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    Wyświetlanie 1-15 z 15
    Tytuł:
    Characterization of serum adiponectin and leptin in healthy perinatal dairy cows or cows with ketosis, and their effectson ketosis involved indices
    Autorzy:
    Shen, L.
    Qian, B.
    Xiao, J.
    Zhu, Y.
    Hussain, S.
    Deng, J.
    Peng, G.
    Zuo, Z.
    Zou, L.
    Yu, S.
    Ma, X.
    Zhong, Z.
    Ren, Z.
    Wang, Y.
    Liu, H.
    Zhou, Z.
    Cai, D.
    Hu, Y.
    Zong, X.
    Cao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087289.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adiponectin
    dairy cows
    ketosis
    leptin
    perinatal period
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 3; 373-381
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the height of overburden fractured zone in deep coal mining: case study
    Prognozowanie wysokości strefy spękań w warstwach nadkładu w podziemnych kopalniach węgla: studium przypadku
    Autorzy:
    Han, Y.
    Cheng, J.
    Huang, Q.
    Zou, D. H. S.
    Zhou, J.
    Huang, S.
    Long, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/218745.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wysokość strefy spękań w warstwie nadkładu
    symulacje numeryczne
    układ ortogonalny
    pomiary in-situ
    the hei ght of overburden fractured zone
    numerical simulation
    orthogonal design
    in-situ test
    Opis:
    In the process of coal extraction, a fractured zone is developed in the overburden above the goaf. If the fractured zone is connected with an aquifer, then water inrush may occur. Hence, research and analysis of the height of overburden fractured zone (HOFZ) are of considerable significance. This study focuses on the HOFZ determination in deep coal mining. First, general deformation failure characteristics of overburden were discussed. Second, a new method, numerical simulation by orthogonal design(NSOD), have been proposed to determinate the HOFZ in deep coal mining. Third, the validity of NSOD is verified in the practical application, compared with empiric al formula in Chinese Regulations and in-situ test. These three methods were applied to determine the HOFZ of working face No. 111303 in No. 5 coal mine. The pre dicted HOFZ of NSOD is found to be similar to the result of the in-situ test (8.9% relative error), whereas the HOFZ calculated by the empirical formula has extremely large error (25.7% relative error). Results show that the NSOD can reliably predict the HOFZ in deep coal mining and reduce time and expenses required for in-situ test.
    W trakcie prowadzenia wydobycia węgla w warstwie skalnej leżącej ponad zrobami powstaje strefa spękań. Jeśli nieciągłości te związane są z formacjami wodonośnymi, może nastąpić nagły wypływ wód do kopalni. Stąd też waga problemu i konieczność badania wysokości strefy spękań w warstwach nadkładu zalegających nad wyrobiskiem. W pracy tej główny nacisk położono na określenie wysokości strefy spękań warstwy nadkładu zalegającej ponad wyrobiskiem w kopalni podziemnej. W pierwszej części pracy przedstawiono główne charakterystyki powstawania deformacji i pęknięć w warstwach nadkładu. Następnie zaproponowano nową metodę symulacji numerycznych w układzie ortogonalnym i jej wykorzystanie do określania wysokości strefy spękań w warstwach nadkładu w kopalni podziemnej. Następnie powyższą metodę zweryfikowano w praktycznym zastosowaniu, jako poziomy odniesienia wykorzystano odpowiednie wzory empiryczne określone w przepisach obowiązujących w Chinach oraz wyniki pomiarów in-situ. Powyższe trzy metody zastosowane zostały do określenia wysokości strefy spękań w warstwach nadkładu przy prowadzeniu ściany 111303 w kopalni węgla nr 5. Wyniki obliczeń wysokości strefy spękań uzyskane w oparciu o zaproponowaną nową metodę w dużym stopniu pokrywały się z wynikami pomiarów in-situ (błąd względny 8.9%); podczas gdy obliczenia wysokości strefy spękań w oparciu o odpowiednie wzory empiryczne obarczone były dużym błędem (błąd względny 25.7%). Uzyskane wyniki wskazują wiarygodność obliczeń w oparciu o zaproponowaną metodę, co pozwoli na ograniczenie czasu i kosztów związanych z wykonywaniem pomiarów in-situ.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 3; 617-631
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The surface features of activated stibnite surface with copper or lead ion
    Autorzy:
    Cao, Q.
