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12 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaHo(Pd3O4)2 by Materials Project

NaHo(Pd3O4)2 crystallizes in the cubic Pm-3 space group. The structure is three-dimensional. Na1+ is bonded in a body-centered cubic geometry to eight O2- atoms. All Na–O bond lengths are 2.63 Å. Ho3+ is bonded in a body-centered cubic geometry to eight O2- atoms. All Ho–O bond lengths are 2.42 Å. Pd2+ is bonded in a square co-planar geometry to four O2- atoms. All Pd–O bond lengths are 2.06 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one Na1+, one Ho3+, and three equivalent Pd2+ atoms to form a mixture of edge and corner-sharing ONaHoPd3 trigonal bipyramids. In the second O2- site, O2- is bonded to one Na1+, one Ho3+, and three equivalent Pd2+ atoms to form a mixture of edge and corner-sharing ONaHoPd3 trigonal bipyramids. All O–Pd bond lengths are 2.06 Å. In the third O2- site, O2- is bonded to one Na1+, one Ho3+, and three equivalent Pd2+ atoms to form a mixture of edge and corner-sharing ONaHoPd3 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two NaOH sheets oriented in the (0, 1, 0) direction. Na1+ is bonded to five equivalent O2- atoms to form a mixture of edge and corner-sharing NaO5 square pyramids. There are one shorter (2.33 Å) and four longer (2.44 Å) Na–O bond lengths. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. O2- is bonded in a distorted single-bond geometry to five equivalent Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one NaOH sheet oriented in the (0, 0, 1) direction. Na1+ is bonded to five equivalent O2- atoms to form a mixture of distorted edge and corner-sharing NaO5 square pyramids. There are a spread of Na–O bond distances ranging from 2.34–2.47 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. O2- is bonded in a distorted single-bond geometry to five equivalent Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the trigonal R3m space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to three equivalent H1+ and three equivalent O2- atoms. All Na–H bond lengths are 2.26 Å. All Na–O bond lengths are 2.44 Å. H1+ is bonded in a single-bond geometry to three equivalent Na1+ and one O2- atom. The H–O bond length is 0.97 Å. O2- is bonded in a single-bond geometry to three equivalent Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the monoclinic Pm space group. The structure is two-dimensional and consists of one NaOH sheet oriented in the (0, 0, 1) direction. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 5-coordinate geometry to two equivalent H1+ and three O2- atoms. Both Na–H bond lengths are 2.25 Å. All Na–O bond lengths are 2.33 Å. In the second Na1+ site, Na1+ is bonded in a 5-coordinate geometry to one H1+ and four equivalent O2- atoms. The Na–H bond length is 2.25 Å. There are two shorter (2.46 Å) and two longer (2.51 Å) Na–O bond lengths. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to three Na1+ and one O2- atom. The H–O bond length is 0.97 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to five Na1+ and one H1+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the monoclinic P2_1 space group. The structure is two-dimensional and consists of one NaOH sheet oriented in the (0, 0, 1) direction. Na1+ is bonded in a 5-coordinate geometry to two equivalent H1+ and five equivalent O2- atoms. There are one shorter (2.57 Å) and one longer (2.63 Å) Na–H bond lengths. There are a spread of Na–O bond distances ranging from 2.33–2.54 Å. H1+ is bonded in a single-bond geometry to two equivalent Na1+ and one O2- atom. The H–O bond length is 0.98 Å. O2- is bonded in a distorted single-bond geometry to five equivalent Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the monoclinic Cm space group. The structure is two-dimensional and consists of two NaOH sheets oriented in the (1, 0, 0) direction. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to three H1+ and five O2- atoms. There are one shorter (2.26 Å) and two longer (2.49 Å) Na–H bond lengths. There are a spread of Na–O bond distances ranging from 2.46–2.58 Å. In the second Na1+ site, Na1+ is bonded in a 5-coordinate geometry to two equivalent H1+ and three O2- atoms. Both Na–H bond lengths are 2.19 Å. There are two shorter (2.29 Å) and one longer (2.43 Å) Na–O bond lengths. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to three Na1+ and one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to two equivalent Na1+ and one O2- atom. The H–O bond length is 0.98 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Na1+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to five Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHO by Materials Project

NaOH crystallizes in the triclinic P1 space group. The structure is one-dimensional and consists of two NaOH ribbons oriented in the (0, 0, 1) direction. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both Na–O bond lengths are 2.39 Å. In the second Na1+ site, Na1+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. There are one shorter (2.38 Å) and one longer (2.39 Å) Na–O bond lengths. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. O2- is bonded in a single-bond geometry to two Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

The safety of pranlukast and montelukast during the first trimester of pregnancy: A prospective, two‐centered cohort study in Japan

