bluuebunny/crossref_metadata_2025 huggingface dataset:
Mapping coupled time-series onto a complex network
Authors: Ardalankia Jamshid , Askari Jafar , Sheykhali Somaye , Haven Emmanuel , Reza Jafari G.
Published: January 2021

In order to extract hidden joint information from two possibly uncorrelated time-series, we explored the measures of network science. Alongside common methods in time-series analysis of the economic markets, the mapping joint structure of two time-series onto a network provides insight into hidden aspects embedded in the couplings. We quantise the amplitude of two time-series and investigate relative simultaneous locations of those amplitudes. Each segment of a quantised amplitude is considered as a node. The simultaneity of the amplitudes of the two time-series is considered as the links in the network. The frequency of occurrences forms the weighted links. In order to extract information, we need to measure to what extent the coupling deviates from the coupling of two uncoupled series. Also, we need to measure to what extent the couplings inherit their charachteristics from a Gaussian distribution or a non-Gaussian distribution. We mapped the network from two surrogate time-series. The results show that the couplings of markets possess some features which diverge from the same features of the network mapped from white noise, and from the network mapped from two surrogate time-series. These deviations prove that there exist joint information and cross-correlation therein. By applying network's topological and statistical measures and the deformation ratio in joint probability distribution, we distinguished basic structures of cross-correlation and coupling of cross-markets. It was discovered that even two possibly known uncorrelated markets may possess some joint patterns with each other. Thereby, those markets should be examined as coupled and weakly coupled markets.
Paddymania Returns to America (and Poland)
Authors: Cioffi Kathleen
Published: January 2021

Kathleen Cioffi provides an overview of the ambitious Paderewski Musical Project, examining the collision of American and Polish dramaturgies across three pieces—3 Paderewskis, Virtuoso, and Memory Laws. All three were part of a 2017 competition encouraging American writers to propose a musical celebrating Poland’s hundred-year anniversary of independence by valorizing Jan Paderewski. Cioffi concludes that the nationalistic impulses of the right-wing government are shielded by their choice of American artists for a state-sponsored project, and of Paderewski, household name and national hero, as the subject.
High infectious disease burden as a basis for the observed high frequency of asymptomatic SARS-CoV-2 infections in sub-Saharan Africa
Authors: Kusi Kwadwo Asamoah , Frimpong Augustina , Partey Frederica Dedo , Lamptey Helena , Amoah Linda Eva , Ofori Michael Fokuo
Published: January 2021

Following the coronavirus outbreaks described as severe acute respiratory syndrome (SARS) in 2003 and the Middle East respiratory syndrome (MERS) in 2012, the world has again been challenged by yet another corona virus, named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). SARS-CoV-2 infections were first detected in a Chinese Province in December 2019 and then declared a pandemic by the World Health Organization in March 2020. An infection caused by SARS-CoV-2 may result in asymptomatic, uncomplicated or fatal coronavirus disease 2019 (COVID-19). Fatal disease has been linked with the uncontrolled “cytokine storm” manifesting with complications mostly in people with underlying cardiovascular and pulmonary disease conditions. The severity of COVID-19 disease and the associated mortality has been disproportionately lower in Africa and Asia in comparison to Europe and North America in terms of number of cases and deaths. While persons of colour who live in Europe and North America have been identified as a highly susceptible population due to a combination of several socioeconomic factors and poor access to quality healthcare, this has not been the case in sub-Saharan Africa where inhabitants are even more deprived concerning the said factors. On the contrary, sub-Saharan Africa has recorded the lowest levels of mortality and morbidity associated with the disease, and an overwhelming proportion of infections are asymptomatic. This review discusses the most probable reasons for the significantly fewer cases of severe COVID-19 disease and deaths in sub-Saharan Africa.
Nicolai Hartmann and the Transcendental Method
Authors: Pietras Alicja
Published: January 2021

One of the most often explored, repeatedly interpreted, and recognized again and again as a valuable achievement of Kant’s philosophy, is his transcendental philosophy, a new methodological approach that – as Kant believed – will allow philosophy (metaphysics) to enter upon a secure path of science. In this paper, I explore Nicolai Hartmann’s reinterpretation and development of this methodology in both the historical and systematic context of his thought. First, I will deal with the Neo-Kantian’s understanding of the transcendental method as a starting point of Hartmann’s own understanding of it. Then I will analyze in detail his only paper devoted entirely to the problem of the method, (Hartmann, 1912), to present how he understands the necessary development of this methodology. I will claim that despite the fact that Hartmann – following Kant – never denied that the real essence of philosophy is the transcendental method, he tried to show that this methodus philosophandi cannot be reduced to the Neo-Kantian’s understanding of it. He argued that the core of all true philosophical and scientific research is the transcendental method, but only insofar as it is accompanied by two other methods that are needed to complete it: descriptive and dialectical method. I will close by presenting the relations between these three methods.
Alentando la autonomía en la educación superior: modelo de un centro de autoaprendizaje.
Authors: Giovanna Tassinari Maria
Published: January 2021

Implementing autonomy in language learning and teaching in most institutional contexts is still, even after decades of research and practice, a challenge for teachers and learners. Facing these challenges may be easier, if this is done not in isolation, but rather as part of a learning and teaching community. My experience at the Centre for Independent Language Learning (CILL) at the Language Centre of the Freie Universität Berlin is that the first step towards implementing autonomy is encouraging it while building a community of practice. For teachers, a community of practice means the opportunity to discuss their understanding of autonomy, to share and reflect experiences, to develop common strategies both for teaching and for addressing the administration, if need be. An even better opportunity to build a learning culture based on autonomy is to support teachers and learners to exchange their perspectives and cooperate towards a common understanding of (more) autonomous teaching and learning. One of the aims of the CILL is to create opportunities for such an exchange, involving student assistants and teachers to reflect on the provision of the CILL and to help to further develop it.
Cine español en la Argentina: La exportación del nacionalismo ruralista.
Authors: Diez Puertas Emeterio
Published: January 2021

