具有非单调发病率传染病模型解的存在唯一性

利用上、下解方法及相应的单调迭代方法研究了一类具有非单调发病率的传染病模型,获得了解的存在唯一性.     

判别分析在土壤资源质量评价中的应用——以怀远县为例

本文试用判别分析法,利用计算机对怀远县土壤资源进行评价。选用12个典型土种,9个变量(即评价项目),并进行数字化。经多变量判别分析后,8个变量被入选而有效。然后选取最佳参数建立判别模式,对未知归属的土种进行判别归类,对典型土种的等级进行验证或适当调整。判别结果与经验评价分类完全一致。     

大众化进程中地方院校教学质量的保障

自高等教育步入大众化以来，地方院校投入不足，定位不当，面临着教学质量的挑战。加强评估和督导，自强、自律是质量保障的关键。     

计算机清绘地质图件的方法及其应用

介绍了利用计算机清绘地质图件的基本原理和方法。该方法是将人工编制的草图,经过图形数字化输入、数值处理、线条光滑连接及加宽等步骤,将其还原为原图的内容,并从指定的外部设备上快速输出。由计算机清绘的图件精度高、国幅美观、缩放灵活,在实际应用中取得了满意的效果。     

动力学系统中连续白噪声的数字仿真

在对有连续高斯白噪声作输入的线性连续动力学系统作数字仿真时，必须慎重选择随机数发生器的统计性质，以使系统得到“忠实”的反映。本文给出了随机数产生器的统计性质和连续随机过程的统计性质之间的关系，指出前者不仅依赖于后者及系统本身，还依赖于数字仿真中所采用的积分方法和积分步长。最后，以Ｅｕｌｅｒ积分和Ｒｕｎｇｅ－ｋｕｔｔａ积分为例，分别给出了相应的公式。     

试论中学语文的文言文教学：如何提高中学生文言阅读能力

本文认为提高中学生的文言文阅读能力，突出学生的主体性是十分重要的。如何突出学生的主体性，本文从三个方面进行了分析。     

Distribution and origin of high magnetic anomalies at Luobusa Ophiolite in Southern Tibet

The Luobusa Ophiolite,Southern Tibet,lies in the eastern portion of Indus–Yarlung Zangbo suture zone that separates Eurasia from the Indian continent.An aeromagnetic reconnaissance survey has revealed an EWtrending Yarlung Zangbo River aeromagnetic anomaly zone,and it is considered to be caused mainly by the Indus–Yarlung Zangbo Ophiolite.The Luobusa Ophiolite reflects the eastern portion of the Yarlung Zangbo River aeromagnetic anomaly zone.Conventionally,the ultramafic rock in the Luobusa Ophiolite is considered as the origin of the high magnetic anomalies.However,results from the surface magnetic survey and the magnetic susceptibility measurements from drill cores indicate that the high magnetic anomalies are distributed inhomogeneously in the Luobusa Ophiolite.In some cases,the susceptibility exhibits more than 30 times difference between two sides of the same sample.A fact emerged that the susceptibility of dunite with serpentinization is higher than that of fresh dunite,harzburgite and chromite when we analyzed the measurement results.In order to understand the origin of the high magnetic anomalies,we measured the density and susceptibility of 17 samples,microscopic and electron probe analyses have been performed as well.The result indicates the presence of dunite with serpentinization containing an abundant of micro-fissures filled with magnetite.Olivine has a susceptibility of about 2.7–351(910-5SI),pyroxene about 16–320,and chromite about200–800.All these units feature relatively low susceptibility in ultramafic rock,and only the magnetite is characterized by a high susceptibility of about 200,000(910-5SI).Based on these observations,we conclude that the precipitation of magnetite in the process of serpentinization of the olivine caused by the geological process in the Luobusa Ophiolite is the origin of high magnetic anomalies.     

基于小数据量的方言普通话语音识别声学建模

为在少量数据情况下显著提高方言普通话的识别率,针对标准普通话和方言普通话之间发音差异是连续变化的特点,在少量方言普通话的基础上,提出了基于距离度量的识别基元扩展方法,并将扩展基元与状态相关的基于基元的模型归并方法相结合.采用1 h的上海普通话数据作为开发集,用本方法,使音节错误率降低了17.3%. 另外与自适应方法的结合使用,还可以将音节错误率再降低6.6%, 这比单纯应用自适应方法错误率多降低了5.4%.     

南方红壤区崩岗侵蚀治理模式探讨

崩岗在我国南方红壤区中广泛分布,它破坏土地资源,恶化生态环境,是我国南方红壤区侵蚀最严重、危害最大的土壤侵蚀方式之一.加快对崩岗侵蚀治理的研究也就成为我国南方红壤区水土保持中的重中之重.文章拟从崩岗侵蚀类型和侵蚀发展过程方面进行分析,探讨并总结出崩岗侵蚀治理的模式,旨为我国南方红壤区崩岗的治理提供科学依据.