843 results match your criteria sphere thickness

Effect of thickness of CAD/CAM materials on light transmission and resin cement polymerization using a blue light-emitting diode light-curing unit.

J Esthet Restor Dent 2022 Jul 27. Epub 2022 Jul 27.

Department of Dental Clinical Sciences, School of Dentistry, Dalhousie University, Halifax, Canada.

Objective: Evaluate the effect of thickness of high-translucency (HT) CAD/CAM materials on irradiance and beam profile from a blue light-emitting diode light-curing unit (LCU) and on the degree of conversion (DC) and maximum polymerization rate (Rp ) of a light-cured resin cement (LCC).

Material And Methods: The direct output from the LCU, the light transmission and irradiance ratio (IR) through one conventional composite and nine HT CAD/CAM materials (0.5, 1. Read More

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Microwave Treatment of Calcium Phosphate/Titanium Dioxide Composite to Improve Protein Adsorption.

Materials (Basel) 2022 Jul 7;15(14). Epub 2022 Jul 7.

Department of Dental Materials and Hard-Tissue Biointerface Research Center, School of Dentistry, Chonnam National University, Gwangju 61186, Korea.

Calcium phosphate has attracted enormous attention as a bone regenerative material in biomedical fields. In this study, we investigated the effect of microwave treatment on calcium phosphate deposited TiO nanoflower to improve protein adsorption. Hierarchical rutile TiO nanoflowers (TiNF) fabricated by a hydrothermal method were soaked in modified simulated body fluid for 3 days to induce calcium phosphate (CAP) formation, followed by exposure to microwave radiation (MW). Read More

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Visual Outcomes of Small-Incision Lenticule Extraction (SMILE) in Thin Corneas.

J Clin Med 2022 Jul 18;11(14). Epub 2022 Jul 18.

Ophthalmological Clinic "Sphere", 117628 Moscow, Russia.

We aimed to find out whether thin (≤500 μm) or normal (>500 μm, control) corneal thickness would impact efficacy and safety outcomes of small-incision lenticule extraction (SMILE). We retrospectively analyzed medical records of adult patients who had undergone SMILE. A total of 57 eyes were included in the "thin corneas" group and 180 eyes in the "control" group. Read More

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Aqueous aggregation and deposition kinetics of fresh and carboxyl-modified nanoplastics in the presence of divalent heavy metals.

Water Res 2022 Jul 17;222:118877. Epub 2022 Jul 17.

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China.

The presence of heavy metals alters the colloidal stability and deposition of nanoplastics (NPs) in urban waters. Such processes are important to assess the mobility and fate of NPs and their associated heavy metals. Up to date, few studies have reported the impact of heavy metals on the colloidal behaviors of NPs and the involved mechanisms. Read More

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Effects of surface treatment and shade on the color, translucency, and surface roughness of high-translucency self-glazed zirconia materials.

J Prosthet Dent 2022 Jul 8. Epub 2022 Jul 8.

Associate Professor, Department of General Dentistry, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China. Electronic address:

Statement Of Problem: The impact of different surface treatments and shades on the color, translucency, and surface roughness of high-translucency self-glazed zirconia materials is unclear.

Purpose: The purpose of this in vitro study was to investigate the effects of different external surface treatments (self-glazed, milled, polished, and glazed), intaglio surface treatments (milled and airborne-particle abraded), and shades (A1 and A3 shades) on the color, translucency, and surface roughness of high-translucency self-glazed zirconia materials, as well as the correlations among optical parameters, translucency, and surface roughness.

Material And Methods: Eighty shade A1 and 80 shade A3 disks were fabricated with a thickness of 0. Read More

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Efficient and Fast Removal of Aqueous Tungstate by an Iron-Based LDH Delaminated in L-Asparagine.

Int J Environ Res Public Health 2022 06 14;19(12). Epub 2022 Jun 14.

Geological Institute, Russian Academy of Sciences, 119017 Moscow, Russia.

High concentrations of tungstate in aqueous systems pose a severe threat to the environment and human health. This study explored the potential of iron-based LDHs to remove tungstate from water. To improve its tungstate uptake capacity, environment-friendly L-asparagine was used to delaminate iron-based LDH synthesized via a coprecipitation method. Read More

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Effects of thickness reduction in cold rolling process on the formability of sheet metals using ANFIS.

Sci Rep 2022 Jun 21;12(1):10434. Epub 2022 Jun 21.

College of Engineering, Civil Engineering Department, Prince Sattam Bin Abdulaziz University, Al-Kharj, 16273, Saudi Arabia.

