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Wyświetlanie 1-15 z 592
Tytuł:
"Did Napoleon Have to Lose the Waterloo Battle?": Some Sensitivity Analysis and Optimization Experiments Using Simulation by Vensim
"Czy Napoleon musiał przegrać Bitwę pod Waterloo?" - analiza wrażliwości i optymalizacja z użyciem vensima
Autorzy:
Kasperska, Elżbieta
Mateja-Losa, Elwira
Bajon, Tomasz
Marjasz, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/585597.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Analiza wrażliwości
Metoda Monte Carlo
Oprogramowanie
Optymalizacja
Symulacja
Monte Carlo method
Optimalization
Sensitivity analysis
Simulation
Software
Opis:
Problem analizy wrażliwości i optymalizacji nieliniowych, dynamicznych i wielopoziomowych systemów jest bardzo interesujący zarówno z punktu widzenia metodologii, jak i zastosowań praktycznych. Celem tego artykułu jest zaprezentowanie nowych wyników autorów w dziedzinie symulacji i optymalizacji z użyciem modelu typu SD (Dynamiki Systemowej). Modelowany system jest interesujący i prezentowany w prostszej wersji jako "Bitwa pod Waterloo" autorstwa profesora Coyla. Wykorzystywane przez autorów oprogramowanie Vensim umożliwia analizę wrażliwości (metodą Monte Carlo) i optymalizację z różnymi typami funkcji celu. Z kolei graficzna wizualizacja wyników zwana "confidence bounds" jest pomocna przy szacowaniu "wrażliwych parametrów" modelu i w ten sposób przy odpowiedzi na pytanie zawarte w tytule artykułu "Czy Napoleon musiał przegrać bitwę pod Waterloo?".
Źródło:
Studia Ekonomiczne; 2014, 188; 97-118
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Hearing Their Voices": Exploring Femicide among Migrants and Culture Minorities
Autorzy:
Nudelman, Anita
Boira, Santiago
Tsomaia, Tina Tiko
Balica, Ecaterina
Tabagua, Sopio
Powiązania:
https://bibliotekanauki.pl/articles/2107586.pdf
Data publikacji:
2017-07-31
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Femicide Survivors
Immigrants
Qualitative Interview Guide
Culture-Sensitivity
Opis:
The rates of domestic violence and femicide in various European countries tend to be higher among migrant women, as well as among women from cultural minorities. This led to the development of a culture and gender-sensitive in-depth interview guide aimed at better understanding this phenomenon, as well as identifying specific aspects of the experience of violence in a foreign scenario. The first stage was developing a draft interview guide based on the most important issues addressed in the professional literature, relating both to victims of domestic violence and to survivors of femicide and their families. This has allowed others to “hear their voices” and to understand their own perspectives, which are especially important considering the steady increase of this phenomenon around the world. The second phase was a pilot study among immigrant femicide survivors: first in Spain, later in Romania, and finally in Georgia, focusing on internally displaced people. The last step was analyzing the feedback from the different countries, which led to a refined and improved version of the interview guide. Thus, the current paper presents an ongoing process leading to a standardized interview guide, which could be adapted to local socio-cultural contexts, enabling comparative studies across Europe.
Źródło:
Qualitative Sociology Review; 2017, 13, 3; 48-68
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Intermedijalna osjetljivost” poezije Antuna Gustava Matoša, perspektiva lirskog subjekta
„Intermedial Sensitivity” of Antun Gustav Matoš’s Poetry, the Perspective of the Lyrical Subject
Autorzy:
Jukić, Sanja
Powiązania:
https://bibliotekanauki.pl/articles/635458.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
intermedial sensitivity
poetic subject
cultural construction of the subject
symbolism
modernism
artism
Opis:
The paper aims to show that the lyrical subject of Matošʼs poetry is indeed a media hybrid structure. This subject usually identifies with the signifiers of other artistic media, such as the theater, dance, music, painting, fashion and architecture. Therefor, Matoš’s lyrical subject reveals itself as a media hybrid being, which is defined by both time and culture.
Źródło:
Poznańskie Studia Slawistyczne; 2014, 7
2084-3011
Pojawia się w:
Poznańskie Studia Slawistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1,1-Diamino-2,2-dinitroethene (DADNE, FOX-7) – Properties and Formulations (a Review)
Autorzy:
Trzciński, W.
Belaada, A.
Powiązania:
https://bibliotekanauki.pl/articles/358760.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
1,1-diamino-2,2-dinitroethene (DADNE, FOX-7)
FOX-7-based formulations
performance
sensitivity
application
Opis:
A review of the available literature on the properties of 1,1-diamino-2,2dinitroethene (DADNE, FOX-7) and formulations containing FOX-7 is presented in this paper. The structural, thermal and spectroscopic properties as well as the sensitivity and explosive properties of FOX-7 are described. Compositions containing FOX-7 are characterized in details and their sensitivity and explosive properties are presented. Potential areas of application for such formulations have been identified.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 2; 527-544
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1D generalized dual-phase lag equation. Sensitivity analysis with respect to the porosity
Autorzy:
Kałuża, G.
