178 research outputs found
UnerwĂŒnschte ErzĂ€hlungen : zur Dialektik des ErzĂ€hlens und Nicht-ErzĂ€hlens im Engelsjahr
GroĂe ErzĂ€hlungen im Engelsjahr 2020 handeln von der Textilindustrie gestern und heute. Die vorliegenden kleinen ErzĂ€hlungen spielen in anderen textilen Welten und jenseits der groĂen Fabriken. Von ihnen erzaÌhlt Friedrich Engels nicht. Dem ErzĂ€hlten und Nicht-ErzĂ€hlten auf der Spur finden wir schlieĂlich heraus, dass auch zu Friedrich Engels selbst in einer bestimmten Weise erzĂ€hlt - und nicht erzĂ€hlt wird
UnerwĂŒnschte ErzĂ€hlungen: zur Dialektik des ErzĂ€hlens und Nicht-ErzĂ€hlens im Engelsjahr
GroĂe ErzĂ€hlungen im Engelsjahr 2020 handeln von der Textilindustrie gestern und heute. Die vorliegenden kleinen ErzĂ€hlungen spielen in anderen textilen Welten und jenseits der groĂen Fabriken. Von ihnen erzaÌhlt Friedrich Engels nicht. Dem ErzĂ€hlten und Nicht-ErzĂ€hlten auf der Spur finden wir schlieĂlich heraus, dass auch zu Friedrich Engels selbst in einer bestimmten Weise erzĂ€hlt - und nicht erzĂ€hlt wird.Grand narratives in the "Engelsjahr" 2020 are about the textile industry yesterday and today. These little stories are set in other textile worlds and beyond the big factories. Friedrich Engels does not tell of them. Finally, following the track of the narrated and non-narrated, we discover that stories about Friedrich Engels himself are also told - and yet remain untold
The control of translational accuracy is a determinant of healthy ageing in yeast
Life requires the maintenance of molecular function in the face of stochastic processes that tend to adversely affect macromolecular integrity. This is particularly relevant during ageing, as many cellular functions decline with age, including growth, mitochondrial function and energy metabolism. Protein synthesis must deliver functional proteins at all times, implying that the effects of protein synthesis errors like amino acid misincorporation and stop-codon read-through must be minimized during ageing. Here we show that loss of translational accuracy accelerates the loss of viability in stationary phase yeast. Since reduced translational accuracy also reduces the folding competence of at least some proteins, we hypothesize that negative interactions between translational errors and age-related protein damage together overwhelm the cellular chaperone network. We further show that multiple cellular signalling networks control basal error rates in yeast cells, including a ROS signal controlled by mitochondrial activity, and the Ras pathway. Together, our findings indicate that signalling pathways regulating growth, protein homeostasis and energy metabolism may jointly safeguard accurate protein synthesis during healthy ageing
Comparative AMS radiocarbon dating of pretreated versus non-pretreated tropical wood samples
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 268 (2010): 910-913, doi:10.1016/j.nimb.2009.10.062.Several wood samples collected from Dorslandboom, a large African baobab (Adansonia
digitata L.) from Namibia, were investigated by AMS radiocarbon dating subsequent to
pretreatment and, alternatively, without pretreatment. The comparative statistical
evaluation of results showed that there were no significant differences between fraction
modern values and radiocarbon dates of the samples analyzed after pretreatment and
without pretreatment, respectively. The radiocarbon date of the oldest sample was 993 ± 20
BP. Dating results also revealed that Dorslandboom is a multi-generation tree, with several
stems showing different ages.This material is based on work supported by U.S. National Science
Foundation under Cooperative Agreement OCE-022828996. Part of the research was
supported by grants from the Romanian Academy and the Romanian National University
Research Council (PN II â ID 2354) and also by Nova Research Inc
Measuring the Quantum State of a Large Angular Momentum
We demonstrate a general method to measure the quantum state of an angular
momentum of arbitrary magnitude. The (2F+1) x (2F+1) density matrix is
completely determined from a set of Stern-Gerlach measurements with (4F+1)
different orientations of the quantization axis. We implement the protocol for
laser cooled Cesium atoms in the 6S_{1/2}(F=4) hyperfine ground state and apply
it to a variety of test states prepared by optical pumping and Larmor
precession. A comparison of input and measured states shows typical
reconstruction fidelities of about 0.95.Comment: 4 pages, 6 figures, submitted to PR
Conocimientos y habilidades mĂnimas, que un estudiante egresado de la carrera de EduaciĂłn FĂsica, debiera poseer
Tesis (Profesor de EducaciĂłn FĂsica para la Enseñanza BĂĄsica, Licenciado en EducaciĂłn)La siguiente investigaciĂłn es llevada a cabo durante el segundo semestre del año 2017, para el seminario de grado de la carrera de EducaciĂłn FĂsica de la Universidad AndrĂ©s Bello.
