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Nearly one‐half of the industrial engineering undergraduate interviewees in an investigation of their degree program indicated they previously had been enrolled in another major. Understanding why these students chose to remain in or enter a science, technology, engineering and math (STEM) major when their previous choice lost its appeal is an important piece of the STEM participation puzzle. Our data indicate effective formal and informal recruiting, contact with dynamic individuals who conveyed commitment to and excitement about the department and program, and a department that welcomed immigrants and promoted a clear, relevant image of its discipline's identity, influenced student decisions to relocate within STEM rather than attrite. The high proportion of females within the immigrant students is one factor contributing to the department's attainment of sex parity. Our students' stories offer lessons to other departments for attracting and retaining students who enter the higher education STEM pipeline. 相似文献
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As x Se100 ? x (0 ≤ x ≤ 50) chalcogenide glasses have been studied using measurements of the relative integrated intensity of the last emission line in the Se x-ray spectrum. The results demonstrate that the composition dependence of the relative integrated intensity parameter of selenium, R Se, can be understood in terms of three different coordinations of selenium atoms in the glass network: Se-Se-Se, As-Se-Se, and As-Se-As. R Se is shown to correlate with the rigidity of the glass network, characteristic of selenium-containing binary chalcogenide glasses. 相似文献
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M-201~#乳化剂,是由木糖醇(五元醇)与油酸(或混合脂肪酸)进行酯化后的一种油包水型乳化剂,可用来制备乳化炸药。木糖醇生产过程中的结晶母液约含有70%的木糖醇,将这种废液经真空脱水后,添加一定比例的油 相似文献
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《技术监督实用技术》1997,(5)
201家商业企业受通报表扬为深入开展打击生产和假冒伪劣商品违法行为,国家技术监督局、国内贸易部去年全国亿元以上大型商业企业开展“清柜台”的活动。据对35个省、市上报的材料统计,这次参加“清柜台”活动的有663家年销售额在亿元以上的商业企业,检查了6百... 相似文献
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50米3/时制氧机主要冷源是由活塞式膨胀机产生的。当膨胀机的活塞皮碗和密封皮碗磨损或破裂时,就会影响分馏塔冷量平衡,严重时用提高高压的方法也无济于事,只好被迫停车加温修理膨胀机,直接影响生产。为此,我厂在生产实践中摸索出一个“冷拆、热吹、快装”的维修方法,从拆到装好恢复生产只用1.5小时,现介绍如下: 相似文献
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正1964年,国际局势动荡,中国大陆面临着外来战争的威胁。1964年5月,毛泽东要求在中国大陆西南部的山区尽快建设起三线地区战略大后方;同年8月,国家建委会同相关部门召开了一、二线地区重要设施企业搬迁会议,提出要大分散、小集中,一些国防尖端项目要分散在山区做好隐蔽,并号召:备战、备荒、为人民!第五机械工业部根据会议的精神选址在四川华蓥山区安排建设一些军 相似文献
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阐述了苯乙烯装置通过合理的计算方法和科学的监控手段,掌握进料蒸发预热器TT-201泄漏状况。经过数据分析,优化苯乙烯单元系统操作,延缓了TT-201的泄漏速度。有效地解决了由于换热器泄漏引起苯乙烯产量降低的问题,避免因为非计划停车而造成的损失。 相似文献
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一、前言重氮缩微复制片,是缩微技术中使用极广的一种正性复制胶片。它具有解象力高,影像稳定、加工简便、价格低廉、便于长期保存等优点。FM-201型重氮缩微复制胶片,是将高分子成膜物质、重氮盐、偶合剂及其它稳定助剂,用适当的溶剂溶解成真溶液。在聚酯片基上涂布,经过 相似文献
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A method to determine Joule–Thomson inversion curves, using isobaric-isothermal Monte Carlo molecular simulations, is presented. The usual experimental practice to obtain the locus of points in which the isenthalpic derivative of temperature with respect to pressure vanishes is to process volumetric data by means of thermodynamic relations. This experimental procedure requires the very precise measurement of volumetric properties at conditions up to five times the fluid's critical temperature and twelve times its critical pressure. These harsh experimental conditions have hindered the publication of data for even simple fluids and mixtures. By using molecular simulation, these problems may be circumvented, since the computational effort is roughly independent of the actual value of the pressure or the temperature. In general, Joule–Thomson inversion curves obtained by molecular simulation may be used either as an unambiguous test for equations of state in the supercritical and high-pressure regions or for the prediction of real fluid behavior, should the potential be well known. Both applications are exemplified for a Lennard-Jones fluid for which the complete inversion curve is obtained. 相似文献
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T201H高效脱氧催化剂的应用 总被引:4,自引:0,他引:4
介绍科研新产品T201H高效脱氧催化剂(钯触媒),在武钢氧气厂等单位的稀有气体、金属氢化物、氢气、普氮等生产系统中的净化应用,除氧效果理想,并可取代进口催化剂。 相似文献
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〔故障现象)照片底部有一条宽约3-5毫米的楔形黑边,而且各张都有,观察底片,发现底片底部也有一形状相同的白边,且各卷都有此毛病,排除洗印部门责任,断定是照相机的问题。[故障分析与修理]打开B门并以快门线锁定,使照相机镜头对强光处,观察取景框周边,发现取景框上前方有一黑色条状物体挡住了光线,仔细观察这一黑色物体,原来是位于反光镜后部,反光镜与承接支架之间的铜箔边缘过宽所致。找到了故障根源,便利用小剪刀,小心地将铜箔边缘的多余部分去除,故障便排除了。排除珠江S-201相机故障一例@王长喜 相似文献