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In this paper we present an approach to optimistic concurrency control where the write phase occurs before the validation phase (RWV instead of RVW). Our work extends earlier research into real-time databases that utilized virtual execution to lower disk access overheads. Such work demonstrated that virtual execution allowed an increase in transactions completing before deadlines expired and improvements in overall throughput. However, we demonstrate that only with the reversal of the write and validation phases can virtual execution reach its full potential.

Abstract: The igneous rock unit of Al-Haruj Al-Aswad were interpreted using satellite image. The satellite image of Land sat bands from one tosevenhas captured by the Thematic Mapper (TM7) scanner. These imageswere processed and interpreted with following standard technique. Karhunen– Loèvetransform were employed to produce principalcomponent images. Then, they were paintedby using RGB color system to produce false color images from principal component images and ratio images. The resulted images were interpreted in the matter of geology of the area.Theprincipalcomponent transformation is helpful in mapping different lava flow phases in the area. This transform have used the correlation between the corresponding pixels in images of different bands. Six lava flow phases was interpreted depends on their color and shade in the processed satellite images. 

Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) are among the common biomarkers which have been investigated in serum of patients suffering from end-stage renal disease (ESRD) and infections of hepatitis B virus (HBV) and hepatitis B virus (HBC). The present study aimed to statistically investigate whether serum levels of those enzymes and their ratio (AST/ALT) vary between hepatitis B and C patients with or without ESRD. Serum levels of AST and ALT were measured in 228 subjects of both genders, and those subjects were included in these groups: HBV and HCV patients, patients suffering from comorbidity of HBV/ESRD and HCV/ESRD as well as healthy subjects representing a control group. Means of serum level of ALT and AST for both genders in all patient groups were higher than that of control group and higher than the upper limit of ALT and AST reference intervals. MANOVA results revealed that group effect on the three variables, AST, ALT and AST/ALT, was significant (p < 0.05). The highest mean difference for ALT, AST and AST/ALT variables were, respectively, control and HBV/ESRD comorbidity groups; control and HCV/ESRD comorbidity groups; control and HBV infection groups. Moreover, it was found that the effect of the interactions between the three independent variables (group, age and gender) was not significant in all patient groups. Patients suffering from viral hepatitis and kidney failure disease will suffer from severe liver failure in an early time.

Keywords:AST, ALT, ESRD, HCV, HBV, MANOVA 

Single carrier with frequency domain equalization (SC/FDE) substantially out performs OFDM in BER performance for Ultra Wideband (UWB), a result already reported. In this paper we provide an explanation and justify this superiority. We showed besides, by only a proper selection of both cyclic prefix duration and the period of fast Fourier transform an extra gain is obtainable. This performance enhancement is in favor of SC/FDE's superiority for UWB in the context of internet of things.

Abstract

The rock units of Wadi El-shati were classified to group of clusters to explain the concentration of iron ore by using enhanced satellite image. The several images of single band of Thematic Mapper (TM7) of Landsat were combined to produce multispectral image bands. It was processed by group of filters after the false color image has been made. The filtered image was classified with unsupervised classification after the image ratio has been done by dividing band 3 on band1. Finally, we reached the classified image has concentration of iron tone.

This paper presents a new high-capacity algorithm for audio watermarking for the purpose of embedding a watermark audio signal into an original audio signal. This algorithm uses DCT (discrete cosine transform) in combination with SVD (singular value decomposition), DWT (discrete wavelet transform), and CZT (chirp ztransform). For the purpose of ensuring high levels of imperceptibility and robustness, a low-frequency sub band of 1-level DWT is selected to embed the watermark, followed by DCT, CZT, and SVD. As a result, the proposed algorithm achieves a high capacity of 352800 bits per second while a good quality audio signal is maintained (having an objective difference grade of more than-0.04). It also provides high imperceptibility (a signal to noise ratio of more than 58 dB) and it is extremely resistant to common audio attacks, including requantizing, resampling, additive white Gaussian noise or AWGN, MP3 compression, and low-pass filtering. The proposed algorithm presents much better compared to the audio watermarking algorithms already existent.

nitriding is a common method for improving the hardness , mechanical properties, wear and corrosion resistance of metals. Laser nitriding of metals is an efficient process, where the irradiation of surfaces in nitrogen atmosphere leads to the fast take-up of nitrogen in the irradiated surfaces. In this paper laser surface nitriding of carbon steel carried out by melting the surface of substrate using high power CW CO2 laser with nitrogen as shrouding environment. Laser tracks were arranged as single tracks with the use of various laser powers ranging from 0.8kW to 2.0 KW , and laser scanning rates from 120mm/min to 200 mm/min. The influence of laser beam power and laser scanning rates on the microstructure and hardness profiles analysed. The laser nitride layer studied using optical microscope, and scanning electron microscope. The laser surface nitriding of carbon steel led to refinement in the microstructure and the diffusion of nitrogen caused the formation of iron nitrides on the surface. The micro hardness of the nitride surface improved to a maximum of 400HV in the present set of laser processing conditions as compared to 150HV of as received substrate as a result of the appearance of marten site in the melted pool and heat effect zon

Prosopis farcta (Banks & Sol.) J. F. Macbr. has been reported for the first time from Libya. This species is native in Asia. Flowering specimens of Prosopis farcta collected from Sokna Region about 650 Km south-east Tripoli. It is presented with updated nomenclature, taxonomic description, geographical distribution, place of occurrence in Libya, and field colored photographs are also provided. The voucher specimens were deposited in the Herbarium of Botany Department (ULT), University of , Tripoli, Libya.

The term “gel” is commonly used to refer to the defect that distorts a film product. Eliminating gel defects from polyolefin film products can be difficult, time-consuming, and expensive. The impact of crystallization in the blown film matrix of high-density polyethylene (HDPE) was investigated by scanning electron microscope (SEM). Unmelted spots (gels) in the films for both compared HDPEs were tested. Tensile strength and elongation percentage of films made with hexene is higher than for the films made with butene. The gels were bigger in size and higher in density in Lanufene® than in the Equate product. It was found that this gel was affected the mechanical and physical properties of the locally produced HDPE film. The flow that takes place in a melt flow index (MFI) experiment has been simulated for Lanufene® and Equategrades. The high MI enables the grade to be fit into the injection molding process. The melt index and melt flow index of Lanufene® are higher than the Equate product, while the melt flow ratio and density are lower. The percentage of Nu, Si, Cr, Al, C, and Fe in the gels determined by SEM was found to be higher in Lanufene® than Equate, except for the carbon element. Keywords: gel, HDPE film, crystallization, Lanufene®, Equate, scanning microscope