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    Wyświetlanie 1-14 z 14
    Tytuł:
    Bonding of high temperature thermoplastic carbon composites with resistance welding technique
    Łączenie kompozytów węglowych na osnowie z wysokotemperaturowych termoplastów z zastosowaniem techniki zgrzewania elektrooporowego
    Autorzy:
    Dobrzański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/36388164.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    thermoplastic composites
    resistance welding
    joining thermoplastic composites
    termoplasty
    zgrzewanie elektrooporowe
    łączenie kompozytów z termoplastów
    Opis:
    The article presents 'state-of-the art' on joining fibre reinforced thermoplastic composites with the use of resistance welding technique. Their welding process and potential difficulties connected with the process and quality control of a manufactured element arc presented. The structure of a typical thermoplastic composite welding stand was also presented. The main welding technology elements were characterized: structure of the resistance element, implementation of the thermal process and pressure application required for joining materials. The paper also presents the required calibration ranges for a technological process with the use of strength test types SLS, DCB, SBS and nondestructive testing of joint with the ultrasonic method.
    W artykule zaprezentowano aktualny stan wiedzy dotyczącej łączenia kompozytów o spoiwie termoplastycznym wzmacnianych włóknami syntetycznymi z użyciem technologii elektrooporowej. Przedstawiono proces ich zgrzewania oraz trudności związane z realizacją procesu i kontrolą jakości wytworzonego połączenia. Opisano budowę typowego stanowiska do zgrzewania kompozytów o spoiwie termoplastycznym. Scharakteryzowano podstawowe elementy technologii zgrzewania: budowę elementu oporowego, realizację procesu cieplnego zgrzewania oraz realizację docisku wymaganego do połączenia materiałów. W artykule przedstawiono zakres wymaganej kalibracji procesu technologicznego dokonywanej na podstawie badań wytrzymałościowych (próbki jednozakładkowej, podwójnej belki wspornikowej oraz zginanej krótkiej belki) oraz diagnostyki połączeń zgrzewanych metodą ultradźwiękową.
    Źródło:
    Transactions on Aerospace Research; 2018, 3 (252); 7-18
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Verification of Numerical Calculations with the Use of Digital Image Correlation
    Eksperymentalna weryfikacja obliczeń numerycznych z zastosowaniem cyfrowej korelacji obrazu
    Autorzy:
    Bajurko, P.
    Dobrzański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/213210.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    digital image correlation
    FEM
    delamination
    buckling
    carbon-epoxy laminate
    cyfrowa korelacja obrazu
    MES
    delaminacja
    wyboczenie
    laminat węglowo-epoksydowy
    Opis:
    The article presents the results of research work performed under the TEBUK project, aiming primarily to develop a reference methodology for assessing the impact of damage on the strength of structures made of carbon epoxy prepregs. The tests described in the paper were concerned with a fragment of the structure (FS) of the TEBUK project demonstrator, made of carbon epoxy composite, with an artificial circular delamination measuring 40 mm in diameter. Numerical and experimental test of FS have been performed under quasi-static compression load. The buckling of the skin observed in the delamination area, as well as the propagation of the latter were investigated. The numerical calculations have been performed with the use of the commercially available MSC Marc/Mentat calculation suite based on the Finite Elements Methods. Results of the numerical calculations have been compared with experimental measurements made with the use of the Digital Image Correlation (DIC) method. The tests performed aimed to provide a preliminary verification of the numerical model. The results obtained have shown a very good correlation between the numerical and experimental results concerned with critical load levels at which stability of the layers separated by delamination is lost (buckling). The lack of convergence of the numerical model’s results after exceeding the critical load values has rendered it impossible to unequivocally compare the results concerned with propagation of the delamination area.
