ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operati... more Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operation in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signals. In 2011 the network was formed by nine receivers located three in Italy and one in Austria, Greece, Portugal, Romania, Russia and Turkey. On May 19, 2001 an earthquake with Mw=5.7 occurred in western Turkey, that is inside the "sensitive" area of the network. The radio data collected during April-May 2011 were studied using three different methods of analysis which are the wavelet spectra, the principal component technique and the standard deviation trends. Clear anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in some VLF signals coming from transmitters located in western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursors phases were pointed out. Some ...
In 2009, INFREP, a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers, was put into ... more In 2009, INFREP, a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers, was put into operation in Europe having as principal goal, the study of disturbances produced by the earthquakes on the propagation properties of these signals. On May 22nd, 2012 an earthquake with Mw=567 occurred in Bulgaria, near Sofia, inside the "sensitive" area of the INFREP VLF/LF electromagnetic network. The data collected on different frequencies, during April-May 2012 were studied using different methods of analysis: daily correlation methods, spectral approaches and terminator time techniques, in order to find out possible connections between the seismic activity and the subionospheric propagation properties of radio waves. The studies were performed with the help of a specially designed LabVIEW application, which accesses the VLF/LF receiver through internet. This program opens the receiver's web-page and automatically retrieves the list of data files to synchronize the user-...
In această lucrare este prezentată o platformă de teleoperare prin Internet pentru un dispozitiv ... more In această lucrare este prezentată o platformă de teleoperare prin Internet pentru un dispozitiv de investigare a fluorescenţei induse cu fascicul laser, utilizat în investigarea suprafetelor pictate ale operelor de arta. Partea hardware a sistemului este alcatuită din dispozitivul de investigare transportabil şi un calculator personal utilizat ca şi server şi panou de control. Aplicaţia software utilizează arhitectura Client-Server pentru controlul dispozitivului şi recepţia informaţiilor răspuns. Interfaţa cu utilizatorul este realizată cu ajutorul tehnologiei web-server a platformei LabView. Dispozitivul este operat de la orice distanţă, în timp real, prin intermediul unei pagini web HTML. In this paper it is introduced an internet-based teleoperation platform for a laser induced fluorescence device used in the investigation of the painted surfaces of artworks. The hardware of the system consists of a transportable laser scanning device and a personal computer used as server and ...
Lucrarea prezintă o reţea inteligentă de monitorizare a microclimatului şi calităţii aerului, fol... more Lucrarea prezintă o reţea inteligentă de monitorizare a microclimatului şi calităţii aerului, folosită pentru a identifica impactul acestora asupra componentelor artistice ale clădirilor istorice, muzeelor şi galeriilor de artă. Reţeaua constă dintr-un set de senzori autonomi inteligenţi pentru umiditate relativă şi temperatură care comunică radio cu o unitate centrală care înregistrează, de asemenea, datele de la 6 senzori de gaze poluante. Datele sunt difuzate prin intermediul Internetului. Avantaje importante şi noutăţi: diseminarea datelor şi alarmare în timp real, instalare rapidă în clădirile monitorizate, impact vizual foarte scăzut datorită conectivităţii wireless, uşurinţa de operare, flexibilitate şi accesibilitate. The paper relates to an intelligent network for microclimate and air quality monitoring, used to identify their impact on the artistic components of historical buildings, museums and art galleries. The network consists from a set of autonomous intelligent senso...
Geomagnetic variations associated with earthquakes are widely accepted and several anomalous geom... more Geomagnetic variations associated with earthquakes are widely accepted and several anomalous geomagnetic observations have been interpreted as a result of changing rock magnetic properties under varying tectonic stress (piezomagnetic effect). During the last 15 years of geomagnetic investigations conducted in Vrancea seismogenic zone, period covering more than a complete solar cycle, the solar-terrestrial perturbations have fluctuated from very low to very large values, providing the ideal medium to observe the correlation between the long and short term geomagnetic field perturbations, solar activity and earthquakes. The October 2004 intermediate depth earthquake (Mw=6.0) offered us the opportunity to investigate possible connections between the local geomagnetic field behavior and the occurrence of moderate magnitude Vrancea earthquakes. The comparison between the geomagnetic data obtained at a station inside the epicentral zone with other remote reference stations (outside the ep...
