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Search Results: 1 - 10 of 192152 matches for " G. Weber "
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Workshopbericht: Graz als Kompetenz- und Ausbildungszentrum für Epiduroskopie
Weber G
Journal für Mineralstoffwechsel , 2006,
Período de oviposición de Gasterophilus nasalis y G. intestinalis en equinos: VIII Región, Chile
Sievers,G; Weber,B;
Archivos de medicina veterinaria , 2005, DOI: 10.4067/S0301-732X2005000200012
Abstract: the aim of this study was to determine the egg laying period of gasterophilus nasalis and to examine whether there is a relationship with the climatic conditions of the area. every two weeks, from november 2002 to march 2003, the number of eggs laid in the submaxilar region of 10 hackney horses of a farm near yumbel, in the 8th region of chile (37°, 03', s.; 72°, 33', o.), was determined. the horses were kept in a pasture without antiparasitic treatment during the study. after each egg count, a sample of eggs was removed for laboratory analysis while the remaining eggs were stained with an aqueous solution of methylene blue in order to distinguish them from those eggs laid during the following two weeks. climatic data were obtained from a meteorological station close by. g. nasalis was found to begin laying its eggs at the end of november 2002. the quantity of eggs laid in the intermandibular region of the 10 horses, peaked in mid december 2002 (853 eggs) and again in mid january 2003 (945 eggs). afterwards, the quantity of eggs laid dropped to 300 every two weeks until the beginning of april and ended completely in may 2003. the egg laying period of g. nasalis coincided with mean temperatures over 15° c. rainfall negatively influenced the egg laying of the parasite. in march and april 2003, a consistent increase in the numbers of eggs laid by g. intestinalis was detected surprisingly in the chest, shoulder joint, loin region and on the front and hind legs. more than 2000 eggs were counted in the 10 animals, confirming the presence of g. intestinalis in chile. the moment when g. intestinalis stopped laying eggs and the existence of a relationship with climatic conditions were not able to the confirmed. it was concluded that in chile, g. nasalis lays eggs from the end of november until the beginning of may, coinciding with mean temperatures over 15° c., and that g. intestinalis begins the oviposition at the beginning of march
Período de oviposición de Gasterophilus nasalis y G. intestinalis en equinos: VIII Región, Chile Egg laying period of Gasterophilus nasalis and G. intestinalis on horses: 8th Region, Chile
G Sievers,B Weber
Archivos de medicina veterinaria , 2005,
Abstract: Con el objetivo de conocer el período de oviposición de Gasterophilus nasalis y su relación con las condiciones climáticas locales se realizó, cada dos semanas, el conteo de los huevos colocados en los pelos de la región submaxilar de 10 caballos Hackney en un predio de la VIII Región, Chile, desde noviembre del 2002 a mayo del 2003 (37°, 03', S.; 72°, 33' O.). Los caballos se mantuvieron a potrero sin tratamientos antiparasitarios. Después de cada conteo se extrajeron algunos huevos para ser analizados en el laboratorio y luego se procedió a te ir los restantes con una solución de azul de metileno con el fin de poder determinar los nuevos huevos depositados en la próxima fecha de observación. G. nasalis inició la oviposición en la región intermandibular de los caballos a fines de noviembre de 2002. Las posturas máximas de 853 y 945 huevos durante dos semanas se registraron en los 10 caballos a mediados de diciembre de 2002 y a mediados de enero de 2003 respectivamente. Luego se mantuvo la postura en alrededor de 300 huevos cada dos semanas, hasta inicios de abril y concluyó en mayo de 2003. El período de oviposición coincidió con temperaturas medias superiores a los 15°C; las precipitaciones