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Search Results: 1 - 10 of 875111 matches for " A.M.S. Ramasamy "
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Applications of Number Theory in Statistics
A.M.S. Ramasamy
Bonfring International Journal of Data Mining , 2012, DOI: 10.9756/bijdm.1340
Abstract: There have been several fascinating applications of Number Theory in Statistics. The purpose of this survey paper is to highlight certain important such applications. Prime numbers constitute an interesting and challenging area of research in number theory. Diophantine equations form the central part of number theory. An equation requiring integral solutions is called a Diophantine equation. In the first part of this paper, some problems related to prime numbers and the role of Diophantine equations in Design Theory is discussed. The contribution of Fibonacci and Lucas numbers to a quasi-residual Metis design is explained. A famous problem related to finite fields is the Discrete Logarithm problem. In the second part of this paper, the structure of Discrete Logarithm is discussed.
PAEDIATRIC URETERIC CALCULI: IN-SITU EXTRACORPOREAL SHOCK WAVE LITHOTRIPSY
A.M.S. SHAHIN
African Journal of Urology , 2002,
Abstract: Objective To evaluate prospectively the efficacy of in-situ extracorporeal shock wave lithotripsy (ESWL) in the treatment of ureteric calculi in the paediatric age group. Patients and Methods Twenty children (aged 2.2 16 years) with 22 ureteric stones were evaluated and treated with in-situ ESWL using the Dornier S lithotripter. The stone burden ranged from 6 14.8 mm (mean 11 mm). ESWL was performed under intravenous sedation or general anaesthesia on an outpatient basis. Results The stones were located in the upper ureter in 11 cases, in the mid ureter in 2 cases and in the lower ureter in 7 cases. At 3 months, a successful outcome (stone-free status) had been achieved in 18 cases (90%). The success rates related to the different levels of the ureter were 91%, 100% and 85.7% for the upper, mid and lower ureter, respectively. Four cases (22.2%) needed re-treatment to be stone-free. Pre-ESWL double-J stenting was required in 10% of the cases. The postoperative period was uneventful. None of the patients had post-treatment ureteral obstruction or urinary infection. Mild post-operative complications were encountered in the form of mild transient haematuria in all and colics in 8 patients. Conclusion In the paediatric age group, in-situ ESWL may be an effective modality for treating ureteric calculi at all levels of the ureter. It has no procedure-related morbidity. Calculs Urétéraux Chez lEnfant: Lithotripsie Extra-Corporelle In Situ Objectif Cette étude avait pour but lévaluation prospective de lefficacité de la lithotripsie extra-corporelle in situ dans le traitement des calculs urétéraux chez lenfant. Patients et Méthodes Vingt deux enfants agés de 2,2 à 16 ans, avec 22 calculs urétéraux, ont été traités par lithotripsie extracorporelle utilisant un lithotripteur Dornier S. La taille du calcul variait de 6 à 14,8 mm (moyenne 11 mm). La lithotripsie a été réalisée sous sédation intraveineuse ou anesthésie générale en ambulatoire. Résultats Le calcul était situé dans la portion haute de luretère dans 11 cas, dans la portion moyenne dans 2 cas et dans la partie basse dans 7 cas. A 3 mois, un succès (absence totale de calcul) a été obtenu dans 18 cas (90%). Les taux respectifs de succès selon les sièges du calcul, de haut en bas, étaient de 91%, 100% et 85,7%. Un traitement complémentaire a été nécessaire dans 4 cas (22,2%). La montée dune sonde double J avant la lithotripsie a été nécessaire dans 10% des cas. Les suites étaient simples. Il navait ni obstruction urétérale ni infection urinaire. De légères hématuries et coliques transitoires ont été observées après la lithotripsie. Conclusion Chez lenfant, la lithotripsie extra-corporelle in situ est une procédure efficace dans le traitement des calculs urétéraux quelque soit le siège. Il ny a aucune morbidité liée à la procédure. African Journal of Urology Vol.8(1) 2002: 13-19
Seroprevalence of Bovine Paratuberculosis Specific Antibodies in Khartoum and Al-Jazeera States, Sudan
K.B. Mohammed,A.M.S. El-Eragi,A.M. Zakia
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.2098.2101
Abstract: This study was conducted to estimate the bovine paratuberculosis seroprevalence in Khartoum and Al-Jazeera states, Sudan. The generated results showed that in Khartoum state the seroprevalence of paratuberculosis was 66.7% at the herd level and 10.2% at the individual animal level. The lowest seroprevalence (8%) was found at Kuku and the highest (18.8%) was found at El-Sealeat localities. All sera collected from El-Kadaro, Wad-Medani and El-Salama localities were found negative for Mycobacterium avium Subspecies Paratuberculosis (MAP) antibodies. Khartoum North showed the highest rate of seropositivity whereas Omdurman showed the lowest. Relationship between seroprevalence and clinical manifestation were described. The results of this study reported a widespread of bovine paratuberculosis in the Khartoum state.
