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In the application of household refrigerator, the linear compressor is popularly adopted due to its no crank mechanism and directly oscillated by the inside drive machine and the helical coil springs.
Human resource plays an essential role in the sustainable development of modern industry, especially the talent-intensive industries. Evaluating the human resource competitiveness is the basis for quantifying industrial competitiveness and shaping development strategies. In this study, an improved Technique for Order Preferences by Similarity to an Ideal Solution (TOPSIS) method is developed to evaluate...
This paper presents a terahertz (THz) spectrometer based on high temperature superconducting Josephson junction. The YBa2Cu3O7 (YBCO) bi-crystal Josephson junctions (JJS) with log-periodic antennas are used as detectors. In the low temperature, with the signal measurement, data acquisition and human-computer interactive system, the automatic measurement system of THz spectrometer is finally accomplished...
Discriminating exo-atmosphere micro-motion targets is a key technology for precise guidance systems, infrared surveillance systems, and satellite remote sensing systems. Commonly, static IR images are insufficient to discriminate different targets in the field of view. The infrared signature, i.e., the time sequence of the target point's gray level in the infrared images serve as potential discriminants...
As an important passive sensing technology, infrared sensor has been used in satellite remote sensing systems to discriminate exo-atmosphere targets. At a long range, even relatively large objects are represented as single pixels on the IR image. The infrared signature, i.e., the time sequence of the target point's gray level serves as potential discriminants and has been used in many systems to classify...
Electromigration (EM) and Joule heating effect associated with un-silicided (U-S) N+ poly were explored based on 40nm technology node. It is found that void caused by electromigration was formed in the metal over contact which is connected to U-S N+ poly. Joule heating of U-S N+ poly with different sizes and structures was investigated by the method of temperature coefficient of resistance (TCR),...
When applying high-temperature superconductor (HTS) devices in power systems, ac loss is a significant obstacle from an economic perspective. Many studies have been performed to investigate this issue, but the ac losses for different current waveforms have rarely been reported. However, in power systems, many nonlinear devices can distort current waveforms. For example, currents of converters have...
This paper firstly presents three topologies of DC distribution networks: radial topology, ring topology and “hand-in-hand” topology. Then an analytical method and the Monte Carlo simulation method for calculation of the reliability index of the three topologies are used to calculate the reliability index of the three types of DC distribution networks. The analytical method is based on the failure...
The high power permanent magnet (PM) traction drive has recently been highlighted due to its promising qualities such as high efficiency and power density. For better performance, a robust, efficient and reliable control and driving scheme needs to be designed. In this Paper a control scheme is designed which based on Most Torque Per Ampere (MTPA) strategy to obtain high power density and is specially...
Traffic signal control is an effective way of solving urban traffic problems by providing appropriate signal control plans for various intersections. Essentially, the aim of Traffic Signal Control is to find the best matching timing plan to current traffic conditions. Inspired by recommendation technology, we regard traffic conditions as users, timing plans as items, and traffic indicators like delay...
We report much improved color gamut liquid crystal displays (LCDs) with specially engineered low-reabsorption, narrow emission spectrum and high quantum yield colloidal quantum-dot light converting device (QLCD) and its applications to TV displays. By theoretical and experimental optimizations, color gamut as wide as 120% NTSC standard is demonstrated. QCLD has also been tested for stability under...
This paper reports an electrostatically actuated single crystal 4H-SiC cantilever performing frequency mixing. In order to achieve electrostatic actuation, and solve the challenge of releasing MEMS structures due to the extreme chemical hardness of 4H-SiC, an n-p-n homoepitaxial structure was chosen, with cantilever actuators released by photoelectrochemical (PEC) etching. The middle p-SiC layer acts...
The permanent magnet vernier machine (PMVM) has been proposed as a suitable alternative for direct-drive applications due to its high torque feature at a low operated speed, where the usage of high-torque low-speed motor can effectively eliminate the additional cost and losses caused by gearbox. One effective design as a dual-stator PMVM with spoke-type PMs in rotor has been developed for both high...
In general, the conventional permanent magnet (PM) linear machine can reduce the energy conversion steps by eliminating the rotary to linear conversion mechanism which in turn reduces the maintenance cost in the wave energy extraction, while it suffers from bulky size due to a large number of poles for low speed operation. Therefore, the permanent magnet linear vernier machine has been regarded as...
With the rapid growth of the number of urban vehicles, it will be not advisable to alleviate traffic congestion by changing the traffic facilities only. And the traditional control strategies for single intersection or regional multiple intersections have been confirmed to have some effect in the past few decades, but still need to be improved. Based on ACP (Artificial societies, Computational experiments,...
The increased ownership of motor vehicles has brought many urban problems, such as traffic congestion, environmental pollution. Traffic signal control is recognized as one of effective ways to alleviate these problems. However, it is still hard to automatically choose appropriate traffic signal timing plans for different traffic conditions due to the dynamics and uncertainty of transportation systems...
This paper focuses on the application of recommendation systems through the perspective of best matching between users and items. After reviewing the traditional recommendation systems and their application areas, this paper then extends recommendation systems to some other areas which may need recommendation systems to solve some key problems. Not only the application areas are extended, but also...
In this work, we apply the PD-type iterative learning control method to address the traffic density control problem in a microscopic level freeway environment with ramp metering. Here the traffic density control problem is an output tracking problem with an appropriate tracking objective. In order to verify the effectiveness of proposed method, we perform comparison experiments on the microscopic...
Grassland ecosystem is one of the most important terrestrial ecosystems in China. Grassland aboveground biomass (AGB) is not only the material base for maintaining grassland ecosystem, but also the most direct indicator to reflect grassland status. AGB determines the herbivore carrying capacity in grassland ecosystem. Therefore, it is important significance to retrieve AGB to study the regional carbon...
Choosing a polarimetric radar detector which exhibits well on detection performance and is easy to implement simultaneously is significant to the polarimetric radar target detection in reality. In this paper, we analyze and compare the detection performances and implementation difficulties of optimal polarimetric detector (OPD), polarimetric whitening filter (PWF), optimal span detector (OSD), polarimetric...
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