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Search Results: 1 - 10 of 3428 matches for " Liwei Shang "
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Design and Analysis of a Novel Surface Acoustic Wave Micro Position Sensor  [PDF]
Kai Yang, Zhigang Li, Liwei Shang, Weidong Yi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.311069
Abstract: In order to realize the micromation of position sensors, and extend the application area into micro scale, this paper designs a novel micro position sensor, Mace SAW (Surface Acoustic Wave) position sensor, which can be fabricated with MEMS technology. Its key components are IDTs (Interdigital Transducers) and reflective grooves. The structure and working principles of the sensor are introduced theoretically, and the manufacture process is then put forward.
The Transformer Equipment Selection’s Update Decision Technical and Economic Analysis Model  [PDF]
Jincheng Shang, Zhongfu Tan, Chen Zhang, Liwei Ju
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B027
Abstract: Based on the current situation of the domestic transformer equipment selection, the paper analyses the SH15, S11 and S9 transformer from the angles of annual running power consumption, payback period, energy efficiency of the transformer, furthermore, determine the best optimal capacity, load factor and update Year of the SH15-type transformers. Example analysis results show that, from the point of view of the technical and economic the SH15-type transformer has better economic and environmental benefits, and large capacity SH15 transformer better comprehensive benefits.
Advancements in organic nonvolatile memory devices
Xin Liu,ZhuoYu Ji,Ming Liu,LiWei Shang,DongMei Li,YueHua Dai
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4695-5
Abstract: As one of the most promising candidates for next generation storage media, organic memory devices have aroused worldwide research interest in both academia and industry. In recent years, organic memories have experienced rapid progress. We review the development of organic resistive switching memories in terms of structure, characteristics, materials used, and integration. Some basic concepts are discussed, as well as the obstacles hindering the development and possible commercialization of organic memory devices.
Nonvolatile memory devices based on organic field-effect transistors
Hong Wang,YingQuan Peng,ZhuoYu Ji,Ming Liu,LiWei Shang,XingHua Liu
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4240-y
Abstract: Among the many possible device configurations for organic memory devices, organic field-effect transistor (OFET) memory is an emerging technology with the potential to realize lightweight, low-cost, flexible charge storage media. In this feature article, the recent progress in the classes of OFET-based memory, including floating gate OFET memory, polymer electret OFET memory, ferroelectric OFET memory and several other kinds of OFET memories with unique configurations, are introduced. Finally, the prospects and problems of OFETs memory are discussed.
Remote sensing of algal blooms using a turbidity-free function for near-infrared and red signals
Yan Li,Shaoling Shang,Caiyun Zhang,Xiaoxin Ma,Liwei Huang,Jingyu Wu,Yindong Zeng
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-0464-2
Abstract: This article presents a method for real-time mapping of algal blooms in turbid coastal waters using the remote sensing reflectance of red band (Channel 1, 580–680 nm) and near-infrared band (Channel 2, 720–1100 nm) of the AVHRR sensor on the NOAA series satellites. A turbidity-free function for near-infrared and red signals, α 0 = (b b (1)/b b (2))(a (2)/a (1)) based on the first order b b/(a+b b) model deducing equation R rs (2)-1 = α 0 R rs (1)-1+g 1 (1-α 0), were selected as a chlorophyll-a related index for detecting algal blooms, and the algal blooms with chlorophyll-a concentration of 64–256 mg/L could be defined by window of 1.6 < α 0 < 5.2 and 0.01< R rs (2)/g < 0.2. Such turbidity-free two-band method is supported by both sea-truth data and remote sensing experiment for an algal blooms event on the near-shore water off the Minjiang estuary of southeastern China during early June of 2003. Comparisons of this algorithm with other published algorithms, one-band method (i.e. method of bright water) or two-band methods (i.e. method of ratio, method of NDVI, and method of subtracting) have suggested that the turbidity-free function method could be regarded as a standard algorithm in capabilities of AVHRR imagery or other high resolution but wide near-infrared and red band imagery for detecting algal blooms events in coastal waters.
The Many-on-One Stochastic Duel Model with Information-Sharing  [PDF]
Jianjun Li, Liwei Liu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.36097
Abstract: In this paper we extend the one-on-one stochastic duel model with searching to the many-on-one case based on information-sharing. We have derived the probability density function of the time to kill the target in many-on-one model. It is illustrated by an example in which the firing time and the searching time are of different exponential distributions.
