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Impact of ultrasound and optical biometry on refractive outcomes of cataract surgery after penetrating keratoplasty in keratoconus

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International Journal of Ophthalmology(English edition) 2019年第6期12卷 949-953页

作者： Katarzyna Krysik Anita Lyssek-Boron Dominika Janiszewska-Bil Edward Wylegala dariusz Dobrowolski Department of Ophthalmology with Pediatric Unit St.Barbara HospitalTrauma CentreSosnowiec 41-200Poland Department of Ophthalmology District Railway HospitalKatowice 40-760Poland Chair and Clinical Department of Ophthalmology School of Medicine with the Division of Dentistry in ZabrzeMedical University of Silesia in KatowiceKatowice 40-760Poland Hebei Provincial Eye Hospital Xingtai 054001Hebei ProvinceChina

AIM: To analyse the impact of ultrasound and optical intraocular lens(IOL) calculation methods on refractive outcomes of cataract phacoemulsification performed after penetrating keratoplasty(PK) in keratoconus. METHODS: Phacoemulsification cataract surgery was performed on 42 eyes of 34 patients with keratoconus who had previously undergone PK. The IOL power was determined by using both standard and corneal topography-derived keratometry using the SRK/T formula. We used two independent methods-ultrasound biometry(UB) and interferometry [optical biometry(OB)] for IOL calculation. The analysed data from medical records included demographics, medical history, best corrected visual acuity(BCVA) on Snellen charts, technique of IOL calculation and calculation formula and its impact on final refractive ***: BCVA ranged from 0.01 to 0.4(mean 0.09±0.19) before surgery and ranged from 0.2 to 0.7(mean 0.38±0.14) at 1 mo and from 0.2 to 1.0(mean 0.56±0.16)(P<0.05) at 3 mo, postoperatively. The refractive aim differed significantly from the refractive outcome in both the UB and OB groups(P<0.05). There was no statistically significant difference in the accuracy of the two biometry ***: The refractive aim in keratoconus eyes post-PK is not achieved with either ultrasound or OB.

关键词： ultrasound biometry optical biometry cataract surgery penetrating keratoplasty keratoconus

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Studies on thermal decomposition of phenol binder using TG/DTG/DTA and FTIR-DRIFTS techniques in temperature range 20-500 °C

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China Foundry 2018年第2期15卷 145-151页

作者： Artur Bobrowski dariusz Drozynski Beata Grabowska Karolina Kaczmarska Zaneta Kurleto–Koziol Marcin Brzezinski AGH University of Science and Technology Faculty of Foundry EngineeringKrakowpoland

This paper presents results of thermoanalytical and structural research on phenolic binder used in foundry for the preparation of moulding sand. The binder has been prepared based on resole type phenolic resin with the addition of ester hardener. The aim of the study was to determine the structural changes taking place in the phenolic binder under the influence of temperature. Results show that in the investigated range of temperatures, phenolic binder exhibits three exothermic thermal effects accompanying the decomposition process. The test results using the Diffuse Reflectance Infrared Fourier Transform Spectroscopy(DRIFTS) technique show that the addition of a hardener stabilizes the binder structure within methylene bridges. The reduction in the reaction rate observed in the DTA curve at about 330 °C can be associated with the formation of gaseous products by decomposition of the binder or, as suggested by the literature data, the formation of triple bonds and CN-HCN groups.

关键词： phenolic resin thermal decomposition IR spectroscopy thermal analysis DRIFTS

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Pediatric non-alcoholic steatohepatitis:The first report on the ultrastructure of hepatocyte mitochondria

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World Journal of Gastroenterology 2014年第15期20卷 4335-4340页

作者： Joanna M Lotowska Maria E Sobaniec-Lotowska Sylwia B Bockowska dariusz M Lebensztejn Department of General Pathomorphology Medical University of Bialystok15269 BialystokPoland Department of Medical Pathomorphology Medical University of Bialystok15269 BialystokPoland Department of Laboratory Diagnostics Maria Sklodowska-Curie Memorial Bialystok Oncology Center15027 BialystokPoland Department of Pediatrics Gastroenterology and AllergologyMedical University of Bialystok15274 BialystokPoland

AIM: To investigate the ultrastructure of abnormal hepatocyte mitochondria, including their cellular and hepatic zonal distribution, in bioptates in pediatric non-alcoholic steatohepatitis (NASH).

