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Search Results: 1 - 10 of 189930 matches for " G. Ristow "
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Density Patterns in Granular Media
G. Ristow,H. J. Herrmann
Physics , 1993,
Abstract: Recent experiments by Baxter et al. showed the existence of density waves in granular material flowing out of a hopper. We show, using Molecular Dynamics Simulations, that this effect is a consequence of static friction and find that these density fluctuations follow a $1/f$ spectrum. The effect is enhanced when the opening angle of the hopper decreases.
On Hydrodynamic Diffusion and Velocity Fluctuations in Two--Dimensional Simulations of Sedimentation
W. Kalthoff,S. Schwarzer,G. H. Ristow,H. J. Herrmann
Physics , 1995,
Abstract: We present a numerical method to deal efficiently with large numbers of particles in incompressible fluids. The interactions between particles and fluid are taken into account by a physically motivated ansatz based on locally defined drag forces. We demonstrate the validity of our approach by performing numerical simulations of sedimenting non-Brownian spheres in two spatial dimensions and compare our results with experiments. Our method reproduces essential aspects of the experimental findings, in particular the strong anisotropy of the hydrodynamic bulk self-diffusivities.
Tolerance and Sensitivity in the Fuse Network
G. George Batrouni,Alex Hansen,Gerald H. Ristow
Physics , 1993, DOI: 10.1088/0305-4470/27/4/030
Abstract: We show that depending on the disorder, a small noise added to the threshold distribution of the fuse network may or may not completely change the subsequent breakdown process. When the threshold distribution has a lower cutoff at a finite value and a power law dependence towards large thresholds with an exponent which is less than $0.16\pm0.03$, the network is not sensitive to the added noise, otherwise it is. The transition between sensitivity or not appears to be second order, and is related to a localization-delocalization transition earlier observed in such systems.
Formas de explora??o do rebanho caprino no Estado do Rio de Janeiro, 1998/2000
Souza, G.N.;Moreira, E.C.;Ristow, P.;Fráguas, S.;Lilenbaum, W.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2002, DOI: 10.1590/S0102-09352002000200015
Abstract: aiming to understanding the goat industry in the state of rio de janeiro, from 1998-2000, this study was carried out in 48 goat farms, 72.9% of which with an area of less than eight hectares. also, 62.5% of the farms had irregular topography, and 69% of them kept saanen breed in a confined system (93.7%). animals were housed between 16 to 24 hours/day in suspended wooden stalls, and 83.3% were dairy goats.
Improvement of HbA1c and stable weight loss 2 years after an outpatient treatment and teaching program for patients with type 2 diabetes without insulin therapy based on urine glucose self-monitoring
Müller N, Stengel D, Kloos C, Ristow M, Wolf G, Müller UA
International Journal of General Medicine , 2012, DOI: http://dx.doi.org/10.2147/IJGM.S28505
Abstract: ovement of HbA1c and stable weight loss 2 years after an outpatient treatment and teaching program for patients with type 2 diabetes without insulin therapy based on urine glucose self-monitoring Original Research (2360) Total Article Views Authors: Müller N, Stengel D, Kloos C, Ristow M, Wolf G, Müller UA Published Date March 2012 Volume 2012:5 Pages 241 - 247 DOI: http://dx.doi.org/10.2147/IJGM.S28505 Received: 22 November 2011 Accepted: 15 December 2011 Published: 13 March 2012 Nicolle Müller1, Daniela Stengel2, Christof Kloos1, Michael Ristow2, Gunter Wolf1, Ulrich A Müller1 1University Hospital of Jena, Department of Internal Medicine III, Jena, Germany; 2Friedrich-Schiller-University Jena, Institute of Nutrition, Department of Human Nutrition, Jena, Germany Objective: Long-term outcomes after participation in a structured diabetes treatment and teaching program (DTTP) for patients with diabetes without insulin use, primarily based upon postprandial urine glucose self-monitoring (UGSM). Methods: A total of 126 patients took part in the DTTP in a university outpatient department in 2004–2005. We re-evaluated 119 (94.4%) at baseline and at 6 months, 12 months, and 24 months. Hemoglobin A1c (HbA1c) was DCCT adjusted. Results: HbA1c decreased significantly 6 months after education from 7.33% (±1.59%) to 6.89% (±0.98%; P = 0.001 versus baseline) and was maintained for up to 12 months (7.02% ± 1.07%; P = 0.017 versus baseline) as well as up to 24 months (6.96% ± 1.06%; P = 0.005 versus baseline). Weight decreased from 92.5 kg at baseline to 90.3 kg at 24 months (P = 0.014). A total of 36.5% of patients not on insulin therapy preferred UGSM, whereas 23.5% preferred blood glucose monitoring, at 24 months. Glucose control was similar in both groups at 24 months (HbA1c UGSM 7.03 versus blood glucose monitoring 6.97%; P = 0.807). Conclusion: Participation in the DTTP resulted in long-term behavior modification. HbA1c of patients without insulin met the target 24 months after the DTTP, irrespective of the type of glucose self-monitoring.
