WANG Mingyu
,
LOU Taiping
,
ZHANG Li
,
SUI Zhitong
钢铁研究学报(英文版)
Owing to smelting vanadiumtitanium magnetite ore, the amount of iron entrainment in slag as droplets is far higher than that in conventional BF slag. However, the iron droplets can be easily settled by blowing air into the molten slag. The results show that more than 80% of iron droplets in titania bearing slag can be settled and separated after treatment. The temperature rise of molten slag during the oxidizing process and the decreased viscosity caused by the component change of slag as well as air stirring in slag both accelerate the iron droplets settling. The vanadium content in the settled iron droplets and the original iron droplets was obtained by chemical analysis. The possible reason for the increased vanadium in the settled iron droplets was discussed by thermodynamic principles.
关键词:
titania bearing slag;oxidation;viscosity change;temperature change;phase separation
Journal of Physics-Condensed Matter
This research purposes to investigate the atomic and electronic structures of the Al/TiC(001) interface with lattice misfit using the ab initio pseudopotential approach. A detailed analysis of the relaxed atomic structure reveals that the atoms over the initial unfavourable sites relax to the favourable sites along the lateral plane. The properties of the semicoherent interface can be taken as averages over the different coherent sites. In addition, the interface atoms in relatively favourable regions are dragged near to the interface, while those in unfavourable regions are pushed away from the interface. Therefore, a large war-ping near the interface is made perpendicular to the lateral plane. The calculated adhesions explain the different wetting results from the viewpoint of structural transition. The subsequent analysis of electronic properties demonstrates that adhesions dominate mainly via the strong Al-C covalent bond.
关键词:
first-principles;1st principles;adhesion;surfaces;misfit;1st-principles;wettability;al
X. Q. Yang
,
L. X. Huo
,
Y. F. Zhang and J. X. Yan (School of Material Science and Engineering
,
Tianjin University
,
Tianjin 300072
,
China)
金属学报(英文版)
The buckling formation and influence factors during welding thin - plated structures were investigated based on finite element methods, An engineering treatment method for prdicating the buckling distor- tion was proposed in here. It was used the equivalent applied thermal - load to simulate the welding residual stress,therefore the calculation of complex welding distoriton can be transformed into 3D elas- tic structural applied- load analyses, which can reduce the quantities of calculating works effectively. The validation of the method was verified by comparison of the numerical simulation and experimental results. The simulation of buckling distorition for side - walled structrues of paseenger train was per- formed and the calculation was in agreement with measuring results in general. It was shown that the main factors for producing the buckling were the intermittent fillet and ping the during welding the stiffened beams and columns to the panel.The existence of the free edge of panels would reduce the crit- ical buckling stress and enlarge the deflection obviously,but the continuous weld in closed frames didn' t degrade the buckling situation.
关键词:
welding buckling distortion
,
null
,
null
汪文云
,
张朝晖
黄金
doi:10.3969/j.issn.1001-1277.2008.06.003
通过对贵州水银洞卡林型金矿苔藓植物野外全面调查,发现贵州水银洞金矿共有苔藓植物15科42属102种,其中苔类植物4科4属5种,藓类植物10科37属96种,角苔类植物1科1属1种. 短柄小曲尾藓Dicranella gonoi Card.、纤毛丝瓜藓Pohlia hisaet. Kop et J.S.Lou、纤枝短月藓Brachymenium exile (Doz.et.Molk) Bosch et Lac.、真藓Bryum argenteum Hedw.为该矿区裸地大量生长的种类,可利用它们作为金属矿山生态恢复进一步研究的素材.通过与露天开采的金矿区苔藓植物丰富度比较,埋藏型金矿区的苔藓植物较露天开采的金矿区的丰富.该区苔藓植物区系地理成分共9种,世界广布和中国特有分布占主要优势(各22种,都占21.57%),其次是东亚成分(共17种,都占16.67%),再次为热带亚洲成分(共16种,都占15.69%).
