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 "mass loss" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-14 z 14
    Tytuł:
    The ice mass loss in the front zone of the Werenskiold Glacier from 1957 to 1978 determined using terrestrial photogrammetry
    Autorzy:
    Janina, Jacek
    Lipert, Cezary
    Mechliński, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2057383.pdf
    Data publikacji:
    1984
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Spitsbergen
    photogrammetry
    glaciology
    mass loss
    Źródło:
    Polish Polar Research; 1984, 5, 3-4; 207-216
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of mass changes of flying objects on their dynamic features
    Autorzy:
    Wiśniewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246227.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    air transport
    dynamics features
    resonance researches
    mass loss
    Opis:
    The aim of this work is the experimental study of the weight loss impact on the properties of flying objects. Work is hased on the results of resonance tests of the helicopter, gliders and military aircraft. In the presented flying objeets group the possible occurrence of weight losses during the flight are up to 50%. The paper posed the following questions: How big can be, in practice, the weight loss during the flight? To which resonance the mass loss has the greatest impact? How and by what rules the map of resonances changes? Does in the process of weight loss there are other, worth-knowing events? Gliders, airplanes and a helicopter were investigated in the Resonance Test Laboratory of Institute of Aviation. The author has organized and for over 20 years led the Resonance Test Laboratory at the Institute of Aviation, in which he made or directed the investigations of dozens of aircraft, gliders, helicopters and their elements and components. Effect of weight loss on the flying objeets properties is one of several ,,unusual" research topics phenomena, which the author observed during a standard resonance tests. The resonance of the mode shape of Jantar 15 glider, comparison of the relative increase in the frequencies of the resonances with mode shape for SZD-50 Jantar 15-2 and IS-2 Revelation gliders, results of investigations of the underwing stores loss of mass impact on the „Pattem" aircraft resonances freąuencies, the resonance frequency of the 1-22 Iryda aircraft are presented in the paper. The resonance of the mode shape of Jantar 15 glider, comparison of the relative increase in the frequencies of the resonances with mode shape for SZD-50 Jantar 15-2 and IS-2 Revelation gliders, results of investigations of the underwing stores loss of mass impact on the ,,Pattern" aircraft resonances frequencies, the resonance frequency of the 1-22 Iryda aircraft are presented in the paper.
    Źródło:
    Journal of KONES; 2010, 17, 4; 591-598
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the Blood Pressure, Heart Rate and Body Mass of Physically Active Men in Response to Thermal Stress
    Autorzy:
    Podstawski, Robert
    Bielec, Grzegorz
    Borysławski, Krzysztof
    Alföldi, Zoltán
    Marzec, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2026889.pdf
    Data publikacji:
    2022-03-31
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    dry sauna
    blood pressure
    heart rate
    body mass loss
    physical activity
    Opis:
    Background: Finnish sauna is presently the most popular type of thermal therapy in Europe. Saunas are widely available in aquaparks, SPA centers and hotels. In Scandinavian countries sauna is regarded not only as a form of treatment, but as a part of the national lifestyle. Objective: The aim of this study was to evaluate sauna-induced changes in systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR) and body mass in healthy men. Methods: Thirty healthy men aged 20-49 years (mean age: 31.2±11.3 years) attended four 12-minute Finnish sauna sessions (temperature: 90°C, humidity: 14-16%) with 6-minute breaks in between sessions, including cold water immersion for 1 minute. The participants’ physical activity (PA) levels were evaluated with an IPAQ questionnaire. Sauna bathers’ body composition, BP and HR were measured before the first and after the fourth sauna session. Results: A significant (p < .001) decrease in SBP and DBP values was noted in response to sauna regardless of the bathers’ body mass, age and PA levels. The average HR increased significantly in younger, slimmer and more physically active participants. Sauna treatment induced a significant decrease in body mass loss regardless of all independent variables. Conclusions: Repeated 12-minute Finnish sauna sessions have a beneficial influence on the cardiovascular system. Finnish sauna can be recommended for healthy men with average and high PA levels as a means of decreasing BP. Body mass loss, on the other hand, is related to the loss of body fluids as a result of sweating.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2022, 37; 65-76
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The human bodys response to the conditions in the sauna
    Autorzy:
    Borysławski, Krzysztof
    Szaliłow, Karolina
    Bielec, Grzegorz
    Omelan, Aneta
    Podstawski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/1933106.pdf
    Data publikacji:
    2021-07-14
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    thermal stress
    blood pressure
    heart rate
    body mass loss
