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Search Results: 1 - 10 of 402634 matches for " M. Bauer "
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GET VALUABLE INFORMATION FROM THE DATA GRAVEYARD
M. Bauer
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: Continuous measurements such as temperature, pressure, or flow are recorded and stored in the plant data history of industrial chemical plants. Frequently, data is accumulated and kept in storage without anyone drawing further conclusions from it about the state of the process. This paper shows how historical data can give insight into the operation of a chemical plant. The time and frequency analysis methods are explained via an industrial process at Eastman Chemical Company, Tennessee. A procedure for systematic data analysis is given. Combined with expert knowledge of the process, causes of disturbances affecting the process can be identified. AFRIKAANSE OPSOMMING: Kontinue meting van veranderlikes soos temperatuur, druk en vloei word aangeteken en bewaar as ’n omvangryke dataversameling by ’n industri le chemiese aanleg. Heel dikwels gebeur dit dat sodanige inligting nie verder gebruik word vir die bepaling van prosestoestand nie. Díe navorsing toon hoedat sodanige inligting nuttig aangewend kan word vir die bedryf van die proses. Tyd- en frekwensieanalisemetodes word voorgehou vir ‘n nywerheidsproses by Eastman Chemical Company van Tennessee. Sistematiese data-analise word volgens prosedure uitgevoer. Deur laasgenoemde te kombineer met proseskennis kan die oorsake vir prosessteurings uitgewys word.
Ectomycorrhizal diversity at five different tree species in forests of the Taunus Mountains in Central Germany  [PDF]
Uwe Schirkonyer, Christine Bauer, Gunter M. Rothe
Open Journal of Ecology (OJE) , 2013, DOI: 10.4236/oje.2013.31009
Abstract:

Ectomycorrhizal fungi were investigated on five different forest tree species growing in pure stands on the south slope of the Taunus Mountains, which are situated at the northern end of the Rhine rift valley in Central Germany. Mycorrhizal fungi accompanying the genus Xerocomus were identified and their frequencies counted. Using ITS markers, 22 different fungal species were identified down to species level and 6 down to genus level. On European beech (Fagus sylvatica) 16 fungal species and 4 genera were identified and on Sessile oak (Quercus petraea) 16 ectomycorrhizal species and 2 genera were determined. On both deciduous trees we observed exclusively: Cortinarius subsertipes, Genea hispidula, Lactarius quietus, Tylopilus felleus and a Melanogaster genus. On Norway spruce (Picea abies) we identified 13 different mycorrhizal species and 3 different genera, on Silver fir (Abies alba) 12 species and 3 genera, and in association with European larch (Larix decidua) 11 species and 3 genera. On these conifers

Significance of venous oximetry in the critically ill
Bauer,P.; Reinhart,K.; Bauer,M.;
Medicina Intensiva , 2008,
Abstract: critically ill patients are threatened or affected by multi-organ failure (mof). tissue hypoxia is one of the most important co-factors of mof. venous oximetry allows the critical estimation of the global oxygen (o2) supply-demand ratio and can be gained from mixed (svo2) and central venous blood (scvo2). cellular requirements dominate the feedback hierarchy of the o2-metabolism. this review describes the history and validity of haemodynamic monitoring, illustrates the physiological background and clinical application of venous oxymetry and presents carbon dioxide analysis as evidence of the usefulness of a multi-modal approach in cardio-respiratory monitoring. variation of cardiac output, optimisation of arterial o2-saturation and adaptation of o2-extraction are shown to be the relevant levels of pathophysiological adaptation as well as therapeutic intervention. we portray the functional equivalence of scvo2 and svo2 and analyse their diagnostic, therapeutic and prognostic significance, providing the basis for the efficacy of venous oximetry as an important marker of critical illness. finally, having drawn an outline of current developments for the better understanding of the oxidative balance of individual organs, we stress the importance of a synoptic o2-monitoring strategy as well as the need to use its beneficial, yet unfulfilled, clinical potential.
