Search results for: A. Sikorski

Items from 1 to 20 out of 168 results

article

Assessing predictors of futility in patients receiving massive transfusions

Brian D. Lo, Kevin R. Merkel, James L. Dougherty, Tymoteusz J. Kajstura, more

Transfusion > 61 > 7 > 2082 - 2089

Background Massive transfusions are associated with a high mortality rate, but there is little evidence indicating when such efforts are futile. The purpose of this study was to identify clinical variables that could be used as futility indicators in massively transfused patients. Methods We retrospectively analyzed 138 adult surgical patients at our institution receiving a massive transfusion...

article

Rare case of presence of nematodes Dirofilaria repens in apleural cavity of a dog

A.W. Demiaszkiewicz, J. Lachowicz, A. Sikorski, T. Hutsch, more

Annals of Parasitology > 2021 > 67 > 1

article

Computer Simulation of the Dynamic Behavior of Double Polymer Brush-Solvent Systems

K. Hałagan, M. Banaszak, J. Jung, P. Polanowski, more

Computational Methods in Science and Technology > 2021 > Vol. 27, No. 4 > 141--149

Opposing polymer brush systems were investigated by computer simulations. In a coarse-grained model, chains were restricted to a face-centered cubic lattice with the excluded volume interactions only. The macromolecules were grafted onto two parallel impenetrable surfaces. The dynamic properties of these systems were studied by means of Monte Carlo simulations. The Dynamic Lattice Liquid model and...

article

Technology of Real-World Analyzers (TAUR) and its practical application

J. Jung, R. Kiełbik, K. Hałagan, P. Polanowski, more

Computational Methods in Science and Technology > 2020 > Vol. 26, No. 3 > 69--75

The article describes the most important details of the project for reconfigurable construction of dedicated electronic machines intended for performing analyses of phenomena that occur in multi-component systems containing at least several million mutually interacting elements. Devices built in the presented technology can be characterized by the use of reconfigurable integrated circuits, spatial...

article

The influence of temperature on the percolation threshold in two-dimensional polymer systems

A. Sikorski

Computational Methods in Science and Technology > 2020 > Vol. 26, No. 4 > 143--149

The structure of a two-dimensional film formed by strongly adsorbed polymer chains was studied by means of Monte Carlo simulations. We investigated the percolation in systems consisting of flexible polymer chains. A coarse-grained polymer chains representation was assumed and polymer chains were represented by linear sequences of lattice beads. The positions of these beads were restricted to vertices...

article

Properties of active rectifier with LCL filter in the selection process of the weighting factors in finite control set-MPC

P. Falkowski, A. Sikorski, K. Kulikowski, M. Korzeniewski

Bulletin of the Polish Academy of Sciences. Technical Sciences > 2020 > Vol. 68, nr 1 > 51--60

One of the main problems of multivariable cost functions in model predictive control is the choice of weighting factors. Two finite control set model predictive control algorithms, applied to the three-phase active rectifier with an LCL filter, are described in the paper. The investigated algorithms, i.e. PCicuc and PCigicuc, implement multivariable approaches applying line (grid) current, capacitor...

article

Predictive current control of three-phase matrix converter with GaN HEMT bidirectional switches

K. Nowaszewski, A. Sikorski

Bulletin of the Polish Academy of Sciences. Technical Sciences > 2020 > Vol. 68, nr 5 > 1077--1085

This paper presents an analysis and simulation studies of three-phase matrix converter with GaN HEMT bidirectional switches with predictive control of grid currents and converter output currents. Two methods of grid currents shaping are described and compared. The first method is based on calculations of instantaneous grid reactive power and the second one uses the active power of the load. The analyzed...

article

Blood utilization and mortality in victims of gun violence

Vincent M. DeMario, Robert A. Sikorski, David T. Efron, Mara A. Serbanescu, more

Transfusion > 58 > 10 > 2326 - 2334

BACKGROUND Blood transfusion can be lifesaving for patients with hemorrhage; however, transfusion requirements for victims of gun violence are poorly understood. STUDY DESIGN AND METHODS In an urban, Level 1 trauma center, 23,422 trauma patients were analyzed in a retrospective cohort study. Patients with gunshot wounds (GSWs) (n = 2,672; 11.4% of trauma patients) were compared to those with non‐GSW...

