青海省装备制造业的现状及发展趋势

通过对青海省装备制造业的发展历程和现状的调查研究,结合目前国家关于振兴装备制造业的相关政策措施和青海省的省情,提出发展的主要方向,为政府相关部门的决策提供参考。     

基于曲线拟合的卫星通信信号参数盲估计

针对非协作卫星通信环境,提出了一种卫星通信信号参数盲估计方法。它利用线性调制信号功率谱形状的对称性及其与成型滤波器的关系,基于曲线拟合的思想进行功率谱包络的提取,进而实现载波频率、带宽等参数的盲估计。仿真结果验证了该方法对MPSK、MQAM等常用卫星通信信号的有效性,且能适应较低的信噪比,具有计算量小、易于实现等优点。     

从关联性记忆错觉的毕生发展看记忆的适应性特质

记忆重构的过程会导致歪曲或错误.关联性记忆错觉是一种最常见的错误记忆,体现了个体在认知资源有限时对语义梗概信息的适应性利用,这是记忆具有适应性特质的一种体现.另一方面,记忆的适应性还体现为在特定的情景需求下,个体能够通过一定的策略(如充分加工项目特异性信息)抑制关联性记忆错觉的发生,以保持精确记忆.本文从利用梗概表征和抑制关联性记忆错觉两种能力的毕生发展透视了记忆的适应性特质的年龄特征.将来可从记忆演化的角度获得更多关于记忆适应性的证据.     

The determination of atmospheric phosphine in Ny-Ålesund

Phoshpine (PH3), a volatile and toxic gas, has been proved to commonly exist in the environment. The determination of gaseous phosphine and its emission fluxes in Ny-Ålesund is reported in this paper. Results showed that gaseous phosphine exist in Arctic atmosphere commonly and the concentration of phosphine ranged from 16.3–600.2 ng/m³, with the maximum concentration of phosphine in tundra areas and the minimum in surface air of ocean. The concentration of phosphine ranged from 65.79–1259 ng/m³ in colliery atmosphere at different altitudes and the maximum was found in the center of colliery. Emission fluxes of phosphine were different in various Arctic areas. Emission fluxes of phosphine from protected areas, with average concentration of 32.13±5.353 ng m^–2 h^–1, were higher than from other areas. And the flux of phosphine from ocean was lower.     

PH3 monitoring in Arctic and Dalian bay areas

<正> In this paper,we use pre-column 2 times low-temperature cryo-trap enrichment—gas chromatography(GC) /nitrogen and phosphoms detector(NPD)to detect and analyze phosphine in Arctic pole area forthe first time.The results show phosphine exists in all of the samples in Arctic pole biosphere and phosphineconcentration in Arctic atmosphere is between 18.54～132.18 ng/m~3,almost the same as that inAntarctic atmosphere;phosphine concentration in Dalian bay sea surface sediments is between 116.8～554.3 ng/kg,almost the same as that reported in Jiao-zhou bay.Our research of phosphine will shednew light on the mechanisms showing how the phosphorus supplement influences the biogeochemical cycleand global warming.     

不同分辨率岩石CT图像的优化处理方法1)

数字岩心技术在油田开发中得到了越来越多的应用,CT图像处理的准确性是数字岩心技术在石油行业应用的关键。针对同一砂岩进行了三次不同分辨率的CT扫描实验,对获得的三组图像数据分别基于三种图像滤波算法进行处理;并对比分析了各种方法的处理效果,总结出不同分辨率岩石CT图像的最优处理方式。结果表明,随着分辨率增加,CT图像中噪声点总量增加,相边界灰度梯度减小;三种滤波算法中中值滤波和非局部均值滤波在边界信息保护方面效果最好,各向异性扩散滤波除噪能力最强;岩石CT图像在较低分辨率下非局部均值滤波和中值滤波的处理结果均比较理想,对于中等分辨率图像各向异性扩散滤波效果最佳,高分辨率下需要使用非局部均值滤波与各向异性扩散滤波综合处理才能取得理想效果。     

A time-saving method to assess the efficiency of corrosion inhibitors by electro osmosis

The corrosion inhibitor is one of the most important technologies to enhance the durability of steel-reinforced concrete. A kind of time-saving method was developed to assess the inhibitor efficiency by using a 32 V electric field to accelerate chloride ion migration in concrete. Potentiodynamic polarization scanning test was used to evaluate the corrosion states. The comprehensive efficiency of an inhibitor should be assessed in two aspects: resistance to chloride ion permeability and inhibiting efficiency. The specimens with different mixing amount of sodium nitrite and migration corrosion inhibitors were used to verify the accuracy and reliability of this method. The results show the differences in inhibiting efficiency of the inhibitors clearly, indicating the reliability of this time-saving method.     

大规模网络中基于HDHT的病毒疫苗分发算法

目前,反病毒系统防御病毒的主要方法是依靠反病毒中心服务器定期更新各个节点上的病毒定义文件和安装系统补丁,这种被动应对策略常常不够及时,且容易使服务器节点成为系统的性能瓶颈,具有较大的滞后性,也不能适应大规模网络系统。针对大规模网络环境提出了一种高效的基于层次式分布散列表(hierarchical distributed Hash table, HDHT)的反病毒疫苗分发算法。算法基于一种新型层次式分布散列表网络拓扑结构HDHT,利用网络边缘节点直接通信来提高病毒疫苗分发效率,从而有效分担服务器负载。为了增强算法的性能,算法还引入一种简洁的节点信誉评估机制。从分发效率、系统开销等方面,对病毒疫苗分发算法的性能进行实验验证和性能分析。结论表明,该算法可有效实现病毒疫苗在网络中快速分发和部署,同时减轻了网络和服务器的负载。     

基于响应面法的泥水盾构同步注浆材料性能

泥水盾构隧道在富水高压地层掘进中,同步注浆浆液易逸散流失,为满足注浆要求,需研制出复掺外加剂的高性能注浆材料.以南昌地铁4号线过江盾构隧道工程为依托,在传统外加剂材料的基础上引入纳米材料,选用膨润土(BE)、羟乙基甲基纤维素(HEMC)与纳米二氧化硅(NS)为复合外加剂组分,采用响应面法,以外加剂掺量为配合比变量,探讨3种外加剂及其交互作用对注浆浆液性能的影响.研究表明:①在对凝结时间影响方面,NS＞ HEMC＞ BE,NS具有促凝作用,而HEMC起缓凝作用;在对抗压强度影响方面,HEMC＞ NS＞ BE,HEMC与BE不利于抗压强度发展,NS可以显著提高抗压强度;在对抗水分散性影响方面,HEMC＞ BE＞ NS,HEMC与BE有利于改善抗水分散性.②NS具有小尺寸、高活性等特点,可以加速水泥水化进程,缩短浆液初凝时间,提高浆体早期强度,对浆液性能起着积极作用.③通过响应面法建立的回归模型与响应曲面,可以很好地反映外加剂对浆液性能的影响,同时能对复掺外加剂的浆液配比进行优化,所制备的新型注浆材料能够满足在富水高压地层盾构隧道施工的注浆要求.     

温度对铁电隧道结隧穿电阻效应的影响

采用脉冲激光沉积与磁控溅射技术制备Pt/Pb(Zr_(0. 2)Ti_(0. 8)) O_3/Nb:SrTiO_3铁电隧道结,研究环境温度对隧道结隧穿电阻效应的影响.结果表明:随环境温度的增加,隧穿电阻比值减小,这可归结为热发射机制的增强削弱了高低阻态间的差别.