Materials Literature
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Graphene is a two-dimensional honey-comb lattice of carbon atoms with very unusual electron energy dispersion. Since its recent micromechanical isolation and measurements, graphene attracted tremendous attention of the physics and engineering communities. In addition to the wealth of two-dimensional electron gas physi…
En general, todos los biomateriales se desarrollan para mantener un equilibrio entre sus propiedades mecanicas y la relacion bioquimica del material con los tejidos. Ambas areas son de gran importancia para que se llegue a implantar con exito el material. Sin embargo, en la mayoria (si no en todos los casos) de los im…
双Y移30°永磁同步电机（PMSM）由于其结构特点，不存在感应电机的转差频率电流。在磁场定向控制过程中，不需要对磁链进行观测．因而PMSM的磁场定向控制简单。但是磁场定向控制方法依赖于电机精确的数学模型。根据双Y移30°PMSM的数学模型。选择了一种易于实现的六相PMSM高性能电磁转矩控制的磁场定向控制方法，并对其进行仿真。基于PMSM在六相静止坐标系下的数学模型，运用坐标变换理论建立了PMSM在二相旋转坐标系下的数学模型。与六相静止坐标系相比，数学模型在两相旋转坐标系下有了很大的简化，降低了微分方程阶数。直轴电磁链和交轴磁链不再是角度的函数。在此模型下，用基于id=O的磁场定向控制方法完成对双Y移30°PMSM的解耦控制．通过仿…
Basic concepts and definitions regarding reliability, safety and failures in exploitation of welded constructions are presented in the paper. Evaluation of exploitation period and failure causes is very important for many reasons. Critical failures of some welded constructions can be catastrophically to the environmen…
Quantum chemical computations provide convenient and effective ways for molecular design using computers. In this dissertation, the molecular designs of optimal nonlinear optical (NLO) materials were investigated through three aspects. First, an inverse molecular design method was developed using a linear combination…
本研究在SBA-15分子筛孔道中制备了纳米ZnS。Zn^2＋首先通过离子交换交换到SBA-15中．通过水热法在SBA-15分子筛孔道中制备了纳米ZnS。（SBA-15）-ZnS复合物由粉末X-线衍射,傅立叶变换红外光谱，低温氮气吸附-解析附技术。固体扩散漫反射光谱以及发光研究进行了表征．粉末X-线衍射研究说明在制备主-客体纳米复合材料中分子筛骨架未被制备过程所破坏．保持完整且结晶度仍很高。傅立叶变换红外光谱表明制备的材料骨架完好。77K低温氮气吸附-解析附研究表明所制备的复合材料孔体积，孔尺寸以及表面积相对于SBA-15分子筛降低．证明客体ZnS已成功地组装入分子筛孔道中。所制备的纳米复合材料固体扩散漫反射吸收光谱相对于体相ZnS…
In solution spinning of ultra-high molecular weight polyethylene (UHMwPE), a gel is processed by an extruder through a spinneret. The extrudate is drawn through the air at high speeds and then cooled in a water bath. The end-result is a fiber with a high degree of molecular orientation and therefore exceptional tensil…
Two poly(Schiff base)s (PDBT and PDPE) were synthesized by polycondensation of 1,10-phenanthroline-5,6- dione (PD) with 2,2′-diamino-4,4′-bithiazole (DABT) and 4,4′-diaminodiphenyl ether (DAPE),respectively.The structures of the polymers were determined by FTIR and element analysis.The metal (Fe~(2+),Ni~(2+)) complexe…
精力交通和累积完成因为金属目标上的 femtosecond (fs ) 激光脱离被学习使用理论、试验性的方法。用有限差别方法， femtosecond 激光切除的铜目标上的精力交通特征的数字模拟被执行。银和铜的金属上的精力累积效果由放大 Ti 切除了：蓝宝石 femtosecond 激光系统然后试验性地被学习。模仿的结果证明电子和格子在脱离阶段有不同温度发展特征。电子温度严厉地增加并且当让格子到达最大的温度需要几千 femtoseconds 时，在几 femtoseconds 到达最大值。试验性的结果证明一致导致激光的周期的表面结构(PSS ) 能与适当搏动的数字和激光精力密度被形成。联合系数的电子声子在不同金属在 PSS 形成起…
The study was carried out to elucidate the mechanism(s) of action of the anti-inflammatory and analgesic properties of Harpagophytum procumbens (Hp; Devil's Claw). The in vitro effects of two preparations of Hp on the arachidonic acid cascade were monitored using whole blood aggregation and enzyme immunoassays for pro…
