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  • 1
    Online-Ressource
    Online-Ressource
    World Scientific Pub Co Pte Ltd ; 2020
    In:  Journal of Mechanics in Medicine and Biology Vol. 20, No. 08 ( 2020-10), p. 2030001-
    In: Journal of Mechanics in Medicine and Biology, World Scientific Pub Co Pte Ltd, Vol. 20, No. 08 ( 2020-10), p. 2030001-
    Kurzfassung: In this paper, problems concerning the uniaxial experimental investigation of the human abdominal aortic aneurysm (AAA) biomechanical characteristics, concomitant values of the associated Cauchy stress, failure (ultimate) stress in AAA, and the constitutive modeling of AAA are considered. The aim of this paper is to review and compare the disposable experimental data, to reveal the reasons for the high dissipation of the results between studies, and to propound some unification criteria. We examined 22 literature sources published between 1994 and 2017 and compared their results, including our own results. The experiments in the reviewed literature have been designed to obtain the stress–strain characteristics and the failure (ultimate) stress and strain of the aneurysmal tissue. A variety of forms of the strain–energy function (SEF) have been applied in the considered studies to model the biomechanical behavior of the aneurysmal wall. The specimen condition and physical parameters, the experimental protocols, the failure stress and strain, and SEFs differ between studies, contributing to the differences between the final results. We propound some criteria and suggestions for the unification of the experiments leading to the comparable results.
    Materialart: Online-Ressource
    ISSN: 0219-5194 , 1793-6810
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2020
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
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    Peytchinski Publishing Ltd. ; 2021
    In:  Journal of IMAB - Annual Proceeding (Scientific Papers) Vol. 27, No. 1 ( 2021-03-25), p. 3643-3651
    In: Journal of IMAB - Annual Proceeding (Scientific Papers), Peytchinski Publishing Ltd., Vol. 27, No. 1 ( 2021-03-25), p. 3643-3651
    Kurzfassung: Purpose: The aim of the study was to establish the socio-demographic and professional characteristics of the sample of dental assistants and their contributions to the efficiency of dental teamwork. Material and methods: An anonymous inquiry was conducted among 108 dental assistants working in dental offices in 4 Bulgarian cities. The questionnaire consisted of 18 questions about socio-demographic and professional characteristics of the sample and their opinion about obligations, positives and negatives in the workplace, and efficiency of teamwork. The methods used in the survey were sociological (poll) and statistical (alternative analysis). Results: The socio-demographic and professional characteristics of the surveyed dental assistants were established, such as: gender and age distribution, work in active working age/pension, types of working places, location of practices, types of education and number of dentists working with over the period of their work experience. All respondents reported that they assisted the physicians in the treatment process and the majorityf them (70.37- 85.19%) cleaned, disinfected and sterilized the instruments, the workplace and the premises of the practice. Only 4.6% dealt financialelations with the patients and worked directly in their mouths. The opinion of the respondents for building a well-functioning dental team was that both the personal and professional qualities of the team members were essential. Conclusions: Dental assistants were convinced of the benefits of their assistance; between 79.6% and 58.3% of them believed that they had contributed for quicker and better job of the doctor and to patient'somfort.
    Materialart: Online-Ressource
    ISSN: 1312-773X
    URL: Issue
    Sprache: Unbekannt
    Verlag: Peytchinski Publishing Ltd.
    Publikationsdatum: 2021
    ZDB Id: 2724123-3
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
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    Peytchinski Publishing Ltd. ; 2021
    In:  Journal of IMAB - Annual Proceeding (Scientific Papers) Vol. 27, No. 2 ( 2021-04-01), p. 3663-3667
    In: Journal of IMAB - Annual Proceeding (Scientific Papers), Peytchinski Publishing Ltd., Vol. 27, No. 2 ( 2021-04-01), p. 3663-3667
    Kurzfassung: PURPOSE: To compare the opinion of dentists and dental assistants about the advantagesf teamwork. MATERIAL AND METHODS: We conducted an anonymous survey of 110 dental practitioners and 108 dental assistants in four cities in Bulgaria. The questionnaires for the two groups include several identical questions that allow the respondents' opinions to be compared. The methods used are sociological (poll) and statistical (alternative analysis). RESULTS: The majority of dental assistants - 75% are convinced that every dentist should work with an assistant, while 58.6% of the doctors are of the same opinion. Almost the same number of surveyed doctors and dental assistants - mentioned as a strength of the teamwork a relief of the doctor's work (80.90 and 79.63%), an increase in the volume (68.18 and 57.40%) and quality (53.63 and 54.62%) of the medical activity and a reduction in working time (54.54 and 55.62 %). For dentists, the most important factors for creating a goodeam are observing rights and obligations (68.5%), mutual respect (67.6 %) and a relaxedork atmosphere (56.8%). For dental assistants, the most important factors for effective teamwork are mutual respect (74.1%) and the professionalualities of the dentist (72.2%). CONCLUSION: The results show a positive attitude of dental doctors and assistants to teamwork, albeit with varying degrees of conviction.
