发现于泰顺的5种浙江新记录植物

报道了近来发现于温州市泰顺县的5种浙江分布新记录植物,分别是细花虾脊兰(Calanthe mannii Hook.f.)(兰科Orchidaceae)、钮子瓜(Zehneria bodinieri(H.Lév.)W.J.de WildeDuyfjes)(葫芦科Cucurbitaceae)、大齿报春苣苔(Primulina juliae(Hance)Mich.M9llerA.Weber)(苦苣苔科Gesneriaceae)、大果俞藤(Yua austro-orientalis(Metcalf)C.L.Li)(葡萄科Vitaceae)和圆叶母草(Lindernia rotundifolia(L.)Alston)(玄参科Scrophulariaceae).凭证标本保存于浙江农林大学植物标本馆(ZJFC).     

浙江植物分布2新记录属和5新记录种

报道了浙江植物分布2新记录属和5新记录种,即野甘草属Scoparia L.,松香草属SilphiumL.和山白前Cynanchum fordii Hemsl.,原野菟丝子Cuscuta campestris Yunck.,野甘草Scoparia dulcis L.,串叶松香草Silphium perfoliatum L.,竹节草Commelina diffusa Burm.f..凭证标本均存放于温州大学植物标本室.这些类群在浙江的发现丰富了浙江植物区系的内容,为其在我国地理分布的研究提供了基础资料.     

中国薹草属(莎草科)植物资料增补Ⅳ

报道笔者在采集、整理和鉴定时发现的2个中国新记录种和11个省级新记录,以作为中国莎草科Cyperaceae薹草属Carex植物志资料的补充.中国新记录种为斯丁通薹草Carex staintonii和刺猬薹草C.echinata,分别见于西藏吉隆和墨脱;省级分布新记录有湖北新记录截喙薹草Carex truncatirostris、南平薹草C.nanpingensis和纤细薹草C.pergracilis,贵州新记录种丝叶薹草C.capilliformis和糙囊薹草C.scabrisacca,西藏新记录种小粒薹草C.karoi、云南薹草C.yunnanensis、紫鳞薹草C.purpureosquamata和金佛山薹草C.jinfoshanensis,四川新记录短叶亮绿薹草C.finitima var.attenuata,浙江新记录种鹞落薹草C.otaruensis.     

关于记录值序列部分和的渐近正态性

证明了 Burr分布和 Frechét分布的记录值序列的部分和是渐进对数正态的 ,从而解决了文[2 ]中的一个悬而未决的问题     

Almost sure limit points of and the number of boundary crossings related to SLLN and LIL for record times,inter-record times and the number of record values

In this paper, the almost sure limit points and the moments of the number of boundary crossings of some functions of record times, inter-record times and the frequency of record values of a sequence of independent and identically distributed continuous random variables are studied.     

Maximum Likelihood Estimators in a Statistical Model of Natural Catastrophe Claims with Trend

A statistical model to analyse stochastically increasing claims arising out of natural catastrophes is presented. Based on record values, the exponential trends over time can be identified. A more specific three-parameter model involving such a trend is also proposed. Observed claims are modeled as a stochastically increasing sequence of Fréchet distributed random variables. Consistency and asymptotic normality of the joint maximum likelihood estimator are shown. Possible applications in forecasting of claims are indicated. In particular claims data from U.S. hurricanes and Japanese taifuns are discussed. AMS 2000 subject classifications. Primary—62P05, 62F12, Secondary—62H12     

核心素养导向下的科学概念教学*——以“氧化还原反应”为例

“氧化还原反应”是化学学科的核心概念。氧化还原反应理论是对微观粒子发生变化的认识,其学习过程应从化学反应的宏观现象出发辨识物质种类,借助反应物微观粒子模型和生成物微观粒子模型探析粒子变化,从而得出发生氧化还原反应时反应物中原子是如何转化成生成物中原子的,通过分析典型反应对氧化还原反应本质有清晰的认识之后,可不直接研究反应,而间接分析化学方程式得出反应物到生成物是否有电子的转移。     

Ordered Random Variables

We discuss methods, which enable us to express distributions of ordered random variables (classical order statistics, induced order statistics, records and generalized order statistics) via distributions of sums of independent terms.     

广义次序统计量间隔的多维随机排序

本文研究了附加于广义次序统计量底分布以及参数的条件, 使得人们在多维似然比序和多维通常随机序意义下对广义次序统计量的间隔向量进行比较, 同时也给出了文中主要结果的应用.     

On the Convergence Rates of Extreme Generalized Order Statistics

A classical result of extreme value theory yields that in case of a linear normalization three possible types of limit distributions are possible. As proved recently a similar classification of the limit distributions holds for extreme generalized order statistics which provide a general concept of ordered random variables. In this paper, we derive results for the convergence rates of the nth and (n-r+1)st generalized order statistic, respectively. It turns out that the rate is highly influenced by the choice of the normalizing sequence. Moreover, we show that a uniform bound of order 1/n holds for underlying generalized Pareto distributions, whereas for the standard normal distribution the convergence might be very slow. Similar results for ordinary order statistics are included.