检索结果-南通市图书馆

同方期刊数据库博看期刊

Prediction of three-dimensional ocean temperature in the South China Sea based on time series gridded data and a dynamic spatiotemporal graph neural network

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第7期43卷 26-39页

作者： Feng nan Zhuolin Li Jie Yu Suixiang shi Xinrong Wu Lingyu Xu Department of Computer Engineering and Science Shanghai UniversityShanghai 200444China Key Laboratory of Digital Ocean National Marine Data and Information ServiceTianjin 300171China

Ocean temperature is an important physical variable in marine ecosystems,and ocean temperature prediction is an important research objective in ocean-related ***,one of the commonly used methods for ocean temperature prediction is based on data-driven,but research on this method is mostly limited to the sea surface,with few studies on the prediction of internal ocean *** graph neural network-based methods usually use predefined graphs or learned static graphs,which cannot capture the dynamic associations among *** this study,we propose a novel dynamic spatiotemporal graph neural network(DSTGN)to predict threedimensional ocean temperature(3D-OT),which combines static graph learning and dynamic graph learning to automatically mine two unknown dependencies between sequences based on the original 3D-OT data without prior *** and spatial dependencies in the time series were then captured using temporal and graph *** also integrated dynamic graph learning,static graph learning,graph convolution,and temporal convolution into an end-to-end framework for 3D-OT prediction using time-series grid *** this study,we conducted prediction experiments using high-resolution 3D-OT from the Copernicus global ocean physical reanalysis,with data covering the vertical variation of temperature from the sea surface to 1000 m below the sea *** compared five mainstream models that are commonly used for ocean temperature prediction,and the results showed that the method achieved the best prediction results at all prediction scales.

关键词： dynamic associations three-dimensional ocean temperature prediction graph neural network time series gridded data

Quantifying the agreement and accuracy characteristics of four satellite-based LULC products for cropland classification in China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第1期23卷 283-297页

作者： Jie Xue Xianglin Zhang Songchao Chen Bifeng Hu nan Wang Zhou shi Department of Land Management Zhejiang UniversityHangzhou 310058China Institute of Applied Remote Sensing and Information Technology College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China Department of Land Resource Management School of Public Finance and Public AdministrationJiangxi University of Finance and EconomicsNanchang 330013China Key Laboratory of Data Science in Finance and Economics Jiangxi University of Finance and EconomicsNanchang 330013China Key Laboratory of Spectroscopy Sensing Ministry of Agriculture and Rural AffairsHangzhou 310058China

Various land use and land cover(LULC)products have been produced over the past decade with the development of remote sensing *** the differences in LULC classification schemes,there is a lack of research on assessing the accuracy of their application to croplands in a unified ***,this study evaluated the spatial and area accuracies of cropland classification for four commonly used global LULC products(i.e.,MCD12Q1V6,GlobCover2009,FROM-GLC and GlobeLand30)based on the harmonised FAO criterion,and quantified the relationships between four factors(i.e.,slope,elevation,field size and crop system)and cropland classification *** validation results indicated that MCD12Q1 and GlobeLand30 performed well in cropland classification regarding spatial consistency,with overall accuracies of 94.90 and 93.52%,*** FROMGLC showed the worst performance,with an overall accuracy of 83.17%.Overlaying the cropland generated by the four global LULC products,we found the proportions of complete agreement and disagreement were 15.51 and 44.72% for the cropland classification,*** consistency was mainly observed in the Northeast China Plain,the Huang-Huai-Hai Plain and the northern part of the Middle-lower Yangtze Plain,*** contrast,low consistency was detected primarily on the eastern edge of the northern and semiarid region,the Yunnan-Guizhou Plateau and southern *** size was the most important factor for mapping *** area accuracy,compared with China Statistical Yearbook data at the provincial scale,the accuracies of different products in descending order were:GlobeLand30,FROM-GLC,MCD12Q1,and *** cropland classification schemes mainly caused large area deviations among the four products,and they also resulted in the different ranks of spatial accuracy and area accuracy among the four *** results can provide valuable suggestions for selecting cropland products at the national or provinc

关键词： global LULC products cropland mapping accuracy evaluation food security China

Pretreatment with intestinal trefoil factor alleviates stress-induced gastric mucosal damage via Akt signaling

