Pub Date : 2017-02-28DOI: 10.11918/J.ISSN.0367-6234.2017.02.008
Shiyang Li, Li Wang, P. Kalita, F. Ma
{"title":"Numerical simulation of nitrogen and phosphorus vertical transportation in subsurface drainage area","authors":"Shiyang Li, Li Wang, P. Kalita, F. Ma","doi":"10.11918/J.ISSN.0367-6234.2017.02.008","DOIUrl":"https://doi.org/10.11918/J.ISSN.0367-6234.2017.02.008","url":null,"abstract":"","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44380357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-12-25DOI: 10.11916/j.issn.1005-9113.2016.06.007
Yan Dong, Yin Liang, L. Xiaowei, Jiang Wenning, Lv Qiuye
In this paper the design and implementation of sixth-order lowpass elliptic switched-capacitor filter (SCF) for interface circuit of Micro-Electro-Mechanical System (MEMS) sensor are presented. This work aims to lower total harmonic distortion (THD) without deteriorating other performances. After system design in Simulink, the filter is realized in transistor level and finally fabricated in Central Semiconductor Manufacturing Corporation (CSMC) 0.5 μm metal-oxide-semiconductor (CMOS) technology. Typical measured results are: it operates with 25:1 clock-to-corner frequency ratio and a 10 kHz maximum corner frequency. The maximum passband ripple is about 0.49 dB and the minimum stopband rejection is 40 dB for the temperature from -20 ℃ to 80 ℃. For the 250 kHz clock frequency setting, given the 1 kHz, -8 dBVrms input signal, the measured worst case THD is -64 dB. The active area of the chip is 2.8 mm 2 with 8 pads. The analog power dissipation is 10 mW from a 5 V power supply.
{"title":"Design of Sixth-Order Lowpass Elliptic Switched-Capacitor Filter","authors":"Yan Dong, Yin Liang, L. Xiaowei, Jiang Wenning, Lv Qiuye","doi":"10.11916/j.issn.1005-9113.2016.06.007","DOIUrl":"https://doi.org/10.11916/j.issn.1005-9113.2016.06.007","url":null,"abstract":"In this paper the design and implementation of sixth-order lowpass elliptic switched-capacitor filter (SCF) for interface circuit of Micro-Electro-Mechanical System (MEMS) sensor are presented. This work aims to lower total harmonic distortion (THD) without deteriorating other performances. After system design in Simulink, the filter is realized in transistor level and finally fabricated in Central Semiconductor Manufacturing Corporation (CSMC) 0.5 μm metal-oxide-semiconductor (CMOS) technology. Typical measured results are: it operates with 25:1 clock-to-corner frequency ratio and a 10 kHz maximum corner frequency. The maximum passband ripple is about 0.49 dB and the minimum stopband rejection is 40 dB for the temperature from -20 ℃ to 80 ℃. For the 250 kHz clock frequency setting, given the 1 kHz, -8 dBVrms input signal, the measured worst case THD is -64 dB. The active area of the chip is 2.8 mm 2 with 8 pads. The analog power dissipation is 10 mW from a 5 V power supply.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66565225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-12-25DOI: 10.11916/J.ISSN.1005-9113.2016.06.009
Xie Ran, Song Ting, Shi Peng, Zhao Yu-shan
A model-free adaptive control method is proposed for the spacecrafts whose dynamical parameters change over time and cannot be acquired accurately. The algorithm is based on full form dynamic linearization. A dimension reduction matrix is introduced to construct an augmented system with the same dimension input and output. The design of the controller depends on the system input and output data rather than the knowledge of the controlled plant. The numerical simulation results show that the improved controller can deal with different models with the same set of controller parameters, and the controller performance is better than that of PD controller for the time-varying system with disturbance.
