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Search Results: 1 - 10 of 840 matches for " Abdoul Kadri Diallo "
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Electrical Instability in Pentacene Transistors with Mylar and PMMA/Mylar Gate Dielectrics Transferred by Lamination Process  [PDF]
Abdou Karim Diallo, Abdoul Kadri Diallo, Diouma Kobor, Marcel Pasquinelli
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47125
Abstract: This study deals with electrical instability under bias stress in pentacene-based transistors with gate dielectrics deposited by a lamination process. Mylar film is laminated onto a polyethylene terephthalate (PET) substrate, on which aluminum (Al) gate is deposited, followed by evaporation of organic semiconductor and gold (Au) source/drain contacts in bottom gate top contact configuration (Device 1). In order to compare the influence of the semiconductor/dielectric interface, a second organic transistor (Device 2) which is different from the Device 1 by the deposition of an intermediate layer of polymethyl methacrylate (PMMA) onto the laminated Mylar dielectric and before evaporating pentacene layer is fabricated. The critical device parameters such as threshold voltage (VT), subthreshold slope (S), mobility (μ), onset voltage (Von) and Ion/Ioff ratio have been studied. The results showed that the recorded hysteresis depend on the pentacene morphology. Moreover, after bias stress application, the electrical parameters are highly modified for both devices according to the regimes in which the transistors are operating. In ON state regime, Device 1 showed a pronounced threshold voltage shift associated to charge trapping, while keeping the μ, Ioff current and S minimally affected. Regardless of whether Device 2 exhibited better electrical performances and stability in ON state, we observed a bias stress-induced increase of depletion current and subthreshold slope in subthreshold region, a sign of defect creation. Both devices showed onset voltage shift in opposite direction.
Optimization of 6,13Bis(triisopropylsilylethynyl)pentacene (TIPS-Pentacene) Organic Field Effect Transistor: Annealing Temperature and Solvent Effects  [PDF]
Diallo Abdoul Kadri, Diallo Abdou Karim, Mané Seck, Kobor Diouma, Pasquinelli Marcel
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.911065
Abstract: In this contribution, we report on the effect of solvents with different boiling points and annealing temperature on the performance of TIPS-pentacene transistors. Several solvents have been used for TIPS-pentacene thin film processing: toluene, chlorobenzene and tetrahy-drofuran. To study the influence of solvent and temperature; the electrical parameters of TIPS-pentacene field effect transistor were measured. The highest values of mobilities were 7.1 × 10-3 cm2·V-1·s-1, 4.5 × 10-3?cm2·V-1·s-1 and 1.43 × 10-3 cm2·V-1·s-1 respectively for TIPS-pentacene field effect transistor using chlorobenzene, toluene and tetrahydrofuran and annealed respectively at 120°C, 150°C and 120°C. We have correlated these electrical performances with AFM images in order to point out the role of morphological properties. It is found that the grain size, and roughness highly affect the electrical parameters.
Bilateral Fracture of the Base of the Fifth Metatarsal. A Case Report and Review of the Literature  [PDF]
Mahamadou Diallo, Layes Toure, Louis Traoré, Abdoul Kadri Moussa, Seydina Alioune Beye, Mosséré Camara, Mahamadou Kane, Tiéman Coulibaly
Surgical Science (SS) , 2020, DOI: 10.4236/ss.2020.112005
Abstract: We report an unusual case of basic bilateral fracture of fifth metatarsals in a 48 years old post-menopausal woman. She had previously been treated for arterial high blood pressure, parathyroidectomy and rheumatoid arthritis by a long corticotherapy treatment. The lesion was caused by an indirect mechanism in an overweight context. The diagnosis of a pseudarthrosis of the base of the fifth metatarsals was maintained after 7-month treatment. The patient received a treatment of both pseudarthrosis. The post-operative periods were simple. After a 9-month follow-up, the treatment allowed consolidation with painless feet allowing her to resume work.
