S. Krause - Academia.edu (original) (raw)

Papers by S. Krause

Research paper thumbnail of Correlations of Structural, Chemical and Electronic State on La0. 8Sr0. 2MnO3 Dense Thin-Film Surfaces

ABSTRACT Perovskite-type mixed ionic-electronic conductor oxides are used as Solid Oxide Fuel Cel... more ABSTRACT Perovskite-type mixed ionic-electronic conductor oxides are used as Solid Oxide Fuel Cell cathodes (SOFC). A major limitation in cathode performance is the slow kinetics of oxygen exchange on the perovskite oxide surfaces, particularly at lower temperatures (T

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Research paper thumbnail of Enhanced membrane bioreactor process without chemical cleaning

Water Science & Technology, 2010

In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and tr... more In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and treated water takes place by membrane filtration. Due to the small footprint and superior effluent quality, the number of membrane bioreactors used in wastewater treatment is rapidly increasing. A major challenge in this process is the fouling of the membranes which results in permeability decrease and the demand of chemical cleaning procedures. With the objective of a chemical-free process, the removal of the fouling layer by continuous physical abrasion was investigated. Therefore, particles (granules) were added to the activated sludge in order to realise a continuous abrasion of the fouling layer. During operation for more than 8 months, the membranes showed no decrease in permeability. Fluxes up to 40 L/(m(2) h) were achieved. An online turbidity measurement was installed for the effluent control and showed no change during this test period. For comparison, a reference (standard MBR process without granules) was operated which demonstrated permeability loss at lower fluxes and required chemical cleaning. Altogether with this process an operation at higher fluxes and no use of cleaning chemicals will increase the cost efficiency of the MBR-process.

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Research paper thumbnail of Understanding process dynamics at aquifer-surface water interfaces: An introduction to the special section on new modeling approaches and novel experimental technologies

Water Resources Research, 2014

ABSTRACT This paper introduces the special section on “New Modelling Approaches and Novel Experim... more ABSTRACT This paper introduces the special section on “New Modelling Approaches and Novel Experimental Technologies for Improved Understanding of Process Dynamics at Aquifer-Surface Water Interfaces”. It is contextualising the framework for the 27 research papers of the special section by firth identifying research gaps and imminent challenges for ecohydrological research at aquifer-surface water interfaces and then discussing the specific paper contributions on (i) New Developments in Temperature/Heat Tracing at GW-SW Interfaces, (ii) New methods to capture the temporal and spatial variability of groundwater – surface water exchange (iii) New Approaches in Modelling Aquifer-River Exchange Flow and (iv) New Concepts and Advanced Theory of Groundwater – Surface Water Exchange.

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Research paper thumbnail of Effect of mechanical cleaning with granular material on the permeability of submerged membranes in the MBR process

Water Research, 2010

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Research paper thumbnail of Current-Driven Spin Dynamics of Artificially Constructed Quantum Magnets

Science, 2013

The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic... more The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic control of atomic-scale magnets. The role of the substrate conduction electrons on the dynamics of supported atomic magnets is still a question of interest lacking experimental insight. We characterized the temperature-dependent dynamical response of artificially constructed magnets, composed of a few exchange-coupled atomic spins adsorbed on a metallic substrate, to spin-polarized currents driven and read out by a magnetic scanning tunneling microscope tip. The dynamics, reflected by two-state spin noise, is quantified by a model that considers the interplay between quantum tunneling and sequential spin transitions driven by electron spin-flip processes and accounts for an observed spin-transfer torque effect.

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Research paper thumbnail of New retroviral vectors for tight regulated gene expression in hepatoma and embryonal liver cells

Journal of Hepatology, 2001

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Research paper thumbnail of The role of individuality in collective group movement

Proceedings of the Royal Society B: Biological Sciences, 2012

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Research paper thumbnail of 699 Long-term clinical outcomes of laboratory-based cocaine administration in individuals with cocaine dependence

Drug and Alcohol Dependence, 2000

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Research paper thumbnail of Accurate decisions in an uncertain world: collective cognition increases true positives while decreasing false positives

Proceedings of the Royal Society B: Biological Sciences, 2013

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Research paper thumbnail of Clinical outcomes following cocaine infusion in nontreatment-seeking individuals with cocaine dependence

Biological Psychiatry, 2001

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Research paper thumbnail of Temperature-dependent scanning tunneling spectroscopy on the Si(557)-Au surface

Physical Review B, 2014

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Research paper thumbnail of Strongly Reduced Number of Parvalbumin-Immunoreactive Projection Neurons in the Mammillary Bodies in Schizophrenia: Further Evidence for Limbic Neuropathology

