检索结果-南通市图书馆

ARM3D:Attention-based relation module for indoor 3D object detection

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

Computational Visual Media 2022年第3期8卷 395-414页

作者： yuqing lan Yao Duan Chenyi Liu Chenyang Zhu Yueshan Xiong Hui Huang Kai xu College of Computer National University of Defense TechnologyChangsha 410073China Shenzhen University Shenzhen 518061China

Relation contexts have been proved to be useful for many challenging vision *** the field of3D object detection,previous methods have been taking the advantage of context encoding,graph embedding,or explicit relation reasoning to extract relation ***,there exist inevitably redundant relation contexts due to noisy or low-quality *** fact,invalid relation contexts usually indicate underlying scene misunderstanding and ambiguity,which may,on the contrary,reduce the performance in complex *** by recent attention mechanism like Transformer,we propose a novel 3D attention-based relation module(ARM3D).It encompasses objectaware relation reasoning to extract pair-wise relation contexts among qualified proposals and an attention module to distribute attention weights towards different relation *** this way,ARM3D can take full advantage of the useful relation contexts and filter those less relevant or even confusing contexts,which mitigates the ambiguity in *** have evaluated the effectiveness of ARM3D by plugging it into several state-of-the-art 3D object detectors and showing more accurate and robust detection *** experiments show the capability and generalization of ARM3D on 3D object *** source code is available at https://***/lanlan96/ARM3D.

关键词： attention mechanism scene understanding relational reasoning 3D indoor object detection

Regenerative Braking Strategy for Motor Hoist by Ultracapacitor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第2期25卷 377-384页

作者： BIAN Yongming ZHU Lijing lan hao LI Anhu xu Xinming School of Mechanical Engineering Tongji UniversityShanghai 201804China

Rising concern in environmental issues on global scale has made energy saving in powered equipment a very important *** order to improve the energy efficiency and driving range of a motor hoist,a regenerative braking system is designed and *** system takes a unique ultracapacitor-only approach to energy storage *** bi-directional bride DC？DC converter which regulates current flow to and from the ultracapacitor operates in two modes：boost and buck,depending on the direction of the *** order to provide constant input and output current at the ultracapacitor,this system uses a double proportional-integral（PI） control strategy in regulating the duty cycle of PWM to the DC？DC *** permanent magnet synchronous motor（PWSM） drive system is also *** space vector pulse width modulation（SVPWM） technique,along with a two-closed-loop vector control model,is adopted after detailed analysis of PMSM *** overall model and control strategy for this regenerative braking system is ultimately built and simulated under the MATLAB and Simulink environment.A test platform is built to obtain experimental *** of the results reveals that more than half of the gravitational potential energy can be recovered by this *** and experimentation results testify the validity of the double PI control strategy for interface circuit of ultracapacitor and SVPWM strategy for PMSM.

关键词： ultracapacitor regenerative braking strategy DC/DC converter permanent magnet synchronous motor space vector pulse width modulation

A cobalt oxide@polydopamine-reduced graphene oxide-based 3D photothermal evaporator for highly efficient solar steam generation

在线全文

学校读者我要写书评

暂无评论

Tungsten 2020年第4期2卷 423-432页

作者： Ting Gao xuan Wu Gary Owens hao‑lan xu Future Industries Institute University of South AustraliaAdelaideSA 5095Australia

Improving the evaporation rate and energy efficiency of solar steam generation is very important to facilitate real-world applications for clean water *** this work,Co_(3)O_(4)@polydopamine(PDA)nanoparticles were synthesized and combined with reduced graphene oxide(rGO)to fabricate a new Co_(3)O_(4)@PDA-rGO photothermal *** obtained pho-tothermal aerogel sheet was thereafter used to prepare both two-dimensional(2D)and three-dimensional(3D)photothermal evaporators for solar steam *** to the excellent light absorption and hydrophilicity of the photothermal aerogel,a high evaporation rate of 1.60 kg·m^(−2)·h^(−1) was achieved for the 2D photothermal *** for the 3D evaporator,the evaporation rate was dramatically increased to 3.71 kg·m^(−2)·h^(−1) with a corresponding light-to-vapor energy efficiency of 107%.This was attributed to an increased evaporation surface area,decreased energy loss from the top evaporation surface to the environment,and energy gain from the environment on the side evaporation *** 3D evaporator also showed excellent practical performance in seawater desalination thus demonstrating great potential for real-world applications.

