混凝土碳化深度的控制

混凝土的强度和耐久性是混凝土结构的两个重要指标,其中混凝土抗碳化能力是衡量混凝土结构耐久性非常重要的一个指标。通过对混凝土碳化反应机理的探讨,分析导致混凝土碳化的各种因素,提出施工时对混凝土减缓碳化处理的建议。     

钻孔灌注桩施工常见质量问题分析及防治措施

钻孔灌注桩基础属隐蔽工程,且影响其质量的因素较多。针对常见的3类质量问题:成孔质量问题、钢筋笼安装质量问题、混凝土浇筑质量问题,对钻孔灌注桩基础进行剖析,并提出主要的防范及处理办法。     

Correction to: Two New Co(II) Complexes of Picolinate: Synthesis,Crystal Structure,Spectral Characterization, α-Glucosidase İnhibition and TD/DFT Study

Journal of Inorganic and Organometallic Polymers and Materials -     

Beeinflussbarkeit der Bauteilgestalt durch Prozessstellgrößen beim Außenlängsdrehen von AlSi9Cu3 ‐ GJS400 Parallelverbunden

Influence of the process variables on the workpiece form accuracy in the machining of parallel compounds out of AlSi9Cu3 ‐ GJS400 To guarantee excellent work piece quality for the machining of compound materials characteristic interactions between the components have to be considered in the process design. Especially by parallel compounds, where the different components are processed in an alternating manner, the machinability of the compound differs considerably from the machinability of each homogeneous component. Depending on the compound partner the surface topography of a component can vary considerably. Rotationally symmetric compound work pieces primary hold radius and transition deviations. In addition to unequal tool and workpiece deflection the radius deviations results from the different topographies in each component. The surface topography and its measurement methods as well as the process parameters and their influence on the process forces have to be considered for a proper process design.     

非掺半绝缘LEC-GaAs晶片热处理工艺研究

为了获得高质量半绝缘砷化镓单晶片．有必要降低微缺陷密度，开展了晶片热处理工艺的研究．确定了晶片热处理的温度、时间、降温建率等一系列工艺参数，证实丁采用此项工艺能降低LEG-GaAs晶片的砷沉淀密度，郎AB-EPD，同时也保证了晶片的电学参数不受影响。通过对晶片热处理工艺过程和结果进行分析．给出了晶片热处理工艺理论模型的解释。     

Recent research progress of tin oxide as anode materials for sodium-ion batteries

与锂元素相比,钠元素在地壳中储量丰富、分布均匀又价格低廉,继锂离子电池研究受限后,钠离子电池又重新引起了研究者们的关注。在众多钠离子电池电极材料中,锡基金属氧化物因具有较高的理论比容量（1378 mA·h/g）,近年来备受青睐。据文献可知,不同纳米结构的锡基氧化物材料表现出不同的电化学性能。本文从钠离子电池锡基金属氧化物亟待解决的问题出发,系统地总结了特殊形貌的锡基金属氧化物、低维度纳米结构的锡基氧化物材料的复合化、三维结构的锡基氧化物材料复合化、核壳结构的锡基氧化物材料的复合化、特殊结构的锡基氧化物材料的复合化的纳米结构特征及其电化学性能,并展望了锡基氧化物材料的面临的挑战。     

One Dimensional Coordination Polymer of Nickel(II)-Squarate with N,N,N′,N′-tetramethylethylenediamine, {[Ni(μ-sq)(H2O)2(tmen)]·H2O}n

A novel 1D coordination polymer {[Ni(μ-sq)(H₂O)₂(tmen)]·H₂O}_n (H₂sq = squaric acid and tmen = N,N,N′,N′ -tetramethylethylenediamine) has been synthesized and structurally characterized by X-ray crystallography. The spectral (IR and UV-vis.) and magnetic susceptibility are reported. The structure of the complex consists of the bidentate tmen ligand bound to Ni(II) center and a bridging squarate in the 1,3-bonding mode. The distorted octahedral geometry of Ni(II) is completed by two aqua ligands. The structure contains chains of squarato-O ¹ ,O ³ -bridged polynuclear nickel(II) units held together by intermolecular hydrogen bonds interactions between water molecules and oxygen atoms of squarate ligand forming a novel R6 motif.