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1046篇 您的检索式:作者名="Arnon"
    题名 作者 年代 出处 被引量
1单窗算法的大气参数估计方法显示文摘根据地表热辐射传导方程,提出了一个简单可行且精度较高的专门用于从TM6数据中演算地表温度的方法———单窗算法。这一算法把大气和地表状态对地表热传导的影响直接包括在演算公式中。该方法需要两个大气参数进行地表温度的演算,即大气平均作用温度和大气透射率。本文论述这两个大气参数的估计方法:根据大气水分含量或地表附近空气湿度来估计大气透射率;通过分析标准大气剖面资料,尤其是大气水分和气温随高程的变化规律,根据地表温度推算大气平均作用温度。覃志豪 LI Wenjuan ZHANG Minghua Arnon Karnieli Pedro Berliner 2003国土资源遥感2003,15,2:352
2用陆地卫星TM6数据演算地表温度的单窗算法显示文摘陆地卫星 TM数据 (TM6)热波段表示地表热辐射和地表温度变化。长期以来 ,从 TM6数据中演算地表温度通常是通过所谓大气校正法。这一方法需要估计大气热辐射和大气对地表热辐射传导的影响 ,计算过程很复杂 ,误差也较大 ,在实际中应用不多。根据地表热辐射传导方程 ,推导出一个简单易行并且精度较高的演算方法 ,把大气和地表的影响直接包括在演算公式中。该算法需要用地表辐射率、大气透射率和大气平均温度 3个参数进行地表温度的演算。验证表明 ,该方法的地表温度演算较高。当参数估计没有误差时 ,该方法的地表温度演算精度达到 <0 .4℃ ,在参数估计有适度误差时 ,演算精度仍达 <1 .1℃。因该方法适用于仅有一个热波段的遥感数据 ,故称为单窗算法。覃志豪 Zhang Minghua Arnon Karnieli Pedro Berliner 2001地理学报2001,56,4:816
3用NOAA-AVHRR热通道数据演算地表温度的劈窗算法显示文摘气象卫星NOAA -AVHRR有两个热通道用来监测地球表面温度。劈窗算法是用这两个热通道数据演算地表温度的最常用方法。近 10a来 ,国际遥感界已经提出了 10多种劈窗算法。本文主要介绍这些劈窗算法 ,并比较它们的演算精度 ,重点放在这些算法的具体计算方面 。覃志豪 ZHANG Ming-hua Arnon Karnieli 2001国土资源遥感2001,13,2:122
4基于灰度关联-岭回归的荒漠土壤有机质含量高光谱估算显示文摘为改善高光谱技术对荒漠土壤有机质的估测效果,该文采集了以色列Seder Boker地区的荒漠土壤,经预处理、理化分析后将土样分为砂质土和黏壤土2类,再通过光谱采集、处理得到6种光谱指标:反射率(reflectivity,REF)、倒数之对数变换(inverse-log reflectance,LR)、去包络线处理(continuum removal,CR)、标准正态变量变换(standard normal variable reflectance,SNV)、一阶微分变换(first order differential reflectance,FDR)和二阶微分变换(second order differential reflectance,SDR)。通过灰度关联(gray correlation,GC)法确定SNV、FDR、SDR为敏感光谱指标,采用偏最小二乘回归(partial least squares regression,PLSR)法和岭回归(ridge regression,RR)法,构建基于敏感光谱指标的土壤有机质高光谱反演模型,并对模型精度进行比较。结果表明:砂质土有机质含量的反演效果要优于黏壤土;基于SNV指标建立的模型决定系数R^2和相对分析误差RPD均为最高、均方根误差RMSE最低,所以SNV是土壤有机质的最佳光谱反演指标;对SNV-PLSR模型和SNV-RR模型综合比较得出,SNV-RR模型仅用全谱4%左右的波段建模,实现了更为理想的反演效果:其中,对砂质土有机质的预测能力极强(R_p^2为0.866,RMSE为0.610 g/kg、RPD为2.72),对黏壤土有机质的预测能力很好(Rp2为0.863,RMSE为0.898 g/kg、RPD为2.37)。荒漠土壤有机质GC-SNV-RR反演模型的建立为高光谱模型的优化、土壤有机质的快速测定提供了一种新的途径。王海峰 张智韬 Arnon Karnieli 陈俊英 韩文霆 2018农业工程学报2018,34,14:37
5基于岭回归的土壤含水率高光谱反演研究显示文摘以以色列南部Seder Boker地区采集的粘壤土样品为研究对象。在室内利用ASD Field Spec 3型高光谱仪获取土壤的原始光谱,在进行数据预处理和不同数学变换后,共获取了4种光谱指标:光谱反射率(REF)、倒数之对数(LR)、一阶微分(FDR)和去包络线(CR)。采用偏最小二乘回归法(PLSR)、逐步回归法(SR)和岭回归法(RR)构建了基于不同指标的土壤含水率高光谱反演模型,并对反演结果进行精度验证与比较。结果表明:REF-PLSR模型在所有回归模型中的反演与预测效果均为最优(R2c=0.990,R2p=0.987),在逐步回归模型和岭回归模型中,LR-SR(R2c=0.981,R2p=0.971)、LR-RR(R2c=0.975,R2p=0.979)均为最佳模型。对于其他3种指标,虽然逐步回归法和岭回归法的建模效果较偏最小二乘回归法略有下降,但R2c均大于0.9,R2p均大于0.8,RPD均大于2.5,RMSE均小于0.03,模型仍具有较好的反演效果;逐步回归法和岭回归法均实现了模型的简化,但岭回归法采用有偏估计从而提高了模型的稳健性,且实现了波段的优选(用于建模的波段数仅为全光谱的0.3%)。粘壤土土壤含水率LR-RR高光谱反演模型的建立为高光谱模型的优化、土壤含水率的快速测定提供了途径。张智韬 王海峰 KARNIELI Arnon 陈俊英 韩文霆 2018农业机械学报2018,49,5:29
6基于FOD和SVMDA-RF的土壤有机质含量高光谱预测显示文摘为探讨分数阶微分(FOD)联合支持向量机分类-随机森林模型改善高光谱监测荒漠土壤有机质含量(SOM)的效果,对以色列Sde Boker荒漠地区采集的砂质土(SS)和黏壤土(CLS)样品进行理化分析和室内光谱测定,依据光谱的平均反射率建立支持向量机分类模型(SVMAD),并对不同土质高光谱原始反射率分别经0^2阶(间隔0.2)的分数阶微分处理,构建归一化光谱指数(NDI),分析NDI和SOM之间的二维相关性,并筛选敏感的NDI指数,以此建立不同FOD的随机森林(RF)模型,并以不同土质中的最佳模型进行组合,构建新的SVMDA-RF模型。结果表明:基于光谱平均反射率的SVMDA对土壤质地的分类正确率可达100%;分数阶微分耦合光谱指数具有放大波长间与SOM有关隐含信息的能力,经FOD提升敏感指数的数量在0.6阶时达到峰值,但黏壤土的敏感指数数量远大于沙质土;由不同FOD敏感指数建立的RF模型中,砂质土在1.2阶的模型最佳(RC^2=0.962,RP^2=0.920,RMSEP为0.435 g/kg,RPD为3.658),黏壤土在0.6阶的模型最佳(RC^2=0.942,RP^2=0.944,RMSEP为0.554 g/kg,RPD为4.316);经最佳模型组合后的SVMDA-RF模型,砂质土和黏壤土的模型精度都有所提高,其中RC^2=0.980,RP^2=0.979,RMSEP为0.481 g/kg,RPD为7.004。研究成果可为快速评估荒漠土壤有机质含量提供依据。张智韬 劳聪聪 王海峰 ARNON Karnieli 陈俊英 李宇 2020农业机械学报2020,51,1:20