Cold rolling has detrimental effect on the formability of sheet metals. It is, however, inevitable in producing sheet high quality surfaces. The effects of cold rolling on the forming limits of stretch sheets are not investigated comprehensively in the literature. Read More

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Electroprecipitation of Nanometer-Thick Films of Ln(OH) [Ln = La, Ce, and Lu] at Pt Microelectrodes and Their Effect on Electron-Transfer Reactions.

Langmuir 2022 Jul 17;38(26):8125-8134. Epub 2022 Jun 17.

Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.

We report investigations of the deposition of nanometer-thick Ln(OH) films (Ln = La, Ce, and Lu) and their effect on outer-sphere and inner-sphere electron-transfer reactions. Insoluble Ln(OH) films are deposited from aqueous solutions of LaCl onto the surface of 12.5 μm radius Pt microdisk electrodes during water or oxygen reduction. Read More

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Angle κ Measurement and Its Correlation with Other Ocular Parameters in Normal Population by a New Imaging Modality.

Optom Vis Sci 2022 Jul 3;99(7):580-588. Epub 2022 Jun 3.

Significance: This study obtained normative database for angle κ using Orbscan 3. The average angle κ values were 2.3 ± 1. Read More

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Ultrasensitive Frequency Shifting of Dielectric Mie Resonance near Metallic Substrate.

Research (Wash D C) 2022 9;2022:9862974. Epub 2022 May 9.

Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

Dielectric resonators on metallic surface can enhance far-field scattering and boost near-field response having promising applications in nonlinear optics and reflection-type devices. However, the dependence of gap size between dielectric resonator and metallic surface on Mie resonant frequency is complex and desires a comprehensive physical interpretation. Here, we systematically study the effect of metallic substrate on the magnetic dipole (MD) resonant frequency at X-band by placing a high permittivity CaTiO ceramic block on metallic substrate and regulating their gap size. Read More

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Iridescent Colloidal Crystals Composed of SiO Porous Hollow Sphere for SERS Application.

Langmuir 2022 May 5;38(19):6217-6223. Epub 2022 May 5.

Department of Resource Engineering, National Cheng Kung University, Tainan City 701, Taiwan.

In recent years, the application of low-refractive-index materials in the optical field has attracted considerable attention due to it high transmittance and high optical sensitivity. In this study, we synthesized SiO porous hollow spheres (SPHS) with an ultralow refractive index ( = 1.05) by using a templating method. Read More

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Thick shielding against galactic cosmic radiation: A Monte Carlo study with focus on the role of secondary neutrons.

Life Sci Space Res (Amst) 2022 May 9;33:58-68. Epub 2022 Apr 9.

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany. Electronic address:

The exposure to galactic cosmic radiation (GCR) is a major health concern for astronauts. Crewed missions with durations of several years are foreseen in future space exploration projects such as permanent habitats on the Moon and flights to Mars. This aim requires elaborate space radiation shielding concepts and a proper understanding of the underlying radiation physics and radiobiology as well as their interplay. Read More

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Diabetic patients treated with metformin during early stages of Alzheimer's disease show a better integral performance: data from ADNI study.

Geroscience 2022 Jun 20;44(3):1791-1805. Epub 2022 Apr 20.

Instituto de Biología y Medicina Experimental, CONICET, Buenos Aires, Argentina.

We evaluated the effect of the antidiabetic drug metformin on patients enrolled in the ADNI study considering patients with mild cognitive impairment (MCI) due to Alzheimer's disease (AD). Employing data from this observational study, we performed a principal component analysis focusing on the cognitive sphere by evaluating data from neuropsychological tests included in a modified version of the Alzheimer's Disease Cooperative Study-Preclinical Alzheimer Cognitive Composite (ADCS-PACC). Second, we included the levels of amyloid-β, tau, and phosphorylated tau in CSF. Read More

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Intraobserver Repeatability of Tomographic, Pachymetric, and Anatomical Measurements in Healthy Eyes Using a New Swept-Source Optical Coherence Topographer.

Cornea 2022 May;41(5):598-603

Specialized Care Unit of Ophthalmology, Elche, Alicante, Spain.

Purpose: The purpose of this study was to evaluate the intraobserver repeatability of several corneal parameters in healthy eyes using a new swept-source optical coherence topographer.

Methods: Fifty right eyes of 50 subjects were enrolled in this study. A single examiner performed 3 consecutive measurements using the Anterion swept-source optical coherence tomography. Read More

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Emotional prosody recognition is impaired in Alzheimer's disease.

Alzheimers Res Ther 2022 04 5;14(1):50. Epub 2022 Apr 5.

Memory Clinic, Department of Neurology, Second Faculty of Medicine, Charles University, Motol University Hospital, Prague, Czech Republic.

