Search NASA⌕ Search

SEARCH · Search NASA

Results for “CC&C”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 145 records · Page 8
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

photoD with Rubin ’s Data Preview 1: First stellar photometric distances and faint blue star deficits

Aims. We investigate the utility of Rubin’s Data Preview 1 (DP1) for estimating stellar number density profiles across the Milky Way halo. Methods. We used stellar broad-band near-UV to near-IR ugrizy photometry released in Rubin’s DP1 to estimate distance and metallicity for blue main sequence stars brighter than r = 24 in three ~1.1 sq. deg. fields at southern Galactic latitudes. Results. Compared to TRILEGAL simulations of the Galaxy’s stellar content, we found a likely deficit of blue main sequence turn-off stars with 22 < r < 24. We interpreted this discrepancy as a signature of a steeper halo number density profile at galactocentric distances 10–50 kpc than the canonical ~1/r 3 profile assumed in TRILEGAL simulations. Conclusions. This interpretation is consistent with earlier suggestions based on observations of more luminous, but much less numerous, evolved stellar populations, along with a few pencil beam surveys of blue main sequence stars in the northern sky. These results bode well for the future Galactic halo exploration with Rubin’s Legacy Survey of Space and Time (LSST).

Galaxy: fundamental parameters↗
DOE OSTI2022

PIO Tools

This is a set of utilities for reading and manipulating PIO files written in python and C++. These files are intended to be building blocks for other scripts / programs that will use them to do great things. The PIO format itself is described in LA-UR-05-7425 at page 102 and embodied in code LA-CC-05-052. In addition to reading the raw PIO files, the bundled utilities will expand variable that use a compressed sparse row notation

Swaminarayan, Sriram↗
DOE OSTI2020

Materials Data on SbH3C2(O2F3)2 by Materials Project

CHO2CSbH2(OF3)2 crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four formic acid molecules and four CSbH2(OF3)2 clusters. In each CSbH2(OF3)2 cluster, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.28 Å. Sb3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Sb–F bond distances ranging from 1.90–1.95 Å. 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 1.01 Å. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.02 Å. The H–F bond length is 1.59 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one C4+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one C4+ and one H1+ atom. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sb3+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Sb3+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one Sb3+ atom. In the fourth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Sb3+ and one H1+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Sb3+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one Sb3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As2H2CCl4 by Materials Project

CAs2H2Cl4 crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of twelve methylenebis(dichloroarsine) molecules. C2+ is bonded in a distorted tetrahedral geometry to two As and two H1+ atoms. There is one shorter (1.99 Å) and one longer (2.00 Å) C–As bond length. Both C–H bond lengths are 1.10 Å. There are two inequivalent As sites. In the first As site, As is bonded in a 3-coordinate geometry to one C2+ and two Cl1- atoms. There are one shorter (2.22 Å) and one longer (2.25 Å) As–Cl bond lengths. In the second As site, As is bonded in a 3-coordinate geometry to one C2+ and two Cl1- atoms. There are one shorter (2.22 Å) and one longer (2.24 Å) As–Cl bond lengths. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. There are four inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one As atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one As atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one As atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one As atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H14C3NCl5 by Materials Project

(C3H7NH3)2(HCl)8Cl2 is Silicon tetrafluoride-derived structured and crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four hydrochloric acid molecules, sixteen hydrochloric acid molecules, and four trimethylazanium molecules.

36 MATERIALS SCIENCE↗
NASA NTRS1983

An experimental study of adsorption interference in binary mixtures flowing through activated carbon

The isothermal transmission through activated carbon adsorber beds at 25 C of acetaldehyde-propane and acetylene-ethane mixtures in a helium carrier gas was measured. The inlet concentration of each component was in the range between 10 ppm and 500 ppm. The constant inlet volumetric flow rate was controlled at 200 cc (STP)/min in the acetaldehyde-propane experiments and at 50 cc (STP)/min in the acetaldehyde-ethane experiments. Comparison of experimental results with the corresponding single-component experiments under similar conditions reveals interference phenomena between the components of the mixtures as evidenced by changes in both the adsorption capacity and the dispersion number. Propane was found to displace acetaldehyde from the adsorbed state. The outlet concentration profiles of propane in the binary mixtures tend to become more diffuse than the corresponding concentration profiles of the one-component experiments. Similar features were observed with mixtures of acetylene and ethane; however, the displacement of acetylene by ethane is less pronounced.

