Dynamic loads of high capacity power grids under normal and severe conditions are the most concerns of system operators and dispatchers to maintain voltage stability. Reactive power (Q) are often drawn by loads from various generated sources disturbing the operational power factor. Compensating methods are used, depending on load types and their reactive power patterns, to continuously monitor and correctly counteract fast changes by extremely rapid VAR compensation especially during transient conditions. Using power electronics and combining both, power and control engineering, some FACTS devises equipped with selected power electronic switching are the appropriate methods to respond to system variations in almost no time. STATCOM regulates system voltages based on a voltage-source converters, by absorbing or generating reactive power. Contrary to a thyristor-based Static VAR

This study aims to investigate the disclosures of corporate social responsibility CSR in the annual reports of the sixty one Libyan companies for six sectors, namely industry, services, investment, banking, insurance and oil. Study periods are three years; 2009, 2010 and 2012. The disclosures of the corporate social responsibility include four themes, namely environment, community, consumers and employees. Content analysis methodology was employed in order to study the disclosures of corporate social responsibility. Disclosure index was used to measure the corporate social responsibility disclosures. The findings revealed although many companies disclosed their corporate social responsibility activities in their annual reports, but the levels of disclosures are still low. Results of the study also indicated that there are slight differences in the disclosures of the corporate social responsibility between different sectors of Libyan companies. It is expected that usefulness of this study will be acknowledged by stakeholders, potential and present investors, policy makers, and regulatory bodies in Libya or by any other developing country. 

The object of the present paper is to introduce a new subclass of p-valent starlike functions with negative coefficients in the open unit disc which is defiined by a generalized derivative operator. We obtain coefficient inequalities, growth and distortion theorems and extreme points for the subclass of p-valent functions.

Recent developments in both information and communication security have heightened interest in enhancing the embedding capacity for data handling techniques. Although many steganographic techniques, in the literature, have been developed for this purpose, most of them distort the quality of the host-signal during data embedding and the changes will be become visible to the human eye especially for those signals distributed via the Internet which must be processed by a low bit rate compression due to bandwidth limitations. Therefore, the challenge is to create a steganographic technique that is able to hide acceptable amount of data without altering the quality of the host-signal. In this paper, pixel-value differencing (PVD) steganographic scheme and its two modified versions, namely, enhanced pixel-value differencing (EPVD) and tri-way pixel-value differencing (TPVD) were implemented, analyzed and compared in terms of invisibility, fidelity and impact of data hiding on the compression efficiency. Experimental results indicate that the EPVD scheme is capable of providing better performance than other compared schemes.

Abstract: Hypertension is a challenge for public health professionals all-over the world. It is the leading and most important modifiable risk factor for coronary heart disease, congestive heart failure, stroke, renal diseases, retinopathy and many other diseases. The aim of the present study is to evaluate and study the most identifiable risk factors for patients with diseases of hypertension and diabetes mellitus such as age, gender, marital status, tobacco smoking, life style and with associated diseases (dyslipidemia and diabetes) treated at city hospital in Tripoli (Tripoli Medical Centre). This was a cross sectional prospective study which was carried out during October 2013 and January 2014. The study included 200 consecutive patients (102 females and 98 males) who are older than 30 years and who came for a regular follow up at the OPD of Tripoli medical centre. During this study, variables like age, gender, diabetes, smoking and dyslipidemia were taken into account in relation to hypertension. In addition, it is assorted some important biochemical parameters such as total cholesterol, triglycerides, low density lipoprotein, high density lipoprotein and fasting blood glucose in the studied population and compared them with available data. The findings revealed that Libyan population not only old age and male gender are potential threat for an early hypertensive but other variables like diabetes, cardiovascular diseases, dyslipidemia, obesity, migraine and obstructive apnea are also playing an important role in hypertension complications. It is concluded that this population is more prone to hyperglycemia and high pulse pressure with hypertension in the majority of survey population

Abstract Mel Frequency Cepstral Coefficients (MFCCs) are the most widely used features in the majority of the speaker and speech recognition applications. Since 1980s, remarkable efforts have been undertaken for the development of these features. Issues such as use suitable spectral estimation methods, design of effective filter banks, and the number of chosen features all play an important role in the performance and robustness of the speech recognition systems. This paper provides an overview of MFCC's enhancement techniques that are applied in speech recognition systems. The details such as accuracy, types of environments, the nature of data, and the number of features are investigated and summarized in the table combined with the corresponding key references. Benefits and drawbacks of these MFCC's enhancement techniques have been discussed. This study will hopefully contribute to raising …