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    Tytuł:
    Analysis of the average fire gas temperature in a mine drift with multiple fires
    Autorzy:
    Hansen, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/91997.pdf
    Data publikacji:
    2018
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    multiple fires
    mine drifts
    average fire gas temperature
    pożary wielokrotne
    chodniki kopalniane
    średnia temperatura gazu pożarowego
    Opis:
    The average fire gas temperature of multiple fires in a mine drift with longitudinal ventilation is investigated. The output of a quasi-steady model is investigated and compared with experimental results from model scale fire experiments. During the analysis it was found that the calculated average fire gas temperature of the model correlates quite well with the measured temperature, except for the period when the fire closest to the measuring point reached a peak of heat release rate. This poor correlation is likely due to flame impingement as the distance to the nearest fire decreases. Uncertainty of the calculations is caused by the fire gas temperature at the site of each individual fire and further studies into the fire growth rate and maximum heat release rates of multiple fires are recommended in order to remedy this uncertainty. When calculating the average fire gas temperature, a key parameter is determined with respect to the smoke spread in a mine drift as well as the risk of fire spread.
    Źródło:
    Journal of Sustainable Mining; 2018, 17, 4; 226-238
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure in big skew - Gladsaxe case Denmark
    Autorzy:
    Tomala, P.
    Vegerby-Hansen, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/383598.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    buried steel structures
    underpass
    big skew
    Opis:
    This paper presents how to solve the end treatment for buried steel structure designed initially in an incorrect way. Structure VR9 with span of 4.77m and rise of 3.83m was designed with skew of 28 degree with beveled end cut 1:1.5. Due to heavy loads LM1 LL vehicle the cut end would be subjected to huge deformations. The solution of the problem required the designing of: geogrids to reduce the horizontal active pressure and the 3D concrete frame to carry the vertical loads (soil and traffic). Fem 3D analysis and final solution of cut end reinforcement will be presented in this paper.
    Źródło:
    Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 279-286
    1897-4007
    Pojawia się w:
    Archiwum Instytutu Inżynierii Lądowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steady and unsteady analysis of NACA 0018 airfoil in vertical-axis wind turbine
    Autorzy:
    Rogowski, K.
    Hansen, M. O. L.
    Maroński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/279244.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    airfoil characteristics
    vertical-axis wind turbine
    computational fluid dynamics
    Opis:
    Numerical results are presented for aerodynamic unsteady and steady airfoil characteristics of the NACA 0018 airfoil of a two-dimensional vertical-axis wind turbine. A geometrical model of the Darrieus-type wind turbine and the rotor operating parameters used for numerical simulation are taken from the literature. Airfoil characteristics are investigated using the same mesh distribution around the airfoil edges and two turbulence models: the RNG k-ε and the SST Transition. Computed results for the SST Transition model are in good agreement with the experiment, especially for static airfoil characteristics.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 203-212
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Offshore Fleet Workers and the Circadian Adaptation of Core Body Temperature, Blood Pressure and Heart Rate to 12-h Shifts: A Field Study
    Autorzy:
    Hansen, J. H.
    Geving, I. H.
    Reinertsen, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/91164.pdf
    Data publikacji:
    2010
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    offshore fleet
    circadian rhythms
    blood pressure
    heart rate
    core temperature
    Opis:
    Objectives. The aim of this study was to investigate the circadian adaptation of tcr (core body temperature), BP (blood pressure), HR (heart rate) and subjective sleep quality after 7 days of working 12-h night shifts in offshore fleet workers. Methods. Night workers (N = 7) (18:00–6:00) and day workers (N = 7) (6:00–18:00) were recruited from a Norwegian offshore company operating in the North Sea. We measured tcr, BP and HR on days 1 and 7. Results. An increase of 0.6 oC (p = .03) was observed within the group of night workers from day 1 to day 7. Between the night and day workers there was a significant difference of 0.6 oC from day 1 to day 7 (p = .01). Sleep latency and sleep length also showed significant differences between the groups (p = .01 and p = .04). There was an interaction effect in tiredness during the shift (p = .02). Conclusion. The significant increase in tcr indicates an adaptation in the night workers to the new working schedule, and the extended working hours and sleep deprivation are hypothesized to be the main cause of the increased tcr. Light exposure, altered pattern of food availability and physical activity are likely to have contributed as well. Subjective sleep quality showed inconclusive results.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 487-496
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Powiedzieć zaufanemu dorosłemu – czynniki związane z prawdopodobieństwem ujawnienia przez dziecko doświadczeń wykorzystywania seksualnego przed lub w trakcie formalnego przesłuchania
    Telling a Trusted Adult: Factors associated with The Likelihood of Disclosing Child Sexual Abuse Prior to And During a Forensic Interview
    Autorzy:
    Grandgenetta, Hanna M.