7基于PLS-BPNN算法的土壤速效磷高光谱回归预测方法显示文摘土壤速效磷是影响作物生长发育的重要养分指标。光谱分析技术对速效磷的定量预测具有较好的应用前景,高光谱带宽窄、分辨率高,但存在数据冗余和共线性等问题。本文针对皖北砂姜黑土145个样本开展研究,提出了利用偏最小二乘回归算法(PLS-R)对土壤可见近红外高光谱数据(400~1 000 nm)进行数据降维和特征提取,根据交叉验证和变量投影重要性分别得到潜在变量和特征波长;再分别输入BP神经网络(BPNN)进行训练,得到回归分析模型对速效磷进行定量预测。结果表明:与利用全部波长数据建模的预测结果(校正集和验证集的相对分析误差M_(RPD)分别为10.27和2.09)相比,利用9个特征波长建立的回归模型校正集M_(RPD)为2.66,预测精度明显降低,而验证集M_(RPD)为2.05,近似达到利用全部波长数据建模的预测效果;利用5个潜在变量建立回归模型,校正集和验证集的M_(RPD)分别为3.10和2.29,其中验证集相对于全部波长建模的预测精度提高了9.6%。因此,基于PLS-BPNN算法进行回归建模可以有效降低高光谱数据冗余和共线性的影响,提高模型的泛化能力,且利用潜在变量进行回归建模能提高模型预测精度。齐海军 李绍稳 KARNIELI Arnon 金秀 王文才 2018农业机械学报2018,49,2:13
8Y-梯度广义最小二乘加权校正的土壤速效氮野外原位光谱预测显示文摘土壤速效氮是影响作物生长发育的重要养分指标。野外原位可见近红外光谱(VIS-NIR)分析技术具有快速无损等特点,对速效氮的定量预测具有较好的应用前景。野外条件下进行原位光谱采集更节省人力物力,且为土壤养分实时传感器的开发提供了数据基础。但由于野外原位光谱中通常存在大量的无关环境因子干扰信息,易导致回归模型预测精度降低,达不到实用要求。针对位于以色列中部和北部的两个试验点共76个样本开展研究,提出利用Y-梯度广义最小二乘加权算法(Y-GLSW)对样本的野外原位VIS-NIR反射率光谱(350~2 500nm)进行滤波校正,以提高回归模型的预测能力。首先使用SG平滑、一阶导数变换、标准正态变换等常规方法对原始光谱进行预处理和变换;在此基础上再使用Y-GLSW构建滤波模型对变换后的光谱进行滤波校正;最后使用偏最小二乘回归算法(PLS-R)分别结合原始光谱RW、预处理变换后的光谱PPT和滤波校正后的光谱Y-GLSW建立回归分析模型对速效氮进行定量预测。结果表明:利用RW光谱建立的回归预测模型是不可靠的;利用PPT光谱建立的回归模型在测试集的相对分析误差(RPD)为1.41,解释总方差占实际总方差之比(SSR/SST)为0.57,模型具有一定的可靠性;Y-GLSW光谱建立的回归模型在测试集的RPD和SSR/SST分别为2.07和0.69,相对于PPT模型分别提高了46.81%和21.05%。因此,利用Y-GLSW对野外原位VIS-NIR光谱进行滤波校正,能够有效去除光谱中的无关信息数据,提高模型的预测精度和解释能力。齐海军 Karnieli Arnon 李绍稳 2018光谱学与光谱分析2018,38,1:7
9Comparative analysis of the predictive power of different endothelial progenitor cell phenotypes on cardiovascular outcome显示文摘AIM: To compare the predictive power of different endothelial progenitor cell (EPC) phenotypic markers for future cardiovascular events. METHODS: Peripheral blood was collected from 76 consecutive patients with acute coronary syndromes (ACS) who underwent percutaneous coronary intervention in our institute. The various EPC phenotypes of peripheral blood mononuclear cells were CD34+CD133+, CD34+KDR+, and CD 133+KDR+. The outcome endpoint included cardiovascular mortality, recurrent ACS, and hospitalization for decompensated heart failure during a 24-mo follow-up period.RESULTS: CD34+CD133+ cells (P = 0.034), but not CD34+KDR+ (P = 0.35) or CD 133+KDR+ cells (P = 0.19), were found to predict recurrent ACS. We found no correlation between EPCs measured by any of the three phenotypic combinations of accepted CD markers and the total combination of these separate outcomes. CONCLUSION: The EPC CD34+CD133+ phenotype, but not the CD34+KDR+ or the CD 133+KDR+ phenotypes, is predictive of future adverse cardiovascular outcomes.Shmuel Schwartzenberg Arnon Afek Gideon Charach Ardon Rubinstein Yossi Ben-Shoshan Sarina Kissil Sofia Maisel-Auslender Gad Keren Jacob George 2010World Journal of Cardiology2010,2,9:5
