巧用数学方法"乘风破浪"解题——2020年高考物理选择题解决的数学方法应用赏析

本文通过对2020年高考全国Ⅰ、Ⅱ、Ⅲ卷中几道选择题的数学方法解题赏析,提出数理结合将有利于科学思维能力的发展,特别是科学推理与论证的能力提升.     

浅谈数学课中的读题教学

在数学课中,读题教学具有举足轻重的作用.站在低年级角度说,读题是审题的前提,是解题的基础.通过读题,可以帮助学生理解题意,理清条件与问题,明确条件与问题的种种联系,使要解决的问题在头脑中有一个清晰的印象,为解题作良好的铺垫.站在学生成长角度说,低年级打好基础,利于后续发展.因此,培养低年级学生良好的读题方法和习惯非常重要.但是,低年级数学读题教学往往不被重视.在以往教学中,经常发现有些学生对题目只粗略地看看,然后想当然地做起来,答案自然不正确.     

Specific impairment in developmental reading disabilities: a working memory approach

Children with developmental reading disabilities (RD) frequently display impaired working memory functioning. However, research has been divergent regarding the characteristics of the deficit. Our investigation addressed this controversy by assessing Baddeley's working memory model as a whole rather than focusing on particular aspects of it, as has been done by much of the research to date. Participants included 20 children with RD and 20 typical readers between the ages of 9 and 13. The phonological loop, visual-spatial sketchpad, and central executive were assessed according to Baddeley's model. The results demonstrated that children with RD have an impaired phonological loop but intact visual-spatial sketchpad and central executive functioning as compared to controls. In terms of the phonological loop, the deficit appears to be specific to the phonological store. Furthermore, our research supports a relationship between phonological processing and phonological loop functioning.     

Intensity and physiological strain of competitive ultra-endurance exercise in humans

The aim of this study was to determine the magnitude and pattern of intensity, and physiological strain, of competitive exercise performed across several days, as in adventure racing. Data were obtained from three teams of four athletes (7 males, 5 females; mean age 36 years, s = 11; cycling .VO(2 peak) 53.9 ml . kg(-1) . min(-1), s = 6.3) in an international race (2003 Southern Traverse; 96 - 116 h). Heart rates (HR) averaged 64% (95% confidence interval: +/- 4%) of heart rate range [%HRR = (HR - HR(min))/(HR(max) - HR(min)) x 100] during the first 12 h of racing, fell to 41% (+/-4%) by 24 h, and remained so thereafter. The level and pattern of heart rate were similar across teams, despite one leading and one trailing all other teams. Core temperature remained between 36.0 and 39.2 degrees C despite widely varying thermal stress. Venous samples, obtained before, during, and after the race, revealed increased neutrophil, monocyte and lymphocyte concentrations (P < 0.01), and increased plasma volume (25 +/- 10%; P < 0.01) with a stable sodium concentration. Standardized exercise tests, performed pre and post race, showed little change in the heart rate-work rate relationship (P = 0.53), but a higher perception of effort post race (P < 0.01). These results provide the first comprehensive report of physiological strain associated with adventure racing.     

A comparison of blood pressure in term, low birth-weight infants of smoking and nonsmoking mothers

Infants exposed to the components of cigarette smoke in utero are at an increased risk for perinatal death, low birth weight, sudden infant death syndrome, and premature delivery. The purpose of this pilot study was to compare blood pressure values in term low-birth weight infants (相似文献   

Factors contributing to parents' selection of a communication mode to use with their deaf children

This study examines factors contributing to parents' selection of a communication mode to use with their children with hearing loss. More than 90% of children with prelingual hearing loss have normally hearing parents. Communication difficulties are among the obstacles facing these parents in connection with these children's development. Controversy over manual and aural/oral methods of communication creates further complications. Case studies of two families with deaf children were conducted to identify factors that could influence parents' selection of a communication method. Semistructured questionnaires and unstructured interviews were used in data collection. A qualitative approach was used in data analysis. Based on the results, the factors influencing parental choice were grouped under four themes: (a) the influence of information provided to parents, (b) parents' perceptions of assistive technology, (c) attitudes of service professionals and educational authorities, and (d) quality and availability of support services. Implications of these themes for service provision are discussed.     

纸条飞呀飞

今天,我们请来了华南师范大学心理学硕士、广州市天河区第一实验小学教导主任朱海英老师,为小朋友的小纸条做个小点评吧。纸条1我上课爱说话,怎么办?我上课爱说话,常被老师批评,怎么办?(小强)小强,你能主动给朱老师写纸条,这已经是进步的开始!也有很多小朋友向我提过类似的问题,每次我都给他们提两点建议,他们很快就改掉了坏毛病,成绩也上来了。你不妨试试。1.积极参与课堂活动。人不能一心二用,如果你与别人说话,你就无法集中精力听课。要集中自己的注意力,你可以用眼睛盯着老师的脸,耳朵听老师的话,老师让大家做什么你就做什么。这样你就…     

平衡问题与三角函数(高一、高三)

物体所受到的各力之间的关系常用三角函数表示,在平衡问题中尤为突出.这类问题对应用三角函数公式有较高的要求. 1.同角三角函数的基本关系式例1 人对均匀细杆的一端施力,力的方向垂直于杆,要将杆从地板上缓慢无滑动地抬到竖直位置,试求杆与地板间的最小动摩擦因数.     

双缝干涉的图象研究(高二、高三)

在杨氏双缝干涉实验中,让一束单色光投射到一个有两条狭缝S,和52的挡板上(s,与凡相距很近).光在挡板后的空间互相叠加,发生干涉现象.在挡板后放一个屏,就可在屏上观察到明暗相间的条纹,如图1所示. 但是,在以上证明过程中,我们运用了近似处理,即rl+r:、ZL.也就是说,当L》d,L》。时,、一普是成立的.那么,当尸离尸。较远时,即不满足L》a时,亮纹的间距又是怎样呢? 这可以用函数图象分析. 如图2所示,以线段515:的中点为原点建立直角坐标系. 动点:尸(x;,y尸)“‘马一尸51一尸52=5 2 52尸戈a︸b令 设51与S:相距为d,挡板与光屏相距为L.取屏上一…     

风是你在天堂的呼吸

以为都能忘记转身又想起你也许只能靠时间来抚平这个伤口风知道我想你也许风是你在天堂的呼吸