Madey, R.↗
NASA NTRS2006

Computational Analysis of Dual Radius Circulation Control Airfoils

The goal of the work is to use multiple codes and multiple configurations to provide an assessment of the capability of RANS solvers to predict circulation control dual radius airfoil performance and also to identify key issues associated with the computational predictions of these configurations that can result in discrepancies in the predicted solutions. Solutions were obtained for the Georgia Tech Research Institute (GTRI) dual radius circulation control airfoil and the General Aviation Circulation Control (GACC) dual radius airfoil. For the GTRI-DR airfoil, two-dimensional structured and unstructured grid computations predicted the experimental trend in sectional lift variation with blowing coefficient very well. Good code to code comparisons between the chordwise surface pressure coefficients and the solution streamtraces also indicated that the detailed flow characteristics were matched between the computations. For the GACC-DR airfoil, two-dimensional structured and unstructured grid computations predicted the sectional lift and chordwise pressure distributions accurately at the no blowing condition. However at a moderate blowing coefficient, although the code to code variation was small, the differences between the computations and experiment were significant. Computations were made to investigate the sensitivity of the sectional lift and pressure distributions to some of the experimental and computational parameters, but none of these could entirely account for the differences in the experimental and computational results. Thus, CFD may indeed be adequate as a prediction tool for dual radius CC flows, but limited and difficult to obtain two-dimensional experimental data prevents a confident assessment at this time.

Lee-Rausch, E. M.↗
NASA NTRS2017

A Case for Nebula Scale Mixing Between Non-Carbonaceous and Carbonaceous Chondrite Reservoirs: Testing the Grand Tack Model with Chromium Isotopic Composition of Almahata Sitta Stone 91A

There is an increasing number of Cr-O-Ti isotope studies that show solar system materials are divided into two main populations, one carbonaceous chondrite (CC)-like and the other is non-carbonaceous (NC)-like, with minimal mixing attributed to a gap opened in the protoplanetary disk due to Jupiter's formation. The Grand Tack model suggests there should be large-scale mixing between S- and C-type asteroids, an idea supported by our recent work on chondrule (Delta)17O-ε54Cr isotope systematics. The Almahata Sitta (AhS) meteorite provides a unique opportunity to test the Grand Tack model. The meteorite fell to Earth in October 2008 and has been linked to the asteroid 2008 TC3 which was discovered just prior to the fall of the AhS stones. The AhS meteorite is composed of up to 700 individual pieces with approx.140 of those pieces having some geochemical and/or petrologic studies. Almahata Sitta is an anomalous polymict ureilite with other meteorite components, including enstatite, ordinary, and carbonaceous chondrites with an approximate abundance of 70% ureilites and 30% chondrites. This observation has lead to the suggestion that TC3 2008 was a loosely aggregated rubble pile-like asteroid with the non-ureilite sample clasts within the rubble-pile. Due to the loosely-aggregated nature of AhS, the object disintegrated during atmospheric entry resulting in the weakly held clasts falling predominantly as individual stones in the AhS collection area. However, recent work has identified one sample of AhS, sample 91A, which may represent two different lithologies coexisting within a single stone. The predominate lithology type in 91A appears to be that of a C2 chondrite based on mineralogy but also contains olivine, pyroxene, and albite that have ureilite-like compositions. Previous Cr isotope investigations into AhS stones are sparse and what data is available show nearly uniform isotopic composition similar to that of typical ureilites with negative ε54Cr values.

