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    Wyświetlanie 1-15 z 15
    Tytuł:
    The Problem of Airflow Around Building Clusters in Different Configurations
    Autorzy:
    Jędrzejewski, M.
    Poćwierz, M.
    Zielonko-Jung, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139849.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental wind engineering
    airflow around buildings
    damage mechanics
    CFD simulation
    k-ε realizable model of turbulence
    RSM model of turbulence
    inżynieria wiatrowa
    przepływ powietrza wokół budynków
    mechanika uszkodzeń
    symulacja obliczeniowej dynamiki płynów CFD
    model turbulencji k-ε realizable
    model turbulencji RSM
    Opis:
    In the paper, the authors discuss the construction of a model of an exemplary urban layout. Numerical simulation has been performed by means of a commercial software Fluent using two different turbulence models: the popular k-ε realizable one, and the Reynolds Stress Model (RSM), which is still being developed. The former is a 2-equations model, while the latter – is a RSM model – that consists of 7 equations. The studies have shown that, in this specific case, a more complex model of turbulence is not necessary. The results obtained with this model are not more accurate than the ones obtained using the RKE model. The model, scale 1:400, was tested in a wind tunnel. The pressure measurement near buildings, oil visualization and scour technique were undertaken and described accordingly. Measurements gave the quantitative and qualitative information describing the nature of the flow. Finally, the data were compared with the results of the experiments performed. The pressure coefficients resulting from the experiment were compared with the coefficients obtained from the numerical simulation. At the same time velocity maps and streamlines obtained from the calculations were combined with the results of the oil visualisation and scour technique.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 401-418
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On monotonicity of real functions
    Autorzy:
    Jędrzejewski, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/121651.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    monotoniczność funkcji
    funkcje rzeczywiste
    funkcje ciągłe
    monotonicity of functions
    real functions
    continuous functions
    Opis:
    Monotonicity of functions were of great interest of many mathematicians. Starting from the well known theorem of monotonicity of a differentiable function one can get quite sophisticated results. We give a survey of results when thesis of them is continuous and monotone function. Someone can ask why it should be continuous. Even a differentiable functions but not at the only point of its domain with positive derivative need not be non-decreasing. That is why we want to look for theorems for continuous functions.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2017, 22; 49-60
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry in real functions theory
    Autorzy:
    Jędrzejewski, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/950241.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    real functions
    real functions theory
    asymmetry
    funkcje rzeczywiste
    teoria funkcji rzeczywistych
    asymetria
    Opis:
    Since the beginning of the XX century many authors considered characterizations of local properties for real functions of a real variable which have been defined as global properties. We present a short survey of local properties of the well known global ones and consider of how small/big the set of asymmetrical behaviour of a function must be.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2018, 23; 11-24
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mistake in definition of a limit of a function and some consequences
    Autorzy:
    Jędrzejewski, J. M.
    Kostrzewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/121723.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    edukacja matematyczna
    nauczanie matematyki
    funkcje rzeczywiste
    błąd
    mathematical education
    teaching mathematics
    real functions
    mistake
    Opis:
    Many times our students make some errors in definitions, especially when we must apply some quantifiers. The definition of a limit is one of the definition with many quantifiers, so one can observe many mistakes in it. We want to present one of possible mistakes and show how to improve the understanding of this difficult but one of most important notions.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 61-65
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of two FEA-based approaches in prediction of workpiece-fixture static behaviour
    Autorzy:
    Grochowski, M.
    Jedrzejewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429289.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    workpiece
    fixture
    quasistatic analysis
    Opis:
    Simulating of workpiece and fixture behaviour is commonly done with the use of Finite Element Analyses. In the most, if not all, cases researchers usually use traditional implicit integration scheme FEM codes (e.g. ANSYS, ABAQUS/Standard, NASTRAN, FEAP). In this paper a different approach is proposed. FEM code of ABAQUS/Explicit, based on explicit integration of equations of the motion is used to predict workpiece behaviour during alignment and fixing process in quasistatic state. Comparison of results obtained using both implicit and explicit techniques is also presented, results and differences are discussed.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 3; 54-65
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Divisibility and its application in teaching mathematics in the third educational level
    Autorzy:
    Jędrzejewski, J.
    Ziółkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/121670.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    edukacja matematyczna
    nauczanie matematyki
    zadania matematyczne
    uczeń
    gimnazjum
    mathematical education
    teaching mathematics
    mathematical tasks
    pupil
    gymnasium
    Opis:
    Elements of theory of divisibility are present in many various interesting mathematical tasks, especially in tasks that are addressed to talented pupils taking part in mathematical competitions. Good understanding of it lets solve very interesting and difficult (at first glance) issues. On the other hand, there are a lot of problems with understanding such terms as: multiple, divisor, divisibility, prime number, LCM, GCD etc. The purpose of the article is presenting the base terms of theory in the language understood for pupil of the gymnasium (3-rd educational level, 13-16 years old). In addition, we present some algorithms that are used to solve problems from the theory of divisibility and we discuss the influence the choice of the algorithm on its effectiveness (so we analyse its complexity). Presented algorithms let us create computer programs that solve the problems mechanically. We also enlarge a bit some topics for those ones which can be taught in the class of pupils which are interested in Mathematics.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 71-82
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid Modelling of Machine Tool with Integrated Cooling System
    Autorzy:
    Bukowski, A.
