keyword
MENU ▼
Read by QxMD icon Read
search

Overpressure

keyword
https://www.readbyqxmd.com/read/28934237/identification-of-low-overpressure-interval-and-its-implication-to-hydrocarbon-migration-case-study-in-the-yanan-sag-of-the-qiongdongnan-basin-south-china-sea
#1
Qinghai Xu, Wanzhong Shi, Yuhong Xie, Zhenfeng Wang, Xusheng Li, Chuanxin Tong
The Qiongdongnan Basin is a strongly overpressured basin with the maximum pressure coefficient (the ratio of the actual pore pressure versus hydrostatic pressure at the same depth) over 2.27. However, there exists a widespread low-overpressure interval between the strong overpressure intervals in the Yanan Sag of western basin. The mechanisms of the low-overpressure interval are not well understood. Three main approaches, pore pressure test data and well-log analysis, pressure prediction based on the relationship between the deviation of the velocity and the pressure coefficients, and numerical modeling, were employed to illustrate the distribution and evolution of the low-overpressure interval...
2017: PloS One
https://www.readbyqxmd.com/read/28892384/kinetics-of-trifluoromethane-clathrate-hydrate-formation-from-chf3-gas-and-ice-particles
#2
Jaruwan Amtawong, Suvrajit Sengupta, Michael T Nguyen, Nicole C Carrejo, Jin Guo, Everly B Fleischer, Rachel W Martin, Kenneth C Janda
We report the formation kinetics of trifluoromethane clathrate hydrate (CH) from less than 75 μm diameter ice particles and CHF3 gas. As previously observed for difluoromethane and propane hydrate formation, the initial stages of the reaction exhibit a strong negative correlation of the reaction rate with temperature, consistent with a negative activation energy of formation. The values obtained for trifluoromethane, ca. -6 kJ/mol (H2O), are similar to those for difluoromethane, even though the two molecules have different intermolecular interactions and sizes...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28876906/water-issues-related-to-transitioning-from-conventional-to-unconventional-oil-production-in-the-permian-basin
#3
Bridget R Scanlon, Robert C Reedy, Frank Male, Mark Walsh
The Permian Basin is being transformed by the "shale revolution" from a major conventional play to the world's largest unconventional play, but water management is critical in this semiarid region. Here we explore evolving issues associated with produced water (PW) management and hydraulic fracturing water demands based on detailed well-by-well analyses. Our results show that although conventional wells produce ∼13 times more water than oil (PW to oil ratio, PWOR = 13), this produced water has been mostly injected back into pressure-depleted oil-producing reservoirs for enhanced oil recovery...
September 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28866319/the-effect-of-blast-overpressure-on-the-mechanical-properties-of-a-chinchilla-tympanic-membrane
#4
Junfeng Liang, Zachery A Yokell, Don U Nakmaili, Rong Z Gan, Hongbing Lu
The rupture of tympanic membrane (TM) has long been viewed as an indicator of blast injury, especially for hearing loss. However, little is known about damage to the TM caused by blast with pressure lower than the rupture threshold. In this paper, we present our study on the effect of blast overpressure on the static mechanical properties of TM. Chinchilla was used as the animal model and exposed to multiple blasts with pressures lower than the rupture threshold of the TM. Using a micro-fringe projection method, we observed the alteration of the static mechanical properties of post-blast chinchilla's TMs as compared to those of control TMs...
August 18, 2017: Hearing Research
https://www.readbyqxmd.com/read/28845448/nucleation-speed-limit-on-remote-fluid-induced-earthquakes
#5
Tom Parsons, Luca Malagnini, Aybige Akinci
Earthquakes triggered by other remote seismic events are explained as a response to long-traveling seismic waves that temporarily stress the crust. However, delays of hours or days after seismic waves pass through are reported by several studies, which are difficult to reconcile with the transient stresses imparted by seismic waves. We show that these delays are proportional to magnitude and that nucleation times are best fit to a fluid diffusion process if the governing rupture process involves unlocking a magnitude-dependent critical nucleation zone...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28827423/on-the-effective-stress-law-for-rock-on-rock-frictional-sliding-and-fault-slip-triggered-by-means-of-fluid-injection
#6
Ernest Rutter, Abigail Hackston
Fluid injection into rocks is increasingly used for energy extraction and for fluid wastes disposal, and can trigger/induce small- to medium-scale seismicity. Fluctuations in pore fluid pressure may also be associated with natural seismicity. The energy release in anthropogenically induced seismicity is sensitive to amount and pressure of fluid injected, through the way that seismic moment release is related to slipped area, and is strongly affected by the hydraulic conductance of the faulted rock mass. Bearing in mind the scaling issues that apply, fluid injection-driven fault motion can be studied on laboratory-sized samples...
