Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 73 )

2019 ( 748 )

2018 ( 841 )

2017 ( 775 )

Custom range...

Search Results: 1 - 10 of 462204 matches for " A Ndiaye "
All listed articles are free for downloading (OA Articles)
Page 1 /462204
Display every page Item
Occlusive Syndrome Revealing a Nonseminoma Germ Cell Tumor Metastatic Testicular  [PDF]
N. M. Diagne Gueye, R. Kane, Y. Diallo, A. R. Ndiaye, A. R. Ndiaye
Open Journal of Urology (OJU) , 2016, DOI: 10.4236/oju.2016.69024
Abstract: Testicular cancer is rare. The authors report the case of a young Senegalese 21, who has consulted for an occlusive syndrome evolving for 48 hours that prompted his hospitalization. Note that the patient has consulted several times to persistent inguinal scrotal pain, a big right purse with chronic analgesic requirements and anti-inflammatory. Occlusive before this table, abdominal pelvic CT was performed and highlighted the presence of lung metastases, a large pelvic lymph node casting bridging the inter vesico-rectal space and responsible for extrinsic compression of the small intestine, lymph node inter casting aorto-cellar and latero aortic liver and multiple secondary locations. Faced with this bundle of arguments, clinical and laboratory, metastatic testicular tumor was raised and measured tumor markers. A right orchiectomy by inguinal was made with histology: A non-seminomatous germ cell tumor stage III. After orchiectomy germinal markers were still high and there was the problem of persistent occlusive syndrome despite resuscitation. A chemotherapy regimen was initiated with 4 cycles of chemotherapy according to the protocol BEP (bleomycin, etoposide, cisplatin). A significant regression of occlusive syndrome with a decline in clinical symptoms was noted. The revaluation at 3 months, 6 months and 1 year were highlighted: A normal clinical examination associated with a persistent correction rate of germline markers and lack of active lesion at thoraco-abdominopelvic CT.
Structural Diversity of Woody Species in the Senegalese Semi-Arid Zone—Ferlo  [PDF]
Ousmane Ndiaye, Aly Diallo, Stephen A. Wood, Aliou Guisse
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.53055

The combined effects of climate change and human pressure have led to the progressive degradation of natural resources in semi-arid regions. Woody taxa in these regions play an important role in the functioning and services provided by semi-arid savannah by serving as forage for both domestic and non-domestic grazers. Maintaining the functioning of semi-arid savannas thus requires understanding the dynamics of these communities of woody taxa and their responses to exogenous forces, such as climate. To better understand the dynamics of woody taxa in semi-arid environments we collected dendrometric characteristics from five field sites along an environmental gradient in the Ferlo region of central Senegal. Density and basal area were found to be greater in the northern part of the zone, contrasted with the distance between individuals and crown cover, which is greater in the southern part of the zone. Stand structure estimated from the distribution according to height and diameter at breast height shows a preponderance of individuals in the shrub layer, although with a significant representation of the tree layer in southern Ferlo. Stand regeneration was better in the south and less effective in the north. There was a trend towards the rejuvenation of populations belonging to the dominant species. There were only three species for which degradation was not apparent (Balanites aegyptiaca, Acacia raddiana and Dalbergia melanoxylon), all of which have important ethnobotanical uses, suggesting that human use of taxa can play an important role in preventing degradation. Three distinct groups of woody taxa were found to correspond to gradients of precipitation, topography, and human land use pressure. Our results suggest an important role in the management and reintroduction of woody species in the Sahel and the regulation of pastoral techniques necessary for the rehabilitation of the agro-pastoral zone of Senegal.

