Skocz do pozycji: 1.

Tytuł:

Dual-control missile guidance: a simulation study

Autorzy:

Bużantowicz, W.
Pietrasieński, J.

Powiązania:

https://bibliotekanauki.pl/articles/281826.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

dual-control missile
autopilot
guidance
miss distance

Opis:

Theoretical considerations and a simulation study concerning description and analysis of new autopilot structures and issues relating to conversion of guidance commands into deflections of a complex system of control surfaces aimed at minimizing the miss distance value are presented in this paper. Due to nonlinear and nonstationary nature of the phenomena associated with the guidance process, a significant role is assigned to simulation studies. A comparative analysis has been made of the guidance processes of three models of a dual-control missile, which differ in terms of formulae implemented in the control command converters.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 727-739
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 2.

Tytuł:

Simulation study of a missile cold launch system

Autorzy:

Głębocki, R.
Jacewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/280307.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

guided missile
modeling
simulation

Opis:

In this paper the missile flight dynamics during the launch phase is studied. The main concept behind this work was to use a vertical cold launch system and the rapid pitch maneuver to achieve longer missile range and better firing coverage. A set of a small pulse rocket engines was used to obtain the desired missile attitude. The physical and mathematical models of the missile are described. The pulse jets control algorithm is presented. The computer program of the missile model has been developed in the Simulink environment. The missile behavior in the low-speed flight envelope has been examined. The results of numerical simulations in the form of the graphs are presented. It has been obtained that there exist several benefits of the cold launch method as increased range and higher target kill probability.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 901-913
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 3.

Tytuł:

Simulation Study of Inventory Management in Supply Chains

Autorzy:

Wiśniewski, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/503658.pdf

Data publikacji:

2018

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

supply chain
inventory management
computer simulation

Opis:

Well-organized management of a supply chain involves the control of inventory levels and fast response to the changing customer demands. Enterprises cannot cope with this problem which contributes to the growing stock levels and therefore increases costs. The main goal of the article is to present a simulation approach to the problem of inventory management in a supply chain. The work shows the use of computer simulation techniques in order to emulate a supply chain system and its stochastic behaviour. The procedure for the usage of simulation modelling was described in a case study containing an analysis of an online store. The simulation results are presented using statistical parameters, which means that managers can get not only information concerning the expected value of the parameter looking decision-making, but also statistics to the characteristics of the risk associated with the decision associated with possible uncertainty.

Źródło:

Logistics and Transport; 2018, 37, 1; 41-48
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 4.

Tytuł:

Integrated production system on social manufacturing: a simulation study

Autorzy:

Sari, Marti Widya
Herianto
Dharma-IGB, Budi
Tontowi, Alva Edy

Powiązania:

https://bibliotekanauki.pl/articles/27315509.pdf

Data publikacji:

2022

Wydawca:

STE GROUP

Tematy:

social manufacturing
integrated production systems
simulation study
ProModel

Opis:

Today, the manufacturing industry must adapt to dynamic customer needs, changing from time to time following market trends. So that the production process in manufacturing requires adjustments, one of which is by forming social manufacturing. This study aims to create an integrated production system model based on social manufacturing, which involves several Socialized Manufacturing Resources (SMR) as manufacturing resources that are socialized to produce a product. The methods used are field observation, literature study, design of a social manufacturing-based production system model, model simulation using ProModel software, and analysis of model simulation results. In this study, the simulation involves four SMRs, each of which makes a part that has been given specifications by the manufacturer based on customer requests. The product produced is the Sanitation Chamber, which is equipped with a control system to monitor reading data via the internet. The model simulation uses the Pro Model software and analyzes resource use, location utilization, and resource costs.

Źródło:

Management Systems in Production Engineering; 2022, 3 (30); 230--237
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 5.

Tytuł:

Simulation study of hydrodynamic cavitation in the orifice flow

Autorzy:

Pietrykowski, Konrad
Karpiński, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/38436947.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

cavitation
CFD
fluid flow
hydrodynamics
orifice
simulation

Opis:

Hydrodynamic cavitation is a phenomenon that can be used in the water treatment process. For this purpose, venturis or orifices varying in geometry are used. Studying this phenomenon under experimental conditions is challenging due to its high dynamics and difficulties in measuring and observing the phase transition of the liquid. For this reason, the CFD method was used to study the phenomenon of hydrodynamic cavitation occurring in water flow through the orifice and then analyze flow parameters for different boundary conditions. The research was performed for four different orifice geometries and two defined fluid pressure values at the inlet, based on a computational 2D model of the research object created in Ansys Fluent software. As a result of the numerical simulation, the distribution of fluid velocity and pressure and volume fraction of the gas phase were obtained. A qualitative and quantitative analysis of the phenomenon of hydrodynamic cavitation under the considered flow conditions was conducted for the defined orifice geometries. The largest cavitation zone and thus the largest volume fraction of the gas phase was obtained for the orifice diameter of 2 mm with a sharp increase in diameter. However, the geometry with a linear change in diameter provided the largest volume fraction of the gas phase per power unit.

Źródło:

Applied Computer Science; 2022, 18, 3; 31-41
1895-3735
2353-6977

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 6.

Tytuł:

A nanoscale simulation study of elastic properties of gaspeite

Autorzy:

Benazzouz, B.-K.

Powiązania:

https://bibliotekanauki.pl/articles/178463.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

carbonate rock
gaspeite
molecular dynamic
elastic properties
pressure effect
skała węglanowa
gaspeit
dynamika molekularna
właściwości sprężyste
wpływ ciśnienia

Opis:

The study of structural and mechanical properties of carbonate rock is an interesting subject in engineering and its different applications. In this paper, the crystal structure of gaspeite (NiCO3) is investigated by carrying out molecular dynamics simulations based on energy minimization technique using an interatomic interaction potential. At first, we focus on the structural properties of gaspeite mineral. And then, the elastic properties are calculated, including the elastic constants, bulk modulus, shear modulus, the S- and P-wave velocities. In the next part of this paper, the pressure effect will be studied on the structural and elastic properties of NiCO3 at high pressure.

Źródło:

Studia Geotechnica et Mechanica; 2014, 36, 2; 9-16
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 7.

Tytuł:

New Mielno Port design – results by real time simulation study

Autorzy:

Gucma, L.

Powiązania:

https://bibliotekanauki.pl/articles/360503.pdf

Data publikacji:

2014

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

ship manoeuvring simulation
safety of navigation
port design
breakwater optimization

Opis:

Construction of new ports requires applying the entire range of methods and the close cooperation between designers and specialists of different field including safety of navigation or oceanography. At present there is no possible to conduct of such investments without carrying out simulation examinations. These studies most often take place as multistage where the next stage is the result of the previous one. The paper presents complex method of water areas optimization with consideration of navigational safety. In the present study was implemented real-time simulation method. Methods of the simulation of the real time leaning against manoeuvre simulators have been applied. Two distinct from each other alternatives have been explored and the best in terms of safety of navigation has been selected as final. The results were used as a guideline for the development project of a small Polish seaport in Mielno.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 38 (110); 32-38
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 8.

Tytuł:

Assesment of cortical bone thickness using cepstrum analysis. Simulation study

Autorzy:

Falińska, K.
Litniewski, J.
Tasinkiewicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/332677.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Akustyczne

Opis:

Assessment of cortical bone thickness is important from a medical point of view because bone-layer thickness has a diagnostic value. The thinning of the cortical bone layer reduces the mechanical strength of the bone and exposes it to an increased risk of osteoporotic fractures [1]. The hip bone (proximal femur) is the most critical fracture site. The thickness of the cortical layer in the proximal femur is often too thin to be detected from ultrasonic echoes using traditional peak detection methods (for example the envelope method). In such a case the cepstrum analysis technique may be very useful. In this study the cepstrum method was applied to analyze numerically simulated echoes reflected from the layer and to determine layer thickness. In simulation, the transducer operated at 1 MHz and pulses of a 1.5 µs duration were assumed. The thickness of the thinnest layer for which the applied cepstrum analysis gave, the correct result equaled 1 mm, which was ¼ ƛ(ƛ– wavelength of an ultrasonic wave). That value of the d/ƛ ratio is sufficient for future measurements performed in-vivo conditions.

