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Search Results: 1 - 10 of 145264 matches for " Wafaa F. Salem "
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Boards of Directors’ Characteristics and Firm Value: A Comparative Study between Egypt and USA  [PDF]
Wafaa F. Salem, Saad A. Metawe, Amr A. Youssef, Mohamed B. Mohamed
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105323
Abstract:
Purpose This research aims to compare the effect of board of directors’ characteristics on the firm’s value in Egypt as an emerging country and USA as a developed country. Five characteristics have been exposed from the literature review that may influence the enhancement of a firm’s value. In corporate governance, these characteristics are CEO duality, board independence, board size, board meetings and gender diversity. Design The model is developed and 84 Egyptian firms listed on the Egyptian stock exchange and 27 American firms listed on The Dow Jones Industrial Average (DJIA) are utilized in this research for testing this model. The research covers a six-year period (2012-2017). Five main hypotheses and ten sub-hypotheses were derived from the model. GLS regression is used to test these hypotheses. Findings The results of this research revealed that board of directors’ characteristics affects firm value almost in the same way in both Egypt and the USA. The results revealed that board independence, board meetings and gender diversity are positively and significantly related to firm value in both countries. Furthermore, it displayed that board size affected firm value in both the Egyptian and American contexts negatively and significantly. Finally, the results showed that the CEO duality has a positive effect on firm value in the Egyptian setting while it has a negative effect on the firm value in the American setting. This research contributes to the literature on the subject of how corporate governance enhances a firm’s value. Participants in the stock market would benefit from the results when assessing the board of directors’ roles in enhancing the firm’s value. Regulators will be able to use the results of this research to recognize the critical characteristics of corporate governance and to assess the governance practices of the board of directors.
The combination of endoglin and FIB-4 increases the accuracy of detection of hepatic fibrosis in chronic hepatitis C patients  [PDF]
Dawlat Salem, Magdy El-Serafy, Eman Obeida, Wafaa Al-Akel, Maissa El-Raziki, Dina Attia, Mostafa Hassan
Open Journal of Gastroenterology (OJGas) , 2012, DOI: 10.4236/ojgas.2012.22013
Abstract: Background and aim: In patients infected with chronic hepatitis C virus, liver biopsy is the gold standard method of staging fibrosis. Different combinations of serum markers attempted to correlate with hepatic fibrosis in place of liver biopsy and have shown encouraging results. The aim of our study is to evaluate the diagnostic value of endoglin and FIB-4 as non-invasive markers of hepatic fibrosis in HCV patients. Methods: We estimated serum endoglin & FIB-4 index in 40 infected chronic hepatitis C patients. Histological staging of hepatic fibrosis was done according to the METAVIR scoring system. Results: Both endoglin and FIB-4 index showed positive correlation with age and aspartate transaminase and inverse correlation with albumin. The diagnostic performance determined by AUROCs for early fibrosis (≤F2), was 0.868 for endoglin and 0.887 for FIB-4, at cut off va- lues of 5.5 & 0.98 with sensitivity of 64.3% & 82.1%, and specificity of 100% & 85% respectively. For ad-vanced fibrosis (>F2), the AUROC was 0.98 for endoglin and 0.967 for FIB-4, obtained at cut off values of 6.29 & 1.6, with sensitivity of 100% & 91.7%, and specificity of 89.3% & 92.9%, respectively. Conclusion: Both serum endoglin and FIB-4 index are fairly accurate in differentiating stages of hepatic fibrosis; their combination in a single equation enhanced the accuracy of fibrosis detection in chronic HCV patients.
Evaluation of Surface Roughness and Streptococcus mutans Adhesion to Bulk-Fill Resin Composites Polished with Different Systems  [PDF]
Wafaa E. Soliman, Ashraf I. Ali, Walid F. Elkhatib
Advances in Microbiology (AiM) , 2019, DOI: 10.4236/aim.2019.91007
Abstract: Purpose: Bacterial adhesion represents the initial step in biofilm formation, dental caries and decay. This study aimed to evaluate and compare surface roughness and bacterial adhesion to bulk fill resin composites polished with different systems. Methods: Filtek Z350 XT (Incremental-fill resin composite), Filtek Bulk-fill Posterior (Bulk-fill resin composite), and Tetric N Ceram (Bulk-fill resin composite) were used as resin composites. The polishing systems used in this study were Sof-Lex multi-step, PoGo one step, and Mylar strip. Scanning electron microscope (SEM) was used to examine the surface roughness and adhesion of Streptococcus mutans ATCC 25175 standard strain to bulk-fill resin composites. Results: The type of restorative materials did not affect the surface roughness or bacterial adhesion (p > 0.05) but the polishing systems were significant (p < 0.05) influencing factors. Furthermore, Pearson correlation revealed a statistically significant (p < 0.001) association (R = 0.943) between surface roughness and bacterial adhesion to the tested surfaces. Conclusion: Regardless of the restorative material, Mylar polishing system revealed the smoothest surface and the lowest adhesion of S. mutans as compared to Pogo one step and Sof-Lex multi-step polishing systems.
