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Search Results: 1 - 10 of 208458 matches for " L. Kogler "
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Lane formation in a system of dipolar microswimmers
Florian Kogler,Sabine H. L. Klapp
Physics , 2015, DOI: 10.1209/0295-5075/110/10004
Abstract: Using Brownian Dynamics (BD) simulations we investigate the non-equilibrium structure formation of a two-dimensional (2D) binary system of dipolar colloids propelling in opposite directions. Despite of a pronounced tendency for chain formation, the system displays a transition towards a laned state reminiscent of lane formation in systems with isotropic repulsive interactions. However, the anisotropic dipolar interactions induce novel features: First, the lanes have themselves a complex internal structure characterized by chains or clusters. Second, laning occurs only in a window of interaction strengths. We interprete our findings by a phase separation process and simple force balance arguments.
Measurement of Multijet Production in DIS and Determination of the Strong Coupling Constant
Roman Kogler
Physics , 2011,
Abstract: Inclusive jet, dijet and trijet differential cross sections have been measured in neutral current deep-inelastic scattering for exchanged boson virtualities $150 < Q^2 < 15000$ GeV$^2$ with the H1 detector at HERA using an integrated luminosity of 351 pb$^{-1}}$. The multijet cross sections are presented as a function of $Q^2$, the transverse momentum of the jet $P_T$ (the mean transverse momentum for dijets and trijets) and the proton's longitudinal momentum fraction of the parton participating in the hard interaction $\xi$. The cross sections are compared to perturbative QCD calculations at next-to-leading order and the value of the strong coupling $\alpha_s(M_Z)$ is determined.
Jet Production at Low and High $Q^2$ and Determination of the Strong Coupling $α_s$ at H1
Roman Kogler
Physics , 2010,
Abstract: Two recent measurements of inclusive jet, 2-jet and 3-jet cross sections in deep-inelastic $ep$ scattering from the H1 collaboration are presented. The measurements are performed at low $5
Precision jet measurements at HERA and determination of α_s
Roman Kogler
Physics , 2011, DOI: 10.1016/j.nuclphysbps.2012.03.009
Abstract: The status is reviewed of recent high precision measurements of inclusive-jet, dijet and trijet production in deep-inelastic scattering and photoproduction by the HERA experiments H1 and ZEUS. The measurements are in good agreement with perturbative QCD calculations at next-to-leading order and are used for the extraction of the value of the strong coupling at the mass of the Z boson, \alpha_s(M_Z). The methods and results of the QCD analyses are presented and a summary of the values of \alpha_s(M_Z) from recent jet measurements at HERA is given.
Generic model for tunable colloidal aggregation in multidirectional fields
Florian Kogler,Orlin D. Velev,Carol K. Hall,Sabine H. L. Klapp
Physics , 2015,
Abstract: Based on Brownian Dynamics computer simulations in two dimensions we investigate aggregation scenarios of colloidal particles with directional interactions induced by multiple external fields. To this end we propose a model which allows continuous change in the particle interactions from point-dipole-like to patchy-like (with four patches). We show that, as a result of this change, the non-equilibrium aggregation occurring at low densities and temperatures transforms from conventional diffusion-limited cluster aggregation (DLCA) to slippery DLCA involving rotating bonds; this is accompanied by a pronounced change of the underlying lattice structure of the aggregates from square-like to hexagonal ordering. Increasing the temperature we find a transformation to a fluid phase, consistent with results of a simple mean-field density functional theory.
Advantage of spontaneous breathing in patients with respiratory failure
Vi?nja Majeri? Kogler
Signa Vitae , 2009,
Abstract: The fact that different modalities of mechanical ventilation are associated with a number of serious side effects and risks and can influence the clinical outcome of patients, the various modes of mechanical ventilation have, over the past ten years, been the subject of a wide variety of scientific studies. Many of these modalities are designed for partial ventilatory support, which might reflect the complexity of the issue of patient's ventilator interactions when spontaneous breathing activity is present, compared to controlled mechanical ventilation. Spontaneous breathing modes during mechanical ventilation may integrate intrinsic feedback mechanisms that should help prevent ventilator- induced lung injury and improve synchrony between the ventilator and the patient's demand. The improvements in pulmonary gas exchange, systemic blood flow, and oxygen supply to the tissue that have been observed when spontaneous breathing has been maintained during mechanical ventilation are reflected in the clinical improvement in the patient' s condition. It is the aim of this article to review the effects of preserved spontaneous breathing activity during mechanical ventilation in patients with acute respiratory failure.