日本大昭和板紙吉永工場は，富士山の豊富な地下水と，首都圏に近い立地条件を生かし，古紙パルプ原料をメインに『都市型の資源リサイクル工場』として，洋紙・板紙を年間約660，000t生産している。抄紙機は，板紙抄紙機3台と，洋紙抄紙機2台の計5台の抄紙機を有している。今回紹介するN1m／cは，1979年に稼動し，リサイクルPPC用紙・IJフォーム用紙を抄造している。2007年1月に，サイズプレスをポンドタイプの塗工型式から，メッツォ社製のオプティサイザに改造をおこなった。本稿では，N1m／cの設備概要と，オプティサイザの現在までの操業経験について報告する。
ZusammenfassungAls Brown’sche Bewegung bezeichnet man das Herumzappeln mikroskopisch kleiner Teilchen. Dies wurde zuerst von dem Botaniker Robert Brown beobachtet, dem beim Blick durch das Mikroskop das Zucken von Pollenkörpern auf den feuchten Objektträgern auffiel. Die physikalische Ursache der Brown’schen Bewegung…
The activity of heterogeneous catalysts in refinery processes is substantially influenced by formation of coke deposits. This study expands an in-situ method for direct determination of the coke loading in fixed bed catalysts by utilizing suspension balance techniques. Here, it is investigated whether it is possible t…
Hexagonal HoMnO3 films were grown on Pt(111)//Al2O3 (0001) substrate by the laser ablating deposition method. Temperature dependence (15–300° K) of Raman spectra of hexagonal HoMnO3 film was studied. The hardening of the E2 phonon mode with decreasing temperature below the magnetic ordering temperature (TN∼75° K) mani…
O presente trabalho objetiva a investigação teórica e numérica da dinâmica dos escoamentos dos fluidos industriais. A grande maioria destes fluidos, ao escoarem apresentam um comportamento reológico bem diverso dos apresentados pelos líquidos Newtonianos - sendo, portanto, conhecidos na literatura como fluidos não-New…
Oppgaven er innenfor området beregningsfysikk/-kjemi og vil bestå i å modellere utvalgte systemer (molekyler og bulk krystaller) med relevans for den eksperimentelle aktiviteten ved Institutt for fysikk. Metodene som tas i bruk vil være basert både på klassisk mekanikk og kvantemekanikk.
Nowadays, chemistry represents a general tool for accessing (synthesis), controlling (parameters influence) and understanding (study of properties) the material. This is allowed by two possible approaches: the Top-down'; and Bottom-up';. The first approach is a key to nanotechnology. The second approach consists in as…
Anisotropy and texture plays an important role in deformation of Aluminum alloy sheets. The development of anisotropy during metal forming is a key factor as in the standard industrial use of AA-6022 as stamped automotive body enclosures where a close estimation of anisotropy can deduct costs on both machinery and inv…
Syftet med den här rapporten är att utreda vilken kopplingsart som bäst passar till en uppsamlingstransformator avsedd för vindkraftparker. Rapporten är ett första steg på vägen för att ta fram en standardtransformator åt Vattenfall Eldistribution för just den här typen av användningsområde. De kopplingar som undersök…
The results of the investigations of liquid crystalline (LC) compounds with positive dielectric anisotropy are presented. The analysis of the properties of polar mesomorphic compounds and the electrooptical and dynamic parameters of the LC compositions based upon them have shown that the polar liquid crystalline 1,3,2…