285,552 Works

Monument to Battle of Kursk

Children playing around the Monument to Battle of Kursk.

Auschwitz : Road Sign in Polish

Shell-Scarred Building

Photograph shows top portion of a damaged building against a blue sky.

Auschwitz II-Birkenau : Death Camp : Rail Lines Leading to Death Gate at Sunset : 02

Auschwitz II-Birkenau : Death Camp : Ruins of Temporary Gas Chambers from 1942

Auschwitz II-Birkenau : Death Camp : 02

Photograph shows a single building in the background, surrounded by chimney-like structures,all viewed through a wire fence.

Auschwitz II-Birkenau : Death Camp : Memorial Rose on Prisoners' Pallet in Barracks

Auschwitz II-Birkenau : Death Camp : Rail Lines Leading to Death Gate at Sunset : 01

Auschwitz II-Birkenau : Death Camp : Ruins of Crematorium V : 01

Auschwitz II-Birkenau : Death Camp : Processing Center : Looted Photos of Jewish Victims

Auschwitz II-Birkenau : Death Camp : Rail Spur Leading to Gas Chambers and Crematoria

Mesoscopic Stochastic Modeling: Diffusion Operators, Multiphysics Couplings, and Convergence

Stefan Engblom

Dynamical spatial models of signaling pathways underlying synaptic plasticity

Avrama Kim Blackwell

Random violence: A stochastic approach to cell cytotoxicity

Daniel Coombs

E-Cell System version 4.0: an integrated platform for single-particle-level

Kazunari Kaizu

Symmetric p-groups

Alice Niemeyer

Topological Quantum Computation

Nick Bonesteel
Certain exotic states of matter, so-called non-Abelian states, have the potential to provide a natural medium for the storage and manipulation of quantum information. In these states, localized particle-like excitations (quasiparticles) possess quantum numbers which are in many ways analogous to ordinary spin quantum numbers. However, unlike ordinary spins, the quantum information associated with these quantum numbers is stored globally, throughout the entire system, and so is intrinsically protected against decoherence. Quantum computation can then...

GUAP3 SCALE DISSOLVER AND SCALE SQUEEZE APPLICATION USING KINETIC HYDRATE INHIBITOR (KHI)

Len. W. Clark, Joanne Anderson, Neil Barr & Egbert Kremer
The use of Kinetic Hydrate Inhibitors (KHI) is one of the optimum methods employed to control gas hydrate formation issues and provide flow assurance in oil and gas production systems. The application of this technology has several advantages to operators, including significant cost savings and extended life of oil and gas systems. This paper will highlight a specific case where a Major operator in the North Sea (UK sector) significantly reduced the cost of well...

SEEDING HYDRATE FORMATION IN WATER-SATURATED SAND WITH DISSOLVED-PHASE METHANE OBTAINED FROM HYDRATE DISSOLUTION: A PROGRESS REPORT

W.F. Waite, J.P. Osegovic, W.J. Winters, M.D. Max & D.H. Mason
An isobaric flow loop added to the Gas Hydrate And Sediment Test Laboratory Instrument (GHASTLI) is being investigated as a means of rapidly forming methane hydrate in watersaturated sand from methane dissolved in water. Water circulates through a relatively warm source chamber, dissolving granular methane hydrate that was pre-made from seed ice, then enters a colder hydrate growth chamber where hydrate can precipitate in a water-saturated sand pack. Hydrate dissolution in the source chamber imparts...

MICROMECHANICAL ADHESION FORCE MEASUREMENTS BETWEEN CYCLOPENTANE HYDRATE PARTICLES

Laura E. Dieker, Craig J. Taylor, Carolyn A. Koh & E. Dendy Sloan
Cyclopentane hydrate interparticle adhesion force measurements were performed in pure cyclopentane liquid using a micromechanical force apparatus. Cyclopentane hydrate adhesion force measurements were compared to those of cyclic ethers, tetrahydrofuran and ethylene oxide, which were suspected to be cyclic ether-lean and thus contain a second ice phase. This additional ice phase led to an over-prediction of the hydrate interparticle forces by the capillary bridge theory. The adhesion forces obtained for cyclopentane hydrate at atmospheric pressure...

EFFECT OF CHANGES IN SEAFLOOR TEMPERATURE AND SEA-LEVEL ON GAS HYDRATE STABILITY

John W. Pritchett & Sabodh K. Garg
We have developed a one-dimensional numerical computer model (simulator) to describe methane hydrate formation, decomposition, reformation, and distribution with depth below the seafloor in the marine environment. The simulator was used to model hydrate distributions at Blake Ridge (Site 997) and Hydrate Ridge (Site 1249). The numerical models for the two sites were conditioned by matching the sulfate, chlorinity, and hydrate distribution measurements. The constrained models were then used to investigate the effect of changes...

SEAWATER DESALINATION AS A BENEFICIAL FACTOR OF CO2 SEQUESTRATION.

M.D. Max, K. Sheps, S.R. Tatro, L. Brazel & J.P. Osegovic
It is becoming increasingly recognized that the flood of anthropogenic CO2 into the atmosphere should be reduced in order to mitigate the Earth’s atmospheric greenhouse and slow climate change. If immediate action is required, then a number of greenhouse gas reduction strategies may need to be implemented even before complete study of their impacts can be fully understood. Energy production through combustion produces large amounts of CO2 in a relatively small number of locations at...

PALEO HYDRATE AND ITS ROLE IN DEEP WATER PLIO-PLEISTOCENE GAS RESERVOIRS IN KRISHNA-GODAVARI BASIN, INDIA

Nishikanta Kundu, Nabarun Pal, Neeraj Sinha & IL Budhiraja
Discovery of natural methane hydrate in deepwater sediments in the east-coast of India have generated significant interest in recent times. This work puts forward a possible relationship of multi-TCF gas accumulation through destabilization of paleo-hydrate in Plio-Pleistocene deepwater channel sands of Krishna-Godavari basin, India. Analysis of gas in the study area establishes its biogenic nature, accumulation of which is difficult to explain using the elements of conventional petroleum system. Gas generated in sediments by methanogenesis...

INVESTIGATION OF THE HYDROGEN STORAGE CAPACITY OF HYDRATES WITH MONTE CARLO SIMULATIONS

Nikolaos I. Papadimitriou, Ioannis N. Tsimpanogiannis, Athanassios K. Stubos & Cor J. Peters
In the present work Grand Canonical Monte Carlo simulations are implemented in order to evaluate the hydrogen storage capacity of hydrates under a wide range of conditions. Hydrates of sII and sH type with or without promoter have been examined. Concerning hydrates of pure H2, our results show that sII hydrates can store up to 3.3 wt. % H2 and sH up to 3.6 wt. % in the pressure range examined (up to 500 MPa)....

THE EFFECT OF SURFACTANT ON THE MORPHOLOGY OF METHANE/PROPANE CLATHRATE HYDRATE CRYSTALS.

Jeffry Yoslim & Peter Englezos
In the present study the effect of one commercially available anionic surfactant on the formation/dissociation of hydrate from a gas mixture of 90.5 % methane – 9.5% propane mixture was investigated. Surfactants are known to increase gas hydrate formation rate. Memory water was used and the experiments were carried out at three different degrees of undercooling and two different surfactant concentrations. In addition, the effect of the surfactant on storage capacity of gas into hydrate...

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