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Some Problems of Irrigation Water Management in Lower Cheliff Plain （Algeria）

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Journal of Environmental Science and Engineering(A) 2012年第3期1卷 271-278页

作者： abdelhamid BradaI Abdelkader Douaoui Tarik Hartani Water and Environment Laboratory Agricultural Sciences Institute Chlef University Chief02000 Algeria Agricultural Production and Durable Safeguarding of the Natural Resource Laboratory Earth Sciences Institute Khemis MilianaUniversity Khemis Miliana 44225 Algeria National School of Agronomic Sciences （ENSA） El Herrach 16200 Algiers Algeria

In the Lower Cheliff Plain （northwestern of Algeria）, the waters resources are limited; the adoption of a rational approach in the management of irrigation water in the irrigated perimeter poses an inequality in the balance between supply and demand. The two surface water resources, Gargar and Merdjet Sidi Abed dams, do not satisfy the requirements of agriculture water. According to the National Office of the Irrigation and Drainage data, the quantity of allocated water is never distributed; the difference between allocated water and drop water can also exceed 20%, and then, another problem of management is that the water losses in the distribution can reach 20% again. The shortage irrigation water resource allocated has constrained the farmers to use groundwater. The chemical analysis of 56 simples to this water showed a significant chemical diversity in the compositions. There is a high salinity risk （C3 class） or very high risk （C4 class） of soil salinisation. A space chart distribution to the EC water probability to exceed 2.25 dS/m interpolated by the indicator kriging method showed that 78% of the groundwater surface presents a significant probability to exceed this limit. The average value of the SAR （sodium adsorption ratio） is lower than 10 that indicates a moderate risk of sodisation. This observation is in contradiction with the high values of the SAR measured in the soil solution. The approach of residual alkalinity （RSC） shows that a good number of drillings analyzed presents a positive sign RSC （RSC 〉 0）. This water presents a real danger of sodisation. They have a low salinity, which, for a farmer, does not present any danger.

关键词： Management water irrigation groundwater water quality.

Exploring Salinity Perception in Lower Cheliff Plain （Algeria）

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Journal of Agricultural Science and Technology(A) 2012年第11期2卷 1253-1259页

作者： Tarik Hartani abdelhamid Brada Abdelkader Douaoui Agricultural Water Management Laboratory National High School of Agronomy (ENSA) Algiers 16200 Algeria Water and Environment Laboratory Agricultural Sciences Institute Chief University Chief02000 Algeria Agricultural Production and Durable Safeguarding of the Natural Resource Laboratory Earth Sciences Institute Khemis Miliana44225 Algeria

Salinity is a well known phenomenon throughout the agricultural fields of Algeria, where irrigation uses poor quality waters. This paper describes the results of a survey of farmers＇ perception of salinity with regard to salinity assessment. In the lower Cheliff plain, 42 farmers were interviewed using semi-structured questionnaires, and simultaneously, water and soil＇s salinity were measured in the laboratory. The results from this sample analysis were compared to the farmers＇ individual opinion on soil and water salinity. Conclusions point to a positive agreement between the two approaches because farmers are familiar with techniques and strategies to mitigate salinity effects. However, they do not perceive the risk of newly changing irrigation water source, which open up to soil degradation hazard.

关键词： Perception soil crops water salinity interview.

Extracting Depth Information Using a Correlation Matching Algorithm

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Journal of Software Engineering and Applications 2012年第5期5卷 304-313页

作者： Mahmoud abdelhamid Jeffery Beers Mohammed Omar Clemson University International Center for Automotive Research CU-ICAR Greenville USA.

This manuscript presents a modified algorithm to extract depth information from stereo-vision acquisitions using a correlation based approaches. The main implementation of the proposed method is in the area of autonomous Pick & Place, using a robotic manipulator. Current vision-guided robotics is still based on a priori training and teaching steps, and still suffers from long response time. This study uses a stereo triangulation setup where two Charged Coupled Devices CCDs are arranged to acquire the scene from two different perspectives. The study discusses the details to calculate the depth using a correlation matching routine which programmed using a Square Sum Difference SSD algorithm to search for the corresponding points from the left and the right images. The SSD is further modified using an adjustable Region Of Interest ROI along with a center of gravity based calculations. Furthermore, the two perspective images are rectified to reduce the required processing time. The reported error in depth using the modified SSD method is found to be around 1.2 mm.

