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Tytuł:
Procedural justice, job satisfaction and organisational citizenship behaviour within small and medium scale enterprises in Nigeria
Autorzy:
Adebakin, Moruf Akanni
Okon, Samuel Essien
Powiązania:
https://bibliotekanauki.pl/articles/522046.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Job satisfaction
Organisational citizenship behaviour (OCB)
Procedural justice
Small and medium scale enterprises
Opis:
Aim/purpose – This study aims at investigating the incidence of procedural justice, job satisfaction, and organisational citizenship behaviour (OCB) of employees within small and medium scale enterprises (SMEs) in Nigeria. The main thrust of the study is to provide justification for the possible link between these behavioural factors with a view to establishing their roles in fostering SMEs. Design/methodology/approach – A cross-sectional survey design was employed to elicit information from 1420 employees randomly selected from 71 surveyed companies. The responses from the questionnaire were analysed employing correlation and hierarchical regression analysis. Findings – The result showed a significant relationship between procedural justice, job satisfaction, and OCB after controlling for age and gender. The study, therefore, concludes that procedural justice, job satisfaction and citizenship behaviour of SMEs employees are imperative for the success and ultimate survival of SMEs. Research implications/limitations – Understanding the impediments to the growth of SMEs in developing nations require an indebt understanding of some behavioural factors. The study was limited to SMEs in Lagos, Nigeria. Original/value/contribution – The study recommends the need for managers of SMEs to monitor these three behavioural outcomes in other to ensure the sustainability of their businesses. This would in the long run, improve an employment, and reduce poverty. It also provides statistical norms for researchers.
Źródło:
Journal of Economics and Management; 2019, 38; 5-25
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Mercury Used by Artisanal and Small-Scale Gold Mining Processes a Case of River Nile State Sudan
Autorzy:
Ahmed, Ali M.A.
Purwanto, Purwanto
Sunoko, Henna Rya
Powiązania:
https://bibliotekanauki.pl/articles/124413.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
artisanal gold mining
small-scale gold mining
workers occupationally exposed
WOE
residents in surrounding communities
RSC
distribution of mercury concentration
surface soil
surface water
meteorological factors
topographical factors
Opis:
On the discovery of gold reserves in 14 states in Sudan, traditional gold mining suddenly started to flourish and hundreds of thousands of laymen became engaged in gold extraction. The new source of revenue generation added much to the empty treasury and the loss in petroleum revenue due to cessation of the south in 2011 could thus be compensated. Since gold extraction by artisanal and small-scale gold mining does not require much finance or advanced technology, it suited unskilled workers and many young people found their way into the new business. Although gold extraction generates high revenues, the use of mercury in gold extraction poses much threat to the environment and general health of miners and the surrounding areas. The research tries to investigate the effects of traditional gold mining in Alebedia area, Berber Locality in the River Nile State. The investigation includes A/ the effects of extraction methods on the environment and general health. B/ the level of education and its distribution within the miners and how it affected the awareness of the miners about the dangers of mining activities. C/ the period of stay that miners spend in the mining area its contribution on the awareness about the dangers and diseases inflicted on the miners, D/ the effects of traditional gold mining activities on natural environmental impacts and E/ the effects of the meteorological and topographical factors, the distribution and concentration of mercury in the area and their effects on the environment and general health. The research adopted the techniques of using random sampling and quantitative qualitative in addition to the analytical techniques. The research finally concluded that traditional gold mining has positive effects on the economic side and negative effects on the environment and general health.
