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Tytuł:
Optymalizacja procesów przemieszczania towarów w firmach kurierskich
Process optimization movement of goods in courier companies
Autorzy:
Zwoliński, B.
Gania, I.
Powiązania:
https://bibliotekanauki.pl/articles/1382875.pdf
Data publikacji:
2017
Wydawca:
Polskie Wydawnictwo Ekonomiczne
Tematy:
logistyka dystrybucji
czas dostawy
koszt dostawy
distribution logistic
time of delivery
cost of delivery
Opis:
W artykule opisano próbę usprawnienia logistyki dystrybucji w przedsiębiorstwie branży kurierskiej, która umożliwiłaby skrócenie czasu oraz zredukowanie kosztów doręczenia przesyłek. Badania prowadzono na przełomie roku 2015/2016. Rozdział pierwszy zawiera wprowadzenie. Rozdział drugi zawiera analizę literatury i opis metod użytych w projekcie. Trzeci rozdział poświęcony jest analizie procesu przemieszczania przesyłek i określeniu jego etapów krytycznych. W tym rozdziale zaprezentowano także opracowaną propozycję rozwiązania usprawniającego, oraz porównanie jego wyników z sytuacją w firmie. Zbadano także ryzyko wystąpienia błędów podczas procesu wdrożenia rozwiązania. Ostatni rozdział zawiera podsumowanie pracy oraz wnioski. Analizowanym przedsiębiorstwem jest firma kurierska, znajdująca się w pierwszej dziesiątce największych firm tej branży w Polsce. Danymi wejściowymi do pracy są listy doręczeń kuriera tego przedsiębiorstwa z przeciągu tygodnia roboczego.
The purpose of this paper is an attempt to elaborate an improvement of the distribution logistics subsystem, which would provide decrease of delivery time and cost reduction. Research conducted at the turn of the year 2015/2016. The first chapter contains introduction. The second chapter contains literature analysis and description of method used during work on project. The third chapter is about analysis of parcels transportation process and selection of it’s critical stages. This part of chapter includes presentation of suggested improvement and comparisson of this solution and situation found in enterprise. It also contains the analysis of the risk of threats to the implementation process. In the last chapter there are summary and conclusions. The analyzed organization is a courier company, which is placed in top ten companies of polish courier services market. The project in this thesis is based on input data, which is courier delivery lists among the working week.
Źródło:
Gospodarka Materiałowa i Logistyka; 2017, 3; 24-31
1231-2037
Pojawia się w:
Gospodarka Materiałowa i Logistyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of residence time distribution and mixing in reactors with recirculation using 2D approach
Autorzy:
Zima, P.
Powiązania:
https://bibliotekanauki.pl/articles/1934023.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska
Tematy:
mathematical modeling
residence time distribution
reactors with recirculation
2D approach
Opis:
In this paper, we propose a 2D approach in order to create a mathematical model for the determination of the residence time distribution for a flow reactor with recirculation. Apart from characterizing the functional residence time distribution, this model can help improve the operation of the reactor at the design stage. The mathematical model was validated by comparison with experiments carried out in a hydraulic laboratory.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 3-4; 297-315
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process Design for Size-Controlled Flame Spray Synthesis of Li4Ti5O12 and Electrochemical Performance
Autorzy:
Waser, O.
Brenner, O.
Groehn, A.J.
Pratsinis, S.E.
Powiązania:
https://bibliotekanauki.pl/articles/952680.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Li-ion battery
Li4Ti5O12
size control
residence time distribution computational fluid
dynamics
flame synthesis of electroceramics
bateria litowo-jonowa
kontrola rozmiaru
płyn obliczeniowy do dystrybucji czasu przebywania
dynamika
synteza płomieniowa elektroceramiki
Opis:
Inexpensive synthesis of electroceramic materials is required for efficient energy storage. Here the design of a scalable process, flame spray pyrolysis (FSP), for synthesis of size-controlled nanomaterials is investigated focusing on understanding the role of air entrainment (AE) during their aerosol synthesis with emphasis on battery materials. The AE into the enclosed FSP reactor is analysed quantitatively by computational fluid dynamics (CFD) and calculated temperatures are verified by Fourier transform infrared spectroscopy (FTIR). Various Li4Ti5O12 (LTO) particle compositions are made and characterized by N2 adsorption, electron microscopy and X-ray diffraction while the electrochemical performance of LTO is tested at various charging rates. Increasing AE decreases recirculation in the enclosing tube leading to lower reactor temperatures and particle concentrations by air dilution as well as shorter and narrower residence time distributions. As a result, particle growth by coagulation - coalescence decreases leading to smaller primary particles that are mostly pure LTO exhibiting high C-rate performance with more than 120 mAh/g galvanostatic specific charge at 40C, outperforming commercial LTO. The effect of AE on FSP-made particle characteristics is demonstrated also in combustion synthesis of LiFePO4 and ZrO2.