Remote sensing of algal blooms using a turbidity-free function for near-infrared andred signals
Remote sensing of algal blooms using a turbidity-free function for near-infrared and red signals

LI Yan,SHANG Shaoling,ZHANG Caiyun,MA Xiaoxin,HUANG Liwei,WU Jingyu,ZENG Yindong,
LI
,Yan,SHANG,Shaoling,ZHANG,Caiyun,MA,Xiaoxin,HUANG,Liwei,WU,Jingyu,ZENG,Yindong

科学通报(英文版) , 2006,
Abstract: This article presents a method for real-time mapping of algal blooms in turbid coastal waters using the remote sensing reflectance of red band (Channel 1, 580–680 nm) and near-infrared band (Channel 2, 720–1100 nm) of the AVHRR sensor on the NOAA series satellites. A turbidity-free function for near-infrared and red signals, α 0 = (b b (1)/b b (2))(a (2)/a (1)) based on the first order b b/(a+b b) model deducing equation R rs (2)-1 = α 0 R rs (1)-1+g 1 (1-α 0), were selected as a chlorophyll-a related index for detecting algal blooms, and the algal blooms with chlorophyll-a concentration of 64–256 mg/L could be defined by window of 1.6 < α 0 < 5.2 and 0.01< R rs (2)/g < 0.2. Such turbidity-free two-band method is supported by both sea-truth data and remote sensing experiment for an algal blooms event on the near-shore water off the Minjiang estuary of southeastern China during early June of 2003. Comparisons of this algorithm with other published algorithms, one-band method (i.e. method of bright water) or two-band methods (i.e. method of ratio, method of NDVI, and method of subtracting) have suggested that the turbidity-free function method could be regarded as a standard algorithm in capabilities of AVHRR imagery or other high resolution but wide near-infrared and red band imagery for detecting algal blooms events in coastal waters.
A Qualitative Analysis on the Occurrence of Learned Helplessness among EFL Students
Liwei Hsu
Journal of Educational and Developmental Psychology , 2011, DOI: 10.5539/jedp.v1n1p162
Abstract: This study seeks to provide some comprehensive information on EFL students’ learned helplessness when learning English, by exploring the causal relationship between three variables: failure to learn English, personality traits and intrinsic/extrinsic motivation. Eighteen students and two English teachers participated in this study with a gatekeeper’s consent. This was done mainly through focus group interviews. The data was elicited from the NEO-FI Personality Trait Inventory with a cross analysis done on the in-depth interviews. The findings indicate that students with different personality traits do regard their failure to learn English in different ways. This in turn, leads to various influences that decrease their intrinsic motivation. The intrinsic motivation for all of the participants is inevitably affected by failure, but learners with a neuroticism trait are the most sensitive to failure. Therefore, these are the students who are most susceptible to experiencing learned helplessness when learning English, while students with traits of openness, extraversion and agreeableness can reactivate their extrinsic motivation when appealed to by external incentives. However, this study also discovered that there was a mismatch between a teacher’s judgment on student amotivation and the student’s self-assessment of his/her motivation to learn English.
Hemodynamic effects of partial splenic artery embolization in patients with liver cirrhosis and portal hypertension
DUAN Liwei
Journal of Clinical Hepatology , 2013,
Abstract: ObjectiveTo investigate the clinical efficacy and therapeutic value of partial splenic artery embolization (PSE) for treating portal hypertension in patients with liver cirrhosis. MethodsTwenty-three patients diagnosed with liver cirrhosis of different etiology and with portal hypertension were treated with PSE. Diameter and blood flow velocity of the portal vein (PV) and splenic vein (SV) were measured by color Doppler ultrasound before PSE (baseline) and after PSE (postoperative week 1 and months 1, 3, and 6). Statistical significance of differences was assessed by paired t-test. ResultsBoth the PV and SV blood flow velocities were significantly enhanced after PSE (all postoperative times vs. baseline, P<0.05). SV diameter was significantly reduced after PSE (all postoperative times vs. baseline, P<005). PV diameter, however, was not significantly reduced at six months after PSE (vs. baseline, P≥0.05). ConclusionPSE can reduce portal vein pressure in patients with liver cirrhosis.
Woman Subculture Development Seen from Woman Language
Liwei Zhu
Journal of Language Teaching and Research , 2011, DOI: 10.4304/jltr.2.3.613-617
Abstract: The woman subculture study is widely conducted through several decades since the beginning of the second wave feminist movement in 1960s. This paper intends to explain the woman subculture development in view of the woman language. First, it gives the definition of subculture. Second, it explains why woman culture is considered as a subculture. Third, with reference to sociolinguistic studies of woman language, it offers further clarification of some important feminist theories like gendered knowledge, standpoint theory and muted group theory. Also some key conceptions which are closely tied to woman subculture are expounded through the analysis of woman language. Last, the paper explains how woman subculture is transmitted through feminist theories and literary criticism works and how it is divided into three phases.
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