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Wyświetlanie 1-15 z 91
Tytuł:
Reduction in organic matter fractions and structural stability following cultivation of tropical forests in Ethiopia and Nigeria
Autorzy:
Mbagwu, J.S.C.
Piccolo, A.
Powiązania:
https://bibliotekanauki.pl/articles/25479.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic matter
Ethiopia
tropical soil
soil
tropical forest
aggregate stability
Nigeria
Źródło:
International Agrophysics; 2004, 18, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nature and tourism on tropical and subtropical islands
Autorzy:
Jędrusik, Maciej
Wieczorkiewicz, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2029437.pdf
Data publikacji:
2004-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
tourism
tropical islands
nature
Opis:
Tropical and subtropical islands have become an important tourist destination. The islands are concentrated in eight areas of the world. Evaluating the natural tourist potential of these areas, it seems that the most attractive are the islands of Mid and West Indian Ocean and the Polynesia. Yet, these locations are less popular then the theoretically less naturally attractive Caribbean, Mediterranean and East Atlantic islands. This leads to the conclusion that nature is not the most important decisive factor in choosing tourist destinations, and “tourist paradises” are formed on islands regardless of their natural attributes. Tourists are mainly attracted by the “myth” of a tropical island, and the most important criterion is the distance from home and travel time.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2004, 11; 271-280
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial-Temporal Trend Analysis of Rainfall Erosivity and Erosivity Density of Tropical Area in Air Bengkulu Watershed, Indonesia.
Autorzy:
Supriyono, Supriyono
Utaya, Sugeng
Taryana, Didik
Handoyo, Budi
Powiązania:
https://bibliotekanauki.pl/articles/2054939.pdf
Data publikacji:
2021-09-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
erosivity
IDW
tropical
watershed
Opis:
There have been many studies on rainfall erosivity and erosivity density (ED). However, it was not widely developed in Indonesia as a tropical country and has unique precipitation patterns. They are indicators for assessing the potential risk of soil erosion. The Air Bengkulu Watershed is undergoing severe land degradation due to soil erosion. This study aimed to analyze spatial-temporal in rainfall erosivity and ED based on monthly rainfall data (mm). The data used consisted of 19 weather stations during the period 2006–2020 and which are sparsely distributed over the watershed. The analysis was done by using Arnold’s equation. Then, the trend was tested using parametric and non-parametric statistics, and analysed with linear regression equation, and Spearman’s Rho and Mann Kendall’s tests. The spatial distribution of both algorithms was analysed using the inverse distance weighted (IDW) method based on the geographic information system (GIS). Unlike previous research findings, The long-term average monthly rainfall erosivity and ED revealed a general increase and decreasing trend, whereas it was found to be non-signifi- cant when both indices were observed. However, these results indicate a range from 840.94 MJ · mm−1 · ha−1 · h−1 · a−1,552.42 MJ · mm−1 · ha−1 · h−1 · a−1 to 472.09 MJ · mm−1 · ha−1 · h−1 · a−1  in that November month followed by December and April are the most susceptible months for soil erosion. Therefore, The upstream area of the region shows that various anthropogenic activities must be managed properly by taking into account the rainfall erosivity on the environment and that more stringent measures should be followed in soil and water conservation activities.
Źródło:
Quaestiones Geographicae; 2021, 40, 3; 125-142
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basic nutrient requirements of the domestic quails under tropical conditions: A review
Autorzy:
Altine, S.
Sabo, M. N.
Muhammad, N.
Abubakar, A.
Saulawa, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/1182937.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
nutrients
japanese quails
tropical conditions
Opis:
Due to multiple benefits and prolific nature of the domestic quails, a review on basic nutrient requirements is highly relevant. Requirement under tropical conditions for water, protein, essential and non-essential amino acids were reviewed. Other basic requirements that included energy, vitamins, major and micro minerals were also captured.
