bluuebunny/crossref_metadata_2025 huggingface dataset:
How Expensive Is Expensive Enough? Opportunities for Cost Reductions in Offshore Wind Energy Logistics
Authors: Poulsen Thomas , Hasager Charlotte
Published: June 2016

This paper reveals that logistics may conservatively amount to 18% of the levelized cost of energy for offshore wind farms. This is the key finding from an extensive case study carried out within the organization of the world’s leading offshore wind farm developer and operator. The case study aimed to, and produced, a number of possible opportunities for offshore wind cost reductions through logistics innovation; however, within the case study company, no company-wide logistics organization existed to focus horizontally on reducing logistics costs in general. Logistics was not well defined within the case study company, and a logistics strategy did not exist. With full life-cycle costs of offshore wind farms still high enough to present a political challenge within the European Union in terms of legislation to ensure offshore wind diffusion beyond 2020, our research presents logistics as a next frontier for offshore wind constituencies. This important area of the supply chain is ripe to academically and professionally cultivate and harvest in terms of offshore wind energy cost reductions. Our paper suggests that a focused organizational approach for logistics both horizontally and vertically within the company organizations could be the way forward, coupled with a long-term legislative environment to enable the necessary investments in logistics assets and transport equipment.
Neonatal Heart-Enriched miR-708 Promotes Differentiation of Cardiac Progenitor Cells in Rats
Authors: Deng Shengqiong , Zhao Qian , Zhou Xianjin , Zhang Lin , Bao Luer , Zhen Lixiao , Zhang Yuzhen , Fan Huimin , Liu Zhongmin , Yu Zuoren
Published: June 2016

Cardiovascular disease is becoming the leading cause of death throughout the world. However, adult hearts have limited potential for regeneration after pathological injury, partly due to the quiescent status of stem/progenitor cells. Reactivation of cardiac stem/progenitor cells to create more myocyte progeny is one of the key steps in the regeneration of a damaged heart. In this study, miR-708 was identified to be enriched in the neonatal cardiomyocytes of rats, but this has not yet been proven in adult humans. A lower level of miR-708 in c-kit(+) stem/progenitor cells was detected compared to non-progenitors. Overexpression of miR-708 induced cardiomyocyte differentiation of cardiac stem/progenitor cells. This finding strengthened the potential of applying miRNAs in the regeneration of injured hearts, and this indicates that miR-708 could be a novel candidate for treatment of heart diseases.
Cancer Stem Cells: The Potential Targets of Chinese Medicines and Their Active Compounds
Authors: Hong Ming , Tan Hor , Li Sha , Cheung Fan , Wang Ning , Nagamatsu Tadashi , Feng Yibin
Published: June 2016

The pivotal role of cancer stem cells (CSCs) in the initiation and progression of malignancies has been rigorously validated, and the specific methods for identifying and isolating the CSCs from the parental cancer population have also been rapidly developed in recent years. This review aims to provide an overview of recent research progress of Chinese medicines (CMs) and their active compounds in inhibiting tumor progression by targeting CSCs. A great deal of CMs and their active compounds, such as Antrodia camphorate, berberine, resveratrol, and curcumin have been shown to regress CSCs, in terms of reversing drug resistance, inducing cell death and inhibiting cell proliferation as well as metastasis. Furthermore, one of the active compounds in coptis, berbamine may inhibit tumor progression by modulating microRNAs to regulate CSCs. The underlying molecular mechanisms and related signaling pathways involved in these processes were also discussed and concluded in this paper. Overall, the use of CMs and their active compounds may be a promising therapeutic strategy to eradicate cancer by targeting CSCs. However, further studies are needed to clarify the potential of clinical application of CMs and their active compounds as complementary and alternative therapy in this field.
A Systematic Comparison of Purification and Normalization Protocols for Quantitative MicroRNA Expressional Profiling in Insulin-Producing Cells
Authors: Vestergaard Anna , Blankestijn Maaike , Stahl Jonathan , Pallesen Emil , Bang-Berthelsen Claus , Pociot Flemming , Novotny Guy , Lundh Morten , Mandrup-Poulsen Thomas
Published: June 2016

As microRNAs (miRs) are gaining increasing attention as key regulators of cellular processes, expressional quantification is widely applied. However, in the processing of relatively quantified data, the importance of testing the stability of several reference mRNAs and/or miRs and choosing among these for normalization is often overlooked, potentially leading to biased results. Here, we have optimized the purification of miR-enriched total RNA from pancreatic insulin-producing INS-1 cells. Additionally, we optimized and analyzed miR expression by a qPCR-based microarray and by specific qPCR and tested the stability of candidate reference mRNAs and miRs. Hence, this study gives a widely applicable example on how to easily and systematically test and decide how to normalize miR quantification. We suggest that caution in the interpretation of miR quantification studies that do not comprise stability analysis should be exerted.
Functional Characterization of Soybean Glyma04g39610 as a Brassinosteroid Receptor Gene and Evolutionary Analysis of Soybean Brassinosteroid Receptors
Authors: Peng Suna , Tao Ping , Xu Feng , Wu Aiping , Huo Weige , Wang Jinxiang
Published: June 2016

