Studies on Manufacturing, Mechanical Properties and Structure of Poly(butylene adipate-co-terephthalate)-based Green Composites Modified by Coconut Fibers

Rafał Malinowski,Katarzyna Krasowska,Wanda Sikorska,Krzysztof Moraczewski,Daniel Kaczor,Daria Kosmalska,Bogusław Królikowski 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.6

Proper design and manufacturing of biodegradable composites containing natural fibers is highly demanded to improve its functional properties and reduce effects of the mechanical-thermal degradation at the same time. Therefore investigation of poly(butyleneadipate-co-terephthalate) (PBAT) modified with coconut fiber (CF) was performed to analyze changes in selected properties of the modified polymer, occurring upon various amounts of CF and different conditions of processing of blends composed of PBAT and CF. Changes in basic parameters of the extrusion process occurring upon two different plasticizing systems, as well as in mass flow rate, mechanical properties, and structure of PBAT/CF composites were examined. It was found that the design of a plasticizing system essentially influenced energy consumption and stability of the processing procedure as well as properties of manufactured materials. Increase in the weight fraction of CF introduced into the polymer matrix caused increase in rigidity and hardness of the composite and reduction in its strength and ability to deform. No eff ect of the processing conditions on adhesion at the phase boundary was found. All the prepared composites showed strong adhesion between components. Moreover, based on MFR results it was found occurrence of the mechanicalthermal degradation of both phases, especially the dispersed phase.

Baduk and human life

Wodzimierz Malinowski 국제바둑학회(구 한국바둑학회) 2001 국제학술대회논문집 Vol.2001 No.1

바둑과 인생

Wodzimierz Malinowski 국제바둑학회(구 한국바둑학회) 2001 국제학술대회논문집 Vol.2001 No.1

Latin Teaching in Poland

Go?ciwit Malinowski 한국서양고전학회 2016 西洋古典學硏究 Vol.55 No.3

Inhabitants of Polish lands began to learn Latin following the conversion of Mieszko I to Christianity in 966. In this early period the teaching of Latin in Polish lands certainly benefited from the experience of the other native Slavs. The first Pole who was said expressis verbis to have known Latin was King Mieszko II. The first author of texts written in Latin was his daughter Gertrude. The spread of knowledge of Latin in Poland beyond the narrow elite took several centuries. At first it was confined to cathedral, collegiate and monastic educational institutions. A turning point for the universality of Latin teaching in Poland came, however, with the development of parish education, which followed on from the end of the thirteenth century, reaching its apogee at the turn of the sixteenth. In the seventeenth century religious orders took upon themselves the weight of education. A retreat from teaching Latin began in the Age of Enlightenment, together with the budding of the French model of education. In 1783 the Commission of National Education abolished educational instruction in Latin, which began to be a taught subject which was intended to serve as a foundation of citizenship for young people, rather than as a means of conversing and learning about subjects in that language. Also in 1783 F. A. Wolf held the first philological seminar in the world at the university in Halle. Neohumanism came to the fore. In the spirit of neohumanism in the years 1809-1810 Wilhelm von Humboldt reformed secondary education in Prussia by founding classical gymnasia. In subsequent years this educational model was adopted in Austria and Russia, and so in all empires which occupied Polish territory. At the turn of the twentieth century the position of classical languages began to weaken when the majority of classical gymnasia were closed down and replaced by actual gymnasia. In a Poland which had been reborn in 1918, the reform in 1932 led to a further reduction in the study of Latin and Greek. After the end of the II world war Poland around 30% of pupils were still able to learn Latin, despite the fact that the study of classical philology was abolished by Communists as reactionary at several universities. In 1967 a further educational reform relegated Latin to the role of optional subjects. The decline of the role of Latin in public schools coincided with the waning of Latin in liturgical contexts and in the everyday life of the Catholic Church. After 1989 along with the implosion of the totalitarian system the Latin teaching disintegrated almost completely. The grouping of the post-Communists and the liberal left, which dominated in Poland during the years 1989-2015 and preached the need for rapid modernization at any cost, was not remotely interested in the teaching of Latin in schools. The decline of Latin in Polish schools is especially evident in the context of school-level education in other European countries, Italy (where 76% of lyceum students learn Latin), Austria (34%), Germany (32%), Flanders (24%) and finally France (13%). Between 2010 and 2015 the percentage of lyceum students studying Latin in Poland fell from 5.7% to barely 2.5%.

Bending and buckling of a rectangular porous plate

K. Magnucki,M. Malinowski,J. Kasprzak 국제구조공학회 2006 Steel and Composite Structures, An International J Vol.6 No.4

A rectangular plate made of a porous material is the subject of the work. Its mechanical properties vary continuously on the thickness of a plate. A mathematical model of this plate, which bases on nonlinear displacement functions taking into account shearing deformations, is presented. The assumed displacement field, linear geometrical and physical relationships permit to describe the total potential energy of a plate. Using the principle of stationarity of the total potential energy the set of five equilibrium equations for transversely and in-plane loaded plates is obtained. The derived equations are used for solving a problem of a bending simply supported plate loaded with transverse pressure. Moreover, the critical load of a bi-axially in-plane compressed plate is found. In both cases influence of parameters on obtained solutions such as a porosity coefficient or thickness ratio is analysed. In order to compare analytical results a finite element model of a porous plate is built using system ANSYS. Obtained numerical results are in agreement with analytical ones.