Źródło:
Journal of Ecological Engineering; 2019, 20, 2; 106-115
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verifying and improving map specifications of river network selection for automatic generalization of small-scale maps
Autorzy:
Ajdacka, Iga
Karsznia, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/2154755.pdf
Data publikacji:
2022-09-19
Wydawca:
Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
Tematy:
cartographic generalization
river network
automation
small-scale maps
Opis:
Automated generalization is highly desired for effective map production. This research focuses on the initial stage of generalization, namely object selection. The study aims to conduct river network automatic selection based on map specifications contained in the Minister of Internal Affairs and Administration regulation. The research covers river network selection from the General Geographic Objects Database from 1:250,000 to 1:500,000 detail level. Within the research scope, three selection variants were designed. The first was a basic variant that only included the implementation of the specifications contained in the regulation. The other two were experimental variants: an extended variant and an extended-modified variant with the parameters and data enrichment proposed by the authors. The extended variant has been supplemented with the Id_MPHP index usage, derived from the Map of Hydrographic Division of Poland (MPHP), which defines the hierarchy of watercourses in the river network. The extended-modified variant was implemented according to the guidelines of the regulation, with the use of the Id_MPHP index and additionally with the help of the parameter denoting “priority” watercourses, which was assigned by the authors. The results of the work constitute the generalization models designed in ArcMap 10.8. with the use of Model Builder functionality as well as the maps presenting the selection variants output visualizations. The results were compared visually as well as verified with the reference atlas map generalized by an experienced cartographer. As a result, the map specifications concerning the selection process presented in the regulation proved to be insufficient to generalize river networks properly. The variants proposed in this research made it possible to improve the selection results and enabled the automation of the river selection process. Additional specifications and parameters proposed in this work may constitute an essential supplement to the guidelines contained in the regulation.
Źródło:
Polish Cartographical Review; 2022, 54, 1; 75-91
2450-6974
Pojawia się w:
Polish Cartographical Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Siting a centralised processing centre for artisanal and small-scale mining - a spatial multi-criteria approach
Autorzy:
Amoah, N.
Stemn, E.
Powiązania:
https://bibliotekanauki.pl/articles/92075.pdf
Data publikacji:
2018
Wydawca:
Główny Instytut Górnictwa
Tematy:
artisanal and small-scale mining
ASM
centralised processing centre
suitability analysis
multi-criteria evaluation
górnictwo tradycyjne i na małą skalę
analiza przydatności
ocena wielokryterialna
Opis:
Artisanal and small-scale mining is one of the global phenomena that is a threat to environmental health and safety. There are ambiguities in the manner in which an ore-processing facility operates. These ambiguities can cause environmental problems and hinder the mining capacity of these miners in Ghana. The vast majority of attempts to address these problems through the establishments of centralised processing centres have failed, with only a handful of successes. This research sought to use an established data-driven, geographic information based system to locate a centralised gold processing facility within the Wassa Amenfi-Prestea Mining Area in the Western region of Ghana. The study was designed to first determine the relevant factors that should be considered in the decision-making process for locating a centralised ore-processing facility. Secondly, it sought to implement the identified factors in a case study by identifying specific geospatial techniques that can best be applied to identify potential sites. By adopting in-depth consultations with four stakeholder groups for data collection and content analysis for data analysis, thirteen relevant factors were identified. However, in the case study, due to data unavailability, only seven of the factors were considered. Geoprocessing techniques including buffering and overlay analysis and multi-criteria decision analysis were employed to develop a model to identify the most preferred locations to site a centralised processing facility. Site characterisations and environmental considerations, incorporating identified constraints, to determine an appropriate location were selected. The final map output indicates estimated potential sites identified for the establishment of a centralised processing centre. The results obtained provide areas suitable for consideration.