    participants from different age groups
    Opis:
    Aim: The aim of this study was to determine the effect of a 15-minute bathing session in a Finnish sauna on changes in systolic and diastolic blood pressure (SBP and DBP, respectively), heart rate (HR), and body mass. The effects of grouping variables (age, sex, BMI, frequency of sauna use, history of sauna use) were taken into account in the analysis. Materials and Methods: A total of 60 women (33.6±13.1) and 42 men (33.8±12.5) aged 17 to 79 participated in one 15-minute sauna session (temperature: 90-91°C; relative humidity: 14-16%) in December 2019, in the city of Wrocław, Poland. The participants' body mass, SBP, DBP and HR were measured before and after sauna. Body height was measured only before sauna. Results: Sauna induced significant changes in the participants' physiological parameters. Systolic blood pressure decreased (p<0.05) in both sexes, in older participants (p<0.001) regardless of their BMI, and in participants who had rarely used sauna and had used sauna for a minimum of several years. A significant decrease in DBP (p<0.001) and HR values and a significant loss of body fluids (p<0.001) was noted in both sexes regardless of age, BMI, frequency and history of sauna use. Conclusions: A 15-minute sauna session has a beneficial effect on the circulatory system and can be incorporated into cardiovascular therapies. Regular sauna use is an important factor, and optimal results can be achieved by visiting sauna several times a week.
    Źródło:
    Physical Activity Review; 2021, 2, 9; 11-17
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Above and Below-Ground Decomposition of Leaf Litter in Leucaena leucocaephala Plantation of Federal University of Agriculture, Abeokuta (FUNAAB), Nigeria
    Autorzy:
    Oladoye, A. O.
    Oyebamiji, N. A.
    Ayoku, Y. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1077278.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Forest plantation
    Leucaena leucocaephala
    ground level
    leaf litter
    mass loss
    nutrient contents
    release pattern
    Opis:
    A decomposition study was carried out on the leaf litters of Leucaena leucocaephala to determine the rate of decomposition of its leaves with respect to its placement on above or below the ground levels in L. leucocaephala plantations of the Federal University of Agriculture, Abeokuta, Nigeria. In the study, leaf litter were randomly handpicked from the forest floor, of this, 40 g each were weighed into thirty (30) litter bags of 2 mm mesh size in which 15 were randomly placed on the forest floor (above-ground) and the remaining 15 were buried in the soil between 5-10 cm depth (below-ground). Data were analysed using descriptive statistical techniques such as percentage, while inferential statistics (simple linear regression) was used to determine relationships between various nutrient elements and days of decomposition (DOD). We noted that the percentage of mass loss of leaf litter increased with time in days after deposit and was higher (29.93%, 32.43 % and 33.25%, 41.65%) at 80 to 100 days of placement above- and below-ground, respectively. Moreover, the exchangeable basic cations and chemical compositions of litters were not consistent with respect to DOD. Regression analysis of nitrogen (N) and organic carbon (OC) showed that these elements significantly contributed to the high (86 %) overall decomposition of litter (p < 0.05, p < 0.01) below-ground level. It is, therefore, concluded that decomposition of leaf litters occur faster below ground than above ground within the forest plantation.
    Źródło:
    World News of Natural Sciences; 2019, 23; 211-220
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mathematical model for calculating contact mass loss resulting from bridge disintegration in vacuum
    Autorzy:
    Borkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/140398.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    łuk elektryczny
    ubytek masy styków
    styk elektryczny
    oprogramowanie
    łącznik elektryczny
    electrical arc
    contact mass loss
    contact bridge
    software
    Opis:
    The paper presents descriptions of bridge disintegration types and contact mass loss in the bridge stage. There is presented Matlab solvers to solve equation describing dynamic changes of temperature in the bridge region. The final result of program calculations is the mass loss and the volume of the metal of contacts which was lost during the bridge stage.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 4; 399-411
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of remaining zinc coating on old corrugated steel culverts under railway
    Autorzy:
    Hansing, L.
    Cederqvist, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/383930.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    remaining zinc coating
    flexible structures
    old corrugated steel culverts
    life time of zinc coating
    atmospheric corrosion
    mass loss
    thickness reduction
    Opis:
    In this paper the authors present measurements of the zinc coating thickness performed on old corrugated steel culverts under railway in Sweden. The measurements were performed in the summer of 2015. The object of the study is to have an indication on how hot dip galvanized corrugated steel culverts withstand real conditions. This information forms an important basis for the decision on possible life time expectancies for those structures.