Brassinosteroids (BR) play important roles in plant growth and development. Although BR receptors have been intensively studied in Arabidopsis, the BR receptors in soybean remain largely unknown. Here, in addition to the known receptor gene Glyma06g15270 (GmBRI1a), we identified five putative BR receptor genes in the soybean genome: GmBRI1b, GmBRL1a, GmBRL1b, GmBRL2a, and GmBRL2b. Analysis of their expression patterns by quantitative real-time PCR showed that they are ubiquitously expressed in primary roots, lateral roots, stems, leaves, and hypocotyls. We used rapid amplification of cDNA ends (RACE) to clone GmBRI1b (Glyma04g39160), and found that the predicted amino acid sequence of GmBRI1b showed high similarity to those of AtBRI1 and pea PsBRI1. Structural modeling of the ectodomain also demonstrated similarities between the BR receptors of soybean and Arabidopsis. GFP-fusion experiments verified that GmBRI1b localizes to the cell membrane. We also explored GmBRI1b function in Arabidopsis through complementation experiments. Ectopic over-expression of GmBRI1b in Arabidopsis BR receptor loss-of-function mutant (bri1-5 bak1-1D) restored hypocotyl growth in etiolated seedlings; increased the growth of stems, leaves, and siliques in light; and rescued the developmental defects in leaves of the bri1-6 mutant, and complemented the responses of BR biosynthesis-related genes in the bri1-5 bak1-D mutant grown in light. Bioinformatics analysis demonstrated that the six BR receptor genes in soybean resulted from three gene duplication events during evolution. Phylogenetic analysis classified the BR receptors in dicots and monocots into three subclades. Estimation of the synonymous (Ks) and the nonsynonymous substitution rate (Ka) and selection pressure (Ka/Ks) revealed that the Ka/Ks of BR receptor genes from dicots and monocots were less than 1.0, indicating that BR receptor genes in plants experienced purifying selection during evolution.
Optimized Distributed Hyperparameter Search and Simulation for Lung Texture Classification in CT Using Hadoop
Authors: Schaer Roger , Müller Henning , Depeursinge Adrien
Published: June 2016

Many medical image analysis tasks require complex learning strategies to reach a quality of image-based decision support that is sufficient in clinical practice. The analysis of medical texture in tomographic images, for example of lung tissue, is no exception. Via a learning framework, very good classification accuracy can be obtained, but several parameters need to be optimized. This article describes a practical framework for efficient distributed parameter optimization. The proposed solutions are applicable for many research groups with heterogeneous computing infrastructures and for various machine learning algorithms. These infrastructures can easily be connected via distributed computation frameworks. We use the Hadoop framework to run and distribute both grid and random search strategies for hyperparameter optimization and cross-validations on a cluster of 21 nodes composed of desktop computers and servers. We show that significant speedups of up to 364× compared to a serial execution can be achieved using our in-house Hadoop cluster by distributing the computation and automatically pruning the search space while still identifying the best-performing parameter combinations. To the best of our knowledge, this is the first article presenting practical results in detail for complex data analysis tasks on such a heterogeneous infrastructure together with a linked simulation framework that allows for computing resource planning. The results are directly applicable in many scenarios and allow implementing an efficient and effective strategy for medical (image) data analysis and related learning approaches.
Dynamic Analysis of Semi-Rigid Frames
Authors: Ozturk Ali , Catal Hikmet
Published: June 2016

The dynamic response of semi-rigid frames is studied by using a computer program. The connection flexibility is modeled by linear elastic rotational springs. Having the same geometry and cross-section; semi-rigid frames, with different spring coefficients, are examined. The reducing coefficients and lateral rigidity values, representing the real behavior of frames, are determined for each frame. To represent the real behavior, all deformations of a frame are accounted for a dynamic analysis. Response characteristics of five different multistory frames are compared with reference to their modal attributes. The study indicates that connection flexibility tends to increase vibration periods, especially in lower modes, while it causes vibration frequencies decrease.
Penalty Function Methods for Constrained Optimization with Genetic Algorithms
Authors: Yeniay Özgür
Published: June 2016

Genetic Algorithms are most directly suited to unconstrained optimization. Application of Genetic Algorithms to constrained optimization problems is often a challenging effort. Several methods have been proposed for handling constraints. The most common method in Genetic Algorithms to handle constraints is to use penalty functions. In this paper, we present these penalty-based methods and discuss their strengths and weaknesses.
Modified LSM for Calibration of Measuring Apparatus
Authors: Hajiyev Chingiz
Published: June 2016

Modified least squares method (LSM) is developed that take into account errors in input standard signals for calibration of measuring devices. Calibration of the differential pressure gage by the standard control-point setting mechanisms is demonstrated in the paper as an example. The accuracy of the coefficient estimates changes when the errors of the control-point setting mechanisms are taken into account. Using the LSM in the classic form for the mentioned case gives wrong estimation errors in the final estimations of calibration curve coefficients. Therefore, for estimation of errors, characteristics of fractional errors are proposed use and as a variance of estimations errors guarantee the stability of the final estimation values.
Dynamic System Modeling Using Rules3 Induction Algorithm
Authors: Aksoy M.
Published: June 2016

