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Wyświetlanie 1-15 z 1880
Tytuł:
Comparison of the Emission of Aromatic Hydrocarbons from Moulding Sands with Furfural Resin with the Low Content of Furfuryl Alcohol and Different Activators
Autorzy:
Żymankowska-Kumon, S.
Bobrowski, A.
Grabowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/382179.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
moulding sand
furfuryl resin
aromatic hydrocarbons
BTEX
ochrona środowiska
masa formierska
żywica furfurylowa
węglowodory aromatyczne
Opis:
No-bake process refers to the use of chemical binders to bond the moulding sand. Sand is moved to the mould fill station in preparation for filling of the mould. A mixer is used to blend the sand with the chemical binder and activator. As the sand exits the mixer, the binder begins the chemical process of hardening. This paper presents the results of decomposition of the moulding sands with modified urea-furfuryl resin (with the low content of furfuryl alcohol below 25 % and different activators: organic and inorganic) on a quartz matrix, under semi-industrial conditions. Investigations of the gases emission in the test foundry plant were executed according to the method extended in the Faculty of Foundry Engineering (AGH University of Science and Technology). Article presents the results of the emitted chosen aromatic hydrocarbons and loss on ignition compared with the different activators used to harden this resin. On the bases of the data, it is possible to determine the content of the emitted dangerous substances from the moulding sand according to the content of loss on ignition.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 187-190
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Silicate Modifier on the Emission of Harmful Compounds from Phenolic Resin used in Cold-Box Technology
Autorzy:
Żymankowska-Kumon, S.
Bobrowski, A.
Drożyński, D.
Grabowska, B.
Kaczmarska, K.
Powiązania:
https://bibliotekanauki.pl/articles/380640.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
aromatic hydrocarbons
phenolic resin
emission
Cold-Box technology
ochrona środowiska
węglowodory aromatyczne
żywica fenolowa
emisja
technologia Cold-Box
Opis:
In many foundries, the requirements placed on castings production have risen mainly over the few years. Further trends in recent years have been the ever increasing level of automation and introduction of new alloys, especially composites. On the other hand, the foundry environment has become increasingly difficult because is used many organic binders. Environmental regulations will be further tightened up. These processes are pursued at national, European and global level. Conformity with emission limits is becoming increasingly difficult. The problem is emission of aromatic hydrocarbons, phenol, odours and other harmful compounds to environment. The main purpose of many companies is reduction of this toxins. The new cold-box systems (based on phenolic resins) try to reduce the emission by introducing into the resin structure silicate modifiers. Research presented of this article evaluate the effectiveness of these methods. The results show comparison of two resins ("without" and "with" silicate modifier) for assessment of emission of harmful aromatic hydrocarbons and phenol.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 151-156
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Atmosphere on the Type of Evolved Gases from Phenolic Binders
Autorzy:
Żymankowska-Kumon, S.
Kaczmarska, K.
Grabowska, B.
Bobrowski, A.
Cukrowicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/383144.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
resin
emission
atmosphere
thermal analysis
ochrona środowiska
żywica
emisja
atmosfera
analiza termiczna
Opis:
The problem of harmful casting resins has been present in foundries for many years. Manufacturers are introducing new products that contain in their composition environmentally and eco-friendly ingredients. Unfortunately, not all types of technology can be used, sometimes environmental benefits are disproportionate to the quality of castings and their price. In the foundry industry, the most popular binders are based on organic compounds (often carcinogenic) and other harmful substances. Due to strict legal regulations regarding environmental protection, as well as care for the foundry's workers' comfort - their occurrence should be reduce to a minimum. These compounds often behave also depending on the conditions of use (temperature, atmosphere). The application of various methods of thermal analysis and spectroscopic methods allows to verify the mechanism of resin decomposition process in relation to conditions in the form in both inert and oxidizing atmosphere. For analysis the resins from cold-box technology, were used TG–DTG–DSC, Py-GC/MS methods and specified the course of changes occurring in combination of different atmosphere.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 31-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of bolt joint using the finite element method
Analiza połączenia kołnierzowego metodą elementów skończonych
Autorzy:
Żyliński, B.
Buczkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/139858.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
połączenie kołnierzowe
specjalne elementy skończone
charakterystyki sztywnościowe
bolt joint
special finite elements
stiffness characteristics
Opis:
A numerical analysis of the initially clamped bolt joint subject to the working pressure is presented in the paper. Special, hexahedral 21- and 28-node isoparametric finite elements have been employed to model the contact zone. In this model, one takes into account loading due to the working pressure in the gap between the gasket and the flange arising as an effect of the progressing joint opening, what has not been considered in recent papers. Nonlinear stiffness characteristics of the bolt and the flange with the gasket are developed. Working pressure corresponding to the critical bolt force resulting in the joint leakage (complete opening between the gasket and the flange) is determined. FE computational results are compared with the available experimental results. The numerical results are presented using the authors' own graphical postprocessor.
W pracy przedstawiono numeryczną analizę połączenia kołnierzowego z uszczelką obciążonego zaciskiem wstępnym i ciśnieniem roboczym. W strefie kontaktu pomiędzy uszczelką a kołnierzem zastosowano specjalne przestrzenne 21- i 28-węzłowe izoparametryczne elementy skończone. W modelu obliczeniowym uwzględniono również obciążenie od ciśnienia roboczego panującego w szczelinie pomiędzy uszczelką a kołnierzem w wyniku postępującego otwarcia połączenia, co jest pewną nowością w porównaniu do najnowszych prac opublikowanych z tej tematyki. Sporządzono nieliniowe charakterystyki sztywnościowe śruby i kołnierza z uszczelką. Określono wartość ciśnienia roboczego odpowiadającego sile krytycznej w śrubie powodującego przeciek w połączeniu (całkowite otwarcie pomiędzy uszczelką a kołnierzem). Wyniki obliczeniowe MES porównano z dostępnymi wynikami doświadczalnymi. Wyniki numeryczne zilustrowano przy pomocy własnego postprocesora graficznego.
Źródło:
Archive of Mechanical Engineering; 2010, LVII, 3; 275-292
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and experimental research of supersonic missile ballistics
Autorzy:
Zygmunt, B.
Motyl, K.
Machowski, B.
Makowski, M.
Olejniczak, E.
Powiązania:
https://bibliotekanauki.pl/articles/201046.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
missile exterior ballistics
mathematical model
computer simulation
test range experiment
pociski balistyczne
model matematyczny
symulacja komputerowa
Opis:
A mathematical-physical model of a supersonic missile was built, taking into account the mass and inertia properties. The model was implemented in the MathCAD14 simulation program. A numerical analysis of the missile ballistics was conducted and basic parameters were determined: range, altitude, velocity and acceleration, which enabled a test range program for manufactured missile models to be drawn up. Initial flight tests of missiles were carried out at the test range. Satisfactory accordance of experimental and theoretical dynamic parameters of the missile under study was obtained.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 229-233
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of the power conditioning system with a five-level cascaded converter and supercapacitor energy storage
Autorzy:
Zygmanowski, M.
Grzesik, B.
Michalak, J.
Powiązania:
https://bibliotekanauki.pl/articles/200041.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cascaded H-bridge multilevel converters
power conditioning system
power quality
Opis:
The paper presents the power conditioning system (PCS) with a five-level cascaded H-bridge converter and supercapacitor energy storage. The paper focuses on such properties of a power electronic converter as its operation, power losses, start-up as well as the DC-link voltage balancing method and controller. A laboratory model of the PCS and its test results have been presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 525-540
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected aspects of Modular Multilevel Converter operation
Autorzy:
Zygmanowski, M.
Grzesik, B.
Fulczyk, M.
Nalepa, R.
Powiązania:
https://bibliotekanauki.pl/articles/201376.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modular multilevel converter
MMC
power electronic converter modeling
Opis:
The operation of the Modular Multilevel Converter (MMC) is the main subject of this paper. Selected operation aspects are discussed on the basis of the averaged model, with a special focus on power section parameters and control. The direct modulation method has been chosen for the control of the MMC.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 375-385
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of change in the structure of distribution system on incurred cost
Autorzy:
Zwolińska, B.
Michlowicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/223508.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distribution structure
cargo flow process
cost model
supply chain
struktura dystrybucji
procesy przepływu ładunków
model kosztowy
łańcuch dostaw
Opis:
In multi-tier distribution, in addition to suppliers and consumers there are also intermediaries who participate in the transfer of products from manufacturers to end consumers. The choice of the distribution system depends on the optimisation of the performance indicators for servicing an area, taking into account the technical capabilities of the individual logistics chain links. The paper compares two typical distribution structures in the construction sector. The choice of the structure is a function of the manufacturer’s economic and organisational determinants. The paper presents a model representing the costs of two typical distribution structures in the construction sector. The choice of the structure depends on the company’s outsourcing policy and total costs of all three major system components: the distribution network, transport network, and warehousing. Rationally built and implemented functioning models are a key element of business success in the marketplace. The choice of a suitable strategy is difficult, as it depends on many dynamically changing parameters which directly affect costs. In addition, the relations between the system elements are very complex and interdependent.
Źródło:
Archives of Transport; 2016, 39, 3; 87-94
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of porcine epidemic diarrhea virus infection on tight junction protein gene expression and morphology of the intestinal mucosa in pigs
Autorzy:
Zong, Q.F.
Huang, Y.J.
Wu, L.S.
Wu, Z.C.
Wu, S.L.
Bao, W.B.
Powiązania:
https://bibliotekanauki.pl/articles/2087524.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pig
tight junction protein
PEDV
diarrhea
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 345-353
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Explosive Welding Possibilities by the Use of Emulsion Explosive
Rozwój możliwości łączenia wybuchowego przez użycie emulsji wybuchowych
Autorzy:
Zlobin, B.
Silvestrov, V. V.
Shtertser, A.
Plastinin, A.
Kiselev, V.
Powiązania:
https://bibliotekanauki.pl/articles/357048.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosive welding
emulsion explosive
carbide composite
bonding formation
zgrzewanie wybuchowe
emulsja wybuchowa
kompozyt węglika
spajanie klejowe
Opis:
Explosive welding is an effective method of joining of various metals and alloys. However, when the materials with very different strength and thermo-physical properties are welded or thin-layer cladding is performed, the difficulties occur which call for extra investigations. In the present paper, with the couples of steel / carbide composite and copper / hardened steel used as examples, under study were the peculiarities of bonding formation by the explosive welding of metals with highly differing properties. The experiments were carried out with emulsion explosive containing hollow micro-spheres and detonating in thin layers with the low (2 - 3 km/s) detonation velocity. Obtained results show that the emulsion explosives enable to extend the explosion welding potentiality.
Połączenie wybuchowe jest wydajną metodą łączenia silnie zróżnicowanych metali i stopów. Jednakże, pojawiają się realne trudności w łączeniu, gdy jeden z materiałów posiada bardzo odmienne właściwości wytrzymałościowe lub termo-fizyczne bądź też wytwarzane jest połączenie bardzo cienkich folii. W niniejszej pracy, badano przykładowe: stal/węglik oraz miedź/stal hartowana, jako układy materiałów o silnie zróżnicowanych własnościach spajanych z wykorzystaniem metod wybuchowych. Badania eksperymentalne wykonano z użyciem emulsji wybuchowych zawierających wydrążone mikrosfery oraz układy złożone z cienkich warstw. Proces łączenia wykonywano z wykorzystaniem małych prędkości detonacji (2-3 km/s). Otrzymane rezultaty pokazują, że zastosowanie emulsji wybuchowych znacznie poszerza potencjalny zakres możliwości wykorzystania techniki spajania wybuchowego.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1587-1592
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of unsteady forces acting on a slender cylinder
Autorzy:
Ziółkowski, P. J.
Witkowski, W.
Sobczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/175172.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unsteady flow
FSI
CFD modelling
CSD modelling
Opis:
Developments in construction engineering (new materials, construction techniques) facilitate the design of very flexible, light structures with low damping which unfortunately results in higher susceptibility of these structures to wind action. It is therefore necessary to use more accurate scientific tools in the engineering phase of these structures. Analytical methods for considering wind effects on structures encounter difficulties with respect to mathematical formulations of aerodynamic forces. In this paper a 2D numerical model has been described which considers the fluid domain with respect to a cylindrical obstacle. This 2D model has been discretized using the finite volume method, and numerical simulations have been undertaken in order to describe the unsteady flow conditions within the analyzed domain. The simulations have been performed with boundary conditions characterizing the flow past a cylindrical obstacle. The results have been compared with the literature data from similar experiments. On the basis of the flow characteristics obtained, as well as the spatial distributions of the flow parameters, a model for further 3D analyses was selected. Next, a 3D numerical study of unsteady flow forces acting on a slender cylinder has been analyzed. Toward the end, a two-way fluid solid interaction approach has been utilized, which incorporates a computational fluid dynamics approach combined with computational solid dynamics.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2018, 140; 23-38
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neuropeptide Y as a presynaptic modulator of norepinephrine release from the sympathetic nerve fibers in the pig pineal gland
Autorzy:
Ziolkowska, N.
Lewczuk, B.
Przybylska-Gornowicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/30183.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Norepinephrine (NE) released from the sympathetic nerve endings is the main neurotransmitter controlling melatonin synthesis in the mammalian pineal gland. Although neuropeptide Y (NPY) co-exists with NE in the pineal sympathetic nerve fibers it also occurs in a population of non-adrenergic nerve fibers located in this gland. The role of NPY in pineal physiology is still enigmatic. The present study characterizes the effect of NPY on the depolarization-evoked 3H-NE release from the pig pineal explants. The explants of the pig pineal gland were loaded with 3H-NE in the presence of pargyline and superfused with Tyrode medium. They were exposed twice to the modified Tyrode medium containing 60 mM of K+ to evoke the 3H-NE release via depolarization. NPY, specific agonists of Y1- and Y2-receptors and pharmacologically active ligands of a2-adrenoceptors were added to the medium before and during the second depolarization. The radioactivity was measured in medium fractions collected every 2 minutes during the superfusion. NPY (0.1 - 10 μM) significantly decreased the depolarization-induced 3H-NE release. Similar effect was observed after the treatment with Y2-agonist: NPY13-36, but not with Y1-agonist: [Leu31,Pro34]-NPY. The tritium overflow was lower in the explants exposed to the 5 μM NPY and 1 μM rauwolscine than to rauwolscine only. The effects of 5 μM NPY and 0.05 μM UK 14,304 on the depolarization-evoked 3H-NE release were additive. The results show that NPY is involved in the regulation of NE release from the sympathetic terminals in the pig pineal gland, inhibiting this process via Y2-receptors.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Markers of physiological stress in common pea (Pisum sativum) in response to soil contamination with tetracycline
Autorzy:
Ziolkowska, A.
Dobiesz, M.
Piotrowicz-Cieslak, A.I.
Adomas, B.
Powiązania:
https://bibliotekanauki.pl/articles/80121.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
physiological stress
common pea
Pisum sativum
soil contamination
tetracycline
peroxidase activity
carbohydrate
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phoneme Segmentation Based on Wavelet Spectra Analysis
Autorzy:
Ziółko, B.
Manandhar, S.
Wilson, R. C.
Ziółko, M.
Powiązania:
https://bibliotekanauki.pl/articles/177480.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speech recognition
speech segmentation
discrete wavelet transform
Opis:
A phoneme segmentation method based on the analysis of discrete wavelet transform spectra is described. The localization of phoneme boundaries is particularly useful in speech recognition. It enables one to use more accurate acoustic models since the length of phonemes provide more information for parametrization. Our method relies on the values of power envelopes and their first derivatives for six frequency subbands. Specific scenarios that are typical for phoneme boundaries are searched for. Discrete times with such events are noted and graded using a distribution-like event function, which represent the change of the energy distribution in the frequency domain. The exact definition of this method is described in the paper. The final decision on localization of boundaries is taken by analysis of the event function. Boundaries are, therefore, extracted using information from all subbands. The method was developed on a small set of Polish hand segmented words and tested on another large corpus containing 16 425 utterances. A recall and precision measure specifically designed to measure the quality of speech segmentation was adapted by using fuzzy sets. From this, results with F-score equal to 72.49% were obtained.
Źródło:
Archives of Acoustics; 2011, 36, 1; 29-47
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1880

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