Public Spending and Growth in the Countries of the Economic Community of West African States  [PDF]
Amath Ndiaye
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.911122
Abstract: Our research focuses on the impact of government spending on economic growth in the countries of the Economic Community of West African States (ECOWAS). It draws on new theories of endogenous growth, and more specifically on Rajhi model. After the tests of specification, an ARDL model was estimated for each of the countries which have cointegration relationships. For those whose cointegration relationship does not exist, a VAR estimate was made. So according to estimates, Total Public Spending in most of the countries of ECOWAS has not positive influence on the economic growth as well in the short term as in the long term. Also in most of the countries, Public Consumption did not positively affect economic growth as well in the long run as in the short run. Regarding Public Investment, we have the same results; it does not positively affects economic growth in most of the ECOWAS countries. Burkina Faso, Guinea and Ivory Coast are the three excepted countries where Total Public Spending has a positive effect on GDP growth in the long term but not in the short run. For further analysis we looked at Public Consumption and Public Investment. It is only in four out of ten countries of the sample that, we found that Public Consumption expenditures positively affect economic growth in the short term while the impact generally is negative in the long term. Regarding Public investment, it is only in three out of ten countries (Burkina Faso, Cote d’Ivoire, Ghana), that it was found determinant to economic growth in the long term.
Cam-Clay Models Using Castem 2000© and Plaxis© for the Study of the Slope Stability of the “Corniche Ouest” of the Dakar Peninsula (Senegal, West Africa)  [PDF]
Meissa Fall, Serigne Sam Samb, Mapathé Ndiaye, Oustasse A. Sall, Fatou Samb
Geomaterials (GM) , 2011, DOI: 10.4236/gm.2011.12009
Abstract: The stability of the natural slopes of the “Corniche Ouest” of Dakar Capital was intensively researched by previous [1] in [2] and recent studies [3]. Soils near the surface consist of weathered lateritic cuirass, silt and marl that have been intensively altered and fractured. Below these altered layers are limestones that are interbedded with other thin volcanic layers. Prior to the 1950s the area had been less urbanized. In the 1950s demand for habitations and administrative offices led to the development of the area but, no drainage system was available. In 1984 the area began moving down slope toward the ocean. Rates of movement were the fastest several months after the end of the rainy season and the slowest during the dry season. In the next years the earthflow moved as much as some meters, but in the processes the expensive homes and administrative buildings built became uninhabitable. Movement was caused by a combination of wave erosion along the coast removing some the mass resisting flow, added water due to the disposal of wastes, watering of lawns, and rainfall causing the clays to expand and weaken, and by the added weight of development on top of the flow. The first investigations, due to a lack of geotechnical information describe a stable area even though it was observed cracks and failure in habitations. The main results obtained were specially obtained by analytical techniques of slices. It is well known that the mechanical response of a solid mass of soil depends primarily on the laws of behavior which were affected to him. The Cam-Clay model is used with two comparative numerical codes such as Castem 2000©, a non commercial code and Plaxis 7.2© so as to compare the mechanical response of the slopes. The models of Cambridge are founded as simple theory and use only some soil mechanical parameters easy to determine. The results are founded highly different from a code to another, but they attest all that the system described is non stable. Otherwise, this study has shown that Castem 2000© gives no realistic outputs as well as the soil behavior laws varies from a simple MohrCoulomb law to the softening or hardening complex laws.
Use of Cannabis by Young People and Psychopathological Disorders, in Fatick (Senegal)  [PDF]
Lamine Fall, Ousmane Sy, Ndeye Diale Ndiaye-Ndongo, A?da Sylla
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.54037

Background: Despite progressive increasing of drug use or drug addiction particularly with cannabis in young people, knowledge is limited about their consequences on mental health in adulthood. In Fatick (Senegal), the mental health hospital “Dalal Xel” receives many young people who present psychiatric troubles necessitating a hospitalisation. Frequently, their history reveals use or abuse of cannabis joined sometimes with other drug. Method: From a study concerning period going from January 2010 to December 2013, the authors attempt to define the rate of cannabis users in the study’s population. Next, they seek to describe their social and familial characteristics, and the modality of cannabis use. Finally, they attempt to make correlations between use of cannabis and diagnostic delivered by doctors. Results: 9.13% of patients who are received during the study’s period report personal cannabis use. The middle delay between the first use of cannabis and the first apparition of psychiatric troubles is 4 years and 8 months. The diagnostic of acute delirious episode (BDA in French) is frequently evocated about a first episode or recidivism. Evolution respects classic report of 1/3 (good, bad and indeterminate). Schizophrenia is also evocated in non negligible proportion, particularly in early and prolonged use of cannabis. Conclusion: Psychopathological disorders are frequent among adolescents and young adults who are hospitalised in the psychiatric hospital of Fatick. Use of cannabis in long term seems to provide particularly psychosis.

