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Journal of Drainage and Irrigation Machinery Engin
 
2024 Vol.42 Issue.1
Published 2024-01-25
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2024 Vol. 42 (1): 0- [Abstract] ( 3 ) [HTML 1KB] [ PDF 28936KB] ( 79 )
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2024 Vol. 42 (1): 0- [Abstract] ( 4 ) [HTML 1KB] [ PDF 1143KB] ( 87 )
1 Influence of guide vane airfoil profiles on pump-turbine“S”characteristics
LI Qifei,*,XIE Gengda,HAN Tianding,LI Zhenggui
Aiming at the instability problem in the ″S″ characteristic region of the pump-turbine, a modified movable guide vane airfoil was proposed to improve the performance. Taking a pump-turbine model machine as the research object, the SST k-ω turbulence model was used to carry out three-dimensional numerical calculations on the whole flow channel of the pump-turbine. By modifying the design of the movable guide vane airfoil, a Q-n curve was obtained, and the improvement of the ″S″ characteristics of the unit was analyzed. The calculation results were compared with the test results, and the pressure pulsation analysis was carried out in the bladeless area of the unit before and after the modification of the movable guide vane airfoil. The results show that under the premise of ensuring that the overall efficiency is still maintained near 92%, the new movable guide vane airfoil still has an improved effect on the ″S″ characteristics of the unit. The pressure pulsation in the bladeless zone is mainly caused by the aggregation of the flow in the active guide vane area and the disturbance of the rotator and stator interaction with the runner blades. The modified movable guide vanes reduce the amplitude pf pressure pulsation in bladeless zone and improve the grid connection stability of the pump-turbine during operation.

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2024 Vol. 42 (1): 1-7 [Abstract] ( 6 ) [HTML 1KB] [ PDF 3369KB] ( 65 )
8 Simulation of hydraulic turbine regulation system based on improved gravitational search algorithm
PAN Hong,HANG Chenyang*,ZHENG Yuan
In response to the current challenges faced by hydropower units, such as multiple complex operating conditions and limitations in engineering calculations due to algorithm complexity, an improved gravitational search algorithm(improved PSOGSA)was proposed to enhance the optimization performance of hydraulic turbine control parameters and address the shortcomings of traditional control strategies in meeting dynamic demands. Firstly, combined with the PSO algorithm, a learning factor was introduced into the velocity update formula of GSA for improvement. Secondly, a weighting coefficient was applied to optimize the position update formula to enhance the algorithm′s adaptability. Finally, combined with relevant simulation modeling experiments, the proposed improved PSOGSA was utilized to optimize the PID parameters of the hydraulic turbine regulation system. The simulation results demonstrate that, when subjected to a 5% no-load frequency disturbance, the improved PSOGSA PID controller is significantly superior to the conventional algorithm mentioned above. The regulated model system achieves stability within a shorter time period, and its overshoot at this time is much lower than that of conventional algorithms. These findings indicate that the improved PSOGSA exhibits higher ite-ration efficiency in subsequent iterations, and improves the problem of easily converging to local optima in conventional algorithms. Thus, the reasonable and effectiveness of the improved PSOGSA are validated, and control effect of the hydraulic turbine regulating system is optimized to a certain extent.

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2024 Vol. 42 (1): 8-13 [Abstract] ( 6 ) [HTML 1KB] [ PDF 1764KB] ( 76 )
14 Effect of diffuser blade number on transient characteristics of water-jet pump
LI Minghui,LIU Houlin*,TAN Minggao,WU Xianfang,MA Haochen
In order to reveal the transient characteristics of water-jet pump with different diffuser numbers, the flow field and sound field of water-jet pump were carried out based on DES hybrid simulation and FEM acoustic finite element method. The accuracy of numerical computation method on transient characteristics was verified by the experimental results. The influence of different diffuser blade numbers(Z=5, 6,7)on the thrust, pressure pulsation and flow-induced noise of water-jet pump were studied. The results show that with the increase of diffuser blade number, the thrust first decreases and then increases, but the flow rate gradually decreases, and the torque gradually increases. The diffuser blade number has a relatively small influence on the distribution pattern of pressure pulsation at the impeller outlet, but has a significant influence on the pressure pulsation amplitude at the main frequency. The pressure pulsation amplitude at the hub decreases first and then increases with the increase of diffuser blade numbers, while the amplitude at the rim and flow passage center gradually decreases with the number of diffuser blade increasing. The diffuser blade number affects the main frequency distribution of the flow-induced noise, and the increase of the diffuser blade number is beneficial for reducing the amplitude and total sound pressure level at the main frequency of the flow-induced noise in the water-jet pumps.

