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Wyświetlanie 1-15 z 51
Tytuł:
Estimation of Solar Irradiation on Inclined Surface Based on Web Databases
Autorzy:
Mazurek, G.
Powiązania:
https://bibliotekanauki.pl/articles/226138.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solar radiation databases
global tilted irradiation
photovoltaics
array sizing
battery sizing
Opis:
Estimation of Global Tilted Irradiation (GTI) is a key to performance assessment of typical solar systems since they usually employ tilted photovoltaic (PV) modules or collectors. Numerous solar radiation databases can deliver irradiation values both on horizontal and tilted plane, however they are validated mostly with horizontal-plane ground measurements. In this paper we have compared GTI estimates retrieved from five Internet databases with results of measurements at two PV systems located in Poland. Our work shows that in spite of good agreement in annual scale, there is a tendency to underestimate GTI in summer and overestimate in winter, when PV modules can receive less than a half of expected irradiation. The latter issue affects sizing of PV system components and implies a correction needed to achieve all-year long operation.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 4; 315-320
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Glyoxal in Starch Based Sizing Mixture for Surface Modification of Paper
Autorzy:
Akin, Ayse Ebru
Canbolat, Doğan
Ondaral, Sedat
Powiązania:
https://bibliotekanauki.pl/articles/27323537.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
starch
glyoxal
surface sizing
hydrophobicity
Opis:
Starches have been used as the surface sizing or coating material to enhance the strength and surface properties of paper. The main mechanisms behind their performance are physical and chemical interactions between cellulosic fibres and starches. In this study, the usage of glyoxal in an oxidized starch-based sizing mixture was studied to improve the chemical crosslinking due to the additional hydrogen and acetal bonds. The performance of glyoxal on starch sizing formula containing oxidized starch, styrene acrylate and polyaluminium chloride were studied in terms of water resistance and mechanical properties of paper. The results showed that the water absorption values (Cobb60) decreased by 32% when adding glyoxal to paper coated with the reference solution, which contained only a styrene acrylate copolymer. Additionally, with this newly formulated surface sizing application, the tensile strength of the papers increased by about 16% compared with the reference.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 211; Art. no. 1644-3985.444.09
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielkości bufora w metodzie łańcucha krytycznego w przypadkach dwumianowych rozkładów prawdopodobieństwa czasu realizacji zadań
Buffer Sizing in Critical Chain Method in Case of Binomial Probability Distribution of Task Duration
Autorzy:
Bieniecki, Marian
Powiązania:
https://bibliotekanauki.pl/articles/904723.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
project management
critical chain
buffer sizing
Opis:
An attempt of critical chain method for project consisted of special tasks has been applied. The probability distribution of such a task duration is discrete, particularly binomial. The sizing of appropriate path buffer has been suggested. The possibility of early buffer exceeding warning has been noticed.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 287
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Expected Wind Speed Fluctuation on the Number of Batteries of the Balancing System
Autorzy:
Yaremenko, Mykhailo
Klen, Kateryna
Powiązania:
https://bibliotekanauki.pl/articles/2175931.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
battery
Peukert's law
optimal sizing
forecasting
Opis:
The article discusses a method of assessing the of dependence of the number of batteries that would be needed to achieve energy balance in distributed generation systems with wind turbines on ambient temperature and on the error involved in predicting the parameters of wind flow (wind speed). To describe the relationship between current rate and capacity in a given current range, Peukert’s law is used. Dependence of the Peukert's constant on ambient temperature for the lead-acid battery HZB12-180FA is calculated. Taking the lead-acid battery and wind turbine VE-2 as a reference, dependence of area of controlled operation of the battery on the wind speed forecasting error is calculated. The technique of considering ambient temperature, depth of discharge, and wind speed forecasting error when deciding the size of energy storage of the balancing system (the number of batteries and their capacity) is provided. A family of curves representing the dependence of the number of batteries constituting the balancing system on the ambient temperature and the wind speed forecasting error are presented. It is shown that as the wind speed forecasting error increases from 0% to 15% and the ambient temperature decreases from 20 °C to 20 °C, the number of batteries should be increased by approximately 2.81 times in order to maintain the same area of controlled operation of a battery.