influyeron negativamente sobre la postura de huevos. A inicios de marzo de 2003 se registró sorpresivamente la oviposición de huevos de G. intestinalis en las regiones preesternal, del encuentro, costo-esternal, inguinal y los miembros de los caballos. El número de huevos aumentó en forma constante hasta mediados de abril, superando los 2000 huevos en dos semanas en los 10 caballos. Por la ubicación de la postura de los huevos y su particular morfología se confirma la presencia de G. intestinalis en Chile. No se pudo determinar el momento en que concluye su oviposición ni la relación con las condiciones climáticas. Se concluye que G. nasalis comienza la oviposición a fines de noviembre y dura hasta inicios de mayo, coincidiendo con temperaturas medias superiores a 15° C. Por otra parte, se demuestra la presencia de G. intestinalis en Chile, que comienza su oviposición a comienzos de marzo The aim of this study was to determine the egg laying period of Gasterophilus nasalis and to examine whether there is a relationship with the climatic conditions of the area. Every two weeks, from November 2002 to March 2003, the number of eggs laid in the submaxilar region of 10 Hackney horses of a farm near Yumbel, in the 8th Region of Chile (37°, 03', S.; 72°, 33', O.), was determined. The horses were kept in a pasture without antiparasitic treatment during the study. After each
Der interessante Blutdruckbefund: Pulswellenanalyse - praktische Beispiele
Eisserer G,Weber T
Journal für Hypertonie , 2008,
Integrable theories and generalized graded Maillet algebras
A. Melikyan,G. Weber
Physics , 2013, DOI: 10.1088/1751-8113/47/6/065401
Abstract: We present a general formalism to investigate the integrable properties of a large class of non-ultralocal models which in principle allows the construction of the corresponding lattice versions. Our main motivation comes from the su(1|1) subsector of the string theory on AdS_5 x S^5 in the uniform gauge, where such type of non-ultralocality appears in the resulting Alday-Arutyunov-Frolov (AAF) model. We first show how to account for the second derivative of the delta function in the Lax algebra of the AAF model by modifying Maillet's r- and s-matrices formalism, and derive a well-defined algebra of transition matrices, which allows for the lattice formulation of the theory. We illustrate our formalism on the examples of the bosonic Wadati-Konno-Ichikawa-Shimizu (WKIS) model and the two-dimensional free massive Dirac fermion model, which can be obtained by a consistent reduction of the full AAF model, and give the explicit forms of their corresponding r-matrices.
On small deviations of stationary Gaussian processes and related analytic inequalities
Michel J. G. Weber
Mathematics , 2011,
Abstract: Let $ \{X_j, j\in \Z\}$ be a Gaussian stationary sequence having a spectral function $F$ of infinite type. Then for all $n$ and $z\ge 0$,$$ \P\Big\{\sup_{j=1}^n |X_j|\le z \Big\}\le \Big(\int_{-z/\sqrt{G(f)}}^{z/\sqrt{G(f)}} e^{-x^2/2}\frac{\dd x}{\sqrt{2\pi}} \Big)^n,$$ where $ G(f)$ is the geometric mean of the Radon Nycodim derivative of the absolutely continuous part $f$ of $F$. The proof uses properties of finite Toeplitz forms. Let $ \{X(t), t\in \R\}$ be a sample continuous stationary Gaussian process with covariance function $\g(u) $. We also show that there exists an absolute constant $K$ such that for all $T>0$, $a>0$ with $T\ge \e(a)$, $$\P\Big\{\sup_{0\le s,t\le T} |X(s)-X(t)|\le a\Big\} \le \exp \Big \{-{KT \over \e(a) p(\e(a))}\Big\} ,$$ where $\e (a)= \min\big\{b>0: \d (b)\ge a\big\}$, $\d (b)=\min_{u\ge 1}\{\sqrt{2(1-\g((ub))}, u\ge 1\}$, and $ p(b) = 1+\sum_{j=2}^\infty {|2\g (jb)-\g ((j-1)b)-\g ((j+1)b)| \over 2(1-\g(b))}$. The proof is based on some decoupling inequalities arising from Brascamp-Lieb inequality. Both approaches are developed and compared on examples. Several other related results are established.