Advanced Bladder Cancer in Senegal: Epidemiological and Clinical Aspects  [PDF]
R. Kane, L. Niang, Y. Diallo, M. Jalloh, A. Ndiaye, S. M. Gueye
Open Journal of Urology (OJU) , 2014, DOI: 10.4236/oju.2014.411022

Advanced bladder cancer remains particularly frequent in our practice. Aim: To evaluate the proportion of advanced bladder cancer at diagnosis and to describe the characterisitics at diagnosis. Materials and methods: We conducted a descriptive and retrospective study assessing 97 cases of advanced bladder cancer over a period of 10 years (January 2002 to January 2012) at the department of Urology of H?pital Principal de Dakar and H?pital Général de Grand Yoff. We included the records of all patients with a pathologic confirmation of locally advanced bladder cancer (T3, T4) and/or a visceral or lymph node metastasis. Results: Mean age was 47 years (Range: 25 - 80 years). The cohort comprised 69 men and 28 women with a sex ratio of 2.46. The reasons for referral were a hematuria (60.82%), pelvic mass (19.2%), irritative urinary symptoms (8.2%). Reported medical histories were: urinary schistosomiasis (13 patients), tobaccoo(10 patients), recurrent cystitis (8 patients). Indications of local extention were: inguinal lymph nodes (6 patients), tumoral hepatomegaly (5 patients), bone pain (15 patients). A cystoscopy was performed in 64.95% of patients in a mean time of 2.5 months. A Trans Urethral Resection of Bladder Tumour (TURBT) was performed in 77 patients with a mean time from referral of 4 months. Pathologic examination showed squamous cell carcinoma (42%), urothelial carcinoma (28%) and adenocarcinoma (9%). Thoraco-abdomino pelvic CT scan showed a loco regional extension in 18 patients, extension to the peri vesical fat in 3 patients and metastasis in 25 patients. Conclusion: Delayed diagnosis of bladder cancer is still common in Africa with a high mortality rate. A better management requires an improvement of the equipment in the hospital with an emphasis on the access to endoscopy allowing for an early diagnosis.

