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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 973 records · Page 54
All sourcesNASA NTRSDOE OSTI
DOE OSTI2014

Future STEM Leaders Prepare for the National Science Bowl

Each year, students from across the country converge on Washington, DC, for the National Science Bowl, an intense academic competition that tests the students' knowledge in science, engineering, chemistry, math and Earth science. Follow one team, from Washington DC's Woodrow Wilson High School, as they prepare for and compete in the 2014 National Science Bowl.

99 GENERAL AND MISCELLANEOUS↗
DOE OSTI2022

2.4.2.405 - Water Power STEM Workforce Development (Marine Energy)

As interest in renewable energy grows, marine energy (ME) technologies will continue to play a growing role in reaching our nation's clean energy objectives. As it is still a nascent industry, developing a ME workforce will require a wide range of expertise and tight competition with other energy sectors. The industry needs to attract and train talent to help develop the workforce pipeline. WPTO efforts to address these needs include more programs, improved program accessibility, and an increased awareness of ME as a renewable energy career (secondary school, vocational and apprenticeship programs, and undergraduate curricula). There is much more work to be done.

ENERGY PLANNING, POLICY, AND ECONOMY,ENGINEERING,H↗
DOE OSTI2024

Expression of a mammalian RNA demethylase increases flower number and floral stem branching in Arabidopsis thaliana

Abstract RNA methylation plays a central regulatory role in plant biology and is a relatively new target for plant improvement efforts. In nearly all cases, perturbation of the RNA methylation machinery results in deleterious phenotypes. However, a recent landmark paper reported that transcriptome‐wide use of the human RNA demethylase FTO substantially increased the yield of rice and potatoes. Here, we have performed the first independent replication of those results and demonstrated broader transferability of the trait, finding increased flower and fruit count in the model species Arabidopsis thaliana . We also performed RNA‐seq of our FTO‐transgenic plants, which we analyzed in conjunction with previously published datasets to detect several previously unrecognized patterns in the functional and structural classification of the upregulated and downregulated genes. From these, we present mechanistic hypotheses to explain these surprising results with the goal of spurring more widespread interest in this promising new approach to plant engineering.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2021

Interferometric 4D-STEM for Lattice Distortion and Interlayer Spacing Measurements of Bilayer and Trilayer 2D Materials

Van der Waals materials composed of stacks of individual atomic layers have attracted considerable attention due to their exotic electronic properties that can be altered by, e.g., manipulating the twist angle of bilayer materials or the stacking sequence of trilayer materials. To fully understand and control the unique properties of these few-layer materials, a technique that can provide information about their local in-plane structural deformations, twist direction, and out-of-plane structure is needed. In principle, interference in overlap regions of Bragg disks originating from separate layers of a material encodes 3D information about the relative positions of atoms in the corresponding layers. Here, an interferometric 4D scanning transmission electron microscopy technique is described that utilizes this phenomenon to extract precise structural information from few-layer materials with nm-scale resolution. It is demonstrated how this technique enables measurement of local pm-scale in-plane lattice distortions as well as twist direction and average interlayer spacings in bilayer and trilayer graphene, and therefore provides a means to better understand the interplay between electronic properties and precise structural arrangements of few-layer 2D materials.

36 MATERIALS SCIENCE↗
DOE OSTI2013

A Singular Differential Equation Stemming from an Optimal Control Problem in Financial Economics

We consider the ordinary differential equation <##> } x 2 u &#x2033; = a x u &#x2032; + b u &#x2212;<!-- ??? --> c } }( u &#x2032; &#x2212;<!-- ??? --> 1 } }) 2 , x &#x2208;<!-- ??? --> }( 0 , x 0 }) , $$ x^2 u''=axu'+bu-c /bigl(u'-1/bigr)^2, /quad x/in(0,x{sub 0}), $$ x{sup 2}u{sup ″}=axu{sup ′}+bu−c(u{sup ′}−1){sup 2}, x∈(0,x{sub 0}), </##> with <##> } a &#x2208;<!-- ??? --> } }R , b &#x2208;<!-- ??? --> } }R $ a/in/mathbb{R}, b/in/mathbb{R} $ a∈R,b∈R </##>, c>0 and the singular initial condition u(0)=0, which in financial economics describes optimal disposal of an asset in a market with liquidity effects. It is shown in the paper that if a+b<0 then no continuous solutions exist, whereas if a+b>0 then there are infinitely many continuous solutions with indistinguishable asymptotics near 0. Moreover, it is proved that in the latter case there is precisely one solution u corresponding to the choice x{sub 0}=∞ which is such that 0≤u(x)≤x for all x>0, and that this solution is strictly increasing and concave.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2021

Material Goals Towards Equity Along the STEM and LGBTQIA+ Spectra

Materials Science and Engineering (MSE) is an exciting interdisciplinary field that promises to secure an understanding of materials underpin technologies that enable modern life. We often champion the properties of the materials we study, we must remember that these advances are afforded by the people ‘behind’ the research and applications. This warrants us to consider the impact of our academic & industrial research climate, and whether there is equal access/support to participate. As such, this article focusses on disparities for members of the LGBTQIA+ (lesbian, gay, bisexual, transgender, queer, intersex, asexual, and more) community. Furthermore, we hope to support actions that create a more equitable community, where there is a sense of inclusion and belonging and power shared amongst LGBTQIA+ and non-LGBTQIA+ identifying individuals.

99 GENERAL AND MISCELLANEOUS↗