关键词： Solar-steam generation Cobalt oxide Polydopamine Reduced graphene oxide Photothermal materials Seawater desalination

Leveraging the Empirical Wavelet Transform in Combination with Convolutional LSTM Neural Networks to Enhance the Accuracy of Polar Motion Prediction

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

Research in Astronomy and Astrophysics 2024年第9期24卷 214-224页

作者： xu-Qiao Wang lan Du Zhong-Kai Zhang Ze-Jun Liu hao Xiang College of Geospatial Information Information Engineering UniversityZhengzhou 450001China Henan Industrial Technology Academy of Spatio-Temporal Big Data Zhengzhou 450046China

High-precision polar motion prediction is of great significance for deep space exploration and satellite *** motion is affected by a variety of excitation factors,and nonlinear prediction methods are more suitable for polar motion *** order to explore the effect of deep learning in polar motion *** paper proposes a combined model based on empirical wavelet transform(EWT),Convolutional Neural Networks(CNN)and Long Short Term Memory(LSTM).By training and forecasting EOP 20C04 data,the effectiveness of the algorithm is verified,and the performance of two forecasting strategies in deep learning for polar motion prediction is *** results indicate that recursive multi-step prediction performs better than direct multi-step prediction for short-term forecasts within 15 days,while direct multi-step prediction is more suitable for medium and long-term *** the 365 days forecast,the mean absolute error of EWT-CNN-LSTM in the X direction and Y direction is 18.25 mas and 15.78 mas,respectively,which is 23.5% and 16.2% higher than the accuracy of Bulletin *** results show that the algorithm has a good effect in medium and long term polar motion prediction.

关键词： data analysis methods:miscellaneous astrometry reference systems Earth

Preparation and characterization of Fe_(2)O_(3)/Bi_(2)WO_(6)composite and photocatalytic degradation mechanism of microcystin-LR

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2021年第2期14卷 109-118页

作者： Li-xiao Ni Cun-hao Du Han-qi Wu Yan Li Xiang-lan Li Chu xu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China

The long-standing popularity of semiconductor photocatalysis,due to its great potential in a variety of applications,has resulted in the creation of numerous semiconductor photocatalysts,and it stimulated the development of various characterization *** this study,Fe_(2)O_(3)/Bi_(2)WO_(6)composite with a flower-like microsphere and hierarchical structure was synthesized with the facile hydrothermal-impregnation method without any surfactants.X-ray diffraction(XRD),scanning electron microscopy(SEM),ultravioletevisible(UV-Vis)diffuse reflectance spectroscopy,and photoluminescence spectroscopy were used to characterize the structures of the *** specific surface area was estimated with the Brunauer-Emmett-Teller(BET)method,and pore size distribution was determined using the Barrett-Joyner-Halenda(BJH)*** synthesized Fe_(2)O_(3)/Bi_(2)WO_(6)composite had an average diameter of approximately 4 nm,with smaller specific surface area and larger pore diameter than those of pristine Bi_(2)WO_(6).The results of XRD and SEM analyses confirmed that the composite was composed of Fe_(2)O_(3)and Bi_(2)WO_(6).The absorption edge of Bi_(2)WO_(6)was at a wavelength of 460 *** contrast,the absorption edge of Fe_(2)O_(3)/Bi_(2)WO_(6)to visible light was redshifted to 520 nm,with narrower bandgap width and stronger visible light *** was also found that the main active substances in the degradation of microcystin-LR(MC-LR)were hydroxyl radicals(·OH)and electron holes(h^(+)).Consequently,the results further showed that the heterojunction between Fe_(2)O_(3)and Bi_(2)WO_(6)can improve the charge transfer rate and effectively separate the photoinduced electrons and *** with Bi_(2)WO_(6),Fe_(2)O_(3)/Bi_(2)WO_(6)had no significant difference in the adsorption capacity of MC-LR and had more efficient photocatalytic degradation activity of *** degradation rates of MC-LR by Fe_(2)O_(3)/Bi_(2)WO_(6)and Bi_(2)WO_(6)reached 80%and 56%,*** d

关键词： Photocatalysis Composite photocatalyst Fe_(2)O_(3)/Bi_(2)WO_(6) Bi_(2)WO_(6) MC-LR

Thermal conductive proppant with self-suspension ability

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第3期20卷 1742-1749页

作者： Guo-Qing xu Xiu-Ping lan Si-Si hao Kai-Yi Hu Si-Meng Qi Li-Dong Geng Quan xu Yang Zhou Sinopec Key Laboratory of Drilling Completion and Fracturing of Shale Oil and Gas SINOPEC Research Institute of Petroleum Engineering Co.LtdBejing102249China State Key Laboratory of Petroleum Resources and Prospecting Bejing Key Laboratoryof Biogas Upgrading UtilizationHarvard SEAS-CUPB Joint Laboratory on Petroleum ScienceChina University of Petroleum(Beijing)Beijing102249China

The in situ mining technology is applied to the exploitation of medium-and low-maturity shale oil,which can use heaters to warm up the oil shale formations and pyrolyze the *** to the low thermal conductivity of oil shale,electric heaters need extra equipment to improve heat transfer *** this study,a thermally conductive proppant is fabricated by coating epoxy-resin and graphite on ceramic proppants for the first time,which could support the fracturing crack and transfer *** thermal conduction property of epoxy-resin and graphite coated proppants(EGPs)is 245%higher than that of uncoated proppants,which can transfer more heat to the oil shale formation and accelerate the conversion of *** adhesive property of EGPs is improved by 47.9%under the load force of 1500 nN,which prolongs the time for the fracture to *** summary,this novel proppant is expected to assist in-situ mining technology in the production of medium and low-maturity shale oil.