This paper describes the use of a new induction algorithm to derive production rules for modelling dynamic systems. The algorithm, called RULES-3, is an efficient tool for extracting a compact set of IF-THEN rules from a collection of examples to classify objects into known categories. The paper summarises the operation of RULES-3 and presents the results obtained in the modelling of two linear systems and two non-linear systems.
Hyperbolic Sine and Cosine Rules for Geodesic Triangles on the Hyperbolic Unit Sphere \(H_{0}^{2}\)
Authors: Özdemir A. , Kazaz M.
Published: June 2016

In plane Lorentzian geometry it is studied points, timelike, spacelike and lightlike lines, triangles, etc [4]. On the hyperbolic sphere, there are points, but there are no straight lines, at least not in the usual sense. However, straight timelike lines in the Lorentzian plane are characterized by the fact that they are the shortest paths between points. The curves on the hyperbolic sphere with the same property are hyperbolic circles. Thus it is natural to use these circles as replacements for timelike lines. The formulas for the sine and cosine rules are given for the Euclidean sphere 2 S [2, 3, 6] and hyperbolic sphere [5]. In this study, we obtained formulas related with the spacelike angles and hyperbolic angles corresponding to the sides of geodesic triangles on hyperbolic unit sphere \(H_{0}^{2}\).
Evaluation of Certain Class of Eulerian Integrals of Multivariable Sister Celine’s Polynomials
Authors: Shrivastava HSP
Published: June 2016

In this paper, we evaluate a key Eulerian integral involving Sister Celine's polynomials of several complex variables defines by the author. Our general Eulerian intergral formula are shown to provide the key formula from which numerous other potentially useful results involving polynomials such as Jacobi, Laguerre, Hermite, Bessel, Bateman, Rice etc and also discrete polynomials like Hahn, Krawtchouk, Pasternak, Meixner, Poisson-Charlier are derived.
Stochastic Approximation with Compound Delayed Observations
Authors: Mahmoud M. , Rasha A.
Published: June 2016

The Robbins-Monro stochastic approximation procedure is modified so as to be applicable in the presence of compound delayed observations. The efficiency of the modified procedure is investigated. The asymptotic values of the efficiency are compared with those obtained by an approximation based on geometric distribution.
Direct Excitation of H(2P) Atoms due to Collisions with Protons and Antiprotons
Authors: El- Naqeeb Thanaa , Tantawi Reda
Published: June 2016

Excitation of hydrogen atoms, being initially in the excited 2p state by colliding with protons (p) and antiprotons (p) is investigated within the impact parameter method. The calculation involves the n = 1,2,3,4 states of the target in addition to considers previously, in an incident energy range from 3 keV to 1000 keV. The effect of the electric charge of the projectile on the collision is discussed.
Coupling of Finite and Boundary Element Methods with Incompatible Interfaces
Authors: Guzelbey Ibrahim , Kanber Bahattin , Erklig Ahmet
Published: June 2016

In this study, an algorithm is presented for the coupling of finite and boundary element method with incompatible interfaces for two dimensional elasticity problems. In this approach, the number of nodes at the interface line of finite element domain can be different from the number of nodes at the interface line of boundary element region. The subregion technique has been used to obtain the coupling model and the compatibility requirement is satisfied by distributing the forces for incompatible interface. The continuity requirement is satisfied by interpolation equations. After satisfying the continuity and compatibility requirements at the interface line, the distribution matrix has been used for transformation of nodal forces into nodal tractions. Two different case studies have been solved and the results are compared with each other, FEM, BEM, ANSYS.
Weyl Manifolds with Semi-Symmetric Connection
Authors: Ünal Füsun , Uysal Aynur
Published: June 2016

We define a semi-symmetric connection on a Weyl manifold and study projective curvature tensor and conformal curvature tensor after giving some properties of the curvature tensor with respect to semi-symmetric connection.
An Investigation of the Gamow-Teller 1+ States in 90Nb Isotopes
Authors: Babacan Tahsin , Salamov Djavad , Küçükbursa Atalay
Published: June 2016

In this study, based on Pyatov-Salamov method, the properties of the Gamow-Teller(GT) 1+ states in 90 Nb have been investigated and the agreement of our results calculated by this method for the energy of Gamow-Teller Resonance (GTR) and the corresponding strengths of the 1+ excitations in 90Nb with the experimental values has been tested. As a result of the calculations, it was seen that the calculated values for the energy and strength of the GTR are sufficiently in agreement with the experimental ones.
The Overall Assurance Interval for the Non-Archimedean Epsilon in DEA Models
Authors: Daneshian B. , Jahanshahloo G. , Lotfi F. , Allahviranloo T. , Mehrabian S.
Published: June 2016

Mehrabian, et. al. (1998) presented a procedure for determining overall assurance interval of ε. Solving n linear programs are needed for this propose, where n is the number of Decision Making Units involved in the evaluation. This paper proposes an efficient algorithm that can determine the overall assurance interval of ε by solving a few number of linear programs.
Procedures for Aircraft Gate Assigment
Authors: Bolat Ahmet , As-Saifan Khaled
Published: June 2016

