This multivariate study investigated whether Parental Support, Teacher Support, and Academic Motivation mediate the relationship between Parental Status （i.e., children from single or both parents homes） and Academi...This multivariate study investigated whether Parental Support, Teacher Support, and Academic Motivation mediate the relationship between Parental Status （i.e., children from single or both parents homes） and Academic Performance, The research design used for the study was a cross sectional survey using the quantitative approach. Data set from 250 primary school pupils from the Effutu Municipality were analysed using partial correlation and multiple regression analytical techniques. Among the study findings, that were when the effects of Parental Status were controlled for, Parental Support, Teacher Support, and Academic Motivation still related significantly to Academic Performance. Among the conclusions of the findings are that, whether the child was from a single or both parent home was not important with regard to his or her academic performance but rather it was the quality of support that the child gets from whoever is doing the parenting, teacher support and the child＇s own academic motivation that were important to determine the child＇s Academic Performance. The study also found that Parental Support was the best predictor of the pupils＇ Academic Performance out of the three factors includingTeacher Support and Academic Motivation.展开更多
The geometric configuration of the solid fuel is a key parameter affecting the fuel regression rate in hybrid rocket motors. In this paper, a semi-empirical regression rate model is developed to investigate the geomet...The geometric configuration of the solid fuel is a key parameter affecting the fuel regression rate in hybrid rocket motors. In this paper, a semi-empirical regression rate model is developed to investigate the geometric effect on the fuel regression rate by incorporating the hydraulic diameter into the classical model. The semi-empirical model indicates that the fuel regression rate decreases with increasing hydraulic diameter and is proportional to dh?0.2 when convective heat transfer is dominant. Then a numerical model considering turbulence, combustion, solid fuel pyrolysis, and a solid–gas coupling model is established to further investigate the geometric effect. Eight motors with different solid fuel grains are simulated, and four methods of scaling the regression rate between different solid fuel grains are compared. The results indicate that the solid fuel regression rates are approximate the same when the hydraulic diameters are equal. The numerical results verify the accuracy of the semi-empirical model.展开更多
文摘This multivariate study investigated whether Parental Support, Teacher Support, and Academic Motivation mediate the relationship between Parental Status （i.e., children from single or both parents homes） and Academic Performance, The research design used for the study was a cross sectional survey using the quantitative approach. Data set from 250 primary school pupils from the Effutu Municipality were analysed using partial correlation and multiple regression analytical techniques. Among the study findings, that were when the effects of Parental Status were controlled for, Parental Support, Teacher Support, and Academic Motivation still related significantly to Academic Performance. Among the conclusions of the findings are that, whether the child was from a single or both parent home was not important with regard to his or her academic performance but rather it was the quality of support that the child gets from whoever is doing the parenting, teacher support and the child＇s own academic motivation that were important to determine the child＇s Academic Performance. The study also found that Parental Support was the best predictor of the pupils＇ Academic Performance out of the three factors includingTeacher Support and Academic Motivation.
基金supported by the Innovation Foundation of Beihang University for Ph.D.Graduatesby the National Natural Science Foundation of China(Grant No.51206007)
文摘The geometric configuration of the solid fuel is a key parameter affecting the fuel regression rate in hybrid rocket motors. In this paper, a semi-empirical regression rate model is developed to investigate the geometric effect on the fuel regression rate by incorporating the hydraulic diameter into the classical model. The semi-empirical model indicates that the fuel regression rate decreases with increasing hydraulic diameter and is proportional to dh?0.2 when convective heat transfer is dominant. Then a numerical model considering turbulence, combustion, solid fuel pyrolysis, and a solid–gas coupling model is established to further investigate the geometric effect. Eight motors with different solid fuel grains are simulated, and four methods of scaling the regression rate between different solid fuel grains are compared. The results indicate that the solid fuel regression rates are approximate the same when the hydraulic diameters are equal. The numerical results verify the accuracy of the semi-empirical model.
