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Search Results: 1 - 10 of 297803 matches for " Seidel J "
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Individual Counseling To Private Physicians Concerning Their Prescription Habits. A German Experience
Seidel J
Revue Médicale de l'Assurance Maladie , 2002,
Abstract: In order counteract ever-increasing prescription costs over the last few years combined with the precarious financial state of the health insurance fund of the German Land , Mecklembourg-Pomerany, the minister of social affairs, the health insurance fund and the Union of physicians contracting with the Land came to an agreement. The aim was to contain costs while guaranteeing that prescriptions remained of the highest quality. In order to accomplish this goal, the concerned players developed a common program of counseling and information directed at improving the prescription habits of private physicians. Beforehand, a pharmacy data bank (PLATO) had to be developed, permitting an analysis of the many aspects of the pharmacy prescriptions reimbursed by the health insurance fund. The article presents the preliminary results of this counseling and information-sharing initiative.
Ramsey interferometry with oppositely detuned fields
D. Seidel,J. G. Muga
Physics , 2006, DOI: 10.1103/PhysRevA.75.023811
Abstract: We report a narrowing of the interference pattern obtained in an atomic Ramsey interferometer if the two separated fields have different frequency and their phase difference is controlled. The width of the Ramsey fringes depends inversely on the free flight time of ground state atoms before entering the first field region in addition to the time between the fields. The effect is stable also for atomic wavepackets with initial position and momentum distributions and for realistic mode functions.
Ramsey interferometry with ultracold atoms
D. Seidel,J. G. Muga
Physics , 2006, DOI: 10.1140/epjd/e2006-00205-1
Abstract: We examine the passage of ultracold two-level atoms through two separated laser fields for the nonresonant case. We show that implications of the atomic quantized motion change dramatically the behavior of the interference fringes compared to the semiclassical description of this optical Ramsey interferometer. Using two-channel recurrence relations we are able to express the double-laser scattering amplitudes by means of the single-laser ones and to give explicit analytical results. When considering slower and slower atoms, the transmission probability of the system changes considerably from an interference behavior to a regime where scattering resonances prevail. This may be understood in terms of different families of trajectories that dominate the overall transmission probability in the weak field or in the strong field limit.
Microlensing Neutron Stars
Dominik J. Schwarz,Dirk Seidel
Physics , 2002, DOI: 10.1051/0004-6361:20020530
Abstract: We investigate the chances that neutron stars act as the lense in a gravitational microlensing event towards the galactic bulge or a spiral arm. The observation of neutron stars by means of gravitational microlensing would allow the estimation of neutron star masses independently of the property of being a pulsar in a binary system. We estimate the contribution of neutron stars to the optical depth and the lensing rate based on two different models of the pulsar distribution in the galaxy. Since only a small fraction of all neutron stars are pulsars, it is unlikely to find a pulsar that acts as a microlense by chance. A position comparison of known radio pulsars with observed microlensing candidates towards the galactic bulge and spiral arms shows no candidate pair, which is consistent with the theoretical expectation. To improve the probability of microlensing a pulsar, we suggest to search for gravitational microlensing events of known nearby high proper motion pulsars. The pulsar PSR J1932+1059 is a good candidate for an astrometric detection of gravitational lensing.
Relation between quantum dwell times and flux-flux correlations
J. Munoz,D. Seidel,J. G. Muga
Physics , 2008, DOI: 10.1103/PhysRevA.79.012108
Abstract: We examine the connection between the dwell time of a quantum particle in a region of space and flux-flux correlations at the boundaries. It is shown that the first and second moments of a flux-flux correlation function which generalizes a previous proposal by Pollak and Miller [E. Pollak and W. H. Miller, Phys. Rev. Lett. {\bf 53}, 115 (1984)], agree with the corresponding moments of the dwell-time distribution, whereas the third and higher moments do not. We also discuss operational approaches and approximations to measure the flux-flux correlation function and thus the second moment of the dwell time, which is shown to be characteristically quantum, and larger than the corresponding classical moment even for freely moving particles.
