检索结果-南通市图书馆

Neuromorphic sensory computing

在线全文

学校读者我要写书评

暂无评论

Science China(Information sciences) 2022年第4期65卷 114-127页

作者： Tianqing WAN Sijie MA Fuyou LIAO Lingwei FAN Yang CHAI Department of Applied Physics The Hong Kong Polytechnic University The hong kong polytechnic university Shenzhen Research Institute

The number of sensory nodes in the Internet of everything continues to increase rapidly and generate massive data. The generated information from sensory nodes is much larger than the total collective human sensory throughput. It is quite challenging to send all of the data produced at sensory terminals to the“Cloud” computation center, especially for those time-delay sensitive applications. This situation demands a dramatic increase in the computation near or inside sensory networks. Inspired by biological sensory systems with a high data compression ratio, neuromorphic sensory computing provides a way to efficiently acquire and process a large volume of data from complex environments. Researchers have been investigating emerging materials, devices, circuits, and computing architectures to implement an artificial sensory system with high energy efficiency, speed, and density. Here we summarize the important features of biological systems and their hardware implementations. Electrons and photons are two representative information carriers, in which electron carrier allows high integration density for complex computing and photon carrier has high connectivity, high speed, wide bandwidth, and low power consumption. We overview the electronic and optical neuromorphic sensory computing and hybrid opto-electronic sensory computing, and present advances on multimodal sensory computing and their potential challenges.

关键词： neuromorphic sensory computing multimodal sensory computing electronic sensory computing optical sensory computing

Effect of chemical composition of PM_(2.5) on visibility in Guangzhou,China,2007 spring

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Particuology 2009年第1期7卷 68-75页

作者： Jun Tao Kin-Fai Ho Laiguo Chen Lihua Zhu Jinglei Han Zhencheng Xu South China Institute of Environmental sciences SEPA Guangzhou 510655 China The hong kong polytechnic university Hong Kong China

The object of this study was to investigate the correlation of visibility with chemical composition of PM2.5 in Guangzhou. In April 2007, 28 PM2.5 samples were collected daily at the monitoring station of the South China Institute of Environmental sciences （SCIES）, in urban Guangzhou. Water-soluble ionic species （CI^-, NO3^-, SO4^2-, NH4^＋, K^＋, Na^＋, Ca^2＋, and Mg^2＋） and carbonaceous contents （OC and EC） of the PM2.5 samples were determined to characterize their impact on visibility impairment. The results showed that sulfate was the dominant species that affected both light scattering and visibility. The average percentage contributions of the visibility-degrading species to light scattering coefficient were 40% for sulfate, 16% for nitrate, 22% for organics, and 22% for elemental carbon. Because of its foremost effect on visibility, sulfate reduction in PM2.5 would effectively improve the visibility of Guangzhou.

关键词： Visibility PM2.5 Carbonaceous aerosols Water-soluble ions

Effect of transcutaneous electrical nerve stimulation at acupoints on patients with type 2 diabetes mellitus:a randomized controlled trial

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2015年第2期35卷 134-140页

作者： Wu Zhiyuan Yang Ming Jia Jie Wu Yi Huang Tiansheng Li Mingfen He Zhijie Guo Zhenzhen Leung Mason Chin Pang Department of rehabilitation Huashan Hospital Affiliated to Fudan University Department of Gastroenterology Shanghai Jiading Traditional Chinese Medicine Hospital Department of rehabilitation sciences The Hong Kong Polytechnic University

OBJECTIVE:To examine whether transcutaneous electric nerve stimulation at acupoints(Acu-TENS)improved the biochemical and physical indices of patients with type 2 diabetes mellitus(T2DM).METHODS:Ninety subjects with T2DM were divided randomly into a control group(n = 30),aerobic exercise group(n- 30),or Acu-TENS group(n = 30).In addition to conventional diabetes drug treatment,patients in the Acu-TENS group received acupoint stimulation,the aerobic exercise group engaged in walking exercises,and the control group was given sham electrical *** groups were treated for 30 min for each session and five times a week for 2 *** indices of glycosylated hemoglobin,2 h postprandial glucose,fasting serum insulin,triglyceride,total cholesterol,and body mass index were assessed at pre-treatment,post-treatment,and follow-up,which was 2 months after ***:The indices of the control group were not changed(P > 0.05) at the three time *** the pre-treatment measurement,there were significant differences(P > 0.05) in indices among the three *** post-treatment,each index of the two groups was lower than that of the control group(P < 0.05),and improved in comparison with the pre-treatment measurement(P < 0.05).In follow-up,each index of the aerobic exercise group and Acu-TENS group increased,but was still decreased compared with the pre-treatment value(P < 0.05),excluding body mass ***:Acu-TENS could improve the state of patients with T2 DM and be used as a therapy in clinical application.

