Lamprophyric intrusions of probable carbonatitic affinity from South Australia     

D. H. Tucker  K. D. Collerson 《Australian Journal of Earth Sciences》2013,60(3):387-391

Primary carbonate‐bearing lamprophyric rocks have been recognised in the Walloway Diapir, South Australia. Their petrography and trace‐element geochemistry indicates that they have carbonatitic affinities. The rocks are magnetic and can be detected by ground magnetometer surveys.  相似文献   

The Einstein polarization interferometer for cosmology (EPIC) and the millimeter-wave bolometric interferometer (MBI)     

P.T. Timbie  G.S. Tucker  P.A.R. Ade  S. Ali  E. Bierman  E.F. Bunn  C. Calderon  A.C. Gault  P.O. Hyland  B.G. Keating  J. Kim  A. Korotkov  S.S. Malu  P. Mauskopf  J.A. Murphy  C. O&#x;Sullivan  L. Piccirillo  B.D. Wandelt 《New Astronomy Reviews》2006,50(11-12):999

We provide an overview of a mission concept study underway for the Einstein Inflation Probe (EIP). Our study investigates the advantages and tradeoffs of using an interferometer (EPIC) for the mission. We also report on the status of the millimeter-wave bolometric interferometer (MBI), a ground-based pathfinder optimized for degree-scale CMB polarization measurements at 90 GHz.  相似文献   

Bolometric interferometry: the millimeter-wave bolometric interferometer     

G. S. Tucker  J. Kim  P. Timbie  S. Ali  L. Piccirillo  C. Calderon 《New Astronomy Reviews》2003,47(11-12):1173

Bolometric interferometry is not a new idea, but this technique has not been demonstrated at millimeter wavelengths. The millimeter-wave bolometric interferometer combines the advantages of two well-developed technologies – interferometers and bolometric detectors – and will open a new region of sensitivity and angular resolution not previously accessible to other instruments.  相似文献   

First ground-based 200-μm observing with THUMPER on JCMT – sky characterization and planet maps     

D. Ward-Thompson  P. A. R. Ade  H. Araujo  I. Coulson  J. Cox  G. R. Davis  Rh. Evans  M. J. Griffin  W. K. Gear  P. Hargrave  P. Hargreaves  D. Hayton  B. J. Kiernan  S. J. Leeks  P. Mauskopf  D. Naylor  N. Potter  S. A. Rinehart  R. Sudiwala  C. R. Tucker  R. J. Walker  S. L. Watkin 《Monthly notices of the Royal Astronomical Society》2005,364(3):843-848

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Lateglacial to Holocene relative sea‐level changes in the Bjarkarlundur area near Reykhólar,North West Iceland     

Jerry M. Lloyd  Hreggviður Norðdahl  Michael J. Bentley  Anthony J. Newton  Owen Tucker  Yongqiang Zong 《第四纪科学杂志》2009,24(7):816-831

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The optical performance of the PILOT instrument from ground end-to-end tests     

R. Misawa  J-Ph. Bernard  Y. Longval  I. Ristorcelli  P. Ade  D. Alina  Y. André  J. Aumont  L. Bautista  P. de Bernardis  O. Boulade  F. Bousqet  M. Bouzit  V. Buttice  A. Caillat  M. Chaigneau  M. Charra  B. Crane  F. Douchin  E. Doumayrou  J. P. Dubois  C. Engel  M. Griffin  G. Foenard  S. Grabarnik  P. Hargrave  A. Hughes  R. Laureijs  B. Leriche  S. Maestre  B. Maffei  C. Marty  W. Marty  S. Masi  J. Montel  L. Montier  B. Mot  J. Narbonne  F. Pajot  E. Pérot  J. Pimentao  G. Pisano  N. Ponthieu  L. Rodriguez  G. Roudil  M. Salatino  G. Savini  O. Simonella  M. Saccoccio  J. Tauber  C. Tucker 《Experimental Astronomy》2017,43(3):211-235

The Polarized Instrument for Long-wavelength Observation of the Tenuous interstellar medium (PILOT) is a balloon-borne astronomy experiment designed to study the linear polarization of thermal dust emission in two photometric bands centred at wavelengths 240 μm (1.2 THz) and 550 μm (545 GHz), with an angular resolution of a few arcminutes. Several end-to-end tests of the instrument were performed on the ground between 2012 and 2014, in order to prepare for the first scientific flight of the experiment that took place in September 2015 from Timmins, Ontario, Canada. This paper presents the results of those tests, focussing on an evaluation of the instrument’s optical performance. We quantify image quality across the extent of the focal plane, and describe the tests that we conducted to determine the focal plane geometry, the optimal focus position, and sources of internal straylight. We present estimates of the detector response, obtained using an internal calibration source, and estimates of the background intensity and background polarization.  相似文献   

Voids in the Las Campanas Redshift Survey versus cold dark matter models     

V. Müller  S. Arbabi-Bidgoli  J. Einasto  D. Tucker 《Monthly notices of the Royal Astronomical Society》2000,318(1):280-288

We analysed the distribution of void sizes in the two-dimensional slices of the Las Campanas Redshift Survey (LCRS). Fourteen volume-limited subsamples were extracted from the six slices to cover a large part of the survey and to test the robustness of the results against cosmic variance. Thirteen samples were randomly culled to produce homogeneously selected samples. We then studied the relationship between the cumulative area covered by voids and the void size as a property of the void hierarchy. We found that the distribution of void sizes scaled with the mean galaxy separation, λ . In particular, we found that the size of voids covering half of the area is given by D _med≈ λ +(12±3)  h ⁻¹ Mpc. Next, by employing an environmental density threshold criterion to identify mock galaxies, we were able to extend this analysis to mock samples from dynamical N -body simulations of cold dark matter (CDM) models. To reproduce the observed void statistics, overdensity thresholds of δ _th≈0,…,1 are necessary. We compared standard (SCDM), open (OCDM), vacuum energy dominated (ΛCDM) and broken scale invariant CDM models (BCDM): we found that both the void size distribution and the two-point correlation function provided important and complementary information on the large-scale matter distribution. The dependence of the void statistics on the threshold criterion for the mock galaxy identification showed that the galaxy biasing was more crucial for the void size distribution than were differences between the cosmological models.  相似文献   

Earthquake risk management pilot project in Quito, Ecuador   总被引：1，自引：0，他引：1  

J.-L. Chatelain  B. Tucker  B. Guillier  F. Kaneko  H. Yepes  J. Fernandez  J. Valverde  G. Hoefer  M. Souris  E. Dupérier  T. Yamada  G. Bustamante  C. Villacis 《GeoJournal》1999,49(2):185-196

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Temperature effects on the 15–85 μm spectra of olivines and pyroxenes     

J.E. Bowey  C. Lee  C. Tucker  A.M. Hofmeister  P.A.R. Ade  M.J. Barlow 《Monthly notices of the Royal Astronomical Society》2001,325(2):886-896

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ELECTROLYTIC CORROSION OF IRON METEORITES     

Stanford L. Tackett  Ray A. Tucker  Floyd R. Duncan 《Meteoritics & planetary science》1970,5(1):43-55

Six iron meteorites were electrolyzed and the resulting corrosion was studied by a potentiostatic technique. It was found that both iron and nickel in the kamacite phase dissolve, and that neither iron nor nickel dissolve from taenite. The rate of corrosion was shown to be inversely proportional to the nickel content. However, structure, as well as nickel content, plays an important part in the electrolytic process. The Coya Norte, Chile meteorite dissolved more rapidly and more easily (at a lower potential) than did pure iron even though the Coya Norte meteorite contains 5.5% nickel.  相似文献