bluuebunny/crossref_metadata_2025 huggingface dataset:
Maximum likelihood-based adaptive iteration algorithm design for joint CFO and channel estimation in MIMO-OFDM systems
Authors: Cheng Nan-Hung , Huang Kai-Chieh , Chen Yung-Fang , Tseng Shu-Ming
Published: January 2021

In this paper, we present a joint time-variant carrier frequency offset (CFO) and frequency-selective channel response estimation scheme for multiple input-multiple output-orthogonal frequency-division multiplexing (MIMO-OFDM) systems for mobile users. The signal model of the MIMO-OFDM system is introduced, and the joint estimator is derived according to the maximum likelihood criterion. The proposed algorithm can be separated into three major parts. In the first part of the proposed algorithm, an initial CFO is estimated using derotation, and the result is used to apply a frequency-domain equalizer. In the second part, an iterative method is employed to locate the fine frequency peak for better CFO estimation. An adaptive process is used in the third part of the proposed algorithm to obtain the updated CFO estimation and track parameter time variations, including the time-varying CFOs and time-varying channels. The computational complexity of the proposed algorithm is considerably lower than that of the maximum likelihood-based grid search method. In a simulation, the mean squared error performance of the proposed algorithm was close to the Cramer-Rao lower bound. The simulation results indicate that the proposed novel joint estimation algorithm provides a bit error rate performance close to that in the perfect channel estimation condition. The results also suggest that the proposed method has reliable tracking performance in Jakes’ channel models.
A case of idiopathic myointimal hyperplasia of the mesenteric veins presenting with small bowel obstruction
Authors: Yamada Kohei , Hiraki Masatsugu , Tanaka Toshiya , Mori Daisuke , Tanaka Futoshi , Manabe Tatsuya , Aibe Hitoshi , Kitahara Kenji , Noshiro Hirokazu
Published: January 2021

Background

Idiopathic myointimal hyperplasia of the mesenteric veins (IMHMV) is a rare ischemic bowel disease with venous occlusion resulting from the proliferation of smooth muscles in the venous intima. In most patients, the disease affects rectosigmoid colon and causes persistent abdominal pain and hematochezia, which is similar to inflammatory bowel disease (IBD). In addition, it is difficult to make a precise diagnosis of IMHMV without surgery.

Case presentation

An 81-year-old woman was admitted to our hospital with mild abdominal pain, nausea and vomiting. Repeated adhesive ileus was suspected due to the previous open and laparoscopic surgeries. Surgery was planned to treat small bowel obstruction. Intraoperatively no adhesive lesions were observed. However, a mass lesion was seen at the terminal ileum, which was suspected to have caused her bowel obstruction. Partial resection of the small intestine was performed. Macroscopic and histopathological examinations of the excised specimen showed circumferential ulceration with scarring, a thickened venous wall with active inflammation, and fibrotic changes that consequently produced stenosis and obstruction of the venous lumen in the subserosa. Additionally, Elastica van Gieson staining demonstrated thickening of the venous intima. The final diagnosis was IMHMV. At two years and 8 months after the operation, the patient was well without any additional medication.

Conclusion

IMHMV of the small intestine is rare. We described a case of IMHMV that was associated with ileus.
Antagonistic activity of endophytic bacteria isolated from weed plant against stem end rot pathogen of pitaya in Vietnam
Authors: Luu The Anh , Phi Quyet Tien , Nguyen Thi Thu Hang , Dinh Mai Van , Pham Bich Ngoc , Do Quang Trung
Published: January 2021

Background

Fungal stem end rot disease of pitaya caused by Alternaria alternata is one of the most destructive diseases in Binh Thuan province, Vietnam. This study aimed to assess the antagonistic effects of some endophytic bacteria isolated from the weed plant (Echinochloa colonum) against A. alternata.

Results

A total of 19 endophytic bacteria were isolated and 5 of them presented in vitro antagonistic activity against A. alternata. Of five, strain EC80 significantly inhibited the pathogenic growth with a mean inhibition diameter of 11.88 ± 0.08 mm, while the other four (C79, EC83, EC90, and EC97) showed a weak inhibition. Interestingly, the combination of EC79 and EC80 reduced more biomass of pathogenic fungi than the single one did. EC79 showed positive results for amylase, indole acetic acid (IAA), and biofilm production, whereas EC80 presented positive capabilities for IAA and biofilm production and a negative one for amylase production. In addition, the combined filtrate of EC79 and EC80 presented non-antifungal activity on biocontrol tests in vitro, indicating that bacteria cells played a role in defending against the pathogen. Moreover, both isolates EC79 and EC80 significantly increased seedling biomass than the control.

