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Wyszukujesz frazę "Dimitrova, V." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Biomass of the xerothermic oak ecosystem on a site of community importance, BG0001040 "Zapadna Stara Planina i Predbalkan", Bulgaria
    Autorzy:
    Lyubenova, M.
    Dimitrova, V.
    Georgieva, N.
    Dimitrov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/52482.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    biomass
    xerothermic plant
    forest ecosystem
    oak
    plant community
    Quercus frainetto-Quercus cerris forest
    Zapadna Stara Planina i Predbalkan area
    Natura 2000 area
    Bulgaria
    Opis:
    The belowground and aboveground biomass was estimated for the tree story, sproutsand seedling regeneration in a representative Quercus frainetto – Quercus cerris ecosystem on “Zapadna Stara planina i Predbalkan”, a Site of Community Importance (SCI). The biomass was measured by destructive sampling (on sample or “model trees” representing three calculated density classes for each species and cut at the stump) of leaves, annual and perennial branches, wood, bark and root components. The belowground (root) biomass was also calculated from a subsample. The data obtained were compared to the results of previous studies and the values on the Bazilevich and Rodin [1971] scale. The ecological status of the forest ecosystem studied and its functional efficiency are discussed based on the study results and specific climate data.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of sources in newspaper coverage of the 2009 Bulgarian parliamentary election
    Autorzy:
    Dimitrova, Daniela V.
    Kostadinova, Petia
    Powiązania:
    https://bibliotekanauki.pl/articles/470916.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Komunikacji Społecznej
    Tematy:
    sources
    Bulgarian press
    election news
    political communication
    Opis:
    Although the importance of news sources is widely acknowledged in journalism and political communication, few studies have examined source use in election news reporting in Bulgaria. Based on a content analysis of the two national dailies with the highest circulation, the present study demonstrates that domestic politicians vastly outnumber other types of sources. In addition, election news articles rarely incorporate more than one news source, thus limiting the diversity of opinions in the press. Such coverage may potentially lead to a narrowing of the range of discussion about political issues and give national political elites the power to define the issues for the public.
    Źródło:
    Central European Journal of Communication; 2012, 5, 1(8); 79-90
    1899-5101
    Pojawia się w:
    Central European Journal of Communication
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problemy minimalizacji mocy pobieranej przez układy logiki programowalnej
    Problems of minimization of power consumed by programmable logic devices
    Autorzy:
    Dimitrova-Grekov, T.
    Solov'ev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/341043.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    logika programowalna
    utrata energii
    programmable logic
    power dissipation
    Opis:
    Przedstawiona praca prezentuje problematykę energii w schematach logiki programowalnej. Pokazane są najpopularniejsze aspekty nowoczesnych metod minimalizacji mocy pobieranej przez schematy sekwencyjne. Analiza różnych metod pokazuje w najszerszej perspektywie możliwości badań dotyczących zarządzania energią pobieraną, konsumowaną i traconą.
    The problems of the consumed in the sequential logic power also deferent methods of their solving are addressed. Also the low-power techniques, used in different levels of the technology are considered. The aim of the work is to systematize the most popular, known methods and to show the ways of development it at the branch of the programmable logic.
    Źródło:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2002, Z.1; 21-29
    1644-0331
    Pojawia się w:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda zdalnego zarządzania robotami mobilnymi
    A remote controlled system based on education robots
    Autorzy:
    Żukowska, I.
    Dimitrova-Grekow, T.
    Salauyou, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/158582.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    robot mobilny
    sterowanie przez Internet
    śledzenie obiektów
    robot edukacyjny
    rozszerzony filtr Kalmana
    mobile robots
    remote Internet control
    object tracking
    educational robots
    extended Kalman filter
    Opis:
    Artykuł przedstawia badania efektywności zarządzania układami mobilnymi przez Internet oraz testowanie skuteczności algorytmu śledzenia robota sterowanego zdalnie. Eksperymenty zostały przeprowadzone na zrealizowanym do tego celu systemie - serwis internetowy oferujący przeprowadzanie gry pomiędzy dwoma, zdalnie sterowanymi robotami. Do wykonania powyższych założeń wykorzystany został statystyczny algorytm śledzenia punktu oparty o rozszerzony filtr Kalmana. Przeprowadzono szereg testów.
    The paper presents an analysis of the effectiveness of mobile system management via the Internet [1] and testing of the effectiveness of the tracking algorithm robot controlled remotely [2, 3]. A object tracking algorithm based on the Extended Kalman Filter is implemented into a game for two robots (Fig. 1). The project proves the efficiency of the robot control and the EKF accuracy by observing and analyzing the work of the internet service, which allows two remote-controlled robots to take a part in the game [8]. Similar examples are in medicine [5] as well as international research and education [6]. All of them use advanced robotics technologies [4, 7, 9]. The robot used in the experiments is an educational robot Mindstorms NXT and in this paper we prove that it also gives many possibilities to achieve interesting results in robot remote-control and human-robot interaction (Fig. 2). In the case of tests for the reaction time of the robot on request, one can draw positive conclusions. In situations where no response is required from the server, the response time of the systems to commands from the remote computers is instant. The effectiveness of the tracking algorithm for the remote-controlled robot was tested by conducting a series of tests. They showed a proportional dependency between the velocity of the robots and the coordinate errors (Figs. 3 and 4). A possible direction of development of the system may be the use of more advanced Internet technologies, which could accelerate communication between a client and a server.
