scispace - formally typeset
Search or ask a question

Showing papers by "University of Science and Technology Beijing published in 2005"


Journal ArticleDOI
TL;DR: In this article, the effect of preparing conditions on the deposition of ZnO nanorods was systematically studied by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy.

449 citations


Journal ArticleDOI
TL;DR: Compared to the widely used commercially available SPME fibers, this proposed disposable IL-coated fiber has much lower cost per determination, comparable reproducibility (RSD < 11%), and no carryover between each determination.

285 citations


Journal ArticleDOI
TL;DR: In this article, high-quality single crystals growing along [001] direction with a high consistent orientation perpendicular to the substrate were successfully prepared on ITO substrates at different growth temperatures by using a simple hydrothermal method.

204 citations


Journal ArticleDOI
TL;DR: Multi-walled carbon nanotubes are used as adsorbent for solid-phase extraction (SPE) of several chlorophenols (CPs) and under the optimized conditions, detection limits of 0.08-0.8 ng mL(-1) were obtained.

173 citations


Journal ArticleDOI
TL;DR: In this paper, a new model for predicting the reacted fraction of hydriding/dehydriding in powder hydrogen storage materials has been developed, which offers an analytic form expressing the reaction fraction of hydrogen absorption/desorption (A/D) as a function of time, temperature and pressure explicitly.

147 citations


Journal ArticleDOI
TL;DR: In this paper, the authors used a low cost, low-temperature hydrothermal approach, well-aligned ZnO nanorods with high aspect ratio have been successfully prepared on ITO substrates that were pre-modified with znO nanoparticles.

137 citations


Journal ArticleDOI
TL;DR: In this article, the effect of co-adsorption of A and B on their aggregation behavior and photosensitization was investigated, and it was found that the aggregates of the cyanine dyes were efficient in light harvesting and that the mixture of a and B could be employed to sensitize the solar cell over the entire visible spectrum.

124 citations


Journal ArticleDOI
TL;DR: In this paper, a low-cycle isothermal mechanical fatigue testing of bulk solders and solder joints of eutectic Sn-37wt%Pb, Sn-3.5wt%Ag, and Sn-4.0-Cu was carried out at room temperature over a wide range of strains (1% 10%).
Abstract: Low-cycle isothermal mechanical fatigue testing of bulk solders and solder joints of eutectic Sn-37wt%Pb, Sn-3.5wt%Ag, and Sn-4.0wt%Ag-0.5wt%Cu were carried out at room temperature over a wide range of strains (1% 10%). The fatigue results of both bulk and solder joints were compared and the eutectic Sn-37wt%Pb was used for reference. Concerning bulk solders and solder joints, the two lead-free solders displayed better fatigue properties than Sn-37Pb. For all three solder alloys tested, bulk solders showed better fatigue performance than solder joints when subjected to higher strains. The situation was the opposite at lower strains, resulting in bulk solders depicting larger values for the Coffin-Manson fatigue exponent and ductility coefficient compared to solder joints.

107 citations


Book ChapterDOI
14 Sep 2005
TL;DR: This paper proposes a SVM regression based algorithm for filling in missing data, i.e. set the decision attribute (output attribute) as the condition attribute (input attribute) and the condition attributions as the decision attributes, then use S VM regression to predict the conditionattribute values.
Abstract: In KDD procedure, to fill in missing data typically requires a very large investment of time and energy – often 80% to 90% of a data analysis project is spent in making the data reliable enough so that the results can be trustful. In this paper, we propose a SVM regression based algorithm for filling in missing data, i.e. set the decision attribute (output attribute) as the condition attribute (input attribute) and the condition attribute as the decision attribute, then use SVM regression to predict the condition attribute values. SARS data set experimental results show that SVM regression method has the highest precision. The method with which the value of the example that has the minimum distance to the example with missing value will be taken to fill in the missing values takes the second place, and the mean and median methods have lower precision.

