182 research outputs found
MOA-2011-BLG-262Lb : a sub-earth-mass moon orbiting a gas giant primary or a high velocity planetary system in the galactic bulge
No full textD.P.B. was supported by grants NASA-NNX12AF54G, JPL-RSA 1453175 and NSF AST-1211875. This MOA project is supported by the grants JSPS18253002 and JSPS20340052. T.S. acknowledges the financial support from the JSPS, JSPS23340044, JSPS24253004. This work was partially supported by a NASA Keck PI Data Award, administered by the NASA Exoplanet Science Institute. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. B.S.G. and A.G. were supported by NSF grant AST 110347. B.S.G., A.G., R.P.G. were supported by NASA grant NNX12AB99G. S.D. was partly supported through a Ralph E. and Doris M. Hansmann Membership at the IAS and by NSF grant AST-0807444. Work by J.C.Y. was performed in part under contract with the California Institute of Technology (Caltech) funded by NASA through the Sagan Fellowship Program. The OGLE project has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement No. 246678 to A.U. D.H. was supported by Czech Science Foundation grant GACR P209/10/1318. D.M.B., M.D., K.H., C.S., R.A.S., M.H. and Y.T. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of the Qatar Foundation).We present the first microlensing candidate for a free-floating exoplanet-exomoon system, MOA-2011-BLG-262, with a primary lens mass of M host ~ 4 Jupiter masses hosting a sub-Earth mass moon. The argument for an exomoon hinges on the system being relatively close to the Sun. The data constrain the product MLπrel where ML is the lens system mass and πrel is the lens-source relative parallax. If the lens system is nearby (large πrel), then ML is small (a few Jupiter masses) and the companion is a sub-Earth-mass exomoon. The best-fit solution has a large lens-source relative proper motion, μrel = 19.6 ± 1.6 mas yr–1, which would rule out a distant lens system unless the source star has an unusually high proper motion. However, data from the OGLE collaboration nearly rule out a high source proper motion, so the exoplanet+exomoon model is the favored interpretation for the best fit model. However, there is an alternate solution that has a lower proper motion and fits the data almost as well. This solution is compatible with a distant (so stellar) host. A Bayesian analysis does not favor the exoplanet+exomoon interpretation, so Occam's razor favors a lens system in the bulge with host and companion masses of M host = 0.12 +0.19-0.06 MΘ and mcomp = 18+28-10M⊕, at a projected separation of a⊥ = 0.84+0.25−0.14 AU. The existence of this degeneracy is an unlucky accident, so current microlensing experiments are in principle sensitive to exomoons. In some circumstances, it will be possible to definitively establish the mass of such lens systems through the microlensing parallax effect. Future experiments will be sensitive to less extreme exomoons.Peer reviewe
Author Correction: Rapid increase in the risk of heat-related mortality.
No full textCorrection to: Nature Communicationshttps://doi.org/10.1038/s41467-023-40599-x, published online 24 August 2023 The original version of this Article omitted from the author list the 17th author, “Multi-Country Multi-City (MCC) collaborative research network”, which is the consortium providing the mortality data. A list of consortium authors and their affiliations are provided in the HTML version of this Correction. Part of the Author Contributions statement was incorrectly given and should have read ‘A.M.V.C., E.M.F., B.A., M.D.S.Z.S.C., Y.L.G., Y.G., Y.H., V.H., J.K., E.L., D.R., N.R., N.S., S.S., A.U., A.G. and the MCC were involved in resources and data curation.’ In addition, the primary affiliation ‘Climate Research Foundation (FIC), Madrid, Spain’ for Dominic Roye was missing
Properties of Th4+ and Th3+ from rf spectroscopy of high-L thorium Rydberg ions
No full text2013 Summer.Includes bibliographical references.Several properties of radon-like Th4+ and francium-like Th3+ were determined from measurements of high-L Rydberg fine structure in Th3+ and Th2+ ions. The measurements were carried out using the resonant excitation Stark ionization spectroscopy (RESIS) technique to detect rf transitions between levels in the same n. The measured Rydberg fine structures were then fit to an effective potential model, and the properties of the ions were extracted. Properties of the 1S0 ground state of Th4+ extracted from the measurements of the n=37 Th3+ Rydberg fine structure were the scalar dipole polarizability, αD,0=7.702(6)a.u. and the scalar quadrupole polarizability, αQ,0=29.1(1.6)a.u.. The Th2+ Rydberg fine structure is much more complex since the ground state of Th3+ is a 2F5/2, and the presence of low-lying excited states cause non-adiabatic effects in the fine structure which are not well described by the effective potential. To extract the properties, non-adiabatic corrections had to be calculated. The properties of Th3+ extracted were the permanent quadrupole moment, Q=0.5931(14)a.u., the scalar and tensor dipole polarizabilities, αD,0=15.224(33)a.u. and αD,2=-5.30(11)a.u., the permanent hexadecapole moment, Π=-0.69(28)a.u., and the reduced dipole and octupole matrix elements coupling the ground state to the 6d 2D3/2 state, ||=1.436(2)a.u. and ||=3.3(1.1)a.u.
