5,803 results match your criteria obtaining measurements


Deep learning for the automation of particle analysis in catalyst layers for polymer electrolyte fuel cells.

Nanoscale 2021 Nov 30. Epub 2021 Nov 30.

Theory and Computation of Energy Materials (IEK-13), Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

The rapidly growing use of imaging infrastructure in the energy materials domain drives significant data accumulation in terms of their amount and complexity. The applications of routine techniques for image processing in materials research are often , indiscriminate, and empirical, which renders the crucial task of obtaining reliable metrics for quantifications obscure. Moreover, these techniques are expensive, slow, and often involve several preprocessing steps. Read More

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November 2021

Impedance Spectroscopy of Metal Halide Perovskite Solar Cells from the Perspective of Equivalent Circuits.

Chem Rev 2021 Nov 30. Epub 2021 Nov 30.

Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain.

Impedance spectroscopy (IS) provides a detailed understanding of the dynamic phenomena underlying the operation of photovoltaic and optoelectronic devices. Here we provide a broad summary of the application of IS to metal halide perovskite materials, solar cells, electrooptic and memory devices. IS has been widely used to characterize perovskite solar cells, but the variability of samples and the presence of coupled ionic-electronic effects form a complex problem that has not been fully solved yet. Read More

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November 2021

A short primer on lung stereology.

Respir Res 2021 Nov 27;22(1):305. Epub 2021 Nov 27.

Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany.

The intention of this short primer is to raise your appetite for proper quantitative assessment of lung micro-structure. The method of choice for obtaining such data is stereology. Rooted in stochastic geometry, stereology provides simple and efficient tools to obtain quantitative three-dimensional information based on measurements on nearly two-dimensional microscopic sections. Read More

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November 2021

Living Bacteria Directly Embedded into Electrospun Nanofibers: Design of New Anode for Bio-Electrochemical Systems.

Nanomaterials (Basel) 2021 Nov 16;11(11). Epub 2021 Nov 16.

Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.

The aim of this work is the optimization of electrospun polymeric nanofibers as an ideal reservoir of mixed electroactive consortia suitable to be used as anodes in Single Chamber Microbial Fuel Cells (SCMFCs). To reach this goal the microorganisms are directly embedded into properly designed nanofibers during the electrospinning process, obtaining so called nanofiber-based bio-composite (bio-NFs). This research approach allowed for the designing of an advanced nanostructured scaffold, able to block and store the living microorganisms inside the nanofibers and release them only after exposure to water-based solutions and electrolytes. Read More

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November 2021

Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index.

Sensors (Basel) 2021 Nov 19;21(22). Epub 2021 Nov 19.

Image Processing Systems Institute of RAS-Branch of the Federal Scientific Research Centre Crystallography and Photonics of Russian Academy of Sciences, 151 Molodogvardeyskaya St., 443001 Samara, Russia.

We propose a novel type of spectral diffractive lenses that operate in the ±1-st diffraction orders. Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and -1-st diffraction orders. The spectral lenses are convenient to use for obtaining remotely sensed vegetation index images instead of full-fledged hyperspectral images. Read More

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November 2021

A Two-Filter Approach for State Estimation Utilizing Quantized Output Data.

Sensors (Basel) 2021 Nov 18;21(22). Epub 2021 Nov 18.

Departamento Electrónica, Universidad Técnica Federico Santa María (UTFSM), Av. España 1680, Valparaíso 2390123, Chile.

Filtering and smoothing algorithms are key tools to develop decision-making strategies and parameter identification techniques in different areas of research, such as economics, financial data analysis, communications, and control systems. These algorithms are used to obtain an estimation of the system state based on the sequentially available noisy measurements of the system output. In a real-world system, the noisy measurements can suffer a significant loss of information due to (among others): (i) a reduced resolution of cost-effective sensors typically used in practice or (ii) a digitalization process for storing or transmitting the measurements through a communication channel using a minimum amount of resources. Read More

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November 2021

Environmental Monitoring of the Littoral Zone of Lake Baikal Using a Network of Automatic Hydro-Meteorological Stations: Development and Trial Run.

Sensors (Basel) 2021 Nov 18;21(22). Epub 2021 Nov 18.

