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Wyświetlanie 1-15 z 24
Tytuł:
Initiation Capacity of a New Booster Pellet
Autorzy:
Hua, L.
Hu, S.
Cao, X.
Powiązania:
https://bibliotekanauki.pl/articles/358063.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
explosion mechanics
booster pellet
main charge
initiation capacity
Opis:
Insensitive munitions improve the survivability of both weapons and their associated platforms. All weapon systems contain an explosive train which needs to meet the insensitive munitions criteria but also to reliably initiate the main charge explosive. The traditional cylindrical booster pellet has insufficient energy output to reliably initiate an insensitive main charge explosive. To ensure that this requirement can be achieved, a new highly effective booster charge structure was designed. New booster pellets of four different sizes were investigated by numerical simulation and the one with the most powerful output was selected for experimental study. The results show that the new booster pellet has more initiation capacity than a cylindrical booster pellet with the same mass and pressed density. The convergence pressure of the new booster pellet is much higher than that of a cylindrical booster pellet with the same density.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 157-170
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Initiation Capacities of Two Booster Pellets
Autorzy:
Hu, L.
Hu, S.
Cao, X.
Powiązania:
https://bibliotekanauki.pl/articles/358172.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
explosion mechanics
booster
pellet
synchronous explosive circuit
initiation capacity
main charge
Opis:
The appearance of insensitive main charges has created new requirements in the booster pellets of the detonation train, specifically, the output of the booster pellet must be strong enough to initiate the insensitive main charge. Traditional cylindrical booster pellets have great difficulty in meeting the demands of the insensitive main charge for reliable detonation. A four-point-synchronous explosive circuit and an eight-point-synchronous explosive circuit were designed to initiate two booster pellets, designed on the basis of shock initiation theory and effective charge theory, as well as the shaped charge effect theory. The results show that booster pellet 1 and booster pellet 2, under multi-point-synchronous explosive circuits, can initiate standard main charge pellets with less explosive mass than an ordinary cylindrical booster pellet. The initiation capacity of booster pellet 2 is better than that of booster pellet 1.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 3; 261-272
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene
Autorzy:
Gao, Y
Zheng, W.
Cao, X.
Chen, S.
Powiązania:
https://bibliotekanauki.pl/articles/148296.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
purex process
TBP solvent
alpha radiolysis
gamma radiolysis
Pu retention
Opis:
In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.
Źródło:
Nukleonika; 2014, 59, 4; 123-128
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Initiation Capacities of Conical Ring Booster Pellets
Autorzy:
Hu, L.
Hu, S.
Cao, X.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358594.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
booster pellet
main charge
initiation capacity
numerical simulation
optimization
Opis:
The insensitive main charge explosive is becoming an important part of modern weapon development. Insensitive main charge explosives generally have a high critical initiation pressure. The detonation pressure of a traditional cylindrical booster pellet is constant at a specific density and consequently has insufficient energy output to reliably initiate an insensitive main charge explosive. To ensure that this requirement could be achieved, the conical ring booster pellet was designed and optimized. Eight-point-synchronous explosive circuits were designed as appropriate to the sizes of the four booster pellets. The initiation processes of the four conical booster pellets equipped with the eight-point circuit were simulated using ANSYS/LY-DYNA software. The experimental measurements were performed in order to test the initiation capacities of these conical booster pellets. The results demonstrated that their initiation capacities are much better than the initiation capacity of a cylindrical booster pellet. The optimum size of the conical ring booster pellet is when the ratio of the inner to the upper diameter is 0.52, the ratio of the inner to the lower diameter is 0.44, and the ratio of the height to the lower diameter is 0.50.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 3; 335-348
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and experimental investigation of a controllable rotary fluid damper
Autorzy:
Cao, X.
Zhou, J.
Yu, M.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/38697102.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
controllable damper
rotary damper
parametric modeling
sensitivity analysis
damper design
Opis:
Controllable rotary fluid damper (CRFD) is an efficient and cheap energy dissipation device, which is used to reduce the impact of vibration in mechanical systems. In this paper, the CRFD controlled by a servo motor is developed to reduce the effects of vibrations in the helicopter flight control system. The dynamic mechanical characteristic of the CRFD is experimentally investigated by the MTS machine. Due to the complex factors such as high shear thinning rate and compressibility of the damping medium, inertia of moving parts and internal friction, the CRFD studied has highly nonlinear hysteresis characteristics. The accuracy of the damper modeling is of great significance for designing effective vibration reduction methods. Therefore, a new generalized viscous–nonlinear elastic model is proposed to track the mechanical characteristics of CRFD. On the basis of parameter sensitivity analysis, the proposed generalized viscous–nonlinear elastic model is modified. According to the identification results of the modified model, the main parameters are fitted as polynomial functions of motor rotation angle. Through error analysis between analytical torques and experimental torques, it is concluded that the modified generalized viscous–nonlinear elastic model has the smallest error compared with Kwok and Maxwell models, which indicates that the proposed modified model can accurately describe the mechanical characteristics of the CRFD under different working conditions.
