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1
Content available remote Sharp and laterally constrained multitrace impedance inversion based on blocky coordinate descent
Wang Y., Lin W., Cheng S., She B., Hu G., Liu W.
Acta Geophysica
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2018
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Vol. 66, no. 4
623--631
EN
Seismic impedance inversion is a well-known method used to obtain the image of subsurface geological structures. Utilizing the spatial coherence among seismic traces, the laterally constrained multitrace impedance inversion (LCI) is superior to trace-by-trace inversion and can produce a more realistic image of the subsurface structures. However, when the traces are numerous, it will take great computational cost and a lot of memory to solve the large-scale matrix in the multitrace inversion, which restricts the efficiency and applicability of the existing multitrace inversion algorithm. In addition, the multitrace inversion methods are not only needed to consider the lateral correlation but also should take the constraints in temporal dimension into account. As usual, these vertical constraints represent the stratigraphic characteristics of the reservoir. For instance, total-variation regularization is adopted to obtain the blocky structure. However, it still limits the magnitude of model parameter variation and therefore somewhat distorts the real image. In this paper, we propose two schemes to solve these issues. Firstly, we introduce a fast algorithm called blocky coordinate descent (BCD) to derive a new framework of laterally constrained multitrace impedance inversion. This new BCD-based inversion approach is fast and spends fewer memories. Next, we introduce a minimum gradient support regularization into the BCD-based laterally constrained inversion. This new approach can adapt to sharp layer boundaries and keep the spatial coherence. The feasibility of the proposed method is illustrated by numerical tests for both synthetic data and field seismic data.
2
Content available remote Structure Design and Performance Analysis of Substation Area Backup Protection Communication Network in Smart Substation
Chen L., Zhang K., Xia Y., Hu G.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 5
182-186
EN
In this paper, the general design of substation area backup protection (SABP) communication network in smart substation is proposed, and taking a practical 220kV smart substation for the application object, the communication network’s specific structure is constructed. Besides, the specific network’s real-time performance is studied based on theoretical analysis and OPNET simulation, and its reliability is calculated according to reliability block diagram and fault tree combining with Bayesian technology. The results show that the two performances can meet the requirements.
PL
W artykule przedstawiono projekt sieci komunikacyjnej na potrzeby rezerwowego systemu zabezpieczeń w obszarze inteligentnej podstacji elektroenergetycznej. Proponowaną strukturę sieci zaimplementowano dla inteligentnej podstacji 220kV. Przeprowadzono także symulacje (OPNET) i analizę teoretyczną wydajności sieci w czasie rzeczywistym oraz parametrycznie określono jej niezawodność.
3
Content available remote A novel forward problem solver based on meshfree method for electrical impedance tomography
Hu G., Chen M., He W., Zhai J.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 2a
234--237
EN
In this paper the meshfree method is developed to solve the forward problem for electrical impedance tomography. Differing from finite element method and finite volume method, there is no mesh generation in meshfree method, which is easier to realize and more propitious to be developed as an adaptive procedures for image reconstruction. Numerical simulation results are presented and compared with the results of analytical solution. It is observed that the obtained results are consistent with the results of analytical solution.
PL
W artykule zaproponowano nowa metodę tomograficznej analizy impedancji w której nie generuje się oczek jak na przykład w metodzie elementów skończonych. Dzięki temu uzyskuje się łatwiejsza analizę, w tym także metodami adaptacyjnymi.
4
Content available remote Research on Effects of Deicing Salt on Adhesion properties between Asphalt Mortar and Aggregate
Li P., Fu G., Yang D., Hu G., Zheng J.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 1b
127-131
EN
Through working out a indoor plan of the effects of deicing salt on adhesion properties between asphalt mortar and aggregate, based on innovative experiments with water boiled method to analysis of the effects of deicing salt on adhesion properties between asphalt and basalt and the effects of deicing salt on adhesion properties between SBS modified asphalt and basalt. The results show that specimens have a greater difference in adsorption capacity with the different effect solutions, through the effect of CaCl2�ANC, the adhesion properties of asphalt and mortar and aggregate have been improved to some extent. In addition, through the effect of different deicing salt, the discrete levels of adsorption capacity of specimen different are different, through the effect of CaCl2, adhesion improving while the instability of adsorption capacity have appeared, but NC is relatively stable. Therefore, comprehensive consideration of the appropriate choice of the type of deicing salt can effectively reduce the effects of deicing salt on adhesion properties between asphalt mortar and aggregate.