Effect of Design and Process Parameter to Cold Forging Die Design: A Finite Element Analysis
A.B. Abdullah,M.J. Embi,A.M.S. Hamouda,S. Shuib
Journal of Applied Sciences , 2007,
Abstract: Cold forging process can be described as the process where a metal is plastically deformed at room temperature with application of huge pressure. The process not only changes the shape but also improves the properties of the forged parts due to grain size refinement. Currently the Computer Aided Engineering (CAE) tools are widely used as a replacement of the empirical trial and error method. The objective of this research is to model the cold forging process using finite element analysis. The study will investigate the stress distribution, load-displacement curve and effect of die geometry and lubrication to the die performance. Due to geometrical considerations and computational limitations, the study only involve of two-dimensional (2D) simplified model of cold forging process using ABAQUS software.
Processing and characterisation of particulate reinforced aluminium silicon matrix composite
A.M.S. Hamouda,S. Sulaiman,T.R Vijayaram,M. Sayuti
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: This paper describes and discusses the processing and characterization of quartz particulate reinforced aluminium-silicon alloy matrix composite.Design/methodology/approach: In this regard, quartz-silicon dioxide particulate reinforced LM6 alloy matrix composites were fabricated by carbon dioxide sand molding process with different particulate volume fraction. Tensile tests and scanning electron microscopic studies were conducted to determine the maximum load, tensile strength, modulus of elasticity and fracture surface analysis have been performed to characterize the morphological aspects of the test samples after tensile testing.Findings: Hardness values are measured for the quartz particulate reinforced LM6 alloy composites and it has been found that it gradually increases with increased addition of the reinforcement phase. The tensile strength of the composites decreases with the increase in addition of quartz particulate.Research limitations/implications: The results allows to determine the structure and properties of the aluminium silicon matrix composite materials.Originality/value: In addition, this research article is well featured by the particulate-matrix bonding and interface studies which have been conducted to understand the processed composite materials mechanical behavior and it was well supported by the fractographs taken using the scanning electron microscope (SEM).
Patologías espermáticas mais comuns em garanh?es da ra?a p?nei brasileira
Araújo,A.M.S.; Araújo,S.A.C.;
Archivos de Zootecnia , 2011, DOI: 10.4321/S0004-05922011000100018
Abstract: during the domestication, the man turned gradually the reproductive processes of animals, from free grazing and seasonal mating system in intensive production with the reproductive system covering the entire year. consequently, the reproductive efficiency of domestic animals declined due to environmental factors and the demands of economic production. these factors can result in partial or complete reproductive failure. the diagnosis, control and cure of reproductive disorders are essential for the modern domestic animals industry. the objective of this work was to identify and measure the most common sperm pathologies of brazilian pony stallions. the study was conducted in 3 private properties in the city of campos dos goytacazes, rio de janeiro, brazil. fifteen brazilian pony stallions, in reproductive age, and active in reproductive programs, were selected. the epididimary reserves were depleted before the experimental phase. semen samples of each stud were obtained every two weeks using an artificial vagina botucatu model and totaling 10 collections. microscopic analysis for the assessment of sperm pathologies were performed at laboratory of reprodu??o e melhoramento genético animal de monogástricos of uenf. the total number of defects found in animals of this experiment was 37.12% where, major defect reached 28.94% and minor defects 8.28%. most animals of this experiment showed an average pathology compatible with the reproduction of equine species, but sperm pathologies were above the recommended by the cbra for marketing.