Annals of the New York Academy of Sciences, 2007

The mammillary bodies (MB) are important relay nuclei within limbic and extralimbic connections. ... more The mammillary bodies (MB) are important relay nuclei within limbic and extralimbic connections. They are known to play important roles in memory formation and are affected in alcoholism and vitamin B1 deficiency. Their strategic position linking temporo-limbic to cortico-thalamic brain structures make the MB a candidate brain structure for alterations in schizophrenia. We studied 15 postmortem brains of schizophrenics and 15 matched control brains. Brain sections were stained either with Heidenhain-Woelcke, glutamic acid decarboxylase (GAD), calretinin, or parvalbumin. We determined the volumes of the MB and performed cell countings using stereological principles and a computerized image analysis system. The volumes of MB do not differ between schizophrenics and controls. However, in schizophrenia the number of neurons as well as the resulting neuronal densities was significantly reduced on both sides (on left side by 38.9%, on right side by 22%). No changes were seen in the number of GAD-expressing or calretinin-containing neurons, whereas the number of parvalbumin-immunoreactive MB neurons was reduced by more than 50% in schizophrenia. This cell loss (as a result of developmental malformation and/or neurodegeneration) points to a prominent involvement of the MB in the pathomorphology of schizophrenia. Parvalbumin-immunoreactive GABAergic interneurons have been reported to be diminished in schizophrenia. However, in the MB parvalbumin labels a subpopulation of glutamate/aspartate-containing neurons projecting mainly to the anterior thalamus. Thus, our data provide new evidence for impaired limbic circuits in schizophrenia.

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Research paper thumbnail of JChemPaint - Using the Collaborative Forces of the Internet to Develop a Free Editor for 2D Chemical Structures

Molecules, 2000

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Research paper thumbnail of Which senses play a role in nonhuman primate food selection? A comparison between squirrel monkeys and spider monkeys

American Journal of Primatology, 2007

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Research paper thumbnail of Assortative interactions and leadership in a free-ranging population of juvenile lemon shark Negaprion brevirostris

Marine Ecology Progress Series, 2011

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Research paper thumbnail of Institutions, arrangements and preferences for inflation stability: Evidence and lessons from a panel data analysis

Journal of Macroeconomics, 2008

We study how monetary, exchange-rate and other institutional arrangements are associated with pol... more We study how monetary, exchange-rate and other institutional arrangements are associated with policy makers’ preferences for inflation stability. We argue that focusing on policy intentions, represented by these preferences, constitutes a better way of evaluating policy behavior, instead of looking at inflation outcomes that may be unavoidable at times.Using a panel of 34 countries over a period of 24years we

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Research paper thumbnail of Two dimensional band structure mapping of organic single crystals using the new generation electron energy analyzer ARTOF

Journal of Electron Spectroscopy and Related Phenomena, 2012

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Research paper thumbnail of Spatio-temporal variations of hyporheic flow in a riffle-step-pool sequence

Hydrological Processes, 2009

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Research paper thumbnail of Leadership in fish shoals

Fish and Fisheries, 2000

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Research paper thumbnail of Hsp70-peptide activated autologous NK cells in the immunotherpay of cancer — a clinical pilot study

European Journal of Cancer, 2001

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Research paper thumbnail of Correlations of Structural, Chemical and Electronic State on La0. 8Sr0. 2MnO3 Dense Thin-Film Surfaces

ABSTRACT Perovskite-type mixed ionic-electronic conductor oxides are used as Solid Oxide Fuel Cel... more ABSTRACT Perovskite-type mixed ionic-electronic conductor oxides are used as Solid Oxide Fuel Cell cathodes (SOFC). A major limitation in cathode performance is the slow kinetics of oxygen exchange on the perovskite oxide surfaces, particularly at lower temperatures (T

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Enhanced membrane bioreactor process without chemical cleaning

Water Science & Technology, 2010

In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and tr... more In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and treated water takes place by membrane filtration. Due to the small footprint and superior effluent quality, the number of membrane bioreactors used in wastewater treatment is rapidly increasing. A major challenge in this process is the fouling of the membranes which results in permeability decrease and the demand of chemical cleaning procedures. With the objective of a chemical-free process, the removal of the fouling layer by continuous physical abrasion was investigated. Therefore, particles (granules) were added to the activated sludge in order to realise a continuous abrasion of the fouling layer. During operation for more than 8 months, the membranes showed no decrease in permeability. Fluxes up to 40 L/(m(2) h) were achieved. An online turbidity measurement was installed for the effluent control and showed no change during this test period. For comparison, a reference (standard MBR process without granules) was operated which demonstrated permeability loss at lower fluxes and required chemical cleaning. Altogether with this process an operation at higher fluxes and no use of cleaning chemicals will increase the cost efficiency of the MBR-process.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Understanding process dynamics at aquifer-surface water interfaces: An introduction to the special section on new modeling approaches and novel experimental technologies

Water Resources Research, 2014

ABSTRACT This paper introduces the special section on “New Modelling Approaches and Novel Experim... more ABSTRACT This paper introduces the special section on “New Modelling Approaches and Novel Experimental Technologies for Improved Understanding of Process Dynamics at Aquifer-Surface Water Interfaces”. It is contextualising the framework for the 27 research papers of the special section by firth identifying research gaps and imminent challenges for ecohydrological research at aquifer-surface water interfaces and then discussing the specific paper contributions on (i) New Developments in Temperature/Heat Tracing at GW-SW Interfaces, (ii) New methods to capture the temporal and spatial variability of groundwater – surface water exchange (iii) New Approaches in Modelling Aquifer-River Exchange Flow and (iv) New Concepts and Advanced Theory of Groundwater – Surface Water Exchange.

