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Search Results: 1 - 10 of 55740 matches for " Y. Olivier "
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The evaluation of hydrogen peroxide bleaching of Gonometa postica silk
HJ Steyn, Y Olivier
Journal of Family Ecology and Consumer Sciences /Tydskrif vir Gesinsekologie en Verbruikerswetenskappe , 2010,
Abstract: The effect of hydrogen peroxide bleaching on Gonometa postica silk and the influence that temperature, pH and time duration had on hydrogen peroxide release , colour change, breaking load and stiffness were determined. The best bleaching (81 delta E) of the Gonometa postica silk fabric was obtained with 60 minutes exposure to hydrogen peroxide at 90°C and pH 8. Bleaching lowered the strength of the Gonometa postica silk fabric 7, 6% at pH10 but 12, 8% at pH 8. Rigidity of Gonometa postica silk fabric increased as a result of bleaching at 60°C, 70°C and 90°C at pH 8 and pH 10. The bending length was the highest (5.28 cm) after bleaching at 90°C and pH 8. Although acceptable bleaching of Gonometa postica silk fabric is reached with 60 minute exposure to hydrogen peroxide at 90°C and pH 8 or 180 minutes at 70°C at pH 8, bleaching cannot be recommended because the fabric becomes too rigid and requires a lower load to break. Gonometa postica silk fabric should be used in its natural colour or dyed in darker colours until a bleaching practice that would not cause the fabric to be harsh and stiff is developed.
USING THE POPULATION-BASED INCREMENTAL LEARNING ALGORITHM WITH COMPUTER SIMULATION: SOME APPLICATIONS
J. Bekker,Y. Olivier
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: The integration of the population-based incremental learning (PBIL) algorithm with computer simulation shows how this particular combination can be applied to find good solutions to combinatorial optimisation problems. Two illustrative examples are used: the classical inventory problem of finding a reorder point and reorder quantity that minimises costs while achieving a required service level (a stochastic problem); and the signal timing of a complex traffic intersection. Any traffic control system must be designed to minimise the duration of interruptions at intersections while maximising traffic throughput. The duration of the phases of traffic lights is of primary importance in this regard. AFRIKAANSE OPSOMMING: Die integrasie van die population-based incremental learning (PBIL) algoritme met rekenaarsimulasie word bespreek, en daar word getoon hoe hierdie spesifieke kombinasie aangewend kan word om goeie oplossings vir kombinatoriese optimeringsprobleme te vind. Twee voorbeelde dien as illustrasie: die klassieke voorraadprobleem waarin ’n herbestelvlak en herbestelhoeveelheid bepaal moet word om koste te minimeer maar nogtans ’n vasgestelde diensvlak te handhaaf (’n stochastiese probleem); en die bepaling van die seintye van ’n komplekse verkeerskruising. Enige verkeerbeheerstelsel moet ontwerp word om die duur van die vloeionderbrekings by verkeerskruisings te minimeer en verkeerdeurset te maksimeer. Die tydsduur van die fases van verkeersligte is dus baie belangrik.
Black Carbon Instead of Particle Mass Concentration as an Indicator for the Traffic Related Particles in the Brussels Capital Region  [PDF]
Peter Vanderstraeten, Michael Forton, Olivier Brasseur, Zvi Y. Offer
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.25060
Abstract: The Brussels Capital Region has difficulties in meeting the stringent EU daily limit value for PM10 in all its measuring sites. Postponing the attainment of the deadline was not granted by the EU Commission, mainly due to insufficient judged measures to reduce road traffic emissions. However, a thorough analysis of the data makes clear that neither the particle mass concentration (PM10 and PM2.5) nor the particle number concentration are specific metrics for evaluating the particle pollution originated by traffic. In fact, increased formation of secondary aerosol, together with adverse meteorological conditions and the (re) suspension of the coarser fraction are by far the three main explanations for the numerous PM10 exceeding values. From our experience, amongst the particles measured, only the results for Black Carbon (BC), mainly present in the lower submicron range, are reflective of the direct influence of local traffic. Measured at two traffic sites along with PM mass and number concentrations, the data for Black Carbon show a striking correlation with nitrogen monoxide, a parameter strongly related with the proximity of the local traffic. The correlation factor between Black Carbon data and NO or NOX is much higher than between Black Carbon and the PM mass or number concentration. Therefore the assessment of traffic related particles should consider Black Carbon rather than PM10 or PM2.5.
