scholarly journals Meteoroid velocity distribution derived from head echo data collected at Arecibo during regular world day observations

2004 ◽  
Vol 4 (4) ◽  
pp. 947-954 ◽  
Author(s):  
M. P. Sulzer
Keyword(s):  
Velocity Distribution ◽  
Ecliptic Plane ◽  
Statistical Interpretation ◽  
Measured Velocity ◽  
Directional Information ◽  
The Earth ◽  
Slow Part ◽  
Head Echo ◽  
To Come ◽  
New Perspective

Abstract. We report the observation and analysis of ionization flashes associated with the decay of meteoroids (so-called head echos) detected by the Arecibo 430 MHz radar during regular ionospheric observations in the spring and autumn equinoxes. These two periods allow pointing well-above and nearly-into the ecliptic plane at dawn when the event rate maximizes. The observation of many thousands of events allows a statistical interpretation of the results, which show that there is a strong tendency for the observed meteoroids to come from the apex as has been previously reported (Chau and Woodman, 2004). The velocity distributions agree with Janches et al. (2003a) when they are directly comparable, but the azimuth scan used in these observations allows a new perspective. We have constructed a simple statistical model which takes meteor velocities as input and gives radar line of sight velocities as output. The intent is to explain the fastest part of the velocity distribution. Since the speeds interpreted from the measurements are distributed fairly narrowly about nearly 60 km s-1, double the speed of the earth in its orbit, is consistent with the interpretation that many of the meteoroids seen by the Arecibo radar are moving in orbits about the sun with similar parameters as the earth, but in the retrograde direction. However, it is the directional information obtained from the beam-swinging radar experiment and the speed that together provide the evidence for this interpretation. Some aspects of the measured velocity distributions suggest that this is not a complete description even for the fast part of the distribution, and it certainly says nothing about the slow part first described in Janches et al. (2003a). Furthermore, we cannot conclude anything about the entire dust population since there are probably selection effects that restrict the observations to a subset of the population.

scholarly journals Meteor science from regular incoherent scatter radar ionospheric observations at Arecibo

2004 ◽  
Vol 4 (1) ◽  
pp. 805-831 ◽  
Author(s):  
M. P. Sulzer
Keyword(s):  
Event Rate ◽  
Ecliptic Plane ◽  
Line Of Sight ◽  
Statistical Interpretation ◽  
Measured Velocity ◽  
Incoherent Scatter ◽  
The Earth ◽  
Slow Part ◽  
To Come ◽  
New Perspective

Abstract. We report the observation and analysis of ionization flashes associated with the decay of meteoroids (so-called head echos) detected by the Arecibo 430 MHz radar during regular ionospheric observations in the spring and autumn equinoxes. These two periods allow pointing well-above and nearly-into the ecliptic plane at dawn when the event rate maximizes. The observation of many thousands of events allows a statistical interpretation of the results, which show that there is a strong tendency for the observed meteoroids to come from the apex as has been previously reported (Chau and Woodman, 2003). The velocity distributions agree with Janches et al. (2003) when they are directly comparable, but the azimuth scan used in these observations allows a new perspective. We have constructed a simple statistical model which takes meteor velocities as input and gives radar line of sight velocities as output. The intent is to explain the fastest part of the velocity distribution. Since the speeds interpreted from the measurements are distributed fairly narrowly about nearly 60 km/s−1, double the speed of the earth in its orbit, the obvious interpretation is that many of the meteoroids seen by the Arecibo radar are moving in orbits about the sun with similar parameters as the earth, but in the retrograde direction. However, some aspects of the measured velocity distributions suggest that this is not a complete description even for the fast part of the distribution, and it certainly says nothing about the slow part first described in Janches et al. (2003). Furthermore, we cannot conclude anything about the entire dust population since there are probably selection effects that restrict the observations to a subset of the population.

Experimental Characterization of Slug Flow Velocity Distribution in Two Phase Pipe Flow

2009 ◽  
Author(s):  
Afshin Goharzadeh ◽  
Peter Rodgers
Keyword(s):  
Velocity Distribution ◽  
Slug Flow ◽  
Two Phase ◽  
Significant Drop ◽  
Horizontal Pipe ◽  
Measured Velocity ◽  
Air Bubble ◽  
Velocity Magnitude ◽  
Index Matching ◽  
Refractive Index Matching

This paper presents an experimental study of gas-liquid slug flow inside a horizontal pipe. The influence of air bubble passage on liquid flow is characterized using Particle Image Velocimetry (PIV) combined with Refractive Index Matching (RIM) and fluorescent tracers. A physical insight into the velocity distribution within slug flow is presented. It was observed that the slug flow significantly influences the velocity profile in the liquid film. Measured velocity distributions also revealed a significant drop in the velocity magnitude immediately upstream of the slug nose. These findings aim to aid an understanding of the mechanism of solid transportation in slug flows.

