New method for determining the chemical potential for condensed matter at high density

1994 ◽  
Vol 101 (9) ◽  
pp. 7804-7810 ◽  
Author(s):  
J. G. Powles ◽  
B. Holtz ◽  
W. A. B. Evans
Keyword(s):  
Chemical Potential ◽  
Condensed Matter ◽  
High Density ◽  
New Method

A new method for the fractionation of human plasma high density lipoprotein

1977 ◽  
Vol 55 (7) ◽  
pp. 766-768 ◽  
Author(s):  
Bernard Rubenstein ◽  
Susan Evans ◽  
George Steiner
Keyword(s):  
High Density Lipoprotein ◽  
Human Plasma ◽  
Density Lipoprotein ◽  
High Density ◽  
New Method ◽  
Continuous Gradient ◽  
Elution Pattern ◽  
Plasma High Density Lipoprotein ◽  
Plasma High Density ◽  
Peptide Composition

We have devised a new method for the fractionation of human plasma high density lipoprotein (HDL). The HDL was chromatographed on DEAE-agarose columns using a continuous gradient of 0.06–0.15 M NaCl. The elution pattern obtained showed three phases, each with differing peptide composition. Examination of the three subfractions showed that each contained both apo A-I and apo A-II, but indifferent proportions. Subfraction 1 contained noapoC-II orC-III-1 and only a trace of apo C-III-2, subfraction 2 contained apo C-II and C-III-1 but no C-III-2, while subfraction 3 contained considerable apo C-III-2 with only traces of apo C-II or C-III-1.

scholarly journals Influence of nanocellulose on the hydration process of Portland cement and concrete properties

2020 ◽  
Vol 17 (5) ◽  
pp. 155-160
Author(s):  
V. I. Khirkhasova ◽  
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Physical And Mechanical Properties ◽  
Cement Composite ◽  
High Density ◽  
Strength Characteristics ◽  
New Method ◽  
Concrete Properties ◽  
Hardening Process ◽  
Study Results

The paper deals with modification of cement composite and concrete with nanocellulose in low and high density. The author presents the study results of the influence of nanocellulose on the cement composite hardening process, as well as the physical and mechanical properties of heavy concrete. The influence of the used additive on the rheological and strength characteristics of concrete is revealed. A new method is proposed to improve the material performance.

scholarly journals Spin polarizations under a pseudovector interaction between quarks with the Kobayashi–Maskawa–’t Hooft term in high density quark matter

2020 ◽  
Vol 29 (01) ◽  
pp. 2050003 ◽  
Author(s):  
Masatoshi Morimoto ◽  
Yasuhiko Tsue ◽  
João da Providência ◽  
Constança Providência ◽  
Masatoshi Yamamura
Keyword(s):  
Spin Polarization ◽  
Quark Matter ◽  
Strange Quark ◽  
Chemical Potential ◽  
High Density ◽  
Quark Spin ◽  
Flavor Mixing ◽  
Small Chemical

A possibility of a quark spin polarization originating from a pseudovector condensate is investigated in the three-flavor Nambu–Jona–Lasinio model with the Kobayashi–Maskawa–’t Hooft interaction which leads to flavor mixing. It is shown that a pseudovector condensate related to the strange quark easily occurs compared with pseudovector condensate related to light quarks. Further, it is shown that the pseudovector condensate related to the strange quark appears at a slightly small chemical potential by the effect of the flavor mixing due to the Kobayashi–Maskawa–’t Hooft interaction.

scholarly journals SURPRISES IN NONPERTURBATIVE DYNAMICS IN σ-MODEL AT FINITE DENSITY

2004 ◽  
Vol 19 (18) ◽  
pp. 1341-1356 ◽  
Author(s):  
V. P. GUSYNIN ◽  
V. A. MIRANSKY ◽  
I. A. SHOVKOVY
Keyword(s):  
Elementary Particle ◽  
Field Theory ◽  
Quantum Field Theory ◽  
Particle Physics ◽  
Chemical Potential ◽  
High Density ◽  
Quantum Field ◽  
Finite Density ◽  
Elementary Particle Physics ◽  
Kaon Condensate

The linear SU (2)L× SU (2)R σ-model occupies a unique place in elementary particle physics and quantum field theory. It has been recently realized that when a chemical potential for hypercharge is added, it becomes a toy model for the description of the dynamics of the kaon condensate in high density QCD. We review recent results in nonperturbative dynamics obtained in the ungauged and gauged versions of this model.