Źródło:
Chemical and Process Engineering; 2017, 38, 1; 51-66
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sensitivity analysis of kinetic characterizations in continuous flotation circuits under moderate deviations with respect to perfect mixing
Autorzy:
Vinnett, Luis
Pino-Muñoz, Catalina A.
Yianatos, Juan
Díaz, Francisco
Henríquez, Felipe
Powiązania:
https://bibliotekanauki.pl/articles/2146941.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation kinetics
residence time distribution
perfect mixing
flotation rate distribution
industrial flotation circuit
Opis:
This paper studies the effect of moderate deviations with respect to perfect mixing on the estimated kinetic parameters in industrial flotation banks. Radioactive tracer tests and mass balance surveys were performed to characterize the mixing regimes and Cu kinetic responses. For three models (Single Rate Constant, Rectangular and Gamma), two approaches to incorporate the residence time distributions (RTD) in the kinetic characterizations of rougher banks were compared: (i) RTDs measured from the radioactive tracer tests; and (ii) pure perfect mixing in each flotation machine. The measured RTDs did not present significant bypass in the evaluated banks. In all cases, comparable model fitting was obtained with both RTD approaches, which indicates that the kinetic models add sufficient flexibility to compensate for moderate biases in the mixing regime. The studied kinetic models showed non-significant differences in the estimated maximum recoveries (R∞), mean (kmean) and median (k50) rate constants when comparing the process modelling from measured RTDs and pure perfect mixing. However, the Gamma model was more sensitive to the RTD assumption in terms of the shapes of the flotation rate distributions. From the results, kinetic characterizations focused only on model fitting, or on R∞ and kmean (or k50) estimations have low sensitivity to the assumption of perfect mixing when the RTDs present moderate deviations with respect to this regime. Special attention must be paid when characterizing floating components as the perfect mixing assumption may bias the shapes of the flotation rate distributions.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A discussion on the optimality of bulk entry queue with differentiated hiatuses
Autorzy:
Vadivukarasi, Manickam
Kalidass, Kaliappan
Powiązania:
https://bibliotekanauki.pl/articles/2175843.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
differentiated hiatus time
steady state probability
waiting-time distribution
optimization of expenses
Opis:
We consider Markovian differentiated hiatuses queues with bulk entries. With the help of the matrix geometric method, we discuss the stability condition for the existence of the steady-state solution of our model and we obtain the stationary system size by using a probability generating function. The stochastic decomposition form of stationary system size and the waiting time distribution of an arbitrary beneficiary are also analysed. Furthermore, we perform the expense analysis using the particle swarm optimization technique and we obtain the optimality of service rate and hiatus rate. Finally, we study the effects of changes in the parameters on some important performance measures of the system through numerical observations.
Źródło:
Operations Research and Decisions; 2022, 32, 2; 137--150
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discussion on the transient behavior of single server Markovian multiple variant vacation queues
Autorzy:
Vadivukarasi, Manickam
Kalidass, Kaliappan
Powiązania:
https://bibliotekanauki.pl/articles/2099427.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Markovian queue
multiple variant vacations
transient solution
waiting-time distribution
Opis:
We consider an M/M/1 queue where beneficiary visits occur singly. Once the beneficiary level in the system becomes zero, the server takes a vacation at once. If the server finds no beneficiaries in the system, then the server can take another vacation after the return from the vacation. This process continues until the server has exhaustively taken all the J vacations. The closed form transient solution of the considered model and some important time-dependent performance measures are obtained. Further, the steady state system size distribution is obtained from the time-dependent solution. A stochastic decomposition structure of waiting time distribution and expression for the additional waiting time due to the presence of server vacations are studied. Numerical assessments are presented.