Źródło:
Archives of Mechanics; 2023, 75, 4; 493-516
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecast model for real time reliability of storage system based on periodic inspection and maintenance data
Model do prognozowania niezawodności systemu magazynowania w czasie rzeczywistym w oparciu o dane z przeglądów okresowych oraz dane eksploatacyjne
Autorzy:
Su, Ch.
Zhang, Y. J.
Cao, B. X.
Powiązania:
https://bibliotekanauki.pl/articles/301915.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
niezawodność magazynowania
niezawodność w czasie rzeczywistym
okresowe przeglądy i obsługa
dane cenzurowane
storage reliability
real-time reliability
periodic inspection and maintenance
censored data
Opis:
In recent years, storage reliability has attracted much attention for increasing reliability requirement. In this paper, forecast models for real-time reliability of storage system under periodic inspection and maintenance are presented, which is based on the theories of reliability physics and exponential distribution. The models are developed under two newly-defined imperfect repair modes, i.e., Improved As Bad As Old (I-ABAO) and Improved As Good As New (I-AGAN). A completion method for censored life data is also proposed by averaging the residual lifetime. According to the complete and censored lifetime data, parameters in the models are estimated by applying maximum likelihood estimation method and iterative method respectively. A numerical example of a storage system is given to verify the feasibility of the proposed completion method and the effectiveness of the two models.
W ostatnich latach wiele uwagi poświęcono tematyce niezawodności magazynowania w odniesieniu do zwiększania wymogu niezawodności. W prezentowanym artykule, przedstawiono modele do prognozowania w czasie rzeczywistym niezawodności systemu magazynowania podlegającego przeglądom okresowym i obsłudze. Modele oparto na teoriach z zakresu fizyki niezawodności oraz na rozkładzie wykładniczym. Proponowane modele opracowano dla dwóch nowo zdefiniowanych opcji niepełnej odnowy, t.j. Improved-As Bad As Old (Jak Tuż Przed Uszkodzeniem - Wersja Udoskonalona) oraz Improved-As Good As New (Jak Fabrycznie Nowy - Wersja Udoskonalona). Zaproponowano także metodę uzupełniania danych cenzurowanych (uciętych) dotyczących trwałości polegającą na uśrednianiu trwałości resztkowej. Zgodnie z pełnymi i cenzurowanymi danymi trwałościowymi, parametry w proponowanych modelach ocenia się, odpowiednio, z zastosowaniem estymacji metodą największej wiarygodności oraz metody iteracyjnej. Poprawność przedstawionej metody uzupełniania oraz efektywność proponowanych dwóch modeli zweryfikowano na podstawie numerycznego przykładu systemu magazynowania.
Źródło:
Eksploatacja i Niezawodność; 2012, 14, 4; 342-348
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colloidal crystal cladded microfiber for refractive index sensing
Autorzy:
Yan, H. T.
Zhao, X Y
Zhang, Ch.
Zhen, Z Q
Li, Q Z
Cao, J X
Xia, L X
Powiązania:
https://bibliotekanauki.pl/articles/174902.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microfibers
colloidal crystals
refractive index sensing
Opis:
We investigate the evanescent field of a microfiber wrapped by colloidal crystals. The microfiber has the diameter of about 1 μm that is drawn from a single-mode fiber with an alcohol lamp. The colloidal spheres are further attached to the microfiber through thermal evaporation, then they self-assemble to crystal-like structures. The 400 nm, 590 nm, and 710 nm-diameter SiO2 colloidal spheres are used, respectively. The spectral responses are studied theoretically and experimentally, and the results agree with each other. It is revealed that the evanescent field of a microfiber could be modulated by the photonic band-gap of colloidal crystals. This characteristic is very useful in refractive index sensing for liquids.
Źródło:
Optica Applicata; 2014, 44, 2; 309-315
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspects of red soil properties and water management in China
Autorzy:
Cao, Z.
