Materials Literature
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Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The structure of rapidly rotating polytropes is investigated using an approximation technique of integrating outwards from the centre and inwards from the surface, matching the two solutions at an interface. Results are presented for values of the polytropic index n = 1, 1.5, 2, 2.5, 3, 3.5, 4. The method used is an e…
Auszug Die Untersuchung bezweckte, die gemeinsamen Struktureigenschaften aller Boride und Bor-Modifikationen, die B 12 -Atomgruppen aufweisen, festzustellen. Es zeigte sich, daß die Gitterkonstanten aller dieser Strukturen aus einfachen Anordnungen der B 12 -Gruppen, die als große Metallatome angesehen werden können,…
Abstract The industrial applications of Fullers' Earth are discussed including those of the clay in its natural form, calcium montmorillonite, and after modification by acid activation or sodium exchange. Special consideration is given to uses in oil refining, foundry bonding, civil engineering, and agriculture.
Hiroshi Kato, Kaichiro Yamaguchi, Teijiro Yonezawa, Kenichi Fukui; The Electronic Structure of Some Hydrides, Halides and Alkyl Compounds of Boron and Alum
The mechanical properties of four different polyimide samples are measured. H-film, poly(N,N'-( p,p'-oxydiphenylene)pyromellitimide), shows no softening phenomena below 500°C. The three other polyimides exhibit a definite softening at elevated temperatures. All of the samples investigated show evidence of chemical rea…
The problem of the probability distribution of the observed and calculated structure factors for the general case when the latter include not only a part of the structure (P out of a total of N atoms), but also when these P atoms have finite errors Arj, is considered in this paper. This forms essentially an extension…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Faraday Rotation of Allowed Transitions: Charge-Transfer Transitions in K3Fe(CN)6P. J. StephensCite this: Inorg. Chem. 1965, 4, 12, 1690–1692Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 December 1965https://pu…
The partial pressure of oxygen in equilibrium with a niobium dioxide‐niobium pentoxide mixture was determined from electrochemical cell measurements over the range 800° to 1070°C and from thermogravimetric gas‐equilibrium measurements at 1000° and 1200°C. These measurements compare favorably with those of previous inv…
Previous investigations of frequency on fatigue strength are briefly reviewed in this paper. New resonant-type push-pull fatigue testing machines at 50 and 100 kc/s were also developed by using a ferrite magnetostrictive vibrator. By using these machines, as well as previously developed high and low-frequency push-pul…
A high-pressure furnace that operates up to 2000°C in the pressure range of 100 atm to 10−5 torr was designed and constructed to saturate UO2 powder of 4-µm average particle size with 4He. The powder was then dissolved in a fused salt in an induction chamber. The released 4He was mixed with a known quantity of 3He, an…
Luminescence spectra of Sm 3+ at a Ti 4+ site in BaTiO 3 host lattice were investigated in a wide range of temperatures including those above the Curie point. Any shifts of emission lines were not observed between -196°C and 145°C. The ferro-to-paraelectric transition is considered not to influence the strength of the…
Abstract After it had become known that three types of condensed inorganic phosphates, i.e. metaphosphates, polyphosphates, and ultraphosphates, exist, attempts were made to elucidate their formation, properties, and mutual relationships. Metaphosphates and polyphosphates containing up to eight or ten monomer units ca…
Optical absorption data are presented for Na 2 O 2 SiO 2 glass containing vanadium equilibrated in various states of oxidation. Spectra of 5 + , 4 + , and 3 + vanadium were derived. The variation in amounts of the three species is in accord with mass action considerations. The spectra are related to crystal field assi…
Phase transitions of ferroelectric NaNo 2 crystal around 164°C were studied by calorimetric and dilatometric methods. The values of both heat capacity and molar volume show an abrupt increase at about 163°C, indicating that this transition is of the first order. In the region of 164∼165°C, a small broad peak was obser…
Point defect clusters and dislocation loops produced in bulk uranium dioxide by fission damage have been observed and studied by transmission electron microscopy. Clusters 25 Å in diameter are first observed at a dose of 4.3 × 1015 fissions cm−3. With increasing dose, these clusters quickly grow into resolvable prisma…
The thermal decompositions of BaTiO(c 2 O 4 ) 2 .‐ 4H 2 O, BaTiO(OH) 2 C 2 O 4 .2H 2 O, SrTiO(C 2 O 4 ) 2 .‐ 4H 2 O, and SrTiO(OH) 2 C 2 O 4 .H 2 O were investigated using TGA, DTA, and effluent gas analysis. The stoichiometry of the decompositions is discussed and it is proposed that a reduced state of titanium is fo…
The diurnal migratory rhythm of the epipelic diatom association of freshwater streams has been investigated in laboratory studies. Movement of the diatom flora up to the surface of the sediment and down beneath the surface occurs once every 24 hours reaching a peak of cell numbers at the surface at approximately the s…
Crystal field theory developed by Abragam and Pryce has been used to formulate the anisotropic exchange interactions in CoCl 2 ·2H 2 O and CoBr 2 ·2H 2 O. These crystals are antiferromagnets in which Co ++ ions form ferromagnetic linear chains coupling antiferromagnetically to adjacent chains. There are two abrupt jum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Dispersion of Crystalline Powders of Amino Acids, Peptides, and Proteins1S. Takashima and H. P. SchwanCite this: J. Phys. Chem. 1965, 69, 12, 4176–4182Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 Decemb…