金银句

★喜欢一个人或讨厌一个人都是一瞬间的事,但是对一个人的信任,却不是那么简单就能再重拾回来的。——选自日剧《恋爱世纪》(读者殷晓玮提供) ★当想念变成习惯的时候,也就离忘记不远了。——读者雍正艳提供     

改进学校课程和提高教学质量

学校必须传授给学生们以符合现代科学进展、符合辩证唯物主义世界观和共产主义道德等客观实际的深刻而长期有用的知识,并且必须进行劳动教育,培养劳动习惯和爱劳动的情感。实现这一目的的途径之一就是改进普通中学的课程和教科书。在已公布的课程标准(即教学大纲)的章、节、课题的说明中预先指出了学生务必学到的要点,同时按照学校集体能力的实际情况,确定补充的或次要的内容。这一关于课程的改进是为了减轻学生的过重负担,同时也指明了所有学生可以掌握的并且必定能达到较高水平的一定量的基本教材的内容。     

澳门蝗虫调查

本文报道澳门蝗虫24种,对其分布和区系作了简要分析。     

时间的价值

时间的价值就像金钱的价值一样:完全体现在如何使用上。只肯花一点点钱以维持生命的守财奴其实等于是个穷光蛋,他的万贯家财也就形同乌有。同样,舍不得花费时间去获取更多的幸福、去使更多的人幸福的人,也是虚度年华。     

Assessment of three-and-a-half-year-old children's emerging phonological awareness in a computer animation context

Four computer-animated tasks were created to analyze the underlying structure of emerging phonological awareness at 3.5 years of age and to explore the factors that influence children's (N = 91) performance on the tasks. Our findings indicated that already at this young age, children are able to master tasks demanding identification, blending, and continuation of phonological units when the tasks are presented in a motivating assessment context. In line with earlier research, children showed higher mastery in dealing with words and syllables than in dealing with phonemes. Targets in the initial position of a word were easier for children to identify than those in the final position. Our analysis provided support for two major dimensions of emerging phonological awareness based on the cognitive operations of the tasks: identification and blending of phonological units.     

Prenatal depression, violence, substance use, and perception of support in pregnant middle-class women

The purpose of this study was to explore the vulnerability for postpartum depression among financially, educationally, and socially advantaged middle-class women (n = 31). Twenty-nine percent reported prenatal depression, 13% reported intimate partner violence, and 22% reported concerns with partner relationships and support expectations after delivery. No illegal substances were reported; however, a past history of smoking and excessive use of caffeine was disclosed. Implications for practice focus on the need to screen and implement intervention programs for these social problems and to adopt measures as a universal standard of care for all women, regardless of demographic advantages.     

Removal of aqueous phenol compound by vacuum membrane distillation

1.IntroductionPhenolisanimportantchemicalindustrymaterial,butitalsoaboundswithserioushazardtoenvironmentandthreatstohumanhealth.Rigidruleshavebeenmadeoutonthephenoldischargeconcentration.Researchesonthetreatmentofphenolwastewaterwerecarriedoutinvariouscountries[1-5].Membraneseparationmethodsincludingreverseosmosis,ultrafiltrationandpervaporationhaveattractedmuchattentionforphenolwastewatertreatment,withcelluloseacetate(CA)membraneemployedmostly[6].Membranedistillationisanewmembraneseparation…     

我国课堂教学评价研究概况、问题与设想

概述我国课堂教学评价研究的现状,包括对课堂教学本质和价值取向、评价标准和指标、教学评价方法的研究。分析我国课堂教学评价存在的问题,包括局限于理论构建,缺少课堂实证研究;缺乏对课堂教学客观、准确、精细的描述;局限于评价标准与指标法,缺乏有效方法的综合运用。提出今后研究的设想,包括进行课堂教学的实证研究,提供对课堂教学的多角度、多类型的描述,同时建立教学评价标准指标体系和行为分类系统,综合使用定量方法和质的方法。     

爸爸忘了你还只是个孩子

本期推出两篇短小精美的文章,表达了父爱的温馨,有兴趣的读者朋友不妨将它们作为范文来诵渎。     

Investigation of blood pulse PPG signal regulation on toe effect of body posture and lower limb height

Objective: To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods: Use a modified non-invasive PPG technique to detect the blood pulse signal on toe with infrared (IR) photo sensor. A protocol consisting of two postures, i.e., supine and 45° reclining, was designed to conduct laboratory trial in this study. During the period of performing the protocol of these postures, the lower limb was passively raised from the heights of 10 cm to 60 cm randomly and individually with sponge blocks underneath the foot. Results: In the supine posture, the higher the foot was passively raised, the more the blood PPG signal decreased. In the 45° reclining posture, the blood PPG signal increased at the beginning and then decreased in the foot height position from 10 cm to 60 cm. In both postures the normalized AC signal changes significantly while the normalized DC signal changes little. Conclusion: The toe PPG signals can obviously indicate the regulated blood volume change with the designated postural procedures due to the heart level position.