Environmental effects on different types of AGNs in Chandra Deep Field South

[[abstract]]We investigate the relation between cosmic structures and active galactic nuclei (AGNs) observed in Chandra Deep Field South (CDFS) to study how the evolution of galaxies was affected by environments (eg, galaxy clusters or cluster mergers). A total of 889 X-ray sources, compiled from CDFS and the Extended Chandra Deep Field South (E-CDFS) surveys, are analyzed in the study. An optical catalog of galaxies with multi-colour photometry in the same field is extracted from COMBO-17, which includes about 11,500 (MR≦-19.19) objects with photometric redshifts between 0.2 and 1.2. Using the cross-correlation functions ω(θ) of X-ray AGN and galaxies, 2D galaxies density distribution, and Friends-of-Friends (FoF) algorithm analyses, we note that Type 1 AGNs (with hardness ratio HR<-0.2) are spatially cross-correlated with the center of high number density of galaxies region (HNDoGR), and the Type 1 AGN to galaxy ratio in these regions tends to be higher than average. Moreover, our analyses also reveal a correlation between Type 2 AGNs (HR>-0.2) and galaxies structure; further analyses indicate the number of Type 2 AGNs is much larger than Type 1 AGNs on the outskirts of HNDoGR (~ 0.5 Mpc), and the Type 2 AGN to galaxy ratio around the HNDoGR (~ 0.5 Mpc ) tends to be higher than average. These results may infer that the large number of Type 2 AGNs appearing at low redshift could be associated with HNDoGRs, which are undetected large scale structures (LSS) composed of faint galaxies in the low-redshift universe, the interaction of galaxies in the outer part of the faint LSS can provide a mechanism to boost the formation of Type 2 AGNs. On the other hand, our analyses do not show obvious evidence that the evolution of AGNs is related to larger scale environment such as cluster mergers. With our results demonstrating the different correlations between Type 1/2 AGNs and HNDoGR, deeper observations in the future can offer more data to analyze the properties of faint LSS with AGNs embedded, and to provide new clues to the origins of the different types of AGNs.

脑复康、石杉碱甲、绞股蓝、豆腐果甙和樟柳碱对动物旷场行为的影响

脑复康、石杉碱甲、绞股蓝、豆腐果甙和樟柳碱都是近年来研制的新的中枢神经药物。除脑复康以外,它们都是由我国的植物化学家首次从中草药中提取的新的生物碱或有效成分。本文报道了脑复康、石杉碱甲、绞股蓝、豆腐果甙和樟柳碱对动物旷场行为的影响。结果表明,脑复康、石杉碱甲、绞股蓝和豆腐果甙对动物的旷场行为产生明显的抑制反应,而樟柳碱则使动物的旷场行为引起兴奋反应。</p

Design and Implementation of City FireFighting Mobile Communication and Command System Based on 3S

随着改革开放的不断深入和经济建设的飞速发展，诱发火灾因素急剧增多，各类火灾和其他灾害事故频繁发生，一旦救援不及，将会给人民的生命财产带来巨大的损失。目前，各个城市的公安消防指挥中心一般都通过车载电台、对讲机实现了消防指挥中心、消防车、灾害现场之间的语音通信，但消防车开往灾害现场时，特别是垮辖区救援时，不能快速找到灾害发生地点；先期到达现场的消防员，不能准确汇报出真实的灾害发生位置；救援时，由于消防员对消防水源所在位置不熟，无法快速出水救援；救援过程中，消防员只能通过语音手段汇报灾害现场情况，领导无法更准确地了解灾害情况，不便领导判断救援态势，给救援决策带来困难。因此，为了更有效地保护国家和人民...With the deepening of reform and opening up and rapid development of economic construction, induced a sharp increase in fires factors, various types of fires and other disasters occur frequently, once the rescue is less, will give cause tremendous losses of life and property of the people. Currently, all the city's public security fire command center generally through the car radio, walkie-talkie ...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201123047

Study on Seismic Performance of Buckling-Restrained Brace and its Application on Reinforcement of School Building