Limnological Institute, Siberian Branch of the Russian Academy of Sciences, 664033 Irkutsk, Russia.

An automatic hydro-meteorological station (AHMS) was designed to monitor the littoral zone of Lake Baikal in areas with high anthropogenic pressure. The developed AHMS was installed near the Bolshiye Koty settlement (southern basin). This AHMS is the first experience focused on obtaining the necessary competencies for the development of a monitoring network of the Baikal natural territory. Read More

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November 2021

Study on LT Accuracy Improvement by Calibration Based on Network Measurements.

Sensors (Basel) 2021 Nov 10;21(22). Epub 2021 Nov 10.

Design and Manufacturing Engineering Department, University of Zaragoza, 50018 Zaragoza, Spain.

Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. Read More

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November 2021

Microfibrillated Cellulose Grafted with Metacrylic Acid as a Modifier in Poly(3-hydroxybutyrate).

Polymers (Basel) 2021 Nov 17;13(22). Epub 2021 Nov 17.

Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania.

This work proposes a new method for obtaining poly(3-hydroxybutyrate) (PHB)/microfibrillated cellulose (MC) composites with more balanced properties intended for the substitution of petroleum-based polymers in packaging and engineering applications. To achieve this, the MC surface was adjusted by a new chemical route to enhance its compatibility with the PHB matrix: (i) creating active sites on the surface of MC with γ-methacryloxypropyltrimethoxysilane (SIMA) or vinyltriethoxysilane (SIV), followed by (ii) the graft polymerization of methacrylic acid (MA). The high efficiency of the SIMA-MA treatment and the lower efficiency in the case of SIV-MA were proven by the changes observed in the Fourier transform infrared FTIR spectra of celluloses. Read More

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November 2021

Establishing Irreversible Electroporation Electric Field Potential Threshold in A Suspension In Vitro Model for Cardiac and Neuronal Cells.

J Clin Med 2021 Nov 22;10(22). Epub 2021 Nov 22.

Physiology and Cellular Physiology Research Laboratory, School of Medicine, Human Biology Building, National University of Ireland, H91 TK33 Galway, Ireland.

Aims: Irreversible electroporation is an ablation technique being adapted for the treatment of atrial fibrillation. Currently, there are many differences reported in the in vitro and pre-clinical literature for the effective voltage threshold for ablation. The aim of this study is a direct comparison of different cell types within the cardiovascular system and identification of optimal voltage thresholds for selective cell ablation. Read More

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November 2021

Developing a Technique for the Imaging-Based Measurement of ACL Elongation: A Proof of Principle.

Diagnostics (Basel) 2021 Nov 16;11(11). Epub 2021 Nov 16.

Research Unit for Orthopaedic Sports Medicine and Injury Prevention, UMIT Tirol, 6060 Hall, Austria.

Towards the goal of obtaining non-invasive biomarkers reflecting the anterior cruciate ligament's (ACL) loading capacity, this project aimed to develop a magnetic resonance imaging (MRI)-based method facilitating the measurement of ACL elongations during the execution of knee stress tests. An MRI-compatible, computer-controlled, and pneumatically driven knee loading device was designed to perform Lachman-like tests and induce ACL strain. A human cadaveric leg was used for test purposes. Read More

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November 2021

Investigations of association among atmospheric radionuclide measurements.

J Environ Radioact 2021 Nov 23;241:106777. Epub 2021 Nov 23.

Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA, 99354, USA. Electronic address:

Large networks producing frequent atmospheric radionuclide measurements have additional power in characterizing and localizing radionuclide release events over the analysis performed with four or fewer radionuclide measurements. However, adding unrelated measurements to an analysis dilutes that advantage, unless source-term models are extended to account for this complexity. A key steppingstone to obtaining network power is to select a group of related sample measurements that are associated with a release event. Read More

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November 2021

Bridge-Length- and Solvent-Dependent Charge Separation and Recombination Processes in Donor-Bridge-Acceptor Molecules.

J Phys Chem B 2021 Nov 23. Epub 2021 Nov 23.