关键词： Diabetes mellitus type 2 Transcutaneous electric nerve stimulation Acupuncture points Exercise

Vacuum-free fabrication of high-performance semitransparent perovskite solar cells via e-glue assisted lamination process

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第7期62卷 875-882页

作者： Hengkai Zhang Yaokang Zhang Guang Yang Zhiwei Ren Wei Yu Dong Shen Chun-Shing Lee Zijian Zheng Gang Li The hong kong polytechnic university Shenzhen Research Institute Shenzhen 518057 China Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong China Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong China Center of Super-Diamond and Advanced Films Department of Chemistry City University of Hong Kong Hong Kong China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalin 116023 China

From a base material of conductive polymer(poly-(3,4-ethylenedioxythiophene):poly(styrenesulfonate),PEDOT:PSS),a flexible and high-conductivity(as low as 45Ω/sq)transparent electrode was fabricated on polydimethylsiloxane elastomer by an acid treatment and transfer *** with the D-sorbitol-doped PEDOT:PSS electric glue,we successfully demonstrated a vacuum-free and ambient lamination fabrication process for semi-transparent perovskite solar cells using triple cation Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)*** this manufacturing-friendly lamination process,we fabricated semitransparent perovskite solar cell devices with power conversion efficiencies up to 16.4%and variable transparencies.

关键词： perovskite solar cells lamination electric glue semi-transparent vacuum-free fabrication

Management of post-stroke depression(PSD)by electroencephalography for effective rehabilitation

在线全文

学校读者我要写书评

暂无评论

再生工程(英文) 2023年第1期4卷 44-54页

作者： Bibo Yang Yanhuan Huang Zengyong Li Xiaoling Hu Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHong KongChina Beijing Key Laboratory of rehabilitation Technical Aids for Old‐Age Disability National Research Centre for Rehabilitation Technical Aids BeijingBeijingChina university Research Facility in Behavioral and Systems Neuroscience(UBSN) The Hong Kong Polytechnic UniversityHong KongChina The hong kong polytechnic university Shenzhen Research Institute ShenzhenChina Research Institute for Smart Ageing(RISA) The Hong Kong Polytechnic UniversityHong KongChina

Post-stroke depression(PSD)has negative impacts on the daily life of stroke survivors and delays their neuro-logical ***,traditional post-stroke rehabilitation mainly focused on motor restoration,whereas little attention was given to the affective *** management of PSD,including diagnosis,intervention,and follow-ups,is essential for post-stroke *** an objective measurement of the nervous system,electroencephalography(EEG)has been applied to the diagnosis and evaluation of *** this paper,we re-viewed the literature most related to the clinical applications of EEG for PSD and offered a cross-section that is useful for selecting appropriate approaches in *** study aimed to gather EEG-based empirical ev-idence for PSD diagnosis,review interventions for managing PSD,and analyze the evaluation *** total,33 diagnostic studies and 19 intervention studies related to PSD and depression were selected from the *** was found that the EEG features analyzed by both band-based and nonlinear dynamic approaches were capable of quantifying the abnormal neural responses on the cortical level for PSD diagnosis and interven-tion evaluation/***,EEG-based machine learning has also been applied to the diagnosis and evaluation of depression to automate and speed up the process,and the results have been *** brain-computer interface(BCI)interventions have been widely applied to post-stroke motor rehabilitation and cognitive training,BCI emotional training has not been directly used in PSD *** review showed the need for understanding the cortical responses of PSD to improve its diagnosis and precision *** also revealed that future post-stroke rehabilitation plans should include training sessions for motor,affect,and cognitive functions and closely monitor their improvements.

