检索结果-南通市图书馆

Trends of Land Use and Land Cover Change in the Savannah Ecological of the Protected Area Reserve Partielle de Dosso, Niger

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Resources 2024年第3期15卷 61-68页

作者： Amadou Issoufou Abdourhimou Moussa boubacar Habou Rabiou Soumana idrissa Mahamane Ali Faculté des Sciences Agronomiques Université de Diffa Diffa Niger Institut National de la Recherche Agronomique du Niger Niamey Niger Faculté des Sciences et Techniques Université Abdou Moumouni de Niamey Niamey Niger

Information on the dynamics of savannah is important to a country's plan to overcome the problems of uncontrolled development and environmental hazards. Taking the reserve partielle de Dosso, Niger as the case study area, this paper analyzed the long-term land use land cover change from 2002 to 2022. Satellite images were processed by using Google Earth Engine (GEE). Therefore, four major land cover classes were identified based on spectral characteristics of Land sat, namely, built-up, vegetation, cropland, bare land and water. The result revealed that barren and built-up areas increased at the expense of vegetation and water. From the four major land use land cover the large area is covered by vegetation which comprises about 192963.5 hectares followed by cropland and water consisting of 32506.43 and 1596.4 hectares respectively. The built-up area gained substantial area (most) during the study period. The reduction in some of the land cover/uses underlines the dangerous trend of the pressure poised by population growth and the changing functionality. Land cover change is influenced by a variety of societal factors operating on several spatial and temporal levels. The area estimates and spatial distributions of the LULC classes produced from the current study will assist local authorities, managers, and other stakeholders in decision-making and planning regarding forest land cover and uses.

关键词： Land Use/Cover Change Detection Classification Dosso

Corrective Effect of the Angle of Incidence of the Magnetic Field Intensity on the Performance (Series and Shunt Resistances) of a Bifacial Silicon Solar Cell

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Power Engineering 2024年第9期16卷 313-323页

作者： idrissa Sourabié Mahamadi Savadogo boubacar Soro Ramatou Saré Christian Zoundi Martial Zoungrana Issa Zerbo Laboratoire de Chimie Analytique de Physique Spatiale et nergtique (L@CAPSE) Ecole Doctorale Sciences et Technologies Universit Norbert ZONGO Koudougou Burkina Faso Laboratoire dEnergies Thermiques Renouvelables (L.E.T.RE) Ecole Doctorale Sciences et Technologies Universit Joseph KI-ZERBO Ouagadougou Burkina Faso

This article presents a three-dimensional analysis of the impact of the angle of incidence of the magnetic field intensity on the electrical performance (series resistance, shunt resistance) of a bifacial polycrystalline silicon solar cell. The cell is illuminated simultaneously from both sides. The continuity equation for the excess minority carriers is solved at the emitter and at the depth of the base respectively. The analytical expressions for photocurrent density, photovoltage, series resistance and shunt resistance were deduced. Using these expressions, the values of the series and shunt resistances were extracted for different values of the angle of incidence of the magnetic field intensity. The study shows that as the angle of incidence increases, the slopes of the minority carrier density for the two modes of operation of the solar cell decrease. This is explained by a drop in the accumulation of carriers in the area close to the junction due to the fact that the Lorentz force is unable to drive the carriers towards the lateral surfaces due to the weak action of the magnetic field, which tends to cancel out as the incidence angle increases, and consequently a drop in the open circuit photovoltage. This, in turn, reduces the Lorentz force. These results predict that the p-n junction of the solar cell will not heat up. The study also showed a decrease in series resistance as the incidence angle of the magnetic field intensity increased from 0 rad to π/2 rad and an increase in shunt resistance as the incidence angle increased. His behaviour of the electrical parameters when the angle of incidence of the field from 0 rad to π/2 rad shows that the decreasing magnetic field vector tends to be collinear with the electron trajectory. This allows them to cross the junction and participate in the external current. The best orientation for the Lorentz force is zero, in which case the carriers can move easily towards the junction.