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The photoinduced intramolecular charge separation (CS) and charge recombination (CR) phenomena in a series of donor-bridge-acceptor (D-B-A) molecules are intensively investigated as a means of understanding electron transport through the π-B. Pyrene (Pyr) and triarylamine (TAA) moieties connected via phenylene Bs of various lengths are studied because their CS and CR behaviors can be readily monitored in real time by femtosecond transient absorption (fs-TA) spectroscopy. By combining the steady-state and fs-TA spectroscopic measurements in a variety of solvents together with chemical calculations, the parameters that govern the CS behaviors of these dyads were obtained, such as the solvent effects on free energy and the B-length-dependent electronic coupling () between D and A. Read More

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November 2021

Primary facility for traceable measurement of the BSSRDF.

Opt Express 2021 Oct;29(21):34175-34188

The bidirectional scattering-surface reflectance distribution function (BSSRDF) is the function that describes the variation of the radiance of the elementary areas of a surface with respect to the directionally incident radiant flux on that surface. Measurements of the BSSRDF are important for characterizing the translucency of objects and for obtaining those optical parameters affecting volume scattering. However, to date, no traceable measurements of this function are available, since, likely due to its technical complexity, no standard measurement procedure has been established. Read More

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October 2021

Optimization of a DIY parallel-optical-axes profilometer for compensation of fringe divergence.

Authors:
J A Rayas A Dávila

Appl Opt 2021 Nov;60(31):9790-9798

In profilometry systems, the conventional optical configuration of fringe projection with the oblique projection and camera axis perpendicular to the field of view requires complicated calculus and exact ray trace designs to get the 3D shape under question accurately. Moreover, when the optical components of the camera and projector and their internal placement are unknown, as is the case with commercial digital video projectors, the correct alignment of these components is uncertain, needing complex methods of calibration to correct the measured shape. In this work, we re-introduce a parallel-optical-axes configuration for a DIY profilometer that simplifies the calibration by a simple trigonometric relationship obtaining the topography with a resolution and accuracy similar to conventional arrangements that require non-simple relationships among phase and height. Read More

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November 2021

Objective falls-risk prediction using wearable technologies amongst patients with and without neurogenic gait alterations: a narrative review of clinical feasibility.

Mhealth 2021 20;7:61. Epub 2021 Oct 20.

Department of Medicine, University of New South Wales, Sydney, Australia.

Objectives: The present narrative review aims to collate the literature regarding the current use of wearable gait measurement devices for falls-risk assessment in neurological and non-neurological populations. Thereby, this review seeks to determine the extent to which the aforementioned barriers inhibit clinical use.

Background: Falls contribute a significant disease burden in most western countries, resulting in increased morbidity and mortality with substantial therapeutic costs. Read More

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October 2021

Lipid measurements in the management of cardiovascular diseases: Practical recommendations a scientific statement from the national lipid association writing group.

J Clin Lipidol 2021 Sep 24. Epub 2021 Sep 24.

National Heart, Lung and Blood Institute, Bethesda, MD, United States.

Lipoprotein measurements are pivotal in the management of patients at risk for atherosclerotic coronary heart disease (CHD) with myocardial infarction and coronary death as the main outcomes, and for atherosclerotic cardiovascular disease (ASCVD), which includes CHD and stroke. Recent developments and changes in guidelines affect optimization of using lipid measures as cardiovascular biomarkers. This scientific statement reviews the pre-analytical, analytical, post-analytical, and clinical aspects of lipoprotein measurements. Read More

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September 2021

The role of tricuspite annular plane systolic excursion as a marker of hypovolemia in healthy blood donor volunteers.

Am J Emerg Med 2021 Oct 23;51:320-324. Epub 2021 Oct 23.

Izmir Bozyaka Training and Resarch Hospital, Department of Emergency Medicine, İzmir, TURKEY.

Aim: The aim of this study is to compare the diameter of the inferior vena cava with tricuspid annular plane systolic excursion (TAPSE) measurement in order to determine the volume loss before and after blood donation in healthy volunteers.

