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Wyszukujesz frazę "(in)stability" wg kryterium: Temat


Tytuł:
Ethnic Politics in Sudan: Dynamics of Instability
Autorzy:
Musa, Abdu Mukhtar
Powiązania:
https://bibliotekanauki.pl/articles/2205026.pdf
Data publikacji:
2022-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
diversity
ethnic identities
tribal conflicts
(in)stability
marginalisation
democracy
Opis:
This paper explains how multiple identities have been formed in this highly diversified country through a historical and descriptive approach. The main objective of this paper is to probe the depth of the root causes of instability and civil wars in Sudan and examine the major factors of conflicts in the country since its independence from Britain in 1956. It also aims at explaining the dynamics that are interacting in Sudan’s political scene and perpetuating instability. The paper is based on the hypothesis that Ethnic identities and tribal politics – practised by the ruling elite – hinder stabilisation and democratisation. It notes that the failure of the political elite to create a ‘melting pot’ for the diverse society resulted in a crisis of identity and conflicts and jeopardised national unity. The outcome of this is the secession of the South (in 2011) and the continuation of tensions in other “marginalised areas such as Darfur, South Kordofan, and the Blue Nile State. The absence of adequate and sound democracy, a lack of rational governance, and equitable socio-economic development aggravated grievances and led to wars in the country’s south, west, and east. The paper believes that it is not only diversity that matters but that many other factors do – notably the failure of the elite to adopt sound policies for properly managing diversity. The paper suggests some sort of consociationalism along with proportional representation to put an end to military interventions and civil wars.
Źródło:
African Journal of Economics, Politics and Social Studies; 2022, 1; 77-88
2956-2686
Pojawia się w:
African Journal of Economics, Politics and Social Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mean-square non-local stability of ship in storm conditions of operation
Autorzy:
Nekrasov, Valeriy
Powiązania:
https://bibliotekanauki.pl/articles/260117.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wind-waves mode
local and nonlocal stability
nonlocal stability in mean
nonlocal stability in mean square
reliability indicator
Opis:
The purpose of the paper is to create a method for studying nonlocal stability in the mean and in the mean square of the ship, positioned on the beam of an intensive wind–waves mode, which is based on the use of the correlation theory of random functions close to continuous Markov processes. With the help of this method and the integral formula of event probability, a method for determining the reliability indicator of the ship in respect of the existing wind–waves excitations of the operating area is formed. An example of investigating the nonlinear motion of the ship, determining its local and nonlocal stability in the first approximation of the theory of considered random functions, is given. Such approximation uses correlation theory with models of acting excitations represented by the generalised derivatives of the Wiener process. Moreover, special attention is paid to reflecting the connection of the proposed methods for investigating the ship stability under constantly acting random excitations with the traditional methods of studying ship stability at small and large inclinations. The established connection defines the proposed methods as a development of the traditional methods of ship stability deterministic theory during the transition to its formation in the class of random functions, with the addition to these methods of the missing link of determining the level of reliability of ships towards the acting wind–waves excitations of the operation area.
