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Search for "nanostructure" in Full Text gives 347 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Nickel nanoparticle-decorated reduced graphene oxide/WO3 nanocomposite – a promising candidate for gas sensing

  • Ilka Simon,
  • Alexandr Savitsky,
  • Rolf Mülhaupt,
  • Vladimir Pankov and
  • Christoph Janiak

Beilstein J. Nanotechnol. 2021, 12, 343–353, doi:10.3762/bjnano.12.28

Graphical Abstract
  • recovery rate. Also, it should work at low cost and with low power consumption [3]. In comparison to conventional gas sensors, nanostructure-based gas sensors are more sensitive because of their increased detection area [4]. The most common mode used in gas sensing is the resistance mode, where the change
  • composite create a hierarchical nanostructure and facilitate the diffusion of NO2 molecules, increasing the contacts and enhancing the chemisorption of the gas. rGO has large specific area and more active sites. Gas sensors of n-type semiconductors based on oxides exhibit resistance changes induced by
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Published 15 Apr 2021

Exploring the fabrication and transfer mechanism of metallic nanostructures on carbon nanomembranes via focused electron beam induced processing

  • Christian Preischl,
  • Linh Hoang Le,
  • Elif Bilgilisoy,
  • Armin Gölzhäuser and
  • Hubertus Marbach

Beilstein J. Nanotechnol. 2021, 12, 319–329, doi:10.3762/bjnano.12.26

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  • hybrid structure can be lifted off from the substrate and transferred onto bulk substrates, such as SiO2, or onto TEM grids in order to obtain a free-standing CNM with a metallic nanostructure on top. It was shown that the membrane is mechanically stable enough during the whole process and that the
  • the SAM, etching solution, and metallic nanostructures needs to be considered. Especially regarding the large amount of possible precursors in FEBIP [4], for each type of metallic nanostructure a suitable transfer mechanism needs to be investigated and the interactions during the transfer process need
  • precursor dissociates locally on the activated sites. (e) Initial deposit that is formed by EBID respectively EBISA. (f) AG process that occurs on top of the initial deposit upon further precursor dosage. (g) Final well-defined nanostructure on top of a TPT on Ag(111)/mica sample. Results of FEBIP
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Published 07 Apr 2021

Paper-based triboelectric nanogenerators and their applications: a review

  • Jing Han,
  • Nuo Xu,
  • Yuchen Liang,
  • Mei Ding,
  • Junyi Zhai,
  • Qijun Sun and
  • Zhong Lin Wang

Beilstein J. Nanotechnol. 2021, 12, 151–171, doi:10.3762/bjnano.12.12

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  • introduce electronegative or electropositive functional groups) and micro-/nanostructure engineering (to introduce charge-trapping points to facilitate charge transfer) are effective ways to modulate the electronegativity. The surface modification of the friction materials is performed to implement chemical
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Published 01 Feb 2021

A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures

  • Sina Kaabipour and
  • Shohreh Hemmati

Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9

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  • reaction parameters, such as temperature, pH, precursor, and reagent concentration, on silver nanostructure size and morphology are discussed. Also, green synthesis techniques used for the synthesis of one-dimensional (1D) silver nanostructures have been reviewed, and the potential of alternative green
  • morphologies (especially 1D ones) and the possibility of altering current techniques towards more environmentally friendly, more energy-efficient, less hazardous, simpler, and cheaper procedures. Keywords: green nanotechnology; green reagents; green synthesis; one-dimensional silver nanostructure; silver
  • nanoparticles. The main purpose of such methodologies is to minimize environmental toxicity and health-related hazards [104][214][251][252][253]. In most green silver nanostructure synthesis processes, the reduction of Ag+ to Ag0 is performed either by biological species or by bio-based compounds derived from a
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Published 25 Jan 2021

Bio-imaging with the helium-ion microscope: A review

  • Matthias Schmidt,
  • James M. Byrne and
  • Ilari J. Maasilta

Beilstein J. Nanotechnol. 2021, 12, 1–23, doi:10.3762/bjnano.12.1

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  • nanopillar texture on the wing of a dragonfly Orthetrum villosovittatum was studied. In addition to imaging the wing alone, samples were prepared with E. coli bacteria on them, to study the bactericidal properties of the nanostructure. Along similar lines, the nanostructures on the wings of three different
  • rhizobacterial biofilm on the root under dryland and irrigation conditions was studied by fluorescent microscopy and SEM on a larger scale. HIM was used to visualise the nanostructure of the bacterial colonies; however, no micrographs with sub-20 nm resolution are shown. The second publication is an extended
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Published 04 Jan 2021

Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity

  • Bridget K. Mutuma,
  • Xiluva Mathebula,
  • Isaac Nongwe,
  • Bonakele P. Mtolo,
  • Boitumelo J. Matsoso,
  • Rudolph Erasmus,
  • Zikhona Tetana and
  • Neil J. Coville

Beilstein J. Nanotechnol. 2020, 11, 1834–1846, doi:10.3762/bjnano.11.165

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  • @NiPS/TiO2) core–shell nanostructures. The TEM results showed that the mSiO2@NiPS composite has a core–shell nanostructure with a unique flake-like shell morphology. XPS analysis revealed the successful formation of 1:1 nickel phyllosilicate on the SiO2 surface. The addition of TiO2 to the mSiO2@NiPS
  • the core–shell nanostructure and yielded superior photocatalytic properties. Keywords: bandgap energy; core–shell; dye degradation; nickel phyllosilicate; photocatalysts; Introduction Textile dyes and organic compounds are major water pollutants, which create an environmental hazard to aquatic
  • good support for the TiO2 nanoparticles. Further, a coating of TiO2 on the SiO2@NiPS surface greatly impacted the surface features and optoelectronic properties of the core–shell nanostructure and yielded superior photocatalytic properties. Results and Discussion Morphological features, textural, and
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Published 09 Dec 2020

Self-standing heterostructured NiCx-NiFe-NC/biochar as a highly efficient cathode for lithium–oxygen batteries

  • Shengyu Jing,
  • Xu Gong,
  • Shan Ji,
  • Linhui Jia,
  • Bruno G. Pollet,
  • Sheng Yan and
  • Huagen Liang

Beilstein J. Nanotechnol. 2020, 11, 1809–1821, doi:10.3762/bjnano.11.163

Graphical Abstract
  • [26]. For instance, molybdenum/tungsten carbide with a well-defined nanostructure was synthesized via a hydrothermal method, and the obtained metal carbide catalyst yielded a high capacity in lithium–oxygen batteries [15]. Also, titanium carbide was synthesized by Bruce et al. as cathode material for
  • porous cubic nanostructure exhibiting excellent catalytic properties [36][37]. Biomass materials can be used to prepare N-doped carbons since their proteins contain nitrogen atoms. This method is an economically viable way to produce N-doped carbons at a large scale [38][39]. Our group has synthesized a
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Published 02 Dec 2020

Molecular dynamics modeling of the influence forming process parameters on the structure and morphology of a superconducting spin valve

  • Alexander Vakhrushev,
  • Aleksey Fedotov,
  • Vladimir Boian,
  • Roman Morari and
  • Anatolie Sidorenko

Beilstein J. Nanotechnol. 2020, 11, 1776–1788, doi:10.3762/bjnano.11.160

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  • atomic structures depending on the main parameters of the deposition process. Keywords: hybrid nanostructure; mathematical modeling; modified embedded-atom method; molecular dynamics; spintronics; spin valve; vacuum deposition; Introduction Multilayer superconductor/ferromagnetic (S/F) hybrid
  • nondissipative elements of spintronics, it is possible to create new superconducting nanoelectronics devices that consume minimum energy and have a high operation speed [8][9][10][11][12][13]. One type of magnetic nanostructure with wide potential use is the spin valve [14][15], consisting of several magnetic
  • significantly reduce the number of technological steps and adjustments required to obtain the desired multilayer nanostructure. It should be noted that mathematical modeling is widely used in the design and analysis of various nanosystems properties [24][25]; however, in relation to the considered class of
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Published 24 Nov 2020

Selective detection of complex gas mixtures using point contacts: concept, method and tools

  • Alexander P. Pospelov,
  • Victor I. Belan,
  • Dmytro O. Harbuz,
  • Volodymyr L. Vakula,
  • Lyudmila V. Kamarchuk,
  • Yuliya V. Volkova and
  • Gennadii V. Kamarchuk