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2024 Vol. 42 (1): 14-20 [Abstract] ( 6 ) [HTML 1KB] [ PDF 8763KB] ( 86 )
21 Stability of water-lubricated bearing rotor system of seawater desalination high-pressure pump and energy recovery integrated machine
PAN Wenyi,LI Yan,ZHANG Desheng*,JING Rui,HU Jingning,YE Xiaoyan
In order to ensure the safe and operational stability of seawater desalination high-pressure pump and energy recovery integrated machine, the stability of water-lubricated rotor system with inclined journal was studied. Based on hydrodynamic lubrication theory, a 32 dynamic coefficient model considering four degrees of freedom by using difference method and perturbation method was established. At the same time, the rotor dynamic equation was solved, and the effects of the dynamic and static characteristics of the bearing under different eccentricity, inclination angle and load were analyzed. The hydrodynamic lubrication effect caused by the water film in the ring gap on the stability of the rotor was also studied. The characteristic equation was solved, and the stability of the rotor was analyzed by the real part of the eigenvalue. The results show that the tilt motion has a significant impact on the stability of the rotor. The increase of eccentricity and tilt angle under four degrees of freedom increases 32 dynamic characteristic coefficients to varying degrees, which reduces the displacement caused by rotor whirl during operation and increases bearing capacity. In addition, the hydrodynamic lubrication effect of the water film in the gap between the mouth ring has a non-negligible impact on the stability of the rotor, which can reduce the displacement response of the rotor to 1/3 of the original and the time to achieve stable operation to 1/3 of the original. The study finds that the limit speed of the integrated machine rotor is between 40 000-45 000 r/min. If the speed exceeds this limit, the characte-ristic value of the positive real part appears in the system, which can lead to instability. The limit speed of the rotor can be increased by increasing the width of the mouth ring and reducing the thickness of the water film gap of the mouth ring and intermembrane space gap.

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2024 Vol. 42 (1): 21-29 [Abstract] ( 5 ) [HTML 1KB] [ PDF 4369KB] ( 98 )
30 Performance analysis of industrial by-product modified calcium Sulphoaluminate cement based on RSM
XUE Jianfei,LIANG Bing,HE Xingxing,TIAN Duowen,FENG Dianzhi,SHU Libing,WAN Yong,*
To investigate the pattern of influence of industrial by-products such as flue gas desulfurization gypsum(FGDG), fly ash(FA), and limestone(LS)on the strength and pH of calcium sulphoaluminate cement(SAC), FGDG, FA, and LS were used as solid waste admixture to modify SAC clinker and the modified SAC cured for 7 d and 28 d was tested for unconfined compressive strength(UCS)and pH. Response surface methods(RSM)were also used to develop regression models for the UCS and pH of the modified SAC. The effect patterns of each factor on UCS and pH were analyzed. The results of the study showed that both the UCS and pH of the modified SAC are influenced by the single and multifactorial effects of FGDG, FA, and LS. The interaction between FGDG and LS, LS and FA has a significant effects on UCS7 d and UCS28 d. The interaction between LS and FA, FGDG and FA has a significant effects on pH7 d, but not on pH28 d. The RSM-BBD multi-objective optimization method were used to optimize industrial by-products, the established regression model has high reliability and accuracy, and the optimal addition ratio meeting the requirements of high strength and low alkalinity is obtained, and the error of the test and the predicted values was small under this ratio.

