bluuebunny/crossref_metadata_2025 huggingface dataset:
MXene saturable absorber enabled hybrid mode-locking technology: a new routine of advancing femtosecond fiber lasers performance
Authors: Ma Chunyang , Huang Weichun , Wang Yunzheng , Adams Jordan , Wang Zhenhong , Liu Jun , Song Yufeng , Ge Yanqi , Guo Zhongyi , Hu Lanping , Zhang Han
Published: June 2020

MXene is a promising two-dimensional (2D) material that is widely used in electro-photonic devices due to its unique properties. In this contribution, V2CT
x
, a novel MXene, was employed as a saturable absorber (SA) for hybrid passively mode-locked fiber lasers. An ultra-stable and self-starting mode-locked laser system with low threshold can be achieved using V2CT
x
nanosheets and nonlinear polarization evolution (NPE). Signal to noise ratio increased 13 dB compared with using only NPE SA. A 72 fs pulse duration is easily achieved from this hybrid mode-locked fiber laser system. To the best of our knowledge, this is the shortest pulse duration generated from the Yb-doped mode-locked fiber lasers using a hybrid or 2D SAs. This study proves that MXene V2CT
x
nanosheets can be developed as suitable SAs and served as potential advanced ultrafast photonic devices in the future.
Stacking angle dependent multiple excitonic resonances in bilayer tungsten diselenide
Authors: Arora Ankit , Nayak Pramoda K. , Dixit Tejendra , Ganapathi Kolla Lakshmi , Krishnan Ananth , Rao Mamidanna Sri Ramachandra
Published: June 2020

We report on multiple excitonic resonances in bilayer tungsten diselenide (BL-WSe2) stacked at different angles and demonstrate the use of the stacking angle to control the occurrence of these excitations. BL-WSe2 with different stacking angles were fabricated by stacking chemical vapour deposited monolayers and analysed using photoluminescence measurements in the temperature range 300–100 K. At reduced temperatures, several excitonic features were observed and the occurrences of these exitonic resonances were found to be stacking angle dependent. Our results indicate that by controlling the stacking angle, it is possible to excite or quench higher order excitations to tune the excitonic flux in optoelectronic devices. We attribute the presence/absence of multiple higher order excitons to the strength of interlayer coupling and doping effect from SiO2/Si substrate. Understanding interlayer excitations will help in engineering excitonic devices and give an insight into the physics of many-body dynamics.
Broadband and high-efficiency accelerating beam generation by dielectric catenary metasurfaces
Authors: Zhang Fei , Zeng Qingyu , Pu Mingbo , Wang Yanqin , Guo Yinghui , Li Xiong , Ma Xiaoliang , Luo Xiangang
Published: June 2020

Self-accelerating beams show considerable captivating phenomena and applications owing to their transverse acceleration, diffraction-free and self-healing properties in free space. Metasurfaces consisting of dielectric or metallic subwavelength structures attract enormous attention to acquire self-accelerating beams, owing to their extraordinary capabilities in the arbitrary control of electromagnetic waves. However, because the self-accelerating beam generator possesses a large phase gradient, traditional discrete metasurfaces suffer from insufficient phase sampling, leading to a low efficiency and narrow spectral band. To overcome this limitation, a versatile platform of catenary-inspired dielectric metasurfaces is proposed to endow arbitrary continuous wavefronts. A high diffraction efficiency approaching 100% is obtained in a wide spectral range from 9 to 13 μm. As a proof-of-concept demonstration, the broadband, high-efficiency and high-quality self-accelerating beam generation is experimentally verified in the infrared band. Furthermore, the chiral response of the proposed metasurfaces enables the spin-controlled beam acceleration. Considering these superior performances, this design methodology may find wide applications in particle manipulation, high-resolution imaging, optical vortex generation, and so forth.
Particle simulation of plasmons
Authors: Ding Wen Jun , Lim Jeremy Zhen Jie , Do Hue Thi Bich , Xiong Xiao , Mahfoud Zackaria , Png Ching Eng , Bosman Michel , Ang Lay Kee , Wu Lin
Published: June 2020

Particle simulation has been widely used in studying plasmas. The technique follows the motion of a large assembly of charged particles in their self-consistent electric and magnetic fields. Plasmons, collective oscillations of the free electrons in conducting media such as metals, are connected to plasmas by very similar physics, in particular, the notion of collective charge oscillations. In many cases of interest, plasmons are theoretically characterized by solving the classical Maxwell’s equations, where the electromagnetic responses can be described by bulk permittivity. That approach pays more attention to fields rather than motion of electrons. In this work, however, we apply the particle simulation method to model the kinetics of plasmons, by updating both particle position and momentum (Newton–Lorentz equation) and electromagnetic fields (Ampere and Faraday laws) that are connected by current. Particle simulation of plasmons can offer insights and information that supplement those gained by traditional experimental and theoretical approaches. Specifically, we present two case studies to show its capabilities of modeling single-electron excitation of plasmons, tracing instantaneous movements of electrons to elucidate the physical dynamics of plasmons, and revealing electron spill-out effects of ultrasmall nanoparticles approaching the quantum limit. These preliminary demonstrations open the door to realistic particle simulations of plasmons.
Generation of terahertz vector beams using dielectric metasurfaces via spin-decoupled phase control
Authors: Xu Yuehong , Zhang Huifang , Li Quan , Zhang Xueqian , Xu Quan , Zhang Wentao , Hu Cong , Zhang Xixiang , Han Jiaguang , Zhang Weili
Published: June 2020

