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We demonstrate nonreciprocal light propagation in microresonators based on Kerr-effect-mediated symmetry breaking between counterpropagating light. In proof-of-principle experiments, we realize isolators and circulators with more than 20 dB isolation.
We present a novel scheme for dual comb generation in a single microresonator using orthogonal polarization states. The generated frequency combs with slightly different mode spacing could enable compact optical sources for multi-heterodyne spectroscopy experiments.
Triple-comb pulses generated from one multi-wavelength mode-locked laser enable real-time microwave frequency measurement without the ‘dead-band’ limitation in previous dual-comb schemes. 1.5∗10−10 measurement accuracy is achieved at 20 GHz using a low-cost, compact fiber-optic setup.
We show both asynchronous and synchronous, dual-wavelength femtosecond pulse generation from an SWNT-mode-locked fiber laser by tailoring the intracavity anomalous dispersion, suggesting the effect of the mode-locker on pulse synchronization in the presence of dispersion.
A simple, self-starting and stable dual-wavelength-comb mode-locked fiber laser is realized with a dual-mode-fiber-based filter. The cost-effective, multimode interference fiber filter with low spectral modulation depth enables relatively wide spectral bandwidths in the mode-locking windows.
THz dual-comb spectroscopy using a free-running, dual-wavelength-comb fiber laser is demonstrated for highly cost-effective and compact THz spectroscopy systems while maintaining its high spectroscopic performance.
To take full advantages of Wide Bandgap power semiconductor devices, breakthroughs on power module development are heavily explored nowadays. This paper introduces a 1.2kV SiC half bridge intelligent power module utilizing 80μm flexible epoxy-resin as substrates instead of traditional Direct-bonded Copper, for better thermal-stress management and lower cost. The investigation on the flexible epoxy-resin...
Train-Ground wireless connection timeout is one of the common faults in Chinese Train Control System Level-3, and it will trigger a full-service brake application on high speed train. The paper presents a fault diagnosis method base on adaptive neuro-fuzzy inference system. First, a partition of universe and granularity for input and output are given. Moreover, a model is built and then trained by...
CMOS electronics constitutes the backbone of our information society. The extraordinary success of CMOS is based on the unique scaling properties of the Si MOSFET. Over the last decade, increasing concerns have been expressed about the ability of the Si MOSFET to continue its historical scaling path. This threatens the future of Moore's Law and its trifecta of benefits: cost, power and performance...
Shunt active power filters (S-APF) are highly popular ways for harmonic compensation due to the high performance and simplicity of installation. S-APF is commonly controlled in current control mode with load harmonic current detection, which is not quite suitable for the distributed power generation system (DPGS) where the nonlinear loads are highly dispersed. Local harmonic voltage detection based...
Batch-cell manipulation is a key technology in biological applications. Robotic manipulation has important significance to improve the operation success rate and reduce the technical threshold, but the problem of inefficiency still exists in batch-cell experiments. In this paper, an automated cell transportation system is designed for batch-cell manipulation. It has some technical aspects such as...
Asynchronous-optical-sampling THz-TDS using a free-running, dual-wavelength mode-locked fiber laser is demonstrated for highly cost-effective and compact THz spectrometer while maintaining its high spectroscopic performance.
Link prediction has become an important research topic in the field of complex networks. The purpose of link prediction is to find the missing links or predict the emergence of new links that do not present currently in a complex networks. Considering that the local centrality of common neighbor nodes have an important effect on the similarity-based algorithm, but every centrality measure has its...
This paper presents a 1kW power system model which consists of a boost converter fed by a stand-alone proton exchange membrane (PEM) fuel cell stack. A generic model of H- 1000 fuel cell stack is built with max voltage error ±1V as well as a dynamic model of the boost converter. The output voltage level of this power system is controlled by an adaptive fuzzy logic controller. the contribution in this...
Aiming at the existing problems in safety management of port enterprises, a standardized potential accident library and risk database is established by identification of dangerous or harmful factors and quantification of potential accident. Overall architecture of potential accident investigation and safety risk management system is put forward based on mobile intelligent terminal and PC terminal...
This paper focuses on indoor semantic segmentation using RGB-D data. Although the commonly used deconvolution networks (DeconvNet) have achieved impressive results on this task, we find there is still room for improvements in two aspects. One is about the boundary segmentation. DeconvNet aggregates large context to predict the label of each pixel, inherently limiting the segmentation precision of...
Edge detection had made significant progress with the help of deep Convolutional Networks (ConvNet). ConvNet based edge detectors approached human level performance on standard benchmarks. We provide a systematical study of these detector outputs, and show that they failed to accurately localize edges, which can be adversarial for tasks that require crisp edge inputs. In addition, we propose a novel...
The published papers on the journal of xi'an university of science and technology from 2007 to 2016 were collected from CNKI in this article. A total of 1511 papers were retrieved. These parameters were acquisited, such as title, author, organ, keyword, summary, PubTime, FirstDuty, fund, year, period, PageCount. Three LINUX servers were used to build Hadoop+Spark computing environment. By five aspects...
The Geostationary Interferometric Microwave Sounder (GIMS) is millimeter wave imaging sounder concept proposed for China's next generation geostationary meteorological satellite (FY-4M). GIMS is supposed to utilize a rotating circular thinned array, instead of a stationary Y-shape array, to reduce the required number of the antenna elements. A proof-of-concept 53GHz ground-based GIMS demonstrator...
Traditional spatio-temporal data model (STDM) is based on relational database, it is hard to convert problem domain model to relational model, which result in complicated query and low expansibility. In this regard, we propose the spatio-temporal data model based on graph database. The data model integrates TGIS's three key elements: space, time and attributes, and expressed spatio-temporal characteristics...
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