Search results for: P. Nagel

Items from 1 to 20 out of 33 results

article

Incidence of MRI-detected brain lesions and neurocognitive function after electrical cardioversion in anticoagulated patients with persistent atrial fibrillation

B. Bellmann, J.B. Fiebach, S. Guttmann, T. Lin, more

International Journal of Cardiology > 2017 > 243 > C > 239-243

After electrical cardioversion (eCV) in patients with atrial fibrillation (AF), the risk for clinically apparent cerebral thromboembolism is increased in the subsequent weeks. To date, there is little evidence on the incidence of acute brain lesions (ABL) detected with cerebral magnetic resonance imaging (MRI) after eCV, in particular in patients treated with the Non-Vitamin K Antagonist oral anticoagulants...

chapter

Evaluation of GRACE and ICESat Mass Change Estimates Over Antarctica

B. C. Gunter, R. E. M. Riva, T. Urban, R. Harpold, more

International Association of Geodesy Symposia > Gravity, Geoid and Earth Observation > Temporal Gravity Changes and Geodynamics > 563-569

The goal of this study is to examine some of the many corrections and processing strategies that can have a significant influence on the ice mass change estimates computed from GRACE and ICESat mission data. These two missions, when combined, have the potential to generate new insights into the mass balance and geophysical processes of regions such as Antarctica, where such quantities are currently...

chapter

Environment and the Sterile Insect Technique

P. Nagel, R. Peveling

Sterile Insect Technique > Economic, Environmental, and Management Considerations > 499-524

Summary The sterile insect technique (SIT) is an exceptionally promising pest control method in terms of efficacy and environmental compatibility. Assessments of environmental risks vary according to the status and origin of the target pests. The suppression or eradication of exotic pest populations with the SIT raises few environmental concerns, and these are related mainly to pre-release suppression...

article

Boric acid for suppression of the ant Anoplolepis tenella and effects on an associated scale insect pest Stictococcus vayssierei in cassava fields in the Congo Basin

R. Hanna, A. Fotso Kuate, S. Nanga Nanga, M. Tindo, more

Crop Protection > 2015 > 74 > Complete > 131-137

The scale insect, Stictococcus vayssierei, is one of the major pests and constraints to cassava production in the Congo Basin. It is frequently found associated with the ground nesting ant, Anoplolepis tenella, under cassava plant. Amdro fire ant bait granules (contains 7.3 g/kg Hydramethylnon), borax and boric acid solution were evaluated in the laboratory for toxicity against A. tenella colonies...

article

How plants and honeydew-producing hemipterans affect ant species richness and structure in a tropical forest zone

A. K. Fotso, R. Hanna, M. Tindo, A. Doumtsop, more

Insectes Sociaux > 2015 > 62 > 4 > 443-453

Extrafloral nectaries (EFNs) and hemipteran honeydew are often discussed as two alternative mechanisms encouraging ant visitation in mutualistic ant–plant relationships, but little is known about the processes that generate distribution pattern in species-rich insect communities. A case study on the interaction between ants, EFN-bearing plants and hemipterans was investigated along a gradient of increasing...

article

Relationship of Troponin T and Age- and Sex-Adjusted BNP Elevation Following Subarachnoid Hemorrhage with 30-Day Mortality

Katherine M. Duello, Jay P. Nagel, Colleen S. Thomas, Joseph L. Blackshear, more

Neurocritical Care > 2015 > 23 > 1 > 59-65

Background Troponin and brain natriuretic peptide (BNP) levels are predictors of mortality following subarachnoid hemorrhage (SAH). Prior studies used strict cutoffs for BNP elevation; however, normal levels of BNP are increased in older persons and women. We explored the association of troponin elevation and BNP elevation adjusted for sex and age with 30-day mortality. Methods ...

article

Rechtsventrikuläre Ausflusstrakt-Tachykardie 30 Jahre nach chirurgischer Fallot-Teratologie-Korrektur

B. Bellmann, V. Tscholl, P. Nagel, M. Roser

Herzschrittmachertherapie + Elektrophysiologie > 2015 > 26 > 3 > 303-306

Wir berichten über einen 31-jährigen Patienten mit anhaltenden Breitkomplextachykardien mit Linksschenkelblockmorphologie nach Korrektur einer Fallot-Tetralogie mit Patchplastik im linken Ausflusstrakt und Sprengung der Pulmonalklappe in der Kindheit. In der elektrophysiologischen Untersuchung mit 3D-Map konnte die Tachykardie nach Provokation mit Orciprenalin und programmierter Ventrikelstimulation...

chapter

E-SSA satellite messaging return channel: Performance analysis and field trials results