Źródło:
Journal of Sustainable Mining; 2018, 17, 4; 215-225
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The small-scale species mobility in calcareous grasslands - example from Southern Poland
Autorzy:
Baba, W
Powiązania:
https://bibliotekanauki.pl/articles/56557.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
small-scale species
Polska
calcareous grassland
plant community
carousel model
community dynamics
Opis:
In this paper I use the different measures of species mobility to describe the fine small-scale dynamics of calcareous grassland built mainly by perennial species and developed in the highly heterogeneous habitat of calcareous rocks. The community showed the low dynamics on a plot-scale (100 m2) and a high one on the scale of 1 m2. However, the studied species differed greatly in calculated indices: turnover rate, (T; 6-64), residence time (RT; 0.5-21.8 y) and carousel time (CT; 4-420 y) as well as the observed tendency to persistence on the spots (PERSIST) and their re-colonisation (AGAIN). This allowed to distinguish the three groups of species: (1) "core species" characterized by high frequency and low T and high CT and RT values, which determine the low dynamics of a community on the plot scale, (2) species with intermediate mobility rate and (3) the group with high mobility rate. The observed cumulative frequencies of all the studied species (CFobs) were much lower than expected under the random re-assignation model (CFRR). Moreover, they were also lower than those predicted by random immigration model (CFRI). The results showed that the "complex carousel" model rather than "single carousel" one explained better the small-scale dynamics of calcareous grasslands.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of establishing a ‘small-scale geopark’: examples from the area of Upper Zemplín (Slovakia)
Możliwość utworzenia małych geoparków: przykłady z obszaru Gór Zemplińskich (Słowacja)
Autorzy:
Baláž, B.
Štrba, L.
Powiązania:
https://bibliotekanauki.pl/articles/128351.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geopark
small-scale geoparks
Zemplín
geotourism
geopark development
małe geoparki
Zemplin
geoturystyka
zagospodarowanie geoparku
Opis:
Within relatively new forms of tourism, geotourism takes a well-established position and is developing worldwide. Hand in hand with the development of geotourism, a demand for defining different types of attractive geotourist locations or regions has arisen. Besides typical geotourist locations (geosites) and regions (geoparks), there are several areas that are geo-attractive and cover several individual geosites, but are too small to be defined as “classical” geoparks. This paper discusses an alternative approach to geotourist development by defining ‘smallscale’ geoparks through the example of the eastern part of Slovakia, near the border with Ukraine. The area is characterized by (1) a variegated geological structure, which includes five main geological units of the Carpathians in Slovakia, where many different- type geosites are located (e.g. mineralogical, hydrogeological, volcanological, paleontological, etc.), (2) presence of historical monuments (e.g. castle ruins), (3) botanical objects and (4) wine-producing areas.
Pośród względnie nowych form turystyki geoturystyka zajmuje ugruntowaną pozycję i rozwija się na całym świecie. Jednocześnie z rozwojem geoturystyki pojawiło się zapotrzebowanie na różne rodzaje atrakcyjnych lokalizacji lub regionów geoturystycznych. Poza typowymi obiektami i obszarami geoturystycznymi (geoparki) istnieje kilka atrakcyjnych obszarów, które są zbyt małe, by mogły być uznane za geoparki. Niniejszy artykuł przedstawia alternatywne podejście do zagospodarowania geoturystycznego w postaci „małych geoparków” na przykładzie wschodniej części Słowacji, przy granicy z Ukrainą. Obszar ten charakteryzuje się: (1) zróżnicowaną budową geologiczną, na którą składa się pięć głównych jednostek strukturalnych Karpat Słowackich, charakteryzujących się zróżnicowanymi obiektami geoturystycznymi (mineralogicznymi, hydrogeologicznymi, wulkanologicznymi, paleontologicznymi, etc.), (2) obecnością zabytków historycznych (np. ruin zamków), (3) obecnością obiektów przyrody ożywionej (roślinność) i (4) obecnością winnic.
Źródło:
Geotourism / Geoturystyka; 2015, 3-4; 57-66
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The hazardous nature of small scale underground mining in Ghana
Autorzy:
Bansah, K. J.
Yalley, A.B.
Dumakor-Dupey, N.