防屈曲支撑作为一种新型消能构件，克服了传统支撑受压屈曲、无法充分发挥材料受压阶段的塑性滞回耗能功用的缺点，具有工作原理简单、明确、消能效果好等特点，是一种十分具有应用前景的结构消能构件。本文在国内外相关研究理论和方法的基础上，综合大量文献资料和工程实践经验，对防屈曲支撑做了以下几个方面的研究： 首先，对既有的防屈曲支撑研究进展资料进行构件、组件、结构体系三个层面的归纳与整理，为防屈曲支撑技术的下一步研究奠定理论基础。 其次，对影响防屈曲支撑构件性能的参数进行理论分析与公式推导，主要从防屈曲支撑构件的力学性质、稳定性、力学模型三方面进行归纳与总结。从防屈曲支撑构件延伸到防屈曲支撑结构层面，首...As a new type of energy dissipation component, buckling-restrained brace overcomes traditional brace's drawbacks, such as compression buckling, innability to make full use of material's plastic hysteretic energy dissipation function when under pressure. Buckling-restrained brace also has the advantage of its simple working principle and high-efficiency energy dissipation. It is a kind of very prom...学位：工学硕士院系专业：建筑与土木工程学院_防灾减灾工程及防护工程学号：2532010115169

Surface-enhanced Raman Spectroscopic Studies on New Type Nano-scale Rough Substrates

Fleischmann等于1974年在电化学氧化还原粗糙化处理后的银电极表面观察到吡啶吸附分子的高质量拉曼光谱，随后被证实该类电极存在约106的表面增强效应，这一称为表面增强拉曼散射(SurfaceenhancedRamanscattering，简称SERS)效应的发现成功地奠定了将拉曼光谱应用于表面科学研究的实验基础。但是二十多年过去了，表面增强拉曼光谱（SurfaceenhancedRamanspectroscopy,也称SERS）技术并未象最初所预计那样发展成为很重要的表面科学工具而得到广泛应用，究其原因，主要由于以下三方面问题严重制约了它的发展： i）仅有少数几种金属（主要是Ag、A...ABSTRACT Fleischmann et al. observed the high quality Raman spectra of pyridine adsorbed at an electrochemically roughened Ag electrode surface in 1974. The enhancement of the signal for the adsorbate was confirmed later to be about six orders, and the phenomenon was called as surface-enhanced Raman scattering (SERS) effect. This effect is the fundamental for applying Raman spectroscopy in surfac...学位：理学博士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：B19972501

The influence of accelerated aging on color and microstructure of light-curing composite resin

目的考察加速老化后光固化复合树脂的色度稳定性、表面显微结构和内部化学结构的改变及其相互之间的关系。方法用老化仪加速老化4种光固化复合树脂样本,测量老化24 h和96 h后的色差。用环境扫描电子显微镜和傅里叶变换红外光谱仪分别观察老化前后样本表面的显微结构和化学键的改变。用方差分析法分析老化时间与树脂色度间的交互影响(α=0.05)。结果老化时间与复合树脂类型之间具有交互作用(P<0.05),老化后复合树脂的色度改变具有统计学意义(P<0.05)。老化对复合树脂表面显微结构具有明显的影响,老化后基质出现凹陷,填料颗粒暴露,出现孔隙。老化使树脂内部化学键发生变化,基质中的化学键削弱和裂解,不饱和残余物再度聚合。结论随着老化时间的延长,复合树脂的色度变化加大;老化后混合型填料树脂的色度稳定性最好;老化使复合树脂内部化学键发生变化,色度发生改变。Objective The aim of this investigation was to examine the changes of the color stability,surface microstructure and chemical constitution of light-curing composite resin after accelerated aging,and the relations be-tween them.Methods Four light-curing composite resin were aged in an accelerated aging instrument.The color was measured by CIE L*a*b* with a spectrophotometer after treatment for 24 h and 96 h.And the color differences were calculated.Environmental scanning electron microscopy(ESEM) and Fourier transform infrared spectroscopy(FTIR) spectrometer were used to examine the microstructure and chemical composition of the specimens before and after accelerated aging.The color differences were analyzed statistically by repeated-measures two-way analysis of variance and t-test after aging for 24 h and 96 h.The level of significance was defined as α=0.05.Results The materials demonstrated statistically significant differences in color after aging between the 24 h and 96 h(P<0.05).There were significant influences on the microstructure and the chemical composition after aging.The matrix appeared some concaves and pores,the filler particles exposed after aging.The energy of chemical bonds were weaken or broken under the aging,and the unsaturated polymer reacted again.Conclusion The color differences of the composite resin increase with the aging time and irradiation dose.The hybrid filled composites have the best color stability

The influence of toothbrushing effect on color and microstructure of light-curing resin composites after aging

