29,133 results match your criteria high-speed amplification


Optic nerve mobilization as an alternative to anterior clinoidectomy in superior carotid-ophthalmic aneurysms: Operative technique.

World Neurosurg 2021 Jun 12. Epub 2021 Jun 12.

Department of Neurosurgery, Padilla Hospital, Tucumán, Argentina.

Background: Carotid-ophthalmic aneurysms arise from the internal carotid artery between the distal dural ring and the origin of the posterior communicating artery. The surgical treatment of these aneurysms usually requires an anterior clinoidectomy. However, this procedure is not without complications. Read More

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High-speed computer-generated holography using an autoencoder-based deep neural network.

Opt Lett 2021 Jun;46(12):2908-2911

Learning-based computer-generated holography (CGH) provides a rapid hologram generation approach for holographic displays. Supervised training requires a large-scale dataset with target images and corresponding holograms. We propose an autoencoder-based neural network (holoencoder) for phase-only hologram generation. Read More

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Experimental investigation of 16.6 Gbps SDM-WDM visible light communication based on a neural network receiver and tricolor mini-LEDs.

Opt Lett 2021 Jun;46(12):2888-2891

Visible light communication (VLC) based on a light-emitting diode (LED) suffers from a limited bandwidth of commercial LED, device nonlinearity, channel distortion, and transmitted power caused by a complex free-space channel, power amplifier, and illuminant devices resulting in a limited data rate. In this Letter, to provide an alternative high-speed solution, we first designed and fabricated three 175 µm tricolor mini-LEDs with various wavelengths. They are used to set up a spatial division multiplexing-wavelength division multiplexing VLC system over a 2 m link. Read More

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40 GHz high-efficiency Michelson interferometer modulator on a silicon-rich nitride and thin-film lithium niobate hybrid platform.

Opt Lett 2021 Jun;46(12):2811-2814

We propose and demonstrate a Michelson interferometer modulator with integrated Bragg reflectors on a silicon-rich nitride-thin-film lithium niobate hybrid platform. High-reflectivity Bragg reflectors are placed at the ends of both arms, which double the electro-optic (E-O) interaction length and reduce the velocity mismatch between the microwave and optical wave. The presented Michelson interferometer modulator achieves a measured half-wave voltage length product as low as 1. Read More

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Volume and Intensity of Locomotor Activity in International Men's Field Hockey Matches Over a 2-Year Period.

Front Sports Act Living 2021 28;3:653364. Epub 2021 May 28.

Cambridge Center for Sport and Exercise Sciences, Anglia Ruskin University, Cambridge, United Kingdom.

The locomotor demands of international men's field hockey matches were investigated across positions (DEF, MID, FWD) and playing quarters. Volume (i.e. Read More

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Effect of playing position, passage duration and starting status on the most demanding passages of match play in professional football.

Res Sports Med 2021 Jun 14:1-10. Epub 2021 Jun 14.

Health Research Centre, University of Almería, Almería, Spain.

The aims of this research were to analyse the effect that different playing positions, passage durations and starting status had on the most demanding passages (MDP) of play in professional football matches. Players were categorized by positions and the MDP of distance (DIS), high-speed running distance (HSRD) and sprinting distance (SPD) were analysed for four passage durations (1, 3, 5 and 10 minutes). The results indicated that DIS ( < 0. Read More

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High-Speed Blow Spinning of Neat Graphene Fibrous Materials.

Nano Lett 2021 Jun 14. Epub 2021 Jun 14.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China.

Achieving high spinning speed is critical to the production efficiency and viable application of fiber species. Graphene fiber (GF) has recently emerged as a carbonaceous fiber with excellent functionality. However, the extremely low wet spinning speed of GF has limited its applications. Read More

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Tracking Control of Unknown and Constrained Nonlinear Systems via Neural Networks With Implicit Weight and Activation Learning.

IEEE Trans Neural Netw Learn Syst 2021 Jun 14;PP. Epub 2021 Jun 14.

For systems with irregular (asymmetric and positively-negatively alternating) constraints being imposed/removed during system operation, there is no uniformly applicable control method. In this work, a control design framework is established for uncertain pure-feedback systems subject to the aforementioned constraints. By introducing a novel transformation function and with the help of auxiliary constraining boundaries, the original output-constrained system is augmented to unconstrained one. Read More

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Down-Scalable and Ultra-fast Memristors with Ultra-high Density Three-Dimensional Arrays of Perovskite Quantum Wires.

Nano Lett 2021 Jun 14. Epub 2021 Jun 14.

Department of Electronic & Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.

