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- Morales, J. C., et al.
(författare)
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A giant exoplanet orbiting a very-low-mass star challenges planet formation models
- 2019
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 365:6460, s. 1441-1445
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Tidskriftsartikel (refereegranskat)abstract
- Surveys have shown that super-Earth and Neptune-mass exoplanets are more frequent than gas giants around low-mass stars, as predicted by the core accretion theory of planet formation. We report the discovery of a giant planet around the very-low-mass star GJ 3512, as determined by optical and near-infrared radial-velocity observations. The planet has a minimum mass of 0.46 Jupiter masses, very high for such a small host star, and an eccentric 204-day orbit. Dynamical models show that the high eccentricity is most likely due to planet-planet interactions. We use simulations to demonstrate that the GJ 3512 planetary system challenges generally accepted formation theories, and that it puts constraints on the planet accretion and migration rates. Disk instabilities may be more efficient in forming planets than previously thought.
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- Waldman, Meryl, et al.
(författare)
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COVID-19 in Patients with Glomerular Disease: Follow-Up Results from the IRoc-GN International Registry
- 2022
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Ingår i: KIDNEY360. - : AMER SOC NEPHROLOGY. - 2641-7650. ; 3:2, s. 293-306
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Tidskriftsartikel (refereegranskat)abstract
- Background The acute and long-term effects of severe acute respiratory syndrome coronavirus 2 infection in individuals with GN are still unclear. To address this relevant issue, we created the International Registry of COVID-19 infection in GN.Methods We collected serial information on kidney-related and-unrelated outcomes from 125 GN patients (63 hospitalized and 62 outpatients) and 83 non-GN hospitalized patients with coronavirus disease 2019 (COVID-19) and a median follow-up period of 6.4 (interquartile range 2.3-9.6) months after diagnosis. We used logistic regression for the analyses of clinical outcomes and linear mixed models for the longitudinal analyses of eGFR. All multiple regression models were adjusted for age, sex, ethnicity, and renin-angiotensin-aldosterone system inhibitor use.Results After adjustment for pre-COVID-19 eGFR and other confounders, mortality and AKI did not differ between GN patients and controls (adjusted odds ratio for AKI=1.28; 95% confidence interval [CI], 0.46 to 3.60; P=0.64). The main predictor of AKI was pre-COVID-19 eGFR (adjusted odds ratio per 1 SD unit decrease in eGFR=3.04; 95% CI, 1.76 to 5.28; P,0.001). GN patients developing AKI were less likely to recover pre-COVID19 eGFR compared with controls (adjusted 6-month post-COVID-19 eGFR=0.41; 95% CI, 0.25 to 0.56; times preCOVID-19 eGFR). Shorter duration of GN diagnosis, higher pre-COVID-19 proteinuria, and diagnosis of focal segmental glomerulosclerosis or minimal change disease were associated with a lower post-COVID-19 eGFR.Conclusions Pre-COVID-19 eGFR is the main risk factor for AKI regardless of GN diagnosis. However, GN patients are at higher risk of impaired eGFR recovery after COVID-19-associated AKI. These patients (especially those with high baseline proteinuria or a diagnosis of focal segmental glomerulosclerosis or minimal change disease) should be closely monitored not only during the acute phases of COVID-19 but also after its resolution.
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- Asekritova, Irina, et al.
(författare)
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Rearrangement estimates for A(infinity) weights
- 2019
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Ingår i: Revista Matemática Complutense. - : SPRINGER-VERLAG ITALIA SRL. - 1139-1138 .- 1988-2807. ; 32:3, s. 731-743
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Tidskriftsartikel (refereegranskat)abstract
- We find a new characterizations of an A(infinity) weight omega, in terms of the decreasing rearrangement of the restriction of omega to cubes Q.
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- Carro, María J., et al.
(författare)
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On restriction of maximal multipliers in weighted settings
- 2012
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Ingår i: Transactions of the American Mathematical Society. - 0002-9947 .- 1088-6850. ; 364:5, s. 2241-2260
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Tidskriftsartikel (refereegranskat)abstract
- We obtain restriction results of K. De Leeuw's type for maximal operators defined through Fourier multipliers of either strong or weak type for weighted L-p spaces with 1 <= p <= infinity. Applications to the case of Hormander-Mihlin multipliers, singular integral operators and Bochner-Riesz sums are given.
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| 11. |
- Carro, Maria J., et al.
(författare)
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Real interpolation for divisible cones
- 1999
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Ingår i: Proceedings of the Edinburgh Mathematical Society. - 0013-0915 .- 1464-3839. ; 42:2, s. 285-304
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Tidskriftsartikel (refereegranskat)abstract
- We give necessary and sufficient conditions on a general cone of positive functions to satisfy the Decomposition Property (DP) introduced in [5] and connect the results with the theory of interpolation of cones introduced by Sagher [9]. One of our main result states that if Q satisfies DP or equivalently is divisible, then for the quasi-normed spaces E0 and E1, According to this formula, it yields that the interpolation theory for divisible cones can be easily obtained from the classical theory
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| 12. |
- Carro, Maria J., et al.
(författare)
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S-divisibility property and a Holmstedt type formula
- 1999
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Ingår i: Journal of Approximation Theory. - : Elsevier BV. - 0021-9045 .- 1096-0430. ; 98:1, s. 1-24
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Tidskriftsartikel (refereegranskat)abstract
- Given a conePof positive functions and an operatorS: →Pwith an additive group, we extend the concept ofK-divisibility to get some new formulas for theK-functional of finite families of lattices. Applications are given in the setting of rearrangement invariant spaces and weighted Lorentz spaces. As a consequence of our results, we also obtain a generalized Holmstedt formula due to Asekritova
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- Carro, Maria J., et al.
(författare)
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Some real interpolation methods for families of Banach spaces : a comparison
- 1997
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Ingår i: Journal of Approximation Theory. - : Elsevier BV. - 0021-9045 .- 1096-0430. ; 89:1, s. 26-57
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Tidskriftsartikel (refereegranskat)abstract
- We consider certain real interpolation methods for families of Banach spaces. We also define some new such methods obtained by passing to the limit in the constructions of Sparr and Cobos-Peetre. The relations between all these methods are studied. Characterizations of minimal and maximal spaces are obtained. Some concrete examples as well as sharp estimates of the corresponding operator norms are also exhibited.
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- Sanchez Perez, Cesar, 1981, et al.
(författare)
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Design and applications of a 300-800 MHz tunable matching network
- 2013
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Ingår i: IEEE Journal on Emerging and Selected Topics in Circuits and Systems. - 2156-3365 .- 2156-3357. ; 3:4, s. 531-540
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the optimized design, characterization and applications of a broadband 300-800 MHz ($\sim$ 91% fractional bandwidth) digitally-controlled tunable matching network is presented. The design employs PIN diodes as switching components and a repetitive structure of basic cells using lumped reactive elements. After an intensive and complex optimization process, a Smith chart coverage (return losses better than 10 dB and losses lower than 2 dB) above 60% is obtained in all the bandwidth reaching 75% in the middle of the band (400-700 MHz). The potential of the manufactured tunable matching network for antenna mismatch compensation, antenna bandwidth extension and power amplifier efficiency improvement in back-off is showed. © 2011 IEEE.
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