Maria T. Kluge

Maria T. Kluge
verein für schtsamkeit - osterloh · seminare

About

219
Publications
13,059
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5,885
Citations
Citations since 2017
11 Research Items
1106 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Introduction
Skills and Expertise

Publications

Publications (219)
Article
We explore several ways to dissect brightest cluster galaxies (BCGs) and their surrounding intracluster light (ICL) using a surface brightness (SB) cut, a luminosity cut, excess light above a de Vaucouleurs profile, or a double Sérsic decomposition. Assuming that all light above M < -21.85 g' mag is attributable to the ICL, we find that an average...
Preprint
We explore several ways to dissect Brightest Cluster Galaxies (BCGs) and their surrounding Intracluster Light (ICL) using a surface brightness cut, a luminosity cut, excess light above a de Vaucouleurs profile, or a double S\'ersic decomposition. Assuming that all light above $M<-21.85~g'~\rm{mag}$ is attributable to the ICL, we find an average ICL...
Article
Full-text available
Respiratory rate and changes in respiratory activity provide important markers of health and fitness. Assessing the breathing signal without direct respiratory sensors can be very helpful in large cohort studies and for screening purposes. In this paper, we demonstrate that long-term nocturnal acceleration measurements from the wrist yield signific...
Article
Observations of 170 local (z ≲ 0.08) galaxy clusters in the northern hemisphere have been obtained with the Wendelstein Telescope Wide Field Imager (WWFI). We correct for systematic effects such as point-spread function broadening, foreground star contamination, relative bias offsets, and charge persistence. Background inhomogeneities induced by sc...
Article
Full-text available
The high temporal and intensity resolution of modern accelerometers gives the opportunity of detecting even tiny body movements via motion-based sensors. In this paper, we demonstrate and evaluate an approach to identify pulse waves and heartbeats from acceleration data of the human wrist during sleep. Specifically, we have recorded simultaneously...
Preprint
Observations of 170 local (z<0.08) galaxy clusters have been obtained with the Wendelstein Telescope Wide Field Imager. We correct for PSF broadening, foreground stars contamination, relative bias offsets and charge persistence. Scattered light induced background inhomogeneities are reduced down to a surface brightness (SB) of >31 g' mag arcsec$^{-...
Preprint
Holm 15A, the brightest cluster galaxy (BCG) of the cool-core cluster Abell 85, has an ultra-diffuse central region, 2 mag fainter than the faintest depleted core of any early-type galaxy (ETG) that has been dynamically modelled in detail. New photometric data taken at the Wendelstein observatory confirm the previously noted unusual, near-exponenti...
Article
We present results from the Wendelstein Weak Lensing (WWL) pathfinder project, in which we have observed three intermediate-redshift Planck clusters of galaxies with the new 30 arcmin × 30 arcmin wide field imager at the 2 m Fraunhofer Telescope at Wendelstein Observatory. We investigate the presence of biases in our shear catalogues and estimate t...
Conference Paper
Full-text available
The paper summarises the main contributions to the 8th Symposium on Mindfulness in Education at the University of Vienna in January 2020. The conference was hosted by the project "Mindfulness in Teacher Education and Schools" led by Dr. Karlheinz Valtl.
Conference Paper
Full-text available
The paper summarises the main contributions to the 3rd Symposium on Mindfulness in Education at the University of Vienna in January 2020. The conference was hosted by the project "Mindfulness in Teacher Education and Schools" led by Dr. Karlheinz Valtl.
Article
Determination of deflagration venting requirements in chemical/process plants is usually carried out using well established standards employing an empirically based formula. However, this formula is shown to have severe shortcomings, especially in the range of low KG-values, where either negative or inconceivably large venting areas can be predicte...
Article
Full-text available
Infinitely thin opaque screens serving for diaphragms as defined in the visible-light optics are not feasible for operation with X-ray beams due to their high penetrability. Micro-openings of predicted sidewall shape in a gold layer up to 140 μm thick which would provide low transparency, are proposed. The proposed micro-openings were made using th...
