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Search Results: 1 - 10 of 401454 matches for " Jabar M. Khalaf "
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Dielectric Properties and a.c. Conductivity of Epoxy/Alumina Silicate NGK Composites  [PDF]
Waleed A. Hussain, Abdullah A. Hussein, Jabar M. Khalaf, Ali H. Al-Mowali, Abdullwahab A. Sultan
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53028
Abstract: Alumina silicate powder which is extracted from the obsolete spark plug NGK (insulator part as a filler) has been used to produce epoxy/alumina silicate composite. The dielectric behavior of the composite materials (epoxy resin-alumina silicate NGK) is analyzed as a function of the filler content, temperature and frequency. AC conductivity and impedance are also studied. The results show that the permittivity, dielectric loss and loss tangent for all composites increase with increasing alumina silicate NGK filler content.
Use of Basal Serum Testosterone Level as Predictor for Poor Ovarian Response in Women with Unexplained Infertility Undergoing In Vitro Fertilization Cycle: Prospective Study  [PDF]
Waleed M. Khalaf, Hayam Fathy, Sarah Safwat
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.814153
Abstract: Background: Delayed pregnancy in women and marked increase in the numbers of older women who fail to respond to ovarian stimulation had been a significant issue. This study aims to assess the value of basal serum testosterone level as a predictor of ovarian response for induction of ovulation in women with unexplained infertility undergoing IVF (in vitro fertilization) cycle. Patients and Methods: A prospective study was conducted in Ain Shams University Maternity hospital Infertility Center during a period of time from October 2016 to June 2017. This study recruited 89 women. On day 2 or 3 of a spontaneous menstrual cycle of the included women within 3 months before fresh IVF cycle, basal hormonal (FSH, LH, estradiol, total testosterone) concentrations, AFC (antral follicle count) were performed. Using the Long-protocol for induction of ovulation, serial monitoring of ovarian response was assessed by transvaginal ultrasound. When the expected ovarian response was reached (at least three oocytes 17 mm), we gave trigger dose of HCG. Ultrasound guided oocyte aspiration was performed 34 -
Morphological and Physiological Characterization of Alternaria solani Isolated from Tomato in Jordan Valley
Khalaf M. Alhussaen
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2012.316.319
Abstract: Alternaria solani is known economically important and the casual agent of early blight on potato and tomato. Identification of plant pathogens is very important in helping to find effective disease control or management methods. Morphology and physiology characteristics of Alternaria solani were investigated for identification and variability. The optimum pH levels of Alternaria solani grow in vitro were 6-7 and the optimum growing temperatures of the isolates recovery in this study was 25 and 30°C. The mycelial width between 0.8-1.5 μm and the conidia are 35-75 μm in length and 10-20 μm in width and 2-7 transverse septa and 1-4 longitudinal septa. This study pointed that there was a variation in the population of Alternaria solani isolated from Jordan valley based on morphology and physiology characteristics.
Problems in Software Quality Assurance and Reasons
Mohammed Khalaf M Alshammri
International Journal of Computer Science Issues , 2013,
Abstract: This paper is aimed at highlighting the problems which has been faced by the project managers as well as the companies regarding the quality assurance. It has been seen that people do not pay much attention towards the quality assurance issues and thus eventually end up with wasting their money as well as time. Thats why it is important to make sure that the project meets the quality requirements.
Effect of Soil Acidity on Diseases Caused by Pythium ultimum and Fusarium oxysporum on Tomato Plants
Khalaf M. Alhussaen
Journal of Biological Sciences , 2012,
Abstract: Pythium ultimum and Fusarium oxysporum are important pathogens in agriculture crops and cause serious diseases that resulted in reducing the yield of many crops. The effect of soil acidity on the occurrence and severity of diseases caused by Pythium ultimum and Fusarium oxysporum were examined. Pathogens were grew at pH levels of 2-10 in vitro. Pythium ultimum and Fusarium oxysporum isolates have an optimum growth pH level of 6 and 7 and grew well at pH level of 5 and slightly at pH level of 4 and 8 but no growth at pH levels of 2, 3, 9 and 10. Six treatments (4, 5, 6, 7, 8 and 9) were tested in vivo to examine the effect of soil pH on the occurrence and severity of disease. The pH level of 5 was the best for plant growth but not to both pathogens. However, more disease severity by the two pathogens were found at the pH levels of 6 and 7. The pH levels could be used to reduce the plant disease reduction by knowing the optimum levels for plants and pathogens.
