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    Wyświetlanie 1-8 z 8
    Tytuł:
    Temporal analysis of urban changes and development in Warsaws ventilation corridors
    Autorzy:
    Wicht, Marzena
    Osińska-Skotak, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2040367.pdf
    Data publikacji:
    2017-02-10
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Spatial analysis
    GIS
    FAR
    floor area ratio
    urban climate
    ventilation corridors
    Opis:
    This paper presents the results of the urban indicators analysis conducted within Warsaw's ventilation corridors from 1992 to 2011. The literature review shows that the Floor Area Ratio (FaR) index is one of the best indicators to detect urban development; therefore, this was the core of the analysis. Three periods were analysed (1992 - 2002 - 2011), as such a long time-span allows the assumption that change will be visible. The ventilation corridors were divided into 500 m and 100 m grids and the FaR index was calculated for each cell. The results highlight alarming changes within some of the corridors, indicating areas that are crucial to sufficient air flow in Warsaw.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2016, 20, 4; 11-21
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth analysis using curve fitting method in early and late sown sunflower.
    Autorzy:
    Parmar, N.G.
    Chanda, S.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198853.pdf
    Data publikacji:
    2002-06-23
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    growth analysis
    sunflower
    relative growth rate
    net assimilation rate
    leaf area ratio
    specific leaf area
    leaf weight ratio
    Opis:
    Effect of sowing time on productivity of sunflower was studied. Sunflower seeds were first sown in August (early) and the second sowing was done in September (late). Growth analysis was done at an interval of 5-6 days from germination to maturation. Growth was measured in terms of dry weight and leaf area. Various growth indices like RGR, RLGR, NAR, LAR, LWR, SLA, etc. were calculated. Cubic polynomial was the best fit for all the growth parameters. The dry matter accumulation, leaf area, leaf dry weight and leaf number were significantly more in late grown crop than early grown one. The rate of total dry weight, leaf area and leaf dry weight were higher in late grown crop as compared to early grown one. RGR, RLGR and NAR were higher in the late grown crop from the beginning, which gradually decreased later on, in both the crops. LAR was distinctly more in late grown crop between d 30-40. Changes in SLA were similar to LAR while LWR was more in the beginning and decreased afterwards. RGR showed more correlation with NAR and very low correlation with LAR in both the crops. Thus it is concluded that the late sown crop had better growth, but still, to obtain maximum productivity in sunflower, improvement in RGR and NAR is required.
    Źródło:
    Plant Breeding and Seed Science; 2002, 46, 1; 61-69
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of base pressure behavior in a suddenly expanded duct at supersonic Mach number regimes using statistical analysis
    Autorzy:
    Quadros, J. D.
    Khan, S. A.
    Antony, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122311.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Mach number
    Taguchi
    nozzle pressure ratio
    area ratio
    liczba Macha
    eksperyment Taguchi
    model regresji liniowej
    stosunek powierzchni
    Opis:
    The present experimental evaluation deals with the behavior of base pressure (BP) in a suddenly expanded duct at supersonic Mach number regimes. The experiments have been conducted for two cases viz. Without and with the use of microjets or active control. The plan of experiments was planned as per Taguchi design of experiments for acquiring data in a controlled manner. An L27 orthogonal array and analysis of variance (ANOVA) has been employed to investigate the contribution (in terms of percentage) of distinct process parameters like Mach number (M), Nozzle Pressure Ratio (N), Area Ratio (A) and their interactions affecting base pressure. The correlation between these parameters affecting base pressure has been obtained using multiple linear regression analysis. It has been concluded that the Mach number and area ratio were the factors that had high statistical significance on the behavior of base pressure for both cases. The performances of the developed linear regression models have been validated for accuracy prediction by use of 15 test cases. The performance of both the base pressure models was found to be better with percentage prediction in deviation lying in the range of –12.92% to +15.88% for base pressure without control and –10.27% to +19.23% for base pressure with control.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 4; 59-72
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance characteristics of low global warming potential R134a alternative refrigerants in ejector-expansion refrigeration system
    Autorzy:
    Mishra, S.