{"title":"Model-free Adaptive Control for Spacecraft Attitude","authors":"Xie Ran, Song Ting, Shi Peng, Zhao Yu-shan","doi":"10.11916/J.ISSN.1005-9113.2016.06.009","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.06.009","url":null,"abstract":"A model-free adaptive control method is proposed for the spacecrafts whose dynamical parameters change over time and cannot be acquired accurately. The algorithm is based on full form dynamic linearization. A dimension reduction matrix is introduced to construct an augmented system with the same dimension input and output. The design of the controller depends on the system input and output data rather than the knowledge of the controlled plant. The numerical simulation results show that the improved controller can deal with different models with the same set of controller parameters, and the controller performance is better than that of PD controller for the time-varying system with disturbance.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66565300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-25DOI: 10.11916/J.ISSN.1005-9113.2016.05.010
Liu Shuli, Zhang Guangming, Zhang Jie
In order to enhance the degrading protein capability of purple non-sulfur bacteria (PNSB), an effective strain, L2, was used to co-culture with Rhodobacter sphaeroides ATCC17023. The effects of added strain on protein removal of R. sphaeroides were investigated. Results showed that strain L2, being identified as Bacillus thuringiensis / cereus , had a high potential for producing protease with a production of 295 U/mL.The optimal B. thuringiensis / cereus (40 μL) could significantly increase protein degradation of R. sphaeroides . Protein removal and biomass production were improved by 483% and 67%, respectively. R. sphaeroides /total biomass production was more than 95%. Theoretical analysis revealed that R. sphaeroides syntrophically interacted with B. thuringiensis / cereus . Protein degradation of B. thuringiensis / cereus provided small molecule substrates (VFAs) for R. sphaeroides growth and cells materials synthesis.
{"title":"Isolation, Identification of Bacillus Thuringiensis/ Cereus and Its Enhancement on Protein Wastewater Treatment by Rhodobacter Sphaeroides","authors":"Liu Shuli, Zhang Guangming, Zhang Jie","doi":"10.11916/J.ISSN.1005-9113.2016.05.010","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.05.010","url":null,"abstract":"In order to enhance the degrading protein capability of purple non-sulfur bacteria (PNSB), an effective strain, L2, was used to co-culture with Rhodobacter sphaeroides ATCC17023. The effects of added strain on protein removal of R. sphaeroides were investigated. Results showed that strain L2, being identified as Bacillus thuringiensis / cereus , had a high potential for producing protease with a production of 295 U/mL.The optimal B. thuringiensis / cereus (40 μL) could significantly increase protein degradation of R. sphaeroides . Protein removal and biomass production were improved by 483% and 67%, respectively. R. sphaeroides /total biomass production was more than 95%. Theoretical analysis revealed that R. sphaeroides syntrophically interacted with B. thuringiensis / cereus . Protein degradation of B. thuringiensis / cereus provided small molecule substrates (VFAs) for R. sphaeroides growth and cells materials synthesis.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66565033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-25DOI: 10.11916/J.ISSN.1005-9113.2016.05.012
Ge Zhang, Dilei Chen, Ying-Jong Hong, Li Liu
In order to investigate the mechanism of the temperature oscillation in loop heat pipes, this paper investigated the movement of the phase interface as the changed input power by a mass-spring-damper model. The model was solved with MATLAB and was used to explain the high-frequency and low-amplitude temperature oscillation. Temperature variation with the input power from 20 W to 75 W was investigated based on a LHP prototype in a literature. The model agreed well with the experimental data in the literature. The simulation results suggested that the movement of the liquid column was caused by the fluctuation of pressure difference applied on the liquid column and the stiffness coefficients of the vapor springs increasing with the input power. According to parameter analyses, the temperature oscillation at the outlet of the condenser can be weakened by increasing the mass of the liquid column and keeping the temperature at the outlet of the condenser steady.
