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Granules locate in the solar photosphere and are bright cellular patterns, which are surrounded by dark intergranular lanes. They are viewed to be the visible manifestation of the solar convective zone. Studying the cellular patterns is important to understand the convective motions in the solar photosphere. In this paper, we presented a new method based on phase congruency technique for identifying...
A sunspot usually consists of a relatively dark region, called umbra, and a region surrounding the umbra, called penumbra. The penumbra includes various fine structures, like bright filaments and dark fibrils. Small and bright penumbral grains locate on the bright filaments. Studying the physical properties of penumbral grains can help us to better understand magnetic field motions in a penumbra and...
This paper reports a single-step and cost-effective method to fabricate ultrathin Poly(dimethylsiloxane) (PDMS) membrane with honeycomb-like nanostructure on silicon substrate. The method is based on the template prepared by colloidal nanoparticles self-assembly. The thickness and nanostructure of the membrane are both determined by the size and surface morphology of two dimensional colloidal nanoparticles...
A discharge system with jagged electrodes gap fabricated by MEMS fabrication technique was proposed in this paper. By utilizing a voltage multiplier as energy accumulation module, repeatedly spark breakdown in air was performed through this designed electrodes. Finite element analysis has been done for simulating the arc generation. The device was fabricated by MEMS process and relative experiments...
Diffusion Tensor Imaging (DTI) may soon become the noninvasive tool of choice for diagnosing Traumatic Brain Injury (TBI) due to its ability to examine white matter changes in the living brain. While research has shown the value of DTI in differentiating affected and control populations, further work is required to develop algorithms and tools that enable reliable and reproducible methods for obtaining...
Graphics processing units(GPUs) provide a low cost platform for accelerating high performance computations. New programming languages, such as CUDA and OpenCL, make GPU programming attractive to programmers. However, programming GPUs is still a cumbersome task for two reasons, tedious performance optimizations and lack of portability. First, optimizing an algorithm for a specific GPU is a time-consuming...
This paper presents the design and testing results of an electrothermally driven MEMS (microelectromechanical systems) actuator. Different from conventional uni-directional thermal actuators, this in-plane bi-directional electrothermal actuator is capable of producing displacements in two directions as a single device. The RF MEMS switch driven by this cascaded electrothermal actuator is also proposed...
According to the characteristics of Chinese characters image, we propose an improved corner detection method based on Harris algorithm and the ideal of FAST to improve detection rate for next feature extraction in this paper. First, the image of Chinese characters is detected for corners using Harris algorithm. Second, using the FAST for reference, the false corners are removed. The corners founded...
The theory, design, fabrication and measurements of a novel tunable equalizer for adjusting the microwave signals based on RF MEMS switches are presented. The novelty of the tunable equalizer is the RF MEMS switches and the thick CPW line with released signal and ground sections based on the MEMS technology. This equalizer adjusts the attenuation curve by the RF MEMS switches and makes the power of...
The theory, design, fabrication and measurements of a novel tunable equalizer for adjusting the microwave signals based on RF MEMS switches are presented. The novelty of the tunable equalizer is the RF MEMS switches and the thick CPW line with released signal and ground sections based on the MEMS technology. This equalizer adjusts the attenuation curve by the RF MEMS switches and makes the power of...
In order to deal with the problem of access network selection in the next generation wireless networks, it is necessary to develop an adequate model for its selection. This paper presents the proposal of optimal network selection algorithm in wireless heterogeneous environment that is based on reputation model. It not only considers the users' preferences, but also the results of network admission...
In order to make the cloud manufacturing resources into the manufacturing cloud, and to thoroughly resolve tight coupling dependencies between the physical manufacturing resources and the application services, and to support the building environment of virtual cloud manufacturing services, this paper analyzes characteristics and classification of the generalized manufacturing resources in the networked...
Aiming at the AVS standard which is the audio and video standard of China, an optimized variable length code decoder is proposed for the AVS standard. The design uses an innovative circular shifter to improve decoding parallelism. It optimizes the VLC tables and uses combinational look-up table circuit to avoid memory access. Self-adaptive pipeline technique is adopted to improve decoding speed. The...
In this paper, a micro-rotating structure for determining thermal expansion coefficients (TEC) of polysilicon thin films is presented. An analytical expression is derived to relate the thermal expansion coefficient of the polysilicon thin film with the lateral displacement, geometrical parameters and the temperature of the test structure. The finite element analysis results and experimental results...
This paper presentsa novel in-situ test structure for determining Young's modulus and Poisson's ratio of polysilicon thin films, based on electrostatic driving mechanism. The test structure manufactured with polysilicon surface processes, include two parts, one is used for the measurement of Young's modulus, and the other is used for the measurement of Poisson's ratio. By monitoring the deflection...
This paper first analyzes the problems in the tourist market in the five Northeastern cities in China (Changchun, Dalian, Harbin, Jilin City, Shenyang), and then constructs the tourist satisfaction indicators and the tourist satisfaction model, and finally conducts empirical analysis on the data from comments on the internet. It is evident from the results of these analyses that the overall rating...
A novel signal processing method, called sensitive frequency band (SFB) selection, is proposed based on the correlation coefficients between the original signal and its reconstructed approximation and detail parts. By identifying the noised-related and fault-related SFBs, the SFB selection method can be used to reduce noise and extract fault feature effectively for a signal. This method is applied...
A new book-lending system is designed and analyzed based on logic Petri nets in this paper. The batch processing function and indeterminacy of readers are included in the system. Its logic Petri net model is established and some important properties of the system are verified based on the model.
The relation of PIM power versus input power is presented, and the third order PIM product is predicted. The agreeable PIM power versus input power curve is obtained by regulating the polynomial coefficients. Comparing fitting results with the measured data for cable connectors in mobile communication systems, we verify the correctness and feasibility of the proposed scheme. Moreover, the time dependency...
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