    Materialart: Online-Ressource
    ISSN: 1312-773X
    URL: Issue
    Sprache: Unbekannt
    Verlag: Peytchinski Publishing Ltd.
    Publikationsdatum: 2021
    ZDB Id: 2724123-3
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
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    Frontiers Media SA ; 2021
    In:  Frontiers in Earth Science Vol. 9 ( 2021-7-6)
    In: Frontiers in Earth Science, Frontiers Media SA, Vol. 9 ( 2021-7-6)
    Kurzfassung: Arctic deltas and their river channels are characterized by three components of the cryosphere: snow, river ice, and permafrost, making them especially sensitive to ongoing climate change. Thinning river ice and rising river water temperatures may affect the thermal state of permafrost beneath the riverbed, with consequences for delta hydrology, erosion, and sediment transport. In this study, we use optical and radar remote sensing to map ice frozen to the riverbed (bedfast ice) vs. ice, resting on top of the unfrozen water layer (floating or so-called serpentine ice) within the Arctic’s largest delta, the Lena River Delta. The optical data is used to differentiate elevated floating ice from bedfast ice, which is flooded ice during the spring melt, while radar data is used to differentiate floating from bedfast ice during the winter months. We use numerical modeling and geophysical field surveys to investigate the temperature field and sediment properties beneath the riverbed. Our results show that the serpentine ice identified with both types of remote sensing spatially coincides with the location of thawed riverbed sediment observed with in situ geoelectrical measurements and as simulated with the thermal model. Besides insight into sub-river thermal properties, our study shows the potential of remote sensing for identifying river channels with active sub-ice flow during winter vs. channels, presumably disconnected for winter water flow. Furthermore, our results provide viable information for the summer navigation for shallow-draught vessels.
    Materialart: Online-Ressource
    ISSN: 2296-6463
    Sprache: Unbekannt
    Verlag: Frontiers Media SA
    Publikationsdatum: 2021
    ZDB Id: 2741235-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
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    Institute of Electrical and Electronics Engineers (IEEE) ; 2016
    In:  IEEE Transactions on Geoscience and Remote Sensing Vol. 54, No. 9 ( 2016-9), p. 5588-5601
    In: IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers (IEEE), Vol. 54, No. 9 ( 2016-9), p. 5588-5601
    Materialart: Online-Ressource
    ISSN: 0196-2892 , 1558-0644
    Sprache: Unbekannt
    Verlag: Institute of Electrical and Electronics Engineers (IEEE)
    Publikationsdatum: 2016
    ZDB Id: 2027520-1
    SSG: 16,13
    SSG: 13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    Knowledge E DMCC ; 2020
    In:  KnE Social Sciences ( 2020-01-30)
    In: KnE Social Sciences, Knowledge E DMCC, ( 2020-01-30)
    Kurzfassung: The article presents an analysis of online interactions among teenagers. The development of online communication is an important factor in the process of formation and reproduction of new social ties and relationships. Continuous online communication is becoming an important feature of everyday life. Online communication affects communication in general, developing its new requirements and standards. The polymetodic research consists of a questionnaire survey method and a content analysis method. The questionnaire was conducted among 50 teenagers aged 13-15, studying in schools of Ekaterinburg and regularly using the Internet to communicate with peers. A content analysis of online dialogs (n = 40) presented by the survey participants was also conducted. The research data proclaims social networks to be the most efficient tool of communication among modern teenagers. The most popular one is Vkontakte, which is used to chat and learn modern vocabulary. The daily routine, including the learning process, is the main topic of communication. Teenagers hardly change their speech behavior, since online and offline communication occurs mainly in the same reference groups. Teenagers also use audio-visual materials, emojis, stickers, etc., to complete their messages and express their emotional state. Keywords: online communication, teenagers, speech behavior, multimodality
    Materialart: Online-Ressource
    ISSN: 2518-668X
    Sprache: Unbekannt
    Verlag: Knowledge E DMCC
    Publikationsdatum: 2020
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
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    Elsevier BV ; 2019
    In:  Remote Sensing of Environment Vol. 231 ( 2019-09), p. 111251-
    In: Remote Sensing of Environment, Elsevier BV, Vol. 231 ( 2019-09), p. 111251-
    Materialart: Online-Ressource
    ISSN: 0034-4257
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2019
    ZDB Id: 1498713-2
    SSG: 11
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    In: Remote Sensing, MDPI AG, Vol. 10, No. 9 ( 2018-08-27), p. 1360-
    Kurzfassung: Low-land permafrost areas are subject to intense freeze-thaw cycles and characterized by remarkable surface displacement. We used Sentinel-1 SAR interferometry (InSAR) in order to analyse the summer surface displacement over four spots in the Arctic and Antarctica since 2015. Choosing floodplain or outcrop areas as the reference for the InSAR relative deformation measurements, we found maximum subsidence of about 3 to 10 cm during the thawing season with generally high spatial variability. Sentinel-1 time-series of interferograms with 6–12 day time intervals highlight that subsidence is often occurring rather quickly within roughly one month in early summer. Intercomparison of summer subsidence from Sentinel-1 in 2017 with TerraSAR-X in 2013 over part of the Lena River Delta (Russia) shows a high spatial agreement between both SAR systems. A comparison with in-situ measurements for the summer of 2014 over the Lena River Delta indicates a pronounced downward movement of several centimetres in both cases but does not reveal a spatial correspondence between InSAR and local in-situ measurements. For the reconstruction of longer time-series of deformation, yearly Sentinel-1 interferograms from the end of the summer were considered. However, in order to infer an effective subsidence of the surface through melting of excess ice layers over multi-annual scales with Sentinel-1, a longer observation time period is necessary.
