基于综合运输网络的logit多路径分配模型的求解算法研究

在综合运输路网中增加虚拟的节点和虚拟路段,将交通方式间的转运（换乘）延误当做路段阻抗处理,通过使用现有的交通分配模型和算法去处理带有转向延误（换乘）的交通问题。     

面向事件的地理要素时空回溯研究

以基础地理数据为例,在研究现实世界-计算机世界-数据库中事件-变更操作-要素之间的逻辑关系的基础上,通过建立要素信息表、事件信息表以及包含事件关联、事件约束的事件树索引体系,提出并实现了面向事件的地理要素的时空回溯方法,为地理要素的时空查询与回溯奠定了基础.     

基于ARM的车辆视频检测技术研究

为解决交通拥堵问题, 设计并实现了一套具有实时、便捷、低成本、高精度、低误差的智能交通系统(ITS: Intelligent Transport System)。该系统由道路上架设的摄像头采集实时交通图像为主要研究对象, 在嵌入式Linux 系统下, 采用开源计算机视觉库(OpenCV)对车辆变道的行为信息进行统计计算, 并将完整程序移植到ARM11 微处理器上实现该算法。实验结果表明, 该系统的实时性好、统计结果准确; 系统工作稳定, 数据传输准确, 有效地避免了外界干扰, 具有较强的实用性。     

一类树的Hosoya指标序列

一个图的Hosoya指标是图的所有独立边子集的数目之和,包括空集.T(n1,n2,n3)表示只有一个3度点,三个1度点且唯一3度点到三个一度点的路长分别是n1,n2,n3的树.用代数组合的方法研究了这类树的Hosoya指标值.给出了这类树在一定条件下依Hosoya指标值的排序.     

叶燮以"变"为核心的辩证的理性主义诗学观

叶燮的《原诗》针对当时文坛的复古主义思潮和追求偏僻怪戾的形式主义倾向．提出了以“变”为核心,以“因创”“正变”“源流”的艺术辩证观为内容,以“温柔敦厚”的儒家诗教为指归的理性主义诗学观。     

在LH模型下研究e~+e~-→τ~+μ~-过程

最小Higgs模型(LH模型)中由于镜像轻子和标准模型(SM)轻子之间存在味改变耦合,会对τ+μ-Z(γ)顶角产生单圈贡献,从而使e~+e~-→τ~+μ~-过程的截面增加,这一效应能被实验探测到.利用LH模型研究了e~+e~-→τ~+μ~-过程,在Mathematica 7.0中通过调用High Energy Physics和Loop Tools,经过复杂计算得到其截面σ.通过这类过程探讨LH模型的效应.     

Sea surface temperature records of core ZY2 from the central mud area in the South Yellow Sea during last 6200 years and related effect of the Yellow Sea Warm Current

Sea surface temperature (SST) records in the South Yellow Sea during the last 6200 years are reconstructed by the unsaturation index of long-chain alkenones (K 37 U ’) in sediment core ZY2 from the central mud area.The SST records varied between 14.1 and 16.5°C (15.6°C on average),with 3 phases:(1) A high SST phase at 6.2-5.9 cal ka BP;(2) A low and intensely fluctuating SST phase at 5.9-2.3 cal ka BP;and (3) A high and stable SST phase since 2.3 cal ka BP.Variation of the SST records is similar to intensity of the Kuroshio Current (KC),and corresponds well in time to global cold climate events.However,the amplitude of the SST response to cooling events was significantly different in different phases.The SST response to global cooling event was weak while the KC was strong;and the SST response was strong while the KC was weak.The difference in amplitude of the SST response is possibly caused by the modulation effect of the Yellow Sea Warm Current which acts as a shelf branch of the KC and a compensating current induced by the East Asia winter monsoon.The warm waters brought by the Yellow Sea Warm Current cushion the SST decrease induced by climate cooling,and both the Kuroshio and East Asian winter monsoon play important roles in the modulation mechanism.The SST records display a periodicity of 1482 years.The same period was found in the KC records,indicating that variation of the SST records in the central South Yellow Sea is strongly affected by KC intensity.The same period was also found in Greenland ice cores and North Atlantic and Arabian Sea sediment cores,showing a regional response of marine environmental variability in the East China Seas to that in the global oceans.     

The methodology of quantitative assess economic output of climate change

A method is introduced in this paper to study the effect of future climatic change on the economy. The researchers determine the economic output of climate change from historical data, and provide a method to quantitatively predict economic output of climate change by an economic-climatic model. A historical reciprocating examination is used to analyze output data for various crops in eight agricultural areas in China and meteorological data from 160 observatories in China from 1980 to 2000. The results show that the methods used are reasonable to a certain extent and good in application.     

Changes in physical features of Glacier No. 1 of the Tianshan Mountains in response to climate change

This study analyzes the changes in glacier zones and snow composition of Glacier No.1 in the Tianshan Mountains of China since 1961,and their possible relations with climate.It is found that precipitation dominated the snow composition and that air temperature and precipitation controlled the distribution of glacier zones,but interannual change in precipitation had a relatively large effect on glacier zones and snow composition during 1963–1981 (P10) and 1963–1989 (P11).However,during 1982–2007 (P20) and 19...     

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co,southern Tibet

A 380-cm-long sediment core was acquired from the deep water area of Pumoyum Co, southern Tibet. Twenty-five plant residue samples were selected, and organic carbon stable isotopes were obtained using the AMS ¹⁴C chronological method. The ¹⁴C age and carbon reservoir effect were calibrated with surface sedimentation rate measurements using ²¹⁰Pb dating. Results showed that the core sediment deposited over 19 cal ka BP. Based on a multi-proxy analysis of TOC and IC contents, grain size and pollen assemblage data, the palaeoclimatic evolution of Pumoyum Co was reconstructed since the last glacial. Pumoyum Co was a shallow lake prior to 16.2 cal ka BP; although the glacier around the lake began to melt due to increasing temperatures, climate was still cold and dry. In the interval of 16.2–11.8 cal ka BP, the sedimentary environment fluctuated drastically and frequently. Two cold-events occurred at 14.2 and 11.8 cal ka BP, and these may correspond to the Older Dryas and the Younger Dryas events, respectively. After 11.8 cal ka BP, Pumoyun Co developed into the deep lake as it is now. The lake water temperature was relatively lower at that time because of influx of cold water from glacial meltwater entering the lake. As a result, the multi-proxy indicators showed no sign of warm conditions. Comparisons between the sedimentary record of Pumoyum Co with that of other lakes of the same age in southern Tibet indicate a warmer climate following the last deglaciation influenced the southeastern Tibetan Plateau. These results imply that the southwest Asian monsoon gradually became stronger since the deglaciation during its expansion to the inner plateau. The glacial-supplied water of the lake responded sensitively to cold-events. The entire southern Tibet region was dominantly influenced climatically by the southwest Asian monsoon during the Holocene.