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Search Results: 1 - 10 of 7516 matches for " Henrik Schmidt "
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Constructing a Distributed AUV Network for Underwater Plume-Tracking Operations
Stephanie Petillo,Henrik Schmidt,Arjuna Balasuriya
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/191235
Abstract: In recent years, there has been significant concern about the impacts of offshore oil spill plumes and harmful algal blooms on the coastal ocean environment and biology, as well as on the human populations adjacent to these coastal regions. Thus, it has become increasingly important to determine the 3D extent of these ocean features (“plumes”) and how they evolve over time. The ocean environment is largely inaccessible to sensing directly by humans, motivating the need for robots to intelligently sense the ocean for us. In this paper, we propose the use of an autonomous underwater vehicle (AUV) network to track and predict plume shape and motion, discussing solutions to the challenges of spatiotemporal data aliasing (coverage versus resolution), underwater communication, AUV autonomy, data fusion, and coordination of multiple AUVs. A plume simulation is also developed here as the first step toward implementing behaviors for autonomous, adaptive plume tracking with AUVs, modeling a plume as a sum of Fourier orders and examining the resulting errors. This is then extended to include plume forecasting based on time variations, and future improvements and implementation are discussed.
Livestock grazing intensity affects abundance of Common shrews (Sorex araneus) in two meadows in Denmark
Niels M Schmidt, Henrik Olsen, Herwig Leirs
BMC Ecology , 2009, DOI: 10.1186/1472-6785-9-2
Abstract: High grazing intensity had a significant negative effect on Common shrew number compared to low grazing intensity and no grazing. Common shrew abundance was generally, but not significantly, higher on the low grazing intensity plots than on the ungrazed controls. No differences in body mass, sex ratio, or reproductive output between Common shrew individuals from the various grazing treatments were found.No negative effects of low intensity grazing on Common shrew abundance were found compared to the ungrazed control. Low intensity grazing thus seems a suitable management regime for Common shrews, when grazing is needed as part of the meadow management scheme. High intensity grazing on the other hand is not a suitable management tool.In Denmark as well as in most other European countries, the amount of land covered by semi-natural grassland has decreased dramatically during the 20th century concurrent with the general intensification of the agricultural production. To reverse this trend, actions are being taken in many places to either maintain or re-establish this biotope, and in particular, the meadow community. Today's nature conservation is a return to the old extensive agricultural methods, and includes grazing and hay cutting, as well as the abandonment of draining. Semi-natural grassland and in particular meadows constitute important habitat types for a large number of animal species in today's fragmented and intensively cultivated landscape in Europe.Hay cutting and livestock grazing is known to affect a number of organisms, but the response to grazing may vary across classes of organisms and with the intensity of grazing [[1], and references therein]. The effect of haying and grazing on plant diversity and composition is well-documented [e.g. [2-4]]. Also, many avian species may respond to grazing, and certain grazing intensities may favour some species over others [e.g. [5]]. In contrast to this, only limited data on the response of the mammalian vertebrate
Three-Dimensional Mode Coupling around a Conical Seamount and the Use of Random Discretization

LUO Wen-Yu,SCHMIDT Henrik,

中国物理快报 , 2010,
Abstract:
A Spectral Coupled-Mode Formulation for Sound Propagation around Axisymmetric Seamounts

