Materials Literature
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Interconversion reactions among the solids SiO 2 (quartz and fused), γ-AlOOH (boehmite), CsAlSiO 4 , CsAlSi 2 O 6 (pollucite), and CsAlSi 5 O 12 , in contact with aqueous solutions at 200 °C, have been investigated. Results support earlier suggestions that CsAlSi 5 O 12 is not stable with respect to CsAlSi 2 O 6 + SiO…
Fracture toughness of polycrystalline alumina and ceria partially stabilized tetragonal zirconia (CeO2-TZP) ceramics were assessed in combined mode I and mode II loading using precracked disk specimens in diametral compression. Stress states ranging from pure mode I, combined mode I and mode II, and pure mode II were…
The structural aspects of the AlCl3–SOCl2 system have been examined by vibrational spectroscopy. The SOCl2 molecule exhibits amphoteric character, i.e. it can act simultaneously as a donor through the oxygen atom and as an acceptor through the sulphur atom. The liquid state contains loosely bound, open-chain dimers/ol…
Lenses with a homogeneously aligned liquid crystal having a Fresnel structure have been prepared by using a nematic with a positive dielectric anisotropy. Their focal length can be varied continuously from the value fe for an extraordinary ray to f o for an ordinary ray by applying an electric field across the lens ce…
Japanese LWRs have experienced several troubles caused by corrosions of structural materials in the past ca. 20 years of their operational history, among which are increase in the occupational radiation exposures, intergranular stress corrosion cracking (IGSCC) of stainless steel piping in BWR, and steam generator cor…
Correlation between occupancy and temperature factors during the refinement of a disordered molecule is discussed on the basis of their effects on an atomic scattering factor curve. When the resolution of the data is limited, occupancy and temperature factors affect scattering-factor curves in a similar fashion, and t…
Although ionizable groups are known to play important roles in the assembly, catalytic, and regulatory mechanisms of Escherichia coli aspartate transcarbamylase, these groups have not been characterized in detail. We report the application of static accessibility modified Tanford-Kirkwood theory to model electrostatic…
A short survey is presented of techniques and methods used to correlate the texture with the magnetic anisotropy of various properties of soft and hard magnetic materials. Also, examples of magnetic materials are discussed with emphasis on techniques of processing which optimize the texture.
It is noted that partial discharge testing of three-core belted-type cable using single-phase test voltage may lead to large errors as compared to the actual three-phase service conditions. The method of energizing the cable and the configuration of the discharge detection circuit largely affect the magnitude of the e…
Photo-oxygenation of tetraethylpyrromethenone and of tetramethylpyrromethenone in methanol in the presence of oxygen and a porphyrin photosensitises gives the corresponding methanol–propentdyopent adducts in good yields. The photo-oxygenation reaction is shown not to be a satisfactory route to the analogous adducts wi…
The Mossbauer effect spectra of the solid solutions of Nd/sub 2/Fe/sub 14-x/Si/sub x/B, with x equal to 0.00, 0.25, 0.50, 0.75, 1.0, 1.5, and 2.0, and Y/sub 2/Fe/sub 14-x/Si/sub x/Bi, with x equal to 0.0, 1.0, 1.5, and 2.0, have been measured at 295 K. The results are most consistent with a random distribution of the…
The modem history of permanent magriots started about 1940 with the introduction of Alnico. Before this, the use of permanent magnets was limited to a few applications such as the compass and magneto. With the introduction of Alnico, it became possible to replace electromagnets with permanent magnets, and the use of m…
As one of the analytical models of the thermal stress problem for composite materials, we consider a hollow circular cylinder composed of multilayered composite laminate and discuss the transient thermal stress problems of a hollow cylinder with a uniform heat supply from the outer or inner surface. In studying the an…
The temperature dependences of the proton spin–lattice and spin–spin relaxation times, and also the second moment of the 1H n.m.r. absorptions of (CH3NH3)2SO4 and its partially deuterated analogue, have been observed in a wide temperature range, including a new high-temperature solid phase obtainable above 428 K. X-Ra…
The 119Sn chemical shifts of all ten trihalogenostannate(II) anions [SnClxBryIz]–(x+y+z= 3) are observed in diethyl ether extracts of tin(II) mixed-halide systems measured at –60°C. The tin(II) nuclear shielding order I < Br < Cl is the opposite of that found in tin(iv) halide systems. At room temperature, the tin res…
NAD-Glutamate dehydrogenase has been purified from mycelia of A. nidulans. The enzyme comprises subunits of 110 kDa. It is located in the cytosol. It is completely denatured by 1.0 M guanidine hydrochloride, and is not renatured by subsequent dilution. Isophthalate is a strong competitive inhibitor and the enzyme is a…
L’emploi de différentes techniques électrochimiques nous a permis l’obtention de couches de polythiophène avec différentes morphologies, adhérences, brillances, etc. L’emploi de courant alternatif de fréquence croissante donne lieu à des structures de plus en plus plates, adhérentes et brillantes. Le résultat est simi…
This study deals with a surface modification method in a dry powder/powder handling system. The method is a dry impact blending method which is capable of changing an interactive mixture to composite or encapsulated particles. The effect of powder properties in this method was observed in terms of SEM observations.Nyl…
Single crystals of guanidinium tetrafluoroborate of optical quality and dimensions up to 60 × 60 × 30 mm have been grown from aqueous solutions. They possess a distinct polar morphology of point symmetry group 3 m and strong pyroelectric, piezoelectric, electrooptic and nonlinear optic effects similar to those observe…
Magnetization versus temperature in the temperature interval 2-200 K was measured for amorphous alloys of three different compositions: Fe/sub 81.5/B/sub 14.5/Si/sub 4/, Fe/sub 40/Ni/sub 38/Mo/sub 4/B/sub 18/, and Co/sub 70/Fe/sub 5/Ni/sub 2/Mo/sub 3/B/sub 5/Si/sub 15/. The measurements were performed by means of a SQ…