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  • Elsevier (CrossRef)  (139)
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  • 1
    Language: English
    In: Environmental Innovation and Societal Transitions, September 2019, Vol.32, pp.90-106
    Description: This paper examines the establishing a low-carbon electricity system through the introduction of Renewable Energies in Bulgaria – an EU member and a former Socialist state undergoing a vast socio-economic transformation over the last 29 years. Thus, the current introduction of RE is ambivalent. On the one hand, in just five years, a total of more than 1700 MW of new wind and photovoltaic plants were installed - almost as much as the country's nuclear capacity (2000 MW). On the other hand, after 2012, the RE development was stopped by means of several legislative amendments. Thus, governed by tensions, and recently experiencing a financial crisis in the energy sector, unintended new opportunities for RE occurred abroad. This could be a chance for “leapfrogging” pathway to low-carbon transition. Though a challenge still remain in the “state capture” processes in the Bulgarian politics.
    Keywords: Renewable Energy ; Low-Carbon Energy Transition ; Path-Dependencies ; State ; Capture ; Leapfrogging Development ; Bulgaria ; Environmental Sciences
    ISSN: 2210-4224
    E-ISSN: 2210-4232
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  • 2
    Language: English
    In: Journal of Hydrology, November 2018, Vol.566, pp.616-626
    Description: The associations between the seasonal moisture budget (precipitation minus evaporation) and atmospheric and oceanic teleconnections related with dry and wet conditions in the greater Mediterranean Basin are investigated. The driest and wettest Mediterranean winters are selected according to the Standardized Precipitation Index (SPI), and the differences in the moisture budget among them and average conditions (i.e. climatology) are investigated. The analysis focuses on the role of major teleconnection indices for the conditions of the driest/wettest winters. According to the results, the Arctic Oscillation (AO) index is the best indicator of variability in the driest/wettest conditions, which are conventionally associated with the North Atlantic Oscillation (NAO). Large-scale climate variability over the Mediterranean Basin is strongly linked with significant changes of the moisture fluxes in the Gulf of Mexico region and partially in the east coast region of the United States (US), especially for wet years in the Western Mediterranean. The displacement of the prevailing atmospheric centres of action located over the subtropical mid-east Atlantic (Azores high) to the Northwest Atlantic determines the wet conditions over the Western and Eastern Mediterranean Basins, respectively. It is speculated that the relative strengths and positions of these large-scale systems control the Eastern and Western patterns of the Mediterranean climate variability.
    Keywords: Atmospheric Moisture Budget ; Convergence ; Regional and Year to Year Variability ; Teleconnections ; Mediterranean Basin ; Standardized Precipitation Index ; Geography
    ISSN: 0022-1694
    E-ISSN: 1879-2707
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  • 3
    Language: English
    In: Energy Procedia, January 2016, Vol.85, pp.295-302
    Description: The results, obtained from paper based subjective assessment, of the indoor environment parameters, are presented in this paper. The assessment was made by untrained and unprepared occupants of small lecture room, during specially organized one hour lecture. Briefly described are the main objectives, as well as the methods used. The collected data was mostly analyzed in terms of the human response to the questionnaire based study. It was analyzed how successive the votes are and how reliable the answers of the questions are. The results show very low response to the unorganized and spontaneous experimental study. The explanation of these results seems to be complex task, which requires further interdisciplinary analyzes. The work is still in progress, and particular results, concerning the collected vote and the entire physical measurements of the indoor environment parameters, will be presented later on.
    Keywords: Indoor Air Quality ; Thermal Comfort ; Occupant Behavior ; Subjective Assessment ; Experimental Studies ; Engineering ; Economics
    ISSN: 1876-6102
    E-ISSN: 1876-6102
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  • 4
    Language: English
    In: Energy Procedia, March 2017, Vol.112, pp.240-251
    Description: The presented work partly reveals the development stage of a Virtual Thermal Manikin (VTM), equipped with additional breathing functionality. The methods used are based on Computational Fluid Dynamics (CFD) flow simulations and analysis. Real thermal manikins, as well as the VTMs, represent modern, highly complex tools for assessment of the occupants’ thermal comfort, as well as for analyses of indoor air quality in real or virtual enclosed environment. Also, real thermal manikins can be equipped with auxiliary devices that mimic human activities such as breathing, sweating, sneezing, coughing and others. Recent research indicates the development of an advanced compact pneumatic system, designed for implementation in the thermal manikin, capable of simulating the breathing related processes in humans. That is why the development of supplementary functionalities of the VTMs is considered as an important factor in the described research area. Thus, the presented case study reveals CFD based model of human body, with steady state breathing phases simulating the real human breathing processes. The results considering the flow interaction in the breathing zone showed good visual illustration and representation of the real physical processes.
