《常用电子元器件系列讲座》——第四讲 电感器
正如一座巍峨的大厦是建立于无数砖瓦之上,电子电路则是由各种各样、形形色色的电子元器件构成,全面了解、正确地应用这些元器件,是保证电子电路性能的基础。本系列讲座将介绍电阻器、电容器、电感器、变压器、晶体管、继电器、光电耦合器、显示器等常用电子元器件的性能及应用知识。
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Modelación micromecánica de polímeros reforzados con partículas Micromechanical modeling of particle reinforced polymers
This work describes an easy to use constitutive model able to predict the mechanical behavior of polymer matrix particulate composites at temperatures above the glass transition temperature Tg. This model was based on both phenomenological and micromechanical theories. With the model proposed it is possible to obtain…
The relationship between IHα/(I*SiH)2 and crystalline volume fraction in microcrystalline silicon growth
Oprical-emission-intensity ratio of I Hα /(I SiH ) during film growth has been used as a simple indicator to predict crystallinity (crystal-volume fraction: X C ) in the resulting microcrystalline silicon (μc-Si:H) thin films. The relationship between I Hα /(I* SiH ) and X C has been checked under a wide variety of fi…
Coextrusion des polymères : instabilités d’interface
Dans cet article sont mises en avant les instabilités d'interface dans le procédé de coextrusion des polymères. Cette instabilité est de nature convective, c'est-à-dire que les petites perturbations dans l'écoulement sont amplifiées et transportées dans la direction d'écoulement. Une modélisation par stabilité linéair…
Nuovi materiali per il trattamento di reflui dell’industria tessile: le fibre di carbone attivato
Activated Carbon Fibers (ACF) can adsorb a wide range of organic contaminants and may be also used to treat air, drinking waters and wastewater. Within ENEA, ACF have been applied to the treatment of wastewater coming from textile industries
RADIO PHENOMENA IN SOLIDS AND PLASMA Nonlinear Dynamics of the Magnetization in a Ferrite Plate with Magnetoelastic Properties Under the Conditions for Orientational Transition
The nonlinear dynamics of the orientational phase transition of the magnetization vector in a magnetoelastic medium is analyzed. It is demonstrated that the transition involves the precession of the mag� netization vector accompanied by the elastic oscillations at the same frequency. The critical constants of mag� net…
The Berg:都会中的雪山
当大部分城市都以光怪陆离的建筑物作为地标及象征时,德国设计师Jakob Tigges却提出要在柏林兴建高山,作为首都新的旅游点,而选址就在2008年10月起停用的Tempelhof机场。Tempelhof机场于1927首次启用,是欧洲三大建于二次世界大战前的机场之一,曾是欧洲的交通枢纽,也被希特勒视为德国权威
Mulitizaçãoemrefratáriosutilizandodiferentesfontes precursoras-revisão (Refractories mullitization with different sources of reactants - review)
Mullite is a ceramic phase currently applied in the refractory industries due to its excellent properties, high refractoriness and it is formed by the reaction of silica and alumina at elevated temperatures. In the literature, many works analyze its synthesis and reactions, as well as the in-situ formation or addition…
Metastable State of Clindamycin Phosphate in Cooling Crystallization
亚稳的状态和在使结晶化凉下来的 clindamycin 磷酸盐(CP ) 的成核动力学被亚稳的地区宽度(MZW ) 学习方法和正式就职时间方法。由相关有温度，焦虑率和冷却的率的 MZW 试验性的结果，关联结果与 MZW 的变化趋势显示出好同意，这被发现。批评成核参数基于成核的古典理论被评估；界面的紧张和批评原子核的半径与相对过度饱和的减少增加了。成核率上的过度饱和的效果被分析。CP 的新阶段形成被 mononuclear 机制管理，这被显示。
THE INFLUENCE OF STORAGE ON BAMBOO PULPS AND PAPER QUALITY
This study presents research dealing with the way in which storage affects bamboo pulp fibres and the quality of the resulting paper. Two bamboo pulps, cooked to different kappa numbers and then ECF-bleached to similar levels of ISO-brightness, were used to examine the relationship between refining, storage, pulp/fibr…
Materials Analysis Using Synchrotron Radiation and Neutron Beams