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2024 Vol. 42 (1): 30-36 [Abstract] ( 3 ) [HTML 1KB] [ PDF 3504KB] ( 73 )
37 Experimental study on direct water hammer pressure characteristics in PMMA pipelines
ZHANG Xiaoying*,BIAN Shaokang,FENG Mengxue,LU Wei,ZHANG Jian
To understand the water hammer pressure characteristics of viscoelastic pipelines, a series of shut-off valve water hammer tests were conducted by construction of a reservoir-pipeline-valve system model. The direct water hammer pressure change law generated by the shut-off valve for the PMMA pipeline at the initial opening were 30%, 100% of the end valves were studied. From the perspective of the constitutive relationship of viscoelastic materials, the influence mechanism of valve closing time on the direct water hammer of viscoelastic materials was analyzed The 3D numerical simulations were conducted on the flow field at two different initial openings near the valve. The results show that the variation of direct water hammer pressure in viscoelastic pipelines is inconsistent with traditional water hammer theory. Direct water hammer pressure is not only related to the valve closing time but also to the valve initial opening time. The laws of ″The faster the valve closes, the greater the direct water hammer pressure″ and ″The smaller the initial opening of the valve, the greater the direct water hammer pressure″ are met.

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2024 Vol. 42 (1): 37-42 [Abstract] ( 6 ) [HTML 1KB] [ PDF 3766KB] ( 122 )
43 Analysis of water hammer characteristics of liquid fuel transmission pipeline under complex working conditions with multiple valves
LIU Jianying,CHEN Huilong*
The multi-valve liquid fuel delivery pipeline system is a relatively complex branched pipeline network, working with a large number of end valves in different combinations. The working conditions are relatively complex, and water hammer and its mutual influence problems often occur in the pipeline network, which seriously affects the working performance and reliability of the pipeline system. In response to the problem of excessive mutual influence of water hammer pressures in different valve branches during the operation of a multi-valve fuel delivery pipeline system, taking into account the constraints of fast response requirements, lightweight, and compact structure of the system, the water hammer characteristics of the pipeline under complex working conditions of multiple valves were studied through experiments. The relationship between the changes in water hammer pressure in the pipeline and the pulse working mode of the valve, as well as the combination of valves working simultaneously, were researched. The relationship between water hammer pressure and the time interval between valve opening and closing, as well as the relationship between valve control cycle and the number of valves working simultaneously had also been deeply studied. Based on this, a water hammer suppression measure based on multi-valve working mode adjustment was proposed. The research results indicate that it is feasible to reduce water hammer pressure in the fuel delivery pipeline without increasing system complexity and weight.

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2024 Vol. 42 (1): 43-48 [Abstract] ( 5 ) [HTML 1KB] [ PDF 2036KB] ( 78 )
49 Analysis of cavitation phenomenon and cavitation erosion mechanism of cylinder liner of diesel engine
HAN Feng,LIU Quan,*,LI Yuhan,LI Chenyang,LIN Jiewei
Aiming at the cavitation phenomenon that occurs during the working process of diesel engine cylinder liners due to coolant cavitation, based on the numerical simulation of cavitation flow of a single cylinder cooling water jacket during the working process of diesel engine cylinder liners, combined with the simulation of near-wall multi-bubble collapse process, the cavitation phenomenon and cavitation erosion mechanism of diesel engine cylinder liners were studied from macro and meso perspectives. Firstly, based on the simulation of single cylinder cooling water jacket, it was found that the vibration of cylinder liner wall leads to cavitation of coolant and a large number of cavitation bubbles are generated. Then, the collapse process of near-wall bubbles was simulated, and the effects of the spacing and number of bubbles on the collapse of multi-bubbles were analyzed. The results show that the smaller the bubble spacing is, the longer the collapse time is. When the center spacing of bubbles decreases from 0.050 mm to 0.025 mm, the collapse pressure of near-wall bubbles increases by 49.82%, and the microjet velocity increases by 10.56%. When the number of bubbles is increased, the collapse pressure shows a trend of first increasing and then decreasing. When the number of bubbles increases from two to ten, the velocity of microjet increases by 44.93%. Research has shown that the micro jet produced by cavitation bubbles collapse has a high water hammer pressure, which acts on the cylinder liner wall and causes corrosion damage, and is the fundamental cause of cavitation erosion of the cylinder liner.