The first Francoism created a film policy based on autarky, that is, on strict control of foreign trade for both economic and ideological reasons. It was necessary to control the balance of payments and the ideology of foreign governments. This is how, after the Second World War, Argentina became the main partner of the regime. Above all because the importation of cereals is vital to alleviate hunger. Moreover, to solidify these relationships, a cultural exchange is encouraged in which the cinema plays an important role. Specifically, the purpose of these pages is to study the commercial, artistic, moral, and critical impact of the Spanish rural drama exported by Spain to Argentina in the period from 1944 to 1947. It is intended to show that this cinema served to disseminate the national ruralist ideology among Argentines and, above all, among the colony of Spanish emigrants, many of them from the countryside.
Nuevas figuras de la Revolución cubana: las mujeres en el Noticiero ICAIC Latinoamericano, 1960-1990.
Authors: Pérez Laure
Published: January 2021

This article studies women’s representation in the Noticiero ICAIC Latinoamericano, the Cuban Revolution’s newsreel, directed by Santiago Álvarez. It was shown every week between 1960 and 1990, covering aspects of international and national news. It became an important audiovisual tool to spread revolutionary ideas in Cuba. Thus, this article studies the Noticiero ICAIC referring to the concept of “political mediation”: it fulfilled a mediatory function, between Cuban leaders and the people, in the process of building a new society. In the concrete case of women, their representation centers around three protagonists, who also are three possible ways for them to participate in the revolutionary society: the worker, the sportswoman and the militianwoman. With these new feminine representations, the Noticiero ICAIC reflects and gives legitimacy to social and economic changes that can be observed in revolutionary Cuba, especially women’s participation in productive labor. It also contrasts with traditional representations of femininity, associated with the domestic sphere. This article studies these three feminine representations analyzing examples taken from the Noticiero ICAIC’s weekly editions, that can be short reports or editions enterely dedicated to women’s situations
Mediaciones de la violencia franquista en el cine español del siglo XXI.
Authors: Ducellier Aurore
Published: January 2021

From Butterfly’s Tongue (1999) to While at War (2019), a growing number of cinematographic fictions and documentaries depicted Franco's repression in a context of recovery of historical memory. Thus, at least forty movies from this beginning of the century allude to the maquis, prisoners and victims as a whole to denounce the violence of the dictatorship in the media. The cinema mediates memory in the public scene and tries to modify, through a plural construction, the reception of this repressive period in the collective memory. We propose to explore the evolution of the message about Franco's violence in the cinema of these last two decades, with a typology of the victims, the representations of repression and the ideological narratives that are faced in them: through cinematographic techniques and characters, as well as the use and alteration of the symbols of this violence, which place it in a moving reception area.
CON EL MAZO DANDO. REPRESIÓN A LA PRENSA ESPAÑOLA TRAS EL DESASTRE
Authors: Lima Sarmiento Edel
Published: January 2021

After the final defeat in the war against the United States, the Spanish government suspended constitutional rights from July 14th, 1898 to February 8th, 1899, afraid of internal uprising and the critical scrutiny of the press. For this reason, during this period two types of press control policies were implemented: preventive and repressive. This article focuses on the later approach and its operating mechanisms. Based on hemerographic analysis, this paper shows that the most frequent repressive methods were the closing of publications and court martials against publishers and journalists. These mechanisms did not always abide by pre-publication censorship. When independent from it, they acted more as a post-publication censorship mechanism. Likewise, following these punitive measures, publications covered the phenomenon and even protested the measures
Extended School Time: Impact on Learning and Teaching
Authors: Mendes Pedro Cabral , Leandro Cristina Rebelo , Campos Francisco , Fachada Miguel , Santos Ana Paula , Gomes Ricardo
Published: January 2021

This paper presents and assesses the effects of an Extended School Time project (ESTp), with a working day of 8 contact hours, that aimed to develop the students as a whole in its academic, artistic, sport, social and human dimensions. Based in active and integrated pedagogical practices, the project promoted the integration of knowledges, curiosity, sense of criticism, creativity, sharing solidarity and the conviviality of students. This project was applied to a 6th grade class with 20 pupils (11.2±0.68 years old). Using a qualitative methodology, 13 semi structured interviews were applied to 3 types of participants: 6 pupils, 5 parents (42.6±4.54 years old) and 2 teachers (60±4 years old), in order to analyze their perceptions regarding the project. Results show that each group valued different aspects of the project. The pupils valued activities that emphasized challenge, communication, creativity, and autonomy, as well as activities of academic continuity. The parents focused mostly on the occupational component of Extended School Time (ESTp), and the teachers on its effects on social and self-development of the pupils. This development was reflected in an improved peer-to-peer relationship and in a greater sense of belonging to school. The convergence verified in this ESTp, between cognition and the artistic, social and sport education, sought to promote the main goal of the School, an instruction that promotes a global (including multicultural and universal) development of the pupils’ capabilities.
Are Teachers Aware of Mathematics Learning Disabilities? Reflections from Basic Level Schoolteachers of Nepal
Authors: Kunwar Rajendra , Shrestha Bhupal Kumar , Sharma Lekhnath
Published: January 2021

