Search results for: J. Kratochvíl

Items from 1 to 20 out of 63 results

article

Does coexisting accommodative dysfunction impact clinical convergence measures, symptoms and treatment success for symptomatic convergence insufficiency in children?

Marjean T Kulp, Loraine T Sinnott, Susan A Cotter, Eric Borsting, more

Ophthalmic and Physiological Optics > 42 > 1 > 59 - 70

Purpose To determine whether coexisting accommodative dysfunction in children with symptomatic convergence insufficiency (CI) impacts presenting clinical convergence measures, symptoms and treatment success for CI. Methods Secondary data analyses of monocular accommodative amplitude (AA; push‐up method), monocular accommodative facility (AF; ±2.00 D lens flippers) and symptoms (CI Symptom Survey...

article

Structural atrophy of the right superior frontal gyrus in adolescents with severe irritability

Ji‐Woo Seok, Sahil Bajaj, Brigette Soltis‐Vaughan, Arica Lerdahl, more

Human Brain Mapping > 42 > 14 > 4611 - 4622

Severe irritability is common in youths with psychiatric disorders and results in significant dysfunction across domains (academic, social, and familial). Prior structural MRI studies in the pediatric population demonstrated that aberrations of cortical thickness (CT) and gray matter volume (GMV) in the fronto‐striatal‐temporal regions which have been associated with irritability. However, the directions...

article

Effectiveness of vergence/accommodative therapy for accommodative dysfunction in children with convergence insufficiency

Angela M Chen, Tawna L Roberts, Susan A Cotter, Marjean T Kulp, more

Ophthalmic and Physiological Optics > 41 > 1 > 21 - 32

Purpose To determine the effectiveness of office‐based vergence/accommodative therapy for improving accommodative amplitude and accommodative facility in children with symptomatic convergence insufficiency and accommodative dysfunction. Methods We report changes in accommodative function following therapy among participants in the Convergence Insufficiency Treatment Trial – Attention and Reading...

article

Aligning student‐led initiatives and Incident Command System resources in a pandemic

Taylor J. Kratochvil, Rohan Khazanchi, RemyGrace M. Sass, Kelly J. Caverzagie

Medical Education > 54 > 12 > 1183 - 1184

article

Antibacterial effect of Cu/C:F nanocomposites deposited on PEEK substrates

J. Kratochvíl, J. Štěrba, J. Lieskovská, H. Langhansová, more

Materials Letters > 2018 > 230 > C > 96-99

The study focuses on antibacterial Cu/C:F nanocomposites deposited onto polyether-ether-ketone (PEEK) substrates. The nanocomposites were prepared by means of physical vapour deposition; copper nanoparticles (NPs), produced with the use of a gas aggregation source, were coated with RF sputtered polytetrafluorethylene. It was found that nanocomposites, formed with a properly tailored number of Cu NPs...

article

Effect of chip breakers on the cutting force during the machining of steel C45

J. Kratochvíl, J. Petrů, M. Pagáč, J. Holubják, more

Advances in Science and Technology. Research Journal > 2017 > Vol. 11, no 1 > 173--178

The paper deals with the dependence of cutting force on the breaker of an indexable cutting insert (ICI). The experiment monitored individual cutting force components for different insert breakers, cutting speeds and feed rates during machining. The cutting depth remained constant. The tool holder, material and coating of the indexable cutting insert was also identical.

article

Noble metal nanostructures for double plasmon resonance with tunable properties

M. Petr, O. Kylián, A. Kuzminova, J. Kratochvíl, more

Optical Materials > 2017 > 64 > C > 276-281

We report and compare two vacuum-based strategies to produce Ag/Au materials characterized by double plasmon resonance peaks: magnetron sputtering and method based on the use of gas aggregation sources (GAS) of nanoparticles. It was observed that the double plasmon resonance peaks may be achieved by both of these methods and that the intensities of individual localized surface plasmon resonance peaks...

article

Superhydrophobic fluorine-free hierarchical coatings produced by vacuum based method