Cylindrical vector beams (CVBs), being a special kind of beams with spatially variant states of polarizations, are promising in photonics applications, including high-resolution imaging, plasmon excitation, optical trapping, and laser machining. Recently, generating CVBs using metasurfaces has drawn enormous interest owing to their highly designable, multifunctional, and integratable features. However, related studies remain unexplored in the terahertz regime. Here, a generic method for efficiently generating terahertz CVBs carrying orbital angular momentums (OAMs) is proposed and experimentally demonstrated using transmission-type spatial-variant dielectric metasurfaces, which is realized by designing the interference between the two circularly polarized transmission components. This method is based on spin-decoupled phase control allowed by simultaneously manipulating the dynamic phase and geometric phase of each structure, endowing more degree of freedom in designing the vector beams. Two types of metasurfaces which respectively generate polarization-dependent terahertz vector vortex beams (VVBs) and vector Bessel beams (VBBs) are experimentally characterized. The proposed method opens a new window to generate versatile vector beams, providing new capabilities in developing novel, compact, and high-performance devices applicable to broad electromagnetic spectral regimes.
Highly stable MXene (V2CTx)-based harmonic pulse generation
Authors: Huang Weichun , Ma Chunyang , Li Chao , Zhang Ye , Hu Lanping , Chen Tingting , Tang Yanfeng , Ju Jianfeng , Zhang Han
Published: June 2020

MXene as a novel two-dimensional (2D) material exhibits a lot of advantages in nonlinear optics. However, the common MXene, Ti3C2Tx and Ti2CTx nanosheets, easily suffer from degradation under ambient conditions, greatly limiting their practical applications. Here, we demonstrated one of MXene compounds, V2CTx, which has a strong modulation depth (nearly 50%), can serve as an excellent saturable absorber (SA) in passively mode-locked (PML) fiber lasers. More importantly, 206th harmonic order has been successfully generated in Er-doped mode-locked fiber laser, exhibiting maximum repetition rate of 1.01 GHz and pulse duration of 940 fs, which to the best of our knowledge, is the highest harmonic mode-locked fiber laser from the MXene SA so far. In addition, the high harmonic order mode-locked operation can maintain at least 24 h without any noticeable change, suggesting MXene V2CTx nanosheets have excellent stability in this mode-locked fiber laser. It is anticipated that the present work can pave the way to new design for MXene-based heterostructures for high-performance harmonic mode-locked lasers.
Thermal-responsive multicolor emission of single NaGdF4:Yb/Ce/Ho upconversion nanocrystals for anticounterfeiting application
Authors: Hu Yanqing , Shao Qiyue , Deng Xinyi , Jiang Jianqing
Published: June 2020

This study presents a novel and high-level anticounterfeiting strategy based on Ce/Yb/Ho triply-doped NaGdF4 nanocrystals with temperature-responsive multicolor emission. A critical factor leading to the multicolor emission is confirmed by comparing the luminescence thermal behaviors of nanocrystals in various atmospheres. Through analyzing the temperature-dependent lifetimes of Yb3+ ions in air, we demonstrate that thermally-induced multicolor emission mainly originates from the gradually-attenuated H2O quenching effect. Because the cross-relaxations between Ce3+ and Ho3+ ions and the nonradiative transitions of Yb3+ ions create plenty of phonon heat, the multicolor emission of nanocrystals can be achieved under 975 nm excitation at a relatively low power density. This recognition method is efficient and convenient for security authentication. The as-synthesized core nanocrystals can be directly used to fabricate anticounterfeiting ink without further processing (e.g. core/shell or hybrid). Therefore, the small-sized β-NaGdF4:Yb/Ce/Ho nanocrystals are promising candidate for security application.
Exact mapping between a laser network loss rate and the classical XY Hamiltonian by laser loss control
Authors: Gershenzon Igor , Arwas Geva , Gadasi Sagie , Tradonsky Chene , Friesem Asher , Raz Oren , Davidson Nir
Published: June 2020

Recently, there has been growing interest in the utilization of physical systems as heuristic optimizers for classical spin Hamiltonians. A prominent approach employs gain-dissipative optical oscillator networks for this purpose. Unfortunately, these systems inherently suffer from an inexact mapping between the oscillator network loss rate and the spin Hamiltonian due to additional degrees of freedom present in the system such as oscillation amplitude. In this work, we theoretically analyze and experimentally demonstrate a scheme for the alleviation of this difficulty. The scheme involves control over the laser oscillator amplitude through modification of individual laser oscillator loss. We demonstrate this approach in a laser network classical XY model simulator based on a digital degenerate cavity laser. We prove that for each XY model energy minimum there corresponds a unique set of laser loss values that leads to a network state with identical oscillation amplitudes and to phase values that coincide with the XY model minimum. We experimentally demonstrate an eight fold improvement in the deviation from the minimal XY energy by employing our proposed solution scheme.
High-quality micropattern printing by interlacing-pattern holographic femtosecond pulses
Authors: Wang Zhipeng , Li Xiaowei , Jiang Lan , Li Bohong , Wei Qunshuo , Huang Lingling , Wang Zhi , Yin Jiangang , Lu Jiangang
Published: June 2020

