An Integrated Geophysical Approach for a Karst Characterization of the Marshall Space Flight Center

2005 ◽  
Author(s):  
Lynn Yuhr ◽  
Ronald Kaufmann ◽  
Michael Singer ◽  
Bill McElroy ◽  
Jason Glasgow
Keyword(s):  
Space Flight

scholarly journals CHARACTERIZATION OF BIDIRECTIONAL TRANSMISSIVE AND REFLECTIVE PROPERTIES OF BLACK SILICON

2022 ◽  
Vol 2149 (1) ◽  
pp. 012012
Author(s):  
Georgi T. Georgiev ◽  
James J. Butler ◽  
Ron Shiri ◽  
Christine A. Jhabvala
Keyword(s):  
Space Flight ◽  
Specular Reflection ◽  
Black Silicon ◽  
Silicon Sample ◽  
Low Level ◽  
Goddard Space ◽  
Hemispherical Reflectance ◽  
Goddard Space Flight Center ◽  
Initial Work

Abstract This paper describes the initial work of characterizing the transmissive and reflective properties of black silicon diffusers. The diffusers were fabricated from a 100 mm diameter black silicon sample at NASA’s Goddard Space Flight Center (GSFC). The directional hemispherical reflectance from 250 nm to 2500 nm and BRDF/BTDF measurements at 632.8 nm, 1064 nm, and 1550 nm were measured using the GSFC Diffuser Calibration Laboratory’s (DCL) spectrophotometer and optical scatterometer. The diffusers exhibit a low level of specular reflection up to ~1100 nm with no evidence of retroscatter. The measurements are traceable to those made at the National Institute of Standards and Technology (NIST).

Material Characterization of Additively Manufactured Ti-6Al-4V Parts for an Environmental Control and Life Support System in Space Flight Hardware

2020 ◽  
Vol 9 (5) ◽  
pp. 20190239
Author(s):  
Christopher Roberts ◽  
Preston McGill ◽  
Larry Foreman ◽  
Matthew Roberts ◽  
Ellen Rabenberg ◽  
...  
Keyword(s):  
Support System ◽  
Space Flight ◽  
Material Characterization ◽  
Life Support ◽  
Environmental Control ◽  
Life Support System ◽  
Flight Hardware

Karst Characterization of the Marshall Space Flight Center: Two Years Later

2008 ◽  
Author(s):  
Lynn Yuhr ◽  
Ronald Kaufmann ◽  
Dan Casto ◽  
Michael Singer ◽  
Bill McElroy ◽  
...  
Keyword(s):  
Space Flight

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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