The task of assigning arriving flights to the available gates at an airport can have a major impact on the efficiency with which the flight schedules are maintained and on the level of passenger satisfaction. In this paper, optimum and heuristic procedures are developed to assign flights in such a way that the idle periods, during which gates are not utilized,. are distributed as uniformly as possible. Emprical study indicates that up to 60% improvements can be achieved over the current practice.
The Effects of Addendum Modification Coefficient on Tooth Stresses of Spur Gear
Authors: Günay Durmuş , Özer Halil , Aydemir Alpay
Published: June 2016

The effects of addendum modification coefficient on the root stresses of spur gear are investigated. By considering positive and negative addendum modificated gears, distributions of root stresses are determined by the finite element method. The root stresses of addendum modificated gears are compared with those of standard gears. The problem is analyzed as one in the plane stress and, also the plane strain.
Satisfaction of Boundary Conditions on Complex Channel Walls with Quadratic Minimizaion Method
Authors: Kent E.
Published: June 2016

Numerical analysis of cellular two-dimensional Stokes flow induced by rotation of a circular cylinder in a V-shaped channel bounded by a cylindrical surface has been made. In the numerical calculations, series in terms of polar coordinates are used to represent the stream function and quadratic minimization method is employed to satisfy the outer boundary conditions on the channel walls. Numerical results are presented in the form of streamline patterns.
Active and Reactive Power Adjustment of a Synchronous Generator Connected to Infinite Bus System by Fuzzy Logic Controller
Authors: Tanrıöven Muğdeşem , Gökalp Erdin , Kocatepe Celal
Published: June 2016

The fuzzy logic controller based on the fuzzy set theory provides a useful tool for converting the linguistic control from the expert knowledge into automatic control rules [1]. By using fuzzy automatic rules from the heuristic or mathematical strategies, complex processes can be controlled effectively in many situations. But the most important and difficult point is how to obtain the proper control rules for a given system. In this study, active and reactive power control of a generator connected to infinite bus system was fulfilled effectively by the fuzzy logic controller. And the software of the system's simulation results were given.
Nonlinear Structural Response of Laminated Composite Panels Subjected to Blast Loadings
Authors: Türkmen Halit , Mecitoğlu Zahit , Borat Oğuz
Published: June 2016

'This paper presents a theoretical analysis and correlation with numerical results of the displacement time histories of laminated composite panels exposed to normal blast shock waves. Nonlinear dynamic equations of the cylindrically curved laminated panels are derived by the use of the Lagrange equations in the frame of Love's theory of thin shells. The governing equations of the laminated curved panel are solved by Runge-Kutta method. In addition, ANSYS finite element software is used to obtain displacement time history numerically. The effect ofloading conditions and geometrical properties is examined on the dynamic behavior.
Determination of Mathematical Model of Electric Power System Using Linear Graph
Authors: Ünal Adem
Published: June 2016

The transformation of a physical system to mathematical base is very important due to analysis of the systems behaviour. In this study an electric power system is considered, and this system is characterized with first-order differantial eqautions therefore stateequations which define behaviour of the system for any instant "t" are obtained.
Improved Part Modeling in a Process Planning System
Authors: Çalışkan Ali , Tantay Bahadlr , Yağcı Filiz
Published: June 2016

An expert process planning and fixturing system described in [14] is improved here by applying Boolean operations. This system uses forward planning strategy, i.e. begins with the blank part and applies some operations for each face or feature until reaching the finished part. This paper is focused on finished and intermediate part modeling within the process planning system by geometric transformations and Boolean operations.
A New Algorithm to Obtain δ-Operator Based Transfer Function From Its Continuous Time Counterpart
Authors: Gundogdu Omer
Published: June 2016

This paper discusses the advantages of the δ-operator over the forward shift operator q in implementation of discrete-time systems. The δ-operator gives better coemcient representation and less round-off noise in many cases. As an application, a new algorithm is introduced here to obtain δ-operator based transfer functions from continuous time counterparts, Finally, a ourth-order Butterworth low-pass filter is taken as an example tocompare coeffcient sensitivity effects of q- and δ-operator systems.
The Frenet and Darboux Instantaneous Rotation for Curves on Space-Like Surface
Authors: Kılıç Osman , Çalışkan Ali
Published: June 2016

In this paper , considering the Darboux instantaneous rotation vector of a solid perpendicular trihedron in the Minkowski 3-space R13, the Frenet instantaneous rotation vector was stated for the Frenet trihedron of a space -like space curve (c) with the binormal b being a time-like vector. The Darboux derivative formulas and the Darboux instantaneous rotation vector were found when the curve (c) is on a space -like surface. A fundamental relation, as a base for the geometry of space-like surfaces, was obtained among the Darboux vectors of the parameter curves (c1) , (c2) and an arbitrary curve (c) on a space-like surface.
Buckling of Heavy Bars
Authors: Özdamar Ing.
Published: June 2016