Majchrzak, E.
Turchan, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/123000.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
bioheat transfer
generalized dual-phase lag model
sensitivity analysis
finite difference method
przepływ biociepła
metoda różnic skończonych
analiza wrażliwości
Opis:
Thermal processes occurring in the heated tissue are described by the 1D generalized dual-phase lag equation supplemented by appropriate boundary and initial conditions. Using the sensitivity analysis method, the additional problem connected with the porosity is formulated. Both problems are solved by means of the explicit scheme of the finite difference method. In this way it is possible to estimate the temperature changes due to the perturbation of porosity. In the final part of the paper, the example of computation is shown and the conclusions are formulated.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 49-58
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and Its Silver Salt − Synthesis and Characterization
Autorzy:
Musil, T.
Matyáš, R.
Zeman, S.
Růžička, A.
Lyčka, A.
Majzlík, J.
Vala, R.
Knotek, P.
Powiązania:
https://bibliotekanauki.pl/articles/358533.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
azido derivative of triazine
silver salt
sensitivity
MTX-1
X-ray
Opis:
4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and its silver salt (AgTNADAzT) were prepared and characterized. Elemental analysis, FTIR, NMR, DSC, AAS and X-ray diffraction were used for analytical characterization. The sensitivities of TNADAzT and AgTNADAzT were determined and compared with common explosives and MTX-1. The crystal density of TNADAzT is 1.794 g·cm−3 and its heat of formation 899 kJ·mol−1. The sensitivity of TNADAzT to impact and friction slightly exceeds PETN; the sensitivity to electrostatic discharge is lower than RDX. The sensitivity of AgTNADAzT is on the level of a primary explosives (between mercury fulminate and PETN). The initiation efficiency of AgTNADAzT is higher than 200 mg (acceptor PETN compressed by 64-70 MPa) and therefore excludes it from practical use as a primary explosive in detonators.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 304-320
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A characterization of stability and sensitivity properties for state-constrained optimal control
Autorzy:
Malanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/970245.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
optimal control
nonlinear ODEs
state constraints
parametric problems
stability and sensitivity analysis
Opis:
In a series of the recent papers of the author, it was shown that the solutions and Lagrange multipliers of state-constrained optimal control problems are locally Lipschitz continuous and directionally differentiable functions of the parameter, under usual constraint qualifications and weakened second order conditions. In this paper, it is shown that those conditions are not only sufficient, but also necessary. Thus, they consitute a characterization of Lipschitz stability and sensitivity properties for state-constrained optimal control problems.
Źródło:
Control and Cybernetics; 2007, 36, 3; 711-726
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Coherent Model of DCF Valuation
Autorzy:
Patena, Wiktor
Powiązania:
https://bibliotekanauki.pl/articles/475135.pdf
Data publikacji:
2011
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
company valuation
DCF
interactive financial planning system
sensitivity analysis
iteration
Opis:
Business valuation through DCF is recognized as one of the most popular valuation approaches. DCF valuation models, however, have become extremely complex. Modeling requires plenty of input data to be processed, the process is done in many stages, and the data obtained on each of the stages may be interrelated. The process then is not simply a chain of tasks. The modern models work via sophisticated mechanisms of loops being triggered whenever a new piece of information is revealed and the whole model needs updating. Technically speaking, in the spreadsheets environment, this may only be done with the use of iterations. The valuation model should also be subjected to the sensitivity analysis, which is able to quantify the impact of every single assumption made on the final company value. The analysis points out the set of critical assumptions, which have the major impact on the calculated company’s value. Apart from quantifying the impact of the assumptions, the analysis runs qualitative checks on the assumptions assessing the robustness of the arguments standing behind the critical factors for valuation. Consequently, the sensitivity analysis improves the objectivity of the model and mitigates the exposure for the possible results manipulation. The sensitivity analysis reveals its critical role in the valuation process and proves that it should be considered as the standard step in every DCF valuation.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2011, 7; 16-28
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of the sensitivity analysis for systems with viscoelastic elements
Autorzy:
Łasecka-Plura, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/27309874.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
sensitivity analysis
viscoelastic damping elements
dynamic characteristics
fractional
derivatives
analiza wrażliwości
lepkosprężyste elementy tłumiące
charakterystyka dynamiczna
Opis:
This paper discusses the different methods used for calculating first- and second-order sensitivity: the direct differentiation method, the adjoint variables method, and the hybrid method. The solutions obtained allow determining the sensitivity of dynamic characteristics such as eigenvalues and eigenvectors, natural frequencies, and nondimensional damping ratios. The methods were applied for analyzing systems with viscoelastic damping elements, whose behavior can be described by classical and fractional rheological models. However, the derived formulas are general and can also be applied to systems with damping elements described by other models. Their advantage is a compact and easy to code form. The paper also presents a comparison of the computational costs of the discussed methods. The correctness of all the proposed methods has been illustrated with numerical examples.