Phosphorus Based Ceramics for Positive Electrode Synthesis and Characterization  [PDF]
Diouma Kobor, Abdou Kadri Diallo, Modou Tine
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.515147
Abstract: Historically, the LiCoO2 is the most used as active material for battery positive electrode because of its great potential (3.7 - 4.2 V), its interesting specific capacity (150 mA·h·g-1) and its excellent life cycle [1]. However, its toxicity, the cobalt cost and its structural instability oriented research towards new materials more stable that can replace it. In another context, hybrid, electrical vehicles and communication (computers and mobile phones...) have increased the scientific and technological research for new materials capable of storing and return energy through a system called accumulator. And research has identified the phosphate olivine structure as the most prolific ceramic material for positive electrode. LiFePO4 is a promising cathode material for Lithium-ion batteries. It provides high thermal stability and is synthesized using low cost materials. Unfortunately LiFePO4 suffers from a low electrical conductivity, which is harmful to its electrochemical performance. Decreasing the particle size, coating the particles with carbon or doping with metal atoms can increase the conductivity of the material. In this paper, we present the synthesis, physico-chemical and electrical characterization of lithium and iron doped Al-phosphorrus-based ceramic. The NPK Fertiliser was used as Al and phosphorus precursors. The powder XRD spectrum shows a possible presence of LiFePO4 and Fe2(PO)3 in theheterostrcture. An important quantity of Al is found by EDX spectra which supposed that the most important based atom is Aluminum and not Phosphorus. This can explain the increase of the conductivity value 102 times more important than those found in the literature for LiFePO4.
Molar Ectopic Pregnancy: A Case Study from the Maternity Unit of the Bobo-Dioulasso Teaching Hospital  [PDF]
Bambara Moussa, Diallo Abdoul Azize, Lompo Olga Goumbri
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.613102
Abstract: The authors reported a case of molar ectopic pregnancy seen and managed at the maternity unit of the Bobo-Dioulasso Teaching Hospital. The frequency of the molar ectopic pregnancy is difficult to assess. Besides, the histopathological examination of surgical specimen of the salpingectomy is not usual in our setting. For the management, we realized a total left salpingectomy with a histopathological examination of surgical specimens in association with serum b HCG follow up. During post operations period, the patient was put on estro-progestin contraception for a year, a regular checkup of the biological marker of the molar pregnancy till negativation, a clinical, ultrasound and radiological checkup. No anomaly was noticed at the end of the follow up.
Dualistic Structures on Twisted Product Manifolds
Abdoul Salam Diallo,Leonard Todjihounde
Mathematics , 2014,
Abstract: In this paper, we show that the projection of a dualistic structure defined on a twisted product manifold induces dualistic structures on the base and the fiber manifolds, and conversely. Then under some conditions on the Ricci curvature and the Weyl conformal tensor we characterize dually flat structures on twisted product manifolds.
Preventive Exchange Blood Transfusion in Pregnant Women with Sickle Cell Disease: Maternal and Perinatal Prognosis in a Country with Limited Resources, Burkina Faso  [PDF]
Hyacinthe Zamané, Dantola Paul Kain, Sibraogo Kiemtoré, Abdoul Azize Diallo, Jean Baptiste Valéa, Samba Diallo, Fabienne Sanou, Jean Lankoandé
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.66048
Abstract: Context: In pregnant women with sickle cell disease, the management with exchange transfusion could be useful in improving the prognosis of mother and child by reducing the level of hemoglobin S less than 40%. Objective: To analyze the maternal and perinatal outcome during the program of the exchange transfusion in pregnant women with sickle cell disease. Patients and Methods: We conducted a prospective study over a period of 18 months. Pregnant women with a major form of sickle cell disease were included. A manual blood exchange transfusion was performed monthly. We monitored the occurrence of maternal and perinatal morbidity during the follow-up. Results: A total of 42 pregnant women with sickle cell disease were monitored. The frequency of infectious episodes and vaso-occlusive crisis was significantly reduced, respectively from 47.6% and 83.3% before the beginning of the blood exchanges transfusion to 11.9% and 16.7% during blood exchanges transfusion program. All newborns were alive at birth with an Apgar score higher or equal to 7 at the 5th minute. The rate of admission of the newborns at neonatal intensive care unit was 9.3%. Maternal mortality was estimated at 7.1% and there was no early neonatal mortality. Conclusion: Prophylactic exchange transfusion reduces infections and the reoccurrence of vaso-occlusive crisis, which has an impact on perinatal prognosis.
