关于水上客运旅游走可持续发展道路的思考

提出了水上客运旅游应走可持续发展道路的思想 ,着重对可持续发展的必要性、障碍、目标及实施对策等作了较为深入的分析。     

Transport properties on La0.7Sr0.3MnO3/Al2O3/Fe tunnel junctions

Manganese oxide La_0.7Sr_0.3MnO₃ produced on (001) LaAlO₃ substrate by means of sol-gel spincoating method was used as the base electrode of LaSrMnO/Al₂O₃/Fe tunnel junctions. The I-V characteristic in the high bias region of this system was shown to be similar to that of the conventional tunnel junctions. Anomalous temperature dependence of tunneling resistance was observed to be a positive temperature coefficient of resistance. This phenomenon was attributed to the high voltage applied and was simply elucidated from the density states vs. energy diagram. Project(199031) supported by the Science Foundation of Zhejiang Province.     

物质跨膜转运机制及最新研究进展

质膜对物质的通透性由膜和物质本身的属性来决定,脂溶性和分子直径不同的物质通过不同方式实现跨膜转运。本文综述了特跨膜转运的几种机制及春最新研究进展情况。     

ENSO and Southeast Asian biomass burning modulate subtropical trans-Pacific ozone transport

Trans-Pacific transport of enhanced ozone plumes has been mainly attributed to fossil fuel combustion in Asia in spring, but less attention has been paid to vegetation fires in Asia. Here we show that the El Niño-Southern Oscillation (ENSO)-modulated fires in Southeast Asia, rather than Asian fossil fuel plumes, dominate the interannual variability of springtime trans-Pacific transport of ozone across the entire North Pacific Ocean. During El Niño springs, the intensified fires from both the Indochinese Peninsula and Indonesia, together with large-scale circulation anomalies, result in enhanced ozone plumes that stretch over 15 000 km in both the lower-middle and upper troposphere. This enhancement is also observed in the in situ measurements of ozone concentration, with an almost 10% increase at Mauna Loa Observatory, Hawaii, a unique site to monitor the long-distance transport over the North Pacific. This study reports an unexpectedly strong influence of vegetation fires, linked with climate variability, on global tropospheric chemistry and proves once more how complex the interactions in the climate system are.     

我国原油进口航线网络的优化

根据我国原油进口运输以租外轮为主的现实情况,建立改进的运输问题模型,选择典型航线建立原油运输网络,并对其最优化.优化的结果可作为今后我国进口原油运输的参考.     

叶绿体的电子传递和光合磷酸化

介绍了叶绿体中光合电子传递链的类型、电子传递过程的氧化还原本质及光合磷酸化的发现和机理.     

通过自旋进动量子点的自旋相关的隧穿

Spin-polarized transport through a precessing magnetic spin coupled to ferromagnetic electrodes is studied using a non-equilibrium Green＇s function approach. The characteristic of conductance is obtained at zero temperature. We find that competition between spin-exchange interaction on the spin site and spin-orbit interaction in the barriers dominates the resonant behavior of conductance. In a parallel configuration, conductance peaks have identical amplitude. With the angle θ increasing, the width of resonant peaks is broadened or narrowed for different spin coherent states. In an anti-parallel case, spin-flip tunneling in the barriers will essentially enhance amplitude of the conductance peak.     

论异牟寻腾冲筑[车夂]化府之历史价值

异牟寻在腾冲筑[车夂]化府,是管理“申赕”、“寻传”人的需要,却对确立腾冲的重要区域地位,促成自蛮徙居,促进滇西交通、经济、文化发展产生了深远的历史影响。     

网络编码综述

网络编码是近年来通信领域的重大突破,本文在介绍网络编码基本原理的基础上,阐述了网络编码的优缺点、分类、应用和发展趋势。