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81.
重点介绍伊森巴德·金德姆·布鲁内尔(Isambard Kingdom Brunel)的生平和所取得的主要成就。布鲁内尔是工业革命时代英国著名的工程师,因其卓越的工程成就,在英国乃至欧洲有重要的影响。他出身工程世家,曾在法国学习工程专业,后回国跟随父亲参加工程实践,逐步成长为优秀的土木和机械工程师。曾设计建设克利夫顿斜拉桥、大西线铁路,设计多艘大型蒸汽轮船(大西号、大不列颠号和大东号),主持建设多座桥梁、隧道以及医院等。正是布鲁内尔的巨大贡献,使英国的公共交通和现代工程建造有了质的飞跃。  相似文献   
82.
Organizations are faced with a myriad of emerging advanced information technologies. Management may be anxious about the numerous choices while simultaneously yearning for instant realization of benefits promised by the adopted technologies. Management should also be aware that the eventual institutional use of these technologies is dependent upon the learning and training opportunities presented to individuals. Individual approval or established perceptions toward technology appropriateness are mostly idiosyncratic and contingent upon numerous factors such as task goals or prior technology experience. This paper examines the effect of learning experiences with nine communication media, based on perception changes of media appropriateness. Two hundred and ninety-five MBA students participated in a longitudinal quasi-experimental study. Results indicate that traditionally rich media such as face-to-face, group meetings, and telephone were consistently perceived to be more appropriate than emerging new media over time. However, an individual's specific experience with communication media affects perceptions of media appropriateness, and this is particularly evident in computer-based communications. In addition, changes in perception of media appropriateness were directly related to the participants' learning experience and were particularly salient with new media. Furthermore, increased use of some media was found to be associated with decreased use of other media. This study demonstrates that deliberate technology-use mediation can be an effective management mechanism to facilitate an individual's ability to gain experience in the use of new technologies. This paper also suggests that an individual's media experiences and temporal factors are two important but underemphasized factors in understanding and studying technology choice and use.  相似文献   
83.
探讨《远大前程》中的三组主要的二元对立,分析作者对人性本真的肯定和对不切实际的幻想的否定,同时也通过二元对立的分析揭示了大英帝国的罪恶和对海外殖民地的掠夺的事实。  相似文献   
84.
和谐是当今社会的主旋律之一。本文提出了三元和谐英语教学理念,分析了三元与英语教学之间的内在关系,对于英语教学的改革以及高校的和谐稳定具有一定的借鉴意义。  相似文献   
85.
美中西部开发有很多不同之处 ,表现在内涵与性质、地理与历史条件、经济发展状况与经济背景、政治与文化传统、国际国内形势与时代背景等方面。两者的相似之处也有 ,却不是很多。  相似文献   
86.
In this note we present a variant of the improved algebraic method (IAM) using a duality analysis to solve linear programming (LP) problems where more insights to the method are presented. When the coordinates of all vertices are computed, any feasible point can be expressed as a linear combination of the vertices. The objective function is expressed as a weighted sum of its evaluation at the feasible vertices and the optimal point is associated with the highest/lowest coefficient of the weighted sum.  相似文献   
87.
Social workers are often challenged by the complex and ever‐changing dynamics within their relationships with clients, and struggle to find ethical responses within professional boundary grey zones where boundaries with clients can be difficult to identify, yet easy to cross. Social work educators attempt to prepare students for these complex situations, yet in the United States research reveals rates of social work boundary violations that lead one to question the efficacy of social work ethics education. This article describes the educational competencies and instructional strategies that comprise an adaptable course module which was developed in response to this challenge, and intended to increase students' self‐awareness, motivation and professional judgment‐making abilities related to their professional boundaries. The educational competencies for this course include the abilities to: identify boundary violations, apply critical thinking skills to complex professional relationship contexts, increase awareness of self and other, and initiate prevention strategies. In contrast to traditional approaches to education, this article describes instructional strategies that are based on adult‐learning principles, which have the purpose of effectively and creatively teaching topic areas in such a way as to produce behavioural change. These course topic areas include a ‘Professional Relationship Boundaries Continuum’ conceptual framework, boundary violation impacts, personal boundary vulnerabilities, blurring boundary indicators, and risk‐minimizing strategies.  相似文献   
88.
This paper studies the effects of learning and forgetting on the production lot size problem with infinite and finite planning horizons. It is assumed that the determination of the economic manufactured quantity (EMQ) in the succeeding production run is dependent on: (1) the maximum inventory accumulated prior to interruption; (2) the length of the interruption period which incurs total forgetting; and (3) the level of experience in equivalent units remembered at the start-up of the next production run. The optimum operating inventory doctrines is obtained by trading off procurement cost per unit time and the inventory carrying cost per unit time, so that their sum will be a minimum. A numerical example is presented to demonstrate the application of learning and forgetting to the determination of the EMQ.  相似文献   
89.

In an investigation of 418 employees in the Norwegian Postal Service, employees with high learning opportunities and high decision authority were found to be better off on psychological functioning, health and organizational outcome variables than employees with low scores on these variables. Decision authority and learning opportunities had specific and independent impact on subjective health, psychological functioning, coping style and organizational outcome variables. There were, however, also interaction effects between demands, learning opportunities, and decision authority on subjective health. Learning opportunities and decision authority were operationalized with a questionnaire, supplemented with questions on the opportunities to learn skills beyond the present job situation. It is suggested that this is a particularly important dimension for coping with the present day rapid changes in working life, where the objective for many workers will be to broaden their repertoire and competence to increase their flexibility in the labour market.  相似文献   
90.

There are production situations where a production facility (e.g. a machine) is used intermittently to produce lot sizes of certain products. Upon completion of production run, the facility may not be available for a random amount of time due to several reasons, such as: the facility needs to be maintained and the maintenance time is random due to unforeseen circumstances; or that the facility is leased by different manufacturers and the demand for the facility is random. As a result of machine unavailability, stock-out situations might arise. This paper extends the work of Abboud et al . (2000, Computers and Operations Research , 27 , 335-351) by assuming learning and forgetting in production. A new mathematical model is developed with numerical examples and sensitivity analysis provided. Furthermore, this paper determines how the overall inventory cost is influenced by the nature of the random variable that represents the unavailability time of the production facility.  相似文献   
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