Materials Literature
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以化学氧化法合成了聚(3,4-乙烯二氧噻吩)(PEDOT)水分散体,通过气相色谱法测定了EDOT聚合转化率,研究了聚合温度、模板及掺杂剂、氧化剂、催化剂等因素对EDOT聚合动力学的影响。结果表明:温度越高,聚合速率越快,但导电性能变差。在以过硫酸铵为氧化剂、硫酸铁为催化剂时,两者用量越多,EDOT聚合速率越快,硫酸铁合适的用量为2‰。模板用量越多,EDOT聚合速率越慢;EDOT在以乙烯基苯磺酸钠与丙烯酸酯共聚物为模板中的聚合速率大于以聚苯乙烯磺酸钠(PSS)为模板中的聚合速率。以共聚物为模板所制得的PEDOT水分散体,其成膜性能得到明显提高。
The thin polyimide (PI) films have been widely used for the spacecraft polymeric material. However, small defects often initiate at the surface of PI films by the impingement of atomic oxygen present in the space environment such as low earth orbit Mechanical strengths of polyimide films are significantly reduced by t…
Inequalities conditions for certain new classes of univalent func- tions were determined. Also,the distortion inequalities for the the new class of univalent functions was established.
In order to incorporate silver ions into the alginate, silver-alginate was prepared with aqueous solutions of silver nitrate. In the study, the silver-alginate was prepared by blending with poly vinylpyrrolidone solutions and the electrospinning was performed by using this blend solution. Antibacterial properties of s…
A solvothermal method is reported to synthesize uniform superparamagnetic carboxyl-functionalized Fe3O4 nanoparticles with good dispersity, tunable particle size and high magnetization. The particle size of the carboxyl-func- tionalized Fe3O4 nanoparticles can be tuned from approximately 200 nm to 800 nm by simply cha…
Membrane reactors have been showing a promising future and attracted increasing attention in the scientific community as they possess advantages in terms of enhanced catalytic activity and selectivity, combination of processes (reaction and separation), simplicity in process design, and safety in operation. In particu…
В области изготовления и эксплуатации стальных сосудов и аппара-тов соответствующие нормативные документы устанавливают рядтребований к качеству сварных соединений, в том числе допуски на вели-чину и тип сварочных дефектов. Однако, как показывает практика, дале-ко не всегда наличие недопустимого дефекта в сварном шве…
The currently available computational methods for the calculation of magnetic coupling constants with density functional theory have been reviewed. These methods include modern approximations to the exchangecorrelation functional, such as hybrid, range-separated and double-hybrid functionals, as well as approaches to…
In this paper, substitution of Fe 3+ for Al 3+ in the structure of aluminosilicate and aluminogermanate nanotubes was investigated at various mole ratios of Fe/Al from the mixed Al 2O3-Fe 2O3-SiO2 (GeO 2)-H2O solution in experimental conditions of 2 mM initial concentration and 2 day aging time at 98 0 C. The synthesi…
The global cement industry has been active in reducing its emissions from cement production through energy efficiency, alternative fuels and clinker substitution. Nevertheless, greenhouse gas emissions from cement production reached 2 billion tonnes in 2011 and the International Energy Agency estimates that the cement…
【This study aimed to measure the amount of sweating on 12 parts of the upper body using absorption fabric and analyze subjective sensations. The study was conducted with 9 male subjects in climate chamber controled at $30{\pm}0.5^{\circ}C$ , and $55{\pm}5%$ RH. The result was that sweating amount of the upper back par…
Cilj ovog rada je istražiti kako različiti pristupi dvaju klasifikacijskih društava, Det \\Norske Veritas i Lloyd's Register, utječu na dimenzije strukturnih elemenata. Kroz uvod i drugo poglavlje je pobliže objašnjena sama pojava udaranja u valove (eng. slamming). U trećem poglavlju su ukratko objašnjene razlike u pr…
The eukaryotic serine racemase fromDictyoste- lium discoideum is a fold-type II pyridoxal 5 0 -phosphate (PLP)-dependent enzyme that catalyzes racemization and dehydration of both isomers of serine. In the present study, the catalytic mechanism and role of the active site residues of the enzyme were examined by site-d…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Ramakanta Naik, E. M. Vinod, C. Kumar, R. Ganesan, K. S. Sangunni; Photo induced effects in Bi/As…
Boron neutron capture therapy (BNCT) is based on selective accumulation of 10 B carriers in tumor followed by neutron irradiation. We previously proved the therapeutic success of BNCT mediated by the boron compounds boronophenylalanine and sodium decahyd- rodecaborate (GB-10) in the hamster cheek pouch oral cancer mod…
Recently, energy-saving technology is rapidly becoming a crucial issue for mankind due to the depletion of natural resources. From this perspective, every automobile manufactures are trying to develop light materials and to validate safety with environmental consideration. In this study, we developed clutch connector…
Crystalline group IV semiconductor materials are essential components in microelectronics, solar cells, and sensor applications.
利用SMT全自动回流焊机和高温恒温试验箱,制备出经2次回流焊且不同时效处理时间的Sn-Ag3.0-Cu0.5/Cu焊点试件,对其金属间化合物（IMC）的厚度进行测量,发现其厚度的增长与时效时间的平方根近似成线性关系.采用统一粘塑性Anand本构模型来描述焊点的力学性能,运用有限元计算软件ANSYS对PBGA构件进行热循环模拟,对其在不同IMC厚度下的应力和应变响应进行分析.结果表明,芯片右下方焊点右上角热循环结束后累积的等效塑性应变最大,是整个PBGA构件的关键焊点;随着IMC厚度的增加,关键焊点热循环过程中的等效应力水平不断降低,相应剪切塑性应变范围△γ不断增大,热疲劳寿命Nf则不断降低：升温和高温保温过程中剪切塑性应变的增加量…
Abstract: In this work we present cross sections for low energy positron elastic scattering by molecules methane (CH4), fluoromethane (CH3F), difluoromethane (CH2F2), trifluoromethane (CHF3), and tetrafluoromethane (CF4), for energies up to 10 eV, using two different basis set in the description of the collision proce…
Identification of the aging condition and the failure probability of oil-paper insulation in transformer is important for improving the reliability of electric power transmission system and applying life cycle cost (LCC) management to electrical equipment. Based on data obtained in a series of multi-accelerated-aging…