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Search Results: 1 - 10 of 93868 matches for " Stefan W nstedt "
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Scheduling for Improving System Capacity in Multiservice 3GPP LTE
Francisco Rafael Marques Lima,Stefan W nstedt,Francisco Rodrigo Porto Cavalcanti,Walter Cruz Freitas Junior
Journal of Electrical and Computer Engineering , 2010, DOI: 10.1155/2010/819729
Abstract: We study the impact of scheduling algorithms on the provision of multiple services in the long term evolution (LTE) system. In order to measure how well the services are provided by the system, we use the definition of joint system capacity. In this context, we claim that scheduling strategies should consider the current satisfaction level of each service and the offered load to the system by each service. We propose a downlink-scheduling strategy according to these ideas named capacity-driven resource allocation (CRA). The CRA scheduler dynamically controls the resource sharing among flows of different services such as delay-sensitive and rate demanding ones. Moreover, CRA scheduler exploits the channel-quality knowledge to utilize the system resources efficiently. Simulation results in a multicell scenario show that the CRA scheduler is robust regarding channel quality knowledge and that it provides significant gains in joint system capacity in single and mixed service scenarios.
Engineered Transitions in Photonic Cavities  [PDF]
Ali W. Elshaari, Stefan F. Preble
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.24030
Abstract: We demonstrate for the first time, to best of our knowledge, that by engineering the states of a system of cavities it is possible to control photon transitions using non-adiabatic refractive index tuning. This is used to realize a novel photon transitions that are independent of the refractive index sign. In particular, we show through coupled mode theory and FDTD simulations that red shifts are possible in silicon resonators using the free-carrier plasma dispersion refractive index reduction.
Engineered Transitions in Photonic Cavities  [PDF]
Ali W. Elshaari, Stefan F. Preble
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.24030
Abstract:

We demonstrate for the first time, to best of our knowledge, that by engineering the states of a system of cavities it is possible to control photon transitions using non-adiabatic refractive index tuning. This is used to realize a novel photon transitions that are independent of the refractive index sign. In particular, we show through coupled mode theory and FDTD simulations that red shifts are possible in silicon resonators using the free-carrier plasma dispersion refractive index reduction.

Role of primary surgery in advanced ovarian cancer
Karsten Münstedt, Folker E Franke
World Journal of Surgical Oncology , 2004, DOI: 10.1186/1477-7819-2-32
Abstract: We reviewed published reports on primary surgical treatment, surgical expertise, inadequate primary surgery/quality assurance, neoadjuvant chemotherapy, interval debulking, and surgical prognostic factors in advanced ovarian cancer to help resolve outstanding issues.The aim of primary surgery is a well-planned and complete intervention with optimal staging and surgery. Surgical debulking is worthwhile as there are further effective treatments available to control unresectable residual disease. Patients of gynecologic oncology specialist surgeons have better survival rates. This may reflect a working 'culture' rather than better technical skills. One major problem though, is that despite pleas to restrict surgery to experienced surgeons, specialist centers are often left to cope with the results of inadequate primary surgical resections. Patients with primary chemotherapy or those who have had suboptimal debulking may benefit from interval debulking. A proposal for a better classification of residual tumor is given.Optimal surgical interventions have definite role to play in advanced ovarian cancers. Improvements in surgical treatment in the general population will probably improve patients' survival when coupled with improvements in current chemotherapeutic approaches.The Fédération Internationale de Gynécologie et d'Obstétrigue (FIGO) classifies ovarian carcinoma in stage I to IV [1,2]. Stage I has been defined as growth limited to the ovaries; stage II as growth involving one or both ovaries with pelvic extension; stage III as tumor involving one or both ovaries with peritoneal implants, and outside the pelvis and/or positive retroperitoneal or inguinal nodes and stage IV as having distant metastasis [1,2].Tumors in stages I and II are generally considered to represent early disease, while stages III and IV evince late or advanced disease [3,4]. The strong prognostic value of the FIGO classification system has been proved in number of studies [5].Unfortunately, mo
Editorial
Stefan W Hell
Optical Nanoscopy , 2012, DOI: 10.1186/2192-2853-1-1
Abstract:
A radiometer for stochastic gravitational waves
Stefan W. Ballmer
Physics , 2005, DOI: 10.1088/0264-9381/23/8/S23
Abstract: The LIGO Scientific Collaboration recently reported a new upper limit on an isotropic stochastic background of gravitational waves obtained based on the data from the 3rd LIGO science Run (S3). Now I present a new method for obtaining directional upper limits that the LIGO Scientific Collaboration intends to use for future LIGO science runs and that essentially implements a gravitational wave radiometer.