Article
Full-text available
In our X-ray full field microscopy experiments, we demonstrated a resolution better than 260 nm over the entire field of view of 80 μm × 80 μm at 30 keV. Our experimental setup at PETRA III, P05, had a length of about 5 m consisting of an illumination optics, an imaging lens and a detector. For imaging, we used a compound refractive lens (CLR) cons...
Article
The idea of thermoelectric energy harvesting for low-power wireless sensor systems in aircraft and its practical implementation was recently published. The concept of using a thermoelectric generator (TEG) attached to the aircraft inner hull and a thermal storage device to create an artificial temperature gradient at the TEG during take-off and lan...
Article
An energy autonomous wireless sensor system consisting of an energy harvesting power source, an energy management unit and a low power wireless sensor node is tested for aircraft applications. The autonomous power source combines aircraft specific outside temperature changes with a thermoelectric generator (TEG) and a heat storage unit. The tempera...
Conference Paper
In material science, X-ray radiation with photon energies above 25 keV is used because of its penetration into high density materials. Research of the inner structure of novel materials, such as electrodes in high power batteries for engines, require X-ray microscopes operating in the hard X-ray energy range. A flexible X-ray microscope for hard X...
Article
A new atomistic-simulation method for calculating the full local elastic-constant tensor in terms of local stress and local strain for inhomogeneous systems is described. Results of simulations of an isolated high-angle twist grain boundary are presented. A dramatic reduction in resistance to shear parallel to the grain boundary is observed, and it...
Article
Results of computer simulations of diffusion and relaxation in the liquid and the glassy state are presented for model systems and Cu33Zr67 and Se. The diffusion constant and the intermediate self scattering function show the typical behavior upon quenching from the liquid to the glass. The diffusion constant in the undercooled liquid can be fitted...
Article
Full-text available
An energy autonomous wireless sensor system consisting of an energy harvesting power source, an energy management unit and a low power wireless sensor node is tested for aircraft applications. The autonomous power source combines aircraft specific outside temperature changes with a thermoelectric generator (TEG) and a heat storage unit. The tempera...
Article
Autonomous sensor nodes for wireless sensor networks are currently under discussion for aircraft structural health monitoring. Self-sufficient operation of a sensor node requires a positive power budget for sensing, processing, and communication tasks. Energy harvesting for autonomous powering by thermoelectric devices depends strongly on maintaini...
Article
Zusammenfassung Energieautonome Funknetzwerkknoten sind die Grundlage für vielfältige Überwachungsaufgaben, die drahtlos übernommen werden können. Ein Sensornetzwerk ist in der Lage, Überwachungsaufgaben kosteneffizient zu übernehmen, wenn Maßnahmen zur Energieversorgung wegfallen. Daher ist dieser Ansatz für die Luftfahrtindustrie interessant, um...
Article
This paper deals with the design of a vibration minigenerator and its power management electronics. The minigenerator is used as the independent energy source for wireless temperature sensors in NH-90 helicopters. The power management electronics is useful for this purpose as there exists interdependence between the generator output voltage instabi...
Article
The next generation of aircraft seats will be able to support cabin crews in their daily work: Ubiquitous wireless sensors will be embedded in the seat and report information like occupancy, backrest, armrest, tray table position and seatbelt status to a remote flight attendance panel. Answering to the major challenge of self-sufficient operation o...
Article
Impact damage is one of the many types of damage that require monitoring on materials, such as composites. Many technologies have been used in the past but not all can cope with industry's demands in terms of material thickness to be monitored, low recurring cost for the equipment and its installation, low power consumption equipment due to small p...
Article
—The current trend towards the use of novel materials and design concepts for aircraft structures may demand structural health monitoring (SHM) systems in the future. Wireless sensor networks (WSNs) could fulfill the required monitoring tasks concerning fatigue, damage or stress of structural parts. Autonomous sensor nodes (ASNs) are key elements f...
