检索结果-南通市图书馆

Particle Size and Shape of On-road Suspended Coarse Dust in the Shijiazhuang City, China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering 2011年第1期5卷 21-27页

作者： z.H. Wang z.P. hao College of Resource and Environment Sciences Hebei Normal University Shijiazhuang 050016 China

The particle size and shape measured by image analysis is helpful to discuss the human health effects of particulate beside the aerodynamic scale. To explore the size and shape features of particle suspended in the road environment, this research selected 12 bus stations as the sampling sites along the main road in the air polluted city Shijiazhuang, China, where a Car-Free Campaign had been carried out. We hung 2 slides covered with a layer of petroleum jelly to collect suspending particles for 24 hours at each sampling site, and measured the particles size and shape parameters with the Particle Size Analyzer of CIS-50. The results show that the average particle size by the equivalent area diameter is around 10 μm, the size distributions are multi-modal with wide span, demonstrating that coarse dust suspended on road derived from several particle sources. Most of the particles suspended are square or square-like in shape with rugged border. Compared the samples of ordinary days and of the Car-Free day, the size and shape features vary little, inferring the ineffective results for the particle control of the Campaign. There is certain relationship between particle size and shape. The number percent of PMs-E （particulate matter with equivalent area diameter beneath 5 pro） is positively correlative with the number percent of particles of square or square-like shape, and negatively correlative with that of round or round-like shape. This relationship pattern in the road environment is contrary to the situations in the upper atmosphere, inferring different transportation and source emission mechanism influences.

关键词： Particle size shape equivalent area diameter correlation

Wi-Fi based non-invasive detection of indoor wandering using LSTM model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2021年第6期15卷 109-119页

作者： Qiang LIN Yusheng hao Caihong LIU School of mathematics and computer science Northwest Minzu UniversityLanzhou 730030China Key Laboratory of Streaming Data Computing and Application Northwest Minzu UniversityLanzhou 730124China

Wandering is a significant indicator in the clinical diagnosis of dementia and other related diseases for *** monitoring of long-term continuous movement in indoor setting for detection of wandering movement is challenging because most elders are prone to forget to carry or wear sensors that collect motion information daily due to their declining ***-Fi as an emerging sensing modality has been widely used to monitor human indoor movement in a noninvasive *** order to continuously monitor individuals’indoor motion and reliably identify wandering movement in a non-invasive manner,in this work,we develop a LSTMbased deep classification method that is able to differentiate the wandering-causedWi-Fi signal change from the ***,we first use the off-the-shelf Wi-Fi devices to capture a resident’s indoor motion information,enabling to collect a group ofWi-Fi signal streams,which will be split into variablesize ***,the deep network LSTM is adopted to develop wandering detection method that is able to classify every variable-size segment of Wi-Fi signals into categories according to the well-known wandering spatiotemporal ***,experimental evaluation conducted on a group of realworld Wi-Fi signal streams shows that our proposed LSTMbased detection method is workable and effective to identify indoor wandering behavior,obtaining an average value of 0.9286,0.9618,0.9634 and 0.9619 for accuracy,precision,recall and F-1 score,respectively.

关键词： wandering detection assisting living Wi-Fi signal deep learning LSTM

Challenges and perspectives of air pollution control in China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第6期18卷 9-16页

作者： Bin zhao Shuxiao Wang Jiming hao State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

Air pollution is one of the most challenging environmental issues in the *** has achieved remarkable success in improving air quality in last decade as a result of aggressive air pollution control ***,the average fine particulate matter(PM2.5)concentration in China is still about six times of the World Health Organization(WHO)global Air Quality guidelines(AQg)and causing significant human health *** emission reductions of multiple air pollutants are required for China to achieve the *** we identify the major challenges in future air quality improvement and propose corresponding control *** main challenges include the persistently high health risk attributed to PM2.5 pollution,the excessively loose air quality standards,and coordinated control of air pollution,greenhouse gases(gHgs)emissions and emerging *** further improve air quality and protect human health,a health-oriented air pollution control strategy shall be implemented by tightening the air quality standards as well as optimizing emission reduction pathways based on the health risks of various *** the meantime,an“oneatmosphere”concept shall be adopted to strengthen the synergistic control of air pollutants and gHgs and the control of non-combustion sources and emerging pollutants shall be enhanced.

关键词： Air pollution China Health impact Air quality standards gHgs Emerging pollutants

Outsourcing or Not? The OEMrs Better Collecting Mode under Cap-and-Trade Regulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2021年第2期30卷 151-177页

作者： Lei Yang Caixia hao Yijuan Hu Department of Electronic Business South China University of TechnologyGuangzhou 510006China guangzhou Automobile group Motor CO. LTDGuangzhou 511434China

Many original equipment manufacturers(OEMs)carry out collecting operations by themselves or a third *** of the existing research papers in the literature consider the collecting mode selection problem from an economic ***,in practice,the firm's collecting decisions can be affected by the carbon policies at *** paper aims to bridge the gap in research on remanufacturing supply chain by taking the effects of cap-and-trade regulation into *** models are established to study the quantity and price decisions under different collecting *** find that the OEM reaps more profits in the OEM collecting mode than the third-party collecting mode when collection cost is ***,the third party has lower collection cost,and the third-party collecting mode may make the OEM more *** an environmental perspective,with high collection cost,the third party collecting mode can reduce the carbon emissions unless the cost of new products and the emissions intensity are *** addition,when the collection cost is low but the quantity of remanufacturing products is restricted by that of new products,the third party collecting mode may increase the carbon *** addition,the implementation of cap-and-trade regulation can always reduce carbon emissions,and it may increase the OEM's profits if consumers preference for remanufactured products is small.

