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.
This work describes the development of a new rollover carwash structure designed to accomplish a number of objectives: (a) minimizing manufacturing complexity;(b) improving transportation and installation strategies;a...
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This work describes the development of a new rollover carwash structure designed to accomplish a number of objectives: (a) minimizing manufacturing complexity;(b) improving transportation and installation strategies;and (c) reducing weight and size. As the newly developed structure is significantly lower in weight, it was necessary to ensure its adequate performance. Therefore, a numerical modelling study was done to evaluate the mechanical behaviour of the new structure and to ensure it performs well both under normal operating conditions and when subjected to common hazards. The results obtained allowed concluding that the new designed structure is capable of withstanding the loads applied under normal conditions, in lifting operations, and that excessive vibrations are not expected. In case of column obstruction, which is considered as a hazard, the maximum stress may reach values close to the yield stress of the material;however, the proposed redesign reduces the stress levels back to the elastic region. These conclusions gave useful indications to review structure design to minimize the risks related to the identified problems.
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.
In this work, we examine the synchronization control for a class of second order distributed parameter systems. The objective is to design controllers that guarantee agreement between the position and velocity states ...
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Water quality impact due to excessive nutrients has been extensively studied. In recent years, however, micro-pollutants such as pharmaceuticals and hormonal products used in animal agriculture have added an additiona...
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Water quality impact due to excessive nutrients has been extensively studied. In recent years, however, micro-pollutants such as pharmaceuticals and hormonal products used in animal agriculture have added an additional impact to overall water quality. Pharmaceuticals used in the poultry, swine, beef, and dairy industries have been detected in various environmental matrices such as, soil, groundwater and surface water. In this study, 26 surface water samples were collected throughout the Bosque River Watershed （BRW） with samples representing a range of land use conditions and locations of major dairy operations. Samples were analyzed using commercially available Enzyme-Linked Immunosorbent Assay test. Of the 26 samples, three samples consistently tested positive for monensin antibiotic with concentration ranging from 0.30 to 3.41 μg/L. These three samples were collected from sites that received varying amount of agriculture wastes （11.7% to 31.3%） and located downstream from sites associated with moderate levels of animal agriculture. The preliminary results suggest that there is a potential for monensin occurrence in the BRW, although initial findings indicate only very low levels.
Optimal spatial sampling of light rigorously requires that identical photoreceptors be arranged in perfectly regular arrays in two dimensions. Examples of such perfect arrays in nature include the compound eyes of ins...
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Optimal spatial sampling of light rigorously requires that identical photoreceptors be arranged in perfectly regular arrays in two dimensions. Examples of such perfect arrays in nature include the compound eyes of insects and the nearly crystalline photoreceptor patterns of some fish and reptiles. Birds are highly visual animals with five different cone photoreceptor subtypes, yet their photoreceptor patterns are not perfectly regular. By analyzing the chicken cone photoreceptor system consisting of five different cell types using a variety of sensitive microstructural descriptors, we find that the disordered photoreceptor patterns are “hyperuniform” (exhibiting vanishing infinite-wavelength density fluctuations), a property that had heretofore been identified in a unique subset of physical systems, but had never been observed in any living organism. Remarkably, the patterns of both the total population and the individual cell types are simultaneously hyperuniform. We term such patterns “multihyperuniform” because multiple distinct subsets of the overall point pattern are themselves hyperuniform. We have devised a unique multiscale cell packing model in two dimensions that suggests that photoreceptor types interact with both short- and long-ranged repulsive forces and that the resultant competition between the types gives rise to the aforementioned singular spatial features characterizing the system, including multihyperuniformity. These findings suggest that a disordered hyperuniform pattern may represent the most uniform sampling arrangement attainable in the avian system, given intrinsic packing constraints within the photoreceptor epithelium. In addition, they show how fundamental physical constraints can change the course of a biological optimization process. Our results suggest that multihyperuniform disordered structures have implications for the design of materials with novel physical properties and therefore may represent a fruitful area for future research
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