2,713 research outputs found
Good, bad, and ugly colonial activities : studying development across the Americas
Levels of economic development vary widely within countries in the Americas. This paper argues that part of this variation has its roots in the colonial era. Colonizers engaged in different economic activities in different regions of a country, depending on local conditions. Some activities were"bad"in the sense that they depended heavily on the exploitation of labor and created extractive institutions, while"good"activities created inclusive institutions. The authors show that areas with bad colonial activities have lower gross domestic product per capita today than areas with good colonial activities. Areas with high pre-colonial population density also do worse today. In particular, the positive effect of"good"activities goes away in areas with high pre-colonial population density. The analysis attributes this to the"ugly"fact that colonizers used the pre-colonial population as an exploitable resource. The intermediating factor between history and current development appears to be institutional differences across regions and not income inequality or the current ethnic composition of the population.Population Policies,Economic Theory&Research,Demographics,,Country Population Profiles
The Superposition Principle of Waves Not Fulfilled under M. W. Evans' O(3) Hypothesis
In 1992 M.W. Evans proposed a so-called O(3) symmetry of electromagnetic
fields by adding a constant longitudinal "ghost field" to the well-known
transversal plane em waves. He considered this symmetry as a new law of
electromagnetics. Later on, since 2002, this O(3) symmetry became the center of
his Generally Covariant Unified Field Theory which he recently renamed as ECE
Theory. One of the best-checked laws of electrodynamics is the principle of
linear superposition of electromagnetic waves, manifesting itself in
interference phenomena. Its mathematical equivalent is the representation of
electric and magnetic fields as vectors. By considering the superposition of
two phase-shifted waves we show that the superposition principle is
incompatible with M.W. Evans' O(3) hypothesis.Comment: 5 pages, no figure
Komplexe Trithiocarbonate des zweiwertigen Kobalts
Läßt man bei Raumtemperatur unter Sauerstoffausschluß CS2 über die Gasphase in eine NH3-gesättigte wäßrige Lösung von [Co(NH3)6Cl2 diffundieren, dann bilden sich im Verlaufe von 24 Stdn. blauschwarze glänzende Rhomboeder und Kristallnadeln. Ihre analytisch gefundene Zusammensetzung ist Co(NH3)3CS3
Claw-free t-perfect graphs can be recognised in polynomial time
A graph is called t-perfect if its stable set polytope is defined by
non-negativity, edge and odd-cycle inequalities. We show that it can be decided
in polynomial time whether a given claw-free graph is t-perfect
Influences of Training and Personal Experiences on Counselor Trainees\u27 GLBT Ally Development: A Case Stud
The goal of this multiple case study was to investigate straight counseling students’ perceptions of their preparation to work with GLBT clients. For this study, semi - structured interviews were conducted with six straight counselor education students from two universities. Pattern matching analysis revealed that students with significant exposure to GLBT individuals, as well as those who believed their training provided adequate preparation for GLBT counseling, were more likely to adopt a GLBT - affirmative identity and to experience greater self - efficacy about counseling with GLBT individuals. In addition, thematic analysis revealed seven themes of participants’ experiences that fell into four categories. Ideas for counselor educators to incorporate experiential learning into their programs are offered
Cryogenic silicon detectors with implanted contacts for the detection of visible photons using the Neganov-Luke Effect
There is a common need in astroparticle experiments such as direct dark
matter detection, 0{\nu}\b{eta}\b{eta} (double beta decay without emission of
neutrinos) and Coherent Neutrino Nucleus Scattering experiments for light
detectors with a very low energy threshold. By employing the Neganov-Luke
Effect, the thermal signal of particle interactions in a semiconductor absorber
operated at cryogenic temperatures, can be amplified by drifting the
photogenerated electrons and holes in an electric field. This technology is not
used in current experiments, in particular because of a reduction of the signal
amplitude with time which is due to trapping of the charges within the
absorber. We present here the first results of a novel type of Neganov-Luke
Effect detector with an electric field configuration designed to improve the
charge collection within the semiconductor.Comment: 6 pages, 5 figures, submitted to Journal of Low Temperature Physic
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