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Tytuł:
Photoexcitation Spectroscopy and Material Alteration with Free-Electron Laser
Autorzy:
Sturmann, J.
Albridge, R. G.
Barnes, A. V.
Gilligan, J.
Graham, M. T.
Mckinley, J. T.
Ueda, A.
Wang, W.
Yang, X.
Tolk, N. H.
Davidson, J. L.
Margaritondo, G.
Powiązania:
https://bibliotekanauki.pl/articles/1963341.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.La
79.20.Ds
63.20.-e
79.60.Jv
73.20.At
Opis:
As synchrotron radiation sources have been used for many experiments in the ultraviolet and X-ray regimes, the free-electron laser is an excellent source for a wide array of infrared-photon projects and applications. The free-electron laser delivers a beam of powerful tunable pulsed radiation which provides the opportunity for spatial and temporal localization of the energy delivered at any desired wavelength within the 2-10 μ regime. One application discussed employs the free-electron laser for spectroscopy as a probe of electronic and vibrational structures. Another application uses the free-electron laser beam as a tool for altering materials in a fundamentally new way.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 689-696
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrydowy algorytm wzajemnej entropii do oceny niezawodności systemów typu konfiguracja-redundancja
A hybrid cross-entropy algorithm for reliability assessment of confi guration-redundancy system
Autorzy:
Wang, G. B.
Huang, H. Z.
Sun, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/301627.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
ocena niezawodności
konfiguracja-redundancja
optymalizacja systemu
metoda wzajemnej entropii
generowanie próbek stochastycznych
reliability assessment
configuration-redundancy
system optimization
cross-entropy method
stochastic samples generating
Opis:
Stosowane w praktyce inżynieryjnej różnorakie redundancje zwiększają dostępność danego systemu zarazem powiększając jego złożoność, co czyni niepewnymi ocenę niezawodności i wykrywanie uszkodzeń komponentów systemu. Wobec powyższego, poddano badaniom system typu konfguracja-redundancja oraz sformułowano jego funkcję niezawodności. Kiedy niedostępna jest wiedza na temat poprzednich uszkodzeń komponentów systemu, problem uszkodzeń systemu ma charakter problemu stochastycznego. Tymczasem, aby wyeliminować niepewność systemu, konieczne jest wykrycie uszkodzeń w serii komponentów. Zaproponowano model przewidywanej najkrótszej ścieżki oraz model wykrywania uszkodzeń mające służyć optymalizacji niezawodności. Metodę wzajemnej entropii wykorzystano jako algorytm heurystyczny do oceny niezawodności systemu i wykrywania uszkodzeń komponentów. Zastosowane stochastyczne podejście do generowania próbek umożliwia otrzymanie ważnych próbek. W celu poprawienia wydajności obliczeniowej, stworzono hybrydowy algorytm wzajemnej entropii, który łączy w sobie stochastyczne podejście do generowania próbek i metodę wzajemnej entropii. Wyniki numeryczne wskazują na potencjalną poprawę alokacji niezawodności złożonych systemów, która prowadziłaby do jak najlepszego działania wszystkich komponentów systemu.
Engineering practices with various redundancies increase the availability of a system as well as complexity which bring the uncertainty of reliability estimation and failure detection of system components. Under such conditions, a confi gurationredundancy system is studied and the reliability function of the system is formulated. When no prior failure of system components is available, failure problem of system is a stochastic shortest path problem. Meanwhile to eliminate the uncertainty of system, it is necessary to detect failures series of components. The expected shortest path model and failure detecting model are proposed for system reliability optimization. The Cross-Entropy (CE) method is applied as a heuristic algorithm to estimate the system reliability and detect the failure of components. A stochastic sample generating approach is designed to obtain some valid samples. In order to improve the effi ciency of computing, a hybrid CE algorithm which combines the stochastic sample generating approach and the CE method is developed. Numerical results indicate potential improvements in reliability allocation of complex systems that would lead to the best performances of all system components.
Źródło:
Eksploatacja i Niezawodność; 2009, 3; 4-13
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stream networks and knickpoints in the Sanjiangyuan Region
Rozwoj progow skalnych oraz morfologia rzek w regionie Sanjiangyuan
Autorzy:
Wang, Z
Yu, G.-A.
Brierley, G.
Liu, L.
