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1
Content available Interaction between sphalerite and pyrite and its effect on surface oxidation of sphalerite
Yang B., Xie X., Tong X., Lan Z., Cui Y.
Physicochemical Problems of Mineral Processing
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2018
|
Vol. 54, iss. 2
311--320
EN
The interaction between sphalerite and pyrite was investigated by dissolution test, X-ray photoelectron spectroscopy (XPS), zeta potential measurement and density functional theory (DFT) calculation. Dissolution tests indicated that sphalerite dissolution was promoted due to the galvanic interaction between sphalerite and pyrite. The Zn2+ ion concentration increased with increasing pyrite content and dissolved time. XPS analysis results demonstrated that a new oxidation product was formed on the sphalerite surface in the presence of pyrite in a pulp. Zeta potential measurements showed that the isoelectric point of sphalerite increased from 3.3 to 5.4 due to galvanic interaction. DFT calculation results suggested that electron transfer from sphalerite to pyrite occurred when they contacted. The Zn 4s and S 3p states of sphalerite lost electrons. The Fe 4p and 4s of pyrite states obtained electrons, and Fe 3d and S 3s states lost a small number of electrons. The surface oxidation of sphalerite was promoted due to the interaction with pyrite, and the collectorless floatability of sphalerite decreased.
2
Content available Kinetics of photoelectrocatalytic degradation of diclofenac using N, S co-doped TiO2 nano-crystallite decorated TiO2 nanotube arrays photoelectrode
Cui Y., Deng X., Ma Q., Zhang H., Cheng X., Li X., Xie M., Cheng Q., Li B.
Environment Protection Engineering
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2018
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Vol. 44, nr 2
117-130
EN
As a non-steroidal anti-inflammatory drug, diclofenac, was commonly used as analgesic, antiarthritic and antirheumatic, and has frequently been detected in municipal wastewater treatment plants (MWTPs) effluents and demonstrated to be potentially environmental risk on human beings. In the present study, N, S co-doped TiO2 nano-crystallites decorated TiO2 nano-tube arrays (N, S-TiO2 NCs/TiO2 NTAs) photoelectrode was used to degrade diclofenac containing wastewater. In addition, the effects of some critical parameters including initial pH, external positive potential, sodium sulfate concentration and initial diclofenac concentration on the photoelectrocatalytic (PEC) degradation of diclofenac containing wastewater and dynamic characteristics were investigated systematically. Results showed that N, S-TiO2 NCs/TiO2 NTAs photoelectrode exhibited high PEC efficiency for the degradation of diclofenac, in which the PEC processes fitted well with the Langmuir–Hinshelwood (L–H) model. Furthermore, external additional anions such as Cl–, ClO– and NO3 – played an important role in inhibiting the degradation of diclofenac. Also, the N, S-TiO2 NCs/TiO2 NTAs photoelectrode possessed good stability for consecutive applications for degradation of diclofenac, which could potentially be utilized in wastewater treatment.
3
Content available remote Characteristic Studies on Imitation Control for Static Walking of Biped Robot
Cui Y., Byun H. J., Shon S. G.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 5
26-29
EN
The purpose of this paper is to present a new kind of imitation control architecture for a biped robot. A human operator can interact with the robot and control it to walk. The robot is built based on the skeletal structure of humans. Partial joints are controlled by the operator wearing motion sensors in the body and other joints controlled by the controller. This paper describes the difficulties of balance control due to the random trajectory data by the operator and gives a static walking control method to keep the posture of the robot stable in imitation walking.
PL
W artykule opisano strukturę sterowania metodą naśladowczą dla robota dwunożnego, zbudowanego na podstawie struktury ludzkiego szkieletu. Algorytm umożliwia kontrolę robota, w tym ruchów związanych z chodzeniem i utrzymanie stabilnej pozycji. Przedstawiono problemy związane z balansem.
