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Search Results: 1 - 10 of 67081 matches for " José Dorner "
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LA PERMEABILIDAD DEL AIRE Y CONDUCTIVIDAD HIDRáULICA SATURADA COMO HERRAMIENTA PARA LA CARACTERIZACIóN FUNCIONAL DE LOS POROS DEL SUELO
Dorner,José; Dec,Dorota;
Revista de la ciencia del suelo y nutrición vegetal , 2007, DOI: 10.4067/S0718-27912007000200001
Abstract: in order to describe the pore functions of ploughed soils, undisturbed soil samples were collected at two depths and orientations (vertical and horizontal) in structured soils in the weichselian moraine region in northern germany. the water retention curve, air permeability (ka) and saturated hydraulic conductivity (kf) were measured. the pore-size distribution, air-filled porosities and pore continuity indices were calculated. the tillage affects the soil quantitatively and qualitatively. the tillage-induced ploughed pan not only implies a reduction of the pore volume but also causes a direction-dependent behaviour of hydraulic properties through the development of a platy structure. in order to assess these qualitative changes, measurements like ka and/or kf are a good tool to describe the physical quality of a soil
LA PERMEABILIDAD DEL AIRE Y CONDUCTIVIDAD HIDRáULICA SATURADA COMO HERRAMIENTA PARA LA CARACTERIZACIóN FUNCIONAL DE LOS POROS DEL SUELO Air permeability and saturated hydraulic conductivity as a tool for the functional characterization of soil pores
José Dorner,Dorota Dec
Revista de la Ciencia del Suelo y Nutrición Vegetal , 2007,
Abstract: Con el objetivo de describir los aspectos funcionales de los poros de suelos labrados, se recolectaron muestras no disturbadas en dos profundidades y orientaciones (vertical y horizontal) en suelos estructurados del Norte de Alemania. Se determinó la curva de retención de agua, la permeabilidad de aire (ka) y la conductividad hidráulica en fase saturada (k f). Se calculó la distribución de poros por tama o, la porosidad de aire e índices de continuidad de poros. El manejo agrícola afecta al suelo cuantitativa y cualitativamente. La formación de un pie de arado implica no tan sólo una reducción del volumen de poros sino que también causa una dependencia espacial de las propiedades hidráulicas del suelo a través de la formación de una estructura laminar. Con el objeto de establecer dichos cambios cualitativos, mediciones como ka y k f son una buena herramienta para describir la calidad física del suelo In order to describe the pore functions of ploughed soils, undisturbed soil samples were collected at two depths and orientations (vertical and horizontal) in structured soils in the Weichselian moraine region in Northern Germany. The water retention curve, air permeability (ka) and saturated hydraulic conductivity (k f) were measured. The pore-size distribution, air-filled porosities and pore continuity indices were calculated. The tillage affects the soil quantitatively and qualitatively. The tillage-induced ploughed pan not only implies a reduction of the pore volume but also causes a direction-dependent behaviour of hydraulic properties through the development of a platy structure. In order to assess these qualitative changes, measurements like ka and/or k f are a good tool to describe the physical quality of a soil
EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
Dec,Dorota; Dorner,José; Becker-Fazekas,Orsolya; Horn,Rainer;
Revista de la ciencia del suelo y nutrición vegetal , 2008, DOI: 10.4067/S0718-27912008000100001
Abstract: in order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a luvisol. the experimental field, located in harste/goettingen, germany, was cultivated with sugar beet (beta vulgaris). the water retention curve (wrc) and saturated hydraulic conductivity (ks) were measured on undisturbed samples and homogenized samples prepared at different bulk densities (1.2 -1.4 and 1.6 mg m-3). to determine the effect of soil shrinkage on the unsaturated hydraulic conductivity (k/ψ) ,the vertical deformation of the repacked samples was measured and relative water content differences (dθ)were determined. the hydraulic properties of soils with identical texture depend on bulk density (db) and structure. the increasing bulk density not only induces changes in the pore-size distribution but also affects the ability of soil to shrink and to conduct water under unsaturated conditions. greater shrinkage was observed for samples with lower db as a consequence of reduction of coarse pores. the water content differences increase with decreasing bulk density, inducing an increasing error in the estimation of k/ψ
EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS Efecto de la densidad aparente sobre las propiedades hidráulicas de los suelos homogenizados y estructurados
Dorota Dec,José Dorner,Orsolya Becker-Fazekas,Rainer Horn
Revista de la Ciencia del Suelo y Nutrición Vegetal , 2008,
Abstract: In order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a Luvisol. The experimental field, located in Harste/Goettingen, Germany, was cultivated with sugar beet (Beta vulgaris). The water retention curve (WRC) and saturated hydraulic conductivity (Ks) were measured on undisturbed samples and homogenized samples prepared at different bulk densities (1.2 -1.4 and 1.6 Mg m-3). To determine the effect of soil shrinkage on the unsaturated hydraulic conductivity (k/Ψ) ,the vertical deformation of the repacked samples was measured and relative water content differences (dθ)were determined. The hydraulic properties of soils with identical texture depend on bulk density (dB) and structure. The increasing bulk density not only induces changes in the pore-size distribution but also affects the ability of soil to shrink and to conduct water under unsaturated conditions. Greater shrinkage was observed for samples with lower dB as a consequence of reduction of coarse pores. The water content differences increase with decreasing bulk density, inducing an increasing error in the estimation of k/Ψ Con el objetivo de determinar el efecto de la densidad aparente y estructura del suelo sobre su comportamiento hidráulico, muestras no disturbadas fueron recolectadas y muestras disturbadas fueron preparadas a partir de un Luvisol. El campo experimental, ubicado en Harste/Goettingen, Alemania, fue cultivado con remolacha (Beta vulgaris). La curva de retención de agua (WRC) y la conductividad hidráulica saturada (Ks) fue determinada en muestras no disturbadas de suelo y en muestras homogenizadas preparadas a distintas densidades aparentes (1.2 -1.4 y 1.6 Mg m-3). Para determinar el efecto de la contracción del suelo sobre la conductividad hidráulica no saturada (K/Ψ), se midió la deformación vertical de las muestras ensambladas y a partir de ello se determinó la diferencia en el contenido volumétrico de agua. Las propiedades hidráulicas de suelos con la misma textura dependen de la densidad aparente y la estructura. El incremento en la densidad aparente no sólo induce cambios en la distribución de la porosidad sino que también afecta la capacidad de contracción del suelo y de conducir agua en fase no saturada. Una mayor contracción fue observada en muestras con menor densidad aparente como consecuencia de la reducción de los poros gruesos. Las diferencias en el contenido de agua aumentan con una disminución en la densidad aparente, induciendo un mayor error en l
Public health: social context and action
Thomas E. Dorner
International Journal of Integrated Care , 2012,
Abstract:
An evaluation of New Zealand political party Websites.
Matthew Conway,Dan Dorner
Information Research: an international electronic journal , 2004,
Abstract: In a very short time, Websites have become vital campaign and communication tools for political parties around the world. This study examines the effectiveness of the Websites of New Zealand political parties, focusing on the functions that the parties were performing online and on how effectively they were delivering these functions. The research was designed to provide a quantitative evaluation of party Websites and to allow for longitudinal comparisons and comparisons between countries. Using a coding scheme that measured 50 different criteria numerically, providing for objective evaluation and comparison, the study found that New Zealand political parties were not using the Internet effectively, mainly because most were using their Websites for information provision, yet were not providing the tools required to make this information as accessible as possible. The research also found that the major parties were using their Websites more effectively than the minor and non-parliamentary parties, but the most effective Website belonged to the Green Party.