Źródło:
Operations Research and Decisions; 2021, 31, 1; 123--146
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wybranych elementów czasu reakcji systemu ratownictwa medycznego na efektywność udzielania pomocy ofierze wypadku komunikacyjnego
Influence of Selected Elements Affecting Response Time for the Emergency Medical System and the Effectiveness of Administering Aid to Victims of Road Traffic Accidents
Autorzy:
Trzos, A.
Długosz, K.
Powiązania:
https://bibliotekanauki.pl/articles/373668.pdf
Data publikacji:
2015
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
wypadki komunikacyjne
złota godzina
trimodalny rozkład zgonów Trunkey’a
czas reakcji
ratownictwo medyczne
road accidents
golden hour
Turnkey's Trimodal distribution of mortality
reaction time
medical rescue services
Opis:
Cel: Celem pracy jest przedstawienie zależności pomiędzy wybranymi elementami wpływającymi na czas reakcji systemu ratowniczego a możliwością udzielania pomocy poszkodowanym w wypadkach komunikacyjnych. Wprowadzenie: Wypadki komunikacyjne są jedną z najczęstszych przyczyn zgonów w krajach wysokorozwiniętych. Trwająca od lat restrukturyzacja systemu ratownictwa w Polsce ma na celu poprawienie efektywności służb ratowniczych. Ciągłej modyfikacji podlegają elementy, które wpływają na czas reakcji sytemu ratowniczego. Jednak zależność pomiędzy czasem reakcji systemu ratowniczego a efektywnością działań ratowniczych nie jest jedynym czynnikiem, który wpływa na przeżywalność ofiar wypadków. Szereg czynników, determinujących przebieg zdarzenia, wpływa choćby na zakres możliwej do udzielenia pomocy medycznej. Pozycjonowanie sił i środków, transmisja danych on-line, zaangażowanie wolontariuszy, teletransmisja danych o stanie pacjenta w trakcie transportu do szpitala zmieniają możliwości reagowania systemu ratowniczego. Integracja Krajowego Systemu Ratowniczo-Gaśniczego (KSRG) z systemem Państwowe Ratownictwo Medyczne (PRM) w Polsce wpływa na wzrost skuteczności reagowania systemu ratowniczego w pierwszych minutach od zdarzenia, zaś potencjał niezrzeszonych wolontariuszy i organizacji ochotniczych (np. Ochotnicza Straż Pożarna, OSP) jeszcze bardziej zwiększa możliwości systemu ratownictwa medycznego, dzięki skróceniu czasu reakcji i udzieleniu pomocy poszkodowanym w możliwie najkrótszym czasie. Metodologia: Na potrzeby pracy opisano czynniki, biorące udział w określaniu efektywności pracy sił systemu ratownictwa medycznego. Wzięto pod uwagę: czas reakcji systemu ratownictwa medycznego (także pierwszej pomocy i kwalifikowanego ratownictwa), zakres udzielonej pomocy, zdolności diagnostyczne w rozpoznawaniu obrażeń doznanych w wyniku wypadku (szczególnie rozpoznawanie i leczenie zatrzymania krążenia). Sprawdzano wpływ tych czynników na efektywność udzielania pomocy ofiarom wypadków komunikacyjnych. Wnioski: Integracja systemów PRM i KSRG, wsparcie ze strony świadków zdarzenia i ratowników wolontariuszy, a także wykorzystanie nowoczesnych rozwiązań teleinformatycznych wpływa na wzrost efektywności udzielania pomocy ofiarom wypadków komunikacyjnych poprzez skrócenie czasu reakcji systemu ratowniczego.
