ENVIROSAT-2000 report: Federal agency satellite requirements

The requirement of Federal agencies, other than NOAA, for the data and services of civil operational environmental satellites (both polar orbiting and geostationary) are summarized. Agency plans for taking advantage of proposed future Earth sensing space systems, domestic and foreign, are cited also. Current data uses and future requirements are addressed as identified by each agency

The Impact of Female Leadership in Collegial Courts on Time to Render Merits Decisions: Evidence from the Norwegian Supreme Court

What is the effect of gender on the deliberative process of judging? Drawing on previous research on female leaders’ inclination to foster a more inclusive and collaborative decision-making process, we argue that decision making takes more time in a collegial court when female justices preside over decisional panels. Analyzing an original data set on cases decided by the Norwegian Supreme Court between 2008 and 2019, we find that when a woman is the presiding justice, the duration of case disposition time increases. This effect, however, persists for only eight days. Our finding suggests that institutional practices take effect over gendered effects.publishedVersio

Thermal decomposition of ternary sodium graphite intercalation compounds

Graphite intercalation compounds (GICs) are often used to produce exfoliated or functionalised graphene related materials (GRMs) in a specific solvent. This study explores the formation of the Na-tetrahydrofuran (THF)-GIC and a new ternary system based on dimethylacetamide (DMAc). Detailed comparisons of in situ temperature dependent XRD with TGA-MS and Raman measurements reveal a series of dynamic transformations during heating. Surprisingly, the bulk of the intercalation compound is stable under ambient conditions, trapped between the graphene sheets. The heating process drives a reorganisation of the solvent and Na molecules, then an evaporation of the solvent; however, the solvent loss is arrested by restacking of the graphene layers, leading to trapped solvent bubbles. Eventually, the bubbles rupture, releasing the remaining solvent and creating expanded graphite. These trapped dopants may provide useful property enhancements, but also potentially confound measurements of grafting efficiency in liquid-phase covalent functionalization experiments on 2D materials

Irreversibility and Polymer Adsorption

Physisorption or chemisorption from dilute polymer solutions often entails irreversible polymer-surface bonding. We present a theory of the non-equilibrium layers which result. While the density profile and loop distribution are the same as for equilibrium layers, the final layer comprises a tightly bound inner part plus an outer part whose chains make only fN surface contacts where N is chain length. The contact fractions f follow a broad distribution, P(f) ~ f^{-4/5}, in rather close agreement with strong physisorption experiments [H. M. Schneider et al, Langmuir v.12, p.994 (1996)].Comment: 4 pages, submitted to Phys. Rev. Let

Speed and Surface Speed and Magnitude of Knee Adduction

Frontal plane knee biomechanics, in particular speed and magnitude of knee adduction motion, are implicated in knee osteoarthritis development. Although individuals are between 50% to 90% more likely to develop knee osteoarthritis after anterior cruciate ligament reconstruction (ACL-R), it is unknown if ACL-R individuals exhibit knee adduction biomechanics related to OA development. This study sought to quantify speed and magnitude of knee adduction for knee OA and ACL-R individuals. We hypothesize that OA will exhibit larger, faster knee adduction biomechanics than ACL-R, which will increase at great walk speed and over a challenging surface. Six individuals with ACL-R and 8 individuals with knee OA had knee adduction quantified as they walked 1.3 m/s and at a self-selected speed over a flat and an uneven surface. Peak of stance, and average and maximum velocity of knee adduction joint angle and moment between heel strike and peak of stance were submitted to repeated measures ANOVA to compare main and interaction effects between group, speed and surface. There was a walk speed by group interaction for peak knee adduction moment (p = 0.048). Walk speed impacted maximum knee adduction joint angle (p=0.004) and moment velocity (p=0.041), while surface impacted peak knee adduction joint angle (p=0.035) and maximum knee adduction joint moment velocity (p=0.007). In partial agreement with our hypothesis, speed and magnitude knee adduction biomechanics increased with walk speed and surface, but OA did not consistently exhibit larger knee adduction biomechanics than ACL-R

Grafting from versus Grafting to Approaches for the Functionalization of Graphene Nanoplatelets with Poly(methyl methacrylate)

Graphene nanoplatelets (GNP) were exfoliated using a nondestructive chemical reduction method and subsequently decorated with polymers using two different approaches: grafting from and grafting to. Poly(methyl methacrylate) (PMMA) with varying molecular weights was covalently attached to the GNP layers using both methods. The grafting ratios were higher (44.6% to 126.5%) for the grafting from approach compared to the grafting to approach (12.6% to 20.3%). The products were characterized using thermogravimetric analysis–mass spectrometry (TGA-MS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The grafting from products showed an increase in the grafting ratio and dispersibility in acetone with increasing monomer supply; on the other hand, due to steric effects, the grafting to products showed lower absolute grafting ratios and a decreasing trend with increasing polymer molecular weight. The excellent dispersibility of the grafting from functionalized graphene, 900 μg/mL in acetone, indicates an increased compatibility with the solvent and the potential to increase graphene reinforcement performance in nanocomposite applications