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Search Results: 1 - 10 of 28578 matches for " Jianlin SUN "
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Simulation of terrestrial carbon cycle balance model in Tibet

WANG Jianlin,HU Dan,SUN Zibao,

地理学报 , 2003,
Abstract: Based on climate material, the simplified terrestrial carbon cycle balance (TCCB) model was established, which is semi-mechanism and semi-statistics. Through TCCB model, our estimate indicates that the southeastern part of the Tibetan Plateau has much higher carbon content, and we have calculated the litter carbon pool, NPP, carbon fluxes and described their spatial characteristics in this region. Based on the TCCB model simulation, NPP in Tibet is 1.73×108 tC/a, soil organic input rate is 0.66×108 tC/a, litter mineralization rate is 1.07×108 tC/a, vegetation litterfall rate is 1.73×108 tC/a, the litter carbon pool is 7.26×108 tC, and soil decomposition rate is 309.54×108 tC/a. The carbon budget was also analyzed based on the estimates of carbon pool and fluxes. The spatial distributions of carbon pools and carbon fluxes in different compartments of terrestrial ecosystem were depicted with map respectively in Tibet. The distribution of NPP, vegetation litterfall rate, litter, litter mineralization rate, soil organic input rate and the soil decomposition rate were abstracted with temperature, precipitation, fractional vegetation and land feature.
Simulation of terrestrial carbon cycle balance model in Tibet
西藏高原地区陆地生态系统碳素循环平衡模拟

Wang Jianlin,Hu Dan,Sun Zibao,
WANG Jianlin
,HU Dan,SUN Zibao

地理学报(英文版) , 2003,
Abstract: Based on climate material, the simplified terrestrial carbon cycle balance (TCCB) model was established, which is semi-mechanism and semi-statistics. Through TCCB model, our estimate indicates that the southeastern part of the Tibetan Plateau has much higher carbon content, and we have calculated the litter carbon pool, NPP, carbon fluxes and described their spatial characteristics in this region. Based on the TCCB model simulation, NPP in Tibet is 1.73 X 108tC/a, soil organic input rate is 0.66 × 108 tC/a, litter mineralization rate is 1.07 × 108 tC/a, vegetation litterfall rate is 1.73 ×108tC/a, the litter carbon pool is 7.26 × 108 tC, and soil decomposition rate is 309.54 × 108 tC/a. The carbon budget was also analyzed based on the estimates of carbon pool and fluxes. The spatial distributions of carbon pools and carbon fluxes in different compartments of terrestrial ecosystem were depicted with map respectively in Tibet. The distribution of NPP, vegetation litterfall rate, litter, litter mineralization rate, soil organic input rate and the soil decomposition rate were abstracted with temperature, precipitation, fractional vegetation and land feature.
Semantic-based Concurrency Control for Advanced Database Systems
高级数据库系统中基于语义的并发控制