Bone Metastases: Experience of Rheumatology Unit of National Hospital University Hubert Koutoukou Maga of Cotonou  [PDF]
Zavier Zomalheto, Olivier Biaou, Patricia Yékpè-Ahouansou, Sèdami Narcès Emery Gnankadja, Martin Avimadje
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2015, DOI: 10.4236/ojra.2015.51002
Abstract: Aim: To determine the epidemiological, diagnosis and treatment of secondary bone cancer at the National Hospital University Hubert Koutoukou Maga of Cotonou. Patients and Method: It was a retrospective descriptive cross-sectional study carried out from January 1999 to December 2013 on the records of patients treated in the rheumatology department. The selected files had radiological images of tumor appearance objectified by two radiologists. The diagnosis of secondary bone cancer was confirmed after a bone biopsy or the discovery of a primitive tumor site. Patients with hematologic malignancy and incomplete or insufficiently explored records were excluded. Results: Among 10,292 patients followed in the service, 51 (0.5%) had documented bone metastasis. The sex ratio was 1.83. The mean age of patients was 54 ± 9 [26-85] years, with 53% of those over 60 years old. Secondary cancers were on the spine (74.5%), pelvis (35.3%) and the long bones (39.2%). The primary cancer most frequently found was that of the prostate and breast (45.1% and 27.6%, respectively) followed by genital and digestive cancers (9.8% and 7.8%, respectively). Treatment was dominated by hormone therapy (83%) bisphosphonates (70.5%) and chemotherapy (57%). Conclusion: The profile of bone cancer in Benin hospital is very diverse and dominated by the types and osteolytic ostéocondensant. Primary cancers were dominated by the prostate and breast. Bisphosphonates took an important place in the treatment of the disease.
Bone Metastases: Experience of Rheumatology Unit of National Hospital University Hubert Koutoukou Maga of Cotonou  [PDF]
Zavier Zomalheto, Olivier Biaou, Patricia Yékpè-Ahouansou, Sèdami Narcès Emery Gnankadja, Martin Avimadje
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2015, DOI: 10.4236/ojra.2015.51002
Abstract: Aim: To determine the epidemiological, diagnosis and treatment of secondary bone cancer at the National Hospital University Hubert Koutoukou Maga of Cotonou. Patients and Method: It was a retrospective descriptive cross-sectional study carried out from January 1999 to December 2013 on the records of patients treated in the rheumatology department. The selected files had radiological images of tumor appearance objectified by two radiologists. The diagnosis of secondary bone cancer was confirmed after a bone biopsy or the discovery of a primitive tumor site. Patients with hematologic malignancy and incomplete or insufficiently explored records were excluded. Results: Among 10,292 patients followed in the service, 51 (0.5%) had documented bone metastasis. The sex ratio was 1.83. The mean age of patients was 54 ± 9 [26-85] years, with 53% of those over 60 years old. Secondary cancers were on the spine (74.5%), pelvis (35.3%) and the long bones (39.2%). The primary cancer most frequently found was that of the prostate and breast (45.1% and 27.6%, respectively) followed by genital and digestive cancers (9.8% and 7.8%, respectively). Treatment was dominated by hormone therapy (83%) bisphosphonates (70.5%) and chemotherapy (57%). Conclusion: The profile of bone cancer in Benin hospital is very diverse and dominated by the types and osteolytic ostéocondensant. Primary cancers were dominated by the prostate and breast. Bisphosphonates took an important place in the treatment of the disease.
