Mechanical properties of alloys AMg5 and AMg6 at −196°C

Conclusions Alloy AMg5 is more suitable for operation at cryogenic temperatures, since its mechanical properties are superior to those of alloy AMg6.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 21–23, July, 1976.     

Fibre,film, and porous materials based on chitosan

The properties of chitosans of different origin and with a different degree of deacetylation were evaluated and the rheological properties of solutions of them in 2% acetic acid were investigated. Technological regimes for fabrication of film, fibre, and porous materials from the natural polysaccharide chitosan were proposed. The properties of the materials obtained were investigated.St. Petersburg State University of Design and Technology. Translated from Khimicheskie Volokna, No. 6, pp. 18–22, November–December, 1995.     

Expression of HIV-1 epitopes included in particles formed by human hepatitis B virus nucleocapsid protein

Hybrids of the core protein of hepatitis B virus (HBcAg) have been designed which carry N-terminal insertions of B- and T-cell epitopes of HIV-1 an immunodominant B-epitope from gp41, a T-cell epitope from p34 pol, and a cluster of B- and T-cell epitopes from p17 gag. The hybrids have been synthesized using two expression systems-one based on the thermoinducible PR promoter of bacteriophage lambda and the other one based on phi 10 promoter of bacteriophage T7 with 3-5% and 7-14% yields, respectively. The hybrids have dual HBV and HIV-1 immunospecificity and are assembled into particles similar to those formed by the protein carrier HBcAg. Sandwich ELISA and immune electron microscopy revealed that HIV-1 epitopes are exposed on the surface of the particles.     

The Outpatient Pediatric Neurology Service of Moscow today

The organisation of children's neurological service was considered in terms of 25 years of medical-diagnostic work of children's consultative neurological out-patient clinic (CCNC) attached to one of Moscow children's clinical hospital (Morozov hospital). The work of appropriate departments of CCNC was presented together with the consideration of the main problems of child's neurology as well as of the peculiarities of nervous system's pathology in terms of age. The close connection was emphasized between CCNC and child's neurologists of general out-patient clinics as well as the role of CCNC both in coordination of their work and in the rise of their qualification.     

A monoclonal inhibition enzyme immunoassay for detection of antibodies against hepatitis B core antigen: confirmation of an immunodominant epitope

We examined the situational antecedents of binge eating episodes and tested for consistency in the antecedents. We evaluated the antecedents of two successive binges via structured interviews with 50 normal-weight nonpurging females who regularly binge. Cluster analysis yielded two categories of binge-promoting situations: solitary negative affect situations and social eating situations. When this empirically derived classification of binge situations was used, the two successively occurring binges did not systematically fall into the same cluster. Consistency on other measures was also modest. Implications of these findings for conceptual models of binge eating and treatment, including the prospect of individually tailored interventions, are discussed.     

Silicon carbide detectors of high-energy particles

The results of studying 4H-SiC p ⁺-n junctions ion-implanted with aluminum as detectors of high-energy particles are reported. The junctions were formed in SiC epitaxial films grown by chemical vapor deposition. The concentration of uncompensated donors was (3–5)×10¹⁵ cm⁻³, and the charge-carrier diffusion length was L _p=2.5 μm. The detectors were irradiated with 4.8–5.5-MeV alpha particles at 20°C. The efficiency of collection of the induced charge was as high as 0.35. The possibilities of operating SiC detectors at elevated temperatures (∼500°C) are analyzed. __________ Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 36, No. 6, 2002, pp. 750–753. Original Russian Text Copyright ? 2002 by Violina, Kalinina, Kholujanov, Kossov, Yafaev, Hallén, Konstantinov.     

The effect of irradiation on the properties of SiC and devices based on this compound

Issues related to the production of radiation defects in silicon carbide of various polytypes and with differing conductivity types and concentrations of charge carriers as a result of irradiation with high-energy particles in a wide range of their energies and masses (from electrons to heavy Bi ions) are considered. The effect of irradiation with high-energy particles on the optical and electrical characteristics of the devices based on SiC are also considered, including the devices that operate as detectors of nuclear radiation. Systematic trends (common to other semiconductors and characteristic of SiC) in the radiation-defect formation in SiC are established. The high radiation resistance of SiC is verified; it is shown that this radiation resistance can be increased at increased energies of incident particles and at higher temperatures of operation.     

Photoelectric properties of p +-n junctions based on 4H-SiC ion-implanted with aluminum

The photoelectric properties of p ⁺-n junctions that were based on 4H-SiC ion-implanted with aluminum and were formed in lightly doped n-type epitaxial layers grown by chemical vapor deposition were studied. It is shown that such photodetectors combine in full measure the advantages of photostructures formed on the basis of Schottky barriers and epitaxial p-n junctions. The results of the theoretical calculation of spectral characteristics of ion-implanted photodetectors are in good agreement with experimental data. The structures feature an efficiency of collection of nonequilibrium charge carriers close to 100% in the spectral range of the photon energies of 3.5–4.25 eV.     

Proton Irradiation of 4H-SiC Photodetectors with Schottky Barriers

Semiconductors - For the first time, comprehensive comparative investigations of ultraviolet photodetectors with Cr Schottky barriers formed on 4H-SiC epitaxial layers are carried out by the X-ray...     

Comparative analysis of the influence of various models of energy supply on the wave drag of an airfoil

A comparative analysis of the efficiency of various models for the external energy supply to airfoil in transonic flight regimes has been carried out. It is established that a decrease in the wave drag of the airfoil is independent of the method of energy supply and is entirely determined by its magnitude. Particular features of a model only influence the local flow characteristics.