1,372 results match your criteria elliptical three


Microwave Imaging of Breast Skin Utilizing Elliptical UWB Antenna and Reverse Problems Algorithm.

Micromachines (Basel) 2021 May 31;12(6). Epub 2021 May 31.

James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK.

Skin cancer is one of the most widespread and fast growing of all kinds of cancer since it affects the human body easily due to exposure to the Sun's rays. Microwave imaging has shown better outcomes with higher resolution, faster processing time, mobility, and less cutter and artifact effects. A miniaturized elliptical ultra-wideband (UWB) antenna and its semi-spherical array arrangement were used for signal transmission and reception from the defected locations in the breast skin. Read More

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Manufacturing and Characterisation of Polymeric Membranes for Water Treatment and Numerical Investigation of Mechanics of Nanocomposite Membranes.

Polymers (Basel) 2021 May 20;13(10). Epub 2021 May 20.

Faculty of Engineering, Department of Environmental Engineering, İstanbul University-Cerrahpaşa, Avcılar Kampüsü, İstanbul 34320, Turkey.

In this study, polyethersulfone (PES) and polyvinylidene fluoride (PVDF) microfiltration membranes containing polyvinylpyrrolidone (PVP) with and without support layers of 130 and 150 μm thickness are manufactured using the phase inversion method and then experimentally characterised. For the characterisation of membranes, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and pore size analysis are performed, the contact angle and water content of membranes are measured and the tensile test is applied to membranes without support layers. Using the results obtained from the tensile tests, the mechanical properties of the halloysite nanotube (HNT) and nano-silicon dioxide (nano SiO) reinforced nanocomposite membranes are approximately determined by the Mori-Tanaka homogenisation method without applying any further mechanical tests. Read More

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Flexible Electromagnetic Cap for Three-Dimensional Electromagnetic Head Imaging.

IEEE Trans Biomed Eng 2021 May 27;PP. Epub 2021 May 27.

The timely treatment is the crucial element for the survival of patients with brain stroke. Thus, a fast, cost-effective, and portable device is needed for the early and on-the-spot diagnosis of stroke patients. A 3D electromagnetic head imaging system for rapid brain stroke diagnosis with a wearable and lightweight platform is presented. Read More

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First report of Colletotrichum fructicola and Colletotrichum nymphaeae causing leaf spot on Rubus corchorifolius in Zhejiang province, China.

Plant Dis 2021 May 25. Epub 2021 May 25.

Zhejiang Academy of Agricultural Sciences, 74561, Institute of Plant Protection and Microbiology, Hangzhou, Zhejiang, China;

Rubus corchorifolius is one of the most economically important fruit trees, (Tian et al. 2021). A severe leaf spot disease on leaves of R. Read More

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Efficient sliding locomotion of three-link bodies.

Authors:
Silas Alben

Phys Rev E 2021 Apr;103(4-1):042414

Department of Mathematics, University of Michigan, Ann Arbor, Michigan 48109, USA.

We study the efficiency of sliding locomotion for three-link bodies with prescribed joint angle motions. The bodies move with no inertia, under dry (Coulomb) friction that is anisotropic (different in the directions normal and tangent to the links) and directional (different in the forward and backward tangent directions). Friction coefficient space can be partitioned into several regions, each with distinct types of efficient kinematics. Read More

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Multifunctional ultrathin reflective metasurface via polarization-decoupled phase for arbitrary circularly or elliptically polarized waves.

Opt Express 2021 Apr;29(8):12736-12749

Metasurface offers a promising platform in the design of multifunctional devices owing to its unique ability for EMWs manipulation. However, wave-manipulation capabilities for metasurfaces face challenges in manipulating orthogonal EMWs with arbitrary circularly or elliptically polarized EMWs in the microwave region. Herein, single-layer reflective metasurfaces are proposed for independent manipulation of an arbitrary set of orthogonal circularly or elliptically polarized EMWs via polarization-decoupled phase. Read More

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Morpho-Physiological Responses and Secondary Metabolites Modulation by Preharvest Factors of Three Hydroponically Grown Genovese Basil Cultivars.

Front Plant Sci 2021 26;12:671026. Epub 2021 Apr 26.

Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy.

Sweet basil ( L.) is an economically important leafy vegetable especially in Mediterranean countries. In Italian gastronomy, the large elliptical leaves of the Genovese type are mostly used for the well-known pesto sauce, and almost all (>90%) professional production is for the food industry. Read More

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First report of Plectosphaerella cucumerina causing root rot on fennel in China.

Plant Dis 2021 May 11. Epub 2021 May 11.

