Materials Literature
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機械的エネルギーの有効利用と無機微粉体の表面改質の双方の見地から, メカノケミカル重合反応を利用した微粉体の表面改質法について検討した.メカノケミカル重合反応は, 窒素雰囲気下メタクリル酸メチル溶媒中で石英を粉砕することで行った.用いた粉砕機は振動ボールミルで, ミル容器およびボールは窒化ケイ素製である.実験は, 窒素雰囲気下で石英の濃度を変化させて行い, 石英の比表面積とポリマー転化率の経時変化を調査した.その結果, 重合反応は粉砕性と密接に関係し, ポリマー転化率は石英の生成全表面積におおよそ比例すること, わずかのポリマー量で石英表面は十分に疎水性に表面改質されることなどが明らかになった.本法は, 他の無機物固体についても適…
Two commercial PET yarns, one as-spun and the other highly crystalline and drawn, were annealed at l8°C under various conditions. Mechanical and thermal-response measurements were made under high transient-heating conditions by using a UMIST-built Universal Fibre Tester (UFT). Differential-scanning-calorimetry (DSC) m…
The structures of (K½Na½)TiOPO4 and (Rb½Na½)TiOPO4 have been determined from Rietveld analysis of powder diffraction data, the former from a joint analysis of time-of-flight neutron and X-ray data, the latter from constant wavelength neutron data: Pn21a, (K½Na½)TiOPO4a= 12.75613(7)Å, b= 10.60426(6)Å, c= 6.31869(4)Å; (…
Calcareous nannofossils from Man Aike Formation are described and illustrated from SEC-7 well, located near Cardiel Lake, Santa Cruz Province, Argentina. The nannoflora contains Neococcolithes dubius, Zigrhablithus bijugatus, Reticulofenestra umbilica, R. dictyoda, Braarudosphaera bigelowi, Transversopontis pulcher, T…
We systematize available thermodynamic information on transition metal diborides, with emphasis on the enthalpy of formation, the vibrational entropy and the melting temperature. When experimental information is lacking, e.g., for metastable compounds, we obtain estimates through interpolation and extrapolation proced…
Thermal conductivities of dense pure hematite, magnetite, wustite and iron have been measured by the laser flash method in the temperature range from room temperature to 1 553 K. The relatively high thermal conductivities of dense pure hematite, magnetite and wustite at low temperature were found and these values decr…
The addition of titanium to standard 625 grade enhances the age-hardening response, enabling yield strengths greater than 800 MPa to be obtained by simple, industrially compatible, heat treatments. The effect of such treatments on microstructure have been studied, together with their influence on the strength/toughnes…
Effects of neutron irradiation and iodine as a corrosive fission product on the fatigue behavior of Zircaloy-2 fuel cladding tubes were investigated using two different types of test specimens in order to evaluate the fatigue strength of BWR fuel subjected to such variable loading conditions as load following or autom…
A factorial-analysis technique is applied to study the effects of strand spacing, twist, and spindle speed on the hairiness of double-rove yarn. A wide range of twist levels and spindle speeds is covered by spinning yarns from two different types of fibres, namely, cotton and a polyester-fibre/cotton blend, in order t…
2014 La matrice de carbure de silicium des composites SiC/SiC a t examine d'un point de vue chimique et structural par spectroscopie de pertes d'nergie d'lectrons (EELS) et par microsco- pie lectronique haute rsolution (MEHR). La croissance colonnaire des cristaux de la matrice et leur distribution radiale par rapport…
The literature of the past two decades suggests that confusion persists concerning the role of director fluctuations in the theory of nematics. Are these fluctuations necessarily small? If so, the fluctuation spectrum must terminate at a wavevector q c which is of the order of 109 m−1, yet fluctuation modes with wavev…
The i. r. spectra of benzimidazol-2-thione have been measured from 4000 to 180 cm−1; polarized spectra of single crystals have been also obtained. The Raman spectra of polycrystalline samples and solutions have been recorded and the polarization of many lines has been determined. Most vibrations have been assigned on…
High specific thermal conductivity (thermal conductivity divided by density) is a major design criterion for minimizing system mass for space power systems. For nuclear source power systems, graphite fiber reinforced copper matrix (Gr/Cu) composites offer good potential as a radiator fin material operating at service…
This report will present the results of a study on the effects of stress volume on the tensile strength of two nuclear-grade graphites. The materials selected were H-451, an extruded near-isotropic graphite manufactured by Great Lakes Carbon Corporation, and IG-110, a fine-grained isotropic molded graphite manufacture…
Article Crystal structure of hexapotassium di-μ-selenido-bis(diselenidogallate), K6Ga2Se6 was published on January 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 197, issue 1-2).
Effects of various kinds of rare earth oxides (Y2O3, Er2O3, Sm2O3, La2O3 and CeO2) addition on the sintering of mullite and the precipitation behavior of secondary phases in the mullite sintered bodies were investigated. The sintering of the mullite compacts, to which a small amount of these rare earth oxides was adde…
An investigation was made to determine the relevance of impacter shape to nonvisible damage and tensile residual strength of graphite/epoxy cases for the solid rocket motors of the Space Shuttle. Impacters were dropped onto 30.5-cm (12-in.)-long rings (short cylinders) that were 76.2 cm (30 in.) in diameter and 36 mm…
The local structure of interlayer lanthanide ions ion-exchanged into vermiculite clay has been determined as a function of the nature of the lanthanide ion and of the physical form of the sample (powders and oriented films) using X-ray absorption spectroscopy. Water molecules form the first coordination shell, with me…
Gadolinium(III) complexes of citric (3-carboxy-3-hydroxypentane-1,5-dioic) and 3-carboxypentane-1,5-dioic acid have been studied potentiometrically at 25°C and an ionic strength of 0.15 mol dm–3 NaCl. Both [GdL](H3L = citric acid) and [GdL(OH)]– were detected. From potentiometric and spectroscopic evidence citrate is…
In pharmaceutical studies it is often necessary to dissolve a slightly polar drug in a mixture of water and one or more cosolvents, such as ethanol, glycerol, and propylene glycol, to increase the drug's solubility. It is also of interest to know whether a maximum in the solubility profile of the drug exists in the mi…