Materials Literature
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The problem of the dynamic stability of a reinforced concrete plate armoured in two directions parallel to its edges is considered. To describe the viscoelastic properties of concrete, an integral dependence was adopted with an exponential kernel. The use of this dependence led to a linear differential equation of pla…
The article deals with methods of creating a rectangular wall-beam finite element with eight degrees of freedom per node and continuous stress fields along the boundaries. This effect is achieved by specifying displacement fields in the plane of the element in forms similar to those in finite elements of Bogner, Fox,…
Surface modification of workpieces for cold forming processes is common in industrial practice. Specific surface topographies manufactured by means of shot peening form lubricant pockets, which provide a continuous lubricating film throughout the process. Furthermore, hydrostatic as well as hydrodynamic lubrication ef…
Abstract The purpose of this paper is to discuss the influence of different proportions of bamboo pulp residue on the bending strength, the static bending strength, the water absorption rate, and the microstructure of wood flour/phenolic resin composites. The level of bamboo pulp residue ranged from 0 to 30 percent. A…
摘要： 为了更有效利用索氏体组织具有的超细片层状结构来提升钢板性能，利用TEM和EBSD等方法研究索氏体化处理后的Fe-0.8C钢经过10%～90%的冷轧变形后所产生的组织变化，并结合拉伸试验方法研究了不同冷轧变形量下微观组织变化和力学性能之间的关系，揭示材料的强化机理。结果表明：随着冷轧压下量的增加，珠光体片层间距逐渐降低，在压下量90%的情况下片层距减小至57 nm；冷轧造成的局部塑性应变（KAM值）在低应变下迅速提高，在70%压下量时达到峰值；冷轧过程导致片层铁素体中出现大量位错，并且随着压下量的增加而迅速增加；过拉伸性能测试发现，随着冷轧压下量的增加，拉伸性能随之增加，其强化机制符合界面强化模型，在冷轧压下量达到90%时，…
Polymers are frequently used in fields as diverse as aerospace, biomedicine, automotive and in-dustrial vibration damping, where they are often subjected to high strain rate or impact loading. Poly(vinyl chloride) (PVC), and its plasticised variants (PPVC), are just two examples of this broad category of materi-als. S…
为了探究碘元素对贫S基(GeS1.5)100-xIx和(GeS2)100-xIx(x=5, 10, 20, 30, 40)两个系列玻璃性质的影响, 用快速真空和高温熔融淬冷技术制备了这两个系列的玻璃样品, 对比测试了两组样品的密度、近红外吸收光谱、红外透过光谱、折射率、光学带隙和热膨胀, 并在折射率数据的基础上计算了材料零色散波长.研究表明:随着碘含量的增高, 近红外吸收截止波长发生明显的蓝移现象, 玻璃转变温度和软化温度明显下降, 玻璃的转变温度范围分别为222~330℃和236~332℃, 软化温度范围分别为267~375℃和282~364℃, 膨胀系数增大, 红外透过性明显提高, 光学带隙逐渐增大.通过扫描电子显微镜测定了玻…
БІОРЕСУРСИ І ПРИРОДОКОРИСТУВАННЯ ХІМІЯ
Electron delocalization in conjugated organic molecules is a rate-limiting step in maximizing the charge generation efficiency of next generation photovoltaics and molecular electronics. In particular, ultrafast (<50 fs) delocalization is an important aspect that has been beyond the scope of traditional optical experi…
The pumping properties of the NEG coated vacuum chambers play an important role in the efficiency of vac-uum system of accelerators. The sticking probability of the NEG films is one the most important parameters to characterise the pumping properties of the NEG coated vacuum chambers. In order to investigate the NEG f…
Nowadays, there are many types of roofing designed for steel vertical tanks. Their working properties are also quite different. The paper considers technical solutions of tank roofs constructed for storage of liquid aggressive liquids of oil type and the like. It describes a new technology which is being actively intr…
AbstractThe optical characteristics and structural features of self-assembling nanostructured indium–tin oxide (ITO) films deposited onto substrates heated above 400°C are studied. Estimations of the distribution profiles of the material and effective refractive index in the films under study are obtained by computer…
The description of the installation developed for overlap welding of tube shells of fluoroplast-4D used in the equipment of chemical and petrochemical industries is presented. The results of research of the technological process with application of bounding thermal expansion of internal and external mandrels, and also…
When the oil and gas price was declining rapidly in 2016, it is prudent for global oil operator to identify opportunity to reduce the development cost. This is where all form of cost optimisation and holistic design approach have to be conducted, especially when dealing with High Pressure and High Temperature (HPHT) p…
The article considers a new method for mathematically simulating the structural noise produced during ultrasonic examination of materials having a heterogeneous structure. Structural noise is an unsteady random process, the specific feature of which is that both its dispersion and energy spectrum vary with time. Unste…
Ultra-fast annealing (UFA) is a viable alternative for processing of 3rdgeneration advanced high strength steels (AHSS). Use of heating rates up to 1000°C/s shows a significant grain refinement effect in low carbon steel (0.1 wt.%), and creates multiphase structures containing ferrite, martensite, bainite and retained…
In this paper, wideband high-efficiency Fresnel zone plate (FZP) reflector antennas are investigated and developed. Two simple dual-dipole unit cells with different periodicity sizes are first characterized for the design of Fresnel zone plate reflector antennas. The gain bandwidth of the FZP reflector antennas is the…
AbstractThe results of studies of the structure and properties of composite materials based on amorphous carbon ( a -C:H) films and tin nanoparticles are reported. The composite films are synthesized by the magnetron-assisted ion-plasma sputtering of a combined target in a 92%Ar : 4%CH_4 : 4%H_2 gas mixture. The depen…
The paper presents the analysis of the load-bearing capacity of thin-walled steel bars such as beam-column. It was assumed that the rods are subject to uniformly distributed surface corrosion in the atmosphere over their entire length. As a result of corrosion, the mass loss of these rods, i.e. the thickness of the cr…
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