目的:研究紫外光老化和水老化处理后的刷牙作用对光固化复合树脂的色度稳定性,表面显微结构和内部化学键的影响。方法:用紫外光老化和水老化方法处理光固化复合树脂样本,色度计测量复合树脂老化后刷牙作用造成的色差,用ESEM观察刷牙对处理后样本的表面显微结构,红外光谱仪分析复合树脂老化后刷牙作用对其化学键改变。配对t检验比较老化组间及刷牙组的复合树脂的色差。结果:紫外光老化与水老化后的复合树脂的色差均数之间的差异具有统计学意义(P0.05)。紫外光老化后刷牙导致复合树脂的基质出现凹陷,白色颗粒凸显,且内部化学键发生了明显改变,水老化刷牙后的改变较小。结论:与复合树脂水老化后的刷牙作用相比,紫外光老化后的刷牙作用对复合树脂的表面显微结构和内部化学键破坏作用大;刷牙作用对于老化后的复合树脂的颜色改变没有影响。Objective:The aim of this investigation was to examine the toothbrushing effect on the color stability, surface microstructure and inner chemical constitution of light-curing resin composites after an ultraviolet radiation aging and the water aging. Method:The specimens were treated with an ultraviolet radiation aging and the water aging, the color differences for toothbrushing effect after aging were measured by spectrophotometer,and the surface microstructure of resin composites were observed by ESEM,also the chemical bonds were investigated by a FTIR spectrophotometer. The color differences of resin composites after aging and toothbrushing were carried out with two-sided T-test for the groups. The level of significance was defined as α=0.05. Result:There were significant differences of the average value of color differences between an ultraviolet radiation aging and the water aging(P0.05). Some concaves emerged from the matrix of resin composites,and the wheat particles were exposed. The chemical bonds of the matrix were changed seriously after aging and toothbrushing, but there were litter changes of the matrix after water aging. Conclusion:There were more serious damage of tooothbrushing effect on the surface microstructure and inner chemical bonds of resin composites after an ultraviolet radiation aging then after the water aging. There were no influences of tooothbrushing effect on the color change of resin composites after aging

Interaction of Black Tea and Green Tea Polyphenols with Porcine Pancreatic α-amylase by Fluorescence Quenching

目的:本研究旨在用红茶和绿茶的茶多酚(TEA POlyPHEnOlS,TP)猝灭猪胰腺α-淀粉酶(POrCInE PAnCrEATICα-AMylASE,PPA)的蛋白质内源性荧光。方法:通过获得的荧光光谱,计算STErn-VOlMEr猝灭常数(kSV)、双分子猝灭常数(kQ)、表观静态猝灭常数(kAPP)、动态猝灭常数(kd)和静态猝灭常数(kS)。统计采用T检验,检验水平α=0.05。结果:结合和猝灭反应明显受到PPA结构的影响。通过STErn-VOlMEr荧光猝灭图显示的特征,证实TP与PPA之间发生的荧光猝灭为静态猝灭和动态猝灭。比较动、静态猝灭常数(kd与kS)之间的差异具有统计学意义(P<0.05);双分子猝灭常数(kQ)大于双分子扩散限制性猝灭常数(1x1010.M-1.S-1);表明红茶和绿茶的TP与PPA的反应是以形成基态复合物的静态猝灭为主。伴随红茶和绿茶溶液滴定的浓度增加,PPA荧光发射波长(λEM)发生红移,红茶猝灭时荧光发射波长由384nM红移至404nM,绿茶组则由384nM红移至402nM。红茶和绿茶TP的猝灭效果相同。结论:实验数据提示:TP与PPA的反应确引起了PPA的分子构象发生改变,TP与PPA的反应驱动力源自氢键结合、静电引力和疏水性反应。Objective:To study the binding of black tea and green tea polyphenols to porcine pancreatic α-amylase (PPA) by fluorescence quenching of protein intrinsic fluorescence.Methods:From the fluorescence spectra obtained,the Stern-Volmer (KSV),the bimolecular quenching (kq),the apparent static (Kapp),the dynamic quenching (KD) and the static quenching constants (KS) were calculated.The quenching data was analyzed with t-test (α=0.05).Results:The structure of PPA was revealed to significantly affect the binding/quenching process.From the characteristic feature of the Stern-Volmer plots,the dynamic and the static quenching were decided between tea polyphenols (TP) and PPA.There were significant differences between the dynamic quenching (KD) and the static quenching constants (KS) (P<0.05) ,and the value of the bimolecular quenching (kq) was larger than that of the bimolecular diffusion-controlled quenching constant (1×1010M-1·s-1),which indicated that the static quenching with the ground-state complex formation was the dominant reaction between TP (black tea and green tea) and PPA.In the titration with black tea and green tea solution,there was a small λem shift to higher wavelengths (a red shift from 384 to 404 nm for black tea and 384 to 402nm for green tea) with increasing TP concentration.There were the same effect of fluorescence quenching with the black tea and green tea TP.Conclusion:The data suggested that the reaction between TP and PPA did change molecular conformation of PPA and that the hydrogen bonding,electrostatic and hydrophobic interaction were equally important driving forces for TP-PPA association