一种阵列式海洋磁力测量系统   总被引：1，自引：0，他引：1  

宗发保  邓瑞辉  任来平  顾建松  邹鹏毅  余恺 《海洋测绘》2015,35(1):45-47

基于多台海洋磁力仪、测深仪和GPS,研制了数据合成器、水下拖体、电源适配器、数据收录兼导航软件,最终构建了一种阵列式海洋磁力测量系统。该阵列式海洋磁力测量系统具备3个磁力仪通道,动态噪声≤0.3n T p-p,采样率为10Hz,水下部分总重量≤95kg,配迫降翼后入水深度可达22m。该阵列式磁力测量系统曾被应用于董家口港区某锚地的未爆炸物探测,最终确定了多个疑似物位置。  相似文献   

PM_(2.5)降尘诱导A549细胞G2/M期阻滞的机制研究     

杨洁  霍婷婷  王玉琳  董发勤  曾娅莉  邓建军 《岩石矿物学杂志》2017,36(6):894-902

PM_(2.5)降尘作用于A549细胞后,MTT法检测细胞存活率,扫描电镜观察细胞形态,流式细胞术检测细胞周期改变,RT-PCR检测周期阻滞相关基因p53、p21、CDK1、c-myc和lncRNA H19的表达水平,Western-blot检测周期蛋白cyclin B1表达。通过转染H19 siRNA干扰H19的表达,RT-PCR检测其对p53、c-myc及CDK1表达的影响,以探讨PM2.5降尘诱导A549细胞周期阻滞的作用机制。结果显示,PM2.5降尘暴露可降低A549细胞存活率,随作用浓度及时间增加呈递减趋势,并可观察到细胞形态破坏,细胞膜表面吸附聚集大量粉尘颗粒。PM2.5作用于细胞24 h后,A549细胞增殖阻滞在G2/M期,周期阻滞相关基因p53、p21及H19表达增加,CDK1及cyclin B1表达降低。此外,转染H19 siRNA后成功干扰H19的表达,并调控CDK1表达进一步降低。综合以上结果,PM2.5降尘处理A549细胞后可通过激活p53及p21活性,抑制CDK1和cyclin B1表达水平,诱导G2/M期阻滞从而抑制细胞增殖。短期暴露于PM2.5后,lncRNA H19在染毒细胞中可能发挥特异性癌基因的作用,通过与p53及c-myc结合参与调控细胞周期,干扰H19低表达使细胞G2/M期阻滞更加明显。  相似文献   

SNR G320.4–01.2 and PSR B1509–58: new radio observations of a complex interacting system     

B. M. Gaensler  K. T. S. Brazier  R. N. Manchester  S. Johnston  A. J. Green 《Monthly notices of the Royal Astronomical Society》1999,305(3):724-736

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The role of beach morphology on coastal cliff erosion under extreme waves          下载免费PDF全文

Claire Earlie  Gerhard Masselink  Paul Russell 《地球表面变化过程与地形》2018,43(6):1213-1228

Erosion of hard‐rock coastal cliffs is understood to be caused by a combination of both marine and sub‐aerial processes. Beach morphology, tidal elevation and significant wave heights, especially under extreme storm conditions, can lead to variability in wave energy flux to the cliff‐toe. Wave and water level measurements in the nearshore under energetic conditions are difficult to obtain and in situ observations are rare. Here we use monthly cliff‐face volume changes detected using terrestrial laser scanning alongside beach morphological changes and modelled nearshore hydrodynamics to examine how exposed cliffs respond to changes in extreme wave conditions and beach morphology. The measurements cover the North Atlantic storms of 2013 to 2014 and consider two exposed stretches of coastline (Porthleven and Godrevy, UK) with contrasting beach morphology fronting the cliffs; a flat dissipative sandy beach at Godrevy and a steep reflective gravel beach at Porthleven. Beach slope and the elevation of the beach–cliff junction were found to influence the frequency of cliff inundation and the power of wave–cliff impacts. Numerical modelling (XBeach‐G) showed that under highly energetic wave conditions, i.e. those that occurred in the North Atlantic during winter 2013–2014, with H_s = 5.5 m (dissipative site) and 8 m (reflective site), the combination of greater wave height and steeper beach at the reflective site led to amplified wave run‐up, subjecting these cliffs to waves over four times as powerful as those impacting the cliffs at the dissipative site (39 kWm^‐1 compared with 9 kWm^‐1). This study highlighted the sensitivity of cliff erosion to extreme wave conditions, where the majority (over 90% of the annual value) of cliff‐face erosion ensued during the winter. The significance of these short‐term erosion rates in the context of long‐term retreat illustrates the importance of incorporating short‐term beach and wave dynamics into geomorphological studies of coastal cliff change. © 2017 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.  相似文献   

小型自主水下航行器大容量数据存储设计     

刘颉  梁捷  姜民  杨逍  路亚娟  吕九红 《海洋技术学报》2010,29(1)

在介绍单板机PhyCORE-591和Flash存储器K9K8G08UOM的基础上,解决小型自主水下航行器大容量数据存储问题,并给出PhyCORE-591和K9K8G08UOM使用方法。  相似文献   

在不同应力下石墨烯中拉曼谱的G峰劈裂的变化          下载免费PDF全文

陈东猛 《海洋学报》2010,32(9):6399-6404

应用计及五阶近邻的力常数模型,研究了单轴应力下的石墨烯和芳香烃分子三明治型贴层的石墨烯中拉曼谱的G峰劈裂.计算结果表明对称性的降低解除了G峰对应的在Γ点的面内的纵波光学模声子和横波光学模声子能量简并,从而G峰劈裂为G⁺和G^- 两个峰.在单轴应力作用下,C—C键的伸长致使力常数减小,软化了面内的光学模声子,导致两个G峰都红移;芳香烃分子对石墨烯产生的沿分子长短边方向不同的应力作用,使得G峰对应的两支光学模声子的频率一支发生蓝移,而另一支发生红移.这  相似文献   

基于5G RCS UP1.0标准的天气消息支撑系统设计与实现          下载免费PDF全文

李建  张锋  王伟  陈锦慧  陈冲 《气象科技》2022,50(3):459-466

气象短信服务在气象部门已有十多年的历史并有较广的覆盖面，由于一直以来受运营商传统短信网关的技术能力限制，仅能提供70个字的文字服务。2020年随着三大运营商联合发布《5G消息（5GMC）白皮书》,推出了RCS（Rich Communication Suite, 富媒体通信）,该技术具备融合语音、消息、视频、社区网络等多种功能，为传统短信业务的全面升级提供了技术支撑。本文立足现阶段手机终端普遍支持的RCS UP1.0标准，研究建立“5G天气罗盘制作发布支撑系统”提供以图片、视频等形式的服务内容将天气消息多媒体化，并通过Chatbot的NFS（Network File System）回落技术实现非5G用户以彩信回落的方式接收5G消息，对传统气象短信进行迭代升级，取得了较好的运行效果。  相似文献