Abo-Khalil A.G.,Assiut University |
Abo-Khalil A.G.,Almajmaah University |
Abo-Zied H.,Assiut University
IECON Proceedings (Industrial Electronics Conference) | Year: 2012
In this paper, a sensorless based doubly-fed induction generator (DFIG) control in wind power generation systems is proposed, which is based on the theory of support vector regression (SVR). The inputs of the SVR wind speed estimator are chosen as the wind turbine power and rotational speed. During the offline training, a specified model which relates the inputs to the output is obtained. Then, the wind speed is determined online from the instantaneous inputs. Meanwhile, the DFIG rotor dq-axis currents are controlled to optimize the stator active and reactive power. The stator active power is adjusted in order to extract the maximum power from the wind power. The output reactive power of the wind power conversion system is controlled as zero to keep unity power factor of the stator voltage and current. However, the stator reactive power control is used to optimize the generator efficiency by sharing the reactive power between stator and rotor. The experimental results show the excellent of performance of the power, current and pitch angle controllers in the steady state and transient responses for the different modes and wind speed. The experimental results have verified the validity of the proposed estimation and control algorithms. © 2012 IEEE.
Saad K.,Assiut University |
El-Houfey A.A.,Assiut University |
Abd El-Hamed M.A.,Assiut University |
El-Asheer O.M.,Assiut University |
And 2 more authors.
Functional Neurology | Year: 2015
This study was conducted to assess the efficacy of oral zinc supplementation in children with intractable epilepsy. Forty-five children aged between three and 12 years and diagnosed with idiopathic intractable epilepsy at Assiut University Hospital, Assiut, Egypt were recruited. The patients were randomly allocated to two groups: the intervention group received oral zinc supplementation (1 mg/kg/day) while the placebo group received placebo, each for six months. The parents of each child filled in a detailed questionnaire that covered demographic characteristics, type of seizures, frequency, duration of seizures, previous hospital admissions, postictal phenomena and the occurrence of status epilepticus. The primary outcome (frequency of seizures) was compared between the two groups. Zinc supplementation resulted in a significant reduction of seizure frequency in 31% of the treated children. Zinc is an important trace element. Our results suggest that it has mildly beneficial effects in children with intractable epilepsy. We recommend further investigation of oral zinc supplementation as an adjunctive therapy for managing intractable epilepsy in children. Zinc therapy may be an option in treatment protocols for intractable epilepsy in the near future. © 2015, CIC Edizioni Internazionali s.r.l. All rights reserved.
PubMed | Almajmaah University, Council for Nutritional and Environmental Medicine, Assiut University, Nicholson Science and Jazan University
Type: Journal Article | Journal: Clinical psychopharmacology and neuroscience : the official scientific journal of the Korean College of Neuropsychopharmacology | Year: 2015
There is growing evidence for a gut-brain connection associated with autism spectrum disorders (ASDs). This suggests a potential benefit from introduced digestive enzymes for children with ASD.We performed a double-blind, randomized clinical trial on 101 children with ASD (82 boys and 19 girls) aged from 3 to 9 years. ASD patients were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders 4th edition, text revision (DSM-IV-TR) diagnostic criteria. Structured interviews of at least one hour each both with the parents and the child were performed. Later on, another two hours-session was conducted applying the Childhood Autism Rating Scale (CARS). ASD patients were randomized to receive digestive enzymes or placebo.The ASD group receiving digestive enzyme therapy for 3 months had significant improvement in emotional response, general impression autistic score, general behavior and gastrointestinal symptoms. Our study demonstrated the usefulness of digestive enzyme in our population of ASD patients.Digestive enzymes are inexpensive, readily available, have an excellent safety profile, and have mildly beneficial effects in ASD patients. Depending on the parameter measured in our study, we propose digestive enzymes for managing symptoms of ASD. Digestive enzyme therapy may be a possible option in treatment protocols for ASD in the future.
PubMed | South Valley University, Almajmaah University, University of Exeter, Council for Nutritional and Environmental Medicine and 3 more.
Type: | Journal: Journal of child psychology and psychiatry, and allied disciplines | Year: 2016
Autism spectrum disorder (ASD) is a frequent developmental disorder characterized by pervasive deficits in social interaction, impairment in verbal and nonverbal communication, and stereotyped patterns of interests and activities. It has been previously reported that there is vitamin D deficiency in autistic children; however, there is a lack of randomized controlled trials of vitamin D supplementation in ASD children.This study is a double-blinded, randomized clinical trial (RCT) that was conducted on 109 children with ASD (85 boys and 24 girls; aged 3-10years). The aim of this study was to assess the effects of vitamin D supplementation on the core symptoms of autism in children. ASD patients were randomized to receive vitamin D3 or placebo for 4months. The serum levels of 25-hydroxycholecalciferol (25 (OH)D) were measured at the beginning and at the end of the study. The autism severity and social maturity of the children were assessed by the Childhood Autism Rating Scale (CARS), Aberrant Behavior Checklist (ABC), Social Responsiveness Scale (SRS), and the Autism Treatment Evaluation Checklist (ATEC).UMIN-CTR Study Design: trial number: UMIN000020281.Supplementation of vitamin D was well tolerated by the ASD children. The daily doses used in the therapy group was 300IU vitamin D3/kg/day, not to exceed 5,000IU/day. The autism symptoms of the children improved significantly, following 4-month vitamin D3 supplementation, but not in the placebo group. This study demonstrates the efficacy and tolerability of high doses of vitamin D3 in children with ASD.This study is the first double-blinded RCT proving the efficacy of vitamin D3 in ASD patients. Depending on the parameters measured in the study, oral vitamin D supplementation may safely improve signs and symptoms of ASD and could be recommended for children with ASD. At this stage, this study is a single RCT with a small number of patients, and a great deal of additional wide-scale studies are needed to critically validate the efficacy of vitamin D in ASD.
