Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Dispersion in Branched Polypropylene OxidesW. H. Stockmayer and J. J. BurkeCite this: Macromolecules 1969, 2, 6, 647–650Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi…
Absolute differential cross sections of electrons elastically scattered by Hg have been measured at 500, 400, and 300 eV. We find that over this energy range, for angles between 2.5° and 20°, the measured cross sections can be accurately described using the Born approximation with a long-range effective potential of t…
The far-infrared spectra of thin films of ammonium iodide were recorded from − 170°C to room temperature. The results varied with the temperature at which the films were formed thus making the interpretation of the spectra difficult. Laser excited Raman spectra of polycrystalline NH4I, ND4I, NH4Br, and ND4Br were also…
On étudie la structure de gouttelettes de cristal liquide nématique en émulsion dans un liquide isotrope. Suivant la tension superficielle, les molécules sont normales ou tangentes à la surface. Les configurations stables sont alors soit en étoile, soit bipolaires. On calcule l'énergie de telles configurations en cham…
A bubble that would ordinarily dissolve in a liquid may instead grow by a process known as rectified diffusion, if it is located in a sound field of sufficient pressure amplitude. Threshold conditions for bubble growth and the rate of bubble growth have been measured for air bubbles in air-saturated water at an acoust…
Abstract A method is derived for the design of stirred tank reactors for homogeneous reactions. A simple mixing model proposed previously by Curl (4) is used to compute the effects of finite mixing time on complex chemical reactions. It is also shown how the parameters of the model can be obtained by tracer experiment…
1. Conductivity and u.v. and visible spectroscopic techniques were used to investigate the solution structure of the prosthetic group of the ferric haemoproteins (ferrihaem) in dimethyl sulphoxide, NN-dimethylacetamide, NN-dimethylformamide and sulpholane, and certain of their aqueous mixtures. 2. In neutral or acid d…
The heat capacity of RbAg4I5 has been measured in an adiabatic calorimeter between 5 and 340°K. The compound undergoes transformations at 121.8 and at 209°K and exhibits a very sizable configurational heat capacity. The latent heat and entropy changes of the apparently first-order transformation at 121.8°K are 190.9 ±…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of the metal atom in the reversible uptake of molecular oxygen. The structures of the molecular oxygen complexes formed by bis[bis(diphenylphosphino)ethane]iridium(I)hexafluorophosphate and its rhodium analogJohn A. McGinnety, Nicholas C. Payne, and James A. IbersCite t…
A modified close-coupling expansion has been developed and applied to calculate elastic electron-hydrogen-atom scattering phase shifts. This expansion into a complete discrete orthonormal basis set is a variant of the more usual close-coupling expansion into eigenstates of the target Hamiltonian. We retain the first f…
Abstract Stress-induced crystallization in a rapidly stretched natural rubber gum vulcanizate has been studied using thermal techniques to follow the development of crystallinity. A special-purpose analog computer has been assembled and used online to process the thermal and mechanical data obtained in high speed tens…
Abstract The viscosity‐average molecular weight, M v , of a polymer is given operationally through its limiting viscosity number [η] and the Mark‐Houwink equation [η] = KM v α , where K and α are empirical constants. If [η] is measured under different conditions, α and M v will vary for the same sample. M v α is the α…
Abstract In Fortführung früherer Arbeiten wurden die Oberflächen‐Spannungen von NaOH‐ und KOH‐Lösungen im Konzentrationsbereich bis ζ NaOH = 0,7 und ζ KOH = 0,6 und für Temperaturen von 20 bis 170°C nach dem Prinzip des maximalen Blasendruckes gemessen und als Ausgleichsfunktionen dargestellt. Die größte relative Abwe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of high- and low-spin nickel(II) complexes containing the macrocyclic ligand tetrabenzo[b,f,j,n,][1,5,9,13]tetraazacyclohexadecineStuart W. Hawkinson and Everly B. FleischerCite this: Inorg. Chem. 1969, 8, 11, 2402–2410Publication Date (Print):November 1,…
The standard method of determining the index homogeneity of optical-quality glass windows has been extended to improve the accuracy of the results, and to enable disks of over 20 in. (50 cm) in diameter to be evaluated with comparative ease. The evaluation of a 34 in. (85 cm) diameter disk of fused silica illustrates…
Measurements of the thermal conductivity and Righi-Leduc coefficient of Cd 3 As 2 have been made in a transverse magnetic field of up to about 2 T, at temperatures between 68 °K and 300 °K. For one sample the measurements have been extended down to 8 °K. The measurements have allowed the separation of the lattice and…
The site symmetry of Nd3+ in single-crystal [(C6H5)3PH]3NdCl6 is predicted by considerations of molar absorptivity, vibronic spectra, and stoichiometry. A calculation of the crystalline-field splitting of 4f3 J levels appears to predict a sixfold octahedral site symmetry with a slight distortion along one of the axes,…
A general theory of optical-aberration tests, encompassing many well-known practical tests, is presented, utilizing the formalism of spatial filtering, employing coherent illumination. The basic diffraction integrals of the Ronchi-grating test, Foucault knife-edge test, phase Foucault knife-edge test, and the Zernike…
Spin echoes and their external magnetic field effects have been observed on Heusler alloys, Cu 2 MnAl, Cu 2 MnIn and Cu 2 MnSn at 4.2°K. The sign of the internal magnetic field at nuclei of the constituent elements has been determined to be negative, and on the basis of the R-K-K-Y interaction semiquantitative agreeme…
Cr 7 Te 8 exhibits two types of crystal structure according to the difference of thermal treatment; one is the ordered and the other is the disordered arrangements of the vacancies among the successive Cr layers. The saturation moments and the magnetic susceptibilities of both structures are measured in the temperatur…