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The X-ray Universe 2011; 08/2011
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ABSTRACT: This paper demonstrates that existing upper bounds on the magnitude of cosmological dark matter and baryon isocurvature fluctuations can be translated into stringent constraints on the parameter space of moduli fields of supersymmetric theories, defined in terms of mσ (modulus mass) and σinf (modulus vacuum expectation value at the end of inflation). For the sake of concreteness, we assume here a quadractic modulus potential and we focus on high-scale inflationary models. These constraints are complementary to previously existing bounds from big-bang nucleosynthesis, therefore the moduli problem becomes worse at the level of cosmological perturbations. In particular, if the inflationary scale Hinf~1013 GeV, particle physics scenarios which predict high moduli masses mσ 10–100 TeV are plagued by the perturbative moduli problem, even though they evade big-bang nucleosynthesis constraints. This perturbative moduli problem is somewhat relaxed if the modulus is made heavy during inflation, with effective mass Hinf.
EPL (Europhysics Letters) 02/2010; 89(2):29001. · 2.17 Impact Factor
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ABSTRACT: In recent years, the coconut whitefly, Aleurotrachelus atratus Hempel, has been recorded from various islands in the southwestern Indian Ocean. Field surveys in La Réunion, the Seychelles, the Comoros and glasshouses in Paris have allowed us to record this whitefly on 56 palm species, some of which are endemic and/or threatened species. Most of trees showed low infestation levels, except for the coconut palm that is its main host plant. Such a wide host range has facilitated the rapid geographical dissemination of this whitefly. A field study was conducted in 2006 in La Réunion, to gain a better understanding of the bioecology of A. atratus in a tropical insular ecosystem. The whitefly was found throughout the island, from sea level to 800-m altitude. Five parasitoid species (Hymenoptera: Aphelinidae) were found associated with the populations of this pest, with Eretmocerus cocois Delvare being the dominant one. A laboratory study showed that the pre-imaginal development of A. atratus is around 48 days at 25–27°C, which is relatively long compared to other whitefly species. With a sex ratio of one male per 1022 females collected in La Réunion, it appears that the whitefly reproduces by thelytoky. It represents a threat to ornamental and agricultural palms as well as to natural palm ecosystems in the absence of effective parasitoids.
Journal of Applied Entomology 10/2009; 134(6):498 - 510. · 1.31 Impact Factor
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ABSTRACT: Polarized Raman microspectroscopy has been used to study oriented-skin layers induced in injection-molded isotactic polypropylene (iPP) parts. A method based on the intensity sensitivity of several Raman bands to laser light polarization was employed to estimate the degree of molecular orientation in iPP. The skin-core molecular orientation heterogeneity in injection-molded iPP is then evaluated via two different experimental methods. Results show that an in-depth profile using micro-Raman confocal technique is as valuable as an edge profile performed on a sample cross-section because both are correlated with optical microscopy measurements. Both Raman measurements are in good agreement with optical microscopy measurements. The skin development was found to be narrowly related to the shear strain rate at the mold walls. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers
Polymer Engineering and Science 09/2009; 50(1):138 - 143. · 1.30 Impact Factor
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The CMS Collaboration,
S Chatrchyan,
G Hmayakyan,
V Khachatryan,
A M Sirunyan,
W Adam,
T Bauer,
T Bergauer,
H Bergauer,
M Dragicevic, [......],
G Abdullaeva,
A Avezov,
M I Fazylov,
E M Gasanov,
A Khugaev,
Y N Koblik,
M Nishonov,
K Olimov,
A Umaraliev,
B S Yuldashev
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ABSTRACT: The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 1034 cm−2 s−1 (1027 cm−2 s−1). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4π solid angle. Forward sampling calorimeters extend the pseudorapidity coverage to high values (|η| ≤ 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.
