Genetic analysis for brix weight per stool and its component traits in sugarcane （Saccharum officinarum）     

Liu GF  Zhou HK  Hu H  Zhu ZH  Hayat Y  Xu HM  Yang J 《Journal of Zhejiang University. Science. B》2007,8(12):860-866

Brix weight per stool (BW) of sugarcane is a complex trait, which is the final product of a combination of many components. Diallel cross experiments were conducted during a period of two years for BW and its five component traits, including stalk diameter (SD), stalk length (SL), stalk number (SN), stalk weight (SW), and brix scale (BS) of sugarcane. Phenotypic data of all the six traits were analyzed by mixed linear model and their phenotype variances were portioned into additive (A),dominance (D), additive×environment interaction (AE) and dominance×environment interaction (DE) effects, and the correlations of A, D, AE and DE effects between BW and its components were estimated. Conditional analysis was employed to investigate the contribution of the components traits to the variances of A, D, AE and DE effects of BW. It was observed that the heritabilities of BW were significantly attributed to A, D and DE by 23.9%, 30.9% and 28.5%, respectively. The variance of A effect for BW was significantly affected by SL, SN and BS by 25.3%, 93.7% and 17.4%, respectively. The variances of D and DE effects for BW were also significantly influenced by all the five components by 5.1%～85.5%. These determinants might be helpful in sugarcane breeding and provide valuable information for multiple-trait improvement of BW.  相似文献   

浅析如何提高我国短跑运动员途中跑的能力     

薛红 《大连大学学报》2003,24(6):66-68,71

途中跑技术在田径短距离跑项目中是最重要的一个技术环节,对短跑成绩起决定作用. 目前,我国短跑运动停滞不前,关键一环是运动员途中跑的能力没有得到有效的提高.通过和世界优秀运动员的比较,从运动技术、运动能力、能量供应等不同角度,分析影响我国短跑运动员途中跑能力的问题所在,提出解决的有效途径,供大家在以后的教学训练中参考.  相似文献   

固体力学中的加权余量法简介     

张晓哲  王燕昌 《青海师专学报》2004,24(5):49-51

加权余量法(Weigllted Residual Method)是固体力学中一种重要的数值算法，当前岩土工程计算中，许多流行算法如有限元法、无网格法、边界元法都是以它为基础而衍生、发展起来的，本文对加权余量法进行了简要概述，阐述了该方法的理论基础，权函数、试函数的取法，最后通过算例说明该方法的施加过程．  相似文献   

The Durability of Conceptual Change in Learning the Concept of Weight in the Case of a Pulley in Balance     

Olavi Hakkarainen  Maija Ahtee 《International Journal of Science and Mathematics Education》2007,5(3):461-482

This study concerns the question of how teachers can help pupils to perceive the concept of weight (gravitation). Fifth and ninth graders were asked in a paper-and-pencil test to compare the weight of two objects suspended in a pulley-in-balance half a year after the learning intervention consisting of three successive pulley-in-balance demonstrations. The understanding, that some of the fifth graders seemed to have formed from the weight concept after the teacher-independent learning intervention, had almost totally vanished in the delayed study. In the demonstrations the pulley served as an efficient prosthetic device for thinking, helping pupils to pay attention to the behaviour of the whole system instead of looking only at the separate objects. In the ninth grade about 45% of the pupils achieved general understanding about the pulley in balance by transferring the scientific explanation from the pulley demonstrations to the paper-and-pen test. A learning-with-conflict model is proposed based on pupil's alternative explanations about a discrepant event. These explanations are then challenged with a conflicting event. When pupils see and understand how the concept works in different contexts it is possible for the pupils to reach a context independent conceptual change.  相似文献   

AHP方法和算术平均法在农机排序问题的综合应用     

巢建江  胡桃 《江西教育学院学报》1995,16(3):5-12

《江西省２０００年农业机械化战略研究》是江西省科委下达的科研课题，南丰县是课题研究的一个点，我们在南丰县的农机排序中采用了ＡＨＰ方法和算术平均法相结合的综合评价方法对农机排序，在上述方法实施的层次总排序计算中，我们首先采用一般ＡＨＰ计算公式，结果与实际不符，后改为项目总权重与所在子系统项目的个数无关的权重计算公式，得出满意的结果。  相似文献   

Nearing world-class: Singapore’s two universities in QSWUR 2015/16     

Kaycheng Soh 《Journal of Higher Education Policy & Management》2016,38(1):78-87

Many universities strive to become world-class and two of Singapore’s universities are almost there, being ranked 12th and 13th in the QSWUR 2015/16. This study looked into the details of indicator rankings and found that the two universities are comparable to those in the top 10 universities in the same ranking in practically all indicators with the exception of Citations. Further analysis of the data of the 58 highest ranking universities with complete data revealed discrepancies in the assigned and attained indicator weights. Moreover, the Academic and Citations categories were not able to be used in stepwise regression calculations. These indicate that the computed Overall result is not what the ranker intended it to be and needs re-interpretation. If rankings are not anchored in statistical ground, discussions on rankings are at the abstract and verbal level, similar to discourses on alchemy (faith) vis-a-vis chemistry (facts).  相似文献   

Global existence and blow-up of solutions to reaction-diffusion system with a weighted nonlocal source     

蒋良军  王悦生 《上海大学学报(英文版)》2011,15(6):501-505

In this paper, we study a semi-linear reaction-diffusion system with a weighted nonlocal source, subject to the null Dirichlet boundary condition. Under certain conditions, we prove that the classical solution exists globally and blows up in finite time respectively, and then obtain the uniform blow-up rate in the interior.  相似文献   

参量化的Hilbert型积分不等式     

陈广生 《蒙自师范高等专科学校学报》2011,(2):23-26

通过应用权函数方法和实分析技巧,给出一个推广的具有最佳常数因子的Hilbert型积分不等式.作为应用,考虑了它的等价形式及一些特殊结果.  相似文献   

基于未确知测度的企业员工绩效评价     

刘蕾  张月峰  李静静 《科技与管理》2007,9(1):60-63

员工绩效评价是企业管理者与员工之间沟通的一项重要活动，对人力资源管理具有重要的实际作用。针对目前我国大多数企业建立的员工绩效评价制度都不能全面反映员工绩效的真实水平问题，在建立了基于未确知测度的企业员工绩效评价模型的基础上，将定性与定量指标结合起来评价员工绩效，最后以评价销售人员绩效为例进行了分析说明。  相似文献   

确定电子资源评价指标模糊权重的可行方法   总被引：10，自引：1，他引：10  

徐革 《情报理论与实践》2006,29(6):690-693

本文应用模糊理论中的模糊关系和模糊转换法来处理专家群体对电子资源评价指标重要性的问卷调查和数据分析。以基于重心的解模糊化方法确定模糊权重值，充分利用专家所给出的评判信息，将提高最终评测结果的可信度。  相似文献