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Search Results: 1 - 10 of 364900 matches for " Oboturova N. P. "
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RESEARCH OF THE CHARACTERISTICS OF ELECTRIC PULSE DISCHARGE IN CHLORIDE SODIUM SOLUTIONS Исследование характеристик электроимпульсного разряда в водных растворах хлористого натрия
Nagdalyan A. A.,Oboturova N. P.,Barybina L. I.,Lukyanchenko P. P.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: Electro physical and energetic properties of electric pulse discharge in various concentration solutions of chloride sodium as the results of the researches are provided in this article. The possibility of applying the Yutkin effect in technological processes of food industry has been reviewed
Some New Estimators of Integrated Volatility  [PDF]
Jaya P. N. Bishwal
Open Journal of Statistics (OJS) , 2011, DOI: 10.4236/ojs.2011.12008
Abstract: We develop higher order accurate estimators of integrated volatility in a stochastic volatility models by using kernel smoothing method and using different weights to kernels. The weights have some relationship to moment problem. As the bandwidth of the kernel vanishes, an estimator of the instantaneous stochastic volatility is obtained. We also develop some new estimators based on smoothing splines.
Location Results for Brace Spacing in Gap Tubular “K” Joints Using FEM  [PDF]
P. N. Jiki
Modern Mechanical Engineering (MME) , 2013, DOI: 10.4236/mme.2013.31007
Abstract:

The 8-node iso-parametric thin shell element was employed in the study of stress concentrations in the welded tubular K joint. Element equilibrium equations were derived using isoparametric formulation based on thin shell theory. After assembly, the resulting system equations were solved using existing fortran programs. Numerical experiments were conducted to isolate and locate ideal gap (positions) for the two braces of the K joint. The nominal stresses were calculated from which stress concentration factors were obtained. The resulting stress concentration factors were presented both as tables and as figures. A good agreement between our solutions and those for model joints in the literature is good and acceptable. It was found that the wider apart the brace spacing is, the weaker the strength of the joint. It was also found that the best location for the braces occurs when the stress level changes sign either from positive to negative or vice versa at a critical sampling point.

The Role of Red Algae in Abrupt Appearance of Animals in the Early Cambrian on Siberian Platform  [PDF]
P. N. Kolosov
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A2008
Abstract:

Calcified rock-forming marine filamented benthic micro- and macrophytes of Dzhelindia Kolosov, 1970 (Figure 1(а)) and Chaptchaica Kolosov, 1975 (Figure 1(b)) genera, thrived in Neoproterozoic (1000-541 million years ago) Siberia together with cyanobacteria. Their belonging to Rhodophyta is well-grounded. These and other Neoproterozoic rodofits, as well as Epiphyton Bornemann 1886 (Figure 1(c)) and other Early Cambrian (541-513 million years ago) benthic algae, oxygenating floor of epicontinental sea basin, formed conditions, favorable for the animals. In combination with other biotic, and such abiotic factors as: equatorial position and tectonic feature of Siberian platform; volcanism; transgression of the sea; diversity of ecologic niches, these conditions were prerequisites of skeleton and shell acquisition by Early Cambrian animals, and as a consequence, accelerated morphologic evolution, increased diversity of taxons of different groups of animals.

Gross alpha and beta activities and trace heavy elemental concentration levels in chemical fertilizers and agricultural farm soils in Nigeria  [PDF]
N. N. Jibiri, K. P. Fasae
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.51012
Abstract:

The gross alpha (α) and beta (β) activities and trace heavy elemental concentrations have been determined in Single Super Phosphate (SSP) and Nitrogen Phosphorous Potassium (NPK) fertilizers samples used for agricultural purposes in Nigeria. Cultivated farm soil samples from two regions (north and south) in the country and samples of phosphate rocks were also analyzed for gross α and β radioactivity and elemental concentrations. The beta activity concentration in the NPK (15-15-15) fertilizers was found to vary from 2410.0 ± 80.0 Bq·kg–1 to 4560 ± 140.0 Bq·kg–1, between 1340.0 ± 70.0 Bq·kg–1 and 1440.0 ± 70.0 Bq