Zhu, X.
Powiązania:
https://bibliotekanauki.pl/articles/24946.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
evaporation
soil structure
soil water
physical property
water management
China
soil property
rainfall
red soil
seasonal draught
Źródło:
International Agrophysics; 1999, 13, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The endomycorrhizal fungal species and their effects on the growth and nutrient characteristics of Eucalyptus maidenii seedlings in China
Autorzy:
Wang, X.
Kong, X.
Zhao, Y.
Cao, Y.
Cao, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2077654.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Eucalyptus maidenii
endomycorrhizal fungi
major species
Opis:
Eucalyptus maidenii plantations are typically fertilized to increase the yields of eucalyptus oil and timber. However, the application of chemical fertilizers is costly and can cause environmental pollution and soil erosion. Mycorrhiza fungi can facilitate the cultivation of optimal seedlings while promoting the growth of trees. To date, investigations into the inoculation of endomycorrhizal fungi to enhance the productivity of E. maidenii in Yunnan, China have not been undertaken. The species/dominant species of endomycorrhizal fungi on E. maidenii in Yunnan were isolated and iden- tified. The effect of endomycorrhizal fungi on E. maidenii was elucidated. The major species of endomycor- rhizal fungi that affect E. maidenii were ascertained. Bulk soil was collected from an E. maidenii plantation, and the species of endomycorrhizal fungi were inves- tigated. The effect of the endomycorrhizal fungi on E. maidenii were analyzed via a single factor experimental design, where the number of spores of endomycorrhizal fungi in the seedling substrate were controlled. The major endomycorrhizal fungi species that affected E. maidenii were ascertained via stepwise regression analysis. Five endomycorrhizal fungal species were isolated from the bulk soil, with the dominant being Glomus ag- gregatum and Glomus mosseae. With higher counts of endomycorrhizal fungal spores in the seedling substrate, the infection rate and intensity of seedlings were observed to increase, as well as the NPK concentrations of the bulk soil. With the increased nitrogen concentration in the bulk soil, the nitrogen concentration of the aerial components of the seedlings also increased. The NPK concentrations in the bulk soil and seedlings, the second order lateral roots, the root activity, and the seedling height were significantly promoted by the presence of endomycorrhizal fungi (the third experimental treatment). The NPK concentrations of the bulk soil and seedlings, as well as the growth indices of seedlings increased through endomycorrhizal fungi inoculation. The major species of the endomycorrhizal fungi on E. maidenii were G. aggregatum, Glomus multicaule, and Claroideoglomus etunicatum.
Źródło:
Dendrobiology; 2020, 83; 68-74
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abnormal phase removing method in phase measuring profilometry
Autorzy:
Xu, X.
Cao, Y.
Chen, C.
Cao, S.
Peng, K.
Powiązania:
https://bibliotekanauki.pl/articles/173504.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
information optics
phase measuring profilometry
phase shifting algorithm
phase error
phase auto-extracting
Opis:
An abnormal phase removing method in phase measuring profilometry is proposed. In the five equal shifting phase steps algorithm, the shifting phase might be extracted from the deformed patterns captured by CCD camera. But there may be some errors introduced by a digital fringe projector and CCD camera in these deformed patterns. The impurity of the deformed patterns may lead to four classes of abnormalities when extracting the shifting phase. These abnormalities may cause the wrong shifting phase extraction by which the reconstructed object might be misshapen or anamorphic, or even in failure. By this proposed method, the above abnormalities can be removed, and the shifting phase can be auto-extracted precisely from the impure deformed patterns without knowing its value. Experimental results verify the feasibility and effectiveness of the proposed method.
Źródło:
Optica Applicata; 2017, 47, 1; 85-95
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of genistein on the gene expressions of androgen generating key enzymes StAR, P450scc and CYP19 in rat ovary
Autorzy:
Chi, X.X.
Chu, X.L.
Zhang, T.
Cao, L.K.
Powiązania:
https://bibliotekanauki.pl/articles/2087521.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
genistein
steroidogenic acute regulatory protein
side-chain cleavage enzymes
cytochrome P450 aromatase
rat ovary
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 279-286
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive robust simultaneous stabilization controller with tuning parameters design for two dissipative Hamiltonian systems
Autorzy:
Cao, Z.
Hou, X.
Zhao, W.