Sanborn, M. E.↗
NASA NTRS1994

Vibrationally excited CS: A new probe of conditions in young protostellar systems

We present the first detection of vibrationally excited C(32)S J = 10-9 and J = 7-6 emission toward a young stellar object (YSO). Toward IRAS 16293-2422, the vibrationally excited C(32)S emission is redshifted approximately 3.9 km/s from the systemic velocity of the core. The emission must arise in warm (T greater than or approximately equal 1000 K), dense (n greater than or approximately equal to 10(exp 11)-10(exp 12) per cc) gas. The most plausible origin for the emission appears to be self-gravitating instabilities in a protostellar accretion disk, which produce waves and shocks.

Walker, Christopher K.↗
DOE OSTI2020

Materials Data on Co8C24(SO7)3 by Materials Project

Co3C10O9Co5C14(SO4)3 is alpha La structured and crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four Co3C10O9 clusters and four Co5C14(SO4)3 clusters. In each Co3C10O9 cluster, there are three inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded in a 4-coordinate geometry to four C+1.33+ atoms. There are a spread of Co–C bond distances ranging from 1.77–1.92 Å. In the second Co2+ site, Co2+ is bonded in a 4-coordinate geometry to four C+1.33+ atoms. There are a spread of Co–C bond distances ranging from 1.76–1.93 Å. In the third Co2+ site, Co2+ is bonded in a 4-coordinate geometry to four C+1.33+ atoms. There are a spread of Co–C bond distances ranging from 1.76–1.92 Å. There are ten inequivalent C+1.33+ sites. In the first C+1.33+ site, C+1.33+ is bonded in a 3-coordinate geometry to three Co2+ atoms. In the second C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the third C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the fourth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.15 Å. In the fifth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the sixth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the seventh C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the eighth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the ninth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the tenth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.15 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In each Co5C14(SO4)3 cluster, there are five inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded in a 2-coordinate geometry to three C+1.33+ and two S2- atoms. There are a spread of Co–C bond distances ranging from 1.75–1.95 Å. There are one shorter (2.18 Å) and one longer (2.29 Å) Co–S bond lengths. In the second Co2+ site, Co2+ is bonded in a 4-coordinate geometry to four C+1.33+ atoms. There are a spread of Co–C bond distances ranging from 1.78–1.93 Å. In the third Co2+ site, Co2+ is bonded in a 2-coordinate geometry to three C+1.33+ and two S2- atoms. There are a spread of Co–C bond distances ranging from 1.75–1.95 Å. There are one shorter (2.18 Å) and one longer (2.29 Å) Co–S bond lengths. In the fourth Co2+ site, Co2+ is bonded in a 4-coordinate geometry to three C+1.33+ and one S2- atom. There are a spread of Co–C bond distances ranging from 1.76–1.88 Å. The Co–S bond length is 2.34 Å. In the fifth Co2+ site, Co2+ is bonded in a 4-coordinate geometry to three C+1.33+ and one S2- atom. There are a spread of Co–C bond distances ranging from 1.76–1.89 Å. The Co–S bond length is 2.34 Å. There are fourteen inequivalent C+1.33+ sites. In the first C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the second C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the third C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the fourth C+1.33+ site, C+1.33+ is bonded in a distorted trigonal planar geometry to one Co2+ and two S2- atoms. Both C–S bond lengths are 1.74 Å. In the fifth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the sixth C+1.33+ site, C+1.33+ is bonded in a distorted single-bond geometry to two Co2+ and one O2- atom. The C–O bond length is 1.19 Å. In the seventh C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the eighth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.15 Å. In the ninth C+1.33+ site, C+1.33+ is bonded in a 1-coordinate geometry to two Co2+ and one S2- atom. The C–S bond length is 1.75 Å. In the tenth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the eleventh C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the twelfth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the thirteenth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. In the fourteenth C+1.33+ site, C+1.33+ is bonded in a linear geometry to one Co2+ and one O2- atom. The C–O bond length is 1.16 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to two Co2+ and one C+1.33+ atom. In the second S2- site, S2- is bonded in a 3-coordinate geometry to two Co2+ and one C+1.33+ atom. In the third S2- site, S2- is bonded in a 3-coordinate geometry to two Co2+ and one C+1.33+ atom. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom. In the twelfth O2- site, O2- is bonded in a single-bond geometry to one C+1.33+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YH24C9(N3O4)3 by Materials Project

