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Neural Network Based Adaptive Tracking Control for a Class of Pure Feedback Nonlinear Systems With Input Saturation

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IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 278-290页

作者： nassira Zerari Mohamed Chemachema Najib Essounbouli the Department of Electronics Faculty of TechnologyUniversity of Constantine1 CReSTIC Laboratory University of Reims Champagne Ardennes

In this paper, an adaptive neural networks(NNs)tracking controller is proposed for a class of single-input/singleoutput(SISO) non-affine pure-feedback non-linear systems with input saturation. In the proposed approach, the original input saturated nonlinear system is augmented by a low pass ***, new system states are introduced to implement states transformation of the augmented model. The resulting new model in affine Brunovsky form permits direct and simpler controller design by avoiding back-stepping technique and its complexity growing as done in existing methods in the *** controller design of the proposed approach, a state observer,based on the strictly positive real(SPR) theory, is introduced and designed to estimate the new system states, and only two neural networks are used to approximate the uncertain nonlinearities and compensate for the saturation nonlinearity of actuator. The proposed approach can not only provide a simple and effective way for construction of the controller in adaptive neural networks control of non-affine systems with input saturation, but also guarantee the tracking performance and the boundedness of all the signals in the closed-loop system. The stability of the control system is investigated by using the Lyapunov theory. Simulation examples are presented to show the effectiveness of the proposed controller.

关键词： Adaptive control input saturation neural networks systems (NNs) nonlinear pure-feedback

Affective Responses of Early Life Photoperiod in Male Wistar Rats

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Neuroscience & Medicine 2011年第3期2卷 185-191页

作者： nassira Benabid Ali Ouichou 不详

Behavior changes season dependant are probably linked to change in day length or photoperiod. Although much research on seasonality in small mammals has focused on photoperiod manipulations in adults, early life photoperiod is also an important source of seasonal information and can establish individual’s developmental trajectory by regulating somatic and reproductive development and affective responses to day lengths later in life. The experiments developed in this work are based on the hypothesis that early life photoperiod affect emotionality in adult rats. To cheek this hypothesis, male rats were exposed at birth to different photoperiods (LP: 16L/8D;SP: 8L/16D). 8, 16 or 24 weeks later, rats were subjected to different behavioral tests to quantify anxiety-like behavior. Independently of duration, rats exposed to SP exhibited higher levels of anxious-like behavior than rats raised in LP, in an open field test (OFT) and in elevated plus maze (EPM). Repeated comparisons showed that photoperiod effect was accentuated after 16 weeks of treatment. 24 weeks of treatment failed to induce any effect on emotionality in male rats. Our results indicate that changes in day length are associated with different levels of anxious-like behaviors;consistent with the conjecture that early life photoperiod may influence affective behavior in adult male rats.

关键词： Photoperiod Early Life Photoperiod Anxiety-Like Behavior

Insecticidal Activity of <i>Bacillus thuringiensis</i>on Larvae and Adults of <i>Bactrocera oleae Gmelin</i>(Diptera:Tephritidae)

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Journal of Environmental Protection 2013年第5期4卷 480-485页

作者： Faiza Ilias nassira Gaouar Kanza Medjdoub Mireille Kallassy Awad Faculty of Science Saint- Joseph University Beirut Lebanon Laboratory of Ecology and Management of Natural Ecosystems Tlemcen University Tlemcen Algeria

The olive fruit fly Bactrocera oleae is a major olive pest in Algeriaand other Mediterranean countries. Its attacks, in some cases, seriously compromised production. Bacillus thuringiensis is a spore-forming soil bacterium which produces a protein crystal toxic to some insects. The objective of this study was to search for isolates toxic to larvae and adults of B. oleae. Four doses test were performed on neonate larvae, second instar larvae and third instar larvae. Seven Bt strains examined, showed highest toxicity levels against adults. 86% mortality was observed against neonate larvae after 7 days of application by Bt toxin isolate. The mortality of the second instar larvae was 65% mortality at dose of 108 UFC/mL. The third instar larvae was very susceptible to Bt strain with 70% of mortality. This study demonstrated that some local Algerian B. thuringiensis isolates exhibit toxic potential that could be used to control B. oleae.

