Showing papers by "Beijing Institute of Petrochemical Technology published in 2006"
TL;DR: The macropores and mesopores were successfully incorporated within the beta structure through transforming the silica skeleton of the macroporous silica monolith into zeolite beta using carbon mate as mentioned in this paper.
Abstract: The macropores and mesopores were successfully incorporated within the beta structure through transforming the silica skeleton of the macroporous silica monolith into zeolite beta using carbon mate...
67 citations
TL;DR: A hierarchical zeolite catalyst was synthesized by transforming the skeletons of a bimodal pore silica gel into a zeolites through a steam-assisted conversion method, and shows high catalytic activity and a long catalyst lifetime for catalytic cracking of large molecules.
59 citations
TL;DR: LiNi 3/8 Co 2/8 Mn 3/ 8− x Sn x O 2 (0.05, 0.10) was synthesized by stannum substitute of manganese to enhance its rate capability at first time as discussed by the authors.
35 citations
TL;DR: ZrO2-coated LiNi 1/3Co1/3Mn 1/ 3O2 materials were investigated using X-ray diffraction, scanning electron microscope, and charge-discharge tests.
Abstract: ZrO2-coated LiNi1/3Co1/3Mn1/3O2 materials were prepared by hydroxide precipitation. The structure and electrochemical properties of the ZrO2-coated LiNi1/3Co1/3Mn1/3O2 were investigated using X-ray diffraction, scanning electron microscope, and charge–discharge tests, indicating that the lattice structure of LiNi1/3Co1/3Mn1/3O2 were unchanged after the coating but the cycling stability was improved. As the coating amount increased from 0.0 to 0.5 mol.%, the initial capacity of the coated LiNi1/3Co1/3Mn1/3O2 decreased slightly; however, the cycling stability increased remarkably over the cut-off voltages of 2.5~4.3 V and the capacity retention reached 99.5% after 30 cycles at the coating amount of 0.5 mol.%. ZrO2 coating also improved the cycling stability of LiNi1/3Co1/3Mn1/3O2 over wider cut-off voltage of 2.5~4.6 V.
34 citations
TL;DR: In this article, electrical resistance tomography (ERT) was used to obtain cross sectional profiles of gas hold-up in a o56mm bubble column with four designs of gas sparger, and the effect of sparger geometry on the bubble distribution was revealed by applying a sensitivity conjugated gradients reconstruction method.
32 citations
TL;DR: In this article, the effects of nickel promoter on the preparation of molybdenum carbide and its catalytic performance for the hydrodesulfurization of dibenzothiophene (DBT) were studied.
27 citations
TL;DR: LiCoO 2 thin films were characterized by various methods such as XRD, SEM and AFM as mentioned in this paper, and the effect of the annealing temperature on the structure, the surface morphology and the electrochemical properties of the films were investigated.
24 citations
TL;DR: In this article, the efficiency of using MBPF filter to treat reclaimed water with respect to analysis of the CODCr, SS, NH3-N and turbidity for the water samples before and after adsorption and filtration with MBPF.
23 citations
TL;DR: In this article, the effect of palladium on the performance of Cr/ZnO catalyst for the synthesis of methanol from synthesis gas was investigated, and it was shown that the addition of the metal to the catalyst improved the performance.
Abstract: The effect of palladium on the performance of Cr/ZnO catalyst was investigated for the synthesis of methanol from synthesis gas. Hydrogen adsorption on the Pd-Cr/ZnO well fits the equation combination of Langmuir isotherm equation and Freundilich isotherm equation while CO adsorption well fits Freundilich model. Addition of palladium in Cr/ZnO promoted the activity and selectivity of methanol synthesis.
19 citations
TL;DR: In this article, a series of cracking tests in a comprehensive study were conducted on separate occasions involving all or parts of 10 Canadian vacuum gas oil (VGO) feeds and a catalyst.
19 citations
TL;DR: C(17)-heteroaryl steroids in moderate yields in moderate (10-60%) yields, but furanyl-2- and 5-chlorothienyl- 2-boronic acid did not give any coupling product.