The Romanian VLF/LF monitoring system consisting in a radio receiver and the infrastructure that ... more The Romanian VLF/LF monitoring system consisting in a radio receiver and the infrastructure that is necessary to record and transmit the collected data is part of the European international network named INFREP. Information on electromagnetic fields' intensities created by transmitters at a receiving site are indicating the quality of the propagation along the paths between the receivers and transmitters. Studying the ionosphere's influences on the electromagnetic waves' propagation along a certain path is a method to put into evidence possible modifications of its lower structure and composition as earthquakes' precursors. The VLF/LF receiver installed in Romania was put into operation in February 2009 and has already 3 years of testing, functioning and proving its utility in the forecast of some earthquakes or volcanic eruptions. Simultaneously we monitor, in the same site with the VLF/LF receiver, the vertical atmospheric electric field and different other meteoro...
During 2008 a radio receiver was developed by the Italian factory Elettronika. The receiver is an... more During 2008 a radio receiver was developed by the Italian factory Elettronika. The receiver is an equipment working in VLF (15-60 kHz) and LF (150-300 kHz) bands. It can monitor 10 frequencies distributed in these bands and, for each of them, saves the electric field intensity. During 2009 six receivers were installed for the realization of the "European VLF/LF network". Actually, two of them are into operation in Italy and one in Greece, Turkey, Portugal and Romania, respectively; a sampling rate of 1 minute is used. The LF radio data collected from July 2009 to December 2010 have been analysed. At first, for each radio signal, the day time data and the night time ones were separated. Taking into account that the LF signals are characterized by the ground wave and the sky wave propagation modes, the day data are related to the ground wave and the night data to the sky wave. In a first analysis the effect of the solar activity and of the thunderstorm activity was pointed o...
Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operati... more Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operation in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signals. In 2011 the network was formed by nine receivers located three in Italy and one in Austria, Greece, Portugal, Romania, Russia and Turkey. On May 19, 2001 an earthquake with Mw=5.7 occurred in western Turkey, that is inside the "sensitive" area of the network. The radio data collected during April-May 2011 were studied using three different methods of analysis which are the wavelet spectra, the principal component technique and the standard deviation trends. Clear anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in some VLF signals coming from transmitters located in western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursors phases were pointed out. Some ...
ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
The paper was generated by the identified needs for improved conservation strategy and long life ... more The paper was generated by the identified needs for improved conservation strategy and long life professional training, particularly for science conservators, art historians, restorers and conservators, and equally contributes to: i) new education instruments for on-line ...
The paper presents the Romanian VLF / LF monitoring system consisting in a radio receiver -made b... more The paper presents the Romanian VLF / LF monitoring system consisting in a radio receiver -made by Elettronika S.R.L. (Italy) and provided by the Bari University- and the infrastructure that is necessary to record and transmit the collected data. This system is a part of the international initiative INFREP. Through this initiative, originated in Italy, VLF / LF receivers are deployed in different locations in Europe. Each one is monitoring up to ten different transmissions of radio stations across the continent. Information on electromagnetic fields' intensities created by transmitters at each receiving site and gathered from this network are indicating the quality of the propagation along the paths between the receivers and transmitters. Studying the ionosphere's influences on the electromagnetic waves' propagation along a certain path is a method to put into evidence possible modifications of its lower structure and composition as earthquakes' precursors. The V...
... panels. The data acquisition system is based on the Seiscomp3 software; a sampling rate of 10... more ... panels. The data acquisition system is based on the Seiscomp3 software; a sampling rate of 100 samples per second is applied for BB seismic instruments and accelerometers, whilst for the infrasound sensor a 20 sps rate is used. ...
The present paper presents a CO2 laser system that works in the IR region of the spectrum (10.6 μ... more The present paper presents a CO2 laser system that works in the IR region of the spectrum (10.6 μm), and that can be used for measurement and analysis of mechanical vibrations from high distances. The system utilizes the Doppler shift due to surface motion, and the frequency structure of the reflected light is obtained from the spectrum of the photocurrent
ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operati... more Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operation in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signals. In 2011 the network was formed by nine receivers located three in Italy and one in Austria, Greece, Portugal, Romania, Russia and Turkey. On May 19, 2001 an earthquake with Mw=5.7 occurred in western Turkey, that is inside the "sensitive" area of the network. The radio data collected during April-May 2011 were studied using three different methods of analysis which are the wavelet spectra, the principal component technique and the standard deviation trends. Clear anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in some VLF signals coming from transmitters located in western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursors phases were pointed out. Some ...