article

Reanalysis of the even configurations system of atomic niobium

J. Ruczkowski, M. Elantkowska, J. Dembczyński, A. Sikorski

Journal of Quantitative Spectroscopy and Radiative Transfer > 2018 > 217 > C > 13-21

In this work a reanalysis of the even configurations system of atomic niobium (Nb I) is presented. A multiconfiguration parametric calculation on the basis of 14 even configurations have been performed by taking into account the second-order of the perturbation theory. Satisfactory consistency of the values of experimental and calculated energy levels, Landé g_J factors and hyperfine structure constants...

article

Spectral clustering for non-reversible Markov chains

K. Fackeldey, A. Sikorski, M. Weber

Computational and Applied Mathematics > 2018 > 37 > 5 > 6376-6391

Spectral clustering methods are based on solving eigenvalue problems for the identification of clusters, e.g., the identification of metastable subsets of a Markov chain. Usually, real-valued eigenvectors are mandatory for this type of algorithms. The Perron Cluster Analysis (PCCA+) is a well-known spectral clustering method of Markov chains. It is applicable for reversible Markov chains, because...

article

From the Dynamic Lattice Liquid Algorithm to the Dedicated Parallel Computer – mDLL Machine

J. Jung, R. Kiełbik, K. Rudnicki, K. Hałagan, more

Computational Methods in Science and Technology > 2018 > Vol. 24, No. 4 > 235--247

The designing, production and testing of the mDLL machine led to the development of such a structure in which operational cells (e.g. KDLL) were located in the nodes of a three-dimensional torus network and the device was scalable. Thus, the future expansion of this device with additional Printed Circuit Boards (PCB) will not result in lengthened wire connections between Field-Programmable Gate Arrays...

article

Autologous blood salvage in the era of patient blood management

R. A. Sikorski, N. A. Rizkalla, W. W. Yang, S. M. Frank

Vox Sanguinis > 112 > 6 > 499 - 510

Almost 150 years after the first autologous blood transfusion was reported, intraoperative blood salvage has become an important method of blood conservation. The primary goal of autologous transfusion is to reduce or avoid allogeneic red blood cell transfusion and the associated risks and costs. Autologous salvaged blood does not result in immunological challenge and its consequences, provides a...

article

Ortho group activation of a bromopyrrole ester in Suzuki-Miyaura cross-coupling reactions: Application to the synthesis of new microtubule depolymerizing agents with potent cytotoxic activities

John T. Gupton, Scott Yeudall, Nakul Telang, Megan Hoerrner, more

Bioorganic & Medicinal Chemistry > 2017 > 25 > 12 > 3206-3214

New microtubule depolymerizing agents with potent cytotoxic activities have been prepared with a 5-cyano or 5-oximino group attached to a pyrrole core. The utilization of ortho activation of a bromopyrrole ester to facilitate successful Suzuki-Miyaura cross-coupling reactions was a key aspect of the synthetic methodology. This strategy allows for control of regiochemistry with the attachment of four...

article

Dziękuję leśnikom

A. Sikorski

Głos Lasu > 2017 > 4

article

Frequency based islanding detection methods in power electronic converters

K. Dmitruk, M. Korzeniewski, A. Sikorski

Power Electronics and Drives > 2017 > Vol. 2 (37), No. 1 > 27--41

Frequency based methods developed to detect an islanding condition in modern power grid structures have been discussed. The condition may occur in power grid lines to which additional energy sources with power electronic converters have been connected such as solar panels or wind turbines. It is a hazardous operating state for grid workers and devices connected to the islanded part of the grid. Such...

article

Monte-Carlo Simulations of Two-Dimensional Polymer Solutions with Explicit Solvent Treatment

P. Polanowski, J. K. Jeszka, A. Sikorski

Computational Methods in Science and Technology > 2017 > Vol. 23, No. 4 > 305--316

The static properties of two dimensional athermal polymer solutions with explicit solvent molecules were studied by Monte Carlo lattice simulations using the cooperative motion algorithm (CMA). The simulations were performed for a wide range of polymer chain length N (from 16 to 1024) and polymer concentration (from 0.0156 to 1.00). The results obtained for short chains (N < 256) were in good agreement...