4
Content available A method for probing the refractive index change in photorefractive crystals
Fu M., Gao C., Wang X., Cui Y., Dai S
Optica Applicata
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2013
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Vol. 43, nr 4
731--737
EN
A method for probing refractive index changes in photorefractive crystals using an interferometric technique and digital image processing was proposed. Based on equal thickness interference in LiNbO3 crystal and Fourier transform profilometry, we obtained phase value changes in interferograms induced by a photorefractive effect, and further calculated refractive index changes. The maximal values for extraordinary light (e-light) and ordinary light (o-light) are 6.6×10–4 and 1.2×10–4, respectively.
5
Content available remote New delay-dependent stability for systems with interval time-varying delay
Cui Y., Zhang T.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 3b
97-99
EN
This paper is concerned with the stability of systems with interval time-varying delay. By employing a new and tighter integral inequality and constructing an appropriate type of Lyapunov functional, the improved delay-dependent stability criteria are derived. Because neither any model transformation nor free weighting matrices are employed in the theoretical derivation, the developed stability criteria simplify and improve the existing stability conditions. Numerical examples are given to demonstrate the effectiveness and the benefits of the proposed methods.
PL
Analizowano stabilność systemów z interwałowym zmiennym w czasie opóźnieniem. Wyprowadzono nowe kryteria stabilności bazując na funkcjonale Lapunowa.
6
Content available remote Image Despeckling Based on LMMSE Wavelet Shrinkage
Cui Y., Zhang T., Yu W.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
269--272
EN
A low complexity method for suppressing speckle in synthetic aperture radar (SAR) images is proposed. This method doesn’t require the logarithmic transform and is an extension of the linear minimum mean square error (LMMSE) filter to the image wavelet representation. A spatially adaptive shrinkage function is obtained and each modified coefficient is decided separately. Simulation results for the simulated SAR images demonstrate the proposed method outperforms some representative SAR despeckling methods.
PL
Zaproponowano metodę poprawy jakości obrazu w radarach typu SAR. Bazuje ona na liniowym minimum średniej kwadratu błędu LMMSE filtru. Wykorzystano adaptacyjną funkcję zbieżną w przestrzeni i wszystkie współczynniki modyfikowane są niezależnie.
7
Content available remote Composite Adaptive Inverse Controller Design for Permanent Magnet Synchronous Motor
Qu Y., Gong Y., Cui Y., Han T.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
365--369
EN
Permanent magnet synchronous motor (PMSM) servo system is a nonlinear, multi-variables strong coupling system. To improve the performance of the PMSM system, a composite adaptive inverse control strategy is proposed. This control strategy adopt improved radial basis function (RBF) neural network and FIR filter as nonlinear filter. The proposed filter is used to identify the system, inverse system and design the adaptive inverse controller. Meanwhile the chaos multi-population particle swarm optimization (CMPSO) algorithm is proposed to training the parameters of the nonlinear filter offline. And then an improved variable step size LMS (IVSLMS) algorithm is used to optimize the parameters online. These algorithm improves the convergence speed and accuracy, further improves the control performance of adaptive inverse control. The results of simulation and experiment indicate that the PMSM servo system has good dynamic, static performance and robustness by using proposed hybrid adaptive inverse control strategy.
PL
W celu poprawy parametrów silnika synchronicznego z magnesami trwałymi PMSM zaproponowano kompozytowa adaptacyjną strategię sterowania. Strategia wykorzystuje sieć neuronową i nieliniowy filtr SOI.
8
Content available Synthesis of the cross-linked humic acid supporting palladium catalyst and its catalytic properties for Heck reaction
Xu Q., Shi W., Cui Y.
Polish Journal of Chemical Technology
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2012
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Vol. 14, nr 2
75-79
EN
Cross-linked humic acid supporting palladium (CL-HA-Pd) catalyst was prepared readily and characterized by infrared analysis (IR) and thermogravimetric analysis (TG). The catalyst could catalyze the Heck reaction of aryl halide or substituted aryl halide with vinyl compounds in N2 atmosphere; the yields were above 95%. The catalyst could be recovered and reused 7 times with the Heck reaction of iodobenzene with acrylic acid, and the yield was above 75.6%. The results showed that the catalyst had high catalytic activity even at low temperature of 62°C or with a small amount of the catalyst.