To develop high-performance and high-reliability products that do not contain any hazardous substances, Fujitsu uses many analysis techniques and various types of equipment. To add to these, we have been developing materials analysis techniques using synchrotron radiation and neutron beams, which cannot easily be hand…
Populärkultur und Wissenschaft: Spiel ohne Grenzen? Symptomatische Diskurslektüren zu Nanotechnologie und Sciencefiction
Am Anfang der Etablierung neuer naturwissenschaftlich-technischer Gebiete stehen vielfältige Versprechungen zu deren zukünftigen Möglichkeiten, die von einem erweiterten Verständnis der Natur über potenzielle technologische Anwendungen bis hin zur Veränderung des Selbstverständnisses des Menschen reichen. Diese Szenar…
CaO含量对CABS/Al2O3复相玻璃-陶瓷性能的影响
通过XRD、SEM等测试手段,研究了钙铝硼硅/氧化铝系玻璃-陶瓷一个典型组成的致密化过程,并讨论了在这过程中物相、微观结构以及介电性能的变化规律。结果表明,CaO对烧结有一定的促进作用。在添加11.5%wt CaO在725℃烧结保温0.5h,玻璃试样性能为,er=6.19,tanδ=0.0029。复相玻璃陶瓷样品中随着CaO含量增加,玻璃的析晶倾向增大;当CaO含量为17%时,有钙长石析出,样品介电性能下降。
Структурно-феноменологические модели прогнозирования упругих свойств высокопористых композитов
Structural-phenomenological approach for predicting of the elastic properties for high-pore composites is used. Nonlinear local-ergodic models for the elastic properties predicting are proposed. They give us narrower Voigt-Reiss results, than calculations for the linear models. Analytical solution for calculation of t…
Synthesis of Porous ZnO Nanosheets and Study of Its Photoluminescence Properties
porous ZnO nanosheets with wurtzite structure is produced by the thermal treatment of ZnS(en)0.5 (en = ethylenediamine) complex precursor, wiich is combined through solvothermal method with the mate- rials of ZnCl, CS(NH2)2, and ethylenediamine, to 600 in air. ℃ The PL spectra shows that the emission peak at 545 nm is…
Magnetic Properties of Melt-Spun Pr-Fe-Co-Ti-B Ribbons with Low Coercivity
This research aimed at the development of the rotor material for torque limiter. The coercivity of the rotor material is required to be around 80 kA/m. The melt-spun ribbons of Pr-Fe-Co-Ti-B system alloys were prepared by single roller liquid-quenching method. The effect of composition, wheel velocity and heat treatme…
偏高岭土水热合成高硅SAPO-5分子筛(英文)
以具有一定活性的偏高岭土兼作铝源与硅源、正磷酸作磷源、三乙醇胺和十六烷基三甲基溴化铵为复合模板剂,于473K水热反应16h合成了高硅SAPO-5分子筛。利用X射线衍射、Fourier变换红外光谱、扫描电镜、29Si,27Al固态核磁共振和能谱分析等手段对产物结构进行了表征。结果表明:采用十六烷基三甲基溴化铵复合三乙醇胺作模板剂,可以促进SAPO-5晶体产物的形成。在473K下,晶化时间为16h时,可得到结晶度较高的SAPO-5晶体,其形貌为尺寸大约为20μm×5μm×5μm的规则柱状晶体,结构中Si与Al的摩尔比为0.55,在间二甲苯异构化反应中具有较高的催化活性。
Экспериментальные исследования свойств древесины, вызывающих сушильные напряжения
Galkin. V.P. EXPERIMENTAL SEARCHING OF WOOD PROPERTIES THAT AROUSE DRYING TENSION. Scheme of experimental installation for estimating of coefficients elasticity and tensile strengths of wood, non-strength humidity deformations, deformations of constraint shrinkage, deformability of wood during stressing at regulated m…
COMBUSTION OF METHANE, HYDROGEN, CO AND THE SYNTHESIS GAS OVER Ag-DOPED PEROVSKITE CATALYSTS
Perovskites are promising candidates for use in catalytic combustion applications. In the present study, La(1-x)Ag(x)MnO(3) (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by the citrate method and characterized by X-ray diffraction (XRD) and specific surface area (SSA) measurement. The activity was tested in a fixed bed qu…
Polymer media for holographic data storage
The ability of holographic data storage to record data in the volume of the media makes it one \nof the most promising technologies to replace current generation storage. It can store more \nthan 1 Terabyte per disk with data transfer rates of up to 10 Gigabit per second. Dynamic \nrange, which is determined by the re…