检索结果-南通市图书馆

Performance Evaluation of an Evaporative Cooling Pad for Humidification-Dehumidification Desalination

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第10期20卷 2323-2335页

作者： Ibtissam El Aouni hicham Labrim Elhoussaine Ouabida Ahmed Ait Errouhi Rachid El Bouayadi Driss Zejli Aouatif Saad Advanced Systems Engineering Laboratory National School of Applied SciencesIbn Tofail UniversityKenitra14000Morocco

The perfect combination of renewable energy and desalination technologies is the key to meeting water demands in a cost-effective,efficient and environmentally friendly *** desalination technique by humidificationdehumidification is non-conventional approach suitable for areas with low infrastructure(such as rural and decentralized regions)since it does not require permanent *** this study,this technology is implemented by using solar energy as a source of thermal power.A seawater desalination unit is considered,which consists of a chamber with two evaporators(humidifiers),a wetted porous material made of a corrugated cellulose cardboard and a condenser(dehumidifier).The evaporation system is tested with dry bulb temperature and relative air humidity *** results of numerical simulations indicate that higher inlet air velocities(from 0.75 to 3 m/s)lead to a decrease in theΔT,ΔRH,and *** the air remaining within the evaporator for 30 cm,the temperature differential increases to 5.7°C,accompanied by a 39%rise in relative humidity *** changes result in a significant enhancement in humidification efficiency,achieving a remarkable efficiency level of 78%.However,a wettability value of 630 m^(2)/m^(3)leads to a smaller reduction of these *** the pad thickness,particularly to 0.3 m,improves performance by boostingΔT,ΔRH,and effectiveness,especially for pads with a wettability of 630 m^(2)/m^(3),for which superior performances are predicted by the numerical tests.

关键词： Desalination humidification dehumidification porous material solar energy evaporator

Oral Hygiene in the Presence of Orthodontic Therapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第2期12卷 98-110页

作者： Emmanuel John Aryeetey hicham Benyahia Fatima Zaoui Faculty of Dental Medicine Mohammed University in Rabat Rabat Morocco

Orthodontic treatment offers great advantages in improving facial and smile aesthetics, self-confidence and the function of the stomatognathic apparatus. The pursuit of these advantages makes use of orthodontic appliances that could be fixed or removable. However, it’s worth stating that these appliances interfere with tooth brushing, making it more difficult to brush teeth effectively. Orthodontics appliances therefore promote the accumulation of dental plaque, which results in both quantitative and qualitative changes in the oral microbiota, hence, exposing patients to several adverse effects such as White spot lesions, dental caries, periodontal pathologies and halitosis. For this reason, oral assessment of patients before, during and after treatment is necessary as well as oral hygiene instructions and motivation. Orthodontists therefore, should educate patients on oral and periodontal hygiene in order to control dental and periodontal complications. Prescriptions of plaque control materials adapted to each patient are done in order to optimize the final result and minimize unwanted complications.

关键词： Orthodontic Treatment Oral Microbiome Oral Hygiene Periodontitis Gingivitis Orthodontic Fixed Appliances Orthodontic Removable Appliances White Spot Lesions (WSL)

Velamentous Cord Insertion: Interest of Antenatal Diagnosis and Review of the Literature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2024年第2期14卷 234-239页

作者： Karam Harou Aboubacar Sidiki Sidibe hicham Abdelkhalki Abderaouf Soummani Department of Obstetrics and Gynecology Caddi Ayyad University Medical Hospital Med VI Marrakech Morocco

Velamentous insertion of the umbilical cord corresponds to the insertion of the cord directly on amniotic membranes. It is a rare situation whose frequency varies from 0.5% to 1.69% of single pregnancies. It must be diagnosed during the morphological ultrasound of the 2nd trimester, actively looking for the association with a vasa previa, due to the risk of fetal haemorrhagic threat. We report an antenatal diagnosis of velamentous cord insertion and its management with literature review.

关键词： Velamentous Cord Insertion Vasa Previa Antenatal Diagnosis Ultrasound Doppler Benckiser’s Hemorrhage

Extra Renal Rhabdoid Tumor: A Rare Cause of Congenital Soft Tissue Tumor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Pediatrics 2024年第3期14卷 579-584页

作者： Tazi Charki Mohammed Akammar Amal Dardar Hajar Abdellaoui hicham Atarraf Karima Boubou Meryem Afifi Moulay Abderrahmane Department of Pediatric Orthopedic and Traumatology University Hospital Hassan II Fez Morocco The Faculty of Medicine and Pharmacy Sidi Mohamed Ben Abdellah University Fez Morocco Department of Radiology University Hospital Hassan II Fez Morocco

Rhabdoid tumors (RTs) are a well-defined entity in the kidney or central nervous system of infants or children. However, soft-tissue involvement is uncommon. It’s an exceptional neonatal tumor of soft tissue. The imaging characteristics of this tumor are not specific. Biopsy allows diagnosis;the histomorphological characteristics of rhabdoid tumors, their immunoreactivity to epithelial markers and vimentin, and the INI-1 loss are important tools for diagnosis. RT tumors are aggressive and have a rapidly fatal clinical course in most cases. Despite multidisciplinary therapy, the survival rate is very low. We report a rare case occurring in a male neonate who presents at birth with a voluminous right axillary mass. A CT scan showed a well-limited tumor mass with lobulated contours. An ultrasound-guided biopsy was performed on day 8, showing the morphology and immunoprofile of RT. The mass showed rapid growth. The child was admitted for respiratory distress at 3 weeks. A thoraco-abdominal CT showed an increase in the size of the mass with the appearance of multiple lymph nodes and pleural, hepatic, and renal metastases. The child died two days later.

