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Search Results: 1 - 10 of 32621 matches for " Leilei Huang "
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Some General Inequalities for Choquet Integral  [PDF]
Xiuli Yang, Xiaoqiu Song, Leilei Huang
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.614201
Abstract: With the development of fuzzy measure theory, the integral inequalities based on Sugeno integral are extensively investigated. We concern on the inequalities of Choquuet integral. The main purpose of this paper is to prove the H?lder inequality for any arbitrary fuzzy measure-based Choquet integral whenever any two of these integrated functions f, g and h are comonotone, and there are three weights. Then we prove Minkowski inequality and Lyapunov inequality for Choquet integral. Moreover, when any two of these integrated functions f1, f2, , fn are comonotone, we also obtain the Hölder inequality, Minkowski inequality and Lyapunov inequality hold for Choquet integral.
Integrating Webquest into Chemistry Classroom Teaching to Promote Students’ Critical Thinking  [PDF]
Qing Zhou, Leilei Ma, Na Huang, Qian Liang, Huiji Yue, Tao Peng
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.33058
Abstract: The WebQuest is a student-centered, inquiry-oriented and project-based approach for teaching and learning that students use Web resources to learn school topics. This article reports on the design, implementation and evaluation of a WebQuest teaching approach for chemistry classroom teaching in improving the critical thinking of high school students. A pre- and post-test design was used where 4-month long-term WebQuest teaching approach with five chemical topics was offered to 50 high school students aged ranged from 16 to 17 years in Xidian Middle School attached to Xidian University in Shaanxi province of China. The California Critical Thinking Disposition Inventory (CCTDI) and the California Critical Thinking Skills Test (CCTST) were employed as data collection tools. Both CCTDI and CCTST scores of the participants showed significant differences (p < 0.05) between before and after WebQuest learning. The subscale scores of CCTDI showed significant differences in all aspects of dispositions toward critical thinking except open-mindedness and maturity. For CCTST subscales, the scores showed significant differences in analysis and evaluation but in inference. These findings add to the evidence that integrating Webquest into science classroom teaching might be an effective way to develop high school students’ critical thinking.
Approximate Kepler’s Elliptic Orbits with the Relativistic Effects  [PDF]
Leilei Jia
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.31004
Abstract:

Beginning with a Lagrangian, we derived an approximate relativistic orbit equation which describes relativistic corrections to Keplerian orbits. The critical angular moment to guarantee the existence of periodic orbits is determined. An approximate relativistic Kepler’s elliptic orbit is illustrated by numerical simulation via a second-order perturbation method of averaging.

Sensing and Demodulation of Special Long-Period Fiber Gratings Induced by Scanning Laser Pulses
Tao Zhu,Leilei Shi,Min Liu,Wei Huang
Journal of Sensors , 2012, DOI: 10.1155/2012/539095
Abstract: A review of long-period fiber gratings (LPFGs) with special structures induced by scanning CO2 laser pulses in single mode fiber (SMF) is presented in this paper. In the first part, the special structures and fabrication methods of LPFGs are demonstrated in detail. Next, the special LPFG-based sensors are demonstrated, such as refractive index sensor, strain sensor with temperature compensation, and torsion sensor without temperature crosstalking. Finally, several investigation methods including intensity, wavelength shift, and fiber ring laser demodulation are discussed. 1. Introduction Long period fiber grating (LPFG) with a typical period of tens or hundreds of micrometers could couple the fundamental core mode to the cladding modes under the phase match condition, leaving a series of notches at some specific wavelengths in the transmission spectrum [9]. LPFG is more sensitive to the ambient perturbations than fiber Bragg grating (FBG) in which modes coupling takes place only between forward and backward core modes. So far, LPFG has been used for the measurements of refractive index, temperature, bending and torsion, and so forth. Many methods have been proposed to fabricate LPFG, such as ultraviolet (UV) laser exposure [9–13], electric-arc discharge [14–19], CO2 laser irradiation [2, 20–29], mechanical pressure [30–35], etched corrugations [36–39], ion beam implantation [40, 41], and femtosecond laser exposure [42–50]. Among them, UV laser exposure method is most popular owing to its easy fabrication, high repeatability, and mass fabrication of symmetric LPFGs. However, the requirement to the photosensitive fiber is the disadvantage of this method, leading to that the fabricated gratings cannot work over high temperature conditions (say, more than 250°C). Electric-arc discharge, mechanical pressure, etched corrugations, ion beam implantation, femtosecond laser exposure, and point CO2 laser or scanning CO2 laser irradiation all are asymmetric fabrication methods. Except for scanning CO2 laser method, other fabrication methods can not realize mass fabrication and high repetition grating fabrication. In particular, these methods also cannot fabricate special LPFGs with complicated index profile. Compared with other techniques, employing scanning CO2 laser pulses to fabricate LPFG is flexible and low-cost. This is because hydrogen loading and other additional process are not required and it is convenient to fabricate LPFGs with special refractive index modulation distribution [1, 3–7, 51–57]. It is important for LPFGs to enhance sensing sensitivity and
SEM STUDIES ON POLLEN GRAIN AND ANTHER MORPHOLOGY OF THE GENUS MAGNOLIA
木兰属几种药用植物花粉粒形态扫描电镜观察

