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有生产准备大纲的请帮忙发一个!? 我们现需要编制生产准备大纲,请有的朋友帮忙发一个。拜谢!查看更多 0个回答 . 2人已关注
ASPEN hysys 动态模拟培训教材? ASPEN hysys 动态模拟培训教材查看更多 57个回答 . 2人已关注
三峡大坝的得与失? 我国的水资源应该不算丰富的。所以对于这种资源的大规格使用项目一定慎重! 国家对于三峡工程也是经过了多年多角度论证才决定上的。有利有弊。不是一句两句就能权衡的。也不能因为某些自 然 灾 害的发生就推掉它的功绩。 就担心这样的项目被某些所谓专 家或领 导所左右。违背其造福人民的初衷。 我了解很多欧洲国家水资源比我们丰富,但也没见人家上什么三峡工程。 我的观点是尽量少上,地球没有人的时候挺好。 要上就尽量遵守科学原则,不要瞎搞!查看更多 16个回答 . 1人已关注
氢气的爆 zha限问题? 氢气 在 空气 中的爆 zha限4-74%,但氧含量降低后的爆 zha限如何求得,有何计算方法。或是否有现成的数据。 查看更多 6个回答 . 5人已关注
水煤浆添加剂的配方谁能告诉我? 水煤浆 添加剂 的配方谁能告诉我? 查看更多 4个回答 . 4人已关注
如何解决此水压试验问题? 求助 :由于管子锁口没有多留余量,打水压的胀缩头需要 50的直段才能打水压 ,可是现在直段长度只有20mm,怎么处理才能进行打水压 ,还是有什么可行的水压工装能解决?焊接堵板除外查看更多 3个回答 . 1人已关注
目前国内的煤制气情况? 下半年大唐克什克腾煤制天然气准备给首都北京供气啦!!值得庆贺啊!目前正在做的开车准备之中~~~~查看更多 1个回答 . 2人已关注
请教高手,CAD填充比例问题? 回复 1# liuhuazan 我想可以试着填充,可以做个参照尺寸试下,做一个与显示屏一样大小的长方框,在里面填充,对照填充边界填充边界除以绘图比例,填充后将做的长方框放大至与屏幕差不多看看可不可以,另外可能还是通过与所选图纸的大小进行对照,通过视图缩放图纸局部到实际大小来判断是否可以。个人理解,仅供参考。查看更多 3个回答 . 4人已关注
几个简单的制冷题目? 没有哥哥能帮解答一下吗,看来小弟还得自己想办法啊查看更多 4个回答 . 4人已关注
aspen 中最小分离功的求取? 精馏塔 进行物系分离,是 混合物 。不是纯物质(进料与出料都是混合物),现在要算最小分离功.,我理解的是W=H-Ts,所以要知道物系流股的焓值和熵值,这个要怎么得到?或者哪位有别的方法求得最小分离功,不用知道焓与熵进行计算的方法,谢谢 查看更多 1个回答 . 3人已关注
100A角型定水位阀技术参数?    100A角型定水位阀 主要由一角型隔膜式主阀,内部含一片特殊强化尼龙膜片及一只弹簧,并经由主阀外部一组控制浮球阀启闭主阀。当水池水位达到满水位时,控制浮球阀会先行关闭后再传讯关闭主阀。当水池水位下降约10公分后控制浮球阀再行开启,并使主阀重新开启大量补充进水。   100A角型定水位阀工作原理及特点   当水箱和水位下降时,浮球开启,进水管压力升高,致使阀瓣打开,阀门开始供水,相反,水箱水位上升到设定位置时,浮球关闭,活塞下移将密封面均闭,阀门关闭。停止供水。   100A角型定水位安装方便,可省去弯头,节省安装空间。该阀保养简单,灵活耐用,液压水位控制精确。性能可靠,成本低。   标光阀门生产的100A角型定水位阀是一种隔膜式调节水箱和水塔液面高度的阀门。阀门由一特殊强化尼龙膜片将其分为上下两个腔室,当液面达到设定位置时,浮球导阀关闭,上腔压力大于下腔,阀门关闭,即停止供水;当液面下降超过预设位置,浮球导阀开启,上腔压力小于下腔压力,阀门开启,阀门向池内供水。角型定水位阀安装方便,可省去管道弯头,节省安装空间。该阀保养简单、灵活耐用、液位控制准确度高,水位不受水压干扰且关闭紧密不漏水,性能可靠、成本低。浮球可随水池的高度和距离安装。   100A角型定水位阀结构图   100A角型定水位阀适用范围   城建、化工、冶金、石油、制药、食品、饮料、环保   100A角型定水位阀技术参数   适用介质:洁净水   使用压力:0.2~1.0MPa   介质温度:O~80℃   公称压力:0.6、1.0、1.6MPa    100A角型定水位阀主要零件   1、阀体阀盖:铸铁、 球墨铸铁 、铸钢   2、阀瓣: 不锈钢   3、弹簧:不锈钢   4、膜片:尼龙强化橡胶   100A角型定水位阀品牌推荐   福建标光阀门有限公司具有丰富的生产经验,先进的技术水平,严格的质量标准,勤恳的服务态度,快捷的运输效率,在我国阀门市场有很大的影响力,是中国阀门行业的知名品牌。 网址: http://www.cnbgfm.com 联系电话:13313859956 联系QQ:1433351331 查看更多 1个回答 . 5人已关注
vista系统使用apsen7.3的问题? 大家,有在vista系统安装过apsen7.3或其他版本吗? 我安装成功后,打开新(旧)文件都没问题,但是点‘N->’时,就出现提示“failed to create and load form control:MMMaterial.MMMaterial_Input”的提示。然后,什么都 做不了 。 这个提示,在我安装7.0后,就弹出过。正因为这个,我卸载了7.0,装了7.3。发现7.3还是这样,不知是不是系统的问题。 求解决方案?谢谢大家。 查看更多 3个回答 . 5人已关注
循环水中测总磷含量是为了什么? 我是才到化工厂上班的,师傅测总磷的时候,我问为什么要测总磷,师傅叫我不需要知道这个,叫我知道步骤就行了,很郁闷!麻烦谁帮帮我啊!还有一个公式问题,我没见师傅他们做那个标线,我不知道怎样算出结果的查看更多 16个回答 . 4人已关注
氯中含水太低会造成钛材燃烧吗? 在氯处理工段,氯中含水过低的话,会出现燃烧的情况吗? 有经历过的吗? # , , & 查看更多 12个回答 . 4人已关注
英文自我介绍(STATEMENT OF PURPOSE)? 英文自我介绍 STATEMENT OF PURPOSE The heights by great men reached and kept, were not attained by sudden flight, but they, while their companions slept, were toiling upward in the night. --My Motto While I was still as freshman in 1991, I took part in a project in which a milling machine design done by Germans with CAD technology twenty years before was closely duplicated. Staring at the German blueprints, I was struck dumbfounded by the technological gap between the world's leading industrial countries and my motherland. That experience has been goading me to delve deeper and deeper into research of Mechanical Engineering ever since. I felt then that it was my responsibility to help close the gap. Over seven years has passed, and I am glad to say that I have done my share to my country's technological progress in my field. But to actually help put my country at a technological par with that of the West, I must receiver advanced education in a Western university. For that, I am now applying for Ph. D. studies in your distinguished program. Born into a family of academics, I was regarded as a gifted boy in my childhood, as I kept bugging my parents for books of history, nature and science to read when my friends were still engrossed in cartoons and bedtime stories. Watching my intellectual