Źródło:
World Scientific News; 2016, 49, 2; 223-235
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding of surface roughness of wood based on analysis its structure and density
Autorzy:
Jankowska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2200138.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wood roughness
tropical wood
wood structure
Opis:
Understanding of surface roughness of wood based on analysis its structure and density. The main aim of presented paper was to investigate the influence the wood density and anatomical details on surface roughness. The scope of study included samples from ten different species of wood (mainly tropical) because of wide range of density and anatomical difference. The results allow to conclude that the roughness of tested wood species demonstrated variation, depending on the wood section and the measurement direction. In general, radial sections showed higher roughness than tangential sections due to interlocked fibres in tested wood species (fibres cut in various ways on the radial section of the wood). Roughness measured perpendicular to the wood fibres were twice as high as those measured parallel to the grain. Wood density was not an important indicator determining surface roughness for tested wood species. The determining element for the roughness measured across the fibres was the diameter of the vessels. Further research is advisable due to the enormous variability of the structure and properties of wood.
Analiza chropowatości powierzchni drewna w oparciu o analizę jego struktury i gęstości. Celem prezentowanych badań było określenie wpływu gęstości drewna oraz szczegółów budowy strukturalnej na chropowatość powierzchni materiału. Zakresem badań objęto dziesięć różnych gatunków drewna (głównie tropikalnego) ze względu na szeroki zakres gęstości i różnice anatomiczne. Wyniki przeprowadzonych badań pozwalają na stwierdzenie, że chropowatość drewna badanych gatunków wykazywała zmienność w zależności od przekroju drewna i kierunku pomiaru. Przekroje promieniowe wykazywały większą chropowatość, co jest spowodowane zawiłościami w układzie włókien. Chropowatość mierzona prostopadle do włókien drzewnych była dwukrotnie większa niż mierzona równolegle do kierunku przebiegu włókien. Gęstość drewna nie była istotnym wskaźnikiem określającym chropowatość powierzchni badanych gatunków drewna. Elementem determinującym chropowatość mierzoną w poprzek włókien była średnica naczyń. Wskazane są dalsze badania ze względu na ogromną zmienność struktury i właściwości drewna.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 111; 27--31
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Elusive Sustainable Development of Small Tropical Islands
Autorzy:
Jędrusik, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2037644.pdf
Data publikacji:
2014-10-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Sustainable development
islands
tropical islands
Oceania
Opis:
The notion of sustainable development is one of the most popular concepts of our time. However, it remains controversial and quite problematic, especially for small islands and their communities. These challenges arise in relation to the limited scope of resources which can be used for development, and the difficulty of defining the needs of future generations. Looking at the history of many island jurisdictions, one is confronted with a picture of substantial economic evolution. Island communities have rarely, if ever, been able to foresee or plan their future; frequently, the situation has turned out to be very different from any previously envisaged scenarios. This should not be surprising, since small island destinies are often determined by external variables, over which they have little, if any, control. These variables include colonization, competition over scarce territories, improvements in transportation technologies, the information revolution and natural disasters. Thus, the very idea of sustainable development with respect to small islands is nothing but a charming slogan, an entertaining fiction rather than a reachable target. Of course, islands and their communities can take‘green’ initiatives that are more environmentally friendly; they cannot, however, achieve a state of sustainable development, except with a serious deterioration in the quality of life and off-island connectivity (by air or sea) of their residents.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2014, 18, 3; 26-30
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tropical cyclones tracks classification due to their characteristic
Autorzy:
Medyna, P.
Wiśniewski, B.
Kamionowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/360628.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
tropical cyclone
tracks classification
distribution criteria
Opis:
Tropical cyclones tracks on the North Atlantic basin were categorized (years 1989–2009). Standard environmental patterns were used. Authors took into consideration cyclones motion parameters and their changes. Recurving, left-turning, nonrecurving, looping and erratic tracks were described.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 123-130
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree growth over three years in response to monthly rainfall in central Amazonia
Autorzy:
Camargo, Miguel Angelo Branco
Marenco, Ricardo Antonio
Powiązania:
https://bibliotekanauki.pl/articles/956816.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
tropical forest
protium
eschweilera
soil water content
Opis:
In central Amazonia, annual rainfall distribution is characterized by a short mild dry season which is associated with a slight increase in irradiance and decline in relative humidity, but the effect of variations in these variables on tree growth is still unclear. The objective of this study was to determine how tree growth responds to monthly variations in some climate variables in central Amazonia. Trees of Protium hebetatum Daly (18–20 m tall) and Eschweilera collina Eyma (19–27 m tall) were used in the study and monthly growth rates were measured during 36 months (2010–2012). We also measured irradiance, temperature, rainfall, and relative humidity (RH). Eschweilera and Protium grew at similar rates (0.0557 mm month–1). Temperature and irradiance had no effect on tree growth of these species, but there was a trend for tree growth to increase with increasing both monthly rainfall and minimum relative humidity. If the dry season becomes longer and dryer in response to climate change one can expect that trees currently sensitive to mild drought stress will be the more affected.
Źródło:
Dendrobiology; 2017, 78; 10-17
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrophysical properties of ombrotrophic peat under drained peatlands
Autorzy:
Kurnain, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082565.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
drainage
moisture retention
residual porosity
tropical peatland
Opis:
Understanding the processes that control the retention and flow of water in peat soils is critical to the effective management of such soils from both agricultural and ecological perspectives. The water retention properties of peats collected from rubber-cultivated, oil palm-cultivated, and abandoned (uncultivated) areas in the vicinity of Kanamit Barat Village, Pulang Pisau District, Province of Central Kalimantan were characterized using the van Genuchten equation. Based on the parameters of α indicating a change in the water content as water potential changes and n indicating the rate of decreasing water content as water potential becomes more negative, the more decomposed peats in the rubber cultivated peatland lost their water relatively slowly at small negative pressure heads, while less decomposed peats in the oil palm-cultivated and abandoned peatlands lost their water more quickly. This reflects difference of pore-size distribution among different land uses of peatlands. The total volume of water retained by the unsaturated layers in the rubber-cultivated peatland was lower than that in the oil palm-cultivated and abandoned areas. Also, the residual water content was higher in the rubber-cultivated peatland compared to the oil palm-cultivated and abandoned areas. This implies that the proportion of the maximum volume of water being removed decreases as a result of agricultural activities in peatlands. This evidence shows that the moisture state of peat soil is greatly influenced by the degree of peat decomposition and water table fluctuation.
Źródło:
International Agrophysics; 2019, 33, 3; 277-283
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of isolation indicator for explaining tourism arrivals on tropical islands
Autorzy:
Podhorodecka, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2030323.pdf
Data publikacji:
2008-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
isolation indicator
tropical islands
intensity of tourism
Opis:
The aim of the article is verification of possibility of use of UNEP isolation indicator for measuring isolation of tropical islands for tourism purposes. 30 tropical islands were included in the study. The correlation between intensity of tourism movement and isolation indicator by Spearman rank correlation was -0,46. More isolated islands have smaller intensity of tourism movement and less isolated have higher intensity of tourism movement ratio. But there are also exceptions from this rule - territories which are more isolated and with higher intensity of tourism movement such as Maldives and less isolated with the smaller intensity of tourism movement such as Sao Tome and Principe. UNEP isolation indicator is not ideal measure for tourism purposes.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2008, 13; 259-265
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the evolution of tropical islands economies in modern times
Autorzy:
Jędrusik, Maciej
Mikulska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2030363.pdf
Data publikacji:
2006-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Tropical islands
economy
tourism
economic transformation
Oceania
Opis:
