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A b s t r a c t. The complex permittivity of fresh juice of two cultivars of grapes, Sultania (green grapes) and Black Monukka (black grapes) was measured in terms of the dielectric constant and dielectric loss factor over the frequency range from 1 to 50 GHz and at temperatures ranging from 30 to 60 o C, by using the PNA network analyzer model E8364C and open ended coaxial probe 85070E. The Cole-Cole plots and dielectric constant vs. (angular frequency) dielectric loss factor and dielectric constant vs. dielectric loss factor/(angular frequency) regression lines at different temperatures were used in Debye approximation to predict relaxation frequency of molecules for the two cultivars of grapes in the low frequency and high frequency limits, respectively. It was observed that the acidic character of green grapes is responsible for the large amplitude vibrational peaks in dielectric loss factor -frequency curves, in the high frequency region at higher temperatures. On the other hand, excess of sugar in black grapes suppresses the activity of water molecules, thereby suppressing the vibrational peaks at higher frequencies. Different relaxation frequencies found for the two cultivars of grapes suggest that they have different molecular structure.K e y w o r d s: dielectric constant, dielectric loss factor, relaxation frequency, temperature, grapes INTRODUCTION

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Retrieving results from the cache is one of the prominent techniques to improve the query response time and reducing load on the back-end database servers. One of the important factors that influences the performance of cache system the most, is the size of the cache. In cloud-based systems, memory is scalable and hence, size of the cache is not a critical issue. However, when the cache is overpopulated with queries and their results, in that case, the query response time increases. This is due to the fact that time for searching the cache for the desired results increases. In this paper, an appropriate cache size is calculated in terms of the number of queries, for the database-size under consideration. This paper also describes the set-up of Virtual Machine Creation (VMC) cloud, using Cloud Virtual Machine Creation (CVMC) algorithm. This facilitates the deployment of database in cloud-based systems. An appropriate cache-size for cloud-based system is determined through experimentation using Apache HBase.