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A highly sensitive colorimetric and ratiometric sensor for fluoride ion

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Chinese Chemical Letters 2008年第11期19卷 1353-1357页

作者： ZhaoWu Xu Jin Tang He Tian Key labs for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology Shanghai 200237 PR China

A new benzoimidazole-naphthalimide derivative 4 was synthesized and its photophysical properties were studied. This compound showed highly selectively and sensitive colorimetric and ratiometric sensing ability for flu... 详细信息

关键词： Naphthalimide Benzoimidazole Fluoride sensor

Extraction equilibria and kinetics of Ti(Ⅳ)from leached chloride liquors of ilmenite

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Rare Metals 2017年第8期36卷 676-684页

作者： Abd ElAziz A.Nayl Hisham F.Aly Chemistry Department College of ScienceAl Jouf UniversitySkaka 2014Saudi Arabia Hot labs Centre Atomic Energy AuthorityCairo 13759Egypt

Extraction of titanium（Ⅳ）from real chloride leach liquor of ilmenite was carried out with 0.1 mol L^（-1）di-（2-ethylhexyl）phosphoric acid（HDEHP）in *** and kinetics studies for Ti（Ⅳ）were carried out in the presence of impurities that were leached with Ti（Ⅳ）.Parameters affecting extraction rate of Ti（Ⅳ）from chloride media in the presence of Fe（Ⅲ）,Mg（Ⅱ）,and Al（Ⅲ）were studied to evaluate the stoichiometry of extracted Ti（Ⅳ）*** is found that the extraction rate of Ti（Ⅳ）is dependent on the extractant concentration and pH of *** the optimum conditions,more than 95%Ti（Ⅳ）can be *** the basis of slope analysis method,the extracted species of Ti（Ⅳ）appears to be[TiO（H_2A_2）_2]_（org）,where H_2A_2 refers to ***,the kinetic studies of the extraction process of Ti（Ⅳ）and other metal ion impurities were carried out by a Lewis cell with a constant interfacial area of 16.7 cm^*** of the experimental results suggests that TiO^（2＋）extraction rate by HDEHP is the first with respect to hydrogen ion concentration and HDEHP *** results are interpreted by a reaction mechanism where the extraction process is controlled by a diffusion process at the interface rather than in the bulk phase.

关键词： Kinetics Equilibrium Titanium(Ⅳ) Ilmenite Hydrochloric acid Separation

Varifocal MEMS mirrors for high-speed axial focus scanning:a review

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Microsystems & Nanoengineering 2023年第5期9卷 57-71页

作者： Jaka Pribošek Markus Bainschab Takashi Sasaki Silicon Austria labs VillachAustria

Recent advances brought the performance of MEMS-based varifocal mirrors to levels comparable to conventional ultra-high-speed focusing *** mirrors are becoming capable of high axial resolution exceeding 300 resolvable planes,can achieve microsecond response times,continuous operation above several hundred kHz,and can be designed to combine focusing with lateral steering in a single-chip *** survey summarizes the past 50 years of scientific progress in varifocal MEMS mirrors,providing the most comprehensive study in this field to *** introduce a novel figure of merit for varifocal mirrors on the basis of which we evaluate and compare nearly all reported devices from the *** the forefront of this review is the analysis of the advantages and shortcomings of various actuation technologies,as well as a systematic study of methods reported to enhance the focusing performance in terms of speed,resolution,and shape *** believe this analysis will fuel the future technological development of next-generation varifocal mirrors reaching the axial resolution of 1000 resolvable planes.

关键词： axial mirrors exceeding

Buses retrofitting with diesel particle filters: Real-world fuel economy and roadworthiness test considerations

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Journal of Environmental Sciences 2018年第5期30卷 273-286页

作者： Rafael Fleischman Ran Amiel Jan Czerwinski ANDreas Mayer Leonid Tartakovsky Faculty of Mechanical Engineering Technion–Israel Institute of Technology labs for IC-Engines & Exhaust Emission Control(AFHB) Berne University of Applied Sciences VERT Association TTM

Retrofitting older vehicles with diesel particulate filter（DPF） is a cost-effective measure to quickly and efficiently reduce particulate matter emissions. This study experimentally analyzes real-world performance of buses retrofitted with CRT DPFs. 18 in-use Euro III technology urban and intercity buses were investigated for a period of 12 months. The influence of the DPF and of the vehicle natural aging on buses fuel economy are analyzed and discussed. While the effect of natural deterioration is about 1.2%–1.3%, DPF contribution to fuel economy penalty is found to be 0.6% to 1.8%, depending on the bus type. DPF filtration efficiency is analyzed throughout the study and found to be in average 96% in the size range of 23–560 nm. Four different load and non-load engine operating modes are investigated on their appropriateness for roadworthiness tests. High idle is found to be the most suitable regime for PN diagnostics considering particle number filtration efficiency.

