Wszystkie pola: Dai, H. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Research on the Extrinsic Fabry-Perot Interference (EFPI) technology for optical fiber sensing technology of mine gas
Technologia EFPI wykrywania obecności gazów przy pomocy specjalnych włókien
Autorzy:: Zhou, M. R.
Dai, H.
Ling, D. Y.
Ye, Y. L.
Powiązania:: https://bibliotekanauki.pl/articles/348694.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: EFPI
gaz kopalniany
czujniki z włóknami optycznymi
mine gas
fiber optical sensors
Opis:: Along with the expansion of the mining capacity, the mine gas accident is more and more. There are still many shortages and defects in gas monitoring system in the previous gas concentration monitoring method. Therefore, we propose the optical fiber sensing technology of mine gas method based on Extrinsic Fabry-Perot Interferometer (EFPI) technology. According to the analysis of interference spectrum from EFPI fiber optic sensor, the varying information is obtained. Then the concentration of the gas is calculated, by Beer Law and the relations between light intensity and concentration of gas. The method implements the high resolution of optical fiber sensing, and avoids the light interference and so on. This method, which can eliminate all kinds of interference in monitoring gas concentration, is a new method on measuring the concentration of gas at harsh environments under coal mine. It has extremely high security and strong anti-interference capability. The method works well in inflammable and explosive environment, which has an important significance for safety production in the coal.
Wraz z rozwojem górnictwa w górnictwie występuje coraz więcej wypadków. Obserwuje się wciąż brak lub wadliwe działanie systemów monitorujących zawartość gazów w kopalniach. Dlatego autorzy niniejszej pracy zaproponowali technologię wykrywania obecności gazów przy pomocy specjalnych włókien przy pomocy interferometru Fabry-Perot'a EFPI. Koncentrację gazów oblicza się przy pomocy prawa Beer'a, z zależności pomiędzy intensywnością światła w czujniku optycznym, a stężeniem gazu. Metoda ta pozwala na wdrożenie do górnictwa metod wykrywania gazów przy wykorzystaniu włókien optycznych, wykluczając jednocześnie zjawisko interferencji świetlnej i temu podobnych. Metoda ta, eliminuje wszelkiego rodzaju interferencję w monitorowaniu stężenia gazów jest nowatorską metodą pomiaru stężenia gazów w kopalniach podziemnych. Metoda ta również zapewnia bezpieczeństwo. Metoda ta sprawdza się zarówno w środowisku gdzie nie ma zagrożenia gazowego, jak również w środowisku gdzie mogą wystąpić gazy wybuchowe, co jest bardzo ważne dla zapewnienia bezpieczeństwa pracy przy produkcji węgla.
Źródło:: AGH Journal of Mining and Geoengineering; 2012, 36, 3; 501-507
1732-6702
Pojawia się w:: AGH Journal of Mining and Geoengineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Defect Recovery in α-Fe e$\text{}^{-}$-irradiated at 300 K
Autorzy:: Dai, G. H.
Li, X. H.
Moser, P.
Moya, G.
Van Duysen, J. C.
Powiązania:: https://bibliotekanauki.pl/articles/1928989.pdf
Data publikacji:: 1993-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.70.Bv
61.80.Fe
78.70.Bj
Opis:: Defect annealing recovery has been studied, by measuring positron lifetime spectra, in high-purity α-iron irradiated at 300 K with 3 MeV electrons to a fluency of 7 × 10$\text{}^{19}$ cm$\text{}^{-2}$. Vacancy clusters containing 6-10 single vacancies were observed immediately after irradiation during which they were possibly forming (the so-called "irradiation annealing"). With increasing temperature, the agglomerates continually grow in size at the expense of their concentration, giving rise to the formation of microvoids (> 15 vacancies). Also present were other types of defects, probably immobile vacancies trapped by impurity (e.g. carbon) atoms and dislocation/loops generated presumably from collapse of voids during the relatively high dose irradiation and/or the annealing. The immobile vacancies eventually became movable at around 350 K, supplying the growing clusters and thus leading to a stabilization in their concentration till around 500 K. Between 500 and 700 K, microvoids gradually evaporated, but the dislocation-associated defects were able to survive annealing at temperatures as high as 700 K. The void size and concentration and their evolution have been evaluated on the basis of both the to date theoretical and experimental studies. The temperature dependence was also, observed of positron trapping into vacancy agglomerates of various sizes.Za
Źródło:: Acta Physica Polonica A; 1993, 83, 3; 277-286
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Use of fluorescence quantitative polymerase chain reaction (PCR) for the detection of Escherichia coli adhesion to pig intestinal epithelial cells
Autorzy:: Dai, C.H.
Gan, L.N.
Qin, W.U.
Zi, C.
Zhu, G.Q.
Wu, S.L.
Bao, W.B.
