scholarly journals Direct observation of DNA dynamics in semidilute solutions in extensional flow

2017 ◽  
Vol 61 (1) ◽  
pp. 151-167 ◽  
Author(s):  
Kai-Wen Hsiao ◽  
Chandi Sasmal ◽  
J. Ravi Prakash ◽  
Charles M. Schroeder
Keyword(s):  
Direct Observation ◽  
Extensional Flow ◽  
Dna Dynamics ◽  
Semidilute Solutions

scholarly journals Parameter-free prediction of DNA dynamics in planar extensional flow of semidilute solutions

2017 ◽  
Vol 61 (1) ◽  
pp. 169-186 ◽  
Author(s):  
Chandi Sasmal ◽  
Kai-Wen Hsiao ◽  
Charles M. Schroeder ◽  
J. Ravi Prakash
Keyword(s):  
Extensional Flow ◽  
Dna Dynamics ◽  
Semidilute Solutions ◽  
Planar Extensional Flow

scholarly journals Conformational dynamics and phase behavior of lipid vesicles in a precisely controlled extensional flow

Soft Matter ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 337-347 ◽  
Author(s):  
Dinesh Kumar ◽  
Channing M. Richter ◽  
Charles M. Schroeder
Keyword(s):  
Phase Behavior ◽  
Phase Diagrams ◽  
Direct Observation ◽  
Conformational Dynamics ◽  
Extensional Flow ◽  
Lipid Vesicles ◽  
Precise Characterization ◽  
Flow Phase

Direct observation of vesicle conformational dynamics in extensional flow and precise characterization of flow phase diagrams using a Stokes trap.

scholarly journals Dynamics and rheology of ring-linear blend semidilute solutions in extensional flow: Single molecule experiments

2021 ◽  
Vol 65 (4) ◽  
pp. 729-744
Author(s):  
Yuecheng Zhou ◽  
Charles D. Young ◽  
Megan Lee ◽  
Sourya Banik ◽  
Dejie Kong ◽  
...  
Keyword(s):  
Single Molecule ◽  
Extensional Flow ◽  
Semidilute Solutions

scholarly journals Dynamics and rheology of ring-linear blend semidilute solutions in extensional flow. Part I: Modeling and molecular simulations

2021 ◽  
Vol 65 (4) ◽  
pp. 757-777
Author(s):  
Charles D. Young ◽  
Yuecheng Zhou ◽  
Charles M. Schroeder ◽  
Charles E. Sing
Keyword(s):  
Extensional Flow ◽  
Molecular Simulations ◽  
Semidilute Solutions ◽  
Flow Part

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

Direct Observation of the Diffusionless β → β + ω Transformation in Titanium Alloys

1971 ◽  
Vol 29 ◽  
pp. 122-123
Author(s):  
N. E. Paton ◽  
D. de Fontaine ◽  
J. C. Williams
Keyword(s):  
Electron Microscope ◽  
Titanium Alloys ◽  
Direct Observation ◽  
Dark Field ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Selected Area Electron Diffraction ◽  
Ti Alloys ◽  
Thin Foils ◽  
Field Device

The electron microscope has been used to study the diffusionless β → β + ω transformation occurring in certain titanium alloys at low temperatures. Evidence for such a transformation was obtained by Cometto et al by means of x-ray diffraction and resistivity measurements on a Ti-Nb alloy. The present work shows that this type of transformation can occur in several Ti alloys of suitable composition, and some of the details of the transformation are elucidated by means of direct observation in the electron microscope.Thin foils were examined in a Philips EM-300 electron microscope equipped with a uniaxial tilt, liquid nitrogen cooled, cold stage and a high resolution dark field device. Selected area electron diffraction was used to identify the phases present and the ω-phase was imaged in dark field by using a (101)ω reflection. Alloys were water quenched from 950°C, thinned, and mounted between copper grids to minimize temperature gradients in the foil.

A New 1000kv Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 100-101
Author(s):  
J.L. Williams ◽  
K. Heathcote ◽  
E.J. Greer
Keyword(s):  
Electron Microscope ◽  
Direct Observation ◽  
High Voltage ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Specimen Thickness ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
Dynamic Experiments ◽  
Conventional Instrument

High Voltage Electron Microscope already offers exciting experimental possibilities to Biologists and Materials Scientists because the increased specimen thickness allows direct observation of three dimensional structure and dynamic experiments on effectively bulk specimens. This microscope is designed to give maximum accessibility and space in the specimen region for the special stages which are required. At the same time it provides an ease of operation similar to a conventional instrument.

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