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71.
在1150℃和1250℃、0.1L/min和10L/min的气量下,对通人含不同CO2量的氮气影响粉尘含碳球团还原速度的实验研究表明:以滚动方式所造球团中,氧化物的还原完全以间接还原的方式进行,气氛中非还原气体流速(或流量)的增加对粉尘含碳球团氧化铁还原速度有显著的降低作用,但还原温度提高则对气量增加造成的氧化铁还原速度降低有显著的抵消作用.气氛对球团中锌的挥发速度影响很小,对铅的挥发速度几乎不产生影响.  相似文献   
72.
橡胶化学与物理某些方面的进展   总被引:1,自引:0,他引:1  
  相似文献   
73.
如何利用赣州矿产资源优势发展本地经济,节约资源开采,充分利用现有资源,实现资源的循环利用,保持生态环境的良好发展具有重要意义。本文分析介绍了循环经济、赣州矿产资源及开发利用现状,并提出了实现矿业循环经济的具体措施。  相似文献   
74.
Xu  Junqi  Zhou  Yuan 《铁道工程科学(英文)》2011,19(3):176-180

To deal with the inherent nonlinearity and open-loop instability of the electromagnetic suspension (EMS) system, a new nonlinear control method is proposed. The simulation results show that, for a PID controller, the overshoot of the system response to an airgap step disturbance is about 3 mm, and the transient time is 6 s; however, for the proposed nonlinear controller, there is no overshoot and transient time within 2 s. The proposed method has a faster response and stronger robustness. With a designed bi-DSP suspension controller, this nonlinear control method was implemented on the Shanghai Urban Maglev Test Line (SUMTL) to validate its effectiveness and feasibility.

  相似文献   
75.
International Journal of Control, Automation and Systems - The reinforcement learning problem of complex action control in multiplayer online battlefield games has brought considerable interest in...  相似文献   
76.
In the environment of space radiation, the high-energy charged particles or high-energy photons acting on a spacecraft can cause either temporary device degradation or permanent failure. The traditional probability model is difficult to obtain reliable estimation of unit radiation resistance performance with small samples. Considering that different products will change differently after high-energy particle radiation, we construct a model based on the gamma degradation process. This model can efficiently describe the law of unit radiation resistance variation with the total radiation dose levels under the effect of the total dose and displacement damage. Finally, the proposed model is used to assess the anti-radiation performance of the N-channel power MOSFET device STRH60N20FSY3 produced by STM to obtain average unit radiation resistance, survival probability, survival function, etc.  相似文献   
77.
A new kind of UV-absorbing silicon-fluorinated acrylic emulsion was prepared by emulsion polymerization with 4-allyloxy-2-hydroxybenzophenone, 3-methacryloxypropyltrimethoxysilane (MPS) and hexafluorobutyl methacrylate (HFMA) as functional monomers. The emulsion and its coating were characterized by transmission electron microscope, Fourier transform infrared spectrum (FTIR), X-ray photoelectron spectroscopy, ultraviolet absorption spectrum,thermo-gravimetric analysis, water contact angle (CA), and artificial accelerated aging test. The results indicated that the emulsion with core-shell structure was synthesized and showed prominent absorption peaks at 320 and 350 nm. The water CA of the coating was increased from 70.2° to 86.7° because of the incorporated HFMAs and MPSs. Both of the initial and final decomposition temperatures of the coating were increased by more than 20°C compared with those of the unmodified coating. After 10 days of accelerated aging, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 2.78% and 5.22%, while those of the unmodified coating were as high as 22.94% and 78.57%, respectively. Because of the UV absorbers were incorporated by chemical reaction, the new coating had a more durable and effective anti-ultraviolet performance compared with the coatings the UV absorbers were introduced by physical blending.  相似文献   
78.
中国的稀有金属   总被引:1,自引:0,他引:1  
周廉  殷为宏 《金属学报》1997,33(2):222-224
本文简要介绍了中国稀有金属在研究、生产方面的发展概况。  相似文献   
79.
Accelerated electrospark deposition and the wear behavior of coatings   总被引:5,自引:0,他引:5  
Electrospark deposition (ESD) is a coating process that is featured by low heat input to the substrate. Low coating efficiency and other limitations influence its wider application. The present paper introduces newly designed ESD equipment, by which a higher coating rate can be reached. The relationship among coating thickness, surface roughness, and process parameters such as pulse energy, pulse frequency, and deposition time are presented. Electrospark deposition coating by the new equipment on AISI 1045 steel (with WC-8% Co as electrode) increases the wear resistance by 5 to 8 times. The micromechanism is investigated by scanning electron microscopy observation.  相似文献   
80.
用双层辉光等离子法在钛表面制备的Ti-Pd合金层性能研究   总被引:2,自引:0,他引:2  
采用双层辉光等离子冶金技术在纯钛表面制备了Ti—Pd合金层。其深度大约为90μm,Pd含量呈梯度变化,并出现了TiPd3,TiPd2,Ti2Pd3,Ti3Pd5,TiPd,Ti4Pd等6种化合物相和Pd相。合金层在100℃的NaCl饱和溶液+HCl溶液以及40℃的8.6%H2SO4溶液中的耐缝隙腐蚀性能优于Ti0.2Pd合金;在室温80%H2SO4的溶液中,腐蚀速率仅为0.682mm/a,是Ti0.2Pd合金的18.2%:在室温30%HCl的溶液中,表面Ti—Pd的腐蚀速率仅为0.004mm/a,是Ti0.2Pd合金的12.5%。  相似文献   
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