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Research paper thumbnail of Effect of mechanical cleaning with granular material on the permeability of submerged membranes in the MBR process

Water Research, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Current-Driven Spin Dynamics of Artificially Constructed Quantum Magnets

Science, 2013

The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic... more The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic control of atomic-scale magnets. The role of the substrate conduction electrons on the dynamics of supported atomic magnets is still a question of interest lacking experimental insight. We characterized the temperature-dependent dynamical response of artificially constructed magnets, composed of a few exchange-coupled atomic spins adsorbed on a metallic substrate, to spin-polarized currents driven and read out by a magnetic scanning tunneling microscope tip. The dynamics, reflected by two-state spin noise, is quantified by a model that considers the interplay between quantum tunneling and sequential spin transitions driven by electron spin-flip processes and accounts for an observed spin-transfer torque effect.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New retroviral vectors for tight regulated gene expression in hepatoma and embryonal liver cells

Journal of Hepatology, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The role of individuality in collective group movement

Proceedings of the Royal Society B: Biological Sciences, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 699 Long-term clinical outcomes of laboratory-based cocaine administration in individuals with cocaine dependence

Drug and Alcohol Dependence, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Accurate decisions in an uncertain world: collective cognition increases true positives while decreasing false positives

Proceedings of the Royal Society B: Biological Sciences, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Clinical outcomes following cocaine infusion in nontreatment-seeking individuals with cocaine dependence

Biological Psychiatry, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Temperature-dependent scanning tunneling spectroscopy on the Si(557)-Au surface

Physical Review B, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Strongly Reduced Number of Parvalbumin-Immunoreactive Projection Neurons in the Mammillary Bodies in Schizophrenia: Further Evidence for Limbic Neuropathology

Annals of the New York Academy of Sciences, 2007

The mammillary bodies (MB) are important relay nuclei within limbic and extralimbic connections. ... more The mammillary bodies (MB) are important relay nuclei within limbic and extralimbic connections. They are known to play important roles in memory formation and are affected in alcoholism and vitamin B1 deficiency. Their strategic position linking temporo-limbic to cortico-thalamic brain structures make the MB a candidate brain structure for alterations in schizophrenia. We studied 15 postmortem brains of schizophrenics and 15 matched control brains. Brain sections were stained either with Heidenhain-Woelcke, glutamic acid decarboxylase (GAD), calretinin, or parvalbumin. We determined the volumes of the MB and performed cell countings using stereological principles and a computerized image analysis system. The volumes of MB do not differ between schizophrenics and controls. However, in schizophrenia the number of neurons as well as the resulting neuronal densities was significantly reduced on both sides (on left side by 38.9%, on right side by 22%). No changes were seen in the number of GAD-expressing or calretinin-containing neurons, whereas the number of parvalbumin-immunoreactive MB neurons was reduced by more than 50% in schizophrenia. This cell loss (as a result of developmental malformation and/or neurodegeneration) points to a prominent involvement of the MB in the pathomorphology of schizophrenia. Parvalbumin-immunoreactive GABAergic interneurons have been reported to be diminished in schizophrenia. However, in the MB parvalbumin labels a subpopulation of glutamate/aspartate-containing neurons projecting mainly to the anterior thalamus. Thus, our data provide new evidence for impaired limbic circuits in schizophrenia.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of JChemPaint - Using the Collaborative Forces of the Internet to Develop a Free Editor for 2D Chemical Structures

Molecules, 2000

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Research paper thumbnail of Which senses play a role in nonhuman primate food selection? A comparison between squirrel monkeys and spider monkeys

American Journal of Primatology, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assortative interactions and leadership in a free-ranging population of juvenile lemon shark Negaprion brevirostris

Marine Ecology Progress Series, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Institutions, arrangements and preferences for inflation stability: Evidence and lessons from a panel data analysis

Journal of Macroeconomics, 2008

We study how monetary, exchange-rate and other institutional arrangements are associated with pol... more We study how monetary, exchange-rate and other institutional arrangements are associated with policy makers’ preferences for inflation stability. We argue that focusing on policy intentions, represented by these preferences, constitutes a better way of evaluating policy behavior, instead of looking at inflation outcomes that may be unavoidable at times.Using a panel of 34 countries over a period of 24years we

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Two dimensional band structure mapping of organic single crystals using the new generation electron energy analyzer ARTOF

Journal of Electron Spectroscopy and Related Phenomena, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Spatio-temporal variations of hyporheic flow in a riffle-step-pool sequence

Hydrological Processes, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Leadership in fish shoals

Fish and Fisheries, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hsp70-peptide activated autologous NK cells in the immunotherpay of cancer — a clinical pilot study

European Journal of Cancer, 2001

Bookmarks Related papers MentionsView impact