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2024 Vol. 42 (1): 49-56 [Abstract] ( 5 ) [HTML 1KB] [ PDF 4131KB] ( 120 )
57 Current deficiencies and needed enhancements on greenhouse crop evapotranspiration models
LI Mi,YAN Haofang,*,ZHANG Chuan,ZHANG Jianyun,WANG Guoqing,ACQUAH S J
Determination of greenhouse evapotranspiration(ETc)is important in making the accurate irrigation schedule and improving the agricultural water using efficiency, and in increasing the yield and quality of the greenhouse vegetables. The advantage disadvantages and applicability of the direct and indirect ETc models, different reference evapotranspiration(ET0)models for greenhouse crops were analyzed, and the accuracy of the direct mechanism ETc models was compared, the models for determination the key parameters(canopy resistance parameters)and its influence factors were summarized and analyzed. The previous studies have mainly corrected the canopy resistance parameters and verified the accuracy of the model for specific climatic regions, greenhouse ventilation types, crop types and planting seasons. The universality of the greenhouse crop ETc model is not sufficient, and the determined model parameters are often not applicable to other types of greenhouse or crop planting seasons. However, the applicability of these ETc models and parameters in different type of ventilated greenhouses and crop needs to be validated. Hence, it is recommended to focus on the following research on the response characteristics of the greenhouse ETc to the climatic variations, the comprehensive analysis of the applicability of the different mechanism ETc models to the climatic and crop types, and the construction of the much applicability and high accuracy ETc models.

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2024 Vol. 42 (1): 57-63 [Abstract] ( 3 ) [HTML 1KB] [ PDF 1445KB] ( 80 )
64 Effects of aeration on photosynthesis and water use efficiency of cotton under mulched drip irrigation in arid area of Northweste China
HAN Meiqi,WANG Zhenhua,*,ZHU Yan,WEN Yue,
In order to find out the suitable aerated irrigation mode for drip irrigation cotton in arid area of Northwest China, five aerated irrigation treatments were set up with non-aerated irrigation as control(CK): aerated irrigation at seedling stage(AS), aerated irrigation at budding stage(AB), aerated irrigation at flowering and boll stage(AF), aerated irrigation at budding stage + aerated irrigation at flowering and boll stage(ABF), aerated irrigation at seedling stage + aerated irrigation at budding stage + aerated irrigation at flowering and boll stage(AW). The effect of aerated irrigation at different growth stages on the photosynthesis and water use efficiency of cotton in arid areas of Northwest China was studied. The results show that compared with CK, the photosynthetic characteristics and aboveground biomass of all aerated treatments are significantly increased. Among them, the net photosynthetic rate of aerated treatment is significantly increased by 22.68%, the transpiration rate is significantly increased by 41.19%, the stomatal conductance is significantly increased by 33.42%, and the intercellular CO2 concentration is significantly decreased by 16.22%, respectively. Aerated irrigation at the flowering and boll stage significantly increases the dry matter accumulation of stems, leaves and buds / bolls by 29.26%, 11.15% and 33.41%, respectively. Under aerated irrigation at different growth stages, the optimal treatments for cotton photosynthetic characteristics, aboveground biomass and yield are AW and AF, and there is no significant difference. However, the water use efficiency of AF treatment is the highest, which is 1.51 kg/m3, significantly higher than that of AW treatment. Therefore, from the perspective of efficient water-saving and yield-increasing, aerated irrigation at the flowering and boll stage(AF)of cotton can be used as the best aeration irrigation mode for cotton under mulched drip irrigation in arid areas of Northwest China.
2024 Vol. 42 (1): 64-70 [Abstract] ( 7 ) [HTML 1KB] [ PDF 0KB] ( 26 )
71 Effects of deficit irrigation on soil microbial community structure diversity of sunflower in Hetao Irrigation District
ZHAO Sha,LI Weiping*,FENG Liang,CHI Zhaonan,ZHANG Jiapeng,WU Yixuan,WANG Jiashuang
In order to clarify the effect of deficit irrigation on soil microbial communities during the growth period of sunflowers, field experiments were carried out in Hetao Irrigation District. The local irrigation level was taken as the control(330 mm, CK), set mild water deficit(210 mm, W1)and severe water deficit(120 mm, W2). The effects of deficit irrigation on soil microbial community and physicochemical properties in the surface layer(0-20 cm)of sunflower at different growth stages of sunflower were analyzed, and the internal relationship between soil microbe and physicochemical pro-perties was revealed. The results showed that the treatment of W1 increased soil microbial diversity and the relative abundance of dominant phyla, such as Proteobacteria, Chloroflexi and Acidobacteria in bacteria, and Mortierellomycota in fungi. Compared with CK, the soil pH value decreased by an average of 0.13 units, temperature and nitrate nitrogen content increased by an average of 1.44 ℃ and 14.2%, respectively. Pearson correlation analysis showed that soil water content, temperature, pH, EC and nitrate nitrogen were the key factors affecting bacterial diversity. The temperature, ammonium nitrogen and nitrate nitrogen were the key factors affecting fungal diversity. Redundancy analysis showed that soil water content, EC and temperature were the main important factors affecting bacterial community structure. The soil water content, EC and ammonium nitrogen were the main important factors affecting fungal community structure. In summary, mild water deficit(W1)was the suitable water condition for microbial growth.