Aim: The purpose of this study is to reveal the relationship between selected elements, which influence the response time of the rescue system, and the possibility of administering aid to the injured in traffic accidents. Introduction: Traffic accidents are one of the leading causes of death in developed countries. Many years of restructuring the rescue system in Poland was aimed at increasing the effectiveness of emergency rescue services. Elements exposed to constant modification are ones which impact on the response time of the rescue system. However, the relationship between the response time of the rescue system, functioning in Poland in its present form, and the effectiveness of rescue operations is not the only factor, which impacts on the survival of accident victims. There are a number of other factors, which determine the course of events, as well as the extent of possible provision of medical assistance. Positioning of resources - human and equipment, "on-line" data transmission, commitment of volunteer personnel, monitoring and data transmission about the patients’ condition during transportation to hospital are factors, which impact on the response capabilities of the emergency rescue system. Integration of the National Firefighting and Rescue System (NFRS) with Emergency Medical Services (EMS) in Poland, contributes to the effectiveness of the rescue system response during the first few minutes after an incident. Additional possibilities offered by volunteer organisations, such as Fire Service volunteers, will enhance further the capabilities of the medical rescue system, culminating in quicker reaction and provision of aid in possibly the shortest period of time. Methodology: Factors, which influence the effectiveness of the medical emergency system were analysed for the purpose of this research. The study took into account: reaction time of the emergency medical system (first aid and rescue by qualified personnel), scope of administered medical assistance, ability to diagnose injuries sustained in an accident (especially, diagnosis and treatment of a cardiac arrest). Research included a check on the influence of these factors, on the effectiveness of administering aid to victims of traffic accidents. Conclusions: Integration of Emergency Medical Services (EMS) and National Firefighting and Rescue System (NFRS), support from incident witnesses rescue volunteers, and the use of modern ICT solutions, improves effectiveness of aid to victims of road accidents by reducing the rescue system response time.
Źródło:
Bezpieczeństwo i Technika Pożarnicza; 2015, 3; 173-183
1895-8443
Pojawia się w:
Bezpieczeństwo i Technika Pożarnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser-induced ablation: physics and diagnostics of ion emission
Autorzy:
Torrisi, L.
Powiązania:
https://bibliotekanauki.pl/articles/146624.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
laser-generating plasma
Boltzmann distribution
time-of-flight
Opis:
Pulsed lasers generating beams of different intensities may be used to produce ablation of solid targets placed in high vacuum and to generate pulsed plasma and ion acceleration. The plasma is in a non-equilibrium condition and in the first instant the particles being generated are subject to thermal interactions, to a supersonic gas expansion in vacuum and to a Coulomb acceleration due to the high electric field developed along the normal to the target surface. The ion diagnostics, based on time-of-flight technique, allow us to measure the mean ion energy, the total number of ions, as well as the ion energy and charge state distributions. The ion energy distributions may be described by the Coulomb- -Boltzmann-Shifted (CBS) function, which after fitting to the experimental data may be used to determine the equivalent ion temperature and the accelerating voltage. Given the equivalent acceleration voltage and the plasma Debye length, it is possible to estimate the magnitude of the electric field developed in the plasma. Measurements of the ablation yield, plasma dimension and optical spectroscopy allow us to calculate the atomic and electronic plasma density and to evaluate the coronal plasma temperature. Some applications of the laser-induced ablation consist in the realization of laser ion sources (LIS), generation of multi-energetic ion beams by using a post-accelerating voltage, use of ultra-intense fs lasers to accelerate ions to energies of the order of tens MeV/nucleon. Other special applications include the pulsed laser deposition (PLD) of thin films, the laser ablation coupled to mass quadrupole spectrometry (LAMQS) probes, ablation of biological tissues, and generation of plasma for astrophysical and nuclear investigations.
Źródło:
Nukleonika; 2011, 56, 2; 113-117
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czas społeczny w okresie przemian, czyli o nowych zróżnicowaniach społeczeństwa polskiego
Social Time in a Period of Change, or on the New Differentiations in Polish society
Autorzy:
Tarkowska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1373241.pdf
Data publikacji:
2016-12-21
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Polish society
systemic transformation
distribution of time
social differentiation
społeczeństwo polskie
transformacja systemowa
dystrybucja czasu
zróżnicowanie społeczne
Opis:
The author draws attention to the appearance of a new source of differentiations in Polish society at the beginning of the 1990s—the clearly perceptible and subjective sense of an uneven distribution of time. She uses the varying lifestyles and associated temporal orientations observed by Polish sociologists in the 1970s as a reference point: the conservative style, looking to the past; the innovative style, or susceptibility to change; and the ‘today’ style, that is, an orientation toward the present moment, which is systemically conditioned and predominates in various segments of society. The systemic transformation brought major alterations in attitudes to time and change. A deficit of time became more common, and yet as society accelerated sociologists were surprised to observe an increase in groups of people suffering from too much free time. This was a sign of deep social polarization: a division between successful people, who were keeping up with the changes, and were oriented toward the future—planning, and valuing time as a necessity for the realization of those plans—and marginalized people, who were not actively participating in the changes and had too much time on their hands. For both groups, the change in the distribution of time could have negative consequences. For one group, in spite of the satisfaction of achieving goals, there was fatigue, lack of family time, limited participation in cultural activities, and lack of time for reflection. For the other group, there was unused time as a cause of apathy, passivity, and a sense of social marginalization.