Źródło:
Polish Maritime Research; 2019, 4; 6-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Northern Ireland’s Interregnum. Anna Burns’s Depiction of a (Post)-Troubles State of (In)security
Autorzy:
Bartnik, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2032759.pdf
Data publikacji:
2021-11-22
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
divided society
Anna Burns
(post-)Troubles Northern Ireland
society-politics-fiction
a sense of (in)stability/(in)security in contemporary Northern Ireland
Opis:
This paper aims to present the main contours of Burns’s literary output which, interestingly enough, grows into a personal understanding of the collective mindset of (post)-Troubles Northern Ireland. It is legitimate, I argue, to construe her fiction (No Bones, 2001; Little Constructions, 2007; Milkman, 2018) as a body of work shedding light on certain underlying mechanisms of (post-)sectarian violence. Notwithstanding the lapse of time between 1998 and 2020, the Troubles’ toxic legacy has indeed woven an unbroken thread in the social fabric of the region. My reading of the novelist’s selected works intends to show how the local public have been fed by (or have fed themselves upon) an unjustified—maybe even false—sense of security. Burns, in that regard, has positioned herself amongst the aggregate of writers who feel anxious rather than placated, hence their persistence in returning to the roots of Northern Irish societal divisions. Burns’s writing, in the above context, though immersed in the world of the Troubles, paradoxically communicates “an idiosyncratic spatiotemporality” (Maureen Ruprecht Fadem’s phrase), namely an experience beyond the self-imposing, historical time limits. As such, it gains the ability to provide insightful commentaries on conflict-prone relations, the patterns of which can be repeatedly observed in Northern Ireland’s socio-political milieu. Overall, the main idea here is to discuss and present the narrative realm proposed by Burns as (in)determinate, liminal in terms of time and space, positioning readers between “then” and “now” of the region.
Źródło:
Text Matters: A Journal of Literature, Theory and Culture; 2021, 11; 64-83
2083-2931
2084-574X
Pojawia się w:
Text Matters: A Journal of Literature, Theory and Culture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bounded linear stability region in Linear Matrix Inequalities for a multivariable object
Autorzy:
Rybczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/359799.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
LMI
LMI Regions
multivariable system
stability in LMI
LMI in ships
Opis:
This paper is devoted to the concept of stability in linear matrix inequalities. Especially to the analysis of a bounded stability region for a multivariable 3DOF system. The study is focused on two different, user defined, bounded LMI regions where poles are calculated with the use on an algorithm and placed in the left half plane of complex variable plane s. It is shown that in the studied case the shape of the region is irrelevant compared to the location of region bounds. And more specifically only the active bounds where the poles are located on it’s limits are significant to controller operation.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 133-139
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological Properties and Water-in-Oil Structural Stability of Emulsion Matrixes
Autorzy:
Wang, L.
Fang, J.
Powiązania:
https://bibliotekanauki.pl/articles/357954.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
emulsifier
emulsion matrix
rheological properties
viscoelasticity
water-in-oil structural stability
Opis:
The emulsion explosive is one of the important industrial explosives.The structural stability of the water-in-oil (W/O) emulsion matrix of an emulsion ex plosive determines the reliability of its initiation, safety and detonation performance. It is known that the emulsifier is one of the most important factors affecting W/O structural stability. In this paper, several emulsifiers with the functionalities of imide, amide, ester, salt, and sorbin monooleate (SMO) were selected. From the perspective of the rheological properties, the effects of the emulsifier structure and its functionality on the viscosity and visco-elastic properties of the emulsion matrix were analyzed and researched. The results show that emulsifiers with imide/amide functionality and their corresponding emulsion matrixes have higher viscosity at normal temperatures and better fluidity at high temperatures than those of the others. The linear visco-elastic region (LVR) for emulsion matrixes containing these emulsifiers is wider than that of the others. The effect of a change in ambient temperature on the viscosity for a complex emulsifier is small. The emulsion matrix containing the emulsifier named LZ2727B is the most stable, followed by the emulsifier named LZ2727D. This conclusion is consistent with the conclusions from tension tests and from high and low temperature cycling experiments. From the emulsifiers studied in this paper, LZ2727B and LZ2727D emulsifiers are very suitable for manufacturing packaged emulsion explosives. On the other hand emulsifiers based on SMO functionalities, named LZ2731 and LZ2735, are the best choices for manufacturing bulk emulsion explosives.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 1; 87-102
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The shooting approach in analyzing bang-bang extremals with simultaneous control switches
Autorzy:
Felgenhauer, U.
