基于聚类和NSCT的遥感图像融合算法

研究遥感图像融合问题。针对遥感图像数据在时间、空间和光谱方面差异大,图像分辨率低等问题,为有效提高遥感图像的分辨率,提出了一种基于聚类和NSCT的遥感图像融合算法。首先对源图像进行小波变换提取源图像特征;然后利用改进的模糊C均值聚类算法在多特征形成的特征空间上对图像进行区域分割,并在此基础上对区域进行NSCT分解,通过设计的区域相似度度量方法,以信息度大的区域作为融合区域,对不同的区域采用不同的融合规则进行融合,最后进行重构得到融合图像。仿真结果表明,对比其它图像融合算法,改进的遥感图像融合算法可获得较理想的融合图像,具有一定的实用性。     

分析与防范计算机犯罪

介绍计算机犯罪的几种形式,提出了防范的方法,及关于完善计算机犯罪刑事立法的粗浅意见。     

财务人员考试及评分系统的设计与实现

文章介绍了财务人员考试及评分系统的主要功能,对各功能模块中所涉及到的一些关键算法的设计给出了实现方法,尤其对极具通用性的扣分标准的实现给出了较为详细的算法。     

Multi-Omics Revealed Molecular Mechanisms Underlying Guard Cell Systemic Acquired Resistance

Systemic Acquired Resistance (SAR) improves immunity of plant systemic tissue after local exposure to a pathogen. Guard cells that form stomatal pores on leaf surfaces recognize bacterial pathogens via pattern recognition receptors, such as Flagellin Sensitive 2 (FLS2). However, how SAR affects stomatal immunity is not known. In this study, we aim to reveal molecular mechanisms underlying the guard cell response to SAR using multi-omics of proteins, metabolites and lipids. Arabidopsis plants previously exposed to pathogenic bacteria Pseudomonas syringae pv. tomato DC3000 (Pst) exhibit an altered stomatal response compared to control plants when they are later exposed to the bacteria. Reduced stomatal apertures of SAR primed plants lead to decreased number of bacteria in leaves. Multi-omics has revealed molecular components of SAR response specific to guard cells functions, including potential roles of reactive oxygen species (ROS) and fatty acid signaling. Our results show an increase in palmitic acid and its derivative in the primed guard cells. Palmitic acid may play a role as an activator of FLS2, which initiates stomatal immune response. Improved understanding of how SAR signals affect stomatal immunity can aid biotechnology and marker-based breeding of crops for enhanced disease resistance.     

Na+ and/or Cl− Toxicities Determine Salt Sensitivity in Soybean (Glycine max (L.) Merr.), Mungbean (Vigna radiata (L.) R. Wilczek), Cowpea (Vigna unguiculata (L.) Walp.), and Common Bean (Phaseolus vulgaris L.)

Grain legumes are important crops, but they are salt sensitive. This research dissected the responses of four (sub)tropical grain legumes to ionic components (Na⁺ and/or Cl⁻) of salt stress. Soybean, mungbean, cowpea, and common bean were subjected to NaCl, Na⁺ salts (without Cl⁻), Cl⁻ salts (without Na⁺), and a “high cation” negative control for 57 days. Growth, leaf gas exchange, and tissue ion concentrations were assessed at different growing stages. For soybean, NaCl and Na⁺ salts impaired seed dry mass (30% of control), more so than Cl⁻ salts (60% of control). All treatments impaired mungbean growth, with NaCl and Cl⁻ salt treatments affecting seed dry mass the most (2% of control). For cowpea, NaCl had the greatest adverse impact on seed dry mass (20% of control), while Na⁺ salts and Cl⁻ salts had similar intermediate effects (~45% of control). For common bean, NaCl had the greatest adverse effect on seed dry mass (4% of control), while Na⁺ salts and Cl⁻ salts impaired seed dry mass to a lesser extent (~45% of control). NaCl and Na⁺ salts (without Cl⁻) affected the photosynthesis (P_n) of soybean more than Cl⁻ salts (without Na⁺) (50% of control), while the reverse was true for mungbean. Na⁺ salts (without Cl⁻), Cl⁻ salts (without Na⁺), and NaCl had similar adverse effects on P_n of cowpea and common bean (~70% of control). In conclusion, salt sensitivity is predominantly determined by Na⁺ toxicity in soybean, Cl⁻ toxicity in mungbean, and both Na⁺ and Cl⁻ toxicity in cowpea and common bean.     

行政处罚中"工程合同价款"的认定研究

建设工程领域的法律制度规范在设定法律责任时,将"工程合同价款"作为罚款基数的规定很多.但"工程合同价款"含义的不确定性,造成行政执法实践中认定的混乱.一方面应厘清合同价款、工程价款、工程造价等常用概念,另一方面要遵循契约自由的基本原则,探求当事人约定的实质内容,结合行政处罚规定设定的 目的,考虑行政行为的一致性及效率性原则,通过多种渠道、按照一定顺序来确定作为行政罚款基数的工程合同价款.     

氘/钯气-固系统中过热现象的量热研究(三)

在凝聚态核科学低能核反应的研究领域中,通常使用等温量热法来计算系统中产生的过热功率.由于反应室结构以及在标定实验和触发实验中使用的气体的导热系数的不同,反应室内会产生不同的温度梯度和温度分布.另外,气体压力的变化也会改变反应室内热传递方式,进而进一步影响反应室内的温度梯度和温度分布,这些原因导致利用等温量热法计算的过热功率存在较大的测量误差,这类误差在很多的过热测量中被误认为是系统产生的过热功率.     

氘/钯气-固系统中过热现象的量热研究(二)

若处于量热计中的反应室所产生的热量未能被完全测量,则会在用氮气作为标定气体,测量氢(氘)气与材料之间的反应热时,就会因标定和触发实验中所使用气体的导热系数的差异,测量到错误的过剩热功率.随着输入功率的增加,这种"过热"功率也会随之增大.通过使用稳定的热流式(塞贝克)量热计来讨论这种测量误差,并提出了减少误差的方法.同时对Rossi专利内容的真实性提出了质疑.     

一种新的基于梯度方向直方图的图像配准方法*

构建了一种新的局部梯度方向直方图,同时定义了特征点的主方向,从而提出了一种具有旋转不变性的图像配准算法.首先采用高斯加权求模技术对特征点邻域内的像素的梯度作直方图统计,确定出具有旋转不变性和抗噪性的特征点主方向;然后用主方向作角度直方图统计,确定待配准图像之间的旋转角度.根据得到的特征点信息及旋转角度定义了特征点对互信息匹配准则,这样使得新配准算法对于图像间旋转角度的范围没有限制,获得了良好的配准效果.