Źródło:
Archive of Mechanical Engineering; 2023, LXX, 1; 5--25
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comprehensive mathematical programming model for minimizing costs in a multiple-item reverse supply chain with sensitivity analysis
Autorzy:
Mahmoudi, H.
Fazlollahtabar, H.
Powiązania:
https://bibliotekanauki.pl/articles/407169.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reverse supply chain
mathematical modeling
sensitivity analysis
Opis:
These instructions give you guidelines for preparing papers for IFAC conferences. A reverse supply chain is configured by a sequence of elements forming a continuous process to treat return-products until they are properly recovered or disposed. The activities in a reverse supply chain include collection, cleaning, disassembly, test and sorting, storage, transport, and recovery operations. This paper presents a mathematical programming model with the objective of minimizing the total costs of reverse supply chain including transportation, fixed opening, operation, maintenance and remanufacturing costs of centers. The proposed model considers the design of a multi-layer, multi-product reverse supply chain that consists of returning, disassembly, processing, recycling, remanufacturing, materials and distribution centers. This integer linear programming model is solved by using Lingo 9 software and the results are reported. Finally, a sensitivity analysis of the proposed model is also presented.
Źródło:
Management and Production Engineering Review; 2014, 5, 3; 42-52
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comprehensive Study of the Electrostatic Discharge Sensitivity and Chargeability of Tris(carbohydrazide)zinc Perchlorate
Autorzy:
Li, Z.
Zeng, D.
Zhou, Z.
Zhou, M.
Zhang, T.
Huang, H.
Zhang, J.
Yang, L.
Powiązania:
https://bibliotekanauki.pl/articles/358298.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
primary explosive
tris(carbohydrazide)zinc perchlorate
electrostatic discharge sensitivity
chargeability
Opis:
Most primary explosives are non-conductors, easily accumulate charge when contacting with and separating from other materials, and are sensitive to electrostatic discharge (ESD). In order to reduce the number of accidents caused by ESD initiation of primary explosives, studies on their electrostatic hazards are necessary. This work presents comprehensive experimental results of electrostatic discharge sensitivity and chargeability of tris(carbohydrazide)zinc perchlorate (ZnCP) under different conditions. The influences of the testing conditions, of devices, particle size, ambient temperature and relative humidity on the electrostatic discharge sensitivity and chargeability have been investigated in detail, and the quantitative regression equations obtained.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 553-573
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A copula-based method for reliability sensitivity analysis of structural system with correlated failure modes
Oparta na pojęciu kopuły metoda analizy czułości niezawodnościowej systemu konstrukcyjnego o skorelowanych przyczynach uszkodzeń
Autorzy:
Hao, L.
Zhencai, Z.
Powiązania:
https://bibliotekanauki.pl/articles/301567.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability
reliability sensitivity
correlation analysis
copula
niezawodność
czułość niezawodnościowa
analiza korelacji
kopuła
Opis:
Despite many advances in the field of computational reliability analysis, the efficient estimation of the reliability and reliability sensitivity analysis of structural systems with multiple failure modes remains a persistent challenge. The key to deal with the problem lies in the correlation modelling between failure modes. In this paper, the Archimedean copulas are used as an alternative to solve the high-dimensional dependence modeling problem. The probability characteristics of failure modes are described by stochastic perturbation technique, and the reliability index is estimated with the fourth-moment standardization method. Considering that the number of the potential failure modes of the structural systems are relatively large, the probabilistic network evaluation technique is adopted to reduce the computational complexity. The sensitivity analysis is then conducted using the matrix differential technology. The numerical examples show that the applied procedure is able to efficiently consider various failure modes of structural systems in probabilistic assessment and sensitivity analysis.