Źródło:

Hydroacoustics; 2014, 17; 47-56
1642-1817

Pojawia się w:

Hydroacoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 9.

Tytuł:

Satisfaction of the condition of order preservation : a simulation study

Autorzy:

Mazurek, Jiří
Kułakowski, Konrad

Powiązania:

https://bibliotekanauki.pl/articles/406465.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pairwise comparisons
eigenvalue method
geometric mean method
condition of order preservation
numerical simulation

Opis:

We examine the satisfaction of the condition of order preservation (COP) concerning different levels of inconsistency for randomly generated multiplicative pairwise comparison matrices (MPCMs) of the order from 3 to 9, where a priority vector is derived both by the eigenvalue (eigenvector) method (EV) and the geometric mean (GM) method. Our results suggest that the GM method and the EV method preserve the COP almost identically, both for the less inconsistent matrices (with Saaty’s consistency index below 0.10), and the more inconsistent matrices (Saaty’s consistency index equal to or greater than 0.10). Further, we find that the frequency of the COP violations grows (almost linearly) with the increasing inconsistency of MPCMs measured by Koczkodaj’s inconsistency index and Saaty’s consistency index, respectively, and we provide graphs to illustrate these relationships.

Źródło:

Operations Research and Decisions; 2020, 30, 2; 77-89
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 10.

Tytuł:

Beneficiation of oxide ores using dense medium cyclones. A simulation study

Autorzy:

Aghlmandi Harzanagh, A.
Ergun, S. L.
Gulcan, E.

Powiązania:

https://bibliotekanauki.pl/articles/110337.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

heavy medium cyclone
heavy liquid
simulation
iron ores
manganese
chromite

Opis:

Recent investigations of particle behavior and segregation phenomena in a cyclone underline that little is known about particle distribution within a heavy medium separation. For this purpose, density profiles in a heavy medium cyclone (HMC) is measured with techniques such as computational fluid dynamics (CFD) in combination with discrete element modelling (DEM), electrical resistance tomography (ERT), X-ray tomography, particle dynamics analyzer (PDA) etc. Along with these modern efforts of determining the performance of HMC, traditional methods depending on empirical inferences based on experimental data are still important and in progress. The aim of this research was to investigate the possibility of using HMC for the concentration of problematic ores which are not coarsely aggregated. Towards this purpose, current empirical methods were applied to experimental data which were derived from float-sink tests of selected heavy minerals and Fe, Mn, and Cr ore samples. Low density difference between particles made the enrichment difficult using other gravity methods like jigs and shaking tables. After determining physical and mineralogical properties of the samples, appropriate size fractions were prepared for float-sink tests. Combination of sodium polytungstate and tungsten carbide powder were used to prepare non-toxic heavy liquids with density up to 3.5 g/cm3. Using the sink-float test results and existing empirical models for high-density DMC plants simulations were performed. The results of the simulations followed by experimental studies showed that HMCs are applicable to process Fe, Mn, and Cr ores with acceptable grade and recovery.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 1; 379-393
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 11.

Tytuł:

Prompt gamma-ray methods for industrial process evaluation : a simulation study

Autorzy:

Mohammed, Mohammed Siddig H.
Alhawsawi, Abdulsalam M.
Aljohani, M. S.
Damoom, Mohammed M.
Banoqitah, Essam M.
Elmoujarkach, Ezzat

Powiązania:

https://bibliotekanauki.pl/articles/2105331.pdf

Data publikacji:

2022

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

prompt gamma ray
sealed sources
radiotracers
industrial process

Opis:

Radioisotope applications in industrial process inspection and evaluation using gamma-ray emitters provide otherwise unavailable information. Offering alternative gamma-ray sources can support the technology by complementing sources’ availability and radiation safety. This work proposes to replace gamma-ray from radioisotopes with prompt gamma-ray from the interaction of neutrons with stable isotopes injected into the industrial process or with the structural material of the industrial process equipment. Monte Carlo N-Particle Transport Code (MCNP5) was used to simulate the irradiation of two-phase fl ow pipes by 252Cf neutron source. Two simulations were run for each pipe, with and without mixing the liquid phase with the stable isotope 157Gd. The detected gamma-ray spectra were analysed, and images of the two phases inside the pipes were produced. The images were compared to images obtained from simulations of gamma transmission measurement using 60Co. Furthermore, results for prompt gamma computed tomography (CT) were presented and discussed. The studies’ outcomes indicate the potential of prompt gamma-ray to carry out the sealed sources applications of gamma transmission measurements and imaging.

Źródło:

Nukleonika; 2022, 67, 1; 11--18
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 12.

Tytuł:

A numerical simulation study of mold filling in the injection molding process

Autorzy:

Baum, Markus
Anders, Denis

Powiązania:

https://bibliotekanauki.pl/articles/29520096.pdf

Data publikacji:

2021

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

injection molding
polymers
Hele-Shaw approximation
computational fluid dynamics
computing methods

Opis:

Injection molding can undoubtedly be regarded as one of the most widely used manufacturing processes for polymers (Guevara-Morales & Figueroa-Lopez, 2014). Furthermore, injection molding has found its way into various branches of industry (Fernandez et al., 2018) since it has several essential advantages over other processing techniques in terms of good surface finish, the ability to process complex parts without the need for secondary operations, and low cost for mass production. In order to find optimal process settings, it is necessary to gain a deeper insight into the filling process and the underlying physical phenomena, as well as a thorough understanding of the complex material behavior. In this context, the numerical simulation of the injection molding process is increasingly important. Therefore, the current contribution is dedicated to present a thorough comparative numerical study for the mold filling of an exemplary thin-walled mold geometry, including a realistic non-Newtonian viscosity model for the polymer melt. For the numerical simulation, the authors employ the commercial CFD software packages Cadmould 3D-F and ANSYS CFX. While ANSYS CFX is a well-established CFD software for numerical modelling of multiphysical phenomena, Cadmould 3D-F is a highly specialized and computationally efficient alternative suitable for certain geometric configurations in the context of injection molding. The present study is new in the sense that it demonstrates the equivalence of the considered software packages for the simulation of the injection molding process in thin-walled mold geometries.

Źródło:

Computer Methods in Materials Science; 2021, 21, 1; 25-34
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 13.

Tytuł:

Statistics of Envelope of High-Frequency Ultrasonic Backscatter from Trabecular Bone: Simulation Study

Autorzy:

Litniewski, J.

Powiązania:

https://bibliotekanauki.pl/articles/177928.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

trabecular bone
Rayleigh distribution
scattering
simulation

Opis:

The paper considers the application of statistical properties of backscattered ultrasonic signal for assessment of the trabecular bone status. Computer simulations were conducted to investigate the properties of the ultrasound pulse-echo signal, as it is received on the transducer surface after scattering in trabecular bone. The micro-architecture of trabecular bone was modeled by a random distribution of long and thin cylindrical scatterers of randomly varying diameters and mechanical properties, oriented perpendicular to the ultrasound beam axis. The received echo signal was calculated as a superposition of echoes from all the scatterers present in the scattering volume. The simulated signal envelope was used for statistical processing to compute various parameters like the mean amplitude, the amplitude MSR defined as the ratio of the mean to the standard deviation and the amplitude histogram. Results indicated that while for the well-defined trabeculae properties within the simulated bone structure the signal envelope values are Rayleigh distributed the significant departures from Rayleigh statistics may be expected as the thickness of trabeculae become random. The influence of the variation of mechanical properties of the bone tissue building the trabeculae on the bone backscattered signal parameters was not observed.