    Materialart: Online-Ressource
    ISSN: 2072-4292
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2018
    ZDB Id: 2513863-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
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    IOP Publishing ; 2019
    In:  IOP Conference Series: Materials Science and Engineering Vol. 603, No. 5 ( 2019-09-01), p. 052074-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 603, No. 5 ( 2019-09-01), p. 052074-
    Kurzfassung: Within increasing competition between cities for human resources a problem to enhance attractiveness of urban life is coming to the fore. While planning and designing urban environment major focus is given to the needs and interests of different population groups. Hence, a city should become a place of attracting creative people, individuals and groups which possess special knowledge and skills necessary for promoting, developing and improving an area that could become appealing to business, investors, tourists, etc.. With this purpose much attention should be paid to student-age youth as a potential driver of the area development by transforming a place of residence into an attractive urban environment. The purpose of this study is to analyze how student-age young people of Yekaterinburg perceive and assess attractiveness of the city as a place to live. Yekaterinburg is the biggest Russian industrial city that claims to be the “third” capital (after Moscow and Saint Petersburg). In 2017 we worked out an author’s questionnaire containing 10 questions and conducted a standardized sociological poll of students of Yekaterinburg. 71 men and 129 women aged 18-25 of different academic fields participated in the survey. 42% of poll participants are local residents of Yekaterinburg (they were born in it and live here on a permanent basis), 58% came here from other places (80% of respondents moved to Yekaterinburg to study in higher educational establishments). Research findings showed that Yekaterinburg as a place to live is attractive for students due to a wide range of malls and shops, extended cultural and leisure facilities, opportunities for higher education and self-actualization. Meanwhile, the students pointed out some problem zones of the city like ecological situation, pavement condition, pollution, corruption and impossibility to take part in solving city problems. The young people consider park areas, transport accessibility (subway availability), extended network of cultural and recreational centers to be major attractive factors of urban life. General results of the poll and students’ assessments indicate that a city as a place to live has two facets: a “comfortable” city with parks and gardens, cultural and leisure facilities, conditions for creative self-fulfillment and innovation and an “instrumental” city as a place for career development and material welfare.
    Materialart: Online-Ressource
    ISSN: 1757-8981 , 1757-899X
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2019
    ZDB Id: 2506501-4
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    In: Nature Communications, Springer Science and Business Media LLC, Vol. 14, No. 1 ( 2023-03-28)
    Kurzfassung: Industrial contaminants accumulated in Arctic permafrost regions have been largely neglected in existing climate impact analyses. Here we identify about 4500 industrial sites where potentially hazardous substances are actively handled or stored in the permafrost-dominated regions of the Arctic. Furthermore, we estimate that between 13,000 and 20,000 contaminated sites are related to these industrial sites. Ongoing climate warming will increase the risk of contamination and mobilization of toxic substances since about 1100 industrial sites and 3500 to 5200 contaminated sites located in regions of stable permafrost will start to thaw before the end of this century. This poses a serious environmental threat, which is exacerbated by climate change in the near future. To avoid future environmental hazards, reliable long-term planning strategies for industrial and contaminated sites are needed that take into account the impacts of cimate change.
    Materialart: Online-Ressource
    ISSN: 2041-1723
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2023
    ZDB Id: 2553671-0
    Standort Signatur Einschränkungen Verfügbarkeit
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