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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.

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At least 685 records · Page 38
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on BOs3 by Materials Project

Os3B crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Os1- is bonded to eight equivalent Os1- and four equivalent B3+ atoms to form distorted OsB4Os8 cuboctahedra that share corners with four equivalent BOs12 cuboctahedra, corners with fourteen equivalent OsB4Os8 cuboctahedra, edges with six equivalent BOs12 cuboctahedra, edges with twelve equivalent OsB4Os8 cuboctahedra, faces with four equivalent BOs12 cuboctahedra, and faces with sixteen equivalent OsB4Os8 cuboctahedra. There are a spread of Os–Os bond distances ranging from 2.59–2.87 Å. There are two shorter (2.51 Å) and two longer (2.73 Å) Os–B bond lengths. B3+ is bonded to twelve equivalent Os1- atoms to form BOs12 cuboctahedra that share corners with six equivalent BOs12 cuboctahedra, corners with twelve equivalent OsB4Os8 cuboctahedra, edges with eighteen equivalent OsB4Os8 cuboctahedra, faces with eight equivalent BOs12 cuboctahedra, and faces with twelve equivalent OsB4Os8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiBe2Os by Materials Project

LiBe2Os crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two LiBe2Os ribbons oriented in the (1, 0, 0) direction. Li is bonded in a linear geometry to two equivalent Be atoms. Both Li–Be bond lengths are 2.56 Å. Be is bonded in a linear geometry to one Li and one Os atom. The Be–Os bond length is 2.11 Å. Os is bonded in a linear geometry to two equivalent Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2VOs by Materials Project

Hf2VOs crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Hf2VOs ribbons oriented in the (1, 0, 0) direction. Hf is bonded in a linear geometry to one V and one Os atom. The Hf–V bond length is 2.70 Å. The Hf–Os bond length is 2.30 Å. V is bonded in a linear geometry to two equivalent Hf atoms. Os is bonded in a linear geometry to two equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ti2OsRh by Materials Project

Ti2OsRh is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ti is bonded in a body-centered cubic geometry to four equivalent Os and four equivalent Rh atoms. All Ti–Os bond lengths are 2.69 Å. All Ti–Rh bond lengths are 2.69 Å. Os is bonded in a body-centered cubic geometry to eight equivalent Ti atoms. Rh is bonded in a body-centered cubic geometry to eight equivalent Ti atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc2CdOs by Materials Project

Sc2OsCd is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sc is bonded in a body-centered cubic geometry to four equivalent Os and four equivalent Cd atoms. All Sc–Os bond lengths are 2.91 Å. All Sc–Cd bond lengths are 2.91 Å. Os is bonded in a body-centered cubic geometry to eight equivalent Sc atoms. Cd is bonded in a distorted body-centered cubic geometry to eight equivalent Sc atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgBe2Os by Materials Project

MgBe2Os crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two MgBe2Os ribbons oriented in the (1, 0, 0) direction. Mg is bonded in a linear geometry to two equivalent Be atoms. Both Mg–Be bond lengths are 2.49 Å. Be is bonded in a linear geometry to one Mg and one Os atom. The Be–Os bond length is 2.08 Å. Os is bonded in a linear geometry to two equivalent Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Risk‐based, response‐adapted therapy for early‐stage extranodal nasal‐type NK /T‐cell lymphoma in the modern chemotherapy era: A China Lymphoma Collaborative Group study

Abstract We aimed to determine the survival benefits of chemotherapy (CT) added to radiotherapy (RT) in different risk groups of patients with early‐stage extranodal nasal‐type NK/T‐cell lymphoma (ENKTCL), and to investigate the risk of postponing RT based on induction CT responses. A total of 1360 patients who received RT with or without new‐regimen CT from 20 institutions were retrospectively reviewed. The patients had received RT alone, RT followed by CT (RT + CT), or CT followed by RT (CT + RT). The patients were stratified into different risk groups using the nomogram‐revised risk index (NRI). A comparative study was performed using propensity score‐matched (PSM) analysis. Adding new‐regimen CT to RT (vs RT alone) significantly improved overall survival (OS, 73.2% vs 60.9%, P < .001) and progression‐free survival (PFS, 63.5% vs 54.2%, P < .001) for intermediate‐risk/high‐risk patients, but not for low‐risk patients. For intermediate‐risk/high‐risk patients, RT + CT and CT + RT resulted in non‐significantly different OS (77.7% vs 72.4%; P = .290) and PFS (67.1% vs 63.1%; P = .592). For patients with complete response (CR) after induction CT, initiation of RT within or beyond three cycles of CT resulted in similar OS (78.2% vs 81.7%, P = .915) and PFS (68.2% vs 69.9%, P = .519). For patients without CR, early RT resulted in better PFS (63.4% vs 47.6%, P = .019) than late RT. Risk‐based, response‐adapted therapy involving early RT combined with CT is a viable, effective strategy for intermediate‐risk/high‐risk early‐stage patients with ENKTCL in the modern treatment era.