Background: The ability to understand emotions is often disturbed in patients with cognitive impairments. Right temporal lobe structures play a crucial role in emotional processing, especially the amygdala, temporal pole (TP), superior temporal sulcus (STS), and anterior cingulate (AC). Those regions are affected in early stages of Alzheimer´s disease (AD). Read More

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Twenty-Two-Year Clinical Outcome of a Case of Endokeratoplasty.

Cornea 2022 Mar 18. Epub 2022 Mar 18.

Department of Ophthalmology, Ospedali Privati Forlì "Villa Igea", Forlì, Italy.

Purpose: The purpose of this study was to report the 22-year clinical outcome of a patient who underwent endokeratoplasty.

Methods: To report the clinical outcomes of 37-year-old male who underwent endokeratoplasty for decompensated Fuchs endothelial dystrophy in 1998.

Results: After subsequent cataract surgery and iridoplasty, at 22 years post endokeratoplasty, the Snellen best spectacle-corrected visual acuity is 20/20 (-5. Read More

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Value of pseudopod sign on high-frequency ultrasound in predicting the pathological invasion of extramammary Paget's disease lesions.

J Eur Acad Dermatol Venereol 2022 Aug 15;36(8):1235-1245. Epub 2022 Apr 15.

Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.

Background: Vertical invasion of extramammary Paget's disease (EMPD) is associated with poor prognosis. The usual vertical invasion route is directly downward or along the skin appendages. High-frequency ultrasound (HFUS) can be used to measure the EMPD lesion thickness, and visualize the pseudopod extensions due to skin appendage involvement. Read More

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Predicting the trabecular bone apparent stiffness tensor with spherical convolutional neural networks.

Bone Rep 2022 Jun 7;16:101179. Epub 2022 Mar 7.

KTH Royal Institute of Technology, Department of Biomedical Engineering and Health Systems, Sweden.

The apparent stiffness tensor is relevant for characterizing trabecular bone quality. Previous studies have used morphology-stiffness relationships for estimating the apparent stiffness tensor. In this paper, we propose to train (SphCNNs) to estimate this tensor. Read More

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Formation mechanism of blemishes in a fiber-optic imaging element.

Appl Opt 2022 Mar;61(8):1947-1957

A rigid fiber-optic imaging element with high fidelity, high resolution, and high contrast is applied in low-level-light night vision and particle detection devices. Any optical fiber in elements is an image transmission unit. However, the independence and integrity of image transmission are disturbed constantly, resulting in blemishes. Read More

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Stacking polymer microspheres matrix: a facile, practical, and energy-saving strategy for suppression of acid mist.

Environ Technol 2022 Feb 19:1-9. Epub 2022 Feb 19.

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, People's Republic of China.

The electroplating, electrolysis, and pickling industrial processes would generate numerous gas pollutes, acid mist, which could not be essentially diminished due to its synthesis mechanism and cause gaseous environmental pollution, equipment corrosion, and endanger workers' health. In this study, a facile, practical, and energy-saving acid mist suppression system was constructed by introducing a stacking microsphere matrix as a floating porous phase on the acid solution and not causing secondary pollution. The mechanism of this green acid mist suppression strategy mainly focused on size-selective blocking of acid mist droplets by dense stacking microsphere layer and dissipation of floating kinetic energy of bubbles in the acid mist. Read More

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February 2022

Optimization of pediatric FDG-PET/CT examinations based on physical indicators using the SiPM-PET/CT system.

Nucl Med Commun 2022 Apr;43(4):433-441

Office of Radiation Technology, Keio University Hospital.

Objective: This study aimed to investigate the appropriate Silicon photomultiplier -PET/CT acquisition and image reconstruction conditions for each age group.

Methods: The original phantom was developed to reflect the thickness and width of the torso in each age group (neonates, 1-year-olds, 5-year-olds, 10-year-olds, 15-year-olds, and adults). The ratio of hot spheres to background radioactivity was 4:1, and the radioactivity concentration was adjusted according to the Japanese consensus guidelines for appropriate implementation of pediatric nuclear medicine examinations. Read More

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Thermodynamic Picture of Phase Segregation during the Formation of Bicontinuous Concentric Lamellar () Silica.

Langmuir 2022 Feb 18;38(4):1368-1379. Epub 2022 Jan 18.

Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan.

The thermodynamic picture describing the formation mechanism of bicontinuous concentric lamellar () nanostructured silica particles, silica, was investigated thoroughly. A series of classical kinetics of silica by varying the synthesis time were employed to observe the morphological evolution of silica. The formation mechanism of silica is proposed as the hydrolysis and condensation reactions in the reverse micelle, followed by the phase segregation process. Read More

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February 2022

The utility of contact lens-assisted corneal cross-linking (CACXL) in progressive keratoconus patients with thin corneas.