    Pittengerb, Samantha L.
    Dworkin, Emily R.
    Hansen, David J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201203.pdf
    Data publikacji:
    2021
    Wydawca:
    Fundacja Dajemy Dzieciom Siłę
    Tematy:
    wykorzystywanie seksualne
    ujawnienie
    przesłuchanie
    odkrycie
    wykorzystywania
    wiara opiekuna
    model równań strukturalnych
    sexual abuse
    disclosure
    forensic interview
    abuse discovery
    caregiver belief
    structural equation
    model
    Opis:
    Celem artykułu jest analiza praktyki stosowania zasady jednokrotnego przesłuchania wyrażonej w art. 185a Kodeksu postępowania karnego, która gwarantuje małoletniemu pokrzywdzonemu ochronę przed negatywnymi skutkami udziału w czynności. Badanie przeprowadzono w marcu i kwietniu 2020 r. metodą indywidualnego wywiadu telefonicznego wśród 19 sędziów z wydziałów karnych sądów rejonowych i okręgowych oraz 12 biegłych psychologów. Do powtórnych przesłuchań dochodzi, gdy zawnioskuje o to oskarżony, który nie miał obrońcy w czasie pierwszego przesłuchania, lub gdy wyjdą na jaw nowe istotne okoliczności, których wyjaśnienie wymaga ponownego przesłuchania. Według respondentów do takiej sytuacji często dochodzi w wyniku przesłuchania małoletniego w fazie in rem postępowania przygotowawczego. Badani są przeciwni powtórnemu przesłuchiwaniu małoletnich świadków przestępstw. Aby uniknąć konieczności powtarzania czynności, sędziowie stosują różne strategie, chociaż nie zawsze są przekonani, czy są one efektywne i zapewnią małoletnim pokrzywdzonym ochronę również na kolejnych etapach postępowania karnego.
    The aim of the article is to analyse the practice of applying the principle of single interview, expressed in The Article 185 of the Code of Criminal Procedure, which guarantees protection of a child witness of a crime against the negative effects of participation in the proceeding. The study was conducted using the method of individual telephone interview in March and April 2020 among 19 judges from the criminal departments of district and regional courts and 12 expert witnesses. Repeated interviewing takes place when the accused, who did not have a defense attorney during the first interview, requests it or when new, previously unknown circumstances come to light. According to the respondents, such a situation often takes place as a result of the minor being interviewed at the preparatory stage of the proceedings. The respondents are against repeated interviewing of child witnesses. To avoid repetition, judges use different strategies, although they are not always convinced that the strategies are effective and will ensure protection for child witness also at subsequent stages of criminal proceedings.
    Źródło:
    Dziecko krzywdzone. Teoria, badania, praktyka; 2021, 20, 1: Wymiar sprawiedliwości wobec dzieci; 88-112
    1644-6526
    Pojawia się w:
    Dziecko krzywdzone. Teoria, badania, praktyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Healed or non-healed? Computed tomography (CT) visualisation of morphology of bite trace ichnotaxa on a dinosaur bone
    Autorzy:
    Jacobsen, A. R.
    Lauridsen, H.
    Fiirgaard, B.
    Boel, L. W. T.
    Hansen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191178.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Bite traces
    dinosaur bone
    theropod
    CT
    computed tomography
    stereomicroscopy
    Opis:
    Bite traces on fossilised bones can provide important information on predator-prey relations and interactions in ancient environments. In 2009, two new ichnotaxa, Linichnus serratus and Knethichnus parallelum, were introduced to develop the application of bite traces as an ichnological tool. Ichnotaxa defined by theropod bite traces can provide useful information for understanding feeding behaviour. However, objective interpretation of possible bite traces can be difficult using traditional visual inspection. In this study, the bite traces on a fossilised dinosaur bone were comprehensively examined by correlating traditional naked-eye in spection with computed tomography (CT) imaging, used to visualise the internal morphology of the bite traces and in particular, to clarify the appearance of one possibly healed bite trace. A forensic pathologist visually examined the bone with the aid of stereomicroscopy and a radiologist analysed the CT scans. Sixteen different scanner settings were used to optimise the CT parameters and avoid signal at tenuation, in the form of hypointense artefacts in the central trabeculated part of the bone fragment. The use of CT scanning provided information on internal morphology from the vicinity of the bite trace, including hyperdense zones, not identified using visual inspection alone. By applying the extended CT scale, the dense and radiopaque cortical bone layer could be clearly identified and applied as a pathomorphological marker to correctly distinguish non-healed from healed wounds. In conclusion, the authors demonstrate that external visual examination of trace fossils by ichnologists in combination with interior examination using CT imaging can be applied to characterise ichnotaxa defined by bite traces and potentially provide clues on ancient feeding behaviour.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 3; 457-464
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and hydraulically-induced recycling of phosphorus in the North Sea-Baltic Sea transition zone
    Autorzy:
    Kepp, R.R.