growth closely, my parents always obliged my request. On the strength of my performance in the National University Entrance Examinations, I gained acceptance in 1990 into the Department of Mechanical Engineering at Huadong Institute of Technology (HDIT), a significant cradle of engineering talents based in Shanghai, the country's economic capital. But I did not confine myself to taking courses in my department. In order to satisfy my curiosity in modern science and science and enrich my knowledge, I learned not only the fundamentals of Mechanical Science such as mechanics, metals, process and materials, but also some other courses like Discrete Mathematics. Advanced Algebra, Group Theory etc by auditing them in other departments. My overall GPA was consistently among the top 5% and I received consecutive scholarships for all four years, including Excellent Undergraduate Scholarship of HDIT, the highest honor conferred only to the most distinguished and promising student in an overall evaluation. Thanks to my strong academic record in my undergraduate studies, I won admission into the Maser's Program of Mechanical Engineering at the Zhejiang University (ZJU), currently the country's largest higher-learning institution. I was waived the normally mandatory Admission Test. Focusing my research on Computer Aided Design and Manufacturing, I achieved an overall GPA that was undisputably the best in my class of 30 students. In recognition of my achievements, I was awarded the Guanghua Scholarship, the highest scholarship at ZJU, in two consecutive academic years (1995,1996). Shortly after my enrollment at ZJU, I was assigned as a research assistant to Professor XXX, Vice President of ZJU in the university's CAD Center. Because of my apparent academic strengths, I was encouraged to independently engage in solving the two-dimension irregular shape layout problem in terms of the application of mathematical model of optimization. Through nearly one year hardworking, I came up with three kinds of two-phase heuristic algorithms and a new geometrically-based algorithm. In October, 1995, our research team began to take part in a project Integrated CAD/CAM System for Sheet Metal, part of the country's strategic high-tech development program, dubbed the 863 Program. I first developed the Flat Parts Layout Tool on the basis of my layout algorithms. I then developed a 3D Parts Unfolding Tool, which can convert the part initial 3-D model to 2-D pattern automatically by focusing on the research of anti-process of unfolding: bending process and creating a library of parametric typical shapes. Finally, we developed a software package Inte-SheetMetal, using AutoCAD as the graphic interface and C++ as the main programming language. While I was doing the above project, I finished my Master's thesis: "Research and Implementation of Sheet Metal Part Unfolding and Optimal Layout", which proposed a new approach of obtaining 2-D pattern from 3-D design model and generating certain layout schemes for process planning and manufacturing. Since my graduation in July1997, I have been working as a Research Engineer by the Engineering Design Research Laboratory, CERIS. The primary goal of research conducted in this lab is to develop Engineering Design methodologies and techniques to permit rapid, accurate, conservative design and fabrication of present-day mechanical products. As a member of the lab's staff, I have participated in the GaoHua-601 Project, a large project supported by the China National Ministry of Machine Building Industry. Its goal is to develop many rapid-prototyping systems that will produce prototype parts from concept models as soon as possible. Perhaps because I was familiar with the fatal drawback of conventional CAD/CAM systems, I witched my interest to emphasizing "How to improve the information exchange between design and manufacturing