17,020 research outputs found
Using the Hubbert curve to forecast oil production trends worldwide
No full textCrude oil is by far the most important commodity to humans after water and food.
Having a continuous and affordable supply of oil is considered a basic human right in
this day and age. That is the main reason oil companies are in a constant search of cost
effective ways and technologies that allow for an improved oil recovery rate. This would
improve profitability as well.
What almost everyone knows and dreads at the same time is that oil is an
exhaustible resource. This means that as more oil is being produced every day, the
amount of oil that remains to be produced shrinks even more. With almost all big oil
fields worldwide having already been discovered, the challenge of finding new reserves
grows harder and harder.
A question that has always been asked is ��������when are we going to run out of
oil?�������� Given the available technologies and techniques, no one could give an exact
answer and if someone does, he/she would not be 100% sure of that answer. This study
tries to approximate future oil production rates to the year 2050 using the Hubbert
model. There are different models or tools to estimate future oil production rates, but the reason that the Hubbert model was chosen for this study is its simplicity and data
availability.
As any forecast, this study depends heavily on past trends but also factors
in the current conditions. It is safe to say that this forecast (study) is as any other
forecast, in which it will probably not mirror exactly what will happen in the future.
Still, forecasts have to be done, especially for such an important commodity.
This study predicts that the total oil to be recovered is 4.1 trillion barrels. It
also shows that most major oil-producing countries are either passed or about to pass
their peaks
QuintEssence: Works by Quantz, Bach and Schubert
No full textRepertoire: Quantz: Flute concerto in E Major; Bach: Brandenburg Concerto No. 5; Schubert: String Quartet ("Rosamunde"). Performers: Lamb, E. (flute) Beer, A. (violin) Cho, Y. (violin) Samuel, D. (viola) Rummel, M (cello) Tibbles, J. (harpsichord
Das Heimweh. Hell. July 1816 // frz. Schubert M[anu propr]ia (manuscrit autographe)
No full textTitre uniforme : Schubert, Franz (1797-1828). Compositeur. [Das Heimweh. D 456]Titre uniforme : Schubert, Franz (1797-1828). Compositeur. [Aus Diego Manazares. Ilmerine. D 458]Comprend : Aus Diego Manazares. Ilmerine. den 30. July 1816 // franz Schubert M[anu propr]iaTitre propre pris au départ. - Poème de Theodor Hell. - Contient au v° : "Aus Diego Manazares. Ilmerine". - Ms. autogr. à l'encre : mise au net. - Barré en croix. - Annotations d'une autre main : "Im Repertorium ist noch verzeichnet : // Das Heimweh, Text von J.L. Pyrker. Das Autograph hiervon, // (in Gastein geschrieben) dürfte bei Landsberg in // Berlin sich befinden. Erschien als op. 79 N. 1 bei Haslinger C." (marge gauche) ; "Eine Copie in D dur vide N. 5 Abth. VI"Lieder acc. de piano -- +* 1800......- 1899......+:19e siècle
QuintEssence: Works by Bach, Mozart, Schubert and Kodaly
No full textRepertoire: Bach: Suite for cello solo No. 1, BWV 1007; Schubert: Salve Regina D 676; Bach: Harpsichord Concerto BWV 1052. Performers: Beer, A. (violin), Cho, Y. (violin), Samuel, D. (viola), Rummel, M. (cello), Tibbles, J. (harpsichord), Atchison, M. (soprano
A note on the weight spectrum of the Schubert code C-alpha(2, m)
No full textWe consider the Schubert code Ca(2, m) associated to the Fq -rational points of the Schubert variety Qa(2, m) in the Grassmannian G2, m. A correspondence between codewords of Ca(2, m) and skew-symmetric matrices of certain special form is given. Using this correspondence, we give a formula for all possible weights of codewords in Ca(2, m). It is shown that the weight of each codeword is divisible by certain power of q. Further, a formula for the weight spectrum of the Schubert code Ca(2, m) is given
Following Schubert varieties under Feigin’s degeneration of the flag variety