Powiązania:
https://bibliotekanauki.pl/articles/92035.pdf
Data publikacji:
2016
Wydawca:
Główny Instytut Górnictwa
Tematy:
small scale mining
safety
human health
mercury amalgamation
environment
underground
wydobycie na małą skalę
bezpieczeństwo
zdrowie ludzkie
amalgamat rtęci
środowisko
podziemia
Opis:
Small scale mining continues to contribute significantly to the growth of Ghana's economy. However, the sector poses serious dangers to human health and the environment. Ground failures resulting from poorly supported stopes have led to injuries and fatalities in recent times. Dust and fumes from drilling and blasting of ore present health threats due to poor ventilation. Four prominent small scale underground mines were studied to identify the safety issues associated with small scale underground mining in Ghana. It is recognized that small scale underground mining in Ghana is inundated with unsafe acts and conditions including stope collapse, improper choice of working tools, absence of personal protective equipment and land degradation. Inadequate monitoring of the operations and lack of regulatory enforcement by the Minerals Commission of Ghana are major contributing factors to the environmental, safety and national security issues of the operations.
Źródło:
Journal of Sustainable Mining; 2016, 15, 1; 8-25
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of rock fracture under blast loading
Autorzy:
Baranowski, Paweł
Kucewicz, Michał
Pytlik, Mateusz
Małachowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2173700.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Johnson-Holmquist II model
JH-2
rock
blasting
fracture
small-scale testing
model Johnsona-Holmquista II
głazy
strzałowy
pęknięcie
test na małą skalę
Opis:
A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson–Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e141723
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania doświadczalne odkształcalności węzłów szkieletowych budynków drewnianych
Experimental studies of joint deformability in wood light-frame structures
Autorzy:
Baszeń, M.
Powiązania:
https://bibliotekanauki.pl/articles/105538.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
węzły podatne
sztywność
podatność
badanie w skali mikro
semi-rigid joint
joint stiffness
semi-rigidity
small scale experiments
Opis:
Większość obecnie znanych modeli obliczeniowych zawiera uproszczenia, które powodują, że otrzymane dzięki nim wyniki sił wewnętrznych, naprężeń czy przemieszczeń obarczone są pewnymi błędami. Aby uzyskać prawidłowe rozwiązanie analizowanego problemu konieczne jest poznanie rzeczywistego sposobu pracy konstrukcji. Uwzględnianie w obliczeniach węzłów podatnych, ze znanymi wartościami ich podatności, pozwala na otrzymanie rozwiązania dokładnego. Możliwe jest to dzięki badaniom eksperymentalnym. W pracy zostały przedstawione wyniki badań doświadczalnych węzłów w szkieletowych budynkach drewnianych. Badania te przeprowadzono celem wyznaczenia podatności translacyjnej oraz rotacyjnej węzłów. Eksperymenty zostały przeprowadzone na modelach węzłów o zmniejszonych wymiarach poprzecznych w stosunku do rzeczywistych wymiarów elementów drewnianych konstrukcji szkieletowych. Wyniki innych badań doświadczalnych, wykazały, że zarówno eksperymenty na próbkach pełnowymiarowych, jak i małowymiarowych w dobry sposób przedstawiają sposób pracy konstrukcji. Podczas badań rejestrowano wielkości przemieszczeń charakterystycznych punktów w węzłach. Badania podatności translacyjnej i rotacyjnej prowadzone były niezależnie od siebie, na próbkach przedstawiających różne rodzaje węzłów. Podatność translacyjna obliczana była jako stosunek przyrostu przemieszczenia węzła do przyrostu siły obciążającej węzeł. W przypadku węzła z zablokowanym Podatność rotacyjną obliczano jako stosunek przyrostu kąta obrotu elementu obciążanego względem elementu podpierającego do przyrostu momentu zginającego. Podatność translacyjną określano dla dwóch rodzajów węzła, z zablokowanym oraz z możliwym przemieszczeniem w osi działającego obciążenia. Podatność rotacyjną określono natomiast dla różnych grubości obciążanego elementu. Otrzymane wyniki zaprezentowano w postaci wykresów zależności podatność-naprężenia. Powiązanie podatności z naprężeniami podyktowane zostało przeprowadzeniem eksperymentów na próbkach małowymiarowych.