    Artykuł dotyczy prac badawczych realizowanych w ramach projektu TEBUK, którego głównym celem było opracowanie wzorcowej metodyki oceny wpływu uszkodzeń na wytrzymałość konstrukcji wykonanych z preimpregnatów węglowo-epoksydowych. Obiektem prezentowanych badań był fragment struktury (FS) demonstratora projektu TEBUK wykonany z kompozytu węglowo-epoksydowego ze sztucznie wprowadzoną delaminacją kołową o średnicy 40 mm. Wykonano numerycznie i eksperymentalnie badania FS w warunkach quasi-statycznego obciążenia ściskającego, w trakcie których analizowano wyboczenie pokrycia w obszarze delaminacji oraz jej propagację. Obliczenia numeryczne przeprowadzono w komercyjnym pakiecie obliczeniowym MSC Marc/Mentat bazującym na metodzie elementów skończonych. Wyniki analiz numerycznych porównywano z pomiarami eksperymentalnymi zmierzonymi metodą Cyfrowej Korelacji Obrazu (CKO). Przeprowadzone badania miały za zadanie wstępną weryfikację modelu numerycznego. Uzyskane wyniki wykazały bardzo dobrą zbieżność wyników numerycznych i eksperymentalnych dotyczących obciążeń krytycznych, w których następuje utrata stateczności (wyboczenie) warstw odseparowanych delaminacją. Natomiast brak zbieżności obliczeń w modelu numerycznym po przekroczeniu obciążeń krytycznych nie pozwolił jednoznacznie porównać wyników dotyczących propagacji delaminacji.
    Źródło:
    Prace Instytutu Lotnictwa; 2018, 2 (251); 7-21
    0509-6669
    2300-5408
    Pojawia się w:
    Prace Instytutu Lotnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of robust filtering of stratified surface topography
    Autorzy:
    Dobrzański, P.
    Pawlus, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220827.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-process surfaces
    digital filtering
    robust filter
    valley suppression filter
    modification of filter
    Opis:
    Various components of surface texture are identified, namely form, waviness and roughness. Separation of these components is done by digital filtering. Several problems exist during analysis of two-process surfaces. Therefore the Gaussian robust profile filtering technique was established and has been studied here. The computer generated 2D profiles and 3D surface topographies having triangular scratches as well as measured stratified surfaces were subjected to filtration. However even robust filter applications cause distortion of profiles having valleys wider than 100 ěm. In order to minimize the distortion associated with wide and deep valleys, the robust filter should be modified. A special procedure was elaborated for minimizing distortion of roughness profiles caused by filtration. Application of this method to analyses of several profiles was presented. The difference between 1-D and 2-D filtering of surface topography using the same kind of filter was discussed. As a result we found that modification of a 2-D surface topography filter was not necessary.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 107-118
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tooling development for thermoplastic composites thermoforming process based on FEM analysis : a rib case study
    Autorzy:
    Dobrzański, P.
    Molak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/243864.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    rubber thermoforming
    rubber press forming
    thermoplastic composite
    Opis:
    Remarkable characteristics of high temperature thermoplastic (HTP) matrix used in composite materials reinforced with continuous fibres causes growing application in composite industry. Because of high processing temperature of some semi, crystalline matrix there is limited number of technologies that can be used for part manufacturing. Press forming is an example of technology that allows manufacturing high quality complex parts made of HTP reinforced fibres composite. In order to manufacture part with acceptable quality and mechanical properties, uniform pressure distribution during the process is required. In this article, tooling design process focused on uniform pressure distribution for manufacturing of supporting rib was presented. In order to satisfy this requirement, the rubber stamp was proposed as a tool for manufacturing. Typical press forming process defects were identified and the requirements for rubber stamp were described. It was assumed that the forming process has to begin at one point on mould surface and sequentially continue in all directions. For stamp material, the two components additive silicone was selected. The hardness of the silicone was equal 40 Shore A. The rubber mechanical properties was determined through the additional tests and used for stamp designing. The tooling was designed using FEM software ABAQUS 6.12. The sequence of stamp shape designing and optimization in order to meet the stamp requirements was presented. At the end the FEM rubber stamp designing recommendation were presented.
    Źródło:
    Journal of KONES; 2018, 25, 4; 67-74
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser navigation applications for automated guided vehicles
    Autorzy:
    Śmieszek, M.
    Dobrzańska, M.
    Dobrzański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/114148.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    navigation
    automated guided vehicles
    laser scanners
    Opis:
    In this paper, the basics of navigation in automated guided vehicles are presented. Errors in determining the position and methods used for the position correction are described. These methods are based on laser technology. In the work, two such methods are presented. The first one uses a laser scanner to measure the angles between the markers. The second method uses a laser scanner applied to the development of digital maps. The considerations included in the work are supported by some examples.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 11; 503-506
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of reference plane on values of areal surface topography parameters from cylindrical elements
    Autorzy:
    Podulka, P.
    Dobrzański, P.
    Pawlus, P.