    Sarkar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240184.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eco-friendly refrigerant
    two-phase ejector
    optimization
    COP
    area ratio
    critical temperature
    ekologiczny czynnik chłodniczy
    strumienica dwufazowa
    optymalizacja
    stosunek powierzchni
    temperatura krytyczna
    Opis:
    Performance assessment of ejector-expansion vapor compression refrigeration system with eco-friendly R134a alternative refrigerants (R152a, R1234yf, R600a, R600, R290, R161, R32, and propylene) is presented for air-conditioning application. Ejector has been modeled by considering experimental data based correlations of component efficiencies to take care of all irreversibilities. Ejector area ratio has been optimized based on maximum coefficient of performance (COP) for typical air-conditioner operating temperatures. Selected refrigerants have been compared based on area ratio, pressure lift ratio, entrainment ratio, COP, COP improvement and volumetric cooling capacity. Effects of normal boiling point and critical point on the performances have been studied as well. Using ejector as an expansion device, maximum improvement in COP is noted in R1234yf (10.1%), which reduces the COP deviation with R134a (4.5% less in basic cycle and 2.5% less in ejector cycle). Hence, R1234yf seems to be best alternative for ejector expansion system due to its mild flammability and comparable volumetric capacity and cooling COP. refrigerant R161 is superior to R134a in terms of both COP and volumetric cooling capacity, although may be restricted for low capacity application due to its flammability.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 55-72
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Approaches to Develop a High Thrust Ratio in a Single Chamber Dual Thrust Motor Using a Composite Propellant Formulation Based on HTPB/AP/Al
    Autorzy:
    Kurva, R.
    Ukey, S.
    Modgi, M.
    Mehilal, -
    Powiązania:
    https://bibliotekanauki.pl/articles/951488.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    dual thrust ratio
    single chamber
    composite propellant
    high burning rate
    burning surface area
    Opis:
    A high thrust ratio in a single chamber dual thrust motor is required to reach a peak velocity very quickly. To achieve a high thrust ratio in a single chamber dual thrust motor, a composite propellant grain, which acts both as booster and sustainer, based on HTPB/AP/Al (84% solid loading) with low aluminum content and having a burning rate of 25±0.5 mm/s at 7 MPa, was successfully developed. This was studied for viscosity build-up, mechanical and ballistic properties, followed by casting and curing as a single type propellant grain. The high burning surface area was created by making grooves of 3 mm width and 60 mm depth over the surface of the nozzle side of the grain while casting and a prototype, thus obtained, was static tested. The data revealed that a grain with one groove demonstrated a thrust ratio of 8, while two grooves, realized a thrust ratio of 30. The experimental thrust ratio values achieved are also in agreement with the predicted values of the thrust ratio of the same composition.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 917-932
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of synthetic rainfall application with respect to the flow volume at upstream Brantas watershed, East Java Province of Indonesia
    Ocena użycia sztucznego deszczu w relacji do natężenia przepływu w górnej części zlewni Brantas, Prowincja Wschodniej Jawy, Indonezja
    Autorzy:
    Limantara, L. M.
    Harisuseno, D.
    Hapsari, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/292575.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    control area
    double ratio
    flow discharge
    synthetic rainfall
    target area
    dwustosunek
    obszar badań
    obszar kontrolny
    sztuczny deszcz
    wielkość odpływu
    Opis:
    Indonesian Technical Implementation Unit (UPT) of Synthetic Rainfall has modified climate by generating synthetic rainfall from 9th May until 4th June 2013. This unit has cooperated with the Department of Technological Study and Application (BPPT) of Indonesia and Perum Jasa Tirta I and TNI AU Lanud Abdulrachman Saleh. This study intended to increase reservoirs water level in upstream Brantas watershed, one of them is Sutami reservoir. Successive grade evaluation of synthetic rainfall used the method of Double Ratio and Flow Discharge. The target area is upstream Brantas watershed that is represented by 12 rainfall stations and the control area is in the distance of ±30 km from the boundary of upstream Brantas watershed and is represented by 5 rainfall stations. Results show rainfall increasing by 152.05% according to the Double Ratio method and the increase of flow discharge from Sutami reservoir by 74.19% according to the Flow Discharge method.
