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A sliding-neural network control of induction-motor-pump supplied by photovoltaic generator

Protection and Control of Modern Power Systems 2019年第1期4卷 332-348页

作者： Hichem Hamdi Chiheb Ben Regaya abderrahmen zaafouri University of Tunis Higher National Engineering School Of Tunis(ENSIT)Engineering Laboratory of Industrial Systems and Renewable Energies(LISIER)5 avenue Taha HusseinPO Box 561008TunisTunisia

Energy production from renewable sources offers an efficient alternative non-polluting and sustainable solution. Among renewable energies, solar energy represents the most important source, the most efficient and the least expensive compared to other renewable sources. Electric power generation systems from the sun’s energy typically characterized by their low efficiency. However, it is known that photovoltaic pumping systems are the most economical solution especially in rural areas. This work deals with the modeling and the vector control of a solar photovoltaic (PV) pumping system. The main objective of this study is to improve optimization techniques that maximize the overall efficiency of the pumping system. In order to optimize their energy efficiency whatever, the weather conditions, we inserted between the inverter and the photovoltaic generator (GPV) a maximum power point adapter known as Maximum Power Point Tracking (MPPT). Among the various MPPT techniques presented in the literature, we adopted the adaptive neuro-fuzzy controller (ANFIS). In addition, the performance of the sliding vector control associated with the neural network was developed and evaluated. Finally, simulation work under Matlab / Simulink was achieved to examine the performance of a photovoltaic conversion chain intended for pumping and to verify the effectiveness of the speed control under various instructions applied to the system. According to the study, we have done on the improvement of sliding mode control with neural network. Note that the sliding-neuron control provides better results compared to other techniques in terms of improved chattering phenomenon and less deviation from its reference.

关键词： Maximum power point tracking(MPPT) Adaptive Neuro-fuzzy inference systems(ANFIS) Photovoltaic(PV)systems Fuzzy logic controller(FLC) Pump Sliding mode controller

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DYNAMICS OF NEW CLASS OF HOPFIELD NEURAL NETWORKS WITH TIME-VARYING AND DISTRIBUTED DELAYS

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Acta Mathematica Scientia 2016年第3期36卷 891-912页

作者： Adnene ARBI Farouk CHERIF Chaouki AOUITI abderrahmen TOUATI Department of Mathematics Facultd des Sciences de BizerteUniversity of CarthageJarzouna 7021BizerteTunisia Department of Computer Science ISSATSLaboratory of Math PhysicsUniversity of SousseSpecials Functions and Applications LR11ES35ecole suprieure des sciences et de technologieSousse 4002Tunisia

In this paper, we investigate the dynamics and the global exponential stability of a new class of Hopfield neural network with time-varying and distributed delays. In fact, the properties of norms and the contraction principle are adjusted to ensure the existence as well as the uniqueness of the pseudo almost periodic solution, which is also its derivative pseudo almost periodic. This results are without resorting to the theory of exponential dichotomy. Furthermore, by employing the suitable Lyapunov function, some delayindependent sufficient conditions are derived for exponential convergence. The main originality lies in the fact that spaces considered in this paper generalize the notion of periodicity and almost periodicity. Lastly, two examples are given to demonstrate the validity of the proposed theoretical results.

关键词： delayed functional differential equations neural networks pseudo-almost peri- odic solution global exponential stability time-varying and distributed delays fixed point theorem

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A sutureless subconjunctival M-shaped limbus incision for hard cataracts

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International Journal of Ophthalmology(English edition) 2016年第11期9卷 1694-1696页

作者： Ping-Hong Lai Jun Yang Fang Hang Tlili zaafouri Jiangxi Eye Center Jiangxi Provincial People's Hospital Ophthalmology Department the First People's Hospital of Yunnan Province Ophthalmology Department Regional Hospital

Dear Editor,Iam ***-Hong Lai,from the Jiangxi Eye Center,Jiangxi Provincial People＇s Hospital,Nanchang,Jiangxi Province,China.I would like to present the technique of subconjunctival M-shaped limbus incision for a se... 详细信息

关键词： Figure A sutureless subconjunctival M-shaped limbus incision for hard cataracts

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Synthesis, Crystal Structure and Electrical Properties of a New Mixed Compound (Na0.71Ag0.29)2CoP2O7

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Crystal Structure Theory and Applications 2012年第3期1卷 68-73页

作者： Riadh Marzouki abderrahmen Guesmi Mohamed Faouzi Zid Ahmed Driss Département de Chimie Faculté des Sciences Université Tunis El Manar Tunis Tunisie

A new cobalt diphosphate (Na0.71Ag0.29)2CoP2O7, is synthesized by solid state reaction method and characterized by single-crystal X-ray diffraction. The title material crystallizes in the triclinic space group P-1 with a = 6.4170(3) , b = 9.4510(2) , c = 10.9350(3) , a = 115.240(2)o, b = 80.190(3)o and g = 106.810(2)0. The structure presents a centro-symmetrical clusters Co4P4O28 consists of two Co2O11 units and two P2O7 pyrophosphate groups. The junction between clusters is assured by two P2O7 groups to form a three-dimensional anionic framework having different interconnecting tunnels running along [100] and [010]. The former contains the Na+ and Ag+ cations. The conductivity measurements of (Na0.71Ag0.29)2CoP2O7 are studied over a temperature interval from 783 to 903 K using the frequency response analyzer with 0.5 V amplitude signal over the range of 13 MHz - 5 Hz.