Źródło:
Kultura i Społeczeństwo; 2016, 60, 4; 105-119
2300-195X
Pojawia się w:
Kultura i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zdalne porównanie wzorców czasu i częstotliwości COMW z GUM metodą Common View opartą o GPS. Realizacja lokalnej skali czasu UTC w COMW i dystrybucji czasu w sieci lokalnej COMW
Remote comparison of COMW and GUM time and frequency standards based on Common View GPS method. Local UTC time scale at COMW and time distribution in local network
Autorzy:
Targos, R.
Małkiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/153382.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wzorzec czasu i częstotliwości
zdalne porównanie
metoda GPS Common View
skala czasu
dystrybucja czasu
time and frequency standard
remote comparison
Common View GPS method
time scale
time distribution
Opis:
Artykuł przedstawia wykorzystanie metody Common View GPS do zdalnego porównywania wzorców czasu i częstotliwości znajdujacych sie w COMW i GUM. Przedstawione wyniki porównań obejmują okres 6 miesięcy. Zaprezentowano przykłady realizacji synchronizacji własnej sieci lokalnej w oparciu o protokół TCP/IP oraz dystrybucję czasu w obszarze tej sieci.
Application of GPS Common View method in remote comparison of time and frequency standards located in COMW and GUM is presented in the article. Results covers 6-month interval. Examples of local network synchronization based on the TCP/IP protocol and its distribution within this network were presented.
Źródło:
Pomiary Automatyka Kontrola; 2003, R. 49, nr 10, 10; 23-26
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine learning algorithms for the problem of optimizing the distribution of parcels in time-dependent networks: the case study
Autorzy:
Tarapata, Zbigniew
Kulas, Wojciech
Antkiewicz, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2124716.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parcel distribution
optimization
machine learning algorithms
time-dependent networks
dystrybucja przesyłek
optymalizacja
algorytmy uczenia maszynowego
sieci zależne czasowo
Opis:
In the paper we present machine learning algorithms for the problem of optimizing the distribution of parcels in stochastic time-dependent networks, which have been built as a part of some Distribution Optimization System. The problem solved was a modified VRPTW (Vehicle Routing Problem with Time Windows) with many warehouses, a heterogeneous fleet, travel times depending on the time of departure (stochastic time-dependent network) and an extensive cost function as an optimization criterion. To solve the problem a modified simulated annealing (SATM) algorithm has been proposed. The paper presents the results of the algorithm learning process: the calibration of input parameters and the study of the impact of parameters on the quality of the solution (calculation time, transport cost function value) depending on the type of input data. The idea is to divide the input data into classes according to a proposed classification rule and to propose several strategies for selecting the optimal set of calibration parameters. These strategies consist in solving some multi-criteria optimization tasks in which four criterion functions are used: the length of the designated routes, the computation time, the number of epochs used in the algorithm, the number of designated routes. The subproblem was building a network model of travel times that is used in constructed SATM algorithm to determine the travel time between recipients, depending on the time of departure from the start location. An attempt has been made to verify the research hypothesis that the time between two points can be estimated with sufficient accuracy depending on their geographical location and the time of departure (without reference to the micro-scale, i.e. the detailed structure of the road network). The research was conducted on two types of data for Warsaw: from transport companies and one of the Internet traffic data providers. Learning the network model of travel times has produced very promising results, which will be described in the paper.
Źródło:
Archives of Transport; 2022, 61, 1; 133--147
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of trichothecene and zearalenone producing Fusarium species in grain of different cereal species and cultivars grown under organic farming conditions in Lithuania
Autorzy:
Suproniene, S
Justesen, A.F.