关键词： Post-stroke depression Stroke rehabilitation Electroencephalography Machine learning Brain-computer interface

Fabrication and Characterization of Gecko-inspired Dry Adhesion, Superhydrophobicity and Wet Self-cleaning Surfaces

维普期刊数据库评论

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 2016年第1期13卷 132-142页

作者： Yongchao Zhang Shuxin Qu Xiang Cheng Xueling Gao Xia Guo Key Lab of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China The hong kong polytechnic university Department of Rehabilitation Sciences Kowloon Hong Kong 999077 China

In this study, gecko-inspired polydimethylsiloxane （PDMS） microfiber surfaces were fabricated by combining Inductively Coupled Plasma （ICP） and micro-mold casting. The effect of roughness and surface energy of counterface on the adhesion of gecko-inspired microflber surfaces and its superhydrophobicity and wet self-cleaning were studied. The adhesion of gecko-inspired microfiber surfaces depended on the roughness of the eounterfaces due to the influences of contact area and interlocking mechanism. SEM images of interfaces between counterfaces with different roughness and gecko-inspired mi- crofiber surfaces revealed the matched and dis-matched contact directly. The gecko-inspired microfiber surface got the larger adhesive force from the higher surface energy counterface, which is consisted with Johnson-Kendall-Roberts （JKR） theory. The smaller dimension and lower duty ratio of microfibers on PDMS resulted in the increasing of Water Contact Angle （WCA） and the decreasing of Sliding Angle （SA） compared to those of smooth PDMS. Particularly, sample P-8-28-20 had the biggest WCA （155°） and SA （7°）, which displayed the superhydrophobicity and the best wet self-cleaning efficiency in all samples. The present studies showed that the roughness and surface energy of counterface both affected the adhesion of gecko-inspired microfiber surfaces. The smaller dimension and lower duty ratio of microfibers on PDMS endowed it with the superhydro- phobicity and the wet self-cleaning abilities.

关键词： gecko-inspired microfiber polydimethylsiloxane surfaces surface properties counterface superhydrophobicity wet self-cleaning

The onset of surface-enhanced Raman scattering for single-particle detection of submicroplastics

维普期刊数据库评论

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 Environmental sciences 2022年第11期34卷 58-64页

作者： Cheng-Hao Lee James Kar-Hei Fang Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloonHong Kong SARChina Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityKowloonHong Kong SARChina Research Institute for Future Food The Hong Kong Polytechnic UniversityKowloonHong Kong SARChina State Key Laboratory of Marine Pollution City University of Hong KongKowloonHong Kong SARChina

Microplastics represent an emerging environmental problem worldwide, raising ecological and food safety concerns. Compared to microplastics, there is growing evidence of an even higher abundance of submicro-and nanoplastics in the environment, but a reliable monitoring method for detecting these smaller-sized plastics is lacking. Herein we presented the application of surface-enhanced Raman scattering(SERS) for this purpose. Particles of polystyrene(PS;600 nm) were used as the probe analyte. Gold nanourchins(Au NU;50 nm),i.e. urchin-shaped nanoparticles with irregular spikes around the core, were used as the SERS-active substrate. The effectiveness of SERS on PS was evaluated at a single-particle level with different numbers of Au NU in order to determine the minimum conditions required for the onset of the SERS effect. Our findings suggest that SERS of a single particle of PS can be induced by as few as 1–5 particles of Au NU, and that the use of excitation wavelength at 785 nm is appropriate to meet the red-shifted surface plasmon resonance of Au NU upon aggregation. These specifications provide additional information for the development of SERS-based tools for detecting plastic particles < 1 μm in food and environmental samples.

