SEARCH · Search NASA
Results for “stem”
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.
Understanding individual defects in CdTe thin-film solar cells via STEM: From atomic structure to electrical activity
Here in this paper we review a systematic study of the structure-property correlations of a series of defects in CdTe solar cells. A variety of experimental methods, including aberration-corrected scanning transmission electron microscopy, electron energy loss spectroscopy, energy dispersive X-ray spectroscopy, and electron-beam-induced current have been combined with density-functional theory. The research traces the connections between the structures and electrical activities of individual defects including intra-grain partial dislocations, grain boundaries and the CdTe/CdS interface. The interpretations of the physical origin underlying the structure-property correlation provide insights that should further the development of future CdTe solar cells.
A metabolomic assessment of NAC154 transcription factor overexpression in field grown poplar stem wood
Not Available
Highly efficient differentiation of embryonic stem cells into adipocytes by ascorbic acid
Not Available
Controlled release of dextrin-conjugated growth factors to support growth and differentiation of neural stem cells
Not Available
Generation of human induced pluripotent stem cell lines from sporadic, sporadic frontotemporal dementia, familial SOD1, and familial C9orf72 amyotrophic lateral sclerosis (ALS) patients
Not Available
Progressive Chromatin Condensation and H3K9 Methylation Regulate the Differentiation of Embryonic and Hematopoietic Stem Cells
Not Available
A Non-Stem-Loop CRISPR RNA Is Processed by Dual Binding Cas6
Not Available
Adipose-derived stem cell sheet transplantation therapy in a porcine model of chronic heart failure
Not Available
Point Defect Characterization in HAADF-STEM Images Using Multivariate Statistical Analysis
Quantitative analysis of point defects is demonstrated through the use of multivariate statistical analysis. This analysis consists of principal component analysis for dimensional estimation and reduction, followed by independent component analysis to obtain physically meaningful, statistically independent factor images. Results from these analyses are presented in the form of factor images and scores. Factor images show characteristic intensity variations corresponding to physical structure changes, while scores relate how much those variations are present in the original data. The application of this technique is demonstrated on a set of experimental images of dislocation cores along a low-angle tilt grain boundary in strontium titanate. A relationship between chemical composition and lattice strain is highlighted in the analysis results, with picometer-scale shifts in several columns measurable from compositional changes in a separate column.
Seeing the atoms more clearly: STEM imaging from the Crewe era to today
Explore the source record for details and available documents.
Is there a Stobbs factor in atomic-resolution STEM-EELS mapping?
Explore the source record for details and available documents.
STEM-EDX tomography of bimetallic nanoparticles: A methodological investigation
Not Available