Beilstein J. Nanotechnol. 2020, 11, 1631–1643, doi:10.3762/bjnano.11.146

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  • special technique during the synthesis of this nanostructure. The production of the energy source and the matrix as a whole is based on electrochemical processes described previously [34][37][38]. The applied technology guaranteed high reliability and longevity to the sensor elements. Point-contact sensor
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Published 28 Oct 2020

High-responsivity hybrid α-Ag2S/Si photodetector prepared by pulsed laser ablation in liquid

  • Raid A. Ismail,
  • Hanan A. Rawdhan and
  • Duha S. Ahmed

Beilstein J. Nanotechnol. 2020, 11, 1596–1607, doi:10.3762/bjnano.11.142

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  • . Two peaks appeared at 2842 and 2942 cm−1 in the FTIR spectrum of Ag2S prepared with CTAB. These peaks were attributed to the methylene (–CH2) extension vibration, indicating the adsorption of CTAB on the nanostructure surface. The broad IR peak at 3400 cm−1 is indexed to the presence of adsorbed water
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Published 21 Oct 2020

Fabrication of nano/microstructures for SERS substrates using an electrochemical method

  • Jingran Zhang,
  • Tianqi Jia,
  • Xiaoping Li,
  • Junjie Yang,
  • Zhengkai Li,
  • Guangfeng Shi,
  • Xinming Zhang and
  • Zuobin Wang

Beilstein J. Nanotechnol. 2020, 11, 1568–1576, doi:10.3762/bjnano.11.139

Graphical Abstract
  • ] fabricated micro/nanostructures on the surface of Au-coated single crystal silicon. By changing the etching time and current, micro/nanostructures with different size scales and geometric shapes (such as hexagons and pentagons) were obtained. Compared with other geometries, the hexagonal micro/nanostructure
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Published 16 Oct 2020

Optically and electrically driven nanoantennas

  • Monika Fleischer,
  • Dai Zhang and
  • Alfred J. Meixner

Beilstein J. Nanotechnol. 2020, 11, 1542–1545, doi:10.3762/bjnano.11.136

Graphical Abstract
  • . However, owing to the polarization and far-field interference, a silencing of the SHG is observed for decreasing gap sizes [53]. This effect is further studied in [54] using the surface integral equation method. On the other hand, the generation of higher harmonics by a dielectric nanostructure can be
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Published 07 Oct 2020

Wafer-level integration of self-aligned high aspect ratio silicon 3D structures using the MACE method with Au, Pd, Pt, Cu, and Ir

  • Mathias Franz,
  • Romy Junghans,
  • Paul Schmitt,
  • Adriana Szeghalmi and
  • Stefan E. Schulz

Beilstein J. Nanotechnol. 2020, 11, 1439–1449, doi:10.3762/bjnano.11.128

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  • MEMS process flow. This means that the etched silicon structures have to be fabricated within a pre-defined area of the die with common semiconductor fabrication processes. These nanostructure templates are the basis for a further processing towards integrated functional systems. Results and Discussion
  • The fabrication of the wafer-level integrated nanostructure templates is divided into two main parts, i.e., the formation of the noble metal nanoparticles, and the subsequent silicon wet etching process. The subsidiary process steps are standard semiconductor processes and therefore not analysed and
  • main etching mechanism remains the same. However, these structures stick together at the topmost point. The nanostructure bundles form during the drying process. This occurs when the capillary forces during drying are high enough to cluster neighbouring single Si wires, and the adhesion force of the
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Published 23 Sep 2020

Analysis of catalyst surface wetting: the early stage of epitaxial germanium nanowire growth

  • Owen C. Ernst,
  • Felix Lange,
  • David Uebel,
  • Thomas Teubner and
  • Torsten Boeck

Beilstein J. Nanotechnol. 2020, 11, 1371–1380, doi:10.3762/bjnano.11.121

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  • grow germanium nanowires on different substrates is described. Keywords: dewetting; germanium; interfacial energy; Laplace pressure; nanostructure; nanowire; Ostwald ripening; wetting layer; Introduction Wetting phenomena as well as the formation and movement of droplets are essential for numerous
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Published 09 Sep 2020

