一种改进的三帧差分运动目标检测

针对当前常用运动目标检测方法易受到光照和噪声影响、不易提取完整运动目标,提出一种改进的三帧差分运动目标检测算法.首先取连续三帧图像,对前两帧进行滤波及边缘提取,将提取结果进行异或运算,保留前两帧之间不同的边缘信息,然后对后两帧图像进行差分二值化,并进行膨胀处理,粗略得到运动目标,最后将该结果与异或结果进行与运算即可得到较为完整的运动目标边缘图.实验表明,该算法简单易行、可实时检测、能有效提取出运动目标边缘,改善了差分法常出现的运动目标信息丢失问题.     

Structural characterization and ferroelectric ordering in (C3N2H5)5Sb2Br11

A ferroelectric crystal (C₃N₂H₅)₅Sb₂Br₁₁ has been synthesized. The single crystal X-ray diffraction studies (at 300, 155, 138 and 121 K) show that it is built up of discrete corner-sharing bioctahedra and highly disordered imidazolium cations. The room temperature crystal structure has been determined as monoclinic, space group, P2₁/n with: , and and β=96.19^°. The crystal undergoes three solid-solid phase transitions: ) discontinuous, continuous and discontinuous. The dielectric and pyroelectric measurements allow us to characterize the low temperature phases III and IV as ferroelectric with the Curie point at 145 K and the saturated spontaneous polarization value of the order of along the a-axis (135 K). The ferroelectric phase transition mechanism at 145 K is due to the dynamics of imidazolium cations.     

Weak hydrogen-, halogen- and stacking ππ bonding in crystalline 5-chloro-1-indanone. An analysis by using X-ray diffraction, vibrational spectroscopy and theoretical methods

Intermolecular forces of C–HO, C–Hπ, COCl and ππ types are present in the stable triclinic crystal structure of 5-chloro-1-indanone. They are analysed from a geometrical point of view supported in some extent by the analysis of the vibrational spectrum of the titled compound. Moreover, the molecular structure of the isolated species is calculated by using ab initio as well as density functional theory (DFT) methods together an assortment of basis sets. In order to obtain some information about the influence of intermolecular forces on the molecular structure, the calculated geometries of a free molecule were compared with the experimental solid phase geometry determined by X-ray crystallography.An analysis and assignment of the vibrational spectrum of the 5-chloro-1-indanone is accomplished by using IR and Raman experimental data along with Pulay et al.’s scaled quantum mechanical force field (SQM) methodology starting from the theoretical B3LYP/6-31G(d) and BLYP/6-31G(d) force fields under C_s symmetry.     

Banach space characterizations of unitaries: A survey

We survey Banach space characterizations of unitary elements of C^∗-algebras, JB^∗-triples, and JB-algebras. In the case of the existence of a pre-dual, appropriate specializations of these characterizations are also reviewed.     

Detection of Intrinsically Resistant Candida in Mixed Samples by MALDI TOF-MS and a Modified Naïve Bayesian Classifier

MALDI-TOF MS is one of the major methods for clinical fungal identification, but it is currently only suitable for pure cultures of isolated strains. However, multiple fungal coinfections might occur in clinical practice. Some fungi involved in coinfection, such as Candida krusei and Candida auris, are intrinsically resistant to certain drugs. Identifying intrinsically resistant fungi from coinfected mixed cultures is extremely important for clinical treatment because different treatment options would be pursued accordingly. In this study, we counted the peaks of various species generated by Bruker Daltonik MALDI Biotyper software and accordingly constructed a modified naïve Bayesian classifier to analyze the presence of C. krusei and C. auris in simulated mixed samples. When reasonable parameters were fixed, the modified naïve Bayesian classifier effectively identified C. krusei and C. auris in the mixed samples (sensitivity 93.52%, specificity 92.5%). Our method not only provides a viable solution for identifying the two highlighted intrinsically resistant Candida species but also provides a case for the use of MALDI-TOF MS for analyzing coinfections of other species.     

核电项目社会稳定风险评估

【目的】构建涉环保重大工程项目社会稳定风险评估机制,推进决策科学化和民主化,预防和减少群体性事件。【方法】针对核电项目的具体特点,结合社会稳定风险评估理论研究和专家咨询,构建广西核电项目社会稳定风险评估的指标体系,然后运用层次分析法计算各指标权重,并采用综合指数法评估其综合风险等级。【结果】本研究初步构建一套完整的核电项目社会稳定风险评估体系,实例研究得出广西核电项目综合风险等级为中级。【结论】该社会稳定风险评价指标体系有较强的针对性和可操作性,对核电项目的社会稳定风险防控和涉环保重大工程项目社会稳定风险评估工作具有一定的借鉴意义。     

水稻撒直播栽培技术的优势分析

水稻撒直播栽培方式与普通移栽及现在极力推广的软盘抛秧栽培方式相比具有省工，省时，投入少，收益高，生育期缩短的优点，可以广泛地在劳动力及季节紧张的三熟二季稻地区推广，还可以作为填闲补荒的重要农业生产补救措施，撒直播要求在栽培上采取一播全苗，密植，施足底肥，后期防倒伏等相关技术措施。     

制约我国男子标枪成绩提高的因素探析

通过中外优秀男子标枪运动员身体形态、专项能力和技术特征等方面的对比分析,对我国男子标枪运动滞后于世界先进水平的原因进行了探讨.认为,身材矮、力量小、专项能力差、技术不完善是我国男子标枪运动落后的主要原因.     

惠民凹陷沙三期—东营期断裂活动性研究

应用断层落差法,对惠民凹陷沙河街—东营期的断裂活动特征进行了研究.研究表明惠民凹陷古近纪经历强烈的伸展活动,断层活动强烈.凹陷内部的断层主要以北东向为主,断层活动具有分段性的特点,惠民凹陷断层活动形成了多种断裂几何形态.盆地边缘断层和内部断层的活动形成了半地堑、半地垒和地堑—地垒形式的断块体,其断块体组合的分布使整个惠民凹陷具有南北分带、东西分块的分区块断的构造特征.沙三—沙二早期,惠民凹陷处于快速伸展断陷期,中央背斜带隆起,临商断裂带和夏口断裂带活动较强;沙二上—东营组沉积期伸展裂陷活动减弱.经过古近纪断陷期的构造演化,基本确定了惠民凹陷的构造格局.     

多普勒效应对紫外吸收温差谱的影响

探讨了紫外吸收温差谱的形成,谱线加宽可能是其成因之一,不同的物质在不同的温度范围内其主导因素可能各异。分析了温度对多种谱线加宽的影响,并对多普勒效应致温差谱函数进行了理论推导。对于温差谱具有峰位不变和负峰等特征的一类物质,比如C₆₀和黄体酮等,得出的结果可对其给出很好解释,多普勒效应可能是这类物质紫外吸收温差谱形成的主要因素。