Powiązania:: https://bibliotekanauki.pl/articles/31510.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: An efficient and accurate method to test Escherichia coli (E. coli) adhesion to intestinal epithelial cells will contribute to the study of bacterial pathogenesis and the function of genes that encode receptors related to adhesion. This study used the quantitative real-time polymerase chain reaction (qPCR) method. qPCR primers were designed from the PILIN gene of E. coli F18ab, F18ac, and K88ac, and the pig β-ACTIN gene. Total deoxyribonucleic acid (DNA) from E. coli and intestinal epithelial cells (IPEC-J2 cells) were used as templates for qPCR. The 2−ΔΔCt formula was used to calculate the relative number of bacteria in cultures of different areas. We found that the relative numbers of F18ab, F18ac, and K88ac that adhered to IPEC-J2 cells did not differ significantly in 6-, 12-, and 24-well culture plates. This finding indicated that there was no relationship between the relative adhesion number of E. coli and the area of cells, so the method of qPCR could accurately test the relative number of E. coli. This study provided a convenient and reliable testing method for experiments involving E. coli adhesion, and also provided innovative ideas for similar detection methods.
Źródło:: Polish Journal of Veterinary Sciences; 2016, 19, 3
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study on a novel hydroxamic acid as the collector of rhodochrosite
Autorzy:: Zhao, G.
Dai, T.
Wang, S.
Zhong, H.
Powiązania:: https://bibliotekanauki.pl/articles/110816.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: flotation
rhodochrosite
hydroxamic acid
DFT
Opis:: A novel collector, tert-butyl benzohydroxamic acid (TBHA), was first introduced in rhodochrosite flotation. The performance of TBHA was investigated by the density functional theory (DFT) calculation along with the micro flotation test, zeta potential determination and XPS analysis, compared with benzohydroxamic acid (BHA). TBHA has stronger affinity to the mineral than BHA in terms of frontier molecular orbital, atomic net charge and bond population. The substitution of tert-butyl group on the benzene ring improves the affinity of the hydroxamic acid to the mineral. TBHA exhibits excellent collecting ability to rhodochrosite with a recovery of about 99% at a concentration of 3.89×10-4 mol/dm3 and pH 6.5. The hydroxamic acid molecules are adhered on mineral surfaces by chemical adsorption, resulting in negative shifts for the zeta potential of rhodochrosite with the presence of the collector. Chemical adsorption can be also confirmed from XPS analyses that the atomic concentration ratios of C and O to Mn on the treated mineral surfaces were increased and the binding energy of Mn3s was decreased. The experimental data achieve excellent agreement with the computational analyses.
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 2; 428-439
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A comparison of objective functions of optimization-based smoothing algorithm for tetrahedral mesh improvement
Autorzy:: Dai, C.
Liu, H.-L.
Dong, L.
Powiązania:: https://bibliotekanauki.pl/articles/279637.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: objective function
mesh quality metric
optimization-based smoothing
mesh quality improvement
mesh generation
Opis:: The objective function based on mesh quality metric has a major impact on smoothing unstructured tetrahedral meshes. The ability of seven mesh quality metrics to distinguish four kinds of poor-quality elements and their effects on the change of element shape are analyzed in detail. Then, four better mesh quality metrics are chosen to construct objective functions. In addition, the rational determination of searching direction and the optimal step size in the optimization algorithm of solving the objective function are proposed. Finally, comparisons with the other three objective functions are made according to different number of elements, iteration limit, and the desired accuracy in the improved mesh. It is found that with the increase of the number of elements, the time consumed during optimization increases, but the changes of the worst quality element are different. The number of iterations has little effect on the mesh quality and the time cost. The increasing of the desired degree of accuracy will improve the mesh quality and cost more time. Furthermore, the approach using objective function is compared with Freitag’s common approach. It is clearly shown that it performs better than the existing approach.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 151-163
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Synthesis and Characterization of 1-(1-chlorocyclopropyl)-2-(1,2,4-triazol-1-yl)ethan-1-one
Autorzy:: Ji, H.
Niu, Y.
Liu, D.
Wang, W.
Dai, C.
Powiązania:: https://bibliotekanauki.pl/articles/778677.pdf
Data publikacji:: 2017
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: prothioconazole
1,2,4-triazole
N-alkylation reaction
Opis:: A simple and efficient method to prepare 1-(1-chlorocyclopropyl)-2-(1,2,4-triazol-1-yl)ethan-1-one via nucleophilic substitution of 2-chloro-1-(1-chlorocyclopropyl)ethanone and 1,2,4-triazole is described. The title compound is the key intermediate required for the synthesis of prothioconazole, a promising agricultural fungicide. By exploring changes in the reaction time, temperature, ratio of starting reagents, acid binding agent, and the nature of phase transfer catalyst, the reaction conditions could be optimized to afford the desired N-alkylated material in near-quantitative yield. The ultimate yield of the product after recrystallization was 93%, with a purity of 99% based on its characterization by Gas Chromatography-Mass Spectrometer (GC-MS), Fourier Transform infrared spectroscopy (IR), Proton Magnetic Resonance (¹H NMR), and Carbon-13 Nuclear Magnetic Resonance (¹³C NMR). The synthetic process is suitable for industrial application, with the advantages of high yield and facile preparation under mild operating conditions.