PubMed | South Valley University, Almajmaah University, e Council for Nutritional and Environmental Medicine, f Dorset County Hospital and 3 more.
Type: Journal Article | Journal: Nutritional neuroscience | Year: 2016
Autism spectrum disorder (ASD) is a developmental disorder characterized by pervasive deficits in social interaction, impairment in verbal and non-verbal communication, and stereotyped patterns of interests and activities. Vitamin-D deficiency was previously reported in autistic children. However, the data on the relationship between vitamin D deficiency and the severity of autism are limited.We performed a case-controlled cross-sectional analysis conducted on 122 ASD children, to assess their vitamin D status compared to controls and the relationship between vitamin D deficiency and the severity of autism. We also conducted an open trial of vitamin D supplementation in ASD children.Fifty-seven percent of the patients in the present study had vitamin D deficiency, and 30% had vitamin D insufficiency. The mean 25-OHD levels in patients with severe autism were significantly lower than those in patients with mild/moderate autism. Serum 25-OHD levels had significant negative correlations with Childhood Autism Rating Scale (CARS) scores. Of the ASD group, 106 patients with low-serum 25-OHD levels (<30ng/ml) participated in the open label trial. They received vitamin D3 (300IU/kg/day not to exceed 5000 IU/day) for 3 months. Eighty-three subjects completed 3 months of daily vitamin D treatment. Collectively, 80.72% (67/83) of subjects who received vitamin D3 treatment had significantly improved outcome, which was mainly in the sections of the CARS and aberrant behavior checklist subscales that measure behavior, stereotypy, eye contact, and attention span.Vitamin D is inexpensive, readily available and safe. It may have beneficial effects in ASD subjects, especially when the final serum level is more than 40ng/ml.UMIN-CTR Study Design: trial Number: R000016846.
Almansour M.A.,Almajmaah University |
Alateeq M.A.,King Fahad National Guard Hospital |
Alzahrani M.K.,Almajmaah University |
Algeffari M.A.,Alqasim University |
Alhomaidan H.T.,Alqasim University
Neurosciences | Year: 2013
Objectives: To evaluate the presence of depression and anxiety in parents/caregivers of autistic spectral disorder (ASD) children, and to identify associated factors. Methods: In this retrospective cohort study carried out between July and December 2011, parents/ caregivers of at least one child diagnosed with an ASD (cases group), were recruited through the Saudi Charitable Society of Autism Families and the Autism Clinic in the Pediatric out-patient clinic in King Fahad National Guard Hospital, King Abdulaziz Medical City (KAMC), Riyadh, Kingdom of Saudi Arabia. The parents/caregivers of a normally developed child (control group) were recruited from the Well Child Clinic at King Abdulaziz Medical City, Riyadh. We used a self-reported questionnaire containing questions on demographic data, as well as the Arabic version of the hospital anxiety and depression scale. Results: The study included 100 parents/caregivers, 50 cases and 50 controls. More than 50% of the control group was in the age group 26-30 years (56%), while 42% of cases were in the age group 31- 35 years. Time lapsed since autism diagnosis was over 3 years in one-third of cases. Twenty-two percent of cases, and only 2% of control parents/caregivers had a history of psychiatric problems (p=0.002). Both the mean depression score, and the mean anxiety score was significantly higher among cases when compared with controls, p<0.001. Conclusion: Autism is associated with burden and stress for parents/caregivers of the affected child. The demands placed by the disability contribute to a higher overall incidence of depression and anxiety among parents/caregivers.
Ghodhbane S.,University of Monastir |
Dhahri A.,University of Monastir |
Dhahri N.,University of Monastir |
Hlil K.E.,CNRS Neel Institute |
And 3 more authors.
Journal of Alloys and Compounds | Year: 2013
The critical properties of La0.8Ba0.2Mn 1-xFexO3 polycrystalline samples near ferromagnetic-paramagnetic phase transition temperature have been investigated by analyzing isothermal magnetization data. Experimental results revealed that all samples exhibit a second-order magnetic phase transition. Dc-magnetization data near the transition temperature have been analyzed with the help of the modified Arrott plot, Kouvel-Fisher method. The value of critical exponents, derived from the magnetization data using the Kouvel-Fisher method, yield 0.370 ± 0.02 6 b 6 0.379 ± 0.01, 1.359 ± 0.02 6 c 6 1.392 ± 0.03 and 4.40 ± 0.0 6 d 6 4.67 ± 0.01with a TC of 125 ± 0.02-157.50 ± 0.02 K. The exponent values are close to those expected for three-dimensional (3D) Heisenberg ferromagnets which is short-range magnetic interaction. © 2013 Elsevier B.V. All rights reserved.