    Keywords: Computational Fluid Dynamics ; Indoor Environment ; Indoor Air Quality ; Virtual Thermal Manikins ; Experimental Studies ; Breathing Cycle ; Engineering ; Economics
    ISSN: 1876-6102
    E-ISSN: 1876-6102
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  • 5
    Language: English
    In: Comprehensive Psychiatry, 2011, Vol.52(3), pp.326-333
    Description: Neurodegenerative dementias represent among the most clinically and pathologically complex syndromes in neuropsychiatry. Phenomenologically protean, and often initially presenting with subtle subsyndromal characteristics, neurodegenerative behavioral syndromes can manifest with an assortment of cognitive, mood, personality, and comportmental changes, often alloyed with elementary neurologic (eg, motor) signs. A range of pathogenic mechanisms (eg, amyloid plaques, Pick bodies, etc) typically underlie corresponding clinical syndromes. However, overlap in both clinical expression and histopathologic comorbidities frequently exist among cortical and subcortical neurodegenerative disorders. Moreover, secondary central nervous system pathologies (eg, cerebrovascular disease) commonly coexist with neurodegenerative processes, further complicating clinical phenomenology-based nosologic categorization. Evolving insight into the etiologic mechanisms of neurodegenerative dementias, and correspondingly improving potential for intervention, require more precise differentiation among dementia subtypes and comprehensive identification of contemporaneous neurodegenerative processes. Increasing appreciation of this diagnostic complexity is prompting the need for renovation of existing diagnostic schemas. We address these issues by reviewing the atypical dementia type known as posterior cortical atrophy. We then use posterior cortical atrophy as an exemplar for renovating neuropsychiatric diagnostic classification to better account for the layered complexity of clinical and pathologic domains needing to be characterized to accurately and completely diagnose neuropsychiatric disturbances.
    Keywords: Medicine ; Psychology
    ISSN: 0010-440X
    E-ISSN: 1532-8384
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  • 6
    Language: English
    In: Géobios, 2008, Vol.41(4), pp.465-492
    Description: The Mokrá-Western Quarry exhibits the rare occurrence of Early Miocene (MN 4) vertebrate fauna within the area of the eastern part of Central Europe. In addition to a rich fauna of reptiles and mammals, two fossiliferous karst joints (Mokrá-Western Quarry, 1/2001 Turtle Joint and Mokrá-Western Quarry, 2/2003 Reptile Joint) yielded a rich fauna of amphibians including 13 amphibian taxa: Salamandridae: sp., sp., type I, sp., type II, aff. , cf. , sp. ( species group), , , Salamandridae gen. and sp. indet.; Pelobatidae: ; Ranidae: sp. (synklepton ); Bufonidae: sp. The first records of the West European species cf. and are reported from the eastern part of Central Europe indicating the wide distribution of those taxa throughout the whole of Europe as early as MN 4. The oldest known record of documents the Early Miocene presence of representatives closely related to the extinct Late Oligocene representatives of . The slow evolution of amphibian species is documented by the presence of cf. and the oldest known occurrence of the extinct salamander . La carrière ouest de Mokrá contient une des rares occurrences de faune de vertébrés du Miocène inférieur (MN 4) de la partie Est d’Europe Centrale. En plus d’une riche faune de reptiles et de mammifères, deux joints karstiques fossilifères (carrière Ouest de Mokrá, 1/2001 « Turtle Joint » et carrière Ouest de Mokrá 2/2003 « Reptile Joint ») ont livré une faune diversifiée d’amphibiens comprenant 13 taxa : Salamandridae : sp., sp., type I, sp., type II, aff. , cf. , sp. (groupe ), , , Salamandridae gen. et sp. indet. ; Pelobatidae :  ; Ranidae ; sp. (synklepton ) ; Bufonidae : sp. Les espèces ouest-européennes cf. et sont enregistrées pour la première fois de la partie Est d’Europe Centrale ce qui démontre la distribution étendue de ces taxa en Europe déjà au MN 4. L’enregistrement le plus ancien de justifie la présence des représentantes du Miocène inférieur étroitement apparentés à représentantes éteintes de de l’Oligocène supérieur. La lente évolution des espèces d’amphibiens est aussi mise en évidence par la présence de cf. et par l’observation la plus ancienne de l’espèce éteinte de salamandre .