PL
Artykuł analizuje wpływ soli użytej do odlodzenia na właściwości przyczepności między asfaltem a kruszywem. Odpowiedni dobór soli odmrażającej ma istotny wpływ na tę przyczepność.
5
Content available remote Modeling, Control and Implementation of a Lithium-ion Battery Charger in Electric Vehicle Application
Hu G., Duan S., Cai T., Liu B.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 1b
255-258
EN
The rapid development of Electric Vehicle powered by lithium-ion battery has resulted in significant interesting to charging device. However, the nonlinear characteristics of lithium-ion battery increase the complexity of charger designing. In this paper, to overcome the disadvantages, battery model is established and its parameters are evaluated adopted an exponential fitting method. Then an appropriate control strategy is proposed based on small signal model to realize the proposed charging strategy. Finally, experimental results from a laboratory prototype are shown to verify the feasibility of the proposed strategies.
PL
W pracy przedstawiono układ ładowania baterii litowych stosowanych w pojazdach elektrycznych. Problemem jest nieliniowa charakterystyka baterii dlatego układ musi mieć odpowiedni system sterowania zapewniający właściwą strategię ładowania.
6
Content available remote On the design of biodegradable hydrogels both thermosensitive and pH sensitive
Wang B., Guo Y., Hu G.
Materials Science Poland
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2010
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Vol. 28, No. 1
207--215
EN
A Pluronic oligo(?-caprolactone) block copolymer has been synthesized by ring opening polymerization of ?-caprolactone monomers in the presence of poly(ethylene oxide)-poly(propylene oxide) -poly(ethylene oxide) triblock copolymers, using stannous octoate as a catalyst, and then the block copolymer was terminated with an acryloyl group. A novel biodegradable pH- and temperature sensitive hydrogel has been fabricated by free radical copolymerization of diacylated macromer-methacrylic acid aqueous solution initiated by a redox initiator. The structures of products were characterized by the Fourier transform infrared spectroscopy. Variations of the equilibrium swelling ratio in various environmental solutions confirmed the pH- and temperature sensitivity of hydrogel, which were affected by the MAA content.
7
Observations of the Effect of Cationic Surfactant DTANO3 on the Novel Belousov-Zhabotinskii Reaction Catalyzed by a Tetraazamacrocyclic Complex
Hu G., Zhang J. F., Chen L. L., Chen P. P., Wang W., Song J. M., Qiu L. G., Hu L.
Polish Journal of Chemistry
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2009
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Vol. 83, nr 3
519-523
8
Content available remote Determination of hydrogen peroxide using an oscillating reaction system
Hu G., Hu L., Zhang Z.
Chemia Analityczna
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2008
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Vol. 53, No. 1
141-151
EN
A new method for precise determination of H3O,. based on perturbation of the oscillating reaction system caused by different amounts of H2O2 has been developed. Under optimum conditions the amplitude of polentiometric oscillations decreased linearly with the logarithm of H2O2, concentration in the range 9.0x10-4-1.80 x l0 H mol L-1, with correlation coefficient of 0.9992. Relative standard deviation (RSD) of five determinations of 1.1 * 10 mol L-42O2, was 0.6%.
PL
Opracowano nową metodę oznaczania H2O2 opartą na badaniach zaburzenia reakcji oksydacyjnej układu: pod wpływem różnych ilości H2O2. W optymalnych warunkach amplituda oscylacji potencjometrycznych zmniejszała się w sposób liniowy ze wzrostem stężenia 2O2-4-1.80 x l0 H mol L-1 ze współczynnikiem korelacji of 0.9992. Względne odchylenie standardowe (RSD), obliczone na podstawie 5 oznaczeń H2O2, o stężeniu 1.1 * 10 mol L-42O2, wynosiło 0.6%.
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