元极学与逻辑学关联研究初探     

王新民 《人天科学研究》1999,8(1):25-29

对元极学逻辑推理与形式逻辑进行初步的研究,指出演绎逻辑对于元极学学科构建与发展的重要性,元极学必须培养发展创新自身的形式语言与逻辑体系,使之呈现出更强大的语言表现和演绎功能。分析讨论了元极学的概念命题演绎结构与逻辑特征,元极学推理逻辑模式以生化返演化起论,以“极化致和”典型范式的无穷存在与演化构建逻辑理论与推理过程,与数理逻辑中以真假为主体的理论体系有明显不同的特征。讨论了元极学推理逻辑与数理逻辑  相似文献   

Rational design of high-quality 2D/3D perovskite heterostructure crystals for record-performance polarization-sensitive photodetection     

Xinyuan Zhang  Lina Li  Chengmin Ji  Xitao Liu  Qing Li  Kun Zhang  Yu Peng  Maochun Hong  Junhua Luo 《国家科学评论(英文版)》2021,8(10)

Polarization-sensitive photodetection is central to optics applications and has been successfully demonstrated in photodetectors of two-dimensional (2D) materials, such as layered hybrid perovskites; however, achieving high polarization sensitivity in such a photodetector remains extremely challenging. Here, for the first time, we demonstrate a high-performance polarization-sensitive photodetector using single-crystalline 2D/3D perovskite heterostructure, namely, (4-AMP)(MA)₂Pb₃Br₁₀/MAPbBr₃ (MA = methylammonium; 4-AMP = 4-(aminomethyl)piperidinium), which exhibits ultrahigh polarization sensitivity up to 17.6 under self-driven mode. To our knowledge, such a high polarization selectivity has surpassed all of the reported perovskite-based devices, and is comparable to, or even better than, the traditional inorganic heterostructure-based photodetectors. Further studies reveal that the built-in electric field formed at the junction can spatially separate the photogenerated electrons and holes, reducing their recombination rate and thus enhancing the performance for polarization-sensitive photodetection. This work provides a new source of polarization-sensitive materials and insights into designing novel optoelectronic devices.  相似文献   

中国网络心理研究综述     

刘京林 《湖南大众传媒职业技术学院学报》2009,9(5):16-21

中国新闻传播界对于网络心理的研究愈来愈重视,特别是对于研究网络心理的重要意义已经有了较深刻的认识。中国网络心理研究的几个关注点包括网络与社会心理的交互整合、现代心理学理论和社会心理学视角的网络心理研究、网络群体极化的心理机制分析。  相似文献   

Unintended consequences on gender diversity of high-tech growth and labor market polarization     

Elsie L. Echeverri-Carroll  Michael D. Oden  David V. Gibson  Evan A. Johnston 《Research Policy》2018,47(1):209-217

There has been considerable media coverage highlighting the lack of gender diversity in Silicon Valley, stressing the relatively low participation of women in the high-tech economy. Austin offers a unique case for testing whether similar gender issues characterized other high-tech regions because the city has historically benefited from the expansion of Silicon Valley’s large high-tech firms since the 1980s. The gender-biased business practices identified in Silicon Valley firms may have been transferred to their branch plants in Austin. Our analysis shows women’s losses in middle-skill occupation employment shares were concentrated in the low-tech industry and were partially offset by job share gains in high-skill occupations in the same sector between 1980 and 2015. Men’s losses in middle-skill occupation job share were also mainly concentrated in the low-tech sector but were partially offset by employment share gains in high-skill occupations only in the high-tech industry during this period. Women made large gains in relative real median wages only in high-skill occupations in the high-tech industry while their relative real median wages in other skill occupations and in the low-tech industry stagnated around zero during this period. Men’s gains in relative median wages were also concentrated only in the high-tech industry but were less than half of women’s and were negative (between ?10 and ?21 percent) in other occupations in the high-tech industry and across all occupations in the low-tech industry. As noted in previous studies, the impact of job polarization is not well understood across sectors and gender. This study finds the high-tech industry in Austin has had unintended consequences in terms of job polarization across gender, providing relatively fewer job opportunities in high-skill occupations to women than men but offering much higher gains in relative real median wages to women than men. Males also found relatively more job opportunities in high-skill occupations in the high-tech industry than women but experienced only half of women’s gains in relative median wages in this industry between 1980 and 2015.  相似文献   

基于分位数回归的网络群体极化度量     

杜杨沁  霍有光  锁志海 《图书情报工作》2011,55(24):38-43

网络群体极化现象是非理性行为的重要表现之一,如何及时发现群体极化的倾向是舆情预警和引导是否有效的关键所在。引入分位数回归模型,以网络论坛为研究对象,尝试形成网络群体极化预警定量指标,以快速形成舆情应急预案。  相似文献   

基础教育阶段两极分化问题的原因及策略探析     

陶志志  何声清 《科教文汇》2013,(15):126-126,128

伴随基础教育课程改革的进程,两极分化已成为教育工作者无法回避的现实问题。基于基础教育阶段两极分化所呈现的若干现状,深度分析了两极分化产生的原因,提出了新课改语境下解决两极分化问题的策略：给学生提供良好的竞争环境,帮助学生建立合适目标,让学生在＂最近追赶区＂里,逐渐拉近与追赶目标的距离,最终减轻两极分化带来的影响。  相似文献   

N80钢在中性介质中垢下腐蚀机理的研究     

周静  柏任流 《黔南民族师范学院学报》2007,27(6):60-64

碳钢管线在水的集输过程中常常发生了局部腐蚀,在NaHCO3-NaCl为中性介质的溶液里,研究侵蚀性阴离子对N80钢垢下腐蚀的机理以及腐蚀产物对电极电化学行为的影响。  相似文献   

表面和界面效应对铁电薄膜极化分布的影响     

李立本  李雪玲  张运强 《周口师范学院学报》2005,22(2):20-23

运用铁电的Thomas和Landau理论,研究了外延铁电膜中极化分布受表面和界面的影响.结果表明:由于膜中存在表面和界面效应的竞争,对于超薄膜,表面效应占优,界面处极化强度(极化)变小;反之对于厚膜,界面效应占优,界面处极化变大.外推长度δ大于零、正比于膜中电偶极子间的关联长度η,δ/η与偶极子倔强系数的大小有关、与温度无关.  相似文献   

碳酸盐热稳定性的定量探讨     

吴春莲 《青海师专学报》2001,21(6):37-39

探讨了碳酸盐热稳定性与离子极化作用之间的定量关系，并应用中心原子稳定势预测其分解温度。  相似文献   

极化电荷体密度和极化强度关系的一种简明推导     

徐媛 《楚雄师范学院学报》2006,21(6):20-21

利用电偶极子的电荷密度的表达式,并借助δ函数导出极化电荷体密度和极化强度关系。  相似文献