To improve the efficiency of femtosecond laser direct writing, holographic femtosecond laser patterning using spatial light modulators has been widely used for the processing of micro/nanopatterns. However, the speckle noise of modulated optical fields severely limits the quality of fabricated patterns. We present a simple and effective method which involves interlacing a target pattern into a series of target subpatterns that consist of spaced spots to solve this problem. The separation of spots weakens the random interference between adjacent spots of optical fields, so the speckle noise reduces effectively, which improves the uniformity of the modulated optical fields and makes the fabricated patterns with high quality. With optimal interlacing numbers, complex micropattern arrays containing curved edges and sophisticated structures can be fabricated with superior quality and high efficiency. Binary holograms with improved optical characterization are realized by using the interlacing-pattern method, revealing the extensive potential of this method in micropattern processing and functional device fabrication with high quality and efficiency.
Recent advances in mode-locked fiber lasers based on two-dimensional materials
Authors: Wang Junli , Wang Xiaoli , Lei Jingjing , Ma Mengyuan , Wang Cong , Ge Yanqi , Wei Zhiyi
Published: June 2020

Due to the unique properties of two-dimensional (2D) materials, much attention has been paid to the exploration and application of 2D materials. In this review, we focus on the application of 2D materials in mode-locked fiber lasers. We summarize the synthesis methods for 2D materials, fiber integration with 2D materials and 2D materials based saturable absorbers. We discuss the performance of the diverse mode-locked fiber lasers in the typical operating wavelength such as 1, 1.5, 2 and 3 μm. Finally, a summary and outlook of the further applications of the new materials in mode-locked fiber lasers are presented.
Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
Authors: Apostolakis Apostolos , Pereira Mauro F.
Published: June 2020

Semiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertzs. However, charge accumulation, traps and interface defects lead to pronounced asymmetries in the nonlinear current flow, from which high harmonic generation stems. This problem requires a full non-perturbative solution of asymmetric current flow under irradiation, which we deliver in this paper within the Boltzmann-Bloch approach. We investigate the nonlinear output on both frequency and time domains and demonstrate a significant enhancement of even harmonics by tuning the interface quality. Moreover, we find that increasing arbitrarily the input power is not a solution for high nonlinear output, in contrast with materials described by conventional susceptibilities. There is a complex combination of asymmetry and power values leading to maximum high harmonic generation.
Polaritonic XY-Ising machine
Authors: Kalinin Kirill P. , Amo Alberto , Bloch Jacqueline , Berloff Natalia G.
Published: June 2020

Gain-dissipative systems of various physical origin have recently shown the ability to act as analogue minimisers of hard combinatorial optimisation problems. Whether or not these proposals will lead to any advantage in performance over the classical computations depends on the ability to establish controllable couplings for sufficiently dense short- and long-range interactions between the spins. Here, we propose a polaritonic XY-Ising machine based on a network of geometrically isolated polariton condensates capable of minimising discrete and continuous spin Hamiltonians. We elucidate the performance of the proposed computing platform for two types of couplings: relative and absolute. The interactions between the network nodes might be controlled by redirecting the emission between the condensates or by sending the phase information between nodes using resonant excitation. We discuss the conditions under which the proposed machine leads to a pure polariton simulator with pre-programmed couplings or results in a hybrid classical polariton simulator. We argue that the proposed architecture for the remote coupling control offers an improvement over geometrically coupled condensates in both accuracy and stability as well as increases versatility, range, and connectivity of spin Hamiltonians that can be simulated with polariton networks.
Multiphysical sensing of light, sound and microwave in a microcavity Brillouin laser
Authors: Yang Jianfan , Qin Tian , Zhang Fangxing , Chen Xianfeng , Jiang Xiaoshun , Wan Wenjie
Published: June 2020

Light, sound, and microwave are important tools for many interdisciplinary applications in a multi-physical environment, and they usually are inefficient to be detected simultaneously in the same physical platform. However, at the microscopic scale, these waves can unexpectedly interact with the same microstructure through resonant enhancement, making it a unique hybrid micro-system for new applications across multiple physical channels. Here we experimentally demonstrate an optomechanical microdevice based on Brillouin lasing operation in an optical microcavity as a sensitive unit to sense external light, sound, and microwave signals in the same platform. These waves can induce modulations to the microcavity Brillouin laser (MBL) in a resonance-enhanced manner through either the pressure forces including radiation pressure force or thermal absorption, allowing several novel applications such as broadband non-photovoltaic detection of light, sound-light wave mixing, and deep-subwavelength microwave imaging. These results pave the way towards on-chip integrable optomechanical solutions for sensing, free-space secure communication, and microwave imaging.
Ultra-wideband enhancement on mid-infrared fingerprint sensing for 2D materials and analytes of monolayers by a metagrating
Authors: Xie Yinong , Liu Xueying , Li Fajun , Zhu Jinfeng , Feng Naixing
Published: June 2020