TL;DR: A novel wavelet-based Generalized Gaussian Density (GGD) method for offline writer identification that not only achieves a better identification accuracy but also greatly reduces the elapsed time on calculation in the authors' experiments.
Abstract: Handwriting-based personal identification, which is also called handwriting-based writer identification, is an active research topic in pattern recognition. Despite continuous effort, offline handwriting-based writer identification still remains as a challenging problem because writing features can only be extracted from the handwriting image. As a result, plenty of dynamic writing information, which is very valuable for writer identification, is unavailable for offline writer identification. In this paper, we present a novel wavelet-based Generalized Gaussian Density (GGD) method for offline writer identification. Compared with the 2-D Gabor model, which is currently widely acknowledged as a good method for offline handwriting identification, GGD method not only achieves a better identification accuracy but also greatly reduces the elapsed time on calculation in our experiments.
TL;DR: In this article, spherical LiNi1/3Co 1/3Mn1/ 3O2 was successfully prepared by controlled crystallization and pyrolysis at 600°C for 3h.
Abstract: Spherical LiNi1/3Co1/3Mn1/3O2 was successfully prepared by controlled crystallization. The preparation started with the spherical coprecipitate of Ni1/3Co1/3Mn1/3CO3 from NiSO4, CoSO4, MnSO4, NH4HCO3, and NH3·H2O, followed by pyrolysis of Ni1/3Co1/3Mn1/3CO3 at 600°C for 3 h. The X-ray diffraction analysis showed that the homogeneous cubic (Ni1/3Co1/3Mn1/3)3O4 was obtained after the pyrolysis. Spherical LiNi1/3Co1/3Mn1/3O2 was obtained by sintering of the mixture of as-obtained (Ni1/3Co1/3Mn1/3)3O4 and LiOH·H2O at 900°C for 6 h in air. As-prepared spherical LiNi1/3Co1/3Mn1/3O2 presented initial discharge capacity of 162.9 mA h g−1 and capacity retention of 98% at 50th cycle.
TL;DR: In this paper, two series of WP/Al 2 O 3 catalyst precursors with WP mass loading in the range 18.5% to 37.1% were prepared using the impregnation method and mixing method, respectively, and the catalysts were then obtained by temperature-programmed reduction of supported tungsten phosphate in H 2 at 650°C for 4h.
TL;DR: It is a new idea to locally compute Euler Number of 2D image using the definition of the Foreground Segment and Neighbor Number and it is proved in this paper.
Abstract: Euler Number is one of the most important characteristics in topology. In two- dimension digital images, the Euler characteristic is locally computable. The form of Euler Number formula is different under 4-connected and 8-connected conditions. Based on the definition of the Foreground Segment and Neighbor Number, a formula of the Euler Number computing is proposed and is proved in this paper. It is a new idea to locally compute Euler Number of 2D image.
TL;DR: In this article, it was found that NiO crystalline sizes in the samples increased with decreasing Si/Ni molar ratio in the presence of poly (ethylene oxide) (PEO) with an average molecular weight of 10 000 and the catalyst of acetic acid.
Abstract: CuO/SiO2 and NiO/SiO2 with bimodal pore structure were prepared by sol-gel reactions of Tetra-methoxysilane (TMOS) and the respective metal nitrate in the presence of poly (ethylene oxide) (PEO) with an average molecular weight of 10 000 and the catalyst of acetic acid. In this process, the interconnected macroporous morphology was formed when transitional structures of spinodal decomposition were frozen by the sol-gel transition of silica. The addition of copper and nickel into the silica-PEO system had a negligible effect on the morphology formation. In gel formation, it was found that NiO crystalline sizes in the samples increased with decreasing Si/Ni molar ratio. It was considered that PEO interacted with both silica and nickel cations. In the CuO/SiO2 with the presence of PEO, CuO crystalline sizes were larger than those of NiO/SiO2. It was considered that there was no obvious interaction between the Cu cation and PEO, most of the copper ions in wet silica gel were present in the outer solution. They easily aggregated as copper salts in the drying process of wet gel and decomposed into CuO particles in heating. While in the CuO/SiO2 with the absence of PEO, the Cu was selectively entrapped as small particles in the gel skeleton due to the interaction between Cu aqua complex and silica gel network.
