1,421 research outputs found
Space shuttle high pressure auxiliary propulsion subsystem definition study Summary report
Space shuttle high pressure hydrogen oxygen auxiliary propulsion subsystem conceptual and design study summar
Timescales for the development of methanogenesis and free gas layers in recently-deposited sediments of Arkona Basin (Baltic Sea)
Arkona Basin (southwestern Baltic Sea) is a
seasonally-hypoxic basin characterized by the presence of
free methane gas in its youngest organic-rich muddy stratum.
Through the use of reactive transport models, this
study tracks the development of the methane geochemistry
in Arkona Basin as this muddy sediment became deposited
during the last 8 kyr. Four cores are modeled each pertaining
to a unique geochemical scenario according to their respective
contemporary geochemical profiles. Ultimately the
thickness of the muddy sediment and the flux of particulate
organic carbon are crucial in determining the advent of
both methanogenesis and free methane gas, the timescales
over which methanogenesis takes over as a dominant reaction
pathway for organic matter degradation, and the timescales
required for free methane gas to form
Condition-Based Maintenance Implementation and Potential in USMC Ground Transport
NPS NRP Technical ReportCondition-Based Maintenance (CBM) has been successfully implemented in private-sector operations to reduce maintenance costs and asset downtime. USMC is currently transitioning to a CBM+ approach to maintenance, addressing its unique organizational and operating environment. This project identifies private-sector best practices and lessons learned most applicable to USMC as well as important hurdles for USMC adoption. It identifies maintenance and readiness metrics changes that may be relevant in future USMC and joint sustainment operations, taking into account both CBM and maintenance in an expeditionary environment.HQMC Installations and Logistics (I&L)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.
Condition-Based Maintenance Implementation and Potential in USMC Ground Transport
NPS NRP Project PosterCondition-Based Maintenance (CBM) has been successfully implemented in private-sector operations to reduce maintenance costs and asset downtime. USMC is currently transitioning to a CBM+ approach to maintenance, addressing its unique organizational and operating environment. This project identifies private-sector best practices and lessons learned most applicable to USMC as well as important hurdles for USMC adoption. It identifies maintenance and readiness metrics changes that may be relevant in future USMC and joint sustainment operations, taking into account both CBM and maintenance in an expeditionary environment.HQMC Installations and Logistics (I&L)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.
Condition-Based Maintenance Implementation and Potential in USMC Ground Transport
NPS NRP Executive SummaryCondition-Based Maintenance (CBM) has been successfully implemented in private-sector operations to reduce maintenance costs and asset downtime. USMC is currently transitioning to a CBM+ approach to maintenance, addressing its unique organizational and operating environment. This project identifies private-sector best practices and lessons learned most applicable to USMC as well as important hurdles for USMC adoption. It identifies maintenance and readiness metrics changes that may be relevant in future USMC and joint sustainment operations, taking into account both CBM and maintenance in an expeditionary environment.HQMC Installations and Logistics (I&L)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.
PSS34 Cost-Effectiveness of Ranibizumab Verse Aflibercept in Treatment of Treatment of Visual Impairment Due to Diabetic Macular Oedema (Dmo)
Continental shelves as a variable but increasing global sink for atmospheric carbon dioxide
It has been speculated that the partial pressure of carbon dioxide (pCO2) in shelf waters may lag the rise in atmospheric CO2. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO2. This result is based on analysis of long-term trends in the airâsea pCO2 gradient (ÎpCO2) using a global surface ocean pCO2 database spanning a period of up to 35 years. Using wintertime data only, we find that ÎpCO2 increased in 653 of the 825 0.5° cells for which a trend could be calculated, with 325 of these cells showing a significant increase in excess of +0.5âÎŒatmâyrâ1 (pâ2 during the last century
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A Stochastic Multiscale Model of Cardiac Thin Filament Activation Using Brownian-Langevin Dynamics.
We use Brownian-Langevin dynamics principles to derive a coarse-graining multiscale myofilament model that can describe the thin-filament activation process during contraction. The model links atomistic molecular simulations of protein-protein interactions in the thin-filament regulatory unit to sarcomere-level activation dynamics. We first calculate the molecular interaction energy between tropomyosin and actin surface using Brownian dynamics simulations. This energy profile is then generalized to account for the observed tropomyosin transitions between its regulatory stable states. The generalized energy landscape then served as a basis for developing a filament-scale model using Langevin dynamics. This integrated analysis, spanning molecular to thin-filament scales, is capable of tracking the events of the tropomyosin conformational changes as it moves over the actin surface. The tropomyosin coil with flexible overlap regions between adjacent tropomyosins is represented in the model as a system of coupled stochastic ordinary differential equations. The proposed multiscale approach provides a more detailed molecular connection between tropomyosin dynamics, the trompomyosin-actin interaction-energy landscape, and the generated force by the sarcomere
In situ generation of coronal Alfvén waves by jets
Within the framework of 3D resistive magnetohydrodynamic, we simulate the formation of a plasma jet with the morphology, upward velocity up to 130 kmâsâ1, and time-scale formation between 60 and 90 s after beginning of simulation, similar to those expected for type II spicules. Initial results of this simulation were published in paper by, e.g. GonzĂĄlez-AvilĂ©s et al. (2018), and present paper is devoted to the analysis of transverse displacements and rotational-type motion of the jet. Our results suggest that 3D magnetic reconnection may be responsible for the formation of the jet in paper by GonzĂĄlez-AvilĂ©s et al. (2018). In this paper, by calculating times series of the velocity components vx and vy in different points near to the jet for various heights we find transverse oscillations in agreement with spicule observations. We also obtain a time-distance plot of the temperature in a cross-cut at the plane x =â0.1 Mm and find significant transverse displacements of the jet. By analysing temperature isosurfaces of 104 K with the distribution of vx, we find that if the line-of-sight (LOS) is approximately perpendicular to the jet axis then there is both motion towards and away from the observer across the width of the jet. This redâblue shift pattern of the jet is caused by rotational motion, initially clockwise and anti-clockwise afterwards, which could be interpreted as torsional motion and may generate torsional AlfvĂ©n waves in the corona region. From a nearly vertical perspective of the jet the LOS velocity component shows a central blue-shift region surrounded by red-shifted plasma
PSS25 Cost Effectiveness Analysis of Ranibizumab Compared to Aflibercept and Laser Intervention In Treatment of Diabetic Macular Edema (Dme) In The Czech Republic
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