September 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28810995/chondrocyte-viability-after-a-simulated-blast-exposure
#7
K Aaron Shaw, Peter C Johnson, David Williams, Steven D Zumbrun, Richard Topolski, Craig D Cameron
OBJECTIVES: The effects of blast exposure have gained increasing interest in the military medical community with their continued occurrence on the battlefield. The impact of the direct and indirect energy imparted from blasts to hollow viscera, as well as closed head injuries, have been well studied. However, the injury to articular cartilage has not been investigated, despite previous correlations regarding the development of osteoarthritis. The purpose of this study was to assess the degree of injury to articular chondrocytes after exposure to a simulated blast overpressure wave...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28763947/changes-in-sparkling-wine-aroma-during-the-second-fermentation-under-co2-pressure-in-sealed-bottle
#8
Rafael Martínez-García, Teresa García-Martínez, Anna Puig-Pujol, Juan Carlos Mauricio, Juan Moreno
High quality sparkling wine made by the traditional method requires a second alcoholic fermentation of a base wine in sealed bottles, followed by an aging time in contact with yeast lees. The CO2 overpressure released during this second fermentation has an important effect on the yeast metabolism and therefore on the wine aroma composition. This study focuses on the changes in chemical composition and 43 aroma compounds released by yeast during this fermentation carried out under two pressure conditions. The data were subjected to statistical analysis allowing differentiating between the base wine and the wine samples taken in the middle and at the end of fermentation...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28761137/a-4d-view-on-the-evolution-of-metamorphic-dehydration-reactions
#9
John Bedford, Florian Fusseis, Henri Leclère, John Wheeler, Daniel Faulkner
Metamorphic reactions influence the evolution of the Earth's crust in a range of tectonic settings. For example hydrous mineral dehydration in a subducting slab can produce fluid overpressures which may trigger seismicity. During reaction the mechanisms of chemical transport, including water expulsion, will dictate the rate of transformation and hence the evolution of physical properties such as fluid pressure. Despite the importance of such processes, direct observation of mineral changes due to chemical transport during metamorphism has been previously impossible both in nature and in experiment...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28755350/temporary-immersion-system-for-date-palm-micropropagation
#10
Ahmed Othmani, Chokri Bayoudh, Amel Sellemi, Noureddine Drira
The temporary immersion system (TIS) is being used with tremendous success for automation of micropropagation of many plant species. TIS usually consists of a culture vessel comprising two compartments, an upper one with the plant material and a lower one with the liquid culture medium and an automated air pump. The latter enables contact between all parts of the explants and the liquid medium by setting overpressure to the lower part of the container. These systems are providing the most satisfactory conditions for date palm regeneration via shoot organogenesis and allow a significant increase of multiplication rate (5...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28745648/fizzy-extraction-of-volatile-organic-compounds-combined-with-atmospheric-pressure-chemical-ionization-quadrupole-mass-spectrometry
#11
Hao-Chun Yang, Cheng-Hao Chang, Pawel L Urban
Chemical analysis of volatile and semivolatile compounds dissolved in liquid samples can be challenging. The dissolved components need to be brought to the gas phase, and efficiently transferred to a detection system. Fizzy extraction takes advantage of the effervescence phenomenon. First, a carrier gas (here, carbon dioxide) is dissolved in the sample by applying overpressure and stirring the sample. Second, the sample chamber is decompressed abruptly. Decompression leads to the formation of numerous carrier gas bubbles in the sample liquid...
July 14, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28741360/influence-of-chemical-mechanical-and-transport-processes-on-wellbore-leakage-from-geologic-co2-storage-reservoirs
#12
Susan A Carroll, Jaisree Iyer, Stuart D C Walsh
Wells are considered to be high-risk pathways for fluid leakage from geologic CO2 storage reservoirs, because breaches in this engineered system have the potential to connect the reservoir to groundwater resources and the atmosphere. Given these concerns, a few studies have assessed leakage risk by evaluating regulatory records, often self-reported, documenting leakage in gas fields. Leakage is thought to be governed largely by initial well-construction quality and the method of well abandonment. The geologic carbon storage community has raised further concerns because acidic fluids in the CO2 storage reservoir, alkaline cement meant to isolate the reservoir fluids from the overlying strata, and steel casings in wells are inherently reactive systems...
July 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28726571/primary-blast-causes-delayed-effects-without-cell-death-in-shell-encased-brain-cell-aggregates
#13
Thomas W Sawyer, David V Ritzel, Yushan Wang, Tyson Josey, Mercy Villanueva, Peggy Nelson, Yanfeng Song, Yimin Shei, Grant Hennes, Cory Vair, Steve Parks, Changyang Fan, Lori McLaws
Previous work in this laboratory used underwater explosive exposures to isolate the effects of shock-induced principle stress without shear on rat brain aggregate cultures. The current study has utilized simulated air blast to expose aggregates in suspension and enclosed within a spherical shell, enabling the examination of a much more complex biomechanical insult. Culture medium-filled spheres were exposed to single pulse overpressures of 15-30 psi (∼6-7 msec duration) and measurements within the sphere at defined sites showed complex and spatially dependent pressure changes...