Journal Article•
TL;DR: In this article, the symmetrical relationship between diffusely backscattered polarization patterns in isotropic turbid media and simulates all two-dimensional elements of the Mueller matrix in both cases of Rayleigh and Mie scatterings using the double-scattering approximation and the Monte Carlo algorithm, respectively.
Abstract: As there exists an inconsistency in claiming the symmetrical relations in the 16 Mueller matrix elements used to describe a turbid medium, the author restudies the symmetrical relationships between diffusely backscattered polarization patterns in isotropic turbid media and simulates all two-dimensional elements of diffusely backscattered Mueller matrix in both cases of Rayleigh and Mie scatterings using the double-scattering approximation and the Monte Carlo algorithm, respectively. The previous experimental observations are compared with the numerically determined matrix elements, showing a good agreement in both double-scattering model and Monte Carlo simulation. The symmetrical relations between the Mueller matrix elements are clarified.
TL;DR: In this article, hybrid features combing both high-frequency and low-frequency components of wavelet transform are applied to fingerprint of medicinal herbs, which are called fractal-wavelet features.
Abstract: In this paper, hybrid features combing both high-frequency and low-frequency components of wavelet transform are applied to fingerprint of medicinal herbs. Through the fingerprints of medicinal herbs by wavelet transform and the fractal dimensions, 13 features are obtained, which are called fractal-wavelet features. In this new approach, the information of each sample can be acquired to the maximum degree. These novel hybrid features have been applied to recognition of the different types of ginseng. Experiments have been conducted, and the result of recognition can match the real situation. Experiments indicate this method is better than the traditional ones. Copyright © 2007 John Wiley & Sons, Ltd.
TL;DR: In this article, the influence of heat transfer surface treatment on the formation of calcium sulphate deposit during flow boiling heat transfer was reported, where the surface of several test heaters was treated by surface modification techniques, such as dynamic mixing magnetron sputtering and polishing to reduce surface energy.
Journal Article•
TL;DR: LiCoO2 thin films were characterized by various methods such as XRD, SEM and AFM as discussed by the authors, and the effect of the annealing temperature on the structure, the surface morphology and the electrochemical properties of the films were investigated.
TL;DR: In this article, the capacity fading of LiCr0.1Mn1.9O4/MPCF cells was investigated at elevated temperature (55 °C) and the cells showed very fast capacity fading, keeping only 60% of capacity retention at the 100th cycle at 55 °C.
Abstract: Capacity fading of LiCr0.1Mn1.9O4 /MPCF (mesophase pitch-based carbon fiber) cells was investigated at elevated temperature (55 °C). The cells showed very fast capacity fading, keeping only 60% of capacity retention at the 100th cycle at 55 °C. The cycled electrodes and the electrolyte were analyzed using electrochemical test, inductively coupled plasma, and X-ray diffraction. Results of the analyses indicated that LiCr0.1Mn1.9O4 exhibited good effects on restraint of Mn dissolution and stabilization of structure at 55 °C. The cycled LiCr0.1Mn1.9O4 electrode and the cycled MPCF electrode presented good electrochemical performance again with fresh electrolyte. Therefore, it was proposed that the cycling fading of LiCr0.1Mn1.9O4/MPCF cells was mainly caused by decomposition of electrolyte upon LiCr0.1Mn1.9O4 electrode during cycling. It was found that the decomposition of electrolyte led to the formation of a surface layer comprised of Li2CO3, Li
x
PF
y
, CH3OCO2Li or (CH2OCO2Li)2, polymeric ether etc. The formation of this film consumed active lithium ions, leading to fast capacity fading of LiCr0.1Mn1.9O4/MPCF cell at elevated temperature.
09 Jun 2006
TL;DR: In this paper, two longitudinal modes whose polarizations are orthogonal to each other can appear in the resonant cavity of He-Ne laser cavity 140mm long with the heater wrapped on it.
Abstract: The two longitudinal modes whose polarizations are orthogonal to each other can appear in the resonant cavity ofHe-Ne laser cavity 140mm long with. The both modes compete each other. Controlling the resonant cavity length,the heater wrapped on it enhances the output power of the weakening mode so as to stabilize the frequencies of theboth modes. The intracavity laser includes a laser resonant cavity, a heater, an analyzer, a polarized spectroscope,and two detectors. The voltage multiplying rectifier circuit is designed for the laser power. When the frequencies ofthe both modes are stable, the positive duty of the output pulse of the comparator is 50%. With the beat frequencymethod, the frequency stability of this laser is tested for 2x 10b0. The laser using this method has a lot of particularadvantages that other methods do not possess, such as no piezocrystal or magnetic field.Keywords: Double longitudinal mode, voltage multiplying rectifier, frequency stabilization, duty 1. INTRODUCTION
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TL;DR: The correlation analysis showed that the spectrum from a morphological element is highly correlated with that from the corresponding purified chemical and the Raman microspectroscopic model of human breast tissue is designed.
Abstract: Breast tissue sections were examined by means of confocal Raman spectroscopy with an excitation wavelength of 633 nm. Acquired using a microscopic mapping approach with the sample volume of -2 microm3, these spectra were compared with the ones of the commercially available actin, DNA, collagen (type I), triolein etc. Some spectra were distinguished and identified and characterize the morphological elements like cell cytoplasm, extracellular matrix etc. The cell nucleus spectrum was also obtained by K-means cluster analysis. The correlation analysis showed that the spectrum from a morphological element is highly correlated with that from the corresponding purified chemical. The spectroscopic characterization of these morphological elements was then investigated. This study is helpful to understanding the chemical/morphological basis of the Raman spectrum and designing the Raman microspectroscopic model of human breast tissue.
Journal Article•
TL;DR: The results of the experiments show that air table can effectively separate electronic scrap in size of 2.8~0.25 mm of mixture material and different granularities as discussed by the authors.
Abstract: Systemic studies of recycling discarded printed circuit board (PCB) by mechanical technology and separation mechanism of air table by density have been made, with chosen PCB from electronic waste and discarded printed wire boards. The results of the experiments show that air table can effectively separate electronic scrap in size of 2.8~0.25 mm of mixture material and different granularities. With more than 70 % of Cu, Fe and alloy recycled, the metal content of heavy product amounts to 59.48%. With 78.57 % recovery, the resin and plastic content in light product is 85.51 %. It brings good results to separate 1.2~0.5 mm PCB, metal content is 84.87%,recovery is 94.64 %.
Journal Article•
TL;DR: A series of MoP/γ-Al_2O_3 catalysts with loadings of 5%~20% were prepared by direct reduction of the corresponding molybdenum phosphate precursors as discussed by the authors.
Journal Article•
TL;DR: In this article, a macro-porous sulfonic resin CT175 supported AlCl3 by gas-phase immobilization was used as a catalyst for the alkylation reaction of methyl-substitution thiophenic sulfur as model sulfur compounds with iso-butene as an alkylating agent.