Significance of venous oximetry in the critically ill Importancia de la oximetría venosa en el enfermo crítico
P. Bauer,K. Reinhart,M. Bauer
Medicina Intensiva , 2008,
Abstract: Critically ill patients are threatened or affected by multi-organ failure (MOF). Tissue hypoxia is one of the most important co-factors of MOF. Venous oximetry allows the critical estimation of the global oxygen (O2) supply-demand ratio and can be gained from mixed (SvO2) and central venous blood (ScvO2). Cellular requirements dominate the feedback hierarchy of the O2-metabolism. This review describes the history and validity of haemodynamic monitoring, illustrates the physiological background and clinical application of venous oxymetry and presents carbon dioxide analysis as evidence of the usefulness of a multi-modal approach in cardio-respiratory monitoring. Variation of cardiac output, optimisation of arterial O2-saturation and adaptation of O2-extraction are shown to be the relevant levels of pathophysiological adaptation as well as therapeutic intervention. We portray the functional equivalence of ScvO2 and SvO2 and analyse their diagnostic, therapeutic and prognostic significance, providing the basis for the efficacy of venous oximetry as an important marker of critical illness. Finally, having drawn an outline of current developments for the better understanding of the oxidative balance of individual organs, we stress the importance of a synoptic O2-monitoring strategy as well as the need to use its beneficial, yet unfulfilled, clinical potential. Los enfermos críticos tienen riesgo de fracaso multiorgánico (FMO) o ya lo sufren. La hipoxia tisular es uno de los cofactores más importantes de FMO. La oximetría venosa permite la estimación crítica de la ratio de aporte-demanda del oxígeno global (O2) y puede ser obtenida de la sangre venosa mixta (SvO2) y central (ScvO2). Las necesidades celulares dominan la jerarquía de retroalimentación del metabolismo de O2. Esta revisión describe la historia y validez del control hemodinámico, ilustra el fundamento fisiológico y aplicación clínica de la oximetría venosa y presenta el análisis de dióxido de carbono como prueba de la utilidad del enfoque multimodal en el control cardiorrespiratorio. Se comprueba que la variación del gasto cardiaco, la mejora de la saturación de O2 arterial y la adaptación de la extracción de O2 son los niveles importantes para la adaptación fisiopatológica y la intervención terapéutica. Presentamos el perfil de ScvO2 y SvO2 y analizamos su importancia diagnóstica, terapéutica y pronóstica, proporcionando la base para la eficacia de la oximetría venosa como un importante marcador en el enfermo crítico. Finalmente, después de presentar un esquema de los desarrollos actuales para me
Factors Affecting Intercropping and Conservation Tillage Practices in Eeastern Ethiopia
M. Ketema,S. Bauer
AGRIS on-line Papers in Economics and Informatics , 2012,
Abstract: In order to combat adverse effects of farmland degradation it is necessary for farmers to adopt sustainable land management and conservation strategies like intercropping and conservation tillage. However, efforts to adopt these strategies are very minimal in Ethiopia. In an attempt to address the objectives of examining factors affecting use of intercropping and conservation tillage practices, this study utilized plot- and household-level data collected from 211 farm households and employed a bivariate probit model for its analysis. The study revealed that intercropping and conservation tillage decisions are interdependent, and that they are also significantly affected by various factors. In addition, conservation tillage and intercropping practices as short- term interventions are found to augment the long-term interventions like terraces, diversion ditches, and tree plantations. The paper highlights important policy implications that are required to encourage intercropping and conservation tillage measures.