DOES TUBULARIZED INCISED PLATE URETHROPLASTY FIT PRIMARY AND REPEAT SHAFT HYPOSPADIAS REPAIR?
A.M.S. SHAHIN, S. KHALIL, L. EL-BENDARY, A. ABDULATIF, T. SHAHIN
African Journal of Urology , 2002,
Abstract: Objective To evaluate prospectively our experience using tubularized incised plate (TIP) urethroplasty in primary and repeat penile shaft hypospadias. Patients and Methods Thirty-two boys with penile shaft hypospadias were selected to undergo TIP procedure. Their age ranged from 22 months to 9 years. Twenty-two cases were primary and 10 cases were repeat hypospadias repairs. To correct penile chordee, complete degloving of the penis and lateral dissection of tethering tissues was done in every case. This was followed by tunica albuginea plication in 7 cases, while ellipse excision was needed in 3 cases. Using the preserved urethral plate, single-layer urethroplasty was done in all cases. A vascularized subcutaneous flap (36 cases) or tunica vaginalis (4 cases) was always used to cover the neourethra. A postoperative stent was used for 8 12 days in all cases. Results The patients were followed up for a mean of 14.2 months. Postoperative clinical evaluation revealed success rates of 95.5% and 90% for primary and repeat cases, respectively. Among the primary cases, only one patient had urethro-cutaneous fistula concomitant with meatal stenosis, while among the repeat cases urethro-cutaneous fistula occurred in one patient. No case of urethral stricture or wound dehiscence was encountered. Our criteria for success were a single unimpeded forward-directed urine stream, a straight penis, good cosmesis and no need for further surgery. Conclusion We feel that TIP urethroplasty in primary and repeat cases of penile hypospadias is a reasonable option in cases with chordee not severe enough to necessitate excision of the urethral plate and when midline incision of the plate yields an adequate width amenable to tubularization. La Tubulisation après Incision de la Plaque Urétrale Permet-Elle la Réparation Primaire ou Itérative de LHypospadias Pénien? Objectif Evaluer de fa on prospective notre expérience de lurétroplastie par tubulisation après incision de la plaque urétrale dans la réparation primaire ou itérative de lhypospadias pénien. Patients et Méthodes Trente deux gar ons présentant un hypospadias pénien ont été sélectionnés pour bénéficier dune urétroplastie par tubulisation après incision de la plaque urétrale. Lage des patients variait de 22 mois à 9 ans. Dans 22 cas, il sagissait dune première cure et dans 10 cas dune chirurgie itérative. Le redressement de la verge a été fait dans tous les cas. La correction de la coudure résiduelle a nécessité une plicature de la tunique albuginée dans 7 cas et une excision elliptique de pastilles de lalbuginée dans 3 cas. La tubulisation de la plaque urétrale par un surjet simple a été faite dans tous les cas. Un lambeau sous-cutané vascularisé (36 cas) ou un lambeau libre de tunique vaginale a été utilisé pour recouvrir le néo-urètre. Une sonde urétrale a été laissée en place pour 8 à 10 jours dans tous les cas. Résultats Après un suivi moyen de 14,2 mois, un cas de fistule urétro-cutanée avec sténose du méat a
ROADSIDE BARRIER AND PASSIVE SAFETY OF MOTORCYCLISTS ALONG EXCLUSIVE MOTORCYCLE LANES
A.B. IBITOYE,R.S. RADIN,A.M.S. HAMOUDA
Journal of Engineering Science and Technology , 2007,
Abstract: The tremendous increase in number of motorcycles and fatalities in some ASEAN countries is becoming a main concern for the safety of motorcyclists along exclusive motorcycle lanes. The existing w-beam guardrail system along exclusive motorcycle lanes was originally designed to reduce severity of a crash when cars and trucks involve in run-off road accident – but not specifically to protect motorcyclists during such accident. However, the consequences of this guardrail design on the passive safety of motorcyclist have been given little consideration. Thus, Probability of the motorcyclists getting injured on collision with guardrail is higher compared to other motor vehicle’s driver. In order to investigate the passive safety of motorcyclists while in collision with this guardrail, this study carried out computer simulation of typical crash scenario and conducted a physical crash test to validate the simulation model. The study examines the crash mechanism as related to injury severity when motorcyclist interacts with W-beam guardrail. A three-dimensional computer simulation of a scaled Hybrid III 50th percentile Male dummy mounted on a motorcycle and colliding with W-beam guardrail was carried out. Multi-body model of motorcycle and finite element model of guardrail were developed with commercially available software called MADYMO. The simulation model is validated with a simple crash test conducted with same initial impact configuration. The subsequent simulations were set up for impacting the existing w-beam guardrail with 110 kg motorcycle using eighteen impact conditions that consist of impact angles 15o, 30o and 45o, impact speeds of 32, 48 and 60km/h as well as post spacing of 2m and 4m. The predicted rider’s injury risk criteria were used to assess safety of guardrail response to motorcyclists. The obtained results confirmed that the existing w-beam guardrail is not safe to motorcyclist, especially for the head injury at impact speed 48km/h and impact angle of 45 degree.