    Lenart, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221539.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface topography
    reference element
    cylinder liners
    oil pockets
    piston skirts
    Opis:
    In this paper distortion of surface topography measurement results by improper selection of the reference plane is taken into consideration. The following types of surfaces from cylindrical elements were analyzed: cylinder liners after plateau honing, cylinder liners with additionally burnished oil pockets and turned piston skirts. Surface topographies of these elements after a low wear process were also studied. In order to obtain areal surface topography parameters, the form was eliminated using cylinders and polynomials of the following degrees: 2, 3, 4, 6, 8, 10 and 12. Parameters of surfaces after form removal were compared. After analysis of results the reference elements for each kind of surface were recommended. A special procedure was proposed in order to select the degree of a polynomial. This method is based on surface topography changes with increase of polynomial degree. The effect of improper form elimination on measuring uncertainty was studied.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 247-256
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of pregnant and lactating sows to reduced protein content in complete compound feed
    Autorzy:
    Gajewczyk, P.
    Korniewicz, D.
    Kolacz, R.
    Dobrzanski, Z.
    Korniewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/31570.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pregnant sow
    lactating sow
    reduced protein content
    protein content
    feed
    piglet
    milk composition
    amino acid content
    pig
    animal production
    Opis:
    The experimental material consisted of 42 sows divided into 3 feeding groups, each containing 14 sows fed complete compound feed varying in protein content. Protein and amino acid content of the feed fed to the control group was in compliance with Polish standards. Protein content in the experimental groups was reduced by 10% and 20%, respectively. At the same time, lysine, methionine, threonine and tryptophane content was supplemented to the level of the control group. All pregnant and lactating sows were fed individually. The condition of the sows was determined by measuring the thickness of backfat at the P2 position on days 30 and 105 of pregnancy and on day 25 of lactation. The data analyzed in the study included: the total number of piglets born, their body weight gain, milk composition, weaning-to-estrus interval and the farrowing rate. Protein content of the compound feed did not have a significant impact on the increment in backfat during pregnancy and losses during lactation. The sows fed compound feed with reduced protein content gave birth to 0.7 and 0.6 less piglets per litter than the control animals. However, due to lower losses, they bred 0.3 and 0.4 more piglets than the control sows. Average body weight of a piglet on day 21 was 0.5 kg lower in the experimental than in the control group. Dry matter, protein, fat and lactose content of the sow’s milk did not depend on protein content of the feed. The weaning-to-estrus interval in the experimental groups was one day longer than in the control group. The reproductive rate accounted for 86% and was comparable in all the groups.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of polymer impression masses for the obtaining of dental working models for the stereolithographic 3D printing
    Autorzy:
    Dobrzański, L. B.
    Achtelik-Franczak, A.
    Dobrzańska, J.
    Pietrucha, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/378584.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    polyvinyl siloxane impression material
    alignate impression material
    CAD/CAM in dentistry
    digital prosthetic working models
    materiał wyciskowy poliwinylosiloksanowy
    materiał wyciskowy alginianowy
    CAD/CAM w stomatologii
    Opis:
    Purpose: The aim of the work is to execute measurements of digital dental models taken by scanning prosthetic impressions using the engineering CAD software and finding dimensional differences and scale factor for precise reproduction of patient tooth dimensions. Design/methodology/approach: Tests were carried out involving the execution of 3 series of impressions for selected impression materials, which were then scanned using two types of prosthetic scanners. Gypsum models based on mentioned impressions were scanned and dimensionally compared with impression-based digital models. Benchmark impressions were also performed in order to verify the obtained results and determine the correction factor for dimensions. The dimensional differences between impression groups were calculated by using Engineering CAD software. Findings: It was found, that compared to the base model, the digital model has a smaller volume than the object being mapped, the digital models based directly on the impression should be 0.09 - 0.12% rescaled to match the dimensions of the base model. Research limitations/implications: It is necessary to perform a practical verification of the results achieved and apply the determined coefficient in practice by creating working models using precise devices such as a 3D SLA printer and verify their results with intraoral scanner based models. Practical implications: This test will allow making precise working models using a 3D printer, allowing finally to perform, for example, implant-based bridges directly from the level of implants, using the masses described in the study. Originality/value: The comparative studies of polyvinyl siloxane and alignate impression materials were carried out in order to measure dimensional differences between working models made directly from the impression and gypsum models and compared with pattern, which allowed to determine the expansion coefficient, which will allow to work in 3D printing technology with close representation of real situation in the patient's oral cavity, which is particularly important when performing full arch bridges and extensive work on implants, including direct implants. The work has practical applications for both dental engineers and dentists performing advanced prosthetic work.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 95, 1; 31-40
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of physical and chemical properties of cornelian cherry (Cornus mas L.) fruits depending on degree of ripening and ecotypes
    Autorzy:
    Szot, I.