A Real-time Forest Monitoring System for Environmental Engineering Data Applications

2020 ◽  
Vol 51 (2) ◽  
pp. 03-04
Author(s):  
Raven Boxman
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Criminal Behavior ◽  
Environmental Engineering ◽  
Forest Monitoring ◽  
Safe Haven ◽  
The Earth ◽  
Engineering Data ◽  
To Come ◽  
Two Stages

The woods environment is basic for providing common assets to the greenery. The woods is an indispensable safe-haven, albeit at present it is presented to illicit logging by insatiable individuals, and this has altogether influenced the woodland. Because of this criminal behavior, unfortunate wonder has surfaced. Consequently, the system of this exploration is worried about building up a far off observing gadget that could catch basic ongoing information, for example, temperature, moistness, vaporous substance, and bonfire and downpour location, which could show the recent and the safeguarded characteristic state and environment in the woods. The model was actualized at chosen areas to screen and assemble information at two stages. The results from this exploration will be utilized in the advancement of a progression of games as instructing helps that can make mindful our group of people yet to come about the consumption and its effect upon the earth.

scholarly journals Enjoy a new perspective of the Earth

Physics World ◽  
2011 ◽  
Vol 24 (11) ◽  
pp. 48-49
Author(s):  
Shannon Franks
Keyword(s):  
The Earth ◽  
New Perspective

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 Coming up for Air: On Reading in a Global Pandemic

2021 ◽  
Vol 19 (1) ◽  
pp. 16-21
Author(s):  
Aparna Tarc
Keyword(s):  
Public Discourse ◽  
The Public ◽  
Social Sphere ◽  
The Earth ◽  
Global Pandemic ◽  
Teaching Of Reading ◽  
Racial Injustice ◽  
The World ◽  
To Come ◽  
The Public Sphere

The thought of breath grips the world as climate change, racial injustice and a global pandemic converge to suck oxygen, the lifeforce, out of the earth. The visibility of breath, its critical significance to existence, I argue, is made evident by poets. To speak of breath is to lodge ourselves between birth and death and requires sustained, meditative, attentive study to an everyday yet taken for granted practice. Like breathing, reading is also a practice that many took for granted until the pandemic. My paper will engage the affective and/or poetic dimensions of reading left out of theories of literacy that render it instrumental and divorced from the life of the reader (Freire, 1978). I will suggest that scholars of literacy, in every language, begin to engage a poetics of literacy as attending to the existential significance of language in carrying our personhood and lives. I will also argue that our diminishing capacities to read imaginatively and creatively have led to the rise of populist ideologies that infect public discourse and an increasingly anti-intellectual and depressed social sphere. Despite this decline in the practice and teaching of reading, it is reported that more than any other activity, reading sustained the lives of individuals and communities’ during a global pandemic. Teachers and scholars might take advantage of the renewed interested in reading to redeliver poetry and literary language to the public sphere to teach affective reading. Poetry harkens back to ancient practices of reading inherent in all traditions of reading. It enacts a pedagogy of breath, I argue, one that observes its significance in our capacity to exist through the exchange of air in words, an exchange of vital textual meanings we have taken for granted as we continue to infect our social and political world and earth with social hatred, toxins, and death. In this paper I engage fragments of poetry by poets of our time (last century onward) that teaches us to breathe and relearn the divine and primal stance that reading poetry attends to and demands. More than any other form, “poetry,” Ada Limon claims, “has breath built into it”. As such, reading poetry helps us to breathe when the world bears down and makes it hard for us to come up for air.

scholarly journals Methods to Test the “Dimming Effect” Produced by a Decrease in the Number of Photons Received from Receding Light Sources

2020 ◽  
Author(s):  
Mark Zilberman
Keyword(s):  
Light Source ◽  
Opposite Direction ◽  
Ecliptic Plane ◽  
Light Sources ◽  
The Sun ◽  
Decimal Point ◽  
Relativistic Systems ◽  
The Earth ◽  
New Models ◽  
Direction Opposite