In 2009, INFREP, a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers, was put into ... more In 2009, INFREP, a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers, was put into operation in Europe having as principal goal, the study of disturbances produced by the earthquakes on the propagation properties of these signals. On May 22nd, 2012 an earthquake with Mw=567 occurred in Bulgaria, near Sofia, inside the "sensitive" area of the INFREP VLF/LF electromagnetic network. The data collected on different frequencies, during April-May 2012 were studied using different methods of analysis: daily correlation methods, spectral approaches and terminator time techniques, in order to find out possible connections between the seismic activity and the subionospheric propagation properties of radio waves. The studies were performed with the help of a specially designed LabVIEW application, which accesses the VLF/LF receiver through internet. This program opens the receiver's web-page and automatically retrieves the list of data files to synchronize the user-...
In această lucrare este prezentată o platformă de teleoperare prin Internet pentru un dispozitiv ... more In această lucrare este prezentată o platformă de teleoperare prin Internet pentru un dispozitiv de investigare a fluorescenţei induse cu fascicul laser, utilizat în investigarea suprafetelor pictate ale operelor de arta. Partea hardware a sistemului este alcatuită din dispozitivul de investigare transportabil şi un calculator personal utilizat ca şi server şi panou de control. Aplicaţia software utilizează arhitectura Client-Server pentru controlul dispozitivului şi recepţia informaţiilor răspuns. Interfaţa cu utilizatorul este realizată cu ajutorul tehnologiei web-server a platformei LabView. Dispozitivul este operat de la orice distanţă, în timp real, prin intermediul unei pagini web HTML. In this paper it is introduced an internet-based teleoperation platform for a laser induced fluorescence device used in the investigation of the painted surfaces of artworks. The hardware of the system consists of a transportable laser scanning device and a personal computer used as server and ...
Lucrarea prezintă o reţea inteligentă de monitorizare a microclimatului şi calităţii aerului, fol... more Lucrarea prezintă o reţea inteligentă de monitorizare a microclimatului şi calităţii aerului, folosită pentru a identifica impactul acestora asupra componentelor artistice ale clădirilor istorice, muzeelor şi galeriilor de artă. Reţeaua constă dintr-un set de senzori autonomi inteligenţi pentru umiditate relativă şi temperatură care comunică radio cu o unitate centrală care înregistrează, de asemenea, datele de la 6 senzori de gaze poluante. Datele sunt difuzate prin intermediul Internetului. Avantaje importante şi noutăţi: diseminarea datelor şi alarmare în timp real, instalare rapidă în clădirile monitorizate, impact vizual foarte scăzut datorită conectivităţii wireless, uşurinţa de operare, flexibilitate şi accesibilitate. The paper relates to an intelligent network for microclimate and air quality monitoring, used to identify their impact on the artistic components of historical buildings, museums and art galleries. The network consists from a set of autonomous intelligent senso...
Geomagnetic variations associated with earthquakes are widely accepted and several anomalous geom... more Geomagnetic variations associated with earthquakes are widely accepted and several anomalous geomagnetic observations have been interpreted as a result of changing rock magnetic properties under varying tectonic stress (piezomagnetic effect). During the last 15 years of geomagnetic investigations conducted in Vrancea seismogenic zone, period covering more than a complete solar cycle, the solar-terrestrial perturbations have fluctuated from very low to very large values, providing the ideal medium to observe the correlation between the long and short term geomagnetic field perturbations, solar activity and earthquakes. The October 2004 intermediate depth earthquake (Mw=6.0) offered us the opportunity to investigate possible connections between the local geomagnetic field behavior and the occurrence of moderate magnitude Vrancea earthquakes. The comparison between the geomagnetic data obtained at a station inside the epicentral zone with other remote reference stations (outside the ep...
The Romanian VLF/LF monitoring system consisting in a radio receiver and the infrastructure that ... more The Romanian VLF/LF monitoring system consisting in a radio receiver and the infrastructure that is necessary to record and transmit the collected data is part of the European international network named INFREP. Information on electromagnetic fields' intensities created by transmitters at a receiving site are indicating the quality of the propagation along the paths between the receivers and transmitters. Studying the ionosphere's influences on the electromagnetic waves' propagation along a certain path is a method to put into evidence possible modifications of its lower structure and composition as earthquakes' precursors. The VLF/LF receiver installed in Romania was put into operation in February 2009 and has already 3 years of testing, functioning and proving its utility in the forecast of some earthquakes or volcanic eruptions. Simultaneously we monitor, in the same site with the VLF/LF receiver, the vertical atmospheric electric field and different other meteoro...
