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随着建筑业的高速发展,相应的在建筑物的建设、维修、拆除过程中产生的建筑垃圾也空前增加。据不完全统计,其数量已经占到城市垃圾总量的30%~40%。目前,我国对垃圾的处理多采用堆弃或掩埋的方式,其结果一是造成环境污染,二是占用大量土地,三是浪费了大量的可再生资源。 相似文献
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李宏魁 《混凝土与水泥制品》1989,(1)
在混凝土与水泥制品行业,拌合料的水分控制是个关键环节。据了解,目前有许多厂家在这方面的自动控制几乎都是空白。本文对一种新型有效的水分自动控制仪的工作原理作一简单介绍。我们设计的水分控制仪其控制过程如下:当原料进入搅拌机后,经过预搅拌,检测电极测量物料的导电性能,通过电路控制水阀的出水量。在搅拌过程中,由于混合料 相似文献
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李宏魁 《混凝土与水泥制品》1998,(6):44-45
针对高压水射流技术在纤维板坯切割过程中经常存在的掉压问题,提出了改进的意见,从而可使高压水切割机的工作更稳定,可靠,并提高设备的使用,降低生产成本。 相似文献
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构建以能力为目标的实践教学体系是实现小康社会、加快转变经济发展方式对高等职业教育的客观要求.高职教育必须充分突出实践教学特色,逐步构建和完善实践教学体系.以河南建筑职业技术学院为例,探索了构建高职教育实践教学体系的基本路径,并在此基础上提出了对构建实践教学体系的相关思考. 相似文献
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To understand the effects of the rifle bullet parameters on the bullet-gelatin interaction quantitatively, a finite element model of bullet penetrating gelatin was set up and computational results are compared with experimental ones. The penetration of the rifle bullet into the gelatin was simulated by the nonlinear finite element method. The quantitative analysis of the changes in the gelatin interaction with the rifle bullet were conducted by changing the bullet parameters, such as attack angle on gelatin, initial velocity, warhead's tip and location of mass center of bullet. Results demonstrate that with the increase of the attack angle, instable moment of the bullet moves forward,the length of narrow wound channel shortens,and when penetration is completed diameters of temporary cavities increase, the gelatin energy and energy transmission ratio increases; With the increase of the impact velocity, instable moment of the bullet moves forward, the maximum forces acting on the gelatin and the gelatin energy increase remarkably; the length of narrow wound channel shortens, diameters of temporary cavities increase when penetration is completed, the gelatin energy and energy transmission ratio increase; The warhead's tip and location of mass center have a influence on the instable moment of the bullet and length of the narrow wound channel. The instable moment delays and narrow wound channel increases when the warhead's tip flattens. The instable moment moves forward a little and the narrow wound channel shortens a little when location of mass center moves back. 相似文献
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增湿塔在干法水泥生产工艺中有着重要的作用,具体来讲它的作用是对窑尾高温废气进行喷水增湿降温,将电除尘器入口废气温度降至120~150℃ 相似文献