    Szot, P.
    Lipa, T.
    Sosnowska, B.
    Dobrzański, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/12297776.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    fruit tree
    cherry
    Cornelian cherry
    Cornus mas
    fruit
    physical property
    chemical property
    fruit ripening
    ecotype
    Opis:
    Cornelian cherry in Poland belongs to the alternative fruit species. The fruits are suitable for fresh consumption, however they can be used for processing: juice, jams, jellies, syrups, tinctures. Fruits are abundant in mineral elements, vitamin C, organic acids, iridoids, anthocyanins and due to that they have health-promoting significance. In this experiment, the fruit quality of several 16-year-old ecotypes in the Lublin region was compared. They were compared in terms of the beginning of fruit ripening and fruit size (length, diameter, mass), fruit shape index, share of stone in the fruit, SSC, TA, SSC/TA, reducing sugar, dry matter content and anthocyanins content. The color of fruit was evaluated in two dates, visually and using HanterLab spectrophotometer. Cornelian cherry fruits began to mature at the beginning of August and at the latest at the end of August. With the increase of the maturity degree, the SSC, reducing sugars, TA, dry matter and anthocyanins increased significantly. There was no difference in the taste of light red fruits and dark red fruits, which were characterized by similar ratio of SSC/TA. Ecotype No. 11, as the earliest maturing, with big round fruits, dark red colored with the highest content of anthocyanins, could be distinguished. As well as ecotypes No. 4 and 5, ripening in mid-August, and having a high ratio of SSC/TA, providing a good taste. Studied ecotypes could be used in breeding programs to incorporate a wide range of quality and agronomic characteristics into a final cornelian cherry cultivar.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 2; 251-262
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication Of Scaffolds From Ti6Al4V Powders Using The Computer Aided Laser Method
    Wytwarzanie scaffoldów z proszków Ti6Al4V z użyciem komputerowo wspomaganej metody laserowej
    Autorzy:
    Dobrzański, L. A.
    Dobrzańska-Danikiewicz, A. D.
    Malara, P.
    Gaweł, T. G.
    Dobrzański, L. B.
    Achtelik-Franczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351661.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomimetic materials
    CAMD
    scaffolds
    SLM
    Ti6Al4V powders
    SEM
    EDS
    materiały biomimetyczne
    scaffoldy
    selektywne topienie laserowe
    proszki Ti6Al4V
    Opis:
    The aim of the research, the results of which are presented in the paper, is to fabricate, by Selective Laser Melting (SLM), a metallic scaffold with Ti6Al4V powder based on a virtual model corresponding to the actual loss of a patient’s craniofacial bone. A plaster cast was made for a patient with a palate recess, and the cast was then scanned with a 3D scanner to create a virtual 3D model of a palate recess, according to which a 3D model of a solid implant was created using specialist software. The virtual 3D solid implant model was converted into a 3D porous implant model after designing an individual shape of the unit cell conditioning the size and three-dimensional shape of the scaffold pores by multiplication of unit cells. The data concerning a virtual 3D porous implant model was transferred into a selective laser melting (SLM) device and a metallic scaffold was produced from Ti6Al4V powder with this machine, which was subjected to surface treatment by chemical etching. An object with certain initially adopted assumptions, i.e. shape and geometric dimensions, was finally achieved, which perfectly matches the patient bone recesses. The scaffold created was subjected to micro-and spectroscopic examinations.