Gansu Agricultural University, Plant Protection, No. 1, yingmen village, anning district, lanzhou city, gansu province, LanZhon city, Gansu, China, 7330070;

Fennel (Foeniculum vulgare Mill.) is herbaceous plant commonly cultivated for culinary and medicinal uses in China (Shi et al. 2016 ). Read More

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Feasibility of motor-assisted elliptical to improve walking, fitness and balance following pediatric acquired brain injury: A case series.

J Pediatr Rehabil Med 2021 Apr 26. Epub 2021 Apr 26.

Institute for Rehabilitation Science and Engineering, Madonna Rehabilitation Hospitals, Lincoln, NE, USA.

Purpose: Walking, fitness, and balance deficits are common following acquired brain injury (ABI). This study assessed feasibility, acceptability, and usefulness of a modified motor-assisted elliptical (ICARE) in addressing walking, fitness, and balance deficits in children with chronic ABIs.

Methods: Three children (>  5 years post-ABI) completed 24 ICARE exercise sessions (exercise time, speed, and time overriding motor-assistance gradually increased) to promote mass repetition of gait-like movements and challenge cardiorespiratory fitness. Read More

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Hair diameter measurements for planning follicular unit extraction surgery (FUE): Is there a correlation between the micrometer caliper and scanning electron microscopy (SEM) findings?

J Cosmet Dermatol 2021 Apr 27. Epub 2021 Apr 27.

Department of Histology and Embryology, Faculty of Medicine, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey.

Background: Hair shaft diameter is one of the most important factors for the outcome of follicular unit extraction (FUE) surgery. In fact, the hair shaft is elliptical. Therefore, it has a long and short axis. Read More

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First Report of a Leaf Blight Caused by on in Paraguay.

Plant Dis 2021 Apr 27. Epub 2021 Apr 27.

Camara Paraguaya de Exportadores de Cereales y Oleaginosos (CAPECO), Asunción, Paraguay;

The genus contains several fungal species known to cause diseases on plants in the Poaceae family (Klaubauf et al. 2014; Wang et al. 2019). Read More

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Astigmatic dual-beam interferometric particle imaging for metal droplet 3D position and size measurement.

Opt Lett 2021 Apr;46(8):1942-1945

We propose astigmatic dual-beam interferometric particle imaging (ADIPI) to simultaneously measure the three-dimensional (3D) position and size of spherical metal droplets. A theoretical model reveals that the orientation and spacing of the ADIPI fringes generated from the two reflections propagating through an astigmatic imaging system relate to the depth position and size, respectively. Proof-of-concept experiments on micron-sized gallium droplets are performed, and the tilted fringes in elliptical patterns are observed in the ADIPI interferogram, confirming theoretical predictions. Read More

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Comparative ultrastructural-functional characterizations of the skin in three reptile species; Chalcides ocellatus, Uromastyx aegyptia aegyptia, and Psammophis schokari aegyptia (FORSKAL, 1775): Adaptive strategies to their habitat.

Microsc Res Tech 2021 Apr 14. Epub 2021 Apr 14.

Department of Zoology, Faculty of Science, Tanta University, Tanta, Egypt.

The current investigation was planned utilizing SEM, histological, and furthermore cytokeratin immunohistochemical to give a full depiction of skin of three reptiles species; Chalcides ocellatus (Scincidae), Uromastyx aegyptia aegyptia (Agamidae), and Psammophis schokari aegyptia (Colubridae) captured from Egypt with various ecological environment. Our SEM results showed different scales covered epidermis of three reptile's species with diverse surface microstructure. Overlapped rhomboid scales with numerous lenticular sense organs with numerous pores and oberhäutchen layer with microridges in C. Read More

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First Report of Wilt of European hornbeam (Carpinus betulus L.) Caused by in China.

Plant Dis 2021 Apr 9. Epub 2021 Apr 9.

Nanjing Forestry University, 74584, College of Forestry, No.159, Longpan Road, Xuanwu District, Nanjing, China, 210037.

European hornbeam (Carpinus betulus L.) has been used as an important ornamental species for urban landscaping since the Italian Renaissance (Rocchi et al. 2010). Read More

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Polarization-insensitive 3D conformal-skin metasurface cloak.

Light Sci Appl 2021 Apr 8;10(1):75. Epub 2021 Apr 8.

Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583, Singapore.

Electromagnetic metasurface cloaks provide an alternative paradigm toward rendering arbitrarily shaped scatterers invisible. Most transformation-optics (TO) cloaks intrinsically need wavelength-scale volume/thickness, such that the incoming waves could have enough long paths to interact with structured meta-atoms in the cloak region and consequently restore the wavefront. Other challenges of TO cloaks include the polarization-dependent operation to avoid singular parameters of composite cloaking materials and limitations of canonical geometries, e. Read More

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Implication of scanning electron microscopy in the seed morphology with special reference to three subfamilies of Fabaceae.

