1,170 research outputs found
Global Observer for Homogegeous Vector Fields
This paper presents an algebraic approach to the problem of nonlinear observer design. We show, that an observer which converges globally and asymptotically can be designed for a class of homogeneous systems of odd degree
Hydrodynamic Effects in the Symmetron and -gravity Models
In this paper we present the first results from implementing two
scalar-tensor modified gravity theories, the symmetron and the Hu-Sawicki
-gravity model, into a hydrodynamic N-body code with dark matter
particles and a baryonic ideal gas. The study is a continuation of previous
work where the symmetron and have been successfully implemented in the
RAMSES code, but for dark matter only. By running simulations, we show that the
deviation from CDM in these models for the gas density profiles are
significantly lower than the dark matter equivalents. When it comes to the
matter power-spectrum we find that hydrodynamic simulations agree very well
with dark matter only simulations as long as we consider scales larger than
h/Mpc. In general the effects of modified gravity on the baryonic
gas is found to not always mirror the effects it has on the dark matter. The
largest signature is found when considering temperature profiles. We find that
the gas temperatures in the modified gravity model studied here show
deviations, when compared to CDM, that can be a factor of a few larger
than the deviations found in density profiles and power spectra.Comment: 11 pages, 10 figures, submitted to MNRA
Study of Some Biochemical Parameters in Iraqi Children with Acute Lymphoblastic Leukemia
Leukemia or cancer of the blood is the most common childhood cancer, Acute lymphoblastic leukemia (ALL), is the most common form of leukemia that occurs in children. It is characterized by the presence of too many immature white blood cells in the childâs blood and bone marrow, Acute lymphoblastic leukemia can occur in adults too, treatment is different for children. Children with ALL develop symptoms related to infiltration of blasts in the bone marrow, lymphoid system, and extramedullary sites, such as the central nervous system (CNS). Common constitutional indications consist of fatigue (50%), pallor (25%), fever (60%), and weight loss (26%). Infiltration of blast cells in the marrow cavity and periosteum often lead to bone pain (23%) and disturbance of normal hematopoiesis. Thrombocytopenia with platelet counts less than 100,000 are seen in approximately 75% of patients. About 40% of patients with childhood ALL present with hemoglobin levels less than 7 g/dL. Although leukocyte counts greater than 50,000/mm3 occur in 20% of cases, neutropenia defined as an absolute neutrophil count less than 500 is common at presentation and is associated with an increased risk of infection. The aim of this study was to investigate the differentiations in some biochemical parameters (Hb, PCV, total serum proteins Aspartate amino transferase(AST), Alanin amino transferase (ALT), and Malondialdehyde (MDA) in blood which can be conceder as a marker of ALL. Samples were collected from 50 patients (between 1-16 years old) diagnosed with ALL after one month treatment with induction therapy, compared with 30 control samples taken from healthy persons at the same age . The ALT and MDA showed a significant increase p < 0.001 and
Circle and Popov Criterion for Output Feedback Stabilization of Uncertain Systems
In this paper, we address the problem of output feedback stabilization for a class of uncertain dynamical systems. An asymptotically stabilizing controller is proposed under the assumption that the nominal system is absolutely stable
Lâendocardite Ă Bartonella en Tunisie: ParticularitĂ©s lĂ©sionnelles et Ă©volutives