    Keywords: Caudata ; Salientia ; Evolution of Assemblages ; Early Miocene ; Central Europe ; Caudata ; Salientia ; Évolution D’assemblages ; Miocène Inférieur ; Europe Centrale ; Geology
    ISSN: 0016-6995
    E-ISSN: 17775728
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  • 7
    Language: English
    In: Tetrahedron: Asymmetry, 2005, Vol.16(18), pp.2993-2997
    Description: The enantiorecognition of 1-aminoindane and -1-amino-2-indanol by ( , )-α,α′-bis(trifluoromethyl)-9,10-anthracenedimethanol is reported. The examination of the bidentate associations between and revealed that the conformation of is responsible for the separation of the NMR signals. Two types of bimodal associations resulted from a conformation when - isomer was tested. Molecular mechanics modelling studies gave the possible structures of the associate species.
    Keywords: Chemistry
    ISSN: 0957-4166
    E-ISSN: 1362-511X
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  • 8
    Language: English
    In: Quaternary International, 26 January 2018, Vol.465, pp.234-250
    Description: This paper combines complex archaeological records from excavations of sandstone rockshelters with paleobotanical investigations in the adjacent wetlands of Northern Bohemia, Czech Republic. Several pollen diagramms from nearby peatbogs are used to document the paleoenvironmental development from the Late Glacial to the Middle Holocene. In addition, two recently excavated key archaeological sections were selected to document human behavioral responses to the climatic development: Kostelní rokle, and Smolný kámen. This region remained mostly unsettled during the Upper Paleolithic (Magdalenian or Epigravettian) so that the Late Paleolithic colonization after the LGM appears to be a major behavioral adaptation. The Early and Middle Mesolithic foragers developed this pattern to be optimally adapted to the versatile landscape of sandstone plateaus and canyons during the Holocene. The aim was to exploit its changing vegetational, aquatic and terrestric faunal resources, until the Late Mesolithic.
    Keywords: Czech Republic ; Sandstone Rockshelters ; Wetlands ; Late Glacial ; Holocene ; Late Paleolithic ; Mesolithic ; Paleoecology ; Lithic Industries ; Geology
    ISSN: 1040-6182
    E-ISSN: 1873-4553
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  • 9
    Language: English
    In: Quaternary International, 10 February 2019, Vol.504, pp.56-69
    Description: Dagmar Cave, Czech Republic, is the first locality in the Moravian Karst where sediments of Cromerian age have been discovered and it is the first locality with such a large number of species of molluscs of this age. It was originally a swallow hole initiated in the Neogene, which has since accumulated sediments. Basal sediments are palaeontologically-sterile stream boulders, originating from weathered Lower Carboniferous rock. After this, fossiliferous, loamy sediments were carried in from the entrance by streams and/or gravity. Molluscan and vertebrate assemblages, along with palynological remains, are indicative of interglacial conditions. Faunal analysis determined that this could only consist of one interglacial, either Cromerian III or IV. This is the first record of Middle Pleistocene molluscan fauna in the Moravian Karst. Palynology demonstrated a humid and thermophilic vegetation typical of a Cromerian interglacial, with forest, and probably water, and an open grassy/bushy area close to the cave. The age is constrained by a MIS 7 U-Th date (182 ka) on the calcite flowstone that overlies the interglacial material and underlies the palaeontologically more sterile upper sediments.
    Keywords: Vertebrates ; Molluscs ; Palynology ; Environmental Change ; Cromerian Interglacials ; Geology
    ISSN: 1040-6182
    E-ISSN: 1873-4553
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  • 10
    Language: English
    In: Journal of Molecular Structure, 2007, Vol.828(1), pp.59-67
    Description: Results are reported from molecular mechanics (MM), molecular dynamics (MD) and a combined mode – MD with a subsequent MM minimization, of the complexes of the chiral solvating agent (CSA) α,α′-bis(trifluoromethyl)-9,10-anthracenedimethanol ( ) in two of its diastereoisomeric forms (( , )- and -) with the substrates (1 ,2 )- and (1 ,2 )- -1-amino-2-indanol ( ). Our computational work was stimulated by preceding NMR study of the enantio differentiation capacity of the CSA manifested in the formation of bidentate complexes with the substrates. The molecular modeling and simulation studies gave possible structures and relative stabilities of the associated species. MM minimizations were sufficient in order to find the lowest energy minima of - /(1 ,2 )- and ( , )- /(1 ,2 )- , while the lowest energy structure of ( , )- /(1 ,2 )- was detected after the MD and MDMM studies. The complexes with the ( , )- isomer have higher total energies than those with - , in accord with an NMR estimate for longer lifetimes of the complexes with - .
    Keywords: Chiral Solvating Agents ; Bidentate Complexes ; Molecular Mechanics ; Molecular Dynamics ; Chemistry ; Physics
    ISSN: 0022-2860
    E-ISSN: 1872-8014
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