检索结果-南通市图书馆

IET Cyber-Systems and Robotics 2024年第3期6卷 31-48页

作者： Khanh nguyen Viet Minh Do Duc Thanh cao Duc Tung Lam nguyen School of Electrical and Electronic Engineering Hanoi University of Science and TechnologyHanoiVietnam Vietnam Maritime University HaiphongVietnam

The phenomenon of sloshing causes a significantly negative impact on a wide range of industries.A time‐optimal flatness‐based trajectory planning and Lyapunov‐based model predictive control(LMPC)is proposed for trajectory tracking of a transmitting cylindrical container filled with ***,this research presents an equivalent discrete model based on a mass‐spring‐damper ***,after the flatness of the adopted non‐linear model for 2D is established,time‐optimal trajectories are introduced.A control method called LMPC is shown to solve the problem of orbital tracking,which allows setting limits for state *** addition,to ensure system performance,a linear extended state observer(LESO)is integrated to cope with system ***,the efficiency of the proposed approach for liquid sloshing suppression and tracking is illustrated by simulations.

关键词： control dynamic model motion planning

A new species of Micryletta(Amphibia:Anura:Microhylidae)from the Langbian Plateau in southern Vietnam

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

Zoological Research 2021年第6期42卷 726-733页

作者： Nikolay A.Poyarkov Tan Van nguyen Jian-huan Yang Vladislav AGorin Faculty of Biology Department of Vertebrate ZoologyMoscow State UniversityMoscow119234Russia Laboratory of Tropical Ecology Joint Russian-Vietnamese Tropical Research and Technological CenterHanoiVietnam Department of Species Conservation Save Vietnam’s WildlifeNinh BinhVietnam Kadoorie Conservation China Kadoorie Farm and Botanic GardenTai PoHong Kong SARChina

We report a new species of the genus Micryletta from the montane evergreen forest in the Bidoup-Nui Ba National Park,Lam Dong Province,Langbian Plateau,southern Vietnam,based on molecular and morphological *** new species is diagnosed by a combination of the following morphological characters:body size small(snout-vent length(SVL)22.4 mm,single female);iris uniform black;snout nearly truncate in dorsal view,slightly rounded in profile;tibiotarsal articulation of adpressed limb reaching level of eye;dorsal surface smooth;supratympanic fold present,prominent;outer metatarsal tubercle absent;tips of toes very weakly dilated into small discs;finger webbing absent,toe webbing rudimentary;dorsal surfaces of head and body orange-red with small irregularly shaped dark-brown patches;dorsal surface of limbs pale dark brown with small reddish speckles;body flanks dark brown anteriorly fading to grayish brown posteriorly with brown spots in groin area;lateral sides of head immaculate blackish brown without white patches;coloration of ventral surfaces immaculate dark gray.

关键词： Plateau orange brown

Towards understanding structure–property relations in materials with interpretable deep learning

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 157-168页

作者： Tien-Sinh Vu Minh-Quyet Ha Duong-nguyen nguyen Viet-Cuong nguyen Yukihiro Abe Truyen Tran huan Tran Hiori Kino Takashi Miyake Koji Tsuda Hieu-Chi Dam Japan Advanced Institute of Science and Technology NomiIshikawaJapan HPC SYSTEMS Inc. MinatoTokyoJapan Applied Artificial Intelligence Institute Deakin UniversityGeelongVICAustralia School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGAUSA Research and Services Division of Materials Data and Integrated System National Institute for Materials ScienceTsukubaIbarakiJapan Research Center for Computational Design of Advanced Functional Materials National Institute of Advanced Industrial Science and TechnologyTsukubaIbarakiJapan Department of Computational Biology and Medical Sciences Graduate School of Frontier SciencesUniversity of TokyoKashiwa-shiChiba-kenJapan International Center for Synchrotron Radiation Innovation Smart(SRIS) Tohoku UniversityAoba-kuSendaiJapan

Deep learning(DL)models currently employed in materials research exhibit certain limitations in delivering meaningful information for interpreting predictions and comprehending the relationships between structure and material *** address these limitations,we propose an interpretable DL architecture that incorporates the attention mechanism to predict material properties and gain insights into their structure–property *** proposed architecture is evaluated using two well-known datasets(the QM9 and the Materials Project datasets),and three in-house-developed computational materials ***–test–split validations confirm that the models derived using the proposed DL architecture exhibit strong predictive capabilities,which are comparable to those of current state-of-the-art ***,comparative validations,based on first-principles calculations,indicate that the degree of attention of the atoms’local structures to the representation of the material structure is critical when interpreting structure–property relationships with respect to physical *** properties encompass molecular orbital energies and the formation energies of *** proposed architecture shows great potential in accelerating material design by predicting material properties and explicitly identifying crucial features within the corresponding structures.