关键词： Diphosphate X-Ray Diffraction Anionic Framework Tunnels Conductivity

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Age,growth and length-weight relationship of the rough skate,Raja radula(Linnaeus,1758)(Chondrichthyans:Rajidae),from the Gulf of Gabes(Tunisia,Central Mediterranean)

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Journal of Coastal Life Medicine 2014年第5期 344-349页

作者： Hasna Kadri Sondes Marouani Mohamed Nejmeddine Bradai abderrahmen Bouaïn Eric Morize National Institute of Science and Technology of the Sea SfaxB.P.1035Sfax 3018Tunisia Faculty of Sciences of Sfax BP 8023028 SfaxTunisia Lemar/IRD 230 Broennou 29870 LandédaFrance

Objective:To investigate the length distribution,sex ratio,length-weight relationship,age and growth of Raja radula in the Gulf of ***:The age and growth characteristic of the rough skate(Raja radula)inhabiting in the Gulf of Gabes(Central Mediterranean Sea)was determined.A total of 1250 specimens were *** to the marginal increment band its growth was ***:The growth parameters were derived by using the von-Bertalanffy method and were separately evaluated as follows:TL∞=97.2 cm,K=0.15 y^(-1),t_(o)=0.35,and W_(∞)=5.28 kg,and TL∞=76.4 cm,K=0.22 y^(-1),to=0.16,and W∞=3.77 kg,for females and males *** maximum age was 12 years for females and 10 years for ***:Results from this research will provide a starting point to develop a management plan for the rough skate in the Gulf of *** investigations are necessary to quantify the impact of the existing regulations on the population dynamics and recruitment patterns of this species in the region.

关键词： Age and growth Mediterranean Sea Gulf of Gabes Vertebra Raja radula

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Distribution and morphometric characters of the Mediterranean longnosed skate,Dipturus oxyrinchus(Chondrichthyans:Rajidae)in the Gulf of Gabes(Tunisia,Central Mediterranean)

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Journal of Coastal Life Medicine 2014年第7期 505-510页

Objective:To investigate biometrics of Dipturus oxyrinchus(***),including length-weight relationships,total length(TL),disc width(DW),distance measured of snout tip to eye,width of the mouth,distance from snout tip to first dorsal,and the numeric characters in the Gulf of ***:Monthly sampling was conducted commercial bottom-trawl during December 2006 and January 2007,operating at a depth of 80-185 *** TL,DW,distance of snout tip to eye,width of the mouth,distance from snout tip to first dorsal were measured to the nearest 0.1 cm and the weight was measured to the nearest 0.1 *** parameters a and b were estimated by the least squares regression ***:A total of 520 *** was ranged from 16.5 to 105.0 cm in TL and 30-5300 g in total mass were analyzed during this *** overall sex ratio was significantly different from the expected value of 1:16(df=1,χ^(2)=3.38,P<0.05),and there was significant difference in the TL(t-test=16.53,df=520,P<0.05).There was significant difference in the regression slopes between sexes for the TL and DW relationship(t-test=17.53,df=520,P<0.05).The b value for the TL/weight relationship for males *** sampled in this study(3.01)was lower than that for female(3.23).Morphometric characters were strongly positively correlated for ***:This study reported the first description of biometric relationships for ***,which would be useful for the sustainable conservation of this rear fishery in the Gulf of Gabes and also form the basis for their inclusion in a regional security programme.

关键词： Dipturus oxyrinchus Morphometric and numeric characters Gulf of Gabes Mediterranean Sea

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Age,growth and length-weight relationship of the white skate,Rostroraja alba(Linnaeus,1758)(Chondrichthyans:Rajidae),from the Gulf of Gabes(Tunisia,Central Mediterranean)

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Journal of Coastal Life Medicine 2014年第6期 421-425页

Objective:To investigate the length distribution,sex ratio,length-weight relationship,age and growth of Rostroraja alba in the Gulf of ***:This study estimated age and growth of the white skate,Rostroraja alba by counting vertebral band pairs from 112 specimens taken by commercial fisheries during 2006-2009 from the Gulf of Gabes(Southern Tunisia,Central Mediterranean Sea).Results:This is the first and only known information in regards to the age and growth of this species in *** diameter was strongly correlated with total length and age,which were expressed by linear or cubic regression *** oldest female in this study was 35 years and 160 cm,whereas the oldest male was 32 years and 150 *** von Bertalanffy growth parameters were TL_(∞)=(202.26±3.40)cm,K=(0.040±0.038)/year and t_(0)=(1.84±0.01)10^(-1)/year for females and TL_(∞)=(198.60±3.61)cm,K=(0.060±0.076)/year and t_(0)=(1.28±0.04)/year for ***:This study would be an effective tool for fishery biologists,managers and conservationists to initiate management strategies and regulations for the sustainable conservation of the remaining stocks of this species in the Gulf of Gabes(Southern Tunisia)ecosystem.