The study aims at investigating basic level schoolteachers' awareness of their students' mathematics learning disability (MLD) in the context of Nepal. It is based on a mixed-method research design in that it combines both qualitative and quantitative approaches as appropriate. Using the stratified random sampling technique, 300 basic level mathematics teachers were selected from 150 basic level (grades 1-8) community and institutional schools representing the three significant ecological regions (the Mountain, the Hill, and the Terai) and demographic variables (gender, place of residence, and school type) from Province 1 of Nepal. A Mathematics Learning Disability Awareness Scale (MLDA-Scale), was developed and used to measure the basic level schoolteachers' awareness of their students' MLD. Besides, a semi-structured interview was conducted with the purposively selected basic level schoolteachers for the qualitative data. The basic level schoolteachers' awareness of MLD factor categories was calculated using descriptive statistics. Similarly, t-tests were conducted to examine the effects of the demographic variables. The qualitative data, however, were analyzed thematically. The results reveal that the majority of the basic level schoolteachers' knowledge toward their students' MLD was inadequate and that the demographic variables had no significant effects on the teachers' knowledge of their students' MLD. Finally, the study recommends developing the managerial practices regarding the MLD issue further.
Private surgery clinics in an open medical market: Barcelona, 1880s-1936
Authors: Zarzoso Alfons
Published: January 2021

The main purpose of this article is to examine how a new medical technology – the operating room- resulted in the establishment of a model of private clinics in late 19th – century Barcelona. This research explains that this kind of private medical care happened in an open medical market and successfully met a growing demand. Since its origins in the 1880s, private surgery clinics rose to more than 50 in just half-a-century. Here, several business strategies put at work by those surgeons-entrepreneurs are considered, especially those related to publicity and the search of patients/customers. Several aspects played a paramount role in that success: medical technology, domestic comfort, and surgical efficacy. In a context where medical care delivered at hospital was provided by the city-state or the local bourgeoisie as a part of the medieval model of charity, a potential customer for the private surgery clinics was formed by the urban, popular and working classes through the model of mutual aid societies and health insurance companies. Moreover, private clinics also showed how the process of medical specialization was configured and what kind of relationships surgeons-entrepreneurs established with general practitioners to attract their patients. Here, medical directories and medical journals reveal as a useful source of information.
Innovation and entrepreneurship in Catalan private laboratories: origins and rise of Grifols Lab (1880-1955)
Authors: Sans-Ponseti Cristina , Fernández-Pérez Paloma
Published: January 2021

Studying the evolution of private medical clinics is extremely useful in understanding the history of the Catalan healthcare system where, from the 19th century onwards, a Marshallian atmosphere of flows of knowledge, people and technology has resulted in close connections between the public and private practice of modern medicine. The history of the Grifols Laboratories, from 1880 to the 1950s, is a relevant case study in this context, as it highlights patterns that were repeated in other medical laboratories in Catalonia a century ago. But Grifols is also particularly interesting both because of its survival and evolution to this day, and for its curation of its own historical archive.This article aims to understand how a small laboratory in the healthcare district of Barcelona built its scientific foundations on laboratory medicine during the early 20th century, and finally changed its business strategy because of the Spanish Civil War, becoming a family pharmaceutical company. The sources are documents from the Grifols archive and interviews with managers at the company. The findings highlight the importance of interdisciplinary analysis, suggesting that both scientific and business adaptations by successive generations are equally important in explaining the success of Grifols Laboratories. Science-based family firms that endure over time not only acquire specialised knowledge to compete in the market, but also knowledge about transferring entrepreneurship in the long term. In Grifols case, knowledge from younger generations was crucial to adapting their activity, first to a changing scientific paradigm and then to a precarious national market.
TAMIR, Yael (2019). Why Nationalism. New Jersey: Princeton University Press
Authors: Leyva Karel J.
Published: January 2021

Reseña de:  TAMIR, Yael (2019). Why Nationalism. New Jersey: Princeton University Press, 205 Págs.
Maquiavel e o governo das leis: a relação entre as leis, as instituições políticas e o conflito
Authors: Morais Ricardo Manoel Oliveira
Published: January 2021

O objetivo é analisar as contribuições maquiavelianas para pensar o surgimento das boas leis e instituições políticas a partir do conflito. Para Maquiavel, uma comunidade política bem ordenada é aquela na qual boas leis (produzidas com ampla participação) governam. Com isso, será observado que Maquiavel foi um defensor de um governo que se regesse por leis estabelecidas por um processo participativo e conflitivo. Primeiramente será examinado que o conflito, para Maquiavel, é uma marca ontológica da política, ou seja, não pode ser extirpado, razão pela qual as cidades devem ordená-los para que eles não gerem efeitos nocivos. Após, será observado que numa cidade bem ordenada, os conflitos criam um campo propício para boas leis e ordenações se consolidarem.
La acción global por el clima y la importancia de los jóvenes en el movimiento por la justicia climática
Authors: De Armenteras Cabot Marcos
Published: January 2021

En este artículo se analiza el movimiento por la justicia climática y la importancia que tienen los jóvenes dentro del movimiento. A día de hoy, los jóvenes son una pieza fundamental en la lucha por el clima y su voz está muy presente en el movimiento. Las marchas más multitudinarias en los últimos años han sido lideradas por jóvenes de todo el mundo. El marco discursivo de las huelgas estudiantiles y los “viernes por el futuro” se fundamenta. en la justicia intergeneracional y la necesidad de llevar a cabo políticas sobre el clima a largo plazo. En este artículo doy cuenta del movimiento por la justicia climática y el ascendente rol de los jóvenes y la justicia intergeneracional en su discurso.
Interprofessional Abortion Opposition: A National Survey and Qualitative Interviews with Abortion Training Program Directors at U.S. Teaching Hospitals
Authors: Bennett Ariana H. , Freedman Lori , Landy Uta , Langton Callie , Ly Elizabeth , Rocca Corinne H.
Published: January 2021

CONTEXT

Hospital policies and culture affect abortion provision. The prevalence and nature of colleague opposition to abortion and how this opposition limits abortion care in U.S. teaching hospitals have not been investigated.

