检索结果-内蒙古大学图书馆

International Conference on Electronics technology (ICET)

作者： Li Jun Xie Wujun Aviation Key Laboratory of Science and Technology on Life-support Technology AVIC Aerospace Life-support Industries LTD. Xiangyang China

ISBN: (数字)9781728162836

ISBN: (纸本)9781728162843

The cooperative MIMO (CMIMO) technology having characteristics of low energy expended and high reliability can be very well suited to resource-constrained event-driven wireless sensor networks (WSNs), in which collecting date is unpredictable for space and time. A novel energy-efficient STBC-based CMIMO transmission scheme is put forward for event-driven WSNs in this letter, which adopts cross-layer design and dynamic event cluster. Detailed energy models are developed to maximize energy saving by the joint optimization for the number of cooperative nodes and constellation size. Through computer simulation, It can be found that the novel transmission scheme saves more energy in comparison with the traditional transmission protocol.

关键词： CMIMO event-driven WSNs energy-efficient STBC the joint optimization even-driven program space time block coding Energy efficiency transport protocols ENERGY MODELS multiple input multiple output systems

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation and experimental research of shear-driven water film on flat plate

Numerical simulation and experimental research of shear-driv...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Qinyang Li Ning Guan Bo Ning Guangya Zhu Dalin Zhang Weijian Chen Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing People's Republic of China College of Aeronautics Shandong Jiaotong University No.5001 Haitang Road Changqing University Science and Technology Park Jinan People's Republic of China Utility System Design and Research Department Jiangxi Hongdu Aviation Industry Group Company Ltd. Nanchang People's Republic of China

ISBN: (数字)9781837242108

The supercooled water droplets in the air will form a water film on the aircraft during flight, which will then form icing, which will have an impact on the aerodynamic performance of the aircraft and even endanger the flight safety. In this paper, based on the Eulerian Wall Films model, the partial wetting effect is introduced, and the water film flow on flat plates driven by airflow shear force is investigated. The flow behaviours of water film with different contact angles under different flow rates were explored through water film test. The effectiveness of the calculation method for water film flow characteristics in this paper was verified by comparison between numerical simulation and test records, which laid a foundation for the anti-icing calculation in subsequent studies.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on measurement method of six degree of freedom for head based on safetr of aircraft pilot seat

Research on measurement method of six degree of freedom for ...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： G. Luo Z. Jin W. Xie R. Wang Aviation Key Laboratory of Science and Technology on Life-support Technology Xiangyang Hubei China AVIC Aerospace Life-support Industries Ltd. China

In order to ensure the safety of the pilot's life, the six degree of freedom data of the ATD head need to be obtained through dynamic impact test to evaluate the possibility of head injury in the cockpit. A binocular photogrammetry method by the simplified solution of normal equation based on bundle adjustment was proposed. On the basis of satisfying the imaging requirements of high-speed cameras, the 3D position and posture data of the head were obtained by shooting and analyzing the images of the test process.

关键词： vehicle dynamics photogrammetry seats biomechanics impact testing injuries air safety stereo image processing pose estimation aircraft testing aerospace engineering dynamic testing

来源：评论

学校读者我要写书评

暂无评论

Research on FSI dynamic characteristics of parafoil trailing edge deflection 32

Research on FSI dynamic characteristics of parafoil trailing...

引用

32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Gao, Xinglong Zhang, Qingbin Li, Zhihui Chen, Qin Wang, Wenkai State Aerodynamic Key Laboratory China Aerodynamic R&D Center Mianyang621000 China College of Aerospace Science and Technology National Defense Technology University Changsha430100 China Beijing Pioneering Innovation Center of China Aerodynamics Research and Development Center Beijing100191 China Technology Center AVIC Aerospace Life-Support Industries. Ltd Xiangfan441001 China

ISBN: (纸本)9783932182914

The parafoil is manipulated by pulling the trailing edge to realize maneuvering, turning, and landing etc., which involves the coupling process between the flexible fabric structure and aerodynamics. Based on the transient nonlinear dynamics' method, the FSI dynamic behaviors of trailing edge deflection is numerically simulated and analyzed. The Structured-ALE (SALE) models algorithm as well as the penalty method are both utilized to modeling the coupling fields and interface, by which the computing efficiency is highly improved. The stress distribution and structure strength of canopy is visualized and analyzed, the surrounding flow field is also visualized in 3D, the evolution mechanisms such as flow separation are studied. At last, the influence of deflection angle as well as the turning position on FSI dynamic characteristics are comparatively analyzed. The results validated the efficiency of our method and could be a good support for the design and application of large parafoil. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Efficiency

来源：评论

学校读者我要写书评

暂无评论

Improving session-to-session transfer performance of emotion recognition using adaptive support vector machine 4

Improving session-to-session transfer performance of emotion...