Epidemiologie der koronaren Herzkrankheit und Bedeutung für die Pr vention
Dorner T,Rieder A
Journal für Kardiologie , 2005,
Abstract:
Epidemiologische Daten zur Hypertonie
Dorner T,Rieder A
Journal für Hypertonie , 2004,
Abstract: Internationally over the last decades, there was a decline in prevalence, above all, of high-grade hypertension and a clear increase in medical therapy. The prevalence of hypertension is, however, internationally and in Austria, still high. The results of various Austrian studies are presented in the following paper. In Vorarlberg prevalence of hypertension was 16.6 % for women and 21.8 % for men. For the 50 70 year olds from Graz prevalence of hypertension was 40 %. During health examinations in Vienna in the year 2001, 12.3 % of people examined were identified as suspected hypertensives. The prevalence of hypertension amongst blue collar workers in Vienna was 29.7 % and amongst white collar workers about 20 %. Screening checks in a supermarket chain in Vienna showed 38.2 % of customers to have hypertensive blood pressure values. In a screening program in Carinthia 34.4 % reported suffering from hypertension. Self reported prevalence of hypertension in a representative Austrian survey was 7.5 % in the age group 45 49 years, and as much as 20.7 % in the over 65 age group. According to the Health Microcensus 1999, 4.9 % of Austrian men and 6.4 % of women, reported suffering from hypertension. 7 % of Austrians reported regular blood pressure measurements as an indicator in the control of high blood pressure.
Public-Health-Apekte der Hypertonie: ein Update
Dorner T,Rieder A
Journal für Hypertonie , 2009,
Abstract: Die Darstellung des Public-Health-Problems aufgrund von Hypertonie ist stark verbunden mit den Auswirkungen auf das kardiovaskul re Risiko, die kardiovaskul re Mortalit t und mit dem Einfluss auf die Lebensqualit t. In sterreich ist Hypertonie für 22,8 % aller Todesf lle und 8,9 % der DALYs (Disability adjusted life years) verantwortlich. Hypertonie ist ein modifizier- bis eliminierbarer Risikofaktor, dem durch die Implementierung einer medikament sen Therapie, die Etablierung von Lebensstiltherapie oder die Kombination von beiden entgegengewirkt werden kann. Dennoch ist das Blutdruckbewusstsein ("Awareness") in der Bev lkerung geringer ausgepr gt als die Awareness bezüglich anderer kardiovaskul rer Risikofaktoren wie Rauchen oder übergewicht. Es gibt gro e M ngel in der Blutdruckkontrolle, im Sinne des Erreichens und Aufrechterhaltens von Normalwerten. Die Kosten, die aufgrund von nicht oder schlecht behandelter Hypertonie entstehen, sind enorm. Das pr ventive Potenzial durch Blutdruckbehandlung, bei der Lebensstilma nahmen durch medikament se Ma nahmen eher unterstützt statt ersetzt werden sollen, ist sehr hoch. Ziel der Pr vention ist eine Verhinderung der hypertoniebedingten Folgeerkrankungen. Dies bedingt einen interdisziplin ren Zugang und integrierte Versorgungsmodelle, wobei die verschiedenen "Stakeholder" wie rzte und alle Health Professionals, Patienten, aber auch die Gesundheitspolitik miteinbezogen werden. Empowerment der Patienten soll durch ffentliche Bewusstseinsbildung und Information gew hrleistet werden. Durch Public-Health-Programme und eine umfassende Public-Health-Policy kann die Lebensqualit t erh ht und die Lebenserwartung in Gesundheit gesteigert werden.
Laser driven atoms in half-cavities
U. Dorner,P. Zoller
Physics , 2002, DOI: 10.1103/PhysRevA.66.023816
Abstract: The behavior of a two level atom in a half-cavity, i.e. a cavity with one mirror, is studied within the framework of a one dimensional model with respect to spontaneous decay and resonance fluorescence. The system under consideration corresponds to the setup of a recently performed experiment [J. Eschner \textit{et. al.}, Nature \textbf{413}, 495 (2001)] where the influence of a mirror on a fluorescing single atom was revealed. In the present work special attention is paid to a regime of large atom-mirror distances where intrinsic memory effects cannot be neglected anymore. This is done with the help of delay differential equations which contain, for small atom-mirror distances, the Markovian limit with effective level shifts and decay rates leading to the phenomenon of enhancement or inhibition of spontaneous decay. Several features are recovered beyond an effective Markovian treatment, appearing in experimental accessible quantities like intensity or emission spectra of the scattered light.
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