    Źródło:
    Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 125-131
    1897-4007
    Pojawia się w:
    Archiwum Instytutu Inżynierii Lądowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Analysis of Selected Functional Characteristics of Temporary Restorative Materials Used in Conservative Dentistry
    Analiza wybranych cech użytkowych tymczasowych materiałów odtwórczych stosowanych w stomatologii zachowawczej
    Autorzy:
    Słomion, M.
    Matuszewski, M.
    Styp-Rekowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971340.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    biomaterials
    temporary dental filling materials
    changes of surface structure
    mass loss
    biomateriały
    tymczasowe wypełnienia stomatologiczne
    zmiany struktury powierzchni
    ubytek masy
    Opis:
    An important factor in endodontic therapy is forming a tooth seal as a temporary restoration, which prevents leakage of medicines into the oral cavity, infiltration of microorganisms, and contamination of the root canal system by fluids or food debris. Suitable physicochemical analysis and usability evaluation of restorative materials, i.e. microhardness, abrasion and compression resistance, surface structure, behaviour at different temperatures, the sealing of tooth margins, the ease of insertion and removal, allow one to choose the material that will be most favourable for medical treatment. The aim of the study is to determine, in vitro, changes of the surface structure that arise over time in commonly used preparations for temporary dental fillings. The results showed significant structural changes occurring over time, especially at a temperature of 37°C (inflammation to be), which, for a long-term use, may have a negative impact on the treatment.
    Istotnym czynnikiem w prowadzonej terapii endodontycznej jest utworzenie uszczelnienia zęba w postaci tymczasowego uzupełnienia, które zapobiega wyciekaniu leków do jamy ustnej, dostawaniu się drobnoustrojów oraz zanieczyszczaniu kanałów korzeniowych przez płyny czy resztki pokarmu. Przeprowadzenie odpowiedniej analizy fizykochemicznej, a także oceny użytkowej materiałów odtwórczych, tj. mikrotwardości, odporności na ściskanie i ścieranie, struktury powierzchni, zachowania w różnych temperaturach, szczelności brzeżnej, łatwości wprowadzania i usuwania, pozwala na dobór materiału, który będzie najkorzystniejszy dla prowadzonego leczenia. Celem badań było określenie zmian struktury powierzchni powstających w czasie pod wpływem oddziaływania środowiska oraz odporności na zużywania ścierne dla stosowanych preparatów do tymczasowych wypełnień stomatologicznych. Wyniki wykazały istotne zmiany struktury powstające w czasie, szczególnie w temperaturze 37°C (teoretycznie początek stanu zapalnego), co przy dłuższym stosowaniu może mieć negatywny wpływ na prowadzone leczenie.
    Źródło:
    Tribologia; 2018, 281, 5; 101-108
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role and Effectiveness of the MBP Installation in Poland Based on Selected Examples
    Autorzy:
    Wiśniewska, Marta
    Lelicińska-Serafin, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/396201.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    treatment of waste
    biological treatment
    mechanical treatment
    municipal waste
    mass loss
    przetwarzanie odpadów
    przetwarzanie biologiczne
    przetwarzanie mechaniczne
    odpady komunalne
    utrata masy
    Opis:
    The paper presents examples of installations for the mechanical and biological treatment of municipal waste in Poland. Each of the presented installations is defined as a regional municipal waste treatment installation (RIPOK). Their technological solutions and work efficiency have been compared in this study. In addition, the loss of waste mass as a result of processes occurring in the biological part of individual installations was calculated in the research. The paper refers to the National Waste Management Plan (KPGO 2022) regarding the circular economy. As intended by the circular economy, MBP installations will be transformed into installations that will treat selectively collected municipal waste and become Regional Recycling Centers (RCR).
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 2; 1-12
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of TATP: Mass Loss and Friction Sensitivity During Ageing
    Autorzy:
    Matyáš, R.
    Šelešovský, J.