article

FACET5 in the recruitment and managing process as regards production personnel – case study

A. Sikorski

Production Engineering Archives > 2017 > Vol. 15 > 36--40

The hereby article describes the study of two cases, the recruitment process as regards a newly created position and the decision concerning promotion to a managerial position. In both cases tool called Facet5 (used for measuring employees' potential) was applied to support decisions connected with human resources. As far as the first case is concerned, the profile of an ideal candidate was established...

article

The Comparison of Monte Carlo Algorithms Applied for Off-Lattice Models of Polymer Chains

A. Kuriata, D. Gront, A. Sikorski

Computational Methods in Science and Technology > 2016 > Vol. 22, No. 4 > 179--185

We designed two simplified models of macromolecular systems. Model chains were built of united atoms (statistical segments): the first one was a bead-spring model while in the second one beads were connected by bonds of constant length. The only potential introduced was the excluded volume and thus the system was athermal. Monte Carlo simulations of these models were carried out using Metropolis-like...

article

Integracja oprogramowania klasy Open BIM w inżynierii projektów budowlanych

T. Wiatr, A. Sikorski

Biuletyn Wojskowej Akademii Technicznej > 2016 > Vol. 65, nr 4 > 178--192

Klasyczne zarządzanie projektami w budownictwie oparte jest na wielu wyspecjalizowanych aplikacjach komputerowych, które w nikłym zakresie wymieniają między sobą dane. Metodyka BIM (Building Information Modelling) umożliwia współpracę i wymianę danych — w szczególności w oparciu o format IFC (Industrial Foundation Classes) — obejmując projektowanie budowlane w CAD i FEM oraz planowanie budowy z użyciem...

article

New DPC Look-Up Table Methods for Three-Level AC/DC Converter

K. Kulikowski, A. Sikorski

IEEE Transactions on Industrial Electronics > 2016 > 63 > 12 > 7930 - 7938

This paper presents new look-up table methods for a three-level ac/dc converter supplied from the grid. The nonlinear direct power control (DPC) method, by reason of its drawbacks resulting from the omission of grid inductance voltage drop, has been improved in the DPC-

${\updelta}$

$5\times2$

method by rotating the orientation of coordinates by angle

${\updelta}$

, i.e., the angle between grid voltage...

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PRZEKSZTAŁTNIK AC/DC (7)
AC/DC/AC CONVERTER (6)
DTC (6)
LATTICE MODELS (6)
PREDICTIVE CONTROL (6)
2.50.NG (5)
61.25.HQ (5)
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INFONA - science communication portal

Search results for: A. Sikorski

Assessing predictors of futility in patients receiving massive transfusions

Rare case of presence of nematodes Dirofilaria repens in apleural cavity of a dog

Computer Simulation of the Dynamic Behavior of Double Polymer Brush-Solvent Systems

Technology of Real-World Analyzers (TAUR) and its practical application

The influence of temperature on the percolation threshold in two-dimensional polymer systems

Properties of active rectifier with LCL filter in the selection process of the weighting factors in finite control set-MPC

Predictive current control of three-phase matrix converter with GaN HEMT bidirectional switches

Blood utilization and mortality in victims of gun violence

Reanalysis of the even configurations system of atomic niobium

Spectral clustering for non-reversible Markov chains

From the Dynamic Lattice Liquid Algorithm to the Dedicated Parallel Computer – mDLL Machine

Autologous blood salvage in the era of patient blood management

Ortho group activation of a bromopyrrole ester in Suzuki-Miyaura cross-coupling reactions: Application to the synthesis of new microtubule depolymerizing agents with potent cytotoxic activities

Dziękuję leśnikom

Frequency based islanding detection methods in power electronic converters

Monte-Carlo Simulations of Two-Dimensional Polymer Solutions with Explicit Solvent Treatment

FACET5 in the recruitment and managing process as regards production personnel – case study

The Comparison of Monte Carlo Algorithms Applied for Off-Lattice Models of Polymer Chains

Integracja oprogramowania klasy Open BIM w inżynierii projektów budowlanych

New DPC Look-Up Table Methods for Three-Level AC/DC Converter

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