Eur J Ophthalmol 2022 Jan 10:11206721211070915. Epub 2022 Jan 10.

Kaskaloglu Eye Hospital, Izmir, Turkey.

Purpose: To evaluate efficacy and safety of contact lens-assisted corneal cross-linking (CACXL) among progressive keratoconus patients with thin corneas.

Setting: Private eye hospital.

Design: Cross-sectional study. Read More

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January 2022

Stabilization of refractive error and associated factors following small incision phacoemulsification cataract surgery.

BMC Ophthalmol 2022 Jan 6;22(1):13. Epub 2022 Jan 6.

Division of Ophthalmology, University of Calgary, 49 Richard Way SW, Calgary, AB, T3E 7M8, Canada.

Background: Accumulating evidence suggests that refractive stabilization occurs rapidly following small incision cataract surgery. Nonetheless, many guidelines still suggest waiting four to 6 weeks before prescribing corrective lenses. This study was undertaken to supplement the existing literature regarding refractive stabilization, and evaluate multiple contributing factors that could dissuade clinicians from confidently correcting refractive error in the early post-operative course following routine cataract surgeries. Read More

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January 2022

Microdosimetric characterization of a clinical proton therapy beam: comparison between simulated lineal energy distributions in spherical water targets and experimental measurements with a silicon detector.

Phys Med Biol 2022 01 17;67(1). Epub 2022 Jan 17.

Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, Mol, Belgium.

. Treatment planning based on computer simulations wasproposed to account for the increased relative biological effectiveness (RBE) of proton radiotherapy beams near to the edges of the irradiated volume. Since silicon detectors could be used to validate the results of these simulations, it is important to explore the limitations of this comparison. Read More

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January 2022

Carbon nanospike coated nanoelectrodes for measurements of neurotransmitters.

Faraday Discuss 2022 04 5;233(0):303-314. Epub 2022 Apr 5.

Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA.

Carbon nanoelectrodes enable the detection of neurotransmitters at the level of single cells, vesicles, synapses and small brain structures. Previously, the etching of carbon fibers and 3D printing based on direct laser writing have been used to fabricate carbon nanoelectrodes, but these methods lack the ability of mass manufacturing. In this paper, we mass fabricate carbon nanoelectrodes by growing carbon nanospikes (CNSs) on metal wires. Read More

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Crystallizing Sub 10 nm Covalent Organic Framework Thin Films via Interfacial-Residual Concomitance.

J Am Chem Soc 2021 Dec 2;143(49):20916-20926. Epub 2021 Dec 2.

Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India.

Synthesis of covalent organic framework (COF) thin films on different supports with high crystallinity and porosity is crucial for their potential applications. We have designed a new synchronized methodology, residual crystallization (RC), to synthesize sub 10 nm COF thin films. These residual crystallized COF thin films showcase high surface area, crystallinity, and conductivity at room temperature. Read More

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December 2021

Extraordinary transmission of gold-capped sphere arrays in mid-infrared range.

Opt Express 2021 Oct;29(22):35191-35205

We report an extraordinary transmission (EOT) of gold-capped silica microsphere monolayers in the mid-infrared range of 5-25 μm. The observed transmittance is significantly greater than that of a flat gold film with the same thickness, although the surface of the microsphere monolayer appeared to be completely covered with gold when observing from above. The calculations based on the finite difference time domain method indicate that light passes through the openings between the gold coating on the substrate and that on the microspheres. Read More

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October 2021

Temperature Effects on the Compressive Behaviors of Closed-Cell Copper Foams Prepared by Powder Metallurgy.

Materials (Basel) 2021 Oct 26;14(21). Epub 2021 Oct 26.

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

A fabrication technology of closed-cell copper foams (CCCFs) based on powder metallurgy is proposed, by using the expanded polystyrene foams (EPS) spheres with the prescribed diameter as the space holder before sintering. The material characterization and the quasi-static compressive behaviors of both uniform and graded CCCFs at different temperatures were experimentally studied. A high temperature weakens the initial compressive modulus, plateau stress, and effective energy absorption for both uniform and graded CCCFs; meanwhile, the onset strain of densification and the maximum energy absorption efficiency are less sensitive to temperature, especially for the graded CCCFs. Read More

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October 2021

Stochastic Navier-Stokes Equations on a Thin Spherical Domain.

Appl Math Optim 2021 11;84(2):1971-2035. Epub 2020 Jul 11.

School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052 Australia.

Incompressible Navier-Stokes equations on a thin spherical domain along with free boundary conditions under a random forcing are considered. The convergence of the martingale solution of these equations to the martingale solution of the stochastic Navier-Stokes equations on a sphere as the thickness converges to zero is established. Read More

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