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Wyświetlanie 1-15 z 29
Tytuł:
Kinetics of the Fluidised Oxidation of Zinc Sulphide Concentrates with an Addition of Inert Materials
Kinetyka fluidalnego utleniania siarczkowych koncentratów cynku z dodatkiem materiałów obojętnych
Autorzy:
Jarosz, P.
Małecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/353818.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roasting
zinc concentrates
inert materials
oxidation kinetics
prażenie
koncentraty cynku
materiały obojętne
kinetyka utleniania
Opis:
This paper presents the results of the kinetic studies of the zinc sulfide concentrate oxidation with the addition of inert, ZnO-containing materials. It was observed that about 15% of zinc oxide addition, obtained from steelmaking dust, improves the rate and maximum degree of oxidation of the concentrate. Kinetic equations of the process were determined, and the activation energy for various additions of inert material was calculated.
W artykule przedstawiono wyniki badań kinetycznych utleniania koncentratów siarczkowych cynku z dodatkiem materiałów obojętnych, zawierających ZnO. Stwierdzono, że dodatek około 15% tlenku cynku, otrzymanego z recyklingu pyłów stalowniczych, zwiększa szybkość i maksymalny stopień utlenienia koncentratu. Określono równania kinetyczne procesu i energię aktywacji dla różnych dodatków materiału obojętnego.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1367-1372
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermogravimetric Analysis of the Zinc Concentrates Oxidation Containing Various Iron Compounds
Termograwimetryczna analiza utleniania koncentratów cynkowych zawierających różne związki żelaza
Autorzy:
Małecki, S.
Jarosz, P.
Powiązania:
https://bibliotekanauki.pl/articles/356509.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roasting
zinc concentrates
thermal analysis
iron compounds
utlenianie
koncentraty cynku
analiza termiczna
związki żelaza
Opis:
This paper presents the results of oxidation of zinc concentrates containing various iron compounds. Using the thermogravimetry and thermal analysis methods it was shown that the influence of the iron form affects the thermal oxidation process. They influence the rate of, oxidation of zinc sulphide and consequently the resulting rate of oxidation of the concentrate.
W pracy przedstawiono wyniki badań utleniania koncentratów cynku zawierających różne związki żelaza. Wykorzystując metody termograwimetrii i analizy termicznej wykazano wpływ formy występowania żelaza na efekty cieplne utleniania. Rzutują one na szybkość utleniania siarczku cynku i związaną z tym szybkość utleniania koncentratu.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 941-945
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkaline Leaching of Low Zinc Content Iron-Bearing Sludges
Autorzy:
Gargul, K.
Jarosz, P.
Małecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/355782.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sludge
dust
alkaline leaching
Zn recovery
recycling
Opis:
Various types of waste materials containing zinc (e.g. dusts and sludges from gas dedusting process) are obtained in steel industry. The contents of Zn in these materials may vary considerably. Even a low concentration of zinc in recirculated products precludes their recycling in ferrous metallurgy aggregates. Long storage of this type of material can lead to contamination of soil and water by zinc compounds which can be leached out by acid rain, for example. This paper focuses on research involving alkaline leaching tests of low zinc content iron-bearing materials. These tests were preceded by the analysis of the elemental, phase and grain size composition, and analysis of the thermodynamic conditions of the leaching process. The main aim of research was to decrease the content of the zinc in the sludge to the level where it is suitable as an iron-bearing material for iron production (~1% Zn). Leaching at elevated temperatures (368 K, 60 min) has led to a decrease in the zinc content in the sludge of about 66%. The research revealed that long hour leaching (298 K, 100 hours) carried out at ambient temperatures caused a reduction in zinc content by 60% to the value of 1.15-1.2% Zn.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 43-50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Industrial robot repeatability testing with high speed camera Phantom v2511
Autorzy:
Józwik, J.
Ostrowski, D.
Jarosz, P.
Mika, D.
Powiązania:
https://bibliotekanauki.pl/articles/957924.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
diagnostic
accuracy
robots
high speed camera
Opis:
Apart from accuracy, one of the parameters describing industrial robots is positioning accuracy. The parameter in question, which is the subject of this paper, is often the decisive factor determining whether to apply a given robot to perform certain tasks or not. Articulated robots are predominantly used in such processes as: spot welding, transport of materials and other welding applications, where high positioning repeatability is required. It is therefore essential to recognise the parameter in question and to control it throughout the operation of the robot. This paper presents methodology for robot positioning accuracy measurements based on vision technique. The measurements were conducted with Phantom v2511 high-speed camera and TEMA Motion software, for motion analysis. The object of the measurements was a 6-axis Yaskawa Motoman HP20F industrial robot. The results of measurements obtained in tests provided data for the calculation of positioning accuracy of the robot, which was then juxtaposed against robot specifications. Also analysed was the impact of the direction of displacement on the value of attained pose errors. Test results are given in a graphic form.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 86-93
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple sclerosis and pregnancy – treatment considerations
Autorzy:
Kamieniak, M.P.
