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The diocotron instability of a relativistic sheet electron beam propagating through a uniform magnetic field is studied using a macroscopic cold fluid model. The general eigenvalue equation is obtained for low-frequency perturbations. In the limit of a long axial wavelength, a dispersion relation is derived for the special case of a sharp boundary density profile and used to study stability properties...
The proposed strategic procedure in the paper should provide a guideline for enterprises to develop their E-commerce strategy. It has been compiled by the author's training and experience of both management and technical issues. Six general steps are mainly discussed in this procedure: Making the initial decision to offer E-Commerce, Identifying the business aims for E-Commerce, Analyzing the feasibility...
Under the bottleneck of the resources and the environment, if the Western path of modernization is followed, the prospects of China will be dim. The volume of CO2 emission is huge and the growth has been fast in China, posing challenges for mitigation. The development of low-carbon economy is an inevitable choice for change strong. Market capacity, innovation capability and enterprises' fast transition...
Ozonation of dimethylamine (DMA), the most direct and common precursor of high carcinogenic disinfection by-product N-nitrosodimethylamine (NDMA), in aqueous solutions and in the presence of H2O2 was studied at ozone doses of 1.8 mg/L. The removal ratio of DMA increases from 46.7% to 77.1% with the dosage of H2O2 increasing from 0 to 1 mM, and the removal rate can be improved by increasing pH. According...
In order to solve the problem of "information isolated island" among e-government platform, it's urgent to build a safe, reliable, efficient, and stable platform for information sharing for resource integration of today's e-government. This paper analyses problems in the development of traditional e-government, describes the SOA (service-oriented architecture) and its related technologies...
Testing method by velocity of stress wave is widely used in the nondestructive testing system of strength of wood-based panel. Considering higher and higher requirement of accuracy on the testing system, the research developed testing system of stress wave velocity based on SCM in this paper. SCM is used as processing corn. The research calculated dynamic elastic modulus of wood-based panel, which...
A spurious-mode-suppressing method is introduced in this paper, aiming at increasing frequency interval between operating mode (TM310 mode) and spurious mode (TM020 mode). By means of CST-MWS, we find that the frequency interval can be increased 0.65 GHz in X-band by the method.
A spectrometer is used to measure numerical aperture (NA) of photonic crystal fibers (PCFs), and the high-precision result is obtained. We get the NA at any wavelength in 500∼900nm range, which is determined by light source and spectrometer. The measured results and theoretical calculation value match very well.
In this paper, the numerical aperture (NA) of photonic crystal fiber (PCF) is measured by a system with spectrometer, and high-precision results are obtained. The spectrometer can record the light intensity of different wavelengths. It overcomes the limitation that the traditional measurement can only measure the NA in some fixed wavelengths. We get the NA at any wavelength in 500nm∼900nm range, which...
In this paper, we propose a novel information utility description for bearings-only sensors to meet the challenge of sensor arrangement in Wireless Sensor Networks (WSN) for tracking. In order to reduce calculation, we use the probability distribution function of the predicted target state, the sensing model and the position information of sensors to define information utility, thus avoiding the computationally...
Neighborhood Preserving Embedding (NPE) is an unsupervised linear dimensionality reduction technique which attempts to solve the ldquoout of samplerdquo problem in Locally Linear Embedding (LLE). This is done by introducing a linear transform matrix into LLE, and hence NPE can be perceived as a linear approximation to LLE. In this paper, we modify the original NPE for face recognition by embedding...
In this paper, a real-time vision-based safety assist system is proposed to provide the driver an assistance system improving the security on driving and after parking. The estimated distances and a friendly intuitive graph are shown on the screen for drivers to examine the distance between other vehicles. The driving status can also be recorded in H.264. Furthermore, the users' mobile phones can...
In this paper, we present two approaches to define fuzzy sublattice. Firstly, by the use of the relations between fuzzy points and fuzzy subsets, definition of (szligmacr,alphamacr) fuzzy sublattice is given. We have shown that the acceptable non-trival concepts obtained in this manner are the (isin,isin)-fuzzy sublattice, (isin,isinnuq)-fuzzy sublattice and (isinmacr,isinmacrnuqmacr)-fuzzy sublattice...
Face images are often very high-dimensional and complex. However, the actual underlying structure can be characterized by a small number of features. Hence, locally linear embedding (LLE) is proposed as a nonlinear dimension reduction technique to deal this problem. LLE learns the intrinsic manifold embedded in the high dimensional ambient space by minimizing the global reconstruction error of the...
In this paper, an e-learning system model which supported the four-tier system architecture and agent technology are introduced into network education, and the construction of high-efficiency, high-performance e-learning platform is useful attempted. In addition, a remote distance learning system based on agent is constructed and at present the system has already improved the system load capacity,...
Locally Linear Embedding (LLE), which has recently emerged as a powerful face feature descriptor, suffers from a limitation. That is class-specific information of data is lacked of during face analysis. Thus, we propose a supervised LLE technique, known as class-label Locally Linear Embedding (cLLE), to overcome the problem. cLLE is able to discover the nonlinearity of high-dimensional face data by...
In this paper, a method for predicting the electromagnetic vibration of PM brushless motors is presented. It has accounted for both PM blushless AC and DC motors. It calculates the electromagnetic force on individual stator teeth by the Maxwell stress method, based on 2-D finite element analysis of the electromagnetic field. The resulting radial force contour is then used in an analytical mechanical...
This paper presents a face recognition technique with two techniques: random projection (RP) and robust linear discriminant analysis model (RDM). RDM is an enhanced version of fisher's linear discriminant with energy-adaptive regularization criteria. It is able to yield better discrimination performance. Same as Fisher's Linear Discriminant, it also faces the singularity problem of within-class scatter...
Convolution kernels, such as tree kernel and subsequence kernel are useful for natural language processing tasks. However, most of them ignore the semantic knowledge. In order to solve the problem, this paper proposes a new method to embed the semantic knowledge into kernel calculation. The new method has been applied to extract the ORG-affiliation relation from Chinese texts and achieves an average...
Summarization can facilitate users to acquire large amount of information. This paper introduces a Chinese news events summarization system based on a predefined template. The system automatically collects query-related news online, applies Language model to detect event related information, calculates word frequencies based on semantic meaning and uses information fusion techniques to merge the results...
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