John E. Davies、Bryan M. Gatehouse、Keith S. Murray1973-01-01Journal of the Chemical Society Dalton Transactions
The crystal and molecular structure of the title compound have been determined by single-crystal X-ray analysis All non-hydrogen atoms conform to space group P2/c with a= 6·536 ± 0·007, b= 7·768 ± 0·008, c= 17·194 ± 0·017 Å, β= 108·8 ± 0·1°. Z= 2. The structure has been determined from diffractometer data by Patterson…
Metal complexes synthesis and propertiesMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
Yves Bouligand1973-01-01Journal de physique
Les textures en éventails sont très communes entre lame et lamelle, dans les cristaux liquides cholestériques, proches de la transition isotrope. Ces textures renferment un bon nombre de disinclinaisons + π et — π arrangées selon certains motifs aisément reconnaissables. Dans une dislocation-coin, une disinclinaison +…
Liquid Crystal Research AdvancementsLipid Membrane Structure and Behavior
Mott Nevill1973-01-01Electronics and Power
Interest has recently been shown in the possibility of using amorphous materials such as glasses in electronic switching devices. The theory underlying the operation of these devices is still not fully understood, but some lines of approach have proved promising.
Glass properties and applicationsPhase-change materials and chalcogenidesMagneto-Optical Properties and Applications
B. Bergersen、F W Kus、Clas Blomberg1973-01-01Canadian Journal of Physics
A discussion of how to carry out a direct perturbation expansion for the one-electron Green's function is given using an electron–plasmon model for the conduction electron correlations. A crucial feature of the method is the consistent extraction of energy shifts. Numerical results for the spectral function and the de…
Advanced Chemical Physics StudiesElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena
T.D. Chikalla、Rhéal P. Turcotte1973-01-01Radiation Effects
Self-irradiation damage due to alpha particle and recoil atom bombardment has been studied in 238PuO2. In a well-annealed sample, the room temperature damage ingrowth follows a simple exponential function to the saturation damage level. In incompletely annealed samples, the damage ingrowth curve is discontinuous and e…
Nuclear Materials and PropertiesIon-surface interactions and analysisNuclear materials and radiation effects
M. S. Lehmann、J.J. Verbist、Walter C. Hamilton 等 4 位作者1973-01-01Journal of the Chemical Society Perkin Transactions 2
L-Arginine dihydrate, C6H14N4O2,2H2O, crystallizes in the orthorhombic space group P212121 with a= 5·638(6), b= 11·85(1), c= 15·68(1)Å, and Z= 4. The structure has been refined to R 0·034 (1364 reflections) by neutron diffraction techniques, and all hydrogen atoms located precisely. The arginine molecule is a zwitteri…
Crystallography and molecular interactionsEnzyme Structure and FunctionX-ray Diffraction in Crystallography
L. Piseri、B. M. Powell、G. Dolling1973-01-01The Journal of Chemical Physics
The normal modes of vibration propagating along the unique c axis of stretch-oriented polytetrafluoroethylene at −11, 25, and 40°C have been studied by means of coherent neutron inelastic scattering methods. No significant effects associated with the 19 and 30°C phase transitions have been definitely observed. The res…
Polymer Nanocomposites and PropertiesAdvanced Physical and Chemical Molecular InteractionsPolymer Nanocomposite Synthesis and Irradiation
J. Benton Jones1973-01-01Communications in Soil Science and Plant Analysis
There has been a marked change in the soil testing procedures used in the United States by state soil testing laboratories since the early 1950's. In the Coastal Plain states of the south and east, the Double Acid extraction procedure is used for P, K, Ca, and Mg determinations. Bray P1 is the most frequently used met…
Clay minerals and soil interactionsWater Quality and Resources Studies
H. S. Subramhanyam、D. Krishnamurti1973-01-01Molecular crystals and liquid crystals
In a nematic medium, as a result of the anisotropic distribution of the molecules, the average local electric field is of the form E+ γP, where E is the applied field, P the polarization, and γ is a factor which is different for the directions parallel and perpendicular to the optic axis. For the nematic medium, the N…
Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesMolecular spectroscopy and chirality
G. C. Allen、P. M. Tucker1973-01-01Journal of the Chemical Society Dalton Transactions
X-Ray photoelectron spectroscopy has been used to study the oxidation of uranium metal. The results indicate that even at 1073 K in a residual oxygen partial pressure of less than 1 × 10–8 N m–2 the interdiffusion of pure uranium and the surface oxide film is not sufficiently rapid to produce a completely pure uranium…
