44,976 research outputs found
Results of integrated magnetic and GPR surveys in the St. Vincenzo archaeological site (Stromboli Island, Italy)
No full textIdentification of buried cultural heritage in geophysical records is
hampered by the often irregular geometry and by the limited
target/background contrast. Data integration offers a viable solution in favorable cases and in particular for areal mapping of buried foundations or building remains through the integration of magnetic and GPR surveys.
Irregular and isolated targets, lacking lateral continuity and identifiable geome t r i c p a t t e r n , a r e c h a r a c t e r i s t i c o f pre- and proto- historic sites and require complementary strategies to achieve optimum interpretation results. We propose and test a combined 2.5/3-D GPR survey strategy based on single-fold and mul t i - fold data, integrated by magnetic
(gradiometric) surveys. GPR data analysis is based on standard
section/volume interpretation complemented by multi-attribute and wavelet analysis for the identification of targets of potential
archeological interest. The method is tested on a dataset from the St. Vincenzo protohistoric site (Stromboli Island, Italy). The results give evidence of many often superimposed buried remains and allow detailed pre-excavation planning. Geophysical outcomes are validated by the archaeological excavation that identified remains of a Middle-Bronze Age (1650-1400 B.C.) village and most recent structures and objects
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Study of the orientational order and dynamics in the nematic and smectic phases of p'-hexyloxybenzyliden-p-fluoroaniline by means of H-2-NMR
No full textMeasurements of orientational order parameters and spectral densities of motion in the nematic, smectic A and smectic B phases of p'- hexyloxybenzyliden-p-fluoroaniline,fully deuterated in the chain and partially deuterated in the aniline ring, are reported. The deuterium spin-lattice (Tlz) and quadrupolar ( T ~ Qr)elaxation times have been measured at 46.04 MHz using a broadband multiple pulse Jeener-Broekaert sequence. The orientational order of the C-D bonds and the spectral densities determined suggest that, on entering the highly ordered smectic phases, the internal motions of the first two methylene groups in the chain slow down sensibly. These effects are discussed within the framework of the models used to describe molecular and internal dynamics in mesomorphicphases
Letter from Carl T. Hayden to C. H. Gensler, Havasupai Reservation
No full textLetter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography
Metodologie geofisiche integrate per indagini archeologiche nella zona di Flambruzzo (Udine)
No full textDection of hepatitis A Virus (HAV) in shellfish (Mytilus galloprovincialis) using RT-PCR
No full textA PCR assay for the detection of hepatitis A virus (HAV) in shellfish is described. The procedure involves the concentration of viral particles with the use of polyethylene glycol (PEG), followed by viral RNA extraction and purification with oligo(dT) cellulose. Reverse transcriptase-PCR detection was accomplished in a single step with the use of primers specific for the VP3-VP1 region of the genome. The procedure detected one 50% tissue culture infective dose (0.6 PFU) per 25 g of shellfish homogenate. Heminested PCR was then carried out to verify the specificity of the PCR products. The method was used to detect HAV in shellfish samples from EU categories B and C and to evaluate the quality of shellfish in routine monitoring for HAV in view of the relevant public health implications of this foodborne disease
Boron nitride nanotubes for boron neutron capture therapy as contrast agents in magnetic resonance imaging at 3 T
No full textThe applicability of boron nitride nanotubes (BNNTs) containing Fe paramagnetic impurities as contrast agents in magnetic resonance imaging (MRI) was investigated. The measurement of longitudinal and transverse relaxation times of water protons in homogeneous aqueous dispersions of BNNTs wrapped with poly(L-lysine) at different concentrations allowed longitudinal (r(1)) and transverse (r(2)) relaxivities to be determined at 3T. The r(2) value was comparable to those of commercial superparamagnetic iron oxide nanoparticles, indicating that Fe-containing BNNTs have the potential to be used as T(2) contrast-enhancement agents in MRI at 3
The IUO/BU Archaeological Project at Bieta Giyorgis (Aksum), Ethiopia: Archaeological Results and Computer Applications
No full textThe paper deals with the main results of the Italian-American archaeological research project at Bieta Giyorgis, N of Aksum (Tigrai, Ethiopia). The computer applications used in the management and interpretation of the collected data are discussed
A possible mechanism of superconductivity in high-T-c cuprates
No full textThis paper derives a generic T-c formula by using the long-range phase coherence condition in quantum phase fluctuation of the order parameter. Taking the two-local-spin-mediated interaction (TLSMI) proposed by Liu and Chen [Phys. Rev. B 58 (1998) 8812] as a Cooper pair potential, and the T-c formula, this paper explains five basic experimental facts in high-T-c cuprates. The aim of this paper is to show that TLSMI is a possible pairing mechanism of superconductivity in high-T-c cuprates. (C) 2000 Elsevier Science B.V. All rights reserved.Physics, AppliedSCI(E)EI0ARTICLE4276-28434
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