Van Leegstand tot Leefbaar: Het organiseren van het proces van de transformatie van leegstaand vastgoed naar tijdelijke studentenhuisvesting
No full textIn de toekomst zal de vraag naar nieuwbouw afnemen en zal er juist steeds meer van de bestaande voorraad getransformeerd dienen te worden. Bovendien zullen veel bestaande gebieden geherstructu-reerd worden om deze gebieden leefbaarder te maken. Hierbij kan tijdelijke transformatie een grote rol spelen. Vaak duurt het erg lang voordat - na het initiatief om een gebied te transformeren – het gebied daadwerkelijk wordt getransformeerd. Als er in de tussentijd niets met de gebouwen in dit gebied gebeurt blijven gebouwen leegstaan en blijft het gebied onleefbaar. Hier ligt een grote kans om twee problemen; het tekort aan studentenkamers en deze tijdelijke leegstand, op te lossen. Stichting Herontwikkeling tot Studentenhuisvesting Delft (SHS Delft) heeft deze kans gezien en wil deze problemen oplossen. SHS Delft is een stichting die bestaat uit studenten van de Technische Uni-versiteit Delft. SHS Delft wil graag panden transformeren naar tijdelijke woonruimte voor studenten en deze panden vervolgens zelf beheren. In Utrecht is eerder een dergelijke stichting opgericht (Stichting Tijdelijk Wonen Utrecht) die al enkele panden tijdelijk heeft getransformeerd naar studentenhuisves-ting. Toch is het voor zulke beginnende stichtingen als SHS Delft lastig om duidelijk te krijgen wat ze moeten doen en vooral hoe ze dat moeten doen. Het kost voor de stichting erg veel tijd om er achter te komen hoe ze het aan moeten pakken. Daarnaast zullen ze veel van wat STW ook al heeft uitge-zocht opnieuw moeten uitzoeken, omdat er nog geen duidelijke informatie op papier is verzameld. Vandaar dat SHS Delft naar de TU Delft toe is gestapt met de vraag hoe ze het aan moeten pakken, waar ze moeten beginnen en hoe ze problemen waar ze tegenaan lopen het beste op kunnen lossen. Op dit moment is er duidelijk een gebrek aan kennis op het gebied van het gehele proces (vanaf het initiatief tot en met beheer) van tijdelijke transformatie van leegstaand vastgoed naar studentenhuis-vesting. Groepen die zich bezighouden met studentenhuisvesting gaan los van elkaar aan de slag en moeten steeds opnieuw het wiel uitvinden. Daarom wordt in dit onderzoek de vraag gesteld: Hoe kan het proces van de transformatie van leegstaand vastgoed naar tijdelijke studenten-huisvesting in Nederland worden georganiseerd van de initiatieffase tot en met de beheersfase? Het doel van dit onderzoek is tweeledig: het richt zich enerzijds op uitbreiding van de kennis over tij-delijke transformatie en richt zich anderzijds op het ontwikkelen van een handleiding voor de trans-formatie van leegstaand vastgoed naar studentenhuisvesting. Deze handleiding kunnen studenten huisvestingsstichtingen en andere ontwikkelaars van studentenhuisvesting gebruiken wanneer ze leeg-staande panden willen transformeren naar tijdelijke studentenhuisvesting.Design and Construction ManagementReal Estate & HousingArchitectur
Engineering of cartilage tissue constructs in a 3-dimensional perfusion bioreactor culture system under controlled oxygen tension
No full textThe most relevant results generated in this thesis can be summarized as follow:
· Adult human articular chondrocytes (AHAC) from elderly individuals expanded in culture
medium supplemented with the growth factors TGFβ-1, FGF-2 and PDGF and subsequently
cultured in 3-d pellets had an enhanced chondrogenic capacity when exposed to more
physiological (i.e. 5%) oxygen levels.
· In correlation with the enhanced tissue forming capacity of AHAC from elderly donors under
low oxygen tension, the mRNA expression levels of selective matrix degrading enzymes
were reduced as compared to conventional in vitro oxygen culture condition.
· We developed an integrated bioreactor system, which streamlines within a single device the
phases of perfusion cell seeding and prolonged perfusion culture of cell seeded scaffolds in
vitro.
