绢纺厂腐化液中除油微生物的分离探索

对绢纺厂腐化液中微生物菌群进行了研究,其中的微生物主要是细菌.选用3种培养基对腐化液中的除油细菌进行分离,发现三丁酸甘油酯双层平板法更适合除油细菌的分离.对腐化液中细菌和除油细菌的分离结果表明,不同工厂腐化液中细菌总数和种类、除油细菌总数和种类均有较大差别,其中除油细菌数占细菌总数的比例因腐化液不同而不同,最高可达98.5%,最低仅为27.5%.该研究为绢纺原料的生物精练奠定了理论依据.     

利用瘦煤、弱粘煤与无烟煤的配煤炼焦

通过在主焦煤、1／3焦煤和肥煤中添加适当比例瘦煤、弱粘煤或无烟煤，在保证焦炭质量前提下，扩大炼焦用煤资源．降低生产成本。     

气动系统横管式导流旋流分离器的阻力研究

国内煤矿气动系统的主要动力供给方式是由空气压缩机集中供气，通过长距离管道输送给井下各工作面的气动设备使用。水是气动系统中很难避免的污染物，当空气被压缩以后，产生的副产品是水蒸气。压缩空气通过长距离管道输送，由于输气管道采用钢管，铁锈是不可避免的。因此气动系统的主要污染物是水滴和固体颗粒（铁锈、煤尘等），气动设备80％以上的故障是由供气中的污染物造成的。提高气动设备可靠性的关键是控制气动系统的污染物。     

Homoclinic and heteroclinic solutions of cubic strongly nonlinear autonomous oscillators by hyperbolic Lindstedt-Poincaré method

The hyperbolic Lindstedt-Poincaré method is applied to determine the homoclinic and heteroclinic solutions of cubic strongly nonlinear oscillators of the form x + c1 x + c3 x 3= ε f (μ,x,x).In the method,the hyperbolic functions are employed instead of the periodic functions in the Lindstedt-Poincaré procedure.Critical value of parameter μ under which there exists homoclinic or heteroclinic orbit can be determined by the perturbation procedure.Typical applications are studied in detail.To illustrate the acc...     

一次C3锥部结皮的分析处理

我公司2000t/d熟料的新型干法窑生产线,窑尾系统采用史密斯型单系列五级旋风预热器带离线喷腾分解炉。下面就窑尾C3级旋风筒锥部一次结皮谈一点分析处理体会,仅供参考。1C3异常情况2004年3月16日8时,C3级旋风筒出口温度慢慢升高,由原来的750～770℃升至770～790℃,出口负压由-3     

抢抓机遇,走出职业教育的低谷

近几年,我国的职业教育呈现逐年下滑的趋势,已经严重滞后于社会经济发展的需要。各级政府应在职业教育发展方面发挥宏观调控作用。中等职业学校应加强专业建设、师资队伍建设、改变单一办学模式。     

Self-healing anti-icing coatings prepared from PDMS polyurea

With the help of double hydrogen bonds between urea groups, a self-healing anti-icing coating was prepared from polydimethylsiloxane (PDMS)-based polyurea (PDMSPU) that was synthesized from bis(3-aminopropyl)-terminated PDMS and 2,4-toluene diisocyanate. Furthermore, by incorporating a lubricant of inert silicone oil and the cross-linking agent of 1,3,5-tris-(4-aminophenoxy)benzene (TAPOB), the anti-icing coatings exhibited elastic, slippery and durable properties. The wettability, ice shear strength, abrasion-resistance, mechanical and self-healing properties of the prepared anti-icing coatings were systematically investigated. Results showed that the ice shear strength of the PDMSPU anti-icing coating with 150 wt% silicone oil was 7.9±2.9 kPa, significantly lower than that of pristine PDMSPU (74.7±7.2 kPa). The additional introduction of 2 wt% TAPOB could effectively counteract the adverse effect of the lubricant so that the tensile strength (∼1 MPa) of the coating could be comparable to pristine PDMSPU (855±96 kPa). The PDMSPU coating containing 150 wt% silicone oil and 2 wt% TAPOB could maintain the ice shear strength below 50 kPa against 10 icing/deicing cycles and at 12.0±3.3 kPa after 5000 abrasion cycles, and exhibit self-healing properties after treating at 60°C for 10 or 15 h. The slippery self-healing PDMSPU anti-icing coatings could be suitable for anti-icing surfaces in low temperature environments.

     

悬吊轴承断裂的原因分析及结构改进

GX型螺旋输送机上的悬吊轴承多采用滑动轴承,在实际使用过程中,悬吊轴承常出现较大磨损甚至产生裂纹和断裂,严重影响了生产的正常进行.文中通过对悬吊轴承应力状况进行分析,找出了产生裂纹的原因,并提出了良好的改进措施.