Materials Literature
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Abstract The rearranged limonoids, harperforatin (I) and haperfolide (II), and chromone harperamone (III) are isolated along with eight known compounds from the fruits and roots of Harrisonia perforata.
Shallow dislocation-related electronic states near the bottom of the conduction band in n-type Si bonded sample have been investigated with deep-level transient spectroscopy (DLTS), isothermal transient spectroscopy (ITS) and energy-resolved DLTS. The effect of thermoemission (TE) enhancement in external electric fiel…
In the presence or absence of water, a Schiff-base compound, 4-amino-3-(2-(2-hydroxybenzylidene)hydrazinyl)-1H-1,2,4-triazole-5(4H)-thione (HATT), forms different crystalline states (HATT, HATT·2H2O, and a lamellar structure, m-HATT·nH2O), which show different luminescence emission properties. Herein, we investigate t…
We present local magnetoresistance measurements on carbon nanotubes contacted with the ferromagnetic alloy Co50 Pd50. A sample with contacts of nm, m exhibited the typical sharp switching expected at the coercive fields of the contacts. However, a sample with the same in-plane geometry but a thickness of 40 nm display…
Leuchtkugeln: C60 und Y3N@C80 wurden mit der gleichen Oligo(phenylenethinylen)-Einheit verknüpft, um ihre strukturellen und photophysikalischen Eigenschaften zu vergleichen. NMR-Untersuchungen wiesen für das Y3N@C80-Derivat eine Fulleroid-Struktur aus, und beide Dyaden bildeten kolumnare Phasen mit Kern-Schale-Zylinde…
Core and core-shell quantum dots are covered with a layer of organic ligands which prevents aggregation and eliminates surface defects, thus enhancing the photophysical properties and stability of the material. These ligands are usually Lewis bases and can therefore be affected by the presence of acid in the surroundi…
Aqueous 60% solutions of maracuja oil ethoxylated with 60 mol of ethylene oxide containing hexagonal mesophases were proposed as model biocompatible safe-to-use lubricants. Tests were carried out at steady loads using a four-ball tester (Tester T-02) (1–6 kN) and a ball-on-disk tribometer (Tester T-11) (10–50 N) in or…
Nanotube diameters (d) are usually characterized using the radial breathing mode d–1; the squash mode frequency (f) however is predicted to vary as d–2. We demonstrate using the MM+ forcefield that for lengths <9 nm the symmetric squash mode (SSM) and asymmetric squash mode (ASM) ((10,0) SWNT (single wall carbon nanot…
C sf /SiC multilayer composites for thermal conductivity ( TC ) test in three directions were successively prepared by tape casting and pressureless sintering. After 1500°C/5 h oxidation treatment, short carbon fibers were oxidized which produced many pores. However, a core area, which was composed by short carbon fib…
High pressure compounds and polymorphs are investigated for a broad range of purposes such as determine structures and processes of deep planetary interiors, design materials with novel properties, understand the mechanical behavior of materials exposed to very high stresses as in explosions or impacts. Synthesis and…
A method for wear minimization through utilization of an atomic-scale functional surface structure is proposed. The basic idea is to effectively dissipate the frictional energy generated during contact sliding so that its contribution to permanent displacement of atoms is minimized. This may be achieved by using a sur…
Scale deposition is a difculty encountered with water containing ions of sparingly soluble salts, notably calcium carbonate, calcium sulfate, magnesium hydroxide, calcium phosphate, and silica. The most important single factor determining the intensity of scaling is the supersaturation (SS) level of the deposit formin…
The critical anomaly of the isobaric molar heat capacity for the liquid-liquid phase transition in binary nonionic mixtures is explained through a theory based on the general assumption that their partition function can be exactly mapped into that of the Ising three-dimensional model. Under this approximation, it is f…
ABSTRACT Atmospheric plasma treatment (APT) was used to surface‐activate graphite nanoplatelets (GnP) as well as highly graphitic P100 fibers used to manufacture composites. X‐ray photoelectron spectroscopy showed an increase in the O/C ratio of the treated surfaces when using either CO or O2 as the active gas, wherea…
The powder metallurgy allows titanium alloy production with savings of energy and time with higher microstructural homogeneity than those obtained by conventional processes. The processing of titanium alloys is increasing in industry, since these alloys presenting superior mechanical properties than commercially pure…
Twisted few layer graphene (FLG) is highly attractive from an application point of view, due to its extraordinary electronic properties. In order to study its properties, we demonstrate and discuss three different routes to in situ create and identify (twisted) FLG. Single layer graphene (SLG) sheets mechanically exfo…
The increasing demand for energy savings in cars of high production volume, especially those classified as emerging market vehicles, has led the automotive industry to focus on several strategies to achieve higher efficiency levels from their systems and components. One of the most diffuse initiatives is reducing weig…
Fouling is a general term that describes the interference of solid materials with uid ow [1]. One of its most challenging aspects is the in situ formation of inorganic salts or colloids. Severe fouling at times forces system operators to discard critical equipment components. Even if mechanical or chemical cleaning ar…
We investigate the effect of a spatially varying work function on photoemission experiments. It is demonstrated that a photoinduced work function change when probed by ultraviolet and two-photon photoemission spectroscopy can have pronounced effects on photoemission spectra. These effects are simulated by a simple mod…
Abstrak: Dasar penelitian ini adalah k arena baja tahan karat merupakan baja paduan tinggi, maka kualitas sambungan lasnya sangat dipengaruhi dan menjadi getas oleh panas dan atmosfer pengelasan. Dalam penelitian ini dilakukan pengelasan baja tahan karat AISI 304 sebagai material logam utama. Baja tahan karat AISI 304…