Materials Literature
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Oxygen vacancy formation at the (110), (100), (001), and (101) surfaces of rutile TiO 2 has been investigated using density functional theory with an on-site correction for strongly correlated systems (DFT + U ). In agreement with experimental data, the reduced (110) surface shows an occupied defect state 0.7 eV below…
We have studied EuFe2(As0.7P0.3)(2) by the measurements of x-ray diffraction, electrical resistivity, thermopower, magnetic susceptibility, magnetoresistance, and specific heat. Partial substitution of As with P results in the shrinkage of lattice, which generates chemical pressure to the system. It is found that EuFe…
Steady state shear flow of different types of cellulose (microcrystalline, spruce sulfite and bacterial) dissolved in 1-ethyl-3-methylimidazolium acetate was studied in a large range of concentrations (0-15%) and temperatures (0-100 degrees C). Newtonian flow was recorded for all experimental conditions; these viscosi…
A novel hybrid material prepared from graphene and poly (3,4-ethyldioxythiophene) (PEDOT) shows excellent transparency, electrical conductivity, and good flexibility, together with high thermal stability and is easily processed in both water and organic solvents. Conductivities of the order of 0.2 S/cm and light trans…
Twelve methods of determining energy band gap (E(g)) of semiconductors using diffuse reflectance spectroscopy have been applied in investigations of sonochemically produced antimony sulfoiodide (SbSI) consisting of nanowires. It has been proved that the best method of determining E(g) is based on simultaneous fitting…
Abstract Nitrogen‐enriched nonporous carbon materials derived from melamine–mica composites are subjected to ammonia treatment to further increase the nitrogen content. For samples preoxidized prior to the ammonia treatment, the nitrogen content is doubled and is mainly incorporated in pyrrol‐like groups. The material…
Biodegradable materials are used in packaging, agriculture, medicine and other areas. In recent years there has been an increase in interest in biodegradable polymers. Two classes of biodegradable polymers can be distinguished: synthetic or natural polymers. There are polymers produced from feedstocks derived either f…
We study the large enhancement of thermoelectric power ( S ) at low temperatures of a batch of conducting amorphous carbon (a-CN x ) thin films containing high concentrations of nitrogen (nitrogen atomic fraction x = 15–23) as well as the anomalous variation of the sign of S with x . A transport model is proposed to e…
Abstract Coiled tubing (CT) is routinely exposed to different concentrations of acid in stimulation and cleanout jobs. Routine maintenance measures are generally taken, such as the use of inhibitors and proper cleanup and storage practices. However, a large number of CT strings suffer from corrosion and corrosion-fati…
본 연구에서는 ZnO 박막을 성장하기 위한 plasma-assisted molecular beam epitaxy (PAMBE)에 장착된 플라즈마건에 13.56 MHz의 rf 전력을 인가하였을 때 발생되는 산소 플라즈마의 발광 스펙트럼을 광발광 분광기(optical emission spectroscopy: OES)를 이용하여 조사하였다. 실험은 산소 가스 유량을 1 sccm에서 20 sccm, rf 전력을 25W에서 250 W 범위에서 플라즈마건의 오리피스의 직경을 각각 3 mm 와 5 mm로 달리하여 행해졌다. 산소 플라즈마를 발생시켰을 때 오리피스의 직경에 상관없…
Die Wasserstoffdesorption wird durch Zugabe von KH zu Mg(NH2)2/LiH drastisch beschleunigt. Die Abgabe von Wasserstoff aus dem Kalium-modifizierten System setzt bei ca. 80 °C ein (siehe Graph). Etwa 5 Gew.-% Wasserstoff können bei ca. 107 °C umkehrbar de- und absorbiert werden. Die Gegenwart von Kalium im reagierenden…
Male Sprague-Dawley rats were treated 10 times either with 2 or 10 mg/kg s.c. prednisolone acetate or with 300 or 1,000 mg/kg p.o. D-penicillamine or with 100 or 300 mg/kg p.o. aminoacetonitrile bisulfate. Samples of dorsal skin were tested either longitudinally or perpendicularly to the body axis. Relaxation and hyst…
The theory for inductive and capacitive elements realized from anisotropic slabs is developed. These elements are shown to have low sensitivity to angle of incidence and nondispersive performance. It is therefore possible to realize optical circuits that perform more effectively than would be possible with isotropic m…
The plane-wave pseudopotential method using the generalized gradient approximation within the framework of density functional theory is applied to analyse the lattice parameters, elastic constants, bulk moduli, shear moduli and Young's moduli of WSi2. The quasi-harmonic Debye model, using a set of total energy versus…
Abstract BACKGROUND: Reverse flow reactors are widely used for the treatment of gaseous emissions containing different hydrocarbons. However, most of the reported studies are focused on the combustion of a given hydrocarbon over a given catalyst. Consequently, any conclusions are difficult to extrapolate to other syst…
Carbon-nanotube (CNT) cathode has promising applications in high-frequency electron and display devices due to its good field-emission performance. The field-emission performance of CNTs with a pulse driving mode is studied both by theoretical analysis and experiments. The impulse responses of a field-emission diode w…
Abstract Am Scheideweg : Ein einzigartiges kohlenstoffüberbrücktes Annulenmotiv – das Dehydroquatyrin – ist Teil der Molekülstruktur des Tetraazuliporphyrintetrakations (siehe Bild). Der Makrocyclus, der sich an der Schnittstelle zwischen Annulen‐, Carbokationen‐ und Porphyrinchemie befindet, wird durch Kondensation v…
This paper considers a free boundary problem that describes the motion of contact lines of a liquid droplet on a flat surface. The elliptic nature of the equation for droplet shape and the monotonic dependence of contact line velocity on contact angle allows us to introduce a notion of “viscosity” solutions for this p…
Molecular crystals of an As 4 S 4-x Se x (0 ≤ x ≤ 4) solid solution were grown at 400 °C using vacuumsublimation and were characterized using single-crystal X-ray diffraction and electron microprobe analyses. The solid solution crystallizes in the monoclinic space group P2 1 /n with lattice parameters of a = 9.33-9.57…
First principles calculations have been used to investigate the structural, electronic, thermodynamic and optical properties of boron ternary alloy BAs 1 - x P x , using a hybrid full-potential (linear) augmented plane wave plus the local orbitals (APW + lo) method within the density-functional theory (DFT). The Perde…