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259篇 您的检索式:作者名="Dooren"
    题名 作者 年代 出处 被引量
1五年级小学生数学问题提出能力和观念的调查研究显示文摘近几年来,数学问题提出日益受到学者们的重视,然而中国小学生数学问题提出能力与观念之间关系的研究不是很深入,特别是数学问题提出能力的测量缺乏有效的评价指标.因此,构建一个有效的数学问题提出能力的评价体系,并在此基础上探究小学生数学问题提出能力和观念之间的关系就显得尤为重要.对辽宁省117名五年级小学生数学问题提出能力和观念的情况,及其二者之间的关系进行调查.调查结果表明:首先,大部分学生都能够提出正确的数学问题,而提出创新性的,复杂程度高的数学问题存在困难.同时,学生对学好数学问题提出,缺乏一定的信心.其次,学生的数学问题提出能力和观念之间存在较高的相关性.陈丽敏 景敏 Verschaffel Lieven Van Dooren Wim 2013数学教育学报2013,22,2:17
2No evidence for a genetic association between female mating preference and male secondary sexual trait in a Lake Victoria cichlid fish显示文摘Sexual selection by female mating preference for male nuptial coloration has been suggested as a driving force in therapid speciation of Lake Victoria cichlid fish. This process could have been facilitated or accelerated by genetic associations betweenfemale preference loci and male coloration loci. Preferences, as well as coloration, are heritable traits and are probably determinedby more than one gene. However, little is known about potential genetic associations between these traits. In turbid water,we found a population that is variable in male nuptial coloration from blue to yellow to red. Males at the extreme ends of thephenotype distribution resemble a reproductively isolated species pair in clear water that has diverged into one species withblue-grey males and one species with bright red males. Females of the turbid water population vary in mating preference coincidingwith the male phenotype distribution. For the current study, these females were mated to blue males. We measured the colorationof the sires and male offspring. Parents-offspring regression showed that the sires did not affect male offspring coloration,which confirms earlier findings that the blue species breeds true. In contrast, male offspring coloration was determined by theidentity of the dams, which suggests that there is heritable variation in male color genes between females. However, we found thatmating preferences of the dams were not correlated with male offspring coloration. Thus, there is no evidence for strong geneticlinkage between mating preference and the preferred trait in thisInke van der SLUIJS Ole SEEHAUSEN Tom J.M.Van DOOREN Jacques J.M.van ALPHEN 2010Current Zoology2010,56,1:3
3Mitochondrial Reactive Oxygen Species and Risk of Atherosclerosis显示文摘Maarten Hulsmans Els Dooren Paul Holvoet 2012Current Atherosclerosis Reports2012,,3:2
4Robust Stability and Stabilization for Singular Systems with State Delay and Parameter Uncertainty 显示文摘Xu S Dooren P 2002IEEE Trans Automat Control2002,47,7:1
5Corneal endothelial cell density after trypan blue capsule staining in cstaract surgery显示文摘Dooren Van BT Waard PW Poort-van Nouhuys 2002J Cataract Refract Surg2002,28,4:1
6Numerical Aspects of DifferentKalman Filter Implementations 显示文摘Verhaegen M Van Dooren P 1986IEEE Transactions onAutomatic Control1986,,31:1
7Robust stability and stabilization for singular systems with state delay and parameter uncertainty显示文摘Xu S Y Dooren P V Stefen R 2002IEEE Transactions on Automatic Control2002,7,7:1
8Endothelial cell density after posterior lamellar keratoplasty (Melles techniques):3 years follow-up显示文摘Van Dooren B Mulder PG Nieuwendaal CP 2004J Ophthalmol2004,138,2:1
9Robust stability and stabilization for singular systems with state delay and parameter uncertainty 显示文摘Xu S Y Van Dooren P Stefan R 2002IEEE Transactions on Automatic Costrol2002,47,7:1
10Preliminary clinical results of posterior lamellar keratoplasty through a sclerocorneal pocket incision显示文摘Melles GRJ Lander F van Dooren BTH 2000Ophthalmology2000,107,:1
11Robust stability and stabilization for singular systems with state and parameter uncertainty显示文摘Xu S Van Dooren P Stefan R 0,,07:1
12Robust Stability and Stabilization for Singular Systems with State Delay and Parameter Uncertainty显示文摘XU Sheng-yuan Dooren P Van Stefan R 2002IEEE Trans on Automatic Control2002,47,7:1
13Robust stability and stabilization for singular system s with state delay and parameter uncertainty显示文摘XU S Y DOOREN P V STEFAN R 2002IEEE Transactions onAautomatic Control2002,47,7:1
14Robust stability and stabilization for singular systems with state delay and parameter uncertainty 显示文摘Xu s Y Dooren P V Stefen R 2002IEEE Trans Automat Contr2002,47,7:1
15Robust stability and stabilization for singular systems with state delay and parameter uncertainty显示文摘XU S DOOREN P V STEFAN R 2002IEEE Transactions on Automatic Control2002,47,7:1
16Robust pole assignment in linear state feedback 显示文摘Kautslcy J Nichols N K Van Dooren P 1985International J of Control1985,41,5:1
17Robust stubility and stabilization for singular systems with state delay and parameter uncertainty显示文摘Xu S Y Dooren P Stefan R 2002IEEE Trans Aurora Control2002,47,:1
18Robust pole assignment in linear state feedback 显示文摘KAUTSKY J NICHOLS N K VAN DOOREN P 1985Int J Control1985,41,5:1
19Chebyshev Technique for Solving Nonlinear Control Problems显示文摘VIASSENBROECK J DOOREN RV 1988IEEE Transaction on Automatic Control1988,33,4:1
20A continuation algorithm for discovering new chaotic motions in forced Duffing systems显示文摘DOOREN R V JANSSEN H 0,,03:1
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