Thermal and electrical properties of porous titanium

Conclusions The thermal conductivity, coefficients of thermal expansion and thermo-emf, and electrical resistivity of porous titanium have been determined in the temperature range from ambient to 800–1200°C. The effect of specimen porosity on the character of the thermal and electrical conductivities of porous titanium has been established. A study has been made of the effect of the- phase transformation on the electrical conductivity and thermo-emf of porous titanium. The thermal conductivity may be evaluated from the electrical conductivity with the aid of an experimentally established value of Lorentz number.Translated from Poroshkovaya Metallurgiya, No. 8 (92), pp. 35–38, August, 1970.     

Comparative study of antiradical effects of several antiglaucoma drugs

Studies of the in vitro inhibitory effects of drugs most often used in the treatment of primary glaucoma on the generation of the main active oxygen forms (hydroxyl radical, superoxide anion radical, singlet oxygen and radical products of hydrogen peroxide and peroxidase reaction) showed that antiradical activity is more intrinsic for thimolol and decreases in the following series: betoptic-pilocarpinclofelin. This once more validates the efficacy of beta-blockers in the treatment of glaucoma and prevention of cataract associated with it.     

Thermal expansion and elastic properties of high gold-Tin Alloys

The Au-Sn eutectic alloy, composed of the ζ and δ phases, has been used for many years in the sealing of hermetic parts. Recently, it was shown that the ζ phase undergoes an ordering transformation to ζ′. Since this transformation may affect hermeticity, measurements of density, linear thermal expansion coefficient, elastic moduli, and Poisson’s ratio were made on ζ-phase, eutectic, and δ-phase specimens. Measurements were made over a temperature range that includes the ζ → ζ′ transformation. Abrupt changes in these thermophysical properties, near the phase transformation temperature, are noted for ζ and eutectic specimens but not for the δ specimen.     

Thermal denaturation and circular dichroism properties of sheared and unsheared chromatins

Chromosomal studies of two brothers with mental retardation and dysmorphic features showed a 13p+ chromosome. The same 13p+ chromosome was found in the father and the other sib, who were both phenotypically normal. The relationship between the physical abnormalities and the chromosomal findings are discussed.     

针灸治疗顽固性呃逆

目的:针对呃逆用针灸治疗顽固性呃逆的疗效.方法:共76例患者治疗组采用针灸经络配穴,并加以补泻手法;对照组用中药汤剂治疗.结果:通过辨证施治,针灸调和阴阳,扶正祛邪,疏通经络,解除病因,停止呃逆,且未复发.结论:针灸治疗顽固性呃逆有显著的疗效.     

Thermal properties of adamantanol derivatives and their beta-cyclodextrin complexes in phosphatidylcholine bilayers

Differential Scanning Calorimetry (DSC) has been applied to study the thermal properties of the membrane perturbing antibacterial octyl- and dodecyl-bromide salts of quaternary dimethylamino adamantanol (ADM-8 and ADM-12 correspondingly) incorporated in free or complexed form with beta-cyclodextrin (beta-CD) into dipalmitoylphosphatidylcholine (DPPC) containing bilayers. The DSC results showed that the studied compounds exert pronounced thermotropic changes in DPPC bilayers when inserted as free molecules. These effects are reduced when are present in a complex form with beta-CD. Since the studied compounds exert destructive effects in membrane bilayers their insertion in membrane bilayers as complexes with cyclodextrin may result in differentiation of their activity. The obtained results suggest that their complexation with beta-CD may improve their biological profile. It also increases their aqueous solubility, a limited factor for their use as drugs.     

Thermal physical properties and dephosphorisation kinetics of rare earth oxides containing slags

ABSTRACT

The melting properties and viscosity of CaO–SiO₂–MnO–La₂O₃–CeO₂ slags, with mass ratios of 0.97 and 1.05 between CaO and SiO₂, were measured using the hot stage microscopy method and rotating cylinder method, respectively. In addition, the dephosphorisation kinetics of rare earth (RE) oxides containing slags was studied. For increasing mass contents of the RE oxides, La₂O₃ and CeO₂ (0, 3, 6, 9, and 12?wt.%), in the slag, the melting temperature initially decreases and then increases. Minimum values appeared for mass contents of 6?wt.%. RE oxide concentrations below 9?wt.% are beneficial to the decrease in viscosity, which increases significantly with the mass fraction of RE oxides in molten slags with a basicity of 1.05. In slags with a basicity of 0.97, the RE oxides favour the decrease in viscosity, which does not change noticeably as their mass fraction is increased above 6?wt.%. Finally, it was found that the rate-limiting step of the dephosphorisation process is the diffusion of phosphorus.