M. Petr, J. Hanuš, O. Kylián, J. Kratochvíl, more

Materials Letters > 2016 > 167 > C > 30-33

In this study it is presented fully vacuum-based, substrate independent method for fabrication of fluorine-free superhydrophobic surfaces based on combination of gas aggregation sources of nanoparticles and plasma polymerization. This method involves deposition of films of nanoparticles that are subsequently overcoated by plasma polymerized n-hexane. Two different kinds of nanoparticles that differ...

article

Numerical Simulations of Glide Dislocations in Persistent Slip Band

M. Kolář, M. Beneš, J. Kratochvíl, P. Pauš

Acta Physica Polonica A > 2015 > 128 > 4 > 506-509

For the purpose of estimation of possible inaccuracy in standard discrete dislocation dynamics simulations, we study the motion of interacting dislocations in two regimes: the standard stress control and the total strain control. For demonstration of the difference, we consider two dislocations of opposite signs, gliding in parallel slip planes in a channel of a persistent slip band. Exposed to the...

article

Numerical Simulation of Dislocation Cross-Slip with Annihilation in Non-Symmetric Configuration

P. Pauš, M. Beneš, J. Kratochvíl

Acta Physica Polonica A > 2015 > 128 > 4 > 737-739

The interpretation of the experimentally determined critical distance of the screw dislocation annihilation in persistent slip bands is still an open question. We attempt to analyze this problem using the discrete dislocation dynamics simulations. Dislocations are represented by parametrically described curves. The model is based on the numerical solution of the dislocation motion law belonging to...

article

Environmental infection control considerations for Ebola

John J. Lowe, Patricia L. Olinger, Shawn G. Gibbs, Kalpana Rengarajan, more

AJIC: American Journal of Infection Control > 2015 > 43 > 7 > 747-749

article

Planning and response to Ebola virus disease: An integrated approach

Philip W. Smith, Kathleen C. Boulter, Angela L. Hewlett, Christopher J. Kratochvil, more

AJIC: American Journal of Infection Control > 2015 > 43 > 5 > 441-446

The care of patients with Ebola virus disease (EVD) requires the application of critical care medicine principles under conditions of stringent infection control precautions. The care of patients with EVD requires a number of elements in terms of physical layout, personal protective apparel, and other equipment. Provision of care is demanding in terms of depth of staff and training. The key to safely...

article

Nebraska Biocontainment Unit patient discharge and environmental decontamination after Ebola care

Katelyn C. Jelden, Shawn G. Gibbs, Philip W. Smith, Michelle M. Schwedhelm, more

AJIC: American Journal of Infection Control > 2015 > 43 > 3 > 203-205

article

Intraoral Basal Cell Carcinoma, a Rare Neoplasm: Report of Three New Cases with Literature Review

T. R. Woods, D. M. Cohen, M. N. Islam, F. J. Kratochvil, more

Head and Neck Pathology > 2014 > 8 > 3 > 339-348

Intraoral basal cell carcinoma (IOBCC) is an extremely rare entity that bears close microscopic resemblance to and is often confused with the peripheral ameloblastoma (PA). Basal cell carcinomas are thought to arise from pluripotential basal cells present within surface epithelium and adnexal structures, so theoretically they can arise within the oral cavity. Many of the early cases reported as IOBCC...

article

Fabrication of Cu nanoclusters and their use for production of Cu/plasma polymer nanocomposite thin films

O. Kylián, J. Kratochvíl, J. Hanuš, O. Polonskyi, more

Thin Solid Films > 2014 > 550 > Complete > 46-52

Deposition of Cu nanoclusters produced by compact gas aggregation nanocluster source without size filtration is investigated. The main emphasis is given to the determination of influence of operating conditions (pressure in the aggregation and deposition chambers, magnetron current) on deposition rate of Cu nanoclusters as well as on the evaluation of their size distribution and chemical structure...

article

Superhydrophobic Polymer Multilayers that Promote the Extended, Long‐Term Release of Embedded Water‐Soluble Agents

Uttam Manna, Michael J. Kratochvil, David M. Lynn

Advanced Materials > 25 > 44 > 6405 - 6409

Polymer multilayers that exhibit surface and bulk superhydrophobicity are demonstrated to promote long‐term release of water‐soluble agents (for ca.1 year) when submerged in water. The extremely nonwetting nature of these materials prevents rapid influx of water, addressing a key limitation inherent to polyelectrolytebased multilayers that release imbedded agents quickly. Our results provide new and...