关键词： properties property structure

New insight into fracturing characterization of shale under cyclic soft stimulation:A lab-scale investigation

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

Petroleum Science 2022年第6期19卷 2830-2843页

作者： Qiang Gao Han cao Ting Bao Jiang-Zhan Chen huan-Xiao Hu Ping-He Sun School of Geoscience and Info-Physics Central South UniversityChangsha410083HunanChina Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education) Central South UniversityChangsha410083HunanChina Hubei Intelligent Geological Equipment Engineering Technology Research Center Wuhan430074HubeiChina Pacific Northwest National Laboratory RichlandWA99352USA School of Resources and Safety Engineering Central South UniversityChangsha410083HunanChina

The cyclic soft stimulation(CSS)is a new method of reservoir reforming for which the mechanism of fracturing crack propagation is ambiguous with regard to the alternating fluid *** study aims to provide a comprehensive understanding of the fracturing mechanical characterizations of CSS under different magnitudes and amplitudes of the alternating fluid *** emission(AE)is recorded to investigate the damage evolution under CSS based on the b value analysis of *** results reveal the difference of pressure in a crack under different cyclic fluid pressure *** AE results show that the maximum radiated energy under CSS tends to be reduced with the increase in the amplitude and magnitude of the alternating fluid *** finishing crucial touch is that the crack extending criterion under CSS is proposed,which combines the injection parameters,the rock properties and in-situ *** to the crack extending criterion,the fluctuation fluid pressure causes the reduction of a critical crack extending pressure,and the CSS causes the crack to initiate and propagate under low fluid *** a higher-value magnitude of alternating fluid pressure,the cyclic times of CSS is less for the crack *** supplement to the crack extending criterion,a distinct relationship between the radiated energy and the cyclic fluid pressure also is established based on the energy dissipation *** new findings provide an insight into the determination of crack extending criterion under CSS for efficiently implementing shale fracturing.

关键词： Cyclic soft stimulation Fracturing mechanical characterization Damage evolution Crack extending criterion Radiated energy

Microcrystal induced emission enhancement of a small molecule probe and its use for highly efficient detection of 2,4,6-trinitrophenol in water

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2018年第7期61卷 857-862页

作者： huan Liu Yanyan Fu Wei Xu Qingguo He Huimin cao Guohua Liu Jiangong Cheng College of Life and Environmental Sciences Shanghai Normal University State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

In this contribution, we reported a very simple and small molecule material, 2,5-dimethoxyterephthalaldehyde(DMA). It exhibited a relatively weak fluorescence in solution, while showed a steadily increased green fluorescence with typical aggregation-induced enhanced emission(AIE) effect for forming a cubic-like microcrystal structure in THF-H2 O mixed *** microcrystals presented significantly higher fluorescence than that of amorphous aggregates. The DMA microcrystals suspension showed a good response to 2,4,6-trinitrophenol(TNP) with a LOD of 1.2×10^(-7) M, which is the best result of TNP detection in aqueous solution. Quantum chemical calculation revealed that DMA is a donor(D)-receptor(A) type molecule with methoxy unit as donor and carbonyl moiety as receptor. Its emission arises from an intramolecular charge transfer(ICT) from methoxy units to carbonyl units. NMR indicated that there is a strong hydrogen bond interaction between DMA and *** bond interaction can effectively decrease the intermolecular distance of DMA and TNP, which will increase the efficiency of photoinduced electron transfer(PET) and fluorescence resonance energy transfer(FRET), and hence will be advantageous for its selectivity. The microcrystal induced enhanced emission could be generally used for kinds of target molecules analysis.

