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Institution

Wrocław University of Technology

EducationWrocław, Poland
About: Wrocław University of Technology is a education organization based out in Wrocław, Poland. It is known for research contribution in the topics: Laser & Fuzzy logic. The organization has 13115 authors who have published 31279 publications receiving 338694 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, it was found that alkenylhydroquinone ethers can be demethylated with argentic oxide or ceric ammonium nitrate in the presence of 2,4,6-pyridinetricarboxylic acid as a catalyst and afforded ubiquinone-2, menaquinone-1 and their analogs in yields of 53 to 89%.

121 citations

Journal ArticleDOI
TL;DR: It is indicated that desensitization rate is the fastest ligand-independent transition in the GABAAR gating scheme, and the pH dependencies of amplitudes were almost opposite, which resulted from a much shorter receptor exposure to agonist in the case of mIPSCs.
Abstract: Protons are the most ubiquitous and very potent modulators of the biological systems. Hydrogen ions are known to modulate GABAA receptors (GABAARs), but the mechanism whereby these ions affect IPSCs and the gating of GABAARs is not clear. In the present study we examined the effect of protons on miniature IPSCs (mIPSCs) and found that hydrogen ions strongly affected both their amplitude and time course. To explore the underlying mechanisms with resolution adequate to the time scale of synaptic transmission, we recorded current responses to ultrafast GABA applications at various pH. These experiments revealed that the major effect of protons on GABAAR gating is a strong enhancement of desensitization and binding rates at increasing pH. This analysis also indicated that desensitization rate is the fastest ligand-independent transition in the GABAAR gating scheme. Although proton effects on the time course of mIPSCs and current responses to saturating [GABA] were similar, the pH dependencies of amplitudes were almost opposite. Our quantitative analysis, based on model simulations, indicated that this difference resulted from a much shorter receptor exposure to agonist in the case of mIPSCs. Modeling of IPSCs as current responses to brief exponentially decaying GABA applications was sufficient to reproduce correctly the pH dependence of mIPSCs, and optimal fit was obtained for peak [GABA] of 1.5-3 mm and a clearance time constant of 0.075-0.125 msec. Our analysis indicates that, for these parameters of GABA transient, in control conditions (pH 7.2) mIPSCs are not saturated.

121 citations

Journal ArticleDOI
TL;DR: In this paper, a two-terminal impedance-based fault-location algorithm is presented, which takes into account the distributed parameter line model and utilizes unsynchronized measurements of voltages and currents from two ends of a line and is formulated in terms of the fundamental frequency phasors of symmetrical components of the measured signals.
Abstract: This paper presents a new two-terminal impedance-based fault-location algorithm, which takes into account the distributed parameter line model. The algorithm utilizes unsynchronized measurements of voltages and currents from two ends of a line and is formulated in terms of the fundamental frequency phasors of symmetrical components of the measured signals. First, an analytical synchronization of the unsynchronized measurements is performed with use of the determined synchronization operator. Then, the distance to fault is calculated as for the synchronized measurements. Simultaneous usage of two kinds of symmetrical components for determining the synchronization operator makes that the calculations are simple, noniterative, and at the same time highly accurate. The developed fault-location algorithm has been thoroughly tested using signals of Alternate Transients Program-Electromagnetic Transients Program versatile simulations of faults on a transmission line. The presented evaluation shows the validity of the developed fault-location algorithm and its high accuracy.

121 citations

Journal ArticleDOI
TL;DR: A collection of regular and singular Jacobian inverse kinematics algorithms that drive the end effector to a desirable position and orientation in the taskspace are presented.
Abstract: By a mobile manipulator we mean a robotic system composed of a non-holonomic mobile platform and a holonomic manipulator fixed to the platform. A taskspace of the mobile manipulator includes positions and orientations of its end effector relative to an inertial coordinate frame. The kinematics of a mobile manipulator are represented by a driftless control system with outputs. Admissible control functions of the platform along with joint positions of the manipulator constitute the endogenous configuration space. Endogenous configurations have a meaning of controls. A map from the endogenous configuration space into the taskspace is referred to as the instantaneous kinematics of the mobile manipulator. Within this framework, the inverse kinematic problem for a mobile manipulator amounts to defining an endogenous configuration that drives the end effector to a desirable position and orientation in the taskspace. Exploiting the analogy between stationary and mobile manipulators we present in the paper a colle...

121 citations

Journal ArticleDOI
TL;DR: In this paper, the scale invariant Harnack inequality and regularity properties for harmonic functions with respect to an isotropic unimodal Levy process with the characteristic exponent ψ satisfying some scaling condition were proved.
Abstract: We prove the scale invariant Harnack inequality and regularity properties for harmonic functions with respect to an isotropic unimodal Levy process with the characteristic exponent ψ satisfying some scaling condition. We derive sharp estimates of the potential measure and capacity of balls, and further, under the assumption that ψ satisfies the lower scaling condition, sharp estimates of the potential kernel of the underlying process. This allows us to establish the Krylov–Safonov type estimate, which is the key ingredient in the approach of Bass and Levin, that we follow.

121 citations


Authors

Showing all 13239 results

NameH-indexPapersCitations
Krzysztof Palczewski11463146909
Claude B. Sirlin9847533456
Marek Czosnyka8874729117
Alfred Forchel85135834771
Jerzy Leszczynski7899327231
Kim R. Dunbar7447020262
Massimo Olivucci6729214880
Nitesh V. Chawla6138841365
Edward R. T. Tiekink60196721052
Bobby G. Sumpter6061923583
Wieslaw Krolikowski5950412836
Pappannan Thiyagarajan5924510650
Marek Samoc5840111171
Lutz Mädler5823227800
Rafał Weron5828512058
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202372
2022231
20211,579
20201,769
20191,753
20181,963