Constant thrust programming for a multistage rocket flown in vacuum with a given initial/final thrust-to-weight ratio in an arbitrary stage

The burn time and burnout velocity of a multistage rocket flown vertically in vacuum with constant thrust tangential to the flight path and a prescribed initial/final thrust-to-weight ratio in an arbitrary stage have been determined. The present paper also deals with optimal staging under given conditions of flight.     

Therapists' reactions to treatment of survivors of political torture.

Working with survivors of political torture and war trauma can trigger strong emotional responses in the therapist. As more survivors seek treatment, it is essential to identify and develop robust support systems for therapists who help their clients confront nearly unspeakable experiences. The emotional reactions of 6 psychotherapists who worked with traumatized survivors in a refugee treatment center were explored. The psychotherapists' reactions were compared with those of therapists who worked in different treatment settings with other presenting problems. The results of the study show that the strong level of responsibility therapists feel for their traumatized clients may hide an emotional strain and may lead to burnout. Suggestions are offered for supporting therapists in this difficult but important work. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dynamique motivationnelle de l'epuisement et du bien-etre chez des enseignants africains.

This study examines the links between antecedents and consequences of Gabonese teachers' (N= 152) work motivation. The theoretical underpinnings are based on the Motivational Model of Job Burnout (MMJB) which is grounded in Self-Determination Theory (SDT) and states that the more supervisors satisfy an employee's need for self-determination, competence, and relatedness, the more self-determined is the latter's work motivation. The level of self-determined motivation has an impact on job satisfaction, which in turn determines life satisfaction. Higher levels of self-determined motivation also buffer emotional exhaustion and psychological distress. The model was confirmed via structural equation modeling and provides support for the validity and generalizability of the MMJB and SDT. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Critical incidents and chronic stressors at work: Their impact on forensic doctors.

Workers in medium- or high-risk professions are often confronted with critical incidents at the workplace. The impact of these acute stressors may be serious and enduring. Many workers also experience chronic job stressors, such as work overload or role conflicts. This study examined the frequently neglected relationship of acute and chronic stressors with self-reported health symptoms, such as posttraumatic responses, fatigue, and burnout. This association was investigated in a sample of forensic doctors in the Netherlands (N = 84). It was found that the more traumatic events the respondents experienced, the more problems they reported in coping with the traumatic events. Chronic job stressors were associated with posttraumatic responses (intrusions and avoidances) and with burnout and fatigue. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

物联网对图书馆事业的双重影响

作为信息产业的第三次浪潮,物联网技术的发展与应用为人与物、物与物之间的信息交换创造了一个全新的平台。国内物联网技术研究与应用的不断深入,将对图书馆事业的发展产生深远影响。文中探讨了物联网对图书馆事业的双重影响,分析了物联网技术带来的优势和挑战,最后强调了以技术为依托,回归服务本质的理念。     

高炉风口回旋区兰炭燃烧行为的数值模拟

为了探究价格较为廉价并且燃烧性能良好的燃料(兰炭)在高炉直吹管、风口、回旋区内燃烧产生的温度、气体成分以及燃料的燃尽率分布情况,根据高炉的实际尺寸,建立了三维物理模型并进行模拟计算。模拟结果表明,当单独喷吹烟煤、兰炭时,回旋区内的温度均为先升高到最高温度后缓慢降低,风口中心线上最高温度分别为2 447、2 415 K。然而,当单独喷入无烟煤、焦化除尘灰(CDQ粉)时,回旋区内温度持续缓慢上升,在回旋区出口处达到的最高温度分别为2 473、2 366 K。烟煤在风口、回旋区内燃烧产生CO的质量分数均高于其他3种燃料;兰炭、烟煤、无烟煤、CDQ粉在回旋区出口处产生的CO质量分数分别为20.82%、26.09%、17.51%、15.74%。采用兰炭喷吹的燃尽率(63.01%)高于采用无烟煤和CDQ粉的燃尽率(分别为58.03%和52.40%),低于采用烟煤的燃尽率(73.13%)。虽然兰炭和无烟煤的组成成分相似,但是从兰炭在风口、回旋区内燃烧产生的温度、气体成分、燃尽率等方面来看,兰炭的燃烧性能要强于无烟煤。     

学习拖延与学习倦怠的关系研究:自我效能感的中介效应

为探讨大学生的学习拖延、自我效能感和学习倦怠的关系,随机抽取400名大学生为研究对象,以《学习倦怠问卷》、《学习拖延问卷》和《自我效能感》为研究工具,采用SPSS13.0进行分析。结果显示:学习拖延与学习倦怠之间存在显著正相关;学习拖延与自我效能感之间呈显著的负相关;学习倦怠与自我效能感之间呈显著的负相关;自我效能感在学习拖延与学习倦怠之间中介作用显著。这表明自我效能感在学习拖延和学习倦怠之间具有中介作用。     

中学教师职业倦怠的心理原因分析及对策

教师职业倦怠问题越来越受到国内外教育研究者的关注。研究表明我国许多中学教师对自己所从事的职业产生了不同程度的倦怠。这是由多种原因综合造成的。职业倦怠不仅影响个人的发展,还会引发一些社会问题。故广大中学教师应积极找出问题根源,通过多种渠道消除心理疲劳,克服职业倦怠。     

高校公共体育教师职业倦怠的探究简

本文通过描述我国高校公共体育职业倦怠的现状,从社会环境、工作环境和个人三个因素分析公共体育教师出现职业倦怠的原因,最终提出对策,对缓解公共体育教师职业倦怠有一定的实际意义。     

心理学视角下高职英语学习倦怠成因探析及对策研究

高职英语教学中较多遇到学生上课动力缺乏、沮丧、厌倦、甚至逃课等一系列不配合和冲突行为的困境。从心理学分析这些＂倦怠＂问题,其成因在于学生对高职英语课程目标、英语在今后职业中的具体需求认识不清,导致学习兴趣减退;长期英语学习依赖,自我效能感低;英语学习挫折多,归因不当;个体人格因素等。据此提出明确目标与需求;体验成功,提高自我效能感;帮助恰当归因;帮助改善不良人格等对策。