Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "head model" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-10 z 10
    Tytuł:
    Finite element head model for the crew injury assessment in a light armoured vehicle
    Autorzy:
    Burkacki, Michał
    Wolański, Wojciech
    Suchoń, Sławomir
    Joszko, Kamil
    Gzik-Zroska, Bożena
    Sybilski, Kamil
    Gzik, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/27324139.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    head model
    HIC
    head injury
    safety assessment
    model głowy
    uraz głowy
    ocena bezpieczeństwa
    Opis:
    Purpose: The aim of this paper was the development of a finite element model of the soldier’s head to assess injuries suffered by soldiers during blast under a light armoured vehicle. Methods: The application of a multibody wheeled armoured vehicle model, including the crew and their equipment, aenabled the researchers to analyse the most dangerous scenarios of the head injury. These scenarios have been selected for a detailed analysis using the finite element head model which allowed for the examination of dynamic effects on individual head structures. In this paper, the authors described stages of the development of the anatomical finite element head model. Results: The results of the simulations made it possible to assess parameters determining the head injury of the soldier during the IED explosion. The developed model allows the determination of the parameters of stress, strain and pressure acting on the structures of the human head. Conclusion: In future studies, the model will be used to carry out simulations which will improve the construction of the headgear in order to minimize the possibility of the head injury.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 173--183
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electroimpedance tomography as a tool for brain examination
    Autorzy:
    Gorajek, T.
    Nowakowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954508.pdf
    Data publikacji:
    1999
    Wydawca:
    Politechnika Gdańska
    Tematy:
    electroimpedance tomography
    EIT
    impedance modelling
    EEG propagation analysis
    head model
    Opis:
    Discusses the possibility of a successful electroimpedance tomography (EIT) reconstruction of the impedance distribution within the human head, taking into consideration the presence of the skull and its screening effect on electrical signals. The results of numerous computer simulations of the processes of impedance measurement and 3D EIT reconstruction are presented. The volume of the smallest recognisable perturbation within both the brain and the skull areas are determined, as well as their relationships with the required contrast. The unquestionable usefulness of the EIT approach for the purpose of impedance modelling is proven.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 4; 445-451
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the distribution of SAR and temperature in human brain during radio-frequency cosmetic treatment
    Autorzy:
    Qi, Xinzhe
    Lu, Mai
    Powiązania:
    https://bibliotekanauki.pl/articles/1841322.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromagnetic exposure
    human head model
    ICNIRP guidelines
    radiofrequency cosmetic instruments
    safety assessment
    ekspozycja elektromagnetyczna
    model ludzkiej głowy
    wytyczne ICNIRP
    ocena bezpieczeństwa
    Opis:
    This paper established a radio-frequency electrode model and human head modelused in RF cosmetic instruments. The distribution of electric field strength, a specific absorption rate (SAR), and temperature distribution in the human brain at 1 MHz and 6 MHz were studied and the results compared with the International Commission on Non-ionizing Radiation Protection (ICNIRP) guidelines. The results showed that under those two frequencies the maximum value of electric field strength in the human brain was 1.52 V/mand it was about 5.4% of the ICNIRP basic restrictions, the maximum SAR in human brain was about 2.21×10−3W/kg, which was far less than 2 W/kg of ICNIRP basic restrictions, the maximum temperature of the human brain was 37.6 located in the wounded skin, which was the same as the normal temperature 37. Since all the results were within the ICNIRP basic restrictions, the electromagnetic exposure generated by the RF cosmetic electrode will not pose a threat to the human health.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 115-127
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulated depiction of head and brain injuries in the context of cellularbased materials in passive safety devices
    Autorzy:
    Wilhelm, J.
    Ptak, M.
