Real time implementation of SURF algorithm on FPGA platform

Too many traffic accidents are caused by drivers’ failure of noticing buildings, traffic sign and other objects. Video based scene or object detection which can easily enhance drivers’ judgment performance by automatically detecting scene and signs. Two of the recent popular video detection algorithms are Background Differentiation and Feature based object detection. The background Differentiation is an efficient and fast way of observing a moving object in a relatively stationary background, which makes it easy to be implemented on a mobile platform and performs a swift processing speed. The Feature based scene detection such like the Speeded Up Robust Feature (SURF), is an appropriate way of detecting specific scene with accuracy and rotation and illumination invariance. By comparison, SURF computational expense is much higher, which remains the algorithm limited in real time mobile platform. In this thesis, I present two real time tracking algorithms, Differentiation based and SURF based scene detection systems on FPGA platform. The proposed hardware designs are able to process video of 800*600 resolution at 60 frames per second, the video clock rate is 40 MHz

Production Across the Nordics

In the uncertain and volatile market that companies are currently facing worldwide, researchers and engineers\ua0become a key link to\ua0strengthen the industry and universities\ua0in order to\ua0understand, communicate, and tackle\ua0current challenges. In the PhD course, International Production, the goal is to investigate what makes Sweden and Iceland booming industrial hubs\ua0driven by technology. Through the\ua0visits to different types of industries, such as fintech, medical, or automotive industry,\ua0we as researchers have gained a better understanding of the challenges they are currently facing. This report is a summary of our findings and observations.\ua0\ua0The participants have focused on the\ua0six challenge areas highlighted within the Produktion2030 graduate school and summarize their findings as:\ua0\ua0•Resource-efficient production:\ua0Data as a resource is becoming increasingly important for the majority of companies in the Nordics and the application of traditional resource management tools on data is a suggested area for future research. \ua0•Flexible production:To strengthen organizations by\ua0enabling\ua0production systems to be flexible to address\ua0market variations is a key\ua0challenge to consider in the manufacturing industry•Virtual production development:Digitalization level is distinct in each Nodic country with the reason that each country has its own digitalization transformation policy and different measures on digitalization level.\ua0•Humans in the production system:Humans are central in the production systems of the visited companies. Use of automation technology and AI to support humans in their work may become more common in the future.•Circular production systems and maintenance:Circular production systems require a complex approach through the whole value chain. Industry in the Nordics has started the adoption of a circularity approach.\ua0•Integrated product and production development:\ua0Integration of product and production development is a key business factor for the Nordic countries, and geographical proximity between the two departments can have a beneficial effect. \ua0We hope that this report provides more\ua0details\ua0regarding\ua0the success and current challenges of the Swedish and Icelandic enterprises

Real-Time Redox Speciation of Iron in Estuarine and Coastal Surface Waters

An automated, shipboard-use system was developed for real-time speciation of iron in coastal surface waters. It comprised a towed Fish underway sampler and a modified reverse flow injection analysis system with a liquid waveguide capillary flow cell–spectrophotometric detection device. The detection was based on the reaction between ferrozine and Fe­(II). The detection limits of 0.3 and 0.7 nM were achieved for Fe­(II) and Fe­(II+III), together with their respective dynamic linear ranges of 0.5–250 and 0.9–250 nM. The system was successfully deployed and run consecutively for about 1 week during a cruise in August 2009 to the East China Sea off the Changjiang Estuary. The distribution of operationally defined field dissolvable Fe­(II) and Fe­(II+III) (expressed as Fe_a(II) and Fe_a(II+III)) in these areas was obtained, which showed that both Fe_a(II) and Fe_a(II+III) concentrations decreased with salinity when there were relatively high Fe_a(II) concentrations (up to about 120 nM) near shore. A distinct distribution of Fe_a(II) to Fe_a(II+III) ratios was also revealed, with a ratio of 0.58 in the water off Changjiang Estuary and 0.19 in the open ocean

Simultaneous determination of nanomolar nitrite and nitrate in seawater using reverse flow injection analysis coupled with a long path length liquid waveguide capillary cell