{"title":"Mass-Spring-Damper Model with Steady State Parameters for Predicting the Movement of Liquid Column and Temperature Oscillation in Loop Heat Pipe","authors":"Ge Zhang, Dilei Chen, Ying-Jong Hong, Li Liu","doi":"10.11916/J.ISSN.1005-9113.2016.05.012","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.05.012","url":null,"abstract":"In order to investigate the mechanism of the temperature oscillation in loop heat pipes, this paper investigated the movement of the phase interface as the changed input power by a mass-spring-damper model. The model was solved with MATLAB and was used to explain the high-frequency and low-amplitude temperature oscillation. Temperature variation with the input power from 20 W to 75 W was investigated based on a LHP prototype in a literature. The model agreed well with the experimental data in the literature. The simulation results suggested that the movement of the liquid column was caused by the fluctuation of pressure difference applied on the liquid column and the stiffness coefficients of the vapor springs increasing with the input power. According to parameter analyses, the temperature oscillation at the outlet of the condenser can be weakened by increasing the mass of the liquid column and keeping the temperature at the outlet of the condenser steady.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66565118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-25DOI: 10.11916/J.ISSN.1005-9113.2016.05.001
Sun Tiezhi, Wei Ying-jie, Wang Cong
The objective of this study is to analyze the fundamental characteristics and the thermodynamic effects of cavitating flows in liquid hydrogen. For this purpose, numerical simulation of cavitating flows are conducted over a three dimensional hydrofoil in liquid hydrogen. Firstly, the efficiency of this computational methodology is validated through comparing the simulation results with the experimental measurements of pressure and temperature. Secondly, after analysing the cavitating flows in liquid hydrogen and water, the characteristics under cryogenic conditions are highlighted. The results show that the thermodynamic effects play a significant role in the cavity structure and the mass transfer, the dimensionless mass transfer rate of liquid hydrogen is much larger, and the peak value is about ninety times as high as water at room temperature. Furthermore, a parametric study of cavitating flows on hydrofoil is conducted by considering different cavitation number and dimensionless thermodynamic coefficient. The obtained results provide an insight into the thermodynamic effect on the cavitating flows.
{"title":"Computational Analyses of Cavitating Flows in Cryogenic Liquid Hydrogen","authors":"Sun Tiezhi, Wei Ying-jie, Wang Cong","doi":"10.11916/J.ISSN.1005-9113.2016.05.001","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.05.001","url":null,"abstract":"The objective of this study is to analyze the fundamental characteristics and the thermodynamic effects of cavitating flows in liquid hydrogen. For this purpose, numerical simulation of cavitating flows are conducted over a three dimensional hydrofoil in liquid hydrogen. Firstly, the efficiency of this computational methodology is validated through comparing the simulation results with the experimental measurements of pressure and temperature. Secondly, after analysing the cavitating flows in liquid hydrogen and water, the characteristics under cryogenic conditions are highlighted. The results show that the thermodynamic effects play a significant role in the cavity structure and the mass transfer, the dimensionless mass transfer rate of liquid hydrogen is much larger, and the peak value is about ninety times as high as water at room temperature. Furthermore, a parametric study of cavitating flows on hydrofoil is conducted by considering different cavitation number and dimensionless thermodynamic coefficient. The obtained results provide an insight into the thermodynamic effect on the cavitating flows.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83432862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on the screw theory and the driven-chain principle, a methodology of structural synthesis for fully-decoupled two-translational (2T) and two-rotational (2R) parallel mechanism is proposed by analyzing the characteristics of the input-output relations for fully-decoupled parallel mechanisms. Firstly, according to the desired kinematic characteristics of fully-decoupled parallel mechanisms, a method is proposed by virtue of screw theory to synthesize the desired forms for both the direct and the inverse Jacobian matrices. Secondly, according to the feature of the direct and the inverse Jacobian matrices, the effective screws, the actuated screws and the mobile un-actuated screws of each leg are established based on the reciprocal screw theory and all possible topology structures fulfilling the requirements are obtained. Finally, the desired fully-decoupled parallel mechanisms can be synthesized by using the structural synthesis rule and structural synthesis of fully-decoupled 2T2R parallel mechanisms can be obtained exploiting the abovementioned methodology. In particular, the direct Jacobian matrix of each synthesized fully-decoupled 2T2R parallel mechanism is a non-zero diagonal matrix throughout the entire workspace. Motors are mounted on each leg and each one of them actuates one degree-of-freedom (DoF) of the fully-decoupled parallel mechanism through a one-to-one velocity relation.