关键词： Pediatric non-alcoholic steatohepatitis Hepatocyte ultrastructure Megamitochondria with crystalline inclusions Foamy cytoplasm of hepatocytes

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Corrosion behavior of fine-grained Mg-7.5Li-3Al-1Zn fabricated by extrusion with a forward-backward rotating die(KoBo)

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Journal of Magnesium and Alloys 2022年第3期10卷 877-887页

作者： Anna Dobkowska Boguslawa Adamczyk-Cieslak Milena Koralnik Witold Chromiński Jiri Kubasek Jakub Ciftci dariusz Kuc Jaroslaw Mizera Faculty of Materials Science and Engineering Warsaw University of Technology141 WoloskaStWarsaw 02-507Poland Department of Metals and Corrosion Engineering University of Chemistry and TechnologyTechnicka 5Prague 616628Czechia Institute of Materials Engineering Silesian University of TechnologyKrasiÂnskiego 8Katowice 40-019Poland

The microstructure-dependent corrosion resistance of dual structured fine-grained Mg-7.5 Li-3 Al-lZn has been *** alloys were extruded using extrusion with a forward-backward rotating die(KoBo,a newly developed SPD method)at two different extrusion *** fine-grained microstructures formed in the alloys were characterized,and the influence of grain refinement on corrosion resistance was *** fine-grained(α+β)Mg-Li alloys,a higher extrusion ratio led to more intensive grain refinement;however,this relationship did not improve their corrosion resistance in a chloride-containing *** corrosion resistance of the alloys was mainly controlled by the refinement ofα(Mg)andβ(Li),along with the distribution of second *** presence of MgLi_(2) Al at grain boundaries facilitated their dissolution.

关键词： Corrosion Grain refinement Grain size distribution Magnesium alloy.

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Microstructure and corrosion resistance of a duplex structured Mg–7.5Li–3Al–1Zn

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Journal of Magnesium and Alloys 2021年第2期9卷 467-477页

作者： Anna Dobkowska Bogusława Adamczyk–Cieslak JiríKubásek Dalibor Vojtech dariusz Kuc Eugeniusz Hadasik Jarosław Mizera Faculty of Materials Science and Engineering Warsaw University of Technology141 Wołoska St02-507 WarsawPoland Chemistry Department Western University of Ontario1151 Richmond StLondonON N6A 5B7Canada Department of Metals and Corrosion Engineering University of Chemistry and TechnologyTechnicka 516628 Prague 6Czechia Institute of Materials Engineering Silesian University of TechnologyKrasinskiego 8St40-019 KatowicePoland

This study describes the corrosion resistance of extruded,and extruded with post-processing annealing,Mg–7.5 Li–3 Al–1 Zn *** results demonstrate that extrusion at 350°C with an extrusion speed 0.5 s^(-1) does not lead to the full recrystallization of the alloy,and the material still exhibits a dendritic *** post-processing annealing triggers the microstructure transformation,and the relative composition of the alloy *** ratio ofβ(Li)toα(Mg)in the extruded alloy was 29–71%;after annealing amount ofβ(Li)increased,and the ratio ofβ(Li)toα(Mg)in the annealed alloy was 35–65%.Corrosion testing shows that in 3.5 wt%Na Cl the extruded alloys immediately undergo strong *** a result of the subsequent annealing,an improvement of corrosion resistance is *** higher amount ofβ(Li)in the annealed alloy reduces the area ratio of cathodic to anodic sites of corrosion,and this makes the annealed alloy more resistive under the analyzed conditions.

关键词： Magnesium-Lithium corrosion Extrusion Annealing

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Water level changes in Polish lakes during 1976–2010

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Journal of Geographical Sciences 2016年第1期26卷 83-101页

作者： dariusz WRZESI?SKI Mariusz PTAK Institute of Physical Geography and Environmental Planning Adam Mickiewicz University

The paper presents the analysis of tendencies in water level changes in 32 lakes in Poland during 1976–*** of monthly,seasonal,and annual precipitation and air temperature for 9 meteorological stations were also *** trend analysis for all of the studied series of water levels in lakes showed high spatial and temporal *** of annual water levels in the case of 6 lakes showed statistically significant increasing tendencies,and in 7 lakes,significant decreasing *** of annual amplitudes in the majority of lakes(22) showed a decreasing trend,but they were statistically significant only in three *** tendencies for air temperature fluctuations are more statistically significant than *** key role in determining water level changes is played by local factors,particularly including human economic activity,obscuring the effect of natural factors on water level *** paper describes cases of changes in water levels in lakes under anthropopressure related to among others: agricultural irrigations,hydropower infrastructure,water transfers,navigation,or mining.

关键词： lake-level trends lake-level regime Mann-Kandell Test climate change human activity

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Discrete-time dynamic graphical games:model-free reinforcement learning solution

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Control Theory and Technology 2015年第1期13卷 55-69页

作者： Mohammed I.ABOUHEAF Frank L.LEWIS Magdi S.MAHMOUD dariusz G.MIKULSKI Systems Engineering Department King Fahd University of Petroleum & Mineral UTA Research Institute University of Texas at ArlingtonFort Worth Texas U.S.A. State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Ground Vehicle Robotics (GVR) U.S. Army TARDEC Warren MI U.S.A.