Most of currently known calculation models comprises simplicity. The values of internal forces, stresses or displacements obtained by these models are subjected to be inaccurate. To reach proper solution for analyzed problem it is necessary to recognize real behavior of the structure. The exact solution is possible by complying semi-rigid joints with its stiffness or semi-rigidity (inverse of stiffness) in the calculation model. The value of joint stiffness could be identified by experimental research. The paper presents results of experimental studies of joint behavior in wood light-framed structures. These studies were carried out to define axial and rotational stiffness (and semi-rigidity) of the joints. The experiments was processed on small-scale specimens. The results of other experimental studies showed that both the full-scale and small-scale experiments in a good way illustrate the behavior of the structure. During the tests displacements of specific point of the joints were recorded. The tests of axial and rotational semi-rigidity was carried out independently for different types of joints. The axial semi-rigidity of joint was calculated as the ratio of joint displacement increase to loading force increase, while rotational semi-rigidity as the ratio of joint rotation increase to bending moment increase. The axial semi-rigidity was determined for two types of joint with restricted and permissible displacement in the axis of external load. Rotational semirigidity was determined according to the thickness of rotated element. The obtained results were presented as graphs describing semi-rigidity-to-stress relationships. The semi-rigidity was linked with stress because the tests were not provided on normal dimension specimen.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 4/II; 367-374
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signs and symptoms of mercury-exposed gold miners
Autorzy:
Bose-O'Reilly, Stephan
Bernaudat, Ludovic
Siebert, Uwe
Roider, Gabriele
Nowak, Dennis
Drasch, Gustav
Powiązania:
https://bibliotekanauki.pl/articles/2161852.pdf
Data publikacji:
2017-03-30
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
mercury
chronic mercury intoxication
clinical symptoms
neurological symptoms
artisanal small-scale gold mining
elemental mercury
Opis:
Objectives Gold miners use mercury to extract gold from ore adding liquid mercury to the milled gold-containing ore. This results in a mercury-gold compound, called amalgam. Miners smelt this amalgam to obtain gold, vaporizing it and finally inhaling the toxic mercury fumes. The objective was to merge and analyze data from different projects, to identify typical signs and symptoms of chronic inorganic mercury exposure. Material and Methods Miners and community members from various artisanal small-scale gold mining areas had been examined (Philippines, Mongolia, Tanzania, Zimbabwe, Indonesia). Data of several health assessments were pooled. Urine, blood and hair samples were analyzed for mercury (N = 1252). Questionnaires, standardized medical examinations and neuropsychological tests were used. Participants were grouped into: Controls (N = 209), living in an exposed area (N = 408), working with mercury as panners (N = 181), working with mercury as amalgam burners (N = 454). Chi2 test, linear trend test, Mann-Whitney test, Kruskal-Wallis test, correlation coefficient, Spearman’s rho, and analysis of variance tests were used. An algorithm was used to define participants with chronic mercury intoxication. Results Mean mercury concentrations in all exposed subgroups were elevated and above threshold limits, with amalgam burners showing highest levels. Typical symptoms of chronic metallic mercury intoxication were tremor, ataxia, coordination problems, excessive salivation and metallic taste. Participants from the exposed groups showed poorer results in different neuropsychological tests in comparison to the control group. Fifty-four percent of the high-exposed group (amalgam burners) were diagnosed as being mercury-intoxicated, compared to 0% within the control group (Chi2 p < 0.001). Conclusions Chronic mercury intoxication, with tremor, ataxia and other neurological symptoms together with a raised body burden of mercury was clinically diagnosed in exposed people in artisanal small-scale mining areas. The mercury exposure needs to be urgently reduced. Health care systems need to be prepared for this emerging problem of chronic mercury intoxication among exposed people. Int J Occup Med Environ Health 2017;30(2):249–269
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 2; 249-269
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water scarcity, mountain deforestation and the economic value of water in a small-scale irrigation system: A case study in East Java, Indonesia
Autorzy:
Budiman, Subhan Arif
Rondhi, Mohammad
Khasan, Ahmad Fatikhul
Peratama, Bagus
Rokhani, Rokhani
Suwandari, Anik
Ridjal, Julian Adam
Soemarno, Soemarno
PriJono, Sugeng
Soedarto, Soedarto
Powiązania:
https://bibliotekanauki.pl/articles/15805850.pdf
Data publikacji:
