Response characteristics of electromagnetic seismographs and their dependence on the instrumental constants

1949 ◽  
Vol 39 (3) ◽  
pp. 205-218
Author(s):  
S. K. Chakrabarty
Keyword(s):  
General Solution ◽  
Equation Of Motion ◽  
Harmonic Motion ◽  
Response Characteristics ◽  
Local Earthquakes ◽  
Simple Harmonic Motion ◽  
The Earth ◽  
Electromagnetic Seismograph ◽  
Different Types ◽  
Proper Values

Summary The equation of motion of the seismometer and the galvanometer in an electromagnetic seismograph has been derived in the most general form taking into consideration all the forces acting on the system except that produced by hysteresis. A general solution has been derived assuming that the earth or the seismometer frame is subjected to a sustained simple harmonic motion, and expressions for both the transient and the steady term in the solution have been given. The results for the particular case when the seismograph satisfies the Galitzin conditions can easily be deduced from the results given in the present paper. The results can now be used to study the response characteristics of all electromagnetic seismographs, whether they satisfy the Galitzin conditions or not, and will thus give an accurate theoretical picture of the response also of seismographs used for the study of “local earthquakes” and “microseisms” which do not in general obey the Galitzin conditions. The results obtained can also be used to get analytically the response of the seismographs for different types of earth motion from the very beginning, and not only after the transient term has disappeared. The theory of the response to simple tests used to determine the dynamic magnification of any seismograph and also to determine and check regularly the instrumental constants of the seismographs has been worked out. The results obtained can also be used for ascertaining the proper values of the instrumental constants suitable for the various purposes for which the seismographs are to be used.

scholarly journals Introduction to the Special Issue “Radiative Transfer in the Earth Atmosphere”

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 479
Author(s):  
Irina Sokolik
Keyword(s):  
Radiative Transfer ◽  
Earth Atmosphere ◽  
Special Issue ◽  
The Earth ◽  
Radiative Impact ◽  
Different Types ◽  
Recent Developments

This Special Issue aims at addressing the recent developments towards improving our understanding of the diverse radiative impact of different types of aerosols and clouds [...]

TPT NOTES: Damped Simple Harmonic Motion on a Linear Air Track

1969 ◽  
Vol 7 (7) ◽  
pp. 395-396
Author(s):  
Thomas B. Greenslade
Keyword(s):  
Harmonic Motion ◽  
Simple Harmonic Motion

Magnification curves of electromagnetic seismographs

1964 ◽  
Vol 54 (5A) ◽  
pp. 1459-1471
Author(s):  
S. K. Chakrabarty ◽  
G. C. Choudhury ◽  
S. N. Roy Choudhury
Keyword(s):  
General Solution ◽  
Frequency Response ◽  
Experimental Method ◽  
Phase Shifts ◽  
Response Curves ◽  
Operating Condition ◽  
Coil Inductance ◽  
The World ◽  
Electromagnetic Seismograph ◽  
Proper Design

Abstract The general solution of the equations connecting the motion of the two coupled components in an electromagnetic seismograph has been obtained in another paper and it shows that the magnification of a seismograph depend on seven instrumental constants. Using these results, equations and curves have been derived in the present paper from which the Magnification as well as Phase shifts in the response of a seismograph and their variations with damping and coil inductance can be easily obtained. Based on these curves a number of magnification curves for different combinations, which are in operation at the different seismological stations of the world, have been derived. Suitable equations and curves have also been obtained which can be used for estimating the absolute Magnification of a Seismograph. An experimental method of obtaining the frequency response curves of seismographs in their operating condition has been described and the results obtained by this method has been given. It has been indicated how the results incorporated in the present paper can be used in the proper design of seismographs required for the different purposes.

Dynamic Characteristics of a Hydrostatic Gas Bearing Driven by Oscillating Exhaust Pressure

1984 ◽  
Vol 106 (4) ◽  
pp. 477-483 ◽  
Author(s):  
C. B. Watkins ◽  
H. D. Branch ◽  
I. E. Eronini
Keyword(s):  
Reynolds Equation ◽  
Numerical Solutions ◽  
Equations Of Motion ◽  
Equation Of Motion ◽  
Source Model ◽  
Regular Perturbation ◽  
Response Characteristics ◽  
Finite Difference Approximations ◽  
Bode Plots ◽  
Gas Bearing

Vibration of a statically loaded, inherently compensated hydrostatic journal bearing due to oscillating exhaust pressure is investigated. Both angular and radial vibration modes are analyzed. The time-dependent Reynolds equation governing the pressure distribution between the oscillating journal and sleeve is solved together with the journal equation of motion to obtain the response characteristics of the bearing. The Reynolds equation and the equation of motion are simplified by applying regular perturbation theory for small displacements. The numerical solutions of the perturbation equations are obtained by discretizing the pressure field using finite-difference approximations with a discrete, nonuniform line-source model which excludes effects due to feeding hole volume. An iterative scheme is used to simultaneously satisfy the equations of motion for the journal. The results presented include Bode plots of bearing-oscillation gain and phase for a particular bearing configuration for various combinations of parameters over a range of frequencies, including the resonant frequency.