Design and Implement an Automatic Neural Tagger Based Arabic Language for NLP Applications
H. Yousif Jabar,M. Tengku,Tengku Sembok
Asian Journal of Information Technology , 2012,
Abstract: To this day, various methods such as the statistical model, rule-based models and Support Vector Machine have been used to implement the POS tagger systems. However, these approaches require a large amount of data in order to adapt and implement the POS tagger. The neural approaches, on the other hand, only use lesser amount of data to perform the training and learning stages. The Arabic part of speech (POS) based multilayer perceptron is designed and implemented, while the Error back-propagation learning algorithm is used. The experiments have proven that not only the multilayer perceptron tagger is highly accurate (of 99.99%), it requires low processing time and a lesser amount of data to achieve the learning phase. A new coding scheme is investigated and implemented.
Mean Square Solutions of Second-Order Random Differential Equations by Using the Differential Transformation Method  [PDF]
Ayad R. Khudair, S. A. M. Haddad, Sanaa L. Khalaf
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.64028
Abstract: The differential transformation method (DTM) is applied to solve the second-order random differential equations. Several examples are represented to demonstrate the effectiveness of the proposed method. The results show that DTM is an efficient and accurate technique for finding exact and approximate solutions.
Subrectal and Subcutaneous Wound Infiltration with Bupivacaine versus Pethidine for Post Cesarean Section Pain Relief: Randomized Controlled Trial  [PDF]
Waleed M. Khalaf, Mohamed Elmandouh Mohamed Ibrahim, Sarah Safwat
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.811108
Abstract: Background: Cesarean section (CS), one of the most common major operative procedures, performed all over the world. Incisional infiltration with local anesthetics is a simple, cheap and effective mean of providing good analgesia for surgical operations without any major side effects & allowing early patients’ mobilization & postoperative recovery, so the purpose of study is to compare between the effect of wound infiltration with bupivacaine versus pethidine for post cesarean section pain relief. Patients and Methods: A randomized controlled trial (RCT) was conducted in Ain Shams University Maternity hospital in the period from August 2016 and January 2017. 100 full term pregnant females randomized into two groups: Group A (50 patients) Bupivacaine group: Subcutaneous and subrectal infiltration with 10 ml 0.25% Bupivacaine (2.5 mg/ml) diluted in 10 ml normal saline before closure of the wound was done; Group B (50 patients) Pethidine group: Subcutaneous and subrectal infiltration with 1 ml pethidine (50 mg/ml) diluted in 19 ml normal saline before closure of the wound was done. All patients had cesarean section under spinal anesthesia. Study outcome measures post-operative pain scores using visual analogue scale, post-operative analgesia requirement time to first rescue analgesia, onset of mobilization, side effect of local anesthetic, wound infection (after one week). It was registered on clinical trials.gov with ID: NCT03652116. Results: Visual analogue scale values differ significantly between pethidine group and that of bupivacaine at rest and on coughing at 4, 8, 12, 24 hours & analgesic consumption (P value < 0.05). There is high statistical significant difference in 1st time request analgesia per minute comparing group A to group B (P value 0.001). There is no significant difference between bupivacaine and pethidine regarding time of ambulation, side effects or complications. Conclusion: Infiltration of the wound of cesarean section with pethidine gives effective analgesia for several hours as compared to Bupivacaine.