METHODS

As part of a mixed‐methods study, a nationwide survey of residency and site directors at 169 accredited obstetrics‐gynecology training programs was conducted in 2015–2016, and 18 in‐depth interviews with program directors were conducted in 2014 and 2017. The prevalence and nature of interprofessional opposition were examined using descriptive statistics, and regional differences were investigated using logistic regression. A modified grounded theoretical approach was used to analyze interview data.

RESULTS

Among the 91% of survey respondents who reported that they or their colleagues had wanted or needed to provide abortions in the prior year, 69% faced opposition from colleagues. Most commonly, opposition came from nurses (58%), nursing administration (30%) and anesthesiologists (30%), manifesting as resistance to participating in or cooperating with procedures (51% and 38%, respectively). Fifty‐nine percent of respondents had denied care to patients in the prior year because of colleagues’ opposition. Respondents in the Midwest and South were more likely than those in the Northeast to deny abortion care to patients because of such opposition (odds ratios, 3.2 and 4.4, respectively). Interviews revealed how participants had to circumvent opposing colleagues, making abortion provision difficult and leading to delays in and, infrequently, denial of abortion care.

CONCLUSIONS

Interprofessional opposition to abortion is widespread in U.S. teaching hospitals. Interventions are needed that prioritize patients’ needs while recognizing the challenges hospital colleagues face in their abortion participation decisions.
All-fiber Fabry–Pérot interferometer for reducing noise on the basis of
differential structure
Authors: Liang Hongwei , Liu Dongdong , Kan Lingling
Published: January 2021

In this study, we propose a new optical fiber interferometer based on
differential structure. The phase delay exists in the two output arms
of the coupler. When the interference signal passes through the phase
delay twice in the transmission, it produces a phase shift of

π

with the original signal. This
feature can be used to differentially reduce noise. The experimental
results show that the signal-to-noise ratio increases by 1.29 dB, and
the waveform of the reconstructed signal is reduced by 12 nm. Thus,
the structure can effectively improve the quality of the measured
signal.
Three-dimensional volumetric deconvolution in coherent optics and holography
Authors: Latychevskaia Tatiana
Published: January 2021

Methods of three-dimensional deconvolution (3DD) or volumetric deconvolution of optical complex-valued wavefronts diffracted by 3D samples with the 3D point spread function are presented. Particularly, the quantitative correctness of the recovered 3D sample distributions is addressed. Samples consisting of point-like objects can be retrieved from their 3D diffracted wavefronts with non-iterative (Wiener filter) 3DD. Continuous extended samples, including complex-valued (phase) samples, can be retrieved with iterative (Gold and Richardson–Lucy) 3DD algorithms. It is shown that quantitatively correct 3D sample distribution can be recovered only with iterative 3DD, and with the optimal protocols provided. It is demonstrated that 3DD can improve the lateral resolution to the resolution limit, and the axial resolution can be at least four times better than the resolution limit. The presented 3DD methods of complex-valued optical fields can be applied for 3D optical imaging and holography.
High-stability, high-energy Nd:glass rod regenerative amplifier with compensation for cavity misalignment
Authors: Shi Yusen , Zhang Peng , Jiang Youen , Wang Jiangfeng , Zhou Li , Lu Xinghua , Fan Wei , Li Xuechun , Zhu Jianqiang
Published: January 2021

We report on an Nd:glass large-mode rod regenerative amplifier with a pulse energy of 125 mJ at 1053 nm. The amplifier contains a linear-type resonator, which is designed in Stability Zone II with a misalignment sensitivity factor of 12.9 m. A method is proposed for analyzing the sensitivity of the mode displacement on the gain media to cavity misalignment, and the optimum solution to compensation for cavity misalignment is obtained and applied to the amplifier. The amplifier exhibits excellent energy stability with a fluctuation of 0.47% (RMS) within 7 h and high spatial beam quality with

M
2

=

1.17

. The beam pointing stability in the horizontal and vertical axes within 7 h is 2.7 and 3.6 µrad (RMS), respectively.
Engineering Dielectric Metasurfaces for Chirality-Sorting Optical Forces and Fano-Interference-Enhanced Chirality
Authors: Yao Kan , Zheng Yuebing
Published: January 2021

We propose a design of dielectric metasurfaces that can enhance the optical chirality by 2-3 orders of magnitude for chiral optical forces and sensing. It can also preserve the spin states of light upon reflection.
Skull optical clearing for longitudinal non-invasive optical imaging
Authors: Soleimanzad H. , Juchaux M , Crepin D , Gurden H , Pain. F
Published: January 2021

We have evaluated in vitro and in vivo the efficiency and practicability of a recently proposed approach for minimally invasive, longitudinal imaging of the rodent brain: reversible optical clearing of the skull.
Infrared Supercontinuum Generation in ZrF4 Fibers Pumped by Femtosecond Pulses at 1900 nm
Authors: Voropaev V.S. , Donodin A.I. , Voronets A.I. , Batov D.T. , Vlasov D.S. , Tarabrin M.K. , Lazarev. V.A. , Karasik V.E.
Published: January 2021