Mobile and Context-Aware GeoBI Applications: A Multilevel Model for Structuring and Sharing of Contextual Information  [PDF]
Belko Abdoul Aziz Diallo, Thierry Badard, Frédéric Hubert, Sylvie Daniel
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.45048
Abstract: With the requirements for high performance results in the today’s mobile, global, highly competitive, and technology-based business world, business professionals have to get supported by convenient mobile decision support systems (DSS). To give an improved support to mobile business professionals, it is necessary to go further than just allowing a simple remote access to a Business Intelligence platform. In this paper, the need for actual context-aware mobile Geospatial Business Intelligence (GeoBI) systems that can help capture, filter, organize and structure the user mobile context is exposed and justified. Furthermore, since capturing, structuring, and modeling mobile contextual information is still a research issue, a wide inventory of existing research work on context and mobile context is provided. Then, step by step, we methodologically identify relevant contextual information to capture for mobility purposes as well as for BI needs, organize them into context-dimensions, and build a hierarchical mobile GeoBI context model which (1) is geo-spatial-extended, (2) fits with human perception of mobility, (3) takes into account the local context interactions and information-sharing with remote contexts, and (4) matches with the usual hierarchical aggregated structure of BI data.
An OWL-Based Mobile GeoBI Context Ontology Enabling Location-Based and Context-Based Reasoning and Supporting Contextual Business Analysis  [PDF]
Belko Abdoul Aziz Diallo, Thierry Badard, Frédéric Hubert, Sylvie Daniel
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.61007
Abstract: Mobile professionals need to be assisted with suitable mobile GeoBI (Geospatial Business Intelligence) systems, which are able to capture, organize and structure the user’s reality into a relevant context model and reason on it. GeoBI context modelling and reasoning are still research issues since there is not yet either a model or a relevant taxonomy regarding GeoBI contextual information. To fill this gap, this paper proposes an extended and detailed OWL-based mobile GeoBI context ontology to provide context-aware applications and users with relevant contextual information and context-based reasoning capabilities. Context quality issues are handled an implementation architecture which is provided.
Sexual Assault in the Department of Obstetrics and Gynaecology of the Bamako’s 5th Municipality Medical Center  [PDF]
Bambara Moussa, Coulibaly Karim, Diallo Abdoul Aziz, Ouattara Adama, Zampaligré Idrissa
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.611082
Abstract: Background: The authors report cases of sexual assault reported to the obstetrics and gynecology department of the Bamako’s 5th municipality medical center during a prospective study of eight months from 1st January to 31st August 31st, 2012. Results: Twenty-one cases of assault were reported out of a total of 13,482 consultations, representing a frequency of 0%, 15%. Most victims were represented by students and accounted 43% of the study population. In 76% of cases the victims knew their assailant. The type of sexual contact was genito-genital vaginal penetration in 67% of cases and the condom was used in only one case. The average time before consultation was 3 days. The preventive ARV treatment was administered in 24% of cases and emergency contraception in 43% of cases. Conclusion: Sexual assault is common in Bamako. The reality is probably underestimated because many cases are not reported. The victims are mostly children and adolescents. The risk of transmission of STIs and HIV is very high during the sexual assault. Education and awareness of the population are essential for early consultation. Training of health workers to care for victims of sexual assault is needed.
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