This article deals with two versions of the traveling purchaser problem. In the uncapacitated version, the number of units of a given product available at any market where it is sold is either larger than or equal to the demand. In the capacitated version, the availability may be smaller than the demand. This study extends some known heuristics and presents some new ones capable of solving eith...

In this paper, Exp-function and (G′/G)expansion methods are presented to derive traveling wave solutions for a class of nonlinear space-time fractional differential equations. As a results, some new exact traveling wave solutions are obtained.

Current traveling wave ultrasonic motor (TWUSM) utilizes comb-teeth structure as deflection amplifier. The position of the stator neutral axis to the stator contact surface is one of the factors that influences the deflection amplifier. Stator deflection directly effects on motor performance. In this study, the modification of the comb-teeth stator design is proposed to see its effect on motor ...

The embedded ultrasonic structural radar (EUSR) was developed based on phased array technology. It can interrogate large structural areas from a single location using ultrasonic guided Lamb and Rayleigh waves generated by tuned piezoelectric wafer active sensors (PWAS) that are permanently attached to the structure. This paper brings together several aspects of the implementation and applicatio...

in this article, we apply the multiquadric radial basis function (rbf) interpo-lation method for nding the numerical approximation of traveling wave solu-tions of the kawahara equation. the scheme is based on the crank-nicolsonformulation for space derivative. the performance of the method is shown innumerical examples.

multiple traveling salesman problem (mtsp) is one of the most popular operation research problem and is known as combinatorial optimization problems. mtsp is an extension version of the famous and widely used problem named traveling salesman problem (tsp). because of its benefices in various domains, many researchers have tried to solve that, and many methods have proposed so far. mtsp is a np-...

Piezoelectric wafer active sensors (PWAS) are inexpensive, non-intrusive, unobtrusive devices that can be surface-mounted on existing structures or inserted between the layers of new composite structures. The PWAS can be used in both active and passive modes. PWAS generate and detect Lamb waves and enable the development of embedded NDE concepts. This paper will present two embedded NDE concept...

The significant difference in the ultrasonic velocity of liquid and solid semiconductors has led to an interest in ultrasonic characterization of anisotropic solid-liquid interfaces during semiconductor single-crystal growth. However, the large solid:liquid velocity ratio could result in potentially severe ray bending at the interface and so detailed ray path and wavefront analyses are needed b...

The in situ measurement of thick oil slick thickness (>0.5 mm) and area real time order to estimate the volume an spill is very important for determining response strategy evaluating disposal efficiency. In this article, a method proposed assess slicks by simultaneously measuring using ultrasonic inspection image processing methods, respectively. A remotely operated vehicle (ROV), integratin...

In view of the limitations traditional feeder driving mode in bulk material conveying, a new scheme ultrasonic vibration feeding device with double symmetrical axis structure is proposed based on existing traveling wave conveying device. The outer sides upper and lower straight beam sections vibrator contain convex tooth structures, piezoelectric ceramic sheets are pasted inner side; Based prin...