    Rusiński, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/135603.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    passive safety
    Cork
    EPS
    energy absorption
    injury criteria
    injury mechanism
    FE Head Brain Model
    dynamic simulation
    Opis:
    The performance of passive safety devices to protect vulnerable road users, or otherwise endangered persons, from severe injuries in cases of impacts and accidents has improved notably in recent decades. The devices’ levels of performance appear to have plateaued but the numbers of severe injuries and deaths caused in such incidents could be decreased further if new solutions are found. At first, the possibilities for improving the impact behavior of passive safety devices may appear to be restricted to device geometry; however, it is in fact also possible to rethink the applied materials and to utilize natural principles in their design. In this study, impact related brain injury mechanisms and injury criteria are investigated using dynamic simulations and Finite Element Head Models, results from which are compared with data collected from real-life accidents. As these tools are advancing considerably in terms of accuracy, information density and complexity, they provide, like expert knowledge from the fields of biomechanics, biomedicine and neuroscience, valuable input for further development.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 50 (122); 98-104
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using 1D and 2D computer models when predicting hydrodynamic and morphological parameters of a boulder block ramp: Poniczanka stream, Carpathians
    Autorzy:
    Plesiński, Karol K.
    Radecki-Pawlik, Artur
    Rivera-Trejo, Fabian
    Powiązania:
    https://bibliotekanauki.pl/articles/2203562.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    boulder blocks ramps
    low head hydraulic structures
    field measurement
    hydraulics
    riverbed morphology
    HEC-RAS model
    CCHE2D model
    Opis:
    When modelling flow and/or sediment transport in streams and rivers, one must frequently use the computer software of differing levels of complexity. The level of sophistication, accuracy, and quality of results are the parameters by which models can be classified as being 1D, 2D, or 3D; it seems certain that in the future, there will also be 4D and 5D models. However, the results obtained from very sophisticated models are frequently questionable, and designers in the field of hydraulic structures must have considerable experience distinguishing important information from irrelevant information. Thus, this paper aims to investigate the effect of the selected boulder block ramp hydraulic structure at Poniczanka stream on the bed-load transport. We evaluated sediment transport using the CCHE2D numerical model. We analysed several scenarios depending on the river bed type (erodible, non-erodible, rocky) and examined the rock blocks used for hydraulic structure construction. The obtained results were compared with the Hjulström and the Shields graph, which are a classic approach for identifying fluvial processes in river channels. In addition to these two methods, numerical modelling using the 1D HEC-RAS (Hydrologic Engineering Center’s River Analysis System) modelling were conducted, which included the determination of horizontal and vertical changes to the river bed morphology of the examined section of river reach as well as providing the basic hydrodynamics parameters which, from the practical point of view, designers involved in the process of designing ramps could use.
    Źródło:
    Journal of Water and Land Development; 2022, Special Issue; 34--48
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the finite element model on the inverse determination of the heat transfer coefficient distribution over the hot plate cooled by the laminar water jets
    Wpływ modelu metody elementów skończonych na współczynnika wymiany ciepła wyznaczany z rozwiązania odwrotnego procesu laminarnego chłodzenia płyty metalowej
    Autorzy:
    Hadała, B.
    Malinowski, Z.
    Telejko, T.
    Szajding, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/350884.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    współczynnik przenikania ciepła
    metoda elementów skończonych
    head transfer coefficient
    finite element model
    inverse solution
    Opis:
    The industrial hot rolling mills are equipped with systems for controlled cooling of hot steel products. In the case of strip rolling mills the main cooling system is situated at run-out table to ensure the required strip temperature before coiling. One of the most important system is laminar jets cooling. In this system water is falling down on the upper strip surface. The proper cooling rate affects the final mechanical properties of steel which strongly dependent on microstructure evolution processes. Numerical simulations can be used to determine the water flux which should be applied in order to control strip temperature. The heat transfer boundary condition in case of laminar jets cooling is defined by the heat transfer coefficient, cooling water temperature and strip surface temperature. Due to the complex nature of the cooling process the existing heat transfer models are not accurate enough. The heat transfer coefficient cannot be measured directly and the boundary inverse heat conduction problem should be formulated in order to determine the heat transfer coefficient as a function of cooling parameters and strip surface temperature. In inverse algorithm various heat conduction models and boundary condition models can be implemented. In the present study two three dimensional finite element models based on linear and non-linear shape functions have been tested in the inverse algorithm. Further, two heat transfer boundary condition models have been employed in order to determine the heat transfer coefficient distribution at the hot plate cooled by laminar jets. In the first model heat transfer coefficient distribution over the cooled surface has been approximated by the witch of Agnesi type function with the expansion in time of the approximation parameters. In the second model heat transfer coefficient distribution over the cooled plate surface has been approximated by the surface elements serendipity family with parabolic shape functions. The heat transfer coefficient values at surface element nodes have been expanded in time by the cubic-spline functions. The numerical tests have shown that in the case of heat conduction model based on linear shape functions inverse solution differs significantly from the searched boundary condition. The dedicated finite element heat conduction model based on non-linear shape functions has been developed to ensure inverse determination of heat transfer coefficient distribution over the cooled surface in the time of cooling. The heat transfer coefficient model based on surface elements serendipity family is not limited to a particular form of the heat flux distribution. The solution has been achieved for measured temperatures of the steel plate cooled by 9 laminar jets.