关键词： Congenital Rhabdoid Tumor Soft Tissue Diagnosis Immunohistochemistry INI-1

An Efficient Hybrid Model for Arabic Text Recognition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第2期74卷 2871-2888页

作者： hicham Lamtougui hicham El Moubtahij Hassan Fouadi Khalid Satori LIIAN Laboratory Faculty of Sciences Dhar-MahrazFez30000Morocco Modeling Systems and Technologies of Information TeamUniversity of Ibn ZohrAgadir

In recent years,Deep Learning models have become indispensable in several fields such as computer vision,automatic object recognition,and automatic natural language *** implementation of a robust and efficient handwritten text recognition system remains a challenge for the research community in this field,especially for the Arabic language,which,compared to other languages,has a dearth of published *** this work,we presented an efficient and new system for offline Arabic handwritten text *** new approach is based on the combination of a Convolutional Neural Network(CNN)and a Bidirectional Long-Term Memory(BLSTM)followed by a Connectionist Temporal Classification layer(CTC).Moreover,during the training phase of the model,we introduce an algorithm of data augmentation to increase the quality of *** proposed approach can recognize Arabic handwritten texts without the need to segment the characters,thus overcoming several problems related to this *** train and test(evaluate)our approach,we used two Arabic handwritten text recognition databases,which are IFN/ENIT and *** Experimental results show that our new approach,compared to other methods in the literature,gives better results.

关键词： Deep learning arabic handwritten text recognition convolutional neural network(CNN) bidirectional long-term memory(BLSTM) connectionist temporal classification(CTC)

EXISTENCE OF POSITIVE SOLUTIONS FOR A CLASS OF PARABOLIC EQUATIONS WITH NATURAL GROWTH TERMS AND L^1 DATA

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2014年第4期34卷 1127-1144页

作者： Kaouther AMMAR hicham REDWANE Department of Mathematics Faculty of sciencesTaibah UniversityP.O. Box 344 Al MadinahSaudi Arabia Facult'e des Sciences Juridiques Economiques et SocialesUniversit'e Hassan 1B.P. 784SettatMorocco

We study a class of nonlinear parabolic equations of the type：δb（u）/δt-div（a（x,t,u）△u）＋y（u）｜△u｜^2=f,where the right hand side belongs to L^1（Q）, b is a strictly increasing C^1-function and -div（a（x, t, u）△u） is a Leray-Lions operator. The function g is just assumed to be continuous on R and to satisfy a sign condition. Without any additional growth assumption on u, we prove the existence of a renormalized solution.

关键词： renormalized solutions natural growth terms L^1 data

Adaptive control of permanent magnet synchronous machines with disturbance estimation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2012年第3期10卷 337-343页

作者： hicham CHAOUI Pierre SICARD Industrial Electronics Research Group School of EngineeringUniversite du Quebec a Trois-RivieresTrois-RivieresQuebecCanada

In this paper, an adaptive control scheme is introduced for permanent magnet synchronous machines （PMSMs） as an alternative to classical control techniques. The adaptive control strategy capitalizes on the machine＇s inverse dynamics to achieve accurate tracking by using an observer to approximate disturbance in the form of friction and load torque. The controller＇s output is then fed to a space vector pulse width modulation （SVPWM） algorithm to produce duty cycles for the inverter. The control scheme is validated through a set of simulations on an experimentally validated PMSM model. Results for different situations highlight its high speed tracking accuracy and high performance in compensating for friction and load disturbances of various magnitudes.

关键词： Adaptive control Speed control Observer Disturbance estimation Synchronous machine

Fuzzy adaptive sliding mode controller for electrically driven wheeled mobile robot for trajectory tracking task

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2022年第1期9卷 71-79页

作者： Brahim Moudoud hicham Aissaoui Mohammed Diany Laboratory of Sustainable Development Faculty of Sciences and TechnologiesSultan Moulay Slimane UniversityBeni MellalMorocco Industrial Engineering Laboratory Faculty of Sciences and TechnologiesSultan Moulay Slimane UniversityBeni MellalMorocco

This paper presents a fuzzy adaptive sliding mode controller(FASMC)for electrically driven wheeled mobile robot for trajectory tracking task in the presence of uncertainties and ***,a finite-time kinematic controller is developed to compute the auxiliary velocity ***,the FASMC,based on the nonlinear dynamic model of the robot and its actuators,is used to guarantee the stability and the convergence of the closed-loop ***,by employing the advantages of the fuzzy logic systems,the developed controller ensures the robustness of the system against dynamic disturbances and uncertainties,the smoothness of the computing voltage against the chattering phenomenon,and the optimal convergence of the velocity and posture *** Lyapunov theory is used to analyse the stability of this *** order to evaluate the effectiveness of the developed method,numerical simulations are done in the Mahlab/Simulink environment.

关键词： Fuzzy adaptive sliding mode controller uncertainties and disturbances computing input voltage electrically driven WMR Lyapunov theory

Simulation of grid connection and maximum power point tracking control of brushless doubly-fed generator in wind power system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第3期7卷 380-387页

作者： hicham SERHOUD Djilani BENATTOUS Institute of Science Technology Department of ElectrotechnicsUniversity of EL-Oued

In this paper,based on the analysis of the mathematical model in a common synchronous reference frame of the brushless doubly-fed generator(BDFG),the grid connection strategy and maximum energy extraction control were both ***,the transient simulation of no-load model and generation model of the BDFG have been developed on the MATLAB/Simulink *** test results during cutting-in grid confirmed the good dynamic performance of grid synchronization and effective power control approach for the BDFG-based variable speed wind turbines.

关键词： brushless doubly-fed generator (BDFG) modeling grid connection control back-to-back pulse-width modulation (PWM) converter wind power generation