有机元素检测仪器在石油化工行业的需求和应用现状

本文通过对国内外石油及石化产品分析检测相关标准技术的调研与收集,以及相关检测仪器特点的分析,对目前包括润滑油、汽油、柴油、煤油、石蜡、石化聚合物、原油等样品类型,共计80个样品在现有仪器上进行测试,使用标准方法对样品中碳、氢、氮、硫元素进行检测,获取样品的检测时间、含量结果、仪器条件等参数,为相关仪器检测提供数据基础.     

A Note on Sensitivity in Uniform Spaces

In this paper, the notions of periodic point are compared, and the sensitivity of semigroup actions on Hausdorff uniform spaces is studied. We show that for an action of a semigroup on a compact uniform space, if it is syndetically transitive and not minimal, then it is syndetically sensitive. We point out that if an action of a semigroup on a uniform space (does not need to be compact) is topologically transitive, not minimal, and has a dense set of s-periodic points, then it is syndetically sensitive. Additionally, we prove that if an action of a monoid on a uniform space (does not need to be compact) is topologically transitive, not minimal, and has a dense set of FM-periodic points, then it is syndetically sensitive.     

Study on optimal control strategy for regulated two-stage turbocharged diesel engine during transient process

Journal of Mechanical Science and Technology - Controlling the turbo bypass valve is valid to enhance transient characteristic of turbocharging system. Appropriate fuel delivery is beneficial to...     

Enhancement of density and ionic conductivity for garnet-type Li5La3Ta2O12 solid electrolyte by self-consolidation strategy

Garnet-type Li₅La₃Ta₂O₁₂ (LLTaO) solid electrolyte is a potential candidate component for future all-solid-state batteries due to its extraordinary stability against the reaction with molten lithium. In contrast with traditional cold isostatic pressing (CIP) method, which generally pursues ultra-high pressure, this paper tries to enhance the density and ionic conductivity of LLTaO by self-consolidation strategy without the assistance of any pressing operations. A LLTaO bulk with a relative density of 95% is obtained. SEM images reveal that the bulk sample is assembled by large dense particles in size of tens of microns indicating that the interstitial space among the particles has been dramatically minimized. Accordingly, the total ionic conductivity and the bulk ionic conductivity at 30?°C are promoted up about one order of magnitude higher to 2.63?× 10^?5 S?cm^?1 and 1.41?×?10^?4 S?cm^?1, respectively. Moreover, the lithium ionic migration network in the crystalline unit cell of LLTaO is first explored from its assembled way. A hexagon-like basic unit with tetrahedral Li1 joint sites and Li1- - Li1 edges is identified. The tetrahedral Li1 sites act as crucial junctions for the transportation of lithium ions. This work would significantly stimulate the development of LLTaO electrolyte membrane technology.     

Garnet-like Li7-xLa3Zr2-xNbxO12 (x = 0−0.7) solid state electrolytes enhanced by self-consolidation strategy

Garnet-like Li₇La₃Zr₂O₁₂ electrolytes with Nb doping are synthesized by self-consolidation method. Different from conventional methods such as cold or hot isostatic pressing, not any pressing assistance is employed throughout the preparation process. Although the preparation process is dramatically simplified, both density and ionic conductivity of the obtained samples are enhanced. Nb-doped content plays a key role in the sintering of the packed precursor powders and in the structure stabilization of the obtained bulk samples. The optimized 0.60?mol Nb-doped sample with relative density of 94%, fine particle boundaries, and solitary cubic structure possesses the maximum total ionic conductivity of 5.22?×?10^?4?S?cm^?1 at 30?°C, which is comparable to the highest reported value of the samples prepared by conventional pressing methods. This work verifies that self-consolidation strategy is effective, reliable, and productive for the preparation of cubic Li₇La₃Zr₂O₁₂ electrolyte, which would significantly facilitate the development of ceramic electrolyte membrane technology.     

水玻璃与磷灰石 方解石作用的溶液化学研究

本文通过浮选实验,ζ-电位与吸附量测定及溶液平衡计算,研究了水玻璃与磷灰石及方解石的相互作用。方解石的溶解度较大,溶解后钙离子浓度较大,水玻璃水解组分HSiO_3及SiO_3~(2-)与方解石表面Ca~(2+)发生化学反应,生成硅酸钙沉淀,硅酸钠在方解石表面的吸附量远大于在磷灰石表面的吸附量。水玻璃使方解石表面负ζ-电位显著增大,在pH>9.5,对方解石有选择性抑制作用。     

近年浮选进展

通过浮选相关文献量的分布比较，从数量上描绘了浮选近5年的发展的概貌。重点评述了浮选以下几方面的发展：浮选设备（浮选机、浮选柱和磁力浮选设备）、浮选新药剂（捕收剂、起泡剂和调整剂）、泡沫中分选（粗粒浮选新方法）、载体浮选、无捕收剂浮选、物理作用（外加电场、磁化、超声波等）与浮选、生物浮选（生物捕收剂和调整剂）、浮选泡沫图象、硫化矿和铝土矿浮选等。此外，简述了国内近年浮选工业实践的进展。     

氟化钠在铝硅酸锌矿石物浮选新工艺试验研究

在季铵盐捕收剂体系中，氟化钠活化了层状硅酸盐矿物高岭石、伊利石和叶蜡石的浮选，而对一水硬铝石的浮选没有影响，可以作为铝土矿反浮选的有效调整剂。氟化钠在矿物表面上发生特性吸附作用，显著降低硅酸盐矿物的Zeta电位，而对一水硬铝石的电位影响不大。AES研究表明，氟离子扩散至硅酸盐矿物颗粒内部，使得其在硅酸盐矿物颗粒上的吸附量很高，而只在一水硬铝石表面发生较低量的吸附。氟离子在硅酸盐矿物颗粒的表面和内部的高吸附量显著降低矿物的动电位，增强捕收剂与矿物的静电作用，从而起到活化作用。     

职业健康安全管理体系在煤矿中的应用

该文依据GB/T28000<职业健康安全管理体系>要求,探讨了煤矿危险源辨识及风险评价的原则、范围、方法和实施过程,并应用于煤矿安全管理中,保障员工的人身安全和健康,减少企业财产损失.     

在水处理中铁氧化物的作用与应用

简要叙述了在水处理中铁氧化物的作用与应用情况。作为磁种，用磁分离的方法去除水中的污染物；作为吸附剂，吸附去除水中的污染物。并对磁种-磁分离除磷工艺和石英砂表面氧化铁膜改性研究的意义提出了看法。