Źródło:

Archives of Acoustics; 2010, 35, 3; 349-360
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 14.

Tytuł:

CFD simulation study of air flow around the airfoil using the Magnus effect

Autorzy:

Sokołowski, P.
Czarnigowski, J.
Magryta, P.

Powiązania:

https://bibliotekanauki.pl/articles/117936.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

Magnus effect
simulation
air flow

Opis:

The article presents a simulation study of air flow around the airfoil equipped with an additional rotary element, using the Magnus effect to change the air flow around it. For this purpose, a two-dimensional computational model for the airfoil without and with the moving element was made. The model was based on the airfoil NACA 8-H-12. The article describes a method of creating a model in two versions: without moving computational grid and with moving computational grid. Studies were carried out for a typical flow rate corresponding to the flow velocity around the gyroplane in a nominal flight speed conditions. Article shows a comparison of flows in both cases, and assesses the impact of the geometry that use the Magnus effect on the work of airfoil.

Źródło:

Applied Computer Science; 2015, 11, 3; 19-33
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 15.

Tytuł:

Simulation study of longitudinal forces in the coupling device of heavy freight trains

Autorzy:

Stokłosa, J.
Jaśkiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/102629.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

heavy freight trains
longitudinal forces
coupling devices
Nadal criterion
modeling
simulation
theory of Kalker’s contact

Opis:

On the LHS line (Broad-gauge Metallurgical Line), far out West of the railway line with a gauge of 1520 mm, heavy goods trains for a gross weight 5500 tons and a length of 850 m are operated. The article presents the results of a simulation study of the forces that occur in the automatic coupling device of SA-3 type of Russian production train consisting of 60 coal wagons of Russian construction of gross mass 91 tons each. The train moves on the 1520 mm gauge tracks curve S type (the radius of curvature of curves 300 m). Simulation studies were conducted using the Train Module of program to dynamic study multielements systems of Universal Mechanism UM 6.0. Keywords: heavy freight trains, the longitudinal forces in the coupling device, Nadal criterion, modeling, simulation, the theory of Kalker’s contact.

Źródło:

Advances in Science and Technology. Research Journal; 2014, 8, 21; 24-30
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 16.

Tytuł:

Numerical simulation study on NO oxidation by OH radical clusters in flue gas

Autorzy:

Wen, Zhengcheng
Zhang, Xiaofeng
Huang, Ju
Yang, Zhengyin

Powiązania:

https://bibliotekanauki.pl/articles/27323979.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Fenton reaction
nitric oxide
numerical simulation
reakcja Fentona
tlenek azotu
symulacja numeryczna

Opis:

Fenton reaction is an important method to remove NO from flue gas. • OH radicals generated in the Fenton reaction can effectively oxidize NO to NO2, which is absorbed and removed by alkali sorbent. To supply guidance for engineering research, numerical simulation of NO oxidation by • OH radical clusters in flue gas has been carried out using Fluent software. The average concentration of NO on the cross sections at various positions of a cylindrical pipe with a circular surface was calculated by simulation. Under various working conditions (temperature, • OH/NO molar ratio, NO concentration in flue gas, and jet velocity), NO oxidation efficiency by • OH radical was simulated and the key factors affecting NO oxidation were analyzed. The results show that temperature and • OH/NO molar ratio are the key factors affecting the oxidation of NO by • OH radicals. The injection velocity has also a significant effect on the oxidation efficiency while the moisture and oxygen content are minor factors influencing the process. The optimum oxidation efficiency of NO is obtained at 473–523 K, the molar ratio of • OH/NO ca. 1.4, the jet velocity 10 m/s, and the flue gas velocity of 3 m/s.

Źródło:

Environment Protection Engineering; 2023, 49, 3; 69--82
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 17.

Tytuł:

Simulation study on the structural optimization of composite insulators based on contaminant deposition

Autorzy:

Lv, Yukun
Chen, Zeze
Wang, Qian
Lu, Yao
Li, Xiaojing

Powiązania:

https://bibliotekanauki.pl/articles/27309958.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

composite insulator
contaminant deposition characteristics
numerical simulation
voltage type
structural optimization

Opis:

Optimizing the aerodynamic structure of composite insulators can guarantee the safe operation of power systems. In this study, we construct a simulation model for composite insulator contaminant deposition using the COMSOL simulation software, and the rationality of the simulation model and method is verified through wind tunnel experiments. Taking the FXBW4-110/100 composite insulator as an example, we adopt a progressive optimization plan to explore the impacts of shed spacing s, and shed inclination angles α and β on its contaminant deposition characteristics under DC and AC voltages. Based on the numerical simulation results, we analyze the antifouling performance of insulators before and after structural optimization. The results indicate the following: 1) The contaminant deposition of the insulator under AC and DC voltages is negatively correlated with the shed spacing s, but positively correlated with the lower inclination angle β. 2) Under AC voltages, the contaminant deposition of the insulator increases with the upper inclination angle α, while under DC voltages, the contaminant deposition shows an uptrend first, then a downtrend and then an uptrend again with the increase of the upper inclination angle α. 3) Compared with the original model, the AC-optimized model ( α = 6°, β = 2° and s = 98 mm) with a larger shed spacing s, and smaller shed inclination angles α and β showed superior antifouling performance at wind speeds of no less than 2 m/s, and under the typical conditions ( v = 2.5 m/s, d = 20 μm, and ρ = 2 200 kg/m 3), its contaminant deposition is 15% less than that of the original model ( α = 10°, β = 2° and s = 80 mm).

Źródło:

Archives of Electrical Engineering; 2023, 72, 4; 1089--1105
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 18.

Tytuł:

Efficiency of selected meta-heuristics applied to the TSP problem: a simulation study

Autorzy:

Kwaśnicka, H.

Powiązania:

https://bibliotekanauki.pl/articles/1931573.pdf

Data publikacji:

2003

Wydawca:

Politechnika Gdańska

Tematy:

ant colony
genetic algorithms
simulated annealing
tabu search
neural networks

Opis:

The paper presents a simulation study of the usefulness of a numberof meta-heuristicsused as optimisation methods forTSPproblems. The five considered approaches are outlined: GeneticAlgorithm, Simulated Annealing, Ant Colony System, Tabu Search and Hopfield Neural Network.Using a purpose-developed computer program, efficiency of the meta-heuriticshas been studied andcompared. Results obtained from about 40000 simulation runs are briefly presented and discussed.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 1; 73-91
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 19.

Tytuł:

Graphene-based Current Mode Logic Circuits : a Simulation Study for an Emerging Technology

Autorzy:

Abdollahi, Hassan
Hooshmand, Reza
Owlia, Hadi

Powiązania:

https://bibliotekanauki.pl/articles/226818.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

current mode logic (CML)
graphene
graphene FET
low-power design

Opis:

In this paper, the usage of graphene transistors is introduced to be a suitable solution for extending low power designs. Static and current mode logic (CML) styles on both nanoscale graphene and silicon FINFET technologies are compared. Results show that power in CML styles approximately are independent of frequency and the graphene-based CML (G-CML) designs are more power-efficient as the frequency and complexity increase. Compared to silicon-based CML (Si-CML) standard cells, there is 94% reduction in power consumption for G-CML counterparts. Furthermore, a G-CML 4-bit adder respectively offers 8.9 and 1.7 times less power and delay than the Si-CML adder.

Źródło:

International Journal of Electronics and Telecommunications; 2019, 65, 3; 381-388
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 20.

Tytuł:

Model predictive control of multilevel cascaded converter with boosting capability – a simulation study

Autorzy:

Wiatr, P.
Kazmierkowski, M. P.