Źródło:: Polish Journal of Chemical Technology; 2017, 19, 1; 41-47
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Contactless Electroreflectance Study of Temperature Dependence of Fundamental Band Gap of ZnSe
Autorzy:: Krystek, W.
Malikova, L.
Pollak, F. H.
Tamargo, M. C.
Dai, N.
Zeng, L.
Cavus, A.
Powiązania:: https://bibliotekanauki.pl/articles/1934065.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.40.Fy
78.20.Wc
78.20.-e
Opis:: We report a systematic study of the temperature variation of the energy [E$\text{}_{0}$(T)] and broadening parameter [Γ$\text{}_{0}$(T)] of the fundamental band gap of ZnSe in the range 27 K < T < 370 K using contactless electroreflectance. The obtained values of E$\text{}_{0}$(T) and Γ$\text{}_{0}$(T) have been fit to various semi-empirical expressions to obtain information about the exciton-phonon coupling in this system. The experimentally determined E$\text{}_{0}$(T) also is of significance for technological applications since it can be used to determine the operating temperature of ZnSe-based devices such as quantum well lasers.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 1013-1017
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Fast and effective extraction for equivalent shunt resistances of triple-junction concentrator solar cells
Autorzy:: Lv, H
Dai, J
Sheng, F
Liu, W
Ma, X
Cheng, C
Lv, Q
Powiązania:: https://bibliotekanauki.pl/articles/174425.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: concentrator photovoltaic
triple junction solar cell
equivalent shunt resistance
Opis:: Fast and effective extraction of equivalent shunt resistance for each subcell of GaInP/GaInAs/Ge triple-junction concentrator solar cells is presented. The two-diode model of single junction was introduced to establish the equivalent circuit of triple-junction solar cells. The current-voltage characteristic of the triple-junction solar cells was measured under AM1.5D spectrum, C = 576 and T = 303 K. Equivalent shunt resistance of each subcell was extracted from its estimated current-voltage curve. The estimated current-voltage curve of the triple-junction solar cells shows a good agreement with the experimental data in 0.31% deviation. The degradation in the equivalent shunt resistance for Ge subcell was intentionally introduced to indicate the mechanism of current-matching operation for different subcells, with the maximum output power of the triple-junction solar cells deteriorating from 3.5 to 3.17 W. The results can offer performance analysis and optimum design of photovoltaic applications.
Źródło:: Optica Applicata; 2015, 45, 2; 227-235
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fuzzy Techniques in the Functional Approximation of Volumetric Capnograms
Autorzy:: Scandurra, A. G.
Pra, Ana L. Dai
Passoni, L. I.
Meschino, G. J.
Clara, F. M.
Tusman, G.
Böhm, S. H.
Powiązania:: https://bibliotekanauki.pl/articles/108656.pdf
Data publikacji:: 2011
Wydawca:: Społeczna Akademia Nauk w Łodzi
Tematy:: volumetric capnography
Takagi-Sugeno Fuzzy Inference Systems
functional modeling
Opis:: The Volumetric Capnography (VC) is the plot of amounts of expired CO₂ within one tidal breath. The estimation of physiologic parameters derived from the VC is useful in the study of respiratory physiology, clinical anesthesia and critical care medicine. In this work we propose the use of a function based on a Takagi-Sugeno fuzzy model and a functional approximation based on the Levenberg-Marquardt algorithm to approximate the VC, with the goal to compute two variables of interest: the airway dead space (V_Daw) and the slope of the so-called Phase III (S_III). These models presented a good performance in those capnograms that showed difficulties to be modeled with traditional medical analysis.
Źródło:: Journal of Applied Computer Science Methods; 2011, 3 No. 1; 17-29
1689-9636
Pojawia się w:: Journal of Applied Computer Science Methods
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Compressive optical image encryption using phase-shifting interferometry on a joint transform correlator
Autorzy:: Li, J.
Jia, B.
Dai, X.
Lei, M.
Yang, C.
Li, H.
Li, R.
Powiązania:: https://bibliotekanauki.pl/articles/174905.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: fully optical system
holographic interferometry
joint transform correlator (JTC)
binary scrambling method
inverse problems
Opis:: A compressive optical image encryption method, which combines compressive sensing with phase-shifting interferometry on a joint transform correlator, is proposed in the fully optical domain. The object image is first permutated using a binary scrambling method. Next, the permutated object field is encrypted and registered as the holograms by phase-shifting interferometry on the joint transform correlator setup. Then, the encrypted images and the key are compressed to the compressed data using single-pixel compressive imaging. The original image can be reconstructed and decrypted using the specified algorithm. The simulations demonstrate that the method is effective and suitable for image security transmission.
Źródło:: Optica Applicata; 2017, 47, 2; 245-256
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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