摘要：大多数振荡电路都带有一个非线性的波幅控制．它将振荡保持在所要求的波幅内．使之有最小的输出失真。一种方案是采用输出正弦波的振幅来控制一个电路元件的阻值．如一只工作在三极管特性区的JFET的阻值。另一种控制方法是采用一个限幅电路．使振荡幅度达到限幅器的阈值。当使用限幅器时．输出波幅保持恒定。为了尽量减小非线性失真和输出削波．限幅器应表现出一种“软”的特性。

摘要：传统的培训方法通常由培训教师设计培训对象、内容和方案,而没有充分征求培训对象的意愿。采用参与式方法进行培训需求评估,强调培训对象作为培训主体的责任与作用,并关注培训对象更多地参与到培训需求评估的整个过程。通过培训对象在研究与实践过程中高度参与,与培训教师共同研究确定培训需求的方案,得出的需求分析结果对设计培训具有更明确的指导意义和实用价值。本文在介绍培训需求评估基本概念的基础上,结合社区自然资源管理项目说明了参与式培训需求评估的实施操作过程,并讨论了传统方法与参与式方法进行培训需求评估的差异。

摘要：位于巴黎老街上的Burma Boutique精品珠宝店,如同一只巨大而华丽的首饰盒。在暗色调的烘托下,它用传统元素与现代设计融合的方式,为来宾开启了一场浪漫而神秘的珠宝之旅。Burma,一个独树一帜且历史悠久的珠宝品牌。作为至今仍在沿袭家族传统的珠宝品牌.它始终坚持着自己在现代意义上的豪华风格。也正因如此.Burma珠宝在欧洲广受高端人士的追捧.成为了戛纳电影节等各大红毯时间的宠儿。今年.Burma迎来了自己的85周岁生日。

摘要：由于现代高级编程语言和现有硬件之间的差异日渐增大,常常有必要引入中间语言、并在原始硬件之上构建抽象机。本论文描述了抽象机(Abstract Machine),一种对抽象机的本质特性进行捕捉的结构型模式;这些特性给出了对抽象机的定义。该模式将抽象机的静态特性和动态特性作为分离的组件进行描述,并且还考虑了指令集和这些指令的语义,以及此模式的其他一些重要组件。

摘要：大自然在创造了人类的同时，也赋予了我们温暖的阳光和美丽的风光。在自然中，文人墨客从绿水青山、疏枝密叶中找到点亮思绪的明灯，于是有了“两个黄鹂鸣翠柳，一行白鹭上青天”的闲情；有了“采菊东篱下，悠然见南山”的雅致；有了“似曾相识燕归来，小园香径独徘徊”的丝丝惆怅。在自然中，敏感热情的艺术家从纤枝细叶的纹路里找到了色彩与音符的灵感，无论是贝多芬的《田园交响曲》、德彪西的《新世界交响曲》。还是斯美塔那的《我的祖国》都会将我们带入奇妙的音乐世界。尽显山河田园之美。

摘要：This article deals with the usage of building bricks as a didactic material for the development of architectural design. The building brick game chosen for analysis was the Arckit, since it is suitable for the architectural practice. It is estimated that this game can contribute to the design, representation and presentation of projects. In order to investigate in which aspects Arckit presents possibilities of applications, as well as limitations of use, the article approaches the importance of building bricks as a didactic tool and its use in the field of the architectural design process. From a literature review and an empirical experience, this article reports a qualitative research, where the applicability of the Arckit game was checked. Through a critical reflection based on that experience, it was possible to conclude that whereas its limitations to urban form and linked to the formal vocabulary that composes the grammar of these bricks, the Arckit building bricks represent in architecture a playful and experimental way to think and design, fomenting the creativity and the spatial perception, resulting in a particular experience that can make architecture better connected with dreams and joy.

摘要：最近十年来,随着人们消费习惯的改变,流行音乐市场也发生了很大变化,现场音乐的市场份额不断增加。本文从现场音乐和录制音乐两个方面分析了流行音乐市场需求,采用的数据来自2006—2007年度西班牙"习惯与文化行为调查",通过双变量profit模型来分析现场音乐会的上座率和录制音乐的销售情况。通过分析,我们可以大致描述出两个市场中一般消费者和消费频率较高的消费者大致情况。分析结果显示,两种消费者存在一些相似的方面,这主要表现在性别和文化素养对音乐消费的作用;但同时也存在一些十分显著的差别,这主要表现在时间限制、与经济活动的关系和技术利用这三个方面。最后,我们发现,录制音乐消费和现场音乐消费具有一定的互补性,具有直接的因果关系,这可以解释近年来音乐市场组织制度上发生的一些变化。

摘要：Michoacan brings 2.1% of national GDP, which is 12.5% to agriculture, Livestock is the fourth activity in economic importance in the State and develops in 43% of the territory （58,643 km：） using 27% of the population economically active. Michoacfin ranks third in national cattle inventory （1,608,523 heads） with fifth place in meat production （145,221 ton/year）. The production model is extended cow-breed, subject to season and availability of food （few rains shortage of forage during drought）, with 0.60 production of breed/cow/year, and a marked traditionalism in the form of production; also a high dependency to food based on the grazing. The inadequate national public policy expressed in the paternalism has limited the adoption of strategies to contribute to the solution of this problem. Therefore this study objective was to design and validate a strategy to increase the number of cow breeding/cow/year to season reproduction program, based on the use of synthetic progesterone ＂melengestrol acetate＂ （MGA） as a technology available, secure, easy to use, low cost and likely to be adoptable to the traditional model of production. Work was done in the dry tropics in the municipalities of Churumuco and Tzitzio, Michoacfin State, Mdxico. Used 133 bovine females with crossbreeding Bos indicus, diagnosed as not pregnant, 6.7 and 6.38 years old respectively for each municipality. Oral doses of 0.05 rag/day/cow of MGA during nine days then exposed to the presence of male. Data were analyzed using analysis of variance of a single way. The results indicate that the delivery rate was 58.33% in Churumuco and 61.86% in Tzitzio. This delivery rate represents an increase of 14%-16% of born per year considering that treated females become pregnant with traditional production system management. We concluded that the MGA is an appropriate strategy to the traditional production of tropical dry in MichoacO, n system that increases the rate of births and is likely to be accepted despite th

摘要：1991年，在墨西哥新莱昂州蒙特雷大都市区蒙特雷第一条地铁，长18．5km的1号线竣工并向公众开放。这个预制混凝土分段梁结构由Jean Muller设计，此结构的简支梁标准跨长27m，最大跨长36m。箱梁宽7．40m，高度2．13m。

摘要：曲轴不仅是将活塞的往复运动转化为旋转运动，还必须能吸收由于交替循环的燃料爆炸而产生的振动。在发动机的整个寿命期间，曲轴一直承受扭矩和周期性的正弦弯曲，当发动机工作时，这个关键件将承受连续的高强度的应力循环，因而在设计时要考虑其临界的疲劳强度，曲轴可能是发动机中承受力最大的零件。这个特殊的和复杂的功能决定了曲轴结构的复杂性，从而导致了复杂的热处理工艺。这就是为什么感应淬火技术越来越多的应用于这些复杂零件的热处理之中。