Abstract For leukotriene receptor antagonists (LTRAs), especially pranlukast, safety data during pregnancy is limited. Therefore, we conducted a prospective, two‐centered cohort study using data from teratogen information services in Japan to clarify the effects of LTRA exposure during pregnancy on maternal and fetal outcomes. Pregnant women who being counseled on drug use during pregnancy at two facilities were enrolled. The primary outcome of this study was major congenital anomalies. The incidence of major congenital anomalies in women exposed to montelukast or pranlukast during the first trimester of pregnancy was compared with that of controls. Logistic regression analysis was performed to analyze the effects of maternal LTRA use during the first trimester of pregnancy on major congenital anomalies. The outcomes of 231 pregnant women exposed to LTRAs (montelukast n = 122; pranlukast n = 106; both n = 3) and 212 live births were compared with those of controls. The rate of major congenital anomalies in the LTRA group was 1.9%. Multivariable logistic regression analysis revealed that LTRA exposure was not a risk factor for major congenital anomalies (adjusted odds ratio, 0.78; 95% confidence interval, 0.23–2.05; p = 0.653). In addition, no significant difference was detected in stillbirth, spontaneous abortion, preterm birth, and low birth weight between the two groups. The present study revealed that montelukast and pranlukast were not associated with the risk of major congenital anomalies. Our findings suggest that LTRAs could be safely employed for asthma therapy during pregnancy.

Hatakeyama, Shiro↗
DOE OSTI2021

Two Bright M Dwarfs Hosting Ultra-Short-Period Super-Earths with Earth-like Compositions

We present observations of two bright M dwarfs (TOI-1634 and TOI-1685: J = 9.5–9.6) hosting ultra-short-period (USP) planets identified by the TESS mission. The two stars are similar in temperature, mass, and radius (T {sub eff} ≈ 3500 K, M {sub &middot;} ≈ 0.45–0.46 M {sub ⊙}, and R {sub &middot;} ≈ 0.45–0.46 R {sub ⊙}), and the planets are both super-Earth size (1.25 R {sub ⊕} < R {sub p} < 2.0 R {sub ⊕}). For both systems, light curves from ground-based photometry exhibit planetary transits, whose depths are consistent with those from the TESS photometry. We also refine the transit ephemerides based on the ground-based photometry, finding the orbital periods of P = 0.9893436 ± 0.0000020 days and P = 0.6691416 ± 0.0000019 days for TOI-1634b and TOI-1685b, respectively. Through intensive radial velocity (RV) observations using the InfraRed Doppler (IRD) instrument on the Subaru 8.2 m telescope, we confirm the planetary nature of the TOIs and measure their masses: 10.14 ± 0.95 M {sub ⊕} and 3.43 ± 0.93 M {sub ⊕} for TOI-1634b and TOI-1685b, respectively, when the observed RVs are fitted with a single-planet circular-orbit model. Combining those with the planet radii of R {sub p} = 1.749 ± 0.079 R {sub ⊕} (TOI-1634b) and 1.459 ± 0.065 R {sub ⊕} (TOI-1685b), we find that both USP planets have mean densities consistent with an Earth-like internal composition, which is typical for small USP planets. TOI-1634b is currently the most massive USP planet in this category, and it resides near the radius valley, which makes it a benchmark planet in the context of discussing the size limit of rocky planet cores as well as testing the formation scenarios for USP planets. Excess scatter in the RV residuals for TOI-1685 suggests the presence of a possible secondary planet or unknown activity/instrumental noise in the RV data, but further observations are required to check those possibilities.

47 OTHER INSTRUMENTATION↗
NASA NTRS2021

Two Bright M Dwarfs Hosting Ultra-Short-Period Super-Earths with Earth-like Compositions

We present observations of two bright M dwarfs (TOI-1634 and TOI-1685: J = 9.5–9.6) hosting ultra-short-period (USP) planets identified by the TESS mission. The two stars are similar in temperature, mass, and radius (T eff ≈ 3500 K, M ⋆ ≈ 0.45–0.46 M ⊙ , and R ⋆ ≈ 0.45–0.46 R ⊙ ), and the planets are both super-Earth size (1.25 R ⊕ < R p < 2.0 R ⊕ ). For both systems, light curves from ground-based photometry exhibit planetary transits, whose depths are consistent with those from the TESS photometry. We also refine the transit ephemerides based on the ground-based photometry, finding the orbital periods of P = 0.9893436 ± 0.0000020 days and P = 0.6691416 ± 0.0000019 days for TOI-1634b and TOI-1685b, respectively. Through intensive radial velocity (RV) observations using the InfraRed Doppler (IRD) instrument on the Subaru 8.2 m telescope, we confirm the planetary nature of the TOIs and measure their masses: 10.14 ± 0.95 M ⊕ and 3.43 ± 0.93 M ⊕ for TOI-1634b and TOI-1685b, respectively, when the observed RVs are fitted with a single-planet circular-orbit model. Combining those with the planet radii of R p = 1.749 ± 0.079 R ⊕ (TOI-1634b) and 1.459 ± 0.065 R ⊕ (TOI-1685b), we find that both USP planets have mean densities consistent with an Earth-like internal composition, which is typical for small USP planets. TOI-1634b is currently the most massive USP planet in this category, and it resides near the radius valley, which makes it a benchmark planet in the context of discussing the size limit of rocky planet cores as well as testing the formation scenarios for USP planets. Excess scatter in the RV residuals for TOI-1685 suggests the presence of a possible secondary planet or unknown activity/instrumental noise in the RV data, but further observations are required to check those possibilities.

Teruyuki Hirano↗