关键词： Age and growth Mediterranean Sea Gulf of Gabes Vertebra Rostroraja alba

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Gastric Collision Tumor of Adenocarcinoma and MALT Lymphoma: A Rare Coincidence or Proof of H. pylori Incrimination?

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Surgical Science 2016年第8期7卷 357-360页

作者： Haithem zaafouri Anis Hasnaoui Raja Jouini Dhafer Haddad Ahmed Bouhafa Anis Ben Maamer Department of Surgery Habib Thameur Hospital Tunis Tunisia Department of Histopathology and Cytology Habib Thameur Hospital Tunis Tunisia

Collision tumors of adenocarcinoma and MALT (Mucosa-associated lymphoid tissue) lymphoma are often rare findings of resection specimens of gastric carcinomas. The fact that these two histological lesions are contiguous may suggest a common oncogene. As it is widely known, Helicobacter pylori (H. pylori) plays a leading role in gastric oncogenesis. Could it be responsible for these tumors? As of today, the exact mechanism is still unclear. However, some histological findings may suggest that H. pylori promotes the formation of MALT lymphoma which increases the risk of carcinomatous changes. Prognosis of collision tumors is tightly linked to the carcinoma lesion, which is generally poor due to diagnostic delay. Large scale strategies to eradicate H. pylori and detect early lesions could reduce the mortality of this disease.

关键词： Collision Tumor Gastric Lymphoma Adenocarcinoma Helicobacter pylori

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Primary cancers of the small bowel: About 20 cases

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Open Journal of Gastroenterology 2014年第2期4卷 81-87页

作者： Noomen Haoues Manel Mabrouk Haithem zaafouri Rabii Noomene Ahmed Bouhafa Anis Ben Maamer Abderraouf Cherif Department of General Surgery Habib Thameur Hospital Tunis Tunisia

Background: Cancers of the small bowel are rare. Diagnosis is late and difficult because of the lack of specific signs. Treatment is surgical. Prognosis is usually poor and depends on the histological type of tumor. Aim of Study: To specify the epidemiological, clinical and therapeutic characteristics of small bowel primary cancers in order to improve their prognosis. Material and Methods: This is a retrospective study about 20 cases of malignant tumors of the small bowel, collected in the department of general surgery of Habib Thameur Hospital in Tunis (Tunisia), from January 1994 through June 2011. Results: Our series involved 11 women and 9 men aged 62 on average (range: 44 - 80 years). In 45% of cases, the diagnosis was made in a patient rushed to hospital with clinical features of acute generalized peritonitis (66% of all surgical emergencies). Intestinal transit was performed in 5 patients only. Ultrasound abdominal examination was performed in 11 patients. Abdominal CT scan was performed in 7 patients, but the results were conclusive in 4 cases only (57%). Small bowel scanning was done in 5 patients only, but led to a positive diagnosis in all of them. All of our patients underwent surgery. Tumors of the small bowel were histologically divided as follows: carcinoid tumor (8 cases), leiomyosarcoma (7 cases), giant B-cell lymphoma (2 cases), malignant stromal tumor (2 cases) and malignant myxoid schwannoma (1 case). Malignant tumors of the small bowel most commonly arise in the ileum (60%) followed by the jejunum (35%). As for the long-term course, there was a recurrence at one year of a leiomyosarcoma and two recurrences of stromal tumors associated with liver metastases. Conclusion: Small bowel cancers are rare. Time to consultation is long and diagnosis is difficult and late due to the absence of typical presentation. Treatment is surgical and progression depends essentially on histological findings.

关键词： Primary Cancers Small Bowel Epidemiology Diagnosis

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Pancreatic Gastrointestinal Stromal Tumour: A Case Report and Review of the Literature

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Journal of Cancer Therapy 2017年第11期8卷 954-961页

作者： Daadoucha abderrahmen Farhat Waad Ben Mabrouk Mohamed Harrabi Fathia Azzaza Mohamed Ben Ali Ali Department of Medical Imaging Ibn Al Jazzar University Hospital Kairouan Tunisia Department of Digestive Surgery Sahloul University Hospital Sousse Tunisia

Gastrointestinal stromal tumours (GIST) are rare mesenchymal neoplasms that can develop in the entire length of the gastrointestinal tract or sometimes from the omentum and mesentery. In most cases, they arise from the stomach, less often the jejunum or ileum. We report the case of a 53-year-old-female patient, without significant medical history, consulting for chronic epigastric pain, with no other associated signs. She had underwent an abdominal ultrasound completed with a Contrast-enhanced computed tomography (CT) of the abdomen showing a large tissular mass developed at the expense of the cephalic portion of the pancreas, with central calcifications and heterogeneous enhancement after contrast injection. Pancreaticoduodenectomy, partial colectomy and antrectomy has been performed and histological examination with immunohistochemical study had concluded the diagnosis of pancreatic primary GIST.

关键词： Stromal Tumor Pancreas Imaging Histopathology

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