YC9H24(N3O4)3 crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four YC9H24(N3O4)3 clusters. Y3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Y–O bond distances ranging from 2.27–2.54 Å. There are nine inequivalent C+2.67+ sites. In the first C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. All C–H bond lengths are 1.10 Å. In the second C+2.67+ site, C+2.67+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. There is one shorter (1.35 Å) and one longer (1.36 Å) C–N bond length. The C–O bond length is 1.27 Å. In the third C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. There is one shorter (1.09 Å) and two longer (1.10 Å) C–H bond length. In the fourth C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. There is one shorter (1.09 Å) and two longer (1.10 Å) C–H bond length. In the fifth C+2.67+ site, C+2.67+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. Both C–N bond lengths are 1.35 Å. The C–O bond length is 1.27 Å. In the sixth C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. There is one shorter (1.09 Å) and two longer (1.10 Å) C–H bond length. In the seventh C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. All C–H bond lengths are 1.10 Å. In the eighth C+2.67+ site, C+2.67+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. Both C–N bond lengths are 1.36 Å. The C–O bond length is 1.27 Å. In the ninth C+2.67+ site, C+2.67+ is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.45 Å. There is one shorter (1.09 Å) and two longer (1.10 Å) C–H bond length. There are nine inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the second N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the third N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the fifth N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the sixth N3- site, N3- is bonded in a trigonal planar geometry to two C+2.67+ and one H1+ atom. The N–H bond length is 1.02 Å. In the seventh N3- site, N3- is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. In the eighth N3- site, N3- is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. In the ninth N3- site, N3- is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. There are twenty-four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the tenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the eleventh H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twelfth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the thirteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the fourteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the fifteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the sixteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the seventeenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the eighteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the nineteenth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twentieth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twenty-first H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twenty-second H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twenty-third H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. In the twenty-fourth H1+ site, H1+ is bonded in a single-bond geometry to one C+2.67+ atom. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Y3+ and one C+2.67+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one C+2.67+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Y3+ and one C+2.67+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Y3+ and one N3- atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Y3+ and one N3- atom. In the sixth O2- site, O2- is bonded in a distorted L-shaped geometry to one Y3+ and one N3- atom. In the seventh O2- site, O2- is bonded in a distorted L-shaped geometry to one Y3+ and one N3- atom. In the eighth O2- site, O2- is bonded in a distorted L-shaped geometry to one Y3+ and one N3- atom. In the ninth O2- site, O2- is bonded in a distorted L-shaped geometry to one Y3+ and one N3- atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one N3- atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one N3- atom. In the twelfth O2- site, O2- is bonded in a single-bond geometry to one N3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

An Engineered Multifunctional Composite for Passive Sensing, Power Harvesting, and In Situ Damage Identification with Enhanced Mechanical Performance

A multifunctional fiber-reinforced composite with passive self-sensing, energy-harvesting, and damage detection capabilities is presented. In this work, barium titanate piezoelectric microparticles are deposited on basalt fibers by a scalable, low-cost, environmentally friendly continuous feed-through process. The resulting composite derives a superior interlaminar shear strength from the microparticle-modified fiber–matrix interfaces. The composite also demonstrates passive self-sensing capabilities that produce electrical signals proportional to various dynamic loading events. Vibration and strain-controlled experiments are performed on composite beams to quantify the sensitivity and power output as a function of input acceleration and strain. Furthermore, these composite-generated electrical signals are used to identify in situ damage initiation for structural health monitoring to inform composite damage prior to structural failure. In brief, this truly multifunctional composite simultaneously displays a sensitivity of 0.5–2.6 mV g -1 at a resolution of 0.045–0.20g (g = gravitational acceleration), energy harvesting in the range of nW cc -1 , and prediction of early damage by exhibiting 0.017–1.17 mV peaks in voltage–time history profiles while assuring ≈20% improved interlaminar shear strength.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2025

Composite biopolymer electrolytes for high-performance reversible zinc-air batteries