Powiązania:
https://bibliotekanauki.pl/articles/81661.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
China
stream network
knickpoint
Sanjiangyuan region
morphology
river
Yangtze River
Yellow River
drainage network
Opis:
The source area of the Lancang (Mekong), Yangtze and Yellow rivers is named in Chinese Sanjiangyuan (source of three rivers). Geographical characteristics of these rivers, and various rivers at the margin of the Qinghai- Tibetan Plateau (Jialing, Minjiang, Dadu, Yalong and Jinsha) are summarized from fi eld investigations along with digital elevation model (DEM) analyses and satellite images. Uplift of the Qinghai-Tibetan Plateau has resulted in an asymmetrical distribution of tributaries for stream networks at the margins of the plateau. Almost all tributaries join the trunk stream from the northwest. Three types of drainage network are evident: plume, nervation and dendritic. In general, plume networks have a large number of first order streams. Nervation networks have a main stream and parallel tributaries. Dentritic networks are characrterized by continuous bifurcation and have a branch-like appearance. Most stream networks in the Sanjiangyuan region are of the nervation type. Several large knickpoints are evident along the longitudinal profi les of the Yellow and Yangtze Rivers. Channel aggradation immediately upstream of these knickpoints marks a transition in river processes from vertical bed evolution (i.e. incision) to horizontal channel adjustment (and associated braided and anabranching channels).
W artykule przedstawiono proces rozwoju progów skalnych wzdłuż rzek Yellow i Yangtze. Wykazano wpływ progów skalnych na zmiany morfologiczne dna koryt rzek. Głównie skoncentrowano się na zmianach agradacyjnych powyżej omawianych progów. Progi te są wyznacznikami zmian charakteru koryta rzecznego, z pionowo wciętego na wielonurtowy, roztopowy o szerszym korycie. Badania wykonano w rejonie Qinghai_Tibetan Plateau, zwanym obszarem źródłowym trzech rzek – oprócz wyżej wspomnianych również rzeka Mekong.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 79-91
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chinese Drivers’ Risky Driving and Risk Taking in Other Life Situations
Autorzy:
Wang, P.
Rau, P. L. P.
Salvendy, G.
Powiązania:
https://bibliotekanauki.pl/articles/90106.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
Chinese drivers
risky driving
risk taking
Opis:
The first aim of this study was to investigate Chinese drivers’ preferences to risk-taking behaviors encountered in daily life, including safety and health, finance, recreation, social areas, and ethics. The second aim was to evaluate the association between Chinese risky driving and other risk-taking behaviors. A questionnaire survey was conducted with the 324 Chinese drivers who responded. Through a principal component analysis an 8-factor structure was created to interpret different domains of risk-taking behaviors. They were risks in driving, ethics, recreation, gambling, abused health (voluntarily engaging in smoking and binge drinking), investment, ignored health (ignoring personal health, such as eating expired food), and monetary social areas. The result of multiple regression analysis showed that drivers who were likely to engage in driving risks were also likely to take risks in domains of ethics, abused health, gambling, investment, recreation, and ignored health.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 2; 155-164
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demonstration of a new indicator for studying upwelling in the Northern South China Sea
Autorzy:
Lin, L.
Wang, Y.-S.
Sun, C.-C.
Li, N.
Wang, H.
Mitchell, B.G.
Wu, M.-L.
Song, H.
Wu, J.-F.
Powiązania:
https://bibliotekanauki.pl/articles/48889.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
China Sea
cluster analysis
multivariate statistical analysis
principal component analysis
remote sensing
satellite monitoring
sea surface temperature
silicate
spatial distribution
upwelling
Opis:
In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.
Źródło:
Oceanologia; 2011, 53, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive solutions of arbitrary order nonlinear fractional differential equations with advanced arguments
Autorzy:
Ntouyas, S. K
Wang, G.
Zhang, L.
Powiązania:
https://bibliotekanauki.pl/articles/256029.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
positive solution
advanced arguments
fractional differential equations
superlinear (sublinear) condition
uniqueness
Opis:
In this paper, we investigate the existence and uniqueness of positive solutions to arbitrary order nonlinear fractional differential equations with advanced arguments. By applying some known fixed point theorems, sufficient conditions for the existence and uniqueness of positive solutions are established.
Źródło:
Opuscula Mathematica; 2011, 31, 3; 433-442
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Studies of High-nitrogen-containing Energetic Compounds Based on the s-Tetrazine Unit
Autorzy:
Man, T. T.
Wang, K.
