Materials Literature
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This paper shows the results of investigation of a synthesis of pure aluminium oxide layers on cemented carbide cutting tools by the MOCVD (Metalorganic Chemical Vapour Deposition) method using Al(O2C5H7)3 as a precursor. The layers were deposited at 800°C in two stages. Initially, as carrier gases ammonia (99.95 % pu…
分别采用液相法和固相法制备的纳米粉,制得透明性良好的Nd∶(Y0.9La0.1)2O3透明陶瓷,并测试了各样品的结构,光谱及光学性能.结果表明:该陶瓷具有相同的光谱性能|但液相法复合纳米粉制备的透明陶瓷光学性能优于固相反应法制备的透明陶瓷|固相反应法制备的透明陶瓷,由于有部分La2O3分布不均,易导致晶粒生长不均匀和残留少量气孔|长时间球磨混料,也不利于样品性能的提高.
In pen industry, ball pens are becoming more and more popular and its market is growing bigger. However, the technology concerned with ball pens, especially gel ink ball pens, is not mature yet. In this paper, several factors influence the performance of ball pens are taken into account. Such factors include: the mate…
1 Surface du Verre et Interfaces, Unit e Mixte de Recherche CNRS/Saint-Gobain, 39, Quai Lucien Lefranc, 93303 Aubervilliers Cedex, France 2 Laboratoire PMMH, ESPCI/CNRS 10 rue Vauquelin 75231 Paris cedex 05, France 3 Laboratoire de Physico-Chimie des Materiaux Luminescents, UMR 5620 CNRS/Universit e Claude Bernard Lyo…
In this work the approach to the simulation of rolling processes, based on the joint application of engineering techniques, the finite element method and neural networks, called hybrid is presented. Its implementation in the form of software products for the cases of shape and pipe rolling is considered. A neural netw…
PART I: We have synthesized a series of spin S = 1/2 distorted triangular lattice materials Cu2(1-x)Zn2x(OH)3NO3and their long chain alkyl carboxylic group intercalated derivatives, Cu2(1-x)Zn2x(OH)3(C7H15COO).mH2O). Their structural properties, magnetic properties and specific heat have been carefully studied in this…
Surface topology at nanoscale encodes information that directs cell behavior. To identify the exact ranges in size and shape that modulates cell growth, H9c2 cells were cultured onto nanodot arrays with dot diameters ranging from 10 to 200-nm. The nanodot arrays were fabricated by anodic aluminum oxide (AAO) processin…
The works on steel – foam e nergy–absorbing structures for the road barrier W-beam guardrail were carried out because of the necessity of increasing the passive s afety of road barriers [1-5]. A road barrier guardrail is made of steel sections. These types of sections are c haracterized by good strain properties, alth…
valuable suggestions and critical comments.Besides the support from my colleagues I am very happy that I had a couple of private "motivational coaches" around who helped me to focus on my work when it was necessary and who also distracted me from it when it was necessary.Therefore, I am grateful to all my friends, esp…
The Fourier Modal Method (FMM, also called the Rigorous Coupled Wave Analysis, RCWA) is a numerical discretization method which is often used to calculate a scattered field from a periodic diffraction grating. For 1D periodic gratings in FMM the electromagnetic field is presented by a truncated Fourier series expansio…
采用动电位扫描技术研究了新型医用Ti12.5Zr2.5Nb2.5Ta (TZNT)钛合金以及另外三种钛合金在林格氏溶液中的腐蚀行为,并对合金表面形成的钝化膜进行了分析,用皮下埋植试验评价了四种合金的生物相容性.结果表明:与另外三种合金相比,TZNT合金更易进入钝化状态;其钝化电位区间最宽,维钝电流较小,其表面的钝化膜更稳定,具有更优异的耐腐蚀性能;与Ti6Al4V和Ti6Al7Nb合金相比,TZNT和TA2合金植入白鼠体内4周和8周后无论是炎细胞密度还是植入物周围的纤维膜厚度均有所降低,具有良好的生物相容性.
A method of the definition of the bolt shearing load in multitier metal composite joints in design calculations of integral units of aircraft structures is presented. A comparison of the calculated results with experimental data of 3D modeling and calculation of connections in the ANSYS program is made.
We study the AB2 "dimmer-connector" chain within a generalized Hubbard model, which contains site-dependent parameters, and different chemical potentials for A and B sites. Considering one electron per atom, we carry out exact calculations for finite clusters, and derive some asymptotic results, valid for macroscopic…
The nanocomposites exhibit high electrical conductivity, significant non-linear optical behavior and electroluminescence, while having substantially improved mechanical properties relative to the neat polymer. However, very limited attention has been paid to the viscoelastic behavior of nanotube reinforced polymer com…
This paper addresses the influence of shot peening temperature on micro structure evolution and mechanical properties of spring steel 60SiCr7 in the temperature range between 200°C and 250°C. In particular, surface roughness, micro hardness and local distribution of residuai stresses in tine surface iayer were measure…
The power conversion efficiency of cryogenically-cooled InP diode lasers is limited by excess electrical voltage caused by carrier freeze-out. A laser design which specifically mitigates this effect demonstrates peak efficiency of 73% at 77K.
The analysis of known design procedures for centrifugal pumps is lead and the estimation of their applicability to projection the small-size centrifugal pumps for aerospace purpose is realized.
The diffraction pattern of atomic systems with cylindrical symmetry, such as polymers and liquid crystals, represents a set of diffuse spots located on layer lines. The carbon nanotube has cylindrical symmetry, and, correspondingly, its diffraction pattern exhibits properties of similar systems (polymers and liquid cr…
The analysis of technological factor, influencing the quality of ingots, manufactured of rimmed and semi-killed steel grades for various methods of casting was performed.A rational technology of chemical blocking ingots, made of rimmed steel of 8КP grade was offered and implemented, which include application of ferro-…
Abstract Silver and gold nanoparticles (NPs) are sequestered concomitantly into the poly(4-vinylpyridine) (P4VP) and polystyrene (PS) blocks, respectively, of a highly asymmetric PS-block-P4VP monolayer micelle, forming a twodimensional hierarchical arrangement, as evidenced using transmission electron microscopy and…