LUO Wen-Yu,SCHMIDT Henrik,

中国物理快报 , 2010,
Abstract:
Correction: A novel mutation of the calcium sensing receptor gene is associated with chronic pancreatitis in a family with heterozygous SPINK1 mutations
Peter Felderbauer, Peter Hoffmann, Henrik Einw?chter, Kerem Bulut, Nikolaus Ansorge, Frank Schmitz, Wolfgang E Schmidt
BMC Gastroenterology , 2004, DOI: 10.1186/1471-230x-4-6
Abstract: The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-230X/4/6/prepub
A novel mutation of the calcium sensing receptor gene is associated with chronic pancreatitis in a family with heterozygous SPINK1 mutations
Peter Felderbauer, Peter Hoffmann, Henrik Einw?chter, Kerem Bulut, Nikolaus Ansorge, Frank Schmitz, Wolfgang E Schmidt
BMC Gastroenterology , 2003, DOI: 10.1186/1471-230x-3-34
Abstract: We studied a family with a FHH-related hypercalcemia and chronic pancreatitis. DNA samples were analysed for mutations within the cationic trypsinogen (N29I, R122H) and SPINK1 (N34S) gene using melting curve analysis. Mutations within CASR gene were identified by DNA sequencing.A N34S SPINK1 mutation was found in all screened family members. However, only two family members developed chronic pancreatitis. These patients also had FHH caused by a novel, sporadic mutation in the CASR gene (518T>C) leading to an amino acid exchange (leucine->proline) in the extracellular domain of the CASR protein.Mutations in the calcium sensing receptor gene might represent a novel as yet unidentified predisposing factor which may lead to an increased susceptibility for chronic pancreatitis. Moreover, this family analysis supports the hypothesis that SPINK1 mutations act as disease modifier and suggests an even more complex genetic model in SPINK1 related chronic pancreatitis.Chronic pancreatitis (CP) remains one of the big challenges among the GI-tract disorders. Since 1996 the understanding of genetic risk factors for CP extended with the discovery of different gene defects causing hereditary pancreatitis (HP). A French and two American groups were the first to identify chromosome 7q35 as a putative locus for HP [1-3]. The disease gene was mapped and a heterozygous point mutation A>T in exon 3 (R122H) of the protease serine 1 (PRSS1) was detected in a majority (~70%) of cases with cationic trypsinogen mutations [4]. Subsequently the PRSS1 mutations N29I (25%), A16V (<3%), K23R, D22G, R122C and N29T (several kindreds) were discovered [4-9]. The second gene that was characterized to be clearly associated with idiopathic chronic pancreatitis (ICP) was the cystic fibrosis transmembrane conductance regulator (CFTR) gene [10,11].The third gene that was postulated to be associated with ICP is the serine protease inhibitor Kazal type 1 (SPINK1). Initially an autosomal recessive inheritance
Power Spectrum Analysis for Optical Tweezers, II: Laser Wavelength Dependence of Parasitic Filtering, and how to Achieve High Band-Width
Kirstine Berg-Sorensen,Erwin J. G. Peterman,Tom Weber,Christoph F. Schmidt,Henrik Flyvbjerg
Physics , 2006, DOI: 10.1063/1.2204589
Abstract: In a typical optical tweezers detection system, the position of a trapped object is determined from laser light impinging on a quadrant photodiode. When the laser is infrared and the photodiode is of silicon, they can act together as an unintended low-pass filter. This parasitic effect is due to the high transparency of silicon to near-infrared light. A simple model that accounts for this phenomenon (Berg-Sorensen et al., J. Appl. Phys., 93, 3167-3176 (2003)) is here solved for frequencies up to 100 kHz, and for laser wavelengths between 750 and 1064 nm. The solution is applied to experimental data in the same range, and is demonstrated to give this detection system of optical tweezers a bandwidth, accuracy, and precision that is limited only by the data acquisition board's band-width and bandpass ripples, here 96.7 kHz, resp. 0.005 dB.
A Distributed Multimedia Communication System and its Applications to E-Learning
Hans L. Cycon,Thomas C. Schmidt,Matthias Waehlisch,Mark Palkow,Henrik Regensburg
Computer Science , 2005,
Abstract: In this paper we report on a multimedia communication system including a VCoIP (Video Conferencing over IP) software with a distributed architecture and its applications for teaching scenarios. It is a simple, ready-to-use scheme for distributed presenting, recording and streaming multimedia content. We also introduce and investigate concepts and experiments to IPv6 user and session mobility, with the special focus on real-time video group communication.
"Integrated Design Process" a Concept for Green Energy Engineering  [PDF]
Christian Koch, Henrik Buhl
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.53039
Abstract:

Consulting Engineers and Architects are currently experimenting with the concept of “Integrated Design Process” (IDP). This paper views Integrated Design Process as a process tool and a concept for management and organization of the green energy engineering process. Moreover such a concept is understood both as systematic knowledge and a symbolic device for enabling change. The paper briefly review international variants, and focus on two variants present in Denmark: an architect and engineering variant of IDP. The differences between the concepts include different roles for main actors, the use of information technology, the relation to lean, and forms of collaboration. The paper discusses two building projects focusing on teams of engineers and architects in the early conceptual phase. One develops a solution focused on energy saving technologies, the other on energy producing. It is argued that in this practical context, IDP is viewed as ambiguous and not well defined, and the architects and engineer work hard understanding and using the concepts even when directly involved. It is difficult to reach consensus on how to do it. The various players agree that an increased interdisciplinary interaction in the design team is necessary in order to comply with the increased complexity of green energy building design. IDP shows potential as a driver for green energy engineering and technologies, as traditional roles and responsibilities in the design process is changed, and sustainable solutions for green buildings can reach a higher standard and quality and are integrated earlier in the design process.

Distribution of Solar Irradiance on Inclined Surfaces Due to the Plane of the Ground  [PDF]
Teolan Tomson, Henrik Voll
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.27001
Abstract:

Measurements of solar radiation are ordinarily made on horizontal planes recording global, diffuse and reflected components. The beam component and distribution of the global radiation on tilted planes can be calculated via the said components, as the position of the Sun in the sky’s sphere is known. Another ordinary procedure is measuring beam and diffuse components and calculating global radiation. These measurements require stationary equipment and in such a way it is difficult to study the influence of different grounds on the distribution of radiation on the inclined surfaces due to the ground. This distribution has some importance in civil engineering, but it is not popular in the field of solar radiation investigations. Present paper shows how this distribution can be calculated measuring only global irradiance on the horizontal and vertical planes. Such an approach, which is valid in clear-sky and overcast conditions, allows the use of a portable measuring device and studies of different grounds. The coincidence of the calculated values with the actual is good, except for snow-cover and discrete cloud, which do not correspond to the isotropic sky and ground models.

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