Powiązania:
https://bibliotekanauki.pl/articles/229883.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ARSS control
DHSs
symbolic computation
controller parameterization
tuning parameters
Opis:
This paper investigates the problem of adaptive robust simultaneous stabilization (ARSS) of two dissipative Hamiltonian systems (DHSs), and proposes a number of results on the controller parameterization design. Firstly, an adaptive H∞ control design approach is presented by using the dissipative Hamiltonian structural for the case that there are both external disturbances and parametric uncertainties in two DHSs. Secondly, an algorithm for solving tuning parameters of the controller is proposed using symbolic computation. The proposed controller parameterization method avoids solving Hamilton-Jacobi-Issacs (HJI) equations and the obtained controller is easier as compared to some existing ones. Finally, an illustrative example is presented to show that the ARSS controller obtained in this paper works very well.
Źródło:
Archives of Control Sciences; 2017, 27, 4; 505-525
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)
Autorzy:
Zhang, M.
Xu, X.
Zhu, X.
Jin, X.
Bao, H.
Dugeer, S.
Du, C.
Cao, G.
Yang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2087780.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ghrelin
reindeer (Rangifer tarandus)
cDNA cloning
structural characterization
tissue expression
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 55-64
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
Autorzy:
Wu, X. S.
Cao, J. F.
Chen, Z. J.
Liu, W.
Powiązania:
https://bibliotekanauki.pl/articles/355599.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixed conducting oxides
mechanical properties
domain structure
phase transition
mechanical spectroscopy
internal friction
Opis:
The low-frequency mechanical spectra of lanthanum cobaltite based mixed conducting oxides have been measured using a computer-controlled inverted torsion pendulum. The results indicate that the internal friction spectra and shear modulus depend on the Sr doping contents (x). For undoped samples, no internal friction peak is observed. However, for La0.8Sr0.2CoO3-δ, three internal friction peaks (P2, P3 and P4) are observed. In addition to these peaks, two more peaks (P0 and P1) are observed in La0.6Sr0.4CoO3‒δ. The P0 and P1 peaks show characteristics of a phase transition, while the P2, P3 and P4 peaks are of relaxation-type. Our analysis suggests that the P0 peak is due to a phase separation and the P1 peak is related to the ferromagnetic–paramagnetic phase transition. The P2, P3 and P4 peaks are associated with the motion of domain walls. The formation of this kind of domain structure is a consequence of a transformation from the paraelastic cubic phase to the ferroelastic rhombohedral phase. With partial substitution of Fe for Co, only one peak is observed, which is discussed as a result of different microstructure.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1733-1738
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
n-sided polygonal hybrid finite elements involving element boundary integrals only for anisotropic thermal analysis
Autorzy:
Cao, R. F.
Zhao, X. J.
Lin, W. Q.
Wang, H.
Powiązania:
https://bibliotekanauki.pl/articles/38597074.pdf
Data publikacji:
2020
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
hybrid finite element
polygon
non-conforming mesh
fundamental solution
anisotropic material
heat conduction
Opis:
As a combination of the traditional finite element method and boundary element method, the n-sided polygonal hybrid finite element method with fundamental solution kernels, named as HFS-FEM, is thoroughly studied in this work for two-dimensional heat conduction in fully anisotropic media. In this approach, the unknown temperature field within the polygon is represented by the linear combination of anisotropic fundamental solutions of problem to achieve the local satisfaction of the related governing equations, but not the specific boundary conditions and the continuity conditions across the element boundary. To tackle such a shortcoming, the frame temperature field is independently defined on the entire boundary of the polygonal element by means of the conventional one-dimensional shape function interpolation. Subsequently, by the hybrid functional with the assumed intra- and inter-element temperature fields, the stiffness equation can be obtained including the line integrals along the element boundary only, whose dimension is reduced by one compared to the domain integrals in the traditional finite elements. This means that the higher computing efficiency is expected. Moreover, any shaped polygonal elements can be constructed in a unified form with the same fundamental solution kernels, including convex and non-convex polygonal elements, to provide greater flexibility in meshing effort for complex geometries. Besides, the element boundary integrals endow the method higher versatility with a non-conforming mesh in the pre-processing stage of the analysis over the traditional FEM. No modification to the HFS-FEM formulation is needed for the non-conforming mesh and the element containing hanging nodes is treated normally as the one with more nodes. Finally, the accuracy, convergence, computing efficiency, stability of non-convex element, and straightforward treatment of non-conforming discretization are discussed for the present n-sided polygonal hybrid finite elements by a few applications in the context of anisotropic heat conduction.
Źródło:
Archives of Mechanics; 2020, 72, 2; 109-137
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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