Materials Literature
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Paramagnetic resonance is detected for $^{172}\mathrm{Yb}^{3+}$ ions diluted in crystals of Y${({\mathrm{C}}_{2}{\mathrm{H}}_{5}\mathrm{S}{\mathrm{O}}_{4})}_{3}$ \ifmmode\cdot\else\textperiodcentered\fi{} 9${\mathrm{H}}_{2}$O at temperatures $1.2\ensuremath{\leqq}T\ensuremath{\leqq}4.2$ \ifmmode^\circ\else\textdegree\…
The effect of impurities on the color of dense flint glass was investigated by comparing the optical absorption caused by cations in Na 2 O·3SiO 2 ·2PbO glass, in Na 2 O·3SiO 2 ·2PbO:1 wt% Sb 2 O 3 glass, and in Na 2 O·3SiO 2 glass; all three are colorless when of high purity. Of 11 colorants, only vanadium colored bo…
Abstract Several new amide—imide polymers of good thermal stability have been synthesized by the reaction in solution of diacid chlorides with diamines containing cyclic imide linkages. Since these polymers incorporate preformed imide groups, they are not subject to some of the problems encountered in the preparation…
The thermoelectric power and temperature coefficient of resistance of gold films has been measured and related to the energy dependence of both the mean free path of conduction electrons and the area of the Fermi surface. Values obtained for the quantities (dlnλ/dlnW)W=WF and (dlnA/dlnW)W=WF are − 0.60±0.04 and − 0.85…
The brackish-water diatom Cyclotella cryptica is a polymorphic species. Nine clones are capable of producing the valve pattern characteristic of the species C. meneghiniana, as well as the C. cryptica pattern. A study of the effects of salinity and freshwater conditions on the morphology of the valve shows that the cr…
Summary A formal description is given of a new class of algae, separated from the Xanthophyceae by several unique features of zoospore organisation, particularly the large size and special construction of the eyespot and the location of the flagellar swelling, and the form of the pyrenoid in the vegetative cell.
Teruaki Mukaiyama, Mitsunori Hashimoto; Phosphorylation by Oxidation-Reduction Condensation. Preparation of Active Phosphorylating Reagents, Bulletin of th
A low-temperature multiple-pass White cell is described which can be operated at any temperature between 120 K and room temperature. The path length can be varied from 60 m up to 2540 m in 80-m steps. The four-row multiple reflection system, a modified White arrangement, is enclosed in an aluminum dewar and can be foc…
Manganese-rich γ-phase alloys of Mn-Ni, Mn-Zn, Mn-Ga and Mn-Ge have been investigated with X-ray and neutron diffraction and specific heat measurements. The Mn-Zn, Mn-Ga and Mn-Ge alloys exhibit antiferromagnetism below the transition temperature, at which the cubic lattice is transformed to the tetragonal lattice (th…
Clear glasses form in the system Ag 2 O‐B 2 O 3 up to about 35 mol% (65 wt%) Ag 2 O. Infrared absorption, thermal expansion, and density data indicated an analogy to the Na 2 O‐B 2 O 3 system. Pentaborate‐triborate group pairs appear to be formed on addition of Ag 2 O to B 2 O 3 up to 20 mol% Ag 2 O and diborate group…
Zinc deficiency in dark-grown Euglena gracilis Klebs, Z strain Pringsheim, results in the disappearance of cytoplasmic ribosomes. In contrast, ribosomes in zinc-sufficient Euglena are conserved, do not undergo turnover, and can be demonstrated at any stage of growth. The zinc content of ribosomes from zinc-deficient E…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectral study of bisulfate-sulfate systems. II. Constitution, equilibriums, and ultrafast proton transfer in sulfuric acidD. E. Irish and H. ChenCite this: J. Phys. Chem. 1971, 75, 17, 2672–2681Publication Date (Print):August 1, 1971Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethods for calculating energy-level densitiesWendell ForstCite this: Chem. Rev. 1971, 71, 4, 339–356Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.org/doi/10.1021/cr60272a001https://doi.or…
The temperature dependence of elastic constants c 11 – c 12 and c 44 of Fe 2.05 Ti 0.95 O 4.00 is measured by the ultrasonic pulse echo method, using a small (110) platelet with approximate dimension of 5×7×1.364mm, for the temperature range of 77°∼300°K. c 11 – c 12 decreases anomalously with decreasing temperature i…
Many of the classical problems involved in the mechanism of photoconductivity in chemically deposited PbS layers have been resolved by a combination of (a) materials control, (b) measurements of conductivity, photoconductivity, Hall effect, thermoelectric effect, and oxygen sorption, and (c) analysis of an inhomogeneo…
The conduction-band structure of In1−xGaxP has been studied by cathodoluminescence (CL) and photoluminescence (PL). An accurate determination of the direct energy gap (± 10 meV) as a function of alloy composition (Δx = ± 0.025) is achieved by the simultaneous electron probe microanalysis of alloy composition and spect…
The thermodynamic data for the lanthanide and actinide metals have been combined with spectroscopic data to develop a method of estimating the energies of the electronic configurations of the neutral gaseous atoms. Energies are tabulated for the lowest spectroscopic level of each configuration. Many of the odd terms o…
A microwave structure was built that is, essentially a scaled up model of a cholesteric liquid crystal. The model consists of a series of thin plastic sheets to which copper wires are attached of dimensions small compared to the microwave length. The direction of the wires on successive sheets varies in a screw-type f…
The thermal expansion of ammonium chloride has been measured in the neighborhood of the order-disorder transition near 242 \ifmmode^\circ\else\textdegree\fi{}K. At 1 atm, the transition is found to be first order with a hysteresis of 0.21 \ifmmode^\circ\else\textdegree\fi{}K. The measured thermal expansion shows sampl…
Abstract A new theory of deformation and strain induced crystallization of network polymers has been developed. The effects of lattice vacancies, variation in distribution of trans and gauche bond conformations in stretched amorphous polymers, and the crystallite orientation in the partially crystalline stretched vulc…