关键词： Stereo-Vision Depth Passive Triangulation Pick and Place

Effect of TiO_2 and ZrO_2 reinforcements on properties of Al_2O_3 coatings fabricated by thermal flame spraying

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Transactions of Nonferrous Metals Society of China 2016年第5期26卷 1345-1352页

作者： Rassim YOUNES Mohand Amokrane BRADAI abdelhamid SADEDDINE Youcef MOUADJI Ali BILEK Abderrahim BENABBAS Laboratory of Mechanics Materials and Energetic Faculty of Technology University of Bejaia Laboratory of Mechanics Faculty of Engineering Sciences Campus Chaabet-ErsasUniversity of Constantine Mechanical Laboratory of Structure and Energetic Mechanical Engineering DepartmentUniversity of Tizi-Ouzou Laboratory Processes for Materials Energy Water and Environment Faculty of Science and TechnologyUniversity of Bouira

The alumina composite coatings reinforced with 25% ZrO2 （denoted as AZ-25） and 3% TiO2 （denoted as AT-3） were deposited on low carbon steel using a thermal flame spraying. The microstructure, phase composition, microhardness and tribological properties of the coatings were investigated. The XRD results of the coatings reinforced by TiO2 （AT-3） revealed the presence of α-Al2O3 phase as matrix and new metastable phases of α-Al2O3 and α-Al2O3. However, the coatings reinforced by ZrO2 （AZ-25） consist of α-Al2O3 as matrix, q-ZrO2 and m-ZrO2. In most studied conditions, the AT-3 coating displays a better tribological performance, i.e., lower coefficient of frictions and wear rates, than the AZ-25 coating. It was also found that the microhardness of the coatings was decreased with the reinforcement of ZrO2 and increased with TiO2.

关键词： thermal spraying coatings reinforcements friction coefficient wear rate

Late chordee correction after tubularized incised plate repair for proximal hypospadias:An underreported problem

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UroPrecision 2024年第2期2卷 51-57页

作者： Amr abdelhamid Abouzeid Mohammad Seada Mohamed Waly Department of Pediatric Surgery Ain Shams University Faculty of MedicineCairoEgypt Department of Pediatric Surgery Benha Specialized Children HospitalBenhaEgypt

Background:Repair of proximal hypospadias remains a challenge with no consensus on the best surgical *** reports have shown recurrence of chordee after plate-preserving *** this report,we present our experience in managing cases who presented with persistent/recurrence of chordee after tubularized incised plate(TIP)repair for proximal ***:Between 2015 and 2023,the study included eight patients who presented with ventral penile curvature after previous hypospadias repair in infancy(TIP urethroplasty).Reoperation to correct persistent ventral curvature was performed several years after the primary TIP repair(3-15 years;mean 7.9 years;median 7.5 years).The reoperation was a two-stage procedure:the first stage comprised transection of the urethra and grafting(lower lip mucosal graft);the second stage(6 months later)was a Thiersch-Duplay ***:Complications included poor taking of the graft after the first stage in one case(12.5%),which was regrafted using buccal(cheek)*** after second stage included urethro-cutaneous fistulae in five(62.5%)that were successfully surgically treated at a later ***-up after second stage ranged between 6 months and 7 years(mean 2.4 years;median 1 year).Satisfaction with reoperation to correct penile curvature was noted by parents as well as older children(adolescents)who appreciated better cosmesis by increasing ventral penile length and improved ***:Preservation of the urethral plate in proximal hypospadias may result in shortened penile length,mostly on the ventral aspect.A two-stage reoperation to increase the length of the penile urethra can successfully reverse this complication.

关键词： complications hypospadias proximal severe ventral curvature

Comprehensive Modulation and Classification of Faults and Analysis Their Effect in DC Side of Photovoltaic System

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Energy and Power Engineering 2013年第4期5卷 230-236页

作者： Mehrdad Davarifar abdelhamid Rabhi Ahmed El Hajjaji University of Picardie “Jules Verne” Laboratory MIS (Modeling Information & Systems) 33Rue Saint Leu Amiens 80039 France

The first step in automatic supervision, condition monitoring and fault detection of photovoltaic system is recognition, exploration and classification of all possible faults that maybe happen in the system. This paper aims to perceive, classified, simulate and discus all electrical faults in DC side of photovoltaic system, regarding electrical voltage and current inspections. For that, simplified hybrid model of photovoltaic panel in MATLAB environment is used. Investigation and classification of each type of faults is down and the effects of the faults are illustrated in this paper. Flash test are applied to improved electrical model. Current-Voltage curves signature are interpreted and investigated in simulation environment.

关键词： Photovoltaic Systems Modeling Electrical Fault Fault Detection

Spot urinary sodium for assessing dietary sodium restriction in cirrhotic ascites

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World Journal of Gastroenterology 2009年第29期15卷 3631-3635页

作者： Mohammed abdelhamid El-Bokl Bahaa Eldeen Senousy Khaled Zakaria El-Karmouty Inas El-Khedr Mohammed Sherif Monier Mohammed Sherif Sadek Shabana Hassan Shalaby Department of Gastroenterology and Hepatology Ain Shams University school of Medicine Abbassia 11566 Cairo Egypt

