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Search Results: 1 - 10 of 249621 matches for " Yu D "
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Performance and Challenges in Utilizing Non-Intrusive Sensors for Traffic Data Collection  [PDF]
Xin Yu, Panos D. Prevedouros
Advances in Remote Sensing (ARS) , 2013, DOI: 10.4236/ars.2013.22006
Abstract:

Extensive field tests of non-intrusive sensors for traffic volume, speed and classification detection were conducted under a variety of traffic composition and road width conditions. The accuracy challenges of utilizing non-intrusive sensors for traffic data collection were studied. Both fixed and portable sensors with infrared, microwave and image recognition technologies were tested. Most sensors obtained accurate or fairly accurate measurements of volume and speed, but vehicle classification counts were problematic even when classes were reduced to 3 to 5 compared to FHWA’s 13-class standard scheme.

Finite Element Analysis of Sound Transmission Loss in One-Dimensional Solids  [PDF]
S. D. Yu, J. G. Kawall
Open Journal of Acoustics (OJA) , 2013, DOI: 10.4236/oja.2013.34017
Abstract:

A higher-order acoustic-displacement based finite element procedure is presented in this paper to investigate one-dimensional sound propagation through a solid and the associated transmission loss. The acoustic system consists of columns of standard air and a solid, with the upstream column of air subjected to a sinusoidal sound source. The longitudinal wave propagation in each medium is modeled using three-node finite elements. At the interfaces between the air and the solid medium, the continuity in acoustic displacements and the force equilibrium conditions are enforced. The Lagrange multipliers method is utilized to assemble the global equations of motion for the acoustic system. Numerical results obtained for various test cases using the procedure described in the paper are in excellent agreement with the analytical solutions and other independent solutions available in the literature.

The 5-dimensional model for electromagnetism and gravity  [PDF]
V. A. Andreev, D. Yu. Tsipenyuk
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.64028
Abstract:

The generalization of Einstein’s special theory of relativity (SRT) is proposed. In this model, the possibility of unification of scalar gravity and electromagnetism into a single unified field is considered. Formally, the generalization of the SRT is that instead of (1+3)-dimensional Minkowski space the (1+4)-dimensional extension G is considered. As the fifth additional coordinate the interval S is used. This value is saved under the usual Lorentz transformations in Minkowski space M, but it changes when the transformations in the extended space G are used. We call this model the extended space model (ESM). From a physical point of view, our expansion means that processes in which the rest mass of the particles changes are acceptable now. If the rest mass of a particle does not change and the physical quantities do not depend on an additional variable S, then the electromagnetic and gravitational fields exist independently of each other. But if the rest mass is variable and there is a dependence on S, then these two fields are combined into a single unified field. In the extended space model a photon can have a nonzero mass and this mass can be either positive or negative. In this model the 5- vectors which components correspond to energy, pulse and mass of a particle are isotropic both for massive and massless particles. The rotations in the (1+4) dimensional extended space G can transform massive particles into massless and vice versa.

The Mass and Size of Photons in the 5-Dimensional Extended Space Model  [PDF]
V. A. Andreev, D. Yu. Tsipenyuk
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.711116
Abstract: We propose the generalization of Einstein’s special theory of relativity (STR). In our model, we use the (1 + 4)-dimensional space G, which is the extension of the (1 + 3)-dimensional Minkowski space M. As a fifth additional coordinate, the interval S is used. This value is constant under the usual Lorentz transformations in M, but it changes when the transformations in the extended space G are used. We call this model the Extended space model (ESM). From a physical point of view, our expansion means that processes in which the rest mass of the particles changes are acceptable now. In the ESM, gravity and electromagnetism are combined in one field. In the ESM, a photon can have a nonzero mass and this mass can be either positive or negative. It is also possible to establish in the frame of ESM connection between mass of a particle and its size.
Super giant endogenic ore deposits as a result of the crust-mantle interaction in the mantle
Yu. D. Pushkarev
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891551
Abstract:
Model-based fault detection for proton exchange membrane fuel cell systems
MMd Kamal, D Yu
International Journal of Engineering, Science and Technology , 2011,
Abstract: In this paper, an intelligent model-based fault detection (FD) is developed for proton exchange membrane fuel cell (PEMFC) dynamic systems using an independent radial basis function (RBF) networks. The novelty is that this RBF networks is used to model the PEMFC dynamic systems and residuals are generated based on the differences between the PEMFC systems and RBF networks model. Later, based on this information the RBF model performed the FD including identification and classification. Five types of faults have been introduced to the PEMFC dynamic systems which occurred in the actuator, component and three sensors part. By considering the faults in the PEMFC systems is 10% changes in each component, the efficiency of the proposed model is studied. The developed model is tested on MATLAB/Simulink simulation. The results show that all the simulated faults can clearly be detected and classified by this intelligent model-based FD. By using this intelligent FD method, the PEMFC dynamic systems is intelligent to detect the faults quickly, classify them and then appropriate action can be taken immediately.
Spatial structure and dispersion of drift mirror waves coupled with Alfvén waves in a 1-D inhomogeneous plasma
D. Yu. Klimushkin
Annales Geophysicae (ANGEO) , 2006,
Abstract: The paper employs the frame of a 1-D inhomogeneous model of space plasma,to examine the spatial structure and growth rate of drift mirror modes, often suggested for interpreting some oscillation types in space plasma. Owing to its coupling with the Alfvén mode, the drift mirror mode attains dispersion across magnetic shells (dependence of the frequency on the wave-vector's radial component, kr). The spatial structure of a mode confined across magnetic shells is studied. The scale of spatial localization of the wave is shown to be determined by the plasma inhomogeneity scale and by the azimuthal component of the wave vector. The wave propagates across magnetic shells, its amplitude modulated along the radial coordinate by the Gauss function. Coupling with the Alfvén mode strongly influences the growth rate of the drift mirror instability. The mirror mode can only exist in a narrow range of parameters. In the general case, the mode represents an Alfvén wave modified by plasma inhomogeneity.
Asymptotic approximation of a solution of a quasilinear parabolic boundaryvalue problem in a two-level thick junction of type 3:2:2
D. Yu. Sadovyj
Matematychni Studii , 2012,
Abstract: We consider a quasilinear parabolic boundary-value problem in a two-level thick junction Ω ε of type 3:2:2 , which is the union of a cylinder Ω 0 and a large number of ε -periodically situated thin discs with variable thickness. Different Robin boundary conditions with perturbed parameters are given on the surfaces of the thin discs. The leading terms of the asymptotic expansion are constructed and the corresponding estimate in Sobolev space is obtained.
On the new habitats of Gypsophila paniculata L. in the Kaliningrad region
Feschenko Yu.,Petrenko D.
Vestnik Immanuel Kant Baltic Federal University , 2013,
Abstract: This article offers data on the new cenopopulation of Gypsophila paniculata L. discovered in the Kaliningrad Region, its structure and current state.
Remote research on the variability of the thermokarst lake shorelines in the Altai permafrost region
Polischuk Yu.,Sharonov D.
Vestnik Immanuel Kant Baltic Federal University , 2013,
Abstract: This article presents a study into the shape variation of thermokarst lakes coastal boundaries carried out on six test sites in Eshtykol in the Altai Mountains. The authors describe the methodological issues of the statistical analysis of lake boundary variability with the help of satellite images. The authors show that the degree of lake shoreline variability is increasing with time. The study results can be used in modeling the fields of thermokarst lakes and research on thermokarst dynamics on permafrost territories in the conditions of climatic changes.
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