    Musil, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358184.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    triacetone triperoxide
    TATP
    3,3,6,6,9,9-hexamethyl-1,2,4,5,7,8- hexoxonane
    friction sensitivity
    mass loss
    Opis:
    Triacetone triperoxide (3,3,6,6,9,9-hexamethyl-1,2,4,5,7,8-hexoxonane; TATP) is one of the most frequently used improvised explosives, often misused worldwide. In our previous studies, we had observed that the kind of acid used to catalyse its formation has a significant influence on TATP's properties. TATP was prepared using five different acids that are often used in improvised conditions. All of the samples were subjected to natural ageing in both open and closed vials at laboratory temperature. During ageing, TATP sublimes and decomposes. The changes in crystal size and shape after ageing were documented by optical microscopy. The mass loss was monitored about every third day during ageing. Samples prepared using sulphuric and perchloric acids lose weight more quickly than the others due to chemical decomposition. The friction sensitivity was determined for all samples before and after ageing. Neither the type of acid used nor the influence of closing the vials had any significant influence on the friction sensitivity after ageing. The friction sensitivity of all tested samples of TATP was about the same ? between that of lead azide and that of mercury fulminate.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 3; 251-260
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serum Cystatin C in Relation to Fat Mass Loss After Bariatric Surgery
    Autorzy:
    Śledziński, Tomasz
    Proczko-Markuszewska, Monika
    Kaska, Łukasz
    Stefaniak, Tomasz
    Świerczyński, Julian
    Powiązania:
    https://bibliotekanauki.pl/articles/1396727.pdf
    Data publikacji:
    2012-04-01
    Wydawca:
    Index Copernicus International
    Tematy:
    bariatric surgery
    cystatin C
    fat mass
    obesity
    weight loss
    Opis:
    Serum cystatin C concentration, generally accepted as renal function marker, is associated with cardiovascular risk and metabolic syndrome. Recent studies indicate that cystatin C increases in human obesity and that adipose tissue contributes to enhanced serum cystatin C concentration in obese subjects.The aim of the study was to assess whether a reduction in body and fat mass after bariatric surgery has any impact on serum cystatin C concentrations.Material and methods. Serum from 27 obese patients were tested before and 6 months after bariatric surgery. Twenty healthy subjects with normal body weight served as controls. Serum cystatin C concentrations were assayed by ELISA.Results. Serum cystatin C concentrations were significantly higher in obese patients compared with non-obese subjects. Decrease of body and fat mass after bariatric surgery resulted in improvement of several parameters associated with cardiovascular risk and metabolic syndrome, like serum lipids, blood pressure and insulin sensitivity. Surprisingly the mean postoperative serum cystatin C concentration was not significantly different from that before surgery. Serum creatinine and GFR also remained unchanged.Conclusion. The results presented here suggest that serum cystatin C concentration is not tightly associated with body and fat mass loss in obese patients after bariatric surgery.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 4; 202-207
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of degradation on the viscosity and molecular mass of poly(lactide acid) biopolymer
    Wpływ procesu degradacji na lepkość i masę cząsteczkową polilaktydu
    Autorzy:
    Ekiert, M.
    Mlyniec, A.
    Uhl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/327254.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    PLA
    biopolymers
    stability
    molecular model
    viscosity loss
    molar mass averages
    biopolimery
    trwałość
    model atomowy
    spadek lepkości
    średnie masowe
    Opis:
    In this paper, we present a study on stability of popular biopolymer poly(lactide acid) (PLA) under degradation process. As a main objective of this study we investigate an influence of polymer decomposition on decrease of its two physicochemical parameters – dynamic viscosity and molecular mass. To include the molar mass distribution we calculate three various mass averages: the number, the weight and the viscosity molar mass. To simulate the polylactide behavior at the atomic level we use molecular dynamics method in conjunction with reactive force field ReaxFF. To provide degradation conditions similar to human interior system we operate in the MD-NVT conditions at the temperature 310K. Based on reported in literature values of polylactide density we develop computational model of its amorphous structure. We achieve full compliance with expectations – obtained values of PLA viscosity and mass are steadily dropping. Determined trends confirm progressive polymer decomposition resulting in deterioration of polymer durability. The obtained results may be use in a future to predict a lifetime of biomedical polymer implants.
    Niniejszy artykuł przedstawia badania nad stabilnością popularnego biopolimeru - polilaktydu (PLA). Celem badań była zbadanie wpływu procesu degradacji PLA na jego wybrane właściwości fizykochemiczne tj. lepkość dynamiczną i masę cząsteczkową. Aby uwzględnić zjawisko polimolekularności obliczono trzy różne średnie masowe – średnią liczbową, wagową oraz lepkościową. Symulacja zachowania polilaktydu na poziomie atomowym została wykonana z użyciem metody dynamiki molekularnej przy współpracy z reaktywnym polem siłowym ReaxFF. Narzucone, przy pomocy zespołu kanonicznego NVT, warunki degradacji były zbliżone do warunków panujących we wnętrzu ludzkiego ciała. Opierając się na wartościach gęstości polilaktydu podawanych w literaturze opracowano także atomowy model jego struktury amorficznej. Otrzymane wyniki obliczeń są całkowicie zgodne z przewidywaniami – wartości lepkości i mas spadają wraz z postępem procesu degradacji skutkując obniżoną trwałością biomateriału. Uzyskane wyniki mogą w przyszłości posłużyć do budowy modelu predykcyjnego określającego czas życia polimerowych implantów.