L'endocardite Ă Bartonalla est une infection ubiquitaire, son diagnostic est difficile vu qu'il s'agit souvent d'endocardite Ă hĂ©moculture nĂ©gative. Lebut de cette Ă©tude est d'analyser les particularitĂ©s lĂ©sionnelles et évolutives de cette entitĂ© dans un pays du nord d'Afrique, la Tunisie et dedĂ©montrer la gravitĂ© de cette infection. Nous avons Ă©tudiĂ©Â rĂ©trospectivement les dossiers mĂ©dicaux de 20 patients atteints d'endocardite Ă Bartonella, confirmĂ©e selon les critĂšres de Dukes modifiĂ©s. L'Ăąge moyen de nos patients Ă©tait 37 ans avec une prĂ©dominance masculine (SR=3). Tous nos malades avaient un niveau socio-Ă©conomique bas. Le motif essentiel de consultation Ă©tait la dyspnĂ©e, 6 patients Ă©taient admis dans un tableau d'insuffisance cardiaque congestive. Une prĂ©dilection des lĂ©sions au niveau de la valve aortique a Ă©tĂ© notĂ©e (14 cas). Quatorze patients avaient des vĂ©gĂ©tations endocarditiques avec une taille qui dĂ©passe 10 mm chez 8 malades. La majoritĂ© des patients (18 patients) prĂ©sentaient une rĂ©gurgitation valvulaire massive en rapport principalement avec des mutilations importantes (6 cas de ruptures de cordages mitraux, 2 cas de dĂ©chirures des sigmoĂŻdes aortiques, un cas de perforation valvulaire aortique, un cas de dĂ©sinsertion de prothĂšse mitrale). Quinze malades (3/4) avaient nĂ©cessitĂ© une chirurgie Ă la phase active de la maladie, l'indication majeure Ă©tait l'insuffisance cardiaque. Une complication neurologique Ă©tait notĂ©e chez 2 malades et une complication rĂ©nale chez 3 malades. Treize patients Ă©taient guĂ©ris, 5 malades Ă©taient dĂ©cĂ©dĂ©s et 2 malades opĂ©rĂ©s ont prĂ©sentĂ© une rĂ©infection Ă staphylococcus aureus et Ă candida albicans en postopĂ©ratoire. L'endocardite Ă Bartonella est une infection grave. Cette BactĂ©rie possĂšde un potentiel destructif important. Le recours Ă la chirurgie est quasi constant. La morbi-mortalitĂ© est Ă©levĂ©e. La recherche de cette bactĂ©rie devrait ĂȘtre alors systĂ©matique chez nos malades suspects d'endocardite d'autant plus que la bartonellose est endĂ©mique sur nos terres
Value of routine ultrasound examination at 35-37 weeks' gestation in diagnosis of fetal abnormalities
Objective: To investigate the potential value of routine ultrasound examination at 35-37 weeksâ gestation in the diagnosis of previously unknown fetal abnormalities.
Methods: This was a prospective study in 52,401 singleton pregnancies attending for a routine ultrasound examination at 35+0 - 36+6 weeksâ gestation; all pregnancies had a previous scan at 18-24 weeks and 47,215 also had a scan at 11-13 weeks. We included pregnancies resulting in livebirth or stillbirth but excluded those with known chromosomal abnormalities. The abnormalities were classified according to affected major organ system and the type and incidence of new abnormalities was determined.
Results: In the study population the incidence of fetal abnormalities was 2.2% (1,168 / 52,401), including 847 (72.5%) that had been previously diagnosed during the first and / or second trimester, 247 (21.2%) that were detected for the first time at 35-37 weeks and 74 (6.3%) that were detected for the first time postnatally. The most common abnormalities that were diagnosed during the first and / or second trimester, that were also observed at 35-37 weeks, included aberrant right subclavian artery, ventricular septal defect, talipes, unilateral renal agenesis and / or pelvic kidney, hydronephrosis, duplex kidney or unilateral multicystic kidney, cystic pulmonary airway malformation, ventriculomegaly, cleft lip and palate, polydactyly,abdominal cyst or gastroschisis. The most common abnormalities seen at 35-37 weeks were hydronephrosis, mild ventriculomegaly, ventricular septal defect, duplex kidney, ovarian cyst and arachnoid cyst. The incidence of abnormalities first seen at 35-37 weeks was 0.5% and the most common were ovarian cysts, microcephaly, achondroplasia, dacryocystocele and hematocolpos. The incidence of abnormalities first seen postnatally was 0.1% and the most common were isolated cleft palate, polydactyly or syndactyly and ambiguous genitalia or hypospadias; prenatal examination of the genitalia was not a compulsory part of the protocol.