Mimo poważnych osiągnięć w dziedzinie komputerowej analizy niezawodności, skutecznaocena niezawodności i analiza czułości niezawodnościowej systemów konstrukcyjnych o wielu przyczynach uszkodzeń pozostają ciągłym wyzwaniem. Kluczem do rozwiązania problemu jest modelowanie korelacji między przyczynami uszkodzeń. W niniejszym artykule zastosowano kopuły Archimedesa jako alternatywny sposób rozwiązania problemu modelowania zależności wysoko wymiarowych. Charakterystyki prawdopodobieństwa dla przyczyn uszkodzeń opisano przy pomocy metody zaburzeń stochastycznych, zaś wskaźnik niezawodności oszacowano metodą standaryzacji momentu czwartego rzędu. Biorąc pod uwagę, że liczba potencjalnych przyczyn uszkodzeń systemów konstrukcyjnych jest stosunkowo duża, wykorzystano technikę oceny z zastosowaniem sieci probabilistycznych, która pozwala na zmniejszenie złożoności obliczeniowej. Następnie przeprowadzono analizę czułości przy użyciu metody macierzy równań różniczkowych. Przykłady liczbowe pokazują, że zastosowana procedura pozwala na skuteczną ocenę różnych przyczyn uszkodzeń systemów konstrukcyjnych w ramach oceny probabilistycznej oraz analizy czułości.
Źródło:
Eksploatacja i Niezawodność; 2015, 17, 3; 450-456
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dedicated sensitivity analysis and optimization application for industrial processes
Autorzy:
Myczkowska, Kamila
Szeliga, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/29520087.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sensitivity analysis
modelling of industrial process
optimization
model validation
cooling of rails
Opis:
The paper describes the architecture and the use case of the developed Modelbox system for sensitivity analysis (SA), uncertainty analysis (UA) and the subsequent optimization of industrial processes. The proposed solution addresses the most common practical and technical problems encountered by researchers and engineers when performing sensitivity analysis. It combines the functions from the numerical toolbox with a simulation management system. Maintaining usability and a good user experience while managing complex investigations of time-consuming industrial process simulations is a very important feature of the system. Several improvements were introduced to optimize the computation time of analysis/modelling tasks, including the automatization of distributed calculations, persistent, transparent caching of simulation data and duration estimations from collected statistics. The system has the ability to perform remote, parallel, asynchronous computations of both analytic algorithms and numerical simulations. The system is dynamically scalable horizontally by using serverless computing endpoints and thus it can be easily adapted to the user’s current needs in a flexible way. Modelbox provides web-based access to analysis/modelling tasks from sampling, SA/UA, optimization to metamodelling. It is extended with numerous interactive visualization components for effective results control. In addition, to access data from the completed analysis, the system supports convergence tracking for SA estimates and intermediate optimization results. The process of controlled cooling of rails was considered as a case study. The formulated optimization task was to find a combination of process parameters that ensures a minimum volume fraction of bainite along with required interlamellar spacing and optimal homogeneity of hardness. Different sensitivity analysis methods were used to evaluate the significance of all variables with respect to their influence on the model output.
Źródło:
Computer Methods in Materials Science; 2021, 21, 4; 219-232
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A design of an acoustic coupler for calibration of hydrophones at low frequencies
Autorzy:
Listewnik, Karol
Powiązania:
https://bibliotekanauki.pl/articles/128000.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
acoustic coupler
calibration of hydrophone
low frequencies
receiving sensitivity
konwerter akustyczny
kalibracja hydrofonu
niskie częstotliwości
czułość odbiorcza
Opis:
The purpose of this article is to present a coupler developed for the calibration of hydrophones at low frequencies in the Central Office of Measures (GUM). Due to the growing demand for marine environment research in the field of underwater noise, implemented in accordance with Directive 2008/56/EC, many models of autonomous underwater noise recorders have been developed. Ensuring the reliability of recorded data begins with the reliable calibration of hydrophones and/or the entire recorder. The choice of the calibration method was made on the basis of a detailed and broad analysis of calibration methods and similar solutions of coupling constructs worldwide. The analysis mainly took into account the documents of the last few years. On the basis of this analysis, the vibrating water column method was chosen and the construction of the coupler was developed. Regular calibration of hydrophones will contribute to reliable underwater noise monitoring in the Baltic region.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Melt-Cast Composition Based on NTO and FOX-7
Autorzy:
Belaada, A.
Trzciński, W. A.
Chyłek, Z.
Szala, M.
Paszula, J.
Powiązania:
https://bibliotekanauki.pl/articles/358828.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NTO
FOX-7
low-sensitivity explosives
melt-cast explosives
Opis:
A melt-cast composition containing NTO, FOX-7, TNT, Al and wax was prepared and tested. The viscosity of the melted composition was measured. Its sensitivity to impact, friction, shock wave and jet impact were determined, and its thermal stability and ignition temperature were established. Some detonation properties of the composition were investigated. The heat of detonation was measured using a calorimetric bomb. The detonation pressure and velocity were determined in a plate-dent test. The results of a cylinder test were used for the determination of the Gurney energy, the detonation pressure and energy, and the so-called effective exponent of the expansion isentrope and the JWL equation of state of the detonation products.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 882-902
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 592

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