Resposta da cinética de consumo de oxigênio e da eficiência mecanica delta de homens e mulheres em diferentes intensidades de esfor?o
Cerqueira, Lucenildo S;Nogueira, Fernando S;Carvalho, Joyce;Pompeu, Fernando A.M.S;
Revista Brasileira de Medicina do Esporte , 2011, DOI: 10.1590/S1517-86922011000400013
Abstract: abstract introduction and objective:delta efficiency (de) and oxygen uptake kinetics (k2) are influenced by muscle metabolic parameters and oxygen transport. the aim of this study was to determine the difference in de and k2 in three effort intensities in both genders. methods: fifty-six subjects (26 women) were submitted to a graded maximal exercise test (gxt) on cycle ergometer to determine the maximum oxygen uptake ( 2max ), maximal power output (wmax), anaerobic threshold (at) and respiratory compensation point (rcp). the at and rcp were determined using the v-slope and e / 2 methods; the rcp using the relationship 2versus e both by two investigators. the de and k2 have been considered as a slope between 2versus watts and 2versus time (s), respectively, from the beginning of test until at (s1), from at to rcp (s2) and from rcp to 2max (s3), determined by linear regression analysis. results: regarding de, significant differences were observed between s1 versus s2 (p = 0.001), s1 versus s3 (p = 0.001) and s2 versus s3 (p = 0.006). there was no significant difference (p = 0.060) or interaction (p = 0.062) between men and women. for k2, significant differences were observed between s1 versus s3 (p = 0.001) and s2 versus s3 (p = 0.001) in both genders. significant differences (p = 0.001) and interaction (p = 0.006) were observed between men and women, in the last parameter. conclusions: de decreases with increasing intensity of power output, but there are no differences when comparing men and women. on the other hand, women present faster k2than men
Estabelecimento in vitro de aroeira da praia (Schinus terebinthifolius Raddi) em diferentes concentra??es de 6-benzilaminopurina (BAP)
Paiva, A.M.S.;Aloufa, M.A.I.;
Revista Brasileira de Plantas Medicinais , 2009, DOI: 10.1590/S1516-05722009000300011
Abstract: brazilian pepper (schinus terebinthifolius raddi) is anacardiaceae presenting medicinal proprieties which are extensively exploited by common citizens to treat uterine inflammation, especially in the northeast region of brazil. the aim of this study was to establish ideal concentrations of 6-benzilaminopurine (bap) for the in vitro establishment of schinus terebinthifolius using nodal, internodal, cotyledonary and apical stem segments. explants were cultured on ms medium supplemented with 3% sucrose, 0.1 g l-1 myo-inositol and distinct concentrations of bap: 0, 2.25, 4.5, 9.0 and 18.0 μm. the evaluated parameters were sprout induction, and sprout number and length. nodal segment is the most suitable explant for the in vitro establishment of brazilian pepper. internodal segments only develop callus, not inducing adventitious sprouts. the treatment with 4.5 μm bap was the most responsive to schinus terebinthifolius regeneration.
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