Ex vitro acclimatization of Cattleya forbesii and Laelia purpurata seedlings in a selection of substrates
Seidel Júnior, Donato;Venturieri, Giorgini Augusto;
Acta Scientiarum. Agronomy , 2011, DOI: 10.4025/actasciagron.v33i1.3939
Abstract: four substrates were compared (peat, no. 2 gravel only, mixture of no. 2 gravel and peat at a 3:1 ratio, and xaxim) for use in ex vitro growth of cattleya forbesii and laelia purpurata - orquidacea. a substrate x species interaction was observed for the variables vigor and height, showing that each species has its own specificity for substrate. for c. forbesii, xaxim placed first in two of the four assessed parameters. next came the gravel:peat substrates and peat in the second position for two parameters and in third place for two. in last place was gravel, which was in fourth place for all four parameters assessed. for l. purpurata, the substrates with the greatest number of parameters in first and second positions were gravel:peat and peat, both with two first positions, one second and one third. next was xaxim, which had one second position, two third positions and one fourth. as the last came gravel, which had one second position and three fourth positions. xaxim was the best substrate for c. forbesii, but could be replaced, with a minor reduction in performance, by the no. 2 gravel:peat mixture. for l. purpurata, the best substrate was no. 2 gravel:peat mixture. the low effectiveness of the no. 2 gravel substrate when compared with no. 2 gravel:peat provides evidence of the importance of organic matter for these orchids.
Radon concentrations in karstic aquifers
M. Monnin,J-L. Seidel
Geofísica internacional , 2002,
Abstract: Time variations of radon-222 concentrations in the water of the Lamalou, France, karst aquifer have been measured. The measurements have been performed at the spring outlet of the aquifer as well as in boreholes drilled from the surface. Radon concentrations variations recorded in the main outlet and in a well located next to it are compared. The response to rainfall depends strongly on the season when rainfall occurs. During summer, a rain episode is followed by a radon response in the well but not at the spring. Furthermore, the decay of the radon signal obeys strictly the radioactive decay law. Accordingly, during summer the water of the aquifer barely moves horizontaly. On the contrary, during the rainy season, every rainfall induces a signal both in the well and at the spring reflecting a different mechanism and a mixing process of the water in the main outlet.
Pressure response of radon detecting devices placed at depth in aquifers
M. Monnin,J.L. Seidel
Geofísica internacional , 2002,
Abstract: Real-time in situ Rn measurements under water at different depths are often required. Pressure effects on electronic equipment can play a role on the sensor and on the geometry of the device. We discuss the sensitivity of such systems depending on depth/pressure variation and provide a correction factor curve. We show that Rn solubility in water can be investigated as a function of pressure.
Ex vitro acclimatization of Cattleya forbesii and Laelia purpurata seedlings in a selection of substrates = Aclimatiza o ex-vitro de mudas de Cattleya forbesii e Laelia purpurata em diferentes substratos.