Powiązania:
https://bibliotekanauki.pl/articles/969603.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
bang-bang control
Lipschitz stability in optimal control
nonsmooth optimization
shooting type methods
Opis:
The paper is devoted to stability investigation of optimal structure and switching points position for parametric bang-bang control problem with special focus on simultaneous switches of two control components. In contrast to problems where only simple switches occur, the switching points in general are no longer differentiable functions of input parameters. Conditions for Lipschitz stability are found which generalize known sufficient optimality conditions to nonsmooth situation. The analysis makes use of backward shooting representation of extremals, and of generalized implicit function theorems. The Lipschitz properties are illustrated for an example by constructing backward parameterized family of extremals and providing first-order switching points prediction.
Źródło:
Control and Cybernetics; 2008, 37, 2; 307-327
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilność zatrudnienia w polskiej służbie cywilnej a plany ograniczenia liczebności administracji rządowej
Employment Stability in Polish Civil Service versus Plans of Reducing the Scale of Government Administration
Autorzy:
Szczepański, Marek
Powiązania:
https://bibliotekanauki.pl/articles/904101.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Ekonomiczny w Krakowie, Małopolska Szkoła Administracji Publicznej
Tematy:
służba cywilna
stabilność zatrudnienia w administracji publicznej
civil service
stability of employment in public administration
Opis:
Artykuł omawia problematykę stabilności zatrudnienia w polskiej służbie cywilnej, wobec postulatów zmniejszania kosztów funkcjonowania i liczebności administracji rządowej. W opracowaniu przedstawione zostały wybrane, teoretyczne założenia wyższej niż w przypadku innych grup zawodowych stabilności zatrudnienia w służbie cywilnej. Omówiono ponadto formalne podstawy stabilności zatrudnienia w polskiej służbie cywilnej oraz praktyczne problemy związane z rozwiązywaniem stosunku pracy z jej pracownikami i urzędnikami. Przedstawiono wyniki badań dotyczących wpływu stabilności zatrudnienia na postawy członków korpusu służby cywilnej. Poświęcono też uwagę podjętej w 2010 r. próbie redukcji (racjonalizacji) zatrudnienia w administracji rządowej. W artykule zostały wykorzystane fragmenty rozprawy doktorskiej "Motywacja i motywowanie w polskiej służbie cywilnej" opracowanej pod kierunkiem prof. dr hab. Jolanty Szaban.
The article concerns aspects of employment stability in Polish civil service in the context of the governments plans of reducing the costs of functioning and scale of government administration. The author presents theoretical assumptions of higher employment stability in civil service compared to other professional groups and discusses formal grounds of employment stability in Polish civil service as well as practical problems relating to terminating employment relationships with civil servants. What is more, he introduces the results of research concerning the influence of employment stability on the attitude of civil servants. The article also discusses the 2010 attempt to reduce employment in government administration. To conclude, the author offers some suggestions concerning employment reduction in government administration.
Źródło:
Zarządzanie Publiczne / Public Governance; 2011, 2-3(16-17); 45-54
1898-3529
2658-1116
Pojawia się w:
Zarządzanie Publiczne / Public Governance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktualne zagrożenia stabilności systemu finansowego w Polsce
Autorzy:
Żukowski, Marian
Żukowska, Helena
Powiązania:
https://bibliotekanauki.pl/articles/630070.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
financial and banking system, financial stability, loans in Swiss francs,cooperative credit unions, Council on Systemic Risks
Opis:
The stability of financial system is a major component of the economic securityof a state. An active role of state has a significant impact on ensuring the stabilityof financial system. The most important component of ensuring stability ofa financial system is to maintain stability of the banking sector. Stability of financialsystem is necessary for both the economy as a whole, individual sectors andall stakeholders, including individuals as it is a public good. Although the Polishfinancial system is now stable, three recent incidents need detailed examination:operations and the collapse of investment firm Amber Gold, instability on themortgage loans (denominated in Swiss Franc) market and the restructuring ofthe cooperative credit unions. From the financial point of view, the importance ofthese phenomena is marginal but from the public interest point of view it is vital.Therefore, there is a need to study "hybrid" dangers present in the framework ofthe financial system in Poland and to establish the Council on Systemic Risks aswell as to introduce new regulations to ensure safety of deposits. It is also necessaryto educate public about functioning of the financial market.