article

Simulation of Dislocation Annihilation by Cross-Slip

P. Pauš, M. Beneš, J. Kratochvíl

Acta Physica Polonica A > 2012 > 122 > 3 > 509-511

This contribution deals with the numerical simulation of dislocation dynamics, their interaction, merging and changes in the dislocation topology. The glide dislocations are represented by parametrically described curves moving in slip planes. The simulation model is based on the numerical solution of the dislocation motion law belonging to the class of curvature driven curve dynamics. We focus on...

article

Crystal Plasticity Treated as a Quasi-Static Material Flow through Adjustable Crystal Lattice

J. Kratochvíl

Acta Physica Polonica A > 2012 > 122 > 3 > 482-484

Considering high pressure torsion experiments as a motivation, plastic behavior of crystalline solids is treated as a highly viscous material flow through an adjustable crystal lattice. Instead of the traditional decomposition rule considering the deformation gradient as a product of the elastic and plastic parts, the proposed model is based on its rate form: the velocity gradient consists of the...

article

A thermodynamically compatible rate type fluid to describe the response of asphalt

J. Hron, J. Kratochvíl, J. Málek, K.R. Rajagopal, more

Mathematics and Computers in Simulation > 2012 > 82 > 10 > 1853-1873

In this paper, we consider two models that have been recently developed from a thermodynamic standpoint and that are capable of describing the response of nonlinear viscoelastic fluids. We test the efficacy of both models by comparing their predictions against torsion experiments conducted for asphalt, a material that is notoriously difficult to model. Both the models seem to describe the response...

article

Influence of clay content on the melting behavior and crystal structure of nonisothermal crystallized poly(L‐lactic acid)/nanocomposites

F. Ublekov, J. Baldrian, J. Kratochvil, M. Steinhart, more

Journal of Applied Polymer Science > 124 > 2 > 1643 - 1648

To study the effect of organophilic clay concentration on nonisothermal crystallization, poly(L‐lactic acid) (PLLA)/montmorillonite (MMT) nanocomposites were prepared by mixing various amounts of commercial MMT (Cloisite^® 30B) and PLLA. The effect of MMT content on melting behavior and crystal structure of nonisothermal crystallized PLLA/MMT nanocomposites was investigated by differential scanning...

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INFONA - science communication portal

Search results for: J. Kratochvíl

Does coexisting accommodative dysfunction impact clinical convergence measures, symptoms and treatment success for symptomatic convergence insufficiency in children?

Structural atrophy of the right superior frontal gyrus in adolescents with severe irritability

Effectiveness of vergence/accommodative therapy for accommodative dysfunction in children with convergence insufficiency

Aligning student‐led initiatives and Incident Command System resources in a pandemic

Antibacterial effect of Cu/C:F nanocomposites deposited on PEEK substrates

Effect of chip breakers on the cutting force during the machining of steel C45

Noble metal nanostructures for double plasmon resonance with tunable properties

Superhydrophobic fluorine-free hierarchical coatings produced by vacuum based method

Numerical Simulations of Glide Dislocations in Persistent Slip Band

Numerical Simulation of Dislocation Cross-Slip with Annihilation in Non-Symmetric Configuration

Environmental infection control considerations for Ebola

Planning and response to Ebola virus disease: An integrated approach

Nebraska Biocontainment Unit patient discharge and environmental decontamination after Ebola care

Intraoral Basal Cell Carcinoma, a Rare Neoplasm: Report of Three New Cases with Literature Review

Fabrication of Cu nanoclusters and their use for production of Cu/plasma polymer nanocomposite thin films

Superhydrophobic Polymer Multilayers that Promote the Extended, Long‐Term Release of Embedded Water‐Soluble Agents

Simulation of Dislocation Annihilation by Cross-Slip

Crystal Plasticity Treated as a Quasi-Static Material Flow through Adjustable Crystal Lattice

A thermodynamically compatible rate type fluid to describe the response of asphalt

Influence of clay content on the melting behavior and crystal structure of nonisothermal crystallized poly(L‐lactic acid)/nanocomposites

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