关键词： Bacillus thuringiensis Bactrocera oleae Insecticidal Activity Olive fly Diptera

Experience of Menopause for Women in the Niamey Region, Republic of Niger

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Open Journal of Obstetrics and Gynecology 2022年第11期12卷 1147-1154页

作者： Rahamatou Madeleine Garba Daddy Gaoh nassira Salamatou Guédé Hamidou Soumana Diaouga Nafiou Idi Maina Oumara Madi Nayama Niger-Turkey Friendship Hospital Niamey Niger Abdou Moumouni University Niamey Niger Issaka Gazobi Maternity Hospital in Niamey Niger General Reference Hospital of Niamey Niamey Niger

Introduction: Menopause is poorly documented in Africa. For most of the women living there, the experience of this period does not seem to be very problematic. For women living in rural areas, other concerns are more prominent. Methods: The study was prospective, quantitative and qualitative about 500 cases collected over a period of 6 months. The study involved postmenopausal women in the Niamey region of public services, in certain residential areas, or accompanying people in health structures. Parameters taken into account were sociocultural, antecedents, experience, knowledge, and management of menopause. The data was entered and analyzed using Microsoft Office Word 2010 and Microsoft Office Excel 2010 software. Results: The average age was 56.4 years with extremes of 40 and 80 years;57% were still living with their husbands and 39% widows;60.2% housewives;53% uneducated, 17% have higher education;60.2% had had at least 6 children and 39.6% had used contraception. The comorbidities observed were arterial hypertension (24.4%) and diabetes (7%). As for the representation that women made of menopause, for all of them, this stage is the beginning of old age. The most frequent signs were asthenia (86.2%) and mood disorders (70.6%). Almost all of the patients (99.8%) had not used hormonal treatment for the menopause and among them 27% the management of the menopause was with traditional means. Conclusion: Menopausal disorders are certainly a reality in our socio-cultural context. They are not a primary concern either through ignorance or resignation of the women concerned.

关键词： Menopausal Experience Climacteric Syndrome HTM Niamey

Etiological Factors of Infective Endocarditis in Children Aged 1 Month to 15 Years Hospitalised in the Paediatric Department of CHU Gabriel Touréof Bamako (Mali)

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World Journal of Cardiovascular Surgery 2022年第2期12卷 13-20页

作者： Maiga Belco Sacko Karamoko Konaté Djéneba Diakité Abdoul Aziz Dembélé Adama Cissé Mohamed Elmouloud DansoKo nassira Traoré Kalilou Togo Pierre Doumbia Abdou Karim Traoré Fousseini Diakité Fatoumata Léonie Sidibé Lalla Maiga Leila Ahmadou Ibrahim Coulibaly Oumar Diall Hawa Sylla Mariam Department of Pediatrics CHU Gabriel Touré Bamako Mali

Introduction: In emerging countries where studies are rarer, the epidemiological profile of infective endocarditis resembles that of developed countries at the beginning of the antibiotic era. There is little data available in Mali on this subject, motivating this study, the aim of which was to study the etiological factors of infective endocarditis in children aged between 1 month and 15 years hospitalised in the paediatric department of the CHU Gabriel Touré. Patients and Methods: We conducted a cross-sectional and descriptive study, which took place from August 2018 to August 2019 (13 months), in children aged between 1 month and 15 years hospitalised in the paediatric department of the Gabriel Touré University Hospital with an ultrasound- confirmed cardiac disease and a temperature above 38°C. Results: The hospitalization rate was 0.4%. The average age was 11 months, the sex ratio was 1.35. Respiratory distress (63.6%) and fever (30.3%) were the most common reasons for referral. Congenital heart disease (87.9%) and dyspnoea on feeding (24.2%) were the most common medical histories. IVC was the most frequent congenital heart disease (36.4%). The mean temperature was 39.1°C. Blood cultures were taken in 24 patients (72.7%) and were positive in 27.3%. Staphylococcus aureus was found in 55.6% of cases. Trans-thoracic ultrasound found vegetations in 03 cases. According to the modified DUKE criteria, the diagnosis of endocarditis was retained in 27.30%. The evolution was marked by a high case fatality rate (45.45%). Conclusion: Endocarditis is an uncommon disease in children with a pulmonary portal of entry and Staphylococcus aureus as the main germ. Its mortality remains high.

关键词： Infective Endocarditis Etiological Factors Pediatrics Bamako