检索结果-南通市图书馆

Management of CO_(2) in a tomato greenhouse using WSN and BPNN techniques

International Journal of Agricultural and Biological Engineering 2015年第4期8卷 43-51页

作者： Li Ting Zhang Man Ji Yuhan sha sha Jiang Yiqiong Li Minzan Key Laboratory of Modern Precision Agriculture System Integration Research Ministry of EducationCollege of Information and Electrical EngineeringChina Agriculture UniversityBeijing 100083China

Rational management of CO_(2) can improve the net photosynthetic rate of plants,thereby improving crop yield and *** order to precisely manage CO_(2) in a greenhouse,a wireless sensor network(WSN)system was developed to monitor greenhouse environmental parameters in real time,including air temperature,humidity,CO_(2) concentration,soil temperature,soil moisture,and light *** WSN system includes several sensor nodes,a gateway node,and remote management *** sensor nodes can collect 0-5 V and 4-20 mA analog signals and universal asynchronous receiver/transmitter(UART)*** gateway node can process and transmit the data and commands between sensor nodes and remote management *** remote management software provides a friendly interface between user and *** can inquire about real-time data,and set the parameters of the *** photosynthetic rate of tomato plants were studied in the flowering stage.A LI-6400XT portable photosynthesis analyzer was used to measure the photosynthetic rates of the tomato plants,and the environmental parameters of leaves were controlled according to the presetting *** photosynthetic rate prediction model of a single leaf was established based on a back propagation neural network(BPNN).The environmental parameters were used as input neurons after being processed by principal component analysis(PCA),and the photosynthetic rate was taken as the output *** performance of the prediction model was evaluated,and the results showed that the correlation coefficient between the simulated and observed data sets was 0.9899,and root-mean-square error(RMSE)was ***,when different CO_(2) concentrations were selected as the input to predict the photosynthetic rate,the simulated and observed data showed the same *** to the above analysis,it was concluded that the model can be used for quantitative regulation of CO_(2) for tomato plants in greenhouses.

关键词： WSN ZigBee greenhouse information photosynthetic rate CO_(2)fertilization

来源：

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

A CLASS OF FUNCTIONAL EQUATION AND FRACTAL INTERPOLATION FUNCTIONS

引用

Applied Mathematics(A Journal of Chinese Universities) 1999年第1期14卷 90-98页

作者： sha Zhen Dept. of Appl. Math. Zhejiang Univ. Hangzhou

Abstract A new class of functional equation in C 0(I) is investigated. It is proved that some class of FIF satisfies the functional equation. Another functional equation is constructed. Their solutions can approxi... 详细信息

关键词： 1991 MR Subject Classification 28A80 41A05

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Medaeops Guinot,1967(Brachyura,Xanthidae)from China seas,with the resurrection of Medaeops japonicus(Rathbun,1898)

引用

Journal of Oceanology and Limnology 2023年第6期41卷 2403-2417页

作者： Ziming YUAN Wei JIANG Zhongli sha Laboratory of Marine Organism Taxonomy and Phylogeny Qingdao Key Laboratory of Marine Biodiversity and ConservationInstitute of OceanologyChinese Academy of SciencesQingdao 266071China shandong Province Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laoshan Laboratory Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The xanthid genus Medaeops Guinot,1967 currently contains seven species reported from the Indo-West Pacific ***,only one species,Medaeops granulosus(Haswell,1882),has been recorded from China seas and was once thought to be widespread in the Indo-West Pacific *** this study,two species of the Medaeops granulosus species-group were identified during the analysis on Medaeops crabs from China *** japonicus(Rathbun,1898),which had previously been considered a junior synonym of ***,is shown to be a distinct species that can be distinguished from *** by the lower first anterolateral tooth,the larger and concentrated granules on carapace dorsally,and the different shape of the male’s first *** addition,a new recorded species,Medaeops edwardsi Guinot,1967,was reported from China seas for the first time.A molecular analysis was conducted to determine the status of each species,and an updated key for species of the genus Medaeops was provided.

关键词： euxanthine Xanthoidea crab Decapoda DNA barcode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental investigations on small-and full-scale ship models with polyurea coatings subjected to underwater explosion

