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A high order curvature-compensated CMOS bandgap voltage reference(BGR) is presented in TSMC 0.35μm CMOS technology with low power low temperature-coefficient(TC) and high power supply rejection ratio(PSRR). The design is used in low dropout regulators which is applied in implanted chips. TC is compensated by adjusting resistor ratio which have different temperature characteristics. A PSRR enhance...
We manipulate the pore size of nanoporous polymeric photonic crystals using phase change between water and ice, demonstrating accurate post-manipulation of reflection resonances and thereby providing an approach to address grand challenges in nanomanufacturing and materials engineering.
We report an efficient strategy using extremely low-cost materials. Due to the excellent thermal insulation, a record thermal efficiency of ∼88% was obtained under one sun without concentration, corresponding to the evaporation rate of 1.28 kg/(m2·h).
Herein we fabricate highly reproducible-organometallic-halide-perovskite based devices, various device shapes that are hard to directly synthesize, unique properties and an improved photodetector have been successfully achieved. The advances will shed light on the practical applications.
We report perovskite CH3NH3PbBr3 nanolaser array with high density and uniform lasing wavelength on silicon. By transferring a perovskite microwire onto silicon grating, spatially periodic laser array is achieved without modifying the cavity and gain.
We present a complete description of “topological darkness” in a three-dimensional space regarding optical constants (i.e., n and k) of effective media, wavelengths and incident angles, which is essential for enhanced light-matter interaction in thin-films.
We demonstrate a strong enhancement of second harmonic generation based on a three-layered super absorbing metasurface consisting of a dielectric spacer layer sandwiched by an array of random metallic nanoparticles and a metal ground plate.
Based on in-depth research on the characteristics of the current train receiving and departure operations of China's railway stations, the urgent need of traffic standardization, automation and safety control and the status quo of the construction of the traffic command system in China, the overall scheme for the establishment of a TDCS/CTC-based train receiving and departure operation management-control...
Gyro-less attitude and angular rate estimations are of great importance in small, low-cost spacecraft, where high performance gyroscopes are not available due to multiple limitations. Recent development of accurate, high-bandwidth attitude sensors such as high data-rate star trackers, makes this approach implementable. The gyro-less estimator propagates the estimated states by nonlinear attitude dynamics...
In wireless network systems, time of arrival (TOA) scheme is always needed to implement the self-localization of the user manual. If multiple positions of interest exist, the Cramer-Rao lower bounds (CRLBs) of TOA localization in these positions are determined by the deployment of the base stations. The design of base station placement is addressed in this paper; and rather than the exhaustive method...
It is difficult to establish accurate mathematical models to describe the range extender electric vehicles due to the non-stationary, non-linear and interconnection of the monitoring signal sources resulted from the massive moving parts and complex architecture in range-extender. And the support vector machine (SVM) and other algorithms would lead to the destruction of the natural structure and the...
In this work, the scattering field excited by the perfect conducting quadratic surface is comprehensively studied. The numerical steepest descent path method (NSDP) is invoked to calculate the high oscillatory physical optics integral. Its result agrees very well with the Gordon's integral than asymptotical method. Moreover, the computation effort for the highly oscillatory integral is frequency independent...
Most modern search engines feature keyword based search interfaces. These interfaces are usually found on websites belonging to enterprises or governments or sites related to news articles, blogs and social media that contain a large corpus of documents. These collections of documents are not easily indexed by web search engines, and are considered as hidden web databases. These databases provide...
A large number of web databases are hidden behind form-based interfaces (consisting of interface components such as textboxes, drop-down boxes, etc) for users to enter their desired values in a search query. Form-based interfaces are not always easy to use and error-prone on mobile devices, mainly because of limitations such as smaller screen, trickier text input, etc. We build MobiFace which is a...
A tremendous amount of data is concealed behind form-based interfaces that communicate any user query to their data store to deliver query answer. These interfaces limit the number of retrieved search results to the top-k matching tuples that are sorted using a proprietary ranking function; the database owner may also impose constraints on the type of the processed queries. These limitations make...
This paper introduces a type of channel models especially suitable for demanding air interface evaluations like the case in many 5G communication systems will be. The map-based channel model is based on the digital information of the environment and uses a deterministic method to search for the propagation links. Most often used link calculation method is ray-tracing. Also here the examples are covered...
In this paper, we address privacy issues related to ranked retrieval model in web databases, each of which takes private attributes as part of input in the ranking function. Many web databases have both public attributes and private attributes which serve different purposes. The owners of web databases, which normally are websites, show the public attributes but keep private attributes invisible to...
This paper presents a method of inducing and navigation system based on multi path dynamic information feedback. The method analyses various sources of road information and extract the related characteristics of dynamic path induction by using trust evaluation of road conditions of real-time data sources. The navigation system consists of multidata filtering module, communication module, multi-channel...
This paper investigates the platoon control system with communication constraints such as variable communication delays, packets disorder, and access constraints in vehicular ad hoc networks. In order to address the communication constraints, the discrete-time variable sampling interval platoon model is established. An event-based control and scheduling (EBCS) codesign strategy that can robustly stabilize...
Test Suite Reduction is to find a subset of the original test suite which contains less test cases than original one but covers the same test request. In order to reduce the size of the data processed by Ant Colony Algorithm, this paper firstly chooses the test case set to form a candidate set. Then, based on the ant colony algorithm, QEA (Quantum-inspired Evolutionary Algorithm) and quantum revolving...
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