Wolanin, N.
Jarosz, P.
Kobialka, I.
Kosmider, K.
Petit, V.
Rejdak, K.
Powiązania:
https://bibliotekanauki.pl/articles/2098207.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
multiple sclerosis
chronic inflammatory disease
pregnancy
neurology
gynaecology
treatment
Opis:
Multiple sclerosis is a chronic inflammatory disease which, due to the destruction of the fibres of the central nervous system in the process of demyelination, leads to numerous neurological symptoms and progressive disability. The disease is autoimmune, which means that myelin is destroyed by the patient’s own cells, caused by improper functionong and regulation of the immune system. Multiple sclerosis affects more and more people and is therefore a significant clinical problem which, to a large Entent, affects women, especially in childbearing age This presents a big challenge for carrying out pregnancy while continuing the therapy, ensuring the safety of the foetus and simultaneously achieving the best possible therapeutic effect. The decision whether the therapy should be continued or whether it should be eliminatedis usually made according to assessment of the possible gains and losse. Despite the lack of clear indications, there are many studies proving the relative safety of the use of individual but not all the drugs during pregnancy. Pregnancy, however, has a fairly good impact on the development of multiple sclerosis, and that safety considerations, especially those concerning the growing foetus, force a decision to change or completely suspend the therapy. In-depth research on the already available and emerging therapeutic pathways in multiple sclerosis bring hope for increasingly better results in the future in the treatment of pregnant patients with multiple sclerosis.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2020, 14, 4; 126-129
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagenetic signals from ancient human remains - bioarchaeological applications
Autorzy:
Szostek, K.
Stepańczak, B.
Szczepanek, A.
Kępa, M.
Głąb, H.
Jarosz, P.
Włodarczak, P.
Tunia, K.
Pawlyta, J.
Paluszkiewicz, C.
Tylko, G.
Powiązania:
https://bibliotekanauki.pl/articles/2086542.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
diagenesis
Neolithic
oxygen isotopes
FTIR
EDS
bioarchaeology
Opis:
This preliminary study examines the potential effects of diagenetic processes on the oxygen-isotope ratios of bone and tooth phosphate (δ18O) from skeletal material of individuals representing the Corded Ware Culture (2500–2400 BC) discovered in Malżyce (Southern Poland). Intra-individual variability of Ca/P, CI, C/P, collagen content (%) and oxygen isotopes was observed through analysis of enamel, dentin and postcranial bones. Using a variety of analytical techniques, it was found that, despite the lack of differences in soil acidity, not all the parts of a skeleton on a given site had been equally exposed to diagenetic post mortem changes. In a few cases, qualitative changes in the FTIR spectrum of analysed bones were observed. The data suggest that apart from quantitative analyses, i.e., the calculation of Ca/P, CI, C/P and collagen content, qualitative analyses such as examination of the absorbance line are recommended. The degree to which a sample is, contaminated on the basis of any additional, non-biogenic peaks, deemed to be contaminated should also be specified.
Źródło:
Mineralogia; 2011, 42, 2/3; 93--112
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of changes in depth of cut on surface roughness in machining of AISI 316 stainless steel
Autorzy:
Jarosz, K.
Löschner, P.
Powiązania:
https://bibliotekanauki.pl/articles/99428.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
AISI 316L stainless steel
surface roughness
depth of cut
Opis:
Currently, process optimization is an important part of design of CNC toolpath, allowing overall process improvement in accordance to a range of criteria. Available CAE software for CNC toolpath optimization works only by changing the feed rate value specified in the base toolpath. The authors are planning to devise a solution allowing for optimization of other process parameters, including depth of cut. In some cases, it would be important for surface roughness to remain unaltered after optimization by means of increasing depth of cut. In this work, the effect of depth of cut on surface roughness was investigated. Depth of cut was altered for the roughing pass, while technological parameters for the finish pass remained constant. Roughness measurements were performed on-machine after rough turning and finish turning. The authors have found that depth of cut has a noticeable effect on investigated roughness parameters, both in the case of rough turning and subsequent finish turning operations.