Conclusions

The results suggest that those two strains in combination had the potential to be used as a biocontrol agent against A. alternata. More studies should be done in the future to evaluate their efficiency under the field conditions.
Articular and periarticular spinal calcifications in relation to synovial fluid findings in patients with calcium pyrophosphate dihydrate deposition disease (CPPD)
Authors: Abdelkareem Mohamed Ismail , Ellabban Abdou Saad Taha , Ismail Ahmed Hamed , Rayan Mohamed Moneer , Abdel-Magied Rasha Ali
Published: January 2021

Background

Calcium pyrophosphate dihydrate deposition disease (CPPD) is the second most common form of the crystal-associated arthritis. Diagnosis is achieved by detection of crystals by polarized light microscopy and/or detection of hyaline cartilage or fibrocartilage calcifications characteristic of CPPD deposition by musculoskeletal ultrasound (MSUS). Axial involvement with intervertebral disc calcification, sacroiliac erosions, and sub-chondral cysts of the facet joints occurs with CPPD deposition.

Aim

To assess the presence and relation between calcification of intervertebral discs, other articular and periarticular spinal structures, and synovial fluid analysis (SFA) and MSUS calcifications in patients with CPPD deposition disease.

Methods

One hundred patients with CPPD disease diagnosed according to the modified proposed diagnostic criteria by McCarty 1994 were included. Plain radiography on the spines, pelvis, and affected joints, MSUS on affected joints, and synovial fluid analysis (SFA) were done.

Results

Spinal calcification was present in 55% of patients. The commonest site was anterior longitudinal ligament (43%). Characteristic CPPD calcifications by plain radiography on the knee and wrist joints were present in 38% and 16% respectively. Characteristic CPPD calcifications by MSUS on the knee and wrist joints presented in 93% and 27% respectively. CPPD crystal detection by SFA was 97%. The accuracy of MSUS to diagnose CPPD deposition disease is more than double that of plain radiography, and it is comparable to that of synovial fluid analysis. The result of intra-rater analysis between SFA by polarized light microscopy and MSUS was kappa 0.767 (p < 0.001); this indicates substantial level of agreement between SFA and MSUS; between plain radiography and MSUS, it was kappa 0.188 (p = 0.32) which indicates slight agreement, and between plain radiography and SFA, it was kappa 0.037 (p = 0.1) which fails to reach a significant level of agreement. There was a significant positive relation between spinal calcification and wrist joint calcification by plain radiography.

Conclusion

Considerable spinal affection by CPPD deposition disease can be detected. Although the most definitive, reliable direct approach for CPPD deposition disease diagnosis is SFA using polarized light microscopy, MSUS is considered a useful non-invasive diagnostic tool in this situation. In CPPD deposition disease, MSUS has proven to be an excellent technique for detecting calcification in the articular tissue disease compared to conventional radiography.
Implications of the COVID-19 pandemic for patients with schizophrenia spectrum disorders: narrative review
Authors: Zhand Naista , Joober Ridha
Published: January 2021

Background

COVID-19 was declared a pandemic in March 2020, by the World Health Organization. The pandemic has had unprecedented worldwide implications, in particular on marginalized populations.

Aims

The aim of this study is to review the impact of the pandemic on patients with schizophrenia spectrum disorders.

Method

A number of databases were searched for this review, including PubMed, EMBASE, PsycINFO and Google Scholar. Search terms included psychosis and COVID-19, schizophrenia and COVID-19, and severe mental illness and COVID-19. We included all English language papers and preprints. The final search was done on 15 July 2020.

Results

Forty-seven relevant studies were identified and included in this review. Studies were summarised into five main subcategories: potential impact of the COVID-19 pandemic on physical health outcomes of patients with schizophrenia spectrum disorders, impact on mental health outcomes, review of case reports and case series to date, treatment recommendation guidelines and risk of increased prevalence of psychosis.

