检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于RSSI和惯性导航的融合室内定位算法

电信科学 2017年第10期33卷 99-106页

作者：朱亚萍夏玮玮章跃跃燕锋左旭舟沈连丰东南大学移动通信国家重点实验室江苏南京210096 电子科技大学信息与软件工程学院四川成都610054

针对目前对高精度室内定位算法的需求,提出一种基于接收信号强度识别(RSSI)和惯性导航的融合室内定位算法。基于无线传感网中Zig Bee节点的RSSI值,采用位置指纹识别算法,对网络中的未知节点进行定位。结合惯性传感单元(IMU)提供的惯性数... 详细信息

针对目前对高精度室内定位算法的需求,提出一种基于接收信号强度识别(RSSI)和惯性导航的融合室内定位算法。基于无线传感网中Zig Bee节点的RSSI值,采用位置指纹识别算法,对网络中的未知节点进行定位。结合惯性传感单元(IMU)提供的惯性数据,对RSSI定位结果进行融合修正。利用Kalman滤波器,采用状态方程描述待定位节点位置坐标的动态变化规律,从而实现一种以无线传感网络定位为主、IMU为辅的融合定位方法。仿真结果表明,提出的融合定位算法既能改善单独使用RSSI定位受环境干扰较大的问题,又能避免单独使用惯性导航带来的累积误差,极大地提高了定位精度。

关键词：高精度室内定位接收信号强度识别惯性导航融合定位算法

《环境科学与工程原理》研究生课程教学改革与实践

在线全文

学校读者我要写书评

暂无评论

广东化工 2019年第11期46卷 244-244,242页

作者：吴彦付川夏亚平闫彬蒋德敏重庆三峡学院环境与化学工程学院

《环境科学与工程原理》是环境科学与工程学科硕士研究生的核心专业课程,旨在培养胜任环境科学与工程相关工作的高素质综合创新型人才。然而之前的教学方式已经无法适应该课程的教学目标需要。为了提高学生的学习兴趣,实现本门课程的教... 详细信息

《环境科学与工程原理》是环境科学与工程学科硕士研究生的核心专业课程,旨在培养胜任环境科学与工程相关工作的高素质综合创新型人才。然而之前的教学方式已经无法适应该课程的教学目标需要。为了提高学生的学习兴趣,实现本门课程的教学目的,本文从教学内容和教学方式等方面对本门课程进行全面改革,效果显著。

关键词：环境科学与工程原理教学内容教学方式改革

Geometric modeling of Holocene large-river delta growth patterns,as constrained by environmental settings

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第2期64卷 318-328页

作者： Gaocong LI Qiong xia yaping WANG Zhiqiang LI Shu GAO Department of Marine Technology Guangdong Ocean UniversityZhanjiang 524088China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Marine Resources Big Data Center of South China Sea Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang)(Zhanjiang Bay Laboratory)Zhanjiang 524088China State Key Laboratory for Estuarine and Coastal Research East China Normal UniversityShanghai 200046China

Topographic/bathymetric conditions of the continental shelf can significantly influence the long-term growth of river *** particular,these conditions constrain the accommodation space for sedimentation in the deltaic *** this study,we use a conceptual geometric model to evaluate the role played by this factor,on the basis of the principle of mass *** Ganges-Brahmaputra,Mekong and Nile deltas are examined as three typical examples,in terms of their different original seabed *** control variate method is applied to eliminate the effect of the difference in model input *** results show that,assuming a constant sediment load,the delta growth rate will decrease with time;a higher value of the original seabed slope leads to a lower shoreline progradation rate for the subaerial delta and a higher growth rate for the subaqueous ***,the original seabed morphology represented by slope is a critical factor affecting the evolution of Holocene large-river *** results explain the interrelationships between sediment load,deltaic plain area,and the original seabed slopes for the 27 large-river deltas worldwide,located in the middle/low latitudes,with different tectonic *** the future,the conceptual geometric model may be combined with sediment dynamic modeling to identify more details of the evolution of these deltas.