Źródło:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2015, 3, 4; 43-60
2082-0976
Pojawia się w:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Jurdjevic-Quinn theorem for stochastic differential systems under weak conditions
Autorzy:
Florchinger, Patrick
Powiązania:
https://bibliotekanauki.pl/articles/2183489.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stochastic differential system
weak solution of stochastic differential equation
asymptotic stability in probability
Barbashin–Krasovskii theorem
stabilizing state feedback law
Opis:
The purpose of this paper is to provide sufficient conditions for the stabilizability of weak solutions of stochastic dif- ferential systems when both the drift and diffusion are affine in the control. This result extends the well–known theorem of Jurdjevic–Quinn (Jurdjevic and Quinn, 1978) to stochastic differential systems under weaker conditions on the system coefficients than those assumed in Florchinger (2002).
Źródło:
Control and Cybernetics; 2022, 51, 1; 21--29
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognozowanie i symulacja kryzysów na przykładzie systemów reagujących na zmiany
Forecasting and simulation of crises on the example system responsive to change
Autorzy:
Szkutnik, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/589080.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Antycypacja marginalna
Kryzys
Miara stabilności
System
Zmiany marginalne
Anticipation marginal system
Changes in marginal measure of stability
Crisis
Opis:
Zjawisko kryzysu analizowane było wielokrotnie w literaturze ekonomicznej na podstawie różnych przesłanek. W niniejszym artykule uwaga do tematyki kryzysów skupiona została na podejściu systemowym. Zanalizowano prognozowanie lub antycypację stabilności kryzysów przy marginalnych zmianach parametrów modelu. Wprowadzono swoistą miarę stabilności systemu ze względu na różnorodność stanów w systemie i zmiany w modelu struktury. Wnioski z przeprowadzonych obliczeń potwierdzają zasadność takiego podejścia. Są one zbieżne z wykazywanymi w teoriach ekonomicznych ogólnymi prawidłowościami względem reakcji systemu na zmiany. Zaobserwowano analogie zachowania się systemów gospodarczych oraz finansowych w warunkach kryzysowych i postkryzysowych.
The phenomenon of the crisis was analyzed repeatedly in the economic literature based on different premises. In the article attention to the subject of crises is focused on systems approach. Forecasting or anticipating stability crises are analyzed with marginal changes in the model parameters. Introduced a specific measure of the stability of the system due to the diversity of states in the system and changes in the model structure. Conclusions from the calculations confirm the validity of this approach. They are consistent with those indicated in the economic theories general laws in reaction to changes in the system. Observed parallels the behavior of the system of economic and financial conditions of crisis and post crisis.
Źródło:
Studia Ekonomiczne; 2016, 289; 191-204
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimality and sensitivity for semilinear bang-bang type optimal control problems
Autorzy:
Felgenhauer, U.
