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匹配条件: “Diliyan Georgiev” ,找到相关结果约346条。
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Eco-physiological Study on the Influence of Contaminated Waters from the Topolnitza River Catchment Area on Some Crops
Iliana Velcheva,Slaveya Petrova,Violeta Dabeva,Diliyan Georgiev
Ecologia Balkanica , 2012,
Abstract: The present study is a small part of a program for an investigation of the water conditions in the Topolnitza Dam Lake, Topolnitza River and its catchment area. The sensitivity of seeds and young wheat, sunflower and mustard plants to heavy metal stress was examined at laboratory conditions. Our results showed that seedling growth was more sensitive to heavy metals in comparison to seed germination. The length of shoot and root has been adversely affected due to water contamination when compared to the control. A certain negative effect on the photosynthetic pigments content was registered.
Blow up of the Solutions of Nonlinear Wave Equation
Svetlin Georgiev Georgiev
Boundary Value Problems , 2007, DOI: 10.1155/2007/42954
Abstract: We construct for every fixed n ¢ ‰ ¥2 the metric gs=h1(r)dt2 ¢ ’h2(r)dr2 ¢ ’k1( ‰)d ‰12 ¢ ’ ¢ ˉ ¢ ’kn ¢ ’1( ‰)d ‰n ¢ ’12, where h1(r), h2(r), ki( ‰), 1 ¢ ‰ ¤i ¢ ‰ ¤n ¢ ’1, are continuous functions, r=|x|, for which we consider the Cauchy problem (utt ¢ ’ ”u)gs=f(u)+g(|x|), where x ¢ ¢ n, n ¢ ‰ ¥2; u(1,x)=u ¢ (x) ¢ L2( ¢ n), ut(1,x)=u1(x) ¢ H ¢ ’1( ¢ n), where f ¢ ° ’ 1( ¢ 1), f(0)=0, a|u| ¢ ‰ ¤f ¢ € 2(u) ¢ ‰ ¤b|u|, g ¢ ° ’ ( ¢ +), g(r) ¢ ‰ ¥0, r=|x|, a and b are positive constants. When g(r) ¢ ‰ 0, we prove that the above Cauchy problem has a nontrivial solution u(t,r) in the form u(t,r)=v(t) ‰(r) for which limt ¢ ’0 ¢ € –u ¢ € –L2([0, ¢ ))= ¢ . When g(r) ¢ ‰ 0, we prove that the above Cauchy problem has a nontrivial solution u(t,r) in the form u(t,r)=v(t) ‰(r) for which limt ¢ ’0 ¢ € –u ¢ € –L2([0, ¢ ))= ¢ .
Blow up of the Solutions of Nonlinear Wave Equation
Georgiev Svetlin Georgiev
Boundary Value Problems , 2007,
Abstract: We construct for every fixed the metric , where , , , , are continuous functions, , for which we consider the Cauchy problem , where , ; , , where , , , , , , and are positive constants. When , we prove that the above Cauchy problem has a nontrivial solution in the form for which . When , we prove that the above Cauchy problem has a nontrivial solution in the form for which .
The Least Action and the Metric of an Organized System
Georgi Georgiev,Iskren Georgiev
Physics , 2010,
Abstract: In this paper we formulate the Least Action Principle for an Organized System as the minimum of the total sum of the actions of all of the elements. This allows us to see how this most basic law of physics determines the development of the system towards states with less action - organized states. Also we state that the metric tensor can describe the specific state of the constraints of the system, which is its actual organization. With this the organization is defined in two ways: 1. A quantitative: the action I. 2. A qualitative: the metric tensor. These two measures can describe the level of development and the specifics of the organization of a system. We consider closed and open systems.
TAXONOMICAL CHARACTERISTICS OF CHUB Leuciscus cephalus (L i n n a e u s , 1758) FROM THE RIVER BABUNA (MACEDONIA)
Simo Georgiev
Ribarstvo : Croatian Journal of Fisheries , 2000,
Abstract: Systematic characteristics of chub L. cephalus are given by an analysis of eight meristic (on 550 specimen) and 23 plastic characteristics (on 588 specimen), of both genders including the non-mature examples from the river of Babuna, right tributary stream of the Vardar river (Aegean sea river-basin). The measurements were carried out according to the Pravdina scheme. The results were compared with the data of former researches of the material from the same river basin, the main river of Vardar or its major tributary streams, as well as on different materials belonging to various populations living in various biotops: small brooks, big lowlands rivers; in still biotops of both types, oligotrophic and eutrophic lakes; and finally in accumulation lakes. The author faced great difficulties while unifying and comparing the plastic characteristics of chub from various biotops, mainly because of lack of complete data made by various authors. The author claims that making a diagnosis regarding the belonging of chub on the level of sub-species only by a morphometric analysis is tricky since such results, when isolated from other systematic criteria such as the zoo-geographic, cito-genetic, bio-chemical ones and so on, can have a dubious scientific value.