{"title":"Type Synthesis of fully-Decoupled 2T2R Parallel Mechanisms Based on Driven-Chain Principle","authors":"Yi, Cao, Hai, Chen, Youlei, Qin, Shuyi, Ge, Hui, Zhou","doi":"10.11916/j.issn.1005-9113.2016.05.007","DOIUrl":"https://doi.org/10.11916/j.issn.1005-9113.2016.05.007","url":null,"abstract":"Based on the screw theory and the driven-chain principle, a methodology of structural synthesis for fully-decoupled two-translational (2T) and two-rotational (2R) parallel mechanism is proposed by analyzing the characteristics of the input-output relations for fully-decoupled parallel mechanisms. Firstly, according to the desired kinematic characteristics of fully-decoupled parallel mechanisms, a method is proposed by virtue of screw theory to synthesize the desired forms for both the direct and the inverse Jacobian matrices. Secondly, according to the feature of the direct and the inverse Jacobian matrices, the effective screws, the actuated screws and the mobile un-actuated screws of each leg are established based on the reciprocal screw theory and all possible topology structures fulfilling the requirements are obtained. Finally, the desired fully-decoupled parallel mechanisms can be synthesized by using the structural synthesis rule and structural synthesis of fully-decoupled 2T2R parallel mechanisms can be obtained exploiting the abovementioned methodology. In particular, the direct Jacobian matrix of each synthesized fully-decoupled 2T2R parallel mechanism is a non-zero diagonal matrix throughout the entire workspace. Motors are mounted on each leg and each one of them actuates one degree-of-freedom (DoF) of the fully-decoupled parallel mechanism through a one-to-one velocity relation.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66564828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.11916/J.ISSN.1005-9113.2016.05.009
Huandi Huang, Jie Ding, Liu Xianshu, Guojun Xie, Dihui Song
Due to its persistence and bio-toxicity, benzothiazole (BTH) cannot be biodegraded efficiently. Recent work has shown that removal rates of biorefractory organics can be enhanced by the addition of co-substrates. In this work, ethanol, acetate, propionate and butyrate were added as co-substrates in order to promote the degradation of BTH in microbial electrolysis cell (MEC). By probing the changes in degradation rates of BTH in the presence of different co-substrates, it was observed that all the four co-substrates can enhance the BTH degradation in MEC, both the efficiency (E) and the rate (R). It was also found that acetate is more effective than others, which made the degradation efficiency of BTH up to 90% with acetate-C at 350 mg/L (measuring by the carbon content of co-substrate, the same below), within 6 h and the degradation rate of BTH arrived 0.001 2/(mg·h). The microbacteria in MEC have also been influenced by different co-substrates. This metabolism of the co-substrates enables the microbacteria on anode to generate ATP and thus grow to ensure the microbacteria activity. Therefore, this work showed that the addition of co-substrates such as acetate can be a novel and efficient approach for improving the elimination of BTH from wastewaters by MEC system.