2021-06-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
water scarcity
small-scale irrigation system
contingent valuation method
economic value of water
willingness to pay
Opis:
The purpose of this study was to identify the willingness of farmers to pay for small-scale irrigation (SSI) and its determinants. Additionally, this study analysed the physical water availability in the study area using 16 years’ (2004-2019) historical data of streamflow, rainfall and forest cover change. A structured questionnaire was used to collect the data from 100 farmers. A contingent valuation method was employed to elicit farmers’ willingness to pay (WTP) for irrigation water. The results show that the average WTP of farmers is US$ 215.84/ha/year. It accounts for 20% of farm revenue and is almost 20 times the water fee in large-scale irrigation systems. The study area experienced significant deforestation in the last two decades suffering a decrease of 11.72% of forest cover. It decreases the amount of stored rainwater and decreases the streamflow causing water scarcity during the dry season. Farm size, farmer income, distance to a small dam and usage of water-pump are the significant determinants. The results indicate that water scarcity caused by poor infrastructure increases the economic value of water in a SSI system.
Źródło:
Quaestiones Geographicae; 2021, 40, 2; 153-166
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of hydrotechnical conditions on energy production in small-scale hydropower plants
Wpływ warunków hydrotechnicznych na wielkość produkcji energii w małych elektrowniach wodnych
Autorzy:
Bukowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/293273.pdf
Data publikacji:
2013
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
energy policy
renewable energy sources
small-scale hydropower plants
water flow
małe elektrownie wodne
odnawialne źródła energii
polityka energetyczna
przepływ
Opis:
Polish accession to the EU was followed by a need of adaptation of Polish legislation to the European requirements, also with regard to the energetic sector. The need of achieving 15% share of electric power from renewable sources in the total energy consumption till the year 2010 is a consequence of this decision. This target may be achieved in Polish conditions based on water and wind energy and from biomass combustion. The paper presents the influence of hydrologic conditions and technical parameters on the amount of produced energy. Factors affecting energy production in small hydropower plants were analysed. The formula was proposed to describe the effect of water flow in a river on energy production in small hydropower plants.
Wstąpienie Polski do UE spowodowało konieczność dostosowania polskiego prawa do wymogów unijnych, także w zakresie sektora energetycznego. Konsekwencją tego jest wymóg osiągnięcia 15% udziału energii elektrycznej produkowanej z odnawialnych źródeł energii w całkowitym zużyciu energii w roku 2020.W warunkach polskich cel ten może zostać zrealizowany przede wszystkim dzięki energetyce wodnej, wiatrowej oraz pochodzącej ze spalania biomasy. W artykule przedstawiono wpływ warunków hydrologicznych i parametrów technicznych elektrowni na wielkość produkcji energii elektrycznej. Przedstawiono analizę czynników wpływających na wielkość produkcji energii w małych elektrowniach wodnych. Zaproponowano formułę zależności opisującą wpływ wielkości przepływu całkowitego w rzece na produkcję energii w małych elektrowniach wodnych.
Źródło:
Journal of Water and Land Development; 2013, no. 18 [I-VI]; 29-35
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating technical, allocative and cost efficiencies and their socioeconomic drivers: A case of selected small-scale growers in Northern KwaZulu-Natal, South Africa
Autorzy:
Bulagi, Mushoni
Powiązania:
https://bibliotekanauki.pl/articles/1892143.pdf
Data publikacji:
2020-07-08
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
Data Envelope Analysis, Small-scale grower, Benchmarking, Sugarcane production, Agriculture efficiency, Truncated regression
Opis:
South African small-scale sugarcane growers are faced with high production costs that have an impact on agricultural efficiency and their ability to adopt  newly available technologies for production purposes. This study employed the Data Envelope Analysis (DEA) approach and Truncated regression model to analyse data collected from 160 growers. The findings reported technical, cost and allocative mean scores to be 95.6,% 55.2%, and 57.5% in the Felixton region whereas 95.2%, 69.1% and 72.6% were achieved in the Amatikulu area, respectively. The age, extension support, and off-farm income had a negative effect on agricultural efficiency followed by positive effect of experience, education, access to credit and employment that showed positive relationship. We propose government to work jointly with mill owners to train, develop extension officers and subsidise inputs and equipment to address the poor allocation of resources because of financial constraints currently faced by small-scale sugarcane growers.