Źródło:
Power Electronics and Drives; 2022, 7, 42; 187--196
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explicit modeling of multi-period setup times in proportional lot-sizing and scheduling problem with variable capacity
Autorzy:
Kaczmarczyk, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/2083469.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production
lot-sizing
scheduling
mixed-integer programming
Opis:
Small bucket models with many short fictitious micro-periods ensure high-quality schedules in multi-level systems, i.e., with multiple stages or dependent demand. In such models, setup times longer than a single period are, however, more likely. This paper presents new mixed-integer programming models for the proportional lot-sizing and scheduling problem (PLSP) with setup operations overlapping multiple periods with variable capacity. A new model is proposed that explicitly determines periods overlapped by each setup operation and the time spent on setup execution during each period. The model assumes that most periods have the same length; however, a few of them are shorter, and the time interval determined by two consecutive shorter periods is always longer than a single setup operation. The computational experiments show that the new model requires a significantly smaller computation effort than known models.
Źródło:
Archives of Control Sciences; 2021, 31, 4; 883-912
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical analysis of fixed screen in coal extraction activities (case study: PT. MAL)
Autorzy:
Seprizal, Muhammad Faisal
Hasjim, Machmud
Juniah, Restu
Powiązania:
https://bibliotekanauki.pl/articles/27324348.pdf
Data publikacji:
2022
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
extraction of coal
fixed screen
modification
sizing
Opis:
The extraction of coal is one of the activities involved in mining operations, where drilling, blasting, milling, crushing, sizing, and screening of minerals are performed. At PT. MAL, Indonesia, this extraction activity involves in-pit processing, such as the sizing of coal using a fixed screen. This study aims to analyze the technical sectors regarding the use of fixed screens in coal production activities. This is carried out to reduce the production time and costs, as productivity is expected to increase and completely meet market demands. The challenges involved in the use of fixed screens influenced the availability value of coal. In this case, the use of availability (UA) and effective utilization (EU) values of the utilized excavator were insufficient. These conditions were due to the observation of many challenges in the coal extraction activities. The challenges also affected the performance and production of the excavator, where the solution emphasized the redesign of the fixed screen through the modification of several parameters, such as the angle of repose and screen capacity.
Źródło:
Mining Machines; 2022, 40, 4; 191--205
2719-3306
Pojawia się w:
Mining Machines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cooperative Games in Integration of Supply Chain on the Example of Purchasing Groups
Autorzy:
Rzeczycki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/503846.pdf
Data publikacji:
2014
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
lot sizing
purchasing groups
game theory
ABC method
Opis:
Purchasing group can improve the chance of a higher return for individual entities in the supply chain. The greater sales occurs between companies, the higher the probability of deepening integration between them. Functioning of the purchasing group is, however, dependent on the justice of imputation the profits generated by it (discounts, cost reduction) for its entities. Article presents the use of cooperative game, in order to explain the possibility of optimizing and sharing the profits (payoffs), and in a longer perspective, build an integrated supply chain.
Źródło:
Logistics and Transport; 2014, 24, 4; 15-20
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended model formulation of the Proportional Lot-sizing and Scheduling Problem with lost demand costs
Autorzy:
Kaczmarczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/375882.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
production
lot-sizing
scheduling
mixed integer linear programming
Opis:
We consider mixed-integer linear programming (MIP) models of production planning problems known as the small bucket lot-sizing and scheduling problems. We present an application of a class of valid inequalities to the case with lost demand (stock-out) costs. Presented results of numerical experiments made for the the Proportional Lot-sizing and Scheduling Problem (PLSP) confirm benefits of such extended model formulation.
