Materials Literature
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Приведен аннотированный список хирономид из малых водохранилищ бассейнов рек Камы, Урала и Оби на территории Республики Башкортостан. Список включает 54 валидных вида и дополнен данными по количественному развитию личинок в исследованных водоемах. Всего зарегистрировано 60 видов из 31 рода и 3 подсемейств: Tanypodinae…
制备了一种新的稀土配合物Eu(TTA)2(AA)(DPMP)发光材料(TTA=α-噻吩三氟甲酰丙酮,AA=丙烯酸,DPMP=二吡啶并[3,2-a:2,3-c]-8-甲基吩嗪);并利用元素分析和红外光谱分析了配合物的组成与结构。在常温下研究了配合物的荧光性质,结果表明配合物有较好的荧光性质。
Journal of Anthropology and Archaeology is a peer-reviewed international journal, which publishes original papers promoting theoretical, methodological and empirical developments in the discipline of socio-cultural anthropology.
After reviewing the history and mechanism of Whipple bumper shield to protect spacecrafts from the hypervelocity impact by micrometeoroids and orbital space debris, this paper proposes and demonstrates the methodology on the determination of ballistic limit curve of Whipple shield only by numerical analyses by using a…
Изучено химическое равновесие в системе Fe(II)Mo(VI) в широком интервале значений рН растворов с учетом реакций комплексообразования, окисления-восстановления и осаждения. Доказано, что по причине относительно малого значения константы равновесия окислительно-восстановительной реакции возможно квазиравновесное сущест…
以过硫酸钾（KPS）为引发剂,N,N＇-亚甲基双丙烯酰胺（NMBA）为交联剂,丙烯酸（AA）、丙烯酰胺（AM）和绢云母为原料,采用快速水溶液聚合法,在没有氮气保护的条件下制备有机-无机复合高吸水树脂。采用傅里叶红外光谱（FT-IR）、扫描电镜（SEM）对复合高吸水树脂结构进行了表征。考察了单体配比、绢云母用量、丙烯酸中和度、交联剂用量、引发剂用量对高吸水树脂吸液性能的影响。得到了最佳聚合反应条件：丙烯酰胺与丙烯酸的质量比为1∶5,交联剂用量为0.014%,引发剂用量为0.2%,绢云母用量为5%,丙烯酸中和度为80%,反应温度为65℃。在此条件下制备的复合高吸水树脂的蒸馏水吸收倍率为790g/g,0.9%的NaCl水溶液的吸收倍率为…
Low-dimensional materials such as graphene or carbon nanotube show remarkable promise for next generation electronics (transistors), structural materials (composites), energy (thermoelectrics, solar cells), and biology (biosensors, drug delivery). However, owing to nanoscale dimension they are very susceptible to unde…
Solid coordination frameworks (SCF) are crystalline materials based on connections between metal ions through organic ligands. In this sense, combination of polycarboxylate anions and dipyridyl ligands is an effective strategy to produce extended structures. In this context, this work is focused on two novel Cu II -ba…
The coefficients of friction of uncoated high-strength steel sheets and galvannealed high-strength steel sheets were investigated by sliding tests at elevated temperatures using uncoated tools and TD-coated tools with a VC layer on their surface. The temperatures in the tests ranged from room temperature to 700°C. The…
The growth of single-walled carbon nanotubes (SWCNTs) by hot-filament chemical vapor deposition using Co as a catalyst and Co silicide as a catalyst support was investigated at 450°C. Ethanol vapor was used as the carbon source. The density of grown nanotubes was much higher for the sample formed using Co silicide as…
Abstract：Transverse cracks are great menace to casing safety due to their high probability to cause fracture.Transverse crack detection in casing through tubing with transverse probe using pulsed eddy current method is studied by finite element simulations and experiments.Distributions and variations of the eddy curre…
沸騰水型原子力発電システム用の再結合触媒を環状シロキサン（D類）被毒から保護するために，再結合触媒の上流に設置する規則メソ多孔体（Zr-SBA15およびTi-SBA15）を担持したハニカム触媒のD5加水分解性能におよぼす諸因子の影響を評価した．D5加水分解反応の除去率は，滞留時間に大きく依存し，反応温度，触媒担持量（50–150 g/L）の影響はほとんどなかった．線速度2.9 m/s，ハニカム高さ120 mmでは423–523 Kの温度領域でD5除去率は0.95という高い値を示した．本反応系でのD5除去率は1次反応式と頻度因子を線速度の関数としたアレニウスプロットから予測可能である．DSS連続試験での性能低下はTi-SBA15はZ…
Behavior and Physical Properties In This work taking nylon rope experimental test were performed in ASTM D3045 standard for breaking strength. firstly in this project the nylon rope samples are keep in heat aging oven at 70 0 c temperature for 0, 1,3,6,12,23 weeks. after the completion, test the material in universal…
Copyright: © 2014 Shehadi IA. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The vast majority of chemical and biological activiti…
In this paper, the AC resistance of transformer lead-outs is investigated. For this purpose, an equivalent complex permeability model is used. It is shown, that the copper losses can be split into DC (RMS), skin and proximity losses. Parallel bundles of insulated strands are assumed for the lead-outs. Hence, the proxi…
中国上海-2014年4月23日——全球领先的聚酰胺解决方案供应商——索尔维工程塑料在2014年国际橡塑展上隆重推出Sinterline系列新成员——40%玻璃填充的聚酰胺-6粉末。这款新材料专为选择性激光烧结工艺(SLS)而设计,主要面向汽车发动机舱部件、电子电气和消费品等应用领域,旨在满足中国和亚洲市场对高性能快速成型件加工和小规模批量生产日益旺盛的需求。Sinterline采用与索尔维既有产品
Thermal expansion causes problems in semiconductor industry and optical communications where precise positioning is required. There are a few materials that show negative thermal expansion (NTE). It was recently found that perovskite Bi1−xLaxNiO3 and BiNi1−xFexO3 show giant NTE around room temperature. In this study,…
Excited-state processes in T4 organic dye-sensitized Al2O3and TiO2films were studied by femtosecond transient absorption spectroscopy and femtosecond time-resolved photoluminescence dynamics based on up-conversion method.By multiexponential analysis,we obtained the electron injection efficiency of 93% in T4 dye-sensit…
This review describes a newborn method for the single crystal X-ray analysis of non-crystalline or trace amount of compounds in which single crystal samples are prepared without recrystallization of the target compounds. In this method, porous coordination networks are employed as ‘crystalline sponges’ that can absorb…
A silicon-based waveguide-integrated graphene photodetector with an asymmetric metallization scheme is demonstrated. A Bragg reflector is introduced to shorten the length of the light absorption section. High responsivity of ~0.2 mA W−1 at 1550nm under zero bias and broadband photoresponse are observed.