Materials Literature
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This paper describes an approach to the design of brushless dc motors considering cogging torque reduction and running torque optimization to enhance the product robustness. The approach is based on the Taguchi method and utilizes the orthogonal array for design of ''experiments', i.e. the scheme for numerical simulat…
A new anion exchange method of intercalation in layered double hydroxides (LDHs), based on the formation and organic phase extraction of a salt between dodecylsulfate anions and a cationic surfactant (CTA), is described which is shown to be a very fast and efficient way to obtain a wide variety of LDH-intercalated org…
The interest in SF/sub 6/ gas mixtures has been re-ignited in recent years by the issue of the greenhouse effect of the SF/sub 6/ gas, and most research work is now focused on a SF/sub 6//N/sub 2/ gas mixture, which is suitable for application in electrical apparatus with slightly non-uniform fields. This paper presen…
The properties of monomeric and dimeric thiacarbocyanine (1) and three derivatives with methyl (2) and ethyl (3 and 4) meso-substituents were studied in aqueous solution by time-resolved and steady-state spectroscopic methods. Dimerization is characterized by a blue-shifted band at 512–536 nm, a high association const…
A suitable relationship between oxide ion polarizability, cation polarizability, optical basicity and O1s binding energy in XPS spectra has been searched on the basis of experimental and calculated data reported in the literature for numerous simple oxides. It has been established that O1s binding energy decreases wit…
Two titanium-oxo clusters, [Ti3O(OPri)7(O3C9H15)] 1 and [Ti11O13(OPri)18] 2, have been obtained through the reactions of Ti(OPri)4 with ketones such as acetone, acetylacetone and diacetone alcohol. Complex 1 is composed of a trinuclear unit that is capped by a tridentate enolate ligand synthesized insitu. Complex 2 is…
A two-dimensional anisotropic nonlinear evolution equation is derived to model the formation of facets and corners in the course of kinetically controlled crystal growth. The equation is solved numerically in particular cases corresponding to the faceting of [001], [111], and [110] growing crystal surfaces, and the fo…
A microsieve with a very uniform pore size of 260 nm and a pore to pore spacing of 510 nm has been fabricated using multiple exposure interference lithography and (silicon) micro-machining technology. The sieve consists of a 0.1 µm thick silicon nitride membrane perforated with sub-micron diameter pores and a macro pe…
The dependence of the Raman line width in diamonds on the nitrogen impurity is experimentally studied. A linear relation between the nitrogen content and the width is found. It is demonstrated that the slope of the linear fit depends on the type of nitrogen defect. A relation between the Raman experiment and results f…
Orange and red phosphorescence from was clearly observed after exciting with ultraviolet (UV) light. The phosphorescence properties for were investigated with a fluorescence photometer. The phosphorescence was due to to and to transitions of ions and it lasted more than . It is suggested that trapped‐electron and hole…
The selection of the armour materials for the Plasma Facing Components (PFCs) of the International Thermonuclear Experimental Reactor (ITER) is a trade-off between multiple requirements derived from the unique features of a burning fusion plasma environment. The factors that affect the selection come primarily from th…
The reaction of Nd2S2O, TiS2 and S at 1000 °C and subsequent chemical transport with I2 yields the new crystalline layered oxysulfide Nd2Ti2S2O5 that possesses a defective Sr3Ti2O7 structure whose cuboctahedral sites within the double-perovskite layers are empty; Nd2Ti2S2O5 is paramagnetic and semiconducting; the synt…
A series of derivatives M 2 P 2 ( M 2 ≡ H 4 , Co 2 , Ni 2 , Cu 2 , Zn 2 , Pd 2 , Pt 2 , Co / Ni , Ni / Cu , Ni / Zn ) of the ligand meso,meso′-bis(octaethylporphyrinyl)butadiyne has been prepared and characterized by 1 H NMR, FT Raman and visible absorption spectroscopies as well as by cyclic and a.c. voltammetry in C…
We consider the following generalization of strongly regular graphs. A graph G is a Deza graph if it is regular and the number of common neighbors of two distinct vertices takes on one of two values (not necessarily depending on the adjacency of the two vertices). We introduce several ways to construct Deza graphs, an…
Copper zinc oxide catalysts are effective for the ambient temperature carbon monoxide oxidation and display higher specific activity than the current commercial hopcalite catalyst.
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High performance Sm/sub 2/Fe/sub 17/N/sub 3/ magnet powder is developed by a reduction and diffusion method. Typical remanence, coercivity and maximum energy product obtained are 1.40 T, 1.13 T and 323 kJ/m/sup 3/, respectively. Decreasing samarium content, oxygen content and the amount of /spl alpha/-Fe are found to…
The viability of applying UHF partial discharge monitoring techniques to an in-service oil-filled power transformer is established. Discharges in oil are shown to radiate the high frequency signals necessary to allow detection. On-site pulse injection is used to test the operation of a UHF coupler fitted to the transf…
The reactions of PhP(O)(OH)2 or Ph2P(O)OH with Ti(OPri)4 in DMSO give the soluble tetranuclear complexes [Ti4(µ3-O)(OPri)5(µ-OPri)3(PhPO3)3]·DMSO 1 or [Ti(µ3-O)(OPri)(Ph2PO2)]4·0.5DMSO 2, the first examples of phosphonato- and phosphinato-bridged titanium oxo alkoxides, which have been characterised by single-crystal…
Applied to the new iron(II) compound Fe(t-msbpy)2(NCS)2 (t-msbpy=4-methyl-4′-trans-styryl-2,2′-bipyridine), a novel strategy based on the so-called '‘ligand-driven light-induced spin change’' (or LD-LISC) effect, which consists in triggering the metal ion electronic spin-state crossover in a complex by a photochemical…