Sythetic Securitization: A Comment on Bell & Dawson

The topic studied in this thesis is the right of public access as a legal institution. In that connection, several questions which are different from each other are raised. The thesis focuses to a great extent on the interaction between questions of a practical-legal nature and those whose character is more connected to legal theory. The point of departure of the discussion in the thesis is that some of the legal norms that are incorporated in the institution of the right of public access are customary law. Thus, the concept customary law is particularly considered, and the question of in what way the customary law can be filled with content raises special interest. A hypothesis is put forward in the thesis, which is that the right of public access constitutes part of those regulations whose purpose is that land should be used appropriately - seen from the societal perspective that land is a limited natural resource which should be used expediently, for the husbanding of resources. What is advocated in this thesis, is that in both the jurisprudential discussion about the right of public access and in the argumentation that is conducted in the practical legal application, the three subjects, the Actual User, the Canalizer and the Actual User in the Collective and their different use of the land, are separated. Further, it is advocated that the discussion as to which activities are allowed by the right of public access should be based on a consciousness that the activities can concern “everyday use” or “recreation” and that, depending on whether the activities are considered to concern the one or the other, different conclusions regarding the permissibility of the activities will be drawn. Furthermore, it is shown in the thesis that in conflicts between different means of using land, the courts seem to presume that all land is covered by the right of public access - a presumption that does not hold if the land is a part of somebody’s zone of home privacy, is needed for certain business or constitute biologically sensitive land.I denna avhandling studeras allemansrätten som rättsinstitut. Därvid aktualiseras flera sinsemellan olikartade frågeställningar. Avhandlingen fokuserar i stor utsträckning på samspelet mellan frågor av praktisk-juridiskt slag och sådana av mer rättsteoretiskt slag. Diskussionen i avhandlingen utgår från att vissa av de i institutet allemansrätten ingående rättsliga normerna är sedvanerätt. Därför diskuteras sedvanerättsbegreppet särskilt, varvid frågan hur sedvanerätt kan fyllas med ett innehåll väcker särskilt intresse. I avhandlingen uppställs en hypotes om att allemansrätten är en del av en reglering syftande till lämplig markanvändning - sett ur den samhälleliga synvinkeln att mark är en begränsad naturresurs som bör nyttjas ändamålsenligt, för hushållning med resurser. I avhandlingen förespråkas att man i såväl den rättsvetenskapliga diskussionen om allemansrätten, som i den argumentation som förs i den praktiska rättstillämpningen, särskiljer de tre subjekten utövaren, kanalisatören och utövaren i kollektivet och deras skilda nyttjande. Vidare förespråkas att diskussionen, om vilka aktiviteter som är allemansrättsligt tillåtna, sker utifrån en medvetenhet om att aktiviteterna kan avse ”vardagsnytta” eller ”rekreation” och att, beroende av om aktiviteterna antas avse det ena eller det andra, olika slutsatser angående aktiviteternas tillåtlighet kommer att dras. Därtill visas i avhandlingen att domstolen, i konflikter mellan olika sätt att nyttja marken, tycks presumera att all mark är allemansrättsligt tillgänglig - en presumtion som bryts om marken ingår i någons hemfridszon, behövs för vissa näringar eller utgör biologiskt känslig mark

An Off-line Scan of the BATSE Daily Records and a Large Uniform Sample of Gamma-Ray Bursts

During a scan of the archival BATSE daily records covering the entire 9.1 years (TJD 8369-11690) of the BATSE operation, 3906 gamma-ray bursts (GRBs) have been detected. 2068 of these GRBs are previously known BATSE triggers while 1838 of them are new non-triggered bursts. It is important that all events were detected in the same type of data and were processed with the same procedure. Therefore these 3906 GRBs constitute a uniform sample. We have created a publically available electronic data base containing this sample. We describe the procedures of the data reduction, the selection of the GRB candidates, and the statistical tests for possible non-GRB contaminations. We also describe a novel test burst method used to measure the scan efficiency and the information obtained using the test bursts. Our scan decreases the BATSE detection threshold to ~0.1 photons/sec/cm2. As a first result, we show that the differential log N - log P distribution corrected for the detection efficiency extends to low brightnesses without any indication of a turn-over. Any reasonable extrapolation of the new log N - log P to lower brightnesses imply a rate of several thousands of GRBs in the Universe per year.Comment: 14 pages; 23 figures; revised version accepted to ApJ; electronic version of Table 2 is available at ftp://ftp.astro.su.se/pub/head/grb/catalogs/etable2.txt The GRB archive is available at http://www.astro.su.se/groups/head/grb_archive.htm

The mystery of spectral breaks: Lyman continuum absorption by photon-photon pair production in the Fermi GeV spectra of bright blazars