    Huang, Y.
    Zou, H.
    Wen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/110393.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stibnite
    flotation
    activation
    active layer
    Opis:
    Cu2+ and Pb2+ are widely used as activators for the flotation of stibnite. In this work, by the treatment of Cu2+ or Pb2+, the activation product and the thickness of activation layer on the stibnite surface were both investigated. Based on the flotation results, zeta potential analysis and X-ray photoelectron spectroscopy (XPS) study, it was found that Cu2+ was reduced to Cu+ at the stibnite surface and a layer of Cu2S was formed at the surface. While, a PbS layer presenting at the stibnite surface is responsible for the activation flotation of stibnite with Pb2+. Time of flight secondary ion mass spectrometry (TOF-SIMS) analysis further implies that, when stibnite was activated with 5×10-5 mol/dm3 of CuSO4 or Pb(NO3)2, the thickness of Cu2S layer on the Cu-activated surface was close to 2.7 nm, while the thickness of PbS layer was about 1.8 nm on the Pb-activated surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 763-770
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Denitrifying phosphorus accumulating organisms enrichment and their characteristics in a denitrifying enhanced biological phosphorus removal system
    Autorzy:
    Zou, H.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/206936.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biological water treatment
    wastewater treatment
    nitrogen
    phosphorus
    biologiczne uzdatnianie wody
    oczyszczanie ścieków
    azot
    fosfor
    Opis:
    Denitrifying phosphorus accumulating organisms (DPAOs) play an important role in simultane-ous removal denitrifying nitrogen (N) and phosphorus (P). Their enrichment and characteristics were investigated. A denitrifying EBPR reactor, performing continuous anaerobic/anoxic conditions, was used to enrich DPAOs in this study. Through 60 days operation, DPAOs was successfully cultivated in the denitrifying EBPR system and P concentration in the effluent was stable and low with less than 0.5 mg/dm3. Energy dispersive spectroscopy (EDS) analysis showed that P content in anoxic end sludge gradually increased with enrichment operation, which accounted for 2.9, 4.7, 6.2, and 7.9 wt. % in sludge samples at day 0 (i.e., seed sludge), and days 20, 40 and 60, respectively. Based on the batch test, a significant positive correlation was found between COD consumption and P release in anaerobic conditions and between nitrogen removal and phosphorus uptake in anoxic conditions. Furthermore, in anaerobic conditions, the P release rate was 4.2 mg P/(g MLSSh) being higher than the P uptake rate (2.8 mg P/(g MLSS h)) in anoxic conditions. Despite this, total anaerobic P release (8.5 mg P/(g MLSS)) was lower than anoxic P uptake total amount (11.2 mg P/(g MLSS)), implying an excess P uptake in anoxic environment. One whole cycle displayed the obviously denitrifying simultaneous nitrogen and phosphorus removal with more than 95% removal efficiencies in the denitrifying EBPR system.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 225-237
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research on energy release characteristics of water-bearing sandstone alongshore wharf
    Autorzy:
    Wang, S.
    Zhao, Y.
    Zou, Z.
