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Search Results: 1 - 10 of 401401 matches for " Kon M "
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Stroboscopic wave packet description of time-dependent currents through ring-shaped nanostructures
M. Kon?pka,P. Bokes
Physics , 2013, DOI: 10.1140/epjb/e2013-30770-7
Abstract: We present an implementation of a new method for explicit simulations of time-dependent electric currents through nanojunctions. The method is based on unitary propagation of stroboscopic wave packet states and is designed to treat open systems with fluctuating number of electrons while preserving full quantum coherence throughout the whole infinite system. We demonstrate the performance of the method on a model system consisting of a ring-shaped nanojunction with two semi-infinite tight-binding leads. Time-dependent electron current responses to abrupt bias turn-on or gate potential switching are computed for several ring configurations and ring-leads coupling parameters. The found current-carrying stationary states agree well with the predictions of the Landauer formula. As examples of genuinely time-dependent process we explore the presence of circulating currents in the rings in transient regimes and the effect of a time-dependent gate potential.
Agromorphological and Phenological Variabilities of 10 Bambara Groundnut [Vigna subterranea (L.) Verdc. (Fabaceae)] Landraces Cultivated in Ivory Coast
Touré, Y.,Koné, M.,Kouakou Tanoh, H.,Koné, D.
Tropicultura , 2012,
Abstract: The objective of this study was to investigate the agro-morphological and phenological characteristics of ten Bambara groundnut landraces that originated in the Ivory Coast. The study was conducted on an experimental plot at the University of Abobo-Adjame. The trial was set up according to a randomized complete block design with five replications. Twenty variables were used to identify the landraces. Landraces Ci1, Ci3, Ci10 and Ci12 exhibited high emergence percentages, early maturity within 90 DAS (days after sowing) and low vegetative/floral development. A high seed yield (388 to 495 kg/ha) was also obtained from these landraces. In contrast, a low seedling emergence rate, high vegetative development and yield (80 kg/ha) could be observed with landrace Ci9. This landrace reached maturity within 180 DAS. Landraces Ci2, Ci4, Ci5, and Ci8, on the other hand, reached maturity between 120-150 DAS. The principal component analysis conducted on the data obtained showed that the landraces with a high seed yield were early in terms of flowering and maturity, but presented low vegetative development, with limited foliage, secondary roots, leaf area and biomass. The physiological and agronomical traits presented by landraces that originated in the Ivory Coast could be exploited in Bambara groundnut varietal improvement programmes.
Multidrug- and extensively drug-resistant tuberculosis: an emerging threat
M. Berry,O.M. Kon
European Respiratory Review , 2009,
Abstract:
Potentiel infectieux des sols de cultures de tomate (Lycopersicon esculentum Mill.) sous abri et incidence de l'age de repiquage sur la vigueur des plants vis-à-vis de Pythium sp. à Songon-Dabou en C te d'Ivoire
Soro, S.,Doumbouya, M.,Koné, D.
Tropicultura , 2008,
Abstract: Potentiel Infectious of Soils Fields of Tomato (Lycopersicon esculentum Mill.) in Greenhouse and the Age Incidence Facing Pythium sp. on the Plants at Songon-Dabou in Ivory Coast. Songon-Dabou area represents one of the spheres activities of tomato in Ivory Coast. The production of tomato is strongly influenced by some of viruses, bacteria and soil born fungi. A study was conducted on the soils of different fields with three varieties of tomato (Cara bo, Mongal and Tropimech) to identify the most susceptible variety to soil born fungi at Songon-Dabou. By baiting with 20 days old seedlings, 4 genus fungi of Pythium, Fusarium, Sclerotium and Macrophomina have been isolated. Pythium sp. presented the greatest attack (32%) while Macrophomina phaseoli was isolated for the first time on market gardening in Ivory Coast. Tomato plants have been inoculated by Pythium at different stages obtained from seedling to 25 days old nursery seedlings. That experiment was repeated three times. This work was conducted in greenhouse during 26 days after transplantation of the plants in the pots. These results confirm that Pythium sp. is a fungus of damping off (100%) and that age of transplantation reduces the rate of mortality (less than 20%).