This paper introduces a model-free reinforcement learning technique that is used to solve a class of dynamic games known as dynamic graphical games. The graphical game results from to make all the agents synchronize to the state of a command multi-agent dynamical systems, where pinning control is used generator or a leader agent. Novel coupled Bellman equations and Hamiltonian functions are developed for the dynamic graphical games. The Hamiltonian mechanics are used to derive the necessary conditions for optimality. The solution for the dynamic graphical game is given in terms of the solution to a set of coupled Hamilton-Jacobi-Bellman equations developed herein. Nash equilibrium solution for the graphical game is given in terms of the solution to the underlying coupled Hamilton-Jacobi-Bellman equations. An online model-free policy iteration algorithm is developed to learn the Nash solution for the dynamic graphical game. This algorithm does not require any knowledge of the agents＇ dynamics. A proof of convergence for this multi-agent learning algorithm is given under mild assumption about the inter-connectivity properties of the graph. A gradient descent technique with critic network structures is used to implement the policy iteration algorithm to solve the graphical game online in real-time.

关键词： Dynamic graphical games Nash equilibrium discrete mechanics optimal control model-free reinforcementlearning policy iteration

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Fabrication and long persistent luminescence of Ce3+-Cr3+co-doped yttrium aluminum gallium garnet transparent ceramics

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Journal of Rare Earths 2022年第11期40卷 1699-1705,I0002页

作者： Qiang Liu Wenli Wang Zhengfa Dai Vitali Boiko Haohong Chen Xin Liu Danyang Zhu Jian Xu dariusz Hreniak Jiang Li School of Material Science and Engineering Jjiangsu University Zhenjiang 212013China Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Institute of Low Temperature and Structure Research Polish Academy of SciencesOkolna 250-422WroclawPoland International Center for Young Scientists(ICYS) National Institute for Materials Science(NIMS)Tsukuba305-004 Japan Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBejing 100049China

Pe rsistent luminescence(Pers L)materials are widely used in safety indication,traffic and transportation signs,architectural decoration and other *** this paper,(Y_(1-x)Ce_(x))(Al_(0.9995)Cr_(0.0005))_(2)Ga_(3)O_(12)(x=0.001,0.002,0.003,0.005)transparent ceramics were successfully prepared by solid-state reaction method in air followed by HIP *** the increase of Cedoping concentration,the optical quality of the as-prepared ceramics is improved and the morphology is *** quenching occurs when the Ceconcentration is more than 0.2%.The as-prepared transparent ceramics we re annealed in different atmosphere *** the PersL decay curve s,the transparent ce ramics after air annealing show the best PersL performance:luminance with 4424.0 mcd/m^(2)and PersL duration over865 min after ceasing 365 nm excitation,*** effects of Cedoping concentration and annealing atmospheres are also discussed in detail.

关键词： Transparent ceramics Yttrium aluminum gallium garnet Persistent luminescence Rare earths

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Ultrasound findings in autoimmune hepatitis

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World Journal of Gastroenterology 2018年第15期24卷 1583-1590页

作者： Yi Dong Andrej Potthoff Christoph Klinger Ana Paula Barreiros dariusz Pietrawski Christoph F Dietrich Department of Ultrasound Zhongshan Hospital Fudan University Department of Gastroenterology Hepatology and Endocrinology Medizinische Hochschule Hannover Department of Internal Medicine 1 Klinikum Ludwigsburg German Organ Transplantation Foundation Region Mitte Department of Internal Medicine 2 Caritas-Krankenhaus Bad Mergentheim

Ultrasound findings in autoimmune hepatitis(AIH) have not been reported systematically so far. The use of reliable and accurate noninvasive methods for determining fibrosis stage is important in evaluation of treatment efficacy and fibrosis regression in AIH. Imaging plays an important role in detection of complications and ruling out other possible causes of chronic liver diseases. Ultrasound elastography cutoff values in AIH patients are not the same as those in patients with chronic viral hepatitis or non-alcoholic fatty liver disease. AIH is characterized by wide fluctuations in inflammatory activity. Here we report on current knowledge of ultrasound findings in AIH.

关键词： Autoimmune hepatitis Fibrosis stage Ultrasound Elastography Chronic liver diseases

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Analytical Solution of Helmholtz Equation in Anisotropic and Nonhomogeneous Region

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Journal of Energy and Power Engineering 2014年第7期8卷 1265-1271页

作者： dariusz Spalek Institute of Electrotechnics and Informatics Silesian University of Technology Gliwice PL 44-100 Poland

The analytical solution of Helmholtz equation for magnetic vector potential in anisotropic and nonhomogeneous region is presented. The solution is built of a combination of both Bessel and power functions. There are developed two examples that proof the accuracy of the proposed analytical solution. First example is showing the electromagnetic field analysis in slot of ferromagnetic rotor of electrical induction machine. The second example approaches electromagnetic field wave in resonator of the form of rectangular cavity The analytical solution presented is treated as an exact one and is being compared with the numerical solution, e.g., given by finite element method. The analytical solution can be used as a benchmark test for numerical algorithms,

关键词： Helmholtz equation anisotropic and nonhomogeneous region analytical and numerical solutions.

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