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Chen L.-J.,Fuzhou University | Dai Z.-H.,Fuzhou University | Liu Z.-W.,Fujian Electric Power Company
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

A series of stress path tests on typical soft soils (silt and organic silty clay) in the influence range of foundation pit in Fuzhou city were conducted by using triaxial apparatus with stress and strain control in order to research the stress-strain behaviours of unloading and loading caused by excavation and retaining structure of foundation pit. Compared with the results of triaxial tests between normal consolidation and K0 consolidation samples in the same confining pressure, it is indicated that there are large differences in deformation and strength. Based on the results of K0consolidated triaxial tests, Duncan-Chang parameters were figured out and the methods of certification of each parameter in the model were put forward. At the same time, comparison with model parameters obtained by normal consolidation samples showed that some parameters had significant difference; and they decided the difference of stress-strain relationship. Duncan-Chang model parameters were suggested to obtained through triaxial loading and unloading test by K0 consolidation samples for the sake of satisfying numerical simulation analysis of foundation pit engineering. Duncan-Chang parameters of typical soft soils offered by the tests can be referred to numerical simulation of foundation pit engineering in Fuzhou city or other similar strata sites. Source

Xu L.,Fujian Electric Power Company | Xu L.,Tsinghua University | Su J.,Tsinghua University
Energy Policy | Year: 2016

This paper proposes a new typology that classifies innovation policy instruments into two dimensions: government-selection versus market-selection, and producer-orientation versus consumer-orientation. Such a typology articulates the importance of consumer behavior in the policy design for a transition, and the relevance for the market to select target subjects of policy during the deployment stage of clean technology innovation. We apply this typology to policy instruments of China's new energy vehicle (NEV) industry between 1991 and 2015 in order to explain the industry's rapid growth. The focus of China's policy mix has transited from government-selection to market-selection, and from producer-orientation to consumer-orientation. Other than the new typology, this paper traces the entire history of policy transition within China's NEV industry, and finds the transition to be a result of policy learning, thus contributing to future empirical studies of this industry. © 2016 Elsevier Ltd. Source

Zeng H.,Fuzhou Extra High Voltage Power Transmission and Substation Bureau of Fujian Electrical Power Co. | Lin F.,Fujian Electric Power Company
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

A fault locating algorithm based on phase characteristics is proposed for the hybrid transmission line, which defines a new fault locating function. The phase of fault locating function changes abruptly at the fault point only once when the location of reference point changes from its left side to its right side, which can be used to quickly locate the fault point. Without identifying the faulty section, the hybrid transmission line is equalized a line with the same length for fault locating. The proposed fault locating algorithm has no dead zone and is nearly immune to transition resistance, fault type, sampling frequency, fault position and load current, which are verified by PSCAD simulation. Source

Mathanker S.K.,Fujian Electric Power Company | Hansen A.C.,University of Illinois at Urbana - Champaign
Applied Engineering in Agriculture | Year: 2014

Previous studies have shown that cutting speed and blade configurations play a critical role in crop harvesting. This study investigated the effect of cutting speed, blade oblique angle, and blade mounting in a field setting. To investigate their effect on Miscanthus harvesting power consumption, a hydraulically-driven single disk cutter head platform was developed. It has the provisions to adjust cutting parameters and was instrumented to measure the bending force on a push bar, torque, and cutting speed of the disk cutter. The cutting energy was determined at three oblique angles (0°, 30°, 40°), two blade mountings (fixed, flexible), and three hydraulic flow settings to drive the developed platform. Three hydraulic flow settings were used that resulted in average recorded cutting speeds of 31.5, 47.3, and 63.0 m s-1. The differences between the blade mountings were found to be negligible. A 40° oblique angle operating at 31.5 m s-1 had the lowest energy consumption, averaging 9.1 MJ ha-1. Similarly, a 30° oblique angle consumed 16.9 MJ ha-1 and a straight blade consumed 23.1 MJ ha-1. The results indicate that the cutting speed and blade oblique angle are directly related to the power requirements and efficiency of Miscanthus harvesting machinery. Information about the bending force of the Miscanthus was also collected and compared to the energy consumption of the machine. The data show that the energy consumption was correlated to the bending force. It is expected that the results of this study would help in modifying existing Miscanthus harvesters. © 2014 American Society of Agricultural and Biological Engineers. Source

Liu S.,Fujian Electric Power Company | Narentuya,China University of Geosciences | Xia B.,Beijing University of Technology | Chu G.,CAS Institute of Geology and Geophysics | Tian M.,China University of Geosciences
Quaternary Geochronology | Year: 2012

Dating the desert lake sediments using 210Pb uns and 137Cs methods is challenging because of the low atmospheric fluxes and the unexpected irregular variations in the specific activity profiles. Due to the large numbers of permanent lakes in the Badain Jaran Desert, they provide abundant sites for investigating the desert 210Pb uns and 137Cs geochronology. Research was performed to determine the reliable ages using this methodology and obtain a better understanding of the principal factors that affect the dating results. The top 20-30 cm of core SH-1 from Lake Shuanghaizi and of core YD-1 from Lake Yindeertu in Badain Jaran Desert were dated. The results support multiple conclusions. (1) Both cores have low surficial 210Pb uns activities (SH-1, 24.5 Bq kg -1; YD-1, 59.7 Bq kg -1) compared with those of the cores from arid Northwest China, such as Lake Bosten (350 Bq kg -1) and Lake Wulungu (523.37 Bq kg -1) from Xinjiang. Although the 210Pb record in SH-1 has multiple irregular variations with depth, the exponential decrease in the YD-1 activity profiles appears fairly regular. (2) The 210Pb uns activities are highly correlated with the sample salt concentration (SSC). (3) Sediment dates for core SH-1 derived from the constant rate of 210Pb supply (CRS) model indicate that it spans a period of 65 years (1942 AD-2007 AD) with an average sedimentation rate of 0.21 cm a -1 (0.16 g cm -2 a -1). Sediment dates for core YD-1 derived from the corrected CRS model indicate that it spans a period of 121 years old (1889 AD-2010 AD) with an average sedimentation rate of 0.16 cm a -1 (0.12 g cm -2 a -1). In both cores, the 137Cs time markers of 1963 appeared at different depths, which may result from the differing sedimentation rates at the sites of the cores. The sedimentation rates calculated from the CRS-determined age differences between the SH-1 and YD-1 cores appear to have resulted from the topographies containing various mega-dunes and regional aeolian activity patterns. We believe that the low 210Pb flux and the unexpected fluctuations in the 210Pb profiles are the principal factors affecting our dating results. The low 210Pb uns activities were caused by infrequent rainfall and mega-dune barriers. The unexpected fluctuations in the 210Pb uns profiles resulted from the salt crystallisation that occurred via deposition or post-sedimentation. The salt crystallisation has been closely associated with abrupt regional climate changes, including rainfall, temperature and serious drought events during the 1950s-1970s. © 2012 Elsevier B.V. Source

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