The use of multilocation trials to select cultivars that are better than a control

Multilocation trials are a common means for evaluating new cultivars or strains. Their statistical analysis is often based on multiple comparisons with one or more controls. The purpose of this paper is to demonstrate the use of the Chen-Picket procedure for selecting cultivars that are better than a control, which does not require stringent statistical assumptions and allows conclusions about the probability that the selected subset contains all cultivars that are better than the control. This procedure appears preferable to the multiple t-test, which is often used in the evaluation of yield trials.     

污染数据半参数模型估计的渐近正态性

对固定设计下的污染数据半参数模型估计的渐近分布进行了研究,并在一定条件下证明了该估计具有渐近正态性.     

Reference values: a review

Abstract: Reference values are used to describe the dispersion of variables in healthy individuals. They are usually reported as population‐based reference intervals (RIs) comprising 95% of the healthy population. International recommendations state the preferred method as a priori nonparametric determination from at least 120 reference individuals, but acceptable alternative methods include transference or validation from previously established RIs. The most critical steps in the determination of reference values are the selection of reference individuals based on extensively documented inclusion and exclusion criteria and the use of quality‐controlled analytical procedures. When only small numbers of values are available, RIs can be estimated by new methods, but reference limits thus obtained may be highly imprecise. These recommendations are a challenge in veterinary clinical pathology, especially when only small numbers of reference individuals are available.     

论“一带一路”战略下的湘茶产业发展

分析了在经济新常态背景下湘茶产业发展与"一带一路"战略的内在契合性,并从湘茶产业的现状和"一带一路"战略内涵出发,提出了湘茶产业发展融入"一带一路"战略构想及对策,为切实推进湘茶产业发展提供参考。     

MA(1)时序的三足标尾指数估计量

给出了有限移动平均时间序列尾指数的一类三足标的Pickands型估计量,证明了其弱相合性和渐近正态性,并在均方误差最小的情况下,给出了参数k1的优选.     

MA(1)时序的三足标尾指数估计量

给出了有限移动平均时间序列尾指数的一类三足标的Pickands型估计量,证明了其弱相合性和渐近正态性,并在均方误差最小的情况下,给出了参数k1的优选．     

基于正态云模型的湖北省土地资源生态安全评价

针对综合指数法与模糊综合法无法同时兼顾评价指标模糊性与随机性的问题,该研究将正态云模型引入区域土地资源生态安全评价。基于正态云模型,以湖北省为例,对区域土地资源生态安全状况进行了定量测度。研究结果表明：2000-2010年间,湖北省土地资源生态安全状态从敏感级上升到良好级,土地资源生态安全综合值从2.9397上升为3.6033,区域土地资源生态安全整体水平有变好的趋势,但目前仍有部分指标处于恶劣、危险或敏感级,其单因子指标值<2.5,有待于进一步提高与改善;正态云模型使土地资源生态安全的定量评价兼顾随机性和模糊性,该研究可以为区域土地资源可持续发展提供一定借鉴与参考。     

红河流域杧果种质资源主要数量性状变异与概率分级

为更好地开展杧果种质资源筛选工作,对杧果种质资源进行评价。以86份红河流域杧果种质资源为研究材料,对9个主要数量性状进行统计分析及概率分级。结果表明,9个性状变异系数范围是4.7%~28.81%,变异系数最大的是单果重,最小的是果实宽度。K-S检验显示,叶长、叶宽、叶柄长、可溶性固形物等4个性状均符合正态分布;单果重、果长、果宽、果厚、可食率等5个性状呈偏态分布,去除拖尾部分,也近似看作正态分布。9个数量性状均采用(X-1.2818S)、(X-0.5246S)、(X+0.5246S)、(X+1.2818S)4个点分为5级,使性状1~5级出现的概率分别为10%、20%、40%、20%和10%。相关性分析表明,果实单果重与果长、果宽、果厚、可食率呈显著正相关。本研究的开展可为杧果种质资源的评价及优异种质资源的筛选提供参考。     

基于分组的重尾分布极值指数估计量

利用顺序统计量分组,本论文提出了一类新的重尾分布的极值指数估计量,并在适当的正规变换条件下讨论了该估计量的强弱相合性及渐近正态性.     

茶多酚氧化酶酶学性质研究

采用柠檬酸-磷酸氢二钠缓冲液(pH 5.6)匀浆浸提法和硫酸铵沉淀法,从茶鲜叶中提取多酚氧化酶,并通过分光光度法研究pH,温度,抑制剂对酶活性的影响.结果表明:以邻苯二酚为底物,茶多酚氧化酶PPO的最适pH为5.6,最适温度为50 ℃,亚硫酸钠、半胱氨酸和V-C为PPO的抑制剂.