Źródło:
Decision Making in Manufacturing and Services; 2011, 5, 1-2; 49-56
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling multi-period set-up times in the Proportional Lot-Sizing Problem
Autorzy:
Kaczmarczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/375894.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
production
lot-sizing and scheduling
mixed-integer programming
Opis:
This paper presents new mixed integer programming models for the Proportional Lot-Sizing Problem (PLSP) with set-up times longer than a period. Proposed models explicitly calculate the distribution of times amongst products in periods with a changeover and determine a final period for every set-up operation. Presented results prove that the proposed models are easier to solve using standard MIP methods than already known models.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 15-35
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical tips for modelling Lot-Sizing and Scheduling Problems
Autorzy:
Kaczmarczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/375896.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
production
lot-sizing and scheduling
mixed-integer programming
Opis:
This paper presents some important alternatives for modelling Lot-Sizing and Scheduling Problems. First, the accuracy of models can improved by using short time buckets, which allow more detailed planning but lead to higher computational effort. Next, valid inequalities make the models tighter but increase their size. Sometimes it is possible to find a good balance between the size and tightness of a model by limiting a priori the number of valid inequalities. Finally, a special normalization of the variables simplifies the presentation of results and validation of models.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 37-48
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural characterization of polymer concrete comprising waste marble and date palm fibers
Autorzy:
Rokbi, Mansour
Rahmouni, Zine El Abidine
Baali, Brahim
Powiązania:
https://bibliotekanauki.pl/articles/298435.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
polymer concrete
date palm fibers
quartz
marble
fibers sizing
Opis:
Three-point bending. Abstract This work is an experimental approach for the development and characterization of a polymer concrete reinforced with natural fibers. The polymer concrete consists of sand (Quartz) and orthophthalic polyester used as a binder. Marble powder was used to ensure the continuity of the particle size of the granular mixture. As reinforcement, 2% of chopped date palm fibers (short, very short or mixed) were added. For comparison, identical polymer concrete flexure specimens reinforced with the same content of short E-glass fibers were also prepared and tested. All specimens were initially cured at room temperature and then post-cured for 6 h at 70°C. The results of three-point bending on smooth specimens with different rates of charges (marble), showed that the flexural and compressive strength were improved by adding 20% of marble, and were 31.80 MPa and 67.42 MPa respectively. The flexural strength of specimens showed that the improvement or the degradation of polymer concrete properties seemed to be attributed to the nature of fibers (treated or untreated), and/or to the fibers sizing (short, very short or mixed).
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(2); 169-182
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shadow Sizing as a hot trub particles identification method
Zastosowanie Shadow Sizing do identyfikacji cząstek osadu gorącego
Autorzy:
Jakubowski, M.
Sterczyńska, M.
Antonowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/154702.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
shadow sizing
whirlpool
hot trub
kadź wirowa
osad gorący
Opis:
This article presents the application of the Shadow Sizing method for the analysis of fundamental morphometric parameters of the hot trub particles resulting from the beer wort manufacturing process. Research material was provided by a whirlpool separator, working in an industrial environment. The analyses were performed using a test rig assembled in the Department of Food Industry Devices and Processes at Koszalin University of Technology. The measurements were performed with the use of computer-aided image analysis, which incorporated a Shadow processor implemented in the DynamicStudio platform.