Qi, Shu‐Nan↗
DOE OSTI2022

Survival outcomes of patients with head and neck squamous cell cancer with hepatitis B virus infection: An analysis from an endemic tertiary center

Abstract Background Hepatitis B virus (HBV) affects the occurrence and survival outcome of various malignant disorders. The study aimed to evaluate the survival outcome of head and neck squamous cell cancer (HNSCC) patients with or without HBV infection. Methods This study included patients with HNSCC who visited Taichung Veterans General Hospital from 2007 to 2015. HBV infection was defined by hepatitis B surface antigen (HBsAg) seropositivity. By propensity score matching, we compared survival outcomes, including progression‐free survival (PFS) and overall survival (OS), among patients with or without HBV infection. Results The prevalence of HBV infection in our cohort was 12.3%. Among the 1,015 patients included in the matched analysis, a higher risk of baseline liver cirrhosis (11.3% vs. 3.4%, p < 0.001) and initial hepatic dysfunction (10.8% vs. 5.4%, p = 0.005) rates were observed than those without HBV infection at baseline. The 5‐year OS was 43.1% and 53.2% ( p < 0.001) and the 5‐year PFS was 37.4% and 42.3% ( p = 0.007) in patients with and without HBV infection, respectively. The incidence of subsequent hepatic dysfunction showed no difference between patients with and without HBV infection (29.6% vs. 26.8%, p = 0.439). Conclusions Patients with HNSCC and HBV infection were younger and had a higher risk of cirrhosis compared to those without HBV infection. Moreover, HBV infection significantly influenced the OS and PFS outcomes but not subsequent hepatic dysfunction in patients with HNSCC.

Lai, Cheng‐Lun↗
DOE OSTI2020

Validation of Stage N3 of the Eighth Edition AJCC Staging System for Nasopharyngeal Carcinoma

Objectives To validate stage nodal (N)3 of the 8th edition American Joint Committee on Cancer (AJCC) staging system for nasopharyngeal carcinoma (NPC). Methods This retrospective cohort study extracted NPC patients from the Surveillance, Epidemiology, and End Results database between 2004 and 2016. Pathologically confirmed patients with complete data of level IV, N3a, and N3b lymph node metastasis were investigated. The included patients were divided into level IV, N3a, and N3b groups. Five‐year overall survival (OS) and cancer‐specific survival (CSS) were compared among the three groups. Results A total of 693 patients were included: 285 (41.13%) patients in the level IV group, 124 (17.89%) patients in the N3a group, and 284 (40.98%) patients in the N3b group. The 5‐year OS (57.1%, 55.0%, and 55.2%) and CSS (64.4%, 63.5%, and 64.4%) were not different among the level IV, N3a, and N3b groups. Multivariate regression analysis revealed that N stage was not an independent prognostic factor for OS (hazard ratio [HR] = 1.03, 95% confidence interval [CI]: 0.91–1.17; P = .65) or CSS (HR = 1.03, 95% CI: 0.89–1.19; P = .70). Conclusion Stage N3 of the 8th edition AJCC staging system for NPC is reasonable. Level of Evidence III Laryngoscope , 131:535–540, 2021

Pan, Xin‐Bin↗
DOE OSTI2023

Exceptional high temperature retention in Al 0.93 B 0.07 N films

This paper reports the retention behavior for Al 0.93 B 0.07 N thin films, a member of the novel family of wurtzite ferroelectrics. Our experiments suggest that bipolar cycling of metal (Pt/W)/Al 0.93 B 0.07 N/W/Al 2 O 3 film stacks first induced wake-up and then a region of constant switchable polarization. Here, the films showed excellent retention of the stored polarization state. As expected, data retention was slightly inferior in the opposite state (OS) measurements. However, it is noted that even after 3.6 × 10 6 s (1000 h) at 200 °C, the OS signal margin still exceeded 200 μC/cm 2 . The predicted OS retention is 82% after 10 yr baking at 200 °C.

36 MATERIALS SCIENCE↗
DOE OSTI2022

$\textit{J}$ = 0 nonmagnetic insulating state in K 2 OsX 6 ($\textit{X}$ = F, Cl, and Br)

In 4$\textit{d}$ /5$\textit{d}$ transition-metal systems, many interesting physical properties arise from the interplay of bandwidth, electronic correlations, and spin-orbit interactions. Here, using ab initio density functional theory, we systematically study the double-perovskite-like system K 2 OsX6 ($\textit{X}$ = F, Cl, and Br) with a $5d^4$ electronic configuration. In this work, our main result is that the $\textit{J}$ = 0 nonmagnetic insulating state develops in this system, induced by strong spin-orbit coupling (SOC). Specifically, the well-separated OsX 6 octahedra lead to the cubic crystal-field limit and result in dramatically decreasing hoppings among nearest neighbor Os-Os sites. In this case, the three degenerate $t_{2g}$ orbitals are reconstructed into two “effective” $j_{\text{eff}}$ ($j_{\text{eff}}$ = 1/2 and $j_{\text{eff}}$ = 3/2 states) states separated by the strong SOC, opening a gap with four electrons occupying the$j_{\text{eff}}$ = 3/2 orbitals. Furthermore, the hybridization between the Os 5$\textit{d}$ orbitals and the $\textit{X}$ ($\textit{X}$ = F, Cl, and Br) $\textit{p}$ orbitals increases from F to Br, leading the electrons in K 2 OsF 6 to be more localized than in K 2 OsCl 6 and K 2 OsBr 6 , resulting in a smaller bandwidth for K 2 OsF 6 than in the Cl- or Br-cases. Our results provide guidance to experimentalists and theorists working on this interesting family of osmium halides.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2021

