Electrical actuation is investigated in two kinds of chiral smectic liquid-crystal elastomers (LCEs) with different domain structures LCE1 and LCE2: The latter is better than the former in orientational order. Trackin...
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Electrical actuation is investigated in two kinds of chiral smectic liquid-crystal elastomers (LCEs) with different domain structures LCE1 and LCE2: The latter is better than the former in orientational order. Tracking fluorescent beads dispersed on the samples enables us to measure the two-dimensional strain tensors in ferroelectric elastomer films. It turns out that the electric-field-induced strain is polarity dependent and the type of molecular orientation responsible for the strain is specified. In LCE1 the shear strain is dominant, whereas in LCE2 it is comparable to the elongation strain, which is explained by the rotation of the principal axes. The essential differences of the two elastomers are observed in the eigenvalues of the strain tensors. The absolute values for LCE1 are larger than those for LCE2. The difference is discussed on the basis of the domain structures.
Assessing the validity of measurement/model comparisons in fisheries acoustics is difficult, due to the uncertainty in ground truth for acoustic measurements obtained in the open water. One way to overcome this is to ...
Assessing the validity of measurement/model comparisons in fisheries acoustics is difficult, due to the uncertainty in ground truth for acoustic measurements obtained in the open water. One way to overcome this is to utilize laboratory measurements, where fish school parameters may be more well known. The primary purpose of this work was to investigate the feasibility of measuring the acoustic properties of a small group of live fish in a laboratory tank using a steady state subtraction method [J. Acoust. Soc. Am. 112, 1366-1376 (2002)]. Transfer function measurements were obtained in a fresh water tank that contained an enclosed group of goldfish (Carassius auratus auratus), in order to describe their resonance scattering behavior. The experimental results were compared with an existing predictive model [J. Acoust. Soc. Am. 99, 196-208 (1996)], which incorporates both multiple scattering effects between fish, and coherent interaction of their individual scattered fields. Computational modeling, experimental details and data/model comparison will be presented. This technique can be extended to larger tanks and other fish species.
作者：
Ji WangBin ZhouX.Sherry LiuAaron J.FieldsArnav SanyalXiutao ShiMark AdamsTony M.KeavenyX.Edward GuoDepartment of Mechanical Engineering
University of California Berkeley Berkeley CA U.S.A. Department of Mechanical Engineering University of California Berkeley Berkeley CA U.S.A. Department of Applied Physics and Applied MathematicsColumbia University New York New York U.S.A. Bone Bioengineering Laboratory
Department of Biomedical Engineering Columbia University New York New YorkU.S.A. Bone Bioengineering Laboratory Department of Biomedical Engineering Columbia University New York New YorkU.S.A. McKay Orthopaedic Research Laboratory
Department of Orthopaedic Surgery University of Pennsylvania Philadelphia PA U.S.A. Department of Orthopaedic Surgery University of California San Francisco San Francisco CA U.S.A.
We apply r-p adaptive time-implicit Discontinuous Galerkin (DG) methods to 2-D hypersonic flow problems. Previous applications of DG method were limited to viscous hypersonic flows. Here we extend DG to chemically rea...
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The micro-/nano-channel fluidic science and technology have been attracting biophysics attentions,one of the main reasons is it can be effectively used in stretching,separating,manipulating and sequencing single *** g...
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The micro-/nano-channel fluidic science and technology have been attracting biophysics attentions,one of the main reasons is it can be effectively used in stretching,separating,manipulating and sequencing single *** general,driven with electric field force,the direction and velocity of DNA molecules moving within the fluidic channel are depended on the value and direction of applied electric field,besides the structure and shape of the channels.
Amorphous hydrogenated carbon (a-C:H) and amorphous deuterated carbon (a-C:D) films were prepared using radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) from CH4 and CD4 gas sources, respectively. ...
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Amorphous hydrogenated carbon (a-C:H) and amorphous deuterated carbon (a-C:D) films were prepared using radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) from CH4 and CD4 gas sources, respectively. Both films were prepared by adjusting the process pressure between 1 and 300 Pa. The films were characterized using Raman spectroscopy, and the concentrations of hydrogen (H) and deuterium (D) relative to carbon (C) in the films were determined by elastic recoil detection analysis (ERDA) and Rutherford backscattering spectroscopy (RBS). Contact angle and blood clot formation on the films were observed to evaluate the antithrombogenicity of the a-C:H and the a-C:D films. The a-C:D film contact angles were lower than the a-C:H film contact angles. These lower contact angles were correlated to lower antithrombogenicity of the a-C:D films compared with the a-C:H films.
The lattice Boltzmann method is widely used in solving hydrodynamics for various *** accuracy of the extrapolation method for boundary conditions and Mei’s method for curved boundary is not high *** propose a modifie...
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The lattice Boltzmann method is widely used in solving hydrodynamics for various *** accuracy of the extrapolation method for boundary conditions and Mei’s method for curved boundary is not high *** propose a modified extrapolation method for boundary *** simulations conform the higher accuracy and stability compared with the other methods.
In this contribution we detail our efforts to investigate the structural effects of cations binding to peptides and amino acids. We perform first-principles studies employing long-range dispersion-corrected approximat...
In this contribution we detail our efforts to investigate the structural effects of cations binding to peptides and amino acids. We perform first-principles studies employing long-range dispersion-corrected approximate density-functional theory and compare to gas-phase experiments.
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