A Generalized Approach to Optimization of Relational Data Warehouses Using Hybrid Greedy and Genetic Algorithms
G. Velinov,M. Kon Popovska,D. Gligoroski
Scientific Annals of Computer Science , 2009,
Abstract: As far as we know, in the open scientific literature, there is no generalizedframework for the optimization of relational data warehouseswhich includes view and index selection and vertical view fragmentation.In this paper we are offering such a framework. We proposea formalized multidimensional model, based on relational schemas,which provides complete vertical view fragmentation and presents anapproach of the transformation of a fragmented snowflake schema toa defragmented star schema through the process of denormalization.We define the generalized system of relational data warehouses optimizationby including vertical fragmentation of the implementationschema (F), indexes (I) and view selection (S) for materialization. Weconsider Genetic Algorithm as an optimization method and introducethe technique of ”recessive bits” for handling the infeasible solutionsthat are obtained by a Genetic Algorithm. We also present two novelhybrid algorithms, i.e. they are combination of Greedy and GeneticAlgorithms.Finally, we present our experimental results and show improvementsof the performance and benefits of the generalized approach(SFI) and show that our novel algorithms significantly improve theefficiency of the optimization process for different input parameters.
Description du système racinaire de trois espèces fourragères en zone soudano-sahélienne : Andropogon gayanus, Vigna unguiculata et Stylosanthes hamata
Groot JJR.,Traoré M.,Koné D.
Biotechnologie, Agronomie, Société et Environnement , 1998,
Abstract: Description of root systems of three fodder crops in the Soudano-Sahelian area: Andropogon gayanus, Vigna unguiculata and Stylosanthes hamata. Root systems of fodder crops (Andropogon gayanus, Vigna unguiculata and Stylosanthes hamata) were studied at two Research Stations in Mali in 1992, using soil monoliths. In this method, roots are studied throughout the soil profile in cubical compartments of 1 dm3. Root biomass production of A. gayanus planted in 1951 was 4 t.ha-1 against 5 t.ha-1 when planted in 1991. Above-ground biomass was 12 and 8 t.ha-1, respectively. The majority (90%) of the root biomass was concentrated in the upper 60 cm of the soil profile even if the root depth reached 180 cm. Root biomass decreased with depth following a negative exponential curve, but root length density decreased to a lesser extent, resulting in increasing specific root length (root length per unit of root biomass) with depth. Root biomass of V. unguiculata was 1,118 kg.ha-1 without phosphorus fertilization and 2,922 kg.ha-1 with Pfertilization. The effect of Pon above ground biomass was negligible, and no reduction of specific root length with depth was observed. Root biomass production by S. hamata hardly responded to P fertilization: 3,596 kg.ha-1 without P and 4,161 kg.ha-1 with non-limiting P-supply; above-ground biomass was 8,360 and 10,680 kg.ha-1 respectively. Root length density was relatively high for the whole root profile and specific root length increased from 35 m.g-1 for the 0–20 cm layer to 100 m.g-1 for the 130–140 cm layer, allowing S. hamata to use water and nutrients efficiently throughout the whole profile.
Quantum chaos and fractals with atoms in cavities
M. Uleysky,L. Kon'kov,S. Prants
Physics , 2002, DOI: 10.1016/S1007-5704(03)00043-1
Abstract: We study the coupled translational, electronic, and field dynamics of the combined system "a two-level atom + a single-mode quantized field + a standing-wave ideal cavity". We derive Hamilton -- Schr\"odinger equations for probability amplitudes and averaged position and momentum of a point-like atom interacting with the quantized field in a standing-wave cavity. They constitute, in general, an infinite-dimensional set of equations with an infinite number of integrals of motion which may be reduced to a dynamical system with four degrees of freedom if the quantized field is supposed to be initially prepared in a Fock state. This system is found to produce semiquantum chaos with positive values of the maximal Lyapunov exponent. At large values of detuning $|\delta|\gg 1$, the Rabi atomic oscillations are usually shallow, and the dynamics is found to be almost regular. The Doppler -- Rabi resonance, deep Rabi oscillations that may occur at any large value of $|\delta|$ to be equal to $|\alpha p_0|$, is found numerically and described analytically (with $\alpha$ to be the normalized recoil frequency and $p_0$ the initial atomic momentum). Two gedanken experiments are proposed to detect manifestations of semiquantum chaos in real experiments. In the chaotic regime values of the population inversion $z_{out}$, measured with atoms after transversing a cavity, are so sensitive to small changes in the initial inversion $z_{in}$ that the probability of detecting any value of $z_{out}$ in the admissible interval becomes almost unity in a short time. Chaotic wandering of a two-level atom in a quantized Fock field is shown to be fractal. Fractal-like structures, typical for chaotic scattering, are numerically found in the dependence of the time of exit of atoms from the cavity on their initial momenta.