Methods: This Institutional Review Board-approved single center, prospective, cross-sectional study included 60 healthy blood donors donating in a tertiary care hospital's blood bank. After obtaining written consent, systolic, diastolic, and mean arterial blood pressures along with pulse rate of the donors were measured in sitting and supine positions by the attending physician, then, inferior vena cava (IVC) and TAPSE measurements were made before and after blood donation. Read More

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October 2021

Evaluation of a micro ionization chamber for dosimetric measurements in image-guided preclinical irradiation platforms.

Phys Med Biol 2021 Nov 18. Epub 2021 Nov 18.

Medical, Marine & Nuclear: Medical Radiation Physics&Sciences, National Physical Laboratory, Teddington, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

Image-guided small animal irradiation platforms deliver small radiation fields in the medium energy x-ray range. Commissioning of such platforms, followed by dosimetric verification of treatment planning, are mostly performed with radiochromic film. There is a need for independent measurement methods, traceable to primary standards, with the added advantage of immediacy in obtaining results. Read More

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November 2021

Immune Plasma Algorithm: A Novel Meta-Heuristic for Optimization Problems.

IEEE Access 2020 7;8:220227-220245. Epub 2020 Dec 7.

Department of Computer EngineeringOndokuz Mayıs University 55200 Samsun Turkey.

The recent global health crisis also known as the COVID-19 or coronavirus pandemic has attracted the researchers' attentions to a treatment approach called immune plasma or convalescent plasma once more again. The main idea lying behind the immune plasma treatment is transferring the antibody rich part of the blood taken from the patients who are recovered previously to the critical individuals and its efficiency has been proven by successfully using against great influenza of 1918, H1N1 flu, MERS, SARS and Ebola. In this study, we modeled the mentioned treatment approach and introduced a new meta-heuristic called Immune Plasma (IP) algorithm. Read More

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December 2020

Blood loss estimation during posterior spinal fusion for adolescent idiopathic scoliosis.

Spine Deform 2021 Nov 16. Epub 2021 Nov 16.

Department of Anesthesiology, Children's Healthcare of Atlanta, Atlanta, GA, USA.

Purpose: Blood loss (BL) during posterior spinal fusion for adolescent idiopathic scoliosis (AIS) may be estimated using a variety of unproven techniques. Patient care and research on BL are likely impacted by a lack of standardization. A novel FDA-approved blood volume (BV) analysis system (BVA-100 Blood Volume Analyzer) allows rapid processing with > 97% accuracy. Read More

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November 2021

Proliferation of Tau 304-380 Fragment Aggregates through Autocatalytic Secondary Nucleation.

ACS Chem Neurosci 2021 Nov 16. Epub 2021 Nov 16.

Department of Biochemistry and Structural Biology, Chemical Centre, Lund University, SE-221 00 Lund, Sweden.

The self-assembly of the protein tau into neurofibrillary tangles is one of the hallmarks of Alzheimer's disease and related tauopathies. Still, the molecular mechanism of tau aggregation is largely unknown. This problem may be addressed by systematically obtaining reproducible in vitro kinetics measurements under quiescent conditions in the absence of triggering substances. Read More

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November 2021

Evaluating Patellofemoral Patients: Physical Examination, Radiographic Imaging, and Measurements.

Clin Sports Med 2022 Jan;41(1):1-13

Department of Orthopaedic Surgery, Johns Hopkins Outpatient Center, 601 North Caroline Street, 5th Floor, Baltimore, MD 21287, USA. Electronic address:

Patellofemoral pain is one of the most common symptoms of patients presenting to sports medicine clinics. Obtaining a pertinent history and performing a thorough examination is crucial to identifying the subset of patients with instability who are most likely to benefit from surgical stabilization. A comprehensive radiographic work-up that includes standard radiographs and advanced imaging helps elucidate the diagnosis and provides crucial information for preoperative planning. Read More

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January 2022

Combination of Exhaled Breath Analysis with Parallel Lung Function and FeNO Measurements in Infants.

Anal Chem 2021 Nov 15;93(47):15579-15583. Epub 2021 Nov 15.

University of Basel Children's Hospital (UKBB), Basel 4056, Switzerland.