关键词： Diesel particle filter Ultrafine particles Diesel bus Fuel economy Vehicle natural aging Roadworthiness tests

Morphology,composition,and sources of individual aerosol particles at a regional background site of the YRD,China

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Journal of Environmental Sciences 2019年第3期31卷 354-362页

作者： Liang Xu A.P.Lingaswamy Yinxiao Zhang Lei Liu Yuanyuan Wang Jian Zhang Qianli Ma Weijun Li Environment Research Institute Shandong University Santhiram Engineering College Lin'an Air Background Station (labs) Department of Atmospheric Sciences School of Earth Sciences Zhejiang University

Aerosol samples were collected at Lin'an, a background site of Yangtze River Delta(YRD).Morphology, size, composition, and mixing state of individual aerosol particles were characterized by transmission electron microscopy(TEM) coupled with energy dispersive X-ray spectroscopy(EDS), and the soluble ions of PM_(1.0) were studied by aerosol mass spectrometer(AMS). The daily average AMS mass concentrations of sulfate, nitrate, and ammonium were about 5.8, 8.6, and 5.6 μg/m^3, respectively. Individual aerosol particles were classified into seven types: S-rich, K-rich, organic matter(OM), soot, fly ash, metal, and mineral. S-rich particles were dominant in all size bins, and 51%(by number) of S-rich particles were internally mixed with other particles. The fraction of organic coating particles was 13.7% in morning, 25.2% in afternoon, and 11% in evening, suggesting that the strong photochemical process during afternoon produced more secondary organic aerosols(SOA) on the surface of inorganic particles. Fly ash and metal particles were abundant during the day, suggesting the influence of emissions from coal-fired power plants and steel plants. The results indicate that the intense industrial emissions in the YRD significantly transported to the background areas. PM_(2.5) concentration may be lower in background air than in urban air but complex mixing state of aerosol particles indicates that the long-range transported particles substantially influenced the background air quality.

关键词： Regional background air Transmission electron microscopy Individual aerosol particles Mixing state Yangtze River Delta

Lattice reduction aided belief propagation for massive MIMO detection

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Science China(Information Sciences) 2019年第4期62卷 127-139页

作者： Senjie ZHANG Zhiqiang HE Kai NIU Shi JIN Hong CHENG Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications National Mobile Communications Research Laboratory Southeast University Intel labs China

Efficient massive MIMO detection for practical deployment, which is with spatially correlated channel and high-order modulation, is a challenging topic for the fifth generation mobile communication(5G). In this paper, lattice reduction aided belief propagation(LRA-BP) is proposed for massive MIMO detection. LRA-BP applies the message updating rules of Markov random field based belief propagation(MRF-BP) in lattice reduced MIMO system. With the lattice reduced, well-conditioned MIMO channel,LRA-BP obtains better message updating and detection performance in spatially correlated channel than MRF-BP. Log-domain arithmetic is used in LRA-BP for computational complexity reduction. Simulation result shows that LRA-BP outperforms MRF-BP with 3–10 dB in terms of required SNR for 1% packet error rate in spatially correlated channel for 256-QAM. We also show that LRA-BP requires much lower complexity compared with MRF-BP.

关键词： massive MIMO MIMO detection belief propagation graph-based detection lattice reduction Markov random field

Edge detection using resistive threshold logic networks with CMOS flash memories

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International Journal of Intelligent Computing and Cybernetics 2014年第1期7卷 79-94页

作者： Alex Pappachen James Anusha Pachentavida Sherin Sugathan School of Engineering Nazarbayev UniversityAstanaKazakhstan Neuromorphic Engineering Group Enview R&D LabsTrivandrumIndia

Purpose–The purpose of this paper is to present a new approach to edge detection using semiconductor flash memory networks having scalable and parallel hardware ***/methodology/approach–A flash cell can store multiple states by controlling its voltage *** equivalent resistance of the operation states controlled by threshold voltage of flash cell gives out different combinations of logic 0 and 1 *** paper explores this basic feature of flash memory in designing a resistance change memory network for implementing novel edge detector *** approach of detecting the edges is inspired from the spatial change detection ability of the human visual ***–The proposed approach consumes less number of electronic components for its implementation,and outperforms the conventional approaches of edge detection with respect to the processing speed,scalability and ease of *** is also demonstrated to provide edges invariant to changes in the direction of the spatial change in the *** limitations/implications–This research brings about a new direction in the development of edge detection,in terms of developing high-speed parallel processing edge detection and imaging *** implications–The proposed approach reduces the implementation complexity by removing the need to have convolution operations for spatial edge ***/value–This paper presents one of the first edge detection approaches that is purely a hardware oriented design,uses resistance of flash memory to form edge detector cells,and one that does not use computational operations such as additions or multiplications for its implementation.

关键词： Image processing Cognitive systems Evolvable hardware

A Spectral-Mode-Splitting Scheme for CSRZ and CSRZ-DPSK Signal Transmission

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光学学报 2003年第S1期23卷 595-596页

作者： Akira Hirano Yutaka Miyamoto Shoichiro Kuwahara NTT Network Innovation labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPANNTT Network Innovation Labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPANNTT Network Innovation Labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPAN

We propose a spectral-mode-splitting scheme and how it can be applied to CSRZ and CSRZ-DPSK signal formats, and show that it provides both accurate chromatic dispersion detection in CSRZ application and robustness aga... 详细信息

关键词： CSRZ it DPSK NRZ for

Linking temporal records

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Frontiers of Computer Science 2012年第3期6卷 293-312页

作者： Pei LI Xin Luna DONG Andrea MAURINO Divesh SRIVASTAVA Department of Informatics Systems and Communication University of Milan-Bicocca Milan 20126 Italy Data Management Department AT&T Labs-Research Florham Park NJ 07932 USA

Many data sets contain temporal records which span a long period of time; each record is associated with a time stamp and describes some aspects of a real-world en- tity at a particular time （e.g., author information in DBLP）. In such cases, we often wish to identify records that describe the same entity over time and so be able to perform interest- ing longitudinal data analysis. However, existing record link- age techniques ignore temporal information and fall short for temporal data. This article studies linking temporal records. First, we ap- ply time decay to capture the effect of elapsed time on entity value evolution. Second, instead of comparing each pair of records locally, we propose clustering methods that consider the time order of the records and make global decisions. Ex- perimental results show that our algorithms significantly out- perform traditional linkage methods on various temporal data sets.

关键词： temporal data record linkage data integration