Effect of Metformin on Endometrial Thickness and Subendometrial Flow Patterns in Anovulatory Patients with Polycystic Ovarian Syndrome  [PDF]
Waleed M. Khalaf, Sherif A. Akl, Rania R. Ramadan
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.814148
Abstract: Background: Polycystic ovarian syndrome (PCOS) is considered the commonest endocrinological disorder affecting reproductive aged women. PCOS compromises fertility through various pathways. These pathways include hyperandrogenism, insulin resistance and impedance of the uterine and endometrial blood flow. Metformin improves the blood flow to the endometrium. It acts by reducing androgen level and correction of insulin resistance. Endometrial vascular indices were evaluated in this study to evaluate endometrial receptivity in anovulatory patients with PCOS. Aim of the Work: To evaluate the outcome of metformin administration in anovulatory patients with PCOS and its effect on the endometrium. This included its role in ovulation and improvement of pregnancy rates. Patients and Methods: This study included 85 patients from Ain Shams University outpatient infertility clinics from 1st of January, 2018 till 30th of June, 2018. We investigated these patients before treatment with ultrasound on day 14, 21. We evaluated endometrial thickness, uterine artery flow pattern, endometrial and subendometrial flow patterns. The patients received metformin 500 mg three times per day for three months. After this duration, we reevaluated them by ultrasound at days 14, 21. Results: Metformin therapy resulted in a significant increase of endometrial thickness and had a significant decrease on uterine, endometrial and subendometrial resistance index (R.I) and pulsatility index (P.I) at day 14, 21 compared to pre-treatment values indicating better blood flow. Conclusion: Metformin therapy resulted in improvement of endometrial flow patterns. Also, it resulted in increase in endometrial thickness and improvement of uterine artery flow.
Effect of Different Saliva Decontamination Procedures on Bond Strength to Dentin in Single Bottle Systems
M. Ghavam,Sh. Khalaf Pour
Journal of Dentistry of Tehran University of Medical Sciences , 2004,
Abstract: Statement of Problem: Following the increasing use of composites in restoring anterior and posterior teeth, problems due to its technique sensitivity have become a major concern.One of these problems is the possibility of contamination of dentin with saliva, blood and/or gingival fluid in different stages of bonding procedure, even with application of different methods of isolation. However, by introduction of Single-bottle dentin adhesives,the contamination possibility reduced to two stages. Scientific documents show that saliva contamination reduces bond strength of composites to dentin. Application of simple and efficient methods for reducing or eliminating saliva contamination enables clinicians to carry out dental treatment without any concern about deterioration of clinical longevity of restoration.Purpose: This study was designed to compare the effect of different decontamination methods on the shear bond strength of composite to dentin using a “Single-bottle” adhesive.Materials and Methods: Seventy-two extracted sound human molars and premolars were selected. Enamel of buccal surface was ground flat to expose dentin. The teeth were divided into 9 groups of 8 each. In control group (1) the adhesive “Excite” was used according tothe manufacturer, without any contamination. Conditioned and saliva contaminated dentin was (2) rinsed and blot dried, (3) rinsed, dried and re-etched. In groups 4, 5, 6 uncured adhesive was saliva contaminated and then: (4) only blot dried (5) rinsed, blot dried with adhesive reapplication and (6) resurfaced with bur, rinsed, dried and followed by repeating the whole process. In groups 7, 8, 9 cured adhesive was contaminated with saliva and then:(7) rinsed and dried (8) rinsed, blot dried with adhesive reapplication (9) same as group (6).Then “Tetric Ceram” composite cylinders were bonded to dentin surfaces. Samples were thermo cycled in 5°C and 55°C water, 30 seconds in each bath with a dowel time of 10 seconds for 500 cycles. Finally, samples were sheared using Instron testing machine andshear bond strength data were subjected to one way ANOVA analysis, and Tukey HSD PostHoc. Mode of failure of samples was examined under Stereomicroscope (×40) and using Log-rank survival data analysis.Results: No statistically difference between mean shear bond strength of groups 1,2,3 was observed (P=0.543). Comparison of groups 4,5,6 with group 1 showed that shear bond strength of group 4 was significantly lower (P<0.001). Mean shear bond strength of groups1,7,8,9 were not significantly different (P=0.150). The major mode of failure w
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