T. Heyn, P. Nagel, B. Niemann, A. Recchia, more

2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) > 1 - 6

2012 6th Advanced Satellite Multimedia Systems Conference and the 12th Signal Processing for Space Communications Workshop (ASMS/SPSC)

An open ITS platform combining interactive satellite services with other communication channels is being developed and evaluated in field trials within the SafeTRIP project [1]. Prototyping and in-field validation of a novel waveform for messaging return channel over satellite for land mobile is an important objective of the project. The overall system architecture has recently been standardized by...

article

Structure and chemical composition of mixed benzylguanine‐ and methoxy‐terminated self‐assembled monolayers for immobilization of biomolecules

M. Bruns, C. Barth, P. Brüner, S. Engin, more

Surface and Interface Analysis > 44 > 8 > 909 - 913

Covalent immobilization of biomolecules has become a subject of great interest in recent years because of the expected diversity of applications, for example, biosensors in diagnosis, lab‐on‐chip technology, and modern cell culture focused on cell adhesion, migration, and differentiation. Our approach is to produce self‐assembled monolayers (SAMs) on gold surfaces based on mixtures of a benzylguanine‐terminated...

article

Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3

P. Pal, M.K. Dalai, B.R. Sekhar, I. Ulfat, more

Physica B: Physics of Condensed Matter > 2011 > 406 > 18 > 3519-3523

The valence band electronic structure of Pr _0.5 Sr _0.5 MnO ₃ has been investigated using resonant photoemission spectroscopies across its paramagnetic metallic (PMM)–ferromagnetic metallic (FMM)–antiferromagnetic insulator (AFMI) transition. Using bulk sensitive soft X-ray photoemission, we have confirmed the presence of a gap in the near Fermi level electronic spectrum in...

article

Spectroscopic study of impurities and associated defects in nanodiamonds from Efremovka (CV3) and Orgueil (CI) meteorites

A.A. Shiryaev, A.V. Fisenko, I.I. Vlasov, L.F. Semjonova, more

Geochimica et Cosmochimica Acta > 2011 > 75 > 11 > 3155-3165

The results of spectroscopic and structural studies of phase composition and defects in nanodiamonds from Efremovka (CV3) and Orgueil (CI) chondrites indicate that nitrogen atomic environment in meteoritic nanodiamonds (MND) is similar to that observed in synthetic counterparts produced by detonation and by the Chemical Vapor Deposition (CVD)-process. Most of the nitrogen in MND appears to be confined...

article

Measurement of object height in emission electron microscopy

F. Schertz, D. Kutnyakhov, S. Schuppler, P. Nagel, more

Applied Physics A > 2011 > 102 > 2 > 253-258

The possibility of measuring the height of an object in emission electron microscopy (EEM) is investigated. If the specimen is characterized by an equipotential surface with the relief h(x,y), the image is equivalent to a specimen with an ideal flat surface and a corresponding distribution of the electric potential φ(x,y)=−E _ext h(x,y). As a consequence of the interaction with the microfields grad...

article

A business and ICT architecture for a logistics city

K.T.K. Toh, P. Nagel, R. Oakden

International Journal of Production Economics > 2009 > 122 > 1 > 216-228

The city of Melbourne, Australia, stands to benefit from achieving the logistics city status. The planning theme of a logistics city is designed around achieving efficiencies and long term sustainability out of the legacy of dispersed groups of intensive “logistics activity areas”. This is not to re-invent solutions particularly in Melbourne, where the existence of a legacy logistics infrastructure...

article

Biomass-integrated gasification fuel cell systems – Part 2: Economic analysis

Florian P. Nagel, Tilman J. Schildhauer, Nathalie McCaughey, Serge M.A. Biollaz

International Journal of Hydrogen Energy > 2009 > 34 > 16 > 6826-6844

For the seven technically feasible Biomass-Integrated Gasification Fuel Cell (B-IGFC) systems investigated in this two-part system analysis, the interactions between the used biomass gasification processes, gas processing technologies and SOFC concepts are investigated primarily employing ASPEN PLUS™ flowsheeting models. Based on the results of the system simulations, the power production costs are...

article

Biomass-integrated gasification fuel cell systems – Part 1: Definition of systems and technical analysis

Florian P. Nagel, Tilman J. Schildhauer, Serge M.A. Biollaz

International Journal of Hydrogen Energy > 2009 > 34 > 16 > 6809-6825

The combination of biomass gasification with fuel cells is commonly referred to as Biomass-Integrated gasification fuel cell systems (B-IGFC). In this two-part system analysis, we investigate seven B-IGFC systems and four solid oxide fuel cell (SOFC) designs with a system power output of around 1MW _el . In this part, we define the B-IGFC systems and asses their technical feasibility using...

article

The impact of sulfur on the performance of a solid oxide fuel cell (SOFC) system operated with hydrocarboneous fuel gas

