The possibility of interpreting the results of measurements of the radar characteristics of objects of complex shape using mathematical models

It is shown, using the example of two actual objects, that it is possible to interpret unclear and difficult-to-explain results of measurements of radar characteristics using methods of mathematical modeling. __________ Translated from Izmeritel’naya Tekhnika, No. 3, pp. 44–46, March, 2008.     

Improved metrological reliability in DAS from using cross-correlation processing of measurement channel signals

Cross-correlation processing is considered for measurement channel signals in order to improve the metrological reliability of a data acquisition system by automatic correction of the results. __________ Translated from Izmeritel’naya Tekhnika, No. 3, pp. 15–18, March, 2006.     

Features of the procedure for measuring the amplitude backscattering diagrams of very large objects using ground radar measuring systems

A procedure for measuring the backscattering diagrams of large objects is considered, which reduces the components of the error due to the long-term instability of the parameters of radar measuring stations, when using a calibration without removing the object being investigated from the operating region of the measuring system. The results of an experimental check of the procedure are presented. __________ Translated from Izmeritel’naya Tekhnika, No. 6, pp. 48–50, June, 2008.     

Experimental-numerical investigation of the dynamic stability of flexural-torsional vibrations of compressor blades under conditions of attached and separated flow. Part 2. Cross aerodynamic characteristics

We consider the results of investigation of cross aerodynamic characteristics of compressor blades and their dynamic stability under flexural-torsional vibrations for the cases of attached and separated flows in broad ranges of variations of the phase shift, the ratio of amplitudes of the translational and angular components of displacements, the angle of attack, the reduced frequency of vibrations, and the geometry of the blade cascade. Translated from Problemy Prochnosti, No. 4, pp. 89–100, July–August, 2009.     

Synthesis and purple-blue emission of antimony trioxide single-crystalline nanobelts with elliptical cross section

Single-crystalline orthorhombic antimony trioxide (Sb₂O₃) nanobelts with unique elliptical cross sections and purple-blue photoluminescence have been synthesized. The uniform Sb₂O₃ nanobelts are 400–600 nm in width, 20–40 nm in thickness at the center and gradually become thinner to form sharp edges sub-5 nm in size, tens of micrometers in length, and with [001] as the preferential growth direction. Self-assembly of tens of nanobelts into three-dimensional (3-D) flower-like nanostructures has been observed. Analysis was performed by X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The Sb₂O₃ nanobelts display intense purple-blue photoluminescence centred at 425 nm (∼2.92 eV). The successful synthesis of nanobelts with elliptical cross sections may cast new light on the investigation of the property differences between nanobelts with rectangular cross sections and those with other cross section geometries. The Sb₂O₃ nanobelts can be used as effective purple-blue light emitters and may also be valuable for future nanodevice design. Electronic Supplementary Material  Supplementary material is available for this article at and is accessible for authorized users.     

Rectangular Wires in Pulse-Heating Experiments

The electric and temperature fields in a pulse-heated wire with a quadratic cross section are calculated analytically. The quick increase of the current through the wire during the pulse-heating process results in a nonuniform electric field (skin effect), and thus also a nonuniform temperature field over the wire cross section. By means of a typical pulse-heating experiment performed on a quadratic niobium wire, the magnitudes of the deviations of these fields from their mean values are graphically displayed. Compared with the strength of the mean fields, these deviations are significant only in the first few μs of the heating process. Paper presented at the Seventh International Workshop on Subsecond Thermophysics, October 6–8, 2004, Orléans, France.     

Measurement of the natural frequencies of a uniform rod loaded with centrifugal forces using a laser Doppler vibrometer

An experimental investigation of transverse vibrations in a rotating uniform plate, possessing double symmetry in the transverse cross section, is described. A method of modeling the centrifugal force acting on a uniform plate (under static conditions) and measurement details are presented. Test data are given. The results obtained agree well with calculations of the natural frequencies for the second and third harmonics of natural oscillations. __________ Translated from Izmeritel'naya Tekhnika, No. 1, pp. 30–33, January, 2006.     

The use of wavelet transformations to measure the local effective scattering cross sections of a sphere in a superbroad frequency band

The use of wavelet transformations to measure local effective scattering cross sections in a superbroad frequency band is described using the example of a model object of simple form (a sphere). __________ Translated from Izmeritel'naya Tekhnika, No. 8, pp. 48–51, August, 2008.     

Stress analysis of functionally gradient beam using effective principal axes

The mechanical model is established for the functionally gradient material (FGM) beam with rectangular cross section. A new method of effective principal axes is put forth, based on which the normal stress formula is derived for the FGM beam. The method is verified to be correct by the retrogression of it to the centroidal principal axes method of the traditional beam made of homogeneous elastic material. For several different loading cases, the␣effects of the non-homogeneity parameter on the distribution of the normal stress and on the position of the neutral axis are discussed. It is indicated that, with the increase of the absolute value of the non-homogeneity parameter, the normal stress at the more rigid region in the cross section increases, the normal stress at the less rigid region decreases, and the neutral axis moves toward the more rigid region.     

错流离心分级技术的研究

通过分析分级设备中分级力场方向和介质流体流动方向 ,提出了错流分级和逆流分级的概念 ,并在详细讨论这两种不同分级形式各自特点的基础上 ,设计出一种新型的错流离心分级设备。分级实验结果表明 ,该分级设备不仅适用于微细粉末分级 ,而且能在一次分级过程中获取多个窄级别分级产品