With strikingly high speed, data retention ability and storage density, resistive RAMs have emerged as a forerunning nonvolatile memory. Here we developed a Re-RAM with ultra-high density array of monocrystalline perovskite quantum wires (QWs) as the switching matrix with a metallic silver conducting pathway. The devices demonstrated high ON/OFF ratio of ∼10 and ultra-fast switching speed of ∼100 ps which is among the fastest in literature. Read More

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Contactless Method for Electrocoalescence of Water in Oil.

ACS Omega 2021 Jun 28;6(22):14298-14308. Epub 2021 May 28.

Department of Electrical Engineering and Computer Science and Department of Mechanical, Industrial, and Manufacturing Engineering, The University of Toledo, Toledo, Ohio 43606, United States.

This paper discusses an experimental approach to study the effects of a contactless method on electrocoalescence of water-in-oil mixture/emulsion. A positive corona discharge is utilized using a sharp conductive needle without direct contact with the mixture/solution to avoid potential corrosion of the electrode. This creates a nonuniform electric field, which is further used for the coalescence of water droplets in the range of micro to macro in oil. Read More

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High frame rate video mosaicking microendoscope to image large regions of intact tissue with subcellular resolution.

Biomed Opt Express 2021 May 20;12(5):2800-2812. Epub 2021 Apr 20.

Department of Bioengineering, Rice University, 6100 Main Street, Houston, TX 77025, USA.

High-resolution microendoscopy (HRME) is a low-cost strategy to acquire images of intact tissue with subcellular resolution at frame rates ranging from 11 to 18 fps. Current HRME imaging strategies are limited by the small microendoscope field of view (∼0.5 mm); multiple images must be acquired and reliably registered to assess large regions of clinical interest. Read More

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Scattering oblique plane microscopy for blood cell imaging.

Biomed Opt Express 2021 May 5;12(5):2575-2585. Epub 2021 Apr 5.

Department of Biomedical Engineering, Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.

Oblique plane microscopy (OPM) enables high speed, volumetric fluorescence imaging through a single-objective geometry. While these advantages have positioned OPM as a valuable tool to probe biological questions in animal models, its potential for human imaging is largely unexplored due to its typical use with exogenous fluorescent dyes. Here we introduce a scattering-contrast oblique plane microscope (sOPM) and demonstrate label-free imaging of blood cells flowing through human capillaries . Read More

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Extremely low-frequency phonon material and its temperature- and photo-induced switching effects.

Chem Sci 2020 Aug 17;11(33):8989-8998. Epub 2020 Aug 17.

Department of Chemistry, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan

Atomic vibrations due to stretching or bending modes cause optical phonon modes in the solid phase. These optical phonon modes typically lie in the frequency range of 10 to 10 cm. How much can the frequency of optical phonon modes be lowered? Herein we show an extremely low-frequency optical phonon mode of 19 cm (0. Read More

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Comparing cleaning effects of gas and vapor bubbles in ultrasonic fields.

Ultrason Sonochem 2021 Jun 6;76:105618. Epub 2021 Jun 6.

Department of Mechanical Engineering, Sogang University, Seoul 04107, South Korea; Institute of Emergent Materials, Sogang University, Seoul 04107, South Korea. Electronic address:

The dynamic actions of cavitation bubbles in ultrasonic fields can clean surfaces. Gas and vapor cavitation bubbles exhibit different dynamic behaviors in ultrasonic fields, yet little attention has been given to the distinctive cleaning effects of gas and vapor bubbles. We present an experimental investigation of surface cleaning by gas and vapor bubbles in an ultrasonic field. Read More

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High-speed fluoroscopic imaging for investigation of three-dimensional knee kinematics before and after marathon running.

Gait Posture 2021 Jun 8;88:231-237. Epub 2021 Jun 8.

Key Laboratory of Exercise and Health Sciences of Ministry of Education, School of Kinesiology, Shanghai University of Sport, Shanghai, China. Electronic address:

Background: Knee injuries often occur during or shortly after marathon running, and are linked to altered knee kinematics.

Research Question: The kinematics of healthy knees during pre- and post-marathon running have not been examined with high-speed fluoroscopy. This study aimed to evaluate the effects of marathon running on knee kinematics during walking and running by using a combined high-speed fluoroscopy and MRI technique. Read More

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Acoustic resonance and atomization for gas-liquid systems in microreactors.

Ultrason Sonochem 2021 Jun 1;75:105611. Epub 2021 Jun 1.

