116 research outputs found
Der Schädel Immanuel Kant's : mit drei nach photographischen Aufnahmen angefertigten Lichtdrucktafeln und einer in Holzschnitt ausgeführten Constructionszeichnung des Medianschnittes von Schädel und Gesicht
http://tartu.ester.ee/record=b1935063~S1*es
Generalized invariant variational problems
In Lankford, B. A.; Mahoo, H. F. (Eds.). Proceedings of East Africa Integrated River Basin Management Conference, Sokoine University of Agriculture, Morogoro, Tanzania, 7 ? 9 March 2005. Theme five: water economics and livelihoods. Morogoro, Tanzania: Soil-Water Management Research Group, Sokoine University of AgricultureThe need to achieve efficient, equitable and sustainable use of water resources to meet water demands of different sectors is pressing, particularly in areas where water resources are dwindling. Along with this is the quest for a good understanding of the value of water in its different uses. Using the Change in Net Income method, this paper presents an assessment of the value of water in irrigated paddy and hydroelectric power (HEP) generation in the Great Ruaha (GR) Catchment in Tanzania. The average values of water for irrigated paddy were estimated at 0.06-0.21 per m3 for gross and consumed water respectively). Yet irrigated paddy also contributes much: it supports the livelihoods of about 30,000 agrarian families in Usangu with average annual gross income of about US $ 911.90 per annum per family and the GR paddy contributes about 14-24% to national paddy production. Understanding these benefits is key to fostering informed debate on water management and allocation, identifying the base for making ?agreeable? trade-offs, the potential for improvement, and creating linkages with water allocation options
Continuous symmetries of Lagrangians and exact solutions of discrete equations
One of the difficulties encountered when studying physical theories in
discrete space-time is that of describing the underlying continuous symmetries
(like Lorentz, or Galilei invariance). One of the ways of addressing this
difficulty is to consider point transformations acting simultaneously on
difference equations and lattices. In a previous article we have classified
ordinary difference schemes invariant under Lie groups of point
transformations. The present article is devoted to an invariant Lagrangian
formalism for scalar single-variable difference schemes. The formalism is used
to obtain first integrals and explicit exact solutions of the schemes.
Equations invariant under two- and three- dimensional groups of Lagrangian
symmetries are considered.Comment: 31 pages, submitted to Journal of Mathematical Physic
Gauge transformations for higher-order lagrangians
Noether's symmetry transformations for higher-order lagrangians are studied.
A characterization of these transformations is presented, which is useful to
find gauge transformations for higher-order singular lagrangians. The case of
second-order lagrangians is studied in detail. Some examples that illustrate
our results are given; in particular, for the lagrangian of a relativistic
particle with curvature, lagrangian gauge transformations are obtained, though
there are no hamiltonian gauge generators for them.Comment: 22 pages, LaTe
Lattice QCD Calculation for the Physical Equation of State
In this report we consider the numerical simulations at finite temperature
using lattice QCD data for the computation of the thermodynamical quantities
including the pressure, energy density and the entropy density. These physical
quantities can be related to the equation of state for quarks and gluons. We
shall apply the lattice data to the evaluation of the specific structure of the
gluon and quark condensates at finite temperature in relation to the
deconfinement and chiral phase transitions. Finally we mention the quantum
nature of the phases at lower temperatures.Comment: 60 pages, 15 figure
How Ordinary Elimination Became Gaussian Elimination
Newton, in notes that he would rather not have seen published, described a
process for solving simultaneous equations that later authors applied
specifically to linear equations. This method that Euler did not recommend,
that Legendre called "ordinary," and that Gauss called "common" - is now named
after Gauss: "Gaussian" elimination. Gauss's name became associated with
elimination through the adoption, by professional computers, of a specialized
notation that Gauss devised for his own least squares calculations. The
notation allowed elimination to be viewed as a sequence of arithmetic
operations that were repeatedly optimized for hand computing and eventually
were described by matrices.Comment: 56 pages, 21 figures, 1 tabl
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. I. Simultaneous broadband observations during November 2003
Some intra-day variable, compact extra-galactic radio sources show brightness
temperatures severely exceeding 10^{12} K, the limit set by catastrophic
inverse-Compton (IC) cooling in sources of incoherent synchrotron radiation.
The violation of the IC limit, possible under non-stationary conditions, would
lead to IC avalanches in the soft-gamma-ray energy band during transient
periods. For the first time, broadband signatures of possible IC catastrophes
were searched for in S5 0716+71. A multifrequency observing campaign targetting
S5 0716+71 was carried out in November 2003 under the framework of the European
Network for the Investigation of Galactic nuclei through Multifrequency
Analysis (ENIGMA) together with a campaign by the Whole Earth Blazar Telescope
(WEBT), involving a pointing by the soft-gamma-ray satellite INTEGRAL, optical,
near-infrared, sub-millimeter, millimeter, radio, and Very Long Baseline Array
(VLBA) monitoring. S5 0716+71 was very bright at radio frequencies and in a
rather faint optical state during the INTEGRAL pointing; significant inter-day
and low intra-day variability was recorded in the radio regime, while typical
fast variability features were observed in the optical band. No correlation was
found between the radio and optical emission. The source was not detected by
INTEGRAL, neither by the X-ray monitor JEM-X nor by the gamma-ray imager ISGRI,
but upper limits to the source emission in the 3-200 keV energy band were
estimated. A brightness temperature Tb>2.1x10^{14} K was inferred from the
radio variability, but no corresponding signatures of IC avalanches were
recorded at higher energies. The absence of IC-catastrophe signatures provides
either a lower limit delta>8 to the Doppler factor affecting the radio emission
or strong constraints for modelling of the Compton catastrophes in S5 0716+71.Comment: 15 pages, 3 EPS figures, 3 tables, to appear in A&
Evaluación de Parámetros de control obligatorio del agua potable proveniente del manantial Cuyuraya de la provincia de Huancané – Región Puno, 2019
El objetivo de este estudio fue el de evaluar los parámetros de control obligatorio de agua potable en la provincia de Huancané. Los puntos de monitoreo fueron seleccionados según la ubicación establecida por la Empresa Prestadora de Servicios “EPS NOR PUNO S.A.”; con los siguientes puntos: fuente principal de abastecimiento de agua (manantial Cuyuraya) y la red principal de abastecimiento (desde la primera vivienda, zona media y vivienda final) siendo un total de 6 puntos de monitoreo. Los parámetros evaluados según Reglamento de la Calidad del Agua para Consumo Humano DS N° 031 – 2010 – SA, fueron: pH, color, cloro residual, turbiedad, coliformes totales y termotolerantes, los cuales fueron analizados in-situ o en un laboratorio respectivamente, con un resultado de que solo 3 de los 6 parámetros evaluados cumplen con lo que indica el reglamento, debido a que Cloro Residual no llega al mínimo establecido de 0.5 mg/L, Coliformes Totales y Termotolerantes exceden en 16 UFC como máximo y <1.1 como mínimo, concluyendo que el agua que se distribuye en todo Huancané es directamente afectada por los niveles bajos de cloro residual, ocasionando que exista la presencia de coliformes (totales y termotolerantes), lo que afecta directamente a la calidad del agua que se distribuye en la provincia de Huancané.Trabajo de investigaciónJULIACAEscuela Profesional de Ingeniería AmbientalBiodiversidad y calidad ambienta
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