Correlation of the actual vitamin B1, B2 and B6 consumption with the biochemical indices of their body allowance

Correlation of actual consumption of vitamins B1, B2 and B6 with biochemical parameters of their utilization has been studied in two groups of workers (one group was engaged in the synthetic leather industry, the second one in the diamond treatment industry). It is shown that the actual utilization of vitamins B1, B2 and B6 correlated well with the stimulation coefficients (SC) of the basal activity of the corresponding erythrocytic enzymes. This correlation can be expressed in an equation of linear regression with a preset SC. Solution of this equation gives the values that can be used in the diagnosis of changes in the vitamins B1, B2 and B6 requirement in certain population groups. The results of the study evidence that vitamin B1 and B6 are especially necessary for workers whose activity is associated with manifest nervous-emotional stress, while the workers engaged in the synthetic leather industry being exposed to dimethyl formamide are in need of vitamin B2.     

不同纯度金属铍热处理时剩余电阻的变化

运用测量剩余电阻的方法，研究了4．2K温度时不同纯度的铍中剩余相的分解与其溶解动力学。结果表明：时效有效温度取决于金属中含有杂质的数量，随杂质数量的增加而提高；高纯度铍（～99．94％）如微合金一样也具有时效倾向；应用剩余电阻概念研究纯铍内部结构转变是非常有效的方法，它可记录时效过程初始阶段的变化（如400℃铍中扩散分解），这些变化用微观观察或X射线衍射分析很难得到。     

Oxygen Nitrogen Mixture Effect on Aluminum Nitride Synthesis by Reactive Ion Plasma Deposition

In the work we investigate synthesis of aluminum nitride films using reactive ion plasma deposition in oxygen/nitrogen gas mixture for application as optical elements for power semiconductor lasers. The experimental refractive index of synthesized AlNO films is dependent on oxygen composition and is decreasing in diapason from 1.76 to 2.035 at elevation of the oxygen fraction.It is shown that the AlN films synthesized by pure nitrogen plasma are polycrystalline and textured. The oxygen presence in discharging gas results to growth of amorphous phase of the AlNO film.     

Energy and food stuff requirements and actual nutrition of foreign students studying in the USSR

The actual nutrition of students of the Patrice Lumumba University of Peoples' Friendship, who had come to the USSR from different countries of the world, was investigated during their studies. Insufficient content of vegetable proteins and fats, Ca and vitamin C, as well as low carbohydrate level were detected in the food of students from all the continents, except for Asia. No significant difference was observed between the energy providing with food and its consumption by the students. The data obtained have been used for validation of the rational nutrition for foreign students studying in the USSR.     

加工方式对AZ31变形镁合金热拉伸流变应力的影响

针对不同方法制备的AZ31镁合金薄板,利用热拉伸试验机和金相显微镜对其在不同温度和变形速率下的流变应力进行了实验研究.结果表明:挤压、交叉、热轧和冷轧等方法制备的AZ31镁合金薄板的应力-应变曲线基本特征是相同的.峰值流变应力随变形温度的升高和应变速率的降低而降低,在低温时具有明显的厚度效应;当温度大于350℃时峰值流变应力几乎不随板材厚度变化而变化;应变速率小于1.0×10-2s-1,变形温度大于150℃下所有AZ31薄板的延伸率均δ≥45%;单向轧制薄板的各向异性随温度提高减小.     

完善耶列姆矿床含重晶石铅锌矿的选矿工艺

试验了５种流程选别铂锌重晶石矿,采用再磨铅祖精矿或再磨铅粗精矿和锌黄铁矿粗精矿的流程可以获得最好的结果和经济效益。     

涂层烘干室的安全使用控制分析

涂装作业中,涂层烘干室是最重要的涂装设备之一,要保证烘烤过程中设备的安全运行,需要从设施、制度等方面进行严格控制.