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第48期26卷 7619-7632页

作者： Yun Huang Meng-Meng Wang Zhi-Zhou Yang Yi Ren Wei Zhang Zhao-Rui Sun shi-nan Nie nantong Hospital Affiliated to nanjing University of Chinese Medicine Nantong 226001Jiangsu ProvinceChina Department of Emergency Medicine Jinling HospitalMedical School of Nanjing UniversityNanjing 210002Jiangsu ProvinceChina Department of Emergency Medicine Nanjing University of Chinese MedicineNanjing 210023Jiangsu ProvinceChina

BACKGROUND Stress-related gastric mucosal damage or ulcer remains an unsolved issue for critically ill *** ulcer prophylaxis has been part of routine intensive care,but uncertainty and controversy still ***-secreted with mucins,intestinal trefoil factor(ITF)is reported to promote restitution and regeneration of intestinal mucosal epithelium,although the mechanism remains *** To elucidate the protective effects of ITF on gastric mucosa and explore the possible *** We used a rat model of gastric mucosal damage induced by water immersion restraint stress and lipopolysaccharide-treated human gastric epithelial cell line to investigate the potential effects of ITF on damaged gastric mucosa both in vivo and in *** ITF promoted the proliferation and migration and inhibited necrosis of gastric mucosal epithelia in *** also preserved the integrity of gastric mucosa by upregulating expressions of occludin and zonula *** the rat model,pretreatment with ITF ameliorated the gastric mucosal epithelial damage and facilitated mucosal *** protective effects of ITF were confirmed to be exerted via activation of Akt signaling,and the specific inhibitor of Akt signaling LY249002 reversed the protective *** ITF might be a promising candidate for prevention and treatment of stressinduced gastric mucosal damage,and further studies should be undertaken to verify its clinical feasibility.

关键词： Intestinal trefoil factor Water immersion restraint stress Gastric mucosa Epithelium integrity Akt signaling pathway

Voidage correction method for DEM study of 3D pebble flows in a bed of cycloidal base

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PARTICUOLOGY 2024年第10期93卷 30-40页

作者： Xia, Zirui shi, Minglei Zou, Quan Gui, nan Yang, Xingtuan Tu, Jiyuan Jiang, Shengyao Tsinghua Univ Inst Nucl & New Energy Technol Collaborat Innovat Ctr Adv Nucl Energy Technol Key Lab Adv Reactor Engn & SafetyMinist Educ Beijing 100084 Peoples R China Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R China Tsinghua Univ Dept Automat Beijing 100084 Peoples R China RMIT Univ Sch Engn Melbourne Vic 3083 Australia

Voidage (porosity or void fraction) in packed particles (or pebbles) is of fundamental importance in calculating the pressure drop, obtaining the drag, predicting the bed permeability, estimating the neutron streaming, etc. For the case when particles are deformed, a method of voidage correction during the packing state is proposed using a Discrete Element Method (DEM) simulation of 3D pebble flow inside a bed of cycloidal base. A function to evaluate the remaining volume of a pebble intercepted by horizontal and vertical planes is proposed for voidage calculation. After that, the process of solving voidage distribution is provided in detail. Using this method, the voidage inside the cycloidal-base pebble bed is obtained to refer to reported similar data for validation. This method can be potentially used for dynamical voidage calculation in CFD-DEM simulation which can get suitable voidage distribution after the correction. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Voidage Pebble flow Packed bed Discrete element method Cycloidal base KD-Tree Volume correction RADIAL POROSITY GAS MODEL SIMULATION PACKINGS SPHERES

Alloy strategy to synthesize Pt-early transition metal oxide interfacial catalysts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

nano Research 2024年第4期17卷 3390-3397页

作者： shi-Long Xu Hang nan Wanqun Zhang Yue Lin Sheng-Qi Chu Hai-Wei Liang Hefei National Research Center for Physical Sciences at the Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei 230601China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Metal oxide supported metal catalysts show promising catalytic performance in many industry-relevant ***,the enhancement of performance is often limited by the insufficient metal/metal oxide *** this work,we demonstrate a general synthesis of Pt-early transition metal oxide(Pt-MO_(x),M=Ti,Zr,V,and Y)catalysts with rich interfacial sites,which is based on the air-induced surface segregation and oxidation of M in the supported Pt-M alloy *** characterizations verify the dynamic structural response of Pt-M alloy catalysts to air and the formation of Pt-MO_(x) catalysts with abundant interfacial *** prepared Pt-TiO_(x) interfacial catalysts exhibit improved performance in hydrogenation reactions of benzaldehyde,nitrobenzene,styrene,and furfural,as a result of the heterolytic dissociation of H_(2) at Pt-metal oxide interfacial sites.

