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Recently, extremely large benzenoid hydrocarbons have been synthesized. These compounds resemble graphite in many ways, and
have been named graphenes. Because of their nonstandard properties, graphenes have already found numerous applications, especially
as special-purpose materials in electronics. In this article we outline the basic chemical facts on graphenes. 相似文献
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Shaul SHALVI Matthijs BAAS Michel J. J. HANDGRAAF Carsten K.W. DE DREU 《Learned Publishing》2010,23(2):117-123
At a top psychology journal, Psychological Science (PS), submissions peak during the summer months. We tested whether this seasonal submission bias decreases the likelihood of a paper being accepted in that period. Month of submission data was obtained for all 575 publications in PS for the period 2003–2006. Whereas submissions to PS were higher in the summer, there was no evidence that most accepted publications were originally submitted in the summer. Thus, contributors submit to PS when the likelihood of acceptance is the lowest – creating their own entrance barrier. A similar seasonal pattern was not identified for Personality and Social Psychology Bulletin, another top psychology journal. Using the Web of Knowledge database, we further assessed whether overcoming the seasonal entrance barrier influences the number of citations a paper receives in subsequent years. We discuss the possibility that the different rejections policies in the two journals, employing desk rejections or not, may explain this discrepancy, and explore a range of alternative hypotheses. 相似文献
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Shelley Shaul 《Reading and writing》2012,25(5):1143-1170
This study examined the differences in processing between regular and dyslexic readers in a lexical decision task in different
visual field presentations (left, right, and center). The research utilized behavioral measures that provide information on
accuracy and reaction time and electro-physiological measures that permit the examination of brain activity during cognitive
processing. Two groups of university students, regular and dyslexic readers, were matched on age, gender, intelligence, socioeconomic
status, and handedness. A lexical decision task was used in order to examine the processes during word recognition. Subjects
were required to decide whether a sequence of letters constituted a real word existing in spoken language or whether the stimulus
seen was not an accurate word. For the behavioral measures, it was found that the dyslexics read slower and with more errors
than the regular readers. Moreover, the ERP components appeared later in dyslexics as compared to regular readers in this
task. The performance of the dyslexics improved and even approached that of the regular readers when the stimuli were presented
to the left visual field. Thus, it seems that the dyslexics were relying more on their right hemisphere for linguistic processing,
whereas the regular readers were relying more on their language areas in the left hemisphere. 相似文献
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Which equipment should be bought for a given sum to increase the profit of an industrial enterprize with a known specification of production within given limits? This problem is described as a large-scale linear program (LP) of a specific structure. An effective preliminary analysis for this structure was proposed in Ioslovich and Makarenkov [On methods of dimensionality reduction in linear programming, Econ. Math. Methods Moscow (in Russian) 11(3) (1975) 316-324] which aimed to reduce the size of the problem by detection of the redundant and active constraints. In this paper a robust system is considered, dealing with box-constrained uncertainties in the input coefficients. The analysis is based on robust evaluations of bounds for primal and dual constraints. A robust evaluation of uncertain duals presented in [I. Ioslovich, P.-O. Gutman, Robust redundancy determination and evaluation of the dual variables of linear programming problems in the presence of uncertainty, 1, in, V. Kucera, M. Sebek (Eds.), Proceedings of 3rd IFAC Symposium on Robust Control Design (ROCOND 2000), IFAC, Prague, Czech Republic, Elsevier Science, Amsterdam, 2000, paper 115] is essentially used. 相似文献
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Enabling pre-service teachers to develop a critical view of their practice and to acquire the higher order inquiry skills necessary for pedagogic research has been and continues to be a challenge. The present study presents a unique intervention in the training of pre-service teachers in research literacy (RL) skills using a Problem Based Learning (PBL) approach. The intervention is implemented in two different Learning Communities (LC), one online and the other blended. Both immediate and long-term effects of PBL are investigated as are the effects of social and direct scaffolding within the LCs. The study focuses on transmitting the following RL skills: identifying and defining a problem, formulating a research question, and designing a research method. The findings indicate an immediate effect upon all RL skills in both LCs. The long-term effect appears only in the online LC and only for two RL skills: identifying and defining problems. Additionally, there is greater use of social scaffolding in formulating and designing a research study in the online LC than in the blended learning community. Those findings are then interpreted in terms of retention capacity and scaffolding in blended and online LCs. 相似文献
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We restrict the discussion of root clustering (exclusion) to rational convex regions. A region in this family is constructed as the intersection of an infinite number of half planes. The root clustering criterion involves the positivity of a set of polynomials with respect to the region's parameter. 相似文献
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This study tested the equivalence of a theoretical model of parenting behaviors linking financial strain to adolescents' achievement for African American and European American families and for single- and two-parent families. The sample included an economic cross-section of African American (n = 387) and European American families (n = 230) from single- (n = 171) and two-parent (n = 446) homes. Multi-group analyses revealed no significant differences in the structural equation models between the African American and European American families, or between the single- and two-parent families. Results demonstrated that negative parent-adolescent relationships and parental school involvement mediated the relation between financial strain and adolescents' academic achievement. 相似文献