关键词： Remanufacturing collection decision carbon emissions cap-and-trade regulation

Biomimetic nanomedicine toward personalized disease theranostics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第8期14卷 2491-2511页

作者： Huisong hao Yu Chen Meiying Wu School of Pharmaceutical Sciences(Shenzhen) Sun Yat-sen UniversityShenzhen 518107China School of Life Sciences Shanghai UniversityShanghai 200444China

Despite nanoparticle-based drug delivery systems have aroused broad research interest in the biomedical fields,the rising challenges such as easy recognition by the immune system and low accumulation in diseased sites significantly hinder their further clinical *** wrapped in cell membrane have emerged as a distinctive strategy to overcome these limitations due to the superior marriage of natural cell membrane and artificial nanomaterials,which endow them with prominent advantages in disease diagnosis and treatment,such as targeted drug transport,prolonged drug half-life,and diminished immunogenicity and *** this review,we mainly highlight and discuss the evolving progresses and advantages of cell membrane-based biomimetic nanosystems in the detection and treatment of various diseases over the past five years,including oncology,bacterial infections,brain diseases,and inflammatory diseases,which would benefit researchers in better and comprehensively understanding the complicated microenvironment of diseases and developing personalized biomimetic nanomedicines for different *** current challenges and potential opportunities for the future clinical translation of cell membrane coating nanotechnology are also covered.

关键词： diseases theranostics personalized nanomedicine biomimetic

An Intelligent Ellipsoid Calibration Method Based on the grey Wolf Algorithm for Magnetic Compass

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2021年第2期18卷 453-461页

作者： Xusheng Lei Xiaoyu zhang Yankun hao School of the Instrumentation Science and Opto-Electronic Engineering Beihang UniversityBeijing 100191China

With the measurement of the Earth’s magnetic field,magnetic compass can provide high frequency heading ***,it suffers from local magnetic *** intelligent ellipsoid calibration method based on the grey wolf is proposed to generate optimal parameters for magnetic compass to generate high performance heading *** the analysis of the projection relationship among the navigation coordinate frame,the body frame and the local horizontal frame,the heading ellipsoid equation is ***,an improved grey wolf algorithm is proposed to find optimization solution in a large solution *** the improvement of the convergence factor and the evolutionary mechanism,the improved grey wolf algorithm can generate optimized solution for heading ellipsoid *** effectiveness of the proposed method has been verified by a series of vehicle and flight *** experimental results show that the proposed method can eliminate errors caused by sensor defects,hard-iron interference,and soft-iron interference *** heading error generated by the magnetic compass is less than 0.2162 degree in real flight tests.

关键词： magnetic compass ellipsoid parameters grey wolf algorithm error model

Environmental Adaptive Control of a Snake-like Robot With Variable Stiffness Actuators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 745-751页

作者： Dong zhang hao Yuan zhengcai Cao IEEE College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

This work investigates adaptive stiffness control and motion optimization of a snake-like robot with variable stiffness actuators. The robot can vary its stiffness by controlling magnetorheological fluid(MRF) around actuators. In order to improve the robot's physical stability in complex environments, this work proposes an adaptive stiffness control strategy. This strategy is also useful for the robot to avoid disturbing caused by emergency situations such as collisions. In addition, to obtain optimal stiffness and reduce energy consumption, both torques of actuators and stiffness of the MRF braker are considered and optimized by using an evolutionary optimization algorithm. Simulations and experiments are conducted to verify the proposed adaptive stiffness control and optimization methods for a variable stiffness snake-like robots.

关键词： Adaptive control snake-like robot variable stiffness

Supramolecular organizing centers(SMOCs) as signaling machines in innate immune activation

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2015年第11期58卷 1067-1072页

作者： QIAO Qi WU hao Department of Biological Chemistry and Molecular Pharmacology Harvard Medical School Program in Cellular and Molecular Medicine Boston Children's Hospital

Innate immunity offers the first line of defense against infections and other types of danger such as tumorigenesis. Its discovery provides tremendous therapeutic opportunities for numerous human diseases. Delving into the structural basis of signal transduction by innate immune receptors, our lab has recently helped to establish the new paradigm in which innate immune receptors transduce ligand-binding signals through formation of higher-order assemblies containing intracellular adapters, signaling enzymes and their substrates. These large signalosome assemblies may be visible under light microscopy as punctate structures in the μm scale, connecting to the underlying molecular structures in the nm scale. They drive proximity-induced enzyme activation, and provide a mechanism for signaling amplification by nucleated polymerization. These supramolecular signaling complexes also open new questions on their cellular organization and mode of regulation, pose challenges to our methodology, and afford valuable implications in drug discovery against these medically important pathways.

关键词： innate immunity caspase-recruitment domain pyrin domain supramolecular organizing centers filament

Adversarial image detection based on the maximum channel of saliency maps

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2022年第5期18卷 307-312页

作者： FU haoran WANg Chundong LIN hao hao Qingbo Key Laboratory of Computer Vision and System Tianjin Key Laboratory of Intelligence Computing and Novel Software TechnologyTianjin University of TechnologyTianjin 300384China

Studies have shown that deep neural networks(DNNs) are vulnerable to adversarial examples(AEs) that induce incorrect behaviors. To defend these AEs, various detection techniques have been developed. However, most of them only appear to be effective against specific AEs and cannot generalize well to different AEs. We propose a new detection method against AEs based on the maximum channel of saliency maps(MCSM). The proposed method can alter the structure of adversarial perturbations and preserve the statistical properties of images at the same time. We conduct a complete evaluation on AEs generated by 6 prominent adversarial attacks on the Image Net large scale visual recognition challenge(ILSVRC) 2012 validation sets. The experimental results show that our method performs well on detecting various AEs.

关键词： networks neural maps