张学良西北开发思想及其启示

张学良不仅是一位爱国将军,一位民族英雄,也是中国现代化建设的先驱。早在20世纪30年代,他就提出开发西北的一些设想,认为开发西北是复兴中国的基础,开发西北要革除私心,一致动员,借鉴美国的西部开发,同时要注意交通、环境、民族等问题。这些设想虽在当时由于缺乏现实条件难以实现,但是其现代化建设思想的重要组成部分,对今天的西部大开发仍有借鉴意义。     

辣椒常规品种子叶诱导植株再生体系的建立

以辣椒常规品种保加利亚尖椒与赤研6号为材料,探讨了激素、苗龄、有机成分、AgNO3等因素对子叶再生的影响.观察到PD添加剂对常规品种辣椒离体子叶不定芽的诱导分化及伸长有明显的促进作用.保加利亚尖椒的子叶分化频率达到100%,赤研6号的分化频率达到83%.芽伸长率分别为75%与55%,生根率达到80%以上.建立了辣椒常规品种的子叶离体高效再生体系.     

浅谈汉译英时主语的选择

本文主要分析了学生在做汉译英时主语常常丢失的情况。这是因为其一:汉语是话题优先型语言,话题与主语重合或话题出现而主语不出现的现象十分普遍;而英语是主语优先型语言,话题仅是一种特殊现象;其二:在做翻译练习时,主语选择的错误受到二语习得母语迁移的影响     

An analysis of variables affecting length of stay in foster care

The purpose of this paper was to find out whether the relationship between type of contact with agency and/or child in foster care and average number of contacts over time makes any difference in length of stay in foster care. Four types of contacts were examined: Family—Agency, Family Initiated—Agency, Social Worker—Initiated, and Family—Child. Results indicated that there were critical numbers for each contact type found to be statistically significant that would tend to reduce the length of the child's stay in foster care. The importance of contact during the first month of placement was emphasized.     

Scaling the prestige,authority, and income potential of college curricula

This paper develops the concept of “targeted education,” a theoretical ranking of college curricula, into a multidimensional framework. The new scales, based on the traditional stratification dimensions, prestige, authority, and income, are then used in a study of sex differences in the process of occupational achievement among men and women with college degrees. The targeted education scales predict occupational prestige and wages 7 years after the college degree, and they point out interesting differences between male and female attainment processes. In general, targeted education has a greater quantitative impact for men's occupational outcomes than for women's prestige and income, but results also suggest significant qualitative differences between men and women. A large proportion of women target their education toward, and end up in, an under-employed labor pool for the primary and secondary school system.     

肾叶唐松草微量元素和氨基酸的测定

本文利用原子吸收光谱法测定了中药肾叶唐松草中所含14种微量元素,利用氨基酸分析仪对它所含的氨基酸进行了鉴定及含量测定,并对根、茎、叶等不同部位的微量元素和氨基酸含量分别做了比较。     

德布罗意公式不属于量子力学理论体系中的公式——兼与北师大梁绍荣先生商榷

论述了德布罗意公式不属于量子力学理论体系中的公式。指出梁绍荣等编的《量子力学》一书中,用德布罗意公式推导出自由粒子的波函数的错误。本文用量子力学理论推导出自由粒子的波函数。     

A note on the asymptotic optimality of a two population sequential probability ratio test

It is shown that a two population sequential probability ratio test studied by a number of recent authors in the context of sequential medical trials is asymptotically optimal.     

Sequential procedures based on M-estimators with discontinuous score functions

Bounded-width sequential confidence intervals and sequential tests for regression parameter based on M-estimators are extended to the case where the score-functions generating the M-estimators have jump-discontinuities. In the context of the asymptotic normality of the stopping variable, for the confidence interval problem, it is observed that the jump-discontinuities induce a slower rate of convergence. The proofs of the main theorems rest on the weak convergence of some related processes and this is also studied.     

A stochastic Newton-Raphson method

A stochastic approximation procedure of the Robbins-Monro type is considered. The original idea behind the Newton-Raphson method is used as follows. Given n approximations X₁,…, X_n with observations Y₁,…, Y_n, a least squares line is fitted to the points (X_m, Y_m),…, (X_n, Y_n) where m<n may depend on n. The (n+1)st approximation is taken to be the intersection of the least squares line with y=0. A variation of the resulting process is studied. It is shown that this process yields a strongly consistent sequence of estimates which is asymptotically normal with minimal asymptotic variance.