汽化冷却技术在加热炉支撑梁上的应用

介绍了汽化冷却技术在加热炉支撑梁上的应用,在生产实践中该技术获得了良好收益,节约了能源,在同类钢铁企业中可广泛应用。     

五元精炼渣系熔化温度的研究

利用正交实验的方法对CaO-Al₂O₃-SiO₂-MgO-CaF₂精炼渣的熔点进行了研究。经过方差分析和显著性检验,得出该五元精炼渣系的最佳组成为:25%Al₂O₃、12%CaF₂、7%MgO、R2(CaO/SiO₂)=2.5。并用SPSS软件回归出了可信度高的组分与精炼渣熔化温度之间的数学关系式:T_m=1 451.3-6.25CaF₂-7.36R₂。     

850kW风力发电机设备安装技术

介绍了850kW风力发电机设备安装工艺流程以及吊装机械的选择方法。对塔筒、机舱、叶轮等主要设备的安装顺序、方法、要点及其注意事项,均进行了详细叙述。     

基于一般访问结构的多重秘密共享方案

基于Shamir的门限方案和RSA密码体制，提出一个一般访问结构上的秘密共享方案．参与者的秘密份额是由各参与者自己选择，秘密分发者不需要向各参与者传送任何秘密信息．当秘密更新、访问结构改变或参与者加入／退出系统时，各参与者的份额不需要更新．秘密份额的长度小于或等于秘密的长度．每个参与者只需维护一个秘密份额就可以实现对多个秘密的共享．在秘密恢复过程中，每个参与者能够验证其他参与者是否进行了欺骗．方案的安全性是基于Shamir的门限方案和RSA密码体制的安全性．     

Investigation of microstructure and mechanical properties of multi-layer Cr/Cr2O3 coatings

Single and multi-layer Cr/Cr₂O₃ coatings were deposited by reactive magnetron sputtering with the total thickness of 7 μm on steel substrates. X-ray diffraction analysis showed that single and multi-layer Cr/Cr₂O₃ coatings have different preferred crystal orientations. Columnar microstructure was detected by transmission electron microscopy both in metal chromium and ceramic chromium oxide layers. Grain size increased with the coating thickness. The value of single and multi-layer coating's fracture toughness is between 4 and 6 MPa·m^1/2 measured with the Berkovich tip indentation, and it is between 2.8 and 3.9 MPa·m^1/2 when measured with the Vickers indenter. The adhesion is about 192.1 and 246.7 J/m² for single and multi-layer coatings, respectively.     

A prediction method for fatigue life of large moving components as function of scale factor: A case of motor‐generator rotor

With the development of science and technology, more and more large moving components have been used in industry, and their service lives have become an important issue. After analysis of the previous results, considering the scale factor, a prediction method for fatigue life of large moving components based on the Basquin relation was proposed at first, and then the magnet pole part of motor‐generator rotor was chosen to make simulation parts with different scale factors mainly in terms of their S‐N curves and fractographies. It was found that with the change of specimen scale factor, the stress concentration factor at transition arc is almost unchanged as well as the fatigue strength exponent, and the fatigue strength coefficient changes linearly. Based on those results, a life prediction method was validated, and the results show that this method is a simple but more precise relation. After fatigue fracture surface and crack growth angle observations and quantitative analyses, the fatigue damage mechanisms associated with the relation among fatigue strength exponent and coefficient and scale factors were explained well. Those studies will provide a new clue to the prediction of the service life for those large moving components.     

武器维修器材包装系列研究(1):研究情况概述

介绍武器维修器材包装系列研究的主要技术成果。该成果运用系统工程原理,从整个器材流通过程出发,通过全面、深入的研究,使器材包装融生产、运输、储存、管理、供应、使用为一体,为器材包装的通用化、系列化、标准化奠定了基础。     

Microwave Absorption of Crystalline Fe/MnO@C Nanocapsules Embedded in Amorphous Carbon

Crystalline Fe/MnO@C core–shell nanocapsules inlaid in porous amorphous carbon matrix(FMCA)was synthesized successfully with a novel confinement strategy.The heterogeneous Fe/MnO nanocrystals are with approximate single-domain size which gives rise to natural resonance in 2–18 GHz.The addition of MnO2 confines degree of graphitization catalyzed by iron and contributes to the formation of amorphous carbon.The heterogeneous materials composed of crystalline–amorphous structures disperse evenly and its density is significantly reduced on account of porous properties.Meanwhile,adjustable dielectric loss is achieved by interrupting Fe core aggregation and stacking graphene conductive network.The dielectric loss synergistically with magnetic loss endows the FMCA enhanced absorption.The optimal reflection loss(RL)is up to−45 dB,and the effective bandwidth(RL<−10 dB)is 5.0 GHz with 2.0 mm thickness.The proposed confinement strategy not only lays the foundation for designing high-performance microwave absorber,but also offers a general duty synthesis method for heterogeneous crystalline–amorphous composites with tunable composition in other fields.     

青岛和大连海区海带(Laminaria japonica)外生细菌的16S rRNA基因序列分析

从采集自青岛和大连的大型褐藻海带(Laminaria japonica)表面分离到22株革兰氏阴性海洋细菌。根据16SrRNA基因序列分析结果,将其分别鉴定为假交替单胞菌(Pseudoalteromonas,Cobetia)菌,嗜冷单胞菌(Psychromonas),交替单胞菌(Alteromonas),产碱杆菌(Alcaligens)和海杆菌(Marinobacter)。其中假交替单胞菌在两地样品中占据绝对优势,但每个产地的假交替单胞菌不能单独聚类在一起,不同海区的海带表面存在遗传关系非常接近的菌株。假交替单胞菌之外的其他菌株于两地样品之间存在种或属水平上的差异。本文结果提示外生细菌的种类既与环境相关,又受宿主的状况影响。对8株受试菌株的拮抗实验结果显示了外生细菌在寻找新型抗生素方面的潜力。