Volume 35,Issue 3,2012 Table of Contents

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  • 1  Meshing performance analysis of planar internal gear enveloping crown worm driving
    CHEN Yong hong ZHANG Guang hui CHEN Bing kui LUO Wen jun
    2012, 35(3):1-7. DOI: 10.11835/j.issn.1000-582X.2012.03.001
    [Abstract](1322) [HTML](0) [PDF 3.06 M](915)
    Abstract:
    A new worm driving,i.e. planar internal gear enveloping crown worm driving,is presented. Its mathematical model of meshing functions and teeth surface equations are established basing on the theory of differential geometry and gear mesh. Various types of the driving,the macroscopic meshing performance and the microcosmic meshing performance are analyzed. The results show that the inclination angle of generating plane determines the distribution of contact lines,the planar internal gear primary-enveloping crown worm driving has ideal lubrication property,and the planar internal gear second-enveloping crown worm driving has high loading capacity. The studies are practicably instructive for developing new worm driving with high loading capacity,ideal lubrication and small volume.
    2  Hardware in the loop test for plug-in hybrid electric vehicle
    YE Ming SHU Hong LIU Yong gang
    2012, 35(3):8-13. DOI: 10.11835/j.issn.1000-582X.2012.03.002
    [Abstract](1128) [HTML](0) [PDF 4.50 M](944)
    Abstract:
    Mathematical modes of engine,cooperation of motor and batteries,automatic clutch and vehicle are built with analysis of configuration of plug-in hybrid electric vehicle (PHEV). Specifications of data input and output and signal characters are defined. Hardware in the loop (HIL) system based on MATLAB/xPC for PHEV is built up. The motor/engine drive shift control logic test of PHEV is carried with inputting real acceleration pedal data. Testing results show that automatic clutch acts abnormally. Bugs in control logic are found out. Road test results with revised control logic are very good.
    3  The key technology research of on-line surface inspection for hot heavy rail
    XIE Zhi jiang CHEN Tao CHU Hong yu LIU Qin
    2012, 35(3):14-19. DOI: 10.11835/j.issn.1000-582X.2012.03.003
    [Abstract](910) [HTML](0) [PDF 2.75 M](950)
    Abstract:
    To overcome the detection difficulties of the surface defects when milling a hot heavy rail,a suite of detection system for on-line surface defect is developed. To select optical environment according to radiation of heavy rail and characteristics of light,use multi-linear array CCD cameras to parallel multi-angle collect images of whole surface of hot heavy rail,and obtain images through an image adaptive preprocessing to meet requirements of defect detection. For the condition that the defects extracting causing by continuity of the surface defects of hot heavy rail is hard to realize through traditional image segmentation, an examining algorithm of image relevance between pixel lines is proposed, using pixel de-differentiation and statistical variance operations to extract defect. This algorithm is demonstrated to be better than traditional edge detection,and the system has achieved good results in the practical application of a rail beam plant.
    4  The method for removing the spurious modes of eigensystem realization algorithm
    ZHANG Guo wen TANG Bao ping PAN Fei
    2012, 35(3):20-25. DOI: 10.11835/j.issn.1000-582X.2012.03.004
    [Abstract](1454) [HTML](0) [PDF 2.79 M](1154)
    Abstract:
    Due to the influence of spurious modes on the eigensystem realization algorithm results,singular value decomposition(SVD) and model energy level are introduced to remove the spurious modes of eigensystem realization algorithm,reduce part of the noise modes and improve the accuracy by reducing measurement noise by SVD. The energy matrix of each mode can be calculated by the selection matrices,the eigenvalues and eigenvectors of the state matrix and the input distribution matrix. The largest singular value of the energy matrix obtained by SVD is a measure for the energy contribution of each mode,which is named mode energy level. Spurious modes resulting from noise or model redundancy are indicated according their mode energy level. A numerical example and an experimental example are presented to demonstrate the efficacy of the method.
    5  Dynamic analysis of high speed motorized spindles with eccentrics
    CHEN Xiao an CHEN Wen qu KANG Hui min HE Ye
    2012, 35(3):26-32. DOI: 10.11835/j.issn.1000-582X.2012.03.005
    [Abstract](1178) [HTML](0) [PDF 2.19 M](925)
    Abstract:
    In order to study dynamic behaviors of high speed motorized spindles under different eccentric conditions,the dynamics of high speed motorized spindles is analyzed by using finite element method on the basis of its structure,and an analytical dynamic model of high speed motorized spindles is established. Based on electromagnetism and mechanical system dynamics,expressions of general unbalanced force of high speed motorized spindles are established. Thus,dynamic characteristics of spindles,such as natural frequencies and unbalance response,can be obtained from the proposed model while spindles have different preloads and bearing configurations. The parameters of a 120MD60Y6 motorized spindle are substituted into the model and a simulation is carried out by Matlab/Simulink. The result shows good agreement with the data obtained from experimental modal analysis,which proves that the proposed model is correct.
    6  Product family configuration-oriented constraint network model and configuration
    DONG Yuan fa GUO Gang FU Hao SUN Min
    2012, 35(3):33-39. DOI: 10.11835/j.issn.1000-582X.2012.03.006
    [Abstract](987) [HTML](0) [PDF 3.93 M](928)
    Abstract:
    Concepts of requirement elements and configuration elements and the model of customer requirements family are proposed for the configuration problem of product family. The constraint relationships are taken into account to establish a feature attribute mapping-based constraint network,which is between configuration elements,as well as requirement element and configuration element. The scale of the configuration problem solving has been reduced through the ordinal constraint diffusion that according to the weight of requirement elements,and also through the range reduction of configuration element related to requirement element by pretreatment. The set of rapid configuration results is obtained by constraint solving for undetermined configuration element,applied the non-binary uniformity backtracking algorithm. Ultimately the feasibility of the proposed approach is validated by means of an example of a chassis configuration design.
    7  Design of nondestructive test system for plasma clots
    CHEN Li li LIAO Qiang YANG Zheng shu HU Xue ZHANG Guo zhen
    2012, 35(3):40-46. DOI: 10.11835/j.issn.1000-582X.2012.03.007
    [Abstract](1174) [HTML](0) [PDF 3.23 M](923)
    Abstract:
    One of the most important measures that are used to guarantee blood transfusion safety is to detect clots in the plasma before transfusion. To overcome the disadvantages of manual detection method, this research designs a nondestructive testing (NDT) system for plasma clots inspection based on machine vision technique and artificial neural networks. The key technology for system design are studied and presented. Image acquisition is performed by custom-designed software based on MATLAB platform, and the methods of image cut, reverse color, median filter as well as gray cutting are adopted to preprocess image. The use of fisher discrimination method, combined with iterative threshold segmentation method and the selection of connected domain, can successfully eliminate the interference of air bubble and correctly extract the image of plasma clots. Plasma clots are discriminated by a recognition model based on artificial neural network BP algorithms. The results of clinical contrast experiment shows that the system can effectively detect whether plasma contains plasma clots and the new system shows a much higher degree of repeatability and stability. From the image acquisition and processing to the recognition of plasma clots, the detecting time of a sample is no more than 1 min.
    8  Effect of surface defects on anodic oxidation coating of7075 aluminum alloy
    HUANG Zhi tao TIAN Wen huai
    2012, 35(3):47-51. DOI: 10.11835/j.issn.1000-582X.2012.03.008
    [Abstract](1217) [HTML](0) [PDF 3.75 M](930)
    Abstract:
    To study the effect of processing on anodization of 7075 high strength aluminum alloy, the aluminum anodic oxidation coating is prepared and the microstructure, surface morphology and the composition are analyzed by metallurgical microscope, stereomicroscope, scanning electron microscopy(SEM) and EDS. The results show that interruptions and cracks of the anodizing film appear in the surface near the precipitates; the anodizing film is thinner around the surface defects and there are cracks in the edge of sharp corners of it. It can improve the quality of the anodic film and meet the requirements of corrosion resistance by increase the surface degree of finish. The anodic oxidation coating is uneven or incomplete, which weakens the protection for the aluminum alloy substrate, due to the surface defect.
    9  Identification for the stable hot-working parameters of AZ80 magnesium alloy
    QUAN Guo zheng WANG Yang LI Gui sheng SHI Yu ZHOU Jie
    2012, 35(3):52-59. DOI: 10.11835/j.issn.1000-582X.2012.03.009
    [Abstract](776) [HTML](0) [PDF 6.50 M](802)
    Abstract:
    Several series of billet samples are compressed on physical simulation machine under deformation temperatures 523~673 K and strain rates 0.01~10 s-1, and the true stress-strain data collected result in the performance of calculations for strain rate sensitivity (m-value), power dissipation efficiency (η-value) and instability parameter (ξ-value). A series of 3D surfaces reveal the severe response of m-value to the evolution and coexisting of several deformation mechanisms induced by the enhanced effect of stress, temperature, strain rate and strain, from which the unstable deformation parameter regions are identified preliminarily. Furthermore, the maps of power dissipation efficiency are plotted, from which the unstable (η≤0) deformation parameter regions are indentified. Finally, based on the map of instability criterion, stable region (ξ>0), unstable region (ξ≤-1) and metastable region (-1<ξ≤0) are clarified clearly. According to the comprehensive identification, the stable deformation parameter regions with higher m-value level and higher η-value level and higher ξ-value level are recommended, while the unstable deformation parameter regions with negative m-value level and negative η-value level and negative ξ-value level should be avoided.
    10  Modeling and realizing of integrated batch planning for steelmaking-continuous casting and hot strip rolling
    LIU Yi ZHENG Zhong CHEN Kai GAO Xiao qiang
    2012, 35(3):60-66. DOI: 10.11835/j.issn.1000-582X.2012.03.010
    [Abstract](914) [HTML](0) [PDF 2.28 M](827)
    Abstract:
    An integrated batch planning mathematical model based on multi-object optimization is proposed to solve the orderly and efficient flow of material between different working stations in iron and steel enterprises, where production technology constraints, material variations and coupling between steelmaking-continuous casting and hot rolling are analyzed first. According to the requirements of the hot rolling steel strip contracts, the integrated batch planning is divided into sub-plans of rolling plan, casting plan and furnace plan which are independent and coupling to each other, forming rolling plan and furnace plan simultaneously to influence casting plan. Heuristic method based on modified co-evolutionary algorithm is advanced to resolve this problem. The results of simulation and analysis in an iron and steel plant for strip steel production shows that it is feasible to provide effective guidance for integrated batch plan making.
    11  Design and optimization of the precision rollforging on a heavy truck front axle
    ZHOU Jie LIU Hao LIU Xu guang WAN Xu yi SHE Ke neng
    2012, 35(3):67-73. DOI: 10.11835/j.issn.1000-582X.2012.03.011
    [Abstract](935) [HTML](0) [PDF 3.37 M](839)
    Abstract:
    The under-filling defect of I-beam in a heavy truck front axle which occurs in the process debugging of the precision roll-forging and die-forging is studied. Finite element models of precision roll-forging and die-forging are established based on FEM software and the previous productive results. Then, the mechanism of the under-filing defect in I-beam is studied. And the effects of the three variables including width B, radius R and slope A of I-beam in the third step on the forging quality are investigated. In addition, the roll-forging die constructions for I-beam in previous three steps are redesigned and manufactured. The productive results show that I-beam can be fully filled, the debugging cycle is reduced significantly and the products quality is guaranteed.
    12  Recognizing the reliability non-coherence components ofdistribution substation typical configuration
    JI Jing XIE Kai gui CAO Kan HU Bo
    2012, 35(3):74-80. DOI: 10.11835/j.issn.1000-582X.2012.03.012
    [Abstract](838) [HTML](0) [PDF 2.68 M](1212)
    Abstract:
    Reliability non-coherence components (RNC) may exist in a power system due to the effects of distribution substation connection modes, components reliability performance, load level, and other factors. Recognizing RNCs and removing them from a power system can improve system reliability. The reliability non-coherence phenomenon is analyzed and the reliability non-coherence probability, frequency and energy indices, which can describe the degree of the system reliability non-coherence feature, are proposed. Based on the reliability evaluation theory of substation configuration, recognizing technique of RNCs of distribution substation is proposed. The theoretical analysis and example show that the breaker connects high voltage buses may be the RNC when the rated capacity of one transformer can meet the load requirement, and the reliability parameters of breakers have some effects on the reliability non-coherence features of the typical substation configuration.
    13  Measurement of interharmonics in power network based on all phase FFT time shifting and phase difference
    WANG Xiao ping HUANG Xiang mei
    2012, 35(3):81-84. DOI: 10.11835/j.issn.1000-582X.2012.03.013
    [Abstract](1241) [HTML](0) [PDF 782.17 K](1180)
    Abstract:
    The harms brought by interharmonics have attracted people’s attention more and more. The research of interharmonics is based on the actual measurement of the interharmonics in power network. An interharmonics detection method of all phase fast Fourier transform (apFFT) time shifting and phase difference is proposed in order to overcome the defects of the bigger measurement error brought by traditional FFT algorithm. By adopting apFFT algorithm and adjusting sample rate, we suppress spectrum leakage of all 0.1 times integer time harmonics including fundamental. Frequency and amplitude corrections are obtained through main spectrum line phase difference. The apFFT main spectrum lines phase values without correction are directly taken as phase values. The concept is clear and the results are direct. The algorithm has the advantage of strong anti-interference between harmonics. The simulation results show that the proposed method can detect amplitude, phase and frequency of interharmonics with high precision. The algorithm provides a new effective way for power network interharmonic detection and analysis.
    14  Full bridge LLC series resonant converter for X-Ray high voltage DC power supply
    TANG Zhi de ZHANG Zheng mao YANG Hong YANG Bing SHU Zhi qiang
    2012, 35(3):85-91. DOI: 10.11835/j.issn.1000-582X.2012.03.014
    [Abstract](1265) [HTML](0) [PDF 3.07 M](1299)
    Abstract:
    To prevent the duty cycle loss of full-bridge converter controlled by the phase-shifting method, a high frequency high voltage X-ray power supply is proposed. It combines full bridge LLC(FB-LLC) series resonant converter with bipolar single-phase symmetrical voltage multiplier. FB-LLC series resonant, high voltage transformer and bipolar single-phase symmetrical voltage multiplier are used in the main circuit. The LLC series resonant circuit and working conditions of soft switch are analyzed. The fundamental harmonic approximation model is established. The parameters of the main circuit are designed. The simulation results show that the output voltage adjusted continuously within 40~120 kV and without duty cycle loss. The X-ray power supply is proposed to achieve a quick rise and low ripple of output voltage. According to the simulation results, the proposed topology is correct and reliable.
    15  Analysis of fast optimization algorithm for inverse detecting faulty insulators
    ZHANG Zhan long PENG Meng jie LI De wen ZHOU Jun TANG Ju FAN Kang lin
    2012, 35(3):92-97. DOI: 10.11835/j.issn.1000-582X.2012.03.015
    [Abstract](731) [HTML](0) [PDF 2.06 M](838)
    Abstract:
    In order to improve the computational efficiency of the insulator electric field inverse problem, the fast multi-pole method has been introduced to the traditional simulation charge method. Tikhonov regularization is used to process the ill-posed characteristic of inverse problem solution caused by the interference. Newton method is used to search the optimum solution, and then the actual field source parameters of insulators and the practical voltage distribution on the surface of the insulators can be obtained. The fast optimization algorithm has been verified in point charge model. And 110 kV insulator string is carried out to demonstrate that the fast optimization algorithm is much faster and more efficient than traditional method.
    16  The application research on improvement of constant sinusoidal signal sampling precision based on adaptive filter
    YIN Gang ab SI Rui qi LI Chang ming
    2012, 35(3):98-102. DOI: 10.11835/j.issn.1000-582X.2012.03.016
    [Abstract](1119) [HTML](0) [PDF 1.23 M](942)
    Abstract:
    A novel scheme is present to improve the conversion accuracy of ADC. The proposed approach uses adaptive sinusoidal filter. For the measurement of the signal with given frequency, the automatic adjustment of filter coefficients is based on least mean-square error rule, which is a mathematical tool can be employed to make filter output signal achieve the best approximation to the needed one. Then based on the result, it is able to get the amplitude and phase of the measured signal accurately. MATLAB software is used to verify the effectiveness of the algorithm. It proves that adaptive filter has improved the accuracy and signal-to-noise ratio of ADC, which is equal to increase the conversion digits.
    17  Analysis on mechanical properties evolution ofoutburst coal under cyclic loading
    ZHAO Hong bao YIN Guang zhi
    2012, 35(3):103-107. DOI: 10.11835/j.issn.1000-582X.2012.03.017
    [Abstract](744) [HTML](0) [PDF 2.48 M](920)
    Abstract:
    Briquette specimens made of outburst coal are taken as research objects, and both mechanical properties evolution under cyclic loading and law of hysteretic curve evolution under different loading level are studied. The results show that hysteretic loop is composed of load-unload curve when briquette specimens are studied under cyclic loading, and secondary hysteretic loop is produced from the second cycle. The area composed by hysteretic curve becomes smaller with the addition of cycle numbers. The relation between deformation response and loading level is very close. Load-unload curve of hysteretic curve is expressed by conic, and the change law of fitting parameters of conic is very regular with the addition of cycle numbers, but the regularity of the law with loading level isn’t very obvious; the minis sign of fitting parameters of conic is opposite.
    18  Correlation dimension analysis of AE sequence under failure process of gas-filled coal
    LIU Yan bao CAO Shu gang LI Yong GUO Ping ZHANG Zun guo
    2012, 35(3):108-114. DOI: 10.11835/j.issn.1000-582X.2012.03.018
    [Abstract](1063) [HTML](0) [PDF 3.82 M](1070)
    Abstract:
    The correlation dimension evolution characteristics of acoustic emission(AE) time-series during the instability and failure of coal with and without gas are analyzed base on fractal theory. The results show the coal rock’s AE time-series of deformation stages have obviously fractal characteristics under uniaxial loading. The processes of AE of deformation have different self-similarity, and the correlation dimension can describe the mechanical state of coal. During the triaxial loading process, the stress-varying trend of AE time-series of coal with and without gas is similar to the trend of AE correlation dimension. The sharp decrease of AE time-series’ correlation dimension can be considered as a “precursor” for failure. This feature doesn’t change with the change of confining pressure and gas pressure.
    19  Effects of transverse rotating magnetic field on thermocapillary flow under microgravity
    YAO Li ping ZENG Zhong ZHANG Yong xiang
    2012, 35(3):115-120. DOI: 10.11835/j.issn.1000-582X.2012.03.019
    [Abstract](978) [HTML](0) [PDF 3.04 M](814)
    Abstract:
    Semiconductor melt is electrically conducting, which makes it possible to apply magnetic fields to control the thermocapillary convection induced by surface tension in the floating zone under microgravity, and ultimately to control grown crystal quality. In the present paper, based on the comparison between the transverse static magnetic field and the rotating magnetic field(RMF), we focuses on the effects of RMF on thermocapillary convection. Results indicate that in the RMF, the induced Lorentz force is effective in stirring the melt in the azimuthal direction and suppressing axial convection, and both effects are beneficial for the three-dimensional melt convection returning to a steady axisymmetric flow. The RMF is a promising method for convection control in floating zone for semiconductor crystal growth.
    20  Extended theoretical analysis of jet and atomization under high-pressure spraying and collecting dust mechanism of droplet
    ZHOU Gang CHENG Wei min NIE Wen WANG Gang
    2012, 35(3):121-126. DOI: 10.11835/j.issn.1000-582X.2012.03.020
    [Abstract](1074) [HTML](0) [PDF 1.78 M](1200)
    Abstract:
    The atomization model about interaction of cavitation, turbulence and aerodynamics is put forward through the analysis about the control equation of jet disturbance, the computed result of the dispersive jet equation, according to the conceptual model of spray based on two-phase flow. The action of cavitation and turbulence formed inside nozzle are thought to lead to the first atomization near the nozzle exit, while the aerodynamic effect controls the following second atomization process. And the critical Weber number 〖BP(〗[We]=12(1+1.077Oh1.5)〖BP)〗 is taken as the judgment index for occurring of the second atomization or not. The critical velocity for liquid splitting into droplets is 60 m/s according to the analysis of break mode about liquid drop, furthermore, jet fragmentation and film fragmentation occurs in the first and second atomization respectively. The typical mechanism of dust capture by water-cloud is improved through the active collision theory of droplet to dust particle. It is considered that an optimal relationship exists between collection rate and droplet size when gas containing dust is unsaturated and its temperature is higher than that of liquid, moreover, low fluid velocity can be propitious to the collection of tenuous droplet to exiguous dust on the basis of the same liquid-gas ratio and the same quantity of droplets.
    21  Effects of different preparation methods onphotocatalytic activity of Fe3+/TiO2
    JI Fang ying HE Li ZHAO Yi XU Xuan WANG Xiao dong
    2012, 35(3):127-132. DOI: 10.11835/j.issn.1000-582X.2012.03.021
    [Abstract](864) [HTML](0) [PDF 2.95 M](836)
    Abstract:
    Two kinds of Fe3+/TiO2 catalysts are prepared by Sol-gel method and hydrolysis method. XRD, UV-Vis, BET, curves of N 2 adsorption-desorption and 3D fluorescence are used to analyze the structures and properties of the catalysts, and their photocatalytic activities are investigated through degradation of DBP. The results show that two kinds of catalysts are anatase TiO 2. The band gap of the Fe3+/TiO 2 catalysts prepared by Sol-gel and hydrolysis method are 2.6 eV and 3.2 eV respectively, and the former with an absorption edge at 477 nm, while the latter with no redshift. The curves of N 2 adsorption-desorption of the Fe3+/TiO 2 catalysts prepared by Sol-gel and hydrolysis method are type Ⅳ and Ⅴ, their BET specific surface areas are 57.03 m2/g and 10.94 m2/g, and the hysteresis loop of the latter shifts to the high relative pressure region with a smaller pore volume and a bigger average pore diameter. Two kinds of catalysts can reduce photoluminescence properties of TiO 2 at various degrees, and the catalyst prepared by Sol-gel method shows a weaker photoluminescence property. The results of degradation experiment show the degradation rate of DBP by catalyst prepared by Sol-gel method and hydrolysis method are 60.53% and 31.83% respectively after 2 h.
    22  Ventilation regulating methods adapting by climate for residential housing
    YU Wei LI Bai zhan ZHAO Wen jiang CHEN Jin hua LIU Meng
    2012, 35(3):133-139. DOI: 10.11835/j.issn.1000-582X.2012.03.022
    [Abstract](1202) [HTML](0) [PDF 4.44 M](884)
    Abstract:
    To study the climatic control strategies of the residential building indoor acceptable thermal environment, firstly, based on adaptive model, integrated indoor activities, clothes and spot investigation on air velocity of residential building, this paper calculates an acceptable temperature range. Secondly, through state-space techniques, common passive regulating technologies in residential building have been simulated, including different ventilation rates and divided-period setting ventilation effect on indoor temperature. Meanwhile, monthly regulating methods for ventilation have been proposed. Thirdly, through ventilation technology, effective regulating zone of outdoor climate parameters have been analyzed, which is combined with hythergraph of outdoor temperature, humidity, solar radiation and air velocity. Taking the characteristics of the human thermal comfort adaptability into consideration, the energy-saving potential of the study results is also analyzed.
    23  Influence of heat storage mode of domestic hot water on the performance of ground heat exchanger in ground-source heat pump system
    WANG Yong TANG Xi
    2012, 35(3):140-146. DOI: 10.11835/j.issn.1000-582X.2012.03.023
    [Abstract](881) [HTML](0) [PDF 3.28 M](940)
    Abstract:
    The vertical U-tube ground-coupled heat pump system provides cold and heat for the controlling of indoor environment. Under the air-conditioning condition, the vertical U-tube ground-coupled heat pump system with heat recovery can provide domestic hot water. The influence of supplying domestic hot water on the heat transfer performance of ground heat exchangers is different under different operating modes in summer and winter. Through a project design of ground-source heat pump system, the influence of supplying domestic hot water under heat storage mode on the heat transfer performance of ground heat exchangers in summer and winter is respectively analyzed. The dynamic performance of heat exchangers under different working conditions is analyzed, and through numerical calculation, the heat transfer performance parameters of ground heat exchangers under different operating modes are obtained. From the calculation results, the adjusting methods based on the load characteristics of this project represent.
    24  Recycling technology of substrate from 1,4-butanediol distillation
    WEI Shun an WANG Pan DONG Li chun TAN Shi yu YOU Xin qiang YANG Nan
    2012, 35(3):147-152. DOI: 10.11835/j.issn.1000-582X.2012.03.024
    [Abstract](929) [HTML](0) [PDF 2.15 M](842)
    Abstract:
    In the Reppe-technology process of producing 1,4-butanediol(BDO), a certain amount of viscous substrate is formed in the thin-film evaporator due to intramolecular aggregation of BDO. A process is proposed to recycle the substrate and reduce discharge. The substrate is hydrolyzed by H 2SO 4 solution at the conditions of mass fraction of H 2SO 4 is 15%, mass ratio of H 2SO 4 to the substrate is 1.3〖DK〗∶1.0, temperature is 150 ℃ and reaction time is 7 h. The results show that BDO based on the raw substrate can be feasibly recovered at the rate up to 39.1%.

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