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Search Results: 1 - 10 of 325303 matches for " S. Jespersen "
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Small-World Networks: Links with long-tailed distributions
S. Jespersen,A. Blumen
Physics , 2000, DOI: 10.1103/PhysRevE.62.6270
Abstract: Small-world networks (SWN), obtained by randomly adding to a regular structure additional links (AL), are of current interest. In this article we explore (based on physical models) a new variant of SWN, in which the probability of realizing an AL depends on the chemical distance between the connected sites. We assume a power-law probability distribution and study random walkers on the network, focussing especially on their probability of being at the origin. We connect the results to L\'evy Flights, which follow from a mean field variant of our model.
Small-World Rouse Networks as models of cross-linked polymers
S. Jespersen,I. M. Sokolov,A. Blumen
Physics , 2000, DOI: 10.1063/1.1312277
Abstract: We use the recently introduced small-world networks (SWN) to model cross-linked polymers, as an extension of the linear Rouse-chain. We study the SWN-dynamics under the influence of external forces. Our focus is on the structurally and thermally averaged SWN stretching, which we determine both numerically and analytically using a psudo-gap ansatz for the SWN-density of states. The SWN stretching is related to the probability of a random-walker to return to its origin on the SWN. We compare our results to the corresponding ones for Cayley trees.
Relaxation Properties of Small-World Networks
S. Jespersen,I. M. Sokolov,A. Blumen
Physics , 2000, DOI: 10.1103/PhysRevE.62.4405
Abstract: Recently, Watts and Strogatz introduced the so-called small-world networks in order to describe systems which combine simultaneously properties of regular and of random lattices. In this work we study diffusion processes defined on such structures by considering explicitly the probability for a random walker to be present at the origin. The results are intermediate between the corresponding ones for fractals and for Cayley trees.
Polymer dynamics in time-dependent Matheron-de Marsily flows: An exactly solvable model
S. Jespersen,G. Oshanin,A. Blumen
Physics , 2000, DOI: 10.1103/PhysRevE.63.011801
Abstract: We introduce a new model of random layered media, extending the Matheron-de Marsily model: Here we allow for the flows to change in time. For such layered structures, we solve exactly the equations of motion for single particles, and also for polymers modelled as Rouse chains. The results show a rich variety of dynamical patterns.
A Coky Man
Per Jespersen
Analytic Teaching and Philosophical Praxis , 2000,
Abstract: It is a summer evening at the beach - mild and without any wind. The surface of the sea is like a mirror, in which you can see the clouds drifting for an invisible wind, and a sun setting behind the horizon.I walk here with a child I know very well - we love to take a trip to this beach - not only because of the beach, but also because of the talks we have here. This very place has grown into a sacred place for us, because here we can discuss things, we cannot discuss anywhere else - strangely enough - but we do love it. We can walkhere for hours and find ourselves disturbed when other people suddenly turn up. They do not disturb us - theydisturb the deep dialogue we both love.
Redemptional Pedagogics
Per Jespersen
Analytic Teaching and Philosophical Praxis , 2000,
Abstract: Our society is no longer based on family life. Many families are split up, even in the nuclear family, because every member of the family lives his or her own life: you take your meal alone, everybodyhas his or her own room with a tv set or a computer, and the children spend much of their time in their own room, playing computer games or Nintendo.But of course you meet sometimes, but not always during the meals. Especially the main meals with everybody sitting around the table in the kitchen was a meeting, where you could tell about things you had experienced during the day. You could exchange opinions and get a new perspective to your experiences and thoughts through the common dialogue. Nowadays people do not give themselves time to put their experiences into words, and the regressed experiences therefore are not put into perspective together with other human beings, and you do not get the family members’ opinions on important things that have happened to you.Superficiality is there - all over the room - because there is only time to talk about the weather and the crazy neighbor, who has a crazy dog, that barks crazily all day. You do not go deep into anything: either you skate over the problems without touching the water under the ice, or you conceal everything. But as the meaning of Life is the opposite of superficiality, this meaning and intention of Life can feel so painfully lonesome: unexpressed - unexperienced on a deeper level - pent-up. Then, the soul freezes:the deepest of our mind shivers by cold and pent-upness.The times we live in are characterized by freezing souls - a spiritual, coldshivering nakedness, for which we have to pay a high price, if we do not try to solve the problem. The soulfreezing human being- is it not terrible?