    Indonezyjski Dział Technicznych Wdrożeń (UPT) Sztucznego Deszczu dokonał modyfikacji klimatu przez wygenerowanie sztucznego deszczu od 9 maja do 4 czerwca 2013 r. Dział ten współpracował z Departamentem Technologicznych Badań i Zastosowań (BPPT) Indonezji oraz z Perum Jasa Tirta I i z TNI AU Lanud Abdulrachman Saleh. Celem badań było podniesienie poziomu wody w zbiornikach na terenie górnej części zlewni Brantas. Jednym z tych zbiorników jest Sutami. Stopniowej oceny sztucznego opadu dokonano, używając metody dwustosunku i metody wielkości odpływu. Obiektem badań była górna część zlewni Brantas reprezentowana przez 12 posterunków pomiaru opadu i obszar kontrolny leżący ok. 30 km od granicy zlewni reprezentowany przez 5 posterunków opadowych. Wyniki wskazują wzrost opadu o 152,05% według metody dwustosunku i wzrost odpływu ze zbiornika Sutami o 74,19% według metody wielkości odpływu.
    Źródło:
    Journal of Water and Land Development; 2017, 35; 129-136
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rainwater Management Solutions and their Impact on Shaping Inner City Areas Undergoing Transformation (Case Study of the ZAC Clichy-Batignolles Area in Paris)
    Autorzy:
    Jóźwik, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/125174.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    new urban development
    Sustainable Urban Water Management
    rainwater harvesting
    wet ditch
    biotope reservoir
    runoff ratio
    degraded areas
    Clichy-Batignolles area
    Opis:
    Proper management of rainwater in cities has a significant impact on improving the environmental conditions: the microclimate of a city by regulating the water cycle and reducing heat islands; developing of biodiversity; increasing health and well-being of residents. The aim of the article was to present the possibilities of improving the environmental conditions in compact urban development areas – those that additionally contribute to the shaping of architecture, and thus combine the ecological, functional, and aesthetic benefits. The article draws attention to the synergy of climate change and the new way of developing urban areas, which was presented on the example of specific solutions functioning on the transformed urban area: Clichy-Batignolles in central Paris – recognized as a model for environmental solutions, labelled Éco-Quartier. The mentioned conditions and solutions were related to the possibility of shaping urban form, with the obligation to discharge some or all of the rainwater on the building plot. On the basis of the calculations made for the runoff ratio in individual quarters, it was found that it is possible to maintain a compact urban structure and effectively manage rain water provided that appropriate engineering and urban solutions are applied. These solutions can have an architectural value. The conclusions from the analyses can be used to formulate guidelines for other European cities, which are increasingly faced with the problem of water scarcity and uncontrolled flooding.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 3; 209-219
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of ASTER data in lithological and lineament mapping of the southern flank of the Central High Atlas in Morocco
    Autorzy:
    Errami, Maryam
    Algouti, Ahmed
    Algouti, Abdellah
    Farah, Abdelouhed
    Agli, Saloua
    Powiązania:
    https://bibliotekanauki.pl/articles/2204372.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Amezri-Amassine area
    PCA
    Principal Component Analysis
    band ratio
    MNF
    Minimum Noise Fraction
    automatic lineament extraction
    Amezri
    Amassine
    analiza głównych składowych
    Opis:
    Geological mapping undoubtedly plays an important role in several studies and remote sensing data are of great significance in geological mapping, particularly in poorly mapped areas situated in inaccessible regions. In the present study, Principal Component Analysis (PCA), Band Rationing (BR) and Minimum Noise Fraction (MNF) algorithms are applied to map lithological units and extract lineaments in the Amezri-Amassine area, by using multispectral ASTER image and global digital elevation model (GDEM) data for the first time. Following preprocessing of ASTER images, advanced image algorithms such as PCA, BR and MNF analyses are applied to the 9ASTER bands. Validation of the resultant maps has relied on matching lithological boundaries and faults in the study area and on the basis of pre-existing geological maps. In addition to the PCA image, a new band-ratio image, 4/6–5/8–4/5, as adopted in the present work, provides high accuracy in discriminating lithological units. The MNF transformation reveals improvement over previous enhancement techniques, in detailing most rock units in the area. Hence, results derived from the enhancement techniques show a good correlation with the existing litho-structural map of the study area. In addition, the present results have allowed to update this map by identifying new lithological units and structural lineaments. Consequently, the methodology followed here has provided satisfactory results and has demonstrated the high potential of multispectral ASTER data for improving lithological discrimination and lineament extraction.
    Źródło:
    Geologos; 2023, 29, 1; 1--20
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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