Investigation on milling force of thin-walled workpiece considering dynamic characteristics of workpiece

Journal of Mechanical Science and Technology - The idea of integral calculus is used in traditional milling force prediction methods. In the traditional method, the milling cutter is divided into...     

Structural,magnetic and magnetostrictive properties of Co1-xLixFe2O4 synthesized by cathode materials of spent Li-ion batteries

In this study, we investigated the effects of substituting Li⁺ for Co²⁺ at the B sites of the spinel lattice on the structural, magnetic and magnetostrictive properties of cobalt ferrites. The Li⁺ substituted cobalt ferrites, Co_1-xLi_xFe₂O₄, with x varying from 0 to 0.7 in 0.1 increments, were synthesized with a sol-gel auto-combustion method using the cathode materials of spent Li-ion batteries. X-ray diffraction analysis revealed that all the Co_1-xLi_xFe₂O₄ nanopowders had a single-phase spinel structure and the lattice parameters decreased with increasing Li⁺ content, which can be proved by slight shifts towards higher diffraction angle values of the (311) peak. Field emission scanning electron microscopy was used to observe the fractured inner surface of the sintered cylindrical rods and the increased porosity resulted in a decreased magnetostriction. The oxidation states of Co and Fe in the cobalt ferrite samples were examined by X-ray photoelectron spectroscopy. High resolution transmission electron microscopy micrographs showed that most particles were roughly spherical and with sizes of 25–35?nm. Li⁺ substitution had a strong effect on the saturation magnetization and coercivity, which were characterized with a vibrating sample magnetometer. The Curie temperature was reduced due to the decrease in magnetic cations and the weakening of the exchange interactions. The magnetostrictive properties were influenced by the incorporation of Li⁺ at the B sites of the spinel structure and correlated with the changes in porosity, magnetocrystalline anisotropy and the cation distribution.     

菱镁矿固硫特性的理论分析

对菱镁矿在固体燃料燃烧过程中的固硫特性进行了理论研究，所得结论对进一步将菱镁矿作为固体燃料燃烧过程中的固硫剂具有非常重要的意义。     

关于安徽华光集团可持续发展的思考

如果我们这个企业能生产长生不老的药品,那么,全世界的钱都会集中到我们的企业来。所以,我们现在需要什么?我们需要新项目,我们需要新产品,这些都要依靠科技进步。     

现代公共建筑餐饮废水处理工艺

概括介绍了现代公共建筑中餐饮废水的水质特点及处理要求,并结合公共建筑餐饮废水处理工艺的特殊性,对混凝法、生物法、电化学法等一些处理工艺及工程应用实例进行了综述.认为具备一体化、体积小、占地少、噪音低、处理效果好、运行管理方便等特点的新型餐饮废水处理技术将得到广泛的应用.     

制备环丙沙星的哌嗪化工艺

采用乙氧羰基哌嗪与环丙羧酸缩合的方法，制备了环丙沙星。同时应用正交设计实验，研究了原料配比、温度、时间及溶剂用量对反应收率的影响，在优化条件下收率可达88．0％。     

Effects of sulfate-reducing bacteria on the corrosion behavior of carbon steel

The influences of the growing process of sulfate-reducing bacteria (SRB) in seawater system on the medium state and corrosion behavior of carbon steel were studied by detecting solution state parameters and using corrosion electrochemical methods. The growing process of SRB in the seawater shows the three stages of growing, death and residual phases. The solution state parameters of the concentration of sulfide, the pH value and the redox potential changed during the three stages of the SRB growing process. And the corrosion rate of D36 carbon steel was accelerated during the growing phase and stable during the death and residual phases. The results indicate that the medium state and the corrosion rate of the steel do not depend on the number of active SRB, but depend on the accumulation of the metabolism products of SRB.     

微型橡胶同步带的研制

研制了一种微型橡胶同步带。强力层材料选用进口玻璃纤维线绳；包布层材料选用无锡产尼龙变形纱织物。带背和带齿胶料配合为：ＣＲ１００；氧化锌４；硬脂酸１；软化剂５；氧化镁５；防老剂３．５；炭黑５０；促进剂ＮＡ－２２，ＴＴ，ＤＭ适量。经检测和实际应用证明，成品带各项性能指标均超过本所企业标准和日本ＪＩＳＫ６３７９—８９标准，并达到国内同类产品的先进水平．     

南水北调中线总干渠水质变化趋势及污染源分析

为了解和掌握南水北调中线总干渠水质状况,依据总干渠26个常规水质断面监测数据,分析了总干渠沿程水质变化趋势。结果表明,主要污染指标(CODMn、氨氮、总氮和总磷)呈现出沿程增加趋势。根据影响总干渠水质的潜在影响因素,分析了7类污染源(直接水污染、大气粉尘沉降、桥面雨水污染、底泥污染、周边垃圾场淋溶液污染、雨洪污染、受污染地下水)及其可能对干渠水质产生的影响程度,并针对不同污染源提出了防控对策,供管理部门决策参考。