Artykuł prezentuje możliwość zastosowania metody Shadow Sizing do analizy wielkości oraz prędkości cząstek osadu gorącego oddzielonych od brzeczki piwnej. Wytrącanie osadu gorącego następuje podczas procesu gotowania brzeczki piwnej. Do jego usuwania wykorzystuje się separator z zawirowaniem zwanym whirlpoolem. Znajomość rozkładu wielkości cząstek osadu gorącego pozwala na wprowadzenie wybranych danych morfometrycznych do opracowywanego modelu CFD (Computational Fluid Dynamics) przepływu w kadzi wirowej. Materiał do badań stanowiła brzeczka produkowana na warzelni browaru przemysłowego średniej wielkości. Pomiary prowadzono na próbkach brzeczki z osadem gorącym pobranych po klarowaniu w whirlpoolu. Analizę Shadow Sizing wykonano na stanowisku badawczym zbudowanym w Katedrze Procesów i Urządzeń Przemysłu Spożywczego Politechniki Koszalińskiej. Stanowisko składało się z kamery FlowSence 2M wyposażonej w obiektyw z zestawem pierścieni pośrednich, stolika z uchwytem z kuwetą pomiarową o grubości 2,5 mm i źródła światła oświetlającego próbkę z kuwetą umiejscowioną naprzeciw obiektywu kamery. Do obróbki obrazów wykorzystano oprogramowanie Dantec DynamicStudio w wersji v3.41. Przedstawiono przykładową obróbkę wstępną obrazu, konieczną do przeprowadzenia analizy obrazu osadu o wysokim stopniu koncentracji cząstek. Zaprezentowano również przykładowe wyniki pomiaru rozmiarów i przemieszczenia zidentyfikowanych cząstek oraz przygotowanie materiału do tego typu analiz.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 10, 10; 893-896
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Set-up Times Overlapping Two Periods in the Proportional Lot-Sizing Problem with Identical Parallel Machines
Autorzy:
Kaczmarczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/375946.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
production planning
lot-sizing and scheduling
mixed-integer programming
Opis:
This paper presents a new mixed integer programming model for the Proportional Lot-Sizing Problem (PLSP) with identical parallel machines and set-up times overlapping two periods. The proposed model assumes constant period length and explicitly calculates the distribution of set-up operations among periods. The presented results of computational experiments with standard mip methods prove that the untying set-ups from period borders enables the reduction of the total costs in optimal solutions.
Źródło:
Decision Making in Manufacturing and Services; 2013, 7, 1-2; 43-50
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural weight minimization of high speed vehicle-passenger catamaran by genetic algorithm
Autorzy:
Sekulski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/258678.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship structure
optimization
topology optimization
sizing optimization
genetic algorithm
Opis:
Reduction of hull structural weight is the most important aim in the design of many ship types. But the ability of designers to produce optimal designs of ship structures is severely limited by the calculation techniques available for this task. Complete definition of the optimal structural design requires formulation of size-topology-shape-material optimization task unifying optimization problems from four areas and effective solution of the problem. So far a significant progress towards solution of this problem has not been achieved. In other hand in recent years attempts have been made to apply genetic algorithm (GA) optimization techniques to design of ship structures. An objective of the paper was to create a computer code and investigate a possibility of simultaneous optimization of both topology and scantlings of structural elements of large spacial sections of ships using GA. In the paper GA is applied to solve the problem of structural weight minimisation of a high speed vehicle-passenger catamaran with several design variables as dimensions of the plate thickness, longitudinal stiffeners and transverse frames and spacing between longitudinals and transversal members. Results of numerical experiments obtained using the code are presented. They shows that GA can be an efficient optimization tool for simultaneous design of topology and sizing high speed craft structures.
Źródło:
Polish Maritime Research; 2009, 2; 11-23
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal energy source for an environmentally-friendly go-kart
Autorzy:
Filipek, P. Z.
Ostrowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/123554.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
electrical vehicle
go-kart
optimal battery sizing
traction simulation
Opis:
A method for a sizing of an electromechanical battery for electrical go-kart was presented in the paper. The main goal of this research was to replace the internal combustion (IC) engine by an electric drive system taking into account the traction properties, on the one hand and the duration of operation on a single charge and the number of the battery life cycles on the other. The proposed method permits an entire depreciation of the price of the vehicle before the degradation of the battery occurs. The results of the study have been used to adjust the source for electric go-karts that will be mass produced.
Źródło:
Journal of Ecological Engineering; 2016, 17, 5; 90-95
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

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