    Celem badań, których wyniki zaprezentowano w artykule jest wytworzenie, metodą selektywnego topienia laserowego (SLM), scaffoldu metalowego z proszku Ti6Al4V na podstawie wirtualnego modelu odpowiadającego rzeczywistemu ubytkowi kości twarzoczaszki pacjenta. Od pacjenta z ubytkiem podniebienia pobierano wycisk gipsowy, który następnie zeskanowano za pomocą skanera 3D, w celu uzyskania wirtualnego modelu 3D ubytku podniebienia, na podstawie którego z użyciem specjalistycznego oprogramowania utworzono model 3D litego implantu. Po zaprojektowaniu indywidualnego kształtu komórki jednostkowej, determinującej wielkość i trójwymiarowy kształt porów scaffoldu, poprzez multiplikację komórek jednostkowych przekształcono wirtualny model 3D implantu litego w model 3D implantu porowatego. Dane dotyczące wirtualnego modelu 3D implantu porowatego przetransferowano do urządzenia służącego do selektywnego topienia laserowego (SLM) i z użyciem tej maszyny z proszku Ti6Al4V wytworzono metalowy scaffold, który poddano obróbce powierzchniowej poprzez trawienie chemiczne. Finalnie otrzymano obiekt o założonych na wstępie: kształcie i wymiarach geometrycznych, które idealnie odpowiadają ubytkowi kości pacjenta. Wytworzony scaffold poddano badaniom mikro i spektroskopowym.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 1065-1070
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Floredux, MaxCel and Brevis on the yield of apple trees cv. Sampion
    Wpływ preparatów Floredux, MaxCel i Brevis na plon jabłoni odmiany Sampion
    Autorzy:
    Szot, I.
    Lipa, T.
    Dobrzanski jr., B.
    Kaplan, M.
    Baryla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/36099.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Flower or fruitlet thinning is one of the cultural practices used for improving the fruit quality and regulation of yield. The effect of ATS (FloreduX), 6-BA (MaxCel) and metamitron (Brevis) on yield and some fruit characteristics of apple trees cv. Šampion/ M.9 T337 was evaluated. Chemical thinning agents were applied alone, as subsequent spraying or as a tank mixture. Due to the possibility of damage to flowers by the announced frosts, a preparation containing sea algae – Goëmar was added in some treatments. Thinning with only MaxCel resulted in an excessive reduction of the total yield expressed in the number of fruits and their mass, but using MaxCel after flower thinning with Floredux gave very good results. The total yield expressed in kg tree-1 was even bigger than in the control, but the share of fruits with diameter above 7.5 mm was much better. The most promising method of thinning apple trees cv. ‘Szampion’ was the use of MaxCel+Brevis, at fruitlets diameter of 10-12 mm. The yield expressed by the number of apples on a tree was much smaller than in the control, but total yield did not differ from the total yield of the control trees. Apples in this treatment were characterised by the highest mass and length, as well as large diameters. In the fruits of this treatment, there was no significant reduction in flesh firmness relative to the control, and they had the highest dry matter content.
    Wpływ preparatów FloreduX, Maxcel i Brevis na plon jabłoni odmiany Šampion przerzedzanie chemiczne, przerzedzanie ręczne, cytokininy, jakość owoców Przerzedzanie kwiatów lub zawiązków jest jednym z podstawowych zabiegów wykorzystywanych dla poprawy jakości owoców i wielkości plonu. Badano wpływ ATS (FloreduX), 6-BA (MaxCel) i metamitronu (Brevis) na plon i wybrane cechy jakościowe owoców jabłoni odmiany Šampion/ M.9 T337. Przerzedzanie chemiczne wykonano aplikując preparaty w kolejnych zabiegach lub w mieszaninie. Ze względu na niebezpieczeństwo uszkodzeń kwiatów przez zapowiadane przymrozki w niektórych kombinacjach zastosowano dodatkowo preparat zawierający algi – Goëmar. Przerzedzanie z użyciem tylko preparatu MaxCel spowodowało nadmierną redukcję plonu wyrażonego liczbą sztuk na drzewo oraz jego masą. Jednakże użycie preparatu MaxCel po wcześniejszej aplikacji w czasie kwitnienia preparatu Floredux okazało się korzystne. Plon całkowity wyrażony w kg·drzewo–1 był nawet większy niż w kontroli, ale udział owoców o średnicy powyżej 7,5 cm był znaczniejszy. Najkorzystniejszą metodą przerzedzania jabłoni odmiany ‚Šampion’ było zastosowanie MaxCel+Brevis, przy średnicy 10-12 mm. Plon wyrażony liczbą owoców na drzewo był dużo niższy niż w kontroli, ale plon całkowity (kg·drzewo–1) różnił się od kontrolnego. Jabłka w tej kombinacji charakteryzowały się najwyższą masą i długością, jak również średnicą. Ponadto jędrność owoców w tej kombinacji nie obniżyła się istotnie w stosunku do kontroli, a zawartość suchej masy była największa.
    Źródło:
    Acta Agrophysica; 2018, 25, 4
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Dispersion Method on the Microstructure and Properties of MWCNTs/AA6061 Composites
    Autorzy:
    Dobrzański, L. A.
    Macek, M.