Zhang, J.G.
Niu, X. Q.
Zhang, T. L.
Powiązania:
https://bibliotekanauki.pl/articles/358527.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
high-energy-density materials (HEDMs)
substituted s-tetrazine
compounds
electronic properties
thermodynamic properties
detonation
properties
Opis:
In order to develop new high-energy-density materials (HEDMs), we have investigated 12 substituted s-tetrazine (TZ) compounds, where s-tetrazine was substituted by amino, amido and related groups. Density functional theory (DFT) was used to predict the optimized geometries, electronic structures, total energy, heats of formation (HOFs) and densities. In addition the detonation properties were evaluated by using the VLW equation of state (EOS). The standard enthalpy of formation, the Gibbs free energy, entropy and equilibrium constants were used to estimate the success of the synthetic substitution reactions, which provided theoretical support for practical work. The bond dissociation energy (BDE) of bond C-R was calculated at each stage of the substitution reaction. The calculated results showed that substitution of amino, amido and their derivatives in the TZ ring enhances the HOF values and is favorable for increasing the thermal stability. The calculated detonation properties indicated that incorporating the above groups into the TZ ring is benefcial for improving the explosive performance. Considering the detonation properties and thermal stability, the 12 derivatives may be regarded as promising candidates as high-energy-density materials (HEDMs).
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 2; 171-189
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally induced damage in hexanitrohexaazaisowurtzitane
Autorzy:
Tian, Q.
Yan, G.
Sun, G.
Huang, C.
Xie, L.
Chen, B.
Huang, M.
Li, H.
Liu, X.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/358735.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
CL-20
SAXS
AFM
thermal effects
voids
Opis:
The evolution of the microstructure of hexanitrohexaazaisowurtzitane (CL-20) after a thermal stimulus plays a key role in the performance of CL-20. In the current work, microstructural variations of CL-20 caused by thermal treatment were investigated by X-ray diffraction, in situ variable-temperature optical microscopy, atom force microscopy, and small-angle X-ray scattering. A wave-like process, an abrupt volume expansion, movement, and fragmentation of CL-20 particles during phase transition were observed. After the phase transition (160 °C) the CL-20 sample acquired a very rough surface with numerous dimple depressions, and during the thermal decomposition stage (200 °C) a large number of voids were produced in both the bulk and the surface of the CL-20.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 3; 359-369
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors Affecting the Measurement of the Percentage of Gaseous Products from Boron-based Fuel-rich Propellants
Autorzy:
Liu, L.-L.
He, G.-Q.
Wang, Y.-H.
Liu, P.-J.
Powiązania:
https://bibliotekanauki.pl/articles/358720.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
fuel-rich propellant
percentage gaseous products
combustion
filter media
Opis:
Acid-washed asbestos, carbon fibre, and MgO with carbon fibre were used as the filter media in order to compare their filtering qualities in the estimation of the percentage of gaseous products (PGP) arising from the combustion of singlebase propellants, double-base propellants, and boron-based fuel-rich propellants. The comparison was based on an analysis of the experimentally registered influence of the propellant formulation, the propellant load, the maximum chamber pressure and the thickness of the MgO filter layer on the PGP from the fuel-rich propellant, and in particular on the PGP produced by combustion of boron-based fuel-rich propellant. The results showed that the experimental values of the PGP were closer to the theoretically predicted values when carbon fibre mixed with MgO powder was used as the filter medium. The PGP of boron-based fuel-rich propellant increased when the AP was in part replaced by HMX, when the AP content was increased and when boron was in part replaced by magnesium-aluminum alloy. In terms of the apparatus used in these experiments, the propellant loading density was found to have little correspondence with the PGP for boron-based fuel-rich propellant. The optimal propellant loading density for the chamber volume of 85 cm3 was found to be 2-2.5 g, in view of the reliability and safety of the experiment. It is emphasised that the thickness of the MgO filter layer is very important for the accuracy and reliability of the experiment, and that the optimum should be determined by experiment.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 15-29
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multiplex PCR for simultaneous detection of classical swine fever virus, African swine fever virus, highly pathogenic porcine reproductive and respiratory syndrome virus, porcine reproductive and respiratory syndrome virus and pseudorabies in swines
Autorzy:
Hu, L.
Lin, X.Y.
Yang, Z.X.
Yao, X.P.
Li, G.L.