Article
Full-text available
This paper deals with the design of the power management circuit for the vibration generator developed in the frame of the European WISE project and its testing in the connection with the generator and the dynamic load simulating the real load. This generator is used as an autonomous energy source for wireless sensor applications. It can be used fo...
Conference Paper
Full-text available
In modern aeronautics and aerospace industry there is a great demand for wireless sensors in order to improve efficiency, reliability and to reduce the costs. They are the key enablers for improved system concepts like e.g. condition based maintenance. In some cases, sensors need to be placed in closed conductive envelopes like hydraulic accumulato...
Conference Paper
Full-text available
Energy harvesting for wireless sensors and sensor networks becomes more and more popular in recent years. Many different energy scavengers have been discussed; however their deployment depends strongly on the environmental conditions. This paper describes the system development for using thermal energy harvesting in aircraft applications. It addres...
Article
Full-text available
This paper describes the development of an intrusion detection system for container security applications. In particular it addresses the development and implementation of intrusion detection algorithms. Container security became an important issue due to the recent attacks and incidents in the world. However up to now no cost-effective ultra low p...
Article
This paper will present final results from this ESA-funded study that has investigated how current and emerging concepts for nanosats may be used to monitor space weather conditions and provide improved access to data needed for space weather services. The study has reviewed requirements developed in previous ESA space weather studies to establish...
Conference Paper
In this work, we present experimental results on the long-term performance of ultrasonic transducers elements. For aeronautic applications these devices are targeted for the wireless transmission of energy and data to and from sensor elements placed inside of hermetically sealed metal envelopes, typically used e.g. for hydraulic accumulators, oxyge...
Article
In Mesembryanthemum crystallinum plants, treated for 9 days with 0.4 M NaCl at low light intensities (80 - 90 or 95 - 100 μE m-2 s-1; λ = 400 - 700 nm), no day/night malate level differences (Δmalate) were detected. At high light (385 - 400 μE m-2 s-1) strong stimulation of PEPC activity, accompanied by a Δmalate of 11.3 mM, demonstrated the presen...
Article
Causal explanation of the mechanisms behind ecological adaptation in plants requires research on different levels of scaling, ranging from molecules to plants in their natural environment. In the following article this is illustrated by a description of the author's scientific life-work mainly with respect to the crassulacean acid metabolism (CAM)...
Chapter
We present the results of computer simulations of both glasses and liquids. To distinguish between material dependent an more universal properties different systems have been studied. We show that the atomic motion is highly collective in both states. This leads to the also experimentally observed small isotope effects in diffusion. Collectivity is...
Article
This paper describes asynchronous MAC (Medium Access Control) strategies based on the IEEE 802.15.4 physical layer for wireless aeronautical applications where low power and low latency are important requirements as well as security and data integrity. Sensor data is acquired and collected on request, by means of a mobile device, and later stored i...
Conference Paper
In the modern aeronautics and aerospace industry, there is a manifold amount of applications emerging for wireless sensors. While many new systems are making use of radio transmitters, EADS Innovation Works has developed a concept for transmitting energy and data to the inside of hermetically sealed envelopes used for hydraulic accumulators, fuel t...
Article
Diffusion in metallic glasses and their undercooled melts is a highly collective process which upon quenching passes from flow to hopping. In the undercooled liquid one can still describe diffusion by jumps which, however, are too rapid for the system to thermalize between jumps. In our previous work on diffusion in Cu33Zr67 we found that there are...
Article
Since about 1980, perfluoroalkoxy (PFA) thermoplastic has been used as cladding for pumps, fittings, control valves, and vessels and other equipment as an alterative to highly alloyed costly materials. In this use, PFA has replaced PTFE to a large extent. PFA, because of its dense molecular structure has, at the same wall thickness, a lower permeat...