Powiązania:

https://bibliotekanauki.pl/articles/201916.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cascaded H-bridge
CHB
model predictive control
MPC
multilevel converters
sterowanie predykcyjne
konwenter wielopoziomowy

Opis:

This paper presents a multilevel cascaded H-bridge 5-level converter with boosting capability. The standard solution for boosting voltage in power electronic devices is based on a DC-DC converter with a bulky inductor. However, inductor is a problematic component of a power electronic converter because usually it has to be individually designed and produced for every device and also because its size and weight do not allow for compact construction. This paper presents model predictive control (MPC) method that gives boosting capability for the presented converter. A novel contribution of this paper is the development of a predictive model of the converter and cost function enabling output current control and capacitor voltage balancing.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 581-590
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 21.

Tytuł:

Comparative simulation study of production scheduling in the hybrid and the parallel flow

Autorzy:

Varela, M. L. R.
Trojanowska, J.
Carmo-Silva, S.
Costa, N. M. L.
Machado, J.

Powiązania:

https://bibliotekanauki.pl/articles/407017.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

approach for supporting manufacturing scheduling decision making
heuristics
hybrid flow shop
parallel flow shops
makespan

Opis:

Scheduling is one of the most important decisions in production control. An approach is proposed for supporting users to solve scheduling problems, by choosing the combination of physical manufacturing system configuration and the material handling system settings. The approach considers two alternative manufacturing scheduling configurations in a two stage product oriented manufacturing system, exploring the hybrid flow shop (HFS) and the parallel flow shop (PFS) environments. For illustrating the application of the proposed approach an industrial case from the automotive components industry is studied. The main aim of this research to compare results of study of production scheduling in the hybrid and the parallel flow, taking into account the makespan minimization criterion. Thus the HFS and the PFS performance is compared and analyzed, mainly in terms of the makespan, as the transportation times vary. The study shows that the performance HFS is clearly better when the work stations’ processing times are unbalanced, either in nature or as a consequence of the addition of transport times just to one of the work station processing time but loses advantage, becoming worse than the performance of the PFS configuration when the work stations’ processing times are balanced, either in nature or as a consequence of the addition of transport times added on the work stations’ processing times. This means that physical layout configurations along with the way transport time are including the work stations’ processing times should be carefully taken into consideration due to its influence on the performance reached by both HFS and PFS configurations.

Źródło:

Management and Production Engineering Review; 2017, 8, 2; 69-80
2080-8208
2082-1344

Pojawia się w:

Management and Production Engineering Review

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 22.

Tytuł:

Simulation study on the Influence of EEDI requirements to shiphandling in heavy weather

Autorzy:

Nishizaki, C.
Okazaki, T.
Yabuki, H.
Yoshimura, Y.

Powiązania:

https://bibliotekanauki.pl/articles/116458.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

ship handling
Energy Efficiency Design Index (EEDI)
CO2
heavy weather
main engine
Energy Efficiency Operational Index (EEOI)
Maritime Environmental Protection Committee (MEPC)
Pure Car Carrier (PCC)

Opis:

In order to reduce the CO2 emission from ships, International Maritime Organization executes the restriction of Energy Efficiency Design Index (EEDI) which limits amount of CO2 when freight of one ton is carried at one mile. Although the realization of higher efficiency of main engine without reduction of engine output is the best solution, it might be impossible. To comply with the EEDI requirements, it is assumed that the ship’s engine power becomes smaller than the existing ship by means of improving the ship propulsive efficiency. However, shiphandling in rough seas is expected to become difficult when the engine power is reduced. In this paper it is shown that the influence of the degraded main engine exerts on the safety of shiphandling in heavy weather based on the simulation study. In these experiments, both the simulation model that decreased engine power corresponding to EEDI requirement and that with the conventional engine power were tested, and masters in active service maneuvered the test ships in the rough seas.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 855-860
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 23.

Tytuł:

Comparison of the adaptive and neural network control for LWR 4+ manipulators: simulation study

Autorzy:

Woliński, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/140152.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adaptive control
neural network control
redundant manipulator

Opis:

This paper deals with two control algorithms which utilize learning of their models’ parameters. An adaptive and artificial neural network control techniques are described and compared. Both control algorithms are implemented in MATLAB and Simulink environment, and they are used in the simulation of a postion control of the LWR 4+ manipulator subjected to unknown disturbances. The results, showing the better performance of the artificial neural network controller, are shown. Advantages and disadvantages of both controllers are discussed. The usefulness of the learning algorithms for the control of LWR 4+ robots is discussed. Preliminary experiments dealing with dynamic properties of the two LWR 4+ robots are reported.

Źródło:

Archive of Mechanical Engineering; 2020, LXVII, 1; 111-121
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 24.

Tytuł:

On the ordering of n-cyanobiphenyl mesogene molecules on graphene - a computer simulation study

Autorzy:

Gwizdała, Wojciech
Raczyńska, Violetta
Raczyński, Przemysław
Górny, Krzysztof
Dendzik, Zbigniew

Powiązania:

https://bibliotekanauki.pl/articles/1955285.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska

Tematy:

order parameter
liquid crystals
graphene
ultrathin layers

Opis:

We studied ultrathin layers of n-cyanobiphenyl (n=5,6,7,8) mesogene molecules forming thin films on a graphene plane using molecular dynamics simulations in a wide temperature range (220–420K). Each modeled ensemble was heated to the maximum temperature and then cooled (reverse procedure). We calculated the second rank order parameter as a measure of the molecular order of mesogene molecules and we discuss the distribution of angles between them and the global sample director.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 2; 105-111
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 25.

Tytuł:

Properties of water hydrating the galactolipid and phospholipid bilayers: a molecular dynamics simulation study

Autorzy:

Markiewicz, Michał
Baczyński, Krzysztof
Pasenkiewicz-Gierula, Marta

Powiązania:

https://bibliotekanauki.pl/articles/1038986.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

molecular modelling
hydrogen bonds
water diffusion
water dipole orientation
inter-lamellar water

Opis:

Molecular dynamics simulations of 1,2-di-O-acyl-3-O-β-D-galactopyranosyl-sn-glycerol (MGDG) and 1,2-dioleoyl-sn-glycero-3-phosphatidylcholine (DOPC) bilayers were carried out to compare the effect of the lipid head group's chemical structure on the dynamics and orientational order of the water molecules hydrating the bilayer. The effect of the bilayers on the diffusion of water is strong for the neighbouring water molecules i.e., those located not further than 4 Å from any bilayer atom. This is because the neighbouring water molecules are predominantly hydrogen bonded to the lipid oxygen atoms and their mobility is limited to a confined spatial volume. The choline group of DOPC and the galactose group of MGDG affect water diffusion less than the polar groups located deeper in the bilayer interface, and similarly. The latter is an unexpected result since interactions of water with these groups have a vastly different origin. The least affected by the bilayer lipids is the lateral diffusion of unbound water in the bilayer plane (x,y-plane) - it is because the diffusion is not confined by the periodic boundary conditions, whereas that perpendicular to the plane is. Interactions of water molecules with lipid groups also enforce certain orientations of water dipole moments. The profile of an average water orientation along the bilayer normal for the MGDG bilayer differs from that for the DOPC bilayer. In the DOPC bilayer, the ordering effect of the lipid head groups extends further into the water phase than in the MGDG bilayer, whereas inside the bilayer/water interface, ordering of the water dipoles in the MGDG bilayer is higher. It is possible that differences in the profiles of an average water orientation across the bilayer in the DOPC and MGDG bilayers are responsible for differences in the lateral pressure profiles of these bilayers.

Źródło:

Acta Biochimica Polonica; 2015, 62, 3; 475-481
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 26.

