基于GOCI影像的杭州PM2.5遥感建模及时空变异分析

地球静止卫星上的GOCI(geostationary ocean color imager)传感器具有较高的时间分辨率,在研究短时间尺度内大气PM2.5浓度时空变化方面具有一定的应用潜力.本文根据GOCI影像的波段特征,利用2011-2013年实测PM2.5浓度、大气气溶胶光学厚度(aerosol optical depth,AOD)与气象因子数据,分别进行了GOCI PM2.5浓度单变量和多变量反演建模研究,并结合2013年12月6日的GOCI AOD数据,实现了单日杭州市PM25浓度遥感反演与时空变异分析.结果表明:在单变量模型中,分季节模型的平均相对误差最高值28.11％比年度模型的平均相对误差34.04％低,分季节模型精度优于年度模型;单变量模型的平均相对误差34.04％比多变量模型的平均相对误差48.96％低,单变量模型精度优于多变量模型;把单变量冬季模型应用于杭州GOCI AOD数据,得出逐时大气PM2.5的空间分布,并计算了PM2.5浓度的变异系数,发现杭州各区县变异系数大都在0.5以下,东部和北部的数值较高,中西部地区的值较低.     

从翻译教学和外语教学的异同看本科英语专业翻译教学课堂策略

翻译是英语专业高年级的必修课程,对于翻译教学的研究还远远少于对翻译本身的研究探索。针对现在翻译教学中的普遍现象．即把翻译教学当做外语课来教授．把对外语的讲解多于翻译知识及翻译技能的传授．出现了主次不分．甚至本末倒置的现象．本文将比较翻译教学和外语教学的异同．总结出本科英语专业翻译教学课堂策略。     

Cell membrane-covered nanoparticles as biomaterials

Surface engineering of synthetic carriers is an essential and important strategy for drug delivery in vivo. However, exogenous properties make synthetic nanosystems invaders that easily trigger the passive immune clearance mechanism, increasing the retention effect caused by the reticuloendothelial systems and bioadhesion, finally leading to low therapeutic efficacy and toxic effects. Recently, a cell membrane cloaking technique has been reported as a novel interfacing approach from the biological/immunological perspective, and has proved useful for improving the performance of synthetic nanocarriers in vivo. After cell membrane cloaking, nanoparticles not only acquire the physiochemical properties of natural cell membranes but also inherit unique biological functions due to the presence of membrane-anchored proteins, antigens, and immunological moieties. The derived biological properties and functions, such as immunosuppressive capability, long circulation time, and targeted recognition integrated in synthetic nanosystems, have enhanced their potential in biomedicine in the future. Here, we review the cell membrane-covered nanosystems, highlight their novelty, introduce relevant biomedical applications, and describe the future prospects for the use of this novel biomimetic system constructed from a combination of cell membranes and synthetic nanomaterials.     

Surface superconductivity in the type II Weyl semimetal TaIrTe4

The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe₄ is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe₄. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe₄ that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (T_c) up to 1.54 K being observed. The normalized upper critical field h*(T/T_c) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe₄ provides a new novel platform to explore topological superconductivity and Majorana modes.     

健身气功的特征及推广研究

文章从健身气功的特征及推广策略两个视角对健身气功进行了剖析,从健身气功的价值、生理、生化及心理指标、健身效果以及运动形式特征等方面对健身气功的特征进行了分析。提出,健身气功深厚的民族文化底蕴符合我国大众的心理习惯及健身观念,随着健身气功的推广,文明科学的健身气功将在我国全民健身体系的构建中发挥积极的作用。     

网络发展与高校德育

探讨网络发展给高校德育带来的机遇与挑战 ,以及采取的相应对策。     

On the critical period of Chinese pupils’ moral development: Retrospect and prospect

Research into the critical period of Chinese pupils’ moral development is one of the most important parts in the field of moral psychological study. This paper reviews 20-year literature available on the critical period of pupils’ moral development and its instruments to measure it. It also gives details of its inadequate research into pupils’ moral development and then concludes with some conjectures about the future of this field of study. __________ Translated from Psychological Science, 2005 (2) The authors are grateful to Prof. Zhang Dajun of Research Institute of Education Science, Southwest University of China to this study.     

略论《马氏文通》的“读先乎句”

“读先乎句”是《马氏文通》自创的语法理论之一,它指的是“读”在先、“句”在后组成的一种“读＋句”句型。“读先乎句”可归为今天的3种句型的8个小类。《马氏文通》在讲“读先乎句”时举“君子食无求饱,居无求安”为例,被不少语言学家认为不妥,其实并没有什么不妥。     

长球波函数外推法及其应用-(Ⅰ)

用求积分方程特征值方法求出长球波函数 ,再进行外推 ,重建出由于缺角度而引起数据不完全时的图象 ,避开了反演中的求Radon反变换问题 .通过模型验证 ,在角度缺少较大的情况下所建立的算法在效率、精度、稳定性等方面都有较好结果     

Metaphor,Transferred Epithet与Personification辨析

本文认为隐喻、移位法与拟人法这三个英语辞格是人类思维中三种性质不同的方式的产物，并分析了其表现形式的不同。