On the basis of the airgun source signals recorded by the stations from January,2016 to June,2017,we use cross-correlation detection technology to obtain the characteristics of the stable phase travel time change of e...On the basis of the airgun source signals recorded by the stations from January,2016 to June,2017,we use cross-correlation detection technology to obtain the characteristics of the stable phase travel time change of each station.We used the Yunlong MS5.0 and Yangbi MS5.1 earthquakes as samples.According to regional characteristics,13 stations with high signal-to-noise ratios and complete data were selected(including 3 fixed stations and 10 active source stations).They are divided into four regions,and on the basis of the GNSS baseline data,the characteristics of regional wave velocity changes before and after the earthquake are analyzed.The results show that the station phase travel time change and the regional stress characteristics represented by the GNSS baseline data have good correlation in the short-term.Due to different degrees of regional stress,there are differences in the travel time changes of different stations in the four regions.Before the Yunlong MS5.0 and Yangbi MS5.1 earthquakes,with regional stress adjustment,there is an upward trend in the travel time changes of related stations in the adjacent areas of up to 0.02 s.The difference is that there are differences in the time nodes and duration of the travel time anomalies,and there is a reverse descent process after the Yangbi MS5.1 earthquake.There are different degrees of travel time fluctuations in the relevant stations before and after the two earthquakes,but the fluctuation range before and after the earthquake was small.Compared with the water level change of the reservoir,the adjustment of the regional stress is more likely to have a substantial impact on the travel time changes of the relevant stations.展开更多
目前,依据Alldas.de[注1]网站所显示的资料,在台湾的因特网环境中平均每天至少有10个网站遭受黑客(Hacker)或破坏客(Creaker)破坏或攻击。而这些台湾网站所用的网站服务器软件有80％是采用微软IIS4.0(Internet Information Service)或II...目前,依据Alldas.de[注1]网站所显示的资料,在台湾的因特网环境中平均每天至少有10个网站遭受黑客(Hacker)或破坏客(Creaker)破坏或攻击。而这些台湾网站所用的网站服务器软件有80％是采用微软IIS4.0(Internet Information Service)或IIS5.0网站服务器。这些数据让我们感到震惊,我们有必要出来对抗这些破坏秩序的人。本文就是要提出一些在微软IIS4.0/IIS5.0网站服务器上的防止入策略,希望让一位微软网站系统管理者由“微软的网站服务器真的那么弱吗?”的无奈心态,转化为具有抓出破坏、挑衅者的能力,并培养强有力的防范攻击破坏的防御力。在本文中对于微软的IIS4.0/5.0提供下列6个防止入侵策略:防止入侵策略一:防火墙无法防止网站服务器软件的漏洞防止入侵策略二:养成每日查看。展开更多
基金sponsored by the Yunnan Youth Seismology Science Fund Project(2018k08)the National Natural Science Foundation of China(41574059,41474048)the Science and Technology Special Fund,Yunnan Earthquake Agency(ZX2015-01,2018ZX04)
文摘On the basis of the airgun source signals recorded by the stations from January,2016 to June,2017,we use cross-correlation detection technology to obtain the characteristics of the stable phase travel time change of each station.We used the Yunlong MS5.0 and Yangbi MS5.1 earthquakes as samples.According to regional characteristics,13 stations with high signal-to-noise ratios and complete data were selected(including 3 fixed stations and 10 active source stations).They are divided into four regions,and on the basis of the GNSS baseline data,the characteristics of regional wave velocity changes before and after the earthquake are analyzed.The results show that the station phase travel time change and the regional stress characteristics represented by the GNSS baseline data have good correlation in the short-term.Due to different degrees of regional stress,there are differences in the travel time changes of different stations in the four regions.Before the Yunlong MS5.0 and Yangbi MS5.1 earthquakes,with regional stress adjustment,there is an upward trend in the travel time changes of related stations in the adjacent areas of up to 0.02 s.The difference is that there are differences in the time nodes and duration of the travel time anomalies,and there is a reverse descent process after the Yangbi MS5.1 earthquake.There are different degrees of travel time fluctuations in the relevant stations before and after the two earthquakes,but the fluctuation range before and after the earthquake was small.Compared with the water level change of the reservoir,the adjustment of the regional stress is more likely to have a substantial impact on the travel time changes of the relevant stations.
文摘目前,依据Alldas.de[注1]网站所显示的资料,在台湾的因特网环境中平均每天至少有10个网站遭受黑客(Hacker)或破坏客(Creaker)破坏或攻击。而这些台湾网站所用的网站服务器软件有80％是采用微软IIS4.0(Internet Information Service)或IIS5.0网站服务器。这些数据让我们感到震惊,我们有必要出来对抗这些破坏秩序的人。本文就是要提出一些在微软IIS4.0/IIS5.0网站服务器上的防止入策略,希望让一位微软网站系统管理者由“微软的网站服务器真的那么弱吗?”的无奈心态,转化为具有抓出破坏、挑衅者的能力,并培养强有力的防范攻击破坏的防御力。在本文中对于微软的IIS4.0/5.0提供下列6个防止入侵策略:防止入侵策略一:防火墙无法防止网站服务器软件的漏洞防止入侵策略二:养成每日查看。
