基于声学调制解调器的声速剖面遥测技术

声速是海洋声呐测量中最重要的声学参数之一。拖缆式声速剖面仪可提供实时测量功能,但其缆长不能满足深海测量要求;自容式声速剖面仪可满足深海测量要求,但工作效率低。如何提高野外深海声速剖面测量工作效率是深海调查一项非常有意义的工作。文中详细介绍了基于声学调制解调器的声速剖面遥测系统的主要结构和功能,揭示了水声通信技术在深海非铠装缆测量中的应用优势。     

基于拨号网络的跨操作系统平台互联一例

介绍了两台计算机之间通过电话线和Modem互联通讯的原理及应用，详细论述了在这种组网方式下如何通过SLIP协议(或PPP协议)实现SCO UNIX主机和Windows主机、SCO UNIX主机相连来实现文件的远程传输，并提出解决方案，给出实例。     

直接用电脑发送报文的方法

利用调制解调器 (ＭＯＤＥＭ )在计算机上直接发送气象报文 ,比用普通的传真机清晰、快速 ,操作简便 ,并具有自动重拨等优点。1　实现的条件1 1　硬　件带传真功能的ＭＯＤＥＭ、计算机各一台 ,电话市话线路一对。1 2　软　件安装ＷＩＮＤＯＷＳ95中的ＭＩＣＲＯＳＯＦＴ传真(因ＷＩＮＤＯＷＳ98没有此项 ,所以如要在ＷＩＮ ＤＯＷＳ98下使用 ,必须先安装ＷＩＮＤＯＷＳ95 ,并选ＭＩＣＲＯＳＯＦＴ传真 ,再升级到ＷＩＮＤＯＷＳ98)或用ＦａｘＷｏｒｋｓ、ＢｉｔＷａｒｅ……等传真软件。2　实现的方法2 1　测报软件在ＷＩＮＤＯＷＳ9Ｘ下…     

Growth patterns and dynamics of mud cracks at different diagenetic stages and its geological significance

This paper discusses the growth stages,spatial structures,quantitative fitting relationships among various parameters,growth patterns and influencing factors of mud cracks by field survey,core observation and SEM analysis.The study shows that:(1) Mud crack growth can go through three stages,i.e.the syndiagenetic stage,the burial diagenetic stage(including early diagenetic stage,middle-late diagenetic stage) and the epidiagenetic stage.(2) Quantitative fitting relationships among various parameters allow a great significance to describe the spatial structure,the regional distribution and the growth environment of mud cracks.(3) Mud crack growth has three models,such as the unilateral growth model including the linear growth pattern,the curvilinear growth pattern and the bifurcation growth pattern,the multilateral growth model including the inteisectional growth pattern,the join growth pattern and the dispersed growth pattern,and the mixed growth model including the combination of any patterns listed above.(4) Modern mud crack growth usually undergoes four stages.Sand beds in sand-mud rhythmic strata can play a lubricative role on crack growth and provide enough sandy deposits for filling cracks.(5) Mud crack growth usually produces bifurcation and bifurcation angles which are mostly 120° or 90° that are related to sediment heterogeneity and released energy.(6)Factors affecting mud crack growth cover many aspects:clay content and salinity can control the number of mud cracks in different areas;terrain can control mud crack morphology;and different sedimentary cycles can control the growth patterns and filling models of mud cracks.     

高频频率合成器

本文详细介绍了GDFM－97无线调制解调器中新采用的高频频率合成器的理论基础、电路原理及具体的设置方法等。     

Modeling experimental study on weathering-leaching of Emeishan basalt and its relation with metallogenesis

The Emeishan basalt has a high Cu background value (170×10-6 on average), and thus provides a ore-forming material source for copper ores. The collected samples were exposed in basalt lavas of the third segment of the Emeishan basalt eruptive cycle. By using a set of automatically cycling glass apparatuses, weathering-leaching experiments by three kinds of rainwater on the collected samples were carried out in the open system (at normal temperature and normal pressure). The analysis results showed that the most intensive export of Cu occurred under acidic rainwater-induced weathering-leaching conditions, almost 2-3 orders of magnitude the export of Cu by modern air rainwater, and 1-2 orders of magnitude higher than the export of Cu by CO2 rainwater. In addition, the total amount of Zn, Cu, U, Ni and Sr exported by acidic rainwater are greater than 1%. All this indicates that copper in the Emeishan basalt provided the copper source for Cu mineralization at the contact between the basalt and the Maokou Formation limestone at the bottom.     

GDFM-97无线调制解调器

随着数据通信技术的发展及“九五”遥测地震台网数字化改造的需要 ,我们研制了GDFM-97无线调制解调器 (以下简称 GDFM-97)。该设备于 1 998年 5月通过了国家地震局科技监测司组织的有关专家的验收。并在国内外进行了推广应用。实践证明该设备具有良好的适应性 ,其在功能和性能方面优于国内同类产品。GDFM-97是远距离传输数字信号的无线信道设备 ,可用于点对点的无线双向数据传输 ,且只占用单个高频频点 ,特别适合于数字地震信号传输 ,端口速率为 4 80 0 bps,信道速率为 960 0 bps。1　工作原理GDFM97由以下几个单元构成 :系统控制单…     

调制解调器在自动气象站的应用

已经建成的“西汉高速公路气象保障服务系统”中自动气象监测站网是由14个5要素(温度、湿度、降水、风向、风速)自动气象站与中心站组成,设备采用长春气象仪器厂DYYZⅡ型仪器,已有2 a不间断运行状况记录,自动气象监测站网运行状况表明:自动气象站电源供电系统故障率较高,采集器     

县、市、省三级气象信息自动传输系统

气象信息自动传输系统通过借助无线电台和有线电路，利用微机和调制解调器，可以实现县、市、省三级气象信息的自动传输。作者较为详细地说明了该系统硬件的安装方法，给出了有关的电路图和程序设计框图，并简要地介绍了系统的主要功能。     

信息高速公路数据接入技术及对我院校园网规划的设想

全面介绍了现代信息高速公路中的各种数据接入技术及其发展状况,并对我院校园网数据接入提出了一些设想。