    Źródło:
    Pomiary Automatyka Kontrola; 2014, R. 60, nr 7, 7; 492-494
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indoor Mapping Using Sonar Sensor and Otsu Method
    Autorzy:
    Dimitrova-Grekow, T.
    Salauyou, V.
    Kowalski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114466.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mapping
    sonar
    Otsu's method
    education robot
    Opis:
    In this paper we present an indoor mapping algorithm based on sonar sensor. The overall object detection and mapping experiment is based on small scale local spatial information which has been accomplished in a 2D geometrical map. Considering all drawbacks and pluses of ultrasonic sensors, we present an innovative mapping approach, applying the Otsu’s method and Hit-or-Miss for sonar-data processing. The collected data are treated as a gray-scale picture. For its binarization, we applied the well-known for vision-based systems threshold calculation. Then also the morphology effect, what rises additionally the mapping accuracy, as is shown at the end of the paper. The robot is based on the education construction set LEGO Mindstorms EV3 intelligent brick on ev3dev - a Debian Linux-based operating system and Python 2.0 have been used for programming. The results are evaluated and compared with the real space.
    Źródło:
    Measurement Automation Monitoring; 2017, 63, 6; 214-216
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Height-diameter relationship of plantation-grown juvenile black locust trees is differentiated according to their growth rate, which is positively affected by spacing
    Autorzy:
    Stankova, T.
    Dimitrova, P.
    Gyuleva, V.
    Stefanova, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/28407567.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badawczy Leśnictwa
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 4; 195-205
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioinformatic insight into Portulaca oleracea L. (Purslane) of Bulgarian and Greek origin
    Autorzy:
    Balabanova, V.
    Hristov, I.
    Zheleva-Dimitrova, D.
    Sugareva, P.
    Lozanov, V.
    Gevrenova, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2117810.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Portulaca oleracea
    LC–HRAMS
    secondary metabolites
    descriptive analysis
    multivariate statistics
    Opis:
    Portulaca oleracea L. (Portulacaceae) is used as functional food and its nutritional and therapeutic properties are related to the high levels of organic and fatty acids, polyphenols, polysaccharides and cyclo-dopa amides. This study presents a strategy based on liquid chromatography – high resolution accurate mass spectrometry method (LC – HRAMS) and bioinformatic methods to analyze 33 purslane accessions originating from 11 floristic regions in Bulgaria together with 5 accessions of Greek provenance. Extracts were obtained by microwave extraction. Based on the LC-MS metabolic “fingerprints” of assayed samples, a purslane metabolic database was developed. LC-MS data were proceeded with Software application Compound Discover 2.0 (Thermo Fischer Sci., USA). Principal Component Analysis (PCA) combined with both descriptive and differential analyses were used to find marker metabolites to distinguish different geographical regions. The differential analysis of the Bulgarian and Greek samples allowed the identification of 50 marker metabolites. Based on accurate masses, retention times, fragmentation patterns in MS/MS, comparison with commercial standards and literature data, these secondary metabolites were identified after detailed analysis of Volcano-plots. For the first time, 29 compounds are reported. The identified compounds were used to perform a study of the biosynthetic pathways of purslane secondary metabolites using Kyoto Encyclopedia of Genes and Genomes (KEGG) software platform. The statistical treatments identified marker compounds that can be used to distinguish the origin of accession set. Combining LC-MS data with multivariate statistical analysis was shown to be effective in studying the purslane metabolites, allowing for integration of chemistry with geographic origin.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2020, 62, 1; 7-21
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feeding value of de-hulled sunflower seed meal for broilers
    Autorzy:
    Karkelanov, N.
    Chobanova, S.
    Dimitrova, K.
    Whiting, I.M.
    Rose, S.P.
    Pirgozliev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083777.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sunflower seed meal
    broiler chickens
    protein digestibility
    metabolizable energy
    Opis:
    The effects of de-hulled sunflower seed meal (SFM) samples with different crude protein (CP) and non-starch polysaccharide (NSP) content on apparent metabolizable energy (AME), AME metabolizability (EM) and pre-caecal protein digestibility (pcPD) were examined. The birds were fed one of four mash diets. On a per kilogram basis, the basal diet (BD) contained as major ingredients 549.5 g wheat, 150 g soybean meal and 175 g full fat soybean meal as well as 215.4 g crude protein kg–1 and 12.81 MJ AME kg–1. Another three diets containing 200 g kg–1 of each of three experimental SFM samples in place of the BD were also mixed. Each diet was fed to birds in ten pens with two male Ross 308 broilers ranging in age from 8 to 21 days. Dietary AME was determined from excreta collection between days 17 and 21, while AME, EM and pcPD were determined when the birds were 21 days old. The substitutional method was used to determine AME, EM and pcPD in the SFM samples. The SFM samples high in NSP had lower AME (P = 0.001), EM (P < 0.001) and pcPD (P = 0.005). The beneficial effect of carrying out a further de-hulling of SFM seems to be mediated through reduced NSP content and improved energy and protein bioavailability.
    Źródło:
    Acta Agrophysica; 2020, 27; 31-38
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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