    Źródło:
    Diagnostyka; 2015, 16, 4; 63-70
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the Frasnian-Famennian mass extinction: Comparing brachiopod faunas
    Autorzy:
    Copper, P
    Powiązania:
    https://bibliotekanauki.pl/articles/22494.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod fauna
    global loss
    Palmatolepis linguiformis
    climate cycle
    Palmatolepis rhenana
    Atrypida
    water setting
    mass extinction
    Brachiopoda
    South America
    Famennian
    shelf area
    Frasnian
    atrypid extinction
    Late Devonian
    Devonian
    reef habitat
    paleontology
    Opis:
    The Frasnian-Famennian (F-F) mass extinctions saw the global loss of all genera belonging to the tropically confined order Atrypida (and Pentamerida): though Famennian forms have been reported in the literafure, none can be confirmed. Losses were more severe during the Givetian (including the extinction of the suborder Davidsoniidina, and the reduction of the suborder Lissatrypidina to a single genus), but origination rates in the remaining suborder surviving into the Frasnian kept the group alive, though much reduced in biodiversity from the late Early and Middle Devonian. In the terminal phases of the late Palmatolepis rhenana and P. linguiformis zones at the end of the Frasnian, during which the last few Atrypidae dechned, no new genera originated, and thus the Atrypida were extirpated. There is no evidence for an abrupt termination of all lineages at the F-F boundary, nor that the Atrypida were abundant at this time, since all groups were in decline and impoverished. Atypida were well established in dysaerobic, muddy substrate, reef lagoonal and off-reef deeper water settings in the late Givetian and Frasnian, alongside a range of brachiopod orders which sailed through the F-F boundary: tropical shelf anoxia or hypoxia seems implausible as a cause for atrypid extinction. Glacial-interglacial climate cycles recorded in South America for the Late Devonian, and their synchronous global cooling effect in low latitudes, as well as loss of the reef habitat and shelf area reduction, remain as the most likely combined scenarios for the mass extinction events.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Minimum Pressure Drop Caused by the Condensation of Water Vapor in the Cooled Air Flowing in the Inclined Conduit
    Minimalna strata ciśnienia spowodowana kondensacją pary wodnej w chłodzonym powietrzu płynącym przewodem nachylonym
    Autorzy:
    Ptaszyński, Bogusław
    Kuczera, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/318286.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    dwufazowy przepływ bezpoślizgowy
    strata ciśnienia
    charakterystyka przewodu
    masowe źródła wody z kondensacji pary wodnej
    two-phase no-slip flow
    pressure loss
    flow characteristics of a duct
    water mass sources from water vapor condensation
    Opis:
    The paper presents methodology for determining water mass and pressure drop in ducts with fixed co-current and no-slip two-phase flow. The dispersed liquid phase (water) is present in the air as a result of wet air from underground excavations being distributed in some sections of a discharge pathway, or local water mass sources (or its local outlets) formed by the natural phenomenon of water vapor condensation. For such cases, static pressure losses were determined, which resulted from the force of gravity of the mass of water droplets occurring in the air stream in the duct.
    W pracy przedstawiono metodologię wyznaczania masy wody i spadku ciśnienia w przewodach z ustalonym współprądowym bezpoślizgowym przepływem dwufazowym. Zdyspergowana faza ciekła (woda) występuje w powietrzu w wyniku ochłodzenia strumienia wilgotnego powietrza na niektórych odcinkach drogi jego odprowadzenia z wyrobisk podziemnych lub w miejscach występowania lokalnych źródeł masy wody (lub jej lokalnych upustów) utworzonych przez naturalne zjawisko kondensacji pary wodnej przy mieszaniu się strumieni powietrza wilgotnego. Dla takich przypadków określono straty ciśnienia statycznego, które wynikały z siły grawitacji masy kropelek wody występujących w strumieniu powietrza w szybie wydechowym.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 1/2; 189-197
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

      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