Mid-infrared absorption spectroscopy is a powerful tool to identify analytes by detecting their material fingerprint in a label-free way, but it faces barriers on trace-amount analysis due to the difficulties in enhancing the broadband spectral signals. Here, we propose a sensing scheme based on the angular scanning of polarized light on a dielectric metagrating, and demonstrate it by numerical simulation. This approach not only indicates a series of significant signal enhancement factors over 30 times in an ultra-wide mid-infrared band, but also enables the explicit identification for various analytes, including 2D materials and trace-amount thin film samples. Our method would facilitate mid-infrared sensing for 2D materials and trace-amount analysis, and enable many new applications on non-destructive molecular identification.
Exploiting deep learning network in optical chirality tuning and manipulation of diffractive chiral metamaterials
Authors: Tao Zilong , Zhang Jun , You Jie , Hao Hao , Ouyang Hao , Yan Qiuquan , Du Shiyin , Zhao Zeyu , Yang Qirui , Zheng Xin , Jiang Tian
Published: June 2020

Deep-learning (DL) network has emerged as an important prototyping technology for the advancements of big data analytics, intelligent systems, biochemistry, physics, and nanoscience. Here, we used a DL model whose key algorithm relies on deep neural network to efficiently predict circular dichroism (CD) response in higher-order diffracted beams of two-dimensional chiral metamaterials with different parameters. To facilitate the training process of DL network in predicting chiroptical response, the traditional rigorous coupled wave analysis (RCWA) method is utilized. Notably, these T-like shaped chiral metamaterials all exhibit the strongest CD response in the third-order diffracted beams whose intensities are the smallest, when comparing up to four diffraction orders. Our comprehensive results reveal that by means of DL network, the complex and nonintuitive relations between T-like metamaterials with different chiral parameters (i. e., unit period, width, bridge length, and separation length) and their CD performances are acquired, which owns an ultrafast computational speed that is four orders of magnitude faster than RCWA and a high accuracy. The insights gained from this study may be of assistance to the applications of DL network in investigating different optical chirality in low-dimensional metamaterials and expediting the design and optimization processes for hyper-sensitive ultrathin devices and systems.
Computer generated optical volume elements by additive manufacturing
Authors: Dinc Niyazi Ulas , Lim Joowon , Kakkava Eirini , Moser Christophe , Psaltis Demetri
Published: June 2020

Computer generated optical volume elements have been investigated for information storage, spectral filtering, and imaging applications. Advancements in additive manufacturing (3D printing) allow the fabrication of multilayered diffractive volume elements in the micro-scale. For a micro-scale multilayer design, an optimization scheme is needed to calculate the layers. The conventional way is to optimize a stack of 2D phase distributions and implement them by translating the phase into thickness variation. Optimizing directly in 3D can improve field reconstruction accuracy. Here we propose an optimization method by inverting the intended use of Learning Tomography, which is a method to reconstruct 3D phase objects from experimental recordings of 2D projections of the 3D object. The forward model in the optimization is the beam propagation method (BPM). The iterative error reduction scheme and the multilayer structure of the BPM are similar to neural networks. Therefore, this method is referred to as Learning Tomography. Here, instead of imaging an object, we reconstruct the 3D structure that performs the desired task as defined by its input-output functionality. We present the optimization methodology, the comparison by simulation work and the experimental verification of the approach. We demonstrate an optical volume element that performs angular multiplexing of two plane waves to yield two linearly polarized fiber modes in a total volume of 128 μm by 128 μm by 170 μm.
Direct routing of intensity-editable multi-beams by dual geometric phase interference in metasurface
Authors: Ding Guowen , Chen Ke , Luo Xinyao , Qian Guangxu , Zhao Junming , Jiang Tian , Feng Yijun
Published: June 2020

Controlling spin electromagnetic waves by ultra-thin Pancharatnam-Berry (PB) metasurfaces show promising prospects in the optical and wireless communications. One of the major challenge is to precisely control over the complex wavefronts and spatial power intensity characteristics without relying on massive algorithm optimizations, which requires independent amplitude and phase tuning. However, traditional PB phase can only provide phase control. Here, by introducing the interference of dual geometric phases, we propose a metasurface that can provide arbitrary amplitude and phase manipulations on meta-atom level for spin waves, achieving direct routing of multi-beams with desired intensity distribution. As the experimental demonstration, we design two microwave metasurfaces for respectively controlling the far-field and near-field multi-beam generations with desired spatial scatterings and power allocations, achieving full control of both sophisticated wavefronts and their energy distribution. This approach to directly generate editable spatial beam intensity with tailored wavefront may pave a way to design advanced meta-devices that can be potentially used in many real-world applications, such as multifunctional, multiple-input multiple-output and high-quality imaging devices.
Optical anapole mode in nanostructured lithium niobate for enhancing second harmonic generation
Authors: Li Yang , Huang Zhijin , Sui Zhan , Chen Huajiang , Zhang Xinyue , Huang Weian , Guan Heyuan , Qiu Wentao , Dong Jiangli , Zhu Wenguo , Yu Jianhui , Lu Huihui , Chen Zhe
Published: June 2020