Photothermally active nanoparticles as a promising tool for eliminating bacteria and biofilms

  • Mykola Borzenkov,
  • Piersandro Pallavicini,
  • Angelo Taglietti,
  • Laura D’Alfonso,
  • Maddalena Collini and
  • Giuseppe Chirico

Beilstein J. Nanotechnol. 2020, 11, 1134–1146, doi:10.3762/bjnano.11.98

Graphical Abstract
  • terms of their photothermally induced antibacterial activity [80][81]. Currently, there are still a few studies relating the application of the photothermal effect on CuS to eradicate bacteria. A multifunctional core/satellite nanostructure was engineered by decorating CuS nanoparticles onto the surface
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Published 31 Jul 2020

Thermophoretic tweezers for single nanoparticle manipulation

  • Jošt Stergar and
  • Natan Osterman

Beilstein J. Nanotechnol. 2020, 11, 1126–1133, doi:10.3762/bjnano.11.97

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  • tweezers is that the former uses a plasmonic nanostructure to create large local temperature gradients of the order of 100 K/μm, while the temperature gradients in our experiments, using a uniform substrate, are approximately ten times lower. To understand the effect of the gradient ∇T, one can define the
  • molecules in the “reactor” area is needed. A combination of a uniform absorbing substrate for large-scale manipulation and a central, smaller plasmonic nanostructure with a large thermal gradient, therefore, seems ideal. One might argue about another limitation of the setup for single-molecule chemistry
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Published 30 Jul 2020

Excitonic and electronic transitions in Me–Sb2Se3 structures

  • Nicolae N. Syrbu,
  • Victor V. Zalamai,
  • Ivan G. Stamov and
  • Stepan I. Beril

Beilstein J. Nanotechnol. 2020, 11, 1045–1053, doi:10.3762/bjnano.11.89

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  • ][15]. In order to use Sb2Se3 to build high-performance devices it is necessary to study its crystalline nanostructure in terms of band structure and optical and optoelectronic properties, especially in the bandgap region in which ambiguous and contradictory results have been obtained. For example, the
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Published 16 Jul 2020

A new photodetector structure based on graphene nanomeshes: an ab initio study

  • Babak Sakkaki,
  • Hassan Rasooli Saghai,
  • Ghafar Darvish and
  • Mehdi Khatir

Beilstein J. Nanotechnol. 2020, 11, 1036–1044, doi:10.3762/bjnano.11.88

Graphical Abstract
  • atomic orbitals (LCAO) basis set. Generalized gradient approximation (GGA) is used for the exchange–correlation functional. A 9 × 9 k-point grid and a cutoff energy of 160 Ry are used to perform these calculations. All nanostructure geometries are relaxed. To evaluate optical absorption, the
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Published 15 Jul 2020

Gas-sensing features of nanostructured tellurium thin films

  • Dumitru Tsiulyanu

Beilstein J. Nanotechnol. 2020, 11, 1010–1018, doi:10.3762/bjnano.11.85

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  • nanostructured Te films were studied with a special focus on the gas-response kinetics. Results and Discussion Sample preparation, morphology and structure Two methods were used to nanostructure Te-based films: growth of Te nanocrystals on Pyrex glass substrates or deposition of amorphous Te films onto
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Published 10 Jul 2020

A set of empirical equations describing the observed colours of metal–anodic aluminium oxide–Al nanostructures

  • Cristina V. Manzano,
  • Jakob J. Schwiedrzik,
  • Gerhard Bürki,
  • Laszlo Pethö,
  • Johann Michler and
  • Laetitia Philippe

Beilstein J. Nanotechnol. 2020, 11, 798–806, doi:10.3762/bjnano.11.64

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  • . In a previous study by our group, the effects of morphological parameters (pore diameters, interpore distance, porosity, and nanostructure order) on the colours and the effective refractive index of AAO films were studied on metal–AAO–Al nanostructures [4]. Thickness and porosity are the two main
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Published 13 May 2020

Light–matter interactions in two-dimensional layered WSe2 for gauging evolution of phonon dynamics

