Materials Literature
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Abstract Polarized Raman spectra of single crystals of NaH 2 PO 4 ·2H 2 O and NaD 2 PO 4 ·2D 2 O have been measured as a function of temperature in the wavenumber shift range 10–3600 cm −1 . Changes of phonon frequencies due to directional dispersion are found. All the observed bands have been assigned using group the…
Al-coated glasses of molar composition 20Na2O-10CaO-70SiO2 have been bombarded with a rastered beam of either 7- or 10-keV electrons. SIMS analysis of these glasses indicates a near-surface layer deficient in Na, bounded by a steep rise of the Na signal. The thickness of this layer increases with electron-bombardment…
Abstract Ag 2 BaGeS 4 was prepared for the first time and the crystal structure determined using X-ray methods, a - b = 682,g; c = 801, 7 pm, Space group I4̅2 m (No. 121) tetragonal. The atomic parameters and interatomic distances are reported and the structure is discussed.
The doping method in quantitative X-ray diffraction phase analysis is described. The method involves the addition to the investigated system of known amounts of the components, the weight fractions of which are to be simultaneously determined. The weight fraction of a component is related to the intensities diffracted…
The application of optical second harmonic generation (SHG) to the study of non-centro-symmetry in 71 α-amino acids, 22 dipeptides. 6 tripeptides. 16 proteins, and 5 viruses is reported. All α-amino acids except α-glycine, all peptidcs containing at least one enantiomeric α-amino acid residue, and all proteins and vir…
With a partial-wave interpolation method we calculate the electron bremsstrahlung energy spectra from neutral atoms with atomic number $Z=13 \mathrm{and} 92$ for incident electrons of kinetic energy ${T}_{1}=5 \mathrm{and} 10$ MeV. This is an attempt to bridge the gap between the results we have previously obtained fo…
Electrical conductivity of the sintered Nb 2 O 5 ‐ doped CeO 2 specimens was measured between 800° and 1329°C in the p O 2 range 10 −19 –1 atm. A polarization technique was used to determine the predominant electrical conduction mode in these specimens. Thermogravimetric analysis was done to measure the weight loss in…
Abstract Polymeric materials with novel properties for new technological applications are increasingly obtained by combining existing polymers, while the synthesis of new monomers has receded into the background. These polymer combinations or “alloys” (polyblends) are characterized by their chemical composition, the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between structure and magnetic exchange interactions in bis(hexafluoroacetylacetonato){N,N'-ethylenebis[2-hydroxypropiophenone iminato-N,O(2-)]copper(II)}M'(II), Cu((prp)2en)M'(hfa)2, where M' = Cu, Ni, and Mn. Crystal structures of the complexes(M((prp)2en)M'(hfa)2…
A semi-empirical model is developed to describe the structure of porous coal char. The pores are assumed to be cylindrical tubes of length lp and radius rp . The number of pores whose radius is between rp and rp + drp is denoted by a pore distribution function. A statistical theory and the available data suggest a rp…
The myofibroblast population was studied by electron microscopy in rat wounds healing by (1) contraction of granulation tissue, (2) by coverage with split-skin grafts, and (3) by coverage with full-thickness skin grafts. In all 3 types of wounds, myofibroblasts appeared early and reached a peak number at two weeks aft…
A mechanism of irradiation creep arising from the climb-enabled glide of dislocations due to stress-induced preferred absorption of radiation-produced point defects is proposed. This creep component is here termed preferred absorption glide, PAG. PAG-creep operates in addition to the previously studied components of c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral method for the preparation of substituted tetrathiafulvalenes and directing effects of substituentsDennis C. GreenCite this: J. Org. Chem. 1979, 44, 9, 1476–1479Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1 Ap…
"Computer Techniques for Image Processing in Electron Microscopy." Optica Acta: International Journal of Optics, 26(4), p. 418
B Feuerbach, B Fitton and R F Willis 1978 Chichester: John Wiley xviii + 540 pp price £19.50 This volume represents a timely and welcome contribution to the literature on photoemission and electron states at surfaces. It consists of a series of review articles, written by experts in their individual fields, falling in…
Abstract The oxidation of polyethylene, polypropylene, and polystyrene by exposure to plasmas excited in pure oxygen and helium–oxygen mixtures at low power levels has been studied. A detailed curve resolution procedure is outlined, and the rate of oxidation is shown to be a strong function of the polymer structure fo…
Protective clothing against heat and flames should be evaluated not only for flame-rwistance but also for protection. against various heat exposures from convection, radiation, and conduction sources, depending on the end-use, to ensure a realistic assessment of the potential protection offered and required. Evaluatio…
Abstract A group of natural materials having anhydroglucose units linked by glycosidic bonds, as well as other related compounds, were irradiated with plasmas generated by a radio frequency field (13.56 MHz). Reactive sites created were characterized by electron spin resonance, chemiluminescence, infrared, and x‐ray p…
For certain occupations special clothing is worn t provide protection against heat and fire; the amount of protection needed varies widely with the specific occupation. Fabrics made from natural fibers have been traditionally used for ordinary protection such as that needed in routine work situations of foundary worke…
Acute animal experiments indicate that ventricular vulnerability to fibrillation or multiple premature contractions is greater during bipolar or anodal stimulation than with unipolar cathodal (with electrodes of equal cathodal and anodal surface area) because the anodal and bipolar absolute refractory periods are shor…