关键词： fluorescence probe microcrystal aggregation induced emission intramolecular charge transfer TNP

Organic nitrogen components in soils from southeast China

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第4期14卷 259-269页

作者： Xian-you CHEN Liang-huan WU Xiao-chuang cao Yuan-hong ZHU Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health College of Environmental and Resource SciencesZhejiang University Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition College of Environmental and Resource SciencesZhejiang University Department of Crop and Soil Sciences the Pennsylvania State UniversityUniversity ParkPennsylvania PA 16802USA

Objective:To investigate the amounts of extractable organic nitrogen(EON),and the relationships between EON and total extractable nitrogen(TEN),especially the amino acids(AAs) adsorbed by soils,and a series of other hydrolyzed soil nitrogen indices in typical land use soil types from southeast *** traditional agricultural planting conditions,the functions of EON,especially AAs in the rhizosphere and in bulk soil zones were also ***:Pot experiments were conducted using plants of pakchoi(Brassica chinensis L.) and rice(Oryza sativa L.).In the rhizosphere and bulk soil zone studies,organic nitrogen components were extracted with either distilled water,0.5 mol/L K2SO4or acid ***:K2SO4-EON constituted more than 30% of TEN pools.K2SO4-extractable AAs accounted for 25% of EON pools and nearly 10% of TEN pools in rhizosphere ***,both K2SO4-EON and extractable AAs contents had positive correlations with TEN ***:EON represented a major component of TEN pools in garden and paddy soils under traditional planting *** only a small proportion of the EON was present in the form of water-extractable and K2SO4-extractable AAs,the release of AAs from soil exchangeable sites might be an important source of organic nitrogen(N) for plant *** findings suggest that the content of most organic forms of N was significantly greater in rhizosphere than in bulk soil zone ***,it was also apparent that the TEN pool content was lower in rhizosphere than in bulk soil samples without added N.

关键词： Extractable organic nitrogen Amino acids Rhizosphere Bulk soil

A newly Found Biotite Syenogranite in the huangshaping Polymetallic Deposit, South China: Insights into Cu Mineralization

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2018年第3期29卷 537-555页

作者： Weicheng Jiang huan Li Jinghua Wu Zhekai Zhou Hua Kong Jingya cao Faculty of Earth Resources State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-Physics Central South University CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China

The W-Sn-Mo-Cu-Pb-Zn polymetallic mineralization in the huangshaping Deposit is associated with different types of Jurassic granitic intrusions such as quartz porphyry, granophyre and granite porphyry. In this study, we carried out detailed mineralogical, petrological, geochemical, zircon U-Pb geochronological and Hf isotopic studies on a newly found, Cu-mineralization-related finegrained biotite syenogranite at huangshaping. This syenogranite is mainly composed of quartz （40%）, K-feldspar （30%）, plagioclase （15%） and biotite （5%）, enriching in SiO2 （75.58 wt.%-76.02 wt.%）, K20 （5.24 wt.%-5.78 wt.%）, AI203 （12.23 wt.%-12.46 wt.%）, Rb （405 ppm-504 ppm）, U （18.5 ppm-40.7 ppm）, Th （47 ppm-52.3 ppm）, Nb （49.6 ppm-57.5 ppm）, and Cu （54 ppm-288 ppm） whereas depleting in P205 （0.01 wt.%）, TiO2 （0.05 wt.%-0.06 wt.%）, Ba （5 ppm-13.1 ppm）, Sr （6.8 ppm-23.9 ppm） and Eu （0.04 ppm-0.05 ppm）, with A1-type alkaline granite characteristics. Magmatic and hydrothermal zircons were separated from a Cu-mineralized syenogranite sample and yielded the ^206Pb/^238U concordant ages of 156.5±1.8 and 154.4±2.9 Ma, representing the intrusive age of the pluton and probable Cu-mineralization time at the huangshaping Deposit, respectively. Zircon Hf isotopes suggest a crust-derived （partial melting of Paleoproterozoic basement） magma for the syenogranite, with some degree of crust-mantle interaction. We infer that the syenogranite is a transitional phase between the granophyre and the granite porphyry, not only contributed greatly to the Cu mineralization but also provided W-Sn polymetallic ore-forming metals for the huangshaping Deposit.

关键词： zircon U-Pb dating Hf isotope A-type granite southern Hunan.

