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No abstract available

No abstract available

No abstract available

No abstract available

[en] The novel method proposed by one of the authors to calculate exactly the response functions of the one-dimensional Tomonaga-model is described in more detail. The method is generalized for the case of a system of coupled chains where both the interchain and interchain interactions have forward scattering components only. The model does not show real phase transition at any finite temperature indicating that the interchain backward scattering or hopping is needed to have an ordering of the chains at finite temperature. (author)

[en] Deformation induced martensitic transformation was investigated in metastable austenitic stainless steel. This steel can present a microstructure of austenite (γ), α' martensite and non magnetic ε martensite. Uni-axial tensile test was used for loading at different temperatures below room temperature (from -120 to 20 deg. C). During the deformation the transformation takes place at certain places in an anisotropic way and texture also develops. Quantitative phase analysis was done by X-ray diffraction (XRD) and magnetic methods while the texture was described by X-ray diffraction using a special inverse pole figure. The quantitative phase analysis has shown that the formation of α' and ε martensite from austenite is the function of deformation rate, and deformation temperature. The transformation of the textured austenite takes place in an anisotropic way and a well defined crystallographic relationship between the parent and α' martensite phase has been measured

[en] In the paper a new method to study the critical fluctuations in systems of 4-epsilon dimensions around the phase transition point is developed. This method unifies the Kadanoff scaling hypothesis as formulated by Wilson by help of his renormalization group technique and the simple mathematical structure of the Lie equations of the Gell-Mann-Low multiplicative renormalization. The basic idea of the new method is that a change in the physical cut-off can be compensated by an effective coupling in such a way that the Green's function and vertex in the original and transformed system differ only by a multiplicative factor. The critical indices, the anomalous dimensions and the critical exponent describing the correction to scaling are determined to second order in epsilon. The specific heat exponent is also calculated, in four dimensions the effect of fluctuations appears in the form of logarithmic corrections. In the last sections the new method is compared to other ones and the differences are discussed. (Sz.N.Z.)

[en] A method is described for the determination of 17α-hydroxyprogesterone from blood samples obtained by heel prick and dried on filter paper. Discs (10 mm diameter) were cut from the filter paper and extracted in the assay tubes with 1 ml of a methanol/diethyl ether/ethyl acetate (50 : 45 : 5, v/v) solvent mixture. Antibody, tritium-labelled tracer and dextran-coated charcoal were added to assay tubes using a multichannel dispenser. The approach used permits one technician to analyze two series, each of 60 duplicate samples, within one working day. Thus the method is applicable for the centralized screening of suspected cases, while emergency samples may be analyzed at the same time within 4 h. Comparisons with a highly specific but more elaborate technique for the determination of blood 17α-hydroxyprogesterone showed a correlation coefficient of 0.99, and the regression equation for the present method (y) against the established method (x) was y = 1.07x + 2.72. The calculated upper reference limit (mean +- S.D.) for 17α-hydroxyprogesterone in healthy infants from two days to eight years of age was 7.5 ng/ml of serum. (Auth.)

[en] In this paper a survey is presented of recent experimental and analytical work carried out under a joint program at the Harwell Laboratory and Imperial College, placing the new work into the context of earlier developments. The basic balance equations for annular flow are introduced and the well-known triangular relationship reiterated. Then, interfacial waves and interfacial friction are reviewed, including some new results in both areas. A key feature in annular flow is the prediction of deposition and entrainment and recent developments are described. The various studies have led to a new framework for predictions of annular flow systems and the application of this framework to adiabatic flows, evaporating flows, steady-state dryout and transient dryout is described. Finally, new models covering the full range of dryout (CHF) ranging from subcooled conditions to high quality conditions are described; here dryout is limited by either film dryout (in annular flow) or by bubble wall crowding (at low quality ) and the new modelling structure allows a natural transition between the two