94 citations


Proceedings ArticleDOI
07 Nov 2005
TL;DR: A hybrid system for classifying ear images is proposed that combines independent component analysis (ICA) and RBF network and the recognition rate of ICA RBF method is improved substantially.
Abstract: Ear recognition is a new biometrics technique. Due to its unique physiological structure, position and stability, ear recognition is expected to be a promising authentication technique. In this paper, a hybrid system for classifying ear images is proposed. This system combines independent component analysis (ICA) and RBF network. The original ear image database is decomposed into linear combinations of several basic images. Then the corresponding coefficients of these combinations are fed up into RBF network instead of an original feature vector comprised of pixel values of grayscale images. The local features extraction of ICA and the adaptability of RBF neural network are combined reasonably. The robustness of the system is enhanced. The experiment results show that the recognition rate of ICA RBF method is improved substantially.

80 citations


Journal ArticleDOI
TL;DR: In this paper, the lattice inversion method was used to study the properties of carbides with complex structure and the results indicated that the increase in the atomic number of the metal is accompanied by the decrease in the stability of its carbides.

Journal ArticleDOI
TL;DR: In this article, the elimination of Cr(VI) from an electroplating wastewater in China was studied by chemical precipitation (CP), electrodialysis (ED), and their combination.
Abstract: In this work, the elimination of Cr(VI) from an electroplating wastewater in China was studied by chemical precipitation (CP), electrodialysis (ED), and their combination The experimental results show that CP was effective as a rougher treatment for removing Cr(VI) from a high Cr(VI) wastewater, but not for a deep Cr(VI) elimination ED alone failed to achieve a deep Cr(VI) elimination from a high Cr(VI) wastewater, although it was very effective for a medium Cr(VI) wastewater The mechanism might be attributed to the sedimentation of chromatic ions as polychromates in the pores of ED membranes because of high Cr(VI) concentration in wastewater, which may block the pores and thus stop the transportation of the ions through the pores It was found that the combined chemical precipitation and electrodialysis (CP + ED) process is an effective and economic process to treat high Cr(VI) electroplating wastewater This process allows treated water to be completely recycled to electroplating lines, fewe

Journal ArticleDOI
TL;DR: In this article, the growth velocity and alloy composition in La x Al 14 (Cu, Ni, Ni) 86 ¼ x alloys were experimentally studied as a function of growth velocity, and the composition-velocity ranges were determined for the formation of eutectic, amorphous and compound dendrites.

Journal ArticleDOI
TL;DR: In this paper, the effect of processing and heat treatment on the microstructure of a relatively large forged pancake was studied using X-ray diffraction, optical microscopy and scanning electron microscopy.

Journal ArticleDOI
TL;DR: In this paper, the site preference of Fe in Cr 23− x Fe x C 6 was investigated based on the interatomic potentials obtained by the lattice inversion method, and the calculated results showed that Fe atoms preferentially substitute for Cr at 4a sites first and then 8c sites.

Journal ArticleDOI
TL;DR: In this article, the corrosion of a new nickel base superalloy, INCONEL alloy 740, has been studied at 550 and 700°C on exposure to the synthetic coal ash/flue gas environments by means of XRD, SEM, and EDX.

Journal ArticleDOI
TL;DR: In this article, the authors used a field emission gun-analytical transmission electron microscopy (FEG-ATEM) to study the behavior of stress corrosion cracking (SCC) cracks in 304L stainless steel in high temperature oxygenated water.

Journal ArticleDOI
TL;DR: In this article, Nanometer scale WC-11Co powder was sintered by spark plasma sintering (SPS) process in order to improve the properties of the cemented carbides.

Book ChapterDOI
TL;DR: Feasibility and characteristics of ear recognition was discussed, recent advances in 2D and 3D domain was presented and a proposal for future research topics, such as ear database generation, ear detection, ear occluding problem and multimodal biometrics with face etc.
Abstract: Application and research of ear recognition technology is a new subject in the field of biometrics recognition. Earlier research showed that human ear is one of the representative human biometrics with uniqueness and stability. Feasibility and characteristics of ear recognition was discussed and recent advances in 2D and 3D domain was presented. Furthermore, a proposal for future research topics was given, such as ear database generation, ear detection, ear occluding problem and multimodal biometrics with face etc.