Simple harmonic motion

2019 ◽  
pp. 262-268
Author(s):  
John Bird ◽  
Carl Ross
Keyword(s):  
Harmonic Motion ◽  
Simple Harmonic Motion

scholarly journals Cosmogonies and mythopoesis in the Balkans and beyond

2014 ◽  
Vol 14 ◽  
pp. 87-147 ◽  
Author(s):  
Florentina Badalanova Geller
Keyword(s):  
Oral Tradition ◽  
18Th Century ◽  
The Balkans ◽  
Biblical Literature ◽  
The Earth ◽  
Different Types ◽  
To Come ◽  
Academy Of Sciences ◽  
First Time ◽  
The Devil

Cosmogonies and mythopoesis in the Balkans and beyondCompared and contrasted in this article are three different types of accounts dealing with the cosmogonic and eschatological themes employed in Slavonic and Balkan oral tradition, para-Biblical literature and modern poetry. The focus of analysis is the cluster of motifs attested in the creation narrative of the apocryphal Legend of the Sea of Tiberias. Two versions are examined: the South-Slavonic one discovered in 1845 by V. Grigorovich in the Monastery of Slepche, and the 18th century Russian account from MS № 21.11.3 (fols. 3a–5b) from the Archaeographic Department of the Library of the Academy of Sciences [Библиотека Академии наук, Рукописный отдел] in St. Petersburg, composed most probably by an Old Believer; this manuscript is published here for the first time. Folklore counterparts of the apocryphal Legend of the Sea of Tiberias are treated, with special emphasis on the oral narratives from the Bulgarian diaspora in Bessarabia (God and the Devil Create the World Amicably but then Fall Out). Finally, a poem of the 20th century Bulgarian intellectual Pencho Slaveykov [Пенчо Славейков] from his anthology “On the Island of the Blessed” is discussed; the poem, entitled How God willed the Earth to come to be and what did Satanail do after that? was designated by Slaveykov himself as “a legend of the Bogomils”, and blended within his lyrics are dualistic themes and motifs attested in vernacular Christianity, with the hallmark of Haeresis Bulgarica. Kosmogonie i mitopoetyki na Bałkanach i nie tylkoW artykule zostały porównane trzy typy narracji zawierających wątki kosmogoniczne i eschatologiczne, które funkcjonują w słowiańskiej i bałkańskiej tradycji ustnej, literaturze parabiblijnej oraz poezji doby modernizmu. Przedmiotem uwagi stała się grupa motywów poświadczonych w narracji o stworzeniu, znanej z Legendy o Morzu Tyberiadzkim. Analizom poddane zostały dwie wersje: południowosłowiańska, odkryta w 1845 roku przez W. Grigorowicza w Monastyrze w Slepče, oraz ruska – z XVIII wieku, znajdująca się w kodeksie MS № 21.11.3 (fols. 3a–5b), przechowywanym w Oddziale Rękopisów Biblioteki Akademii Nauk w Sankt Petersburgu – skomponowana najprawdopodobniej w środowisku staroobrzędowców (rękopis ten jest tu publikowany po raz pierwszy). Następnie przeprowadzona została analiza odpowiedników folklorystycznych apokryficznej Legendy o Morzu Tyberiadzkim, ze szczegól­nym uwzględnieniem narracji ustnych funkcjonujących w bułgarskiej diasporze w Besarabii (Bóg i Diabeł tworzą świat w przyjaźni ale potem stają się wrogami). Na końcu został poddany interpretacji poemat z XX wieku autorstwa bułgarskiego modernisty Penczo Sławejkowa [Пенчо Славейков] z antologii Na wyspie błogosławionych [На острова на блажените]; poemat ten, zatytułowany Jak Bóg zezwolił, aby powstała ziemia i co potem uczynił Satanael?, został nazwany przez samego autora „legendą Bogomiłów”, i skompilowany w jego tekstach z dualistycznymi motywami występującymi w chrześcijaństwie tego regionu, a rozpoznawa­nymi jako haeresis bulgarica.

scholarly journals Hitek és tévhitek a növényi alapú étrendről egy online kutatás eredményei alapján

2020 ◽  
Vol 7 (2) ◽  
pp. 65-77
Author(s):  
Veronika Keller ◽  
◽  
Viktória Bocsková ◽  
Keyword(s):  
Social Media ◽  
Online Survey ◽  
Healthy Lifestyle ◽  
Current Trend ◽  
Psychological Effects ◽  
Fruit And Vegetables ◽  
Online Social Media ◽  
Significant Relationships ◽  
The Earth ◽  
Different Types

A main current trend is healthy lifestyle and the consumption of fruit and vegetables. The assessment of healthiness of plant-based diet is not so obvious either among the population or food experts. In an online survey the knowledge, beliefs and misbeliefs about plant-based diet were analysed among members and non-members of online social media lifestyles groups. All in all, it can be stated that there are no significant relationships and differences between knowledge, attitude and perception of members and non-members. Social media users are aware of the different types of plant-based diet (vegetarian, vegan) and the positive and negative psychological effects. The associations connected to plant-based diet are the following: healthy, environmentally friendly and expensive. Only a small segment of Hungarian people follow plant-based diet. At the same the diverse and everyday consumption of fruit and vegetables is essential because of health and sustainability issues. Due to conscious nutrition and more plant-based diet, people can contribute to the protection of their own health and the Earth.

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