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A previous paper by Edwards & Toman on the subject of the variance non-additivity and curvature corrections is revised and extended. The formula for the curvature correction is given in a form which facilitates evaluation for cases of crystallite size broadening by crystallites of known shape; the formula involves…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
The effect of carbonate ions on the anodic behavior of a horizontal zinc anode in concentrated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:mo>KOH</mml:mo> </mml:math> solutions has been investigated by measuring the passivation time at constant current. An…
Transient-temperature burst tests were performed on both unirradiated tubing and irradiated fuel rods of Zircaloy at a variety of heating rates and internal pressures. Base-line tests, performed on unirradiated boiling-water reactor size tubing over a range of initial pressures at 600°F from 50 to 1000 psig and heatin…
Photoelectron and Auger-electron spectra are both obtained with x-ray excitation. Using the photoelectron spectra as internal energy standards, the energies of the prominent LMM Auger lines in Cu, Ni, and Fe have been accurately determined. In addition, the photoelectron spectra provide a measure of the vacancy distri…
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…