10Esophageal obstruction due to enteral feed bezoar:A case report and literature review显示文摘This paper describes a rare complication of enteral feeding,esophageal obstruction due to feeding formula bezoar,and reviews the published cases. An attempt to re-insert the nasogastric tube in a chronically ventilated 80-year-old female fed via a nasogastric tube with Jevity failed. An esophagogastroduodenoscopy revealed an 18 cm-long concretion of the feeding formula,fi-lling most of the esophageal lumen,which was removed endo scopically. Forty-two cases of feeding formula esophageal bezoars have been reported in the literature. The formation of feeding formula bezoars is triggered by acidic gastroesophageal reflux. The acidic pH in the esophagus causes clotting of the casein in the formula. Predisposing factors for bezoar formation are:mechanical ventilation,supine position,neurological diseases,diabetes mellitus,hypothyroidism,obesity and history of partial gastrectomy. Diagnosis and removal of the bezoar is done endoscopically. Feeding in a semi-recumbent position,administration of prokinetic agents and proton pump inhibitors may prevent this complication.Esther-Lee Marcus Ron Arnon Arkadiy Sheynkman Yehezkel G Caine Joseph Lysy 2010World Journal of Gastrointestinal Endoscopy2010,2,10:3
11Sequential capsule endoscopy of the small bowel for follow-up of patients with known Crohn’s disease显示文摘Eva Niv Sigal Fishman Helena Kachman Ruth Arnon Iris Dotan 2014Journal of Crohn’s and Colitis2014,,:3
12Evolved to adapt: A computational approach to animal innovation and creativity显示文摘Oren KOLODNY Shimon EDELMAN Arnon LOTEM 2015Current Zoology2015,61,2:2
13Copper enzymes in isolated chloroplast:polyphemol oxidase in Beta vulgaris显示文摘Arnon D I 1949Plant Physl1949,24,:2
14Copper Enzymes in Isolated Chloroplasts Polyphenloxidase in Bera Vulgaris 显示文摘Arnon D J 1949Plant Physiol1949,24,:2
15Motivation dimensions for running a marathon:A new model emerging from the Motivation of Marathon Scale(MOMS)显示文摘Purpose:The aim of this study was to test and expand the Motivation of Marathoners Scale(MOMS) model(Masters et al.,1993).Methods:The MOMS questionnaire was distributed to 306 male and female marathon runners(age range:20–77 years) with experience in marathon running(range:1–44 runs).A confirmatory factor analysis(CFA) revealed that the original model failed to fit the data.Hence,exploratory factor analysis(EFA) was performed to test the best factorial solution for the current data,and a subsequent CFA was performed on the revised factorial structure.Then,a series of EFAs using maximum likelihood factor extraction method were performed.Results:The best structure solution for model-data fit resulted in 11 factors:psychological coping—emotional-related coping,psychological coping—everyday-life management,life meaning,self-esteem,recognition,affiliation,weight concerns,general health orientation—reduced disease prevalence and longevity,general health orientation—keep fit,competition,and personal goal achievement.Conclusion:This study provides a sound and solid framework for studying motivation for physically demanding tasks such as marathon runs,and needs to be similarly applied and tested in studies incorporating physical tasks which vary in mental demands.Sima Zach Yan Xia Aviva Zeev Michal Arnon Noa Choresh Gershon Tenenbaum 2017Journal of Sport and Health Science2017,6,3:2