The calculation for the buckling of a short bar under compression occurs normally through the neglect of its own weight. This method is no longer permissible for long heavy bars. In this case, the net weight must be taken into consideration. Such long heavy bars can be found, for example, as drilling-risers in ocean exploration technology, as schafts in mining, as steel turrets for the production of energy and as naturally grown mammoth trees.In this paper, the critical buckling forces are derived from ten end conditions for heavy bars which are surrounded by air and burdened by compression. There is an analytical solution to the differential equation of the problem which requires a numerical evaluation. Limited computer capacity permits calculations of critical buckling forces only up to a certain length. An analytical solution to the differential equation must be developed asymptotically for long heavy bars. With the help of this asymptotic evaluation, the critical buckling forces for long heavy bars are found.
Finite Element Modeling of Drillstrings
Authors: Yigit A. , Al-Ansary M. , Khalid M.
Published: June 2016

A finite element model is presented for investigating dynamic behavior of drillstrings used in oil and gas wells. A Timoshenko beam element is used to model axial and transverse vibrations. The effect of axial load, gravity, the constraints due to stabilizers are considered. The results show that a small amount of disorder in the configuration as well as the gravity cause strong mode localization which may be catastrophic. The implications for design and operation in the presence of mode localization is also discussed.
On the Properties of a Special Function Defined by an Integral
Authors: Erdoğan M. Emin , İmrak C. Erdem
Published: June 2016

The properties of a special function which is defined by an integral is presented. The numerical values of this function are tabulated correct to twenty decimal places. The curves of this function and its complementary are plotted. Some properties of this function are investigated.
Dual Minimal Curves
Authors: Çalıskan Ali
Published: June 2016

In this study, a dual minimal curves of a dual unit sphere, and the minimal ruled surfaces corresponding it are defined, and represented that dual unit tangent, binormal and surface normal vectors, related to these, are dual isotropic lines. E.Study theorem is also given, for dual minimal curves, belonging to minimal curves and we give general solution of differential equation of this curves.
A Similarity Solution of Fin Equation with Variable Thermal Conductivity and Heat Transfer Coefficient
Authors: Pakdemirli M. , Şahin A.
Published: June 2016

A nonlinear fin equation in which thermal conductivity is an arbitrary function of temperature and, heat transfer coefficient is an arbitrary function of spatial variable is considered. Scaling transformation is applied to the equations to determine the specific forms of these functions for which the equation admits such type of transformation. It is found that for arbitrary heat conduction function, scaling transformation exists for an inverse square heat transfer coefficient. Selecting also the conductivity as an exponential function, the partial differential equation is transferred to an ordinary differential equation via similarity transformations. The resulting equation is solved numerically and temperature distribution is determined for various heat conductivity parameters.
Elasto-Plastic Thermal Stress Analysis in a Thermoplastic Composite Disc under Uniform Temperature Using FEM
Authors: Sen Faruk , Sayer Metin
Published: June 2016

The aim of this study was to investigate elasto-plastic thermal stresses in a thermoplastic composite disc that is reinforced by steel fibers, curvilinearly. Finite element method (FEM) was used to calculate the thermal stress distribution in the model of composite disc. The solution was performed by ANSYS software code. In order to evaluate the effects of uniform temperature, different values of it were carried out on the model of composite disc, uniformly. Radial and tangential stresses were calculated under a uniform temperature distribution which was selected from 60 C to 120 C. Because of the composite disc having different thermal expansions in radial and tangential directions, thermal stresses were produced in it by the applied uniform temperature values. The magnitude of the tangential stress component for elastic and elasto-plastic solutions was higher than the radial stress component. The radial stress components were obtained as compressive on the inner and outer surfaces. Besides the tangential stress components were calculated as compressive and tensile on the inner and outer surfaces, respectively. The absolute values of it were the highest on the inner surface both radial and tangential directions. The residual stress components also were calculated using elastic and elasto-plastic solution results. The obtained results showed that the positions of the improved thermal stresses and residual stresses were considerably affected increasing uniform temperature value.
Time Dependence of Shell Model Calculations
Authors: Dikmen E.
Published: June 2016

In this study, time dependence of large-scale nuclear shell model calculations in a parallel cluster is investigated. Shell model calculations have been done for the light Sb isotopes by using serial and parallel versions of Drexel University Shell Model (DUSM) code and the time dependence of these calculations are obtained on the local Cyborg Parallel Cluster at Drexel University. Some analyses about what kind of parallel system we need to do the calculations have been done in order to do the nuclear shell model calculations for the other nuclei.
Determination of the Steady State Response of EFEF/VFVF Supported Rectangular Specially Orthotropic Plates
Authors: Altıntaş Gökhan , Bağcı Muhiddin
Published: June 2016

Determination of The Steady State Response of EFEF / VFVF Supported Rectangular Specially Orthotropic Plates is presented. EFEF and VFVF plates, these are rectangular plates with two opposite edges elastically or viscoelastically supported and remaining others free. Using the energy based finite difference method; the problem is modeled by a kind of finite difference element. Due to the significance of the fundamental frequency of the plate, its variation was investigated with respect to mechanical properties of plate material and translational spring coefficient of supports. The steady state response of viscoelastically supported plates was also investigated numerically for various damping coefficients. In the numerical examples, the natural frequency parameters and steady state responses to a sinusoidally varying force are assessed for the fundamental mode. Convergence studies are made. Many new results have been presented. Considered problems are solved within the frame work of Kirchhoff-Love hypothesis.
Comparison of Pressure Distribution in Inclined and Parabolic Slider Bearings
Authors: Bayrakçeken H. , Yürüsoy M.
Published: June 2016