AIM： To evaluate the accuracy of spot urinary Na/K and Na/creatinine （Cr） ratios as an alternative to 24-h urinary sodium in monitoring dietary compliance in patients with liver cirrhosis and ascites treated with diuretics. METHODS： The study was carried on 40 patients with liver cirrhosis and ascites treated with diuretic therapy. Patients were divided into two groups according to 24-h urinary sodium. We measured spot urine Na/K ratio, Na/ Cr ratio and 24-h urinary sodium. Student＇s t test was used to compare the interval variables and x^2 test to compare the nominal variables between the two groups. Receiver operator characteristic curve was used to identify the best cutoff point for Na/K and Na/Cr ratio. RESULTS： The best cutoff point for Na/K ratio was 2.5 （P 〈 0.001） and area under the curve （AUC） was 0.9, and for Na/Cr ratio, the best cutoff point was 35 （P 〈 0.001） and AUC was 0.885. Na/K ratio showed higher sensitivity and accuracy compared to Na/Cr ratio （87.5% and 87% for Na/K ratio; 81% and 85% for Na/Cr ratio, respectively）. CONCLUSION： Spot urine Na/K ratio has adequate accuracy for assessment of dietary sodium restriction compared with 24-h urinary sodium in patients with liver cirrhosis and ascites.

关键词： Ascites Liver cirrhosis Portal hypertension Urinary sodium

Predictors of renal angioembolization outcome:A retrospective analysis with 148 patients at a tertiary urology institute

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Asian Journal of Urology 2022年第2期9卷 103-108页

作者： Hashim Mohamed Farg Mohamed Mohamed Elawdy Karim Ali Soliman Mohamed Ali Badawy Ali Elsorougy Abdalla.abdelhamid Tarek Mohsen Tarek El-Diasty Department of Radiology Urology and Nephrology CentreMansoura UniversityMansouraEgypt Department of Urology Urology and Nephrology CentreMansoura UniversityMansouraEgypt

Objective:The aim of this study was to evaluate the predictor of unsuccessful outcome of renal angioembolization(RAE).Knowing those predictors may help in avoiding unnecessary RAE procedures and their associated side effects,while helping to prepare for an alternate procedure and improving patient's overall ***:A retrospective analysis between January 2006 and December 2018 was performed,and the indications for RAE were classified into post-traumatic,iatrogenic,renal tumors,and *** who underwent RAE prior to nephrectomy were *** tomography angiography was performed in patients with normal renal function and those who had no contrast allergy,otherwise magnetic resonance angiography was *** the purpose of statistical analysis,we stratified patients into two main categories based on the final outcome—successful or ***:Of 180 patients,32 with negative angiography were eliminated,leaving 148 patients;136(91%)had successful outcomes after one or more trials and 12 had unsuccessful *** mean age was 45±15 years,and 105(71%)were *** gender,side of the lesion,presence of hematuria,indication for RAE,nor the type of lesion affected the *** the other hand,renal anatomy with presence of accessory artery was the only predictor to failed RAE(p=0.001).Failed RAE trial was a predictor for nephrectomy as a secondary procedure(p=0.03).Conclusion:No pre-procedural predictors could anticipate the RAE outcome,and different indications can be scheduled to RAE,which is equally *** presence of accessory renal artery on diagnostic angiography is the only factor that may predict the failure of the procedure.

关键词： Angioembolization Renal angioembolization Embolization Renal trauma Outcome

Thermal Behavior of Clay-Based Building Materials: A Numerical Study Using Microstructural Modeling

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Journal of Power and Energy Engineering 2022年第4期10卷 63-73页

作者： Ahmed Lkouen Mohamed Lamrani Ahmed Meskini abdelhamid Khabbazi LM2I ENSEM Hassan II University Casablanca Morocco LGCEM EST Sale Mohamed V University Rabat Morocco EMDD_CERNE2D EST Sale Mohammed V University Rabat Morocco

A large part of the energy savings in the building sector comes from the choice of materials used and their structures. We are interested, through a numerical study, in establishing the link between the thermal performance of composite materials and their microstructures. The work begins with the generation of a two-phase 3D composite structure, the application of the Random Sequential Addition (RSA) algorithm, and then the finite element method (FE) is used to evaluate, in steady-state, the effective thermal conductivity of these composites. The result of the effective thermal conductivity of composite building material based on clay and olive waste at a volume fraction of 10% obtained by simulation is 0.573 W·m?1·K?1, this result differs by 3.6% from the value measured experimentally using modern metrology methods. The calculated value is also compared to those of existing analytical models in the literature. It can be noticed also that the effective thermal conductivity is not only related to the volume fraction of the inclusions but also to other parameters such as the shape of the inclusions and their distribution. The small difference between the numerical and experimental thermal conductivity results shows the performance of the code used and its validation for random heterogeneous materials. The homogenization technique remains a reliable way of evaluating the effective thermal properties of clay-based building materials and exploring new composite material designs.

关键词： Effective Thermal Conductivity Finite Element Calculation Homogenization RSA Composite