Clinical features and predictors of mortality in admitted patients with community- and hospital-acquired legionellosis: A Danish historical cohort study
Sanne Jespersen, Ole S S?gaard, Henrik C Sch?nheyder, Michael J Fine, Lars ?stergaard
BMC Infectious Diseases , 2010, DOI: 10.1186/1471-2334-10-124
Abstract: We identified hospitalized cases of legionellosis in 4 Danish counties from January 1995 to December 2005 using the Danish national surveillance system and databases at departments of clinical microbiology. Clinical and laboratory data were retrieved from medical records; vital status was obtained from the Danish Civil Registration System. We calculated 30- and 90-day case fatality rates and identified independent predictors of mortality using logistic regression analyses.We included 272 cases of CAL and 60 cases of HAL. Signs and symptoms of HAL were less pronounced than for CAL and time from in-hospital symptoms to legionellosis diagnosis was shorter for CAL than for HAL (5.5 days vs. 12 days p < 0.001). Thirty-day case fatality was 12.9% for CAL and 33.3% for HAL; similarly 90-day case fatalities in the two groups were 15.8% and 55.0%, respectively. In a logistic regression analysis (excluding symptoms and laboratory tests) age >65 years (OR = 2.6, 95% CI: 1.1-5.9) and Charlson comorbidty index ≥2 (OR = 2.7, 95% CI: 1.1-6.5) were associated with an increased risk of death in CAL. We identified no statistically significant predictors of 30-day mortality in HAL.Signs and symptoms were less pronounced in HAL compared to CAL. Conversely, 30-day case fatality was almost 3 times higher. Clinical awareness is important for the timely diagnosis and treatment especially of HAL. There is a need for further studies of prognostic factors in order to improve the therapeutic approach to legionellosis and potentially reduce mortality.Legionellosis is caused by exposure to the small intracellular gram-negative bacterium Legionella from water sources in the indoor or outdoor environment [1]. Two to fifteen percent of all hospitalizations for community-acquired pneumonias in Europe and North America are caused by Legionella and recent studies suggest that rates of legionellosis may be increasing [2]. The optimal antibiotic treatment of legionellosis has never been investigated in
Genotypic characterization and safety assessment of lactic acid bacteria from indigenous African fermented food products
David B Adimpong, Dennis S Nielsen, Kim I S?rensen, Patrick MF Derkx, Lene Jespersen
BMC Microbiology , 2012, DOI: 10.1186/1471-2180-12-75
Abstract: Using molecular biology based methods and selected phenotypic tests such as catalase reaction, CO2 production from glucose, colonies and cells morphology, the isolates were identified as Lactobacillus delbrueckii, Lactobacillus fermentum, Lactobacillus ghanensis, Lactobacillus plantarum, Lactobacillus salivarius, Leuconostoc pseudomesenteroides, Pediococcus acidilactici, Pediococcus pentosaceus and Weissella confusa. The bacteria were susceptible to ampicillin, chloramphenicol, clindamycin and erythromycin but resistant to vancomycin, kanamycin and streptomycin. Variable sensitivity profiles to tetracycline and gentamicin was observed among the isolates with Lb. plantarum, Lb. salivarius, W. confusa (except strain SK9-5) and Lb. fermentum strains being susceptible to tetracycline whereas Pediococcus strains and Lb. ghanensis strains were resistant. For gentamicin, Leuc. pseudomesenteroides, Lb. ghanensis and Ped. acidilactici strains were resistant to 64?mg/L whereas some W. confusa and Lb. plantarum strains had a MIC value of 16?mg/L and 32?mg/L respectively. No β-haemolytic activity was observed, however, α-haemolytic activity was observed in 27% (9) of the strains comprising Lb. salivarius (6), W. confusa (2) and Lb. delbrueckii (1) isolates.The resistance to kanamycin and vancomycin is probably an intrinsic feature since similar observations were reported in the literature for LAB. Low prevalence of pathogenicity indicator traits were observed among the isolates especially with the presence of poor haemolytic activities and they could therefore be considered as interesting candidates for selection of starter cultures or probiotics for different applications.
