Proceedings 6th Russian-Korean International Symposium on Science and Technology. KORUS-2002 (Cat. No.02EX565)
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New methods of generation of electrophilic iodine in neutral and weakly acidic media
- Trang 314-316
We have developed new methods to generation of electrophilic iodine on the base iodine chloride and different salts: ICl+MeX/spl rarr/I/sup +/X/sup -/+MeCl, Me=Ag/sup +/, Pb/sup +/, Na/sup +/; X=CF/sub 3/COO/sup -/, CH/sub 3/COO/sup -/. Iodinating ability of obtained reagents has been studied on aromatic (including polycyclic) and heterocyclic compounds.
#Silver #Chemistry #Temperature #Oxidation #Atmosphere #Nitrogen #Electronic mail #Medical diagnostic imaging #Modems #Lead
Breaking strength of base metal-coating composition
- Trang 178-181
The influence of coatings on the change in crack resistance of the substrate must be evaluated. The mechanical properties of the base metal as determined after ion-plasma spraying of titanium nitride coatings do not significantly depend on the duration of heating during spraying (/spl sigma//sub 0.2/=1150, /spl sigma//sub 2/=1400; /spl Psi/=36%). Characteristics obtained by testing metal specimens......
#Coatings #Thermal spraying #Surface cracks #Surface resistance #Mechanical factors #Steel #Plasma temperature #Titanium #Heating #Plasma properties
Seven easy steps for designing the four-terminal silicon pressure piezotransducer
- Trang 397-401
The analytical method for designing of the four-terminal silicon pressure piezotransducer (FTSP transducer) with various geometrical form of the current spread region (CSR) is presented. In this paper the crystal planes of silicon [100] and [110] were considered, the optimal places for location as well as the optimal angular orientations of the transducer on the surface of crystal are shown. Vario......
#Silicon #Transducers #Circuits #Voltage #Conductivity #Boundary value problems #Symmetric matrices #Transmission line matrix methods #Temperature sensors #Piezoresistance
Analysis of productivity of contemporary Russian economy
- Trang 103-106
In the article, the author considers the problems of the influence of material technological (noninstitutional) environment on the efficiency of economic institutions. With the help of modeling, he shows that in the dependence on a material-technological basis, there are economies of two types: productive and unproductive. The attempts of establishing of the market institutions in unproductive eco......
#Productivity #Environmental economics #Space technology #Matrices #Investments #Innovation management #Elasticity #Aggregates #Mechanical factors #Profitability
Parametric x-ray radiation of 5.7 MeV electrons from a pyrolytic graphite crystal
- Trang 300-302
Parametric x-ray radiation (PXR) from a mosaic pyrolytic graphite crystal is studied using a 5.7 MeV electron beam. The first-order [002[ PXR reflection is detected in the Bragg angle, with the emitted photon energies peaking around 8 MeV. The detection angle /spl Theta//sub D/=2/spl Theta/ /sub B/=27/spl deg/ with respect to the e-beam, where /spl Theta//sub B/ is the Bragg angle. The target is 0......
#Photonic crystals #Magnetic separation #Electron beams #Magnetic semiconductors #Magnetic shielding #Electromagnetic scattering #Particle scattering #X-ray scattering #X-ray detectors #Optical reflection
The equations of bending of multilayer axisymmetrical shells, taking into account continuous heterogeneity in thickness of each layer
- Trang 193-196
The axisymmetrical shells from multilayer anisotropic materials are considered. All layers are nonuniform in thickness (i.e. the mechanical performances of each layer are arbitrary continuous functions from transversal coordinates). For the specified constructions at arbitrary type of loading on the basis of the offered hypotheses from a variation principle of possible displacements, the equilibri......
#Equations #Stress #Nonhomogeneous media #Boundary conditions #Mechanical factors #Chemical technology #Chemical analysis #Kinematics #Structural beams #Anisotropic magnetoresistance
Effects of structural damping on composite panel flutter
- Trang 11-14
The governing equation for the analysis of panel flutter of composite plates including structural damping is derived using the energy method. The classical lamination theory is applied to structural modeling and the eigenvalue problem is obtained by the Rayleigh-Ritz method. The unsteady aerodynamic load in supersonic flow is computed by the piston theory. The critical dynamic pressures for compos......
#Damping #Aerodynamics #Vehicle dynamics #Equations #Stability #Hysteresis #Pistons #Optical fiber theory #Linear approximation #Transportation
A circular aperture synthesis for tomography
- Trang 374-378
The object of consideration is a circular trajectory aperture synthesis at short distance from the plant for the purposes of coherent tomography. This research requires the plant to be lighted by continuous monochromatic non-modulated signal. The process of circular aperture synthesis reduces to convolution of trajectile Doppler signals reflected from the complicated plant being tomographed with t......
#Tomography #Signal synthesis #Apertures #Image restoration #Signal processing #Signal restoration #Convolution #Light scattering #Rotation measurement #Phase measurement
The dielectric and piezoelectric properties of MBi/sub 4/Ti/sub 4/O/sub 15/ (M=Sr, Sr/sub 0.5/Ca/sub 0.5/, Ca) ceramics
- Trang 284-287
We have investigated the crystalline structure, dielectric, ferroelectric and piezoelectric properties of the MBi/sub 4/Ti/sub 4/O/sub 15/ (M=Sr, Ca, Sr/sub 0.5/Ca/sub 0.5/) ceramics. The remanent polarization(P/sub r/) of SrBi/sub 4/Ti/sub 4/O/sub 15/(SBT) and CaB/sub 14/Ti/sub 4/O/sub 15/(CBT) ceramics was 2.2 /spl mu/C/cm/sup 2/ and 0.3 /spl mu/C/cm/sup 2/, respectively. The k/sub t/ of SBT and......
#Strontium #Ceramics #Ferroelectric materials #Powders #Hafnium #X-ray scattering #Biological materials #Dielectric materials #Piezoelectric materials #Scanning electron microscopy
Influencing of joint action of temperature fields and force loading on stability of annular orthotropic plates
- Trang 34-37
Orthotropy of a plate's material it is supposed cylindrical. The radially symmetrical compressing or expanding pressure acts on an inner edge of a plate. At a plate there is a radially symmetrical field of temperatures. The combined effect of the thermal and force factors of influence on buckling of a plate is investigated. The solution is executed by a Ritz's method using the variational formulat......
#Temperature #Stability #Thermal stresses #Tensile stress #Aerospace materials #Boundary conditions #Thermal force #Eigenvalues and eigenfunctions #Thermal factors #Conducting materials