数学分析思想在高中数学解题中的应用     

麦康玲 《科教文汇》2015,(15)

数学是一门逻辑性和严谨性都较高的学科,而且在解题时所采用的各种数学方式也间接体现了学科本身的这种特性,所以教师和学生越来越注重数学解题技巧和数学分析思想的学习,尤其是在近些年的数学高考中,具备数学分析思想有着明显的优势,而本文也将主要研究数学分析思想在高中数学解题中的应用,以便进一步提高学生的解题效率。  相似文献   

城市中年空巢女性心理健康影响因素研究     

高颖怡  林玉凤  朱劼  易仲怡  朱颖欣  熊浩  梁诗颖  麦婉婷 《科教文汇》2015,(20)

本研究探讨团体归属感、家庭亲密度对此群体心理健康水平的影响。方法采用症状自评量表（SCL-90）、社会团体归属感量表、家庭亲密度和适应性量表（FACESⅡ）对广东6个城市的239名城市中年空巢女性进行测查。结果显示,心理健康水平与家庭亲密度、社会团体归属感呈显著负相关（p<0.01）,社会团体归属感在家庭亲密度对心理健康的预测中起部分中介作用。结论提示以提高家庭亲密度、社会团体归属感为切入,多方面提出对策以提高其心理健康水平。  相似文献   

《论语》的沿革     

艾乐 《科教文汇》2015,(22)

由于时代的不同、地域的差异,《论语》的版本及其注释在传承过程中呈现出诸多的变化。从《论语》发展变化的宏观角度来看,《论语》在传承过程中经历了三个关键性的历史阶段：汉朝时期,《论语》的版本及注释逐渐形成;宋朝时期,《论语》杂糅各学,内涵逐渐丰富;19世纪末20世纪初,《论语》得到了新的诠释,并直接影响当前对《论语》的解读。  相似文献   

基于改进反馈约束分析的土地集约利用评价模型     

邢颖  张杭杭  乐立  苏志为 《科技通报》2015,(6)

研究一种改进的土地集约利用评价模型,通过低碳节能区域规划,设计土地集约利用数学控制模型,提高土地利用效益。传统方法的模型无法定量刻画土地利用的特定时间和空间上的属性特征,利用效益不高。本文提出一种基于改进反馈约束分析的土地集约利用评价模型,根据不同区域内不同的自然环境特征和环境容量,实现功能分区调整,有效预测和规划今后一定时期内土地资源的开发利用及其发展趋势。对集约利用要素进行有机结合,设计反馈约束算法,进行土地物质、能量和价值信息交流控制模型设计,从经济发展的需要和可能出发,以土地利用数据的测定为基础,按利用现状进行分类调查统计,实现模型改进。仿真结果表明,该模型能有效提高土地利用收益,对降低生成成本,改善生态等方面具有促进作用。  相似文献   

MPG1基因驱动GFP基因在大丽轮枝菌中表达     

张斯  柳燕  徐婷婷  吕乐  竺锡武  陈集双 《科技通报》2015,(5)

为了探讨以MPG1基因作为启动子能否驱动GFP基因在大丽轮枝菌中表达,采用根癌农杆菌介导的真菌遗传转化方法,将含有MPG1-eGFP表达盒的pHMG载体转化入棉花大丽轮枝菌T-9中。经抗生素筛选后转化子约80个/106孢子,荧光显微镜观察转化子菌株孢子和菌丝在荧光显微镜下均发出绿色荧光,基因组DNA-PCR检测、GFP蛋白westernblot检测表明,GFP蛋白在大丽轮枝菌转化子中成功表达。结果表明,MPG1基因作为启动子成功驱动GFP基因在大丽轮枝菌中转录表达。  相似文献   

110kV榭烯北中线防雷研究     

崔乐 《商洛学院学报》2015,(4)

以110 k V榭烯北中线为研究对象,根据线路布置的地形地貌情况、历年落雷及事故统计,并结合线路接地电阻测量值,采用ATP软件对雷击输电线路杆塔和雷绕击输电线路的耐雷水平进行了计算。根据计算结果提出防雷方案,仿真评估了防雷方案的效果,验证了该方案的可行性,可作为该地区雷电过电压防护措施制定和实施的依据。  相似文献   

浙江省城市化与碳排放关系研究     

蔡乐  李浩 《科技与管理》2015,17(2):19-24

浙江省正处于城市化的快速发展阶段,高耗能产业快速发展,能源消费增长迅速,导致浙江省碳排放量逐年增加。在计算和分析浙江省2000—2012年城市化水平与碳排放量的基础上,运用EVIEWS7.0计量分析软件,实证检验了浙江省城市化与碳排放之间的协整关系,以及浙江省城市化发展对碳排放的长期弹性和短期弹性,同时还探究了这两者之间的因果关系。最后根据实证结果进行了综合总结并提出了有关降低浙江省碳排放的建议。  相似文献   

Proteolysis of Sardine (Sardina pilchardus) and Anchovy (Stolephorus commersonii) by Commercial Enzymes in?Saline Solutions     

Chau Minh Le  Claire Donnay-Moreno  Sandrine Bruzac  Régis Baron  Huong Thi My Nguyen  Jean Pascal Bergé 《Food Technology and Biotechnology》2015,53(1):87-90

  相似文献   

The citation evolution law of papers published in the same year but different month          下载免费PDF全文

GAI Shuang‐Shuang  LIU Xue‐Li  ZHANG Shi‐Le  LIU Rui‐Yuan 《Learned Publishing》2015,28(2):132-139

To explore the citation evolution of papers published in the same year but different month, we selected papers from a discipline (physical geography), a subject (diabetes: endocrine and metabolism) and a journal (Journal of Biological Chemistry) published in 2005 as research objects. These papers were divided into six groups according to the difference in publication month, and we analyzed citations to these papers for the 9 years after publication. The results showed that within 5 years after papers from physical geography were published, the overall differences in citations of papers in different groups were statistically significant (P < 0.05); after that, the differences were not statistically significant. Within 5 years after papers from diabetes (endocrine and metabolism) were published, the overall differences in citations of papers in different groups were statistically significant (P < 0.05); thereafter, the differences were not statistically significant. Within 7 years after papers from the Journal of Biological Chemistry were published, the overall differences in citations of papers in different groups were statistically significant (P < 0.05); thereafter, the differences were not statistically significant. Citations of papers followed the same pattern irrespective of discipline, subject or journal: citations of papers published in the same year but different month were obviously different in the first few publishing years, but as time went on, only the difference in publication month in a calendar year did not affect the papers' longer‐term citation.  相似文献   

Biofunctionalized nanoslits for wash-free and spatially resolved real-time sensing with full target capture     

Thierry Le?chlé  Chia-Fu Chou 《Biomicrofluidics》2015,9(3)

We propose biofunctionalized nanofluidic slits (nanoslits) as an effective platform for real-time fluorescence-based biosensing in a reaction-limited regime with optimized target capture efficiency. This is achieved by the drastic reduction of the diffusion length, thereby a boosted collision frequency between the target analytes and the sensor, and the size reduction of the sensing element down to the channel height comparable to the depletion layer caused by the reaction. Hybridization experiments conducted in DNA-functionalized nanoslits demonstrate the analyte depletion and the wash-free detection ∼10 times faster compared to the best microfluidic sensing platforms. The signal to background fluorescence ratio is drastically increased at lower target concentrations, in favor of low-copy number analyte analysis. Experimental and simulation results further show that biofunctionalized nanoslits provide a simple means to study reaction kinetics at the single-pixel level using conventional fluorescence microscopy with reduced optical depth.  相似文献