引用

Defence Technology（防务技术） 2022年第7期18卷 1257-1268页

作者： Jian Liu Feng-jiang An Cheng Wu sha-sha Liao Ming-xue Zhou Dong-yu Xue Huan Guo State Key Laboratory Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Nowadays, the mitigation of damage to a ship caused by the underwater explosion attracts more and more attention from the modern ship designers. In this study, two kinds of scale tests were conducted to investigate the effects of polyurea coatings on the blast resistance of hulls subjected to underwater explosion. Firstly, small-scale model tests with different polyurea coatings were carried out. Results indicate that polyurea has a better blast resistance performance when coated on the front face, which can effectively reduce the maximum deflection of the steel plate by more than 20% and reduce the deformation energy by 35.7%-45.4%. Next, a full-scale ship(approximately 50 m × 9 m) under loadings produced by the detonation of 33 kg of spherical TNT charges was tested, where a part of the ship was coated with polyurea on the front face(8 mm + 24 mm) and not on the contrast area. Damage characteristics on the bottom were statistically analyzed based on a 3D scanning technology, indicating that polyurea contributes to enhancing the blast protection of the ship. However, damage results of this test were different from those of the small-scale tests. Moreover, the deformation area of the bottom with polyurea was greatly increased by 40.1% to disperse explosion energy, a conclusion that cannot be drown from the small-scale tests.

关键词： Polyurea coatings Small-scale model Full-scale ship Underwater explosion Blast resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrothermal Synthesis and Crystal Structure of a Cd^(2+) Supramolecular Coordination Complex{[Cd_2(HCAM)_2(H_2O)_4]·3.5H_2O}_n with a 3D Metal-organic Open Framework

引用

Chinese Journal of Structural Chemistry 2010年第7期29卷 1067-1071页

作者： ZHOU Qiu-Xiang LI sha-sha WANG Meng BAI Xiao-Jie Langfang Teachers College Langfang 065000 China College of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China

A three-dimensional coordination polymer {[Cd2（HCAM）2（H2O）4].***2O}n was synthesized by the hydrothermal reaction of H3CAM （H3CAM = 4-hydroxypyridine-2,6-dicerboxylic acid） and Cd（NO3）2·4H2O. The structure was characterized by elemental analysis, thermal gravimetric analysis, infrared spectroscopy and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.4389（19）, b = 11.009（2）, c = 11.192（2） A, α = 87.87（3）, β= 74.63（3）, γ = 81.22（3）°, V= 1108.2（4） A3, Z = 2, Dc= 2.164 g/cm3,μ = 2.011 mm^-1, F（000） = 710, R = 0.0419 and wR = 0.1170. X-ray analysis reveals that the title compound adopts a one-dimensional staircase structure by carboxyl of H3CAM and water molecules, and it is further linked by hydrogen bonds to form a 3-D metal-organic open framework. The thermal gravimetric analysis displays that the framework exists stably below 300 ℃.

关键词： hydrothermal synthesis 3D coordination polymer crystal structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Zener-Hollomon parameter on deformation microstructure in Fe-3%Si alloy

引用

Acta Metallurgica Sinica(English Letters) 2011年第1期24卷 1-8页

作者： Fenghui AN Yuhui sha Fang ZHANG Liang ZUO Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern UniversityShenyang I10819 China

Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBSD） and transmission electron microscopy （TEM） were used to characterize the deformation microstructure on various scales. Dynamic recovery is the dominant softening mechanism under all experimental conditions. A dynamic recovery region and partial dynamic recrystallization region can be distinguished according to Zener-Hollomon parameter （Z） based on OM observation. Furthermore, the quantitative description of subgrain size and boundary misorientation has been set up as a function of Zener-Hollomon Darameter.

关键词： Fe-3%Si Hot deformation Microstructure Zener-Hollomonparameter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Relative contributions of temperature and salinity to steric sea level over the South China Sea

引用

Journal of Oceanology and Limnology 2022年第2期40卷 428-437页

作者： Jin sha Xiaoming LI Xiaohai YAN Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Hainan Key Laboratory of Earth Observation Sanya 502022China Center for Remote Sensing College of EarthOcean and EnvironmentUniversity of DelawareNewark 19711DEUSA Joint Institute for Coastal Research and Management University of Delaware/Xiamen UniversityUSA/China

The relative contributions of surface temperature and salinity to steric sea-level variations are investigated using satellite observations and reanalysis *** defi ning a contribution factor,the relative roles of thermal and haline steric height variations are quantifi ed over the South China Sea(SCS).The thermosteric height dominates the steric sea level variation in the northern SCS deep basin,while the contribution of the halosteric height increases *** investigation reveals that this transition is related to the meridional imbalance of surface heat flux and precipitation *** revealed steric constitution distribution is not confi ned to the surface but extends within the upper layer to approximately 50m depth,and then the thermosteric component dominates from the depth *** results of this study clarify the steric sea level constitution over the SCS,benefit the understanding of sea-level variations at the regional scale,and may further facilitate multisensor remote sensing data mining studies.

