Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphological and mechanical properties of multiblock copolymersYoshinobu Isono, Hideaki Tanisugi, Keiichi Endo, Teruo Fujimoto, Hirokazu Hasegawa, Takeji Hashimoto, and Hiromichi KawaiCite this: Macromolecules 1983, 16, 1, 5–10Publication Date (Print):January 1, 1983Publica…
Comparison of the data for superplastic Pb–Sn eutectic with the existing theories on diffusion accommoda ted grain boundary sliding shows mixed agreement. In the superplastic region the observed deformation rates are about 102–103 times faster than Coble creep. In the present study, this discrepancy is resolved by a p…
The polyvinyl chloride (PVC) industry plays an important role in the total plastics industry of today. In most plastics producing countries, PVC is the leading plastic material; in others, for instance the United States and Japan, it is second only to polyethylene. The greater part of PVC is used as soft and plasticiz…
The mesitylgold(I) complex, (AuMes)5(Mes = 2,4,6-Me3C6H2), which has a five pointed star shape, was synthesized by the reaction of AuCOCl with a tetrahydrofuran solution of MesMgBr: the Au–C bond distances range from 2.12(2) to 2.20(2)Å.
Capacitive thermal-expansion, specific-heat, and electrical-resistivity measurements on single crystals of ${\mathrm{Eu}}_{3}$${\mathrm{S}}_{4}$ and ${\mathrm{La}}_{3}$${\mathrm{S}}_{4}$ have established for ${\mathrm{Eu}}_{3}$${\mathrm{S}}_{4}$ a first-order, nonstructural phase transition near ${T}_{t}=186$ K and th…
The hydroxy groups of dealuminated mordenites having SiO2/Al2O3 molar ratios 14–44 have been studied by means of infrared spectroscopy. The intensity of the low-frequency (3609 cm–1) band decreases with increasing the SiO2/Al2O3 ratio and the intensity of the high-frequency (3738 cm–1) band increases. Using pyridine a…
Etude de l'usinabilite de l'alliage martensitique Distaloys A contenant Fe-Ni 1,8-Cu 1,5-Mo 0,5 fritte. Influence d'additions de soufre, de selenium, de tellure, de MnS, de MoS 2 , de graphite sur l'usinabilite et les caracteristiques mecaniques. Etude sur l'alliage Fe-P 0,45 avec additions de graphite et de MnS ou de…
To determine the Miesowicz viscosity coefficients a shear-flow set-up has been built, which allows the measurement of η1, η2, η3 and η12. These coefficients are determined by pressing the liquid crystal through a rectangular capillary which forms part of a thermostated set-up placed between the poles of a magnet in or…
Identification of 4f binding energies of rhenium in various valencies has been attempted using X-ray photoelectron spectroscopy in conjunction with successive in situ reduction by means of argon-ion bombardment. For the first time a valency state attributable to oxidic ReIII has been identified. Ion bombardment has al…
Using the direct flexoelectric effect in an hybrid (homeotropic-planar) nematic cell, we have measured the bulk flexoelectric coefficient e* for two cyanobiphenyl compounds, 8CB and 8OCB. For 8CB, the flexo coefficient is comparable in sign and magnitude with that of MBBA, i.e. e* ∼ + 10-4 cgs. 8OCB presents an anomal…
The levels of histidine-containing protein HPr and enzyme I of the phosphoenolpyruvate-sugar phosphotransferase system of Escherichia coli strains 1100, NC3, W3110, and P650 and Salmonella typhimurium strains SB3507 and LJ144 have been determined by quantitative sugar phosphorylation assay and immunochemically. The le…
An improved method for the determination of the order parameter of a nematic liquid crystal from the anisotropy in its macroscopic physical properties is described. This method, which exploits an extrapolation technique based on the mean field theory of nematic ordering, is compared with the more conventional Haller e…
Crystal and magnetic structures of an annealed Mn–V–Al ternary alloy were investigated by powder neutron diffraction. Neutron diffraction measurements confirmed clearly that the Mn–V–Al alloy specimen with approximate composition Mn2VAl annealed at 1023 K for 48 h has the Heusler (L21)-type structure. Our studies on t…
From X-ray and DTA studies a series of phase transitions in AgNbO3 at 333K, 510K, 609K, 643K,861K has been observed. The existence of some of the phase transitions has been confirmed by domain structure investigations. e(T) and tan δ (T) variations are discussed from the point of view of the phase transitions.
The electronic and e.s.r. spectral data of the copper(II) and cobalt(II) chelates of tetra-2,3-pyridinoporphyrazine show that the electronic environment provided by the ligand is similar to that of the phthalocyanines. Potentiometric pH, spectrophotometric, and e.s.r. spectral measurements show that the water soluble…
Birth and death stochastic processes are confirmed to operate in pitting corrosion of ferritic stainless steels containing Cr, Mo, Ti and Nb. Birth process corresponds to pit generation and death process to pit repassivation, each rate being determined as a function of potential by the analysis of survival probability…
General and inorganic chemistry , General and inorganic chemistry , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Fe1−xNix alloy films obtained by the rf sputtering technique have been investigated by X-ray diffraction, magnetization and Mössbauer effect measurements. The single bcc phase extends up to about x=0.4, a bcc-fcc mixed phase appears for 0.4<x<0.5 and a single fcc phase predominates for x>0.5. The lattice constants of…
Recently new smectic phases have been discovered: the SmF and Sml phases. They appear in some coumpounds when the length of the aliphatic chains reaches a sufficient value to minimize the interlayer coupling. They are characteristic of new stages between the three-dimensionaly (3D) ordered SmB and SmG and the “2D liqu…
In order to model fluid capillarity effects, the Dutch physicist Korteweg formulated in 1901 a constitutive equation for the Cauchy stress that included density gradients. Specifically, Koretweg proposed for study a compressible fluid model in which the "elastic" or "equilibrium" portion of the Cauchy stress tensor T…