EPS保温砂浆干燥收缩性能研究

本文主要研究了聚合物、外加剂和纤维对EPS保温砂浆干燥收缩性能的影响,以改善其收缩性能,使之能够减少因收缩而出现的开裂情况。     

Changing Microspatial Patterns of Sulfate-Reducing Microorganisms (SRM) during Cycling of Marine Stromatolite Mats

Microspatial arrangements of sulfate-reducing microorganisms (SRM) in surface microbial mats (~1.5 mm) forming open marine stromatolites were investigated. Previous research revealed three different mat types associated with these stromatolites, each with a unique petrographic signature. Here we focused on comparing “non-lithifying” (Type-1) and “lithifying” (Type-2) mats. Our results revealed three major trends: (1) Molecular typing using the dsrA probe revealed a shift in the SRM community composition between Type-1 and Type-2 mats. Fluorescence in-situ hybridization (FISH) coupled to confocal scanning-laser microscopy (CSLM)-based image analyses, and ³⁵SO₄ ²⁻-silver foil patterns showed that SRM were present in surfaces of both mat types, but in significantly (p < 0.05) higher abundances in Type-2 mats. Over 85% of SRM cells in the top 0.5 mm of Type-2 mats were contained in a dense 130 μm thick horizontal layer comprised of clusters of varying sizes; (2) Microspatial mapping revealed that locations of SRM and CaCO₃ precipitation were significantly correlated (p < 0.05); (3) Extracts from Type-2 mats contained acylhomoserine-lactones (C4-, C6-, oxo-C6 C7-, C8-, C10-, C12-, C14-AHLs) involved in cell-cell communication. Similar AHLs were produced by SRM mat-isolates. These trends suggest that development of a microspatially-organized SRM community is closely-associated with the hallmark transition of stromatolite surface mats from a non-lithifying to a lithifying state.     

基于EPS的城市排水防涝设施普查内业数据处理系统的设计与实现

主要研究了调用现有排水管线数据、补充新的属性数据及按《城市排水防涝设施普查数据采集与管理技术导则（试行）》导出规定格式Pdb数据的方法,并确定了城市排水防涝设施普查内业数据处理流程,重点研究了基于EPS平台实现外业Excel文件直接调用、点线对象排号的关键技术。     

再生EPS颗粒对砖粉泡沫混凝土性能影响的研究

再生EPS颗粒表面粗糙,且多粒径具有一定的级配,将其加入到废弃微粉新体系泡沫混凝土中,可改善其性能,拓宽其利用渠道。研究了再生EPS颗粒对砖粉泡沫混凝土各项性能的影响。试验结果表明,EPS的掺入使其干密度线性降低,掺量在4%~6%之间时,抗压强度下降缓慢,含水率大幅度下降,抗碳化能力增强,抗冻融能力满足规范要求,导热系数减小。与通过增加泡沫用量获得的同密度等级的砖粉泡沫混凝土相比,掺有再生EPS颗粒的混凝土抗压强度提高,含水率和吸水率降低,性能较为优越。     

柴油发电机和EPS应急电源的比较和应用

文章首先通过介绍规范对自备应急电源的要求,再通过分项介绍柴油发电机和EPS应急电源的工作原理、特点,并从使用可靠性、应急持续时间、经济可行性、机房选择和配套设施等方面对柴油发电机和EPS应急电源进行比较分析,从而总结出柴油发电机和EPS应急电源的优缺点以及在实际工程中的运用。     

Dynamic characterization of EPS geofoam

This paper attempts to describe the dynamic behavior of expanded polystyrene EPS geofoam, and shows the dependence of shear modulus, G, and damping ratio, λ, on shear strain, γ, density, ρ, and confining stress, σ₃, through the results of a series of resonant column and strain- and stress-controlled cyclic compression tests. Shear modulus and damping ratio versus shear strain curves were obtained and a series of equations were developed to model the dynamic behavior of EPS. From stress-controlled cyclic compression tests the effect of the number of cyclic load applications, N, on the maximum axial strain ?_max (for a specific static deviator stress, σ_e, plus the amplitude of the loading cyclic stress, σ_c) and on the dynamic modulus of elasticity E_dyn was evaluated as a function of the EPS density, confining stress, and the applied cyclic stress amplitude σ_c.     

EPS外墙保温体系性能研究

简要介绍了EPs保温系统的性能及特点,采用热工计算理论及有限元程序验算了EPS体系的保温性能,指出该体系传热系数小于节能设计限值,既满足节能标准要求,又符合经济要求,具有广泛的推广前景。     

LTE认证与密钥协商协议的安全分析及改进

近年来,3GPP长期演进(LTE)项目已成为当前4G无线通信系统的主流技术。相对于3G,LTE在接入安全方面做出了很大改进,安全性亦得到提升,然而仍存在着一些安全问题。重点分析了LTE认证与密钥协商协议(EPS AKA)流程中的安全问题,关键信息的明文传送问题、公共密钥泄露问题等。针对这些安全问题提出了相应的改进方案,对其进行了安全性分析。     

枯草芽孢杆菌胞外多糖的快速测定与发酵条件优化

枯草芽孢杆菌B1⑥菌株能产生大量胞外多糖,并且,随着多糖含量的提高,发酵液黏性也随之增加,而测定多糖黏度比测定多糖的含量方法简便、快速,对于生产实践具有一定的指导意义。通过实验,建立了多糖含量与发酵上清液黏度的关系模型,结果显示胞外多糖含量与发酵上清液黏度在一定程度上呈正相关性。应用该模型于胞外多糖发酵条件的优化,筛选出了培养基的最佳碳源、氮源及C/N。经过4因素3水平的正交实验,筛选出的最优发酵方案是:蔗糖3%,硫酸铵1%,(C/N=3/1),Mg-SO4 0.05%,Na2HPO4 0.2%,NaH2PO4 0.1%,CaCl2 0.1%,MnSO4 0￣0.1%,接种量10%￣12%,pH7￣7.5。同时检验了该模型的实用性,测量黏度简单方便,一定程度上可以指导生产实践。     

方正书版中的EPS图

<正> 在目前的各级各类印刷厂中,排版工艺中运用最多的是方正书版系统。这套电子出版系统为我国印刷业的飞跃发展,做出了不可磨灭的贡献。但这套系统由于开发得较早,除了最新的方正书版9.01版是以Windows 98为平台之外,各印刷厂中应用最多的是较早的版本。这些版本的方正书版系统都是以DOS为操作平台的。 现在,Windows 98系统已经成