不同水肥优化模式下冬小麦叶片生长及群体光分布研究   总被引：2，自引：0，他引：2  

李志勇  郭予琦  王璞  Marion Boening-Zilkens  W.Claupein 《河南科技学院学报》2003,31(2):8-12

试验结果表明,与传统水肥相比较,传统灌溉-优化施肥冬小麦主茎上四叶叶片短小叶面积减少,叶片相对较厚,叶倾角大,株型紧凑,消光系数小,冠层各层透光率较高;优化灌溉-传统施肥冬小麦主茎上四叶叶片变长叶面积增加,叶片相对较薄,叶倾角小,株型较为披散,消光系数大,冠层各层透光率较低;优化水肥及秸秆还田优化水肥冬小麦主茎上四叶叶面积略微减少,叶片厚度、叶倾角、消光系数及各层透光率与传统水肥差异很小,株型较好;各处理间经济产量无显著性差异.  相似文献   

Parenting of Divorced Mothers as a Link between Social Status and Boys' Academic Outcomes: Unpacking the Effects of Socioeconomic Status   总被引：1，自引：0，他引：1  

David S. DeGarmo  Marion S. Forgatch  & Charles R. Martinez  Jr. 《Child development》1999,70(5):1231-1245

Socialization theories posit parenting practices as mechanisms linking socioeconomic status (SES) and children's academic outcomes. A mediational parenting model was tested examining separate effects of maternal education, occupation, and income for a sample of 238 divorced or recently separated mothers of 6- to 9-year-old sons. For the SEM path models, each indicator of SES was associated with better parenting, and parenting in turn had indirect effects on achievement through home skill-building activities and school behavior. The direct effect of maternal education on achievement was mediated by home skill-building activities, the direct effect of maternal occupation on achievement was not mediated, and income measures had no direct effects on achievement. These findings underscore the importance of unpacking the effects of SES and the relevance of effective parenting practices as a protective factor in the home and school environment for young boys' school success during postdivorce adjustment.  相似文献   

The effectiveness of a mass screening procedure in an early intervention program     

Daniel S. Kirschenbaum  Marion E. Marsh  Joyce B. Devoge 《Psychology in the schools》1977,14(4):400-406

The effectiveness of a mass screening procedure was examined within the context of a preventively oriented school-based treatment program. Mass screening consisted primarily of teachers rating the frequency of all primary grade children's acting-out, moody-withdrawn, and learning problem behaviors. While teachers directly referred 6.9% (n = 48) of the primary grade population of three inner-city schools (n = 698), mass screening subsequently identified an additional 9.7% (n = 68) of this population. Furthermore, both referred and screened-in groups were rated by teachers on the Child Activity Rating Scale (CARS) as behaving much less adaptively relative to a normative group (n = 285; ps < .001). As expected, the referred children evidenced greatest overall dysfunctioning with most pronounced acting-out and learning problems according to ratings by teachers. In addition, further evidence of the validity of the CARS rating form was demonstrated by the agreement between staff predictions of CARS scores and actual ratings by teachers. The mass screening procedure employed is discussed as an effective procedure and suggestions are offered which could increase its utility.  相似文献   

Assay validity of point-of-care platelet function tests in thrombocytopenic blood samples     

Conrad Lacom  Alexander Tolios  Markus W. Lffler  Beate Eichelberger  Peter Quehenberger  Eva Schaden  Marion Wiegele 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2022,32(2)

IntroductionPoint-of-care (POC) platelet function tests are faster and easier to perform than in-depth assessment by flow cytometry. At low platelet counts, however, POC tests are prone to assess platelet function incorrectly. Lower limits of platelet count required to obtain valid test results were defined and a testing method to facilitate comparability between different tests was established.Materials and methodsWe assessed platelet function in whole blood samples of healthy volunteers at decreasing platelet counts (> 100, 80-100, 50-80, 30-50 and < 30 x10⁹/L) using two POC tests: impedance aggregometry and in-vitro bleeding time. Flow cytometry served as the gold standard. The number of platelets needed to reach 50% of the maximum function (ED₅₀) and the lower reference limit (ED_ref) were calculated to define limits of test validity.ResultsThe minimal platelet count required for reliable test results was 100 x10⁹/L for impedance aggregometry and in-vitro bleeding time but only 30 x10⁹/L for flow cytometry. Comparison of ED₅₀ and ED_ref showed significantly lower values for flow cytometry than either POC test (P value < 0.05) but no difference between POC tests nor between the used platelet agonists within a test method.ConclusionCalculating the ED₅₀ and ED_ref provides an effective way to compare values from different platelet function assays. Flow cytometry enables correct platelet function testing as long as platelet count is > 30 x10⁹/L whereas impedance aggregometry and in-vitro bleeding time are inconsistent unless platelet count is > 100 x10⁹/L.  相似文献   

