Materials Literature
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Kurzfassung Mit zunehmender Verschmutzung der Schmierstoffe nimmt die Lebensdauer von Wälzlagern ab. Die im Schmierstoff befindlichen Partikel führen in der Wälzkontaktzone zu einer lokalen Überhöhung der Flächenpressung, in deren Folge Anrisse und Pittingbildung auftreten können. Die Anrissempfindlichkeit von Kugella…
In the present study, two new methods are proposed for the polishing of silicon wafers using ultrafine-dispersed diamonds (UDDs). The first proposed polishing method uses a polishing tool with an ultrafine abrasive material made through the electrophoretic deposition of UDDs onto a brass rod. Dry polishing tests showe…
The specific features of the stabilization of suspensions formed by detonation nanodiamonds in polar and nonpolar media are investigated. It is demonstrated that the polydispersity of nanodiamond particles in an aqueous medium periodically changes in an ultrasonic field. The conditions are determined under which the o…
The review gives exhaustive coverage over the period 1876 to 2002 of the syntheses and physical and chemical properties of gem-dithiols. gem-Dithiols, poorly understood until recently, are organic sulfur compounds that contain a >C(SH)2 group.
The effects of monomer and tetrabuthylammonium hexafluorophosphate concentration on the nucleation and growth processes of polyfuran on Pt disc electrode in CH3CN have been studied through the step potential method. The j/t transients were fitted by means of a mathematical equation that considers different contributio…
NrdH-redoxins constitute a family of small redox proteins, which contain a conserved CXXC sequence motif, and are characterized by a glutaredoxin-like amino acid sequence but a thioredoxin-like activity profile. Here we report the structure of Corynebacterium ammoniagenes NrdH at 2.7 A resolution, determined by molecu…
Recent investigations on a phosphatized sediment sequence in the Cioclovina Cave led to the identification of a second occurrence in Romania (first time in the cave environment) of variscite, AlPO4·2H2O. The mineral exists as dull-white, tiny crusts and veinlets within the thick argillaceous material accumulated on th…
The dicyanamide anion, [N(CN) 2 ] - (hereafter abbreviated dca), has been shown to be a versatile building block for the assembly of coordination polymers which are components of molecular superconductors, magnets and conducting/magnetic hybrid materials. Significantly different anion topologies have been observed. We…
We propose a new optical method and the experimental set-up for measuring the anisotropic shear viscosities of nematic liquid crystals (LCs). LC shear viscosities can be optimized to improve liquid crystal display (LCD) response times, e.g. in vertical aligned nematic (VAN) or bistable nematic displays (BND). In this…
Self‐propagating high‐temperature synthesis (SHS) was applied to synthesize α‐SiAlON powders doped by RE (RE = Eu,Pr,Ce) and codoped by RE and yttrium. The results showed that the weight ratio of α‐SiAlON to (α‐SiAlON +β‐SiAlON) decreased from 70%, 55%, and 25% for europium‐, praseodymium‐, and cerium‐doped α‐SiAlON c…
The results obtained upon the electrochemical deposition of composite coatings containing ultrafine-dispersed diamonds produced by detonation synthesis are generalized. The main advantages of such coatings over the well-known composite electrochemical coatings are revealed.
Unmanned aerial vehicles or UAVs are of growing interest to military operations, but they can also be used in a variety of civilian applications such as monitoring and controlling traffic flow and search/rescue operations. John K. Borchardt reviews some of the latest composites-intensive UAV projects.
We examine the most simple and deterministic model of partial-discharge phenomena, or the three-capacitance equivalent circuit model with fixed parameter values. Although it is an old model proposed more than fifty years ago, here we show that its behaviour should be described with contemporary concepts of nonlinear d…
(TMTTF)2AsF6 and (TMTTF)2SbF6 are both known to undergo a charge ordering phase transition, though their ground states are different. The ground state of the first is Spin-Peierls, and the second is an antiferromagnet. We study the effect of pressure on the ground states and the charge-ordering using 13C NMR spectrosc…
Abstract A mild chemical reduction method was developed to synthesize selenium nanoparticles. The observation of the particle growth within a five‐minute time frame at an elevated temperature is achieved, and it was evidenced by analyzing the particle sizes from electron micrographs. The samples at individual growth s…
To decrease light reflection from the surface of cathode-ray tube (CRT) and liquid crystal display (LCD), anti reflection (AR) technology has been investigated. In this work, we demonstrate the use of high-quality two-layer AR films (luminous reflection under 1.0) using numerous micropores to create a low-refractive-i…
Colloidal silica (SiO2) is perhaps the most undesirable inorganic deposit formed in process cooling waters, especially on metallic surfaces such as heat exchangers or pipelines. Conventional mineral scale inhibitors do not inhibit its formation. Chemical cleaning is difficult and not free of hazards. Research on silic…
To confirm the applicability of thermally induced ultrasonic emission from nanocrystalline silicon (nc-Si) devices as radiation pressure generators, the dynamic response has been investigated under a pulse operation mode. The nc-Si emitter is fabricated on a p-type Si wafer by conventional electrochemical anodization…
Abstract Polarized Raman and IR spectra were obtained for Ca 4 GdO(BO 3 ) 3 crystal at ambient temperature. The assignment of the observed bands to the respective internal and external phonons is proposed on the basis of lattice dynamics calculations. This study also shows that significant LO–TO splitting exists for s…
The Taguchi design of experiments was used to test the relative importance of medium components and environmental factors on poly(β-hydroxybutyrate)(PHB) production by Ralstonia eutropha. The optimum condition was obtained as: fructose concentration, 15 g/L; C/N ratio, 7.4; agitation speed 200 rpm; culture time, 40 h;…