9
Content available Nash-lambda algorithm with applications in safety and reliability
Cui Y., Guo R.
Journal of Polish Safety and Reliability Association
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2011
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Vol. 2, No. 1
51--58
EN
In this paper, a new algorithm, named as Nash-lambda algorithm by merging Nash equilibrium solution and the lambda algorithm, is proposed. The lambda algorithm, a new global optimization algorithm, is created by imitating ancient Chinese human body system model, which has already demonstrated its simplicity in searching scheme, codes and efficiency in computation comparing to the genetic algorithm. The noncorporative game environments determine the optimization problems which are different from those of the traditional safety and reliability optimizations because of the engagement of the Nash equilibrium for seeking the best strategy. The lambda algorithm serves the searching the Nash equilibrium solution efficiently. In other worlds, the Nash-lambda algorithm is just developed to address the optimization problems of the multiple objective functions representing non-corporative players’ interests.
10
Content available Lifetime distributions with wave-like bathtub hazard
Guo R., Thiart C., Cui Y., Guo D.
Journal of Polish Safety and Reliability Association
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2011
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Vol. 2, No. 1
115--122
EN
In this paper, we argue the necessity of dealing with lifetime distributions with wave-like bathtub hazard function. Four classes of wave-like bathtub hazards are investigated. For preparing maximum likelihood estimation of the hazard parameters, the first-order and second-order partial derivatives are derived.
11
Content available Lambda algorithm and maximum likelihood estimation
Cui Y., Guo R., Guo D.
Journal of Polish Safety and Reliability Association
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2011
|
Vol. 2, No. 1
59--72
EN
In this paper, a new global optimization algorithm by imitating ancient Chinese human body system model, named as lambda algorithm, is introduced. The lambda algorithm utilizes five-element multi-segment string to represent the n-dimensional Euclidean point and hence the string based operation rules for expansion, comparison and sorting candidate strings. The algorithm enjoys the simplest mathematical operations but generates highest searching speed and accuracy. We furthermore explore to merge the lambda algorithm with maximum likelihood procedure for creating a non-derivative scheme – likelihood- lambda procedure. A illustrative example is given.
12
Content available Reliability concept under general uncertainty
Guo R., Cui Y., Thiart C., Guo D.
Journal of Polish Safety and Reliability Association
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2010
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Vol. 1, No. 1
105--114
EN
The Toyota crisis is tearing off the brand image of quality and reliability and therefore it is logical to question whether the dominating position of probability theory, on which Japanese quality and reliability engineering practices are established, should be examined. In general, reliability analysis is an exercise under uncertain environment. Foundationally speaking, uncertain modeling is a matter of choosing what kind of uncertain measure as its standing point. In this paper, we introduce the uncertainty reliability concept on the platform of the axiomatic uncertain measure theory and compare it to probabilistic reliability concept based on Kolmogorov’s probability measure theory, on which the traditional quality and reliability engineering is established. It is expecting that a foundational work can be established for a more rigorous reliability engineering and risk analysis under general uncertainty environments.
13
Content available Hybrid reliability modelling under general uncertainty
Guo R., Cui Y., Thiart C., Guo D.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 1
115--122
EN
The real world phenomena are often facing the co-existence reality of different formality of uncertainty and thus the probabilistic reliability modeling practices are very doubtful. Under complicated uncertainty environments, hybrid variable modeling is important in reliability and risk analysis, which includes Bayesian distributional theory, random fuzzy distributional theory, as well as fuzzy random distributional theory as special distribution families. In this paper, we define a new hybrid lifetime which is specified by a random lifetime distribution with an uncertain distributed parameter, which is called as random uncertain hybrid lifetime. We furthermore define the average chance distribution as a quality index for quantifying the hybrid lifetime and accordingly the average chance reliability is derived.
14
Content available Decision theory under general uncertainty
Cui Y., Guo R., Dunne T., Guo D.
