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Tytuł:
Improved Photovoltaic Properties Of Dye-Sensitized Solar Cells Using Laser Patterned F-Doped SnO2 Thin Films
Poprawa właściwości fotowoltaicznych ogniw słonecznych uczulonych barwnikiem przez laserową modyfikację powierzchni cienkich warstw SnO2
Autorzy:
An, H.-R.
An, H.
Riu, D.-H.
Ahn, H. J.
Tematy:
dye-sensitized solar cells
F-doped SnO2 thin films
surface morphology
laser patterning
fotowoltaniczne ogniwa słoneczne
cienkie warstwy SnO2
morfologia powierzchni
modyfikacja laserowa
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/353636.pdf  Link otwiera się w nowym oknie
Opis:
We modified the surfaces of F-doped SnO2 thin films using laser patterning to improve the photovoltaic properties of dye-sensitized solar cells. To do so, we varied the laser power density and the distance between laser-patterned lines. First, we investigated three power densities. Higher densities led to higher sheet resistances owing to increases in surface roughnesses. The lowest power density increased surface roughness without electrical degradation. Next, we explored three line spacings at a fixed power density. The films with the narrowest spacing exhibited the highest power conversion efficiency (~7.00%), the highest short-circuit photocurrent density (16.28 mA/cm2), and a good fill factor (58.82%).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of compressive failure of concrete under static and dynamic loads
Autorzy:
Liu, L.
An, H. M.
Tematy:
beton
wytrzymałość na ściskanie jednoosiowe
dynamiczne ładowanie
szybkość odkształcania
pęknięcie
fragmentacja
concrete
uniaxial compressive strength
dynamic load
strain rate
fracture
fragmentation
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/230225.pdf  Link otwiera się w nowym oknie
Opis:
The fracture and fragmentation of concrete under static and dynamic loads are studied. The uniaxial compressive strength test is employed to study the concrete behavior under static loads while the split Hopkinson pressure bar is used to study the dynamic behavior of the concrete under static loads. The theories for acquiring the stress, strain and strain rate of the concrete in the dynamic test by Hopkinson pressure bar has been introduced. The fracture patterns of the concrete in the uniaxial compressive test have been obtained and the static concrete compressive strengths have been calculated. The fracture patterns of the concrete in the uniaxial compressive test have been obtained and the static concrete compressive strengths have been calculated. The fracture and fragmentation of the specimen under dynamic loads have been acquired and the stress-strain curves of concrete under various impact loads are obtained. The stress-strain curve indicates a typical brittle material failure process which includes existing micro-fracture closure stage, linear-elastic stage, nonlinear-elastic stage, and post-failure stages. The influence of the loading rate for the compressive strength of the concrete has compared. Compared with the concrete under static loads, the dynamic loads can produce more fractures and fragments. The concrete strength is influenced by the strain rate and the strength increases almost linearly with the increase of the strain rate.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of dynamic behaviors of concrete under various strain rates
Autorzy:
An, H. M.
Liu, L.
Tematy:
zachowanie dynamiczne
beton
model Holmquist-Johnson-Cook
HJC
pasek ciśnienia Hopkinsona rozdzielony
SHPB
pęknięcie
podział
dynamic behavior
concrete
Holmquist-Johnson-Cook model
split Hopkinson pressure bar
fracture
fragmentation
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/230844.pdf  Link otwiera się w nowym oknie
Opis:
As the dynamic behavior of the concrete is different from that under static load, this research focuses on the study of dynamic responses of concrete by simulating the split Hopkinson pressure bar (SHPB) test. Finite element code LS-DYNA is used for modeling the dynamic behaviors of concrete. Three continuous models are reviewed and the Holmquist-Johnson-Cook model (HJC) is introduced in detail. The HJC model which has been implemented in LS-DYNA is used to represent the concrete properties. The SHPB test model is established and a few stress waves are applied to the incident bar to simulate the dynamic concrete behaviors. The stress-strain curves are obtained. The stress distributions are analyzed. The crack initiation and propagation process are described. It is concluded that: the HJC model can modeling the entire process of the fracture initiation and fragmentation; the compressive of the concrete is significantly influenced by the strain rates.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and application of mechanical system reliability model based on copula function
Autorzy:
An, H.
Yin, H.
He, F.
Tematy:
copula function
mechanical system reliability
model
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Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/260570.pdf  Link otwiera się w nowym oknie
Opis:
There is complicated correlations in mechanical system. By using the advantages of copula function to solve the related issues, this paper proposes the mechanical system reliability model based on copula function. And makes a detailed research for the serial and parallel mechanical system model and gets their reliability function respectively. Finally, the application research is carried out for serial mechanical system reliability model to prove its validity by example. Using Copula theory to make mechanical system reliability modeling and its expectation, studying the distribution of the random variables (marginal distribution) of the mechanical product’ life and associated structure of variables separately, can reduce the difficulty of multivariate probabilistic modeling and analysis to make the modeling and analysis process more clearly.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of positive elevation effect and prediction of vibration velocity of bench blasting vibration
Autorzy:
Zhang, X. J.