Conclusions: A high proportion of fetal abnormalities are detected for the first time during a routine ultrasound examination at 35-37 weeksâ gestation. Such diagnosis and subsequent management, including selection of time and place for delivery and postnatal investigations, could potentially improve postnatal outcome
Acoustical and thermodynamic study of binary mixture cyclohexane-methanol using ultrasonic interferometer at different temperatures
The ultrasonic velocity (U) mass density (Ï) and shear viscosity (η) of the binary liquid mixtures of cyclohexane-methanol have been determined experimentally in the single-phase region and over the whole composition range at temperature range (T = 321.15 to 325.15 K). The experimental measurements of these properties have been carried out at atmospheric pressure, for a constant frequency 2 MHz. From these experimental data values, various acoustic and thermodynamic parameters namely adiabatic compressibility (ÎČs), acoustic impedance (Z), intermolecular free length (Lf), relaxation time (Ï), molar volume (Vm), free volume (Vf), internal pressure (Ïi), attenuation (α/f2), Gibbâs energy (ÎG), and cohesive energy (CE) have been calculated. Also their excess values have been calculated. All these parameters and their excess values have been interpreted in terms of molecular interaction such as dipole-dipole and dipole induced dipole interactions through hydrogen bonding between components of binary liquid mixture
3D MPSoC Design Using 2D EDA tools: Analysis of Parameters
International audienceDesign space exploration of 3D MPSoC architecture is reported in this paper analyzing the impact of 2D EDA tools to the 3D architecture performance. In particular, we study how 3D performance is varied when changing the EDA tools options intending to highlight design issues of 3D design. Results show that 3D timing performance is affected greatly compared with power consumption and total wirelength
Laryngectomie totale rĂ©sultats de lâexpĂ©rience du service dâorl de sfax
Introduction : La laryngectomie totale (LT) reste lâintervention la plus rĂ©alisĂ©e dans notre pays pour les cancers laryngĂ©s. Le but de ce travail est dâĂ©valuer les rĂ©sultats postopĂ©ratoires et Ă©volutifs des malades ayant eu une LT. MatĂ©riel et mĂ©thodes : Il sâagit dâune Ă©tude rĂ©trospective Ă propos de 187 cas de patients ayant eu une laryngectomie totale, sur une pĂ©riode de 19 ans (1987-2005). La tumeur a Ă©tĂ© classĂ©e T3T4 dans 87,8 % des cas. Lâatteinte des 3Ă©tages Ă©tait trouvĂ©e dans 56% des cas et lâextension extra laryngĂ©e dans 59 % des cas. Une trachĂ©otomie premiĂšre pour dyspnĂ©e laryngĂ©e a Ă©tĂ© rĂ©alisĂ©e dans 44 % des cas. La laryngectomie Ă©tait Ă©tendue au pharynx ou Ă la base de la langue dans 43 % des cas. RĂ©sultats : Les suites opĂ©ratoires ont Ă©tĂ© marquĂ©es par lâapparition d'un pharyngostome chez 19% des patients et par une infection dans 11% des cas. Les limites de rĂ©section ont Ă©tĂ© tumorales dans 14% des cas. Une radiothĂ©rapie postopĂ©ratoire a Ă©tĂ© rĂ©alisĂ©e dans 92,5% des cas.Une rĂ©Ă©ducation orthophonique a pu ĂȘtre rĂ©alisĂ©e chez 36% des patients. Sur un recul moyen de 40 mois (2 Ă 132 mois), une rĂ©cidive tumorale ou ganglionnaire a Ă©tĂ© retrouvĂ©e dans 8 % et 5 % des cas respectivement. Le taux de mĂ©tastase Ă distance Ă©tait de 11 % des cas. Une deuxiĂšme localisation a Ă©tĂ© objectivĂ©e dans 4 % des cas. La survie moyenne Ă 5 ans Ă©tait de 75 %. Discussion : La laryngectomie totale est une intervention mutilante, par le handicap vocal quâelle engendre mais la survie Ă 5 ans est de 75%. La perte dĂ©finitive de la fonction phonatoire du larynx en constitue lâhandicap majeur. Le diagnostic plus prĂ©coce de ces cancers dans notre pays peut permettre dâautres alternatives thĂ©rapeutiques.Mots-clĂ©s : Laryngectomie totale, pharyngostome, cancers laryngĂ©s
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