Abstract: Most of sulfur compounds (especially methyl-substitution derivatives of thiophene) exist in the temperature range higher than 110℃ boiling point fraction of FCC gasoline. A desulfurization method is proposed for the removal of sulfur compounds from FCC gasoline by alkylation reaction of thiophenic sulfur with olefins over acid catalysts, and the higher boiling sulfur-containing products are removed by fractional distillation. A macro-porous sulfonic resin CT175 supported AlCl3 by gas-phase immobilization was used as a catalyst for the alkylation reaction of methyl-substitution thiophenic sulfur as model sulfur compounds with iso-butene as an alkylating agent, and the AlCl3CT175 resin catalyst showed that an excellent catalytic activity was achieved, and the thiophenic sulfur compounds (containing 2033 μg/g of 2-methylthiophene, 2045 μg/g of 3-methylthiophene and 1543 μg/g of 2,5-dimethylthiophene in benzene) were converted completely into higher boiling point multi-alkylthiophenic products under the reaction conditions of 80℃, atmospheric pressure, volume flow rate of iso-butene (iso-butene/N2 1:1, molecular ratio) 5.0 mL/min and WHSV 2.5 h1. Simultaneously, the catalytic activity stability of AlCl3CT175 was tested, as a result, more than 99.7% conversion rate was obtained and the alkylating activity had a good stability in the period of 700 h.
Journal Article•
TL;DR: In this article, an orbit pipeline welding robot has been developed to solve the problem of automatic welding during pipeline construction in the fields, which is easy with low cost that is fit for fieldwork and worker in our country,guarantees the welding quality and improve working efficiency.
Abstract: An orbit pipeline welding robot has been developed to solve the problem of automatic welding during pipeline construction in the fields.Its key techniques consist of developing a new type of travel unit,welding torch as cillating unit,robot orbit and intelligent control system etc.The development work of the orbit pipeline welding robot mechanic system is introduced in the paper.The main illustration is about the system's structure,action principle,key points of design and machining technics and verifying calculation for selecting reduction gearbox with the wire feeder motor and the diameter of the wire-feed wheel.The application in fieldwork shows that the robot can travel along the orbit stably and reliably and carry through all-position welding.The welding is easy with low cost that is fit for fieldwork and worker in our country,guarantees the welding quality and improve working efficiency.
09 Jun 2006
TL;DR: In this article, a closed-loop feedback design was proposed to ensure the movable reflector to move at a constant speed all the time, and the electronic signals of both the reference laser and an unknown laser were multiplied in frequency by PLL unit so as to enhance the resolutions of the wavemeter.
Abstract: The wavemeter can measure a wavelength of a tuned laser and an unknown laser. Due to the Doppler shift, the wavemeter operates and establishes coherent interference fringes on the detectors according to the Michelson interference principle. The movable reflector of the wavemeter is driven by a voice-coin motor. The closed-loop feedback design can ensure the movable reflector to move at a constant speed all the time. The electronic signals of both the reference laser and an unknown laser are multiplied in frequency by PLL (Phase-Locked Loop) unit so as to enhance the resolutions of the wavemeter. PLL unit consists of NE564 and 74LS193. Finally, the counter including a MCU (microcontroller unit), two 8254 programmable times, and a LCD calculates the wavelength of the unknown laser.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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TL;DR: The robustness of the watermark image under different attacks such as JPEG compression, image rotation and guassian low-pass filtering is analyzed and the results demonstrate that the embedding scheme has good performance of robustness.
Abstract: Based on discrete fractional Fourier transfrom(DFRFT),a digital image watermarking method in fractional Fourier transform domain is proposed.The FRFT has signal representation property both in space and frequency domain.The original image and the wate-rmark is transformed with different orders to improve watermarking security.The watermark in DFRFT domain is added to the secondary visual important part of the original image.The robustness of the watermark image under different attacks such as JPEG compression,image rotation and guassian low-pass filtering is analyzed and the results demonstrate that the embedding scheme has good performance of robustness.
18 Dec 2006
TL;DR: The system architecture provides a distributed, interoperable and scalable environment that is intended to unify the multiplicity of approaches and technologies to spatial information system.
Abstract: The development of an open system is important to allow for future expansion of capabilities because of the proliferation of spatial data, systems and applications. In this paper, the system architecture provides a distributed, interoperable and scalable environment. It is intended to unify the multiplicity of approaches and technologies to spatial information system. The spatial model, focusing on the scalable representation, shared data space and effective verification, is a useful method for better simulation, visualization and analysis over space and time. Furthermore, the system offers services based on components or subsystems to facilitate the creation and extension of applications and information communities.