Peng, S.Z.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/30249.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In this assay, we developed and evaluated a multiplex PCR (mPCR) for its ability in detecting multiple infections of swine simultaneously. Four pairs of primers were used to detect five viruses. Specific primers were designed for classical swine fever virus (CSFV), African swine fever virus (ASFV) and pseudorabies (PRV). A pair of primers was designed prudently for two different types of porcine reproductive and respiratory syndrome virus that respectively were porcine reproductive and respiratory syndrome virus (PRRSV), highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV). The detection limits of the mPCR were 1.09×10⁴, 1.50×10³, 2.10×10³, 1.30×10³ and 8.97×10² copies/reaction for CSFV, ASFV, HP-PRRSV, PRRSV and PRV, respectively. A total of 49 clinical specimens were tested by the mPCR, and the result showed that co-infection by two or three viruses was 51%. In conclusion, the PCR is a useful tool for clinical diagnosis of not only single infections but also mixed infections in swines.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A super depth of field height measurement based on local disparity
Autorzy:
Cui, L.
Liu, Y.
Yu, M.
Jiang, G.
Fan, S.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173522.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microscopes
binocular vision
local disparity map
depth of field (DOF)
height measurement
Opis:
A super depth of field height measurement method is proposed to measure the object height with the optical stereoscopic microscope. The quasi-Euclidean epipolar rectification algorithm is utilized on the original stereoimage to obtain rectified stereoimages and calibrate two camera parameters. Then, feature points are obtained by the SURF (speed up robust feature) algorithm and their corresponding disparities are calculated. The disparity-depth of field curve is fitted by combining the step height values of a stepper motor. Moreover, through local disparity value got from feature points on the object, the relative shift height is calculated through regression analysis. Finally, according to binocular vision geometry, the thickness of the object can be calculated. Experimental results show that the measurement error in Z direction is from 1.51% to 7.71%, which indicates that the proposed method is able to measure the height of a microobject beyond depth of field within a tolerant error.
Źródło:
Optica Applicata; 2015, 45, 2; 205-214
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric Interaction between Two Identical Conducting Spheres in a Uniform Electric Field
Autorzy:
Gao, X.
Wang, Q.
Li, C.
Hu, L.
Sun, G.
Powiązania:
https://bibliotekanauki.pl/articles/1401870.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.Cv
47.65.Gx
Opis:
An experimental apparatus is devised to measure the interaction between two spheres separated by a small gap in a uniform electric field. The results show that the interaction between two conducting spheres is near that between two dielectric spheres with high permittivity. Accordingly, the calculation can be simplified by mirror image method, for it is only available for conducting system. A method using multiple mirror images of point charges is put forward to analyze the induction of two identical conducting spheres in a uniform electric field. The key operation on how to add compensative charges is emphasized and given out in detail. The results from experiment and calculation are compared, and they agree with each other very well.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 289-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory investigation of self-healing properties on geosynthetic clay liners with flaw
Autorzy:
Zhang, G.-W.
Zhang, H.-Y.
Wang, J.-F.
Zhou, L.
Liu, P.
Jiang, X.
Powiązania:
https://bibliotekanauki.pl/articles/204652.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
landfills
geosynthetic clay liner
self healing
hydraulic conductivity
Opis:
The objective of this paper is to evaluate the self- healing properties of a commercially-available geosynthetic clay liner (GCL) using flexible-wall permeameter. The GCLs are produced by the same factory, but the contents of bentonite are different. Also the hydraulic conductivities (HC) of GCLs with no defect are different. In this study, specimens were completely saturated under the backpressure of 20 kPa before the test. Permeability tests were performed on GCL specimens with penet rating flaw and also on specimens permeated with distilled water and CaCl2 solutions. The test results were presented and discussed. Experimental results showed that the GCL with penetrating flaw did not exhibit complete self-healing in the case of flaw. After 120 days, the hydraulic conductivity increased by approximately an order of magnitude. In addition, CaCl2 solutions had a significant influence on the hydraulic conductivity. The research findings might be of interest to researchers and engineers who design liners for landfills and other liquid containment facilities.
Źródło:
Archives of Environmental Protection; 2015, 41, 1; 53-58
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disparity servoing based fast autofocusing method for stereomicroscope
Autorzy:
Liu, Y.
Yu, M.
Cui, L.
Jiang, G.
Wang, G.
Fan, S.
