233 research outputs found
[Frau Bertschinger]
No full textDreiviertelporträt (Kniestück) der Frau Bertschinger, geb. Siber, von Wylikon, im BleicherwegAnonyme Druckgrafi
Untersuchungen über die Wirkung der Sandfilter des städtischen Wasserwerks in Zürich
No full textAlfred BertschingerSonderdruck aus: Vierteljahresschrift der Naturforschenden Gesellschaft in Zürich, 1889, Jg. 34, Heft
Adding long-wavelength modes to an N-body simulation
No full textWe present a new method to add long-wavelength power to an evolved N-body simulation, making use of the Zeldovich approximation to change positions and velocities of particles. We describe the theoretical framework of our technique and apply it to a P3M cosmological simulation performed on a cube of 100 Mpc on a side, obtaining a new "simulation" of 800 Mpc on a side. We study the effect of the power added by long waves by means of several statistics of the density and velocity field, and we suggest possible applications of our method to the study of the large-scale structure of the universe
Experten-Gutachten betreffend verschiedene in Untersuchung gezogene Quellwasser : erstattet der erweiterten Wasser-Kommission der Stadt Zürich als Auftraggeberin
No full textBd. 1 I. Gutachten der Herren Professoren Albert Heim, Carl Cramer, Georg Lunge und Alfred Bertschinger betreffend die Quellen im hintern WäggithalDr. A. Heim ; Dr. C. Cramer ; Dr. G. Lunge ; Stadtchemiker BertschingerExlibrisetikette: "Geschenk aus dem Nachlasse von August Waldner" 002194263_0002 Exemplar der ETH-BIBIndirektes handschriftliches Exlibris: "1907, 136", das ist August Waldner 002194263_0003 Exemplar der ETH-BI
Seen and unseen tidal caustics in the Andromeda galaxy
No full textIndirect detection of high-energy particles from dark matter interactions is a promising
avenue for learning more about dark matter, but is hampered by the frequent coincidence
of high-energy astrophysical sources of such particles with putative high-density
regions of dark matter. We calculate the boost factor and gamma-ray flux from dark
matter associated with two shell-like caustics of luminous tidal debris recently discovered
around the Andromeda galaxy, under the assumption that dark matter is its own
supersymmetric antiparticle. These shell features could be a good candidate for indirect
detection of dark matter via gamma rays because they are located far from the primary
confusion sources at the galaxy’s center, and because the shapes of the shells indicate
that most of the mass has piled up near apocenter. Using a numerical estimator specifically
calibrated to estimate densities in N-body representations with sharp features and
a previously determined N-body model of the shells, we find that the largest boost factors
do occur in the shells but are only a few percent. We also find that the gamma-ray
flux is an order of magnitude too low to be detected with Fermi for likely dark matter
parameters, and about 2 orders of magnitude less than the signal that would have come
from the dwarf galaxy that produces the shells in the N-body model. We further show
that the radial density profiles and relative radial spacing of the shells, in either dark
or luminous matter, is relatively insensitive to the details of the potential of the host
galaxy but depends in a predictable way on the velocity dispersion of the progenitor
galaxy.United States. National Aeronautics and Space Administration (grant NNG06GG99G
Strategic Payments in Financial Networks
No full textIn their seminal work on systemic risk in financial markets, Eisenberg and Noe [Larry Eisenberg and Thomas Noe, 2001] proposed and studied a model with n firms embedded into a network of debt relations. We analyze this model from a game-theoretic point of view. Every firm is a rational agent in a directed graph that has an incentive to allocate payments in order to clear as much of its debt as possible. Each edge is weighted and describes a liability between the firms. We consider several variants of the game that differ in the permissible payment strategies. We study the existence and computational complexity of pure Nash and strong equilibria, and we provide bounds on the (strong) prices of anarchy and stability for a natural notion of social welfare. Our results highlight the power of financial regulation - if payments of insolvent firms can be centrally assigned, a socially optimal strong equilibrium can be found in polynomial time. In contrast, worst-case strong equilibria can be a factor of Ω(n) away from optimal, and, in general, computing a best response is an NP-hard problem. For less permissible sets of strategies, we show that pure equilibria might not exist, and deciding their existence as well as computing them if they exist constitute NP-hard problems
Ausführliches theoretisch-praktisches Lehrbuch der Englischen Sprache : enthaltend eine wissenschaftlich geordnete Anleitung zur Aussprache und zur Aneignung der Sprachformen; die vollständige Entwickelung der Syntax, begleitet von zahlreichen Beispielen, so wie auch von zweckmässigen Uebungen für obere Klassen und überhaupt für reifere Schüler; ferner, als Anhang, ausser belehrenden Gesprächen, eine leicht fassliche Anleitung zur Kenntniss und Einübung des im Merkantilischen üblichen Styles, eine Auswahl guter, zweckmässig erläuterter Lesestücke, und endlich auch eine Uebersicht der ganzen englischen National-Literatur
No full textvon G.F. Burckhardt und Dr. J.M. JostHandschriftliches Exlibris: "G. Escher De Berg, 1845" 002361720_0002 Exemplar der ETH-BIBHandschriftliches Exlibris: "J.S. Bertschinger" 002361720_0001 Exemplar der ETH-BI
Elemente der technischen Chemie : zum Gebrauch beim Unterricht im königl. Gewerbinstitut und den Provinzial-Gewerbschulen des preuss. Staats
No full textErnst Ludwig SchubarthBd. 1: XIV, 525 Seiten, [1] Blatt, 503 Seiten ; Bd. 2: VI, 747 SeitenHandschriftliches Exlibris: "O.(?) Bertschinger(?) Apotheker 1837" 002250059_0001 Exemplar der ETH-BI
Auszug aus der Schweizergeschichte : für die 2. Stufe der allgemeinen Fortbildungsschulen des Bezirkes Winterthur bearbeitet : Beigabe zu den Geschichtskarten
No full text[s.c.
Auszug aus der Schweizergeschichte : Lehrmittel für die Fortbildungsschulen des Kantons Zürich : Beigabe zu den Geschichtskarten
No full text[von Karl Dändliker
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