Tuberculosis of the Sternoclavicular Joint: Report of 3 New Cases Observed in Abidjan  [PDF]
Mohamed Diomandé, Mariam Gbané-Koné, Baly Ouattara, Tamo Estelle Mégné, Edmond Eti, Marcel N’zué Kouakou
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2015, DOI: 10.4236/ojra.2015.51001
Abstract: The sternoclavicular joint is a rare site of osteoarticular tuberculosis. We now report three new cases of sternoclavicular tuberculosis. The report concentrates mostly on immunocompromised patients, notably two with HIV infection and one case marked by its acute onset which is rather original because, in this case, there was a swollen sternoclavicular joint with normal X-ray and it was the CT-scan which showed the lesions. The etiological diagnosis was made in the first case by polymerase chain reaction and in the second case by identification of Mycobacterium tuberculosis. In the third case, the diagnosis was presumptive and the outcome on anti-tuberculous drugs was satisfactory. Sternoclavicular joint tuberculosis is unusual; the painful swelling of that joint should lead to realize a performed imaging such as CT-scan.
Hypofractionated Radiation Therapy for the Treatment of Breast Cancer: Experience of National Institute of Oncology, Rabat, Morocco  [PDF]
A. S. Koné, A. Diakité, S. Ahid, I. M. Diarra, K. Diabaté, R. Abouqal, Y. Cherrah, N. Benjaafar
Journal of Cancer Therapy (JCT) , 2016, DOI: 10.4236/jct.2016.710078
Abstract: Hypofractionated radiation therapy has proven effective on locoregional control and tolerance in the adjuvant treatment of breast cancer. The aim of this study is to compare the results of hypofractionated radiation therapy versus conventional radiation therapy in terms of local control and tolerance. It was a retrospective study of patients observations collected from January 2007 to December 2008 in Department of Radiation Therapy in Institut National d’Oncologie de Rabat. The treatment results were evaluated by the rate of locoregional recurrence, distant recurrence and research of late toxicities. Radiotherapy was delivered using the same technique in both groups, by gamma photons of cobalt 60 with an energy of 1.25 MeV. They were 2 groups: the first group treated with standard dose rate and the second group treated by hypofractionated radiation therapy. The mean age of the patients was 42.8 ± 6.9 years old in the standard group and 43.22 ± 7.2 years old in the hypofractionation group. We noted a predominance of infiltrating ductal carcinoma. The majority of patients were pT
Epidemiological and Clinical Profile of Cervix Cancer at Bamako Radiotherapy Center  [PDF]
A. Diakité, A. S. Koné, Y. L. Diallo, K. Diabaté, I. M. Diarra, M. Ndiaye, M. A. Camara, M. M. Traoré, A. Traoré, F. M. Sidibé, S. Sidibé
Open Journal of Obstetrics and Gynecology (OJOG) , 2019, DOI: 10.4236/ojog.2019.91010
Abstract:
Cervical cancer remains a major public health problem in Africa, particularly in Mali. The goal of this work was to investigate the epidemiological and clinical aspects of cervix cancer seen at the radiation therapy center. This was a descriptive study on the retrospective collection of data on patients found in the Radiation Therapy Centre of Bamako, for invasive cervical cancer be-tween April 2014 and April 2017. The average age of our population was 52 ± 12.5 years with extremes ranges from 18 to 95 years. The most represented age group was [50 - 65 years] with 44.2%. The predominant histological type was squamous carcinoma (CE) with 94.2%. Bleeding were found in almost all patients, most often associated with foul smelling hydrorrhea; 80.3% of our patients were stage III and 12.9% of stage IV according to the IFGO classifi-cation. Cervix cancer remains a major public health problem in Mali. The di-agnosis is often late, therefore, resulting in late care and unfavorable progno-sis. Sensitization, vulgarization of vaccination and systematization of screen-ing could be helpful in the fight against this cancer.
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