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Wyszukujesz frazę "Xiong, H." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
An efficient provably secure certificateless aggregate signature applicable to mobile computation
Autorzy:
Xiong, H.
Wu, Q.
Chen, Z.
Powiązania:
https://bibliotekanauki.pl/articles/206221.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
message authentication
certificateless cryptography
aggregate signature
mobile computing
Opis:
An aggregate signature scheme allows a public algorithm to aggregate n signatures on n distinct messages from n signers into a single signature. By validating the single resulting signature, one can be convinced that the messages have been endorsed by all the signers. Certificateless aggregate signatures allow the signers to authenticate messages without suffering from the complex certificate management in the traditional public key cryptography or the key escrow problem in identity-based cryptography. In this paper, we present a new efficient certificateless aggregate signature scheme. Compared with up-to-date certificateless aggregate signatures, our scheme is equipped with a number of attracting features: (1) it is shown to be secure under the standard computational Diffie-Hellman assumption in the random oracle model; (2) the security is proven in the strongest security model so far; (3) the signers do not need to be synchronized; and (4) its performance is comparable to the most efficient up-to-date schemes. These features are desirable in a mobile networking and computing environment where the storage/ computation capacity of the end devices are limited, and due to the wireless connection and distributed feature, the computing devices are easy to be attacked and hard to be synchronized.
Źródło:
Control and Cybernetics; 2012, 41, 2; 373-391
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation on mining effects of upper coal seam on lower coal seam of splitting area of splitting and merging coal seam
Symulacja numeryczna efektów wydobywania węgla w górnym pokładzie węgla na dolny pokład węgla na obszarze rozszczepienia w pokładzie o cechach rozszczepienia i scalania
Autorzy:
Zha, W. H.
Hua, X. Z.
Xiong, L. J.
Huang, R.
Powiązania:
https://bibliotekanauki.pl/articles/348696.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rozszczepienie i scalanie
naprężenia stropu
prawo pęknięć
symulacja numeryczna
splitting and merging
floor stress
failure law
numerical simulations
Opis:
The main mining coal seams 71 and 72 of Huaibei mine area show a relation between splitting and merging. Under the slicing mining circumstance of the splitting area, it is the key problem to face the mining area to ensure the safety of the lower 72 coal mining. Based on face 7225 of Xutuan Coal Mine the influence of 71 coal seam mining on the coal seam 72 was analyzed by the FLAC3D. The law of stress propagation in the floor, failure extent and movement during the mining of coal seam 71 and coal seam 72 were studied by the numerical simulation; it provides the basis for roof management and support selection of 72 coal seam mining.
Główne pokłady węglowe nr 71 i 72 kopalni Huaibei wykazują cechy zarówno rozszczepienia, jak i scalania. Podczas wybierania warstwowego na obszarze rozszczepienia głównym problemem jest zapewnienie bezpieczeństwa dolnego pokładu nr 72. Na przykładzie przodka 7225 kopalni Xutuan przeanalizowano wpływ wydobycia w pokładzie nr 71 na pokład nr 72 przy użyciu programu FLAC3D. Propagację fal naprężeń w spągu, zakres pęknięcia i przesunięcia podczas wybierania pokładu węgla nr 71 i 72 zbadano za pomocą symulacji numerycznej, co daje podstawy do lepszej kontroli stropu i do wyboru obudowy pod wybieranie pokładu węgla nr 72.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 3; 471-479
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Expansion of Explosive Molecular Crystals: Anisotropy and Molecular Stacking
Autorzy:
Qian, W.
Zhang, C.
Xiong, Y.
Zong, H.
Zhang, W.
Shu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/358262.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic material
anisotropic thermal expansion
molecular stacking
molecular dynamics simulation
density functional theory method
Opis:
Molecular dynamics simulations of three typical explosive crystals, octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), 1,1-diamino-2,2- dinitroethene (FOX-7) and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), were carried out under NPT ensemble and selected force field. The equilibrium structures at elevated temperatures were obtained, which show that the stacking behaviour of the molecules does not change with temperature. The coefficient of thermal expansion (CTE) values were calculated by linear fitting methods, and the results show that the CTE values are close to the experimental results and are anisotropic. The total energies of the cells expanding along each single crystallographic axis were calculated by the periodic density functional theory method, indicating that the energy change rates are anisotropic, and correlation equations of the energy change vs. CTE values were established. The essence of the anisotropy of the explosive crystal’s thermal expansion was compared and elucidated.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 59-81
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Power Density on Diffusion Length and Energy Gap of a-Si:H and nc-Si:H Thin Films Prepared by PECVD Technique
Autorzy:
Badran, R.
Al-Amodi, H.
Yaghmour, S.
Shaklan, S.
Bruggemann, R.
Han, X.
Xiong, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419002.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
78.20.Ci
73.61.Jc
78.30.Ly
Opis:
The increase in power density of 0.3, 0.5, 0.6, and 0.7 W $cm^{-2}$ for hydrogenated amorphous and nanocrystalline silicon (a-Si:H and nc-Si:H) thin film samples prepared by plasma enhanced chemical vapor deposition technique causes an increase in crystalline volume fraction when the silane concentration is fixed. This increase in crystalline volume fraction is correlated to the absorption coefficient and refractive index which are determined from ellipsometric measurements. The crystallinity of samples is studied by both Raman and X-ray diffraction techniques. A mild change in the optical energy gap around an average value of 1.8 eV is noticed due to the observed change in the degree of crystallinity of the samples when power density increases. Moreover, the ambipolar diffusion length measured by the steady-state photocarrier grating technique is found to change with the increase in power density. The values of some obtained optical parameters are compared to a standard crystalline sample.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 576-580
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical study of the uniaxial compressive stress-strain relationship of a rock mass with two parallel joints
Autorzy:
Xiong, L. X.
Yuan, H. Y.
Zhang, Y.
Zhang, K. F.
Li, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/231076.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
masa skalna łączona
złącze równoległe
siła szczytowa
jointed rock mass
parallel joint
peak strength
Opis:
A “rock bridge”, defined as the closest distance between two joints in a rock mass, is an important feature affecting the jointed rock mass strength. Artificial jointed rock specimens with two parallel joint fractures were tested under uniaxial compression and numerical simulations were carried out to study the effects of the inclination of the rock bridge, the dip angle of the joint, rock bridge length, and the length of joints on the strength of the jointed rock mass. Research results show: (1) When the length of the joint fracture, the length of the rock bridge, and the inclination of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually increases as the inclination of the joint fracture increases from 0° to 90°. (2) When the length of the joint fracture, the length of the rock bridge, and the inclination of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen shows variations in trends with the inclination of the rock bridge increasing from 30° to 150° (3). In the case when the joint is angled from the vertical loading direction, when the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually decreases with an increasing length of joint fracture. When the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen does not show a clear trend with an increase of the length of the rock bridge.
Źródło:
Archives of Civil Engineering; 2019, 65, 2; 67-80
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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