  • Avra S. Bandyopadhyay,
  • Chandan Biswas and
  • Anupama B. Kaul

Beilstein J. Nanotechnol. 2020, 11, 782–797, doi:10.3762/bjnano.11.63

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  • consequently (Figure 4e) vary widely in 1L, ML, and bulk WSe2, as nanostructure differences become the more dominant scattering source at low T. These dissimilarities in the decay in 1L, ML and bulk WSe2 at low T are characterized by fitting the results of Figure 4a, i.e., τ(T) for the mode, to the
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Published 12 May 2020

Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions

  • Robert Kozioł,
  • Marcin Łapiński,
  • Paweł Syty,
  • Damian Koszelow,
  • Wojciech Sadowski,
  • Józef E. Sienkiewicz and
  • Barbara Kościelska

Beilstein J. Nanotechnol. 2020, 11, 494–507, doi:10.3762/bjnano.11.40

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  • responsible for dewetting. Especially because defects are always present in the interface between the substrate and the film. In the design of metallic nanostructure systems for plasmonic applications, the homogeneous distribution of nanostructures is very important, both in size and location on the surface
  • different periods of time: (a) 1 min, (b) 5 min, (c) 10 min and (d) 15 min; (e) average nanostructure diameter as a function of the annealing time. SEM images of a 2.8 nm thick film, annealed for a constant time 15 min at different temperatures: (a) 100 °C, (b) 200 °C, (c) 300 °C, (d) 400 °C, (e) 500 °C and
  • (f) 600 °C; (g) average nanostructure diameter as a function of the annealing temperature. (a) HRTEM image of a cross section of a nanoisland formed from a 3 nm thick film, annealed at 550 °C for 15 min; (b) EDS analysis and (c) detailed EDS analysis of the cross section of the nanoisland. Absorbance
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Published 25 Mar 2020

An advanced structural characterization of templated meso-macroporous carbon monoliths by small- and wide-angle scattering techniques

  • Felix M. Badaczewski,
  • Marc O. Loeh,
  • Torben Pfaff,
  • Dirk Wallacher,
  • Daniel Clemens and
  • Bernd M. Smarsly

Beilstein J. Nanotechnol. 2020, 11, 310–322, doi:10.3762/bjnano.11.23

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  • resin- and pitch-based samples treated at 3000 °C show no general (hkl) reflections as expected for graphite, while the non-templated precursors are converted to graphite at this temperature. This absence of 3D order can be attributed to the confinement and the nanostructure, which hinder the
  • counterintuitive as pitches belong to the carbon materials that usually transform readily into graphite. This inhibition of graphite formation is probably due to the confinement effect of the nanostructure imposed by the nanoscale porosity. The structural alterations on the nanometer scale are depicted in Figure 8
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Published 10 Feb 2020

Rational design of block copolymer self-assemblies in photodynamic therapy

  • Maxime Demazeau,
  • Laure Gibot,
  • Anne-Françoise Mingotaud,
  • Patricia Vicendo,
  • Clément Roux and
  • Barbara Lonetti

Beilstein J. Nanotechnol. 2020, 11, 180–212, doi:10.3762/bjnano.11.15

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  • in order to induce a change in the nanostructure as a consequence of a change of pH value. Piperidine groups for example possess a pKa value close to the acidity of tumor tissues and exhibit a transition from hydrophobic at pH 7.4 to hydrophilic at pH 6.8. As a consequence, micelles increase their
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Published 15 Jan 2020

Fabrication of Ag-modified hollow titania spheres via controlled silver diffusion in Ag–TiO2 core–shell nanostructures

  • Bartosz Bartosewicz,
  • Malwina Liszewska,
  • Bogusław Budner,
  • Marta Michalska-Domańska,
  • Krzysztof Kopczyński and
  • Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2020, 11, 141–146, doi:10.3762/bjnano.11.12

Graphical Abstract
  • dedicated to fabrication and application of plasmonic NP-modified TiO2 HSs have been published, including those mentioned above. In most cases the methodologies used are either complex or allow only for a limited control of the nanostructure morphologies and the resulting properties. In addition, we are not
  • to several changes occurring in the nanostructure morphology. Any interactions affecting the optical properties of these CSNs occurred only between a single silver core and the titania shell. Based on the proposed mechanism, the annealing gradually led to a transformation of the single and relatively
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Published 10 Jan 2020
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