KU Leuven, Department of Chemical Engineering, Celestijnenlaan 200F, 3001 Leuven, Belgium. Electronic address:

It is shown that a liquid slug in gas-liquid segmented flow in microchannels can act as an acoustic resonator to disperse large amounts of small liquid droplets, commonly referred to as atomization, into the gas phase. We investigate the principles of acoustic resonance within a liquid slug through experimental analysis and numerical simulation. A mechanism of atomization in the confined channels and a hypothesis based on high-speed image analysis that links acoustic resonance within a liquid slug with the observed atomization is proposed. Read More

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Application of MALDI-TOF analysis to reveal diversity and dynamics of winemaking yeast species in wild-fermented, organically produced, New Zealand Pinot Noir wine.

Food Microbiol 2021 Oct 17;99:103824. Epub 2021 May 17.

Department of Wine, Food and Molecular Biosciences, Lincoln University, PO Box 85054, Lincoln, New Zealand. Electronic address:

Rapid yeast identification is of particular importance in monitoring wine fermentation and assessing strain application in winemaking. We used MALDI-TOF MS analysis supported by 26 S rRNA gene sequence analysis and Saccharomyces-specific PCR testing to differentiate reference and field strains recovered from organic wine production facilities in Waipara, New Zealand, in which Pinot Noir wine was produced by spontaneous fermentations in the vineyard and in the winery. Strains were isolated from each of four key stages of each ferment to evaluate changes in taxonomic diversity. Read More

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October 2021

Variation in the content and fluorescent composition of dissolved organic matter in soil water during rainfall-induced wetting and extract of dried soil.

Sci Total Environ 2021 Jun 9;791:148296. Epub 2021 Jun 9.

College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, PR China. Electronic address:

Dissolved organic matter (DOM) is present in all soils, providing a readily available carbon source for microorganisms, which influences microbially mediated biogeochemical processes. Rainfall-induced wetting can alter the content and composition of soil DOM. However, conventional methods commonly used to extract DOM from soils involve air- or oven-drying followed by extraction with water, and the results vary considerably in terms of indexes used. Read More

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Continuous downstream processing of milled electrospun fibers to tablets monitored by near-infrared and Raman spectroscopy.

Eur J Pharm Sci 2021 Jun 9;164:105907. Epub 2021 Jun 9.

Department of Organic Chemistry and Technology, Budapest University of Technology and Economics (BME), H-1111, Budapest, Műegyetem rakpart 3, Hungary. Electronic address:

Electrospinning is a technology for manufacture of nano- and micro-sized fibers, which can enhance the dissolution properties of poorly water-soluble drugs. Tableting of electrospun fibers have been demonstrated in several studies, however, continuous manufacturing of tablets have not been realized yet. This research presents the first integrated continuous processing of milled drug-loaded electrospun materials to tablet form supplemented by process analytical tools for monitoring the active pharmaceutical ingredient (API) content. Read More

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Torsional fracture of viscoelastic liquid bridges.

Proc Natl Acad Sci U S A 2021 Jun;118(24)

Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan;

Short liquid bridges are stable under the action of surface tension. In applications like electronic packaging, food engineering, and additive manufacturing, this poses challenges to the clean and fast dispensing of viscoelastic fluids. Here, we investigate how viscoelastic liquid bridges can be destabilized by torsion. Read More

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Role of Interfacial Tension on Viscous Multiphase Flows in Coaxial Microfluidic Channels.

Langmuir 2021 Jun 11. Epub 2021 Jun 11.

Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794, United States.

We experimentally investigate the influence of interfacial tension on liquid/liquid microflows for fluids having large viscosity contrasts. A coaxial microdevice is employed to examine the situation where a less-viscous fluid is injected in a sheath of a more-viscous fluid using both immiscible and miscible fluid pairs. Data obtained from high-speed imaging reveal a variety of regular flow regimes, including dripping, jetting, wavy, core-annular, diffusive jet, mist, and inverted thread flow patterns. Read More

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Investigation of droplets released during digestive endoscopy using a high-speed camera (with video): a pilot study.

Surg Endosc 2021 Jun 11. Epub 2021 Jun 11.

Department of Gastroenterology, Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.

Background: A large release of droplets is often expected around the periphery of the digestive endoscope insertion site. Therefore, a sense of alarm over infection because of droplets that may be released during digestive endoscopy examination is increasing. This study aimed to investigate the droplets released during digestive endoscopy using a high-speed camera. Read More

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Dural Tear During Thoracic Laminectomy Using Craniotome With Footplate Attachment.

Cureus 2021 May 7;13(5):e14893. Epub 2021 May 7.

Division of Neurosurgery, Maimonides Medical Center, Brooklyn, USA.

