Materials Literature
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The main features are described of the Siemens Elmiskop 101 electron microscope when used in the low angle diffraction mode, and a review is given of the different methods employable for this purpose. Camera length and angular resolving power are given for each of these methods. The possibility of selected area diffra…
An investigation of several new disubstituted cinnamates reveals the existence of liquid crystalline properties, some exhibiting melting points below 60°.
Effects of the plastic deformation by cold rolling prior to or in the course of ageing on the age-hardening of Cu-1.41 wt% Be and Cu-2.01 wt% Be-0.2 wt% Co alloys have been investigated mainly by hardness measurements and electron microscopy. The results obtained are as follows:(1) Cold rolling of the specimens at the…
The effects of temperature, strain rate and oxygen in interstitial solid solution on the yield and flow stresses at low temperatures of alpha Ti–O alloys with 0.04∼0.45 at%O were studied to ascertain the rate controlling dislocation mechanism. The effect of interstitial oxygen atoms on the thermal component of the flo…
SummaryIn this multi-centre general practice study 2,557 patients requiring a diuretic for the treatment of oedema and/or hypertension received a mean daily dose of 37.5mg. mefruside for a mean of 67 days, either alone or in addition to other therapy. Mefruside was substituted in those patients already receiving diure…
The hyperfine interactions which broaden the Mössbauer effect (ME) spectrum in austenitic stainless steel have been investigated with the aid of 57Fe time‐differential perturbed angular correlations (TDPAC). The TDPAC measurements reveal a distribution of electric field gradients at the 57Fe nuclei with a mean value c…
The study by the mass-spectrometric Knudsen-cell method of the vapours in equilibrium with metal oxide + metal phosphide systems at 1000–1700 K made possible the identification of the molecules P2O3, P2O4, P2O5 and P3O6. Their atomization energies were determined, as well as those of the phosphorus oxides prevalent at…
Tilt and twist components are determined for cubic bicrystals meeting at a planar boundary. It is shown that any boundary is nearly either a twist or tilt boundary, but the distinction between the two types is, in some cases, ambiguous.
The solubility of iodine in PDS (polydimethylsiloxane) has been measured for varying degrees of polymerization (number of silicon atoms) from 2 to 470. The data obtained show good agreement with a solubility equation derived on the basis of the following two assumptions : (1) a PDS molecule is composed of several comp…
The hydroxyproline content and total amount of imino acids of whale nucleus collagen are in the range of variability usually observed in other mammalian collagen and about the same as the values reported for the collagen isolated from human intervertebral disc.Salt and acid extracted collagen of fetal whale nucleus pu…
A series of nematic liquid crystals which had been solvent recrystallized was further purified by use of the technique of zone refining. In all cases purity increased. Purity was determined using differential scanning calorimetry. Purity differences when the zone refiner was used at mesophase temperatures and isotropi…
Abstract A polybutadiene of high molecular weight was prepared in hydrocarbon solvent by using n ‐BuNa– tert ‐BuOM (M = Li, K) as a polymerization initiator. The microstructure of this polymer varied from 35 to 76% of 1,2 content, depending on the type of modifiers. The kinetics of polymerization was not studied, prim…
Abstract The hydrolytic degradation of poly(ester)‐urethanes (PUR) has been studied by viscometry of solutions of films that were treated for various times with water of fixed temperature. On the basis of some simplifying assumptions a general expression was derived relating the decay of the limiting viscosity number…
There is an apparent dearth of information concerning the chromosomes of the Appendicularia.A thorough search of the available literature has yielded only those observations summarized 8s follows : a diploid number of 6 for Oikopleura vanhoeaeni (SALENSKY, 1003) ; a diploid number of 7 of 0. rufescens (SALEXSKY, 1904…
Internal motions of polymer chains are classified into the local and the overall vibrations. The frequencies and modes of the latter are sensitive to the conformation of the chains. The discrimination between these two kinds of modes is explained, taking the 1,2-dichioroethane molecule as an example. The overall vibra…
The theoretical relation between the thickness of the oxide-layer and the oxidizing time was discussed in the case of oxidation of cylindrical and sliced copper to Cu2O in air at 990∼1045°C. Comparing the theoretical relation with experimental results, we obtain D=0.060exp[−(1.46±0.18)(eV)⁄kT] (cm2/sec) for the cylind…
Reaction of cobalt(II) phthalocyanine (CoPc) with thionyl chloride and with bromine leads to the formation of CoPcCl2 and CoPcBr2, respectively; magnetic i.r., oxidative titration, and e.s.r. data indicate these complexes to contain a phchalocyanine radical species, characterised in the solid state for the first time.
Thermal decempesition of Na, Mg, K, Ca, Mn, Co, Ni, Cu, Zn, Sr, Cd, Ba and Pb formates were investigated by use of gas chromatography and thermogravimetry.(1) Upon the decompositions of Na, Mg, K, Ca, Mn, Zn, Sr, Cd and Ba fermates, H2, CO and CO2 were formed as the main gaseous products, together with small amounts o…
Synopsis-A quantitative method for measuring and comparing the effect of various cos-metic treatments and products on the amount of FORCE needed to COMB a tress of HAIR is described. Photographs of the apparatus and a detailed description of the experi-mental procedure are provided. The results of several experiments…
The kinetics of desorption of surface oxide as CO and CO2 from graphite have been followed, using a mass spectrometer system, allowing their activation energies of desorption to be measured as a function of the amount desorbed. After the initial degassing of the graphite, surface oxide was reformed by chemisorption at…