Article
In the CAM plants, Kalanchoë tubiflora (Harvey) Hasset, Sedum morganianum E. Walth and Sedum rubrotinctum R. T. Clausen, the effects of CO2 concentrations on the light-dependent 14C transfer from the nocturnally synthetized [14C]-malic acid to starch have been studied. CO2 concentrations up to 5 × 103 μ1 1–1 did not inhibit this carbon transfer. Hi...
Article
Abstract From Sedum morganianum, which is a plant species known to have constitutive crassulacean acid metabolism (CAM), phosphoenolpyruvate (PEP) carboxylase (E.C.4.1.1.31) has been extracted and purified by (NH4)2SC4 precipitation, ion exchange chromatography and gel electrophoresis. A specific antibody to this purified enzyme was obtained by imm...
Article
Abstract The paper reports the results of the comprehensive study of crassulacean acid metabolism in two epiphytic tropical ferns, Drymoglossum piloselloides and Pyrrosia longifolia. The plants were investigated under different light, temperature and water status. It was found that both species are obligate CAM plants. The diurnal acidity rhythm is...
Article
Abstract Crassulacean acid metabolism (CAM) was studied in mixotrophic callus tissue cultures of Kalanchoë blossfeldiana hybr. Montezuma and compared with plants propagated from the calli. The ultrastructural properties of the green callus cells are similar to mesophyll cells of CAM plants except that occasionally abnormal mitochondria were observe...
Article
PEP-carboxylase was extracted and partially purified from nine species of the genus Sedum and three species of the genus Kalanchoe, all performing CAM. Immunological and molecular properties of these enzymes were compared. Molecular weight estimation with gradient slab gels showed identical molecular weights of about 232,000 for all PEP-carboxylase...
Article
The reasons for CO2 release by some CAM plants during the light period were investigated by comparative gas-exchange studies with three leaf-succulent species, Kalanchoë tubiflora Hamet, Sedum morganianum E. Walth. and Sempervivum tectorum L. Sempervivum showed net CO2 output during the day at constant day-night temperatures of both 15 and 25°C, wh...
Chapter
Every modern high-pressure turbine needs a highly sophisticated cooling system. The most frequently used cooling method of to date is film cooling, characterized by a high degree of interaction between the main flow and the cooling flow. Therefore the effects of film cooling have to be taken into account in the aerodynamic design of film cooled hig...
Article
This talk will present results from an ESA-funded study that has investigated how current and emerging concepts for nanosats may be used to monitor space weather conditions and provide improved access to data needed for space weather services The study has reviewed requirements developed in previous ESA space weather studies to establish a set of s...
Conference Paper
This paper presents preliminary results from this ESA-funded study, which started in November 2004 and is now under final review by ESA, due for public release later this year. The primary aim of the study has been to investigate how current and emerging concepts for nanosats may be used to monitor space weather conditions and provide improved acce...
Article
Thermoplastic fluoroplastic perfluoroalkoxy (PFA) linings have proved as cost-effective alternatives to expensive high-alloy metals on aggressive duties. Being processed in a transfer molding process, they enable accurate defining and reproducibility of thickness. PFA is almost transparent and therefore permits much more reliable quality control. P...
Article
Full-text available
We present a comprehensive study on femtosecond laser-induced refractive index modification in a wide variety of multicomponent glasses grouped as borosilicate, aluminum�silicate, and heavy-metal oxide glasses along with lanthanum�borate and sodium�phosphate glasses. By using high-spatial resolution refractive index profiling techniques, we demonst...
Article
Using molecular-dynamics simulation, we calculate the distribution of atomic jumps in Cu33Zr67 in the liquid and glassy states. In both states the distribution of jump lengths can be described by a temperature-independent exponential of the length and an effective activation energy plus a contribution of elastic displacements at short distances. Up...
Conference Paper
The paper concerns a silicon micromachined tuning fork gyroscope, which is driven via two piezo-electric thin film actuators. The device responds to an external angular rate by a torsional motion around its sensitive axis due to the Coriolis effect. The shear strain in the upper torsional stem, which is proportional to the angular rate, is detected...
