1,720,975 research outputs found
Biologija muha i njihovo suzbijanje
No full textMuhe (Muscidae) su porodica srednje velikih do velikih dvokrilaca (Diptera). Do sada je opisano oko 120.000 različitih vrsta muha koje nastanjuju gotovo sve ekosustave. Tijelo muha je prekriveno čvrstom hitinskom kutikulom, a tvore ga glava (caput), prsa (thorax) i zadak (abdomen). Muhe se razmnožavaju potpunom preobrazbom što znači da muha prolazi slijedeće razvojne stadije: jaje, ličinka (larva), kukuljica (pupa) i odrasla jedinka (adult). Ovisno o načinu prehrane, postoje dvije glavne skupine muha, muhe koje bodu i muhe koje ližu hranu. Nnekoliko je vrsta muha koje bodu i sišu krv, a za naše područje najvažnije su konjska muha (Chrysops discalis), stajska muha (Stomoxys calcitrans) te mušice svrbljivice (Simuliidae). Većina vrsta muha ne bodu i ne sišu krv domaćina. One su se prilagodile raznim nišama unutar ljudskih naselja, što im omogućava rast, razvoj i razmnožavanje. Ove vrste muha nazivaju se još i ''prljave muhe'', a u tu skupinu spadaju muhe iz porodice Calliphoridae (muhe zujare), Sarcophagidae (muhe mesare) i Muscidae (kućna muha). Zbog načina života muha i njihovog zadržavanja u blizini ljudi, vrlo je važan zdravstveni značaj muha. Muha na svom tijelu nosi razne nečistoće i mikroorganizme te ih tako prenosi na hranu ljudi, a prijenos je mehanički. Na taj način može prenijeti i različite uzročnike zaraznih bolesti. Neke od uzročnika bolesti koje mogu prenijeti su Salmonella typhi, različiti sojevi Shigella koji uzrokuju bacilarne dizenterije, polio virus, jajašca crijevnih parazita i mnogi drugi. Zbog javnozdravstvenog značaja, populacije muha važno je svesti na broj koji ne ugrožava kvalitetu života i ljudsko zdravlje. Stoga postoji niz metoda suzbijanja, a podijeljene su u tri glavne skupine: mehaničke, kemijske i biološke metode. Cilj rada bio je odrediti rodove (ako je moguće i vrste) muha koje se pojavljuju unutar i oko odabranog gospodarskog prostora u kojem se nalaze životinje te predložiti optimalne metode suzbijanja muha s obzirom na promatrani prostor. U istraživanju smo koristili ljepljive ploče za hvatanje muha na prostoru gospodarskog objekta. Određeni su rodovi i vrste prikupljenih muha te predložene metode suzbijanja
Mathematical modeling of process liquor flow and acetoclastic methanogenesis under mesophilic conditions in a two-phase biogas reactor
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Do two-phase biogas plants separate anaerobic digestion phases? - A mathematical model for the distribution of anaerobic digestion phases among reactor stages
No full textEffective diffusivity in membranes with tetrakaidekahedral cells with implications for the permeability of the human stratum corneum
No full textVariations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Two dimensionale plastic waves in quasi rate independent viscoplastic materials
No full textThe subject of this work is an analysis of the experimental biaxial Hopkinson bar technique when such a device consists of a cruciform tensile specimen surrounded by four very long elastic bars. Unlike commonly applied by-pass analysis which attempts to draw conclusions from behavior of elastic bars we attempt to take into account real plastic waves inside the specimen with few hundreds of reflections. A quasi rate-independent as well as a more general rate-dependent tensor function model for ASME 537 steel are applied. Plastic wave speeds non-existent in traditional elasto-viscoplasticity are analyzed. Some preliminary numerical results for symmetric and non-symmetric loading cases valid for initial and subsequent elastic ranges are given
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