An infinitely wide lubricated slider bearing consisting of connected surfaces with thirtd grade fluid as lubricant is analyzed in the present study. Under the assumptions of the order of magnitudes of the variables, it is seen that only viscous and non-Newtonian terms have significant contributions, whereas inertia terms are negligible. Choosing non-Newtonian effects to be smaller than the viscous effects, analytical and numerical solutions are constructed. To illustrate the mathematical model, the set of equations is to used calculate the pressure for two special forms of the slider bearings, namely inclined and parabolic slider bearings. In these two cases, the variation of pressure, for a range of fluid and bearing parameters is presented. The results are presented both analytically and graphically.
Sobolev’s Method for Hammerstein Integral Equations
Authors: El-Bary A.A.
Published: June 2016

Sobolev’s initial value method is used to solve the Hammerstain equation of the second kind.
Propagation of Cylindrical Shock Waves in a Non-Uniform Rotating Stellar Atmosphere under the Action of Monochromatic Radiation and Gravitation
Authors: Shinde Shilpa
Published: June 2016

A self-similar, theoretical model of propagation of cylindrical shock wave in a magneto- gas dynamic rotating non-uniform atmosphere in the presence of monochromatic radiation and gravitation, is considered. The result discussed depends upon the variations of the flow variables behind the shock, which are displayed graphically. A special case is considered in presence and absence of gravitation along with rotation to observe the influence of gravitation.
Modelling of Microhardness Values by Means of Artificial Neural Networks of Al/Sicp Metal Matrix Composite Material Couples Processed with Diffusion Method
Authors: Taşkın Mustafa , Çalıgülü Ugur
Published: June 2016

In this study, modelling of microhardness values by means of artificial neural networks of Al/SiCp metal matrix composite material couples with diffusion method and manufactured by powder metallurgy process, were obtained using a backpropagation neural network that uses gradient descent learning algorithm. After diffusion bonding and relevant test, to prepare the training and test (checking) set of the network, results were recorded in a file on a computer. Then, the neural network was trained using the prepared training set. At the end of the training process, the test data were used to check the system accuracy. As a result the neural network was found successful in the prediction of modelling of microhardness values of Al/SiCp metal matrix composite material couples processed with diffusion method and behavior.
Computational Modeling of Flow Inside a Diseased Carotid Bifurcation
Authors: Arslan Nurullah
Published: June 2016

One of the leading causes for death after heart diseases and cancer in all over the world is still stroke. Most strokes happen because an artery that carries blood uphill from the heart to the head is clogged. Most of the time, as with heart attacks, the problem is atherosclerosis, hardening of the arteries, calcified buildup of fatty deposits on the vessel wall. The primary troublemaker is the carotid artery, one on each side of the neck, the main thoroughfare for blood to the brain. Only within the last twenty-five years, though, have researchers been able to put their finger on why the carotid is especially susceptible to atherosclerosis. In this study, the fluid dynamic simulations were done in a diseased carotid bifurcation under the steady flow conditions computationally. Reynolds numbers representing the steady flow were 300, 1020 and 1500 for diastolic, average and systolic peak flow represented by pulsatile flow waveform, respectively. In vivo geometry and boundary conditions were obtained from a patient who has stenosis located at external carotid artery (ECA) and internal carotid artery (ICA) of his common carotid artery (CCA). The location of critical flow fields such as low wall shear stress (WSS), stagnation regions and separation regions were detected near the highly stenosed region and at branching region.
A Batch-Arrival Queue with Multiple Servers and Fuzzy Parameters: Parametric Programming Approach
Authors: Ke Jau-Chuan , Huang Hsin-I , Lin Chuen-Horng
Published: June 2016

This work constructs the membership functions of the system characteristics of a batch-arrival queuing system with multiple servers, in which the batch-arrival rate and customer service rate are all fuzzy numbers. The α-cut approach is used to transform a fuzzy queue into a family of conventional crisp queues in this context. By means of the membership functions of the system characteristics, a set of parametric nonlinear programs is developed to describe the family of crisp batch-arrival queues with multiple servers. A numerical example is solved successfully to illustrate the validity of the proposed approach. Because the system characteristics are expressed and governed by the membership functions, the fuzzy batch-arrival queues with multiple servers are represented more accurately and the analytic results are more useful for system designers and practitioners.
Design Optimization of Induction Motor by Genetic Algorithm and Comparison with Existing Motor
Authors: Çunkaş Mehmet , Akkaya Ramazan
Published: June 2016

This paper presents an optimal design method to optimize three-phase induction motor in manufacturing process. The optimally designed motor is compared with an existing motor having the same ratings. The Genetic Algorithm is used for optimization and three objective functions namely torque, efficiency, and cost are considered. The motor design procedure consists of a system of non-linear equations, which imposes induction motor characteristics, motor performance, magnetic stresses and thermal limits. Computer simulation results are given to show the effectiveness of the proposed design process.
Modelling of Effect of Inflow Turbulence on Large Eddy Simulation of Bluff Body Flows
Authors: Tutar M. , Celik  I. , Yavuz I.
Published: June 2016