B -> V gamma at NLO from QCD Factorization
Stefan W. Bosch
Physics , 2001, DOI: 10.1063/1.1478843
Abstract: We discuss the exclusive radiative B-meson decays B -> K* gamma and B -> rho gamma in a model-independent manner. The analysis is based on the heavy-quark limit of QCD. This allows a factorization of perturbatively calculable contributions to the B -> V gamma matrix elements from non-perturbative form factors and universal light-cone distribution amplitudes. These results allow us to compute exclusive b -> s(d) gamma decays systematically beyond the leading logarithmic approximation. We present results for these decays complete to next-to-leading order in QCD and to leading order in the heavy-quark limit. Phenomenological implications for various observables of interest are discussed, including direct CP violation and isospin breaking effects.
Photo-Thermal Transfer Function of Dielectric Mirrors for Precision Measurements
Stefan W. Ballmer
Physics , 2014, DOI: 10.1103/PhysRevD.91.023010
Abstract: The photo-thermal transfer function from absorbed power incident on a dielectric mirror to the effective mirror position is calculated using the coating design as input. The effect is found to change in amplitude and sign for frequencies corresponding to diffusion length comparable to the coating thickness. Transfer functions are calculated for the $Ti$-doped ${\rm Ta_2O_5:SiO_2}$ coating used in Advanced LIGO and for a crystalline ${\rm Al_xGa_{1-x}As}$ coating. The shape of the transfer function at high frequencies is shown to be a sensitive indicator of the effective absorption depth, providing a potentially powerful tool to distinguish coating-internal absorption from surface contamination related absorption. The sign change of the photo-thermal effect could also be useful to stabilize radiation pressure-based opto-mechanical systems. High frequency corrections to the previously published thermo-optic noise estimates are also provided. Finally, estimating the quality of the thermo-optic noise cancellation occurring in fine-tuned ${\rm Al_xGa_{1-x}As}$ coatings requires the detailed heat flow analysis done in this paper.
The Centrality of Religiosity Scale (CRS)
Stefan Huber,Odilo W. Huber
Religions , 2012, DOI: 10.3390/rel3030710
Abstract: The Centrality of Religiosity Scale (CRS) is a measure of the centrality, importance or salience of religious meanings in personality that has been applied yet in more than 100 studies in sociology of religion, psychology of religion and religious studies in 25 countries with in total more than 100,000 participants. It measures the general intensities of five theoretical defined core dimensions of religiosity. The dimensions of public practice, private practice, religious experience, ideology and the intellectual dimensions can together be considered as representative for the total of religious live. From a psychological perspective, the five core-dimensions can be seen as channels or modes in which personal religious constructs are shaped and activated. The activation of religious constructs in personality can be regarded as a valid measure of the degree of religiosity of an individual. The CRS thus derives from the five dimensional measures a combined measure of the centrality of religiosity which is suitable also for interreligious studies. The paper presents the theoretical basis and rationale of its construction with different versions of the CRS in 20 languages with norm values for 21 countries. Furthermore, the paper presents versions of different extension and describes specific modifications that were developed for studies with Buddhists, Hindus and Muslims.
Su n, Zetti, Wüer - Namen im Umkreis der Oberwalliser Flurbew sserung
Bellwald, Werner,Würth, Stefan
Linguistik Online , 2006,
Abstract: An archaic dialect, ancient wooden houses, the special rye bread or the artificial irrigation channels (suones) - they all belong to the typical "sights" of the Valais that are widely known but little investigated. In our paper we record the names of waterways in the German-speaking Valais, above all we derive proper names and appellatives etymologically and look into their geografic and diachronic distribution from first documentary evidence back in the 13th century up to present-day oral recordings, from the language boundary near Siders to the Rhone glacier.Not claiming completeness and not wanting to collect all suones an onomastic explanatio of the most important names and appellatives is given which denote artificial waterways. Tools and work processes are listed and a typology and morphology of the names of the waterways is set up.
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