Zinc-air batteries (ZABs) are regarded as one of the most promising candidates for next-generation energy storage systems due to their inherent safety, high energy density, and low cost. In this study, we optimized the composition of gel polymer electrolytes (GPEs), which play a crucial role in enhancing ZAB reversibility due to their water retention capabilities. The GPEs are synthesized using a combination of polyacrylic acid (PAA), polyacrylamide (PAM), and biopolymer kappa-carrageenan (KC), with and without additional additives. Among these, the composite GPE containing KC, PAA, and PAM demonstrated superior ionic conductivity (6.68 mS/cm at 30 °C) and enhanced water retention compared to the PAA–PAM-based GPE. Furthermore, this composite electrolyte operates within a wider electrochemical window of −1.0 V–2.2 V. A bifunctional catalyst, nickel–iron layered double hydroxide (NiFe-LDH), is electrochemically synthesized on a modified activated carbon cloth (CC). The catalyst loading is optimized based on oxygen evolution reaction (OER) performance, showing an overpotential of 555 mV. The oxygen reduction reaction (ORR) occurred at a half-wave potential of 0.620 V, which is lower than that of Pt/C (0.852 V), indicating better catalytic activity. The KC based cell exhibit better cycling stability than PAA–PAM-based GPE. The electrochemical performance of ZAB cells is evaluated under various atmospheres: ambient air and humid conditions and temperatures. Notably, in a humid environment, the cells achieved extended cycling stability, operating for over 500 h—significantly longer than under open-air conditions. Overall, this study highlights the importance of tailored GPE design and efficient bifunctional catalysts to enhance the performance and longevity of zinc-air batteries for long-duration energy storage applications.

Catalyst↗
DOE OSTI2020

Materials Data on H4CN5Cl by Materials Project

(CN5H4)2Cl2 crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four hydrochloric acid molecules and four CN5H4 clusters. In each CN5H4 cluster, C4+ is bonded in a trigonal planar geometry to three N+1.40- atoms. There is two shorter (1.32 Å) and one longer (1.40 Å) C–N bond length. There are five inequivalent N+1.40- sites. In the first N+1.40- site, N+1.40- is bonded in a distorted bent 120 degrees geometry to one C4+ and one N+1.40- atom. The N–N bond length is 1.25 Å. In the second N+1.40- site, N+1.40- is bonded in a linear geometry to two N+1.40- atoms. The N–N bond length is 1.14 Å. In the third N+1.40- site, N+1.40- is bonded in a single-bond geometry to one N+1.40- atom. In the fourth N+1.40- site, N+1.40- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. In the fifth N+1.40- site, N+1.40- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.03 Å) and one longer (1.04 Å) N–H bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N+1.40- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N+1.40- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N+1.40- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N+1.40- atom.

