1,009 research outputs found
Leaving King Island: The Closure Of A Bureau Of Indian Affairs School And Its Consequences
Thesis (M.A.) University of Alaska Fairbanks, 2004By 1966, the King Island Inupiat had moved from their island village and lived at Nome. Little has been written about the de facto relocation of the King Islanders---and how and why it happened. What follows is an ethnohistory of the relocation based on the anthropology and history of the Bering Strait region, archival records of the Bureau of Indian Affairs and interviews with King Islanders in Nome. The heart of the matter was the village's school. Based on the evidence, the BIA closed the school because of the expense and inconvenience of operating at King Island. This accomplished what the BIA had been unable for decades to do by persuasion---to move the village to the mainland. The immediate result of the closure, the resettlement of the villagers in Nome, fits within the established pattern of BIA policy over time, one that had assimilation as its ultimate goal
Stable Branched Electron Flow
The pattern of branched electron flow revealed by scanning gate microscopy
shows the distribution of ballistic electron trajectories. The details of the
pattern are determined by the correlated potential of remote dopants with an
amplitude far below the Fermi energy. We find that the pattern persists even if
the electron density is significantly reduced such that the change in Fermi
energy exceeds the background potential amplitude. The branch pattern is robust
against changes in charge carrier density, but not against changes in the
background potential caused by additional illumination of the sample.Comment: Accepted for publication in New Journal of Physic
Electrophoretic deposition of carbon nanotubes: recent progress and remaining challenges
Electrophoretic deposition (EPD) is a powerful technique to assemble carbon nanotube (CNT) coatings and composite films with controlled architectures. This comprehensive review of the EPD of CNTs and CNT-containing composites focuses on achievements within the last 15 years and ongoing challenges. Stable CNT suspensions are a pre-requisite for successful EPD and have been prepared by a variety of strategies, discussed here. The resulting film microstructure is determined by the initial feedstock, the suspension, and the EPD approach applied, as well as a variety of EPD processing parameters. Nanocomposites can be prepared via co-deposition, sequential deposition, or post-deposition treatments, to introduce metallic, ceramic or polymeric phases. There are numerous potential applications for both homogeneous and patterned CNT films, including as structural reinforcements for composites, as field emission, energy storage and conversion devices, as well as in biomedical applications. The advantages and disadvantages of EPD processing in these contexts are discussed
Polychromatic femtosecond fluorescence studies of metalâpolypyridine complexes in solution
Femtosecond-resolved broadband fluorescence studies are reported for[M(bpy)3]2+ (M = Fe, Ru), RuN3
and RuN719 complexes in solution. We investigated the pump wavelength dependence of the fluorescence
of aqueous [Fe(bpy)3]2+ and the solvent and ligand dependence of the fluorescence of Ru-complexes
excited at 400 nm. For all complexes, the 1MLCT fluorescence appears at zero time delay with a
mirror-like image with respect to the absorption. It decays in 630â45 fs due to intersystem crossing to
the 3MLCT states, but a longer lived component of 190 fs additionally shows up in RuN719 and
RuN3. No solvent effects are detected. The very early dynamics are characterized by internal conversion
(IC) and intramolecular vibrational redistribution (IVR) processes on a time scale which we estimate to
610 fs using the 1MLCT lifetime as an internal clock
The current progress of the ALICE Ring Imaging Cherenkov Detector
Recently, the last two modules (out of seven) of the ALICE High Momentum
Particle Identification detector (HMPID) were assembled and tested. The full
detector, after a pre-commissioning phase, has been installed in the
experimental area, inside the ALICE solenoid, at the end of September 2006. In
this paper we review the status of the ALICE/HMPID project and we present a
summary of the series production of the CsI photo-cathodes. We describe the key
features of the production procedure which ensures high quality photo-cathodes
as well as the results of the quality assessment performed by means of a
specially developed 2D scanner system able to produce a detailed map of the CsI
photo-current over the entire photo-cathode surface.