引用

2020 4th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2020

作者： Yang, Kai Bao, Guangcheng Zeng, Ying Tong, Li Shu, Jun Yan, Bin Henan Key Laboratory of Imaging and Intelligent Processing PLA Strategic Support Force Information Engineering University Henan Zhengzhou China Key Laboratory for Neuro Information of Ministry of Education School of Life Science and Technology University of Electronic Science and Technology of China Sichuan Chengdu China

The non-stationarity of electroencephalograph (EEG) signals has been a barrier in real-life application of EEG-based emotion recognition. The features extracted from emotional EEG vary from one session to another and a model trained on a temporally-limited EEG dataset may generalize poorly to data recorded at a different time for the same individual. In this study, the EEG features that stably characterize the differences between emotions are firstly explored. Then the classic progressive transductive support vector machine (PTSVM) is extended to three-classes classifications by a new region labelling rule, furthermore K-nearest neighbour algorithm and iterative process are utilized to improve the confidence of the predicted labels. Experimental results indicate that high gamma band local activation difference features and network features derived from prefrontal lobe, the temporal lobe on both sides, the left occipital-parietal lobe, the right occipital lobe and the posterior occipital lobe are temporally stable features for distinguishing different emotions (positive, neutral and negative). And the proposed session-to-session transfer model achieves an averaged classification accuracy 63.56% for three emotions classification on our dataset recorded from 23 subjects in three different days, which is 4% higher than the existing best adaptive classification model. Hence, the proposed classification model can effectively improve the performance of EEG-based session-to-session emotion recognition. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Emotion Recognition

来源：评论

学校读者我要写书评

暂无评论

Chromosome organization and gene expansion in the highly fragmented genome of the ciliate Strombidium stylifer

引用

Journal of Genetics and Genomics 2021年第10期48卷 908-916页

作者： Chao Li Xiao Chen Weibo Zheng Thomas G.Doak Guangyi Fan Weibo Song Ying Yan Institute of Evolution&Marine Biodiversity Ocean University of ChinaQingdao 266003China Marine College Shandong UniversityWeihai 264209China School of Life Sciences Ludong UniversityYantai 264025China Department of Biology Indiana UniversityBloomingtonIN 47405USA National Center for Genome Analysis Support Indiana UniversityBloomingtonIN 47405USA BGI-Qingdao BGI-ShenzhenQingdao 266555China State Key Laboratory of Agricultural Genomics BGI-ShenzhenShenzhen 518083China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Chromosomes are well-organized carriers of genetic information in eukaryotes and are usually quite long,carrying hundreds and thousands of ***,a clade of single-celled ciliates,Spirotrichea,feature nanochromosomes—also called“gene-sized chromosomes”.These chromosomes predominantly carry only one gene,flanked by short telomere ***,the organization and copy number variation of the chromosomes in these highly fragmented genomes remain unexplored in many groups of Spirotrichea,including the marine *** deep genome sequencing,we assembled the macronuclear genome of Strombidium stylifer into more than 18,000 nanochromosomes(~2.4 Kb long on average).Our results show that *** occupies an intermediate position during the evolutionary history of Strombidium lineage and experienced significant expansions in several gene families related to guanyl ribonucleotide *** on the nucleotide distribution bias analysis and conserved motifs search in non-genic regions,we found that the subtelomeric regions have a conserved adenine-thymine(AT)-rich sequence *** also found that the copy number of nanochromosomes lacks precise *** work sheds light on the unique features of chromosome structure in eukaryotes with highly fragmented genomes and reveals that a rather specialized evolutionary strategy at the genomic level has resulted in great diversity within the ciliated lineages.

关键词： Ciliate Copy number Nanochromosome Nucleotide distribution bias Strombidium stylifer

来源：评论

学校读者我要写书评

暂无评论

Multi-Objective Optimization of Integrated Lithium-Ion Battery Thermal Management System

SSRN

引用

SSRN 2022年

作者： Shi, Hong Liu, Meinan Li, Yonghao Wang, Shuheng Qiu, Chenghui Cheng, Mengmeng Yuan, Jie Yang, Kaijie Kang, Chuanzhi College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

