A palynological and palaeoclimatological record from the southern Philippines since the Last Glacial Maximum

A palynological analysis of a marine sediment core in the southern Philippines,provides a detailed regional vegetation and climate history for the West Pacific Warm Pool(WPWP)since the Last Glacial Maximum(LGM).Chronology was determined by a detailed oxygen isotope record.A higher representation of pollen from tropical upper montane rainforest during the LGM indicate that this forest type moved down along elevation,probabaly due to the lowered temperature.During the last deglaciation and the early Holocene,mangroves were more expanded and tropical mid and upper montane rainforests were restricted,suggesting a rising sea-level and temperature increase.Herbaceous pollen and pteridophyte spore records indicate a much drier condition during the LGM than the Holocene.Mangrove development is controlled by conditions at the river mouth influenced by river discharge.Pteridophyte spores are abundant in wet conditions and are mainly transported by rivers.During the mid-Holocene,the reduction in mangrove pollen and pteridophyte spore appears to be a result of climate change:mainly decrease in river discharge.This may have been affected by the decreasing intensity of the Southeast Asian Monsoon,and the increasing frequency and intensity of warm ENSO events,El Ni?o,in this region.     

一种卷积差法提高谱分辨率的计算机分析

在数字信号谱分析中,加权处理是提高谱分辨率的重要方法。本文对一种提高洛伦兹型谱线分析分辨率的卷积差法作了计算机模拟分析。结果表明卷积差法是一种合适的加权方法,文中的结果对使用该方法时的参数的选择提供有用的依据。     

杭州西湖风景区硅藻调查(2)

本文广泛收集了杭州市内10个风景区的四种不同水域,三个季节的水样,并进行了酸处理、涂片、显微摄影等工作,初步鉴定了10科、27属、67种、5变种的硅藻种类。对四种不同水域的硅藻分布作了生态分析。     

Break—even Analyses for Random production and Demand Processes

Break-even analyses are often used as controlling instruments. Typically, they are applied to support decision processes or to gain information for the control of profits and sales. Firstly, the study gives an overview of the basic accounting systems. Secondly, the study shows possible ways of performing breakeven analyses for a single-stage, make-to-order production in the case of random production and demand structures. To model these structures, queueing systems are employed. As a general result, we see that break-even analyses must always be performed taking into account an existing planning system. Under practical aspects, GI/G/1 systems turn out to map complex real situations realistically. From the examples given it can be concluded that one achieves different results compared with using a deterministic model even in the case of a simple, random effects approach. In particular it is shown that stochastic modelling in general is helpful in avoiding incorrect decisions.     

重要籼型杂交稻亲本“93-11”稻米食味品质的改良

以目前两系杂交稻大量应用的籼型水稻"93-11"和实验室已转化只含双份反义蜡质基因无抗性基因和报告基因纯合水稻"B3"为亲本,通过杂交和多次与"93-11"水稻回交以及分子标记辅助选择反义蜡质基因,将双份反义蜡质基因渗入到"93-11"水稻品种中,获得两种改良类型"93-11"水稻新材料.主要农艺性状考察、拷种以及糙米重量和体积分析显示,除了千粒重、糙米重量和体积,两种改良后水稻的株高、有效穗、每穗实粒数和结实率都与"93-11"对照水稻差异不显著(P0.05).两种改良后水稻蜡质糙米的直链淀粉含量(5.39%和5.01%)均比"93-11"对照(14.06%)极显著下降(P0.01);同时糙米胶稠度分别为93 mm和101 mm,与"93-11"对照(48 mm)比较也达到极显著差异水平(P0.01).研究为今后改良以"93-11"配组的两系杂交水稻食味品质奠定了重要基础.     

金属离子对牛胰岛素淀粉样纤维形成的作用

采用硫黄素（Thioflavin T,ThT）和8-苯氨基-1-萘磺酸（8-Anilinonaphthalene-1-sulfonic acid,ANS）荧光、圆二色谱和偏振光显微镜等方法研究了溶液中金属离子(Mg2+, Cu2+, Zn2+, Co2+, K+, Li+ 和 La3+) 对牛胰岛素淀粉样纤维形成的影响,结果表明,所有金属离子对胰岛素淀粉样纤维化均有促进作用,其作用大小次序为：La3+＞Mg2+＞Cu2+＞Zn2+＞Li+＞Co2+＞K+.这种作用与促进蛋白质疏水区暴露的作用是一致的.相关     

河南省2005年县域经济发展水平综合评价

应用模糊集(Fuzzy Set)和粗糙集(Rough Set)理论研究了评价和预测问题中样本的聚类分析与各因素的合理赋权问题,给出基于原始统计数据,无需人们先验知识的模糊聚类,在此基础上,仅仅从原始的统计数据中挖掘出各评价因素权重,进而开展综合评判的新方法.并依据河南省统计局2003年给出的指标体系和2006河南省统计年鉴数据,对2005年河南省的县域经济综合发展状况进行了聚类实证分析,对各评价因素进行了权重挖掘,根据所得结果对河南省2005年县域经济发展水平进行了综合评价和分析.     

2006年7月2—3日山西南部区域性暴雨成因分析

利用常规气象资料、713雷达资料等,分析了2006年7月2—3日发生在山西南部的区域性暴雨天气过程结果表明：青藏高原北部低并入贝加尔湖低槽,低槽发展引导冷空气南下。为暴雨区提供了触发条件;副热带高压的西伸北抬,导致低空急流的建立、发展与维持,为暴雨区输送了大量的暖湿空气;低空的暖式切变线为暴雨区提供了有利动力条件。     

基于参数研究建立的隧道爆破超欠挖量预测模型

通过多线性回归分析筛选出一些对岩体性质、隧道轮廓和爆破设计影响较大的几个参数,并提出了一个爆破参数影响指标(BPI),它由这几个影响较大的参数定义表达出来。将爆破超欠挖量与这个BPI联系起来,同时,对于隧道的形状、节理产状进行修正,进而建立了合理的隧道爆破超欠挖量预测模型。     

多年冻土地区无基波纹管涵洞融沉分析

为分析波纹管涵洞融沉下的受力机理,利用大型有限元软件对多年冻土地区采用的金属波纹管涵洞和波纹管本身进行力学性能分析,通过分析可知,金属波纹管本身具有较大的横向补偿位移的能力,波纹管涵洞对预防和彻底解决涵洞因融沉而导致的破坏较为有效。