Article
Full-text available
Deep sternal wound infection (DSWI) remains a serious complication after cardiac surgery. New evolving techniques including the utilization of internal mammary arteries (IMA), beating heart procedures, and minimal invasive surgery (MIC) require an updated risk factor analysis to identify high risk patients in order to improve perioperative treatmen...
Article
To better understand the evolution of the enzyme phosphoenolpyruvate carboxylase (PEPC) and to test its versatility as a molecular character in phylogenetic and taxonomic studies, we have characterized and compared 70 new partial PEPC nucleotide and amino acid sequences (about 1100 bp of the 3' side of the gene) from 50 plant species (24 species of...
Article
The study presents an analysis of genotypic diversity in the genus Kalanchoe (Crassulaceae) on the level of Internal Transcribed Spacer (ITS) sequences and the attempt to correlate this diversity with previous findings on ecophysiological behavior, habitat preference, infrageneric taxonomic position of the species and DNA polymorphism derived from...
Article
On the basis of δ¹³C-values, genotypic diversity and phenotypic plasticity of CAM behaviour in plants of the Malagasy vegetation is surveyed. The study compares CAM patterns performed in the wild on the levels of genera (Kalanchoë [Crassulaceae], Angraecum [Orchidaceae], Lissochilus [Orchidaceae] and Rhipsalis [Cactaceae]), on the level of a family...
Article
We present the results of computer simulations of diffusion and relaxation both in the liquid and the glassy states. To be able to distinguish between glass typical and material dependent properties, both model systems (Lennard-Jones and soft sphere) and real materials (CuZr and Se) are simulated. The diffusion constant and the intermediate self sc...
Article
The detergent Brij 58 has been introduced to reverse plasma membrane (PM) vesicles from the right-side-out to the inside-out form. The aim of the present work was to investigate the effect of Brij 58 on the formation of an ATP-dependent proton gradient and on the fluidity of the lipid phase of PM vesicles. PMs of corn (Zea mays L.) roots were isola...
Article
Geosiphon pyriforme (Kütz.) v. Wettstein is a coenocytic soil fungus and until now the only known example of a fungus living in endocytobi-otic association with a cyanobacterium, i.e. with Nostoc punctiforme. The symbiotic nature of the system was first recognized by F.v. Wettstein (1915), who described it as a symbiosis between a heterotrophic sip...
Article
The diffusional isotope effect of a monatomic Lennard-Jones liquid is calculated by molecular-dynamics simulation. Mass differences of 10\char21{}40 % were used. At equilibrium density, with decreasing temperature a strong reduction of the isotope effect is found that indicates a marked increase of the collectivity of motion. Changing the density a...
Chapter
As described in Chapter 4, this Volume (Porembski et al.) in more detail, inselbergs represent by no means uniform ecosystems but rather show clear fragmentation in subhabitats such as exposed rock surfaces, drainage channels, crevices between rocks, humus-filled depressions on top or the slopes of the rocks, or even wet flushes and seasonal rock p...
Chapter
1996 wurde in der Klinik für Herzchirurgie im Herzzentrum Leipzig GmbH — Universität Leipzig das Medizinische Dokumentationssystem MeworkTM eingeführt (1). Inzwischen wird das System von mehr als 200 Mitarbeitern in allen Bereichen der Klinik (Ärzte, OP-Pflegepersonal, Stationspersonal, Verwaltung) in der täglichen Routine benutzt. Allein im Jahr 1...
Article
In molecular dynamics (MD) simulations of amorphous solids two distinct types of jump processes have been observed: collective jumps where a single atom moves only a fraction of the interatomic distance, and jumps where single atoms move over interatomic distances. Different jumps can interact via their long range displacement fields. Compared to v...
Article
In an Arrhenius representation the self-diffusion constant in under-cooled liquids decreases upon cooling to the glass transition temperature. We present results of computer simulations of molten Zr67Cu33 at temperatures down to the glass transition. Analyzing the atomic displacements we observe two processes contributing to diffusion: a more flow-...