Sun Jianlin & He Zhijun,
孙建伶
,何志均

计算机科学 , 1994,
Abstract: This paper surveys the semantic-based concurrency control for advanced database systems. which aimed to eliminate the limitation of conventional concurrency control and to meet the requirements of advanced database applications. Covered in the paper are those approaches that using transaction semantic,that using abstract data type semantic,and that supporting for cooperation. The current situation and the future directions of the semantic-based concurrency control are also analysized.
DC Flashover Performance of Various Types of Ice-Covered Insulator Strings under Low Air Pressure
Jianlin Hu,Caixin Sun,Xingliang Jiang,Daibo Xiao,Zhijin Zhang,Lichun Shu
Energies , 2012, DOI: 10.3390/en5051554
Abstract: In this study, icing flashover performance tests of typical DC porcelain, glass, and composite insulators are systematically carried out in a multifunction artificial climate chamber. The DC icing flashover voltages of seven typical insulators under various conditions of icing thickness, pollution severity before icing, string length, and atmospheric pressure are obtained. The relationships between icing thickness, salt deposit density as well as atmospheric pressure and the 50% icing flashover voltage are analyzed, and the formulas are obtained by regression method. In addition, the DC icing flashover voltage correction method of typical porcelain, glass, and composite insulator in the coexisting condition of high altitude, contamination, and icing is proposed.
Model for Predicting DC Flashover Voltage of Pre-Contaminated and Ice-Covered Long Insulator Strings under Low Air Pressure
Jianlin Hu,Caixin Sun,Xingliang Jiang,Qing Yang,Zhijin Zhang,Lichun Shu
Energies , 2011, DOI: 10.3390/en4040628
Abstract: In the current study, a multi-arc predicting model for DC critical flashover voltage of iced and pre-contaminated long insulator strings under low atmospheric pressure is developed. The model is composed of a series of different polarity surface arcs, icicle-icicle air gap arcs, and residual layer resistance. The calculation method of the residual resistance of the ice layer under DC multi-arc condition is established. To validate the model, 7-unit and 15-unit insulator strings were tested in a multi-function artificial climate chamber under the coexistent conditions of low air pressure, pollution, and icing. The test results showed that the values calculated by the model satisfactorily agreed with those experimentally measured, with the errors within the range of 10%, validating the rationality of the model.
An S-Transform and Support Vector Machine (SVM)-Based Online Method for Diagnosing Broken Strands in Transmission?Lines
Xingliang Jiang,Yunfeng Xia,Jianlin Hu,Zhijin Zhang,Lichun Shu,Caxin Sun
Energies , 2011, DOI: 10.3390/en4091278
Abstract: During their long-term outdoor field service, overhead transmission lines will be exposed to strikes by lightning, corrosion by chemical contaminants, ice-shedding, wind vibration of conductors, line galloping, external destructive forces and so on, which will generally cause a series of latent faults such as aluminum strand fracture. This may lead to broken transmission lines which will have a very strong impact on the safe operation of power grids that if the latent faults cannot be recognized and fixed as soon as possible. The detection of broken strands in transmission lines using inspection robots equipped with suitable detectors is a method with good prospects. In this paper, a method for detecting broken strands in transmission lines using an eddy current transducer (ECT) carried by a robot is developed, and an approach for identifying broken strands in transmission lines based on an S-transform is proposed. The proposed approach utilizes the S-transform to extract the module and phase information at each frequency point from detection signals. Through module phase and comparison, the characteristic frequency points are ascertained, and the fault information of the detection signal is constructed. The degree of confidence of broken strand identification is defined by the Shannon fuzzy entropy (SFE-BSICD). The proposed approach combines module information while utilizing phase information, SFE-BSICD, and the energy, so the reliability is greatly improved. These characteristic qualities of broken strands in transmission lines are used as the input of a multi-classification SVM, allowing the number of broken strands to be determined. Through experimental field verification, it can be shown that the proposed approach displays high accuracy and the SFE-BSICD is defined reasonably.
The use of stable isotopes to partition evapotranspiration fluxes into evaporation and transpiration

Shichun Zhang,Xuefa Wen,Jianlin Wang,Guirui Yu,Xiaomin Sun,

生态学报 , 2010,
Abstract:
STUDY ON CRACK AND STRENGTH OF JOINT ROCK UNDER COMPRESSION-SHEAR STRESS
节理岩体压剪断裂及其强度研究

Li Jianlin,Sun Zhihong,
李建林
,孙志宏

岩石力学与工程学报 , 2000,
Abstract: 采用等效的原则确定裂纹前沿应力分布,通过岩石力学中广泛应用的Hock-Brown准则,建立了岩石压剪断裂等效判据,并首先将H-B准则中的参数m,n与断裂韧工KIC,KIC联系起来,该判据与试验值有较好的一致性,并由此估算了岩体的强度。
Investigation of the Microstructure of Rolled Semi-Solid Steel
Investigation of the Microstructure of Rolled Semi—Solid Steel

Renbo SONG,Yonglin KANG,Jianlin SUN,Xiongfei YANG,Aimin ZHAO,Weimin MAO,
RenboSONG
,YonglinKANG

材料科学技术学报 , 2002,
Abstract: In this paper, spring steel-60Si2Mn and stainless steel-1Cr18Ni9Ti were rolled one pass in the semi-solid state. The microstructural evolution during rolling of the steels with different solid fraction was investigated. The experimental results showed that the manner of liquid and solid phases flowing and deforming was different. During rolling, most of solid phases remained in the center of the rolled specimens, while liquid phase flowed to the edge, which resulted in the macrosegregation of liquid and solid phases. Only the amount of solid fraction reached a certain value, were the solid phases deformed and flattened.
Optimal Design of Mfl Sensor for Detecting Broken Steel Strands in Overhead Power Line
Xingliang Jiang;Yunfeng Xia;Jianlin Hu;Fanghui Yin;Caixin Sun;Ze Xiang
PIER , 2011, DOI: 10.2528/PIER11072711
Abstract: Aluminum conductor steel-reinforced (ACSR) cable is a specific type of stranded cable typically used for electrical power delivery. Steel strands in ACSR cable play a supportive role for overhead power line. Inspection timely is an important means to insure safety operation of power lines. As steel strands are wrapped in the center of ACSR cable, the common artificial inspection methods with optical instruments are limited to find inner flaws of power line. Recently, inspection of power line by robot with detectors is a method with good prospect. In this paper, the optimal design model of detector based on magnetic leakage flux (MLF) carried by robot for detecting broken steel strands in ACSR cables has been proposed. The optimal design model of MFL sensor is solved by niche genetic algorithm (NGA). Field experiment results show that the design method of the detector can be applied to different types of ACSR cables. The magnitude field induced by transmission current has nearly no influences on the detection of broken steel strands, and the developed detector carried by robot can identify broken steel strands with high reliability and sensitivity.
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