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2024 Vol. 42 (1): 71-78 [Abstract] ( 6 ) [HTML 1KB] [ PDF 3525KB] ( 119 )
79 Experimental study on water droplets characteristics of water-dispersing nozzle
ZHU Xingye,QIAN Zhao*,LIU Junping,ZHANG Aiying,WEI Qiao
In order to understand the hydraulic performance of a sprinkler nozzle, the laws of governing water droplet diameter, velocity and kinetic energy ware explored. A 2DVD video disdro-meter was used to conduct hydraulic performance experiments with sprinkler nozzles of 2 equivalent diameters De under 5 working pressures. The results show that the average water droplet dia-meter of the nozzles with equivalent diameters of 4.88 mm and 5.98 mm are mainly distributed within the ranges of 0.73-1.38 mm and 0.85-1.53 mm, respectively. This indicates that the smaller the equivalent diameter of the nozzle, the more concentrated the droplet distribution of water droplets may be. Furthermore, the average water droplet diameter increases exponentially with increasing the distance from the nozzle, showing an exponential distribution. Water droplet velocity also increases with increasing pressure and distance from the nozzle, and the average velocity of the nozzles with an equivalent diameter of 4.88 mm is greater than that of nozzles with an equivalent diameter of 5.98 mm. Under the same working pressure, the single droplet kinetic energy, unit volume energy and kinetic energy intensity of a nozzle with an equivalent diameter of 5.98 mm are all greater than those of the nozzles with an equivalent diameter of 4.88 mm. The single droplet kinetic energy is found to be related to the water droplet diameter exponentially, while the kinetic energy per unit volume is related to the distance from the nozzle exponentially. The kinetic energy intensity fluctuates within the range of 0.1-0.6 m from the nozzle with small amplitudes.