Second harmonic generation (SHG) with a material of large transparency is an attractive way of generating coherent light sources at exotic wavelength range such as VUV, UV and visible light. It is of critical importance to improve nonlinear conversion efficiency in order to find practical applications in quantum light source and high resolution nonlinear microscopy, etc. Here an enhanced SHG with conversion efficiency up to 10−2% at SH wavelength of 282.7 nm under 11 GW/cm2 pump intensity via the excitation of anapole in lithium niobite (LiNbO3, or LN) nanodisk through the dominating d
33 nonlinear coefficient is investigated. The anapole has advantages of strongly suppressing far-field scattering and well-confined internal field which helps to boost the nonlinear conversion. Anapoles in LN nanodisk is facilitated by high index contrast between LN and substrate with properties of near-zero-index via hyperbolic metamaterial structure design. By tailoring the multi-layers structure of hyperbolic metamaterials, the anapole excitation wavelength can be tuned at different wavelengths. It indicates that an enhanced SHG can be achieved at a wide range of pump light wavelengths via different design of the epsilon-near-zero (ENZ) hyperbolic metamaterials substrates. The proposed nanostructure in this work might hold significances for the enhanced light–matter interactions at the nanoscale such as integrated optics.
Boron nitride for excitonics, nano photonics, and quantum technologies
Authors: Gil Bernard , Cassabois Guillaume , Cusco Ramon , Fugallo Giorgia , Artus Lluis
Published: June 2020

We review the recent progress regarding the physics and applications of boron nitride bulk crystals and its epitaxial layers in various fields. First, we highlight its importance from optoelectronics side, for simple devices operating in the deep ultraviolet, in view of sanitary applications. Emphasis will be directed towards the unusually strong efficiency of the exciton–phonon coupling in this indirect band gap semiconductor. Second, we shift towards nanophotonics, for the management of hyper-magnification and of medical imaging. Here, advantage is taken of the efficient coupling of the electromagnetic field with some of its phonons, those interacting with light at 12 and 6 µm in vacuum. Third, we present the different defects that are currently studied for their propensity to behave as single photon emitters, in the perspective to help them becoming challengers of the NV centres in diamond or of the double vacancy in silicon carbide in the field of modern and developing quantum technologies.
Spatial multiplexing holographic combiner for glasses-free augmented reality
Authors: Shi Jiacheng , Qiao Wen , Hua Jianyu , Li Ruibin , Chen Linsen
Published: June 2020

Glasses-free augmented reality is of great interest by fusing virtual 3D images naturally with physical world without the aid of any wearable equipment. Here we propose a large-scale spatial multiplexing holographic see-through combiner for full-color 3D display. The pixelated metagratings with varied orientation and spatial frequency discretely reconstruct the propagating lightfield. The irradiance pattern of each view is tailored to form super Gaussian distribution with minimized crosstalk. What’s more, spatial multiplexing holographic combiner with customized aperture size is adopted for the white balance of virtually displayed full-color 3D scene. In a 32-inch prototype, 16 views form a smooth parallax with a viewing angle of 47°. A high transmission (>75%) over the entire visible spectrum range is achieved. We demonstrated that the displayed virtual 3D scene not only preserved natural motion parallax, but also mixed well with the natural objects. The potential applications of this study include education, communication, product design, advertisement, and head-up display.
Dynamics of carbon nanotube-based mode-locking fiber lasers
Authors: Huang Lin , Zhang Yusheng , Liu Xueming
Published: June 2020

Carbon nanotube (CNT) can work as excellent saturable absorber (SA) due to its advantages of fast recovery, low saturation intensity, polarization insensitivity, deep modulation depth, broad operation bandwidth, outstanding environmental stability, and affordable fabrication. Its successful application as SA has promoted the development of scientific research and practical application of mode-locked fiber lasers. Besides, mode-locked fiber laser constitutes an ideal platform for investigating soliton dynamics which exhibit profound nonlinear optical dynamics and excitation ubiquitous in many fields. Up to now, a variety of soliton dynamics have been observed. Among these researches, CNT-SA is a key component that suppresses the environmental perturbation and optimizes the laser system to reveal the true highly stochastic and non-repetitive unstable phenomena of the initial self-starting lasing process. This review is intended to provide an up-to-date introduction to the development of CNT-SA based ultrafast fiber lasers, with emphasis on recent progress in real-time buildup dynamics of solitons in CNT-SA mode-locked fiber lasers. It is anticipated that study of dynamics of solitons can not only further reveal the physical nature of solitons, but also optimize the performance of ultrafast fiber lasers and eventually expand their applications in different fields.
Radnička kultura kao uporište društvenog sjećanja
Authors: Ćurković Jozefina
Published: June 2020