Nuclear reactor physics and engineeringRadioactive element chemistry and processingNuclear Materials and Properties
T. D. Brown、Thomas Shepherd1973-01-01Journal of the Chemical Society Dalton Transactions
Investigations of tris- and tetrakis-hexafluoroacetylacetonato- and trifluoroacetylacetonato-terbium(III) complexes have established that the temperature-dependence of the 5D4 lifetime is caused by thermal depopulation of the ion level to a ligand triplet state. Ligand triplet to ground state deactivation rates, A, ha…
Photochemistry and Electron Transfer StudiesLanthanide and Transition Metal ComplexesElectrochemical Analysis and Applications
J. Petzelt、J. Grigas1973-01-01Ferroelectrics
Far infrared reflectivity of Sb2S3, Bi2S3 and Sb2Se3 single crystals in the spectral region 25-400 cm-1 and temperature region 100-400°K were measured in polarized light. The reflectivity spectra were subjected to the Kramers-Kronig analysis to obtain dielectric response functions. The far infrared dispersion is of a…
Chalcogenide Semiconductor Thin FilmsPhase-change materials and chalcogenidesAdvanced Semiconductor Detectors and Materials
T.J.R. Weakley1973-01-01Journal of the Chemical Society Dalton Transactions
Salts of the heteropolyanions PCoIIW11O40H25–, AsCoIIW11O40H25–, BCoIIW11O40H27–, BCoIIIW11O40H26–, and PZnW11O40H25– have been prepared. In the case of the first four and of PNiIIW11O40H25– there is spectroscopic evidence that the constitutional water is present as an actual water molecule and is replaceable by, e.g.…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsChemical Synthesis and Reactions
Kenneth A. Murphy、N. Hershkowitz1973-01-01Physical review. B, Solid state
M\"ossbauer absorption spectra have been observed for ${\mathrm{Fe}}_{2}$B from 290 to 1175 \ifmmode^\circ\else\textdegree\fi{}K. A change in the electric quadrupole interaction was observed from 460 to 480 \ifmmode^\circ\else\textdegree\fi{}K and interpreted as a result of the rotation of the easy axis of magnetizati…
Microstructure and Mechanical Properties of SteelsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
A. E. Clark、Henry S. Belson、Nobuaki Tamagawa 等 6 位作者1973-01-01AIP conference proceedings
Magnetization and magnetic torque measurements were made on single crystals of ErFe2 from 77°K to 329°K. From these measurements the magnetocrystalline anisotropy constants were deduced. At room temperature K1 = −3.3 × 106 ergs/cm3; at 77°K, −K1 > 108 ergs/cm3. Huge magnetic anisotropies are predicted for TbFe2 and Dy…
Magnetic properties of thin filmsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
F. Brochard1973-01-01Molecular crystals and liquid crystals
-We study the hydrodynamic motion induced by the rotation of the molecular axis in a nematic liquid crystal (backflow). This effect can reduce strongly some effective viscosity coefficients.
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesSurfactants and Colloidal Systems
B. V. Kokta、J. L. Valade、W. N. Martin1973-01-01Journal of Applied Polymer Science
A dynamic TGA method was used to study the effect of the molecular weight of well-defined polystyrene samples as well as the effect of heating rate and sample weight on the kinetic parameters of the thermal decomposition. It is shown that the maximum rate, the average specific rate, and the activation energy of the de…
Polymer crystallization and propertiesMicroplastics and Plastic PollutionThermal and Kinetic Analysis
William J. MacKnight、Mingshu Yang1973-01-01Journal of Polymer Science Polymer Symposia
Abstract Temperature dependent infrared studies have been carried out on three series of poly‐urethanes previously synthesized and characterized. The repeat units of the three series may be schematically represented as follows: magnified image In each case n varies from 2 to 10. The H and DP series are partially cryst…
Polymer composites and self-healingFlame retardant materials and propertiesSynthesis and properties of polymers
E. C. Subbarao1973-01-01Ferroelectrics
A concise compilation of ferroelectric and antiferroelectric materials, known up to 1971, is presented together with the Curie and other transition temperatures. Spontaneous polarization values are given in the case of ferroelectrics.
Liquid Crystal Research AdvancementsAcoustic Wave Resonator TechnologiesSolid-state spectroscopy and crystallography
J. D. Dunitz、David White1973-01-01Acta Crystallographica Section A
The usual analysis of thermal-motion parameters, derived from X-ray diffraction data, in terms of rigid-body motions can be extended to include the effect of certain specified internal molecular motions.
High-pressure geophysics and materialsAdvanced Physical and Chemical Molecular InteractionsThermal and Kinetic Analysis