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1 前 言 在Internet的推动和影响下,TCP/IP协议已经成为当今网络的主协议,气象部门9210工程计算机网络也不例外地采用了TPC/IP协议,广东省气象部门现在正使用的DECnet协议将很快被取代。在TCP/IP网络环境下,可以在程序中调用外部应用程序FTP(FileTransportProtocol文件传送协议)客户端软件来实现文件传送,这种方法使用很简单,缺点在于无法获得文件传送的状态和进展情况,该缺点在远程大文件传输过程中就更显突出。因为远程大文件传输需要较长时间,如果在程序中… 相似文献
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1前言目前,气象台站的磁盘气象资料文件,主要有两种:一是整编的磁盘资料表格文件,表格文件的扩展名为TAB,本文称为TAB文件,TAB文件共有140多个气象要素,基本满足中长期预报的需要。我省台站的磁盘资料表格文件,目前只有建站到1990年的资料。另一种是气表-1的磁盘资料文件,其文件名的开头为A0或D,本文称为A0文件或D文件。上述两种资料文件,都是顺序文件。为了便于气象台站对用户进行资料服务,便于预报员制作长中短期预报时调用磁盘气象资料,下面介绍一个气象资料管理系统,其主要功能是:能从TAB文件、AO或D文件转换产… 相似文献
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通过对现有气象警报系统现状及现有无线寻呼现状的分析,指出各自的弊端和所处的窘境,同时认为语音寻呼将是未来的发展方向。 相似文献
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采用deph i6.0编程语言,开发了南阳所辖12县(市)天气加密报报文自动转换为“12121”天气实况语音的处理软件,并提供了故障处理功能。 相似文献
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背景噪声对语音信号的基音周期提取有很大的影响.结合能够对背景噪声进行有效降噪的EMD(Empirical Mode Decomposition)软阈值法,提出了一种噪声背景下语音基音周期提取的方法.首先将EMD软阈值降噪法和中心削波法相结合,对信号进行预处理,然后利用语音信号波形本身的信息,进行波形之间的匹配估计,从而获得准确的语音信号基音周期.仿真实验表明:与传统的基音周期提取方法相比较,所提方法在基音周期提取的准确度方面有很大的提高. 相似文献
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介绍了如何通过Internet的Email传送小型文件的思路,并提供了邮件发送和接收的程序,开发出的相应程序,已在业务上使用,效果较好。 相似文献
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Yong L. McHall 《大气科学进展》1993,10(4):407-414
It has been argued in Part I that traditional expression of multidimensional group velocity used in meteorology is only applicable for isotropic waves. While for anisotropic waves, it cannot manifest propagation of waves group along the trajectory of a reference wave point, and varies with rotation of coordinates. The general mathematical ex-pression of group velocity which may be used also for anisotropic waves has been derived in Part I. It will be proved that the mean wave energy, momentum and wave action density are all conserved as a wave group propagates at the general group velocity. Since general group velocity represents the movement of a reference point in either isotropic or anisotropic wave trains, it may be used to define wave rays. The variations of wave parameters along the rays in a slowly varying environment are represented by ray-tracing equations. Using the general group velocity, we may de-rive the anisotropic ray-tracing equations, which give the traditional ray-tracing equations for isotropic waves. 相似文献
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Previously validated model results were used to characterize the wave climate over the Southern Brazilian Shelf (SBS). The low mean significant wave height over the western South Atlantic shelves was shown together with examples of cyclone-induced extreme wave fields and other typical wave conditions. The mean offshore spectra showed a bimodal shape with a predominance of S/SSW and ENE/E waves with distinctive interannual rising periods in wave energy density. Along-shelf wave energy gradients were seen near the coast with higher energy located off capes and coastal projections and energy minima between them. A considerable drop in wave energy suggests the 40 m depth as the mean wave base and consequently the lower limit of the SBS shoreface. The upper shoreface mean wave energy density varied abruptly along the shelf in response to differences in bottom declivities. The large and shallow shoreface was responsible for an intense refraction of the waves and hence very small angles of attack. Additionally, it was shown the sheltering effect caused by capes and coastal projections and a remarkable north/south energy asymmetry between them, caused by a windowing on the wave propagation to the shore. Altogether, it was possible to state that bottom friction plays a major role in wave differentiation along the SBS shoreface, thus suggesting that shelf morphology might indeed be more important to generate wave variability than the offshore wave variation itself. 相似文献
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气象信息综合分析处理系统(英文编写为MICAPS)是中国气象局9210的一个子.经负责业务气象资料的处理和显示,是业务预报员的基本工作平台。MICAPS系统分为工作站版和微机版,其中微机版应用于全国省、地、县三级气象台站。为此,MICAPS系统开发组首先开发了MICAPS系统中文版安装程序。随着MICAPS系统应用范围的扩大,MICAPS系统开发组又开发了MICAPS系统英文版安装程序。文章着重介绍目前国内广泛使用的中文版安装的使用方法和技巧,并对MICAPS系统中英文安装程序所使用两种开发软件的特性做出简要比较,旨在使MICAPS用户对MICAPS系统安装程序有一深入的了解,同时对从事安装程序制作的开发人员有一定的帮助和借鉴作用。 相似文献
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介绍了NO.7信令在12121气象声讯系统上的调试、应用情况,并通过实例分析了7号信令语音卡上OPC、DPC、时隙、CIC等参数设置规则及操作步骤. 相似文献
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本文提出可以用平均限制性变分原理来研究非均匀基流中地形对Rossby波的影响。所得到的结果与用多重尺度法相一致,但却避免了多重尺度法中的冗繁运算,而且物理意义更加清楚,诸如波作用量密度、波能密度等物理量的定义也更自然、合理。 相似文献