STATE OF THE VARDAR RIVER ICHTIOFAUNA BETWEEN 1996-1999
Simo Georgiev
Ribarstvo : Croatian Journal of Fisheries , 2000,
Abstract: The Vardar river is the biggest free flow ecosystem in the central Balkan peninsula. The aim of the study is to define actual state of ichthyocenosis in the Vardar river from the aspect of some species being relatively represented in certain parts of the flow as well as the longitudinal changing of the fish colony. The method of relative share of species approximation according to T i m m e r m a n s (1957) was used. 3019 fish specimen of 24 species, of which 19 autochthonous, collected on 12 profiles showed slight changes compared to the state two decades ago. However, the changes are quite significant if compared to the state seven decades ago. The human factor effect on the autochthonous ichthyofauna in the last five decades is significant. Tectonic, orographic and mineralogical conditions of the river basin cause longitudinal ichthyofaunal zoning of the Vardar river that differs from the standards determined for big European rivers. The actual Vardar river ichthyofauna is dominated by eight autochthonous fish species of the Cyprinidae family: B. peloponnesius, L. cephalus, G. gobio, A. bipunctatus, Ch. nasus, V. vimba, A. alburnus and B. barbus. All these species belong to the broad European range, they are primarily reophylic and ecologically eurivalent. Mediterranean climatic influence has limited effect on ichthyofauna and longitudinal fish arrangement.
For one ritual before and after hundred years
Georgiev Galin
Glasnik Etnografskog Instituta SANU , 2009, DOI: 10.2298/gei0902141g
Abstract: The aim of this text is to present the role of one calendar rite first of all as factor for the development and the position of local Bulgarian communities in the conditions of dynamic social-economic and cultural-historic changes in the beginning of XXI c. The different feast-ritual forms can be examined as part of the strategies of the small ethnic groups for survival and preserving of their ethnocultural identity. The ethnographic researches in the village of Chushmeley (Krinichnoe), Bolgrad region, the district of Odessa, are made in connection with a project of The Ethnographic Institute with Museum-BAS for studding of the Bulgarians in the region of Bessarabia.
Size of marsh frogs in the Eurasian Otter's diet in Southern Bulgaria
Dilian Georgiev
Hystrix : the Italian Journal of Mammalogy , 2008, DOI: 10.4404/hystrix-19.1-4415
Abstract: Our study was carried out in the south of Bulgaria, providing original data on the size of the marsh frog Pelophylax ridibundus (Pallas, 1771) in otter Lutra lutra (Linnaeus, 1758) diet. A method was devised for estimating the size of these anurans found as bone remains in otter spraints. A very strong positive correlation between the ileum’s maximum width and frogs' standard body length was highlighted. The linear regression equation was: standard body length = 10.4 + 14.1 × ileum’s maximum width. The mean body length of marsh frogs in otter spraints was 53.49 mm. During the warm season otters fed on about four times more diverse sized anurans. The size group 41-60 mm always dominated in otter diet, particularly in the cold season. It could be concluded that in the study area otters fed predominantly on juvenile and sub-adult marsh frogs. Riassunto Dimensioni di Pelophylax ridibundus predate dalla lontra nel sud della Bulgaria. La ricerca, condotta nella Bulgaria meridionale, ha fornito dati inediti circa le dimensioni degli esemplari di rana verde maggiore (Pelophylax ridibundus Pallas, 1771) predati dalla lontra Lutra lutra (Linnaeus, 1758), stimate a partire dai resti ossei indigeriti reperibili nelle feci del mustelide. Una netta correlazione positiva è stata evidenziata tra la larghezza massima dell’ileum e la lunghezza totale standard degli esemplari esaminati. La regressione lineare ha fornito l’equazione: lunghezza totale = 10,4 + 14,1 × larghezza massima dell’ileum. La lunghezza media degli esemplari predati è risultata pari a 53,49 mm. Durante la stagione calda, le lontre utilizzano una varietà di taglie quattro volte maggiore che nella stagione fredda. La classe 41-60 mm è risultata sempre predominante, particolarmente nel periodo freddo, suggerendo che le lontre predano soprattutto individui giovani e sub-adulti.
First record of Grossuana angeltsekovi Gl er & Georgiev, 2009 (Gastropoda: Risooidea) from Greece
Dilian Georgiev
ZooNotes , 2013,
Abstract: In this paper it is reported the first finding of a representative of the genus Grossuana from the Greek Rhodopes Mts. – Grossuana angeltsekovi Gl er & Georgiev, 2009 which is and the first record of the species for this country. The locality is a karstic spring, Rodopi county, Papikio Oros, near Vronti (= 4 km N of Kerasia) (445 m a.s.l.). The material is stored in the Hungarian Natural History Museum, Budapest.
A record of Horned viper Vipera ammodytes (L.) in the diet of the Stone marten Martes foina (Erxl.) (Mammalia: Mustelidae) in Bulgaria
Dilian Georgiev
ZooNotes , 2009,
Abstract: Among undigested prey remains in Stone marten’s Martes foina (Erxl.) faeces (n=47), collected in Sakar Mountain (near Sladun Village) a single lower jaw from a Horned viper (Vipera ammodytes) was found. The rest of taxa registered in the Rock marten’s diet among the faecas were: Insceta indet., Lacerta sp., Pseudopus apodus, Aves indet., Dryomis nitedula, Sylvaemus sp., Arvicola terrestris, Microtus sp., and fruits of Rosa sp., Rubus sp., and Pyrus sp. The percent frequency of the main prey groups in the faeces were as follows: Mammalia (n=35, 74.5%), Aves (n=16, 34.0%), Reptilia (n=4, 8.5%), Insecta (n=4, 8.5%), and fruits (n=5, 10.6%).
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