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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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Crystal structure of cytochrome P450 NysL and the structural basis for stereo- and regio-selective oxidation of antifungal macrolides
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Electric field-assisted embedding of fiber optic sensors in structural materials for structural health monitoring
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Crystal structure of hetero hexameric 11S seed storage protein of hazelnut
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Structural basis for the broad antigenicity of the computationally optimized influenza hemagglutinin X6
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Insights into the structure and dynamics of K + ions at the muscovite–water interface from machine learning potential simulations
The surfaces of many minerals are covered by naturally occurring cations that become partially hydrated and can be replaced by hydronium or other cations when the surface is exposed to water or an aqueous solution. These ion exchange processes are relevant to various chemical and transport phenomena, yet elucidating their microscopic details is challenging for both experiments and simulations. Here, in this work, we make a first step in this direction by investigating the behavior of the native K + ions at the interface between neat water and the muscovite mica (001) surface with ab-initio -based machine learning molecular dynamics and enhanced sampling simulations. Our results show that the desorption of the surface K + ions in pure ion-free water has a significant free energy barrier irrespective of their local surface arrangement. In contrast, facile K + diffusion between mica’s ditrigonal cavities characterized by different Al/Si orderings is observed. This behavior suggests that the K + ions may favor a dynamic disordered surface arrangement rather than complete desorption when exposed to deionized water.
Dataset for Leveraging CryoEM and AI-Driven Morphological Feature Analysis for Insights on Bacterial Structures
This repository hosts an AI-assisted image segmentation and analysis pipeline for Pantoea sp. YR343 cryo-electron microscopy (cryoEM) datasets. The workflow automates membrane thickness measurements, flagella detection, and field-of-view (FOV) screening from low-dose, high-resolution cryoEM micrographs eliminating the need for slow manual annotation. By integrating deep-learning based segmentation (YOLOv11) with quantitative post-processing, this toolkit provides a scalable and reproducible way to study bacterial morphology under hydrated, near-native conditions. The GitHub repository for AI-based tools for cryoEM bacteria ultrastructures can be found here: https://github.com/Sireesiru/Cryo-EM-Ultrastructures/tree/main
RFQ-Structure Power Requirements: Analysis of Two Structure Designs
Abstract not provided.
Recommendation for the writing of reports on the fatigue of test bars and structures recommendations pour la redaction de rapports sur la fatigue des eprouvettes et des structures
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Analytical and experimental determination of localized structure to be used in laboratory vibration testing of shell structure-mounted components, Saturn V Progress report, May - Nov. 1966
Procedure for designing localized shell and finite difference computer program applications to Saturn V vibration testing project
Fabrication of a 1/10 dynamically scaled geometrically similar, structural replica of the Apollo service module shell and structure, phase 2 Final report
Fabrication of scale model of Apollo service module and lunar module cone extension, fairing between command and service modules, and modified command module base plate and sting
Study of technology requirements for structures of large launch vehicles. Volume 3 - Survey of advanced structures technologies Final report
Aluminum honeycombs in launch vehicles and other configurations
Utilization of ERTS-A data in geological evaluation regional planning, forest management, and water management in North Carolina. 3: Mineral resources, geological structures, and landform surveys. A: Structural surveys
There are no author-identified significant results in this report.
Structural studies on carbon materials for advanced space technology. Part 1: Structure and oxidation behavior of some carbon/carbon composite materials
The microstructure and some microstructural effects of oxidation have been investigated for laminar carbon fiber cloth/cloth binder matrix composite materials. It was found that cloth wave is important in determining the macrostructure of the composites X-ray diffraction analysis showed that the composites were more graphitic than the constituent fiber phases, indicating a graphitic binder matrix phase. Various tests which were conducted to investigate specific properties of the material are described. It was learned that under the moderate temperature and oxidant flow conditions studied, C-700, 730 materials exhibit superior oxidation resistance primarily because of the inhibiting influence of the graphitized binder matrix.
Use of semi-periodic structural configuration for improving the sonic fatigue life of stiffened structures
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Isomeric structures and structural transformations in small clusters
The temperature dependence of the energies of the isomers of a seven-particle system is studied with a view toward understanding ergodicity problems in Monte Carlo simulations. It is found that the phase space of particles in a cluster is not ergodic at lower temperatures.
Kerogen structures in recently-deposited algal mats at Laguna Mormona, Baja California: A model system for the determination of kerogen structures in ancient sediments
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