Formas de explora o do rebanho caprino no Estado do Rio de Janeiro, 1998/2000
Souza G.N.,Moreira E.C.,Ristow P.,Fráguas S.
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2002,
Abstract: Aiming to understanding the goat industry in the State of Rio de Janeiro, from 1998-2000, this study was carried out in 48 goat farms, 72.9% of which with an area of less than eight hectares. Also, 62.5% of the farms had irregular topography, and 69% of them kept Saanen breed in a confined system (93.7%). Animals were housed between 16 to 24 hours/day in suspended wooden stalls, and 83.3% were dairy goats.
Lateral migration of a 2D vesicle in unbounded Poiseuille flow
B. Kaoui,G. H. Ristow,I. Cantat,C. Misbah,W. Zimmermann
Physics , 2007, DOI: 10.1103/PhysRevE.77.021903
Abstract: The migration of a suspended vesicle in an unbounded Poiseuille flow is investigated numerically in the low Reynolds number limit. We consider the situation without viscosity contrast between the interior of the vesicle and the exterior. Using the boundary integral method we solve the corresponding hydrodynamic flow equations and track explicitly the vesicle dynamics in two dimensions. We find that the interplay between the nonlinear character of the Poiseuille flow and the vesicle deformation causes a cross-streamline migration of vesicles towards the center of the Poiseuille flow. This is in a marked contrast with a result [L.G. Leal, Ann. Rev. Fluid Mech. 12, 435(1980)]according to which the droplet moves away from the center (provided there is no viscosity contrast between the internal and the external fluids). The migration velocity is found to increase with the local capillary number (defined by the time scale of the vesicle relaxation towards its equilibrium shape times the local shear rate), but reaches a plateau above a certain value of the capillary number. This plateau value increases with the curvature of the parabolic flow profile. We present scaling laws for the migration velocity.
Antidepressants of the Serotonin-Antagonist Type Increase Body Fat and Decrease Lifespan of Adult Caenorhabditis elegans
Kim Zarse, Michael Ristow
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0004062
Abstract: It was recently suggested that specific antidepressants of the serotonin-antagonist type, namely mianserin and methiothepin, may exert anti-aging properties and specifically extend lifespan of the nematode C.elegans by causing a state of perceived calorie restriction (Petrascheck M, Ye X, Buck LB: An antidepressant that extends lifespan in adult Caenorhabditis elegans; Nature, Nov 22, 2007;450(7169):553–6, PMID 18033297). Using the same model organism, we instead observe a reduction of life expectancy when employing the commonly used, standardized agar-based solid-phase assay while applying the same or lower concentrations of the same antidepressants. Consistent with a well-known side-effect of these compounds in humans, antidepressants not only reduced lifespan but also increased body fat accumulation in C. elegans reflecting the mammalian phenotype. Taken together and in conflict with previously published findings, we find that antidepressants of the serotonin-antagonist type not only promote obesity, but also decrease nematode lifespan.
Modelling of a falling sludge bed reactor using AQUASIM
NE Ristow, GS Hansford
Water SA , 2001,
Abstract: The falling sludge bed reactor (FSBR) allows for increased solids retention time, resulting in greater substrate conversion for all particulate degradation and biological reactions. The purpose of the FSBR is to hydrolyse primary settled sewage (PSS). Soluble products are then used for the biological treatment of acid mine drainage. A mathematical model has been developed that describes the anaerobic digestion of PSS and biological sulphate reduction in the FSBR. The hydrodynamic processes taking place in the FSBR have been simulated using a system of mixed reactors connected by water flow and mass flux streams. Trends obtained from varying the hydraulic retention time, the sludge recycle ratio, and the feed COD: SO4 2- ratio allow for identification of the critical biological processes taking place in the FSBR, as well as the influence of the operating parameters. Areas where there is a lack of understanding in the mechanism and kinetics have been identified, and these include the influence of sulphate reduction on the hydrolysis of particulate organic matter, as well as the mathematical influence of sulphide inhibition on the various biological groups. A sensitivity analysis shows that hydrolysis is the rate-limiting process, while sulphide inhibition is of importance when sulphate conversion increases. WaterSA Vol.27(4) 2001: 445-454
O vai-e-vem no tratamento da doen a carotídea The ups and downs in the treatment of carotid disease
Arno von Ristow
Jornal Vascular Brasileiro , 2007, DOI: 10.1590/s1677-54492007000400001
Abstract:
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