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Articles 451 - 462 of 462
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Periodic Topology Optimization Of A Stacker Crane, Hongyu Jiao, Feng Li, Zhengyi Jiang, Ying Li, Zhao Yu
Periodic Topology Optimization Of A Stacker Crane, Hongyu Jiao, Feng Li, Zhengyi Jiang, Ying Li, Zhao Yu
Faculty of Engineering and Information Sciences - Papers: Part B
© 2013 IEEE. The stacker crane is a long-and-thin structure with a large length-to-width ratio. It is difficult to obtain a topology configuration with good period properties using traditional optimization methods. While the mathematical model of periodic topology optimization - in which the elements' relative densities are selected as design variables, and mean compliance as the objective function - is established. To find a topology configuration with a good period property, an additional constraint condition must be imported into the mathematical model. According to the optimization criteria method, the iterative formula of design variables is derived in the virtual sub …
Achieving High Resolution Measurement Using Laser Diode Operating At Period One, Yuxi Ruan, Bairun Nie, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Zhuqiu Chen
Achieving High Resolution Measurement Using Laser Diode Operating At Period One, Yuxi Ruan, Bairun Nie, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Zhuqiu Chen
Faculty of Engineering and Information Sciences - Papers: Part B
Copyright 2019 SPIE. When a part of light emitted by a laser is back-reflected or back-scattered from an external target and re-enters the laser cavity, both the laser intensity and its wavelength can be modulated. This is so-called self-mixing effect (SME), the optical feedback interferometry (OFI) utilizes such effect in an LD developed various applications. In this paper, we use a dualcavity OFI system that operating in period one state, the laser intensity from this system exhibits an oscillation with its amplitude modulated by a traditional single cavity OFI signal. The dual-cavity OFI system has the same measurement resolution as …
Effect Of Windowing On A Sensing Signal Generated By Self-Mixing Interferometry, Han Wang, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong
Effect Of Windowing On A Sensing Signal Generated By Self-Mixing Interferometry, Han Wang, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong
Faculty of Engineering and Information Sciences - Papers: Part B
Copyright 2019 SPIE. The laser diode (LD) is modulated by the injection current of triangular waveform and a photo diode (PD) is packaged in the rear of the LD. The laser reflected by the target re-enters the cavity of LD and contains the target's displacement information. The information is carried within the laser intensity and can be pickup by the PD. We call this laser intensity as self-mixing interferometry (SMI) signal. While processing the sensing SMI signals, we should carefully determine the windowing function and reduce the effect of windowing in the FFT and IFFT process while applying the mathematical …
A Two-Layer Channel Access Approach For Rf-Energy Harvesting Networks, Hang Yu, Kwan-Wu Chin
A Two-Layer Channel Access Approach For Rf-Energy Harvesting Networks, Hang Yu, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part B
2013 IEEE. We consider a Hybrid Access Point (HAP) that charges one or more energy harvesting devices via Radio Frequency (RF). These devices then transmit their data to the HAP. To date, prior works assume devices use Time Division Multiple Access (TDMA) for channel access, and these devices are able to transmit using any amounts of harvested energy. By contrast, we consider Dynamic Framed Slotted Aloha (DFSA) and devices can only transmit if they have sufficient energy. Moreover, nodes are not aware of each other's energy level, meaning the HAP and devices are unaware of the number of devices that …
High-Performance K-Co2 Batteries Based On Metal-Free Carbon Electrocatalysts, Wenchao Zhang, Chuangang Hu, Zaiping Guo, Liming Dai
High-Performance K-Co2 Batteries Based On Metal-Free Carbon Electrocatalysts, Wenchao Zhang, Chuangang Hu, Zaiping Guo, Liming Dai
Faculty of Engineering and Information Sciences - Papers: Part B
2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Metal-CO2 batteries have attracted much attention owing to their high energy density and use of greenhouse CO2 waste as the energy source. However, the increasing cost of lithium and the low discharge potential of Na-CO2 batteries create obstacles for practical applications of Li/Na-CO2 batteries. Recently, earth-abundant potassium ions have attracted considerable interest as fast ionic charge carriers for electrochemical energy storage. Herein, we report the first K-CO2 battery with a carbon-based metal-free electrocatalyst. The battery shows a higher theoretical discharge potential (E⊖=2.48 V) than that of Na-CO2 batteries (E⊖=2.35 V) and can …
Numerically Pricing Convertible Bonds Under Stochastic Volatility Or Stochastic Interest Rate With An Adi-Based Predictor-Corrector Scheme, Sha Lin, Song-Ping Zhu
Numerically Pricing Convertible Bonds Under Stochastic Volatility Or Stochastic Interest Rate With An Adi-Based Predictor-Corrector Scheme, Sha Lin, Song-Ping Zhu
Faculty of Engineering and Information Sciences - Papers: Part B
2019 Elsevier Ltd In this paper, the pricing problem for the American-style convertible bonds with the Heston stochastic volatility and that with the Cox-Ingersoll-Ross (CIR) stochastic interest rate are both considered. Due to the complexity of both problems, resulting from an additional stochastic factor, it is almost impossible to find any analytical solution. Therefore, a predictor-corrector scheme is chosen as the numerical scheme to solve the partial differential equations (PDEs), with the Douglas-Rachford (D-R) method being utilized as one of the Alternating Direction Implicit (ADI) methods for the correction step to obtain the numerical solution. Finally, the accuracy of our …
Untwisting Twisted Spectral Triples, Magnus Goffeng, Bram Mesland, Adam C. Rennie
Untwisting Twisted Spectral Triples, Magnus Goffeng, Bram Mesland, Adam C. Rennie
Faculty of Engineering and Information Sciences - Papers: Part B
2019 World Scientific Publishing Company. We examine the index data associated to twisted spectral triples and higher order spectral triples. In particular, we show that a Lipschitz regular twisted spectral triple can always be "logarithmically dampened" through functional calculus, to obtain an ordinary (i.e. untwisted) spectral triple. The same procedure turns higher order spectral triples into spectral triples. We provide examples of highly regular twisted spectral triples with nontrivial index data for which Moscovici's ansatz for a twisted local index formula is identically zero.
