【摘 要】
:
Horqin Sandy Land is a fragile,seriously desertified region located in Inner Mongolia of China.Overgrazing is one of the primary drivers of desertification in this region.We investigated whether the e
【出 处】
:
Journal of Arid Land
论文部分内容阅读
Horqin Sandy Land is a fragile,seriously desertified region located in Inner Mongolia of China.Overgrazing is one of the primary drivers of desertification in this region.We investigated whether the establishment of grazing exclosures in areas with act
其他文献
针对放射性物料加工过程的特殊要求,基于RFID技术的特点,开发物料跟踪系统,实现放射性物料加工过程中的跟踪定位以及重要参数的记录和存储,从而保证放射性物料的严格监管,同时为产品的质量管理提供数据支持。
基因表达数据的高维数、高噪声的特点,使得对其做判别分析之前进行数据降维是必要的。特征提取和变量选择作为降维方法各有利弊。本文针对基因表达数据分析的特点,提出了一种在特征提取过程中嵌入变量选择的方法,并将该方法应用于前列腺癌基因表达数据库中。结果显示,该方法所提取的特征不仅具有良好的判别能力,而且能够在特征提取过程中实现变量选择,从而增加了模型中单个基因对判别癌症的解释意义。
In order to analyze the signaling function of hydrogen peroxide (H2O2) production in senescence in more detail, we manipulated intracellular H2O2 levels in Arabidopsis thaliala (L.) Heynh by using the
Respiratory motion is a major factor that affects the quality of PET images of the thoracic area. The diaphragm moves about 15-20 mm due to respiratory motion, which substantially degrades the effecti
Bisulfite at low concentrations(L-NaHSO3) increases cyclic electron transport around photosystem I(PSI) and photosynthesis.However,little is known regarding the detailed contribution of cyclic electro
To achieve a fully automatic registration between HJ-1 CCD images and HJ-1 infrared images is a difficult task as it must deal with the varying illuminations and resolutions of the images,different pe
将研究性教学引入《数字图像处理》课堂教学中,阐述了研究性课堂教学模式的设置原则,提出了适合课程特点和学生水平的三类问题或研究主题,以及研究性教学实施的4个主要步骤,并讨论了在实施过程中应遵循的原则和注意的问题,提高了学生综合运用所学知识和技术手段解决问题的能力,取得了较好的教学效果.
MSU Stego Video is a public video steganographic tool, which has strong robustness and is regarded as a real video steganographic tool. In order to increase the detection rate, this paper proposes a n
线性走时插值(LTI)算法应用于三维射线追踪时,其向前处理过程中的极小值方程是超越方程,无法求出解析解.虽然可以采用网格剖分方式近似求解,网格剖分精度越大,计算结果越精确,但随着剖分精度的提高,向前处理的计算量会以N3的阶次增加,从而导致计算效率的降低.本文将最速下降法引入到LTI射线追踪算法的向前处理,提出了一种求解三维LTI超越方程的快速数值解法,该方法也不是一种精确求解方法,而是沿着负梯度方
图像插值是数字图像处理中的基本算法,三次卷积插值算法是图像插值中最常用的算法之一.当插值核函数定义在(-2,2)区间上时,其插值精度可达o(h3),即3阶收敛.为了提高插值精度,文章把核函数的定义区间扩大到(-3,3),此时插值精度可达o(h4).在左、右边界点插值时通过利用相邻采样点数据的相关性来解决数据缺失问题,这样可使全部插值过程达到4阶收敛.