关键词： Exploitation of shaleoil In situ mining Technology Thermally conductive proppant Heat transfer

Corrosion behavior of as-cast Al_(0.75)CoFeCr_(1.25)Ni high entropy alloy in 0.5 mol/L NaOH solution

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第11期31卷 2852-2863页

作者： Si-jia Nie xue-ning Yi Hui-ling Zhou hao-jie Zhu lan-lan Yang Fang-lian Fu Jing-yong Li hao-kun Yang Guo-xiang xu Sheng Lu Yan-xin Qiao School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai264005ShandongChina Guangxi Liugong Machinery Co. Ltd.Liuzhou545007GuangxiChina Smart Manufacturing Division(SMD) Hong Kong Productivity CouncilHong Kong999077China

The corrosion behavior of an Al_(0.75)CoFeCr_(1.25)Ni high-entropy alloy (HEA) in 0.5 mol/L NaOH solution was investigated using a series of electrochemical and analytical techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, potentiodynamic polarization measurement and electrochemical impedance spectroscopy. The results showed that the Al_(0.75)CoFeCr_(1.25)Ni HEA exhibited a typical columnar dendritic structure, which is composed of face-centered cubic, body-centered cubic (BCC), and ordered BCC phases (B2 phase). The corrosion resistance of this HEA in 0.5 mol/L NaOH solution is comparable to that of 304 SS, attributed to the change in the composition of the passive film formed on the surface. Although the passive film formed was generally rich in Al, the proportion of Cr_(2)O_(3) inside it increased with the increasing immersion time, enhancing the stability of the passive film and thus improving the corrosion performance of this HEA in 0.5 mol/L NaOH solution.

关键词： High entropy alloy Corrosion Electrochemical behavior X-ray photoelectron spectroscopy Passive film

Low temperature solid-state synthesis and characterization of uniform YF_3 submicroparticles

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

Rare Metals 2014年第5期33卷 604-607页

作者： hao Fang Hua-lan xu Lin-Jie Bai Dong-Dong Guo Sheng-Liang Zhong Yun-Hai Lv College of Chemistry and Chemical Engineering Jiangxi Normal University Institute of Physics and Communication Engineering Jiangxi Normal University

In this paper, submicro-scaled YF3 particles with uniform rice-like morphologies were facilely synthesized by reacting yttrium nitrate with tetrabutylammonium fluoride via a solid-state reaction process at 50 °C for 12 *** phase confirmation and morphology of the as-prepared YF3 particles were investigated by X-ray powder diffraction（XRD） and scanning electron microscopy（SEM）.SEM results reveal that the YF3 submicroparticles are about 700 nm in length and 260 nm in width. Eu^3＋ and Tb^3＋ doped YF3 submicroparticles were also prepared with similar process and their photoluminescence properties were studied. Results demonstrate that the doping of Eu^3＋ and Tb^3＋ has slight effect on the morphologies of the product. Owing to the small average crystallite size or the low crystallinity of the product, the photoluminescence intensity of the Eu^3＋ and Tb^3＋ doped YF3 submicroparticles is very weak. Some characteristic peaks even cannot be observed in the emission spectrum.

关键词： Yttrium fluoride submicroparticles Solid-state reaction Low temperature Photoluminescence

Identification of Andrographis Herba and its common products using mini-barcode

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2022年第5期20卷 393-400页

作者： XIONG Chao HUANG Chen-hao WU lan xu Ran xuE Jian-Ping LIU Zhi-Guo SUN Wei School of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430023China Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China College of Life Sciences Huaibei Normal UniversityHuaibei 235000China

Andrographis Herba,the aerial part of Andrographis paniculata(Burm.f.)*** Nees(Acanthaceae),has a wide geographic distribution and has been used for the treatment of fever,cold,inflammation,and other infectious *** markets,sellers and buyers commonly inadvertently confuse with related *** addition,most Chinese medicinal herbs are subjected to traditional processing procedures,such as steaming and boiling,before they are sold at dispensaries;therefore,it is very difficult to identify Andrographis Herba when it is processed into Chinese *** identification of species and processed medicinal materials is a growing issue in the ***,conventional methods of identification have limitations,while DNA barcoding has received considerable attention as a new potential means to identify species and processed medicinal *** this study,17 standard reference materials of ***,2 standard decoctions,27 commercial products and two adulterants were *** on the ITS2 sequence,it could successfully identify *** and ***,a nucleotide signature consisting of 71 bp was designed,this sequence is highly conserved and specific within *** while divergent among other ***,we used these new primers to amplify the nucleotide signature region from processed *** conclusion,the DNA barcoding method developed in the present study for authenticating *** is rapid and *** can be used in the future to guarantee the quality of Andrographis Herba of each regulatory link for clinical use.

关键词： DNA barcoding Andrographis Herba Andrographis paniculata Molecular identification