Źródło:
Journal of Machine Engineering; 2018, 18, 1; 72-79
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of changes in depth of cut and cutting speed of CNC toolpaths on turning process performance
Autorzy:
Jarosz, K.
Niesłony, P.
Löschner, P.
Powiązania:
https://bibliotekanauki.pl/articles/94112.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
cutting speed
depth of cut
CNC
cutting force
optimization
prędkość cięcia
głębokość cięcia
siła cięcia
optymalizacja
Opis:
In this article, a novel approach to computer optimization of CNC toolpaths by adjustment of cutting speed vcand depth of cut apis presented. Available software works by the principle of adjusting feed rate on the basis of calculations and numerical simulation of the machining process. The authors wish to expand upon this approach by proposing toolpath optimization by altering two other basic process parameters. Intricacies and problems related totheadjustment of apand vcwere explained in the introductory part. Simulation of different variant of the same turning process with different parameter values were conducted to evaluate the effect of changes in depth of cut and cutting speed on process performance. Obtained results were investigated on the account of cutting force and tool life. The authors have found that depth of cut substantially affects cutting force, while the effect of cutting speed on it is minimal. An increase in both depth of cut and cutting speed affects tool life negatively, although the impact of cutting speed is much more severe. An increase in depth of cut allows for a more significant reduction of machining time, while affecting tool life less negatively. On the other hand, the adjustment of cutting speed helpsto reduce machining time without increasing cutting force component values and spindle load.
Źródło:
Archives of Mechanical Technology and Materials; 2018, 38; 40-44
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise Measurements of the Hyperfine Structure of the Levels Belonging to the Terms $3d^{5}4s$ $\text{}^{5}G$ and $\text{}^{5}P$ in $Cr(I)$
Autorzy:
Krzykowski, A.
Głowacki, P.
Jarosz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1419711.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.10.Fn
Opis:
The hyperfine structure intervals for the electronic levels belonging to the terms $3 d^5 (\text{}^4G) 4s a^5G$ and $a^5P$ of a chromium 53 atom were precisely measured with the use of the method of atomic beam magnetic resonance detected by laser induced resonance fluorescence. Magnetic-dipole and electric-quadrupole hyperfine interaction constants (A and B, respectively) for the electronic levels of interest were determined with the accuracy of a few kHz. The high precision of measurements also enabled an estimation of the octupole-coupling constants (C).
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 78-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of CNC face milling process of Al-6061-T6 aluminum alloy
Autorzy:
Jarosz, K.
Löschner, P.
Niesłony, P.
Krolczyk, G.
Powiązania:
https://bibliotekanauki.pl/articles/99717.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
aluminum alloys
CNC
face milling
optimization
Opis:
In modern machining industry, the use of computer software is an integral element in the design of technological processes. This work aims to present possibilities for optimization of milling operations with the use of commercial software designed especially for that use. A face milling operation of an aluminium flange was chosen for this study. Several different optimization strategies were described and their results shown, analysed and discussed. The effect of variable radial depth of cut on cutting force values in milling processes was reflected upon. Additionally, further research involving comparison of experiment results with simulation was proposed. It was proven that correct optimization strategy can reduce machining time for the analysed face milling operation about 37% without exceeding imposed process parameter constraints.
Źródło:
Journal of Machine Engineering; 2017, 17, 1; 69-77
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Importance of legal regulations resulting from technical harmonization in the European Union for improvement of work safety of farmers in Poland
Autorzy:
Żywicka, A.
Choina, P.
Jarosz, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/28762751.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 3; 378-384
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diabetes and depression: a combination of civilization and life-style diseases is more than simple problem adding - literature review
Autorzy:
Dziemidok, P,
Makara-Studzinska, M.
Jarosz, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/52014.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Tematy:
human disease
diabetes
depression
life style
complication
patient
treatment
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Surveying Inventory of Kraków-Częstochowa Upland’s Rocks Illustrated with the Example of the Hercules’ Club (Maczuga Herkulesa) in Pieskowa Skała
Geodezyjna inwentaryzacja ostańców jurajskich na przykładzie Maczugi Herkulesa w Pieskowej Skale
Autorzy:
Ćwiąkała, P.
Puniach, E.
Jarosz, M.