Źródło:
Journal of Agribusiness and Rural Development; 2020, 56, 2; 155-162
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Potential of Mercury-Resistant Bacteria Isolated from Small-Scale Gold Mine Tailings for Accumulation of Mercury
Autorzy:
Chasanah, U.
Nuraini, Y.
Handayanto, E.
Powiązania:
https://bibliotekanauki.pl/articles/124273.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mercury-resistant bacteria
small-scale gold mine tailing
Opis:
In certain small-gold mining activities in West Lombok, Indonesia, the tailings containing mercury are discharged to agricultural lands, reducing their productivity. One of the efforts to restore the land is by bioremediation of mercury, using mercury-resistant microbes. This study was aimed to isolate the mercury-resistant bacteria from small-scale gold mine tailings containing mercury, and to test their capability in accumulating mercury. Bacterial isolation and identification were conducted from nutrient broth supplemented with 5 ppm HgCl2. The isolated bacteria were tested for mercury accumulation in the nutrient broth containing 10, 20 and 30 ppm Hg for 24 hours, and in small-scale gold mine tailing containing 41.37 ppm Hg for 2 weeks. The results showed that there were four pure isolates of mercury-resistant bacteria which were identified as Brevundimonas vesicularis, Nitrococcus mobilis, Fusobacterium aquatile and Fusobacterium necrogenes. The highest Hg accumulation from nutrient broth liquid media containing 10, 20 and 30 ppm Hg was observed for Brevundimonas vesicularis. The mercury accumulation efficiency of the four bacteria applied to small-scale gold mine tailing containing mercury was in the order of Fusobacterium aquatile (76.1%) > Brevundimonas vesicularis (75.6%) > Fusobacterium necrogenes (74.4%) > Nitrococcus mobilis (74.2%). On the basis of the Hg accumulation efficiency of more than 75%, Fusobacterium aquatile and Brevundimonas vesicularis are prospective for bioremediation of mercury-contaminated soils.
Źródło:
Journal of Ecological Engineering; 2018, 19, 2; 236-245
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Major Health Risk Factors in Iranian Hand-Woven Carpet Industry
Autorzy:
Choobineh, A.
Shahnavaz, H.
Lahmi, M.
Powiązania:
https://bibliotekanauki.pl/articles/90589.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
small-scale industries
cottage industries
hand-woven carpet industry
industrially developing countries
czynniki ryzyka
zagrożenia zdrowia
wytwarzanie wyrobów włókienniczych
małe przedsiębiorstwo
kraje rozwijające się
tkacz
warsztat
Opis:
This paper reviews the role and importance of small-scale industries together with the issue of occupational health problems and their causes in Iranian hand-woven carpet industry as a typical informal small-scale industry in an industrially developing country. The objective of this paper is to review health risk factors and related occupational health and ergonomic problems in the carpet industry. Since the overwhelming majority of weavers. health problems originate from ergonomic risk factors, it is concluded that any improvement program in this industry should focus on ergonomic aspects. To assess ergonomic conditions in weaving workshops, a checklist has been developed and an ergonomics index indicating the ergonomic conditions of the workshop has been proposed. To test and verify the checklist, 50 weaving workshops were visited and their ergonomic conditions were assessed. Based on the results some modifications were made and the checklist was shown to be an effective tool.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 65-78
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 76

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