Microsc Res Tech 2021 Apr 8. Epub 2021 Apr 8.

Department of Plant Sciences, Quaid-i-Azam University, Islamabad, Pakistan.

The current research work was aimed to determine the morphological variation in the seeds of subfamilies Caesalpinioideae, Mimosoideae, and Papilionoideae using scanning electron microscope to investigate the different seed features including; Seed length, width, weight, hilum shape, position, fracture line pattern, pleurogram shape, texture crudeness, ornamentation wall, and surface ornamentation. A total of 12 species were collected. The study reveals that the seed types alters from psilate to rugose, pleurogram shape from lunar to U shape, hilum shape from elliptical to depressed, hilum position from terminal to subterminal, fracture line pattern from reticulate irregular ridges to psilate with regular ridges, texture crudeness from fine to coarse, surface ornamentation from reticulate to psilate, and ornamentation wall also varies from thin to thick. Read More

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Metasurface-Enhanced Antennas for Microwave Brain Imaging.

Diagnostics (Basel) 2021 Mar 3;11(3). Epub 2021 Mar 3.

Faculty of Natural and Mathematical Sciences, King's College London, Strand, London WC2R 2LS, UK.

Stroke is a very frequent disorder and one of the major leading causes of death and disability worldwide. Timely detection of stroke is essential in order to select and perform the correct treatment strategy. Thus, the use of an efficient imaging method for an early diagnosis of this syndrome could result in an increased survival's rate. Read More

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The influences of porus acusticus internus on ethnicity and importance in preoperative and intraoperative approaches.

Surg Radiol Anat 2021 Mar 30. Epub 2021 Mar 30.

Department of Anatomy, School of Medicine, Akdeniz University, Antalya, 07070, Turkey.

Purpose: The influences of porus acusticus internus (PAI) on ethnicity and differences between populations have not been investigated so far. Therefore, we performed this study to elucidate further the relationship between the different morphologies of PAI and ethnicity and to discuss their effects on surgery.

Methods: One hundred twenty dry adult human temporal bones (61 male, 59 female) were investigated in the study. Read More

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First Report of Alfalfa Root Rot Caused by Plectosphaerella cucumerina in Inner Mongolia Autonomous Region of China.

Plant Dis 2021 Mar 29. Epub 2021 Mar 29.

Tongliao, China;

Alfalfa (Medicago sativa L.) is an important forage crop with high nutrition for animal feed. In May 2016, a disease showing brown root rot was observed on alfalfa collected from several farms in Tongliao City (44°17' N; 121°29' E), Inner Mongolia Autonomous Region of China. Read More

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Identification and localization of Nup170 in the microsporidian Nosema bombycis.

Parasitol Res 2021 Jun 26;120(6):2125-2134. Epub 2021 Mar 26.

Jiangsu University of Science and Technology, Zhenjiang, 212018, Jiangsu Province, China.

As one of the core framework proteins of nuclear pore complex (NPC), nucleoporin Nupl70 acts as a structural adapter between the nucleolus and nuclear pore membrane and maintains the stability of NPC structure through interaction with other proteins. In this study, we identified a Nup170 protein in the microsporidian Nosema bombycis for the first time and named it as NbNup170. Secondary structure prediction showed that the NbNup170 contains α-helices and random coils. Read More

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Development of Dosimetric Verification System for Patient-Specific Quality Assurance of High-Dose-Rate Brachytherapy.

Front Oncol 2021 9;11:647222. Epub 2021 Mar 9.

Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, United States.

The aim of this study was to develop a dosimetric verification system (DVS) using a solid phantom for patient-specific quality assurance (QA) of high-dose-rate brachytherapy (HDR-BT). The proposed DVS consists of three parts: dose measurement, dose calculation, and analysis. All the dose measurements were performed using EBT3 film and a solid phantom. Read More

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Assessment of the left ventricular outflow tract during cardiac anaesthesia with biplane transoesophageal echocardiography: An observational study.

Eur J Anaesthesiol 2021 Mar 11. Epub 2021 Mar 11.

From the Department of Anaesthesia and Acute Pain Medicine, St. Vincent's Hospital Melbourne, Fitzroy, Victoria, Australia (BC, CB, RK).

Background: Assessment of left ventricular outflow tract (LVOT) area is a key component of quantification of aortic stenosis and stroke volume. Current international guidelines recommend measurement of the LVOT diameter with two-dimensional (2D) echocardiography and assume a circle. This may lead to erroneous measures of aortic valve area and adversely affect peri-operative decision making. Read More

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Immediate effects of myofascial release maneuver applied in different lower limb muscle chains on postural sway.