Finally we present our recent R&D efforts toward the development of a novel
generation of imaging Cherenkov detectors with the aim to identify, in heavy
ions collisions, hadrons up to 30 GeV/c.Comment: Presented at the Imaging-2006 Conference, Stockholm, Sweden, June
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Ultrafast Excited-State Dynamics of Rhenium(I) Photosensitizers [Re(Cl)(CO)_(3)(N,N)] and [Re(imidazole)(CO)_(3)(N,N)]^+: Diimine Effects
Femto- to picosecond excited-state dynamics of the complexes [Re(L)(CO)_(3)(N,N)]^n (N,N = bpy, phen, 4,7-dimethyl-phen (dmp); L = Cl, n = 0; L = imidazole, n = 1+) were investigated using fluorescence up-conversion, transient absorption in the 650â285 nm range (using broad-band UV probe pulses around 300 nm) and picosecond time-resolved IR (TRIR) spectroscopy in the region of CO stretching vibrations. Optically populated singlet charge-transfer (CT) state(s) undergo femtosecond intersystem crossing to at least two hot triplet states with a rate that is faster in Cl (~100 fs)^(â1) than in imidazole (~150 fs)^(â1) complexes but essentially independent of the N,N ligand. TRIR spectra indicate the presence of two long-lived triplet states that are populated simultaneously and equilibrate in a few picoseconds. The minor state accounts for less than 20% of the relaxed excited population. UVâvis transient spectra were assigned using open-shell time-dependent density functional theory calculations on the lowest triplet CT state. Visible excited-state absorption originates mostly from mixed L;N,N^(âąâ) â Re^(II) ligand-to-metal CT transitions. Excited bpy complexes show the characteristic sharp near-UV band (Cl, 373 nm; imH, 365 nm) due to two predominantly ÏÏ*(bpy^(âąâ)) transitions. For phen and dmp, the UV excited-state absorption occurs at 305 nm, originating from a series of mixed ÏÏ* and Re â CO;N,Nâąâ MLCT transitions. UVâvis transient absorption features exhibit small intensity- and band-shape changes occurring with several lifetimes in the 1â5 ps range, while TRIR bands show small intensity changes (â€5 ps) and shifts (~1 and 6â10 ps) to higher wavenumbers. These spectral changes are attributable to convoluted electronic and vibrational relaxation steps and equilibration between the two lowest triplets. Still slower changes (â„15 ps), manifested mostly by the excited-state UV band, probably involve local-solvent restructuring. Implications of the observed excited-state behavior for the development and use of Re-based sensitizers and probes are discussed
Detecting Determinacy in Prolog Programs: 22nd International Conference, ICLP 2006, Seattle, WA, USA, August 17-20, 2006. Proceedings
In program development it is useful to know that a call to a Prolog program will not inadvertently leave a choice-point on the stack. Determinacy inference has been proposed for solving this problem yet the analysis was found to be wanting in that it could not infer determinacy conditions for programs that contained cuts or applied certain tests to select a clause. This paper shows how to remedy these serious deficiencies. It also addresses the problem of identifying those predicates which can be rewritten in a more deterministic fashion. To this end, a radically new form of determinacy inference is introduced, which is founded on ideas in ccp, that is capable of reasoning about the way bindings imposed by a rightmost goal can make a leftmost goal deterministic
A liquid Xenon Positron Emission Tomograph for small animal imaging : first experimental results of a prototype cell
A detector using liquid Xenon (LXe) in the scintillation mode is studied for
Positron Emission Tomography (PET) of small animals. Its specific design aims
at taking full advantage of the Liquid Xenon scintillation properties. This
paper reports on energy, time and spatial resolution capabilities of the first
LXe prototype module equipped with a Position Sensitive Photo- Multiplier tube
(PSPMT) operating in the VUV range (178 nm) and at 165 K. The experimental
results show that such a LXe PET configuration might be a promising solution
insensitive to any parallax effect.Comment: 34 pages, 18 pages, to appear in NIM
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