A Lightweight Privacy-Preserving Fair Meeting Location Determination Scheme, Hua Shen, Mingwu Zhang, Hao Wang, Fuchun Guo, Willy Susilo
A Lightweight Privacy-Preserving Fair Meeting Location Determination Scheme, Hua Shen, Mingwu Zhang, Hao Wang, Fuchun Guo, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part B
Equipped with mobile devices, people relied on location-based services can expediently and reasonably organize their activities. But location information may disclose people's sensitive information, such as interests, health status. Besides, the limited resources of mobile devices restrict the further development of location-based services. In this paper, aiming at the fair meeting position determination service, we design a lightweight privacy-preserving solution. In our scheme, mobile users only need to submit service requests. A cloud server and a location services provider are responsible for service response, where the cloud server achieves most of the calculation, and the location services provider determines the …
Facilitating Application-Aware Bandwidth Allocation In The Cloud With One-Step-Ahead Traffic Information, Dian Shen, Junzhou Luo, Fang Dong, Jiahui Jin, Junxue Zhang, Jun Shen
Facilitating Application-Aware Bandwidth Allocation In The Cloud With One-Step-Ahead Traffic Information, Dian Shen, Junzhou Luo, Fang Dong, Jiahui Jin, Junxue Zhang, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part B
Bandwidth allocation to virtual machines (VMs) has a significant impact on the performance of communication-intensive big data applications hosted in VMs. It is crucial to accurately determine how much bandwidth to be reserved for VMs and when to adjust it. Past approaches typically resort to predicting the long-term network demands of applications for bandwidth allocation. However, lacking of prediction accuracy, these methods lead to the unpredictable application performance. Recently, it is conceded that the network demands of applications can only be accurately derived right before each of their execution phases. Hence, it is challenging to timely allocate the bandwidth to …
Effect Of Particle Size On Microstructure And Element Diffusion At The Interface Of Tungsten Carbide/High Strength Steel Composites, Hongmei Zhang, Hongnan Li, Ling Yan, Chao Wang, Fangfang Ai, Yan Li, Nan Li, Zhengyi Jiang
Effect Of Particle Size On Microstructure And Element Diffusion At The Interface Of Tungsten Carbide/High Strength Steel Composites, Hongmei Zhang, Hongnan Li, Ling Yan, Chao Wang, Fangfang Ai, Yan Li, Nan Li, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
The microstructure and micro-hardness of tungsten carbide/high strength steel (WC/HSS) composites with different particle sizes were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), ultra-high temperature laser confocal microscopy (UTLCM) and micro-hardness testing. The composites were prepared by cold pressing and vacuum sintering. The results show that WC density tends to increase as the average grain size of WC decreases and the micro-hardness of WC increases with the decrease of WC particle size. The micro-hardness of WC near the bonding interface is higher than that in other regions. When the particle size of WC powder particles is 200 nm, …
Formula For Sediment Transport Subject To Vertical Flows, Shu-Qing Yang
Formula For Sediment Transport Subject To Vertical Flows, Shu-Qing Yang
Faculty of Engineering and Information Sciences - Papers: Part B
Sediment transport is a geophysical phenomenon in which sediment particles are driven to move in streamwise and vertical directions by various forces. Almost all existing formulas of sediment transport were derived without considering vertical flows V, resulting in a large discrepancy between measured and predicted transport rates, as has been reported in the literature. This paper investigates the effect of vertical motion on sediment transport. It was found that upward fluid velocity increases particles' mobility, and downward motion increases particles stability. Furthermore, the investigation showed that decelerating flows can promote upward flow and vice versa. New equations were developed to …
Mixed Convection Of Non-Newtonian Nanofluid In An H-Shaped Cavity With Cooler And Heater Cylinders Filled By A Porous Material: Two Phase Approach, Zhixiong Li, Pouya Barnoon, Davood Toghraie, Reza Balali Dehkordi, Masoud Afrand
Mixed Convection Of Non-Newtonian Nanofluid In An H-Shaped Cavity With Cooler And Heater Cylinders Filled By A Porous Material: Two Phase Approach, Zhixiong Li, Pouya Barnoon, Davood Toghraie, Reza Balali Dehkordi, Masoud Afrand
Faculty of Engineering and Information Sciences - Papers: Part B
In the present problem, two-phase mixed convection of a non-Newtonian nanofluid in a porous H-shaped cavity is studied. Inside the enclosure there are four rotating cylinders, using the Boussinesq approximation, mixed convection is created. Nanofluid includes H2O + 0.5% CMC and copper oxide nanoparticles. The mixture model was used to model physical phenomena. Different aspect ratios were used in order to achieve the best heat transfer rate. The Darcy and Richardson numbers ranges are 10−4 ≤ Da ≤ 10−2 and 1 ≤ Ri ≤ 100 respectively. Also, the aspect ratio and dimensionless angular velocities of cylinders ranges are 1.4 ≤ …