Materials Literature
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The piezoelectric effect in both pure lead germanate (LG) and Nd+3+K+ double doped ferroelectric lead germinate single crystals (DDLG) was studied using Keithley Programmable Electrometer. The Piezoelectric studies were done in four parts. In the first part temperature and stress dependence of pure lead germinates and…
Anti-inflammatory drugs can suppress or prevent chronic inflammation. However, uncontrolled application of anti-inflammatory drugs often impair the wound healing process. This can be overcome by combining hydrogel wound dressings with drug delivery systems to achieve stage-dependent drug release.\nThe pH of cutaneous…
The growing development of nanotechnology has resulted in an increased use of nanoparticles (NPs) in various applications ranging from medicine, military, to daily consumer products. There is a concern that NPs can be dispersed into the environment in various ways, for example to air and water during manufacture, use,…
Novel thin film solar cells exhibit unprecedented specific power, which is a key figure of merit for space applications. To get a first indication of their possible degradation in space environments, the OSCAR (‘Optical Sensors based on CARbon materials’) team has built a solar cell performance monitoring system and d…
The three-dimensional X-ray diffraction (3DXRD) is a new, advanced technique for materials characterization. This technique utilizes high-energy synchrotron X-rays to characterize the 3D crystallographic structure and strain/stress state of bulk materials. As the measurement is non-destructive, the microstructural evo…
The German nuclear waste management strategy consists of dry interim storage of spent fuel inside dual purpose casks and its subsequent direct final disposal in a deep geological repository. Interim storage is limited to 40 years so far, but will have to be extended until repository site selection and operation is con…
The purpose of this study was to investigate the effects of polymer type and composition on drug release from the matrix of diclofenac sodium sustained release tablets formulated using three different granulation methods. Ten (10) batches of diclofenac sodium tablets (F01 - F10) were prepared by melt granulation, coac…
We study the influence of axial aberrations on the degree of coherence in a scanning electron microscope. The effect of the chromatic aberration turns out to be important, especially for energies below a few keV, and this threshold depends upon geometrical parameters of the optical system.
群馬県北部に位置する林相が異なる2つの山地渓流を対象とし，粒状有機炭素（FPOC）および粒状有機窒素（FPON）について長期的に採取した．FPOCおよびFPONの濃度と流量の積から求めた輸送量（LCQ）とLQ式から求めた輸送量（LLQ）の調査期間の累積値を比較した結果，どちらの流域においても，12%~20%程度異なることが示された．このとき，LLQは，低い流量における輸送量を過小評価し，一方のLCQはサンプリングがない出水の輸送量を過小評価するため，適切なモニタリング手法の適用が重要である．ただし，どちらの手法を採用した場合であっても，年間を通じたFPOCおよびFPONの輸送量については，流量による影響が大きく，また有機物の質を表…
The investigation in this dissertation is concerned with development and applications of geometrically nonlinear triangular shell finite elements for the studies of highly geometrical nonlinear piezoelectric structures. In engineering practice, a nonlinear approach for piezoelectric shell structures is needed. This me…
In this dissertation, I present the scanning microscopy and electrical transport studies of ferroelectric thin films and ferroic/2D van der Waals heterostructures. Based on the conducting probe atomic force microscopy and piezo-response force microscopy (PFM) studies of the static and dynamic behavior of ferroelectric…
This paper studied the law of the wear resistance of tread rubber by adding different parts of the rubber material (NR, BR9000, SBR-1502), carbon black and Carbon-White. The results show that the abrasion resistance, grip and rolling resistance of the three kinds of rubber materials are slightly different. The wear re…
Tungsten trioxide (WO3) thin films were deposited by electron beam evaporation technique at an oxygen partial pressure of 2 × 10−4 mbar and at different substrate temperatures ranging from room temperature (RT) to 450°C. The films were annealed at 400°C about 2 hours and the properties were studied systematically. The…
This paper built a finite element model of the Halbach permanent magnet motor, whose accuracy was verified by comparing the output phase back-electromotive force of the model with that of the prototype motor. Keeping other parameters constant as far as possible, we investigated five variables one by one to find out th…
The adsorption of S on Cu surfaces is studied by density functional theory using both plane-wave and atomic orbital basis sets. Calculations are performed on Cu clusters of increasing sizes, and strong oscillations in the S-Cu binding energy versus cluster size are found. Although expected for small clusters, the osci…
The realistic description of plastic deformation caused by dislocations demands the representative measurement of their features, e.g., Burgers vector, slip plane, line direction and density. In the case of bulk deformation of technical alloys, reliable data must be ensured for large regions. Nonetheless, the (thin) f…
The information on the seminar "GRAFEN: MOLECULES AND 2D-CRYSTAL", which was held since 2011 in Moscow, is presented. The seminar became the basis of the first graphene conference in Russia. By now the seminar has completed its work.
Objetiva desenvolver e avaliar paineis aglomerados de fibras e de particulas lignocelulosicas do papel kraft oriundas da reciclagem de embalagens descartadas de cimento como alternativa as fibras tradicionalmente utilizadas na fabricacao do MDF e MDP. Recorreram-se a quatro tratamentos distintos, variando o teor de re…
Graphene, a two dimensional monolayer carbon sheet with the atoms tightly packed in a hexagonal lattice, has exhibited so many excellent properties, which enable graphene to break several material records with regard to carrier mobility, strength yield and thermal conductivity to name a few. Therefore, graphene has be…
Non-hydrolytic sol-gel reactions [1] are used for the synthesis of multimetallic mesoporous oxide catalysts [2], crystalline nanoparticles [3], and hybrid materials [4]. They are alternatives to classical aqueous techniques. We developed non-hydrolytic sol-gel routes based on acetamide and acetic acid ester eliminatio…