Novel Criteria for Exponential Stability of Linear Non-Autonomous Functional Differential Equations

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2019年第2期32卷 479-495页

作者： PHAM HUU ANH Ngoc THAI BAO Tran cao THANH Tinh nguyen DINH Huy Department of Mathematics Vietnam National University-HCMC International University Faculty of Information Systems Vietnam National University-HCMC University of Information Technology Department of Mathematics Vietnam National University-HCMC University of Information Technology Division of Applied Mathematics Faculty of Applied Sciences Vietnam National University-HCMC Ho Chi Minh city University of Technology

General linear non-autonomous functional differential equations are considered. Explicit criteria for exponential stability are given. Furthermore, the authors present an explicit robust stability bound for systems su... 详细信息

关键词： Exponential stability linear functional differential equations perturbation

Structure instability forecasting and analysis of giant rock pillars in steeply dipping thick coal seams

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第12期22卷 1233-1244页

作者： Xing-ping Lai huan Sun Peng-fei Shan Ming Cai Jian-tao cao Feng Cui Energy School Xi’an University of Science and Technology Key Laboratory of Western Mines and Hazard Prevention (Ministry of Education of China) Bharti School of Engineering Laurentian University

Structure stability analysis of rock masses is essential for forecasting catastrophic structure failure in coal seam mining. Steeply dipping thick coal seams （SDTCS） are common in the Urumqi coalfield, and some dynamical hazards such as roof collapse and mining-induced seismicity occur frequently in the coal mines. The cause of these events is mainly structure instability in giant rock pillars sand- wiched between SDTCS. Developing methods to predict these events is important for safe mining in such a complex environment. This study focuses on understanding the structural mechanics model of a giant rock pillar and presents a viewpoint of the stability of a trend sphenoid fractured beam （TSFB）. Some stability index parameters such as failure surface dips were measured, and most dips were observed to be between 46° and 51°. We used a digital panoramic borehole monitoring system to measure the TSFB＇s height （△H）, which varied from 56.37 to 60.50 m. Next, FLAC^3D was used to model the distribution and evolution of vertical displacement in the giant rock pillars; the results confirmed the existence of a TSFB structure. Finally, we investigated the acoustic emission （AE） energy accumulation rate and observed that the rate commonly ranged from 20 to 40 kJ/min. The AE energy accumulation rate could be used to anticipate impeding seismic events related to structure failure. The results presented provide a useful approach for forecasting catastrophic events related to structure instability and for developing hazard prevention technology for mining in SDTCS.

关键词： coal mining structural instability rock pillars forecasting acoustic emission (AE) steeply dipping coal beds

Design and Theoretical Research on Aerial-Aquatic Vehicles:A Review

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2023年第6期20卷 2512-2541页

作者： Yi Sun Xuefei Liu Kai cao huan Shen Qian Li Guangming Chen Jiajun Xu Aihong Ji Lab of Locomotion Bioinspiration and Intelligent Robots College of Mechanical and Electrical EngineeringState Key Laboratory of Mechanics and Control for Aerospace StructuresNanjing University of Aeronautics and Astronautics29 Yudao StreetNanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China

With the rapid development of unmanned aerial and underwater vehicles,various tasks,such as biodiversity monitoring,surveying,and mapping,as well as,search and rescue can now be completed in a single medium,either underwater or in the *** systematically examining the water–air cross-medium locomotion of organisms,there has been growing interest in the development of aerial-aquatic *** goal of this review is to provide a detailed outline of the design and cross-medium theoretical research of the existing aerial-aquatic vehicles based on the research on the organisms capable of transiting between water and *** these designs and theoretical frameworks have been validated in many aerial-aquatic vehicles,there are still many problems that need to be addressed,such as inflexible underwater motion and unstable medium *** a result,supplementation of the existing cross-medium biomimetic research,vehicle design,power selection,and cross-medium theory is urgently required to optimize the key technologies in ***,by summarizing the existing designs and theoretical approaches on aerial-aquatic vehicles,including biomimetic research on water–air cross-medium locomotion in nature,different power selections,and cross-medium theoretical research,the relative problems and development trends on aerial-aquatic vehicles were thoroughly explored,providing significant help for the subsequent research process.

关键词： Aerial-aquatic vehicle Cross-medium motion Power selection Control theory Biomimetic