Journal ArticleDOI
TL;DR: In this paper, the effect of controlled rolling and cooling process parameters, such as finish rolling temperature, loop-laying temperature and cooling rate in the process from the loop layer to the coil station, on the microstructures and mechanical properties of 60Si2MnA spring steel rod were carefully investigated by thermal simulation, tensile tests and quantitative metallography.

Journal ArticleDOI
TL;DR: In this article, the Pb1−xLaxTiO3 powders were prepared by a sol-gel route in the composition range from x=0.0 to 0.3 in 0.05 increments.
Abstract: The Pb1−xLaxTiO3 powders were prepared by a sol–gel route in the composition range from x=0.0 to 0.3 in 0.05 increments. The lattice parameters of Pb1−xLaxTiO3 (x=0.0, 0.05, 0.10, 0.15, 0.20, 0.30) were determined by a high temperature X-ray diffraction, and the intrinsic thermal expansion coefficients were obtained in the temperature range from room temperature to 900°C. The Pb1−xLaxTiO3 compounds (x=0.10, 0.15, 0.20) in the tetragonal system exhibit low thermal expansion behaviors. As the La content is increased, the phase transition in the Pb1−xLaxTiO3 changes continuously from conventional to diffuse phase transition.

Journal ArticleDOI
TL;DR: This work describes the first frontal polymerization synthesis of a graft copolymer superabsorbent hydrogel of acrylic acid onto starch at high monomer and initiator concentration and the ultimate properties of the product appear to depend on the polymerization front velocity and the temperature.
Abstract: Recently, a considerable amount of research has centered on uniquely structured polymers synthesized through self-propagating frontal polymerization. The obtained polymer materials have better features than those obtained by using the classical batch route. The additional advantages are short reaction times and low cost. This work describes the first frontal polymerization synthesis of a graft copolymer superabsorbent hydrogel of acrylic acid onto starch at high monomer and initiator concentration. The effects of varying the relative amounts of the reaction components on the most relevant parameters relating to frontal polymerization were explored. The front velocity dependence on initiator concentration could be fit to a power function. The temperature profiles were found to be very sharp with a maximum temperature below 150 degrees C, which was responsible for high monomer conversion. The ultimate properties of the product appear to depend on the polymerization front velocity and the temperature. The high-temperature and rapid temperature increase at the polymerization front led to products with interconnected porous structures caused by the evaporation of water. So, a fast-swelling, highly absorbing hydrogel with respect to batch polymerization was obtained.

Journal ArticleDOI
TL;DR: This study shows that enhancement of lactic acid production from kitchen garbage can be realized by using high-performance LAB, and this recycling system is conducive to clear away pollutants and to reduce cost of LA production.
Abstract: To enhance lactic acid (LA) production from kitchen garbage, which is a raw material for biodegradable plastics production, the application of high-performance lactic acid bacteria (LAB) as inocula was investigated. Two wild strains of Lactobacillus species, designated as TH165 and TD175, were isolated and screened from kitchen garbage. Strain TH165 was capable of hydrolyzing starch to produce LA; 49.5% of starch was broken down in fermentation medium containing 8.52 g/L of soluble starch, and 4.01 g/L of LA was produced after 24 h fermentation at 37°C without pH control. Strain TD175 could produce 16.06 g/L of LA, 66.9% higher than that of Lactobacillus bulgaricus ACCC11058 in fermentation medium containing 2.0% glucose at 30°C without pH control. Furthermore, coinoculation of strains TH165 and TD175 enhanced the LA production, resulting in 33.80 g/L of LA concentration and 0.46 g/g (DW) of LA yield from nonautoclaved kitchen garbage after 72 h fermentation with pH maintained at 5.5–6.0, values ...