关键词： Angle of Incidence Magnetic Field Intensity Bifacial Polycrystalline Silicon Solar Cell Series Resistance Shunt Resistance

Fascist Leg Necrosis at the Bocar Sidi Sall University Hospital (BSS) in Kati (Mali)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2022年第3期13卷 119-123页

作者： Abdoulaye Diarra Assitan Koné Amadou Traoré Koniba Kéïta idrissa tounkara tounkara Issa Traoré Oumou Traoré boubacar karembé Madiassa Konaté Oulématou Coulibaly Modibo Togola Daouda Diallo Alhassane Traoré Bkary Tientigui Dembélé Ibrahim Diakité Adégné Togo Department of General Surgery Kati University Hospital Kati Mali Department of General Surgery CHU Gabriel Touré Bamako Mali Department of Anesthesia and Resuscitation CHU of Kati Kati Mali

Necrotizing fasciitis is a bacterial dermo-hypodermitis of necrotizing type with involvement of the superficial fascia of the muscles. We report the case of a 50-year-old patient with necrotizing fasciitis of the left leg following erysipelas. Clinical Case: A 50-year-old patient, received at the emergency department for necrotizing wound of the left leg, evolving for 25 days. The examination of the patient made it possible to find: an alteration of the general condition with a WHO score classified stage II. A necrotizing wound of the lower 2/3 of the left leg and the dorsal side of the left foot allowing pus to flow in places, the pedious pulse was well perceived, lymphadenopathy at the root of the homolateral thigh. The complete blood count made it possible to objectify a predominantly neutrophil hyperleukocytosis greater than 10,000/mm3. We first carried out a complete debridement of the necrotic tissues, in a second time we took the patient back to do the autocutaneous graft. The surgical follow-up was simple. Conclusion: Necrotizing fasciitis is a serious infection, management is multidisciplinary.

关键词： Necrotizing Fasciitis Lower Limb Kati Mali

Damage to the External Genitalia by Traction Following Assault and Battery at the C.H.U Gabriel Touré: About a Case

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2023年第2期14卷 55-60页

作者： karembé boubacar Traoré Boureima tounkara idrissa Diarra Issaka Coulibaly Mamadou Tidiani Soumaré Modibo Dianguina Coulibaly Abdoulaye Camara Aboubacar Touré Aboubacar Sanogo Seydou Fall Ibrahim Diakité Mané Diarra Mouminy Traoré Abdoulaye Diarra Drissa Diakité Mamadou Lamine Départment of Surgery CHU Gabriel Touré Bamako Mali

Trauma to the external genitalia by tearing is rare. We report the case of a 30-year-old patient, admitted to the emergency room for trauma of the external genitalia by traction following a blow and intentional injury. The authors highlight the lesions that can occur during this type of trauma and insist on the systematic search for urethral and cavernous lesions. Conclusion: Trauma to the external genitalia by intentional assault and battery is rare in our context. They occur most often in a young person and are frequently associated with damage to the corpora cavernosa and urethra.

关键词： Trauma External Genitalia Traction

Digestive Surgical Emergencies at the Commune II Reference Health Centre in the District of Bamako

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2022年第5期13卷 258-264页

作者： idrissa tounkara Abdoulaye Diarra Amadou Traore boubacar karembe Sayon Diakite Konimba Keita Oumar Ongoiba Madiassa Konate Seydou Sangare Bakary Coulibaly Bakary Tientigui Dembele Adegne Togo Reference Health Center of the Municipality II Bamako Mali Hospital-University Center of Kati Kati Mali University Hospital Gabriel Touré Bamako Mali Reference Health Center of the Municipality III Bamako Mali Timbuktu Regional Hospital Timbuktu Mali

We conducted a prospective descriptive study from January 1 to December 31, 2018 with the objectives of determining the frequency of digestive surgical emergencies, describing the clinical and para-clinical aspects of the management of digestive surgical emergencies, evaluating the therapeutic aspect of digestive surgical emergencies and analysing the post-operative follow-up of patients operated on in emergencies. We counted 120 patients operated on for digestive surgical emergencies, which corresponds to 5.80% of all consultations and 44.80% of all surgical interventions. The male sex was the most represented with a ratio of 1.80. The average age was 27.5 years. The majority of patients were from Bamako. Abdominal pain was the reason for consultation in 80% of cases. The diagnosis was essentially clinical and paraclinical in doubtful cases. These included ultrasound, unprepared abdomen and sometimes abdominal CT scans. Acute appendicitis was the most common pathology with 42.5%. General anaesthesia and spinal anaesthesia were used with 50% each. The majority of patients were operated on between 30 minutes and 12 hours after their admission to the department (71.7%). Acute peritonitis accounted for 67% of deaths from sepsis. The surgical technique was decided according to the pathology and the surgeon’s choice. The postoperative course was simple in the majority of cases. The prognosis is good when the management is early. The treatment is medical-surgical.

