检索结果-南通市图书馆

Improve the Accuracy of Fall Detection Based on Artificial Intelligence Algorithm

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第9期128卷 1103-1119页

作者： Ming-Chih chen Yin-Ting cheng ru-Wei chen Department of Electronic Engineering National Kaohsiung University of Science and Technology(First Campus)Kaohsiung City82445Taiwan

This work presents a fall detection system based on artificial *** system incorporates miniature wearable devices for fall *** detection is achieved by integrating a three-axis gyroscope and a threeaxis *** system gathers the differential data collected by the gyroscope and accelerometer,applies artificial intelligence algorithms for model training and constructs an effective model for fall *** provide easywearing and effective position detection,it is designed as a small device attached to the user’*** results have shown that the accuracy of the proposed fall detection model is up to 98%,demonstrating the effectiveness of the model in real-life fall detection.

关键词： Artificial intelligence fall detection miniature sensing device

6-(N,N-Dimethylamino)-2-naphthoylacryl Acid:a Highly Selective and Sensitive Fluorescent Sensor of Copper(Ⅱ)

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

Chemical Research in Chinese Universities 2012年第4期28卷 609-613页

作者： XIAO Xu-zhi chen Peng chen He-ru Guangdong Provincal Key Laboratory of Pharmacodynamic Constituents of Tranditional Chinese Medicine and New Drugs Research Institute of Traditional Chinese Medicine and Natural ProductsCollege of PharmacyJinan UniversityGuangzhou 510632P.R.China

A novel fluorescent probe,6-（N,N-dimethylamino）-2-naphthoylacryl acid（ACADAN） was designed and synthesized as a fluorescent sensor for Cu^2＋ in aqueous *** amplification of fluorescence signals without causing any discernible change of maximum fluorescence emission wavelength（λ max） was observed upon the addition of Cu^2＋.Importantly,ACADAN is capable of recognizing Cu^2＋ selectively in aqueous media in the presence of various biologically relevant metal ions and the prevalent toxic metal ions in the environment with high sensitivity（detection limit was 0.1 μmol/L）.

关键词： 6-(N N-Dimethylamino)-2-naphthoylacryl acid Copper(II) Fluorescent sensor Ion recognition Fluorescence enhancement

A nanostructured Ni/T-Nb_(2)O_(5)@carbon nanofibers as a long-life anode material for lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第2期40卷 374-382页

作者： Si-ru He Jian-Peng Zou Li-Bao chen Yue-Jiao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

In this work,nickel/T-Nb_(2)O_(5)nanoparticles encapsulated in mesoporous carbon nanofibers(denoted as Ni/T-Nb_(2)O_(5)@CNFs)are successfully prepared through a simple electrospinning route and succedent heating *** presence of Ni in carbon nanofibers is beneficial for enhancing the electronic conductivity and the initial Coulombic ***/T-Nb_(2)O_(5)nanoparticles are homogeneously incorporated in carbon nanofibers to form a nanocomposite system,which provides effective buffering during the lithiation/delithiation process for cycling *** Ni/TNb_(2)O_(5)@CNFs show high surface area(26.321 m^(2)·g^(-1))and mesoporous microstructure,resulting in higher capacity and excellent rate *** Ni/T-Nb_(2)O_(5)@CNFs exhibit a remarkable capacity of 437 mAh·g^(-1)at a current density of0.5 A·g^(-1)after 230 cycles and a capacity of 173 mAh·g^(-1)at a current density up to 10.0 A·g^(-1)after 1400 *** work indicates that nickel/T-Nb_(2)O_(5)nanoparticles encapsulated in carbon nanofibers can be a promising candidate for anode material in high-power LIBs.

关键词： Electrospinning Nickel T-Nb_(2)O_(5) Nanofiber anode Lithium-ion batteries

Asian monsoon shaped the pattern of woody dicotyledon richness in humid regions of China

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2020年第3期42卷 148-154页

作者： Wen-yun chen Tao Su Department of Economic Plants and Biotechnology Yunnan Key Laboratory for Wild Plant ResourcesKunming Institute of BotanyChinese Academy of SciencesKunming 650201China CAS Key Laboratory o f Tropical Forest Ecology Xishuangbanna Tropical Botanical CardenChinese Academy of SciencesMengla 666303China

Understanding how geographical patterns of plant richness are established is a key scientific question in ecology and *** factors,such as environmental energy,water availability,and rainfall seasonality,have been widely proposed to account for geographical patterns of plant richness at large *** a compiled distribution data set of 3166 native woody dicotyledons across 732 calibration grids at the county level in humid regions of China,we explored the geographical pattern of woody dicotyledon richness and its relationship to climatic variations,especially the Asian monsoonal *** found that species richness decreases with increasing *** study indicates that water availability(particularly mean annual precipitation,MAP)is the major abiotic factor in determining large-scale distribution patterns of species richness,Moreover,the seasonality of rainfall variables under the Asian monsoon climate largely contributes to species richness,because species richness correlates more significantly with precipitation during the three driest consecutive months(P3 DRY)than precipitation during the three wettest consecutive months(P3 WET).Therefore,we conclude that woody dicotyledon richness in humid regions of China is mainly affected by the Asian winter monsoon.