Tytuł:

Molecular simulation study on hydration of low-rank coal particles and formation of hydration film

Autorzy:

Xia, Yangchao
Yang, Zili
Xing, Yaowen
Gui, Xiahui

Powiązania:

https://bibliotekanauki.pl/articles/949689.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

low rank coal
water molecule
hydration film
molecular simulation

Opis:

Water molecules in low-rank coal (LRC) significantly influence its upgrading and utilization. To investigate the hydration of LRC particles and the formation of a hydration film, molecular simulation techniques were innovatively used, including molecular dynamics (MD) simulations and density functional theory (DFT) calculations. The adsorption of water molecules on LRC and various oxygen-containing groups was analyzed. The results show that water molecules adsorb close to the LRC surface and form a large overlapping layer at the LRC/water interface. The radial distribution functions (RDFs) show that the adsorption affinity of water molecules on oxygen-containing sites is stronger than that on carbon-containing sites, and the RDF peaks indicate the existence of a hydration film. Moreover, the differences in adsorption between various oxygen-containing groups depend on both the number of hydrogen bonds and the adsorption distances. The calculated binding energies indicate that the adsorption capacity follows the order carboxyl > phenolic hydroxyl > alcoholic hydroxyl > ether linkage > carbonyl. Experimental results show that a high sorption rate exists between water vapor and LRC samples at the beginning of sorption, which verified the simulation results.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 586-596
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 27.

Tytuł:

Pole - Placement Adaptive Control for a Plant with Unknown Structure and Parameters - a Simulation Study

Autorzy:

Horla, D.

Powiązania:

https://bibliotekanauki.pl/articles/384688.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

adaptive control
identification

Opis:

Adaptive pole-placement control for the plant with unknown orders and coefficients of its model is presented in the paper, in an on-line approach. In order to adapt to the plant, the considered controller changes its structure and parameters, along with the identification process. In order to combine structural and parametric identification, the approach presented in [5] has been used, with the simulation runs performed for continuous plant and a discrete-time controller and identification algorithms.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 28-32
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 28.

Tytuł:

Proposal of a Method for Measuring Gas Flow in a Heating Furnace: A Simulation Study

Autorzy:

Pástor, Marcel
Durdán, Milan
Kačur, Ján
Laciak, Marek
Flegner, Patrik

Powiązania:

https://bibliotekanauki.pl/articles/2023997.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

modeling
simulation
flue gas
burners
gas flows
volume zones

Opis:

Metallurgy, as one of the oldest industries, is currently experiencing a technological boom in an effort to increase production efficiency with the least possible impact on the environment. Modeling methods make it possible to design and simulate a technological process or technological equipment for conditions that take into account the above-mentioned aspects. For this reason, the article focuses on the use of simulation modeling using accessible computer technologies in order to improve the operation of heating aggregates with the metal-bearing batch, such as a continuous heating furnace. The paper describes the methodology for modeling the flow of flue gases in the working space of a gas heating furnace, which results in their enthalpy representation. A simulation study was performed for a gas-fired furnace used to heat gates. Three case studies were simulated with set values of on and off burners and fuel flow to them. The effect of these parameters on the total amount of recirculated flue gas was investigated. The results showed that the fuel flow regulation to the burners at the material inlet into the furnace had a higher effect on the overall recirculation than the switching on and off the burners on the furnace's outlet side. The results pointed to critical points on the inner shell of the furnace, which could be the most critically thermally stressed, for example, in the places of the collision of opposing flue gas flows.

Źródło:

Advances in Science and Technology. Research Journal; 2021, 15, 2; 1-12
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 29.

Tytuł:

Transformatorowe systemy bezprzewodowego przesyłu energii BPE - studia symulacyjne
Simulation study of wireless energy transmission systems

Autorzy:

Moradewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/159118.pdf

Data publikacji:

2006

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki

Tematy:

bezprzewodowe przesyłanie energii
przesył energii
przekształtniki rezonansowe

Opis:

W artykule przedstawiono system bezprzewodowego przesyłu energii BPE wykorzystujący sprzężenie elektromagnetyczne, zbudowany na transformatorze z rozdzielonym rdzeniem. Omówiony został model matematyczny transformatora na rdzeniu typu pot, umożliwiający oszacowanie wartości współczynnika sprzężenia uzwojeń transformatora i ich indukcyjności. Przedstawiono model matematyczny łączący stronę wtórną i pierwotną bezprzewodowego systemu przesyłu energii dla wybranych koncepcji kompensacji indukcyjności rozproszenia. Przedstawione zostały wyniki badań symulacyjnych.
This paper describes the theoretical analysis of wireless energy transmission system, build on the two halves pot cores transformer where any halve have own windings. The rotatable pot core transformer can work like slip rings to ensure minimum reluctance for the magnetic flux path and increasing the coupling coefficient between the primary and secondary side, in this case the system can be named as wireless energy transmission system. Compensation the leakage inductance is realized through adding the resonant capacitance to the primary and secondary windings of the transformer. The basic topologies for primary and secondary compensations are presented and compared. To consider the problem of selections resonant circuit and its parameters and achieve the maximum power delivered to the load with minimum VA rating of the power supply, the mathematical model combined the primary and secondary side is developed and the total impedance seen by the power supply is described.

Źródło:

Prace Instytutu Elektrotechniki; 2006, 226; 149-168
0032-6216

Pojawia się w:

Prace Instytutu Elektrotechniki

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 30.

Tytuł:

Simulation study on improving the spatial resolution of photon-counting hybrid pixel X-ray detectors

Autorzy:

Krzyżanowska, Aleksandra
Szczygieł, Robert

Powiązania:

https://bibliotekanauki.pl/articles/2063889.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich

Tematy:

charge sharing
subpixel resolution
pixel detector
hit allocation
single photon counting

Opis:

Hybrid pixel radiation detectors with a direct photon-to-charge conversion working in a single photon counting mode have gained increasing attention due to their high dynamic range and noiseless imaging. Since sensors of different materials can be attached to readout electronics, they enable work with a wide range of photon energies. The charge-sharing effect observed in segmented devices, such as hybrid pixel detectors, is a phenomenon that deteriorates both spatial resolution and detection efficiency. Algorithms that allow the detection of a photon irrespective of the charge-sharing effect are proposed to overcome these limitations. However, the spatial resolution of the detector can be further improved beyond the resolution determined by the pixel size if information about the chargé proportions collected by neighbouring pixels is used to approximate the interaction position. In the article, an approach to achieve a subpixel resolution in a hybrid pixel detector working in the single photon counting mode is described. Requirements and limitations of digital inter-pixel algorithms which can be implemented on-chip are studied. In the simulations, the factors influencing the detector resolution are evaluated, including size of a charge cloud, number of virtual pixel subdivisions, and detector parameters.

Źródło:

Opto-Electronics Review; 2021, 29, 4; 187--191
1230-3402

Pojawia się w:

Opto-Electronics Review

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 31.

Tytuł:

Synthesis and evaluation of the smart electric powered wheelchair route stabilization concept – a simulation study

Autorzy:

Skrzypczyk, K.
Gałuszka, A.
Antas, T.

Powiązania:

https://bibliotekanauki.pl/articles/964024.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

autonomous robots
robot navigation
sensory system
electric power wheelchair
motion control

Opis:

The paper addresses the problem of algorithm synthesis for controlling the motion of an electric powered wheelchair. The aim of the algorithm is to stabilize the wheelchair following a linear path and avoiding obstacles if occurred on its way. The main restriction imposed on the project is the application of simple low-cost sensors. That implies the system to cope with a number of inaccuracies and uncertainties related to the measurements. The goal of this work is to evaluate the possibility of the wheelchair project with a navigation system which aids a disable person to move in a complex and dynamic areas. Exemplary simulations are presented in order to discuss the results obtained.

Źródło:

Archives of Control Sciences; 2015, 25, 2; 263-273
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 32.

Tytuł:

New Control Algorithms for Three-Phase Four-Wire Unified Power Quality Conditioner - a simulation study

Autorzy:

Pal, Y.
Swarup, A.
Singh, B.

