优化点焊控制器操作界面设计

电阻点焊以其高效和易于控制的特点在制造业被广泛应用。它的焊接规范参数输入一般通过两种途径,即拨码开关和按键。有些材料和零件需要比较复杂的规范参数,比如,多脉冲(一次焊接中多次通电),各焊点焊接电流不同,焊接电流幅度变化,点、缝焊两用等。一般情况下,可采用增加拨码开关或按     

格法线综合技改

格法线通过熔窑全保温，小炉上升道改造、焦炉煤气聚代液化石油、设备技改、微机配料等，达到了稳定生产，延长窑龄、节约能源、降低成本的目的。     

Thermal—Mechanical Fatigue Behavior and Life Analysis of Cast Ni—base Superalloy K417

In-phase(IP) and out-of-phase(OP)thermal-mechanical fatigue(TMF) behavior of cast Ni-base superalloy K417 was studied.All experiments were carried out under total strain control with temperature cycling between 400-850℃.Both in-phase and out-of-phase TMF specimens exhibited cyclic hardening followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the maximum temperature.OP TMF life was longer than of IP TMF.Various damage mechanisms operating in different controlled strain ranges and phasing were discussed.A few life prediction methods for isothermal fatigue were used to handle TMF fatigue and their applicability to superalloy K417 was evaluated.The SEM analysis of the fracture surface showed that transgranular fracture was the principal cracking mode for both IP and OP TMF.Oxidation was the main damage mechanism in causing shorter fatigue life for IP TMF compared with OP TMF.     

多半波滤光片及其设计

介绍了简单法布里－珀珞滤光片和多半波滤光片的结构和特性，并且对两者的透射率光谱特性进行了比较。分析了多半波滤光片的特点，进行了最优化的膜系设计。文中给出了一种最优化设计的程序流程图。     

In—situ Composite Based on Poly （ethylene terephthalate）,Polyamide and Polyethylene with Microfibres Formed through Extrusion and Hot Stretching

In-situ composites based on dispersed poly (ethylene terephthalate) (PET) or polyamide (PA),and continuous Polyethylene (PE) were prepared through a single screw extruder of Haake rheometer system with a rod-die relatively small in diameter.The extrudate was drawn at a drawing ratio of 3.1,and then quickly cooled in cold water.The specimens were obtained by injection molding at processing temperatures less than 190℃，far below the melting temperature of PET (265℃) and PA (230℃),which can maintain the solid state of PET and PA microfiber phase in the composites.Morphological observation with scanning electron microscopy (SEM) indicated that PET and PA can more or less form in-situ microfibers at compositions studied (0-20 wt pct PET or PA),and especially,PET and PA were almost deformed into fibers at the concentration of 15wt pct.Eensile strength and especially.PET and PA were almost deformed into fibers at the concentration of 15wt pct.Tensile strength and modulus of the blends reinforced by PET or PA microfibers showed to be increased from the tensile test results.The most noticeable improvement of the tensile properties occurred at 15wt pct of PET in PET/PE system,corresponding to the highest microfiber content,where the tensile strength reached 32.5 MPa,whereas only 19.5 MPa for the pure PE.     

浅谈活性炭在水质净化中的作用

随着社会的进步，人们在生产生活中对水质的要求越来越高，活性炭净水技术是一种有效的方法。这里结合实践，阐述了活性炭在饮用水净化和工业用水深度化处理方面的应用，并对活性炭应用的发展前景进行了展望。     

21世纪新型材料－PBO纤维

介绍了21世纪新型PBO纤维的结构，性能及其应用，由于PBO纤维具有优异的拉伸强度，模量和耐热性能，其应用具有广阔的前景。