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201.
Witold Gądor Elżbieta Jankowska 《International journal of occupational safety and ergonomics》2013,19(3):361-379
AbstractThis paper presents the results and conclusions from experimental investigations concerning filtration properties of nonwovens. The needled nonwovens were made from polyester fibres (PTE) with average fibre diameter 12 µm and polypropylene fibres (PP) with average fibre diameter 32 μm. Nonwovens were produced out of each of those fibres or out of a mixture of polyester and polypropylene fibres. This paper also presents investigations of nonwoven fabric made of polypropylene fibres (PP) with average fibre diameter 2.6 μm, which was formed according to melt-blown technology. Oil mist, as challenge aerosol, was used to evaluate the performance of filter media at various aerosol velocities. The average oil mist test aerosol particle diameter was 0.3 μm. Filter penetration was measured at oil mist concentration 0.24 g/m3. 相似文献
202.
Portable chainsaws are associated with substantial risk and can cause serious injury to operators, especially during kickback. This paper presents new results from research and analyses conducted regarding the impact between the different properties of wood on this occurrence. In an open area, such differences may include: wood species, humidity, temperature and the facing angle of the wood fibres in relation to the kerf and shape of the wood surface that comes in contact with the tip of the guide bar. This paper investigates chainsaw kickback including the research results on kickback and wood-cutting energy, saw chain speed and the efficiency of the chainsaw engine. It also presents conclusions drawn from the tests that can be useful for chainsaw users, showing the dependencies between the different properties of wood and the risk of injury. 相似文献
203.
Samples of small rodent populations inhabiting Crabapple Island on Beldany Lake in NE Poland revealed that Clethrionomys glareolus was continously present there, whereas Apodemus flavicollis and Microtus agrestis appeared, stayed for some period, vanished and reappeared. It appears that sexually mature females of the bank vole are strictly territorial, their numbers are limited, and immature individuals hardly disperse at high population size. Sexually mature females of the yellow-necked mouse seem to be territorial only at low population numbers, and their numbers increase linearly with population size. Sexually mature females of the field vole exhibit high level of aggregation, and their numbers increase in streight line with growing population size. We discuss the idea that different social organization of the rodent populations is connected with various strategies (sedentary and nomadic) supporting local population persistence. 相似文献
204.
Sophie M. E. Marsh Michael Hoffmann Neil D. Burgess Thomas M. Brooks Daniel W. S. Challender Patricia J. Cremona Craig Hilton-Taylor Flore Lafaye de Micheaux Gabriela Lichtenstein Dilys Roe Monika Böhm 《Conservation biology》2022,36(2):e13844
Unsustainable exploitation of wild species represents a serious threat to biodiversity and to the livelihoods of local communities and Indigenous peoples. However, managed, sustainable use has the potential to forestall extinctions, aid recovery, and meet human needs. We analyzed species-level data for 30,923 species from 13 taxonomic groups on the International Union for Conservation of Nature Red List of Threatened Species to investigate patterns of intentional biological resource use. Forty percent of species (10,098 of 25,009 species from 10 data-sufficient taxonomic groups) were used. The main purposes of use were pets, display animals, horticulture, and human consumption. Intentional use is currently contributing to elevated extinction risk for 28–29% of threatened or near threatened (NT) species (2752–2848 of 9753 species). Intentional use also affected 16% of all species used (1597–1631 of 10,098). However, 72% of used species (7291 of 10,098) were least concern, of which nearly half (3469) also had stable or improving population trends. The remainder were not documented as threatened by biological resource use, including at least 172 threatened or NT species with stable or improving populations. About one-third of species that had use documented as a threat had no targeted species management actions to directly address this threat. To improve use-related red-list data, we suggest small amendments to the relevant classification schemes and required supporting documentation. Our findings on the prevalence of sustainable and unsustainable use, and variation across taxa, can inform international policy making, including the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services, the Convention on Biological Diversity, and the Convention on International Trade in Endangered Species. 相似文献
205.
Pratti Gabriela Montine Resende Detoni Igor dos Reis de Souza Resende Georgio Patrcio Mansur Marcelo Borges Lemos Leandro Rocha da Silva Guilherme Liziero Ruggio 《Journal of Material Cycles and Waste Management》2022,24(2):702-711
Journal of Material Cycles and Waste Management - Fluff is a shredder waste made up mostly of polymeric material generated in semi-integrated steel manufacturing plants, which is usually disposed... 相似文献
206.
de Souza Silva Gabriela Muricy de Carvalho Batista Muniz Izabella Veloso Cristiane Martins Santos Leandro Soares de Melo Neto Biano Alves Bonomo Renata Cristina Ferreira 《Journal of Polymers and the Environment》2022,30(1):246-257
Journal of Polymers and the Environment - Starch is the main predominant food reserve in plants. Its characteristics stand out from other carbohydrates providing it with several industrial... 相似文献
207.
García-Barrera Luisa V. Ortega-Solís Dafne L. Soriano-Giles Gabriela Lopez Nazario Romero-Romero Fernando Reinheimer Eric Varela-Guerrero Victor Ballesteros-Rivas María F. 《Journal of Polymers and the Environment》2022,30(9):3832-3839
Journal of Polymers and the Environment - The objective of this research is to provide a new recycling method for one of the most consumed plastics today, since it is used for the manufacture of a... 相似文献
208.
Mazur Karolina E. Borucka Aleksandra Kaczor Paulina Gądek Szymon Bogucki Rafał Mirzewiński Dariusz Kuciel Stanisław 《Journal of Polymers and the Environment》2022,30(6):2341-2354
Journal of Polymers and the Environment - In the study, polylactide-based (PLA) composites modified with natural particles (wood, bamboo, and cork) and with different levels of infilling (100%,... 相似文献
209.
López Gabriela Riviello Martinez Leila Marina Freyre Laura Freire María Cecilia Vladimirsky Sara Rabossi Alejandro Cisterna Daniel Marcelo 《Food and environmental virology》2021,13(1):64-73
Food and Environmental Virology - Cosaviruses (CoSV) and Saffold cardiovirus (SAFV) are novel members of the Picornaviridae family. The Matanza-Riachuelo river basin covers a total area of 2200 km2... 相似文献
210.
The implementation of eco-toxicological assessment in South America is presently limited due to significant scientific information gaps concerning native species and their potential use as biomarkers. Recently, a common southern hemisphere fish species, Astyanax fasciatus, has been pointed out as a potential bio-indicator to anthropogenic pollution. This is a small, abundant, Neotropical characid, which is widely distributed from Central America south, to the Rio de la Plata Basin of western Uruguay. Our study found a statistically significant increase of coproporphyrin, uroporphyrin and protoporphyrin concentrations in hepatic tissues of A. fasciatus collected from a stream segment with high anthropogenic disturbance (due mainly to agricultural derivatives and motor vehicle transportation activities). Although the area studied showed differences in up and downstream limno-chemical parameters, these differences were not related to the increase of hepatic porphyrin concentrations. Based on the results of our study, we conclude that A. fasciatus is a good bio-indicator of exposure to environmental contaminants, and we propose that this abundant fish species be considered as a sentinel organism for monitoring potential disturbances to freshwater ecosystems. 相似文献