    Nowoczesne linie walcowania blach na gorąco posiadają instalacje do wymuszonego chłodzenia. Jego celem jest kontrolowanie szybkości zmian temperatury blachy w całej objętości zapewniając tym wymaganą strukturę i własności mechaniczne. Chłodzenie jest prowadzone w końcowej części linii technologicznej, w której nad górną i pod dolną powierzchnią gorącego pasma umieszczone są urządzenia dostarczające wodę chłodzącą. Z uwagi na sposób podawania wody chłodzącej można je podzielić na trzy główne systemy: chłodzenie laminarne, chłodzenie z użyciem kurtyn wodnych oraz chłodzenie natryskiem wodnym. W istniejących liniach walcowniczych można spotkać kombinacje poszczególnych systemów. Projektowanie systemów chłodniczych jest trudne i musi być wspomagane przez modele matematyczne i numeryczne wymiany ciepła między gorącą powierzchnią blachy a wodą i otoczeniem. Podstawowe znaczenie dla symulacji procesu ma przyjęcie poprawnych wartości współczynników wymiany ciepła, których znajomość w dużej mierze determinuje dokładność obliczeń. Współczynnik wymiany ciepła nie może być zmierzony bezpośrednio i konieczne jest zastosowanie rozwiązań odwrotnych zagadnienia przewodzenia ciepła. W algorytmach odwrotnych możliwe jest użycie różnych modeli do rozwiązania równania przewodzenia ciepła. Zastosowane modele w istotnym stopniu wpływają na jakość rozwiązania odwrotnego. W pracy przedstawiono wyniki testów dwóch modeli przewodzenia ciepła opartych na liniowych i nieliniowych funkcjach kształtu w algorytmie metody elementów skończonych. Testowano również dwa modele aproksymacji warunku brzegowego. Wybrany model warunku brzegowego i model metody elementów skończonych wykorzystujący nieliniowe funkcje kształtu zastosowano do wyznaczenia współczynnika wymiany ciepła w procesie chłodzenia gorącej płyty stalowej 9 strumieniami wody swobodnie opadającej na jej powierzchnie. Uzyskano rozwiązanie przedstawiajace rozkład współczynnika wymiany ciepła i gęstości strumienia ciepła na powierzchni płyty w czasie jej chodzenia.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 105-112
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of election of the head of state of the Third Polish Republic – balancing between institutional coherence and political pragmatism
    Autorzy:
    Glajcar, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/514616.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Śląski. Wydział Nauk Społecznych
    Tematy:
    model of election of the head of state
    the position of the president
    Third Polish Republic
    Opis:
    Poland held its first ever popular presidential election at the end of 1990. Since then four such elections have been held i.e. in 1995, 2000, 2005 and 2010. In the meantime the position of the president gradually evolved hence giving rise to the question about which method for the election of the head of state is most “appropriate”. However, this issue was not an object of political deliberation for the major Polish political parties of the last 20 years. Firstly, this resulted from the popularity of the presidential election within society, which was reflected in high turnouts (considering Polish reality). Secondly, especially until the enactment of the Constitution of the Republic of Poland of 2 April 1997, no party wanted to run the risk of being accused of returning to the political transition solutions adopted at the Round Table. Thirdly, until the beginning of 2010, the competition for the office of president was “reserved” for charismatic leaders or party leaders. It was finally Donald Tusk, who decided not to contend for the presidential election of 2010 thus wanting to change the perception of the institution of president in the system of power and draw attention and emphasize the role and the importance of a government with a strong (normatively and factually) prime minister as the leader.