    Tomiczek, B.
    Nuckowski, P. M.
    Nowak, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352262.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanocomposites
    powder metallurgy
    mechanical milling
    carbon nanotubes
    aluminium alloys
    Opis:
    The aim of this work was to study the effect of different methods of multi-walled carbon nanotubes (MWCNTs) dispersion, and their influence on the microstructure and properties of aluminium alloy matrix composites produced using the powder metallurgy techniques, such as powder milling/mixing and hot extrusion. The main problem in the manufacturing of nanocomposites is the homogeneous distribution of MWCNTs in the metal matrix. To achieve their proper distribution a high-energy and low-energy mechanical milling, using a planetary ball mill, and mixing, using a turbulent mixer, were applied. Studies have shown that composite materials prepared using milling and extrusion have a much better dispersion of the reinforcing phase, which leads to better mechanical properties of the obtained rods. The low-energy mechanical mixing and mixing using the turbulent mixer neither change the powder morphology nor lead to adequate dispersion of the carbon nanotubes, which directly affects the resulting properties.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1229-1234
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual Life of Boiler Pressure Parts Made of the 13CrMo4-5 Steel after Long-Term Operation in a Creep Conditions
    Autorzy:
    Dziuba-Kałuża, M.
    Zieliński, A.
    Dobrzański, J.
    Sroka, M.
    Urbańczyk, P.
    Śliwa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355671.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    13CrMo4-5 steel
    microstructure
    residual life
    welded joints
    mechanical properties
    Opis:
    This paper presents the method for determination of the time of further safe service for welded joints of boiler components after exceeding the design work time. The evaluation of the life of the parent material and its welded joints was performed. Microstructure investigations using a scanning electron microscope, investigations of strength properties, impact testing, hardness measurements and abridged creep tests of the basic material and welded joints were carried out. The investigations described in this paper allowed the time of further safe service of the examined components made of 13CrMo4-5 steel to be determined. The method for determination of the time of safe service of boiler components working under creep conditions allows their operation beyond the design service life. The obtained results of investigations are part of the materials database developed by the Institute for Ferrous Metallurgy.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 889-897
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper and zinc concentrations in plant and animal raw materials collected in the vicinity of the Zelazny most waste treatment tailings pond
    Autorzy:
    Kolacz, R.
    Spiak, Z.
    Czaban, S.
    Dobrzanski, Z.
    Opalinski, S.
    Kowalska, N.
    Cwynar, P.
    Kupczynski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192611.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    copper
    zinc
    biological raw materials
    Żelazny Most tailings pond
    Opis:
    The study was carried out on the Cu and Zn content of plant material (wheat grain, hay and potato tubers) and animal food products (cow’s milk, hen’s eggs and chicken meat) collected in the vicinity of the Żelazny Most waste treatment tailings pond (Lower Silesia, Poland). The samples for the study accomplished in 2016-2018 were collected from the places located in the nearest vicinity of the tailings pond (6 farms within a distance shorter than 4 km – zone I) and those located further away (6 farms within a distance from 4 to 10 km from the tailings pond – zone II). Copper and Zn concentrations were measured on a Varian Spectra AA220 Fast Sequential atomic absorption spectrophotmeter. The mean values of Cu noted in wheat grain harvested in the years under investigation ranged from 3.87 to 5.27 mg kg-1 DM, while the maximum value was 6.97 mg kg-1 DM. The highest accumulation of Cu and Zn was in hay (max. 10.10 and 99.04 mg kg-1 DM, respectively), while the lowest values were noted in milk and eggs. The zinc content of cow’s milk was found within the range from 2.64 to 4.01 mg kg-1 FM and the highest amount was 6.32 mg kg-1 FM. It was also found the mean Cu concentrations in poultry meat varied from 0.53 to 1.55 mg kg-1 FM and the maximum value was 3.50 mg kg-1 FM. No significant differences between zones I and II were observed (p≤0.05). The current results are comparable with those obtained in 2007 and 2013. With only a few exceptions, the biomonitoring studies did not show that the levels of the two metals in the biological material tested exceeded data reported in the Polish and international literature. Nowadays, there is no reason to consider the Żelazny Most tailings pond to be an toxicological threat to the natural and agricultural environment regarding Cu and Zn, but its periodic biomonitoring is necessary due to the chemical properties of these two elements and their potential effect on some environmental factors.
    Źródło:
    Journal of Elementology; 2020, 25, 4; 1423-1434
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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