National Natural Science Foundation of China [41121091]A reverse flow injection analysis (rFIA) method coupled with 1 m liquid waveguide capillary cell and spectrophotometric detection for simultaneous determination of nanomolar nitrite and nitrate in seawater was developed. The design of two analytical channels sharing the same detection system in the proposed method allowed the analysis of both nitrite and nitrate with single sample injection. Different strategies of reagent injection were investigated to obtain a higher sensitivity and a better peak shape. A dual-wavelength detection mode was chosen to eliminate the light source shifting and sample matrix interference. Experimental parameters were optimized based on a univariate experimental design and the matrix effect from seawater was preliminarily investigated. The proposed method had high sensitivity with detection limit of 0.6 nmol L-1 for both nitrite and nitrate. The linearity was 2-500 nmol L-1 for both analytes, and the upper limit could be extended by choosing a lower sensitivity detection wavelength. The analytical results of 26 surface seawater samples obtained with the proposed method showed good agreement with those using a reference method operated using an automated segmented flow analyzer. The proposed method could greatly minimize the trouble introduced by bubbles in the segmented flow analyzer. It also had the advantages of high precision and high sample throughput (nitrite and nitrate detected in triplicate; 5 h(-1)). Compared to normal flow injection analysis, the rFIA method is superior due to its lower reagent consumption, less dispersion of sample, as well as higher sensitivity. (C) 2013 Elsevier B.V. All rights reserved

A sensitive flow-batch system for on board determination of ultra-trace ammonium in seawater: Method development and shipboard application

Science Fund for Creative Research Groups of the National Natural Science Foundation of China [41121091]; China National Basic Research Program ("973" Program) "Carbon cycling in China Seas-budget, controls and ocean acidification (CHOICE-C Project)" [2009CB421200]Combining fluorescence detection with flow analysis and solid phase extraction (SPE), a highly sensitive and automatic flow system for measurement of ultra-trace ammonium in open ocean water was established. Determination was based on fluorescence detection of a typical product of o-phthaldialdehyde and ammonium. In this study, the fluorescence reaction product could be efficiently extracted onto an SPE cartridge (HLB, hydrophilic-lipophilic balance). The extracted fluorescence compounds were rapidly eluted with ethanol and directed into a flow cell for fluorescence detection. Compared with the common used fluorescence method, the proposed one offered the benefits of improved sensitivity, reduced reagent consumption, negligible salinity effect and lower cost. Experimental parameters were optimized using a univariate experimental design. Calibration curves, ranging from 1.67 to 300 nM, were obtained with different reaction times. The recoveries were between 89.5 and 96.5%, and the detection limits in land-based and shipboard laboratories were 0.7 and 1.2 nM, respectively. The relative standard deviation was 3.5% (n = 5) for an aged seawater sample spiked with 20 nM ammonium. Compared with the analytical results obtained using the indophenol blue method coupled to a long-path liquid waveguide capillary cell, the proposed method showed good agreement. The method had been applied on board during a South China Sea cruise in August 2012. A vertical profile of ammonium in the South East Asia Time-Series (SEATS, 18 degrees N, 116 degrees E) station was produced. The distribution of ammonium in the surface seawater of the Qiongdong upwelling in South China Sea is also presented. (C) 2013 Elsevier B. V. All rights reserved

Racemates Have Much Higher Solid-State Fluorescence Efficiency than Their Levo- and Dextrorotary Enantiomers

C6-unsubstituted tetrahydropyrimidines (THPs) are compounds with a chiral carbon and strong aggregation-induced emission. The fluorescence properties of their racemates have been studied in detail, but those of their enantiomers have not. The solid-state fluorescence properties of the racemates and enantiomers of four chiral tetrahydropyrimidines (THPs <b>1</b>–<b>4</b>) have been investigated by the steady-state and time-resolved fluorescence, single-crystal X-ray structures, and HOMOs and LUMOs of their seven racemic (three of them are polymorphs), four <i>R</i>- and three <i>S</i>-enantiomeric crystals. It was found that the <i>R</i>- and <i>S</i>-enantiomers of <b>1</b>–<b>4</b> can self-assemble as <i>RS</i>-paired, <i>RS</i>-, or <i>RR</i>/<i>SS</i>-overlapped mode in their racemates and as the same <i>RR</i>/<i>SS</i>-overlapped mode in their <i>R</i>- and <i>S</i>-enantiomers. Unexpectedly, the solid-state fluorescence quantum yields (Φ_SF) of racemic <b>1</b>–<b>4</b> could increase to 93, 48, 80, and 100%, respectively, via a suitable heteroenantiomeric self-assembly, but the Φ_SF values of their seven enantiomers are only 25–46%, owing to much larger nonradiative rate constants than those of their racemates. This means that heteroenantiomeric self-assembly can be used as a new efficient method enhancing Φ_SF values. The advantage of racemates is first reported and expected to encourage the development and application of racemates as a new kind of fluorescent materials