Rad donosi studiju slučaja propale tvornice konca i pamučnog prediva Dalmatinka u Sinju, s fokusom na radničku kulturu kao uporište društvenog sjećanja. Počevši s historijatom tvornice, preko koncepta radništva u kontekstu jugoslavenskog socijalizma, u tekstu se detektiraju ključni elementi za konstrukciju sjećanja radnika na tvornicu. Na temelju kazivanja nekadašnjih radnica istražuje se relacija radnik-tvornica kroz međuodnos koncepata životne povijesti i osobne povijesti te u vezi s konstruktom socija­lističkog čovjeka. U posljednjem dijelu rad se koncentrira na suvremene interpretacije nematerijalnog nasljeđa Dalmatinke. Analiza djelovanja izložbeno-edukativnog projekta usmjerenog na revalorizaciju njezina doprinosa razvoju grada u infrastrukturnom, ekonomskom i kulturološkom pogledu pokazuje čvrstu ukotvljenost Dalmatinke u društvenom sjećanju lokalne zajednice.
Leisure, Loafing, and Life as Work
Authors: Bagarić Petar
Published: June 2020

Although leisure and idleness are promoted as a panacea for the problems of postmodern man, everyday logic of postindustrial societies is still subjected to the logic of “total work”. Throughout modernism, the discourse of leisure allowed for a certain separation of the worker from the work regime. However, this discourse lost its function in postmodernism due to the contemporary erasure of boundaries between life, work, and the self. The disappearance of these boundaries, due to technological development and newer forms of work organization, is an important element on the basis of which the contemporary middle class gradually assumes the position of the former working class within the system. Thus, it can be concluded that the fundamental way in which the avoidance of the world of total work is possible today is not leisure, free, fulfilled, and meaningful time, but shallow loafing, a stolen free moment otherwise scheduled for work.
Postdramatic Tragedy and Fear
Authors: Bauer Una
Published: June 2020

This article engages with conceptual constellations which allow a contemporary postdramatic theatre production, specifically Socìetas Raffaello Sanzio’s theatrical series Tragedia Endogonidia (2002 – 2004) to be regarded as a tragedy or a series of tragedies. Particular emphasis is given to the role of fear in understanding Tragedia Endogonidia as a tragedy. My claim is that Tragedia Endogonidia contributed to the modification of contemporary understanding of tragedy to, at the same time, a more abstract and a more explicitly material one, where the anchoring of the tragic into a concrete human destiny and the resolution of a plot is replaced by “plotting of the sensorial” or “plotting of the image”, driven by anticipation directly related to an unspecified feeling of discomfort and fear.
Anne Marie Aubert. Coordonnatrice au Conseil du système alimentaire montréalais
Authors: Doyon Mélanie
Published: June 2020

Créé en 2014, le Système alimentaire montréalais a pour mission d’assurer un leadership régional fort en matière d’alimentation en mobilisant les acteurs, en conseillant les décideurs et en appuyant des initiatives structurantes. En 2018, l’agglomération de Montréal s’est dotée d’un premier conseil des politiques alimentaires pour le Système alimentaire montréalais (le CSAM), qui regroupe près de 20 membres issus de différents secteurs. La coordination de ce conseil a été confiée à Anne Marie Aubert, spécialiste du développement des organisations et des politiques
Stabilizacija krhotina razrušenih stijena zagađenih otpadnom isplakom
Authors: Marinović Slavica , Čizmek Vedrana , Uzorinac Nasipak Nada , Goričnik Tihana , Troskot Čorbić Tamara
Published: June 2020

U hrvatskoj naftnoj industriji godišnje se proizvodi značajna količina krhotina razrušenih stijena. Krhotine razrušenih stijena zagađene su otpadnom isplakom te spadaju u heterogeni otpad koji sadrži ugljikovodike, teške metale i kloride. Trenutačno se kao metoda zbrinjavanja krhotina primjenjuje metoda stabilizacije uz pomoć vapna i pijeska. Opisan je postupak pripreme stabiliziranog otpada u laboratorijskim uvjetima na dva uzorka krhotina iz isplačnih jama s područja Dravske depresije. Prije pripreme stabiliziranog otpada u laboratorijskim uvjetima, u početnom uzorku otpada određen je udio organske tvari dobiven ekstrakcijom s organskim otapalom te sadržaj ukupno topljive tvari u vodi. Na temelju te dvije osnovne analize određena je količina vapna i pijeska potrebna za izradu stabiliziranog otpada. Fizikalno-kemijske značajke početnog i stabiliziranog otpada analizirane su primjenom standardnih laboratorijskih metoda. Rezultati su pokazali da miješanje otpada s vapnom i pijeskom omogućuje prevođenje početnog uzorka otpada klasificiranog kao opasan otpad u neopasan otpad.
La ramificación ontológica: evaluación crítica de la antropología contemporánea
Authors: Perdomo Marín Juan Camilo
Published: June 2020

Este artículo presenta una revisión de los debates ontológicos en la antropología contemporánea. Para esta tarea, primero, se identificarán las condiciones históricas y epistemológicas que posibilitaron y guiaron su surgimiento; segundo, se caracterizarán panorámicamente sus ramificaciones teóricas, haciendo hincapié en los elementos comunes que las agrupan, junto con las particularidades y los desencuentros que las diferencian; por último, se realizará una evaluación crítica de sus principales ponentes, con el fin de develar posibles falencias y potencialidades. Este ejercicio, en suma, permitirá comprender lo que puede significar hacer antropología en el presente y hacia a dónde tiende a apuntar su futuro.
Measuring Genome Sizes Using Read-Depth, k-mers, and Flow Cytometry: Methodological Comparisons in Beetles (Coleoptera)
Authors: Pflug James M. , Holmes Valerie Renee , Burrus Crystal , Johnston J. Spencer , Maddison David R.
Published: June 2020