    Grochowski, M.
    Jedrzejewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/971101.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    mechatronic model
    machine tool
    cooling system
    Opis:
    In this paper, a method of hybrid modelling of machine's mechanic structure together with mechatronic cooling system of its body is presented. In this method, a FEM model, traditionally used for thermal analyses of machine's thermal behaviour, has been integrated with mechatronic model of cooling system, implemented in MATLAB. In such way, a hybrid model has been created, allowing to simulate the control of machine body cooling process. Applied simulation of cooling the region of body, adjacent to the guide, illustrates the possibility of controlling the temperature in chosen points of the machine tool, in transient state, which would ensure minimal body deformations, small enough not to require compensation, which is generally hard and of limited precision. Thermal model of machine tool has been built with the use of SATO system [1]. In this work, time-domain temperature changes with and without the use of regulation by means of PID regulator have been compared. Results of the simulation show the usefulness of presented hybrid modelling method for the improvement of machine tool thermal behaviour.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 1; 84-93
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A device for the experimental investigation of surface contact under load
    Autorzy:
    Maciołka, P.
    Jędrzejewski, J.
    Grochowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/99403.pdf
    Data publikacji:
    2014
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    contact mechanics
    asperity deformation
    measurement
    Opis:
    The structure of a device for the investigation of the contact deformations of flat surfaces under normal load is described. The conditions, for which the device must satisfy in order to ensure normal load are defined. Errors which may occur during the loading of a rough specimen, relating to the mechanical structure of the device, the specimen itself and the measuring systems, are estimated. Finally, the device is subjected to testing which includes specimen roughness measurements before and after loading, the loading and unloading of the specimens in the device and again measuring their roughness. The device developed herein can be characterisedby its vacuum mounting method of the specimen and also by the accurate and simple loading mechanism, i.e., movable member.
    Źródło:
    Journal of Machine Engineering; 2014, 14, 3; 97-112
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design analysis of Tesla micro-turbine operating on a low-boiling medium
    Autorzy:
    Lampart, P.
    Kosowski, K.
    Piwowarski, M.
    Jędrzejewski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/259365.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Tesla turbine
    axial flow bladed turbine
    flow efficiency
    CFD calculations
    RANS model
    Opis:
    This paper presents results of the design analysis of a Tesla bladeless turbine intended for a co-generating micro-power plant of heat capacity 20 kW, which operates in an organic Rankine cycle on a low-boiling medium. Numerical calculations of flow in several Tesla turbine models were performed for a range of design parameters. Results of investigations exhibit interesting features in the distribution of flow parameters within the turbine interdisk space. The calculated flow efficiency of the investigated Tesla turbine models show that the best obtained solutions can be competitive as compared with classical small bladed turbines.
    Źródło:
    Polish Maritime Research; 2009, S 1; 28-33
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep tissue massage and flexibility in the structural components of the superficial back line of professional volleyball players: a pilot study.
    Autorzy:
    Steuer, M.
    Jędrzejewski, G.
    Dolibog, P.
    Kasper-Jędrzejewska, M.
    Mroczek, A.
    Kaczorowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2088234.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Tematy:
    deep tissue massage
    superficial back line
    volleyball players
    Opis:
    Background: Massage is a common treatment in physiotherapy, often used as a prophylaxis or during recovery following a musculoskeletal contusion. One form of therapeutic massage is deep tissue massage (DTM), which has become more popular in recent years as a way of performing targeted work with the myofascial system. Aim of the study: The aim of the study was to examine the effectiveness of deep tissue massage on superficial back line flexibility (hip flexion and knee extension range of motion – ROM). Material and methods: Elite volleyball players (n=15), age: 22.8 ± 4.41 years; mass: 82.67 ± 6.99 kg; height: 1.96 ± 0.08 m) were recruited for this study. Deep tissue massage of the myofascial superficial back line was performed from the plantar fascia through the gastrocnemius and soleus muscles, the hamstrings to the ischial tuberosity (based on Myers, 2014). Hip flexion and knee extension ROM were measured at rest both before and after DTM. The Wilcoxon signed-rank test was used to compare pre and post values during the intervention. Results: Following deep tissue massage, there was significant improvement in superficial back line flexibility, demonstrated by an increase in hip flexion angle compared to pre-DTM values in both lower limbs. Right lower limb pre-DTM 1.86±0.66; post 2.79±0.43 (p<0.005), left lower limb pre-DTM 2.36±0.74; post 2.79±0.43 (p<0.028). There was also significant improvement in superficial back line flexibility demonstrated by an increase in knee extension angle post-DTM in both lower limbs. Right lower limb pre-DTM 69.79°±10.8; post 81.43°±6.06, left lower limb pre-DTM 73.07°±11.45, post 82.50°±8.39). Conclusions: Deep tissue massage increases the flexibility of the superficial back line and can be used as a form of increasing range of motion in the hips and knees.