Article
The influence of growth temperature and salinity stress on the fluidity of the tonoplast and plasmalemma in Hordeum vulgare cv. Alexis was studied. Membrane fluidity was monitored by measurements of fluorescence polarisation in membrane vesicles labeled with the fluorescent fatty acid analogue 1,6-diphenyl- 1,3,5-hexatrien (DPH) as a probe. It was...
Article
This study provides the first comparative analysis of phosphoenolpyruvate carboxylase isoforms (PEPc; EC 4.1.1.31) in an obligate crassulacean acid metabolism (CAM) plant, Vanilla planifolia Salisb. (Orchidaceae). Nocturnal CO2 fixation and malate accumulation by the leaves and the green stem show that these organs perform CAM. The chloroplast-cont...
Article
The present study deals with the phenotypic adaptation of tonoplast fluidity in the CAM plant Kalanchoë daigremontiana to changes in growth temperature. Tonoplast fluidity was characterized by measuring fluorescence depolarization in membranes labeled with fluorescent fatty acid analogues and by following formation of eximeres in membranes labeled...
Article
Norway spruce (Picea abies Karst.) seeds were frozen and stored for 15 months at +3, -25, -75 or -196 °C. After storage, seeds were germinated for 9-14 days to determine viability and plasma membrane protein composition, H+-ATPase activity and fluidity. The results indicate no significant differences in viability of seed 14 days after germination....
Article
The present study is an investigation on photosynthetic options in an orchid taxon and deals with the mainly epiphytes comprising genus Angraecum Bory. The incidence of crassulacean acid metabolism (CAM) in Angraecum species collected at various habitats in Madagascar was surveyed by analysis of stable carbon isotope composition (13C values). The v...
Article
To get deeper insight into the evolution of phosphoenolpyruvate carboxylase we have identified PEPC fragments (about 1,100 bp) of another 12 plants species not yet investigated in this context. The selected plants include one Chlorophyta, two Bryophyta, four Pteridophyta, and five Spermatophyta species. The obtained phylogenetic trees on PEPC isofo...
Chapter
Seit Mai 1996 erfolgt in der Klinik für Herzchirurgie des Herzzentrums Leipzig die Erfassung und Dokumentation der patientenbezogenen Daten sowie der Qualitätssicherung auf der Basis des Medizinischen Dokumentationssystems MedworkTM (Firma Lenz & Partner). Bei der Einführung des Systems wurde die Forderung zugrunde gelegt, die Daten am Entstehungso...
Article
Mesophyll cells of the CAM plant Kalanchoe daigremontiana exhibit a very low sensitivity towards sulphite. Twenty mmol L−1 sulphite concentration in the presence of 10 mmol L−1 bicarbonate does not bring about an inhibition of photosynthetic 14CO2-fixation, rather, it even stimulates this process. Sulphite also shifted the labelling pattern obtaine...
Article
The paper reports on studies dealing with the effects of sulphite on the fluidity of the tonoplast in the CAM plant Kalanchoë daigremontiana. Temperature profiles of membrane fluidity were monitored by measurements of fluorescence polarisation in fluorescence labelled tonoplastic vesicles. It was found that sulphite applied to leaf tissue prior to...
Article
Full-text available
Nostoc punctiforme is the microsymbiont of the unique fungal endocyanosis Geosiphon pyriforme. During the establishment of this endosymbiosis fungal hyphae incorporate a specific stage of the N. punctiforme life cycle, formed during differentiation from the motile hormogonium to the non-motile primordium stage. The life cycle of N. punctiforme was...
Article
Nostoc punctiforme is the microsymbiont of the unique fungal endocyanosis Geosiphon pyriforme. During the establishment of this endosymbiosis fungal hyphae incorporate a specific stage of the N. punctiforme life cycle, formed during differentiation from the motile hormogonium to the non-motile primordium stage. The life cycle of N. punctiforme was...