G. P. Arnautov, E. N. Kalish, Y. F. Stus, M. G. Smirnov, I. A. Bunin, D. A. Nosov
Keywords: corpuscular theory of the nature of gravitation, Solar eclipse, laser ballistic gravimeter, tidal variations of gravity, gravitation absorption coefficient
Pages: 115-118
Tidal variations of gravity Δg measured with an error smaller than 1 µGal = 1·10−8 m/s2 during the Solar eclipses on July 31, 1981 and August 1, 2008 with the absolute laser ballistic gravimeters developed and fabricated by the authors are presented.
This paper considers a destructive method of testing the strength flip-chip assemblies (in particular, photodetectors) which consists of separating one microcircuit from another with heating (not below 383 K) after thermal cycling. The method can be used to test the adhesive properties of bonding bumps, for example indium ones, in flip-chip assemblies and determine the causes of debonding in photodetectors. Examples of the causes of failures of cooled photodetectors based on HgCdTe molecular beam epitaxy are discussed.
a:2:{s:4:"TEXT";s:93:"A. G. Vostretsov1, V. A. Bogdanovich2, and V. I. Bud’3";s:4:"TYPE";s:4:"html";} 1Novosibirsk State Technical University, Novosibirsk, Russia E-mail: vostretsov@adm.nstu.ru 2St. Petersburg State Electrotechnical University, St. Petersburg, Russia 3National Anti-Doping Center, Kiev, Ukraine
Pages: 1-7
The problem of processing mass-spectrum data in dope testing is considered. It is shown that this problem concerned with dope testing is characterized by a high level of a priori uncertainty. It is proposed to use a contrast method for detecting mass-spectrum peaks. The main point of the method is as follows. At first, a sample of observations without a useful signal is taken (i.e., there is no bioassay in the mass-spectrometer work chamber, in this case, the mass-spectrum depends only on the features of the measuring channel and remains of dirt in the work chamber). Then the work sample in which the useful signal has to be detected is taken. Optimal detection algorithms based on statistical principles of invariance and unbiasedness are obtained. Results of statistical tests of the algorithm and a full-scale experiment are presented.
M. V. Okhapkin1, 2, P. Antonini1, and S. Schiller1 1Institute for Experimental Physics, Dsseldorf University, Dsseldorf, Germany 2Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia E-mail: maxok@laser.nsc.ru
Pages: 8-14
An alternative design of a frequency spectrum synthesizer for an optical time standard with a lower-level spectral density of noise FM at the synthesizer outputs is considered. This is achieved by using a transistor generator with frequency stabilization by a dielectric resonator and subsequent division of reference frequency by diode and trigger dividers, and by realization of a phase lock loop.
V. A. Labusov1, 2, D. O. Selyunin1, 2, I. A. Zarubin1, 2, and R. G. Gallyamov2 1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2VMK Optoelektronika, Ltd., Novosibirsk, Russia E-mail: labusov@vmk.ru
Pages: 19-26
An automatic system for measuring the quantum efficiency of multielement photodetectors applied in atomic emission spectral analysis is created. Results of measuring the quantum efficiency of BLPP-369 photodiode lines with different dopants and coating layers, and also lines of CCDs (Sony ILX-526A) are presented. It is shown that the quantum efficiency of photodiode lines between 180 and 360 nm is 0.3
A. V. Yartsev
Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia E-mail: jartsev@ngs.ru
Pages: 27-32
Results of measuring the voltage-current characteristics (VCCs) of diodes for IR detectors with the cutoff wavelength lc= 11 mm are presented. The diodes are based on variband Hg0,78Cd0,22Te layers grown by molecular beam epitaxy on semi-insulating GaAs substrates. It is found that diffusion current and generation current in the depletion layer of the p
B. K. Raikov, Yu. N. Sekisov, and V. V. Tulupova
Institute for Control of Complex Systems, Russian Academy of Sciences, Samara, Russia E-mail: sekisov@iccs.ru
Pages: 33-42
A set of conversion functions of a cluster single-coil eddy-current sensor as the sensor inductance dependences on the blade tip coordinate displacement is described. A simplified model of electromagnetic interaction between the sensitive elements and the object simulator, that is, a rectangular plate, is developed. The model ensures calculating the set of conversion functions in an analytical form. Results of calculating the set of conversion functions, which were obtained for the given geometrical parameters of the measurement object, sensor, and current directions of its sensitive elements, are illustrated.
Properties of SISO adaptive stabilization systems with different types of reference model for prescribing dynamic and static characteristics are discussed. The influence of the model structure that forms the input action on the control signal is considered.
A one-step sequential procedure using a special rule of observation accumulation is proposed for estimating the linear parameters of a stable random coefficient autoregressive process. The upper bound for rms precision of a sequential estimate which decreases inversely to the value of the procedure parameter that determines the time of observations is obtained. Asymptotic behavior of the mean time of the procedure is studied. Results of numerical simulations are presented.