Child Spinal Cord Compression without Trauma about 113 Cases in Senegal  [PDF]
Nourou Dine A. Bankole, Moustapha Ndiaye, Thioub Mbaye, Youssoupha Sakho, Momar Code Ba
Yangtze Medicine (YM) , 2018, DOI: 10.4236/ym.2018.22013
Abstract: Introduction: No-trauma spinal cord compressions are serious conditions not often described in children population. This study will discuss the epidemiological, clinical, biology and radiology assessment, the etiologies, the therapeutic and evolutionary aspects of this condition in children in Senegal. Patients and Methods: 113 children aged between 15 months and 18 years were managed in a 10 years period (from January 2005 to July 2015) for a non-traumatic spinal cord compression (average 8.3 years). Results: There was 66 males (58%) and 47 females (42%) with sex ratio of 1.40. The main reasons for consultation were spinal deformity (90 %). The syndrome was complete in 52 patients (46%) and incomplete in 61 patients (54%). Plain radiography performed in 63 patients. The CT scan was performed in 21 patients and myelography performed in 4 patients. MRI was performed in 22 patients. There was intradural extramedullary process (33.33%), the extradural lesions (14.28%) and intramedullary process (28.57%). Dorsal lesions were predominant (46%) followed by the lumbar spine (27%). The majority of the etiology was Pott’s disease (80%) followed by tumors (17%). Spondylitis to banal germs (2%) and parasitic spinal cord compression (1%) were rare. The histology of 6 patients was revealed 5% neurofibroma Type II, 5% extramedullary intradermal arachnoid cyst, 5% intramedullary arachnoid cyst with cytochemistry of the CSF—like content, 5% Anaplastic pilocytic astrocytoma, 5% ganglioneuroma I terminal cone and 5% meningothelial meningioma. Pott’s disease has been cured by TB chemotherapy associated with a corset in 88.89% of cases. 2 patients of this group had benefited fixation after laminectomy. 68% of the patients had a favorable recovery, and 20% had completely recovered after an average of 7 months of treatment and three (3) patients had died. The compression by bilharzias is be cured by myelotomy and praziquantel with a favorable outcome. We have 94.74% decompressive laminectomy or laminotomy with tumor resection and four (4) Patients of this group benefited fixation; the patients who had intramedullary tumor benefited myelotomy and tumor resection; 3 patients in this group had benefited fixation after laminectomy 58% of patients had good recovery and 1 pateint had died. Conclusion: In Africa, particularly in the tropics, Pott’s disease remains the first etiology followed by vertebra-medullary tumors for no traumatic spinal cord compression of child.
Application of the p-Median Problem in School Allocation  [PDF]
Fagueye Ndiaye, Babacar Mbaye Ndiaye, Idrissa Ly
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.22030
Abstract: This paper focus on solving the problem of optimizing students’ orientation. After four years spent in secondary school, pupils take exams and are assigned to the high school. The main difficulty of Education Department Inspection (EDI) of Dakar lies in the allocation of pupils in the suburbs. In this paper we propose an allocation model using the p-median problem. The model takes into account the distance of the standards imposed by international organizations between pupil’s home and school. The p-median problem is a location-allocation problem that takes into account the average (total) distance between demand points (pupil’s home) and facility (pupil’s school). The p-median problem is used to determine the best location to place a limited number of schools. The model has been enhanced and applied to a wide range of school location problems in suburbs. After collecting necessary numerical data to each EDI, a formulation is presented and computational results are carried out.
Impact of Injected Charges, Clock Noise and Operational Amplifier Imperfections on the Sample and Hold (SH) Overall Performance
Ababacar Ndiaye,Daniel Dzahini,Pape A. Ndiaye,Cheikh M. F. Kébé
Applied Physics Research , 2012, DOI: 10.5539/apr.v4n4p18
Abstract: The growing use of digital processing in analog environments underlines the importance of Analog Digital Converter (ADC) occurrence in circuitry. The quality and reliability of the conversion are closely linked to the Sample and Hold (SH) performance. Actually SH is a key component in the Analog/Digital chain. The Operational Amplifier being at the heart of the SH influences its output and subsequently impacts the reliability and quality of the conversion. In this paper we present the impact of both Operational Amplifier intrinsic characteristics and external factors such as injected charges, and clock noise on the SH overall performance. We limit our consideration to the offset and parasite capacities as the only relevant Operational Amplifier intrinsic characteristics. We’ll introduce the Operational Amplifier and SH functional characteristics then address the impact of each of these parameters on the SH output which the ADC works on. A behavioral description of the Operational Amplifier based on the Verilog-A language under Cadence approach is used. Furthermore a behavioral/analog mixed description is considered for the SH: the Operational Amplifier described behaviorally in Verilog-A is associated to analog components in Cadence libraries and CMOS switches act as SH. However this simplistic approach doesn’t reflect all the challenges involved, because it is not enough to connect a SH to ADC to flawlessly digitalize an analog signal. The SH architecture and the Operational Amplifier characteristics play also a role for a reliable sampling and therefore a good quality conversion prospect.In this study the SH performance is evaluated through its non-linearity which in turn determines the sampling accuracy a key factor for a conversion. This study is as shown that small amplitude signals are more sensible to sampling errors related to Operational Amplifier offset. Furthermore the stray capacities attenuate the SH signal output. The injected charges and the clocknoise as strongly interrelated contribute to the non-linearity of the conversion chain.
Geomagnetic Investigation Method Using Iphone® Integrated Magnetic Sensor  [PDF]
Mapathe Ndiaye, Ababacar Diagne
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.51001

We carried out a geomagnetic investigation using Iphone 4S? integrated magnetic sensor. The investigated area is a faulted sedimentary terrain crossed by basaltic volcanic veins. The obtained magnetic anomaly map shows the limits between the sedimentary rocks and a magnetic body at a given depth. These results are compared to the geometry of the magnetic body as shown by geological maps. The results seem to be accurate for the determination of geometry and the depth of the magnetic body.

Page 1 /462204
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.