    Jia, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/258604.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sandstone
    energy release
    water content
    confining pressure
    Opis:
    It is important to evaluate the deformation and failure of sandstone in the foundation engineering of coast, river bank and lake shore. While the deformation and failure of sandstone is a comprehensive result of energy release and dissipation, and energy release is the internal reason which leads to global failure of the sandstone. The experimental analysis is conducted on the character of energy revolution of the sandstone specimen by rating loading and unloading, and the catastrophe model is followed in analyzing elastic strain energy accumulation and release in rock deformation and failure. The index based on elastic energy release is proposed to assess the rock brittleness. It is found that increasing water content is to relieve energy release and catastrophe failure of the rock specimen, and weakening the capacity of elastic energy storage. The peak and residual values of elastic energy are raised as the confining pressure increases, and the post-peak released energy decreases progressively. The confining pressure strengthens energy storage and inhibits energy release of the rock specimen, and saturation of rock will weaken this inhibit effect. The brittleness index decreases with increasing confining pressure as the rock specimen transforming from brittle to ductile.
    Źródło:
    Polish Maritime Research; 2017, S 2; 147-153
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of induced crystallization reaction in a novel process of nutrients removal coupled with phosphorus recovery from domestic wastewater
    Autorzy:
    Zou, H.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/205404.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phosphorus recovery
    induced crystallization
    IC
    hydroxyapatite
    HAP
    domestic wastewater
    enhanced biological phosphorus removal
    EBPR
    Opis:
    Phosphorus removal and recovery from domestic wastewater is urgent nowadays. A novel process of nutrients removal coupled with phosphorus recovery from domestic sewage was proposed and optimization of induced crystallization reaction was performed in this study. The results showed that 92.3% of phosphorus recovery via induced Hydroxyapatite crystallization was achieved at the optimum process parameters: reaction time of 80 min, seed crystal loads of 60 g/L, pH of 8.5, Ca/P mole ratio of 2.0 and 4.0 L/min aeration rate when the PO43-P concentration was 10 mg/L in the influent, displaying an excellent phosphorus recovery performance. Importantly, it was found that the effect of reaction temperature on induced Hydroxyapatite crystallization was slight, thus favoring practical application of phosphorus recovery method described in this study. From these results, the proposed method of induced HAP crystallization to recover phosphorus combined with nutrients removal can be an economical and effective technology, probably favoring the water pollution control and phosphate rock recycle.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 4; 33-38
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Discoloration of Cotton/Kapok Indigo Denim Fabric by Using a Carbon Dioxide Laser
    Odbarwianie tkanin typu denim z mieszanek bawełny i kapoku poprzez zastosowanie lasera
    Autorzy:
    Du, W.
    Gosh, R. C.
    Zuo, D.-Y.
    Zou, H.-T.
    Tian, L.
    Yi, C.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/949450.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    kapok fibre
    denim fabric
    laser treatment
    colour-fading
    air permeability
    włókna kapok
    tkaniny denim
    obróbka laserowa
    przepuszczalność powietrza
    Opis:
    In this work, a carbon dioxide laser was used for the color-fading treatment of cotton/kapok denim fabrics. The results were analyzed thoroughly and compared with those of cotton denim fabric and PET denim fabric. Results showed that with laser treatment, the fabrics were colour-faded, and the K/S value of cotton/kapok fabric was reduced, while there was little change in the thickness and permeability. Because the internal air of the kapok fiber was squeezed out, the tensile strength of the fabric was decreased. The influence of laser power and speed on the kapok denim was also investigated. With an increase in the laser power and decrease in the speed, both the K/S values and strength decreased significantly. However, the changes were negligible for the thickness and permeability of the cotton/kapok denim fabric. It is therefore concluded that kapok is a good denim fabric material for the laser process.
    Wyniki analizowano i porównywano z wynikami uzyskiwanymi z tkanin denim z bawełny i PET. Wyniki wykazały, że przy zastosowaniu lasera zredukowano intensywność koloru, a wartość K/S została zredukowana przy małych zmianach grubości i przepuszczalności powietrza. Ponieważ wewnętrzne powietrze zawarte we włóknach kapoku było wyciskane na zewnątrz, wytrzymałość tkanin została zmniejszona. Badano również wpływ mocy lasera oraz szybkości przesuwania tkaniny denim na wartość KS i wytrzymałość. Stwierdzono, że wraz ze wzrostem mocy lasera i zmniejszeniem szybkości przesuwu tkaniny zarówno wartość KS jak i wytrzymałość zostały znacznie zmniejszone. Jednakże, zmiany grubości i przepuszczalności powietrza były minimalne. Stwierdzono, że włókna kapok są dobrym materiałem do tkanin typu denim.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 4 (118); 63-67
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and sources of n-alkanes in surface sediments of Taihu Lake, China
    Autorzy:
    Yu, Y.