The hypothetical “Dimming Effect” describes the change of the number of photons arriving from a moving light source per unit of time. In non-relativistic systems, the “Dimming effect” may occur due to the growing distance of light sources moving away from the receiver. This means that due to the growing distance, the photons continuously require more time to reach the receiver, which reduces the number of received photons per time unit compared to the number of emitted photons. Understandably, the proposed “Dimming effect” must be tested (confirmed or rejected) through observations. a. This article provides the formula for the calculation of “Dimming effect” values using the redshift parameter Z widely used in astronomy. b. The “Dimming effect” can possibly be detected utilizing the orbital movement of the Earth around the Sun. In accordance to the “Dimming effect”, observers on Earth will view 1.0001 more photons per time unit emitted by stars located near the ecliptic plane in the direction of the Earth orbiting the Sun. And, in contrast, observers will view only 0.9999 photons per time unit emitted by stars located near the ecliptic plane in the direction opposite to the Earth orbiting the Sun. Calculating precise measurements of the same stars within a 6-month period can possibly detect this difference. These changes in brightness are not only for specific stars, as the change in brightness takes place for all stars near the ecliptic in the direction of the Earth’s orbit around the Sun and in the opposite direction. c. The “Dimming effect” can possibly be detected in a physics laboratory using a moving light source (or mirror) and photon counters located in the direction of travel and in the opposite direction. d. In theory, Dilation of time can also be used for testing the existence of the “Dimming effect.” However, in experiments on Earth this effect appears in only the 14th digit after the decimal point and testing does not appear to be feasible. e. Why is it important to test the “Dimming effect?” If confirmed, it would allow astronomers to adjust values of "Standard Candles" used in astronomy. Since “Standard Candles” are critical in various cosmological models, the “Dimming effect” can correct models and/or reveal and support new models. If it is proved that the “Dimming effect” does not exist, it will mean that the number of photons arriving per unit of time does not depend on the speed of the light source and observer, which is not so apparent.

SACRED POLYPHONY ‘NOT UNDERSTANDID’: MEDIEVAL EXEGESIS, RITUAL TRADITION AND HENRY VIII'S REFORMATION

2010 ◽  
Vol 29 ◽  
pp. 33-77 ◽  
Author(s):  
Dana T. Marsh
Keyword(s):  
Middle Ages ◽  
Church Of England ◽  
Sacred Music ◽  
Traditional Church ◽  
The Reformation ◽  
High Middle Ages ◽  
To Come ◽  
New Perspective ◽  
The One ◽  
The Church

This study focuses on the ritual ‘conservatism’ of Henry VIII's Reformation through a new look at biblical exegeses of the period dealing with sacred music. Accordingly, it reconsiders the one extant passage of rhetoric to come from the Henrician regime in support of traditional church polyphony, as found in A Book of Ceremonies to be Used in the Church of England, c.1540. Examining the document's genesis, editorial history and ultimate suppression by Archbishop Thomas Cranmer, it is shown that Bishop Richard Sampson, Dean of the Chapel Royal (1522–40), was responsible for the original drafting of the musical paragraph. Beginning with Sampson's printed commentaries on the Psalms and on the Epistles of St Paul, the literary precedents and historical continuities upon which Sampson's topos in Ceremonies was founded are traced in detail. Identified through recurring patterns of scriptural and patristic citation, and understood via transhistorical shifts in the meaning of certain key words (e.g. iubilare), this new perspective clarifies important origins of the English church's musical ‘traditionalism’ on the eve of the Reformation. Moreover, it reveals a precise species of exegetical method – anagogy – as the literary vehicle through which influential clergy were able to justify expansions and elaborations of musical practice in the Western Church from the high Middle Ages to the Reformation.

The Material and Spiritual Rationales Are Inseparable

2012 ◽  
Author(s):  
Roald Hoffmann
Keyword(s):  
Sewage Treatment ◽  
Sustainable Chemistry ◽  
The Earth ◽  
The People ◽  
Moral Perspective ◽  
Material Reality ◽  
The World ◽  
Spiritual Satisfaction ◽  
To Come ◽  
Fundamental Tension

There are sound spiritual reasons for the ecological and environmentalist perspective—for minimizing pollution and harm to ourselves, to future generations, to the earth. Are these consistent with the material reality and aspirations of chemistry and chemical industry? One would like to think they are. But what of the realities? I want to take a hard, personal look at this fundamental tension. And also search for what is special about Green or Sustainable Chemistry, facing up to the obstacles confronting the field. And, while reaching for a measure of transformation, a multifaceted Green Index, to come back to a moral perspective on our creative activities. Chemists and chemical engineers are prone to believe that the general public does not recognize the contributions that chemistry has made to our health and our standard of living. And we often cringe at the perception that others blame us (and the great industries that employ us) for fouling our own nest, the infinity of ways we have found of affecting adversely our bodies and the earth by producing on the megaton scale the unnatural. Each of these adverse opinions can be productively discussed—both with the people whose adversarial or anguished arguments chemists react to, and with the chemists’ exaggerated and defensive response to them. The facts remain that the industries that transform matter (to which chemistry is central) have flourished to an extent that is staggering. They’ve played an essential material role in prolonging life, and while not making people any happier, they have provided spiritual value. The value I’m thinking of is not in creating the materials for CDs and books, ancillary tools to spiritual satisfaction, but in providing partial, yet unprecedented knowledge of the world. And the transformative industries are also responsible for an immense quantity of hazardous waste. The scale of their fecund creative enterprise is such that the major cycles of the world are perturbed. More than half the N and S atoms in our bodies have seen the inside of a chemical factory. And C, O, and H atoms too, through agriculture, food preparation, and sewage treatment.

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