A random flow generation (RFG) algorithm for a previously established large eddy simulation (LES) code is successfully incorporated into a finite element fluid flow solver to generate the required inflow/initial turbulence boundary conditions for the LES computations of viscous incompressible turbulent flow over a nominally twodimensional circular cylinder at Reynolds number of 140,000. The effect of generated turbulent inflow boundary conditions on the near wake flow and the shear layer and on the prediction of integral flow parameters is studied based on long time average results. No-slip velocity boundary function is used but wall effects are taken into consideration with a near wall modelling methodology based on van Driest Damping approach. The numerical results obtained from simulations are compared with each other and with the experimental data for different turbulent inflow boundary conditions to assess the functionality of the RFG algorithm for the present LES code and hence its influence on the vortex shedding mechanism and the resulting flow field predictions.
An Analytical Model of Mountain Wave for Wind with Shear
Authors: Kumar Naresh
Published: June 2016

A 2-D analytical mesoscale hydrostatic model of a stably stratified orographic barrier has been considered. Expressions for surface pressure perturbation, mountain drag and energy flux across Pirpanjal mountains of Kashmir valley for variable wind have been derived. These are further evaluated for realistic vertical profile of wind and temperature. Also study has been extended to obtain all these parameters for different vertical wind profile.
A Generalized KBM Method for Strongly Nonlinear Oscillators with Slowly Varying Parameters
Authors: Cai Jianping
Published: June 2016

A generalized Krylov-Bogoliubov-Mitropolsky (KBM) method is extended for the study of strongly nonlinear oscillators with slowly varying parameters. The asymptotic amplitude and phase are derived and then the asymptotic solutions of arbitrary order are obtained theoretically. Cubic nonlinear oscillators with polynomial damping are studied in detail. Three examples are considered: a generalized Van der Pol oscillator, a Rayleigh equation and a pendulum with variable length. Comparisons are also made with numerical solutions to show the efficiency and accuracy of the present method.
The Evaluation of Thermal Stresses in Thermoplastic Laminated Composites with Different Square Holes
Authors: Sen Faruk , Toparlı Mustafa , Köksal N. Sinan
Published: June 2016

In this study, a thermal stress analysis was evaluated on symmetric angle-ply laminated thermoplastic composite plates that were having different square hole dimensions. The temperature loading was selected uniformly. Besides, it was applied with various values that were chosen as 50, 60, 70, 80, 90, 100 °C, because of the fact that the effect of increasing uniform temperature on thermal stresses was examined. The width plate-to-the width square hole, a/b, ratios were changed as 2, and 4. Thermoplastic laminated composite plates were assumed to be simple supported. Laminated plates were composed of four orthotropic layers oriented with angle-ply in symmetric manner. The solution was carried out by using ANSYS finite element program. The results were showed in figures depending on applied temperatures, orientations and dimensions of square hole.
A Correspondence Between IBA-I and IBA-II Model and Electromagnetic Transitions of Some Erbium Isotopes
Authors: Yazar Harun , Uluer İhsan
Published: June 2016

Since the lowest levels are symmetric under the interchange of neutrons and protons from calculations in the interacting boson approximation IBA-2 model, IBA-1 model space, in which neutron and proton degrees of freedom are not distinguished can be considered as a subspace of the IBA-2 model space. Using the microscopic background of the IBA-2 model, a correspondence can be established between IBA-1 and IBA-2 model space. Since the space of the IBA-1 model can be regarded as a subspace of the IBA-2 model there is a unique way to “Project” the operators of the IBA-2 model onto those of IBA-1. This projection can be carried out by using the Fspin formalism. In the IBA-2, the lowest states are indeed fully symmetric, the calculations with the help of this projection, we explore the energy levels and the electric quadrupole transition probabilities B(E2;Ii If) and -ray E2/M1 mixing ratios for selected transitions of 166-168Er .Owing to admixtures of non-fully-symmetric states in IBA-2, we renormalized the parameters (ε) and (κ).This is the first time we show that this projection can be applied to some heavier isotopes and the results obtained for 166-168Er isotopes are reasonably in good agreement with the previous experimental values.
Optimal Retailer’s Inventory Policy Under Supplier Credits Linked to Retailer Payment Time
Authors: Huang Yung-Fu , Hsu Kuang-Hua
Published: June 2016

This paper wants to investigate the retailer’s optimal cycle time and optimal payment time under supplier credits including conditionally permissible delay in payments and cash discount depending on retailer payment time. That is, the retailer can obtain fully permissible delay in payments and cash discount if the payment is paid before the period of full delay payments permitted by the supplier. Otherwise, the retailer will just obtain partially permissible delay in payments within the period of partial delay payments permitted by the supplier. The supplier uses this policy to attract retailer to pay the payment as soon as possible to shorten the collection period. One theorem is developed to efficiently determine the optimal replenishment and payment policy for the retailer.
The Use of Artificial Neural Networks in Simulation of Mobile Ground Vehicles
Authors: Göktas Haldun , Çavusoğlu Abdullah , Şen Baha , Toktaş İhsan
Published: June 2016

