Now nanotechnologies are one of perspective methods of diagnostics in medical practice. Nanoparticles can be used as contrast agents for medical ultrasonic introscopy due to their adhesion to tumor cells and bacteria. The mathematical model of the laser excitation of acoustic signals in a liquid medium with the presence of the nanotubes was developed and numerically studied. Increasing of the level of photo acoustic signal was shown.

Keywords: Opt acoustic effect, nanotubes, and model

  This paper discusses the problem of controlling the characteristics of sonar multibeam receiver antennas. Hydro acoustic means, such as side-scan sonar, profiler, sonar, multibeam sonar, are used extensively for remote determination of the parameters of media for environmental management. In the article the technique of controlling the phase-frequency characteristics of the receiving antennas multibeam echoes sounders. The study method allows the measurement of the phase-frequency characteristics of antennas in a hydro acoustic tank which size is less than length of a near field of the reception aerial.

Keywords: Conservancy, multibeam echo-sounder, seabed research, underwater acoustic

In this paper a form of expression in the matrix to determine the unknown ratios in double rows, appoksimiruyuschih displacement of a point of the middle surface of the shell, which is used in calculating the shell variation-energy method  

Keywords: envelope variation-energy method, the minimum total potential energy of the system, movement, deformation.

In operation the case of distribution of an ultrasonic wave in a water pipe located in the dense ground and subject to activity of radial pressure of a ground is viewed.

Keywords: acoustics, monitoring, ground, distribution, wave, water pipe

  Analysis and evaluation of geological and hydrogeological risks is a special kind of design and survey activities aimed to provide public safety, economyfacilities and the environment within the areas exposed to dangerous geological and engineering-geological processes. The article deals withreduce environmental risksmeasures in case of dangerous geological processes. A variant of engineering-geological zoning of the urban area, depending on the state and properties of the geological environment.

Keywords: ecology, geology, risk

  Analysis and evaluation of geological and hydrogeological risks is a special kind of design and survey activities aimed to provide public safety, economyfacilities and the environment within the areas exposed to dangerous geological and engineering-geological processes. The article deals withreduce environmental risksmeasures in case of dangerous geological processes. A variant of engineering-geological zoning of the urban area, depending on the state and properties of the geological environment.

Keywords: ecology, geology, risk.

Information about authors of issue №4 p.1 (2012)

Keywords: authors

Information about authors of issue №3 (2012)

Keywords: authors

Energy method in the form of Tymoshenko Ritz-solved the problem of stability of a circular cylindrical shell under uniform axial compression. Considered axisymmetric shape shell buckling during buckling and axisymmetric initial state, as well as axisymmetric subcritical state during compression. The resulting solution is exactly consistent with the decision of the Lorentz-Tymoshenko known as a classic. 
Keywords: Skin, sustainability, energy, work, buckling.

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