No full textWe study the effect of Feigin's flat degeneration of the type A flag variety on the defining ideals of its Schubert varieties. In particular, we describe two classes of Schubert varieties which stay irreducible under the degenerations and in several cases we are able to encode reducibility of the degenerations in terms of symmetric group combinatorics. As a side result, we obtain an identification of some degenerate Schubert varieties (i.e. the vanishing sets of initial ideals of the ideals of Schubert varieties with respect to Feigin's Grobner degeneration) with Richardson varieties in higher rank partial flag varieties
Le dissonanze ineluttabili della "signora Schubert"
No full textIl lavoro analizza dal punto di vista filologico-letterario le prose poetiche intitolate alla "signora Schubert" della poetessa polacca Ewa Lipska
The Zero discounting and maximin optimal paths in a simple model of global warming
No full textFollowing Stollery [1998], we extend the Solow, Dasgupta-Heal model to analyze the effects of global warning. The rise of temperature is caused by the use of fossil resources so that the temperature level can be linked to the remaining stock of these resources. The rise of temperature affects both productivity and utility. We characterize optimal solutions for the maximin and zero-discounting cases and present closed form solutions for the case where the production function and utility function are Cobb-Douglas, and the temperature level is an exponential function of the remaining stock of resources. We show that a greater weight of temperature in the preferences or a larger intertemporal elasticity of substitution both lead to postpone resource use.Maximin ; zero discounting ; global warming
The Research of Liszt's Transcription "M\ufcller-Lieder von Franz Schubert"
No full textLiszt, the pianist well-known for his outstanding performing style, has led a trend of 19th century virtuoso style and created a phonomonon for piano world in the Romantic period. A great deal of his piano transcriptions have helped to promote many composers\ue2 works and also the development of modern piano manufacture to the new level. Those transcriptions have become the standard concert repertoire of modern virtuoso pianists. A large proportion of Liszt\ue2s piano transcriptions is Schubert Lieder transcriptions which were increasing brilliant style within the beauty and simplicity of Schubert\ue2s melody. The M\ufcllerlieder is the last one of Schubert lieder transcriptions that Liszt composed in 1846. Through his superb compositional technique, this transcription conveys musical content of Schubert lieder successfully.
Chapter one in this paper will introduce Liszt\ue2s compositional life of piano transcriptions, including the society background and different types of transcriptions. The connection between Liszt and Schubert lieder is also discussed in it. Chapter two includes the development of piano and the virtuoso style in the times of Liszt. The last chapter focuses on the research of Die Sch\uf6ne M\ufcller, comparing Schubert\ue2s original song edition and the transcription of Liszt and concentrates on analyzing Liszt\ue2s compositional technique in this piano transcription
Fragment aus dem Äschylus // Juny 1816 // franz Schubert // M[anu propr]ia (manuscrit autographe)
No full textTitre uniforme : Schubert, Franz (1797-1828). Compositeur. [Fragment aus dem Aeschylus. D 450]Titre uniforme : Schubert, Franz (1797-1828). Compositeur. [Das war ich (1816). D deest]Comprend : Das war ich. KörnerTitre propre pris au départ. - Texte d'Eschyle, extrait des "Euménides", traduit par Johann Mayrhofer. - À la suite (f. 2 r°), esquisse, abandonnée au bout de 5 mesures et raturée, pour une mise en musique de "Das war ich" de Theodor Körner, sans rapport avec le lied D 174 composé sur le même texte en 1815. - Ms. autogr. à l'encre : mise au net avec quelques ratures et corrections. - Broché dans une chemise avec titre et authentification de la main d'Eusebius Mandyczewski : "Fragment aus dem Aeschylus. // für eine Singstimme mit Begleitung des Pianoforte. // Originale // von // Franz Schubert. // Juny 1816" ; au verso : "Die Echtheit dieses Autographs // bestätigt // Eusebius Mandyczewski // Wien, am 8. Juni 1893". - F. 2 v° inutiliséLieder acc. de piano -- +* 1800......- 1899......+:19e siècle
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