Powiązania:

https://bibliotekanauki.pl/articles/262781.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

UPQC
power quality improvement
source neutral current
mitigation
load balancing
voltage harmonics
current harmonics

Opis:

In this paper, some new control algorithms are proposed for a three-phase four-wire Unified Power Quality Conditioner. These control algorithms are based on the combination of Unit Vector Template Generation (UVTG) with Power Balance Theory (PBT), single phase d-q theory, Synchronous Current Detection (CSD) technique, and I CosΦ theory. The performance of each control algorithm of UPQC is evaluated in terms of power factor correction, load balancing and source neutral current mitigation, and voltage and current harmonic mitigation. The performance of proposed control algorithms are compared with synchronous reference frame (SRF) based control algorithm. In each proposed control scheme of the three-phase four-wire UPQC, the current/voltage control is applied over the fundamental supply currents/ load voltages instead of fast changing APFs currents/ voltages, thereby reducing the effects of computational delay. Moreover, the load neutral or shunt APF neutral currents are not sensed hence the required current sensors are reduced. MATLAB/ Simulink based simulations are obtained, which support the functionality of the UPQC.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2013, 16, 1; 1-10
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 33.

Tytuł:

Simulation study to assess the effect of ship beam on the navigable flow conditions in Paris

Autorzy:

Mansuy, M.
Candries, M.
Eloot, K.
Page, S.

Powiązania:

https://bibliotekanauki.pl/articles/24201436.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

inland navigation
ship maneuvering simulator
real time simulation
waterway design
seine river
container transport
bridge
simulation of ship maneuvering

Opis:

Traversing the river Seine in Paris is challenging for inland vessels due to the density and diversity of local traffic that is encountered in a confined environment. The waterway authority, Voies navigables de France (VNF), commissioned a study to assess the relevance of the current regulations when vessels of varying types cross Paris. A first simulation study showed that regulations based on length only may be too restrictive for ships with smaller beams [1]. This paper presents additional simulations executed on a full mission bridge simulator with ships of reduced beam. The main bottlenecks happen at different locations depending on the ship’s beam and ships with smaller beam can sail at higher water levels than the ships considered in the first study. The maximum water levels for which safe passage is possible were determined for each ship. Finally, recommendations have been formulated, which were then discussed with VNF and stakeholders.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 25--31
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 34.

Tytuł:

Material Fatigue Research for Zirconia Ceramic Dental Implant: a Comparative Laboratory and Simulation Study in Dentistry

Autorzy:

Karaçalı, Ö.

Powiązania:

https://bibliotekanauki.pl/articles/1401326.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.40.Np
87.10.Kn
81.05.Mh
81.70.Bt

Opis:

This research focuses on the biocompatible zirconia ceramic (ZrO₂) material and load behavior causing fatigue on the surface of the dental implant in dentistry. Fatigue fracture and wear have been identified as some of the major problems associated with implant loosening, stress-shielding and ultimate implant failure. A static and cyclic fatigue testing of ceramic dental implant in laboratory conditions for this investigation were carried out according to the ISO protocol 14801 under worst-case conditions. A finite element analysis (FEA) of dental implant with accurate geometry and material properties were developed to make realistic investigations on biocompatibility of the implant biomaterial properties and mechanical fatigue behavior of new dental implant comparing Von-Mises criteria and maximum stress levels. The comparison of calculated fatigue life simulation data of and experimental data for the biocompatible zirconia ceramic dental implants is presented. As a conclusion zirconium implant exceeded the established values for maximum incisal bite forces reported in the literature and and also shows better performance than titanium implant material. The results of fatigue of biocompatible zirconia analysis are helpful for implant biomaterial selection and design for clinical interest in dentistry.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1195-1198
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 35.

Tytuł:

Using high level roadway to control gas emission in a longwall mining face – numerical simulation study

Autorzy:

Ma, Yongzhen
Cheng, Jianwei
Zhang, Rui
Wang, Zui
Ran, Dezhi
Sheng, Shuping
Zhang, Jufeng
Si, Junhong
Yu, Zhaoyang

Powiązania:

https://bibliotekanauki.pl/articles/2203351.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

symulacja numeryczna
wentylacja górnicza
kopalnia węgla
high level roadway
gob
numerical simulation
u+hLR ventilation method

Opis:

With the increase of coal mining depth, the gas content in coal seams could also become larger and larger, which could suddenly cause an inrush of gas into the longwall mining face. It is very dangerous for miners’ safety in the underground. The U-shaped ventilation pattern of longwall mining face that underground coal mines currently use is not enough to deliver sufficient air quantities to dilute gases in mining faces, which could result in the gas concentration over the required celling limit by government laws. Thus, the mine must stop production. In this paper, the high level roadway (HLR) is designed and the U + HLR new ventilation pattern is proposed to control gas emission in a longwall mining face. Using computational fluid dynamics simulation (CFD) software, the flow field and gas transportation in the mine gob are studied. The optimized ventilation parameters are summarized. It is found that the best vertical distance of the HLR is 35 m over the coal seam and the horizontal distance is 25 m from the air return roadway. It is recommended that the negative suction pressure design of the high level roadway should be ranged from 9000 Pa to 10000 Pa. Based on the study outcomes, the gas emission could be well controlled in mining faces and avoid any gas disaster accidents.

Źródło:

Archives of Mining Sciences; 2022, 67, 4; 715--728
0860-7001

Pojawia się w:

Archives of Mining Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 36.

Tytuł:

Simulation study of topological point defects in graphitic layer - curvature effect and pair correlation function analysis

Autorzy:

Hawelek, L.

Powiązania:

https://bibliotekanauki.pl/articles/1075560.pdf

Data publikacji:

2016-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.ue
61.72.J-
61.43.Bn
61.66.Fn
61.05.C-

Opis:

The effect of three types of topological defects, single vacancy, double vacancy and the Stone-Thrower-Wales defect on the atomic arrangement in a single graphitic layer is studied using computer simulations. The topological defects were positioned on the perfect hexagonal graphitic layer 20 Å in diameter with different distance from the layer edge and then the geometry of the system was independently optimized using the reactive bond order potential, the semi-empirical quantum-chemical PM7 and the density functional theory method. Curvature and the distortion of the graphitic layer caused by the defects are analyzed and their influence on the pair correlation function is discussed.

Źródło:

Acta Physica Polonica A; 2016, 130, 3; 811-816
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 37.

Tytuł:

The vibration of prototype aircraft propeller speed reduction unit – test bench and FEM numerical simulation study

Autorzy:

Ostapski, W.
Aromiński, A.
Dowkontt, S.

Powiązania:

https://bibliotekanauki.pl/articles/202223.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aircraft propeller
speed reduction unit
natural frequencies
FEM
bench test
jednostka samolotu
redukcja prędkości śmigła
częstotliwości naturalne
MES
metoda elementów skończonych
test drgań skrętnych

Opis:

The results of torsional shaft vibration bench tests for a prototype aircraft propeller speed reduction unit are presented in this paper. The study was conducted as a function of engine speed and lubrication conditions. 3D model of the propeller speed reduction unit was developed. By using the finite element method, normal modes frequencies were defined. The simulation was conducted both unloaded and loaded under nominal power conditions.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 861-873
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 38.

Tytuł:

Simulation study on a warehouse picking process taking into account a predetermined order of further goods loading

Autorzy:

Guerrero-Moreno, Blanca Maria

Powiązania:

https://bibliotekanauki.pl/articles/24200463.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

logistics
order picking
simulation
routing
warehouse management
logistyka
zamówienia
symulacja
zarządzanie magazynem

Opis:

In this article, the results of a series of selected algorithms used during the picking of goods in a warehouse, assuming the order of stacking goods in transport containers is predetermined, are analysed, simulated and evaluated. The importance of the development of this type of algorithms is the possibility of reducing the waiting time of both transport and goods in order to reduce the total cost of the picking process. Afterwards, the results will be analysed by varying the parameters and evaluating the solutions. The aim is to show the results of various picking algorithms when their subsequent stacking order is predetermined, and to use these to identify relationships and define guidelines that could be used to support the design of similar picking algorithms.