Powiązania:
https://bibliotekanauki.pl/articles/174449.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
autofocusing
stereomicroscope
stereomicroscopic images
disparity
Opis:
A disparity servoing based fast autofocusing method is proposed for stereomicroscopes according to linear relationship between the disparity change in stereomicroscopic images and the move distance of a motorized translation stage. For a certain stereomicroscope, the calibration of a disparity range of clear images at each magnification is implemented offline. After that, the disparity of the stereomicroscopic image is used as an index to represent the sharpness of an arbitrary image. If the disparity does not satisfy the requirement, move steps and direction of a step motor are calculated by utilizing the linear relationship between the disparity change and the move distance of the stage. The iteration will be continued until the disparity of the captured stereomicroscopic image approximates to the clearest disparity. The experimental results show that the proposed method only requires a few iterations and less time to reach the focus position, and the disparity error is less than 0.5 pixel.
Źródło:
Optica Applicata; 2016, 46, 4; 651-663
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High drilling methane drainage in fracturing zones formed by water injection into boreholes
Odprowadzania metanu metodą odwiertów dokonywanych w strefie szczelin powstałych wskutek wprowadzania wody do otworów
Autorzy:
Wang, G.
Huang, W.
Sun, L.
Wu, M.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/220166.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odwierty
odprowadzenie metanu
wtrysk wody
szczelinowanie
odkształcenia
high drilling
methane drainage
water injection
fracturing zones
strain
Opis:
Methane drainage method should be used before coal mining of many modern collieries because venti lation air methane is in sufficient to keep methane level within regulation values. The technology of high drilling methane drainage (HDMD) has been used for methane drainage although its effect is not very stable due to parameter design. The height of the fracturing zones is determined mostly according to empirical formula, on-site observation and numerical simulation analysis. In this paper, a method was introduced for determining the height of the air f ract uring zones (AFZs) based on its high similarity to the characteristics of Fracturing zones and the relationship between the height of Fracturing zones and the strain of overl ying rock strata. The application of water injection in both Shuangdingshan and Dongrong collieries found that the theoretically calculated the height of the Fracturing zones was approximately equal to the measured one in field tests within a permissible error of less than 5%, proving that the method is feasible. Based on the designed drainage parameters, the u tilization of HDMD technology in the collieries mentioned above found that the methane concentrations in both tail gate and upper corner were controlled in the ranges of 0.17% to 0.32% and 0.26% to 0.84%, respectively. These results showed that the water injection verified HDMD in Fracturing zones could effectively solve the problem of metha ne overrun and also verified the accuracy and reliability of its related theory.
Przed rozpoczęciem wydobycia węgla w wielu obecnie eksploatowanych kopalniach wskazane jest odprowadzenie metanu, ponieważ stosowane systemy wentylacji powietrza są niewystarczające aby utrzymać stężenia metanu na dopuszczalnym poziomie. Technologia odprowadzania metanu metodą odwiertów prowadzonych na różnej wysokości (HDMD) wykorzystywana jest w tym celu, choć jej wyniki nie zawsze są stabilne ze względu na konieczność doboru parametrów obliczeniowych. Wysokość strefy szczelinowania określa się zazwyczaj empirycznie, na podstawie obserwacji w terenie oraz drogą symulacji numerycznych. W pracy tej określono wysokość strefy wykonania szczelin w oparciu o podobieństwo do charakterystyk Strefy szczelinowania oraz o analizę odkształceń warstw nadkładu. Zastosowano wtrysk wody w kopalniach Shuangdingshan i Dongrong i stwierdzono, że teoretycznie obliczona wysokość stref szczelinowania była w przybliżeniu równa wysokości zmierzonej empirycznie w trakcie badań terenowych, z dopuszczalnym poziomem błędu poniżej 5%, co wskazuje na możliwość zastosowania metody. W oparciu o parametry obliczeniowe stwierdzono, że zastosowanie metody HDMD w wyżej wymienionych kopalniach spowodowało, że stężenia metanu rejestrowane w chodniku nadścianowym i górnych narożach utrzymywały się odpowiednio na poziomie 0.17%, 0.32% i 0.26%-0.84%. Wyniki te pokazują, że wtrysk wody w strefie szczelin pomaga skutecznie rozwiązać problem obecności zbyt wysokich ilości metanu, ponadto potwierdza dokładność i wiarygodność teorii na której metoda jest oparta.
Źródło:
Archives of Mining Sciences; 2016, 61, 1; 137-156
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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