We demonstrate a supercontinuum generation in ZrF4 fibers
pumped by 70 and 514 fs pulses at 1.9 µm. The widest obtained
spectral coverage is 1810 - 2580 nm at -10 dB level.
Ultra-high Efficiency Grating Chirp Generators for Fiber-Chip Coupling in Silicon Nitride
Authors: Nambiar Siddharth , Ranganath Praveen , Kallega Rakshitha , Selvaraja Shankar K.
Published: January 2021

We demonstrate high efficiency grating couplers on Silicon Nitride in the C-L band region. The measured efficiency is -1.17 dB for 500 nm thick film and -1.24 dB for 400 nm thick film.
Demonstration of Accelerating and Decelerating Space-Time Optical Wave Packets in Free Space
Authors: Yessenov Murat , Abouraddy Ayman F.
Published: January 2021

We show that sculpting the spatio-temporal spectrum of optical wave packets enables the realization of large axial acceleration and deceleration. We experimentally demonstrate group velocity changes up to ∼ 1.2c over a propagation distance ∼ 30 mm.
Complete Laser System for Strontium Lattice Clock Based on Frequency Comb
Authors: Giunta Michele , Wolferstetter Martin , Lilienfein Nikolai , Holzberger Simon , Saint-Jalm Sarah , Skopnik Florian , Lessing Maurice , Hänsel Wolfgang , Sprenger Benjamin , Fischer Marc , Holzwarth Ronald
Published: January 2021

We report the development of a complete turn-key 5 × 10-16 ultra-stable laser system for operating neutral strontium atoms for optical lattice clocks or for quantum computing.
Generation of a Space-Time Light Sheet with Reduced Diffraction Utilizing Classical Entanglement by Combining Multiple Frequencies Each Containing Multiple Hermite-Gaussian Modes
Authors: Song Hao , Zhao Zhe , Zou Kaiheng , Pang Kai , Minoofar Amir , Su Xinzhou , Zhou Huibin , Zhang Runzhou , Song Haoqian , Hu Nanzhe , Liu Cong , Tur Moshe , Willner Alan E.
Published: January 2021

We simulate a space-time light-sheet with reduced diffraction utilizing classical entanglement between multiple frequencies and Hermite-Gaussian (HG) modes. By increasing the number of modes, the ratio of Rayleigh ranges could be increased to > 10.
Design of Aluminum-based Hybrid Gratings with Predefined Infrared Spectral Response
Authors: Audhkhasi Romil , Povinelli Michelle L.
Published: January 2021

We propose to use aluminum gratings to design absorbers with predefined spectral response. By exploiting the relations between grating structural parameters and spectral properties, we design hybrid gratings to generate multi-resonance spectra.
Terahertz sensing with deep-subwavelength metasurface cavity operating near Fano excitation threshold
Authors: Karmakar Subhajit , Varshney Ravendra K. , Chowdhury Dibakar Roy
Published: January 2021

We propose an efficient deep-subwavelength, thin Fano cavity towards strong terahertzmatter interaction and ultra-sensitive sensing purposes. Operating near Fano excitation threshold leads to nanoscale sensing with maximum sensitivity ~ 1.1 THz/RIU.
Single-mode Topological Valley-Hall lasing at Telecommunication Wavelength
Authors: Noh Wanwoo , Nasari Hadiseh , Kim Hwi-Min , Le-Van Quynh , Jia Zhetao , Huang Chi-Hsin , Kanté Boubacar
Published: January 2021

We report a single-mode valley-Hall laser at telecommunication wavelength. The control of degree of asymmetry in a honeycomb photonic crystal governs light confinement in the valley-Hall cavity and enables systematic single-mode operation despite multiple resonances.
Virtual immunofluorescence staining from reflectance microscopy by deep learning
Authors: Cheng Shiyi , Fu Sipei , Kim Yumi Mun , Yi Ji , Tian Lei
Published: January 2021

A computational alternative to standard immunofluorescence (IF) imaging based on deep learning model is proposed for transforming morphological information from reflectance microscopy to specific and accurate IF predictions with high multiplicity.
High repetition rate detection through dual-comb Vernier frequency division
Authors: Yang Zijiao , Wang Beichen , Zhang Xiaobao , Yi Xu
Published: January 2021

We report a new Vernier frequency division method to detect sub-THz microresonator soliton rep-rate. Our method vastly reduces required electrical bandwidth for rep-rate detection, and we stabilized 200 GHz rep-rate to a 1 GHz reference.
Photoluminescence studies of the resilience of 2D hybrid organic inorganic perovskite to micro-fabrication solvents
Authors: Riisnaes Karl Jonas , De Marco Luisa , Polimeno Laura , Craciun Monica , Russo Saverio
Published: January 2021

The stability of 2D organic-inorganic perovskites to solvents is key to enable the production of pervoskite devices with standard lithography techniques. Systematic studies of resiliance indicate that solvent polarity plays a central role.
Assembly of Nanophotonic Structures Using Optical Tweezers
Authors: Melzer Jeffrey E. , Nguyen Phuong-Diem , Su Judith , McLeod Euan
Published: January 2021

Optical tweezers provide a non-contact three-dimensional (3D) method for nanoscale positioning. We assemble a 3D light guiding structure comprising a chain of gold-silica nanoshells and show structures assembled from hundreds of chemically-linked building blocks.
Pre-chirp managed SPM-enabled spectral selection
Authors: Chen Runzhi , Chang Guoqing
Published: January 2021