Źródło:

Journal of TransLogistics; 2022, 8, 1; 25-39
2450-5870

Pojawia się w:

Journal of TransLogistics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 39.

Tytuł:

ESTIMATION OF POPULATION PARAMETERS USING INFORMATION FROM PREVIOUS PERIOD IN THE CASE OF OVERLAPPING SAMPLES – SIMULATION STUDY

Autorzy:

Kowalczyk, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/453323.pdf

Data publikacji:

2013

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

survey methodology
rotating surveys
repeated surveys overlapping samples

Opis:

The paper concerns the problem of estimating population parameters for repeated rotating surveys. Coefficients required for theoretical BLUE estimator for rotating surveys are for actual real surveys usually not known. There are no theoretical papers relating to this problem. It is therefore necessary to conduct suitable simulation studies. Broad simulation analyses conducted in the paper are carried out on the basis of two populations: generated from a multivariate normal distribution and based on real data derived from agricultural censuses.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 1; 283-292
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 40.

Tytuł:

Protein-protein interaction and coarse grained simulation study of glioblastoma multiforme reveals novel pathways of Gpr17

Autorzy:

Gnanavel, M.
Yli-Harja, O.
Kandhavelu, M.

Powiązania:

https://bibliotekanauki.pl/articles/1935822.pdf

Data publikacji:

2014

Wydawca:

Politechnika Gdańska

Tematy:

signaling network
RNA-Seq
coarse-grain
Glioblastoma Multiforme
pathways

Opis:

Studies of receptor mediated signaling networks in neuronal cells provide a unique opportunity to uncover the basis of many diseases. Receptor signaling cascades proceed from the cell surface, where extra cellular factors interact with their specific receptors e.g. G-Protein Coupled Receptors (GPR). Recent studies have shown that the activation or suppression of GPR 17 in diseased neuronal cells has potential impact in altering the tumor con ditions. We identified many hundred times expressions of GPR 17 in Glioblastoma Multiforme (GBM) from the RNA -Seq data. We also observed many other genes having similar expression patterns with GPR 17, indicating possible connections of this receptor with diverse gene products. We performed a coarse-grained simulation of ∼500 proteins inside a cytoplasm like a box with solvent water molecules. The summarized protein interaction networks resulted from a coarse grained simulation and large scale protein-protein docking reveals novel molecular connections and pathways.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 4; 321--325
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 41.

Tytuł:

Influence of addition of carbon nanotubes on rheological properties of selected liquid lubricants - a computer simulation study

Autorzy:

Chopra, Anjali
Winczewski, Szymon

Powiązania:

https://bibliotekanauki.pl/articles/1954594.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska

Tematy:

nanotechnology
tribology
lubricants
rheology
propylene glycol
carbon nanotubes
non-equilibrium molecular dynamics
nanotechnologia
tribologia
smary
reologia
glikol propylenowy
nanorurki
nierównowagowa dynamika molekularna

Opis:

This work is motivated by the improvement of anti-friction properties of lubricants by addition of CNTs proved experimentally in literature. In particular, a methodology is developed to compute the shear viscosity of liquid lubricants (Propylene Glycol) based on Molecular Dynamics simulation. Non-Equilibrium molecular dynamics (NEMD) approach is used with a reactive force field ReaxFF implemented in LAMMPS. The simulations are performed using the canonical (NVT) ensemble with the so-called SLLOD algorithm. Couette flow is imposed on the system by using Lees-Edwards periodic boundary conditions. Suitable parameters such as simulation time and imposed shear velocity are obtained. Using these parameters, the influence of addition of 27 wt% CNTs to Propylene Glycol on its viscosity is analyzed. Results show that 3.2 million time-steps with a 0.1 fs time-step size is not sufficient for the system to reach equilibrium state for such calculations. With the available computational resources, a shear velocity of 5 × 10−5 Å/fs was observed to give viscosity value with approximately 43% error as compared to the experimental value. Moreover, the lubricant exhibited a shear thinning behaviour with increasing shear rates. CNTs enhanced the lubricant's viscosity by 100-190% depending upon the averaging method used for calculation.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2020, 24, 4; 345-388
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 42.

Tytuł:

A simulation study of Industry 4.0 factories based on the ontology on flexibility with using FlexSim® software

Autorzy:

Luściński, Sławomir
Ivanov, Vitalii

Powiązania:

https://bibliotekanauki.pl/articles/406882.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Industry 4.0
Simulation Modelling
Flexible Manufacturing System
FlexSim

Opis:

The main aim of the article is to develop a simulation model of flexible manufacturing system with applying the ontology on flexibility. Designing manufacturing systems matching both production and market requirements becomes more and more challenging due to the variability of demand for a large number of products made in many variants and short lead times. Manufacturing flexibility is widely recognised as a proven solution to achieve and maintain both the strategical and operational goals of the companies exposed to global competition. Generic simulation model of flexible manufacturing system was developed using FlexSim® 3D software, then the example data were used to demonstrate the developed model applicability. “The Ontology on Flexibility” was applied for evaluation of achieved flexibility of manufacturing system.

Źródło:

Management and Production Engineering Review; 2020, 11, 3; 74-83
2080-8208
2082-1344

Pojawia się w:

Management and Production Engineering Review

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 43.

Tytuł:

Simulation study of the non-collocated control of a cantilever beam
Badania symulacyjne aktywnego sterowania drganiami belki wspornikowej

Autorzy:

Tuma, J.
Mahdal, M.
Suranek, P.

Powiązania:

https://bibliotekanauki.pl/articles/973155.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

cantilever beam
non-collocated control
simulation
active suppression of vibrations
belka wspornikowa
sterowanie
symulacja
aktywna redukcja drgań

Opis:

This article deals with the simulation of the active vibration control of a cantilever beam. For these purposes, a lumped parameter model has been developed and the simplest controller has been designed to ensure the structural stability of the control loop. The controller is of a proportional velocity feedback type. The control loop can also be stable in the case of a very small inherent damping of the cantilever beam. The lumped-parameter model is based on the Euler-Bernoulli beam theory. The developed tools can be used to simulate the collocated and non-collocated active vibration control. Since this article is intended to study the behaviour of a non-collocated control system of the transducer is sensing the vibration of the free end of the beam, while the actuator force acts near the fixed end.
Artykuł dotyczy symulacji aktywnego sterowania drganiami belki wspornikowej. W tym celu zaproponowano model o parametrach skupionych oraz najprostszy regulator, który zapewnia stabilność strukturalną. Zastosowano regulator proporcjonalny, z prędkościowym sprzężeniem zwrotnym. Pętla sterowania może być stabilna nawet w przypadku bardzo małego tłumienia drgań własnych belki. Model o parametrach skupionych został wyprowadzony na podstawie teorii Eulera-Bernoulliego. Zaproponowane podejście może zostać zastosowane do symulacji aktywnego sterowania drganiami w przypadku, gdy czujnik i element wykonawczy są umieszczone w tym samym miejscu bądź w różnych miejscach na belce. Ponieważ artykuł dotyczy badań własności aktywnego sterowania drganiami w drugim z tych przypadków,przetwornik pomiarowy drgań został umieszczony na swobodnym końcu belki, natomiast element wykonawczy działa na utwierdzonym końcu.

Źródło:

Mechanics and Control; 2013, 32, 3; 110-116
2083-6759
2300-7079

Pojawia się w:

Mechanics and Control

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 44.

