436 research outputs found
Test of a Liquid Argon TPC in a magnetic field and investigation of high temperature superconductors in liquid argon and nitrogen
Tests with cosmic ray muons of a small liquid argon time projection chamber
(LAr TPC) in a magnetic field of 0.55 T are described. No effect of the
magnetic field on the imaging properties were observed. In view of a future
large, magnetized LAr TPC, we investigated the possibility to operate a high
temperature superconducting (HTS) solenoid directly in the LAr of the detector.
The critical current of HTS cables in an external magnetic field was
measured at liquid nitrogen and liquid argon temperatures and a small prototype
HTS solenoid was built and tested.Comment: 5 pages, 5 figures, to appear in Proc. of 1st International Workshop
towards the Giant Liquid Argon Charge Imaging Experiment (GLA2010), Tsukuba
(Japan), March 201
First operation of a liquid Argon TPC embedded in a magnetic field
We have operated for the first time a liquid Argon TPC immersed in a magnetic
field up to 0.55 T. We show that the imaging properties of the detector are not
affected by the presence of the magnetic field. The magnetic bending of the
ionizing particle allows to discriminate their charge and estimate their
momentum. These figures were up to now not accessible in the non-magnetized
liquid Argon TPC.Comment: 9 pages, 3 figure
una rielaborazione umanistica dell albero di porfirio l animal nella dialettica di lorenzo valla
Examinando a árvore de Porfírio, Lorenzo V alia conclui que, por ela, tanto se pode atribuir alma aos simples vegetais, como a Deus como animal imortal. Por isso, propõe uma reelaboração da árvore em dois troncos principais, um referente à substância corpórea e outro à incorpórea
Feasibility of high-voltage systems for a very long drift in liquid argon TPCs
Designs of high-voltage (HV) systems for creating a drift electric field in
liquid argon TPCs are reviewed. In ongoing experiments systems capable of
approx. 100 kV are realised for a drift field of 0.5-1 kV/cm over a length of
up to 1.5 m. Two of them having different approaches are presented: (1) the
ICARUS-T600 detector having a system consisting of an external power supply, HV
feedthroughs and resistive voltage degraders and (2) the ArDM-1t detector
having a cryogenic Greinacher HV multiplier inside the liquid argon volume. For
a giant scale liquid argon TPC, a system providing 2 MV may be required to
attain a drift length of approx. 20 m. Feasibility of such a system is
evaluated by extrapolating the existing designs.Comment: 8 pages, 13 figures, to appear in Proc. of 1st International Workshop
towards the Giant Liquid Argon Charge Imaging Experiment (GLA2010), Tsukuba
(Japan), March 201
Patterns of funerary variability, diet, and developmental stress in a Celtic population from NE Italy (3rd-1st c BC)
Little is known about the types of social organization characterizing the pre-Roman Celtic
populations of Italy. Here, we explore the funerary variability characterizing the late Iron Age
site of Seminario Vescovile (SV: Verona, Italy, 3rd-1st c. BC), and test its possible correlation
to diet and relative exposure to developmental stressors. Patterns on funerary treatment
(N = 125), δ13C and δ15N (N = 90), and linear enamel hypoplasia (N = 47) from SV are compared,
and their possible association with sex and age-at-death further discussed. Results
point to the presence at SV of variable funerary customs while at the same time demonstrating
a rather homogenous diet and exposure to developmental stressors: funerary treatment
is mainly correlated to age-at-death but do not appear to be associated to either isotopic patterns
or hypoplasia frequencies. Accordingly, even if some weak social differentiation may
have characterized the individuals buried at SV, this was not reflected in markedly differing
living conditions. Our study is the first to attempt an exploration of the links between age,
sex, funerary variability, and diet in a pre-Roman Celtic community from Italy. While
highlighting the potential of a multifaceted approach in bioarcheology, it also points to a
series of analytical and theoretical issues relevant when trying to disentangle the cultural
and biological dimensions of social differentiation in the past
Patterns of funerary variability, diet, and developmental stress in a Celtic population from NE Italy (3rd-1st c BC)
Little is known about the types of social organization characterizing the pre-Roman Celtic
populations of Italy. Here, we explore the funerary variability characterizing the late Iron Age
site of Seminario Vescovile (SV: Verona, Italy, 3rd-1st c. BC), and test its possible correlation
to diet and relative exposure to developmental stressors. Patterns on funerary treatment
(N = 125), δ13C and δ15N (N = 90), and linear enamel hypoplasia (N = 47) from SV are compared,
and their possible association with sex and age-at-death further discussed. Results
point to the presence at SV of variable funerary customs while at the same time demonstrating
a rather homogenous diet and exposure to developmental stressors: funerary treatment
is mainly correlated to age-at-death but do not appear to be associated to either isotopic patterns
or hypoplasia frequencies. Accordingly, even if some weak social differentiation may
have characterized the individuals buried at SV, this was not reflected in markedly differing
living conditions. Our study is the first to attempt an exploration of the links between age,
sex, funerary variability, and diet in a pre-Roman Celtic community from Italy. While
highlighting the potential of a multifaceted approach in bioarcheology, it also points to a
series of analytical and theoretical issues relevant when trying to disentangle the cultural
and biological dimensions of social differentiation in the past
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