12,340 research outputs found
Light propagation and fluorescence quantum yields in liquid scintillators
For the simulation of the scintillation and Cherenkov light propagation in
large liquid scintillator detectors a detailed knowledge about the absorption
and emission spectra of the scintillator molecules is mandatory. Furthermore
reemission probabilities and quantum yields of the scintillator components
influence the light propagation inside the liquid. Absorption and emission
properties are presented for liquid scintillators using 2,5-Diphenyloxazole
(PPO) and 4-bis-(2-Methylstyryl)benzene (bis-MSB) as primary and secondary
wavelength shifter. New measurements of the quantum yields for various aromatic
molecules are shown.Comment: 11 pages, 3 figures, 1 tabl
Correlations in nuclear energy recurrence relations
The excitation energies of states belonging to the ground state bands of
heavy even-even nuclei are analysed using recurrence relations. Excellent
agreement with experimental data at the 10 keV level is obtained by taking into
account strong correlations which emerge in the analysis. This implies that the
excitation energies can be written as a polynomial of maximum degree four in
the angular momentum.Comment: 4 pages, 1 figure, 1 table, 9 reference
Pyroclastic deposits and volcanic history of Mayor Island
The emergent summit of Mayor Island, Bay of Plenty, New Zealand, is a peralkaline rhyolite volcano constructed by: a sequence of lava flows, the Tutaretare Rhyolite Formation new; and pyroclastic deposits, the Oira Pyroclastite Formition (new). These 2 formations constitute the Mayor Island Group new. The pyroclastic deposits mantle most of the outer slopes of the island, in places exceeding 100 m in thickness, and also occur interbedded with lava flows of the main cone. The pyroclastics have been informally assigned on the basis of their compositional, welding and textural, and sedimentary structural characteristics to one or other of 15 lithotypes which may be related to particular modes of eruption and emplacement, of both airfall (phreatic, phreatomagmatic, phreatoplinian, and plinian types) and pyroclastic flow (ignimbrite, nuée ardente, and base surge types origins). A sixteenth lithotype comprises epiclastic deposits formed possibly by catastrophic overspill from an ancestral crater lake. Two new radiocarbon dates on logs from the pyroclastic deposits are recorded: (Wk105) 8000 ± 70 years B.P., and (Wk77) 6340 ± 190 years B.P. Recognition of the calcalkaline Rotoehu and possibly Rotoma Ashes on Mayor Island, together with the new radiocarbon dates, enables definition of 8 phases of major volcanic activity, each separated by relatively quiescent periods with erosion and paleosol formation. Volcanism commenced sometime prior to 42 000 years ago and has continued intermittently up to the eruption of the young dome lavas, possibly less than 1000 years ago. At present, only I Mayor Island-derived tephra has been identified on the mainland of the North Island, namely the Tuhua Tephra dated (Wk77) at source as 6340 ± 190 years B .P. However, the character and magnitude of several of the pyroclastic units on Mayor Island is such that recognition of other peralkaline tephras is anticipated in northern North Island
CONTRACTUAL GOVERNANCE OF ONLINE COMMUNITIES â (PROPERTY) RIGHTS DISPUTES IN VIRTUAL WORLDS
Considering lawâs difficult ride on the coattails of societal and technological progress, this thesis discusses property rights disputes in virtual worlds, the origin and foundation of (property) rights in characters, objects and items (virtual assets), and the possibility of contractual governance. Investing considerable time, effort and money to create, develop and accumulate virtual assets to gain prestige or competitive advantage, or simply to have more fun playing, users often build strong emotional connections to their characters and place a high value on accumulated operator, third user and user-generated content. But the userâs experience of virtual assets as property, contrasts starkly with most in-world property models where first property rights belong to the operator, subsequent rights are delineated by contract, and emerging property rights are transferred to the operator or waived by the user. Noting the âtechnologically inaccurate portrayal of softwareâ in legislation, jurisprudence and legal debate, that ignores its âphysical properties of mass and volumeâ, and the influence of client/server system architecture on the allocation of personal property rights, this thesis shows that physical and intellectual rights cannot resolve the newly emerging property rights disputes in virtual worlds. Instead of making another helpless attempt to justify a new virtual property right that still cannot overcome an enforceable transfer/waiver of (future) (property) rights clause in the contract, this author questions common concepts of property and proposes a new quasi-property right. Originated in the contractual obligation of the operator to grant the user a right to use, to exclude other users from and to transfer virtual assets, the rules of conduct included in the multiple-separate user contract complete its quasi-absolute effect. This quasi-property right does not only complement the quasi-tort, quasi-criminal and quasi-constitutional system already established by the (virtual social) contract but supports the identification of the contract (terms) as new default legal rules for VWs and similar online communities
Large scale Gd-beta-diketonate based organic liquid scintillator production for antineutrino detection
Over the course of several decades, organic liquid scintillators have formed
the basis for successful neutrino detectors. Gadolinium-loaded liquid
scintillators provide efficient background suppression for electron
antineutrino detection at nuclear reactor plants. In the Double Chooz reactor
antineutrino experiment, a newly developed beta-diketonate gadolinium-loaded
scintillator is utilized for the first time. Its large scale production and
characterization are described. A new, light yield matched metal-free companion
scintillator is presented. Both organic liquids comprise the target and "Gamma
Catcher" of the Double Chooz detectors.Comment: 16 pages, 4 figures, 5 table
Large scale Gd-beta-diketonate based organic liquid scintillator production for antineutrino detection
Over the course of several decades, organic liquid scintillators have formed
the basis for successful neutrino detectors. Gadolinium-loaded liquid
scintillators provide efficient background suppression for electron
antineutrino detection at nuclear reactor plants. In the Double Chooz reactor
antineutrino experiment, a newly developed beta-diketonate gadolinium-loaded
scintillator is utilized for the first time. Its large scale production and
characterization are described. A new, light yield matched metal-free companion
scintillator is presented. Both organic liquids comprise the target and "Gamma
Catcher" of the Double Chooz detectors.Comment: 16 pages, 4 figures, 5 table
Large scale Gd-beta-diketonate based organic liquid scintillator production for antineutrino detection
Over the course of several decades, organic liquid scintillators have formed
the basis for successful neutrino detectors. Gadolinium-loaded liquid
scintillators provide efficient background suppression for electron
antineutrino detection at nuclear reactor plants. In the Double Chooz reactor
antineutrino experiment, a newly developed beta-diketonate gadolinium-loaded
scintillator is utilized for the first time. Its large scale production and
characterization are described. A new, light yield matched metal-free companion
scintillator is presented. Both organic liquids comprise the target and "Gamma
Catcher" of the Double Chooz detectors.Comment: 16 pages, 4 figures, 5 table
Welcome to Maxwell Montes
This poster poses Venus as a travel destination through a fictional travel agency, Venusian Journeys, and provides facts about the planet, the continent Ishtar Terra and its highest point, Maxwell Montes. This is a project for the Natural Sciences Poster Session at Parkland College
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