关键词： Surgical Emergencies Digestive Tract General Surgery CSRéf CII

Traumatic Diaphragmatic Injury at Gabriel Toure University Hospital, Mali

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2022年第3期13卷 110-118页

作者： Amadou Traoré Madiassa Konaté Abdoulaye Diarra idrissa tounkara Mohamed Traoré Arouna Doumbia Amadou Bah boubacar Yoro Sidibé Amadou Maïga Tani Koné boubacar karembé Zakari Saye Koniba Kéita Yacouba Bouaré Assitan Koné Ibrahim Diakité Lassana Kanté Bakary Tientigui Dembélé Alhassane Traoré Adégné Togo General Surgery Department of Gabriel Touré University Hospital Bamako Mali Surgery Department of Kati University Hospital Kati Mali Reference Health Center of Commune II Bamako Mali Reference Health Center of Commune III Bamako Mali

Traumatic diaphragmatic injury (TDI) is rare and is most often the result of a traffic road accident (TRA) or an assault. We initiated this study with the aims of determining the epidemiological, clinical and therapeutic aspects of TDI at Gabriel Toure University Hospital. This was a retrospective study from January 1999 to June 2021 that included all patients who presented a diaphragmatic injury consecutive to abdominal and/or thoracic trauma. In 22 years and 6 months, 46 cases of TDI were collected. They represented 0.17% of hospitalizations, 0.26% of surgical emergencies and 5.5% of thoraco-abdominal traumas. The average age was 31.69 years with a sex ratio of 3.2. Criminal stabbings accounted for 56.5% and TRA for 19.6%. Penetrating injuries accounted for 78.3% of cases. The parietal lesion was thoracic in 21 cases (45.7%), abdominal in 19 cases (41.3%) and thoraco-abdominal in 6 cases (13%). The chest X-ray, performed in 15 patients, showed an intrathoracic gas bubble (4 cases) and hemothorax (6 cases). Diagnosis of diaphragmatic lesion was preoperative in 21.7% (10 cases). The diaphragmatic breach was on the left side in 65.2% (30 cases) and the average size was 3.17 cm. Laparotomy was performed in 89.1%, thoracotomy in 4.4% and thoraco-laparotomy in 6.5% of cases. The surgical procedure consisted of reduction of the herniated viscera in 15.2% (7 cases) and closure of the diaphragmatic breach with non-absorbable sutures in 82.6% (36 cases). Chest tube drainage was performed in 73.9%. The average length of hospital stay was 9.8 days. Mortality was 13.04%. Conclusion: Traumatic diaphragmatic injury is rare but its frequency is increasing in our country. It most often affects the young man victim of assault or TRA. This type of trauma is rarely isolated;you have to think about it in case of any thoraco-abdominal trauma. The treatment is surgical. The prognosis depends on the severity of the associated lesions.

关键词： Diaphragmatic Injury Trauma Surgery Gabriel Toure

Appendicular Abscess: Epidemio-Clinical and Therapeutic Aspects in the General Surgery Department of the Reference Health Center of Commune III (*** CIII) of the District of Bamako

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2023年第2期14卷 77-83页

作者： karembé boubacar tounkara idrissa Diarra Issaka Soumaré Modibo Dianguina Traoré Boureima Sanogo Seydou Diallo Moctar Camara Aboubacar Touré Aboubacar Coulibaly Abdoulaye Fall Ibrahim Diakité Mané Diarra Mouminy Diarra Drissa Traoré Abdoulaye Coulibaly Yacaria Kanté Lassana Dembélé Bakary Tientigui Togo Adégné Départment of Surgery CHU Gabriel Touré Bamako Mali

Objectives: The main goal of this study is to determine the hospital frequency of appendicular abscess, to describe the diagnostic and therapeutic aspects and to analyze the postoperative follow-up. Methodology: This was a descriptive and analytical prospective study from January 1, 2020 to June 30, 2021 including patients admitted to our department for appendicular abscess diagnosed pre- and or intraoperatively and confirmed to histology. Results: We collected 30 appendicular abscesses that accounted for 18.75% of emergency interventions. The 16 - 25 age group was the most represented at 53%. The average age was 24 years with extremes of 10 and 58 years. The male sex was mostly represented (60%) with a sex ratio of 1.5. The majority of our patients were students (53.3%). The main clinical signs found were abdominal pain and vomiting (100%). The pain was localized in the Right Iliac Fossa (RIF) in 80% of cases. Fever was present in all our patients with a temperature between 38˚C and 38.5˚C. The physical examination found pain with defense of the right iliac fossa in 93.3% of cases. A painful mass was present in 27 patients (90%). Treatment consisted of appendectomy with abscess drainage in all patients. Postoperative follow-up was simple in 83.3% of cases;we recorded three cases (10%) of parietal suppuration, one case of fistula (3.3%) and one death. Conclusion: Appendicular abscess is a medical-surgical emergency frequent surgery in our context because of the delay in diagnosis. It is a condition with low morbidity and mortality subject to early diagnosis and prompt and appropriate treatment.