Kmak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1510651.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
naziemny skaning laserowy
inwentarazycja pomników przyrody nieożywionej
ostańce
terrestrial laser scanning
inventory of monuments of inanimate nature
monadnocks
Opis:
Artykuł omawia proces tworzenia trójwymiarowego modelu ostańca jako metody inwentaryzacji pomników przyrody nieożywionej. Przedmiotem badań był jeden z najbardziej znanych pomników przyrody nieożywionej w Polsce, jakim jest Maczuga Herkulesa znajdująca się w Ojcowskim Parku Narodowym. Model 3D skałki powstał na podstawie danych geometrycznych, które pozyskano przy wykorzystaniu naziemnego skaningu laserowego (TLS). Technologia ta jest z powodzeniem stosowana między innymi do dokumentacji zabytków, zarówno pochodzenia antropogenicznego (budowli, dzieł sztuki), jak i pomników przyrody. W celu stworzenia modelu Maczugi Herkulesa zaplanowano i przeprowadzono pomiar skanerem laserowym Leica Scan-Station C10. Dodatkowo podczas prac terenowych założono i pomierzono osnowę geodezyjną przy wykorzystaniu metody tachimetrycznej i satelitarnej. Miało to na celu dokładne zlokalizowanie obiektu w państwowym systemie odniesień przestrzennych oraz późniejsze nadanie punktom modelu współrzędnych w geodezyjnych układach odniesienia. Prace kameralne obejmowały stworzenie modelu 3D ostańca na podstawie pozyskanej chmury punktów reprezentującej cały obiekt. Wynikowa chmura punktów i utworzony model 3D mogą w przyszłości służyć jako dane pierwotne potrzebne do badania okresowych zmian geometrii ostańca. W artykule wykazano, że zastosowana metodyka pozyskiwania danych przestrzennych przy wykorzystaniu naziemnego skaningu laserowego pozwala na zarówno szybkie, jak i wierne odwzorowanie geometrii rzeczywistego obiektu w postaci trójwymiarowego modelu numerycznego.
This article discusses the process of creating a three-dimensional model of a rock as an inventory method of inanimate nature monuments. The subject of the research was one of the best-known monuments of inanimate nature in Poland, namely the Maczuga Herkulesa situated in the Ojcowski National Park. The 3D model of the rock was created on the basis of geometric data which was acquired with the usage of Terrestrial Laser Scanning. This technology has been successfully applied, among others things, to document monuments, both of anthropogenic (buildings, works of arts) and natural origin. In order to create a model of the Maczuga Herkulesa rock, the measurements by means of Leica ScanStation C10 laser scanner was planned and conducted. Additionally, a control network was created and measured during field works by means of tacheometric and satellite methods. It was aimed at the precise localisation of the object in the National Spatial Reference System, as well as at marking the points of the model with coordinates in the current reference systems. The analysis included the creation of a 3D model of the rock on the basis of the obtained point cloud representing the whole object. In the future, the point cloud and the created 3D model can serve as initial data, which are necessary in order to define periodic changes in monadnock geometry. It was proved in the article that the applied method of acquiring spatial data by means of terrestrial laser scanning enables both fast and accurate transfer of the real object’s geometry to a three-dimensional numeric model.
Źródło:
Geomatics and Environmental Engineering; 2015, 9, 1; 15-23
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of the Manufacturing of Aluminum Casting Alloys with Hypoeutectic Aluminum Silicon Group
Autorzy:
Knych, T.
Uliasz, P.
Wiecheć, J.
Paśko, J.
Jarosz, R.
Powiązania:
https://bibliotekanauki.pl/articles/379927.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting aluminium alloys
hypoeutectic silumins
heat treatment
odlew ze stopów aluminium
silumin podeutektyczny
obróbka cieplna
Opis:
Aluminum alloys are one of the most popular casting materials. Their enormous popularity due to a wide set of desired material properties such as high strength properties, low thermal expansion coefficient, high thermal and electrical conductivity, very good casting properties, including castability. The most common group of cast aluminum alloys are silumins, where the main alloy addition is silicon. Al-Si alloys are mainly used in the transport industry and construction applications. Another area of applications using this group of materials is the electrical and power engineering industry, where the crucial meaning has the correlation of two types of properties: electrical and mechanical. This paper presents the influence of alloying elements on the electrical properties and mechanical properties of materials undergoing heat treatment. Heat treatment include solution heat treatment and next aging or overaging. Electrical properties represents the electrical conductivity tested by eddy current method. Mechanical properties are in turn represented by the results of measurements of Brinell hardness. Tests include three alloys belong to hypoeutectic silumins group with silicon content in the range of 4,5 to 7 wt%. Si.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 103-108
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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