关键词： Microplastics Nanoplastics Gold nanourchins SERS Food contamination

Chemical characteristics of aerosols at coastal station in hong kong.Ⅱ. Environmental behavior of trace elements during the April 1995 to April 1996

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2004年第2期16卷 212-221页

作者： K.S.Lam Z.L.Cheng S.C.Kot C.W.Tsang Department of Civil and Structural Engineering the Hong Kong Polytechnic UniversityResearch Center for Eco-Environmental Sciences Chinese Academy of SciencesDepartment of Mechanical Engineering The Hong Kong University of Science & Technology Clear Water BayDepartment of Applied Biology and Chemical Technology the Hong Kong Polytechnic University Hung Hom Hong Kong ChinaBeijing 100085 ChinaHong Kong ChinaHung Hom Hong Kong China

An one-year of sampling aerosol program was carried out during the period of April 1995 to April 1996 at coastal region, Cape D′Aguilar, in hong kong. The trace element composition of aerosol particles(TSP and PM 10 ) were measured and analyzed by using the Instrumental Neutron Activation Analysis(INAA) and Inductive Couple Plasma-Mass Spectrometry(ICP-MS) techniques. The results showed that the polluted elements such as: V, Zn, As, Pb, Cd, Sb, I, Se, Bi, with high enrichment factor(E.F) values, are derived from anthropogenic sources, while Sc, Al, Fe, Mn, Sm, La, Sr are less than 10 in E.F, these elements are related the crust and soil. The concentration of the trace elements are present seasonal variation i.e. summer low and winter high, whereas the V or noncrustal V(V *) present summer high and winter low, this phenomenon might be explained by local or regional oil combustion sources. Use three type of elemental ratio, e.g. La/Sm, Mn */V * and Bi/Al indicate that both TSP and PM 10 of La/Sm ratios are mainly related to soil and dust, Mn */V * are probably represent fossil combustion and Bi/Al are possibly associated with refuse incineration, ferromanganese alloys and aluminum production. The varimax rotation factor analysis for trace elements was performed. By means of the absolute principal component analysis(APCA) and multiple regression, the contribution of trace elements to possible sources and overall means of trace elements were estimated. The results showed that the present station is impacted by the anthropogenic species, although the quantities are different during the summertime and wintertime.

关键词： TSP PM 10 trace elements enhancement factor element ratios seasonal variation factor analysis

On the Variability and Correlation of Surface Ozone and Carbon Monoxide Observed in hong kong Using Trajectory and Regression Analyses

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric sciences 2004年第1期21卷 141-152页

作者：王体健 K.S.LAM C.W.TSANG S.C.KOT Department of Atmospheric sciences Nanjing University Nanjing 210093 Environmental Engineering Unit Department of Civil & Structural Engineering The Hong Kong Polytechnic University Hong Kong Environmental Engineering Unit Department of Civil & Structural Engineering The Hong Kong Polytechnic University Hong Kong Department of Mechanical Engineering Hong Kong University of Science & Technology Hong Kong

This paper investigates, the variability and correlation of surface ozone (Os) and carbon monoxide (CO) observed at Cape D'Aguilar in hong kong from 1 January 1994 to 31 December 1995. Statistical analysis shows that the average O3 and CO mixing ratios during the two years are 32±17ppbv and 305±191 ppbv, respectively. The O3/CO ratio ranges from 0.05 to 0.6 ppbv/ppbv with its frequency peaking at 0.15. The raw dataset is divided into six groups using backward trajectory and cluster analyses. For data assigned to the same trajectory type, three groups are further sorted out based on CO and NOX mixing ratios. The correlation coefficients and slopes of O3/CO for the 18 groups are calculated using linear regression analysis. Finally, five kinds of air masses with different chemical features are identified: continental background (CB), marine background (MB), regional polluted continental (RPC), perturbed marine (P*M), and local polluted (LP) air masses. Further studies indicate that O3 and CO in the continental and marine background air masses (CB and MB) are positively correlated for the reason that they are well mixed over the long range transport before arriving at the site. The negative correlation between O3 and CO in air mass LP is believed to be associated with heavy anthropogenic influence, which results from the enhancement by local sources as indicated by high CO and NOx and depletion of O3 when mixed with fresh emissions. The positive correlation in the perturbed marine air mass P*M favors the low photochemical production of O3. The negative correlation found in the regional polluted continental air mass RPC is different from the observations at Oki Island in Japan due to the more complex O3 chemistry at Cape D'Aguilar.

关键词： ozone carbon monoxide trajectory