A new method to measure the signal quality for high-density recording systems

2004 ◽  
Author(s):  
Eing-Seob Cho ◽  
Jae-Wook Lee ◽  
Junghyun Lee ◽  
Eun-Jin Ryu ◽  
Maxim Konakov ◽  
...  
Keyword(s):  
High Density ◽  
New Method ◽  
Signal Quality ◽  
High Density Recording

scholarly journals New method for numerically solving the chemical potential dependence of the dressed quark propagator

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Feng-yao Hou ◽  
Lei Chang ◽  
Wei-min Sun ◽  
Hong-shi Zong ◽  
Yu-xin Liu
Keyword(s):  
Chemical Potential ◽  
Quark Propagator ◽  
New Method ◽  
Potential Dependence

Hot Impact Densification: A New Method for Producing High Density Ceramic Pellets with Close Shape Tolerances

1982 ◽  
Vol 58 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Milan Hrovat ◽  
Hans Huschka ◽  
Lothar Rachor ◽  
Günter Mühling ◽  
Heinz Zimmerman
Keyword(s):  
High Density ◽  
New Method

The Successful Development, Validation, and First Use of an Innovative Zinc-Free, High-Density Completion Fluid for Deepwater

2021 ◽  
Author(s):  
Samy A. Helmy ◽  
Judith K. Guy-Caffey ◽  
Leroy J. Detiveaux ◽  
Sabine C. Zeilinger ◽  
Mike D. Barry ◽  
...  
Keyword(s):  
Produced Water ◽  
Laboratory Data ◽  
High Volume ◽  
High Density ◽  
New Method ◽  
Control Line ◽  
Priority Pollutants ◽  
Chemical Additives ◽  
Worst Case ◽  
Carbon Dioxide Co2

Abstract The completion of wells using solids-laden fluids can impair the reservoir production and also damage the functioning of downhole completion tools, therefore completing wells with clear-brine fluids is the preferred alternative. Clear brines are typically halide or formate salt solutions in water, but they, too, have shortcomings. At lower temperatures or increased pressures, the salts in these fluids can crystallize causing potential well control concerns and/or costly operational disruptions. Completion of high-pressure wells, with densities above approximately 14.3 lb/gal for calcium bromide or 13.1 lb/gal for potassium formate, has historically required the use of brines containing zinc bromide or cesium formate to minimize formation damage, yet, in addition to their merits,both fluids have inherent liabilities. Zinc-based fluids, for example, are restricted and classified as priority pollutants due to their potential harmful effects on the environment, and the low pH(acidity) of zinc-based halides increases the potential for corrosion of metal components and risk to personnel safety. With cesium formate fluids, their limited production may restrict supply and lead to higher cost in high-volume deepwater applications. Moreover, when used as a packer fluid, literature (Javora 2003) suggests that formates may cause hydrogen-induced cracking (HIC), especially in the presence of carbon dioxide (CO2) that could lead to failure of production tubing. An offshore operator required a priority-pollutant-free completion fluid for a subsea development,whose produced fluids (oil and water) are combined and processed with that from several other fields at a shared production facility. Associated produced water separated from the crude is dischargedoverboard and must be free of priority pollutants; detection of any such pollutants would requireextensive processing or, in the worst case, result in shutting down production from all the fields and the facility. This paper describes the development and successful field applications of a novel family of completion fluids, created to address the deficits of conventional high-density clear brines. The new fluids extend the conditions for onset of crystallization to a higher density range and meet environmental concerns, as they are formulated with sustainably sourced materials. The novel high-density,non-zinc, solids-free completion fluid (HDNZ) meets the challenges and requirements of ultra-deepwater environments for fluid densities between 14.4 and 15.3 lb/gal. An overview of the extensive laboratory test data needed to develop the fluid and verify its viability as a completion brine and packer fluid is described. The paper outlines the design criteria and qualification testing performedto ensure that the technical challenges were addressed for this challenging deepwater project. The laboratory data include testing of pressurized crystallization temperatures (PCTs), stress corrosion cracking (SCC), elastomer compatibility, formation regain permeability, long-term stability, and compatibility with multiple fluid types (mud, control line, spacer, frac fluids, sour gases and chemical additives). The discussion on fluid usage will encompass details of the plant trial to validate the performance of the fluid and case history detailing the operational implementation in the first five ultra-deepwater well completions in the GOM. Additionally, engineering these fluids led to the development of a new method to measure brine crystallization temperature at elevated pressures, as there currently is no industry standard for such measurement in downhole conditions. The new method is accurate, repeatable, and executable in rig-site laboratories.

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