吹砂、抛光及其电解腐蚀后处理对单晶高温合金表面组织和再结晶行为的影响

采用吹砂处理、砂带抛光、毡轮抛光3种表面处理使铸态单晶(SX)Ni基高温合金叶片表面形成塑性变形层,对叶片表面变形层进行电解腐蚀实验,然后进行标准热处理,研究了单晶高温合金叶片表面处理的变形层及其电解腐蚀后显微组织。结果表明:3种表面处理的铸态单晶高温合金叶片表面变形层深度分别约为6,3.5μm和2μm,并在吹砂处理和砂带抛光的表面变形层周围存在显微裂纹;表面变形层电解腐蚀过渡区内存在大量γ′变形组织,且3种表面处理的塑性变形残存量依次递减,而变形层完全电解腐蚀区内无塑性变形痕迹;标准热处理后,变形层未电解腐蚀区存在凹陷特征和再结晶晶粒,但无塑性变形痕迹;变形层完全电解腐蚀区无明显凹坑和再结晶晶粒。     

蔗糖晶体生长机理的探讨

根据晶体生长理论，分别从能量、动力学和化学观点，阐释了蔗糖晶体生长的机理。     

对1995／96生产期甜菜食糖监测结果的评价与分析

评价食糖质量优劣至关重要的指标是：糖分、水分、还原糖、色值和灰分。通过对１９９５／９６生产期几项指标监测结果进行统计分析，白砂糖和绵白糖各月份每项检测结果的平均值均符合国家食糖标准。除色值外各月份数据变化稳定，色值则表现明显差异性。     

基于TOPSIS和隶属度函数的混合多属性决策模型及算例分析

针对确数、灰数和模糊数指标与递增性、递减性和固定性数值相结合的复杂混合多属性决策问题,以TOPSIS法、灰色系统理论、模糊数和隶属度函数的思想为基础构建了混合多属性决策模型.设计业务流程再造绩效评估算例,验证了该模型的有效性与可行性,并对模型进行了敏感性分析.分析结果表明,该混合决策模型能够准确地对候选方案进行定量排序,且模型中评价指标的选取在决策中起着至关重要的作用.     

设备前期管理的重要性

实行设备全过程管理,降低设备寿命周期费用在提高企业经济效益中占有十分重要的地位。当今企业设备管理大多侧重设备的中后期管理,因此,加强设备前期管理,意义重大。     

Dependence of characteristics of LaB6 films on DC magnetron sputtering power

Lanthanum hexaboride(LaB₆) thin films were deposited on glass substrate by DC magnetron sputtering technology, and the AFM, XRD and scratch tests were used to characterize the deposited films. Influences of sputtering power on the microstructure and the bonding strength between the film and substrate were investigated. AFM observation proves that the dense films are obtained, and the surface roughness is below 4.3 nm. The LaB₆ film shows the crystalline structure with the grain less than 100 nm. The XRD pattern identifies that the crystal structure of the films is in accordance with that of bulk LaB₆, and the (100) crystal face is dominated. The average grain size decreases firstly and then increases with increasing power, and reaches the minimum of 40 nm when the sputtering power is 44 W. Moreover, the intensity of peaks in XRD pattern increases firstly and decreases afterward with increasing power. When the sputtering power is 50 W, the peak intensity reaches the maximum, showing an intense relationship between the power and crystal structures. The scratch test shows that interface bonding strength of the film/substrate is higher at the power of 44 W than the others, due to the formation of the nanosized crystals and their improved surface energy.     

The molecular biological characterization of a strain of biohydrogen-producing anaerobe in Clostridium Genus

The anaerobic process of biohydrogen production was developed recently. The isolation and identification of biohydrogen producing anaerobic bacteria with high evolution rate and yield is an important foundation of the fermented biohydrogen production process through which anaerobic bacteria digest organic wastewater. By considering physiological and biochemical traits, morphological characteristics and a 16S rDNA sequence, the isolated Rennanqilyf33 is shown to be a new species.     

废蜜制取乳酸新菌种

回顾了利用糖蜜等有机化合物进行乳酸生产的技术和菌种研究进展。发酵工业上应用最多的生产乳酸的原料是葡萄糖、蔗糖、淀粉等糖类物质，虽然用纯糖物质发酵得到的乳酸产率高，提取也相对容易，但用高价的糖生产低价格的乳酸在经济上是不合算的，且还浪费了资源。利用含丰富碳水化合物的有机废弃物发酵生产乳酸，不但可以解决废弃物的资源化问题，还能降低乳酸的生产成本，具有广阔的开发前景，甜菜废蜜就是一种可以利用的底物。     

碳氮质量比对发酵细菌产氢性能的影响

利用间歇培养研究了碳氮质量比对纯培养制氢工程中发酵产氢细菌产氢性能的影响。结果显示发酵液中碳氮质量比对产氢细菌Rennanqilyf3的产氢能力和生长有显著的影响。最佳的Rennanqilyf3生长和产氢能力碳氮质量比为3.3,发酵产氢代谢产物以乙醇和乙酸为主,产氢量为3.18mmol,氢气体积分数达到50.8%,葡萄糖利用率为73.2%,终pH值变化不大。碳氮质量比可以成为调控发酵制氢的工程措施之一,最佳碳氮质量比为3.0—3.5。