Journal of Polish Safety and Reliability Association
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2010
|
Vol. 1, No. 1
51--66
EN
The exposure of Toyota management’s cover-up of its faulty car component problems raises a fundamental question: did Toyota management make an appropriate decision taking all uncertainties into account? Statistical decision theory is a framework with a probabilistic foundation, which admits random uncertainty about the real world and human thinking. In general, the uncertainty of the real world is diversified and therefore the effort of trying to deal with different forms of uncertainty with one special form of uncertainty, namely random uncertainty, may be oversimplified. In this paper, we introduce an axiomatic uncertain measure theoretical framework and explore the essential mechanism in formulating a general uncertainty decision theory. We expect that a new understanding of uncertainty and development of a corresponding new uncertainty decision-making approach may assist intelligence communities to survive and deal with the extremely tough and diverse aspects of an uncertain reality.
15
Content available Catalytic performances of cross-linking humic acids supported Pd/Ni bimetallic catalyst for heck reaction
Xu Q., Zhang L., Shi W., Cui Y.
Polish Journal of Chemical Technology
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2009
|
Vol. 11, nr 3
22-26
EN
The cross-linking humic acids (CL-HAs), epichlorohydrin as the cross-linking reagent and the supported Pd/Ni bimetallic catalysts (CL-HAs-Pd/Ni) were prepared and characterized by IR, AAS, XPS, TEM. The effects of reaction time, temperature, base, solvent and the amount of catalyst on the properties of the catalyst were studied. These catalysts could catalyze the Heck reaction of aryl halides and substituted aryl halides with acrylic acids or styrene successfully; the yields were all above 95%.
16
Content available remote Amperometric determination of tyrosinase catecholase activity using a screen-printed electrode
Cui Y., Barford J. P., Renneberg R.
Chemia Analityczna
|
2007
|
Vol. 52, No. 1
5-14
EN
A fast amperometric method for the determination of tyrosinase-catecholase activity has been proposed. The principle of the method is as follows: tyrosinase-catecholase converts catecho! to benzoquinone in the presence of oxygen; benzoquinone is subsequently reduced at the working electrode which generates an appropriate current signai. The method has a good analytical characteristics and a broad detection range (0.01-10.00 U mL1). It is easy to handle, and requires short measuring time (l min).
PL
Zaproponowano szybką metodę wyznaczania aktywności katecho lazy -ty róży nazy. Metoda polega na przekształceniu przez katecholazę-tyrozynazy katecholu w benzochinon w obecności tlenu. Benzochinon jest redukowany na elektrodzie tworząc odpowiedni sygnał prądowy. Zaproponowana metoda ma dobrą charakterystykę analityczną: obejmuje szeroki zakres stężeń analitu (0.01-10.00 U mL1).Dodatkowo jest łatwa w stosowaniu i wymaga tylko 1-minutowych pomiarów.
17
Content available remote Property (L) in Orlicz sequence spaces equipped with the Luxemburg norm
ChunXue W., Cui Y.
Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae
|
2003
|
[Z] 43(2)
301-309
EN
In this paper, we prove that a banach space X with the property (L) with respect to the function [ro](r,s) has the uniform Opial property if and only if [ro](1,s)>1 for any s>0. The criterion in order that an Orlicz sequence space equipped with the Luxemburg norm has the property (L) is given.
18
Content available remote Compact midpoint local uniform convexity in Orlicz spaces
Li X., Cui Y.
Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae
|
2002
|
[Z] 42(1)
53-62
EN
In this paper, we introduce a new geometric property in Banach spaces, namely compact midpoint local uniform convexity. Criteria for this property in Orlicz spaces are given for both norms in the function case as well as in the sequence case.
19
Content available remote Opial's modulus in Köthe sequence spaces
Cui Y., Li Y., Płuciennik R.
Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae
|
1999
|
[Z] 39
43-56
EN
It is found a modified formula for Opial's modulus rX of order continuous Köthe sequence space X without Schur's property. By using this result, the Opial's modulus of Lebesgue sequence spaces as well as Cesaro sequence spaces can be computed easily. Moreover it is proved in the Köthe se-quence space X with the Fatou property the condition rX(1)>0 implies the order continuity of X.
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