Donato Seidel Júnior,Giorgini Augusto Venturieri
Acta Scientiarum : Agronomy , 2011,
Abstract: Four substrates were compared (peat, no. 2 gravel only, mixture of no. 2 gravel and peat at a 3:1 ratio, and xaxim) for use in ex vitro growth of Cattleya forbesii and Laelia purpurata - Orquidacea. A substrate x species interaction was observed for the variables vigor and height, showing that each species has its own specificity for substrate. For C. forbesii, xaxim placed first in two of the four assessed parameters. Next came the gravel:peat substrates and peat in the second position for two parameters and in third place for two. In last place was gravel, which was in fourth place for all four parameters assessed. For L. purpurata, the substrates with the greatest number of parameters in first and second positions were gravel:peat and peat, both with two first positions, one second and one third. Next was xaxim, which had one second position, two third positions and one fourth. As thelast came gravel, which had one second position and three fourth positions. Xaxim was the best substrate for C. forbesii, but could be replaced, with a minor reduction in performance, by the no. 2 gravel:peat mixture. For L. purpurata, the best substrate was no. 2 gravel:peat mixture. The low effectiveness of the no. 2 gravel substrate when compared with no. 2gravel:peat provides evidence of the importance of organic matter for these orchids. Quatro substratos (turfa, pedra brita no 2, mistura de turfa: pedrabrita no 2 na propor o 1:3 e xaxim) foram testados sobre o crescimento ex-vitro de Cattleya forbesii e Laelia purpurata – Orquidácea. Foi observada intera o significativa entre substrato xespécie para as variáveis vigor e altura, demonstrando que cada espécie tem sua especificidade para o substrato. Para a C. forbesii, o xaxim obteve duas primeiras posi es em todos os quatro parametros avaliados. Em seguida, vieram os substratos turfa:pedra brita no 2 e a turfa com dois parametros ocupando a segunda posi o e dois, a terceira. Por último a pedra brita no 2, que nos quatro parametros avaliados, ocupou sempre o último lugar. Para a L. purpurata os substratos com maior número de parametros nas primeira e segundaposi es foram a turfa:pedra brita no 2 e a turfa, ambos ocupando duas posi es em primeiro lugar, uma em segundo e uma em terceiro. Em seguida, teve-se o xaxim, que ocupou uma posi o em segundo lugar, dois em terceiro e um em quarto. Por último, tevese a pedra brita no 2, que ocupou uma posi o em segundo lugar e três em quarto. Xaxim foio melhor substrato para C. forbesii, mas que poderá ser substituído, com pequena desvantagem, pela mistura turfa:pedra bri
The role of diabetes mellitus in localized and metastatic renal cell carcinoma  [PDF]
Sandra Steffens, Christoph von Klot, Hendrik Egggers, Christoph Seidel, Gerd Wegener, Mark Schrader, Markus A. Kuczyk, Andres J. Schrader
Journal of Diabetes Mellitus (JDM) , 2011, DOI: 10.4236/jdm.2011.14014
Abstract: Introduction & Objectives: Until recently, the incidence of renal cell carcinoma (RCC) has been increasing worldwide, mainly in western countries, at a rate between 2% and 4% per year. However, the reason for this dramatic increase in number has not been fully understood. Diabetes mellitus (DM) is a known risk factor for RCC, but the impact of DM on the prognosis of RCC is unclear. In the present study, we investigated the potential influence of DM on clinicopathological features of localized and metastatic RCC. Material & Methods: We evaluated 863 patients with primary RCC who had undergone renal surgery between 1991 and 2005 in the University Hospital Hannover; the mean follow-up was 58 months. To test the association of DM with survival end-points, Kaplan-Meier Method and Cox multivariable logistic regression models were applied. Results: In total, we identified 123 diabetic patients who suffered from RCC, 9 patients with diabetes type 1 and 114 with type 2. Patients with DM type 2 presented significantly more often with pT1a tumours at diagnosis (40.0 vs. 31.7%, p = 0.02), had less frequently high grade cancer (G3/4; 10.3 vs. 16.2%, p = 0.03), were older (median, 65.3 vs. 61.6 years; p < 0.001), and had a higher BMI at diagnosis (median, 27.6 vs. 25.8, p < 0.001). However, there was no difference between diabetic and non-diabetic patients concerning sex, histological subtype, lymphatic and distant metastasis. In addition, there was no discrepancy in 5-year cancer specific survival between both groups (62.2 vs. 64.9% for patients without and with DM type 2, respectively). Applying multivariable analysis, unlike age, tumour stage, grade and N/M status, diabetes was not identified as a significant independent prognostic factor. Conclusions: To our knowledge this is the first study to show that even though diabetes is a risk factor for RCC it does not seem to influence its prognoses even though it might be diagnosed earlier in diabetic patients.
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