    Źródło:
    Medical Science Pulse; 2019, 13, 3; 29-34
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarimetric and Bragg Optical Fiber Sensors for Stress Distribution and Temperature Measurements in Composite Materials
    Autorzy:
    Lesiak, P.
    Szeląg, M.
    Mileńko, K.
    Woliński, T.
    Domański, A.
    Jędrzejewski, K.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493251.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    Composite structures are made from two or more constituent materials with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows us for introducing an optical fiber sensors matrix into the composite material. These sensors can demonstrate stress distribution inside a tested material influenced by external tensions. Two types of the optical fiber sensors, placed into one fiber simultaneously, are used as s matrix structure. One of them is based on application of the Bragg grating structure written inside the core of the fiber. Longitudinal stress modifies changes parameters of the Bragg grating and in the same, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which under external stress introduce polarization changes in the output light. These sensors placed into one fiber give a possibility to the measure two external tensions separately.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 698-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The utilization of the mesoporous Ti-SBA-15 catalyst in the epoxidation of allyl alcohol to glycidol and diglycidyl ether in the water medium
    Autorzy:
    Wróblewska, A.
    Makuch, E.
    Dzięcioł, M.
    Jędrzejewski, R.
    Kochmański, P.
    Kochmańska, A.
    Kucharski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/777977.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    glycidol
    diglycidyl ether
    Ti-SBA-15 catalyst
    allyl alcohol epoxidation
    hydrogen peroxide
    Opis:
    This work presents the studies on the optimization the process of allyl alcohol epoxidation over the Ti-SBA-15 catalyst. The optimization was carried out in an aqueous medium, wherein water was introduced into the reaction medium with an oxidizing agent (30 wt% aqueous solution of hydrogen peroxide) and it was formed in the reaction medium during the processes. The main investigated technological parameters were: the temperature, the molar ratio of allyl alcohol/hydrogen peroxide, the catalyst content and the reaction time. The main functions the process were: the selectivity of transformation to glycidol in relation to allyl alcohol consumed, the selectivity of transformation to diglycidyl ether in relation to allyl alcohol consumed, the conversion of allyl alcohol and the selectivity of transformation to organic compounds in relation to hydrogen peroxide consumed. The analysis of the layer drawings showed that in water solution it is best to conduct allyl alcohol epoxidation in direction of glycidol (selectivity of glycidol 54 mol%) at: the temperature of 10–17°C, the molar ratio of reactants 0.5–1.9, the catalyst content 2.9–4.0 wt%, the reaction time 2.7–3.0 h and in direction of diglycidyl ether (selectivity of diglycidyl ether 16 mol%) at: the temperature of 18–33°C, the molar ratio of reactants 0.9–1.65, the catalyst content 2.0–3.4 wt%, the reaction time 1.7–2.6 h. The presented method allows to obtain two very valuable intermediates for the organic industry.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 23-31
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Bragg and Polarimetric Optical Fiber Sensors for Stress Monitoring in Composite Materials
    Autorzy:
    Domanski, A.
    Lesiak, P.
    Milenko, K.
    Budaszewski, D.
    Chychlowski, M.
    Ertman, S.
    Tefelska, M.
    Wolinski, T.
    Jedrzejewski, K.
    Lewandowski, L.
    Jasiewicz, W.
    Helsztynski, J.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795792.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    Composite structures are made of two or more components with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows for introducing optical fiber sensors into the composite material. These sensors can demonstrate stress distribution inside tested material influenced by external tensions. Two types of the optical fiber sensors are used as the 3D structure. One of them is based on application of fiber Bragg grating inside the core of the fiber. Longitudinal stress changes parameters of the Bragg grating and simultaneously, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which, under external stress, introduce polarization changes of the output light.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 294-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of spent iron catalyst for ammonia synthesis
    Autorzy:
    Arabczyk, W.
    Narkiewicz, U.
    Lendzion-Bieluń, Z.
    Moszyński, D.
    Pełech, I.
    Ekiert, E.
    Podsiadły, M.
    Pelka, R.
    Jędrzejewski, R.
    Moszyñska, I.
    Sibera, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/778207.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    katalizator żelazowy
    azotki żelaza
    nanorurka węglowa
    nanowłókna
    iron catalyst
    iron nitrides
    carbon nanotubes
    nanofibers
    Opis:
    Several methods of the utilization of spent iron catalyst for ammonia synthesis have been presented. The formation of iron nitrides of different stoichiometry by direct nitriding in ammonia in the range of temperatures between 350°C and 450°C has been shown. The preparation methods of carbon nanotubes and nanofibers where iron catalyst catalyse the decomposition of hydrocarbons have been described. The formation of magnetite embedded in a carbon material by direct oxidation of carburized iron catalyst has been also presented.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 108-113
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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