46,811 research outputs found
An isogeometric analysis for elliptic homogenization problems
A novel and efficient approach which is based on the framework of
isogeometric analysis for elliptic homogenization problems is proposed. These
problems possess highly oscillating coefficients leading to extremely high
computational expenses while using traditional finite element methods. The
isogeometric analysis heterogeneous multiscale method (IGA-HMM) investigated in
this paper is regarded as an alternative approach to the standard Finite
Element Heterogeneous Multiscale Method (FE-HMM) which is currently an
effective framework to solve these problems. The method utilizes non-uniform
rational B-splines (NURBS) in both macro and micro levels instead of standard
Lagrange basis. Beside the ability to describe exactly the geometry, it
tremendously facilitates high-order macroscopic/microscopic discretizations
thanks to the flexibility of refinement and degree elevation with an arbitrary
continuity level provided by NURBS basis functions. A priori error estimates of
the discretization error coming from macro and micro meshes and optimal micro
refinement strategies for macro/micro NURBS basis functions of arbitrary orders
are derived. Numerical results show the excellent performance of the proposed
method
Teledentistry: An Innovative Workforce Model for Dental Hygienists
Objective/Aims: This review of literature seeks to explore teledentistry as an alternative dental hygiene workforce model that places a dental hygienist in the role of the mid-level practitioner as part of a digitally-connected oral healthcare team. It will also emphasize the innovative methods of teledentistry giving better health care delivery to diverse populations.
Methods: The review of literature analyzed the conclusions and discussions of primary and secondary scholarly articles from PubMed, Google Scholar, Embase, and CINAHL. Specific key terms included teledentistry, telehealth, teleconsultation, dental hygiene, dentistry, workforce model, health care delivery. Articles included in this review were published within the five last years.
Results: Multiple scholarly articles were compiled together to emphasize the importance of technology-centered dental health care for patients who were unable to travel long distances to retrieve the care they were seeking, Key limitations the research often indicated include geographic, socioeconomic barriers or distance.
Conclusion: The teledentistry-assisted model presents one way to answer the call to expand overall access to oral healthcare. The comparison of articles supported the efficiency and cost-effectiveness method of teledentistry in comparison to face to face consultations. Teledentistry is especially beneficial to addressing the access to care issue particularly populations in rural areas and even penitentiary institutions.https://scholarscompass.vcu.edu/denh_student/1025/thumbnail.jp
Complexation of DNA with positive spheres: phase diagram of charge inversion and reentrant condensation
The phase diagram of a water solution of DNA and oppositely charged spherical
macroions is studied. DNA winds around spheres to form beads-on-a-string
complexes resembling the chromatin 10 nm fiber. At small enough concentration
of spheres these "artificial chromatin" complexes are negative, while at large
enough concentrations of spheres the charge of DNA is inverted by the adsorbed
spheres. Charges of complexes stabilize their solutions. In the plane of
concentrations of DNA and spheres the phases with positive and negative
complexes are separated by another phase, which contains the condensate of
neutral DNA-spheres complexes. Thus when the concentration of spheres grows,
DNA-spheres complexes experience condensation and resolubilization (or
reentrant condensation). Phenomenological theory of the phase diagram of
reentrant condensation and charge inversion is suggested. Parameters of this
theory are calculated by microscopic theory. It is shown that an important part
of the effect of a monovalent salt on the phase diagram can be described by the
nontrivial renormalization of the effective linear charge density of DNA wound
around a sphere, due to the Onsager-Manning condensation. We argue that our
phenomenological phase diagram or reentrant condensation is generic to a large
class of strongly asymmetric electrolytes. Possible implication of these
results for the natural chromatin are discussed.Comment: Many corrections to text. SUbmitted to J. Chem. Phy
A cell-based smoothed discrete shear gap method (CS-DSG3) using triangular elements for static and free vibration analyses of shell structures
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