关键词： Large-river deltas Original topography/bathymetry Geometric modeling Growth geometry Holocene

Modeling the circulation and sediment transport in the Beibu Gulf

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2017年第4期36卷 21-30页

作者： CHENG Gaolei GONG Wenping WANG yaping xia Zhen School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210023 China Collaborative Innovation Center of South China Sea Studies Nanjing University Nanjing 210093 China Center for Coastal Ocean Science & Technology Research School of Marine Sciences Sun Yat-sen University Guangzhou 510275 China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou 510275 China Guangzhou Marine Geological Survey Guangzhou 510075 China

Water circulation and sediment transport in the Beibu Gulf are important for its environmental protection and resource *** employing the Regional Ocean Modeling System（ROMS）,we studied the seasonal variation of circulation,sediment transport and long-term morphological evolution in the Beibu *** simulation results show that the circulation induced by tide and wind is cyclonic both in winter and summer in the gulf and that the wind-driven circulation is stronger in winter than that in *** sediment concentration is higher in the Qiongzhou Strait,west of the Hainan Island and the coast of Vietnam and the Leizhou *** sediment is transported westwards in winter and eastwards in summer in the Qiongzhou *** west entrance of the Qiongzhou Strait is dominated by westward transport all the year *** sediment discharged by rivers is deposited near the river *** simulated result demonstrates that the sediment transport is mainly controlled by tidal induced bottom resuspension in the Beibu *** characteristics are summarized for the distribution patterns of erosion and deposition.（1） The erosion and deposition are insignificant in most area of the gulf.（2） Sediment deposition is more significant in the mouths of Qiongzhou Strait.（3） The erosion is observed in the seabed of Qiongzhou Strait.（4） Erosion and deposition occur alternatively in the west of Hainan Island.

关键词： Beibu Gulf circulation sediment transport Regional Ocean Modeling System(ROMS)

在线全文

学校读者我要写书评

暂无评论

聚甘油酯在化妆品中的应用

广东化工 2018年第16期45卷 66-68,92页

作者：罗利李文锋饶刚葛先卫夏亚平广州蜜妆生物科技有限公司广东广州511450

本文筛选出天然植物来源的聚甘油酯类乳化剂与传统乳化剂,通过配方设计及性能评价的实验研究对比,确定了聚甘油酯类在化妆品中的广泛应用优点;能形成稳定的液晶状态、具有较强的保湿性、乳化体肤感更滋润、温和、卸妆能力更强。

关键词：聚甘油聚甘油酯乳化体液晶保湿温和卸妆

Preparation of thalidomide nano-flakes by supercritical antisolvent with enhanced mass transfer

在线全文

学校读者我要写书评

暂无评论

Particuology 2012年第1期10卷 17-23页

作者： HeyangJin Melinda Hemingway Ram B. Gupta Fei xia yaping Zhao School of Chemistry and Chemical Engineering ShanghaiJiaotong University Shanghai China Department of Chemical Engineering Auburn University Auburn AL USA

Thalidomide treats multiple myeloma and protracts life-span of patient, but its bioavailability is limited as it is poorly water soluble. Thalidomide nano-flakes are produced to improve the drug dissolution rate. Two nanoflake production methods are utilized for a comparative study： a supercritical antisolvent （SAS） method and a supercritical antisolvent with enhanced mass transfer （SAS-EM）. SAS-EM utilizes ultrasonication to improve dispersion upon injection within the supercritical carbon dioxide. Comparative study of SAS and SAS-EM thalidomide confirmed that the application of ultrasonication improved the micro/nano particles produced by SAS. The effects of ultrasound power on the formation of thalidomide particles are examined. The particle size and morphology were characterized by SEM. The thalidomide nano-flakes produced by SAS-EM were smaller than the particles produced by SAS. Dissolution rates of the produced particles, evaluated by HPLC, demonstrated an increase in the thalidomide dissolution rate for the SAS-EM produced particles, The polymorphs and crystallinity of thalidomide particles （flakes） were observed by FTIR and XRD. In this research, the supercritical processing significantly modified the crystal formation of thalidomide from an original state of a β-polymorph to the amorphous state α-polymorph after suoercritical orocessing.