16Parental acceptability of the watchful waiting approach in pediatric acute otitis media显示文摘AIM: To determine parental knowledge about acute otitis media(AOM) and its antibiotic therapy, antibiotic resistance and the willingness to comply with the watchful waiting(WW) approach in primary care settings in southern Israel.METHODS: The study was conducted in 3 primary care clinics and the pediatric emergency room of Soroka University Medical Center. Questionnaires(20 questions on education background, previous AOM experience, knowledge on antimicrobial resistance and attitude vs the WW approach) were filled by 600 parents(150 at each centers) of children < 6 years of age.RESULTS: Mothers represented 69% of parents; 2% had an education of < 10 school years, 46% had high-school education and 17% had an academic degree. 69% parents reported previous experience with AOM and 56% thought that antibiotics represent the only treatment for AOM. Knowledge on bacterial resistance to antibiotics was reported by 57% of the parents; 86% parents were willing to accept/probably accept the WW approach for their children. Logistic regression analysis revealed a significant association between parental education and knowledge about bacterial resistance to antibiotics and that previous experience with AOM was significantly associated with reluctance to accept the WW approach. More parents with knowledge on bacterial resistance were willing to accept the WW approach compared with parents without such knowledge. No correlation was found between the education level and willingness to accept the WW approach. CONCLUSION: A significant correlation was found between previous parental education and experience with AOM and the knowledge about antibiotic use, bacterial resistance and acceptance of the WW approach.Arnon Broides Olga Bereza Noga Lavi-Givon Yariv Fruchtman Eli Gazala Eugene Leibovitz 2016World Journal of Clinical Pediatrics2016,5,2:2
17Anomaly Detection Based on an Iterative Local Statis-ticals Approach显示文摘 2004IEEE Signal Processing2004,84,7:1
18Acremine G, dimeric metabolite from cultures of Acremonium byssoides A20显示文摘Arnone A Nasini G Panzeri W 2008Journal of Natural Products2008,71,1:1
19BjaIT:a novel scorpion al pha-toxin selective for insects unique pharmacological tool显示文摘Arnon T Potikha T Sher D 2005Insect Biochemistry and Molecular Biology2005,35,3:1
20PD-1 ligands, negative regalatons for activation of naive, memory, and recently activated human CD4^+ T cells显示文摘Guifang C Arnon K Enedina ML 2004Cell Immunol2004,230,2:1
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