We reanalyze Fermi/LAT gamma-ray spectra of bright blazars with a higher photon statistics than in previous works and with new Pass 7 data representation. In the spectra of the brightest blazar 3C 454.3 and possibly of 4C +21.35 we detect breaks at 5 GeV (in the rest frame) associated with the photon-photon pair production absorption by He II Lyman continuum (LyC). We also detect confident breaks at 20 GeV associated with hydrogen LyC both in the individual spectra and in the stacked redshift-corrected spectrum of several bright blazars. The detected breaks in the stacked spectra univocally prove that they are associated with atomic ultraviolet emission features of the quasar broad-line region (BLR). The dominance of the absorption by hydrogen Ly complex over He II, rather small detected optical depth, and the break energy consistent with the head-on collisions with LyC photons imply that the gamma-ray emission site is located within the BLR, but most of the BLR emission comes from a flat disk-like structure producing little opacity. Alternatively, the LyC emission region size might be larger than the BLR size measured from reverberation mapping, and/or the gamma-ray emitting region is extended. These solutions would resolve a long-standing issue how the multi-hundred GeV photons can escape from the emission zone without being absorbed by softer photons.Comment: 7 pages, 6 figures; accepted to Ap

A photon breeding mechanism for the high-energy emission of relativistic jets

We propose a straightforward and efficient mechanism for the high-energy emission of relativistic astrophysical jets associated with an exchange of interacting high-energy photons between the jet and the external environment. Physical processes playing the main role in this mechanism are electron-positron pair production by photons and the inverse Compton scattering. This scenario has been studied analytically as well as with numerical simulations demonstrating that a relativistic jet (with the Lorentz factor larger than 3--4) moving through the sufficiently dense, soft radiation field inevitably undergoes transformation into a luminous state. The process has a supercritical character: the high-energy photons breed exponentially being fed directly by the bulk kinetic energy of the jet. Eventually particles feed back on the fluid dynamics and the jet partially decelerates. As a result, a significant fraction (at least 20 per cent) of the jet kinetic energy is converted into radiation mainly in the MeV -- GeV energy range. The mechanism maybe responsible for the bulk of the emission of relativistic jets in active galactic nuclei, microquasars and gamma-ray bursts.Comment: 10 pages, 9 figures; MNRAS, in pres

Gamma-ray burst spectra from continuously accelerated electrons

We discuss here constraints on the particle acceleration models from the observed gamma-ray bursts spectra. The standard synchrotron shock model assumes that some fraction of available energy is given instantaneously to the electrons which are injected at high Lorentz factor. The emitted spectrum in that case corresponds to the spectrum of cooling electrons, F_\nu ~ \nu^{-1/2}, is much too soft to account for the majority of the observed spectral slopes. We show that continuous heating of electrons over the life-time of a source is needed to produce hard observed spectra. In this model, a prominent peak develops in the electron distribution at energy which is a strong function of Thomson optical depth \tau_T of heated electrons (pairs). At \tau_T>1, a typical electron Lorentz factor \gamma ~ 1-2 and quasi-thermal Comptonization operates. It produces spectrum peaking at a too high energy. Optical depths below 10^{-4} would be difficult to imagine in any physical scenario. At \tau_T =10^{-4}-10^{-2}, \gamma ~ 30-100 and synchrotron self-Compton radiation is the main emission mechanism. The synchrotron peak should be observed at 10--100 eV, while the self-absorbed low-energy tail with F_\nu ~ \nu^2 can produce the prompt optical emission (like in the case of GRB 990123). The first Compton scattering radiation by nearly monoenergetic electrons peaks in the BATSE energy band and can be as hard as F_\nu ~ \nu^1 reproducing the hardness of most of the observed GRB spectra. The second Compton peak should be observed in the high-energy gamma-ray band, possibly being responsible for the 10-100 MeV emission detected in GRB 941017. A significant electron-positron pair production reduces the available energy per particle, moving spectral peaks to lower energies as the burst progresses.Comment: 4 pages, 1 figure, Il nuovo cimento C, in press. Proceedings of the 4th Workshop Gamma-Ray Bursts in the Afterglow Era, Rome, 18-22 October 200

Reversible current control apparatus Patent

Reversible current directing circuitry for reversible motor contro

Soft gamma repeaters outside the Local group

We propose that the best sites to search for SGRs outside the Local group are galaxies with active massive star formation. Different possibilities to observe SGR activity from these sites are discussed. In particular we searched for giant flares from nearby galaxies ($\sim 2$ -- 4 Mpc) M82, M83, NGC 253, and NGC 4945 in the BATSE data. No candidates alike giant SGR flares were found. The absence of such detections implies that the rate of giant flares with energy release in the initial spike above $0.5 \cdot 10^{44}$ erg is less then 1/25 yr$^{-1}$ in our Galaxy. However, hyperflares similar to the one of 27 December 2004 can be observed from larger distances. Nevertheless, we do not see any significant excess of short GRBs from the Virgo galaxy cluster and from galaxies Arp 299 and NGC 3256 with extremely high star formation rate. This implies that the galactic rate of hyperflares with energy release $\sim 10^{46}$ erg is less than $\sim 10^{-3}$ yr$^{-1}$. With this constraint the fraction of possible extragalactic SGR hyperflares among BATSE short GRBs should not exceed few percents. We present a list of short GRBs coincident with galaxies mentioned above, and discuss the possibility that some of them are SGR giant flares. We propose that the best target for observations of extragalactic SGR flares by {\it Swift} is the Virgo cluster.Comment: 14 pages with 3 figures; accepted to MNRAS (final version

A systems approach to device-circuit interaction in electrical power processing Annual status report, 1 Jun. 1967 - 31 May 1968

Initial research on switched and modulated networks, tunable and bandwith-adjustable filter and FET current density for device circuit interaction in power processin