Age-hardening behavior of a low-gold dental alloy

The age-hardening behaviors of a low gold dental alloy were studied by means of differential scanning calorimetry, hardness testing, X-ray diffraction, optical microscopy and transmission election microscopy. Two distinct hardening behaviors were found at two different aging temperatures. Age-hardening at 290°C was attributed to the formation of the metastable AuCuI′ ordered phase, and the gradual softening in the overaging stage resulted from the slow growth of this phase. The rapid increase in hardness in the early stage at 495°C was due to the precipitation of the metastable AuCuI′ or/and AuCuII′ ordered phases, and the rapid decrease in hardness in the overaging stage was a consequence of the growth of these phases and the loss of the coherency strain at the interface between the spindal-like AuCuI platelets and the matrix.     

Local cone-beam tomography image reconstruction on chords

We develop reconstruction algorithms for local cone-beam tomography for use with generalized scanning trajectories. The algorithms are grounded theoretically in a recently developed chord-based theory for exact image reconstruction and principles of lambda tomography. Being chord based, they are distinct mathematically and conceptually from conventional local tomography reconstruction algorithms. The salient feature of our algorithms is that they permit reconstruction of discontinuities in the profiles of the object function along chords. By consideration of all possible chords, a 3D image that describes the locations of object discontinuities can be reconstructed. Results from microlocal analysis are applied for understanding the object features that can be reconstructed stably by use of the algorithms. A computer-simulation study is conducted to demonstrate the algorithms and compare their performance with an existing algorithm.     

Nuclear Energy—the Strategic Role and Sustainability in China

analyzing the challenges of China’s energy supply, an excellent perspective of nuclear power development in china has been described. Taking into account the midlong term development requirements, a comprehensive, coordinated and sustainable nuclear power strategic consideration and proposal is put forward. Thus our national nuclear industry can not only catch up with the world advanced level in proper time, but also possess the enough stamina of sustainability.     

Enhanced ethanol production inside carbon-nanotube reactors containing catalytic particles

Carbon nanotubes (CNTs) have well-defined hollow interiors and exhibit unusual mechanical and thermal stability as well as electron conductivity. This opens intriguing possibilities to introduce other matter into the cavities, which may lead to nanocomposite materials with interesting properties or behaviour different from the bulk. Here, we report a striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol. The overall formation rate of ethanol (30.0 mol mol(-1)Rh h(-1)) inside the nanotubes exceeds that on the outside of the nanotubes by more than an order of magnitude, although the latter is much more accessible. Such an effect with synergetic confinement has not been observed before in catalysis involving CNTs. We believe that our discovery may be of a quite general nature and could apply to many other processes. It is anticipated that this will motivate theoretical and experimental studies to further the fundamental understanding of the host-guest interaction within carbon and other nanotube systems.     

露天边坡含水炮孔预裂爆破试验研究

针对棒磨山铁矿露天阶炮孔涌水量大的实际情况，研究采用水耦合预裂爆破方法解决含水炮孔的边坡预裂爆破问题，根据炮孔含水高的不同，进行了不同装药结构的水耦合预裂爆破现场试验，经爆破效果测试分析，利用该技术解决含水炮孔的边坡预裂爆破问题是可行的。     

STUDY ON THE TANTALIZING ON THE SURFACE OF TITANIUM ALLOY BY NET-SHAPE CATHODE GLOW DISCHARGING

A new net-shape cathode sputtering target which has a simple structure and a high sputtering was put forward. The multiple-structure made of alloying and coating layers of tantalum was achieved on the surface of TC4 (Ti6AI4V) using this method in double glow surface alloying process. The tantalized samples were investigated by SEM, XRD and electrochemical corrosion method .Results show the complicated tissue of pure tantalizing layer and diffusion layer was successfully formed on the surface of TC4 with the method of net-shape cathode glow discharge, which further improved the corrosion-resistance of TC4 and formed good corrosion-resistant alloys.     

SOLIDIFICATION PROCESS OF α(Al)-Mg_2Ge PSEUDOBINARY EUTECTIC ALLOYS

ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＰＲＯＣＥＳＳＯＦα（Ａｌ）Ｍｇ２ＧｅＰＳＥＵＤＯＢＩＮＡＲＹＥＵＴＥＣＴＩＣＡＬＬＯＹＳ①ＺｈａｏＳｈｅｎｇｘｕ,ＬｉＳｈｕｎｐｕ,ＺｈａｏＤｅｑｉａｎ,ＰａｎＭｉｎｇｘｉａｎｇａｎｄＣｈｅｎＸｉｃｈｅｎＩｎｓｔｉｔｕ...     

MAGNETIC PROPERTIES OF R 3(Fe, Mo) 29 N x (R=Sm OR Y) INTERSTITIAL NITRIDES

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＲ３（Ｆｅ,Ｍ）２９（Ｒ＝ｒａｒｅｅａｒｔｈ;Ｍ＝Ｔｉ,Ｖ,Ｍｎ,Ｍｏ,ｅｔｃ）ｃｏｍｐｏｕｎｄｓａｒｅｎｅｗｌｙｄｉｓｃｏｖｅｒｅｄｒａｒｅｅａｒｔｈｉｒｏｎｉｎｔｅｒｍｅｔａｌｉｃｓ．Ｔｈｅｙａｌｍｏｓｔｅｘｉｓｔ...     

家用电脑、商用电脑及多媒体电脑的组装

计算机技术的不断发展,带动了社会各个领域的进步,同时也给人们的工作、学习带来了极大的方便;多媒体的出现,为人们的业余生活增添了无限乐趣。现在大部分城镇家庭拥有了家用电脑,但如何选择一台合适的计算机,面对大多数非专业人员来说,仍然是一个问题,对一个单位也是如此。当然,进口的原装机,质量都过关,是最好的选择,可价格都很贵。相对来讲,选择一台硬件配置越高的机器,性能越强。过高的价格、过高的配置都会给单位、个人造成资金和资源的浪费。那么如何自己动手,组装一台既能满足需要又能使装出的机器质量比较好,价格又…