In this study, we have developed a platform which incorporates Artificial Neural Networks (ANNs) in simulating body dynamics of mobile ground vehicles (e.g. cars). This is a part of our research project in which we plan to provide a platform for educating the driver candidates in virtual environments: where the drivers can be educated fully in “Artificial Cities”. To start with, 6 different makes of cars with different engine properties has been simulated with the appropriate data provided by the manufacturers and rules of physics. A joystick steering wheel has been used to produce the necessary inputs for the ANN based physics engine. To train the network, Scaled Conjugate Gradient (SCG) and Levenberg-Marquardt (LM) learning algorithms and a logistic sigmoid transfer function have been used. The statistical error levels are negligible. The Absolute Fraction of Variance (R2) values for both the training and test data are about 99.999% and the mean error value for both data group is lesser than 0.5%.
Multi-Channel Bi-Level Heterogeneous Servers Bulk Arrival Queueing System with Erlangian Service Time
Authors: Sultan Ahmed
Published: June 2016

An easily applicable algorithm to solve problems involving bulk-arrival queues with a breakdown of one of the heterogeneous servers in case of steady state is introduced. A Monte Carlo study for numerically finding the limiting distribution of the number in the system for the bulk arrival, multi-server queueing model (M[x]/EK/C; C-1/FCFS) with heterogeneous servers is presented. The system consists of servers of varying efficiency. This paper presents multi-channel queue with Poisson arrivals, Erlangian service time distributions in which all servers have equal breakdown chance. Measures of system performance including mean queue length, mean waiting time, and blocking probability are reported. Numerical results are obtained by simulation of the entire system. Examples of extensive numerical results for certain measures of efficiency are presented in tabular and chart form. In all cases, the proposed method is computationally efficient, accurate and reliable for both high and low values of the model parameters.
Recursive Algorithm for Generating Two-Staged Cutting Patterns of Punched Strips
Authors: Cui Yaodong
Published: June 2016

The manufacture of parts made of metal sheet often includes two successive processes: the cutting process at which a guillotine shear cuts the sheet into strips, and the punching process at which a stamping press punches out the blanks from the strips. This paper presents an algorithm for generating optimal two-staged cutting patterns of strips for the cutting process. At the first stage the sheet is divided into segments with parallel cuts. Each segment contains strips with the same length and direction. The segments are cut into strips at the second stage. The algorithm calls a recursion function to determine the optimal strip layouts on segments of various lengths, and calls another recursion function to optimally arrange the segments in the sheet, so that the value of the pattern reaches maximum. The computational results indicate that the algorithm is efficient both in computation time and in material usage.
On the Inventory Model with Two Delaying Barriers
Authors: Unver Ihsan
Published: June 2016

In this paper the process of semi-Markovian random walk with negative drift under angle α (0° < α < 90°), and positive jumps with probability ρ (0 < ρ < 1) having two delaying screens at level zero and a (a > 0) is constructed. The exact expressions for Laplace transforms of the distributions of the first moments in order to reach to these screens by the process and, in particularly, the expectations and the variances of indicated distributions are obtained.
The Study of Dependence of the Radial Parts of 0-→0+ First Forbidden β-Decay Matrix Elements on the Parameters in Woods-Saxon Potential
Authors: Kenar İsmail , Ünlü Serdar , Maraş Ismail
Published: June 2016

In this paper, 0-→0+ first forbidden β-decay matrix elements have been calculated. For 206-214Pb→206-214Bi transitions relativistic M±(ρA,λ=0) and nonrelativistic M±(jA,κ =1,λ=0) matrix elements have been calculated. In this calculations, the eigenfunctions and eigenvalues of Schrodinger equation solved by the more realistic Woods-Saxon potential have been used. The dependence of the radial parts in the matrix elements on the parameters (r0: the radii of nucleus, η: isovector parameter, rc: Coulomb radius and χ diffusion parameter) of Woods-Saxon potential has been investigated.
Numerical Verification and Comparison of Error of Asymptotic Expansion Solution of the Duffing Equation
Authors: Cai Jianping , Chen Shuhui , Yang Cuihong
Published: June 2016

A numerical order verification technique is applied to demonstrate that the asymptotic expansions of solutions of the Duffing equation obtained respectively by the Lindstedt-Poincaré(LP) method and the modified Lindstedt-Poincaré(MLP) method are uniformly valid for small parameter values. A numerical comparison of error shows that the MLP method is valid whereas the LP method is invalid for large parameter values.
Two-Stage Group Sequential Designs for Comparative Clinical Trials
Authors: Bacanlı Sevil , Peker Özgür , Demirhan Yaprak
Published: June 2016

Group sequential designs are widely used in Phase II clinical trials, which are usually undertaken to evaluate the response probability of specific treatment regimen. In most randomized clinical trials with sequential patient entry, fixed sample size design is unjustified on ethical grounds and sequential designs are often impractical. However group sequential designs are generally more practical and they provide much of the saving possible from sequential designs. Optimal restricted two-stage design is the simplest form of a group sequential design. In this study, group sequential design obtained by α*(t) functions characterized using the type-I error probability and optimal restricted two stage design has been compared for the cases that the group sizes are equal. Furthermore, their efficiency regarding fixed sample size design has been calculated and the results have been discussed.