    Źródło:
    Political Preferences; 2013, 4; 39-51
    2449-9064
    Pojawia się w:
    Political Preferences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three- and four-mass models for vehicle front crumple zone
    Autorzy:
    Lukoševičius, Vaidas
    Keršys, Robertas
    Keršys, Artūras
    Makaras, Rolandas
    Jablonskytė, Janina
    Powiązania:
    https://bibliotekanauki.pl/articles/1841200.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    crumple zone
    lumped mass model
    head performance criterion
    neck injury criteria
    strefa zgniotu
    model masy bryłowej
    kryterium wpływu zderzenia na głowę
    kryteria urazu szyi
    Opis:
    The article deals with the applicability of the three- and four-mass crumplezone models by optimization of the vehicle front crumple zone in case of a collision. The possibilities for integrating the requirements for individual crumple zones are discussed. The crumple model for special crumple zone elements has been proposed. Optimum parameter limits for the deformable elements have been identified, and complex influence of the damping elements used has been demonstrated. The need for adjustment of the optimization process for different vehicle load has been identified. The article analyzes the requirements applicable to the front crumple zone of a light passenger vehicle in case of a front collision by employing simple models.
    Źródło:
    Transport Problems; 2020, 15, 3; 79-92
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical Modelling of Muscle Effect on the Kinematics of the Head-Neck Complex in a Frontal Car Collision: A Parameter Study
    Autorzy:
    Wittek, A.
    Kajzer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/91087.pdf
    Data publikacji:
    1998
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    head-neck complex kinematics
    muscle effect
    Hill-type muscle model
    mathematical modeling
    mięśnie szyi
    modelowanie matematyczne
    zderzenie czołowe samochodu
    Opis:
    A 2-dimensional multibody model of the head-neck complex with muscle elements was developed to estimate the influence of muscles on the kinematics of the head-neck complex in a frontal car collision. With this model the authors evaluated how strongly the calculated influence of muscles depends on 3 important factors: (a) impact severity, (b) reflex time, and (c) parameters that determine characteristics of different components of the muscle model. When muscles were triggered at the beginning of impact, the maximum angle of the head flexion was decreased by the muscles by 40% in a frontal collision with an acceleration of 15 g. The influence of muscles was significant for reflex times lower than 60 (80) ms. The calculated influence of muscles was not sensitive to most parameters of the muscle model.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 201-220
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polar head charge of membrane modifiers and their biological activity: the Monte Carlo simulation studies
    Autorzy:
    Kubica, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953950.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Monte Carlo simulations
    membrane modifiers
    phospholipids
    Pink model
    membrane
    membrane simulations
    gel fluid transition
    polar head charge
    biological activity
    Opis:
    On the basis of the 10-state Pink model, the effect of the polar head charge of amphiphilic modifier molecules has been discussed. It was shown, that for small concentrations of anionic and cationic compounds inserted into a layer composed of electroneutral lipids the electrostatic interaction, in spite of the long-range character, can be limited to the nearest neighbour interaction. Computer simulation results suggest, that the gel-fluid transition temperature can be lowered or raised by a proper selection of anionic-cationic amphiphilic modifiers. Moreover, the effect of ionic strength of the membrane medium and dielectric permeability of the hydrophobic part of membrane, where a shift of the dielectric constant from 5 to 80 occurred, has been studied. It was also shown that addition of alkyl molecules to the membrane, which are the counterions of alkyl modifier molecules added earlier, almost doubles the number of incorporated membrane modifiers. Membrane permeability analysis shows that membrane permeability, at temperatures lower than the gel-fluid transition temperature, should be more related to the number of small domains (cluster area) and less to the interfacial area.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 4; 601-609
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies