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排序方式: 共有77条查询结果,搜索用时 15 毫秒
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Aeration strategy for controlling grain storage based on simulation and on real data acquisition 总被引:1,自引:0,他引:1
Daniela de Carvalho Lopes Jos Helvecio Martins Adílio Flauzino Lacerda Filho Evandro de Castro Melo Paulo Marcos de Barros Monteiro Daniel Maral de Queiroz 《Computers and Electronics in Agriculture》2008,63(2):140-146
In this work a new control strategy for grain aeration systems was proposed. This strategy was implemented in a software package called AERO and relates four conditions which depend on real time data acquisition and on the process simulation. The main advantage of AERO controller is that it can be used in different geographic regions, during different seasons and with different aeration systems, automatically adjusting its set points. The objectives of AERO controller are to equalize the temperatures inside the bin, to cool the grain mass whenever is possible and to maintain the moisture content under safe conditions. The results showed that the proposed strategy is efficient to achieve these objectives. Moreover, significant energy saving has been achieved with the AERO controller. 相似文献
3.
da Silva Isadora Gonçalves Castoldi Renata de Oliveira Charlo Hamilton César de Souza Miranda Mateus Nunes Thaíssa Dias Cardoso Costa Luciene Lacerda Lemes Ernane Miranda 《Journal of Crop Science and Biotechnology》2020,23(2):191-196
Journal of Crop Science and Biotechnology - The cultivation of sweet corn is expanding in Brazil, but there are serious constraints about the availability of commercial cultivars. The selection of... 相似文献
4.
Eliana Gertrudes Macedo Lemos Cristina Lacerda Soares Petrarolha Silva Humberto Actis Zaidan 《Euphytica》2002,127(2):179-184
Brazil is currently the worlds largest producer of papaya (Carica papayaL.), producing fruits for both the domestic market and export. Only fruits from hermaphrodite plants are marketed because
they have the necessary commercial characteristics, i.e. they are pear-shaped and have thicker flesh and a smaller internal
cavity. Increased papaya yield has been limited mainly by the ratio of female to hermaphrodite (1: 2) plants normally occurring
in orchards. This ratio causes great losses to papaya producers and the identification of the sex of seedlings during the
nursery stage would be an important advance. In our study random amplified polymorphic DNA (RAPD) analysis was used to differentiate
between the sexual forms of three commercial C. papaya cultivars belonging to the Solo group. RAPD assays using the BC210 primer were able to detect hermaphrodites in all of the
cultivars tested. The BC210438molecular marker was much better at papaya sex differentiation than other markers described in the literature.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
5.
Lacerda L. D. Rezende C. E. Aragon G. T. Ovalle A. R. 《Water, air, and soil pollution》1991,57(1):513-520
Water, Air, & Soil Pollution - The export and import of Fe and Cr through a mangrove tidal creek and their further accumulation in bottom sediments were studied in a mangrove forest at the... 相似文献
6.
A survey is presented on the heavy metal contamination of benthic organisms of the Rio de Janeiro coast, SE Brazil. Metal concentrations were different depending on major pollution sources, element, and species analyzed. The highest concentrations of Zn and Cd occurred in moderately industrialized Sepetiba Bay, while Cu presented its highest content in areas receiving urban wastes. The metals Pb, Ni and Mn did not show any difference among areas. The highest concentration of metals, regardeless of site, occurred in barnacles and oysters, due to the high filtering capacity of these organisms, while the lowest concentrations of all metals occurred in algae species. 相似文献
7.