processes?" and thus chose the subproject: "Feature Based Technology in Injection Molding Design." Based on the RPDS (Rapid Product Design System ) other researchers have developed within the Pro/Engineer software environment, I modified the basic data structure of part model and proposed a novel Unified Structure Model (USM). Characterized by its geometric feature parameters and non-geometric feature parameters such as material, process etc., this model provides an efficient framework to maintain the whole product development process. Currently, I am developing a special feature "Definition & Recognition" based on the USM with the help of two members of our research team. In general, I have been developing most of the core models and responsible for integrating all the models into a prototype system. Through these experiences, I have learned the most valuable lessons in my study and work: diligence, team spirit and creativity are the three necessities for successful research work, and I am now confident that I can embark on research work in a new field. As the world awaits the onset of the 21st century, mechanical engineering is playing an ever-increasing role in serving global needs. As mechanical engineers, we should be able to conceive, plan, design, and direct the manufacture, distribution, and operation of a wide variety of devices, machines and systems for energy conversion, aerospace applications, environmental control, and many other applications. In doing all or any of this, we are necessarily involved in computer-aided design and manufacturing, product development, theoretical and applied research. The Mechanical Engineering Department of University of XXX, known for its meticulous work ethics and stimulating academic atmosphere, is the place I have long admired. I am sure that my enterprising spirit, under the seasoned guidance of your distinguished faculty, will translate into knowledge and expertise beneficial to both United States and China. My degree objective is Ph. D, and my major academic interest lies in the following areas: 1) CAD/CAM/CAPP, 2) Computer Graphics & Simulation, 3) Feature-based Design, 4) Design Optimization, 5) Sheet Metal Production, 6) Die and mould Design & Manufacturing. There are several reasons I am confident that I can do well in the courses and research work relating to these areas. Firstly, I have been involved in Mechanical Engineering for about eight years and gained a lot of tremendous experiences in such diverse such as automation and computer. Furthermore, through the "work and study" experiences, I have accumulated lots of practical and theoretical knowledge, not only from books but also from actual work in my interested fields. Finally, I know that I am a quicker learner, and I tend to assimilate new materials in relative ease and speed. This will equip me well to meet the rigorous academic challenge posed in your curriculum. If I am lucky enough to be admitted and financially supported by your esteemed university, I would like to spend three to four years pursuing my Ph.D. in the above areas. After completion of the studies, I will return to my motherland and contribute my learning to improving my country's mechanical industry. 查看更多 2个回答 . 4人已关注
模拟DEA脱酸时遇到问题,愿大家共同探讨? 再生塔 出来贫液中H2S含量很高,始终分馏不掉,不知道是不是软件原因,选用物性包为胺包,希望大家指点 查看更多 8个回答 . 1人已关注
苯乙烯的塔为什么塔釜都比较小?? 近来学习苯 乙烯 装置,发现粗苯乙烯塔和 精苯 乙烯的塔釜都有缩径,液位变化很明显。 这样设计是什么作用???塔釜只有一块2M的 玻璃 板,是不是有点小啊。。。 有波动的话,一会儿快空了,一会儿又快满了,不好操作。。。查看更多 9个回答 . 4人已关注
求助:反应可能进行吗? 这个东西,在 乙醇 溶液中,加入20%的 盐酸 ,可能形成下面的 这个产物吗?谢谢查看更多 4个回答 . 3人已关注
O型圈能用于高压密封吗? 我不知道你从哪获知用在中低压密封,金属O型圈和金属C型圈基本只用于高压密封,而且国标没有任何标准涉及这两种的计算方法,没记错的话是ASME VIII-3有相关内容查看更多 42个回答 . 1人已关注
关于防爆换热器材质的选用? 我是从事铝制 换热器 设计工作,现我公司要生产一批防爆换热器,因材质有所要求,想问一下大家应选用什么材质?查看更多 2个回答 . 3人已关注
简介
职业:江西博雅欣和制药有限公司 - 生产管理人员
学校:湖南理工学院 - 化工系
地区:江苏省
个人简介:相信谎言的人必将在真理之前毁灭。查看更多
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