Journal of Instrumentation 08/2008; 3(08):S08004. · 1.87 Impact Factor
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Ibis 08/2008; 151(1):181 - 185. · 2.43 Impact Factor
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R. HENRY,
P. SLY,
S. GODFREY,
P. VAN ASPEREN,
R. STAUGAS,
P. LE SOUEF,
G. SMITH,
I. ROBERTSON,
C. ROBERTSON,
P. PHELAN, [......],
L. LANDAU,
A. KEMP,
A. ISLES,
M. HARRIS,
P. FRANCIS,
K. DAWSON,
P. COOPER,
D. COOPER,
I. ASHER,
H. ALLEN
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ABSTRACT: Abstract In June 1990 a meeting of Paediatric Respiratory Physicians was held near Adelaide. The guidelines for assessing and treating asthma as prepared by the Thoracic Society of Australia and New Zealand for the management of patients with asthma was considered. Although not explicitly stated, these guidelines were designed for adult asthmatics. There was complete agreement that a companion statement was needed to take into account differences between the management of children and adults. This document fulfils that role. Further recommendations are found in a statement prepared by Australian and New Zealand respiratory paediatricians following a workshop in June 1989. This present statement should be read in association with the previous documents.1,2
Journal of Paediatrics and Child Health 03/2008; 27(4):218 - 220. · 1.28 Impact Factor
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R. HENRY,
L. LANDAU,
C. MELLIS,
P. ASPEREN,
J. MORTON,
P. COOPER,
D. COOPER,
A. KEMP,
C. ROBERTSON,
P. PHELAN,
P. SLY,
R. STAUGAS, J. MARTIN,
A. ISLES,
B. MASTERS,
P. LeSOUEF,
J. HOBDAY,
E. MITCHELL,
I. ASHER,
K. DAWSON
Journal of Paediatrics and Child Health 03/2008; 26(2):72 - 74. · 1.28 Impact Factor
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K. DAWSON,
D. KENNEDY,
I. ASHER,
D. COOPER,
P. COOPER,
P. FRANCIS,
R. HENRY,
P. LE SOUEF, J. MARTIN,
B. MASTERS,
C. MELLIS,
J. MORTON,
A. OLINSKY,
C. F. ROBERTSON,
P. J. ROBINSON,
P. SLY,
R. STAUGAS,
P. VAN ASPEREN,
P. PATTERMORE
Journal of Paediatrics and Child Health 03/2008; 29(5):335 - 337. · 1.28 Impact Factor
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K. Davidson, J. Martin,
R. M. Humphreys,
K. Ishibashi,
T. R. Gull,
O. Stahl,
K. Weis,
D. J. Hillier,
A. Damineli,
M. Corcoran,
and F. Hamann
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ABSTRACT: During η Car's spectroscopic event in mid-2003, the stellar wind's bright Hα and Hβ emission lines temporarily had a distinctive shape unlike that reported on any previous occasion and particularly unlike the 1997–1998 event. Evidently the structure of the wind changed between 1997 and 2003. Combining this with other evidence, we suspect that the star may now be passing through a rapid stage in its recovery from the Great Eruption seen 160 years ago. In any case, the data indicate that successive spectroscopic events differ, and the hydrogen line profiles are quantitative clues to the abnormal structure of the wind during a spectroscopic event.
The Astronomical Journal 12/2007; 129(2):900. · 4.03 Impact Factor
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ABSTRACT: The novel, partially filled compounds CexCo4Ge6Se6 were synthesized using two methods: low-temperature interdiffusion and nucleation of ultrathin elemental layers and a bulk, high-temperature technique. The compounds were characterized by differential scanning calorimetry, powder X-ray diffraction, and electron probe microanalysis. The lattice parameters for the samples synthesized using the high-temperature technique were calculated to be 8.30 Å, while the samples synthesized using the elemental deposition technique showed lattice expansion proportional to the amount of incorporated rare earth element, with lattice parameters ranging from 8.30 Å for x = 0 up to a lattice parameter of 8.34 Å for x = 0.2. Rietveld analysis on X-ray diffraction data for both sets of samples showed incorporation of the rare earth element into the interstitial site, up to 20% occupancy.
11/2007;
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12/2006: pages 203-214;
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ABSTRACT: An experimental program has been completed to study the behaviour of sheath wall temperatures in the Bruce Power Station Low Void Reactivity Fuel (shortened hereafter to Bruce LVRF) bundles under post-dryout (PDO) heat-transfer conditions. The experiment was conducted with an electrically heated simulator of a string of nine Bruce LVRF bundles, installed in the MR-3 Freon heat transfer loop at the Chalk River Laboratories (CRL), Atomic Energy of Canada Limited (AECL). The loop used Freon R-134a as a coolant to simulate typical flow conditions in CANDU{sup R} nuclear power stations. The simulator had an axially uniform heat flux profile. Two radial heat flux profiles were tested: a fresh Bruce LVRF profile and a fresh natural uranium (NU) profile. For a given set of flow conditions, the channel power was set above the critical power to achieve dryout, while heater-element wall temperatures were recorded at various overpower levels using sliding thermocouples. The maximum experimental overpower achieved was 64%. For the conditions tested, the results showed that initial dryout occurred at an inner-ring element at low flows and an outer-ring element facing internal subchannels at high flows. Dry-patches (regions of dryout) spread with increasing channel power; maximum wall temperatures were observed at the downstream end of the simulator, and immediately upstream of the mid-bundle spacer plane. In general, maximum wall temperatures were observed at the outer-ring elements facing the internal subchannels. The maximum water-equivalent temperature obtained in the test, at an overpower level of 64%, was significantly below the acceptable maximum temperature, indicating that the integrity of the Bruce LVRF will be maintained at PDO conditions. Therefore, the Bruce LVRF exhibits good PDO heat transfer performance. (authors)
06/2006
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ABSTRACT: The lattice parameter of silicon plays an important role in the determination of the Avogadro constant and the fine-structure constant. Today, three values of the d220 silicon lattice spacing are available, measured at the Physikalisch-Technische Bundesanstalt (PTB, Germany), the Istituto di Metrologia "G. Colonnetti" (IMGC, Italy) and the National Research Laboratory of Metrology (NRLM, Japan) and based on the metre scale. Using the PTB lattice spacing comparator, the spacings of the different materials were measured and compared with one another in order to check the possibility of combining the results to form a common "best" value. The characterization of the relevant impurities and crystal defects and their number densities are discussed and corrections applied for their influences on the interatomic distances. The NRLM data are in disagreement with those of the PTB and the IMGC, from which a lattice parameter for a hypothetical, ideal, perfect Si crystal was derived with a relative uncertainty of about .