Se realiza un estudio respecto a los conocimientos o saber y a las habilidades o saber hacer mĂnimos que debe tener un egresado de la Carrera de EducaciĂłn FĂsica, esto considerando la opiniĂłn de una muestra de estudiantes de Ășltimo año de dicha carrera.
Para que la informaciĂłn sea lo mĂĄs representativa posible se consultĂł a estudiantes de la Universidad CatĂłlica Silva HenrĂquez, Universidad Metropolitana de la Ciencias de la EducaciĂłn (UMCE), Universidad SEK y la Universidad AndrĂ©s Bello (UNAB). Se asume que la aludida representatividad es parcial, sin embargo y tal como se explica en la viabilidad del estudio, los permisos y accesos a Instituciones de educaciĂłn Superior es compleja.
El instrumento utilizado fue una encuesta tipo cuestionario que permitió recabar los datos necesarios en breve tiempo. La confección de dicho instrumento estuvo a cargo de los propios tesistas y fue validado a través de tres expertos.
El estudio se enmarca dentro las exigencias que se estån instalando en la Formación Inicial Docente (FID), asà como también, en los procesos de evaluación de los docentes y su formación continua. Todo ello en un marco regulatorio que propicia la Ley de Carrera Docente, (2016)
Multiphoton Quantum Optics and Quantum State Engineering
We present a review of theoretical and experimental aspects of multiphoton
quantum optics. Multiphoton processes occur and are important for many aspects
of matter-radiation interactions that include the efficient ionization of atoms
and molecules, and, more generally, atomic transition mechanisms;
system-environment couplings and dissipative quantum dynamics; laser physics,
optical parametric processes, and interferometry. A single review cannot
account for all aspects of such an enormously vast subject. Here we choose to
concentrate our attention on parametric processes in nonlinear media, with
special emphasis on the engineering of nonclassical states of photons and
atoms. We present a detailed analysis of the methods and techniques for the
production of genuinely quantum multiphoton processes in nonlinear media, and
the corresponding models of multiphoton effective interactions. We review
existing proposals for the classification, engineering, and manipulation of
nonclassical states, including Fock states, macroscopic superposition states,
and multiphoton generalized coherent states. We introduce and discuss the
structure of canonical multiphoton quantum optics and the associated one- and
two-mode canonical multiphoton squeezed states. This framework provides a
consistent multiphoton generalization of two-photon quantum optics and a
consistent Hamiltonian description of multiphoton processes associated to
higher-order nonlinearities. Finally, we discuss very recent advances that by
combining linear and nonlinear optical devices allow to realize multiphoton
entangled states of the electromnagnetic field, that are relevant for
applications to efficient quantum computation, quantum teleportation, and
related problems in quantum communication and information.Comment: 198 pages, 36 eps figure
Land use changes after the period commodities rising price in the Rio Grande do Sul State, Brazil
BĂŒrger ohne Eigenschaften? : Die WeltbĂŒrgerbewegung gendersensibel verstehen
Reaktion auf fĂŒnf BeitrĂ€ge zum Thema Klimaschutz als WeltbĂŒrgerbewegung in GAIA: A. BrunnengrĂ€ber (2014), C. Leggewie et al. (2015), S. Bauriedl (2015), B. UnmĂŒĂig (2015), D. Mittler (2015)
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