September 14, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28713352/use-of-native-yeast-strains-for-in-bottle-fermentation-to-face-the-uniformity-in-sparkling-wine-production
#14
Ileana Vigentini, Shirley Barrera Cardenas, Federica Valdetara, Monica Faccincani, Carlo A Panont, Claudia Picozzi, Roberto Foschino
The in-bottle fermentation of sparkling wines is currently triggered by few commercialized Saccharomyces cerevisiae strains. This lack of diversity in tirage yeast cultures leads to a prevalent uniformity in sensory profiles of the end products. The aim of this study has been to exploit the natural multiplicity of yeast populations in order to introduce variability in sparkling wines throughout the re-fermentation step. A collection of 133 S. cerevisiae strains were screened on the basis of technological criteria (fermenting power and vigor, SO2 tolerance, alcohol tolerance, flocculence) and qualitative features (acetic acid, glycerol and H2S productions)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28709322/linearization-based-method-for-solving-a-multicomponent-diffusion-phase-field-model-with-arbitrary-solution-thermodynamics
#15
M J Welland, E Tenuta, A A Prudil
This article describes a phase-field model for an isothermal multicomponent, multiphase system which avoids implicit interfacial energy contributions by starting from a grand potential formulation. A method is developed for incorporating arbitrary forms of the equilibrium thermodynamic potentials in all phases to determine an explicit relationship between chemical potentials and species concentrations. The model incorporates variable densities between adjacent phases, defect migration, and dependence of internal pressure on object dimensions ranging from the macro- to nanoscale...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709260/pneumatic-fractures-in-confined-granular-media
#16
Fredrik K Eriksen, Renaud Toussaint, Antoine L Turquet, Knut J Måløy, Eirik G Flekkøy
We perform experiments where air is injected at a constant overpressure P_{in}, ranging from 5 to 250 kPa, into a dry granular medium confined within a horizontal linear Hele-Shaw cell. The setup allows us to explore compacted configurations by preventing decompaction at the outer boundary, i.e., the cell outlet has a semipermeable filter such that beads are stopped while air can pass. We study the emerging patterns and dynamic growth of channels in the granular media due to fluid flow, by analyzing images captured with a high speed camera (1000 images/s)...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28641233/large-eddy-simulation-and-experimental-study-on-vented-gasoline-air-mixture-explosions-in-a-semi-confined-obstructed-pipe
#17
Guoqing Li, Yang Du, Shimao Wang, Sheng Qi, Peili Zhang, Wenzhuo Chen
In this work, LES simulation coupled with a TFC sub-grid combustion model has been performed in a semi-confined pipe (L/D=10, V=10L) in the presence of four hollow-square obstacles (BR=49.8%) with circular hollow cross-section, in order to study the premixed gasoline-air mixture explosions. The comparisons between simulated results and experimental results have been conducted. It was found that the simulated results were in good agreement with experimental data in terms of flame structures, flame locations and overpressure time histories...
June 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28634733/dynamic-properties-of-human-tympanic-membrane-after-exposure-to-blast-waves
#18
Warren G Engles, Xuelin Wang, Rong Z Gan
Blast overpressure causes dynamic damage to middle ear components, and tympanic membrane (TM) rupture is the most frequent middle ear injury. However, it is unclear how the blast waves change mechanical properties of the TM and affect sound transmission through the ear. This paper reports the current study on dynamic properties of the TM after exposure to blast waves by using acoustic loading and laser Doppler vibrometry (LDV). The TM specimens were prepared from human temporal bones following exposures to blast overpressure...
June 20, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28634463/protective-effect-of-n-acetylcysteine-amide-on-blast-induced-increase-in-intracranial-pressure-in-rats
#19
Usmah Kawoos, Richard M McCarron, Mikulas Chavko
Blast-induced traumatic brain injury is associated with acute and possibly chronic elevation of intracranial pressure (ICP). The outcome after TBI is dependent on the progression of complex processes which are mediated by oxidative stress. So far, no effective pharmacological protection against TBI exists. In this study, rats were exposed to a single or repetitive blast overpressure (BOP) at moderate intensities of 72 or 110 kPa in a compressed air-driven shock tube. The degree and duration of the increase in ICP were proportional to the intensity and frequency of the blast exposure(s)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28630536/effects-of-filament-size-on-critical-current-density-in-overpressure-processed-bi-2212-round-wire
#20
Jianyi Jiang, Ashleigh Francis, Ryan Alicea, Maxime Matras, Fumitake Kametani, Ulf P Trociewitz, Eric E Hellstrom, David C Larbalestier
Bi2Sr2CaCu2Ox (Bi-2212) conductor is the only high temperature superconductor manufactured as a round wire and is a very promising conductor for very high field applications. One of the key design parameters of Bi-2212 wire is its filament size, which has been previously reported to affect the critical current density (Jc ) and ac losses. Work with 1 bar heat treatment showed that the optimal filament diameter was about 15 μm but it was not well understood at that time that gas bubbles were the main current limiting mechanism...
June 2017: IEEE Transactions on Applied Superconductivity: a Publication of the IEEE Superconductivity Committee
keyword
keyword
98261
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"