直方图的优化存储和快速检索

直方图是一种非常重要的图像特征,常用于基于内容的图像检索系统中,例如,用颜色直方图可以检索到相似颜色的图像。但是,目前使用的颜色直方图比较小、维数量多是３,因而检索效果不令人满意。该文提出用倒排文件解决高维巨型直方图存储和快速检索问题,从而为巨型直方图在图像检索中的应用提供一种解决方案。     

基于视频的倒立摆摆起控制

在视觉信息用于连续反馈中,人们提出了基于视觉的伺服控制形式,对视觉传感器得到的图像进行快速处理,在尽量短的时间内给出反馈信息,构成系统的位置闭环控制。本文基于视频的倒立摆摆起控制,提供了一个视觉反馈倒立摆摆杆位置来控制的途径。文中对视频采集系统和软件设计进行了详细介绍,并给出了实际效果图。     

LVB-220W3型倒立式电流互感器爆炸故障诊断分析

本文阐述了一座220k V变电站倒立式电流互感器在正常运行过程中,发生的一起爆炸事故,并结合其爆炸前带电取油色谱数据进行分析探讨,目的在于提高制造工艺质量,通过科学、有效的管理,减少倒置式电流互感器事故的发生,与此同时并对生产安装及运行维护提出了改进措施和技术对策。     

Sugeno测度空间基于复样本的统计学习理论

引入复g_λ随机变量、准范数的定义,给出了复g_λ随机变量的期望和方差的概念及若干性质;证明了基于复g_λ随机变量的马尔可夫不等式、契比雪夫不等式和辛钦大数定律;提出了Sugeno测度空间中复经验风险泛函、复期望风险泛函以及复经验风险最小化原则严格一致性等定义;证明并构建了基于复g_λ随机样本的统计学习理论的关键定理和学习过程一致收敛速度的界,为系统建立基于复g_λ随机样本的统计学习理论奠定了理论基础。     

Efficient and scalable architecture for searchable symmetric encryption

The existing encryption schemes were usua11y poor of index construction and maintenance,which was difficu1t to meet the retrieva1 requirements for distributed ciphertext.Aiming at the above shortage of existing schemes,a structure of separab1e ciphertext inverted index was proposed for improving the performance of para11e1 constructing cryptograph index,simp1ifying the data maintenance process,and increasing the compatibi1ity with the traditiona1 NoSQL system.The method of centra1ized inverted index was adopted to improve the retrieva1 efficiency of distributed retrieva1 system.Then,the proposed scheme was proved to meet the wide1y adopted IND-CKA security standard.Fina11y,Cassandra was combined to eva1uate the severa1 performance parameters,and the experimenta1 resu1ts show proposed architecture has good app1icabi1ity to the distributed and massive encrypted data environment.     

Immobilization of Lathyrus cicera Amine Oxidase on Magnetic Microparticles for Biocatalytic Applications

Amine oxidases are enzymes belonging to the class of oxidoreductases that are widespread, from bacteria to humans. The amine oxidase from Lathyrus cicera has recently appeared in the landscape of biocatalysis, showing good potential in the green synthesis of aldehydes. This enzyme catalyzes the oxidative deamination of a wide range of primary amines into the corresponding aldehydes but its use as a biocatalyst is challenging due to the possible inactivation that might occur at high product concentrations. Here, we show that the enzyme’s performance can be greatly improved by immobilization on solid supports. The best results are achieved using amino-functionalized magnetic microparticles: the immobilized enzyme retains its activity, greatly improves its thermostability (4 h at 75 °C), and can be recycled up to 8 times with a set of aromatic ethylamines. After the last reaction cycle, the overall conversion is about 90% for all tested substrates, with an aldehyde production ranging between 100 and 270 mg depending on the substrate used. As a proof concept, one of the aldehydes thus produced was successfully used for the biomimetic synthesis of a non-natural benzylisoquinoline alkaloid.     

The Functional Characterization of GCaMP3.0 Variants Specifically Targeted to Subcellular Domains

Calcium (Ca²⁺) ions play a pivotal role in physiology and cellular signaling. The intracellular Ca²⁺ concentration ([Ca²⁺]_i) is about three orders of magnitude lower than the extracellular concentration, resulting in a steep transmembrane concentration gradient. Thus, the spatial and the temporal dynamics of [Ca²⁺]_i are ideally suited to modulate Ca²⁺-mediated cellular responses to external signals. A variety of highly sophisticated methods have been developed to gain insight into cellular Ca²⁺ dynamics. In addition to electrophysiological measurements and the application of synthetic dyes that change their fluorescent properties upon interaction with Ca²⁺, the introduction and the ongoing development of genetically encoded Ca²⁺ indicators (GECI) opened a new era to study Ca²⁺-driven processes in living cells and organisms. Here, we have focused on one well-established GECI, i.e., GCaMP3.0. We have systematically modified the protein with sequence motifs, allowing localization of the sensor in the nucleus, in the mitochondrial matrix, at the mitochondrial outer membrane, and at the plasma membrane. The individual variants and a cytosolic version of GCaMP3.0 were overexpressed and purified from E. coli cells to study their biophysical properties in solution. All versions were examined to monitor Ca²⁺ signaling in stably transfected cell lines and in primary cortical neurons transduced with recombinant Adeno-associated viruses (rAAV). In this comparative study, we provide evidence for a robust approach to reliably trace Ca²⁺ signals at the (sub)-cellular level with pronounced temporal resolution.     

基于模糊空间非标准划分的模糊神经控制

提出一种基于模糊空间非标准划分的模糊神经控制方法。该方法克服了基于模糊空间标准划分 (网格状划分 )的模糊子空间急剧增加(指数增长 )的弊病 ,减少了计算负担。并通过对倒立摆控制的仿真研究说明了所提方法的有效性     

基于三线摆运动完整描述的转动惯量测量方法

为了避免近似解析解带来的误差，文中利用拉格朗日方程，建立了可完整描述三线摆运动的微分方程，并利用数值分析方法来求解方程。最后通过算例分析了转动惯量与摆动周期的关系曲线以及摆盘、摆线尺寸对测量结果的影响。     

Si/C对高铬铸铁初生奥氏体稳定性及碳化物的影响

通过改变高铬铸铁(Cr15)的硅含量,研究Si/C对高铬铸铁初生奥氏体及碳化物的影响。结果表明:随着Si/C增加,初生奥氏体中固溶的Si原子含量增加,C、Cr原子含量减少,奥氏体稳定性降低;初生碳化物呈生长初期易粗大而后生长受限的趋势演变;硬度值递增是由于Si原子固溶强化、碳化物含量增加及大量奥氏体转变成马氏体综合作用的结果;C、Cr原子微区富集增加,共晶碳化物形核核心及凝固温度区间先收窄再扩大的共同作用导致共晶碳化物尺寸先减小再增大。