Breath analysis by secondary electrospray ionization-high resolution mass spectrometry (SESI-HRMS) offers the possibility to measure comprehensive metabolic profiles. The technology is currently being deployed in several clinical settings in Switzerland and China. However, patients are required to exhale directly into the device located in a dedicated room. Read More

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November 2021

Comparison of two-dimensional (2D) and three-dimensional (3D) ultrasonography for gestational ageing in the early to mid-pregnant bitch.

Reprod Domest Anim 2021 Nov 14. Epub 2021 Nov 14.

Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.

Accuracy of prediction of the day of parturition in the bitch decreases with advancing pregnancy. We hypothesized that three-dimensional (3D) volume ultrasonography may be superior for gestational ageing than 2D measurements. Thirty-two pregnancy examinations were performed in 25 bitches of different breeds 21-34 days after the first mating. Read More

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November 2021

Extracting Charge Carrier Diffusion Parameters in Perovskite Solar Cells with Light Modulated Techniques.

ACS Energy Lett 2021 Jun 24;6(6):2248-2255. Epub 2021 May 24.

Institute of Advanced Materials (INAM), Universitat Jaume I, Avda. Sos Baynat sn, 12006 Castelló, Spain.

Frequency resolved methods are widely used to determine device properties of perovskite solar cells. However, obtaining the electronic parameters for diffusion and recombination by impedance spectroscopy has been so far elusive, since the measured spectra do not present the diffusion of electrons. Here we show that intensity modulated photocurrent spectroscopy (IMPS) displays a high frequency spiraling feature determined by the diffusion-recombination constants, under conditions of generation of carriers far from the collecting contact. Read More

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Multi-class deep learning segmentation and automated measurements in periodontal sonograms of a porcine model.

Dentomaxillofac Radiol 2021 Nov 23:20210363. Epub 2021 Nov 23.

Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, Michigan, United States of America.

Objectives: Ultrasound emerges as a complement to cone-beam computed tomography in dentistry, but struggles with artifacts like reverberation and shadowing. This study seeks to help novice users recognize soft tissue, bone, and crown of a dental sonogram, and automate soft tissue height (STH) measurement using deep learning.

Methods: In this retrospective study, 627 frames from 111 independent cine loops of mandibular and maxillary premolar and incisors collected from our porcine model ( = 8) were labeled by a reader. Read More

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November 2021

High-resolution imaging and identification of biomolecules using Nano-DESI coupled to ion mobility spectrometry.

Anal Chim Acta 2021 Nov 21;1186:339085. Epub 2021 Sep 21.

Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA. Electronic address:

Simultaneous spatial localization and structural characterization of molecules in complex biological samples currently represents an analytical challenge for mass spectrometry imaging (MSI) techniques. In this study, we describe a novel experimental platform, which substantially expands the capabilities and enhances the depth of chemical information obtained in high spatial resolution MSI experiments performed using nanospray desorption electrospray ionization (nano-DESI). Specifically, we designed and constructed a portable nano-DESI MSI platform and coupled it with a drift tube ion mobility (IM) spectrometer-mass spectrometer. Read More

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November 2021

A simple method for getting standard error on the ratiometric calcium estimator.

MethodsX 2021 22;8:101548. Epub 2021 Oct 22.

Institute for Zoology, Biocenter and Cologne Excellence Cluster in Aging Associated Diseases (CECAD), University of Cologne, Cologne, Germany.

The ratiometric fluorescent calcium indicator Fura-2 plays a fundamental role in the investigation of cellular calcium dynamics. Despite of its widespread use in the last 30 years, only one publication (Joucla et al., 2010)) proposed a way of obtaining confidence intervals on fitted calcium dynamic model parameters from single 'calcium transients'. Read More

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October 2021

Morphometric measurements of safety zones and orientation angles for freehand placement of revision screws in atlas lateral mass.

Turk Neurosurg 2021 May 17. Epub 2021 May 17.

Lokman Hekim University, School of Medicine, Department of Neurosurgery, Ankara, Turkey.

Aim: To demonstrate the possibility of revision screw placement to the atlas, as well as define the safety zones and orientation angles.

Material And Methods: This retrospective study analysed the records of four patients who were operated for AAI earlier. Because they needed revision of Atlas screws, they were re-operated after obtaining the measurements mentioned in this study. Read More

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