J Bodyw Mov Ther 2021 Jan 27;25:151-156. Epub 2020 Oct 27.

Postgraduate Program in Rehabilitation Sciences, Centro Universitário Augusto Motta/UNISUAM, Rio de Janeiro, RJ, Brazil; Department of Physiotherapy, Universidade Federal Do Rio de Janeiro/UFRJ, Rio de Janeiro, RJ, Brazil.

Background: There is little evidence about the myofascial release maneuver (MLM) targeting the fascial tissue and its effect on postural balance. This study investigated the immediate effects of the MLM in different lower limb muscle chains on the postural sway of healthy men.

Methods: Sixty-three healthy men (27. Read More

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January 2021

Maximal Fat Oxidation: Comparison between Treadmill, Elliptical and Rowing Exercises.

J Sports Sci Med 2021 03 1;20(1):170-178. Epub 2021 Mar 1.

Laboratory of Environmental Exercise Physiology, School of Kinesiology and Health Sciences, Laurentian University, Sudbury, Ontario, Canada.

Fat oxidation during exercise is associated with cardio-metabolic benefits, but the extent of which whole-body exercise modality elicits the greatest fat oxidation remains unclear. We investigated the effects of treadmill, elliptical and rowing exercise on fat oxidation in healthy individuals. Nine healthy males participated in three, peak oxygen consumption tests, on a treadmill, elliptical and rowing ergometer. Read More

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Using phase-corrected Bessel beams to cut glass substrates with a chamfered edge.

Appl Opt 2021 Jan;60(3):714-719

Ultrafast laser cutting of a glass substrate at an oblique angle is demonstrated using a phase-corrected Bessel beam. Simulations are used to predetermine the ideal phase of the incident Bessel beam such that an unaberrated Bessel beam is formed inside the tilted substrate. Additional corrections to the beam such as shortening, moving the intensity of the beam within the substrate, and the formation of an elliptical focal spot were necessary to ensure consistent chamfering of the substrate and are discussed herein. Read More

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January 2021

Planar metamaterial sensor with graphene elliptical rings in transmission mode.

Appl Opt 2021 Mar;60(8):2434-2440

A periodic planar metamaterial sensor in the terahertz band based on surface plasmon polariton resonances is proposed and studied. The unit cell includes four half-elliptical graphene rings located on a three-layer substrate including a layer, an air gap, and another layer. The embedded air gap between the two layers of improves the sensitivity of the sensor. Read More

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Finite element analysis on multi-toughening mechanism of microstructure of osteon.

J Mech Behav Biomed Mater 2021 05 26;117:104408. Epub 2021 Feb 26.

School of Aeronautics, Chongqing Jiaotong University, Chongqing, 400074, China.

The toughening mechanism of cortical bone is closely related to its hierarchical microstructure. Osteon is the most important microstructure of cortical bone. Therefore, it is very important to study the toughening mechanism of the microstructure of osteon. Read More

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First Report of the Rust Disease Caused by on New Host from Pakistan.

Plant Dis 2021 Mar 3. Epub 2021 Mar 3.

University of the Punjab, 66906, Botany, Lahore, Pakistan;

Sonchus arvensis (Asteraceae) is a traditional medicinal herb. The aerial parts are a rich source of vitamins, essential amino acids, and minerals, which may help in treatment of fever, inflammation, detoxication, and blood circulation (Li et al. 2018). Read More

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The role of trans-thoracic echocardiography in the assessment of aortic annular diameter.

Medicine (Baltimore) 2021 Mar;100(9):e24682

Faculty of Medicine, Al-Azhar University, Damietta.

Abstract: We aimed to compare two-dimension transthoracic echocardiogram (2D-TTE) and three-dimension transthoracic echocardiogram (3D-TTE) measurements of the aortic annular diameter using multi-detector CT (MDCT) as a gold standard.This prospective observational study included 50 consecutive patients who came to the cardiology department, Al-Azhar University Hospital, New Damietta, for MDCT coronary angiography. The study was carried out in the period from July 2016 until February 2017. Read More

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Stimulated Brillouin scattering in high-birefringence elliptical-core AsSe-PMMA microfibers.

Opt Lett 2021 Mar;46(5):945-948

In this Letter, we design and fabricate elliptical-core (ECORE) chalcogenide-polymethyl methacrylate (-PMMA) microfibers to explore the birefringence impact on stimulated Brillouin scattering. Numerical simulations based on the finite-element method and elastodynamic equation are utilized to calculate the phase and group birefringence and Brillouin gain spectra of the fundamental mode in three ECORE -PMMA microfibers at different core diameters. Experimentally measured and numerically calculated results show that as the core diameter of the minor axis of an ECORE microfiber with a ratio of 1. Read More

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