关键词： Species richness Precipitation Seasonal rainfall Temperature Biodiversity

Hydrothermal Synthesis and Characterization of Perovskite PbTiO_(3) Powders from Different Precursors

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1998年第3期14卷 3-7页

作者： chen Dai-rong XU ru-ren Department of Chemistry Jilin UniversityChangchun130023

Perovskite type of PbTiO 3 fine powders which are homogeneous in physic chemical properties has been hydrothermally synthesized from the different precursors. The borderline reaction conditions, such as temperature and time, for the formation of PbTiO 3 were established and the effect of the precursor on the particle properties was investigated. As a precursor, Pb Ti alko carbonate xerogel dispersed in 2 methoxyethanol was found to be effective for the synthesis of the PbTiO 3 powders with a lower agglomeration and a simple mode of particle size.

关键词： Hydrothermal synthesis PbTiO 3 powders Precursor

Integrated Control of Lateral and Vertical Vehicle Dynamics Based on Multi-agent System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2014年第2期27卷 304-318页

作者： HUANG chen chen Long yun Chaochun JIANG Haobin chen Yuexia School of Automobile and Traffic Engineering Jiangsu University

The existing research of the integrated chassis control mainly focuses on the different evaluation indexes and control strategy. Among the different evaluation indexes, the comprehensive properties are usually not considered based on the non-linear superposition principle. But, the control strategy has some shortages on tyre model with side-slip angle, road adhesion coefficient, vertical load and velocity. In this paper, based on belief, desire and intention（BDI）-agent model framework, the TYRE agent, electric power steering（EPS） agent and active suspension system（ASS） agent are proposed. In the system（SYS） agent, the coordination mechanism is employed to manage interdependences and conflicts among other agents, so as to improve the flexibility, adaptability, and robustness of the global control system. Due to the existence of the simulation demand of dynamic performance, the vehicle multi-body dynamics model is established by SIMPACK. And then the co-simulation analysis is conducted to evaluate the proposed multi-agent system（MAS） controller. The simulation results demonstrate that the MAS has good effect on the performance of EPS and ASS. Meantime, the better road feeling for the driver is provided considering the multiple and complex driving traffic. Finally, the MAS rapid control prototyping is built to conduct the real vehicle test. The test results are consistent to the simulation results, which verifies the correctness of simulation. The proposed research ensures the driving safety, enhances the handling stability, and improves the ride comfort.

关键词： tire steer suspension multi-agent vehicle dynamics

Experimental optimization and mathematical modeling of supercritical carbon dioxide extraction of essential oil from Pogostemon cablin

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第10期27卷 2407-2417页

作者： Kangning Xiong yun chen Shuai Shen Department of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

The supercritical carbon dioxide extraction was applied to obtain essential oil from Pogostemon cablin in this *** of extraction parameters including temperature,pressure,extraction time and particle size on extraction yield was investigated,and the response surface methodology with a Box–Behnken Design was used to achieve the optimized extraction *** maximum yield of essential oil was 2.4356%under the conditions of extraction temperature 47°C,pressure 24.5 MPa and extraction time 119 ***,based on the Brunauer–Emmett–Teller theory of adsorption,a mathematical modeling was performed to correlate the measured *** model shows a function relationship between extraction yield and time by a simple equation with three significantly adjustable *** model parameters have been optimized through simulated annealing *** predicted data from the mathematical model show a good agreement with the experimental data of the different extraction parameters.

关键词： Supercritical carbon dioxide extraction Pogostemon cablin Response surface methodology Mathematical modeling Simulated annealing algorithm

Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing Li Xiaoge Wang Xiaofan Cao Zhiqun He Chunjun Liang Mingxing chen Jing Ju Fangtian You Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： Post-growth mechanism Heterogeneous structure Single-particle spectroscopy Laser irradiation

Continuous production of biodiesel from cottonseed oil and methanol using a column reactor packed with calcined sodium silicate base catalyst

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第4期24卷 499-505页

作者： Xia Gui Sichen chen Zhi yun College of Chemistry and Chemical Engineering Nanjing Tech University

Sodium silicate and that calcined at 400℃ for 2 h were used to catalyze the transesterification of cottonseed oil with methanol. Calcined sodium silicate （CSS） catalyst exhibited much higher catalytic activity and stability. A maximum biodiesel yield of 98.9~ was achieved at methanol/oil mole ratio of 12：1, reaction temperature 65℃, reaction time 3.0 h, and CSS/oil mass ratio of 2 Wffo. After 7 consecutive reactions without any treatment, biodiesel yield reduced to 82.5%. Considering technological and economic feasibility, CSS base catalyst supported on 0 rings was prepared for continuous transesterification. The maximum yield was 99.1% under optimum conditions （reaction temperature 55 ~C, methanol velocity 1 ml. rain- 1, oil velocity 3 ml- rain- 1, and 5 tower sec- tions）. These results indicate that this new continuous biodiesel production process and apparatus present a great potential for industrial application in biodiesel.

关键词： TransesterificationCottonseed oilCalcined sodium silicateBiodieselSodium silicateContinuous production