Google/Makani Energy Kite Modeling (CRADA CRD-18-00569 Final Report)

In support of Makani’s energy kite development program, Makani engaged with NREL to develop, verify, and document a multiphysics engineering model of a megawatt-scale tethered energy kite (named KiteFAST). After the original development of KiteFAST was completed, Makani further engaged NREL to develop a software enhancement of KiteFAST to enable the dynamics modeling of an energy kite tethered to a floating offshore platform (named KiteFAST-OS). Before this project, the capability to model the aero-hydro-servo-elastic dynamics of an airborne wind energy (AWE) system with electricity generation on the flying device (fly gen) and crosswind flight operation did not exist. Such physics-based modeling capability is needed for loads analysis, structural design, and certification of energy kites. Throughout the project, an exclusive license kept KiteFAST and KiteFAST-OS available only to Makani, NREL, and its counterparts. With the ending of Makani, the KiteFAST and KiteFAST-OS software were merged into a single code base (named KiteFAST), the exclusive license was terminated, and the source code, documentation, and example models were released publicly.

17 WIND ENERGY↗
DOE OSTI2020

Dynamically adapting mechanism for translation lookaside buffer shootdowns

An operating system (OS) of a processing system having a plurality of processor cores determines a cost associated with different mechanisms for performing a translation lookaside buffer (TLB) shootdown in response to, for example, a virtual address being remapped to a new physical address, and selects a TLB shootdown mechanism to purge outdated or invalid address translations from the TLB based on the determined cost. In some embodiments, the OS selects an inter-processor interrupt (IPI) as the TLB shootdown mechanism if the cost associated with sending an IPI is less than a threshold cost. In some embodiments, the OS compares the cost of using an IPI as the TLB shootdown mechanism versus the cost of sending a hardware broadcast to all processor cores of the processing system as the shootdown mechanism and selects the shootdown mechanism having the lower cost.

42 ENGINEERING↗
DOE OSTI2020

Materials Data on Ba(POs)2 by Materials Project

Ba(OsP)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight equivalent Os2- atoms. All Ba–Os bond lengths are 3.69 Å. Os2- is bonded to four equivalent Ba2+ and four equivalent P1+ atoms to form a mixture of distorted corner, edge, and face-sharing OsBa4P4 tetrahedra. All Os–P bond lengths are 2.35 Å. P1+ is bonded in a 4-coordinate geometry to four equivalent Os2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(BOs)4 by Materials Project

Nd(OsB)4 is alpha Pu-derived structured and crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. Nd2+ is bonded in a 8-coordinate geometry to eight equivalent Os2- atoms. There are four shorter (3.22 Å) and four longer (3.23 Å) Nd–Os bond lengths. Os2- is bonded in a 4-coordinate geometry to two equivalent Nd2+ and four equivalent B+1.50+ atoms. There are a spread of Os–B bond distances ranging from 2.14–2.19 Å. B+1.50+ is bonded in a 4-coordinate geometry to four equivalent Os2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Si2Os by Materials Project

OsSi2 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Os8+ sites. In the first Os8+ site, Os8+ is bonded in a 8-coordinate geometry to eight Si4- atoms. There are a spread of Os–Si bond distances ranging from 2.48–2.53 Å. In the second Os8+ site, Os8+ is bonded in a 8-coordinate geometry to eight Si4- atoms. There are a spread of Os–Si bond distances ranging from 2.47–2.50 Å. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 4-coordinate geometry to four Os8+ and five Si4- atoms. There are a spread of Si–Si bond distances ranging from 2.55–2.72 Å. In the second Si4- site, Si4- is bonded in a 4-coordinate geometry to four Os8+ and five Si4- atoms. There are one shorter (2.62 Å) and one longer (2.71 Å) Si–Si bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(POs)2 by Materials Project

Eu(OsP)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a 8-coordinate geometry to eight equivalent Os2- atoms. All Eu–Os bond lengths are 3.38 Å. Os2- is bonded in a 12-coordinate geometry to four equivalent Eu2+ and four equivalent P1+ atoms. All Os–P bond lengths are 2.34 Å. P1+ is bonded in a 4-coordinate geometry to four equivalent Os2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pu(SiOs)2 by Materials Project

PuOs2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pu4+ is bonded in a 8-coordinate geometry to eight equivalent Os2- atoms. All Pu–Os bond lengths are 3.18 Å. Os2- is bonded in a 4-coordinate geometry to four equivalent Pu4+ and four equivalent Si atoms. All Os–Si bond lengths are 2.40 Å. Si is bonded in a 5-coordinate geometry to four equivalent Os2- and one Si atom. The Si–Si bond length is 2.38 Å.

36 MATERIALS SCIENCE↗