An, H. M.
Tematy:
drgania wybuchowe
efekt podniesienia pozytywny
formuła kroku
strzał
kopalnia
blasting vibration
positive elevation effect
step formula
mine
blasting
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/1853676.pdf  Link otwiera się w nowym oknie
Opis:
Accurate prediction of blasting vibration should be achieved in mine blasting production practice. It is also a critical problem in the field of blasting vibration control technology research. In this research paper, on the basis of the previous research results and taking account into the reflection principle of elastic wave at the free interface, the authours proposes the blasting seismic wave propagation model. In addition, the blasting positive elevation effect are theoretically explained in detail, and the vibration velocity prediction formula of the positive elevation effect is derived. Finally, the positive elevation effect mechanism and the step (positive) formula are calibrated based on the on-site monitoring data of blasting vibration of Qipanjing Jinou coal mine. In beirf, a theoretical basis is laid by this paper for similar blasting projects.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Yield surfaces for thin shells accounting for transverse shear
Autorzy:
Sherbourne, A.N.
Haydl, H.M.
Wydawca:
Polish Scientific Publishers IFTR
Powiązania:
Archives of Mechanics
Opis:
Od Vol. 53, issue 4/5 (2001) wyd: PAS. IFTR
Od Vol. 43, issue 1 (1991) wyd.: Polish Scientific Publishers = PWN
Od Vol. 50, issue 4 (1998) wyd.: Agencja Reklamowo-Wydawnicza A. Grzegorczyk
573-716 stron ; 24 cm
573-716 pages ; 24 cm
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
Training safely, Training safety
Autorzy:
Wu, J.
An, M.
Jin, Y.
Geng, H.
Tematy:
safety at sea
Training of Crew
Maritime Education and Training (MET)
Training Safety
Maritime Safety Education
Marine Survival
SOLAS Convention
Self Protection
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Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:
https://bibliotekanauki.pl/articles/116104.pdf  Link otwiera się w nowym oknie
Opis:
It is the basic requirement of maritime safety education to guarantee the safety of teaching operation while training the crew's occupation safety capability. Marine Training Center of Shanghai Maritime University has undertaken the practical teaching of "marine survival" for many years and come up with the whole safety procedures of training. Based on the requirements of SOLAS convention and regulations of STCW over crew training, this paper introduces the safety allocation, utilization and maintenance of teaching equipments. Through the investigation of the safety situation of students' practical operation, the safety teaching method named "four in one" has been put forward, which includes the pre-teaching safety precaution, the whole monitor during the teaching process, the post-teaching summary evaluation, and the reset and standby of teaching facilities. Finally, during the learning and training of "marine survival", crews and students are called on to place priority on personal safety rather than acquisition of knowledge and skills. Only in this way can they be capable of self-protection and protection of others in the career of seafaring.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the rheological properties of CL-20/HTPB casting explosives
Autorzy:
Li, H.-X..
Wang, J-Y.
An, C.-W.
Tematy:
casting explosive
particle gradation
rheological properties
plasticizer
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Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:
https://bibliotekanauki.pl/articles/358310.pdf  Link otwiera się w nowym oknie
Opis:
The rheological properties of ε-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12hexaazaisowurtzitane (CL-20)/hydroxy-terminated polybutadiene (HTPB) casting explosives with different formulations were tested and analyzed. The effects of both the weight percentage (wt.%) of CL-20 and its particle size, as well as the type and content of plasticizers, on the rheological properties of CL-20/HTPB casting explosives were investigated in detail. The results show that the viscosity and pseudoplasticity of CL-20/HTPB casting explosives increase with increasing wt.% of CL-20 and decreasing particle size. The gradation of CL-20 particle size also affects the rheological properties of the casting explosives. When the mixing ratio of 30 μm to 2 μm particles is 3:1, the viscosity reaches its lowest value and the non-Newtonian index reaches the maximum value of 0.5698. The viscosity, non-Newtonian index and impact sensitivity of the samples studied are clearly decreased by the addition of dioctyl adipate (DOA), dioctyl sebacate (DOS) or dibutyl phthalate (DBP). However, the three plasticizers do not appear to affect the thermal decomposition of CL-20/HTPB casting explosives. With respect to the rheological properties, mechanical properties and sensitivity, DOA is the optimum plasticizer to use in CL-20/HTPB casting explosives.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 110

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