Tytuł:

Simulation Study on Stiffness of Suspension Seat in the Aspect of the Vibration Assessment Affecting a Vehicle Driver

Autorzy:

Gągorowski, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/503766.pdf

Data publikacji:

2010

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

suspension stiffness
seat
vehicle driver
vibrations

Opis:

This paper presents an original approach to the problem of the optimal stiffness evaluation in a suspension of driver seat for the best reduction of human vibration (whole-body vibration). The basic idea is to take into consideration the individual personal features (biomechanical parameters) of a human being in the process of vibrations assessment. In this article the author presents a complete system to the influence analysis of suspension stiffness on driver vibrations. It consists of the following subsystems: biomechanical model of human representing a specific driver, model of seat with suspension and adjustable spring, model of vehicle, subsystem of road excitation and module for signals processing. The actual research has focused on numerical simulations in the environment Matlab-Simulink-SimMechanics.

Źródło:

Logistics and Transport; 2010, 11, 2; 55-62
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 45.

Tytuł:

Badania symulacyjne w ocenie jakości i trwałości nawierzchni kolejowej i jej stalowych elementów
Simulation study in assessment the quality and durability of the superstructure and its steel components

Autorzy:

Kukulski, J.

Powiązania:

https://bibliotekanauki.pl/articles/383609.pdf

Data publikacji:

2017

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

infrastruktura kolejowa
badania symulacyjne
MES
railway infrastructure
simulation study
FEM

Opis:

W pracy przedstawiono narzędzia symulacyjne, które mogą być wykorzystywane w ocenie jakości i trwałości wybranych elementów nawierzchni kolejowej. W artykule zaprezentowano wybrane wyniki badań symulacyjnych naprężeń własnych w procesie produkcji elementów stalowych rozjazdów kolejowych, jak też uproszczonego modelu nawierzchni kolejowej. Badania obejmowały różne warianty konstrukcji jak i jej obciążenia eksploatacyjne. Prezentowane wyniki badań symulacyjnych stanowiły m.in. uzupełnienie badań doświadczalnych.
The paper presents simulation instruments that can be used to evaluate the quality and durability of selected the superstructure and its components. The article presents selected results of simulation residual stress simulation tests in the steel production process of railway turnouts as well as a simplified model of railway superstructure. The various construction variants and their operating loads have been analysed. Presented results of the simulation studies were among others completion of experimental research.

Źródło:

Archiwum Instytutu Inżynierii Lądowej; 2017, 25; 245-254
1897-4007

Pojawia się w:

Archiwum Instytutu Inżynierii Lądowej

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 46.

Tytuł:

Simulation study on the application of Gibbs sampling for major gene detection in a population of laying hens

Autorzy:

Szydlowski, M
Szwaczkowski, T.

Powiązania:

https://bibliotekanauki.pl/articles/2044229.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

segregation analysis
hen
egg production
laying hen
major gene
detection
genetic variation
Gibbs sampling
animal model

Opis:

A method for the detection of segregating major genes based on the analysis of estimated marginal posterior major gene variance density was examined. The properties of the method were investigated using data sets simulated for a real population of laying hens consisting of eleven generations. Marginal posterior densities of model parameters were estimated by the Gibbs sampling approach proposed by Janss et al. (1995). With the data of about 4000 observations it was possible to detect a major gene responsible for one third of the genetic variance and one tenth of the phenotypic variance, irrespectively of the degree of dominance at the major locus. The inference based on the posterior marginal major gene variance can be sensitive to skewness of the data. It was shown that skewness of 0.2 can lead to a false detection of a major gene. The method is robust against a non-genetic mixture of normal distributions.

Źródło:

Journal of Applied Genetics; 1998, 39, 4; 321-330
1234-1983

Pojawia się w:

Journal of Applied Genetics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 47.

Tytuł:

The errors-in-variable model in the optimal portfolio construction

Autorzy:

Czapkiewicz, A.
Machowska, M.

Powiązania:

https://bibliotekanauki.pl/articles/375915.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

maximum likelihood method
errors-in-variables model
portfolio
simulation study

Opis:

In the paper we consider a modification of Sharpe's method used in classical portfolio analysis for optimal portfolio building. The conventional theory assumes there is a linear relationship between asset's return and market portfolio return, while the influence of all the other factors is not included. We propose not to neglect them any more, but include them into a model. Since the factors in question are often hard to measure or even characterize, we treat them as a disturbances on random variables used by classical Sharpe's method. The key idea of the paper is the modification of the classical approach by application of the errors-in-variable model. We assume that both independent (market portfolio return) as well as dependent (given asset's return) variables are randomly distributed values related with each other by linear relationship and we build the model used for parameters' estimation. To verify the model, we performed an analysis based on archival data from Warsaw Stock Exchange. The results are also included.

Źródło:

Decision Making in Manufacturing and Services; 2007, 1, 1-2; 49-57
1896-8325
2300-7087

Pojawia się w:

Decision Making in Manufacturing and Services

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 48.

Tytuł:

Numerical simulation study on exposed reinforced anti-corrosion layer damage of the cross-sea bridge under the marine environment

Autorzy:

Qu, H.
Su, J.
Huang, P.
Ren, X.

Powiązania:

https://bibliotekanauki.pl/articles/259261.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

cross-sea bridge
reinforced
anti-corrosion damage
numerical simulation

Opis:

To solve the problem of low precision of numerical simulation of the exposed reinforced anti-corrosion layer damage of the cross-sea bridge, we use the stress ratio between the double slash and the reinforced anti-corrosion layer to analyze the parameters and the damage rate in different qualities of reinforced anti-corrosion layers, use Ansys software to build reinforced finite element model, and analyze the damage degree when the inclination angle was 15 °, 45 ° and 60 °, respectively. The experimental results showed that the proposed method can improve the numerical simulation efficiency, the numerical simulation results, the experimental results, and the theoretical analysis results have good consistency and stability.

Źródło:

Polish Maritime Research; 2017, S 3; 207-212
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 49.

Tytuł:

Simulation study on multivariate normality based on Shapiro-Wilk statistic
Badania symulacyjne wielowymiarowej normalności oparte na statystyce Shapiro-Wilka

Autorzy:

Hanusz, Z.
Tarasinska, J.

Powiązania:

https://bibliotekanauki.pl/articles/9787.pdf

Data publikacji:

2010

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki

Źródło:

Colloquium Biometricum; 2010, 40
1896-7701

Pojawia się w:

Colloquium Biometricum

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 50.

Tytuł:

Simulation study on clogging of suspended particles in in-situ leaching of uranium at different concentrations and flow velocity

Autorzy:

Zhou, Chunze
Wang, Hongqiang
Wu, Tongpan
Hu, Eming
Lei, Zhiwu
Wang, Qingliang

Powiązania:

https://bibliotekanauki.pl/articles/24085848.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

in-situ leaching of uraniom
physical clogging
suspended particles
porous medium
permeability coefficient

Opis:

Clogging problem has become one of the key problems restricting the mining efficiency of in-situ leaching of uranium, and the related research on the law and mechanism of physical clogging has not been reported. In order to identify and understand the complicated law and mechanism, experimental device is established to simulate the physical clogging caused by suspended particles in the uranium process, the physical clogging law and mechanism under different concentrations and velocity of flow are studied. The experimental results show that with the concentration of suspended particles increasing from 100, 200, 300 to 400 mg/L, the permeability of porous media gradually decreases, and the clogging phenomenon becomes more and more obvious. When the size of suspended particles is small and the velocity is 15 mL/min, the porous medium will not appear clogging, while the velocity is 25mL/min, the whole porous medium will slowly appear internal deposition clogging. When the size of suspended solids is larger and the flow rate is 9, 12, 15mL/min, the higher the velocity, the faster the clogging will be, and backwash can alleviate the surface clogging but cannot change the final clogging result. According to the experiment and actual situation, the physical clogging in in-situ leaching of uranium is mainly surface clogging and filter clogging.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162150
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce