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Analysis of Shear Lag Effect of Steel and Concrete Composite Box Girders WANG Lian-guang， WAN Jiang Journal of Northeastern University Natural Science    2015, 36 (8): 1204-1208.   DOI: 10.12068/j.issn.1005-3026.2015.08.030 Abstract （963）   HTML    PDF（pc） （425KB）（8401）       Knowledge map    Save Based on the basic principle of warping displacement function setting， a series of parabolic warping displacement functions that meet the basic warping mode of concrete composite box girders were selected for the proposed approach. The energy variation principle was applied to establish the governing differential equations and corresponding natural boundary conditions in consideration of the effect of shear lag. Then the analytical solutions to typical simply supported composite girders under mid-span concentrated load were derived. The static calculation examples verified the rationality and applicability of selecting quadratic parabolic warping displacement functions. Meanwhile， the measured results and the analytical solutions were compared with the finite element calculations so as to confirm the effectiveness of the approach. The calculation formula based on energy principle can meet the practical needs in engineering and the calculation is simple. Reference | Related Articles | Metrics | Comments（0）

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LMP calculation on PJM power market and its trial in China Zhang, Rui-You (1); Han, Shui (2); Zhang, Jin-Zhu (3); Wang, Ding-Wei (1) Journal of Northeastern University    2005, 26 (11): 16-18.   DOI: - Abstract （2229）   HTML    PDF（pc） （153KB）（8201）       Knowledge map    Save For the pricing of power transmission/distribution in China, the PJM power market is introduced as a reference and studied, in which the locational marginal price (LMP) with no transmission loss taken into account is calculated according to the security constrained economic dispatch (SCED) based on de-power flow. To adapt the actual need, the constraints on the sum of transmitted power of multiple branches are added to the original PJM model, and the power transmission distributed factor (PTDF) matrix is proposed for branch sets. To test the efficiency of the proposed approach, a calculation trial has been done using a mathematical model of a 500 kV network. The results showed that the approach can provide correct signals to all parties on power market and manage well the costs due to congestion with the fixed transmission right (FTR) used together. Reference | Related Articles | Metrics | Comments（0）

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Tumor image fusion based on wavelet multiresolution decomposition Wang, Hong (1); Yang, Chun-Mei (2); Yuan, Zhen-Hua (3); Zhao, Hai-Bin (3) Journal of Northeastern University    2005, 26 (4): 238-241.   DOI: - Abstract （843）   HTML    PDF（pc） （209KB）（7015）       Knowledge map    Save A new image fusion technique is put forward using wavelet transform to decompose the multi-resolution signals from each and every image so as to fuse differently the subimages within different bandwidths at every resolution levels. Template matching is used in high-frequency domain to calculate the statistical average and mean square deviation in image display area, thus determining the proportion of information provided by source images in image fusion process. In low-frequency domain the fusion is carried out using averaging operator so as to keep on the background of image. Then, image fusion can be completed by wavelet transform. The technique proposed has successfully been used in CT image fusion for tumor diagnosis, and experimental results revealed that it is an efficient way to provide fused image more adaptable to human vision. Reference | Related Articles | Metrics | Comments（0）

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EEG signal amplifier design based on driven-right-leg technology Sun, Yu-Ge (1); Ye, Ning (1); Yu, Yan-Bo (1) Journal of Northeastern University    2010, 31 (6): 777-781.   DOI: - Abstract （1256）   HTML    PDF（pc） （546KB）（5998）       Knowledge map    Save A high-performance EEG signal amplifier was designed, where the differential amplifier circuit, driven-right-leg circuit and preamplifying parts in the designed amplifier can denoise the common-mode interference signals. With the EEG signal amplified by the preamplifier and 2-stage post-amplifier, two low-pass filters and two 50Hz traps were arranged reasonably in design to denoise the high/medium-frequency interference in EEG signal effectively, thus enabling the efficient EEG signal detection without shielded enclosure. Testing results showed that the performance of all parts of the amplifier comes up to the indices as required in design. The effectiveness of the design was proved by the real EEG signal sampled from the scalp of the detected person. Reference | Related Articles | Metrics | Comments（0）

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Efficient approach to image binarization Dong, Li-Ju (1); Yu, Ge (1) Journal of Northeastern University    2004, 25 (12): 1149-1152.   DOI: - Abstract （1036）   HTML    PDF（pc） （205KB）（5954）       Knowledge map    Save Unlike the usual way to find out automatically a threshold from image histogram, the image binarization is dealt with as an optimization problem where the best threshold could be found out by minimizing a weighted function of error sum of squares, with a fast iterative optimization algorithm given for the purpose. The new approach is compared with a most classic and commonly-used binarization method, and the result shows that the two methods are equivalent in view of either theoretical analysis or experimental data. However, our formulation relevant to the problem enables us to derive up a much more efficient algorithm available to more applications, especially to real-time video monitoring and tracking systems. Reference | Related Articles | Metrics | Comments（0）

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Improvement of Blood Pressure Measurement Based on ECG and PPG XU Jiuqiang， LIN Hongji， LI Han， ZHAO Hai Journal of Northeastern University Natural Science    2014, 35 (1): 33-37.   DOI: 10.12068/j.issn.1005-3026.2014.01.008 Abstract （1969）   HTML    PDF（pc） （970KB）（5764）       Knowledge map    Save According to feature point detection algorithm with large computation of blood pressure measurement based on ECG and PPG， a feature point detection algorithm was proposed based on an improved difference method. The efficiency of the improved algorithm and the accuracy of the feature point detection had been largely improved. Through correlation analysis and regression analysis of the sampling data， the SBP(systolic blood pressure) had a strong correlation with PWTT(pulse wave transmit time)， but DBP(diastolic blood pressure) had a moderate correlation with PWTT. The experimental results indicated that using the improved algorithm， the PWTT could be calculated accurately， and then the SBP could be obtained. Also the deviation requirement could be met to noninvasive blood pressure measurement of AAMI. Reference | Related Articles | Metrics | Comments（0）

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AHP-based vendor evaluation in combination with FCE Zhang, Zhen (1); Yu, Tian-Biao (1); Liang, Bao-Zhu (2); Wang, Wan-Shan (1) Journal of Northeastern University    2006, 27 (10): 1142-1145.   DOI: - Abstract （1392）   HTML    PDF（pc） （376KB）（5081）       Knowledge map    Save To prevent the result of the vendor evaluation just by AHP from individual subjective judgment and favoritism, a new approach to vendor evaluation is proposed combining AHP with FCE. In the new approach AHP is used to determine the weights of evaluation indices for all vendors, while FCE is introduced to process the information relevant to vendor evaluation. A mathematical model is therefore developed for fuzzily comprehensive evaluation and it is used to evaluate several vendors for a certain automobile manufacturer. Reference | Related Articles | Metrics | Comments（0）

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- - Journal of Northeastern University    2004, 25 (6): 602-605.   DOI: - Abstract （798）   HTML    PDF（pc） （240KB）（4815）       Knowledge map    Save - Reference | Related Articles | Metrics | Comments（0）

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Tar Cracking Removal Technology in Biomass Gasification Process Xi-wen YAO, Qing-hua LIU, Hao-dong ZHOU, Kai-li XU Journal of Northeastern University(Natural Science)    2024, 45 (6): 890-896.   DOI: 10.12068/j.issn.1005-3026.2024.06.018 Abstract （1545）   HTML （30）    PDF（pc） （935KB）（4772）       Knowledge map    Save In order to grasp the research status and development of tar cracking technology during biomass gasification in recent years and aim at the production mechanism and thermochemical removal of tar during biomass gasification process， this study reviewed the characteristics of the gasification technology of different biomass gasifiers together with the characteristics of controlling the original emission of tar by means of literature research， summary and comparative analysis. The development of tar thermal cracking and catalytic cracking technology was analyzed， and the advantages and disadvantages of different tar cracking catalysts were compared and analyzed. The main direction of catalyst development was pointed out. The integration of tar catalytic cracking and physical removal （such as tar catalytic cracking， reforming， gas-liquid separation and electric tar capture） would be an effective approach to optimize the biomass gasification process. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Improvement and application of SERVQUAL service quality measurement method Xu, Xian-Ying (1); Ma, Qin-Hai (1) Journal of Northeastern University    2010, 31 (8): 1208-1212.   DOI: - Abstract （964）   HTML    PDF（pc） （1723KB）（4766）       Knowledge map    Save Some problems were found in the applications of SERVQUAL, such as the fuzziness of prospective target in the expected measurement which is unavailable to completely express what idea is expected, nonsense of gap computing and inappropriate model structure. A modified measurement model M-SERVQUAL was therefore developed instead of SERVQUAL to compute the gap between expectation and perception via the modified gap formula, i.e., (service perceived)-(target value)×(self-confidence level). Then, the different quality dimensionalities were combined with the service quality perceived in the model structure, where all the dimensionalities were measured in terms of response indices. A comparison between SERVQUAL and M-SERVQUAL was made empirically via structural equation, based on the data from the Shenyang International Horticultural EXPO 2006. The results showed that the M-SERVQUAL model has higher reliability, validity and goodness of fit. The M-SERVQUAL model was used to analyze the resource allocation and choice of marketing strategies in management. Reference | Related Articles | Metrics | Comments（0）

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Implementation of Chinese WordNet Zhang, Li (1); Li, Jing-Jiao (1); Hu, Ming-Han (1); Yao, Tian-Shun (1) Journal of Northeastern University    2003, 24 (4): 327-329.   DOI: - Abstract （1096）   HTML    PDF（pc） （216KB）（4545）       Knowledge map    Save An approach based on transformation from WordNet to Chinese WordNet is proposed. The system of the Chinese WordNet has been implemented. Some rules for synset's translating arid some methods for reconstituting relation between Chinese word form and word meaning are given. The feasibility and relative problems of the Chinese WordNet are discussed. A self-disambiguation algorithm for the transformation of concept nodes is prescribed. Reference | Related Articles | Metrics | Comments（0）

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On the influencing factors on H3BO3 recrystallization Gong, Dian-Ting (1); Li, Feng-Hua (1); Fan, Zhan-Guo (1); Liu, Su-Lan (1) Journal of Northeastern University    2008, 29 (12): 1734-1737.   DOI: - Abstract （1290）   HTML    PDF（pc） （225KB）（4521）       Knowledge map    Save Discusses emphatically some influencing factors on the recrystallization of H3BO3, such as the solution concentration, crystallization temperature/time and stirring speed in the solution of H3BO3-H2O system. The rate of crystallization can be up to over 88% if the crystallization temperature/time is constant and the boric acid concentration is controlled within 28.5%~31.0%. And if the crystallization temperature is selected in the range of 5~10°C, the different cooling ways all effect slightly the crystallization rate of boric acid. But, if a quenching is implemented during high temperature with the temperature cooled to a certain extent and then cooled slowly, most of boric acid crystals are provided with a certain grain size. In our lab the proper crystallization time is about 15 h. If the boric acid solution concentration is 28.5%, and final crystallization temperature is 10°C that is held for 15 h, the slow stirring speed benefits the formation of boric acid crystals. Reference | Related Articles | Metrics | Comments（0）

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Influence of three cosolvents on hydrolysis of tetraethyl-orthosilicate Huo, Yu-Qiu (1); Zhai, Yu-Chun (1); Tong, Hua-Nan (1) Journal of Northeastern University    2004, 25 (2): 133-135.   DOI: - Abstract （1380）   HTML    PDF（pc） （182KB）（4456）       Knowledge map    Save Investigates the influence of such cosolvents as n-butanal, isopropanol and ethanol on the reaction time and yield in the precipitation process and sol-gel process of tetraethyl-orthosilicate hydrolysis. The structure and morphology of powdered SiO2 were studied by TEM and FT-IR. The results showed that the reaction time decreases and yield increases with the increase in alkyl chains during either precipitation process or sol-gel process. In addition, the structure of powdered SiO2 obtained from either process are the same, but the particle sizes of SiO2 powder obtained from different hydrolysis process in which different cosolvents are used are different, ie. Using the cosolvents n-butanol and isopropyl can form smaller particle size than using ethanol. Reference | Related Articles | Metrics | Comments（0）

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Progress and Application of Intelligent Manufacturing Technology Ya-dong GONG, Jia-hao GAO, Li-ya JIN, Heng ZHAO Journal of Northeastern University(Natural Science)    2025, 46 (7): 84-93.   DOI: 10.12068/j.issn.1005-3026.2025.20250053 Abstract （1295）   HTML （43）    PDF（pc） （4156KB）（4291）       Knowledge map    Save Based on an analysis of the extensive and profound impact of the development of artificial intelligence on manufacturing technology， it is expounded that intelligent manufacturing is the main direction for building a strong manufacturing country， and its important roles are discussed in the construction of a new industrialization system. Through an introduction to intelligent manufacturing empowerment technology， it is claimed that intelligent manufacturing technology by the deep integration of intelligent technology and advanced manufacturing technology will drive the progress of the new round of industrial revolution and industrial transfor-mation. Subsequently， typical research results and application examples of intelligent manufacturing are used to clarify the essential differences and engineering applications between intelligent manufacturing and traditional automation. Finally， it is pointed out that the advanced production mode of the deep integration of new generation information technology and advanced manufacturing technology demonstrates a new form of future manufacturing industry. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Uniform design of initial population and operational parameters of genetic algorithm He, Da-Kuo (1); Wang, Fu-Li (1); Jia, Ming-Xing (1) Journal of Northeastern University    2005, 26 (9): 828-831.   DOI: - Abstract （929）   HTML    PDF（pc） （254KB）（4089）       Knowledge map    Save Based on the study on how to set the initial population and operational parameters of operators, a conclusion can be drawn that distribution of the initial population and the selection of operational parameters of operators directly concerns global convergence and searching efficiency of genetic algorithm. The reasonable setting of initial population and operational parameters is an important problem in the application of genetic algorithm to performing optimization calculation. At the same time, the initial population of genetic algorithm must reflect the information on solution space scientifically. During the setting of operational parameters attention must be paid to both diversity and fastness to coordinate them well. Based on optimization design theory, a method is proposed to establish initial population and operational parameters simultaneously by uniform design. A simplified calculation method is thus proposed using equivalent principle of uniform design to obtain uniform initial population. Simulation results show that the method is feasible and effective. Reference | Related Articles | Metrics | Comments（0）

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Equilateral triangle localization algorithm based on average RSSI Zhu, Jian (1); Zhao, Hai (1); Sun, Pei-Gang (1); Bi, Yuan-Guo (1) Journal of Northeastern University    2007, 28 (8): 1094-1097.   DOI: - Abstract （894）   HTML    PDF（pc） （332KB）（4084）       Knowledge map    Save To get high precision of localization in WSNs (wireless sensor networks), an equilateral triangle localization algorithm based on average RSSI is brought up, taking account mainly of the measurement precision and improvement of the distribution of beacon nodes. This algorithm presents two concepts: sensitive region and insensitive region of RSSI. It introduces Gauss model to deal with the RSSI which is got from in sensitive region, then the problem that RSSI is easy to be interfered is resolved. And the equilateral triangle distribution model is used to deal with the distribution of beacon nodes to ensure that the tracks of unknown nodes are always kept within the insensitive region, thus improving the measurement precision. A conclusion is drawn that the Gauss model can screen out the first-class RSSI well and the equilateral triangle distribution model can improve the acquisition precision. This algorithm is easy to implement and no communication expense and extended hardware are required. Reference | Related Articles | Metrics | Comments（0）

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Effect of Lime on Digestion of Gibbsitic Bauxites at Low Temperature PAN Xiaolin， YU Haiyan， TU Ganfeng， BI Shiwen Journal of Northeastern University    2013, 34 (4): 551-555.   DOI: - Abstract （1215）   HTML    PDF（pc） （684KB）（4007）       Knowledge map    Save The effects and function mechanism of the different amount of lime additions on the digestion properties of three kinds of gibbsitic bauxites obtained from abroad were investigated at 145℃. All the gibbsitic bauxites are comprised of gibbsite， aluminogoethite， hematite， kaolin， quartz as well as minor anatase and boehmite characterized by XRD. The results showed that the lime addition promoted the desilication reactions， which decreased the concentrations of alumina and silica of digested sodium aluminate liquor. The corresponding silica index increased gradually and the alumina digestion rates of gibbsitic bauxites decreased linearly with the increase of the mass fraction of the lime. The conversion of desilication products from sodium silicon aluminum hydrate to hydrogarnet was also promoted by the addition of lime. The concentration of caustic alkali increased and the mass fraction of the alkali in the red mud decreased gradually with the increase of the mass fraction of the lime. Reference | Related Articles | Metrics | Comments（0）

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Surface Deformation Monitoring and Mining Parameters Inversion of Puhe Coal Mine Goaf Based on DS-InSAR Meng AO, Ying SUN, Lian-huan WEI, Hua-nan ZHANG Journal of Northeastern University(Natural Science)    2024, 45 (6): 866-873.   DOI: 10.12068/j.issn.1005-3026.2024.06.015 Abstract （1297）   HTML （14）    PDF（pc） （2652KB）（3994）       Knowledge map    Save Interferometic synthetic aperture radar （InSAR） technology has shown great application potential in monitoring geological disasters in mining areas. However， it is difficult for conventional time?series InSAR technology to detect enough radar targets in mining areas covered by vegetation， which causes underestimation or inaccurate estimation of deformation results. Aiming at the scarcity of measurement points in complex mining areas， the distributed scatterer InSAR analysis method can effectively increase the number of measurement points in the vegetation covered area， thereby accurately describing the temporal evolution and spatial distribution characteristics of deformation in mining areas. The long?term and high?intensity mining activities will cause the surface deformation of the goaf， posing serious threats to sustainable mining， infrastructure construction and the safety of lives and property. In order to understand the mining situation in the goaf of Puhe Coal Mine in Shenyang， based on InSAR high?precision monitoring data， the key underground mining parameters in the mine area are obtained through geophysical modeling inversion. The deformation field simulated based on the optimal parameters is consistent with the InSAR monitoring results， and the inversion mining parameters conform to the actual mining situation. Combining InSAR monitoring results with Okada model to invert mining area parameters can truly reflect the actual mining situation， accurately describe the surface deformation of goaf， and provide important information for scientific formulation of underground mining plans and sustainable development of the mining area. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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CUDAbased Acceleration Algorithm of SIFT Feature Extraction WANG Beilei， ZHU Zhiliang， MENG Lu Journal of Northeastern University    2013, 34 (2): 200-204.   DOI: - Abstract （1861）   HTML    PDF（pc） （1048KB）（3946）       Knowledge map    Save A novel algorithm for accelerating scaleinvariant feature transform (SIFT) was presented on the basis of compute unified device architecture (CUDA)， which could solve the timeconsuming problem in SIFT feature extracting. This algorithm took the advantages of graphic processing unit (GPU) in parallel computation， float point computation and memory management， and reasonably allocated the computational resources and the corresponding computational tasks to the host and device in the SIFT feature extracting. Experimental results show that， compared with the CPUbased acceleration algorithm， the proposed CUDAbased algorithm greatly speeds up the extracting of SIFT features. The acceleration ratio increases with the number of SIFT feature points. The maximum acceleration ratio in the experiments was 1954. Reference | Related Articles | Metrics | Comments（0）

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Preparation of low Na/K highly purified LiCl by alcohol extraction Jin, Zhe-Nan (1); Li, Xi-Meng (1); Lan, Wei-Jun (1); Liu, Xiu-Ru (1) Journal of Northeastern University    2006, 27 (11): 1251-1254.   DOI: - Abstract （559）   HTML    PDF（pc） （185KB）（3838）       Knowledge map    Save Based on the different of solubilities of alkali metal chlorides in alcohol, the highly purified lithium chloride with low sodium/potassium contents was prepared for the first time by alcohol extraction process. The results showed that calcium content in mass fraction can be controlled lower than (10-15) × 10-6 after decalcification by adding 0.6% lithium oxalate, meanwhile, the sodium and potassium contents can be lower than 40 × 10-6 and 5 × 10-6, respectively, when filtering the solution 2 times and the liquid to solid ratio 8.5. Such a result means that the alcohol extraction is an effective way to remove sodium and potassium in preparing highly purified lithium chloride. Reference | Related Articles | Metrics | Comments（0）