    Struve, A.
    Christiansen, C.
    Lund-Hansen, L.C.
    Nielsen, M.H.
    Vang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47459.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Little Belt
    transport
    transition zone
    Baltic Sea
    recycling
    phosphorus
    water transport
    hydraulic mixing
    North Sea
    water chemistry
    water column
    Opis:
    Bottom-mounted acoustic Doppler current profiler measurements indicate that the net transport of water (844 m3 s−1) in the Little Belt makes up only 6% of the total transport between the Baltic Sea and the North Sea. This is a smaller percentage than the 9% commonly found in the literature. Owing to barotropic and tidal currents the gross transport is 5 times larger. The net transport is directed towards the North Sea mainly in the top 32 m of the water column but towards the Baltic Sea it occurs in the lower 5 m of the water column. The resulting transport of phosphorus is strongly affected by vertical mixing in an area of hydraulic control in the narrow part of the Little Belt. Comparisons of phosphorus profiles in stratified waters and in the mixing area indicate a yearly entrainment of 15 tonnes P from the bottom water to the surface layer. This vertical transport of P forms part of an internal loop in the general transport between the Baltic Sea and the North Sea. Compared to the transport observed 15–16 years ago, the present net phosphorus transport of 163 tonnes yr−1 from the Baltic Sea through the Little Belt is substantially lower.
    Źródło:
    Oceanologia; 2006, 48, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Sitting of Platinum Atoms in Diluted SiGe Alloys
    Autorzy:
    Dobaczewski, L.
    Bonde Nielsen, K.
    Nylandsted Larsen, A.
    Lundsgaard Hansen, J.
    Gościński, K.
    Peaker, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969056.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    71.55.Cn
    73.40.Lq
    Opis:
    In this report we present high-resolution spectra obtained with a use of the Laplace transform deep level transient spectroscopy for platinum diffused into dilute (0-5% of Ge) SiGe alloys. Very significant changes are observed in the spectra associated with the transition metals as the germanium content is altered. We interpret these spectra in terms of the configurations of silicon and germanium atoms surrounding the transition metal. In order to explain the observed behaviour both the first and second nearest neighbour shells are considered.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 297-299
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warm waters of summer 2002 in the deep Baltic Proper
    Autorzy:
    Feistel, R.
    Nausch, G.
    Mohrholz, V.
    Lysiak-Pastuszak, E.
    Seifert, T.
    Matthaus, W.
    Kruger, S.
    Hansen, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/47540.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    temperature
    hydrography
    inflow
    warm water
    summer
    salinity
    Baltic Sea
    oxygen condition
    Opis:
    From October 2002 until March 2003 surprisingly warm, oxygenated waters were frequently encountered in the Baltic Sea in the area between the Bornholm and Fårö Deeps from the halocline down to the bottom. Owing to their ventilation effect in the stagnating deep waters, their occasional observations have partly been incorrectly attributed to the inflow events of October 2002 or January 2003. The emergence of some of these waters can be traced back to the exceptional summer weather conditions in August and September 2002 in central Europe. The warm waters played a remarkable renewal pacemaker role for the subsequent important winter inflow of January 2003. The evolution of this summer inflow is described and possible causes are discussed.
    Źródło:
    Oceanologia; 2003, 45, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction
    Autorzy:
    Dahlborg, U.
    Cornide, J.
    Calvo-Dahlborg, M.
    Hansen, T.
    Leong, Z.
    Asensio Dominguez, L.
    Chambreland, S.
    Cunliffe, A.
    Goodall, R.
    Todd, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402077.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.fm
    61.66.Dk
    Opis:
    The understanding of the structure and the stability of high entropy alloys is still incomplete and the mechanisms behind the composition-property relationships are unclear. One reason is that few systematic and accurate determinations of their composition-dependent structure on atomic level have been made. In this paper some results on the structure obtained by X-ray and neutron diffraction of the CoCrFeNi alloy, to which Pd, Sn and Cu have been added in different amounts, are reported. The investigations make it obvious that none of the alloys is completely homogeneous, as has earlier been suggested, and that they do not form a perfect solid solution.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 552-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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