优化开放性作业 培养创造性思维

<正>开放性作业是一种内容和结果不具有唯一性,且具有极强的可操作性和自主、主动完成的特点的作业。高中生物引入开放性作业并对其进行优化设计,是对新课改的积极响应,和自主、合作、探究式学习模式相吻合。学生根据自己的实践操作,不仅能够提升对生物学理论联系实际的认识和实践水平,还能够培养学生的创造性思维,促使学生获得全面发展。一、优化作业题型,提升学生思维热度高中生物开放性作业类型众多,对这些题型进行优     

Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory

Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows： the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the ttiird was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d.     

我们班的“西游人物”

吴承恩爷爷写的那部名垂青史的《西游记》,生动刻画出的主人公让我们津津乐道,而我们班也有着形形色色的“西游人物”呢! 稳健型领导非陈钰莫属了。这位“女唐僧”可是巾帼不让须眉呀!记得那次晨读课后的默写,因为王老师走了,许多“齐天大圣”不失时机地造起反来。有的肆无忌惮地放声聊天,有的眉飞色舞交流着．还有的一边站起来大肆地念念有词,一边摆着好玩的Pose……“魔高一尺,道高一丈”。     

对机床齿轮传动同一变速组中模数不同时的优化设计

本文对机床传动中的同一变速组中模数不同时的优化设计方法做了初步探讨,并试图以此为突破点,为机床直齿轮传动优化设计寻到一个简便可行的方法。     

转子挤压组合凹模的应力分析

组合凹模的应力分析是一个非常复杂的问题,对其进行精确分析是解决模具寿命的关键。本文采用有限元分析软件Ansys对转子的组合凹模进行了分析,为转子组合凹模的优化设计提供了依据。     

浅谈可燃液体储罐消防系统的优化设计

对于新时期的化工企业生产运行而言,有关可燃液体储罐消防安全的管理与优化一直是化工装置设备管理的重点与难点所在。本文依据这一实际情况,以可燃液体储罐消防系统为研究对象,从可燃液体储罐火灾特点分析以及可燃液体储罐消防系统优化设计分析这两个方面入手,围绕可燃液体储罐消防系统的优化设计这一中心问题展开了较为详细的分析与阐述,并据此论证了做好消防系统设计作业在最大限度控制危险因素,乃至进一步提高可燃液体储罐安全性的过程中所起到的至关重要的作用与意义。     

浅谈建筑工程中建筑电气节能措施

在建筑电气工程的设计、施工、运行中,如果采取一些有效的技术方法和技术措施,提出完整的建筑电气节能设计和运行管理方案,就完全可以有效地提高能源利用率,实现了节能目标。     

北京 唐丹(先胜)广东 陈丽淳

(2012年4月2日弈于大连西岗)仙人指路对飞右象1.兵七进一象3进52.马二进一…………今年全国象棋女子团体锦标赛,广东队以7战6胜1负的佳绩夺冠。其中所负一场是对北京队,也就是本局陈丽淳执后手负于唐丹(另一局打平)。红方以灵活多变的仙人指路开局,黑方应以稳健的     

矿井残煤资源的开发与利用

为了解决残煤开采阶段后万吨掘进率越来越大、采区接续紧张造的问题,通过对残采块段分析设计及回采、联合布置残采块段等技术措施,解决了难题,并且延长了矿井的服务年限。