的流感嗜血杆菌与生物分型及其对抗生素的敏感情况。方法 :对 78例急性呼吸道感染儿童采用常规方法进行了培养 ,药敏试验与生物分型。结果 :共分离出流感嗜血杆菌 33株 ,检出率为 4 2 .3% ,在对所有分离株进行的生物分型结果中 ,共检出 5型 ,其中以Ⅳ ,Ⅵ型居多 ,分别为Ⅳ型 8例 (2 4 .2 % ) Ⅵ型 13例 (39.4 % )。 33株分离出的流感嗜血杆菌中 ,全部菌株对氯霉素 ,氧氟沙星敏感 ,头孢拉定株 2 1(6 3.6 % ) 、头孢唑林 19株 (5 7.6 % )、去甲万古霉素 2 3株 (6 9.7% ) 、苯唑青霉素 31株 (93.4 % ) 、复方磺鞍甲基异唑 11株 (33.3% )、红霉素 4株 (13.2 % )。结论 :儿童急性呼吸道感染中流感嗜血杆菌有较高的检出率 ,以生物Ⅵ型和Ⅳ型居多。流感嗜血杆菌存在着严重的耐药倾向。     

Continuity of Care,Caregiver–Child Interactions,and Toddler Social Competence and Problem Behaviors

ABSTRACT

Research Findings: Continuity of care is a recommended practice in child care intended to promote secure and supportive relationships between infants and toddlers and their caregivers. Toddlers (N = 115) between 12 and 24 months were observed in 30 continuity and 29 noncontinuity classrooms. The average duration of care for toddlers with caregivers was 14 months in the continuity rooms and 5 months in noncontinuity rooms. Toddlers observed in continuity rooms experienced higher levels of interactive involvement with their caregivers and were rated by their caregivers as having fewer problem behaviors compared with the toddlers in noncontinuity rooms. Toddlers in rooms with higher staff–child ratios also experienced more involved caregiving. We did not find evidence that the level of involved caregiving mediated the association between continuity of care and toddlers’ social competence or problem behaviors. Practice or Policy: Continuity of care may be a promising practice for programs that strive to provide high-quality care for infants and toddlers.