    Li, Y.
    Guo, Z.
    Zou, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/205298.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    n-alkanes
    surface sediments
    Taihu Lake
    Opis:
    The last study on n-alkanes in surface sediments of Taihu Lake was in 2000, only 13 surface sediment samples were analysed, in order to have a comprehensive and up-to-date understanding of n-alkanes in the surface sediments of Taihu Lake, 41 surface sediment samples were analyzed by GC-MS. C10 to C37 were detected, the total concentrations of n-alkanes ranged from 2109 ng g−1 to 9096 ng gg−1 (dry weight). There was strong odd carbon predominance in long chain n-alkanes and even carbon predominance in short chain n-alkanes. When this finding was combined with the analysis results of wax n-alkanes (WaxCn), carbon preference index (CPI), unresolved complex mixture (UCM), hopanes and steranes, it was considered that the long chain n-alkanes were mainly from terrigenous higher plants, and that the short chain n-alkanes mainly originated from bacteria and algae in the lake, compared with previous studies, there were no obvious anthropogenic petrogenic inputs. Terrestrial and aquatic hydrocarbons ratio (TAR) and C21−/C25+ indicated that terrigenous input was higher than aquatic sources and the nearshore n-alkanes were mainly from land-derived sources. Moreover, the distribution of short chain n-alkanes presented a relatively uniform pattern, while the long chain n-alkanes presented a trend that concentrations dropped from nearshore places to the middle of lake.
    Źródło:
    Archives of Environmental Protection; 2016, 42, 1; 49-55
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Rolling Friction Coefficient on Inter-Particle Percolation in a Packed Bed by Discrete Element Method
    Autorzy:
    Zhou, H.
    Luo, Z.
    Zhang, T.
    You, Y.
    Li, H.
    Zou, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/356261.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inter-particle percolation
    rolling friction coefficient
    discrete element method;
    percolation velocity
    dispersion coefficient
    Opis:
    Rolling friction representing the energy dissipation mechanism with the elastic deformation at the contact point could act directly on particle percolation. The present investigation intends to elucidate the influence of rolling friction coefficient on inter-particle percolation in a packed bed by discrete element method (DEM). The results show that the vertical velocity of percolating particles decreases with increasing the rolling friction coefficient. With the increase of rolling friction coefficient, the transverse dispersion coefficient decreases, but the longitudinal dispersion coefficient increases. Packing height has a limited effect on the transverse and longitudinal dispersion coefficient. In addition, with the increase of size ratio of bed particles to percolation ones, the percolation velocity increases. The transverse dispersion coefficient increases with the size ratio before D/d<14. And it would keep constant when the size ratio is greater than 14. The longitudinal dispersion coefficient decreases when the size ratio increases up to D/d=14, then increases with the increase of the size ratio. External forces affect the percolation behaviours. Increasing the magnitude of the upward force (e.g. from a gas stream) reduces the percolation velocity, and decreases the dispersion coefficient.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1795-1804
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motion prediction of catamaran with a semisubmersible bow in wave
    Autorzy:
    Sun, H.
    Jing, F.
    Jiang, Y.
    Zou, J.
    Zhuang, J.
