Materials Literature
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Fine-particle rare-earth-metal zirconates, Ln2Zr2O7, where Ln = La, Ce, Pr, Nd, Sm, Gd and Dy having the pyrochlore structure have been prepared using a novel combustion process. The process employs aqueous solutions of the corresponding rare-earth-metal nitrate, zirconium nitrate and carbohydrazide/urea in the requir…
Surface models of monoclinic and tetragonal zirconia are presented. They are derived from the respective lattice structures of both modifications. In contrast to previous investigations structural deviations of both phases from the ideal CaF2 structure are taken into account. The existence of trigonally and tetrahedra…
The accelerated synthesis of regular dendritic poly (ether-urethane) macromolecules through growth of two generations in a single synthetic operation has been explored. This procedure requires the use of two AB2 monomers such as 3,5-diisocyanatobenzyl chloride and 3.5-dihydroxybenzyl alcohol that can react pairwise in…
Mathematical equations are derived for the transient electric field in insulation media with permittivity and resistivity during boundary excitation due to changing from one steady state to another, such as a polarity reversal voltage imposed on the insulation of HVDC apparatus. The equations are solved by the finite…
Cobalt(II) phthatocyaninetetrasulfonate [Co(pcts)]4– intercalated into a MgsAl2.5-layered double hydroxide (LDH) sxhibited greatly enhanced catalytic stability compared to the homogeneous catalyst for the autoxidation of 2,6-di-tert-butylphenol to the corresponding diphenoquine at 35 ± 2 °C; under homogeneous reaction…
Efforts to improve the wear properties of sintered high speed steels have made use of the simultaneous addition of hard ceramic particles (TiC or NbC) alongside particles which might act as a solid lubricant (MnS or CaF 2 ). Preliminary investigations carried out to study interactions between such particles and a sint…
The transition of Fe2+ to Fe3+ in Fricke solution after irradiation results in a change of NMR proton relaxation times in agarose gels which can be used for the dosimetry of ionizing radiation. The main advantage of this system is the possibility of observing dose distributions in 3 dimensions in a medium which is sup…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and degradation of commercial poly(vinyl chloride) obtained at different temperaturesMikael Rogestedt and Thomas HjertbergCite this: Macromolecules 1993, 26, 1, 60–64Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published ini…
Powder compacts of alkoxide‐derived fine silica powders were consolidated into a highly dense and uniform structure by ultra‐high‐pressure cold isostatic pressing of granules with controlled structure. The diameters of spherical and nearly monosized amorphous silica particles, prepared from metal alkoxide, were succes…
The pulse height distribution (PHD) functions of partial discharges (PDs) generated by AC voltage in air are investigated. The electrode systems used allow the investigation of single-source PDs and/or multiple-source discharges. Because voltage and the electrode configuration alter the PHD functions of even a single…
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Abstract Trichloroethylene, tetrachloroethylene, 1,1,1-trichloroethane, chloroform and carbon tetrachloride in dilute aqueous solutions were rapidly decomposed to chloride anions, hydrogen, carbon monoxide and carbon dioxide by ultrasonic irradiation.
Magnetic materials capable of producing strains greater than 10 -3 have received con siderable attention over the last few years. This is partly due to recent interest in fields such as de formable surfaces, active vibration control, and precision machining, where large forces and small displacements are required, and…
Four types of transparent electrically conductive filters commonly used for a variety of applications are (1) a free-standing conducting inductive mesh, (2) a substrate coated with a conducting inductive mesh, (3) a conducting substrate, and (4) a substrate coated with a continuous conducting coating. Each can be desi…
In order to search for a chitosan with low crystallinity, partially N-deacetylated chitins (PDC) and partially N-acetylated chitosans (PAC) with a low degree of N-acetylation (DAc) were examined by X-ray powder diffraction measurements. Three PDC samples, having less than 30% DAc and prepared by solid-state deacetylat…
A stress analysis was carried out in order to determine the local stress distribution around spherical particles in particulate filled composites. The results were introduced into the criteria for micromechanical deformations and the conditions for the initiation of each mechanism were calculated. Results of the calcu…
The paraelectric and ferroelectric phases of betaine phosphite [BPI: (CH3)3 NCH2COO H3PO3] single crystals have been studied. The structure of BPI was determined at room temperature using x-ray and elastic neutron diffraction. Details of the ferroelectric transition and various low temperature properties were investig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn upgrading process through cavitation and surfactantJiunn Ren Lin and Teh Fu YenCite this: Energy Fuels 1993, 7, 1, 111–118Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.org/doi/10.1021…
高力ボルトの高強度化の必要性は大きいのであるが,その遅れ破壊はいまだ理論的な解明がなされておらず,その必要十分な予測ができない現状にある。そのために,実験室的に耐遅れ破壊特性の優れた高強度高力ボルトであっても,容易に実用化できない。本研究は,この課題解決のために行ったもので,得た結論の要点は以下のものである。鋼中の微量水素の定量化を可能にし,試験片中の水素量とその遅れ破壊との関連を求め,一定の応力状態(P/Pf=一定)では各鋼材固有の限界水素量HTが存在することを確かめた。この試験で求められる対象鋼材の限界水素量HTは,別途水素モニターによる対象鋼材の使用環境における侵入水素量あるいは侵入の容易さを知ることによって,対象鋼材の実環…
A critical study of the performance of several digital filters for rejecting discrete spectral interference (DSI) in partial-discharge (PD) testing is reported. The filters are evaluated with particular reference to distortion introduced on successive PD pulses. A digital filtering method based on a cascaded second-or…