We incorporate pre-chirp management into SPM enabled spectral selection to improve efficiency and reshape unfavorable input flat-top pulses. This new technique produces megawatt-level femtosecond pulses tunable in the wavelength range of 0.86-1.3 µm.
Entanglement limits in topological protection of two-photon edge-edge states
Authors: Tschernig Konrad , Jimenez-Galan Álvaro , Christodoulides Demetrios N. , Ivanov Mikhail , Busch Kurt , Bandres Miguel A. , Pérez-Leija Armando
Published: January 2021

We study fundamental limitations to topological protection induced by increasing the amount of entanglement in nonseparable two-photon states. We identify the physics underlying such vulnerability and the conditions for robust protection of two-photon states.
Laser-induced polarization-dependent birefringence in sodium borate glasses
Authors: Lipatiev A. S. , Fedotov S. S. , Lotarev S. V. , Sigaev V. N.
Published: January 2021

The possibility of femtosecond laser-induced polarization-dependent birefringence was demonstrated for the first time in the bulk of sodium-borate glass. The dependence of retardance of laser-induced birefringence on alkali content was studied.
Optical Pumping in Xenon Atoms
Authors: Lamsal H. P. , Franson J. D. , Pittman T. B.
Published: January 2021

We experimentally invistigate the optimal production of metastable xenon using RF discharge techniques combined with optical pumping from an auxiliary state in xenon. This provides a robust platform for producing large long-term metastable densities.
Complementary Optical Systems to Host Conjugate Exceptional Points
Authors: Laha Arnab , Dey Sibnath , Gandhi Harsh K. , Ghosh Somnath
Published: January 2021

We report the hosting of two complex conjugate exceptional points (EPs) in two complementary optical waveguides and explore the nonadiabatic chiral and reverse-chiral modal dynamics in two waveguides following dynamical EP encirclement schemes.
On-chip Nano-localization via Transverse Kerker Scattering
Authors: Bag Ankan , Neugebauer Martin , Mick Uwe , Christiansen Silke , Schulz Sebastian A. , Banzer Peter
Published: January 2021

Here we present a transverse Kerker scattering based sub-wavelength localization technique transferred to a chip-scale all-optical displacement sensing device, which could act as a metrological instrument in modern lithography and microscopy, or monitor system drifts.
Waves with free-space characteristics in non-Hermitian media
Authors: Komis I. , Sardelis S. , Musslimani Z. H. , Makris K. G.
Published: January 2021

We examine a novel type of waves in non-Hermitian media, that have equal intensity with solutions of the paraxial wave equation in bulk space. This correspondence allows us to consider beams/solitons with free-space like characteristics.
Evidence of visible wavelength spontaneous Brillouin scattering in Si3N4 waveguides
Authors: Chauhan Nitesh , Bose Debapam , Straus Michael , Holliman Craig A. , Jayich Andrew M. , Behunin Ryan O. , Blumenthal Daniel J.
Published: January 2021

We report the first direct evidence of visible wavelength spontaneous Brillouin scattering in a photonic integrated waveguide. A Si3N4 spiral is pumped at 674nm and produces a 25.11GHz shifted, 400MHz-wide, Stokes signal, as predicted by simulations.
3D Joints Extraction Using Single Frame Human Body Point Cloud
Authors: Xu Tianxu , An Dong , Wang Zhonghan , Jiang Sicheng , Meng Chengnuo , Wang Qiang , Pan Zhongqi , Yue Yang
Published: January 2021

We demonstrate 3D joints extraction from a single frame human body point cloud captured by a 3D camera. Average normalized error is less than 5.7 cm for 12 joints in the human body.
Anomalous Refraction of Space-time Wave Packets
Authors: Yessenov Murat , Bhaduri Basanta , Abouraddy Ayman F.
Published: January 2021

We formulate and confirm experimentally a new law of refraction for wave packets endowed with judicious spatio-temporal correlations, which reveals an anomalous-refraction regime: the pulse speeds up when traveling from low-index to high-index non-dispersive media.
Terahertz pulses generated by classical or relativistic laser-gas interaction: Sources and Applications
Authors: Bergé L.
Published: January 2021

We review the mechanisms underlying terahertz emission in laser-gas interaction, such as photocurrents at moderate intensities and transition radiation in relativistic plasmas. These open new perspectives in ultrabroadband molecular spectroscopy.
On-Demand Generation of High-Purity Single-Photon Pulses by NV Centers in Diamond under Electrical Excitation
Authors: Khramtsov Igor A. , Fedyanin Dmitry Yu.
Published: January 2021

We study for the first time pulsed electrical excitation of NV in diamond and present a strategy to generate strictly one photon per pulse with a probability of 99% at a rate of 100 kHz.
Modeling of optical propagation through anisotropic biological tissues using Green's functions
Authors: Ganoza-Quintana J. L. , Fanjul-Vélez F. , Arce-Diego J. L.
Published: January 2021

Enhanced contrast by coherence could distinguish malignant from healthy tissues, or provide diagnostic interpretation. In this work, optical random Gaussian beams are employed to model light propagation in biological tissues by Green’s functions.
Transfer Function Optimization for a Nonlinear-optical Loop Mirror (NOLM)-based Optical Reservoir
Authors: Zhang Shouqi , Song Yue , Wen Feng , Yang Feng , Wu Baojian
Published: January 2021

We investigate a nonlinear-optical loop mirror-based reservoir computing with real, imaginary and absolute-value mappings. The lowest mean-square error of 2.849×10−10 is achieved for time prediction task when the optimized coupling-ratio of 0.76.
Cavity-less Quantum Optomechanics with Nanostring Mechanical Resonators
Authors: Hao Shan , Singh Robinjeet , Zhang Jingchen , Purdy Thomas P.
Published: January 2021