36 MATERIALS SCIENCE↗
NASA NTRS2017

A New Type of Foreign Clast in A Polymict Ureilite: A CAI or AL-Rich Chondrule

Introduction: Polymict ureilites are breccias interpreted to represent regolith formed on a ureilitic asteroid [1-3]. They consist of approximately 90-95% clasts of various ureilite types (olivine-pyroxene rocks with Fo 75-95), a few % indigenous feldspathic clasts, and a few % foreign clasts [4-20]. The foreign clasts are diverse, including fragments of H, L, LL and R chondrites, angrites, other achondrites, and dark clasts similar to CC [6,7,9-19]. We report a new type of foreign clast in polymict ureilite DaG 999. Methods: Clast 8 in Dar al Gani (DaG) 999/1 (Museum fur Naturkunde) was discovered during a survey of feldspathic clasts in polymict ureilites [19,20]. It was studied by BEI, EMPA, and X-ray mapping on the JEOL 8530F electron microprobe at ARES, JSC. Petrography and Mineral Compositions: Clast 8 is sub-rounded to irregular in shape, approximately 85 micrometers in diameter, and consists of approximately 68% pyroxene and 32% mesostasis (by area). Part of the pyroxene (top half of clast in Fig. 1a and 2) shows a coarse dendritic morphology; the rest appears massive. Mesostasis may be glassy and contains fine needles/grains of pyroxene. The pyroxene has very high CaO (23.5 wt.%) and Al2O3 (19.7 wt.%), with the formula: (Ca(0.91)Mg(0.63)Fe(0.01)Al(sup VI) (0.38)Cr(0.01)Ti(0.05)1.99 Si2O6. The bulk mesostasis also has very high Al2O3 (approximately 26 wt.%). A bulk composition for the clast was obtained by combining modal abundances with phase compositions (Table 1, Fig. 3). Discussion: The pyroxene in clast 8 has a Ca-Al-(Ti)- rich (fassaitic) composition that is clearly distinct from compositions of pyroxenes in main group ureilites [22] or indigenous feldspathic clasts in polymict ureilites [4-8]. It also has significantly higher Al than fassaite in angrites (up to approximately 12 wt.% [23]), which occur as xenoliths in polymict ureilites. Ca-Al-Ti rich pyroxenes are most commonly found in CAIs, Al-rich chondrules and other types of refractory inclusions in chondrites [21,24-31]. However, the clast 8 pyroxene matches only the most Al-Ca-rich of these, e.g., pyroxenes in type B CAIs in CV3 chondrites [25,30,31], a pyroxene-hibonite spherule and a pyroxene-anorthitespinel fragment from unique CC Acfer 094 [29], and one Al-rich chondrule from Chainpur (LL3.4) [21]. The mineralogy of clast 8 is not consistent with the mineral assemblages of any of these objects (since it lacks hibonite, spinel and/or anorthite), which suggests that it is unrepresentatively sectioned or is a fragment of a more mineralogically diverse object. Its bulk composition (Table 1; Fig. 3) is similar to bulk compositions of some Al-rich chondrules, as well as those of Type C CAIs (which plot in the sp+An+L field in Fig. 3), although it is enriched in silica relative to type C CAIs [e.g., 31]. This suggests a more likely affinity to Al-rich chondrules, although most Al-rich chondrules have less Al-Ca-rich pyroxene [21,26,27]. These bulk compositional comparisons may not be definitive, however, if the clast is unrepresentatively sampled. One of eleven Al-rich chondrules from UOCs described by [21] has textural and compositional characteristics that make it a possible progenitor type for clast 8. This chondrule (Chainpur 1251-14-2) is anorthiteporphyritic, with an interstitial dendritic intergrowth of pyroxene (similar in composition to that in clast 8) and plagioclase [21]. Clast 8 is conceivably a fragment from the interstitial area of such an object. The occurrence of glassy mesostasis (in clast 8) rather than plagioclase may not be a significant difference; it could result from a difference only in cooling rate. Al-rich chondrules with glassy mesostasis are rare, and known occurrences are Ca-poor [26], unlike clast 8. Polymict ureilites are known to contain xenoliths of various chondrites (including OC, R and CC) as well as individual ferromagnesian and silica-pyroxene chondrules probably derived from OC or RC [6,9,15,16,18]. This is the first report of an individual chondritic refractory inclusion as a xenolith in a polymict ureilite. An RC-like sample from anomalous polymict ureilite Almahata Sitta contains CAIs, but they are spinel-rich and not similar to clast 8 [13,14]. Further studies of this clast (which, unfortunately, may not be possible), or the discovery of additional (more representative?) materials of this type would be needed to determine the exact nature of this xenolith and the type of chondrite from which it is derived.

Goodrich, C. A.↗
DOE OSTI2025

In Situ MOF Pyrolysis Construction of Hierarchical Porous Co‐Nanoparticles/Carbon Cloth Composites for Enhanced Electromagnetic Wave Shielding and Absorption

