Time filter

Source Type

Stuttgart Mühlhausen, Germany

Shikanai F.,Private | Tomiyasu K.,Tohoku University | Aso N.,University of Ryukyus | Itoh S.,High Energy Accelerator Research Organization | And 5 more authors.
Ferroelectrics | Year: 2011

Dynamical properties of protonic conductor K3H(SeO 4)2 were examined by using various techniques, Brillouin scattering, quasi elastic, and inelastic neutron scattering. No significant anomaly was observed in longitudinal and transverse acoustic modes. In each experiment, a Lorentzian shaped spectrum was observed at extremely low energy, (less than 0.1 meV). The spectra in Brillouin and inelastic neutron scattering at the zone boundary originate from rotational modes of SeO4 tetrahedra at Γ-and L-point, respectively. The peak positions, shapes, and widths of the spectra are consistent with each other, while the integrated intensities show complementary temperature dependence. The lifetimes of those modes, about 10-10 s, agree with the stationary time of conduction protons obtained from Q dependence of width in quasi elastic neutron scattering. Copyright © Taylor & Francis Group, LLC.

Ziemke C.,University of Stuttgart | Kuwahara T.,Tohoku University | Kossev I.,Private
61st International Astronautical Congress 2010, IAC 2010 | Year: 2010

Even in the field of small satellites, the on-board data handling subsystem has become complex and powerful. With the introduction of powerful CPUs and the availability of considerable quantities of memory on-board a small satellite it has become possible to utilize the flexibility and power of contemporary platform-independent real-time operating systems. Especially the non commercial sector like university institutes and community projects such as AMSAT or SSETI are characterized by the inherent lack of financial as well as manpower resources. The opportunity to utilize such real-time operating systems will contribute significantly to achieve a successful mission. Nevertheless the on-board software (OBSW) of a satellite is much more than just an operating system. It has to fulfil a multitude of functional requirements such as: Telecommand interpretation and execution, execution of control loops, generation of telemetry data and frames, failure detection isolation and recovery, the communication with peripherals and so on. Most of the aforementioned tasks are of generic nature and have to be conducted on any satellite with only minor modifications. A general set of functional requirements as well as a protocol for communication is defined in the ESA ECSS-E-70-41A standard "Telemetry and telecommand packet utilization". This standard not only defines the communication protocol of the satellite-ground link but also defines a set of so called services which have to be available on-board of every compliant satellite and which are of a generic nature. In this paper a platform-independent and reusable framework is described which is implementing not only the ECSS-E-70-41A standard but also functionalities for inter-process communication, scheduling and a multitude of tasks commonly performed on-board of a satellite. By making use of the capabilities of the high-level programming language C/C++, the powerful open source library BOOST, the real-time operating system RTEMS and finally by providing generic functionalities compliant to the ECSS-E-70-41A standard the proposed framework can provide a great boost in productivity. Together with open source tools such like the GNU tool-chain, Eclipse SDK, the simulation framework OpenSimKit, the emulator QEMU, the proposed OBSW framework forms an integrated development framework. It is possible to design, code and build the on-board software together with the operating system and then run it on a simulated satellite for performance analysis and debugging purposes. This makes it possible to rapidly develop and deploy a full-fledged satellite OBSW with minimal cost and in a limited time frame. Copyright ©2010 by Claas Ziemke. Published by the American Institute of Aeronautics and Astronautics, Inc.

Klauer B.,Helmholtz Center for Environmental Research | Schiller J.,Helmholtz Center for Environmental Research | Bathe F.,Private
Journal of Environmental Planning and Management | Year: 2015

The EU Water Framework Directive calls for cost effective measures to achieve a “good status” in all European ground, surface and coastal waters. Besides eutrophication, the degradation of hydromorphology is the main reason for failing this objective. In this paper, we conceptualise the interactive decision support process BASINFORM-M for finding proper locations for river restoration. The concept combines the recently proposed “stepping stone approach” from aquatic ecology with elements from cost effectiveness analysis, multi-criteria analysis and participatory approaches. BASINFORM-M exemplifies a shift away from the isolated restoration of single river reaches towards a consideration of functional relationships within river networks. © 2014 University of Newcastle upon Tyne.

Mayseless M.,iML Inc | Hirsch E.,Private
25th International Symposium on Ballistics, ISB 2010 | Year: 2010

The mass density of charge jets formed from porous liners, made of compressed powder, diminishes with ongoing time of flight. A model was developed based on the assumption that each jet element acquires a radial velocity component, V^ , due to a friction mechanism inside the jet. Comparing the developed model results, by employing the SCAN semi- analytical code, with the experimental data of a penetration depth of a porous jet versus time, we found that agreement with the data for Vn = 3.8 m/sec was excellent. With this fitted value the SCAN code yielded the characteristics of the jet parameters' change as a function of the penetration, explaining the source of the benefit of using porous liners in the penetration of concrete and sediment materials. The model opens the way to detailed analysis of where and when the use of porous liners is preferable to the use of solid ones, and vice versa. The details are explained in fiill in the complete paper.

Calkavur S.,Intensive Care Unit | Olukman O.,Intensive Care Unit | Ercan G.,Intensive Care Unit | Kokkun S.,Intensive Care Unit | And 3 more authors.
Turkiye Klinikleri Journal of Medical Sciences | Year: 2013

Objective: Atelectasis increases the risk of secondary pulmonary infections related with prolonged artificial ventilation. Therefore, it requires early and aggressive treatment in newborns cared in neonatal intensive care units (NICUs). Current treatment of atelectasis consists of certain conventional modalities. However, there is still no evidence-based, "gold standard" treatment. Use of recombinant human deoxyribonuclease (rhDNase) is a new concept in NICUs. In this study, we aimed to compare and evaluate the clinical and radiological changes in infants who received nebulized or intratracheal rhDNase for persistent atelectasis unresponsive to conventional treatment options. Material and Methods: This study was conducted in 23 newborns hospitalized at the NICU of Dr. Behcet Uz Children's Hospital. Twelve intubated patients received 1.25 mg rhDNase mixed with 1:1 0.9% saline intratracheally, whereas 11 non-intubated patients received the drug via a jet nebulizer. A second dose was administered 4 hours after the initial dose. Chest physiotherapy and tracheal aspiration was performed 1 hour after the second dose. The same protocol was repeated on the second day. Clinical and radiological responses were evaluated separately. Results: Positive radiological and clinical responses to rhDNase and recurrence of atelectasis in the whole study group were 78.3%, 56.3% and 16.7% respectively. Nebulized route was more successful than the intratracheal route. Response to rhDNase was better in cases with upper lung lobe involvement. Conclusion: Both nebulized and intratracheal rhDNase administrations are successful without any adverse reactions for the treatment of persistent atelectasis, especially in neonates with viscous secretions and pneumonia with upper lobe atelectasis. © 2013 by Türkiye Klinikleri.

Discover hidden collaborations