We report our research effort to realize single-pass optomechanical systems with sensitivity surpassing the quantum backaction limit. We fabricate high-Q nanostring resonators with 1D phononic crystal shields to reduce mechanical dissipation.
2D disperser based FMCW lidar system design
Authors: Li Zhi , Zang Zihan , Fu H. Y.
Published: January 2021

We present a compact 2D disperser based FMCW lidar design. A design example is given with 1.51°×14.65° field of view, 6×60 resolution points and 0.44cm theoretical ranging resolution.
Fast distance measurement with a long ambiguity range using a free-running dual-comb fiber laser
Authors: Liu Ya , Zhu Zhigao , Yang Jie , Hu Guoqing
Published: January 2021

A distance measurement scheme based on a free-running dual-comb mode-locked fiber laser is demonstrated. With alternately sampling based on Vernier effect, it can realize long ambiguity range for fast real-time measurement.
Entanglement Flowing, Freezing, and Thawing in a Two-Reservoir Spin System
Authors: Qian X. -F. , Eberly J.H.
Published: January 2021

We examine entanglement dynamical flow among all participants of a two-reservoir spin system. “Freezing” and “thawing” phenomena are identified. A set of novel entanglement constraint inequalities is discovered with tetrahedron representation.
Multi-channel Source of Spectrally Factorable Photon Pairs
Authors: Ma Mingyi , Cui Liang , Li Jiamin , Su Jie , Ou Z. Y. , Li Xiaoying
Published: January 2021

Multi-channel source of spectrally factorable photon pairs are experimentally realized by using a fiber-based two-stage nonlinear interferometer scheme consisting of two pieces of dispersion-shifted fibers with a programmable optical filter.
Hybrid phononic/photonic crystal mirrors for optomechanics
Authors: Bao Yiliang , Gorman Jason , Lawall John
Published: January 2021

We demonstrate a hybrid phononic/photonic crystal mirror for optomechanics. A localized mechanical mode is created by a defect in a phononic crystal, which in turn supports a photonic crystal designed for high reflectivity.
Efficient Electro-optic Modulation on Thin Film Lithium Niobate
Authors: Jin Mingwei , Chen Jia-Yang , Sua Yong-Meng , Huang Yu-Ping
Published: January 2021

We demonstrate an electro-optic modulator on thin-film lithium niobate using a novel dual-capacitor scheme. The voltage-length product reaches 0.64 volt × cm, thus substantially reducing the driving electric power.
Infrared Optical Hybrid (IR-OH) Microscopy for Label-Free Histopathology
Authors: Schnell Martin , Mittal Shachi , Falahkheirkhah Kianoush , Mittal Anirudh , Yeh Kevin , Kenkel Seth , Kadjacsy-Balla Andre , Carney P. Scott , Bhargava Rohit
Published: January 2021

Infrared-Optical Hybrid Microscopy (IR-OH) provides mid-IR imaging on the visible microscope platform based on photothermal expansion. Spectral IR imaging of full tissue slides is demonstrated for automated disease diagnosis and computational H&E staining.
A Dual Laser Lidar System for Aerosol Studies
Authors: Sharma Nimmi Chandra Parikh , Barnes John E.
Published: January 2021

This paper describes development of an inexpensive aerosol lidar system based on dual continuous wave solid state lasers. The system employs a bistatic configuration and a CCD camera detection system for aerosol profiling.
Reconfigurable Metasurfaces for Rapid Control Over Quantum Interference Using GeTe as Phase-change Material
Authors: Estakhri Nooshin M. , Norris Theodore B.
Published: January 2021

Tunable quantum interference is enabled by a design incorporating phase-change materials into metasurfaces. Via controlled joule heating, these structures can switch rapidly between phases of constructive and destructive quantum interferences.
The Investigation of the Effect of Changing the Height of Optical Elements on the Focal Spot Size Using High-Performance Computer Systems
Authors: Savelyev Dmitry
Published: January 2021

The simulation of diffraction of Super-Gauss with radial polarization on a high-aperture diffraction axicon and the optical element matched with the circular Airy distribution was investigated. The abrupt formation of a light needle was shown.
Making Better Qubits out of Spectrally Noisy Solid State Quantum Emitters
Authors: Fotso Herbert F
Published: January 2021

We show that it is possible, by applying appropriately timed external control fields, to overcome deleterious effects of spectral fluctuations, induced by dynamic environments, in fundamental quantum information processing operations with solid state quantum emitters.
Transient Triplet Exciton Gratings in Rubrene Single Crystals
Authors: Finton Drew M. , Biaggio Ivan
Published: January 2021

We observe singlet exciton fission and the formation of triplet exciton transient gratings that allow us to study the singlet exciton fission time and the rise of the triplet population under different excitation and detection conditions
Whispering Gallery Resonators Introduced by Wet Chemical Etching at the Optical Fiber Surface
Authors: Toropov Nikita , Zaki Sajid , Vartanyan Tigran , Sumetsky Misha
Published: January 2021

We demonstrate fabrication of whispering gallery resonators by chemical etching utilizing the fiber jacket as a configurable mask. As an application, we demonstrate a miniature dispersionless delay line exhibiting 1 ns delay.
Visualization of Retinal Ischemia using Multimodal Photoacoustic Microscopy and Optical Coherence Tomography in a Rabbit Model
Authors: Nguyen Van Phuc , Li Yanxiu , Henry Jessica , Aaberg Michael , Zhang Wei , Wang Xueding , Paulus Yannis M.
Published: January 2021

