混凝土路面裂缝的成因与防治

阐述了水泥混凝土路面的破坏类型以及裂缝的主要表现形式,着重分析了水泥混凝土路面产生裂缝的成因,并提出了一些相应的预防及处理措施.     

关于判别素数的充要条件

利用等幂和与判别素数的充要条件及等幂和与Bernoulli数的同余关系,获得了与Bernoulli数有关的判别素数的充要条件,得到了整除Bernoulli数的充要条件,同时还得到了G.Giuga猜想的三个等价命题．     

量子区分与量子克隆简述

在经典信息理论中,编码状态可以精确复制与区分;而在量子信息中,由于态的叠加性存在,使得非正交态不可区分,量子态不可复制与删除.但是,量子态的区分和克隆在新型的量子信息科学中具有广泛的应用,例如量子密码的接收和窃听等.本文简要介绍量子态的区分和克隆的数学概念及相关研究结果.     

一种新的线性判别准则在人脸识别中的应用

针对Fisher线性判别分析(LDA)在进行人脸识别这种小样本问题分类时常常遇到类内散度矩阵Sw奇异,而无法直接应用的问题,提出一种新的线性判别准则,即:定义一个新的准则函数,在对类内散度矩阵无奇异性要求的情况下,找到此准则函数最优的权向量.应用此判别准则和Fisher LDA方法分别在ORL人脸数据库上选取40个人的图像进行识别率的测试,Fisher LDA方法的识别率为0.95,而本文方法的识别率可以达到0.955,优于Fisher LDA方法.     

Fisher判别法在聚合物驱潜力评价中的应用

首次将判别分析法用于化学驱潜力评价 ,提出了一种基于Fisher判别法的聚合物驱潜力评价方法 ,并编写了相应程序。该方法优点在于计算快捷 ,考虑因素较为全面 ,计算结果具有较高的可靠性。在目前利用已实施聚合物驱区块的统计数据构造样本集较为困难的情况下 ,综合利用正交设计、油藏数值模拟和经济评价 ,提出了样本集的生成办法。以胜利油区为例进行了分析 ,回代数据总正判率达到 94 .0 % ,从而验证了该方法的有效性。同时 ,该方法提供的研究思路可推广到其他三次采油方法的潜力评价中。     

Fisher判别法在聚合物驱潜力评价中的应用

首次将判别分析法用于化学驱潜力评价,提出了一种基于Fisher判别法的聚合物驱潜力评价方法,并编写了相应程序。该方法优点在于计算快捷,考虑因素较为全面,计算结果具有较高的可靠性。在目前利用已实施聚合物驱区块的统计数据构造样本集较为困难的情况下,综合利用正交设计、油藏数值模拟和经济评价,提出了样本集的生成办法。以胜利油区为例进行了分析,回代数据总正判率达到94．0％,从而验证了该方法的有效性。同时,该方法提供的研究思路可推广到其他三次采油方法的潜力评价中。     

Visual discrimination of target displacement remains after damage to the striate cortex in humans

Damage to the striate cortex usually causes blindness in those regions of the visual field which map to the area of neural damage. Nonetheless, there are reports that some patients with such damage can localize and perform certain visual discriminations between light stimuli presented within the 'blind' area of the visual field. Experiments on animals with different brain areas ablated suggest that visual function is served by two principal projection pathways from the retina. That to the striate cortex is primarily responsible for fine discrimination between stimulus parameters such as colour and spatial pattern, whereas that to the superior colliculus in the midbrain is responsible for visual localization of stimuli. The residual visual functions in patients with cortical damage are usually attributed to the non-striate retinal projection to the superior colliculus. We now present measurements of spatial discrimination in two observers with large visual field defects (scotomata) caused by damage to the striate cortical region. Both exhibit a near normal ability to discriminate displacements of targets when two lights are flashed sequentially in their defective visual field, but they are unable to discriminate spatial pattern or size. We argue that these results are consistent with the 'two visual systems' interpretation of ablation studies on non-human species.     

Combining sap flow meas- urement-based canopy stomatal conductance and ^13C discrimination to estimate forest carbon assimilation

The available methods for studying C uptake of forest and their problems in practices are reviewed, and a new approach to combining sap flow and ^13C techniques is proposed in this paper. This approach, obtained through strict mathematic derivation, combines sap flow measurement-based canopy stomatal conductance and ^13C discrimination to estimate instantaneous carbon assimilation rate of a forest. Namely the mean canopy stomatal conductance （gc） acquired from accurate measurement of sap flux density is integrated with the relationship between ^13C discrimination （A） and G/Ca （intercellular/ambient CO2 concentrations） and with that between Anet （net photosynthetic rate） and gco2 （stomatal conductance for CO2） so that a new relation between forest C uptake and A as well as gc is established. It is a new method of such kind for studying the C exchange between forest and atmosphere based on experimental ecology.