Yasin S.A.,Benha University |
Yasin S.A.,Almajmaah University |
El-Dougdoug W.I.A.,Benha University |
El-Dougdoug W.I.A.,University of Umm Al - Qura
Journal of Dispersion Science and Technology | Year: 2010
The onset of micelles formations critical micelle concentration, diffusion coefficients as well as particle sizes for some new synthesized anionic copolymer surfactants PSA 4a, PSA 4b, and PSA 4c, were determined and discussed. Three different electrochemical techniques such as cyclic voltammetry (CV), rotating disk voltammetry (RDV), and chronocoulometry (CC) were used in this investigation. The voltammetry of electroactive hydrophobic probe ferrocene solubilized surfactants was investigated in aqueous buffer carbonate solutions of pH 10. The CMC for each PSA 4a, PSA 4b, and PSA 4c, was found to be 3.20×10 -4,4.60×10 -4 and 6.30×10 -4M, respectively, using both CV and RDV techniques. The amount of adsorption contribution of ferrocene solubilized surfactants at the glassy carbon electrode was determined from chronocoulometric measurements and it was found in the range from (1.4 to 2.7)×10 -15M. The apparent diffusion coefficients were estimated from RDV measurements and the real micelles diffusion coefficients were obtained. Re-quilibrium considerations of ferrocene probe kinetics at the electrode surface were treated according to two different modes of slow- and fast-kinetics. The corrected diffusion coefficient values showed constancy at (5.3±0.1)×10 -7, (4.8±0.1)×10 -7, and (3.6±0.4)×10 -7 cm 2/sec for PSA 4a, PSA 4b, and PSA 4c, respectively in the concentration range from 20 to 200 mM. The morphological features of anionic copolymeric surfactants PSA 4a, PSA 4b, and PSA 4c, micelles showed globular self-assembled structure. © Taylor & Francis Group, LLC.
Atram A.R.,Almajmaah University
African Journal of Psychiatry (South Africa) | Year: 2015
Background and Objectives: The high prevalence of psychiatric conditions in the general hospital settings and its demand on the system is well known. The aim of this study was to examine the overall diagnostic trends in psychiatric consultations in the city of Zulfi in Riyadh province and to test the ability of non-psychiatric physicians in proper detection of psychiatric morbidity. Subjects and methods: 113 patients were studied in detail over a period of two years. Results: three psychiatric diagnoses were the most prevalent: (1) neurotic, stress related and somatoform disorders (27.6%) (2) Organic, including symptomatic mental disorder (29.2%), and Mood [affective] disorders (15%). There was significantly high agreement between psychiatrists and non- psychiatric physicians in detecting single psychiatric symptomatology (P<0.001),With higher ability to detect negative symptoms (99.1%) conversion (96.5%-) ; and suicide/para suicide (95.6%), but non-psychiatric physicians showed lower ability to detect cognitive, emotional or psychotic symptoms and a significantly lower tendency in detecting the whole range of psychiatric symptoms. Conclusion: Non-psychiatric physicians, sometimes, over-estimate or underestimate the importance of symptom. Because of the high prevalence of organic / cognitive disorders, neurotic and mood disorders in the general medical sitting, Consultation-Liaison teaching should devote most of its energy towards the identification and management of these disorders. © 2015, Atram.
Alharbi T.,Almajmaah University
Radiation Physics and Chemistry | Year: 2015
The development of compact, battery-powered digital liquid scintillation neutron detection systems for field applications requires digital pulse processing (DPP) algorithms with minimum computational overhead. To meet this demand, two DPP algorithms for the discrimination of neutron and γ-rays with liquid scintillation detectors were developed and examined by using a NE213 liquid scintillation detector in a mixed radiation field. The first algorithm is based on the relation between the amplitude of a current pulse at the output of a photomultiplier tube and the amount of charge contained in the pulse. A figure-of-merit (FOM) value of 0.98 with 450. keVee (electron equivalent energy) energy threshold was achieved with this method when pulses were sampled at 250. MSample/s and with 8-bit resolution. Compared to the similar method of charge-comparison this method requires only a single integration window, thereby reducing the amount of computations by approximately 40%. The second approach is a digital version of the trailing-edge constant-fraction discrimination method. A FOM value of 0.84 with an energy threshold of 450. keVee was achieved with this method. In comparison with the similar method of rise-time discrimination this method requires a single time pick-off, thereby reducing the amount of computations by approximately 50%. The algorithms described in this work are useful for developing portable detection systems for applications such as homeland security, radiation dosimetry and environmental monitoring. © 2014 Elsevier Ltd.