    Ma, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/258596.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    SSB catamaran
    model test
    overset grid
    motion region
    motion response
    Opis:
    Compared with standard vessels, a slender catamaran with a semi-submerged bow (SSB) demonstrates superior seakeeping performance. To predict the motion of an SSB catamaran, computational fluid dynamics methods are adopted in this study and results are validated through small-scale model tests. The pitch, heave, and vertical acceleration are calculated at various wavelengths and speeds. Based on the overset grid and motion region methods, this study obtains the motion responses of an SSB catamaran in regular head waves. The results of the numerical studies are validated with the experimental data and show that the overset grid method is more accurate in predicting the motion of an SSB catamaran; the errors can be controlled within 20%. The movement data in regular waves shows that at a constant speed, the motion response initially increases and then decreases with increasing wavelength. This motion response peak is due to the encountering frequency being close to the natural frequency. Under identical sea conditions, the motion response increases with the increasing Froude number. The motion prediction results, that derive from a shortterm irregular sea state, show that there is an optimal speed range that can effectively reduce the amplitude of motion.
    Źródło:
    Polish Maritime Research; 2016, 1; 37-44
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel process of dye wastewater treatment by linking advanced chemical oxidation with biological oxidation
    Autorzy:
    Zou, H.
    Ma, W.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/204846.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dye wastewater
    Fenton's oxidation
    biological oxidation
    biological aerated filter
    advanced oxidation processes
    Opis:
    Dye wastewater is one of typically non-biodegradable industrial effluents. A new process linking Fenton’s oxidation with biological oxidation proposed in this study was investigated to degrade the organic substances from real dye wastewater. During the combination process, the Fenton’s oxidation process can reduce the organic load and enhance biodegradability of dye wastewater, which is followed by biological aerated filter (BAF) system to further remove organic substances in terms of discharge requirement. The results showed that 97.6% of chemical oxygen demand (COD) removal by the combination process was achieved at the optimum process parameters: pH of 3.5, H22
    Źródło:
    Archives of Environmental Protection; 2015, 41, 4; 33-39
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Of Low-Temperature Annealing On The Properties Of Ni-P Amorphous Alloys Deposited Via Electroless Plating
    Wpływ oceny mikrostruktury na odporność korozyjną wyżarzonego stopu amorficznego Ni-P
    Autorzy:
    Zhao, G.
    Zou, Y.
    Zhang, H.
    Zou, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351971.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-P amorphous
    local atomic structure
    corrosion resistance
    microhardness
    stopy amorficzne Ni-P
    lokalna struktura atomowa
    odporność na korozję
    mikrotwardość
    Opis:
    Amorphous Ni-P alloys were prepared via electroless plating and annealing at 200°C at different times to obtain different microstructures. The effects of low-temperature annealing on the properties of amorphous Ni-P alloys were studied. The local atomic structure of the annealed amorphous Ni-P alloys was analyzed by calculating the atomic pair distribution function from their X-ray diffraction patterns. The results indicate that the properties of the annealed amorphous Ni-P alloys are closely related to the order atomic cluster size. However, these annealed Ni-P alloys maintained their amorphous structure at different annealing times. The variation in microhardness is in agreement with the change in cluster size. By contrast, the corrosion resistance of the annealed alloys in 3.5 wt% NaCl solution increases with the decrease in order cluster size.
    Amorficzne stopy Ni-P otrzymane metodą powlekania bezprądowego wyżarzano w temperaturze 200°C w różnych czasach, w celu otrzymania zróżnicowanej mikrostruktur. Badano wpływ mikrostruktury wyżarzanych stopów amorficznych Ni-P na ich odporność korozyjną w roztworze 3,5% wag. NaCl. Wyniki wskazują, że wielkość klastra w wyżarzanych stopach amorficznych Ni-P najpierw zmniejszyła się, a następnie zwiększyła wraz z czasem wyżarzania. Odporność badanych stopów na korozję jest ściśle związana z wielkością klastra, mimo, że stopy te po wyżarzaniu w różnych czasach zachowują strukturę amorficzną. Odporność wyżarzanych stopów amorficznych Ni-P w roztworze 3,5% wag. NaCl zwiększa się wraz ze zmniejszeniem się klastra.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 865-869
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test studies of the resistance and seakeeping performance of a trimaran planing hull
    Autorzy:
    Ma, W.