Drip and Mate Operations Acting in Test Tube Systems and Tissue-like P systems
Rudolf Freund,Marian Kogler
Electronic Proceedings in Theoretical Computer Science , 2009, DOI: 10.4204/eptcs.11.8
Abstract: The operations drip and mate considered in (mem)brane computing resemble the operations cut and recombination well known from DNA computing. We here consider sets of vesicles with multisets of objects on their outside membrane interacting by drip and mate in two different setups: in test tube systems, the vesicles may pass from one tube to another one provided they fulfill specific constraints; in tissue-like P systems, the vesicles are immediately passed to specified cells after having undergone a drip or mate operation. In both variants, computational completeness can be obtained, yet with different constraints for the drip and mate operations.
Search for heavy resonances decaying to top quarks
Roman Kogler,for the CMS Collaboration
Physics , 2013,
Abstract: In many models of physics beyond the Standard Model the coupling of new states to third generation quarks is enhanced. A review is presented of searches by the CMS collaboration for heavy particles decaying to final states involving top quarks. This includes searches for heavy gauge bosons and excited states. Several final states originating from the top quark decays are considered and the event reconstruction is optimised accordingly. The analyses presented use data collected with the CMS experiment during the year 2012 at the LHC, in proton-proton collisions at a centre-of-mass energy of 8 TeV.
The global electroweak Standard Model fit after the Higgs discovery
Max Baak,Roman Kogler
Physics , 2013,
Abstract: We present an update of the global Standard Model (SM) fit to electroweak precision data under the assumption that the new particle discovered at the LHC is the SM Higgs boson. In this scenario all parameters entering the calculations of electroweak precision observalbes are known, allowing, for the first time, to over-constrain the SM at the electroweak scale and assert its validity. Within the SM the W boson mass and the effective weak mixing angle can be accurately predicted from the global fit. The results are compatible with, and exceed in precision, the direct measurements. An updated determination of the S, T and U parameters, which parametrize the oblique vacuum corrections, is given. The obtained values show good consistency with the SM expectation and no direct signs of new physics are seen. We conclude with an outlook to the global electroweak fit for a future e+e- collider.
Analgesia and sedation in hemodynamic unstable patient
Signa Vitae , 2008,
Abstract: Pain, restlessness, tension and delirium are almost always encountered while treating hemodynamic unstable critical patients in the intensive care units. Usually in critical patients, the evaluation of the nature and pain intensity (VAS scale) are often impossible. During the last 10 years intense nociceptor somatic and visceral post operative pain is believed to be the most crucial factor in the development of endocrine and neurohumoral disorders, within the postoperative period. Chronic post operative pain is appearing often (30%-40%), with great influence on the quality of patients life. The modern principal in treating acute pain is the use of multimodal balanced analgesia approach, which is individually catered with drug and dose for each patient. Modern systemic analgesia is understood to be the continuous use of opiates or opioids, titrated towards pain intensity, with a minimum number of complications even in hemodynamic unstable patients. The combined use of opioids with NSAID and paracetamol reduces the overall dosage of opioids by 20% - 30% and therefore significantly contributes to hemodynamic and respiratory stability. Effective and safe epidural analgesia in hemodynamic unstable patients can be optimized by simultaneous use of various drugs with different mechanisms of action (local anaesthetic, opioid, adrenalin, ketamin). The accepted concept of analgosedation in critical patients is understood to be the use of short acting drugs (fentanyl, sufentanil, remifentanil, midazolam, propofol) in which drug dosage can be quickly adjusted in respect to the present clinical state of the patient.
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