Coutinho MT Bueno LL Sterzik A Fujiwara RT Botelho JR De Maria M Genaro O Linardi PM 《Veterinary parasitology》2005,128(1-2):149-155
The vectorial competence of the tick Rhipicephalus sanguineus is discussed in relation to the epidemiology of canine visceral leishmaniasis, taking into account its strict association with dogs and the low indices of natural infection presented by its known vector, the phlebotomine sand fly Lutzomyia longipalpis. In order to evaluate natural infection by Leishmania chagasi and the infectivity of these parasites in the tick, 39 specimens (6 females, 11 males and 22 nymphs) of R. sanguineus were removed from 21 dogs showing diverse symptoms of zoonotic visceral leishmaniasis (ZVL). Six ticks (15.4%) gave positive results for the genus Leishmania using the PCR technique. To determine the infectivity of the parasites, 36 hamsters were inoculated orally and peritoneally with macerates of ticks removed from nine dogs symptomatic for visceral leishmaniasis. After 6 months the hamsters were sacrificed and necropsied. Serum was removed for IFAT, as well as spleen and liver fragments to make imprint smears and for PCR. Eight (88.9%) of these dogs presented ticks that were infective for 14 hamsters (41.2%), 12 (85.7%) of them infected peritoneally and two (14.3%) orally. PCR revealed 27 smears (40.9%) to be positive, 20 (62.5%) of them infected peritoneally and seven (20.6%) orally. IFAT showed 14 positive animals (41.2%). Based on these findings, we suggest that the vectorial capacity of R. sanguineus for L. chagasi should be evaluated further, opening new perspectives in the epidemiology of ZVL. 相似文献
8.
Oliveira SC de Almeida LA Carvalho NB Oliveira FS Lacerda TL 《Veterinary immunology and immunopathology》2012,148(1-2):129-135
The innate immune system constitutes an efficient defense mechanism against invading microbial pathogens. Recent studies have revealed the intracellular signaling cascades involved in the TLR-initiated immune response to Brucella spp. infection. However, there is a piece of the puzzle missing that is the role of non-TLR receptors in innate immunity. The involvement of TLR receptors in brucellosis has been investigated by different research groups. It was demonstrated that TLR2 clearly does not play any role in controlling Brucella abortus infection in vivo, whereas TLR9 has been shown to be required for clearance of this bacterium in infected mice. The participation of adaptor molecules, such as MyD88 and TRIF has also been discussed. Recently, we and others have reported the critical role of MyD88- and not TRIF-mediated signaling in dendritic cell maturation and in vivo resistance during B. abortus infection. However, the relationship between specific Brucella molecules and non-TLR receptors and signal transduction pathways needs to be better understood. It is now clear that the interaction between TLRs and recently identified cytosolic innate immune sensors is crucial for mounting effective immune responses. Finally, this review discusses the mechanisms used by Brucella to escape detection by the host innate immune system. 相似文献
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Iván Francisco García-Tejero Saray Gutiérrez Gordillo Luciene Souza Simón Cuadros-Tavira Víctor Hugo Durán Zuazo 《Archives of Agronomy and Soil Science》2019,65(2):164-181
This work examines the long-term effects of deficit-irrigation (DI) practices in almond crop (Prunus dulcis Mill.) in agronomical and physiological terms. The trial was conducted during four-year monitoring period (2014–2017), in an experimental orchard (SW Spain), subjected to three irrigation regimes; i) a full-irrigation treatment (FI), which received 100% of crop evapotranspiration (ETC); ii) a regulated-deficit irrigation (RDI50), which received 50% of ETC during the kernel-filling period; and iii) a low-frequency deficit irrigation (LFDI), that was subjected to continuous periods of irrigation-restriction defined in terms of threshold values of leaf-water potential (Ψleaf) during the kernel-filling period. During the water stress period, there were monitored Ψleaf, stomatal conductance (gs) and canopy temperature (TC). Significant improvements in terms of water-use efficiency were found, as no differences in terms of yield between FI and LFDI were found, leading to the conclusion that significant water savings (between 27 and 40%) can be achieved without compromising the yield. Moreover, threshold values of Ψleaf and thermal indicators were defined which will allow establishing future irrigation scheduling without compromising almond yield, especially when DI strategies are being applied. 相似文献