Materials Literature
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Friction tests of samples of NiCr/FeCr + TiC, NiCr/FeCr + CaF2/graphite + TiC coatings produced on impacts of highly concentrated energy flow pulses on plastering the SHS reagents are carried out. The wear-resistant and antifriction properties of samples in conditions of friction with boundary lubrication are studied.
The objective of the present study is to prepare Naproxen sodium loaded BSA nanoparticles by desolvation technique using different desolvating agent. Naproxen sodium loaded BSA nanoparticles were prepared using desolvation technique. In desolvation technique two methodologies i.e continuous addition and intermittent a…
the appearing of modern point fixed glass faade system was a big step in the development of the faade planning industry. However the application of steel surfaces has been constantly reducing in the last decades. nowadays the faades consist of fast glass material including a small part of steel material. safety is a p…
We have developed the secondary electron emission (SEE) with wide energy range for spacecraft thermal control materials. SEE yield measurement is very important for analyzing charge accumulation on the spacecraft surface. Therefore, we are developing the measurement system without the deceleration voltage and enable t…
The use of nanocarbons as heterogeneous catalyst support offers the possibility of achieving well-dispersed and thermally-stable catalysts. Because of their low internal diffusion resistance and relatively high specific surface, carbon nanotubes and carbon nanofilaments (CNF) are of special interest. This work reports…
In many coastal areas strong currents may occur from tidal effects, rivers discharges and high waves breaking due to abrupt changes in local topography.The modification of the wave fields by currents and vice versa need to be predicted by reliable nonlinear numerical models, when wave and current coexist along and aro…
In thiswork, an investigation of the steady-state electron transport and transient electron transport at high electric field and low-field electron mobility characteristics ofwurtzite ZnO and Zn1_xMgxO are examined using the ensembleMonte Carlo model. TheMonte Carlo calculations are carried out using a three-valley mo…
DD is however the preferred method of exploration drilling for graphite, as the graphite flakes and host rock are relatively undisturbed when retrieved as core ( Figure 4 ). Many exploration companies employ both RC and DD methods to optimise drilling density. Carbon may be present in rocks in several different forms,…
界面活性剤などの両親媒性物質が形成する自己組織体は学術的にも工業的にも利用価値が高く、多くの研究がなされている。近年、従来は不安定であると考えられていたαゲルが多くの注目を集め、様々な研究が行われている。 我々も新たにαゲルを構築しうる素材の開発を進め、その結果、モノアルキル純度を高めたアルキルリン酸が中和剤の選択により非常に安定なαゲルを構築することを見出した。 本稿では特に化粧品分野で行われてきたαゲルの研究例を示しながら、我々が見出したαゲル形成素材について述べる。
摘要： 针对焊缝早期隐性损伤临界状态磁记忆特征提取及评价难题，在大量试验基础上提出双正交法：即焊缝检测路径的正交性和磁场矢量分析的正交性。以Q235B焊接试件为试验材料，通过测量焊缝纵向和横向磁记忆信号分布，引入磁场正交矢量空间图和李萨如图，研究疲劳载荷下焊缝隐性损伤演化的磁记忆表征规律，对比扫描电镜和X射线检测结果，获得焊缝早期隐性损伤临界状态磁记忆特征：隐性损伤出现时李萨如图会产生涡动性的局部闭合，随着损伤的扩展涡动性局部闭合的面积越来越大直至断裂时完全闭合。在此基础上提出正交矢量梯度积分S(K)和正交矢量合成梯度比Kr的概念，建立Kr与剩余寿命Nr定量关系模型，为焊缝早期隐性损伤临界状态的定量研究提供一种新的思路。
The aim of the present work is to measure the activity concentration of naturally occurring radionuclides 40K, 226Ra and 232 Th in different brands of fertilizer samples in Iraq using Germanium detector gamma spectrometry. The results of measurements showed that the mean of specific activities for 226Ra, 232Th and 40K…
摘要： 为了在汽车制造业中实现节能环保的目的，铝合金在车身材料中的应用是实现汽车结构轻量化的重要途径。然而，钢/铝异种材料的连接问题尚未得到解决。考虑采用搅拌摩擦焊方法连接钢/铝异种材料，通过控制搅拌针的压入量，获得两种不同结合方式的接头：一种是搅拌针进入钢材中，形成机械+冶金结合的接头；另一种是搅拌针不进入钢材中，仅通过热传递的方式将摩擦热量传输到钢/铝冶金界面上形成冶金结合的接头。对形成的异种材料接头进行剪切测试和连接界面观察。研究结果表明，钢板上的镀锌层对钢/铝接头的形成具有重要影响。在机械+冶金结合的接头中，钢/铝之间的冶金界面层较厚，主要由Al、Zn元素组成；而在冶金结合接头中，界面层的厚度仅为2～3 μm，且主要由Fe…
Mixed cobalt-copper ferrite-type materials having different compositions were prepared using a coprecipitation technique and mechanochemical or microwave treatment. Various physicochemical methods, such as powder X-ray diffraction, Mossbauer and FTIR spectroscopy, single point BET method, porosity investigations, and…
This paper presents a brief overview of a Partial discharge measurement implemented using LabVIEW. A Partial discharge is a localized electrical discharge that partially bridges the insulation between conductors and which can occur adjacent to a conductor. In high voltage devices such as transformers, a discharge is a…
Elimination and proper disposal of pollutants of emerging concern are a major challenge in environmental remediation. On the other hand, biodegradable and naturally-occurring materials have been successfully used as adsorbents of inorganic and organic contaminants from solutions with very positive results. This resear…
This paper presents a simple method for determining synchronous machine quantities: d- and q-axes time constants and reactances. This method determines them only by drawing additional lines in the frequency characteristics of operational impedances. A new systematic drawing strategy for determining transient/subtransi…
In the through Silicon via (TSV) process as a key technology for the 3-dimensional LSI, particularly in the ‘via-last process', SiNx films of high density are strongly required to prepare at low deposition temperatures. It, however, is generally known that the SiNx film prepared at low temperatures shows low film dens…
When there is integration of wind farm into the power system network, it is vital to check the effect of the transients’ stability. The transient interaction between the transformers affects the magnitude and duration of the sympathetic inrush current. This has become a significant issue for medium or large transforme…
A metamaterial can produce a negative refractive index and apply to a superlens overcoming a diffraction limit. We have previously reported that the measurement of asymmetric paired metal cut wires confirms a negative refractive index with a low loss at 0.42 THz. However, it has yet to be shown whether the structure c…
The influence of the gas pressure on the dielectric barrier discharge with plate electrode was investigated for generating high density Ozone gas. It was impossible for discharge type Ozone gas generator to make ultrahigh density Ozone gas upto 26wt% because of Ozone decomposion by electron impacts. To make ultrahigh…