Treatment of Intracranial Vasospasm Following Subarachnoid Hemorrhage
Andrew M. Bauer
Frontiers in Neurology , 2014, DOI: 10.3389/fneur.2014.00072
Abstract: Vasospasm has been a long known source of delayed morbidity and mortality in aneurysmal subarachnoid hemorrhage patients. Delayed ischemic neurologic deficits associated with vasospasm may account for as high as 50% of the deaths in patients who survive the initial period after aneurysm rupture and its treatment. The diagnosis and treatment of vasospasm has still been met with some controversy. It is clear that subarachnoid hemorrhage is best cared for in tertiary care centers with modern resources and access to cerebral angiography. Ultimately, a high degree of suspicion for vasospasm must be kept during ICU care, and any signs or symptoms must be investigated and treated immediately to avoid permanent stroke and neurologic deficit. Treatment for vasospasm can occur through both ICU intervention and endovascular administration of intra-arterial vasodilators and balloon angioplasty. The best outcomes are often attained when these methods are used in conjunction. The following article reviews the literature on cerebral vasospasm and its treatment and provides the authors’ approach to treatment of these patients.
Nonlinear resonance absorption in laser-cluster interaction
M. Kundu,D. Bauer
Physics , 2005, DOI: 10.1103/PhysRevLett.96.123401
Abstract: Rare gas or metal clusters are known to absorb laser energy very efficiently. Upon cluster expansion the Mie plasma frequency may become equal to the laser frequency. This linear resonance has been well studied both experimentally and theoretically employing pump probe schemes. In this work we focus on the few-cycle regime or the early stage of the cluster dynamics where linear resonance is not met but nevertheless efficient absorption of laser energy persists. By retrieving time-dependent oscillator frequencies from particle-in-cell simulation results, we show that nonlinear resonance is the dominant mechanism behind outer ionization and energy absorption in near infrared laser-driven clusters.
Rabi Oscillations and Few-Level Approximations in Time-Dependent Density Functional Theory
M. Ruggenthaler,D. Bauer
Physics , 2009, DOI: 10.1103/PhysRevLett.102.233001
Abstract: The resonant interaction of laser light with atoms is analyzed from the time-dependent density functional theory perspective using a model Helium atom which can be solved exactly. It is found that in exact-exchange approximation the time-dependent dipole shows Rabi-type oscillations of its amplitude. However, the time-dependent density itself is not well described. These seemingly contradictory findings are analyzed. The Rabi-type oscillations are found to be essentially of classical origin. The incompatibility of time-dependent density functional theory with few-level approximations for the description of resonant dynamics is discussed.
Optimizing the ionization and energy absorption of laser-irradiated clusters
M. Kundu,D. Bauer
Physics , 2008, DOI: 10.1063/1.2896578
Abstract: It is known that rare-gas or metal clusters absorb incident laser energy very efficiently. However, due to the intricate dependencies on all the laser and cluster parameters it is difficult to predict under which circumstances ionization and energy absorption is optimal. With the help of three-dimensional particle-in-cell simulations of xenon clusters (up to 17256 atoms) we find that for a given laser pulse energy and cluster an optimum wavelength exists which corresponds to the approximate wavelength of the transient, linear Mie-resonance of the ionizing cluster at an early stage of negligible expansion. In a single ultrashort laser pulse, the linear resonance at this optimum wavelength yields much higher absorption efficiency than in the conventional, dual-pulse pump-probe set-up of linear resonance during cluster expansion.
Exactly solvable model with two conductor-insulator transitions driven by impurities
M. Bauer,O. Golinelli
Physics , 2000, DOI: 10.1103/PhysRevLett.86.2621
Abstract: We present an exact analysis of two conductor-insulator transitions in the random graph model. The average connectivity is related to the concentration of impurities. The adjacency matrix of a large random graph is used as a hopping Hamiltonian. Its spectrum has a delta peak at zero energy. Our analysis is based on an explicit expression for the height of this peak, and a detailed description of the localized eigenvectors and of their contribution to the peak. Starting from the low connectivity (high impurity density) regime, one encounters an insulator-conductor transition for average connectivity 1.421529... and a conductor-insulator transition for average connectivity 3.154985.... We explain the spectral singularity at average connectivity e=2.718281... and relate it to another enumerative problem in random graph theory, the minimal vertex cover problem.
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