关键词： South China Sea(SCS) steric height steric constitution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Involvement of glucose transporter 4 in ovarian development and reproductive maturation of Harmonia axyridis(Coleoptera:Coccinellidae)

引用

Insect Science 2022年第3期29卷 691-703页

作者： Yan Li sha-sha Wang Su Wang Shi-Gui Wang Bin Tang Fang Liu College of Horticulture and Plant Protection Yangzhou UniversityYangzhouJiangsu225009China College of Life and Environmental Sciences Hangzhou Normal UniversityHangzhouZhejiang310036China Institute of Plant and Environment Protection Beijing Academy of Agricultural and Forestry SciencesBeijing100097China

Glucose is vital to embryogenesis,as are glucose *** transporter 4(Glut4)is one of the glucose transporters,which is involved in rapid uptake of glucose by various cells and promotes glucose *** energy metabolism in insect reproduction is well known,the molecular mechanism of Glut4 in insect reproduction is poorly *** suspect that Glut4 is involved in maintaining glucose concentrations in the ovaries and affecting vitellogenesis,which is critical for subsequent oocyte maturation and insect *** axyridis(Pallas)is a model organism for genetic research and a natural enemy of insect *** studied the influence of the Glut4 gene on the reproduction and development of *** using RNA interference *** transcription quantitative polymerase chain reaction analysis revealed that HaGlut4 was most highly expressed in *** of the HaGlut4 gene reduced the transcript levels of HaGlut4,and the weight and number of eggs produced significantly *** addition,the transcript levels of vitellogenin receptor and vitellogenin in the fat bodies and the ovaries of *** decreased after the interference of Glut4,and decreased the triglyceride,fatty acid,total amino acid and adenosine triphosphate content of *** resulted in severe blockage of ovary development and reduction of yolk formation;there was no development of ovarioles in the developing *** changes indicate that a lack of HaGlut4 can impair ovarian development and oocyte maturation and result in decreased fecundity.

关键词： glucose transporter 4(Glut4) Harmonia axyridis RNAi reproduction vitellogenin

来源：

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

The Extended Hybrid Carrier-Based Multiple Access Technology for High Mobility Scenarios

引用

China Communications 2024年第1期21卷 53-68页

作者： Ge Song Xiaojie Fang Xuejun sha School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

The hybrid carrier(HC)system rooted in the carrier fusion concept is gradually garnering *** this paper,we study the extended hybrid carrier(EHC)multiple access scheme to ensure reliable wireless *** employing the EHC modulation,a power layered multiplexing framework is realized,which exhibits enhanced interference suppression capability owing to the more uniform energy distribution *** implementation method and advantage mechanism are explicated respectively for the uplink and downlink,and the performance analysis under varying channel conditions is *** addition,considering the connectivity demand,we explore the non-orthogonal multiple access(NOMA)method of the EHC system and develop the EHC sparse code multiple access *** proposed scheme melds the energy spread superiority of EHC with the access capacity of NOMA,facilitating superior support for massive connectivity in high mobility *** results have verified the feasibility and advantages of the proposed *** with existing HC multiple access schemes,the proposed scheme exhibits robust bit error rate performance and can better guarantee multiple access performance in complex scenarios of nextgeneration communications.

关键词： extended hybrid carrier system high mo-Received:Jun.09,2023 Revised:Nov.20,2023 Editor:Yuanwei Liu bility communications multiple access

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sediment resuspension under action of wind in Taihu Lake,China

引用

International Journal of Sediment Research 2015年第1期30卷 48-62页

作者： sha-sha ZHENG Pei-fang WANG Chao WANG Jun HOU Key Laboratory of Integrated Regulation and Resource Department on shallow Lakes Ministry of EducationCollege of EnvironmentHohai University College of Environment Hohai University

A field study was undertaken to investigate the changes of the current speed,wave parameters and sediment resuspension under different wind speeds in the Taihu *** Acoustic Doppler Current Profiler(ADCP) and MIDAS DWR Wave Recorder were used to collect the data of currents and waves,*** characteristics of sediment resuspension were investigated by a layered sampling *** measurement results showed that the current speed increased in direct proportion with the wind *** distributions of the current speed represented significant inflection points at 0.4 of the relative water *** the upper and lower layers followed logarithmic *** mean wind speed and wave parameters(wave height and wave energy density) showed exponential distributions,meanwhile similar distribution was found between the mean wind speed and current *** rising surface wind,a corresponding increase in the concentration and particle size of the Suspended Particulate Matter(SPM) was observed in the water *** kinds of particles could influence the SPM concentration in the water *** critical wind speed of sediment resuspension and the corresponding sediment incipient shear stress was found to be 3.7-4.0 m s-1and 0.011 N m-2,*** results of this study can be used to help understand and predict the changes of flow structure and water quality induced by different wind disturbances in shallow lakes.

关键词： Wind disturbance Current Wave Sediment resuspension Taihu Lake

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：