Florian P. Nagel, Tilman J. Schildhauer, Josef Sfeir, Alexander Schuler, more

Journal of Power Sources > 2009 > 189 > 2 > 1127-1131

The impact of thiophene in the fuel gas of a commercial solid oxide fuel cell (SOFC) system is investigated for concentrations up to 400ppmV. Based on the measured voltage–current curves, an empiric correlation for the estimation of the expectable power output of the investigated SOFC system when operated with sulfur containing fuel gases is derived. An interrelation between the open circuit voltage...

article

A comparison of coincident GRACE and ICESat data over Antarctica

Brian Gunter, T. Urban, R. Riva, M. Helsen, more

Journal of Geodesy > 2009 > 83 > 11 > 1051-1060

In this study, we present a comparison of coincident GRACE and ICESat data over Antarctica. The analysis focused on the secular changes over a 4-year period spanning from 2003 to 2007, using the recently reprocessed and publicly available data sets for both missions. The results show that the two independent data sets possess strong spatial correlations, but that there are several factors that can...

article

Performance comparison of planar, tubular and Delta8 solid oxide fuel cells using a generalized finite volume model

Florian P. Nagel, Tilman J. Schildhauer, Serge M.A. Biollaz, Alexander Wokaun

Journal of Power Sources > 2008 > 184 > 1 > 143-164

A generalized, finite volume-based SOFC model is presented which includes charge, mass and heat transport as well as a Langmuir–Hinshelwood type applied kinetic model for steam reforming reactions. The model development aimed at fast applicability to various cell geometries, short calculation times to allow for system analysis calculations and high fuel flexibility. In the first part of the paper,...

article

Charge, mass and heat transfer interactions in solid oxide fuel cells operated with different fuel gases—A sensitivity analysis

Florian P. Nagel, Tilman J. Schildhauer, Serge M.A. Biollaz, Samuel Stucki

Journal of Power Sources > 2008 > 184 > 1 > 129-142

The interaction between charge, heat and mass transfer occurring in SOFCs is investigated applying a finite-volume-based SOFC model. The strong interactions are the consequence of the high degree of integration of different processes (chemical/electrochemical reactions, diffusion, heat and mass transfer) within SOFCs. The understanding of these interactions is a key for the future development and...

chapter

The National Logistics City Business and Information Systems Architecture

K.T.K. Toh, C. Sengpiehl, R. Oakden, P. Nagel, more

2008 3rd International Conference on Innovative Computing Information and Control > 233

2008 3rd International Conference on Innovative Computing Information and Control (ICICIC)

This paper describes an approach to defining the information systems architecture of the national logistics city (NLC) concept for Melbourne. Drawing from other major examples in the world, the NLC is a unifying concept and provides an opportunity for sustained economic growth. A major enabler of this concept is the information systems architecture, which is based on the Australian Government Architecture...

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INFONA - science communication portal

Search results for: P. Nagel

Incidence of MRI-detected brain lesions and neurocognitive function after electrical cardioversion in anticoagulated patients with persistent atrial fibrillation

Evaluation of GRACE and ICESat Mass Change Estimates Over Antarctica

Environment and the Sterile Insect Technique

Boric acid for suppression of the ant Anoplolepis tenella and effects on an associated scale insect pest Stictococcus vayssierei in cassava fields in the Congo Basin

How plants and honeydew-producing hemipterans affect ant species richness and structure in a tropical forest zone

Relationship of Troponin T and Age- and Sex-Adjusted BNP Elevation Following Subarachnoid Hemorrhage with 30-Day Mortality

Rechtsventrikuläre Ausflusstrakt-Tachykardie 30 Jahre nach chirurgischer Fallot-Teratologie-Korrektur

E-SSA satellite messaging return channel: Performance analysis and field trials results

Structure and chemical composition of mixed benzylguanine‐ and methoxy‐terminated self‐assembled monolayers for immobilization of biomolecules

Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3

Spectroscopic study of impurities and associated defects in nanodiamonds from Efremovka (CV3) and Orgueil (CI) meteorites

Measurement of object height in emission electron microscopy

A business and ICT architecture for a logistics city

Biomass-integrated gasification fuel cell systems – Part 2: Economic analysis

Biomass-integrated gasification fuel cell systems – Part 1: Definition of systems and technical analysis

The impact of sulfur on the performance of a solid oxide fuel cell (SOFC) system operated with hydrocarboneous fuel gas

A comparison of coincident GRACE and ICESat data over Antarctica

Performance comparison of planar, tubular and Delta8 solid oxide fuel cells using a generalized finite volume model

Charge, mass and heat transfer interactions in solid oxide fuel cells operated with different fuel gases—A sensitivity analysis

The National Logistics City Business and Information Systems Architecture

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