关键词： Pt-early transition metal oxide interfacial catalyst alloy oxidation strategy interfacial sites hydrogenation reactions heterolytic dissociation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CdTe组件输出特性显式模型拟合规律

仪器仪表学报 2021年第7期42卷 208-215页

作者：师楠朱显辉黑龙江科技大学工程训练与基础实验中心哈尔滨150022 黑龙江科技大学电气与控制工程学院哈尔滨150022

为给出简单、准确的碲化镉(CdTe)光伏组件输出特性曲线显式模型,提出利用两条2阶Bezier函数轨迹分别拟合组件输出特性最大功率点左、右两侧曲线的思路,分析了控制点对Bezier函数的影响规律,明确了最优控制点的存在性,计算了7种不同厂家... 详细信息

为给出简单、准确的碲化镉(CdTe)光伏组件输出特性曲线显式模型,提出利用两条2阶Bezier函数轨迹分别拟合组件输出特性最大功率点左、右两侧曲线的思路,分析了控制点对Bezier函数的影响规律,明确了最优控制点的存在性,计算了7种不同厂家和型号CdTe组件最优控制点下的Bezier建模结果,利用相似三角形理论,找出了Bezier函数最优控制点位置与组件填充因子之间的拟合规律,建立了描述CdTe光伏组件输出特性的显式模型;最后,利用4种新CdTe组件对所提规律进行验证,并以迭代结果为基准和已有模型进行了对比分析。结果表明,基于Bezier函数的CdTe组件建模方法的平均相对误差在0.49%~1.5%之间,而现有模型的精度的平均相对误差在2.45%~9.19%之间,论证了所提模型的简单性和正确性。

关键词： CdTe组件特性曲线 Bezier函数控制点拟合规律

Characteristic of red eye related diseases of Han and Uygur population in Urumchi compared with Shanghai, China

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第7期15卷 1165-1173页

作者： Hui Zhao Yi Shao shi-nan Wu Li-Ying Tang Qi Zhang Chen Zhao Xue-Yi Chen Jing Fu Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200092China Department of Ophthalmology the First Affiliated Hospital of Nanchang UniversityJiangxi Province Ocular Disease Clinical Research CenterNanchang 330006Jiangxi ProvinceChina Eye Institute of Xiamen University Xiamen 361102Fujian ProvinceChina The First Affiliated Hospital of Xin Jiang Medical University Urumqi 830011Xinjiang Uygur Autonomous RegionChina

AIM: To study the characteristics, relative distribution and to compare causes of red eye in ophthalmic clinics in Urumchi and Shanghai, ***: Data on continuous cases of red-eye patients admitted to the Ophthalmology Center of Xinhua Hospital Affiliated to Shanghai Jiao Tong University and the First Affiliated Hospital of Xinjiang Medical University were collected between November 2018 and September 2019. Demographic data, the incidence of red eye and related disease distribution of all cases were obtained. The independent t-test method was used for age comparison, while the Chi-square test was used to compare classified data ***: The information on 335 and 415 patients with red eyes in Shanghai and Urumchi were collected, respectively. The main causes of red eye were conjunctival disease and dry eye. The age of female patients with red eyes was significantly higher than that of males, and the proportion of female patients with dry eyes was also ***-eye-related diseases occurred more frequently in patients over 46 years old than in those under 18, and dry eye was more common with increasing age. The incidence of infectious conjunctivitis in Urumchi was significantly higher than that in Shanghai, and allergic conjunctivitis occurred more frequently in spring, summer, or autumn than in winter(all P<0.05).CONCLUSION: Significant differences exist in the distribution of red-eye-related diseases in Urumchi and Shanghai regions of China, and distribution varies with age and season, the latter being an important feature of allergic conjunctivitis.

关键词： distribution red-eye-related diseases characteristic

Determination of Ge in Au alloys using sodium hypophosphite and potassium iodate potentiometric titration method

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 2020年第12期39卷 1492-1496页

作者： Shou-Li Han Xiao-Tang He Jun-Mei Guo Zhao-Ying Ren Li-Ya Zhu Liang-Wei Chen Qing-nan shi Jia-Hong Yi School of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Sino-Platinum Metals Resources(Yimen)Co.Ltd.Yimen651100China

