Orno-Cotino-Quercetum Pubescentis Ass. nova prov. on the slopes of Titel hill (Serbia)

Studied by many botanists from the floristic and vegetation-geographical aspects over the last hundred years, the herbaceous plant cover in dominant on Titel Hill. The first data on plant communities were registered in 1983, when a significant contribution to the study of vegetation of steppe character was made. At that time, presence of shrubby remnants of forest vegetation on Titel Hill was registered. Since 1983, fragments of typical xerothermic woods of pubescent oak have been registered

Divlje deteline na zaslanjenim staništima Vojvodine

On soil habitats used as pastures and hayfields the presence of wild trefoils is significant. Wild trefoils are important fodder crops and they increase the nutritive value of the plant biomass. 10 out of the 22 species of the genus Trifolium, which are found on the soil habitats in Vojvodina, are shown and they characterize the given ecosystems. Their general distribution is shown as well as their floristical element, distribution in Europe, ecological indices, life form, the major morphological characteristics and their distribution on the soil habitats in Vojvodina.Na slatinskim staništima, koja se koriste kao pašnjaci i senokosi, značajno je prisustvo divljih detelina, koje su važne krmne biljke i povećavaju hranljivu vrednost biljne biomase. Od 22 vrste roda Trifolium, koje su konstatovane na slatinama Vojvodine, prikazane su 10 koje karakterišu date ekosisteme. Dato je njihovo opšte rasprostranjenje, florni element rasprostranjenje u Evropi, ekološki indeksi, životna forma, najvažnije morfološke karakteristike i njihovo rasprostranjenje na slatinama u Vojvodini

Rasprostranjenje vrsta roda Lathyrus L. 1753 (Fabales, Fabaceae) u Vojvodini

Most of the Lathyrus species of the Vojvodina Province arc cultivated for fodder. They are protein-containing herbs which easily recover after grazing. Some perennial species survive in grassland communities for ten years or more. Certain species are important melliferous plants. In the Vojvodina Province, they inhabit different habitats like forests and grasslands, dry and wet sites, thus showing a wide distribution range. Besides their floristic and vegetation aspects, their role as green and dry fodder crops should be emphasized.U radu je dato rasprostranjenje vrste roda Lathyrus u Vojvodini, na UTM kartama sa UTM kodovima i konkretnim lokalitetima. Podaci potiču iz literature koja obuhvata vremenski period od oko 140 godina, Herbarijuma Departmana za biologiju i ekologiju (BUNS) i sopstvenih terenskih istraživanja. Daje se njihov florni element, odnosno areal rasprostranjenja tipovi zemljišta i staništa na kojima rastu, njihov privredni značaj i broj hromozoma. S obzirom da su divlji graškovi značajne krmne biljke, mogle bi biti uključene u gajene ili korišćene u selekciji i oplemenjivanju. U flori Vojvodine raste 16 vrsta roda Lathyrus od kojih 11 njih ima privredni značaj a još dve bi mogle biti koršićene kao krma. U toku je njihovo anatomsko ispitivanje, što će ukazati na nivo ekološke adaptacije i upotrebljivosti u ishrani stoke. Takođe je u toku fiziološka analiza vrsta, analiza makroelemenata, koncentracija pigmenata i intenzitet disanja i fotosinteze od čega zavisi produkcija organske biljne mase

TRY plant trait database – enhanced coverage and open access

Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait‐based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits—almost complete coverage for ‘plant growth form’. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait–environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives

TRY plant trait database – enhanced coverage and open access

Plant traits - the morphological, anatomical, physiological, biochemical and phenological characteristics of plants - determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait‐based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits - almost complete coverage for ‘plant growth form’. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait–environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives

Analysis of GaN MagHEMTs

The simulations, calibration, measured output currents and relative sensitivity of the first-ever fabricated gallium nitride (GaN) magnetic high electron mobility transistors (MagHEMTs) are given in this work. The current imbalance and relative sensitivities obtained from simulations are calibrated against the experimental data measured at room temperature (RT). The average calculated relative sensitivity of the 60 fabricated devices measured is 11.98%T−1. We present three-dimensional simulation results of GaN split-current magnetic sensors for different geometrical and biasing parameters at various ambient temperatures. The detailed analysis of device behaviour is given for each scenario. The relative sensitivity degrades at 400 K (S r = 6.78%T−1) and 500 K (S r = 4.91%T−1) compared to the sensitivity measured at 300 K (S r = 11.98%T−1). The GaN MagHEMTs show promising predicted relative sensitivities at 400 K and 500 K compared to silicon magnetic field effect transistors (MagFETs) operating at much lower temperatures. Moreover, device geometrical parameters are optimised to enhance the relative sensitivity from 11.98%T−1 to 23.29%T−1 using the commercial simulation toolbox Atlas, by Silvaco

Device simulation and optimization of i-GaN capped AlGaN/AlN/GaN HEMT

No abstract available

Analysis of electric power production results in South Serbia: Recommendations for improvement of operation of first mini photovoltaic power plants

Solar radiation in Serbia is for about a third higher than in Middle Europe, which represents a very favorable energy potential. Southeast Serbia is a leading area in this aspect, since the annual average of daily global radiation on a horizontal surface exceeds 4.2 kWh/m2. This paper compares four photovoltaic power plants installed in southeastern Serbia. Analyzes are done based on results from two years of power plant exploitation. The power plants are not located in the same area – there are differences between topography and altitude of their locations, which is also taken into account during analyzes. Photovoltaic modules have different orientation and inclination toward horizontal surface, and their capacity varies from 30-40 kW. The conclusion provides recommendations for improvement of production where it is actually possible

Device simulation and optimization of i-GaN capped AlGaN/AlN/GaN HEMT

No abstract available