Subterraniphyllum thomasii Elliott, Fossil Calcareous Alga the Evolutionary Link between Geniculate and Nongeniculate Coralline Algae: A Hypothesis  [PDF]
Shyam N. Mude, P. Kundal
Open Journal of Geology (OJG) , 2011, DOI: 10.4236/ojg.2011.13006
Abstract: The Neogene sediments exposed in the Saurashtra region along the southwest coast India, consists of well preserved diversified coralline algae [1-5].The Subterraniphyllum thomasii Elliott, a fossil Calcareous alga has been reported from the Dwarka Formation (Lower to Middle Miocene) from Porbandar area, Saurashtara, Indian subcontinent. This is the first report of Subterraniphyllum thomasii Elliott from Lower-Middle Miocene sediments from the Indian subcontinent; however it has been documented earlier from Late Lutetian sediments of Kuchchh Basin, India. There is a controversy regarding the generic placement of the extinct species Subterraniphyllum thomasii Elliott as distinct genus of the geniculate coralline algae or not i.e. nongeniculate coralline algae [6,7]. However, the present specimens of Subterraniphyllum thomasii Elliott exhibit pinpointing features of both geniculate and nongeniculate coralline algae. Finally on the basis of our observations, we hypothesis that Subterraniphyllum thomasii Elliott may be transitional species and evolutionary link between geniculate and nongeniculate coralline algae.
Generalization of Uniqueness Theorems for Entire and Meromorphic Functions  [PDF]
Harina P. Waghamore, N. Shilpa
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.58118
Abstract:

In this paper, we deal with the uniqueness problems on entire and meromorphic functions con- cerning differential polynomials that share fixed-points. Moreover, we generalise and improve some results of Weichuan Lin, Hongxun Yi, Meng Chao, C. Y. Fang, M. L. Fang and Junfeng xu.

Empirical Mode Decomposition-k Nearest Neighbor Models for Wind Speed Forecasting  [PDF]
Ye Ren, P. N. Suganthan
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24025
Abstract: Hybrid model is a popular forecasting model in renewable energy related forecasting applications.
Wind speed forecasting, as a common application, requires fast and accurate forecasting models. This paper introduces an Empirical Mode Decomposition (EMD) followed by a k Nearest Neighbor (kNN) hybrid model for wind speed forecasting. Two configurations of EMD-kNN are discussed in details: an EMD-kNN-P that applies kNN on each decomposed intrinsic mode function (IMF) and residue for separate modelling and forecasting followed by summation and an EMD-kNN-M that forms a feature vector set from all IMFs and residue followed by a single kNN modelling and forecasting. These two configurations are compared with the persistent model and the conventional kNN model on a wind speed time series dataset from Singapore. The results show that the two EMD-kNN hybrid models have good performance for longer term forecasting and EMD-kNN-M has better performance than EMD-kNN-P for shorter term forecasting.
Damping Factor Estimation of a Flexible-Matrix-Composite Body Pump  [PDF]
N. P. Kumar, H. Ghoneim
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.47009
Abstract:

Two very important factors which determine the effectiveness of a pump are its volumetric and power efficiencies. Yin and Ghoneim constructed a prototype of a Flexible-Matrix-Composite (FMC) body pump with a very high volumetric efficiency or pumping potential (the relative volume reduction due to a relative input stroke). The high volumetric efficiency is attributed to the geometry of the pump’s structure (hyperboloid) as well as the high negative effective Poisson’s ratio of the 3-layer [θ/β/θ] flexible-matrix-composite (carbon/polyurethane) laminate adopted for the body of the pump. However, the power efficiency of the pump was not evaluated. It is the objective of the current paper to obtain an estimate of the power efficiency of the pump. The viscoelastic properties of the 3-layer FMC (carbon/polyurethane) laminate are evaluated experimentally using the Dynamic Mechanical Analyzer (DMA) as well as analytically by applying the correspondence principle together with the micro-mechanics approach. In order to obtain an estimate of the power efficiency of the FMC body pump, the axial and shear loss factors of a laminated infinitely long cylindrical tube as functions of β and θ fiber orientation angles are determined employing the Adam and Bacon approach. The analysis engenders high loss factors (greater than 0.4), which suggests that the power efficiency of the proposed pump using the 3-layer carbon/polyurethane laminate may be low.

Semi Numerical Solution for a Boundary Value Problem  [PDF]
N.P. Pai, N. N. Katagi, Krishna B. Chavaraddi
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.31006
Abstract:

The flow of viscous incompressible fluid through a tube is considered. The similarity transformation is used to reduce the governing equations into nonlinear ordinary differential equation. The solution procedure includes application of long series analysis with polynomial coefficients. The series representing physical parameters (\"\" ) reveal qualitative features which are comparable to pure numerical results. The analysis enables in extending region of validity. A complete description of the solutions is presented.

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