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2024 Vol. 42 (1): 79-85 [Abstract] ( 2 ) [HTML 1KB] [ PDF 4059KB] ( 65 )
86 Effect of micro-nano aeration on clogging of emitters in reclaimed water drip irrigation
DONG Conghui,LI Hao,LI Rui,SUN Hao,HAN Qibiao*,LI Hui
To study the effect of micro-nano bubbles to aeration in water on the clogging of emitters during drip irrigation with reclaimed water, four different types of irrigators were selected. Two treatment methods of reclaimed water with non-aeration and reclaimed water with aeration were set in expe-riment. The average flow rate discharge ratio variation(Dra)was used to express the development degree of emitter clogging, the Christensen uniformity coefficient(Cu)and statistical uniformity coefficient(Us)were used to evaluate the uniformity of drip irrigation system. The results show that micro-nano aeration has a very significant impact on the clogging of emitters in the reclaimed water drip irrigation system. Compared with the non-aeration treatment, the Dra values of the four emitters(E1, E2, E3, E4)are increased by 16.2%, 24.4%, 18.2% and 22.1%, respectively. The Cu and Us values of all emitters after aeration treatment are also much larger than those of emitters without aeration treatment. There are also certain differences in the control effect of aeration on the clogging of different emitters. Therefore, micro-nano aeration can reduce the risk of clogging emitters, delay the clogging degree, extend the service life of emitters and have a positive impact on the uniformity of the whole drip irrigation system. The experiment results can provide some technical support for the promotion and application of reclaimed water drip irrigation and aerated drip irrigation technology.

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2024 Vol. 42 (1): 86-94 [Abstract] ( 2 ) [HTML 1KB] [ PDF 2390KB] ( 89 )
95 Process parameters for rapid start-up of A/MBBR at low temperature
DONG Jinbo,WANG Fan,A Qiong*,XIE Qingjie,HAN Song
In order to explore the factors affecting the process start-up of anaerobic moving bed biofilm reactor at low temperature and obtain the optimal start-up process parameters, an experimental platform was established on the basis of selecting K3 filler packing as the reactor filler with natural inoculation process. Under different levels of filling rate, reflux ratio and hydraulic retention time at the water temperature of 8-12 ℃, and different operating conditions the operating effects of the reactor were obtained by studying on the treatment effect of the reactor during film hanging start-up on chemical oxygen demand, NH3-H and total phosphorus in sewage. The growth rate of biofilm under different operating conditions was obtained by studying on the mass changes of biofilm on the filler in the reactor. By studying the gas production rates of the biofilm, the total specific respiratory rates and endogenous sources specific respiratory rates of the biofilm in the reactor under different ope-rating conditions were obtained. By comparing the operating efficiency, the activity and respiratory rates of the biofilm, the optimal process parameters for the start-up of the A/MBBR with natural inoculation process at 8-12 ℃ were obtained: the filling rate was 40%, the reflux ratio was 20%, and the hydraulic retention time was 8 h. Under this operating condition, it can take into account the removal rate of pollutants, biofilm growth rate, and biofilm activity. It is the best starting condition and is expected to shorten the starting time by 23%.

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2024 Vol. 42 (1): 95-101 [Abstract] ( 5 ) [HTML 1KB] [ PDF 2839KB] ( 84 )
102 Study on cleaning effect and damage of jet cleaning on filter screen of micro-irrigation filter
LI Shiying,YE Hanchun,*,WANG Zhenhua,LIU Ningning,ZHANG Jinzhu,LI Miao,
To investigate the application of jet cleaning technology in the cleaning process of agricultu-ral micro-irrigation filters, the experimental study on jet cleaning was carried out. The influence of 3 parameters, including incident pressure, nozzle diameter, and nozzle diffusion angle, on the cleaning effect of micro-irrigation filter screen and the degree of surface damage. Test results show that the cleaning effect increases with increasing the incidence pressure, nozzle diameter, and nozzle diffusion angle, but the improvement magnitude continuously decreases. The filter surface′s damage degree increases with increasing the incident pressure and nozzle diameter, and decreases with the nozzle diffusion angle′s increase. Variance analysis shows that the order of the impact of the jet parameters on the cleaning effect from the largest to the smallest is nozzle diameter, incidence pressure, and nozzle diffusion angle. The degree of influence on the surface damage of the filter screen from the largest to the smallest is nozzle diameter, nozzle diffusion angle, and incidence pressure. Through TOPSIS comprehensive evaluation, the optimal combination of jet parameters is the incident pressure of 0.3 MPa, nozzle diameter of 3 mm, and nozzle diffusion angle of 80°.

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2024 Vol. 42 (1): 102-108 [Abstract] ( 3 ) [HTML 1KB] [ PDF 2932KB] ( 98 )
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