关键词： Supercritical Anti-solventUltrasound Thalidomide Nano-flakes Polymorph

Multi-Feature Fusion-Guided Multiscale Bidirectional Attention Networks for Logistics Pallet Segmentation

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第6期131卷 1539-1555页

作者： Weiwei Cai yaping Song Huan Duan Zhenwei xia Zhanguo Wei School of Logistics and Transportation Central South University of Forestry and TechnologyChangsha410004China Graduate School Northern Arizona UniversityFlagstaffAZ 86011USA

In the smart logistics industry,unmanned forklifts that intelligently identify logistics pallets can improve work efficiency in warehousing and transportation and are better than traditional manual forklifts driven by ***,they play a critical role in smart warehousing,and semantics segmentation is an effective method to realize the intelligent identification of logistics ***,most current recognition algorithms are ineffective due to the diverse types of pallets,their complex shapes,frequent blockades in production environments,and changing lighting *** paper proposes a novel multi-feature fusion-guided multiscale bidirectional attention(MFMBA)neural network for logistics pallet *** better predict the foreground category(the pallet)and the background category(the cargo)of a pallet image,our approach extracts three types of features(grayscale,texture,and Hue,Saturation,Value features)and fuses *** multiscale architecture deals with the problem that the size and shape of the pallet may appear different in the image in the actual,complex environment,which usually makes feature extraction *** study proposes a multiscale architecture that can extract additional semantic ***,since a traditional attention mechanism only assigns attention rights from a single direction,we designed a bidirectional attention mechanism that assigns cross-attention weights to each feature from two directions,horizontally and vertically,significantly improving ***,comparative experimental results show that the precision of the proposed algorithm is 0.53%–8.77%better than that of other methods we compared.

关键词： Logistics pallet segmentation image segmentation multi-feature fusion multiscale network bidirectional attention mechanism HSV neural networks deep learning

Predicting sediment flux from continental shelf islands,southeastern China

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 Oceanology and Limnology 2021年第2期39卷 472-482页

作者： Gaocong LI xiaoming xia Jianjun JIA yaping WANG Tinglu CAI Shu GAO Department of Marine Technology Guangdong Ocean UniversityZhanjiang 524088China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China State Key Laboratory for Estuarine and Coastal Research East China Normal UniversityShanghai 200241China

Continental shelf islands are contributors of terrestrial sediment supply to shelf regions,and the sediment flux from these islands shall be *** calculated the sediment flux of continental shelf islands in the southeastern China using two empirical equations under two *** first,the sediment load/yield of the islands has the same pattern as the adjacent small,mountainous rivers along the coastline;and the second,each of the islands was treated as a single *** results show that the sediment supply from these islands reached an order of magnitude of 1 Mt/a,which is comparable to the supply from the local smaller rivers.A sensitivity analysis indicates that this value represents the lower limit of estimate;if the accurate amount of sub-catchments of any island is considered,then this value will be enhanced *** study demonstrates that the sediment supply from continental shelf islands to oceans is an important factor affecting the regional sedimentation and,therefore,should be paid with attention.

关键词： continental shelf islands sediment flux local rivers shelf mud deposits East and South China Seas

在线全文

学校读者我要写书评

暂无评论

碘盐监测的质量管理

福建分析测试 2002年第4期11卷 1676-1678页

作者：夏亚平林章清赵磬马宁何萌林兆和林曙光福建省卫生防疫站福建福州350001

在碘盐监测过程中,从采样到样品管理,尤其是实验室内、外部质量控制;直至出具检测报告,实施全程质量管理,既提高了工作效率,也提高了实验室检测水平。向社会提供了公正、准确的卫生监测数据,为碘缺乏病防治提供了科学、可靠的依据。

关键词：碘盐监测实验室质量管理