Sustained-release progesterone nanosuspension following intramuscular injection in ovariectomized rats
Heba F Salem
International Journal of Nanomedicine , 2010, DOI: http://dx.doi.org/10.2147/IJN.S12947
Abstract: stained-release progesterone nanosuspension following intramuscular injection in ovariectomized rats Original Research (6138) Total Article Views Authors: Heba F Salem Published Date November 2010 Volume 2010:5 Pages 943 - 954 DOI: http://dx.doi.org/10.2147/IJN.S12947 Heba F Salem Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt Abstract: The production of an intramuscular (IM) injection of natural progesterone would provide a safer solution than using semi synthetic progesterone. However, disadvantages such as low solubility and a short half life prevent the use of natural progesterone. In this study, we formulated a sustained release form of natural progesterone to be given as IM injection. A progesterone nanosuspension (PNS) was first developed and then dispersed in a thermosensitive gel matrix. The selected nanoparticles showed an average particle size of 267 nm and a zeta potential approaching-41 mV. The in vitro release profile of PNS from the F127 plus methyl cellulose gel followed zero order kinetics and correlated linearly with the weight percentage of gel dissolved, demonstrating that the overall rate of release of PNS is controlled by dissolution of the pluronic F127/methyl cellulose (MC) gel (r2 > 0.99). The pharmacokinetic parameters of the PNS (6 mg/mL) in pluronic F127/MC gel were evaluated in comparison with the control progesterone suspension. After the administration of PNS in F127/MC gel into the rats, a maximum serum concentration of 22.1 ± 1.9 ng/mL was reached at a Tmax of 4.05 ± 0.1 h. The terminal half life was 12.7 ± 0.8 h. The area under the curve AUC0-∞ of the injected formula was 452.75 ± 42.8 ng h/mL and the total mean residence time was 18.57 ± 1.44 h. The PNS in gel was significantly different from the control in rate and extent at P < 0.001. The natural progesterone which was nanosized and formulated in a thermosensitive gel significantly sustained the action of natural progesterone so that it could be injected every 36 h instead of every day. Moreover, this formula is expected to provide a much safer choice than the use of semi-synthetic progesterone.
Sustained-release progesterone nanosuspension following intramuscular injection in ovariectomized rats
Heba F Salem
International Journal of Nanomedicine , 2010,
Abstract: Heba F SalemFaculty of Pharmacy, Beni-Suef University, Beni-Suef, EgyptAbstract: The production of an intramuscular (IM) injection of natural progesterone would provide a safer solution than using semi synthetic progesterone. However, disadvantages such as low solubility and a short half life prevent the use of natural progesterone. In this study, we formulated a sustained release form of natural progesterone to be given as IM injection. A progesterone nanosuspension (PNS) was first developed and then dispersed in a thermosensitive gel matrix. The selected nanoparticles showed an average particle size of 267 nm and a zeta potential approaching-41 mV. The in vitro release profile of PNS from the F127 plus methyl cellulose gel followed zero order kinetics and correlated linearly with the weight percentage of gel dissolved, demonstrating that the overall rate of release of PNS is controlled by dissolution of the pluronic F127/methyl cellulose (MC) gel (r2 > 0.99). The pharmacokinetic parameters of the PNS (6 mg/mL) in pluronic F127/MC gel were evaluated in comparison with the control progesterone suspension. After the administration of PNS in F127/MC gel into the rats, a maximum serum concentration of 22.1 ± 1.9 ng/mL was reached at a Tmax of 4.05 ± 0.1 h. The terminal half life was 12.7 ± 0.8 h. The area under the curve AUC0-∞ of the injected formula was 452.75 ± 42.8 ng h/mL and the total mean residence time was 18.57 ± 1.44 h. The PNS in gel was significantly different from the control in rate and extent at P < 0.001. The natural progesterone which was nanosized and formulated in a thermosensitive gel significantly sustained the action of natural progesterone so that it could be injected every 36 h instead of every day. Moreover, this formula is expected to provide a much safer choice than the use of semi-synthetic progesterone.Keywords: progesterone, nanosuspension, thermosensitive gel, ovariectomized female rats
El pensamiento de Raúl Prebisch: una visión alternativa
Daniel F. Sotelsek Salem
Estudios Demográficos y Urbanos , 2008,
Abstract:
Investigation of the Weldability of Austanitic Stainless Steel  [PDF]
E. M. Anawa, M. F. Bograrah, S. B. Salem
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.58066
Abstract:
This work concerns with the study of weldability of austenitic stainless steel 316 by using automatic tungsten gas shielded arc welding under various welding conditions under which it is designed to weld the samples. Results have been studied using impact and tensile strength tastings of the prepared welding joints using statistical approach. Results obtained showed that as gas flow rate of (CO2) increased the impact energy is increased, while increasing of welding current caused increasing of impact energy up to (120 ampere) then decreased. The tensile strength test results showed that as welding current is increased the tensile fracture load is decreased while increasing gas flow rate caused an increase in tensile fracture load up to 12 L/min then reduced. Microstructure examination of the weld zones did support the explanation of the variation of weld joint mechanical properties.