This paper presents a new method of determining Ge in AuGe alloys by potassium iodate(KIO3)potentiometric titration when Ge(Ⅱ)and Au(0)are simultaneously reduced from Ge(Ⅳ)and Au(Ⅲ)by sodium hypophosphite rather than by distillation *** influences of such conditions as the reduction acidity,the dosage of sodium hypophosphite and the reduction time on the determination of Ge were *** in AuGe alloys such as AuGe_(12),AuGeNi_(12-2),AuAgGe_(18.8-12.5),and AuAgGeNi_(43.8-6-0.2)was measured with the relative standard deviation(RSD)of 0.10%-0.31%and the recoveries of added standard Ge in sample of 99.40%-100.40%under the conditions of 0.40-0.80 mol·L^(-1)HCl,3.3 mol·L^(-1)H^(3)PO^(4),15 g sodium hypophosphite,and reduction time of40 *** new method presented is of high accuracy in results,good stability and sensibility in end-point,and easy operation and strong selectivity of determination.

关键词： Ge determination AuGe alloy Sodium hypophosphite Potassium iodate Potentiometric titration

小麦骨干亲本周8425B抗条锈病优异基因在其衍生品种中的遗传解析

在线全文

学校读者我要写书评

暂无评论

作物学报 2024年第1期50卷 16-31页

作者：李俣佳许豪于士男唐建卫李巧云高艳郑继周董纯豪袁雨豪郑天存殷贵鸿河南农业大学农学院/省部共建小麦玉米作物学国家重点实验室/河南粮食作物协同创新中心/国家小麦工程技术研究中心河南郑州450046 河南丰德康种业股份有限公司河南郑州450001

周8425B是黄淮海麦区应用较广泛的矮秆大穗、抗病抗逆小麦骨干亲本,解析周8425B衍生品种的条锈病抗性遗传表现及其携带的抗条锈病基因遗传传递信息对新品种选用具有重要价值。本研究以条锈病强毒力生理小种条中34(CYR34)单一菌种对收集... 详细信息

周8425B是黄淮海麦区应用较广泛的矮秆大穗、抗病抗逆小麦骨干亲本,解析周8425B衍生品种的条锈病抗性遗传表现及其携带的抗条锈病基因遗传传递信息对新品种选用具有重要价值。本研究以条锈病强毒力生理小种条中34(CYR34)单一菌种对收集的222份周8425B衍生品种进行苗期条锈病抗性鉴定,以CYR34为主的混合菌种对衍生品种进行成株期条锈病抗性鉴定,利用周8425B携带的抗条锈病基因YrZH84、YrZH84.2、Yr30、YrZH22和Yr9紧密连锁的分子标记对衍生品种进行基因型检测。研究结果表明,周8425B苗期和成株期对目前强毒力优势菌种CYR34均表现高抗条锈病。在222份周8425B的衍生品种中,2年表现稳定成株期抗病的衍生品种有昌麦9号、济研麦10、百农4199、赛德麦7号和郑麦103等14份,占比6.3%;表现稳定全生育期抗病的衍生品种有周麦11、周麦22、周麦26、周麦36、兰天36、存麦16和郑品麦8号等52份,占比23.4%。周8425B衍生品种主要通过周麦11、周麦12、周麦13、周麦15、周麦16和周麦17等6个子一代再次衍生到子二代。子一代中周麦16和周麦13由于具有较好的农艺性状直接衍生出较多品种,周麦12与周麦13培育出子二代周麦22衍生出45个子三代,周麦11培育出矮抗58衍生出54个子三代。周8425B携带的YrZH84、YrZH84.2、YrZH22、Yr30和Yr9在衍生后代中的频率分别为34.7%、14.9%、41.9%、66.2%和67.1%。仅携带其中1个抗病基因的衍生品种以携带YrZH84的平均严重度最低,为15.4%;聚合2个抗病基因的衍生品种中,以携带YrZH84+YrZH22的平均严重度最低,为20.0%;聚合3个抗病基因的衍生品种中,以携带YrZH84+YrZH22+Yr9的平均严重度最低,为17.2%;聚合4个抗病基因的衍生品种中,携带YrZH84+YrZH22+Yr30+Yr9的平均严重度为16.9%,携带YrZH84.2+YrZH22+Yr30+Yr9的平均严重度为38.4%。苗期以携带全生育期抗性基因YrZH84或含有YrZH84的基因组合的衍生品种的抗病性较好。研究结果为中国小麦骨干种质周8425B的持续改良利用提供了条锈病基因信息,鉴定出对强毒力生理小种CYR34表现抗病的衍生新种质,为我国小麦抗条锈病遗传育种提供了参考。

关键词：小麦条锈病周8425B 抗条锈病基因遗传解析衍生系