Delamination localization in wind turbine blades based on adaptive time-of-flight analysis of noncontact laser ultrasonic signals

Park, Byeongjin,Sohn, Hoon,Malinowski, Pawel,Ostachowicz, Wieslaw Taylor Francis 2017 Nondestructive testing and evaluation Vol.32 No.1

<P>In this study, a two-level scanning strategy for a noncontact laser ultrasonic measurement system is proposed to expedite the inspection of a wind turbine blade. First, coarse scanning of the entire blade is performed with a low spatial resolution for initial delamination localisation. Then, dense scanning with a high spatial resolution is performed only within the identified delaminated region for delamination visualization. This study especially focuses on the initial delamination localisation using adaptive coarse scanning. Laser ultrasonic responses from two pitch-catch paths, names inspection pairs, are obtained within a specified coarse scanning grid. Then, potential delamination locations within the given grid are estimated through time-of-flight analysis of delamination reflected waves. Once potential delamination locations are estimated, new inspection pairs are placed near the potential locations for precise localisation. These steps are repeated for every coarse scanning grids on the target wind turbine blade. The feasibility of the proposed technique for rapid delamination detection is demonstrated with a 10 kW glass fibre reinforced plastic wind turbine blade.</P>

Dynamic stability of a metal foam rectangular plate

D. Debowski,K. Magnucki,M. Malinowski 국제구조공학회 2010 Steel and Composite Structures, An International J Vol.10 No.2

The subject of the paper is an isotropic metal foam rectangular plate. Mechanical properties of metal foam vary continuously through plate of the thickness. A nonlinear hypothesis of deformation of plane cross section is formulated. The system of partial differential equations of the plate motion is derived on the basis of the Hamilton’s principle. The system of equations is analytically solved by the Bubnov-Galerkin method. Numerical investigations of dynamic stability for family rectangular plates with respect analytical solution are performed. Moreover, FEM analysis and theirs comparison with results of numerical-analytical calculations are presented in figures.

Impaction Fractures of the Lateral Femoral Condyle Related to Anterior Cruciate Ligament Injury: A Scoping Review Concerning Diagnosis, Prevalence, Clinical Importance, and Management

Marcin Mostowy,Kacper Ruzik,Michał Ebisz,Robert F. LaPrade,Konrad Malinowski 대한정형외과학회 2023 Clinics in Orthopedic Surgery Vol.15 No.5

Background: During pivot-shift anterior cruciate ligament (ACL) injury, bone bruises or impaction fractures of the lateral femoral condyle (LFC-IF) may occur due to impaction between the posterior part of the lateral tibial plateau and anterocentral part of the LFC. The purpose of the study was to systematically review the literature concerning the diagnosis, prevalence, clinical importance, and management of LFC-IF occurring during ACL injuries. Methods: Included were studies concerning impaction fractures of the anterocentral part of the LFC occurring during ACL injuries. Studies concerning only bone bruises or cartilage lesions, without subchondral bone impaction, were not included. A search was performed in Medline and Scopus databases, with final search in May 2022. A secondary search was conducted within the bibliographies of included articles and using “Cited In” option. Two authors independently extracted data in three domains: study design, LFC-IF characteristics, and LFC-IF importance and management. Results: A total of 35 studies were included for review with several studies reporting on multiple domains. Summarily, 31 studies were on the diagnosis and prevalence, 19 studies reported on the clinical importance, and 4 studies reported on the management of LFC-IF. Conclusions: A LFC-IF occurs due to the pivot-shift mechanism of ACL injury. Its radiological feature is defined as an impaction of terminal sulcus deeper than 1 mm and is present in up to 52% of patients with a torn ACL. An LFC-IF causes injury to the cartilage, probably leads to its progressive degeneration, and is significantly associated with an increased risk of a lateral meniscus injury. A large LFC-IF might be associated with greater rotational knee instability. Although several techniques of LFC-IF treatment were proposed, none of them has been evaluated on a large cohort of patients to date.

Simple Technique Reducing Leakage Current for H-Bridge Converter in Transformerless Photovoltaic Generation

Radoslaw Kot,Sebastian Stynski,Krzysztof Stepien,Jaroslaw Zaleski,Mariusz Malinowski 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1

Given their structural arrangement, photovoltaic (PV) modules exhibit parasitic capacitance, which creates a path for high-frequency current during zero-state switching of the converter in transformerless systems. This current has to be limited to ensure safety and electromagnetic compatibility. Many solutions that can minimize or completely avoid this phenomenon, are available. However, most of these solutions are patented because they rely on specific and often complex converter topologies. This study aims to solve this problem by introducing a solution based on a classic converter topology with an appropriate modulation technique and passive filtering. A 5.5 kW single-phase residential PV system that consists of DC-DC boost stage and DC-AC H-bridge converter is considered. Control schemes for both converter stages are presented. An overview of existing modulation techniques for H-bridge converter is provided, and a modification of hybrid modulation is proposed. A system prototype is built for the experimental verification. As shown in the study, with simple filtering and proper selection of switching states, achieving low leakage current level is possible while maintaining high converter efficiency and required energy quality.

Extraordinary Hall Effect in Pt- or Ni-based Multilayer Stacks with Strong Perpendicular Magnetic Anisotropy

Heinen Jan,Schulz Tomek,Kl¨aui Mathias,Boulle Olivier,Malinowski Gregory,Swagten Henk,Koopmans Bert,Ulysse Christian,Faini Giancarlo,Ocker Berthold,Wrona Jerzy,Ahn Sung-Min,Nguyen Ngoc-Minh,Ravelosona 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10

We determine in high anisotropy Pt/Co- and Ni/Co-based multilayer materials, which are candidates for high density storage applications, the contributions to the extraordinary Hall effect. In order to gain more insight into the physics underlying these processes, the dependence of the extraordinary Hall resistivity on the longitudinal resistivity is used to identify the skew scattering and the combined intrinsic and side jump effects when analyzing their variation with temperature. Furthermore, the influence of an additional amorphous CoFeB layer is shown, revealing a possibility to enhance the extraordinary Hall effect using this material.