During 2008 a radio receiver was developed by the Italian factory Elettronika. The receiver is an... more During 2008 a radio receiver was developed by the Italian factory Elettronika. The receiver is an equipment working in VLF (15-60 kHz) and LF (150-300 kHz) bands. It can monitor 10 frequencies distributed in these bands and, for each of them, saves the electric field intensity. During 2009 six receivers were installed for the realization of the "European VLF/LF network". Actually, two of them are into operation in Italy and one in Greece, Turkey, Portugal and Romania, respectively; a sampling rate of 1 minute is used. The LF radio data collected from July 2009 to December 2010 have been analysed. At first, for each radio signal, the day time data and the night time ones were separated. Taking into account that the LF signals are characterized by the ground wave and the sky wave propagation modes, the day data are related to the ground wave and the night data to the sky wave. In a first analysis the effect of the solar activity and of the thunderstorm activity was pointed o...
Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operati... more Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers was put into operation in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signals. In 2011 the network was formed by nine receivers located three in Italy and one in Austria, Greece, Portugal, Romania, Russia and Turkey. On May 19, 2001 an earthquake with Mw=5.7 occurred in western Turkey, that is inside the "sensitive" area of the network. The radio data collected during April-May 2011 were studied using three different methods of analysis which are the wavelet spectra, the principal component technique and the standard deviation trends. Clear anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in some VLF signals coming from transmitters located in western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursors phases were pointed out. Some ...
ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-... more ABSTRACT In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a 'European VLF/LF Network'. At present, two of these are into operation in Italy, and the remaining four are located in Greece, Turkey, Portugal and Romania. For the present study, the LF radio data collected over about two years were analysed. At first, the day-time data and the night-time data were separated for each radio signal. Taking into account that the LF signals are characterized by ground-wave and sky-wave propagation modes, the day-time data are related to the ground wave and the night-time data to the sky wave. In this framework, the effects of solar activity and storm activity were defined in the different trends. Then, the earthquakes with M ≥5.0 that occurred over the same period were selected, as those located in a 300-km radius around each receiver/transmitter and within the 5th Fresnel zone related to each transmitter-receiver path. Where possible, the wavelet analysis was applied on the time series of the radio signal intensity, and some anomalies related to previous earthquakes were revealed. Except for some doubt in one case, success appears to have been obtained in all of the cases related to the 300 km circles in for the ground waves and the sky waves. For the Fresnel cases, success in two cases and one failure were seen in analysing the sky waves. The failure occurred in August/September, and might be related to the disturbed conditions of the ionosphere in summer
The paper was generated by the identified needs for improved conservation strategy and long life ... more The paper was generated by the identified needs for improved conservation strategy and long life professional training, particularly for science conservators, art historians, restorers and conservators, and equally contributes to: i) new education instruments for on-line ...
The paper presents the Romanian VLF / LF monitoring system consisting in a radio receiver -made b... more The paper presents the Romanian VLF / LF monitoring system consisting in a radio receiver -made by Elettronika S.R.L. (Italy) and provided by the Bari University- and the infrastructure that is necessary to record and transmit the collected data. This system is a part of the international initiative INFREP. Through this initiative, originated in Italy, VLF / LF receivers are deployed in different locations in Europe. Each one is monitoring up to ten different transmissions of radio stations across the continent. Information on electromagnetic fields' intensities created by transmitters at each receiving site and gathered from this network are indicating the quality of the propagation along the paths between the receivers and transmitters. Studying the ionosphere's influences on the electromagnetic waves' propagation along a certain path is a method to put into evidence possible modifications of its lower structure and composition as earthquakes' precursors. The V...
... panels. The data acquisition system is based on the Seiscomp3 software; a sampling rate of 10... more ... panels. The data acquisition system is based on the Seiscomp3 software; a sampling rate of 100 samples per second is applied for BB seismic instruments and accelerometers, whilst for the infrasound sensor a 20 sps rate is used. ...
The present paper presents a CO2 laser system that works in the IR region of the spectrum (10.6 μ... more The present paper presents a CO2 laser system that works in the IR region of the spectrum (10.6 μm), and that can be used for measurement and analysis of mechanical vibrations from high distances. The system utilizes the Doppler shift due to surface motion, and the frequency structure of the reflected light is obtained from the spectrum of the photocurrent
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Papers by Adrian Septimiu Moldovan