Guo Chunlan,Huang Leilei,
郭春兰
,黄蕾蕾

植物科学学报 , 1996,
Abstract: The pollen grain and anther of five species of the genus Magnolia were observed by scaning electron microscopy.The general morphological features were as follows:The shape of the pollen grain are ball or ellipsoid possessing monocolpate or not;The surface are smooth and fine or rough;The anther's epidermal cell are spindle or columnar, arrange close together,and sculpture are striate.
Application of Improved Deep Auto-Encoder Network in Rolling Bearing Fault Diagnosis  [PDF]
Jian Di, Leilei Wang
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.67005
Abstract: Since the effectiveness of extracting fault features is not high under traditional bearing fault diagnosis method, a bearing fault diagnosis method based on Deep Auto-encoder Network (DAEN) optimized by Cloud Adaptive Particle Swarm Optimization (CAPSO) was proposed. On the basis of analyzing CAPSO and DAEN, the CAPSO-DAEN fault diagnosis model is built. The model uses the randomness and stability of CAPSO algorithm to optimize the connection weight of DAEN, to reduce the constraints on the weights and extract fault features adaptively. Finally, efficient and accurate fault diagnosis can be implemented with the Softmax classifier. The results of test show that the proposed method has higher diagnostic accuracy and more stable diagnosis results than those based on the DAEN, Support Vector Machine (SVM) and the Back Propagation algorithm (BP) under appropriate parameters.
Ultra-narrow Linewidth Fiber Laser with Self-injection Feedback Based on Rayleigh Backscattering
Tao Zhu,Shihong Huang,Leilei Shi,Lei Gao,Wei Huang,Baomei Zhang
Physics , 2014,
Abstract: A single longitudinal mode fiber laser with ultra-narrow linewidth based on self-injection feedback by using the linewidth compress mechanism of Rayleigh backscattering (RBS) are proposed and demonstrated. Since the linewidth of RBS is narrower than that of the incident light in optical fibers and they have the same centre wavelength, the RBS can act as a mechanism to compress the linewidth of the incident light in fiber ring laser. In addition, more RBS signal could be collected to help further compress the laser linewidth besides the free spectral range is expanded when the self-injection feedback method is used. Our experimental results show that the side-mode suppression ratio of our laser is up to 75dB and the laser linewidth could be low to ~130Hz.
Curcumin Inhibits Neuronal and Vascular Degeneration in Retina after Ischemia and Reperfusion Injury
Leilei Wang,Chuanzhou Li,Hao Guo,Timothy S. Kern,Kun Huang,Ling Zheng
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0023194
Abstract: Neuron loss, glial activation and vascular degeneration are common sequelae of ischemia-reperfusion (I/R) injury in ocular diseases. The present study was conducted to explore the ability of curcumin to inhibit retinal I/R injury, and to investigate underlying mechanisms of the drug effects.
68 Gbps quantum random number generation by measuring laser phase fluctuations
You-Qi Nie,Leilei Huang,Yang Liu,Frank Payne,Jun Zhang,Jian-Wei Pan
Computer Science , 2015, DOI: 10.1063/1.4922417
Abstract: The speed of a quantum random number generator is essential for practical applications, such as high-speed quantum key distribution systems. Here, we push the speed of a quantum random number generator to 68 Gbps by operating a laser around its threshold level. To achieve the rate, not only high-speed photodetector and high sampling rate are needed, but also a very stable interferometer is required. A practical interferometer with active feedback instead of common temperature control is developed to meet requirement of stability. Phase fluctuations of the laser are measured by the interferometer with a photodetector, and then digitalized to raw random numbers with a rate of 80 Gbps. The min-entropy of the raw data is evaluated by modeling the system and is used to quantify the quantum randomness of the raw data. The bias of the raw data caused by other signals, such as classical and detection noises, can be removed by Toeplitz-matrix hashing randomness extraction. The final random numbers can pass through the standard randomness tests. Our demonstration shows that high-speed quantum random number generators are ready for practical usage.
Finite difference/local discontinuous Galerkin method for solving the fractional diffusion-wave equation
Leilei Wei
Mathematics , 2015,
Abstract: In this paper a finite difference/local discontinuous Galerkin method for the fractional diffusion-wave equation is presented and analyzed. We first propose a new finite difference method to approximate the time fractional derivatives, and give a semidiscrete scheme in time with the truncation error $O((\Delta t)^2)$, where $\Delta t$ is the time step size. Further we develop a fully discrete scheme for the fractional diffusion-wave equation, and prove that the method is unconditionally stable and convergent with order $O(h^{k+1}+(\Delta t)^{2})$, where $k$ is the degree of piecewise polynomial. Extensive numerical examples are carried out to confirm the theoretical convergence rates.
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