The development of high-performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs. This study pioneers a hierarchical porous Co nanoparticle/carbon cloth (Co/CC) composite via controlled annealing of a Co-MOF precursor on carbon cloth. The Co-MOF served a dual role as both magnetic source and pore-forming agent, enabling in situ generation of uniformly dispersed Co nanoparticles and creation of abundant pores/interfaces on the CC fibers during pyrolysis. This unique architecture synergistically enhanced dielectric loss (via interfacial/dipolar polarization) and magnetic loss (via natural resonance, exchange interactions, and eddy currents), significantly improving impedance matching. The hierarchical pores further functioned as integrated “absorption–reflection” units for efficient electromagnetic energy attenuation. Consequently, the Co/CC composite annealed at 800°C (Co/CC-800) achieves minimum reflection loss (−40.69 dB) and 120% effective absorption bandwidth extension (6.16 GHz) as a filler, and exhibits superior electromagnetic interference shielding effectiveness (46.66 dB) as an integrated component. Significantly, Co/CC-800 demonstrated robust photothermal and electrothermal conversion capabilities, ensuring operational stability in ice-covered and humid harsh environments. This work pioneers a pore-structure-mediated strategy to harmonize dielectric–magnetic synergy, providing a new paradigm for designing advanced multifunctional electromagnetic protection materials.

dielectric‐magnetic synergy↗
NASA NTRS2011

A Comparison of Multivariate and Pre-Processing Methods for Quantitative Laser-Induced Breakdown Spectroscopy of Geologic Samples

The ChemCam instrument selected for the Curiosity rover is capable of remote laser-induced breakdown spectroscopy (LIBS).[1] We used a remote LIBS instrument similar to ChemCam to analyze 197 geologic slab samples and 32 pressed-powder geostandards. The slab samples are well-characterized and have been used to validate the calibration of previous instruments on Mars missions, including CRISM [2], OMEGA [3], the MER Pancam [4], Mini-TES [5], and Moessbauer [6] instruments and the Phoenix SSI [7]. The resulting dataset was used to compare multivariate methods for quantitative LIBS and to determine the effect of grain size on calculations. Three multivariate methods - partial least squares (PLS), multilayer perceptron artificial neural networks (MLP ANNs) and cascade correlation (CC) ANNs - were used to generate models and extract the quantitative composition of unknown samples. PLS can be used to predict one element (PLS1) or multiple elements (PLS2) at a time, as can the neural network methods. Although MLP and CC ANNs were successful in some cases, PLS generally produced the most accurate and precise results.

Anderson, R. B.↗
DOE OSTI2024

Elucidating the chemical dynamics of the elementary reactions of the 1-propynyl radical (CH 3 CC; X 2 A 1 ) with 2-methylpropene ((CH 3 ) 2 CCH 2 ; X 1 A 1 )

Exploiting the crossed molecular beam technique, we studied the reaction of the 1-propynyl radical (CH 3 CC; X 2 A 1 ) with 2-methylpropene (isobutylene; (CH 3 ) 2 CCH 2 ; X 1 A 1 ) at a collision energy of 38 ± 3 kJ mol –1 . The experimental results along with ab initio and statistical calculations revealed that the reaction has no entrance barrier and proceeds via indirect scattering dynamics involving C 7 H 11 intermediates with lifetimes longer than their rotation period(s). The reaction is initiated by the addition of the 1-propynyl radical with its radical center to the π-electron density at the C1 and/or C2 position in 2-methylpropene. Further, the C 7 H 11 intermediate formed from the C1 addition either emits atomic hydrogen or undergoes isomerization via [1,2-H] shift from the CH 3 or CH 2 group prior to atomic hydrogen loss preferentially leading to 1,2,4-trimethylvinylacetylene (2-methylhex-2-en-4-yne) as the dominant product. The molecular structures of the collisional complexes promote hydrogen atom loss channels. RRKM results show that hydrogen elimination channels dominate in this reaction, with a branching ratio exceeding 70%. Since the reaction of the 1-propynyl radical with 2-methylpropene has no entrance barrier, is exoergic, and all transition states involved are located below the energy of the separated reactants, bimolecular collisions are feasible to form trimethylsubstituted 1,3-enyne (p1) via a single collision event even at temperatures as low as 10 K prevailing in cold molecular clouds such as G+0.693. As a result, the formation of trimethylsubstituted vinylacetylene could serve as the starting point of fundamental molecular mass growth processes leading to di- and trimethylsubstituted naphthalenes via the HAVA mechanism.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