关键词： Abscess Appendix Surgery

Epidemiological-Clinical and Therapeutic Aspects of Acute Appendicitis at the Reference Health Center of Commune III (*** CIII) of the District of Bamako

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2023年第1期14卷 30-37页

作者： karembé boubacar tounkara idrissa Soumaré Modibo Dianguina Diarra Issaka Diarra Mouminy Touré Aboubacar Traoré Boureima Camara Aboubacar Sanogo Seydou Fall Ibrahim Coulibaly Abdoulaye Traoré Abdoulaye Diarra Drissa Diakité Mané Coulibaly Yacaria Kanté Lassana Dembélé Bakary Tientigui Togo Adégné Départment of Surgery CHU Gabriel Touré Bamako Mali

Objectives: It was to determine the epidemiological-clinical and therapeutic aspects of acute appendicitis at the Reference Health Center of Commune III of the district of Bamako. Methodology: This was a prospective study from January 1 to December 31, 2020 including patients operated for acute appendicitis and confirmed at histology and cases of abscess and appendicular plastron. Results: We collected 60 cases of acute appendicitis. They accounted for 17.29% of surgical indications. The average age of our patients was 25.5 years. The male sex was the most represented at 63% with a sex ratio of 1.72. The Pain in the right iliac fossa was the most represented reason for consultation with 76.7%. It was at the type of bite 70% of the cases. On physical examination the defense of the right iliac fossa was present in 96.7%. Digestive signs were marked by nausea 28.4% (17 patients) and vomiting 25% (15 patients). The digital rectal exam was painful to the right of the Douglas fir in 76.7% of our patients. In biology a complete blood count (CBC) performed in all our patients has objectified hyper leukocytosis in 80% of cases. The reactive protein (CRP) performed in 36 patients was elevated with values between 18 and 46 mg/ml. The imaging performed was an abdominal ultrasound that found a roundel image of the appendix with increased size in 65%. Surgical treatment consisted of classical Mac Burney appendectomy in 54 patients (90%). The gesture performed was an appendectomy in all our patients. All our appendectomy parts were sent for pathological examination. This examination classified the parts as non-specific appendicitis in 60%, phlegmonous appendicitis in 22% and catarrhal appendicitis in 18% of cases. Surgical follow-up was simple in 98.4% (59 patients) and morbidity was marked by digestive fistula in one patient. We recorded one case of death (1.6%). Conclusion: Acute appendicitis remains the most common surgical emergency in commune III of the district of Bamako. It

关键词： Appendicitis Surgery Anatomical Pathology

Synchronous Volvulus of the Sigmoid Colon and the Transverse Colon: A Case Report at Gabriel Toure University Hospital in Mali

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2021年第9期12卷 313-318页

作者： Traoré Amadou Konaté Madiassa Diarra Abdoulaye tounkara idrissa Saye Zakari Doumbia Arouna Bah Amadou Sidibé boubacar Yoro Maïga Amadou Koné Tani Thiam Souleymane karembé boubacar Kelly Bouréima Traoré Kadia Kéita Koniba Bouaré Yacouba Koné Assitan Diakité Ibrahim Diakité Ibrahim Dembélé Bakary Tientigui Traoré Alhassane Togo Adégné General Surgery Department Gabriel Touré University Hospital Bamako Mali Surgery Department Kati University Hospital Kati Mali Reference Health Center of Commune III Bamako Mali

Synchronous transverse and sigmoid colon volvulus are very rare. We report the case of a 23-year-old man who underwent emergency surgery for sigmoid colon volvulus. An intraoperative finding of transverse colon volvulus associated with sigmoid colon volvulus was made. Left and transverse colectomy was performed followed by colorectal anastomosis. The postoperative period was uneventful. Synchronous volvulus of the transverse and sigmoid colon is a surgical emergency. The clinical signs are not specific and the discovery is often intraoperative. It is necessary to know how to evoke the diagnosis in a case of sigmoid colon volvulus, to avoid inadequate management with dramatic consequences.

关键词： Volvulus Synchronous Colon Sigmoid Transverse Surgery Mali