Measuring genome size across different species can yield important insights into evolution of the genome and allow for more informed decisions when designing next-generation genomic sequencing projects. New techniques for estimating genome size using shallow genomic sequence data have emerged which have the potential to augment our knowledge of genome sizes, yet these methods have only been used in a limited number of empirical studies. In this project, we compare estimation methods using next-generation sequencing (k-mer methods and average read depth of single-copy genes) to measurements from flow cytometry, a standard method for genome size measures, using ground beetles (Carabidae) and other members of the beetle suborder Adephaga as our test system. We also present a new protocol for using read-depth of single-copy genes to estimate genome size. Additionally, we report flow cytometry measurements for five previously unmeasured carabid species, as well as 21 new draft genomes and six new draft transcriptomes across eight species of adephagan beetles. No single sequence-based method performed well on all species, and all tended to underestimate the genome sizes, although only slightly in most samples. For one species,Bembidionsp. nr.transversale, most sequence-based methods yielded estimates half the size suggested by flow cytometry.
La evolución de Hezbolá como movimiento social: de ‘liberador’ a contrarrevolucionario (1985 – 2019).
Authors: Dominguez de Olazabal Itxaso
Published: June 2020

Este artículo recurre a la teoría de los movimientos sociales y los llamados procesos de encuadre (framing) para probar que el comportamiento y acciones de Hezbolá frente a los levantamientos que comenzaron a final de 2010 no se han fundamentado en sus principios ideológicos, sino que la organización ha actuado como un movimiento pragmático guiado por sus necesidades estratégicas. Hezbolá apoyó sin ambages los levantamientos que encendieron la chispa de la llamada ‘Primavera Árabe’ en Túnez, Egipto, Libia, Yemen y Bahréin, dirigidos contra regímenes hostiles a Nasrallah y los suyos, recurriendo a un encuadre completamente alineado con su ideología, pero se vio obligada a contradecir sus principios ideológicos cuando el levantamiento estalló contra un régimen cuya supervivencia era vital para su propia existencia.
Tecnologías de la Información y la Comunicación: modelo uno a uno
Authors: Escauriza Patricia , Rappoport Soledad
Published: June 2020

La progresiva incorporación de las Tecnologías de la Información y Comunicación (TIC) en el campo educativo se ha visto como una oportunidad para mejorar las estrategias docentes y facilitar el acceso a la información y conocimientos de los estudiantes. Las tendencias internacionales que invitan a pensar la relación entre las TIC y la calidad de la educación han influido para que los gobiernos empiecen a desarrollar políticas y programas específicos en esta dirección. En este contexto, se ha desarrollado el modelo 1:1. Este artículo tiene por objetivo comprender la influencia de este modelo en los procesos de cambio y mejora escolar, y proponer recomendaciones para su adecuada implementación en centros de educación primaria.
Approximations for sums of three-valued 1-dependent symmetric random variables
Authors: Liaudanskaitė Gabija , Čekanavičius Vydas
Published: June 2020

The sum of symmetric three-point 1-dependent nonidentically distributed random variables is approximated by a compound Poisson distribution. The accuracy of approximation is estimated in the local and total variation norms. For distributions uniformly bounded from zero,the accuracy of approximation is of the order O(n–1). In the general case of triangular arrays of identically distributed summands, the accuracy is at least of the order O(n–1/2). Nonuniform estimates are obtained for distribution functions and probabilities. The characteristic functionmethod is used.
Controllability of conformable differential systems
Authors: Wang Xiaowen , Wang JinRong , Fečkan Michal
Published: June 2020

This paper deals with complete controllability of systems governed by linear and semilinear conformable differential equations. By establishing conformable Gram criterion and rank criterion, we give sufficient and necessary conditions to examine that a linear conformable system is null completely controllable. Further, we apply Krasnoselskii’s fixed point theorem to derive a completely controllability result for a semilinear conformable system. Finally, three numerical examples are given to illustrate our theoretical results.
ENVIRAD – A Database Integration for Environmental Samples Radiological Data
Authors: Gonzalez Sergio de Albuquerque , Silva Tadeu Augusto de Almeida , Conti Claudio de Carvalho , Osvath Iolanda , Ramadan Hussein , Bartocci Jean
Published: June 2020

With the increasing use of databases for environmental radiological monitoring in soils, food, water and sediments, among others, there is a demand for integrating this kind of information availability, aiming at a data management for greater searchability for the most varied purposes. ENVIRAD is a proposal to integrate these databases, providing researchers with a tool for a more complete analysis of the environment’s study. ENVIRAD, as developed so far, works with the integration of the following databases: MARIS, GLOMARD, GEORAD and SIGLARA databases, enabling queries and demonstrating great potential in the use of data integration for environmental samples.
THE RHIZOMATIC LEARNING FROM A PERSPECTIVE OF POSTSTRUCTURALISM
Authors: Kairiené Aida
Published: June 2020

