1,021 research outputs found
Spinor field realizations of the non-critical string based on the linear algebra
In this paper, we investigate the spinor field realizations of the
algebra, making use of the fact that the algebra can be linearized
through the addition of a spin-1 current. And then the nilpotent BRST charges
of the spinor non-critical string were built with these realizations.Comment: 10 pages, no figures, revtex4 style, accepted by Commun.Theor.Phy
Microheated substrates for patterning cells and controlling development
Here, we seek to control cellular development by devising a means through which cells can be subjected to a microheated environment in standard culture conditions. Numerous techniques have been devised for controlling cellular function and development via manipulation of surface environmental cues at the micro- and nanoscale. It is well understood that temperature plays a significant role in the rate of cellular activities, migratory behavior (thermotaxis), and in some cases, protein expression. Yet, the effects and possible utilization of micrometer-scale temperature fields in cell cultures have not been explored. Toward this end, two types of thermally isolated microheated substrates were designed and fabricated, one with standard backside etching beneath a dielectric film and another with a combination of surface and bulk micromachining and backside etching. The substrates were characterized with infrared microscopy, finite element modeling, scanning electron microscopy, stylus profilometry, and electrothermal calibrations. Neuron culture studies were conducted on these substrates to 1) examine the feasibility of using a microheated environment to achieve patterned cell growth and 2) selectively accelerate neural development on regions less than 100wide. Results show that attached neurons, grown on microheated regions set at 37, extended processes substantially faster than those incubated at 25on the same substrate. Further, unattached neurons were positioned precisely along the length of the heater filament (operating at 45) using free convection currents. These preliminary findings indicate that microheated substrates may be used to direct cellular development spatially in a practical manner.$hfillhbox[1414]
Uniform bounds on the 1-norm of the inverse of lower triangular Toeplitz matrices
A uniform bound on the 1-norm is given for the inverse of a lower triangular Toeplitz matrix with non-negative monotonically decreasing entries whose limit is zero. The new bound is sharp under certain specified constraints. This result is then employed to throw light upon a long standing open problem posed by Brunner concerning the convergence of the one-point collocationmethod for the Abel equation. In addition, the recent conjecture of Gauthier et al. is proved
PP-111 Hepatitis B virus (HBV) subgenotypes and mutations in core promoter and precore/core and their clinical implications in Xinjiang Uighur patients
Superradiance of low density Frenkel excitons in a crystal slab of three-level atoms: Quantum interference effect
We systematically study the fluorescence of low density Frenkel excitons in a
crystal slab containing V-type three-level atoms. Based on symmetric
quasi-spin realization of SU(3) in large limit, the two-mode exciton
operators are invoked to depict various collective excitations of the
collection of these V-type atoms starting from their ground state. By making
use of the rotating wave approximation, the light intensity of radiation for
the single lattice layer is investigated in detail. As a quantum coherence
effect, the quantum beat phenomenon is discussed in detail for different
initial excitonic states. We also test the above results analytically without
the consideration of the rotating wave approximation and the self-interaction
of radiance field is also included.Comment: 18pages, 17 figures. Resubmit to Phys. Rev.
A piezoelectric screw dislocation near an elliptical inhomogeneity containing a confocal rigid line
Detection of herb-symptom associations from traditional chinese medicine clinical data
YesTraditional Chinese medicine (TCM) is an individualized medicine by observing the symptoms and signs (symptoms in brief) of patients. We aim to extract the meaningful herb-symptom relationships from large scale TCM clinical data. To investigate the correlations between symptoms and herbs held for patients, we use four clinical data sets collected from TCM outpatient clinical settings and calculate the similarities between patient pairs in terms of the herb constituents of their prescriptions and their manifesting symptoms by cosine measure. To address the large-scale multiple testing problems for the detection of herb-symptom associations and the dependence between herbs involving similar efficacies, we propose a network-based correlation analysis (NetCorrA) method to detect the herb-symptom associations. The results show that there are strong positive correlations between symptom similarity and herb similarity, which indicates that herb-symptom correspondence is a clinical principle adhered to by most TCM physicians. Furthermore, the NetCorrA method obtains meaningful herb-symptom associations and performs better than the chi-square correlation method by filtering the false positive associations. Symptoms play significant roles for the prescriptions of herb treatment. The herb-symptom correspondence principle indicates that clinical phenotypic targets (i.e., symptoms) of herbs exist and would be valuable for further investigations
Spinor Field Realizations of Non-critical Strings
In this paper, we construct the nilpotent Becchi-Rouet-Stora-Tyutin()
charges of spinor non-critical strings. The cases of are
discussed in detail, and spinor realization for is given explicitly. The
charges are graded.Comment: 9 pages, no figure
Does entropic force always imply the Newtonian force law?
We study the entropic force by introducing a bound between
entropy and area which was derived by imposing the non-gravitational collapse
condition. In this case, applying a modified entropic force to this system does
not lead to the Newtonian force law.Comment: 11 pages, version to appear in EPJ
Study on Thermal Stress of Honeycomb Ceramic Regenerators with Different Parameters
In thermal flow-reversal reactor operations, honeycomb
ceramic regenerators are exposed to
thermal shock load. In this study, numerical simulations
of the temperature and thermal stress
distributions of honeycomb ceramic regenerators
are carried out using the CFX software.
Temperature variations with time are calculated
first for honeycomb ceramic regenerators with
holes of different shapes. Then, thermal stress
distributions of regenerators are analyzed with
different structural and operational parameters.
The analyses show that the thermal stress of honeycomb
ceramic regenerator depends on the
shape of holes, porosity and wall thicknesses.
This study provides a theoretical basis for optimization
of honeycomb ceramic regenerators.При работе ядерного реверс-поточного реактора керамические сотовые регенераторы подвергаются действию термоударной нагрузки. С помощью программного обеспечения CFX
проведено численное моделирование эпюр температуры и температурного напряжения керамических сотовых регенераторов. Исследовано изменение температур во времени для керамических сотовых регенераторов с отверстиями различной формы. Проанализированы
эпюры температурного напряжения регенераторов с разными конструкционными и эксплуатационными параметрами. Установлено, что температурное напряжение керамического
сотового регенератора зависит от формы отверстий, пористости и толщины стенок.
Результаты данного исследования служат теоретической базой для оптимизации керамических сотовых регенераторов.При роботі ядерного реверс-потокового реактора керамічні стільникові регенератори
зазнають дії термоударного навантаження. За допомогою програмного забезпечення
СFX проведено чисельне моделювання епюр температури і температурного напруження керамічних стільникових регенераторів. Досліджено зміну температур у часі
для керамічних стільникових регенераторів з отворами різної форми. Проаналізовано епюри температурного напруження регенераторів із різними конструкційними експлуатаційними параметрами. Установлено, що температурне напруження керамічного стільникового регенератора залежить від форми отвору, пористості і товщини стінок. Результати даного дослідження є теоретичною базою для оптимізації
керамічних стільникових регенераторів
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