Protective Effect of Either Dietary or Pharmaceutical n-3 Fatty Acids on Bone Loss in Ovariectomized Rats
Zakaria El-Khayat, Wafaa I. Rasheed, Tahany R. Elias, Jihan Hussein, Fatma Oraby, Manal Badawi, Soheir Salem
Macedonian Journal of Medical Sciences , 2010, DOI: 10.3889/MJMS.1857-5773.2010.0080
Abstract: Background. Evidence suggests that n-3 polyunsaturated fatty acids (PUFA) are beneficial for maintenance of bone health and possibly bone development. Aim. To emphasize the effect of using either dietary flaxseed oil that was given as the sole source of fat in the diet, or orally given pharmaceutical omega-3 together with corn oil in preventing the development of osteoporosis among female surgically ovariectomized rats. Materials and Methods. Seventy two female white albino rats were used in this study, they all fed basal diet. They were divided into six groups: normal control (NC), sham (SH), ovariectomized (OVX), OVX received oral ethinyl estradiol (0.1 mg/kg bw/day), OVX fed with flaxseed oil (50 g/kg diet), OVX supplemented with Pharmaceutical omega-3 (30 μg/kg bw/day). All the groups were tested for bone turnover parameters (alkaline phosphatase, osteocalcin and insulin-like growth factor-1 for bone formation and deoxypyridinoline for bone resorption). Serum calcium and phosphorus were also determined and their excised femur bones were subjected for DEXA analysis and histopathological examination. Results. In OVX rats serum calcium was reduced significantly (p<0.01), while plasma osteocalcin, insulin-like growth factor-1, and urinary deoxypyridinoline were increased significantly (p<0.01) above those of sham and normal control. On either feeding with flaxseed oil or oral supplementation with pharmaceutical omega -3, the level of all these parameters were significantly changed towards normal (p<0.01). Both bone mineral content (BMC) and bone mineral density (BMD) were reduced in the OVX group, significant improvement was obtained after supplementation with flaxseed oil, omega-3 or treatment with estradiol. Conclusion. Supplementation of n-3 fatty acids improved bone health and prevent osteoporosis in the ovariectomized animals.
New Approach of QoS Metric Modeling on Network on Chip  [PDF]
Salem Nasri
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.45040
Abstract: This paper presents a new NoC QoS metrics modeling shaped on mesh architecture. The new QoS model is based on the QoS parameters. The goal of this work is to quantify buffering requirements and packet switching techniques in the NoC nodes by analyzing some QoS metrics such as End-to-End delays (EEDs) and packet loss. This study is based on simulation approach of a 4 × 4 mesh NoC behavior under multimedia communication process. It proposes a study of NoC switching buffer size avoiding packet drop and minimizing EED. Mainly, we focus on percent flit losses due to buffer congestion for a network loading. This leads to identify the optimal buffer size for the switch design. The routing approach is based on the Wormhole Routing method.
The Relativistic Mechanic Theory of the String  [PDF]
Mohamed Salem
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.64040
Abstract: In this article, a novel speculative method is used to derive the relativistic mechanic that governs the motion of the vibrating string within the compactified-dimensions spacetime. This mechanic claims that the relativistic mechanic of the special relativity should be only valid for the motion within the familiar four-dimensional spacetime. However, our novel mechanic is valid for the motion within the compactified-dimensions spacetime predicted by the string theory. The equations of this new mechanic show that the vibrating string can move within the compactified dimensions in a speed that is faster than light. It is also shown that this new relativistic mechanic goes to the classical Newtonian mechanic whenever the speed of the vibrating string is much less than the speed of light. Since the proposed mechanic does not prohibit the existence faster than light motion, it may uncover some of the mysteries regarding the string theory, such as the existence of tachyon and time travel. The main goal of this paper is to show that the motion within the compactified-dimensions spacetime obeys a different relativistic mechanic that will provide a startling and revolutionary perspective on the universe and answer some of the fundamental questions posed in the modern physics.
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