Powiązania:
https://bibliotekanauki.pl/articles/907953.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie optymalne
struktura roztworu
warunki optymalności
bang-bang control
optimality conditions
sensitivity differentials
solution structure
stability in optimal control
strong local optima
Opis:
In optimal control problems with quadratic terminal cost functionals and systems dynamics linear with respect to control, the solution often has a bang-bang character. Our aim is to investigate structural solution stability when the problem data are subject to perturbations. Throughout the paper, we assume that the problem has a (possibly local) optimum such that the control is piecewise constant and almost everywhere takes extremal values. The points of discontinuity are the switching points. In particular, we will exclude the so-called singular control arcs, see Assumptions 1 and 2, Section 2. It is known from the results by Agrachev et al. (2002) stating that regularity assumptions, together with a certain strict second-order condition for the optimization problem formulated in switching points, are sufficient for strong local optimality of a state-control solution pair. This finite-dimensional problem is analyzed in Section 3 and optimality conditions are formulated (Lemma 2). Using well-known results concerning solution sensitivity for mathematical programs in Rn (Fiacco, 1983) one may further conclude that, under parameter changes in the problem data, the switching points will change Lipschitz continuously. The last section completes these qualitative statements by calculating sensitivity differentials (Theorem 2, Lemma 6). The method requires a simultaneous solution of certain linearized multipoint boundary value problems.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 447-454
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funding of Banks in Resolution
Autorzy:
Dżuryk, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/485386.pdf
Data publikacji:
2018-09-13
Wydawca:
Bankowy Fundusz Gwarancyjny
Tematy:
financial stability
financial stability board
resolution
BRRD
funding in resolution
G-SIB
Opis:
The article presents the outcome of the research executed by the author, which formed the position of the European Financial Congress (EFC) in relation to the Financial Stability Board’s consultative document on Funding Strategy Elements of an Implementable Resolution Plan. The position, was based on the opinions of stakeholders of Polish financial market, represented by banks, regulatory bodies, law firms and the academia. The consultative document set out proposed guidance on the development of a plan for funding banks in resolution. The research revealed a wide array of challenges in the development of firm capabilities to facilitate the execution of the funding strategy in resolution. Additional issues were raised regarding relevant aspects for estimating liquidity needs in resolution process. There were indicated numerous obstacles to the mobilisation of assets that could be used as collateral for particularly private sector backstop sources of funding. All those blocking points could be removed by public sector support funding, subject to certain conditions. Moreover, there are a number of actions that could be taken by G-SIBs and authorities to support the development and implementation of resolution funding and there are also some other aspects of funding strategy which shall be also considered.
Źródło:
Bezpieczny Bank; 2018, 2 (71); 126-136
1429-2939
Pojawia się w:
Bezpieczny Bank
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of cefamandole nafate in aqueous solutions
Trwałość mrówczanu cefamandolu w roztworach wodnych
Autorzy:
Medenecka, Beata
Jankowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1038425.pdf
Data publikacji:
2011
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
cefamandole nafate
hplc
stability in aqueous solutions
kinetic and thermodynamic parameters
ph-rate profile
mrówczan cefamandolu
trwałość w roztworach wodnych
parametry kinetyczne i termodynamiczne
Opis:
Cefamandole nafate is a semisynthetic second-generation cephalosporin antibiotic. Its antibacterial activity depends on presence of ß-lactamic bond, which is not stable on hydrolysis reactions. The products of these reactions may be caused diff erent adverse eff ects. The aim of research was to evaluate the stability of cefamandole nafate in TARCEFANDOL in aqueous solutions. The degradation of cefamandole nafate was studied by using high-performance liquid chromatography with ultraviolet (UV) detection, as described in the monograph of cefamandole nafate in the European Pharmacopoeia. The method was modifi ed and revalidated. The stability of cefamandole nafate was investigated in aqueous solutions at 303, 313, 323, 333 K and pH 0.42–9.12. The degradation of cefamandole nafate under the conditions of general and specifi c acid-base catalysis was a fi rst-order reaction depending on the substrate concentration. The catalytic eff ect was caused by the components of phosphate and acetate buff ers. The values of kpH and kB, which describe the general acid-base catalysis (kpH) and the catalytic eff ect of the components of the buff ers (kB), were obtained from the relationship kobs = f([B]T). Whereas in the solutions of hydrochlochloric acid and borate buff er kobs = kpH. The semilogarythmic relationship kpH = f(pH) indicates that in water solutions at pH 0.42–9.12 the following reactions occur: the degradation of cefamandole nafate catalysed by hydrogen and hydroxide ions and spontaneous hydrolysis of cefamandole nafate under the infl uence of water. The catalytic rate constants of partial reactions and the thermodynamic parameters were calculated from suitable equations.
