490 research outputs found
Foreword
The authors in this issue of Law and Contemporary Problems explore the everyday lives of international law. More specifically, the authors theorize and investigate select practices of the International Criminal Court (ICC), by which I mean recurrent and meaningful work activities—social or material—that are performed in a regularized fashion and that have a bearing, whether large or small, on the operation of the ICC. By conceiving the ICC as a bundle of practices rather than as a unitary actor whose performance is primarily governed by politics, I seek to re-direct the existing literature on the much debated international organization, which has largely failed to engage, both theoretically and empirically, with the inner workings of the sizable bureaucracy based in The Hague—and the many organizational, cultural, and other cleavages that run through it and that have had a more than random institutional effect on international adjudication. In this foreword I give a brief account of the theoretical foundations on which this issue of Law and Contemporary Problems rests, then provide an overview of the empirical investigations. I close by briefly sketching avenues for further research
The structure of online activism
Despite the tremendous amount of attention that has been paid to the internet as a tool for civic engagement, we still have little idea how “active” is the average online activist or how social networks matter in facilitating electronic protest. In this paper, we use complete records on the donation and recruitment activity of 1.2 million members of the Save Darfur “Cause” on Facebook to provide a detailed first look at a massive online social movement. While both donation and recruitment behavior are socially patterned, the vast majority of Cause members recruited no one else into the Cause and contributed no money to it-suggesting that in the case of the Save Darfur campaign, Facebook conjured an illusion of activism rather than facilitating the real thing
Philae Landing on Comet 67P/Churyumov-Gerasimenko – Planned Chirality Measurements and Ideas for the Future
Philae is a comet Lander, part of the ESA Rosetta Mission to comet 67P/Churyumov-Gerasimenko. After a ten year cruise through the solar system it successfully landed on the nucleus of the comet on November 12, 2014. Philae's payload consists of ten scientific instruments, including COSAC, an evolved gas analyser with the capability to differentiate chiral molecules. After the touchdown of Philae, the anchoring harpoons, which were expected to fix the lander to ground, did not work, Philae bounced in the low gravity environment, and only came to rest after a 2 hours " hop " in an unforeseen area on the comet surface. Although, the scientific instruments, including cameras, mass spectrometers (including the one of COSAC), a magnetometer and a radar instrument could be operated, and fascinating, unprecedented scientific results were obtained, it was not possible to collect a sample of the surface material and no gas chromatography measurement could be performed. Thus, the measurement of the chirality of molecules on comets is still to be done in the future. The paper gives an overview of the Philae mission and the attempts to measure chiral molecules with COSAC, and suggests future measurements with returned samples from the primitive asteroids (162173) Ryugu and (101955) Bennu with the spacecraft Hayabusa 2 (JAXA) and OSIRIS-REx (NASA), respectively. Both will reach their targets in 2018
The Political Economy of 'Lawfare'
The University Archives has determined that this item is of continuing value to OSU's history.Jens Meierhenrich is Assistant Professor of Government and Social Studies at
Harvard University, where he is also a Faculty Associate at the Weatherhead Center
for International Affairs. His lecture is on the Political Economy of "Lawfare."Ohio State University. Mershon Center for International Security StudiesEvent webpage, streaming video, photo
Amino Acids in Comets and Meteorites: Stability under Gamma Radiation and Preservation of Chirality
Amino acids in solar system bodies may have played a key role in the
chemistry that led to the origin of life on Earth. We present laboratory
studies testing the stability of amino acids against gamma radiation
photolysis. All the 20 chiral amino acids in the levo form used in the proteins
of the current terrestrial biochemistry have been irradiated in the solid state
with gamma radiation to a dose of 3.2 MGy which is the dose equivalent to that
derived by radionuclide decay in comets and asteroids in 1.05x109 years. For
each amino acid the radiolysis degree and the radioracemization degree was
measured by differential scanning calorimetry (DSC) and by optical rotatory
dispersion (ORD) spectroscopy. From these measurements a radiolysis rate
constant kdsc and a radioracemization rate constant krac have been determined
for each amino acid and extrapolated to a dose of 14 MGy which corresponds to
the expected total dose delivered by the natural radionuclides decay to all the
organic molecules present in comets and asteroids in 4.6x109 years, the age of
the Solar System. It is shown that all the amino acids studied can survive a
radiation dose of 14 MGy in significant quantity although part of them are lost
in radiolytic processes. Similarly, also the radioracemization process
accompanying the radiolysis does not extinguish the chirality. The knowledge of
the radiolysis and radioracemization rate constants may permit the calculation
of the original concentration of the amino acids at the times of the formation
of the Solar System starting from the concentration found today in carbonaceous
chondrites. For some amino acids the concentration in the presolar nebula could
have been up to 6 times higher than currently observed in meteorites.Comment: 20 pages, 5 figures, submitted to MNRA
The Origin of Primitive Cells, Nutrient Intake, and Non-Enzymatic Elongation of Encapsulated Nucleotides
Fatty acids and fatty alcohols are commonly found in experiments simulating the prebiotic 'soup'. These amphiphiles can be synthesized under prebiotic conditions, at least as long as the molecules are chemically relatively simple and do not need to be enantiomerically pure. In the context of topical origin-of-life theories, two distinct formation pathways for amphiphiles have been described; one related to geophysical sites, such as marine hydrothermal systems, and another to extraterrestrial sources, such as the proto-solar nebula, which was fed by interplanetary and interstellar nebulae. The chemical analysis of each provides individual characteristic challenges
Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser
One of the most attractive hypothesis for the origin of homochirality in terrestrial bioorganic compounds is that a kind of “chiral impulse” as an asymmetric excitation source induced asymmetric reactions on the surfaces of such materials such as meteorites or interstellar dusts prior to the existence of terrestrial life (Cosmic Scenario). To experimentally introduce chiral structure into racemic films of amino acids (alanine, phenylalanine, isovaline, etc.), we irradiated them with linearly polarized light (LPL) from synchrotron radiation and circularly polarized light (CPL) from a free electron laser. After the irradiation, we evaluated optical anisotropy by measuring the circular dichroism (CD) spectra and verified that new Cotton peaks appeared at almost the same peak position as those of the corresponding non-racemic amino acid films. With LPL irradiation, two-dimensional anisotropic structure expressed as linear dichroism and/or linear birefringence was introduced into the racemic films. With CPL irradiation, the signs of the Cotton peaks exhibit symmetrical structure corresponding to the direction of CPL rotation. This indicates that some kinds of chiral structure were introduced into the racemic film. The CD spectra after CPL irradiation suggest the chiral structure should be derived from not only preferential photolysis but also from photolysis-induced molecular structural change. These results suggest that circularly polarized light sources in space could be associated with the origin of terrestrial homochirality; that is, they would be effective asymmetric exciting sources introducing chiral structures into bio-organic molecules or complex organic compounds
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