Metrologia 03/2003; 35(6):811. · 1.75 Impact Factor
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04/2002;
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ABSTRACT: Mean lifetimes have been measured by the Doppler shift attenuation method for several nuclei in the s-d shell. Both Ge(Li) and NaI(Tl) detectors were used. The results (in ps) for the energy levels indicated in parenthesis (MeV) were: 24Mg(1.37)2.07+or-0.34, (4.23) 0.110+or-0.026; 30Si(2.23)0.332+or-0.021, (3.51) 0.063+or-0.0015; 34S (2.13) 0.467+or-0.090, (3.30) 0.144+or- 0.028; 38Ar (2.17) 0.473-0.110+0.145, (3.38) 25 -12+ infinity , 40Ar(1.46) 2.45 -1.30+18.
Journal of Physics A: General Physics. 03/2001; 3(1):73.
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ABSTRACT: The aim of this paper is to explore the early family environment of a sample of female sex workers and compare the findings with a large community data set of similarly aged women.
Sex workers recruited by a snowball method were given a semi-structured interview, which included the Parental Bonding Instrument. These results were compared to those from the Otago Women's Child Sexual Abuse (OWCSA) study.
The sex workers' families were of lower socioeconomic status and had experienced more parental separation than had the OWCSA families. The mothers of sex workers were more frequently the family's main wage earner. Sex workers described both parents as less caring than did the OWCSA women. They were significantly more likely than the OWCSA women to report childhood sexual abuse. The sex workers were more likely to have left home early, to have become pregnant before the age of 19 years and to not have completed tertiary study.
The sex workers studied came from families with more interpersonal difficulties during childhood and adolescence than did a control community sample of similarly aged women. The relevance and generalisability of this conclusion to the wider sex worker population is difficult to determine, given the non-random selection of this sex worker sample.
Australian and New Zealand Journal of Psychiatry 12/1999; 33(6):935-40. · 2.93 Impact Factor
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ABSTRACT: A new exact asymptotically flat solution of the Einstein equations able to describe the exterior gravitational field of a static mass possessing a quadrupole moment is presented in explicit form. In contrast with the known solutions of this type earlier obtained by Erez and Rosen(1959) and Gutsunaev and Manko(1985), this solution represents a small deformation of the Schwarzschild solution.
Classical and Quantum Gravity 12/1998; 10(12):2581. · 3.32 Impact Factor
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ABSTRACT: We study the change of signature of the metric in a five-dimensional Kaluza-Klein theory applied to the description of a primordial cosmology. A model is constructed in which the one-dimensional internal space with the topology of S1 is created in the Euclidean region. We also consider the modified case, when the Gauss-Bonnet term is added to the Lagrangian. It produces the inflation of the four-dimensional Robertson-Walker metric, impossible to obtain with the Einstein-Hilbert Lagrangian.
Classical and Quantum Gravity 12/1998; 10(10):2111. · 3.32 Impact Factor
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ABSTRACT: The tricolporate pollen grains of 38 Mediterranean and Macaronesian species ofEuphorbia L. andChamaesyce
S. F. Gray have a special apertural sporoderm not found in the other taxa of theEuphorbiaceae. At the apertural margo the ectexine is thinner because of shorter columellae and the thin, fragmented or even absent foot-layer. Ectexinous granules, mixed with endexinous material, are present near the ora. The endexine is homogeneous and thickened under the colpi (at the end and at the proximity of the end of colpus). Around the ora, the endexine is granulate and lamellar with irregular cavities. The apertural intine presents a characteristic structure with thickenings running along both sides of the colpi. The arrangement and structure of these intinous thickenings depend on the distance from the ora. This special morphology of the intine is present in all taxa studied here. The genusEuphorbia is considered to be the most evolved taxon of this family. The characteristic apertural sporoderm may be an adaptative modification to different physiological conditions, so it may present an apertural mechanism which is more adapted to harmomegathic changes and thus facilitate the germination and the formation of the pollen tube.
Plant Systematics and Evolution 02/1995; 197(1):111-122. · 1.34 Impact Factor