Laminectomy can be accomplished using the craniotome with a footplate attachment, and the technique has been advanced as a superior alternative to using a high-speed drill-driven burr and Kerrison rongeurs. Laminectomy can be accomplished more rapidly and with less bone destruction, an advantage when planning laminoplasty. There is, however, scant literature describing complications of dural laceration using this technique. Read More

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Analysis of fracture deformation field and energy evolution of granite after high confining pressure cyclic load pre-damage.

R Soc Open Sci 2021 Jun 9;8(6):201966. Epub 2021 Jun 9.

School of Resources and Safety Engineering, Central South University, Changsha, People's Republic of China.

Considering the recent developments of deep mining, investigating the rock properties under high ground stress periodic load is highly demanded. Studies show that these characteristics are important factors affecting the long-term steadiness of rock. However, the mechanical properties of rock mass without macro failure after cyclic load should be studied. Read More

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A full-parallel implementation of Self-Organizing Maps on hardware.

Neural Netw 2021 May 21. Epub 2021 May 21.

Laboratory of Machine Learning and Intelligent Instrumentation, IMD/nPITI - Federal University of Rio Grande do Norte, Natal, Brazil; Department of Computer and Automation Engineering - Federal University of Rio Grande do Norte, Natal, Brazil. Electronic address:

Self-Organizing Maps (SOMs) are extensively used for data clustering and dimensionality reduction. However, if applications are to fully benefit from SOM based techniques, high-speed processing is demanding, given that data tends to be both highly dimensional and yet "big". Hence, a fully parallel architecture for the SOM is introduced to optimize the system's data processing time. Read More

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Time-domain NMR analysis for the determination of water content in pharmaceutical ingredients and wet granules.

Int J Pharm 2021 Jun 7:120770. Epub 2021 Jun 7.

Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama-shi, Toyama, 930-0194, Japan. Electronic address:

The application of time-domain NMR (TD-NMR) analysis to quantify water content in pharmaceutical ingredients is demonstrated. The initial phase of the study employed a range of disintegrants with defined amounts of added water (0-30% of the total weight) as samples; the disintegrants included croscarmellose sodium, corn starch, low-substituted hydroxypropyl cellulose, and crospovidone. After acquisition of the T relaxation curves of the samples by TD-NMR measurements, these curves were analyzed by partial least squares (PLS) regression. Read More

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Profiling system of oral microbiota utilizing polymerase chain reaction-restriction fragment length polymorphism analysis.

J Oral Biosci 2021 Jun 7. Epub 2021 Jun 7.

Division of Clinical Chemistry, Niigata University Graduate School of Health Sciences, Niigata 951-8518, Japan. Electronic address:

Objectives: Profiling of oral microbiota has traditionally been performed using conventional methods. These methods are relatively time-consuming and labor-intensive. Metagenomic analysis of oral microbiota using high-speed next-generation sequencing is a highly promising technology. Read More

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Fluid Dynamics of the Open Port Interface for High-Speed Nanoliter Volume Sampling Mass Spectrometry.

Anal Chem 2021 Jun 10. Epub 2021 Jun 10.

SCIEX, 71 Four Valley Drive, Concord, Ontario L4K 4V8, Canada.

The open port interface (OPI) coupled to an atmospheric pressure ion source is used to capture, dilute, focus, and transport nanoliter volume sample droplets for high-speed mass spectrometric analysis. For typical applications, the system has been optimized to achieve 1 Hz nanoliter volume sample transfer rates while simultaneously diluting the sample >1000-fold to minimize sample matrix-induced ionization suppression. Geometric, flow, and dispensing alterations to the system presented here demonstrate that sample transfer rates for the OPI of at least 15 Hz are possible. Read More

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Enhancing Mechanical and Combustion Performance of Boron/Polymer Composites via Boron Particle Functionalization.

ACS Appl Mater Interfaces 2021 Jun 10. Epub 2021 Jun 10.

Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States.

High-speed air-breathing propulsion systems, such as solid fuel ramjets (SFRJ), are important for space exploration and national security. The development of SFRJ requires high-performance solid fuels with excellent mechanical and combustion properties. One of the current solid fuel candidates is composed of high-energy particles (e. Read More

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Acquisition and processing of high-speed atomic force microscopy videos for single amyloid aggregate observation.

Methods 2021 Jun 6. Epub 2021 Jun 6.

Division of Neurology, Department of Internal Medicine, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8666, Japan. Electronic address:

The structural dynamics of the amyloid protein aggregation process are associated with neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease. High-speed atomic force microscopy (HS-AFM) is able to visualize the structural dynamics of individual aggregate species that otherwise cannot be distinguished. HS-AFM observations also detect impurities in the sample, and thus, experiments require relatively high sample purity. Read More

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