{"title":"Effect of Co-substrate on Degradation of Benzothiazole in MEC","authors":"Huandi Huang, Jie Ding, Liu Xianshu, Guojun Xie, Dihui Song","doi":"10.11916/J.ISSN.1005-9113.2016.05.009","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.05.009","url":null,"abstract":"Due to its persistence and bio-toxicity, benzothiazole (BTH) cannot be biodegraded efficiently. Recent work has shown that removal rates of biorefractory organics can be enhanced by the addition of co-substrates. In this work, ethanol, acetate, propionate and butyrate were added as co-substrates in order to promote the degradation of BTH in microbial electrolysis cell (MEC). By probing the changes in degradation rates of BTH in the presence of different co-substrates, it was observed that all the four co-substrates can enhance the BTH degradation in MEC, both the efficiency (E) and the rate (R). It was also found that acetate is more effective than others, which made the degradation efficiency of BTH up to 90% with acetate-C at 350 mg/L (measuring by the carbon content of co-substrate, the same below), within 6 h and the degradation rate of BTH arrived 0.001 2/(mg·h). The microbacteria in MEC have also been influenced by different co-substrates. This metabolism of the co-substrates enables the microbacteria on anode to generate ATP and thus grow to ensure the microbacteria activity. Therefore, this work showed that the addition of co-substrates such as acetate can be a novel and efficient approach for improving the elimination of BTH from wastewaters by MEC system.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66564394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-25DOI: 10.11916/J.ISSN.1005-9113.2016.03.010
Sheng Chuan, Zhang Yongshun, Lu Wenlong
The study of phased array radar （ P A R ） pulse amplitude sequence characteristics is the key tounderstand the radar5 s working state and its beam 5 s scanning manner. According to the principle of antennapattern formation and the searching and tracking modes of beams, this paper analyzes the characteristics anddifferences of pulse amplitude sequence when the radar beams work in searching and tracking modesrespectively. Then an optimal sorting model of pulse amplitude sequence is established based on least-squaresand curve-fitting methods. This method is helpful for acquiring the current working state of the radar andrecognizing its instantaneous beam pointing by sorting the pulse amplitude sequence without the necessity toestimate the antenna pattern.
{"title":"An Optimal Sorting of Pulse Amplitude Sequence Based on the Phased Array Radar Beam Tasks","authors":"Sheng Chuan, Zhang Yongshun, Lu Wenlong","doi":"10.11916/J.ISSN.1005-9113.2016.03.010","DOIUrl":"https://doi.org/10.11916/J.ISSN.1005-9113.2016.03.010","url":null,"abstract":"The study of phased array radar （ P A R ） pulse amplitude sequence characteristics is the key tounderstand the radar5 s working state and its beam 5 s scanning manner. According to the principle of antennapattern formation and the searching and tracking modes of beams, this paper analyzes the characteristics anddifferences of pulse amplitude sequence when the radar beams work in searching and tracking modesrespectively. Then an optimal sorting model of pulse amplitude sequence is established based on least-squaresand curve-fitting methods. This method is helpful for acquiring the current working state of the radar andrecognizing its instantaneous beam pointing by sorting the pulse amplitude sequence without the necessity toestimate the antenna pattern.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66564764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-06-25DOI: 10.11916/j.issn.1005-911
Zhou Yang, Wu Dewei, Liu Weilong, Du Jia
To simulate the firing pattern of biological grid cells, this paper presents an improved computational model of grid cells based on column structure. In this model, the displacement along different directions is processed by modulus operation, and the obtained remainder is associated with firing rate of grid cell. Compared with the original model, the improved parts include that: the base of modulus operation is changed, and the firing rate in firing field is encoded by Gaussian-like function. Simulation validates that the firing pattern generated by the improved computational model is more consistent with biological characteristic than original model. Besides, the firing pattern is badly influenced by the cumulative positioning error, but the computational model can also generate the regularly hexagonal firing pattern when the real-time positioning results are modified.
{"title":"Improved Computational Model of Grid Cells Based on Column Structure","authors":"Zhou Yang, Wu Dewei, Liu Weilong, Du Jia","doi":"10.11916/j.issn.1005-911","DOIUrl":"https://doi.org/10.11916/j.issn.1005-911","url":null,"abstract":"To simulate the firing pattern of biological grid cells, this paper presents an improved computational model of grid cells based on column structure. In this model, the displacement along different directions is processed by modulus operation, and the obtained remainder is associated with firing rate of grid cell. Compared with the original model, the improved parts include that: the base of modulus operation is changed, and the firing rate in firing field is encoded by Gaussian-like function. Simulation validates that the firing pattern generated by the improved computational model is more consistent with biological characteristic than original model. Besides, the firing pattern is badly influenced by the cumulative positioning error, but the computational model can also generate the regularly hexagonal firing pattern when the real-time positioning results are modified.","PeriodicalId":39923,"journal":{"name":"Journal of Harbin Institute of Technology (New Series)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73376480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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