Aim.The postmodernism manifested itself in the second half of the 20th century. The branch of postmodernism is poststructuralism - in fact, it was called French poststructuralism, with the dominant philosophy being “68 philosophy” (Marshall, 2004). In that period, alongside influential works such as Derrida “On Grammatology” (1968), M. Foulcalt “The Madness and Civilization” (1967), J. Kristeva “Semiotics” (1969) emerged and Deleuze, Guattari personalities. According to the Eurydice study, 9 out of 10 students in the European Union study English. Students can learn English not only in formal but also in non-formal and informal forms.  This enables the development of rhizomatic learning, which origins lie in Deleuze, Guattari (2004) philosophy.  Thus, the problem – related question arises: what is the essence of rhizomatic learning from a perspective of poststructuralism? The aim of the study is to review theoretical considerations in order to reveal the essence of rhizomatic learning from a perspective of poststructuralism.

Method.The research method – a scientific literature review. The literature review examines relevant, current, and recent literature (Grant & Booth, 2009). The literature review is based on philosophical and educational insights. The following sources have been selected for the analysis of rhizomatic learning of English: 1) philosophical and educational books that help to reveal the essence of rhizomatic learning; 2) publications and dissertations on the issue of rhizomatic learning, which helped to analyse the essence of rhizomatic learning from a perspective of poststructuralism.

Results. The antecedents of rhizomatic learning are rhizome and other Deleuze Guattari's (2004) concepts as assemblages, becoming, nomad. The rhizomatic learning based on Deleuze Guattari's (2004) term of rhizome, which has neither beginning nor end (Cormier, 2008), providing a dynamic, open, personalized learning network created by learners themselves that meets their perceived and real needs (Lian, Pineda, 2014). The concept of rhizomatic learning has its own meaning, but is closely related to the concepts of Deleuze, Guattari (2004), such as rhizome, assemblage, becoming, nomad, and so on. It should be noted that the rhizomatic learning from poststructuralism perspective develops and manifests itself through various 'moving' Deleuze, Guattari’s (2004) concepts.  The consequences of rhizomatic learning show that rhizomatic learning could be applied successfully in educational science as learning foreign languages in various learning forms.

Conclusion. The scientific analysis revealed that rhizomatic learning develops through Deleuze, Guattari concepts, especially through becoming learner and occurs in lifelong learning of English.
SOCIAL NETWORKS AS A SUPPORT IN THE OLD AGE IN SPAIN
Authors: AGUDO PRADO SUSANA , García-Sampedro Marta
Published: June 2020

Aim. This article presents the results of research whose aim is to establish if social networks are useful tools to promote social relationships and support for the elderly citizens.

Method. One hundred thirty people over the age of 65 participated in the research. For this purpose, the scale “elderly people and social network” (elaborated ad hoc) was applied.

Results and conclusion. The results obtained through descriptive analysis of the gathered data indicate that social networks provide support for elderly people who had already acquired digital competence in the past. The study also reveals that there are personal variables, especially of an educational nature, that determine the acquisition of an active role as generators and producers of digital content (prosumers). In conclusion, it could be said that social networks have a positive influence on the well-being of the elderly and their fight against undesirable loneliness. The more heterogeneous the social network is, the more active the elderly people are.
About one method for replacing variables for a wavean equation describing vibrations of systems with moving boundaries
Authors: Anisimov Valery N. , Litvinov Vladislav L.
Published: June 2020

An analytical method for solving the wave equation describing the oscillations of systems with moving boundaries is considered. By replacing variables that set boundaries and leave the equation invariant, the original boundary value problem is reduced to a system of functional – difference equations that can be solved using forward and reverse methods. The inverse method is described, which allows us to apply sufficiently diverse laws of boundary motion to the laws obtained from the solution of the inverse problem. New partial solutions for a fairly wide range of boundary motion laws are obtained. A direct asymptotic method for approximating the solution of a functional equation is considered. The errors of the approximate method are estimated depending on the speed of the border movement.
Mostra Científica como prática diferenciada na formação inicial de professores
Authors: Varela Lavinia Kelly de Sa Leitao , Oliveira Janety Brunna Souza , Azevedo Francisca Francilene Candido , Lemos Paulo Henrique Macedo , Almeida Diogo Yuri , Bezerra Diogo Pereira
Published: June 2020

A sociedade contemporânea na qual se vive necessita de futuros cientistas, bem como de profissionais capacitados para sua proficiente formação. Com base no contexto vivido pela sociedade atual é primordial e relevante que a iniciação científica tenha sua abertura ainda na formação básica; e que os professores da área científica em questão possam estimular o desenvolvimento no que diz respeito ao caráter científico nos alunos. O presente trabalho se apresenta como um ensaio cuja finalidade engloba a reflexão sobre as contribuições da elaboração de Mostras Científicas e o impacto positivo desse evento na formação inicial de professores assim como também na aprendizagem dos alunos da rede básica. Partindo desse ideal, foi realizada uma Mostra Cientifica no Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, Campus Ipanguaçu, onde foram realizadas entrevistas com alunos e professores presentes. Os resultados obtidos foram satisfatórios. Na formação de licenciados não é somente a teoria que contribui com o desenvolvimento, é necessária uma participação mais próxima do ambiente escolar e seus desafios.