Over several centuries the characteristic features of the economies of tropical islands were similar and unchanged. On almost all islands, independently of their genetic type, farming and fishing predominated, sprinkled with inter-island trade. With the European expansion, economies of the islands underwent transformations. The development of transportation and communication contributed to the increased accessibility of islands and to their inclusion into world economy. This phenomenon progressed particularly fast in the second half of the 20th century, when already independent island states often searched for capital necessary for their sovereign existence. Numerous unconventional solutions were proposed, but it was tourism that achieved the greatest triumphs, gradually beginning to dominate in the economy of islands of almost all types.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2006, 12; 243-250
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to organise limited space: Micro-regionalisation of La Digue island (Seychelles)
Autorzy:
Jędrusik, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/947004.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Seychelles
La Digue
insularity
tropical island
regionalisation
Opis:
Islands, especially small ones, are commonly studied as microcosms of natural and social processes. In this article, La Digue island (10 km²) in the Seychelles archipelago was treated as such. An attempt was made to analyse the significance of the natural environment for the features of spatial development under conditions of intense globalisation. For this purpose, functional micro-regions were determined, along with their genesis and evolution. Spatial dynamics and individual features of space are presented as chorème (Brunet 1986). The analysis was based on data from a library query and field observation and field studies in July 2018. Twelve functional regions were determined. Analysis of the distribution and evolution of their functions reveals a high dependence on natural environmental features, especially topography, and thus confirms (at the scale in question) a geographical determinism.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2020, 24, 2; 62-72
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is West Nile Fever a threat for Polish travelers visiting tropical and Mediterranean areas?
Autorzy:
Kludkowska, M.
Paul, M.
Powiązania:
https://bibliotekanauki.pl/articles/6014.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
West Nile fever
mosquito-borne infection
West Nile virus
tropical disease
patient
threat
Polish traveler
tropical area
Mediterranean area
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Presentation of information on tropical cyclone tracks and intensity of their impact in the North Atlantic
Przedstawienie informacji o torach cyklonów tropikalnych i intensywności ich oddziaływania na Północnym Atlantyku
Autorzy:
Medyna, P.
Wiśniewski, B.
Chomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/359254.pdf
Data publikacji:
2010
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cyklon tropikalny
tor
intensywność
tropical cyclone
track
intensity
Opis:
The authors describe methods of presenting seasonal information on the occurrence of cyclones (typical tracks shown on Routing Charts, climatic routes and areas of cyclone formation according to NOAA). Besides, a spatial presentation of weather situations including cyclone tracks and the stages of their development understood as intensities are proposed. The relevant zones have been determined on the basis of cyclone data from 1998-2007. The zones indicate areas of potential tropical disturbances on the ocean, thus depicting the areas of the most probable cyclone threats.
W artykule ukazano sposoby prezentowania sezonowych informacji o występowaniu cyklonów (typowe trasy na mapach Routing Charts, trasy klimatyczne i obszary formowania wg NOAA) oraz zaproponowano przestrzenne przedstawienie sytuacji uwzględniającej tory cyklonów i ich stadia rozwoju jako intensywność. Strefy te wyznaczono na podstawie danych o cyklonach z lat 1998-2007. Obejmują one obszary potencjalnego wystąpienia zaburzeń tropikalnych na oceanie. W ten sposób ukazane są obszary największego prawdopodobieństwa wystąpienia zagrożenia z ich strony.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 21 (93); 67-71
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the 1-2-3 Rule for Calculations of a Vessel’s Route Using Evolutionary Algorithms
Autorzy:
Wiśniewski, B.
Medyna, P.
Chomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/116117.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
tropical cyclones avoidance
Fuzzy Domain
Weather Navigation
Tropical Cyclones
1-2-3 Rule
vessels route
evolutionary algorithms
route planning
Opis:
An example is shown of the 1-2-3 rule application for calculations to determine a route avoiding tropical cyclones. The dynamic programming used is based on regularly received weather reports containing present and forecast data on tropical cyclones. The results were compared with the post factum calculated route which utilized only weather analyses concerning the relevant moments of the voyage and with routes calculated using the cyclone fuzzy domain as an area dangerous to navigation. The calculations were made in the evolutionary algorithms environment.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 2; 143-146
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 91

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