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Both size and distribution of oil mist droplet diameter are important factors for weighing atomized quality of oil mist in lubrication. However, because of the peculiarity of oil mist droplet, it is difficult to obtain its exact dimension. This article selects laser particle sizer which is based on the scattering theory of light to measure size and its distribution of oil mist droplet diameter. At...
This paper present a wavelet-packet approach for extracting feature from ultrasonic non-destructive evaluation data of a test multi-layer adhesive structure specimen. These features are then used to obtain an estimate of the specimen's bonded properties. When the multi-layer adhesive structure undergo ultrasonic non-destructive evaluation, echo from interior layers often overlap severely, causing...
This paper presents an expanding products algorithm of logic optimization that is based on multi-input multi-output logic functions. According to input products, we work out complement sets matrix of non-shared products, blocking matrix, covering matrix. For blocking matrix and covering matrix, we get mini column cover sets and upgrade sets based on choice algorithm of mini column cover. Then we form...
Metals, as sheets, are potential candidates for bipolar plate materials of proton exchange membrane fuel cell (PEMFC). However, metal oxide formation and metal dissolution under operating conditions of PEMFC cause considerable power degradation, which can be solved by coating metallic plates with corrosion resistant and electrically conducting layers. Conductive polymer coatings have potential for...
Educational informationization is the basis of the educational modernization. Modern information technologies (IT) such as computer multi-media technology, network technology, information conversion, storage and other technologies have been introduced to the field of education in part, and to achieve a rational allocation, development and utilization of education information resources. The paper researches...
Since the doubly fed induction generator (DFIG) converters are designed by the slip power (a fraction 25-30% of the total power) to achieve full control of the generator, there is not enough capacity to provide reactive power when the voltage dips below the tolerable grid voltage level at the point of common coupling (PCC). We propose in this paper to use the static synchronous compensator (STATCOM)...
Desertification causes extensive concern of international academia for its development speed and serious calamity. Based on dynamic analysis of remote sensing data in different time and relationships between desertification and drive factors, a method how to build up desertification simulation model based on cellular automata with the help of GIS (geographic information system), RS(remote sensing)...
Inverse synthetic aperture radar (ISAR) imaging of multiple warhead targets in the same antenna beam is a big challenge when they are overlapping in the same range bin. Existing methods are usually based on single target motion compensation and they can't get clear ISAR image of multiple targets. This paper presents a new algorithm for ISAR imaging of multiple targets based on Fractional Fourier Transform...
This paper investigates the failure prediction problem for multivariable and multi-failure-mode complex systems based on performance degradation. In our treatment, neural network is employed to simulate system performance degradation and to predict the health states of functional modules. BP network and Learning Vector Quantization (LVQ) network are used simultaneously to simulate and to predict future...
The harmonic levels in 220 kV Gong Ping power station are much higher above the standard because of the load of the electric railway traction substation. Voltage pollution was serious and the substation was long-running in the state of unqualified voltage, it is necessary to install filtering equipment. In this paper, measures of the harmonic suppression are put forward, which are reasonably choosing...
CFD numerical simulation has often been performed to analyze the characteristics of the fluid field and design the measurement device like flowmeter. It needs parallel compute to improve the efficiency. The most important factor in distributed computing is cost and the small scale cluster with multi-core CPU is very feasible for parallel computation of CFD simulation. A small scale cluster with multi-core...
In this paper the issue of image segmentation within the framework of toboggan algorithm in combination with random walk based techniques is addressed. First, a graph is created which decomposes the image in scale and space using the concept of toboggan. In this way, we consider each of the regions as the nodes, the weights between graph-nodes is estimated by using the law of universal gravity. Then...
Simulation is an important method in the research and development of storage and network system. A good simulator can save memory and times. There are many simulators developed, but most of those simulator aimed at performance and data schedule algorithm. None of those simulators can model manipuility and dependability in large scale storage network. In this paper, we present the facilities and design...
The oriental migratory locust plagues has became a serious problem during the last two decades. Remote sensing techniques can greatly facilitate monitoring locust population dynamics over a large geographic scale. In this paper, a model is presented to estimate leaf area index (LAI) of reed canopy from TM or ETM+ image data firstly. The model classifies the background of reed canopy into soil and...
To investigate the characteristics of fat metabolism in rat skeletal muscle after hypobaric hypoxia acclimation. Sprague-Dawley rats were divided into 3 groups randomly: control group (H0), hypoxic 5-day group (H5), and hypoxic 15-day group (H15). Animals of H5 and 15 groups were exposed to hypobaric hypoxia chamber simulating 5 000 m high altitude for 5 d or 15 d respectively, 23 h per day. H0...
The design of Si/SiGe HBT for high-frequency microwave power amplification was presented in this paper. The material profile structure of the device was designed. A comb liked structure with 6-fingered emitter was employed for the SiGe HBT. Then the device was fabricated by using the buried metal self-aligned double mesa process and high resistivity substrate in a 3 ??m manufacture process line. The...
In this paper, we present a space-time algorithm to estimate the carrier frequency, azimuth and elevation angles of multiple independent sources based on arbitrary array. The algorithm transfers the observed data from space domain to 2-D space-time domain by exploiting the cross-correlation of the array outputs, constructs space-time cross-correlation matrixes. The algorithm only needs three guiding...
Chip multiprocessor (CMP) will become more popular in embedded systems. As clock frequency increases, dependency among core blocks rises, which therefore tends to reduce performance of system and be more unstable. Redundancy is a way to improve the dependability of the system. But the traditional methods cannot make full use of the computing capacity of CMP. In this paper, we propose a new redundancy...
This paper studies optimization problem of materials procurement, storage in construction projects. With the thought of operations research, it designs objective function and constrained conditions for a materials procurement and storage optimization model. To testify the model, a specific project is studied. According to historical market data, it simulates the target cost while the factors such...
A new method is proposed to provide to estimation direction arrival of signal received without any Doppler frequency information. The paper propose and analyze a new algorithm called adaptive blind Doppler estimate algorithm based on Doppler orthogonalized. The efficient of algorithm is confirmed by theory analyze and computer simulations.
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