· The culturing of uniformly seeded adult human articular chondrocytes under direct perfusion,
where cells are continuously exposed to a normoxic range of oxygen levels, can maintain a
uniform distribution of viable cells throughout thick porous scaffolds as compared to
statically cultured constructs.
· The culturing of constructs uniformly seeded with adult human articular chondrocytes under
a more physiological range of oxygen resulted in a higher chondrogenic differentiation as
compared to culture under normoxic levels. Anyhow, this effect was less pronounced as
compared to statically cultured cell constructs or micromass cell pellets, possibly due to the
flow induced shear forces.
· Reduced perfusion flow rates applied to chondrocytes on porous scaffolds significantly
induced more cartilaginous tissue in the presents of low vs. high oxygen levels. However the
effects of low oxygen were not as marked as in pellet culture
Van leegstand naar leefbaar: De tijdelijke transformatie van leegstaande gebouwen
No full textReal Estate & HousingArchitectur
Пара матриць Якобі та дуальні альтернативні q-многочлени Шарльє
No full textBy using two operators representable by Jacobi matrices, we introduce a family of q-orthogonal polynomials, which turn out to be dual with respect to alternative q-Charlier polynomials. A discrete orthogonality relation and the completeness property for these polynomials are established.3a допомогою двох операторів, зображуваних матрицями Якобі, введено сім'ю q-ортогональних многочленів, що є дуальними по відношенню до альтернативних q-многочленів Шарльє. Для цих многочленів отримано дискретне співвідношення ортогональності та властивість повноти.This work was performed during a visit of the second author (AUK) to the Institute of Mathematics,
UNAM, Mexico. The participation of the first author (NMA) has been supported in part by the
DGAPA-UNAM project IN102603-3 “Óptica Matemática”
APPLICATION OF ENZYME-LINKED IMMUNOSORBENT ASSAY FOR AFLATOXIN CONTENT EVALUATION OF DIFFERENT POWDERED MILK AVALABLE IN ANAMBRA STATE, NIGERIA
No full textThe application of enzyme-link immunosorbent assay for aflatoxin contamination of 20 different powdered milk samples consumed within Anambra State, Nigeria was carried out primarily to ascertain their health implications. The samples were subjected to Ridascreen ELISA competitive enzyme immunoassay for the quantitative determination of aflatoxins in the milk. All the reagents required for the enzyme immunoassay including statndards were contained in the test kit used. Preparatory samples stages were grinding, extraction, filtration/centrifugation followed by acid mixture digestion process with tablet of selenium catalyst. The proximate analyses of the samples were done via AOAC standard procedures. The results revealed relatively low moisture contents with a range of 1.64 to 4.72%, with sample T recording highest value of 4.72% . The highest value of ash content was observed for sample D ( 6.57%) while sample R had lowest value of 0.85%. The lowest amount of crude fat was recorded by sample F (2.60%) as against high value of 21.33% for sample B. Crude protein showed least amount in samples A (20.19%) with the highest amount found in sample H (23.67%). The quantification of aflatoxins in the 20 powdered milk samples using ELIZA method revealed relatively low concentration of aflatoxins in the samples and the trend observed had a range of 0.36ppm (sample B) to 0.81ppm (sample F). The average aflatoxin concentration was estimated to be 0.61ppm. Samples C, E and F had mean level of aflatoxin recorded as 0.71ppm while the mean amount implicated for samples A, B, G and K was 0.51ppm. Conclusively, the results of the proximate analysis of the milk samples revealed appreciable occurrence of crude protein and relatively low amount of aflatoxins. The level of aflatoxins in all the samples was found to occur below National Regulatory threshold value of 4ppm, hence all the samples analyzed can be adjudged to be safe for consumption with little precautionary measures for hygiene and preservation
Пара матриць Якобі та дуальні альтернативні q-многочлени Шарльє
No full textBy using two operators representable by Jacobi matrices, we introduce a family of q-orthogonal polynomials, which turn out to be dual with respect to alternative q-Charlier polynomials. A discrete orthogonality relation and the completeness property for these polynomials are established.3a допомогою двох операторів, зображуваних матрицями Якобі, введено сім'ю q-ортогональних многочленів, що є дуальними по відношенню до альтернативних q-многочленів Шарльє. Для цих многочленів отримано дискретне співвідношення ортогональності та властивість повноти.This work was performed during a visit of the second author (AUK) to the Institute of Mathematics,
UNAM, Mexico. The participation of the first author (NMA) has been supported in part by the
DGAPA-UNAM project IN102603-3 “Óptica Matemática”
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