The heat generation rate of lithium-ion battery increases dramatically with the increase in the charge/discharge rate of the battery. Battery thermal management system (BTMS) based on phase change materials (PCM) are demonstrating great performance in the field of high heat flux heat dissipation. However, traditional hybrid PCM modules focus too much on their thermal performance and ignore the weight issue, which greatly reduces their wide application. In this paper, a BTMS integrated air-cooling channels, fins and PCM is proposed to improve the thermal performance of the battery. Based on the entropy weight-TOPSIS method, the balance of battery cells temperature uniformity and lightweight of lithium batteries is studied and the parameters of the optimal BTMS are obtained. The results demonstrate that the thermal performance of the battery is enhanced as the increase of PCM volume, but the weight of the system also increases significantly. When the height of the fins increases, the reasonable utilization of PCM increases and the PCM melts more evenly. Entropy weight-TOPSIS can help us to find the optimal solution between thermal performance and lightweight design. After the TOPSIS algorithm search, the optimal structural solution corresponding to the PCM thickness ( d ) = 7.5 mm and the fin height ( h ) = 65 mm has the smallest Euclidean distance Si+ from the positive ideal solution, and the largest Euclidean distance Si- from the negative ideal solution, thus it obtains a higher Ci and the highest priority. The corresponding maximum temperature ( Tmax), temperature difference (∆T) and weight (W) are 319.29 K, 0.0135 K and 5.13 kg respectively. © 2022, The Authors. All rights reserved.

关键词： Multiobjective optimization

来源：评论

学校读者我要写书评

暂无评论

Numerical study of thermal-hydraulic performances of microchannel heat sinks with different channel structures

Numerical study of thermal-hydraulic performances of microch...

引用

CSAA/IET International Conference on Aircraft Utility Systems 2020, AUS 2020

作者： Zhang, Gaogao Xu, Yu Dai, Qiumin School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781839535635

Numerical simulations were carried out to investigate the thermal-hydraulic characteristics of water flowing through different heat sinks. Calculations show that the internal fin structure of the heat sink has an important influence on the flow resistance and heat transfer. The zigzag channel has the largest flow resistance, while the straight channel has the smallest flow resistance, but the heat transfer capacity is opposite. In addition, the performance of heat sinks when inserting pin fins with different shapes in straight channels was also compared. The results show that the thermal resistance of circular pin fins is the smallest. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Microchannels

来源：评论

学校读者我要写书评

暂无评论

Equivalent study on delethalization test for sled head injury criteria test of civil aircraft passenger seat

Equivalent study on delethalization test for sled head injur...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Z. Jin W. Shen G. Luo M. Li Z. Jia W. Zhou L. Jia L. Zhang Aviation Key Laboratory of Science and Technology on Life-support Technology Xiang yang China Test Department AVIC Aerospace Life-Support Industries LTD No.29 Xinhua road Xiang yang China

The equivalent study between delethalization test and sled HIC test is in order to improve the efficiency of Head Injury Criteria (HIC) test on civil aircraft passenger seats, as well as to reduce the test consumption and cost. The equivalent impact model was established based on the equal rotatory kinetic energy, then the test of equal energy impact was designed and the delethalization test was carried out. The results of delethalization test and sled HIC test show that all the deviation value of HIC, peak head center of gravity (CG) acceleration in X direction, peak head CG resultant acceleration and the deformation of the seat back (C/B) was within ± 20%. In conclusion, the equivalent impact model in this paper is suitable, and the delethalization test be used as an equivalent method for sled HIC test is feasible.

关键词： aircraft seats biomechanics vibrations vehicle dynamics impact (mechanical) safety devices injuries elasticity impact testing

来源：评论

学校读者我要写书评

暂无评论

Simulation study on dynamic opening characteristics of airplane drag chute under the condition of stable crosswind

Simulation study on dynamic opening characteristics of airpl...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： L. Jin P. Yang X. Hu H. Li L. Zhang D. Cui Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang China AVIC The First Aircraft Institute Institute of mechanical and electrical system Xi’an China

In this paper, the ALE fluid-solid coupling algorithm is used to realize the simulation of the dynamic opening process of a certain type of airplane drag parachute. Based on the drag parachute working principle and folding process, a finite element model of the main parachute in the installed state is established. In the LS-DYNA software, the parachute opening characteristics of the drag parachute were simulated and analyzed under no crosswind conditions and Stable crosswind conditions at speed 10m/s. The results show that, under the condition of no crosswind, the error of the important parameters such as parachute straightening force, parachute opening dynamic load, parachute deflection angle and test data is less than 15%, and the simulation accuracy meets the engineering development requirements. On this basis, the parameters such as the unfolding shape, deflection angle, and stress state of the parachute parachute under stable crosswind conditions, which are difficult to test and simulate, were studied. This will provide a theoretical basis and technical approach for drag chute design and other types of parachute product research.

关键词： finite element analysis parachutes aerospace simulation aerospace testing drag design engineering

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：