Journal ArticleDOI
TL;DR: The analytical method had been applied to the determination of glucose, ribose, isomaltose and maltose in real serum samples and good results with low relative standard deviation not more than 5.3% were obtained.

Journal ArticleDOI
TL;DR: In this paper, a simple vapor phase growth method was used for large-scale synthesis of high-purity Mn 3 O 4 nanowires on silicon substrates, which had an average diameter of ∼200nm and length of 10μm.

Journal ArticleDOI
TL;DR: In this article, the reaction of C 3 N 3 Cl 3 and Li 3 N has progressed in a high-efficient way under the conditions of high-energy ball milling, and the products have the glassy morphology with different dimension from micron to nano scales.
Abstract: Under the conditions of high-energy ball milling, the reaction of C 3 N 3 Cl 3 and Li 3 N has progressed in a high-efficient way. Carbon nitride with the atomic ratio of 1.23–1.30 for N to C that is very similar to the stoichiometry of C 3 N 4 has been obtained. Moreover, XRD reveals that with the prolonging of the milling time, the products can be soon transformed to comparatively well-crystallized graphitic carbon nitride (g-C 3 N 4 ). SEM investigations show the products have the glassy morphology with different dimension from micron to nano scales. The XPS analysis shows the products have the presumable element compositions and the chemical bond state.

Journal ArticleDOI
TL;DR: In this paper, the photodegradation of atrazine in topsoil under solar light and the factors affecting this have been studied, and the results show that soil granularity, pH value, humidity, organic content, humic acid and surface active agents could affect the photolytic depth of 0.5mm and half-life of 4-8 days.

Journal ArticleDOI
TL;DR: In this paper, the current status of research and application in the AZ(Mg-Al-Zn), AS(mg-al-Si), AE(mAl-RE), AX(m al-Ca), ACM or MRI(MgAl-Ca-RE)and AJ> series elevated temperature magnesium alloys are reviewed, will special attention paid to the effects of alloying elements and the control of second phases.
Abstract: The current status of research and application in the AZ(Mg-Al-Zn), AS(Mg-Al-Si), AE(Mg-Al-RE), AX(Mg-Al-Ca), ACM or MRI(Mg-Al-Ca-RE)and AJ(Mg-Al-Sr)series elevated temperature magnesium alloys are reviewed, will special attention paid to the effects of alloying elements and the control of second phases. The existing problems on the development of elevated temperature magnesium alloys are discussed.

Journal ArticleDOI
TL;DR: A simple and easily adaptable deadlock avoidance algorithm for an automated guided vehicle (AGV) system that uses the graph-theoretic approach that is suitable for the AGV system in a flexible manufacturing system (FMS) and a retail or postal distribution center.
Abstract: In this paper, a simple and easily adaptable deadlock avoidance algorithm for an automated guided vehicle (AGV) system is presented. This algorithm uses the graph-theoretic approach. Unlike Petri-net-based methods, which are complex and static, it is easy to modify the existing model as the configuration of the system changes. Therefore, it is suitable for the AGV system in a flexible manufacturing system (FMS) and a retail or postal distribution center. Moreover, because it is very simple, it is appropriate for real-time control mechanisms. This paper consists of two parts: the first part presents an AGV deadlock avoidance algorithm that uses the graph-theoretic approach, and the second suggests appropriate routing strategies based on the proposed algorithm. The results show that this deadlock avoidance algorithm can be modified easily whenever the configuration of an FMS changes and provide high-performance on the deadlock avoidance. Finally, experimental results that confirm the validity of this approach are provided.

Journal ArticleDOI
TL;DR: In this article, resistance sintering under ultra-high pressure was developed to fabricate W-Cu composite containing 5-80v/o copper, and the consolidation was carried out under pressure of 6-8 GPa and input power of 18-23kW for 50 s. The densification effect and microstructure of these composites were investigated.