Conflict in the Dyadic Play of 3-Year-Old Children     

Marion O'Brien  Carolyn Roy  Anne Jacobs  Mery Macaluso  Vicki Peyton 《Early education and development》1999,10(3):289-313

Episodes of conflict provide a rich source of information about children's development of interactive skills. In the present study, 184 3-year-old children were observed in dyadic play and the 287 conflicts that occurred during their play were transcribed and coded. In general, children's conflicts arose in the context of ongoing play and were brief, lasting less than 15 seconds. Most disputes concerned toy possession, and almost 80% were ended by the simple withdrawal of one or the other children from the conflict. When children responded with emotional intensity to conflict, their conflicts lasted longer and were more likely to be followed by continued negative interaction. Individual difference data were available for one member of each dyad observed in play. Children rated in infancy as having difficult temperaments were found to be more intense during conflict, to spend more time in conflict, and to score higher on an index of conflict resolution competence, whereas concurrent social behavior was not related to conflict variables. Girls scored higher than boys on competence at conflict resolution, and children with better language skills spent less time in conflict. The more time children spent in nonmaternal child care up to age 3, the less likely they were to initiate conflict.  相似文献   

Residual force enhancement due to active muscle lengthening allows similar reductions in neuromuscular activation during position- and force-control tasks     

Rhiannon Marion  Geoffrey A. Power 《运动与健康科学(英文)》2020,9(6):670-676

BackgroundResidual torque enhancement (rTE) is the increase in torque observed during the isometric steady state following active muscle lengthening when compared with a fixed-end isometric contraction at the same muscle length and level of neuromuscular activation. In the rTE state, owing to an elevated contribution of passive force to total force production, less active force is required, and there is a subsequent reduction in activation. In vivo studies of rTE reporting an activation reduction are often performed using a dynamometer, where participants contract against a rigid restraint, resisting a torque motor. rTE has yet to be investigated during a position task, which involves the displacement of an inertial load with positional control.MethodsA total of 12 participants (6 males, 6 females; age = 22.8 ± 1.1 years, height = 174.7 ± 8.6 cm, mass = 82.1 ± 37.7 kg; mean ± SD) completed torque- and position-matching tasks at 60% maximum voluntary contraction for a fixed-end isometric contraction and an isometric contraction following active lengthening of the ankle dorsiflexors.ResultsThere were no significant differences in activation between torque- and position-matching tasks (p = 0.743), with ∼27% activation reduction following active lengthening for both task types (p < 0.001).ConclusionThese results indicate that rTE is a feature of voluntary, position-controlled contractions. These findings support and extend previous findings of isometric torque-control conditions to position-controlled contractions that represent different tasks of daily living.  相似文献   

The Development and Implementation of a Prenatal Education Program for Expectant Parents of Multiples     

Joan Esper Kuhnly  Marion Juliano  Patricia Swider McLarney 《The Journal of perinatal education》2015,24(2):110-118

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Restoration     

Marion MacDonald Neve 《The Educational forum》2013,77(2)

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Once in a While     

Marion Canby 《The Educational forum》2013,77(1)

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FROM NEAR‐RUBBLE TO REBIRTH: A FORMER CHURCH BUILDING AS A CENTERPIECE OF COLLABORATION FOR CHILDREN     

Claity Massey  James Ernest  Marion Barnett  Julie Henry 《Journal of Early Childhood Teacher Education》2013,34(1):75-84

This article describes the collaborative efforts of multiple organizations and individuals in transforming a doomed church in a large urban community into an exemplary public Pre‐k through Grade 2 laboratory school. Central to this emerging facility was the commitment of all cooperating parties to focus upon meeting the educational, health, and social needs of each child through school, home and community involvement. Unique to this collaboration has been the continual involvement of higher education institutions in Western New York in the planning, organization and implementation of this project. Further, infusion of the latest in computer and video technology with distance learning capability supported cross‐fertilization and friendships among higher education professionals and their students from a variety of related disciplines.  相似文献