新棉种SGK791产量构成因素分析及高产栽培主攻方向

利用2003-2004两年河南省棉花区试与2005年河南省棉花生产试验数据资料,应用偏相关和多元线性回归,分析了SGK791的皮棉产量及其构成因素的量化关系,并用通径分析将影响产量的四个因素（密度、单株成铃数、铃重、衣分）对产量的作用进行分析。结果表明：影响皮棉产量的四个因素对产量的综合作用排序为：每株铃数〉衣分〉单铃重〉密度。据此可知,SGK791高产栽培的关键是在合理密植的基础上,以力争株铃数为主攻方向。     

一致有界随机变量序列的弱律与强律

利用一致有界条件,建立了弱大数定律和强大数定律。它不仅改进了目前的相应结果,同时还获得了弱大数定律与强大数定律的本质差别。     

中职数学教学中数学思想的挖掘与渗透点滴谈

数学教学在向学生展示获取知识、技能及解决问题的思维过程的同时,不仅要善于＂挖掘＂教材中蕴含的数学思想和数学方法,还要使数学思想方法的渗透自然地贯穿于整个教学过程中.     

What fills the gap between discrete and dense? Greek and Flemish students’ understanding of density

It is widely documented that the density property of rational numbers is challenging for students. The framework theory approach to conceptual change places this observation in the more general frame of problems faced by learners in the transition from natural to rational numbers. As students enrich, but do not restructure, their natural number based prior knowledge, certain intermediate states of understanding emerge. This paper presents a study of Greek and Flemish 9th grade students who solved a test about the infinity of numbers in an interval. The Flemish students outperformed the Greek ones. More importantly, the intermediate levels of understanding—where the type of the interval endpoints (i.e., natural numbers, decimals, or fractions) affects students’ judgments—were very similar in both groups. These results point to specific conceptual difficulties involved in the shift from natural to rational numbers and raise some questions regarding instruction in both countries.     

The view from within: a curatorial account of the rise and fall of visits to London museums from 1851–2016. A research note

ABSTRACT

This note addresses two questions: what comparing patterns of attendance at a group of museums and art galleries since 1851 might reveal? and how might the museums themselves have explained those figures? This note considers the rises and falls of visit numbers amongst a sample of 15 London museums over a 160-year period, and how the institutions themselves perceived those figures. The data used here were gathered from the museums’ published annual reports and internal documents, including daybooks and memos. Their presentation here introduces readers to an exceptionally long time series, and to the conventionally neglected voices of museums’ managers, whose circumstances and attitudes informed those museums’ management. These notes show that certain external factors affected simultaneous rises and falls in the majority of museums’ figures across the sample, although there were always exceptions. Some trends are revealed as general tendencies over a number of years. Discrete internal factors, such as temporary closures and exhibitions create peaks and troughs at individual institutions.     

网络环境下高校图书馆过刊的开发与利用

本文分析了印刷型过刊的特点与作用,以及影响其利用率的一些因素。阐述了网络环境下印刷型过刊再开发的必要性,并提出和论述了开发过刊一系列新的措施:可从转化、编辑、管理、服务等方面进行重新开发。     

关于“书脊标准化”研究之我见——兼与凌黎、李桂芳及朱金德同志商榷

通过正反两方面的比较分析,认为推广实施书脊标准化是必要的,同时对其可行性进行充分细致的探讨。     

多重组合数的性质

由与多重组合数（multinomial numbers)有关的几个概念得到3个结论：等价化过程不改变组合数的大小、平均化过程使组合数变大。这给写出多元多项式（x1 x2 ... xn)^m展开式中系数最大的一项提供了一种很便利的方法。     

幂势

给出幂势的概念,得出幂势的一些结论以及相应的定理.     

自然数数码和的m次方映射数列的周期性

证明了自然数数码和的m次方映射数列{nk}为周期数列,给出了当m=2,3,4,5,6时,{nk}的周期节及对任意自然数n,必存在自然数k0,当k≥k0时,Tk(n)进入相应周期节的条件。