    Sun, H.
    Zou, J.
    Zhuang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259495.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    trimaran planing hull
    appendix
    resistance
    seakeeping
    model test
    Opis:
    Towing tank tests in calm water were performed on a trimaran planing hull to verify its navigational properties with different displacements and centres of gravity, as well as to assess the effects of air jets and bilge keels on the hull’s planing capabilities, and to increase the longitudinal stability of the hull. Hydrostatic roll tests, zero speed tests, and sea trials in the presence of regular waves were conducted to investigate the hull’s seakeeping ability. The test results indicate that the influence of the location of the centre of gravity on the hull resistance is similar to that of a normal trimaran planing hull; namely, moving the centre of gravity backward will reduce the resistance but lower the stability. Bilge keels improve the longitudinal stability but slightly affect the resistance, and the presence of air jets in the hull’s channels decreases the trim angle and increases heaving but has little effect on the resistance. Frequent small-angle rolling occurs in waves. The heaving and pitching motions peak at the encounter frequency of , and the peaks increase with velocity and move towards greater encounter frequencies. When the encounter frequency exceeds, the hull motion decreases, which leads to changes in the navigation speed and frequency.
    Źródło:
    Polish Maritime Research; 2015, 1; 22-27
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Various Additives on the Characteristics of Bubbles Originating from the Combustion of Pyrotechnic Mixtures
    Autorzy:
    Ouyang, D.-H.
    Duan, D.-L.
    Zou, Y.-X
    Powiązania:
    https://bibliotekanauki.pl/articles/358784.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    additives
    pyrotechnic mixtures
    bubble
    underwater combustion
    Opis:
    The bubbling behaviour originating from the combustion of pyrotechnic mixtures of KClO4/Mg-50%Al alloy, and with additives such as nitrocellulose (NC) and urotropine, were studied by high speed photography. The results revealed that with the addition of the additives the combustion pressure and the gas flow rates increased in the order KClO4/Mg-50%Al/NC (3) > KClO4/Mg-50%Al/urotropine (2) > KClO4/Mg-50%Al (1). Additionally, it is confirmed that the bubbling phenomena can be classified into various stages, i.e. single bubbling, pairing and single coalescence, double coalescence and so on.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 4; 603-611
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test research on the resistance performance of high-speed trimaran planing hull
    Autorzy:
    Ma, W.
    Sun, H.
    Zou, J.
    Yang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259708.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    trimaran planing hull
    side hulls
    high speed
    step
    resistance
    model test
    Opis:
    In order to identify high-speed navigation ability of trimaran planing hull, as well as investigate the characteristics of its resistance and hull form, ship model tests were conducted to measure resistance, trim and heaving under different displacements and gravity centre locations. The test results were then used to study the influence of spray strips on resistance and sea-keeping qualities. Moreover, different planning surfaces were compared in the model tests which helped to look into influence of steps on hull resistance and its moving position. Also, the resistance features of monohull and trimaran planing hulls, both with and without steps, were compared to each other. From the tests it can be concluded that: the two auxiliary side hulls increase aerodynamic lift at high-speed motion, which improves the hydrodynamic performance; the trimaran planing hull has also excellent longitudinal stability and low wave-making action; when Fr∇> 8, its motion is still stable and two distinct resistance peaks and two changes of sailing state (the second change is smaller) appear; spray strips are favourable for sea-keeping qualities at high speed. The change trends before the second resistance peak as to the resistance and sailing behaviour of trimaran planing hull without steps are the same as for monohull planing hull without steps. but when steps in both hulls exist the change trends are different; more specifically: trimaran planing hull with steps has only one resistance peak and its resistance increases along with its speed increasing, and the resistance is improved at the increasing speed as the number of steps increases.
    Źródło:
    Polish Maritime Research; 2013, 4; 45-51
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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