Filament wound container Patent

Development of foam insulation for filament wound cryogenic storage tan

A new method for fabrication of flexible vacuum purge jackets

Polyurethane-coated synthetic fabric is fitted with a filament-glass mat exterior which gives it a high degree of springback ability. Material is capable of maintaining its springback capability in a temperature range from ambient to cryogenic

Method of making a filament-wound container Patent

Fabrication of filament wound propellant tank for cryogenic storag

Design and fabrication of an internally insulated filament wound liquid hydrogen propellant tank

Internally insulated filament wound liquid hydrogen propellant tank

Investigation of fabrication and processing parameters associated with use of polyurethane foams in sealed cryogenic insulation Final report

Fabrication and processing of polyurethane foams and vapor barrier foam seal material for sealed cryogenic insulation

Aryl Ethers from Arenediazonium Tetrafluoroborate Salts: from Neat Reactions to Solvent-mediated Effects

A general procedure for the synthesis of various aryl ethers via the thermal decomposition of benzenediazonium tetrafluoroborate salts is described. Studies performed in neat alcohol at 60°C gave aryl ethers in yields ranging from 0-73%. Upon completion of a series of reactions, the effect of solvent was explored to expand the scope and relevance of this procedure. It was found that even solvents that are traditionally non-nucleophilic gave rise to products including bi-aryls and N-aryl acetamides. The utilization of an ionic liquid, l-butyl-4-methylpyridinium tetrafluoroborate, resulted in yields comparable to reactions performed in neat alcoholic solvents

Uridine-derived ribose fuels glucose-restricted pancreatic cancer

Pancreatic ductal adenocarcinoma (PDA) is a lethal disease notoriously resistant to therap

Imidazolyl Alanes - Synthesis, Structures, and Reactivity Studies – Imidazolyl Alanes - Synthesis, Structures, and Reactivity Studies

Targeting the synthesis of Al/C based ambiphilic molecules, we investigated the dehydrohalogenation of a series of (benz)imidazole alane adducts. Depending on the steric bulk of the heterocycle, different dimeric products with various ring sizes were obtained. Dehydrohalogenation of the adduct of 1‐mesityl imidazole ($^{Mes}$Im) and 0.5 [tBu$_{2}$AlBr]$_{2}$ furnished the dimer 2, featuring a “classical” N‐heterocyclic carbene (NHC) and a mesoionic or “abnormal” NHC (aNHC) subunit within a single molecule. The dimer is bound loosely enough to allow thermally induced isomerization of 2 into the isomers 2$^{NHC}$ (all NHC) and 2$^{aNHC}$ (all aNHC). Dehydrohalogenation of the adduct of 1‐mesityl‐2‐methyl imidazole ($^{Mes}$Im$^{Me}$) and 0.5 [tBu$_{2}$AlBr]$_{2}$ (4) yielded the dimeric compound 5 consisting of two N‐heterocyclic olefin (NHO) subunits. Although these six‐ and eight‐membered heterocycles show no FLP‐type reactivity towards small molecules like H$_{2}$, CO or CO$_{2}$, we observed an ambiphilic behavior of the imidazolyl alanes during our studies. Salt metathesis reactions using $^{Mes}$Im resulted in the formation of 3, which can be viewed as tBu$_{2}$AlBr adduct of an Al/N ambiphile. Utilizing heterocycles such as benzimidazole or spiroindole provided the entry point to C–H (7, 9) and N–H (10) activation products, most likely resulting from a reactivity of intermediate species as Al/C ambiphiles

Toward Realistic Nonstationarity of Semidiurnal Baroclinic Tides in a Hydrodynamic Model

Semidiurnal baroclinic tide sea surface height (SSH) variance and semidiurnal nonstationary variance fraction (SNVF) are compared between a hydrodynamic model and altimetry for the low‐ to middle‐latitude global ocean. Tidal frequencies are aliased by ∼10‐day altimeter sampling, which makes it impossible to unambiguously identify nonstationary tidal signals from the observations. In order to better understand altimeter sampling artifacts, the model was analyzed using its native hourly outputs and by subsampling it in the same manner as altimeters. Different estimates of the semidiurnal nonstationary and total SSH variance are obtained with the model depending on whether they are identified in the frequency domain or wave number domain and depending on the temporal sampling of the model output. Five sources of ambiguity in the interpretation of the altimetry are identified and briefly discussed. When the model and altimetry are analyzed in the same manner, they display qualitatively similar spatial patterns of semidiurnal baroclinic tides. The SNVF typically correlates above 80% at all latitudes between the different analysis methods and above 60% between the model and altimetry. The choice of analysis methodology was found to have a profound effect on estimates of the semidiurnal baroclinic SSH variance with the wave number domain methodology underestimating the semidiurnal nonstationary and total SSH variances by 68% and 66%, respectively. These results produce a SNVF estimate from altimetry that is biased low by a factor of 0.92. This bias is primarily a consequence of the ambiguity in the separation of tidal and mesoscale signals in the wave number domain.Key PointsHydrodynamic models incorporating mesoscale dynamics and tides are beginning to resolve stationary and nonstationary baroclinic tidesThe ratio of nonstationary to total semidiurnal variance computed from altimetry and HyCOM simulations agrees at low and middle latitudesComparisons of analysis methodologies show that total and nonstationary semidiurnal variances are underestimated in altimetry on averagePeer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/152034/1/jgrc23624_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/152034/2/jgrc23624.pd