This report describes a novel multimodal photoacoustic microscopy (PAM) and spectral-domain optical coherence tomography (SD-OCT) imaging setup for evaluation of the degree of retinal ischemia in living rabbits.
Reliable Oral Cancer Classification Framework with Bayesian Deep Learning
Authors: Song Bofan , Sunny Sumsum , Li Shaobai , Keerthi G , Patrick Sanjana , Mukhia Nirza , Gurudath Shubha , Raghavan Subhashini , Mendonca Pramila , Tsusennaro  , Leivon Shirley T , Kolur Trupti , Shetty Vivek , R Vidya Bushan , Ramesh Rohan , Pillai Vijay , Sigamani Alben , Suresh Amritha , Kuriakose moni Abraham , Birur Praveen , Liang Rongguang
Published: January 2021

Standard deep learning algorithms for clinical image classification are unable to understand their confidence in a decision. We developed a Bayesian deep network could estimate uncertainty to assess the reliability of oral cancer image classification.
Stimulated-Emission-Based Characterization of Optical Fiber Photon-Pair Source in Frequency and Transverse Mode
Authors: Kim D. , Hu X. , Zhang Y. , Chen X. , Garay-Palmett K. , U’Ren A. B. , Lorenz V. O.
Published: January 2021

We present preliminary results on stimulated-emission-based characterization of a birefringent optical fiber photon-pair source in frequency and transverse mode, involving direct imaging of created transverse modes.
Observation of the Parameters Describing Coupling between Waveguides and Elongated Bottle Microresonators Designed for Quantum Applications
Authors: Vitullo Dashiell L. P. , Zaki Sajid , Jones D. E. , Sumetsky M. , Brodsky Michael
Published: January 2021

We report local characterization of coupling between elongated bottle microresonators and tapered-fiber waveguides with small diameter relative to the characteristic length of resonator modes, towards quantum-compatible resonant optical microdevices.
Programming the Kennedy Receiver for Capacity Maximization versus Minimizing One-shot Error Probability
Authors: Bhadani Rahul , Grace Michael , Djordjevic Ivan B. , Sprinkle Jonathan , Guha Saikat
Published: January 2021

We find the capacity attained by the Kennedy receiver for coherent-state BPSK when the symbol prior p and pre-detection displacement β are optimized. The optimal β is different than what minimizes error probability for single-shot BPSK state discrimination.
5 mJ, 5-optical-cycles operation of a 3 µm OPCPA pumped by a 1 µm source
Authors: Alves Joana , Pires Hugo , João Celso P. , Figueira Gonçalo
Published: January 2021

We present the design of an optical parametric chirped pulse amplifier operating at 3 µm yielding 5 mJ output energy and 5-optical-cycles Fourier transform-limited duration driven by an Yb-based laser source.
Chirp Characterization of High-Frequency Free-Electron-Laser Pulses using Transient Absorption Spectroscopy
Authors: Ding Thomas , Rebholz Marc , Aufleger Lennart , Hartmann Maximilian , Stooß Veit , Magunia Alexander , Birk Paul , Borisova Gergana Dimitrova , Wachs David , Castanheira Carina da Costa , Rupprecht Patrick , Mi Yonghao , Attar Andrew R. , Gaumnitz Thomas , Loh Zhi-Heng , Roling Sebastian , Butz Marco , Zacharias Helmut , Düsterer Stefan , Treusch Rolf , Cavaletto Stefano M. , Ott Christian , Pfeifer Thomas
Published: January 2021

We present a technique for the direct measurement of the frequency chirp of high-frequency free-electron-laser pulses based on fundamental nonlinear optics. It is implemented in transient absorption geometry.
Application of cold clusters as a template for control of the columnar microstructure of thin silver films and their plasmonic properties
Authors: Katrova Vesela , Atanasova Anna , Hristova-Vasileva Temenuga , Todorov Rosen
Published: January 2021

We present the possibility of using pre-deposited cold clusters with different sizes on a glass substrate to control the columns diameter and the optical properties variation of thin silver layers obtained by glancing angle deposition.
Enhancing unconventional photon blockade using optimized time-dependent Josephson coupling
Authors: Stefanatos Dionisis , Paspalakis Emmanuel
Published: January 2021

We use numerical optimal control to find the time-dependent coupling which enhances unconventional photon blockade in a bosonic Josephson junction where the two modes are initially loaded with weakly populated coherent states.
Laser Scattering in Plateau Borders
Authors: Tufaile Adriana Pedrosa Biscaia , Tufaile Alberto
Published: January 2021

We present results of the laser scattering in some structures of foams known as Plateau borders. The light patterns are Parlaseric Circle with Laser Dogs and Horus Eye. Parlaseric Circle is due to conical diffraction.
All-optical pulse-train generation through the temporal analogue of a laser
Authors: Sparapani A. C. , Sánchez A. D. , Linale N. , Bonetti J. , Grosz D. F. , Fernández G. R.
Published: January 2021

We propose a novel scheme for the all-optical generation of trains of pulses, based on the reflection and refraction of pulses at a time boundary, and the temporal analogue of a laser cavity with gain.
Generalized model for refractive indices of III-V semiconductors
Authors: Espinosa Daniel H. G. , Odungide Mfon , Awan Kashif M. , Dolgaleva Ksenia
Published: January 2021

We derive an empirical expression, based on the Wemple-DiDomenico refractive index model, useful to calculate the refractive index of III-V semiconductors as a function of the band-gap and photon energies.