Nonlinear Control of an Induction Motor Using a Reduced-Order Extended Sliding Mode Observer for Rotor Flux and Speed Sensorless Estimation  [PDF]
Olivier Asseu, Michel Abaka Kouacou, Theophile Roch Ori, Zié Yéo, Malandon Koffi, Xuefang Lin-Shi
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.210104
Abstract: This article proposes an innovative strategy to the problem of non-linear estimation of states for electrical machine systems. This method allows the estimation of variables that are difficult to access or that are simply impossible to measure. Thus, as compared with a full-order sliding mode observer, in order to reduce the execution time of the estimation, a reduced-order discrete-time Extended sliding mode observer is proposed for on-line estimation of rotor flux, speed and rotor resistance in an induction motor using a robust feedback linearization control. Simulations results on Matlab-Simulink environment for a 1.8 kW induction motor are presented to prove the effectiveness and high robustness of the proposed nonlinear control and observer against modeling uncertainty and measurement noise.
Ultrasound Contribution to the Diagnosis of Emphysematous Cystitis  [PDF]
Kofi-Mensa Savi de Tové, Madina Napon, Zakari Nikiema, Patricia Yèkpè, Olivier Biaou, Vicentia Boco
Open Journal of Radiology (OJRad) , 2015, DOI: 10.4236/ojrad.2015.53024
Abstract: Emphysematous cystitis is a severe urinary tract infection which threatens patients’ life. Thus, it requires early diagnosis and computed tomography (CT) is the reference medical exam used to address it. However, ultrasound, which is a non-ionizing and very accessible technique, may also contribute to diagnosis. The aim of this study was to illustrate the contribution of ultrasound to the diagnosis of emphysematous cystitis. We report three cases of emphysematous cystitis diagnosed by ultrasound. In all the cases, ultrasound identified basic signs showing presence of gas, including a hyperechoic cystic parietal thickening, repeat echoes and dirty shadow cones of intraluminal focus. Diagnostic confirmation was made in two cases through X-ray and in one case by means of computed tomography. Through simple basic signs, ultrasound directs most usefully towards an emphysematous urinary tract infection. CT enables a more accurate diagnostic work-up of lesions and differential diagnosis with vesico-digestive fistula.
Pd-catalysed [3 + 3] annelations in the stereoselective synthesis of indolizidines
Provoost Olivier Y,Hazelwood Andrew J,Harrity Joseph PA
Beilstein Journal of Organic Chemistry , 2007, DOI: 10.1186/1860-5397-3-8
Abstract: A [3 + 3] annelation of enantiomerically pure aziridine 7 provides the functionalised piperidine 8 that can be elaborated to the indolizidine skeleton in only 4 steps with good stereocontrol.
And If Bell’s Inequality Were Not Violated  [PDF]
Olivier Serret
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.514137
Abstract:

It briefly recalls the theory of Bell’s inequality and some experimental measures. Then measurements are processed on one hand according to a property of the wave function, on the other hand according to the sum definition. The results of such processed measures are apparently not the same, so Bell’s inequality would not be violated. It is a use of the wave function which implies the violation of the inequality, as it can be seen on the last flowcharts.

Thermodynamics and Irreversibility: From Some Paradoxes to the Efficiency of Effective Engines  [PDF]
Olivier Serret
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.516159
Abstract: The traditional thermodynamic theory explains the reversible phenomena quite well, except that reversible phenomena are rare or even impossible in practice. Here the purpose is to propose an explanation valid for reversible and also irreversible phenomena, irreversibility being common or realistic. It previously exposed points tricky to grasp, as the sign of the work exchange, the adiabatic expansion in vacuum (free expansion) or the transfer of heat between two bodies at the same temperature (isothermal transfer). After having slightly modified the concepts of heat transfer (each body produces heat according to its own temperature) and work (distinguishing external pressure from internal pressure), the previous points are more easily explained. At last, an engine efficiency in case of irreversible transfer is proposed. This paper is focused on the form of thermodynamics, on “explanations”; it does not question on “results” (except the irreversible free expansion of 1845...) which remain unchanged.
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