From workers education to societal competencies: approaches to a critical, emancipatory education for democracy

This article presents two conceptions concerning critical political education for workers, developed in Germany in the 1960s and the 1990s respectively. First, the conception of “Sociological Imagination and Exemplary Learning” published in 1968 by the German philosopher and sociologist Oskar Negt (1975). Further the elaboration of this conception, which since the 1980s is known as “Societal Competencies“ (Negt, 1986). These competencies concern fundamental knowledge, which enables people to make political judgments, and act politically in democratic societies in an enlightened and reflected way. This conception deliberately distinguishes itself from the economic, instrumentalist notions of key qualifications and key competencies, which at least since the 1970s have been discussed with the aim of maintaining individual employability and competitiveness. ‘Societal competencies’ aim for individual and collective emancipation, the development of the capability to make judgments, and autonomy in the sense of the enlightened political agency and participation in democratization processes. (DIPF/Orig.

From workers education to societal competencies: approaches to a critical, emancipatory education for democracy

This article presents two conceptions concerning critical political education for workers, developed in Germany in the 1960s and the 1990s respectively. First, the conception of “Sociological Imagination and Exemplary Learning” published in 1968 by the German philosopher and sociologist Oskar Negt (1975). Further the elaboration of this conception, which since the 1980s is known as “Societal Competencies“ (Negt, 1986). These competencies concern fundamental knowledge, which enables people to make political judgments, and act politically in democratic societies in an enlightened and reflected way. This conception deliberately distinguishes itself from the economic, instrumentalist notions of key qualifications and key competencies, which at least since the 1970s have been discussed with the aim of maintaining individual employability and competitiveness. ‘Societal competencies’ aim for individual and collective emancipation, the development of the capability to make judgments, and autonomy in the sense of the enlightened political agency and participation in democratization processes. (DIPF/Orig.

Cubic di-μ-amido-bis[bis(η5-cyclopentadienyl)ytterbium(III)]

The title compound, [Yb2(C5H5)4(NH2)2], was synthesized in a Parr high-pressure vessel starting from monoclinic [Cp2YbNH2]2 (where Cp = cyclopentadienyl). The complex is located on a special position of site symmetry mmm with just an eighth of the complex in the asymmetric unit. The Yb atom is in a distorted tetrahedral coordination environment, coordinated by two cyclopentadienyl rings and two amino groups forming a dimeric complex bridged through the amino groups. This compound represents the high-pressure cubic modification of monoclinic [Cp2YbNH2]2 obtained at 250 bar (1 bar = 105 Pa) under an atmosphere of argon

The Lexis diagram, a misnomer

Around 1870, demographers felt the need for a simple chart to present population dynamics. This chart is known as the Lexis diagram, but it is a misnomer. To be useful, this chart must allow for the systematic location on one plane of the three classical demographic co-ordinates, namely: the date, the age and the moment of birth. There are three solutions for this problem. In 1869, Zeuner worked out a first solution. In 1870, Brasche proposed a second one with networks of parallels; it is the version most currently used now. In 1874, Becker proposed the third one. In 1875, certainly after Verwey, Lexis took back the Zeuner’s diagram and just added networks of parallels. In spite of all this, the name "Lexis diagram" has imposed itself in a seemingly invincible way.history, Lexis diagram

Anti-phospholipid-antibodies in patients with relapsing polychondritis

Relapsing polychondritis (RP) is an extremly rare multisystemic disease thought to be of autoimmune origin. In order to assess if RP is associated with anti-phospholipid antibodies (aPL), clinical data and sera of 21 patients with RP were collected in a multicentre study. Concentration of anti-cardiolipin antibodies (aCL) (IgG-, IgM-and IgA-isotypes), anti-phosphatidylserine-antibodies (aPS) (IgG-and IgM-isotypes) and anti-β-2-glycoprotein I-antibodies (aβ2 GPI) were measured by ELISA. In eight patients aCL were found to be elevated. One patient had elevated aPS. No patient had elevated aβ2 GPI. No patient had clinical signs and symptoms of a aPL syndrome. Interestingly, the two RP patients with the highest aPL had concomitant systemic lupus erythematosus (SLE). Therefore the presence of elevated aPL in RP is probably more closely related to an associated SLE than to RP itself. There is no convincing evidence that aPL are associated with RP

A SiGe HEMT Mixer IC with Low Conversion Loss

The authors present the first SiGe HEMT mixer integrated circuit. The active mixer stage, operating up to 10GHz RF, has been designed and realized using a 0.1µ µµ µm gate length transistor technology. The design is based on a new large-signal simulation model developed for the SiGe HEMT. Good agreement between simulation and measurement is reached. The mixer exhibits 4.0dB and 4.7dB conversion loss when down-converting 3.0GHz and 6.0GHz signals, respectively, to an intermediate frequency of 500MHz using high-side injection of 5dBm local oscillator power. Conversion loss is less than 8dB for RF frequencies up to 10GHz with a mixer linearity of –8.8dBm input related 1dB compression point

One-Pot Synthesis of Single-Source Precursors for Nanocrystalline LED Phosphors M2Si5N8:Eu2+ (M = Sr, Ba)

Highly efficient red-emitting nitridosilicate phosphors Sr2Si5N8:Eu2+ and Ba1.5Sr0.5Si5N8:Eu2+ (doping level 1%) applicable to phosphor converted pc-LEDs were synthesized in nanocrystalline form at low temperatures employing a novel single-source precursor approach. Synthesis starts from nanocrystalline silicon and uses mixed metal amides M(NH2)2 with M = Sr, Ba, Eu as reactive intermediates. In a second approach, a single-source precursor mixture obtained from a one-pot reaction of the corresponding elements (Sr/Ba, Eu, Si) was obtained in supercritical ammonia. Thermoanalytical in situ investigations gain a deeper insight into the degradation mechanism of the mixed metal amide precursors and revealed the onset for the formation of the 2-5-8 phosphor materials at temperatures slightly above 900°C. Formation of the products is complete below 1400°C. Under these conditions, the nitridosilicate phosphors form spherically shaped particles with crystallites of 200 nm in size. Spherical particles are desirable for phosphor application because light extraction may be improved by decreased light trapping and re-absorption losses. As a major advantage of the one-pot precursor approach, the exact Sr/Ba content in the solid solution series Sr2−xBaxSi2N8:Eu2+ and the doping concentration of Eu2+ can easily be controlled in a wide range by the relative amount of the elemental starting materials (Sr, Ba, Eu, Si). Simultaneously, thorough mixing of these elements down to an atomic level (Sr, Ba, Eu) or at least at nanoscopic dimensions (silicon) is achieved by the solution approach. As a consequence, no milling and pre-reaction steps are necessary which might give rise to contamination. Advantageously, this approach can easily be extended to large-scale processes by simultaneously preserving complete mixing. Furthermore, the influence of the starting materials (single-source precursor, nanocrystalline silicon) and the reaction conditions on the crystal shape and finally on the luminescence properties of the products was investigated. The obtained nanophosphors exhibit luminescence properties comparable to coarsely crystalline nitridosilicate phosphor powders prepared by conventional high-temperature processing

Synthetic gauge fields for light beams in optical resonators

A method to realize artificial magnetic fields for light waves trapped in passive optical cavities with anamorphic optical elements is theoretically proposed. In particular, when a homogeneous magnetic field is realized, a highly-degenerate Landau level structure for the frequency spectrum of the transverse resonator modes is obtained, corresponding to a cyclotron motion of the optical cavity field. This can be probed by transient excitation of the passive optical resonator.Comment: 5 pages, 4 figure