Nonequilibrium Cotunneling through a Three-Level Quantum Dot
S. Schmaus,V. Koerting,J. Paaske,T. S. Jespersen,J. Nyg? rd,P. W?lfle
Physics , 2008, DOI: 10.1103/PhysRevB.79.045105
Abstract: We calculate the nonlinear cotunneling conductance through a quantum dot with 3 electrons occupying the three highest lying energy levels. Starting from a 3-orbital Anderson model, we apply a generalized Schrieffer-Wolff transformation to derive an effective Kondo model for the system. Within this model we calculate the nonequilibrium occupation numbers and the corresponding cotunneling current to leading order in the exchange couplings. We identify the inelastic cotunneling thresholds and their splittings with applied magnetic field, and make a qualitative comparison to recent experimental data on carbon nanotube and InAs quantum-wire quantum dots. Further predictions of the model like cascade resonances and a magnetic-field dependence of the orbital level splitting are not yet observed but within reach of recent experimental work on carbon nanotube and InAs nanowire quantum dots.
One-year mortality among Danish intensive care patients with acute kidney injury: a cohort study
Henrik Gammelager, Christian Christiansen, Martin Johansen, Else T?nnesen, Bente Jespersen, Henrik S?rensen
Critical Care , 2012, DOI: 10.1186/cc11420
Abstract: We identified all adults admitted to any ICU in Northern Denmark (approximately 1.15 million inhabitants) from 2005 through 2010 using population-based medical registries. AKI was defined at ICU admission based on the risk, injury, failure, loss of kidney function, and end-stage kidney disease (RIFLE) classification, using plasma creatinine changes. We included four severity levels: AKI-risk, AKI-injury, AKI-failure, and without AKI. We estimated cumulative mortality by the Kaplan-Meier method and hazard ratios (HRs) using a Cox model adjusted for potential confounders. We computed estimates for all ICU patients and for subgroups with different comorbidity levels, chronic kidney disease status, surgical status, primary hospital diagnosis, and treatment with mechanical ventilation or with inotropes/vasopressors.We identified 30,762 ICU patients, of which 4,793 (15.6%) had AKI at ICU admission. Thirty-day mortality was 35.5% for the AKI-risk group, 44.2% for the AKI-injury group, and 41.0% for the AKI-failure group, compared with 12.8% for patients without AKI. The corresponding adjusted HRs were 1.96 (95% confidence interval (CI) 1.80-2.13), 2.60 (95% CI 2.38 to 2.85) and 2.41 (95% CI 2.21 to 2.64), compared to patients without AKI. Among patients surviving 30 days (n = 25,539), 31- to 365 day mortality was 20.5% for the AKI-risk group, 23.8% for the AKI-injury group, and 23.2% for the AKI-failure group, compared with 10.7% for patients without AKI, corresponding to adjusted HRs of 1.33 (95% CI 1.17 to 1.51), 1.60 (95% CI 1.37 to1.87), and 1.64 (95% CI 1.42 to 1.90), respectively. The association between AKI and 30-day mortality was evident in subgroups of the ICU population, with associations persisting in most subgroups during the 31- to 365-day follow-up period, although to a lesser extent than for the 30-day period.AKI at ICU admission is an important prognostic factor for mortality throughout the subsequent year.Acute Kidney Injury (AKI) is defined as an abrupt
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