Alltagstaugliche Biometrie: Entwicklungen, Herausforderungen und Chancen
Stefan G. Weber
Computer Science , 2014,
Abstract: This article summarizes recent trends in mobile biometrics.
Absence of Differential Correlations Between the Wave Equations for Upper-Lower One-Index Twistor Fields Borne by the Infeld-van der Waerden Spinor Formalisms for General Relativity
Karla Weber,J. G. Cardoso
Physics , 2013, DOI: 10.1007/s00006-014-0456-2
Abstract: It is pointed out that the wave equations for any upper-lower one-index twistor fields which take place in the frameworks of the Infeld-van der Waerden {\gamma}{\epsilon}-formalisms must be formally the same. The only reason for the occurrence of this result seems to be directly related to the fact that the spinor translation of the traditional conformal Killing equation yields twistor equations of the same form. It thus appears that the conventional torsionless devices for keeping track in the {\gamma}-formalism of valences of spinor differential configurations turn out not to be useful for sorting out the typical patterns of the equations at issue.
The spectroscopic orbit of Capella revisited
Michael Weber,Klaus G. Strassmeier
Physics , 2011, DOI: 10.1051/0004-6361/201116885
Abstract: Context. Capella is among the few binary stars with two evolved giant components. The hotter component is a chromospherically active star within the Hertzsprung gap, while the cooler star is possibly helium-core burning. Aims. The known inclination of the orbital plane from astrometry in combination with precise radial velocities will allow very accurate masses to be determined for the individual Capella stars. This will constrain their evolutionary stage and possibly the role of the active star's magnetic field on the dynamical evolution of the binary system. Methods. We obtained a total of 438 high-resolution \'echelle spectra during the years 2007-2010 and used the measured velocities to recompute the orbital elements. Our double-lined orbital solution yields average residuals of 64 m/s for the cool component and 297 m/s for the more rapidly rotating hotter component. Results. The semi-amplitude of the cool component is smaller by 0.045 km/s than the orbit determination of Torres et al. from data taken during 1996-1999 but more precise by a factor of 5.5, while for the hotter component it is larger by 0.580 km/s and more precise by a factor of 3.6. This corresponds to masses of 2.573\pm0.009 M_sun and 2.488\pm0.008 M_sun for the cool and hot component, respectively. Their relative errors of 0.34% and 0.30% are about half of the values given in Torres et al. for a combined literature- data solution but with absolute values different by 4% and 2% for the two components, respectively. The mass ratio of the system is therefore q = M_A/M_B = 0.9673 \pm 0.0020. Conclusions. Our orbit is the most precise and also likely to be the most accurate ever obtained for Capella.
Transmission capacity of wireless networks
Steven Weber,Jeffrey G. Andrews
Mathematics , 2012,
Abstract: Transmission capacity (TC) is a performance metric for wireless networks that measures the spatial intensity of successful transmissions per unit area, subject to a constraint on the permissible outage probability (where outage occurs when the SINR at a receiver is below a threshold). This volume gives a unified treatment of the TC framework that has been developed by the authors and their collaborators over the past decade. The mathematical framework underlying the analysis (reviewed in Ch. 2) is stochastic geometry: Poisson point processes model the locations of interferers, and (stable) shot noise processes represent the aggregate interference seen at a receiver. Ch. 3 presents TC results (exact, asymptotic, and bounds) on a simple model in order to illustrate a key strength of the framework: analytical tractability yields explicit performance dependence upon key model parameters. Ch. 4 presents enhancements to this basic model --- channel fading, variable link distances, and multi-hop. Ch. 5 presents four network design case studies well-suited to TC: i) spectrum management, ii) interference cancellation, iii) signal threshold transmission scheduling, and iv) power control. Ch. 6 studies the TC when nodes have multiple antennas, which provides a contrast vs. classical results that ignore interference.
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