Concentration polarization

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  • Two psycholinguistic and psychophysical experiments show that in order to efficiently extract polarity of written texts such as customerreviews on the Internet, one should concentrate computational efforts on messages in the final position of the text.

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  • This text is written to all chemical engineering students who are participating in courses about membrane processes and membrane technology. You are supposed to have the basic skills in mathematics and chemistry in general. Thus, this text is for students who have completed the basic engineering introduction courses. This text gives an introduction to principles behind pressure driven membrane processes. Relevant theory and models will be presented together with terms widely used in the world of membrane technology. ...

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  • Crack semilength Area Diameter Force or load Second moment of area Second polar moment of area Stress-intensity factor Stress-concentration factor for static loading Critical-stress-intensity factor Normal-stress-concentration factor Shear-stress-concentration factor Moment Design factor Sensitivity index

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  • NOMENCLATURE a A b C0 C1, C2 d di E F g / 7 / k K Kf € Distance Area Distance Constant Constants Outside diameter of shaft Inside diameter of hollow shaft Modulus of elasticity Load Gravitation constant index Second moment of area Polar second area moment Torsional spring rate Transverse shear stress magnification factor Fatigue stress concentration factor Span

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  • Voltammetry techniques measure current as a function of applied potential under conditions that promote polarization of a working electrode. Polarography: Invented by J. Heyrovsky (Nobel Prize 1959). Differs from voltammetry in that it employs a dropping mercury electrode (DME) to continuously renew the electrode surface. Amperometry: current proportional to analyte concentration is monitored at a fixed potential

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  • CHAPTER 12 STRENGTH UNDER STATIC CIRCUMSTANCES Charles R. Mischke, Ph.D., RE. Professor Emeritus of Mechanical Engineering Iowa State University Ames, Iowa Joseph E. Shigley Professor Emeritus The University of Michigan Ann Arbor, Michigan 12.1 PERMISSIBLE STRESSES AND STRAINS / 12.2 12.2 THEORY OF STATIC FAILURE / 12.3 12.3 STRESS CONCENTRATION / 12.7 12.4 FRACTURE MECHANICS / 12.11 12.5 NONFERROUS METALS / 12.17 12.6 STOCHASTIC CONSIDERATIONS / 12.20 REFERENCES / 12.

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  • Phospholipids are known to influence fibril formation of amyloid beta (Ab) peptide. Here, we show that lysophosphatidylcholine (LPC), a polar phos-pholipid, enhances Ab(1-42) fibril formation, by decreasing the lag time and the critical peptide concentration required for fibril formation, and increasing the fibril elongation rate.

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  • The X-ray structure of mistletoe lectin I (MLI), a type-II ribosome-inactivatingprotein (RIP), cocrystallized with galactose is described. The model was refined at 3.0 A ˚ resolution to an R-factor of 19.9% using21 899 reflections, with Rfree 24.0%. MLI forms a homodimer (A–B)2in the crystal, as it does in solution at high concentration. The dimer is formed through contacts between the N-terminal domains of two B-chains involvingweak polar and non-polar interactions.

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  • Corrosion inhibition of organic clay nanofil5 in NaCl 0.1 M solution was studied by polarization curves and electrochemical impedance spectroscopy. The clay concentrations studied were between 1 g/l and 5 g/l. The clay nanofil5 plays both anodic and cathodic corrosion inhibition. The corrosion inhibition of clay nanofil5 depends on the concentration. The results obtained by two methods were in good agreement and showed that the highest inhibition efficiency was obtained with the nanofil5 concentration of 3 g/l.

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  • Effect of sodium nitrite on the carbon steel corrosion inhibition in the aerated neutral (pH 7) and alkaline (pH 11) water solutions at temperatures from 30o C to 140o C has been investigated by mass loss, potentiodynamic polarization and electrochemical impedance spectroscopy methods. Sodium nitrite was added in concentrations: 200, 350, 500, 750, 1000, 1500 and 2000 ppm by mass.

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  • This chapter describes the structure of the water molecule and explores the many ways that polar covalent bonds and hydrogen bonds among water molecules affect organisms and their interactions with their environments. In addition, this chapter discusses topics including concentrations of solutions, hydrogen ion concentration (pH), and buffer solutions.

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