关键词:
苔藓植物
,
丰富度指数
,
区系
,
水银洞卡林型金矿
Z.L. Ding
,
Y.C. Fan
,
H.B. Qi
,
D.L. Ren
,
J.B. Guo and Z.Q. Jiang Shijiazhuang Railway Institute
,
Shijiazhuang 050043
,
China
金属学报(英文版)
The SiC_p/Al-alloy composite front broke rotors designed for SHANGHAI SANTANA cars were prepared by semi-solid stirring+liquid for ping process. The properties of the composite rotors were examined. The composite brake rotors were subjected to dynamometer tests on a SCHENCK broke testing system, referring to TLll0 standard of VOLKSWAGEN Company. The friction coefficient and thermal response during fade testing and the wear performance of the composite rotors were studied as the function of various parameters, such as braking pressures, initial speeds, initial temperatures, torque and decelerations, and compared with that of conventional cast iron rotors. The results showed that the properties of SiC_p,/Al-alloy composite rotors can achieve the requirements of commercial cast iron rotor.s. The results also suggested that the friction coefficients of composite rotors under different broking conditions are within the deviation band specified by the TLll0 standard, and the temperature rise of the composite rotors at the cud of each fade stop is lower than that of the cast iron rotors. The wear resistance of composite rotors was higher than that of cast iron rotors. The friction and wear mechanism are analyzed.
关键词:
SiC_p/Al-alloy composite
,
null
,
null
,
null
钱鹏
,
李兴华
量子电子学报
doi:10.3969/j.issn.1007-5461.2015.06.008
基于量子信道加密原理,结合Ping-Pong协议控制模式和信息模式的概念,提出了一个量子安全直接通信协议.在此协议中,发送者和接收者用n对Bell态作为量子信道,发送者用controlled-Not操作将单粒子纠缠入量子信道,接收者用controlled-Not操作将单粒子与量子信道解纠缠.通信双方依次执行控制模式和信息模式,控制模式检测窃听,信息模式发送秘密信息.控制模式和信息模式均不会对已建立的量子信道造成破坏,因此建立量子信道的过程仅需执行一次,此后通信双方可以反复进行控制模式和信息模式,从而不断进行窃听检测和秘密信息传输.
关键词:
量子光学
,
量子安全直接通信
,
信道加密
,
窃听检测
刘守平
,
周上祺
,
王佳眉
,
任勤
腐蚀学报（英文）
用金相显微镜、扫描电镜、X射线衍射仪和X射线能谱仪对天然气井油管悬挂器腐蚀失效进行了检测分析，并对天然气井油管悬挂器用35CrMo钢进行了盐雾试验，结果表明，天然气中的水和CO2是引起腐蚀的主要介质，腐蚀产物主要是FeCO3，高速天然气冲刷和钢中的非金属夹杂加剧了腐蚀的速度.
CORROSION FAILURE ANALYSIS OF AN OIL TUBE USED IN NATURAL GAS WELL
LIU Shou-ping,ZHOU Shang-qi,WANG Jia-mei,REN Qin
Chongqing University
A failed oil tube used in natural gas well was examined by optical microscope,scanning electron microscope ,X-ray diffractometer and X-ray spectrometer.Corrosion behavior of 35CrMo steel samples of the oil tube were investigated by means of salt spray tests in the laboratory.The results show that CO2 and H2O are primary factors in the corrosion of oil tube.The corrosion product is FeCO3,non-metallic inclusions in the steel and erosion of natural gas fluid played an important role in accelerating the corrosion.
oil tube;
natural gas well；
35CrMo steel；
failure analysis；
corrosion
关键词:
悬挂器
,
null
,
null
,
null
但永平
,
彭红涛
,
王东云
,
刘芳华
液晶与显示
doi:10.3788/YJYXS20132801.0099
在图像处理中图像数据交换量大,图像数据传输是图像采集处理系统的关键环节.EDMA是DSP中用于实现数据快速交换的重要技术,具有独立于CPU的后台批量数据传输的能力.文章基于TI公司TMS320DM642芯片的图像采集处理系统,利用EDMA的数据传输方式实现视频数据信号高速实时传输.介绍了DSP的外部存储器接口与FPGA的FIFO存储器有机结合进行数据传输,分析了其设计的整体结构与逻辑控制的功能,并着重分析了基于EDMA Ping-Pong数据传输方式的原理及其应用.另外,EDMA中断服务程序调用CPU对已搬移完成的图像数据块进行处理,不仅提高了数据的传输效率,而且节约了CPU资源,使DSP的高性能得到了充分发挥,从而为视频信号处理的实时性奠定了基础.
关键词:
EDMA
,
DSP
,
FIFO
,
数据传输
,
Ping-Pong