Nicolaisen, M.
Mankeviciene, A.
Dabkevicius, Z.
Semaskiene, R.
Leistrumaite, A.
Powiązania:
https://bibliotekanauki.pl/articles/49864.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
Lithuania
organic farming
farming condition
plant cultivar
cereal
real-time polymerase chain reaction
Fusarium
Fusarium langsethiae
trichothecene
zearalenone
distribution
human health
animal health
Źródło:
Annals of Agricultural and Environmental Medicine; 2010, 17, 1; 79-86
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Corrosion Inhibitors by Nuclear Quadrupole Resonance Relaxometry Method
Autorzy:
Sinyavsky, N. Y.
Mershiev, I. G.
Korneva, I. P.
Powiązania:
https://bibliotekanauki.pl/articles/117155.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
corrosion inhibitor
Nuclear Quadrupole Resonance (NQR)
nuclear magnetic resonance (NMR)
Regularized Inverse Laplace Transform (RILT)
Inhibition
corrosion
Relaxation Time Distribution
Nuclear Magnetization Diffusion
Opis:
The changes taking place with the corrosion-resistant coating, but not the state of the surface subjected to corrosion are investigated in this paper in contrast to traditional approaches. We used the method of nitrogen relaxometry NQR and multi-exponential inversion of decay of longitudinal and transverse components of the nuclear magnetization is applied for the first time for this purpose. The results of experimental studies of changes in the distributions of spin-spin and spin-lattice relaxation of crystallite powder of sodium nitrite and urotropin, the mixture of which is used as a corrosion inhibitor of ferrous metals are considered.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 587-590
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of oil’s exploitation time on load carrying capacity in a slider bearing
Autorzy:
Sikora, G.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/244279.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
oil ageing
numerical calculations
Reynolds equation
pressure distribution
load carrying capacities
viscosity changes in time
Opis:
In this paper, authors are presenting conclusions of the numerical calculations of pressure distribution and capacity in a slider bearing with taking changes of oil viscosity in exploitation time into account. Changes of the engine oil’s viscosity, which depend on the exploitation time, were determined on Haake Mars III rheometer and the conclusions were published in Solid State Phenomena and Logistyka in 2015. Numerical calculations were performed by solving of Reynolds equation, using finite difference method and own calculation procedures in Mathcad 15. Reynolds equation was developed by solving the continuity equation and the momentum conservation equation from the fundamentals. For the considerations, the laminar and stationary lubricating of the slider bearing of finite length and full angle of wrap were taken. Assumption of the stationary flow concerns lack of changes in flow parameters in short period of considered phenomena, f. ex. in one hour. Smooth and non-porous bushing were assumed. The aim of this paper was preliminary estimation of influence of viscosity changes in the exploitation time on the load carrying capacities of the cross slider bearing. Wherefore, the viscosity changes dependence on the pressure, temperature and also shear rate, were not taken into account. The basic equations were developed to the non-dimensional form and estimated according to the thin layer theory. In the calculations, the Reynolds boundary conditions concerning pressure distribution were taken into account. Preliminary calculations were performed for different models of viscosity changes in time and circumstances, where the viscosity increases and decreases in exploitation time.
Źródło:
Journal of KONES; 2015, 22, 3; 207-212
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A state-of-the-art review of distribution-of-practice effects on L2 learning
Autorzy:
Serrano, Raquel
Powiązania:
https://bibliotekanauki.pl/articles/2143623.pdf
Data publikacji:
2022-09-27
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
time distribution
intensive instruction
distributed practice
spacing
Opis:
The purpose of this state-of-the-art review is to provide a general overview of recent research on time distribution and second language (L2) learning with special implications for classroom settings. Several studies have been performed to examine how to best distribute the hours of L2 practice to maximize learning by comparing conditions that promote intensive exposure versus others in which L2 input or instruction is more widely spaced. Findings from these studies are relevant not only for practical purposes but also for theory development. This review provides a summary of recent studies as well as suggestions for pedagogical practice. Additionally, it identifies areas for future research concerning the effect of time distribution on L2 learning.
Źródło:
Studies in Second Language Learning and Teaching; 2022, 12, 3; 355-379
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 72

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