Mrówczan cefamandolu należy do II generacji antybiotyków cefalosporynowych. Ich skuteczne działanie bakteriobójcze jest uwarunkowane obecnością wiązania ß-laktamowego, które jest podatne na czynniki hydrolityczne, a produkty reakcji hydrolizy mogą wywoływać działania niepożądane. Celem badań była ocena trwałości mrówczanu cefamandolu, w preparacie TARCEFANDOL, w roztworach wodnych. W badaniach zastosowano metodę HPLC, polecaną przez Farmakopeę Europejską do oceny jakości mrówczanu cefamandolu. Metodę dostosowano do warunków badania trwałości oraz poddano rewalidacji. Badania trwałości mrówczanu cefamandolu w roztworach wodnych prowadzono w zakresie pH 0,42–9,12 w czterech temperaturach. Rozkład mrówczanu cefamandolu w warunkach ogólnej i właściwej katalizy kwasowo-zasadowej zachodził zgodnie z modelem reakcji pierwszego rzędu względem stężenia substratu. Efekt katalityczny wykazywały składniki buforu fosforanowego i octanowego. Z zależności kobs = f([B]T) wyznaczono wartości kpH i kB, opisujące właściwą katalizę kwasowo-zasadową (kpH) oraz efekt katalityczny składników buforu (kB). W roztworach buforu boranowego i kwasu solnego występowała jedynie właściwa kataliza kwasowo zasadowa, czyli kobs = kpH. Na podstawie zależności log kpH = f(pH) stwierdzono, że na rozkład mrówczanu cefamandolu w roztworach wodnych składają się reakcje: hydrolizy cząsteczek mrówczanu cefamandolu katalizowana jonami wodorowymi i wodorotlenowymi oraz hydrolizy spontanicznej pod wpływem wody. Z odpowiednich równań wyznaczono katalityczne stałe szybkości reakcji cząstkowych oraz parametry termodynamiczne reakcji.
Źródło:
Annales Academiae Medicae Silesiensis; 2011, 65, 5-6; 35-41
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O pułapkach pomiaru osiągnięć szkolnych: „przeciętny uczeń” nie istnieje
Autorzy:
Janusz, Trempała,
Powiązania:
https://bibliotekanauki.pl/articles/892495.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
school achievements
stability and variability
traps in the measurement
Opis:
The thesis of the article is that by focusing attention on the values of the average measurement of school achievement, we ignore variability, thereby reducing significantly the understanding of dynamics in students’ behaviour, development and learning (acquisition of knowledge and skills). The article attempts to show that the approach focused on trends in average is not well fitted to the dynamic nature of phenomena diagnosed in education and can be the source of many artefacts. The pitfalls in which in this approach we most often fall include: (a) a static measurement; (b) averaging the results; (c) the treatment of standard deviation as a measurement error and noise information which is not worth dealing with.
Źródło:
Kwartalnik Pedagogiczny; 2015, 60(4 (238)); 9-23
0023-5938
Pojawia się w:
Kwartalnik Pedagogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emulsja oleju napędowego jako paliwo alternatywne
Emulsified diesel as an alternative fuel
Autorzy:
Pacholski, P.
Błaszczyk, M.
Sęk, J.
Powiązania:
https://bibliotekanauki.pl/articles/134690.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
water-in-Diesel emulsion
alternative fuel
emulsion stability
microexplosion
Opis:
Emulsified water-in-Diesel fuel is a solution that helps to reduce emissions of nitrogen oxides and particulate matters in compression-ignition engines. The biggest advantage of this fuel is a possibility to introduce it to older generation units without any modifications. The presented solution allows the mixture to be burned more complete which results in less soot formation. However, the practical application of this fuel is limited mainly because its limited stability. In this article we review the following issues connected with water-in diesel fuel: its production, stability, influence on engine performance and environmental benefits. The main aspect of this paper is to review the advantages related to better combustion of such emulsion and reduction in emission of health hazardous substances.
Źródło:
Technical Issues; 2016, 4; 62-67
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł

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