Conclusions

Patients with schizophrenia spectrum disorders may be vulnerable to the effects of the COVID-19 pandemic. This patient population has a number of risk factors, including psychosocial adversities and illness related factors. Continuous monitoring and long-term studies of the impact of the pandemic on this patient population are required.
Development and Validation of a Prediction Model of Overall Survival in High-Risk Neuroblastoma Using Mechanistic Modeling of Metastasis
Authors: Benzekry Sébastien , Sentis Coline , Coze Carole , Tessonnier Laëtitia , André Nicolas
Published: January 2021

Prognosis of high-risk neuroblastoma (HRNB) remains poor despite multimodal therapies. Better prediction of survival could help to refine patient stratification and better tailor treatments. We established a mechanistic model of metastasis in HRNB relying on two processes: growth and dissemination relying on two patient-specific parameters: the dissemination rate μ and the minimal visible lesion size Svis. This model was calibrated using diagnosis values of primary tumor size, lactate dehydrogenase circulating levels, and the meta-iodobenzylguanidine International Society for Paediatric Oncology European (SIOPEN) score from nuclear imaging, using data from 49 metastatic patients. It was able to describe the data of total tumor mass (lactate dehydrogenase, R2 > 0.99) and number of visible metastases (SIOPEN, R2 = 0.96). A prediction model of overall survival (OS) was then developed using Cox regression. Clinical variables alone were not able to generate a model with sufficient OS prognosis ability ( P = .507). The parameter μ was found to be independent of the clinical variables and positively associated with OS ( P = .0739 in multivariable analysis). Critically, addition of this computational biomarker significantly improved prediction of OS with a concordance index increasing from 0.675 (95% CI, 0.663 to 0.688) to 0.733 (95% CI, 0.722 to 0.744, P < .0001), resulting in significant OS prognosis ability ( P = .0422).
Duration of Adjuvant Doublet Chemotherapy (3 or 6 months) in Patients With High-Risk Stage II Colorectal Cancer
Authors: Iveson Timothy J. , Sobrero Alberto F. , Yoshino Takayuki , Souglakos Ioannis , Ou Fang-Shu , Meyers Jeffrey P. , Shi Qian , Grothey Axel , Saunders Mark P. , Labianca Roberto , Yamanaka Takeharu , Boukovinas Ioannis , Hollander Niels H. , Galli Fabio , Yamazaki Kentaro , Georgoulias Vassilis , Kerr Rachel , Oki Eiji , Lonardi Sara , Harkin Andrea , Rosati Gerardo , Paul James
Published: January 2021

PURPOSE:

As oxaliplatin results in cumulative neurotoxicity, reducing treatment duration without loss of efficacy would benefit patients and healthcare providers.

PATIENTS AND METHODS:

Four of the six studies in the International Duration Evaluation of Adjuvant Chemotherapy (IDEA) collaboration included patients with high-risk stage II colon and rectal cancers. Patients were treated (clinician and/or patient choice) with either fluorouracil, leucovorin, and oxaliplatin (FOLFOX) or capecitabine and oxaliplatin (CAPOX) and randomly assigned to receive 3- or 6-month treatment. The primary end point is disease-free survival (DFS), and noninferiority of 3-month treatment was defined as a hazard ratio (HR) of < 1.2- v 6-month arm. To detect this with 80% power at a one-sided type one error rate of 0.10, a total of 542 DFS events were required.

RESULTS:

3,273 eligible patients were randomly assigned to either 3- or 6-month treatment with 62% receiving CAPOX and 38% FOLFOX. There were 553 DFS events. Five-year DFS was 80.7% and 83.9% for 3-month and 6-month treatment, respectively (HR, 1.17; 80% CI, 1.05 to 1.31; P [for noninferiority] .39). This crossed the noninferiority limit of 1.2. As in the IDEA stage III analysis, the duration effect appeared dependent on the chemotherapy regimen although a test of interaction was negative. HR for CAPOX was 1.02 (80% CI, 0.88 to 1.17), and HR for FOLFOX was 1.41 (80% CI, 1.18 to 1.68).

CONCLUSION:

Although noninferiority has not been demonstrated in the overall population, the convenience, reduced toxicity, and cost of 3-month adjuvant CAPOX suggest it as a potential option for high-risk stage II colon cancer if oxaliplatin-based chemotherapy is suitable. The relative contribution of the factors used to define high-risk stage II disease needs better understanding.
Comparison of Tooth Widths, Arch Widths and Arch Lengths in Class-I Normal Dentition to Class-I and II Crowded Dentitions
Authors: Shafique Hafiza Zobia , Zaheer Rumeesha , Jan Abdullah , Fazal Ayesha
Published: January 2021

Background and Objective: Dental study casts play a vital role in the diagnosis and treatment planning of various orthodontic cases. This study was carried out to compare the tooth widths, arch widths, and arch lengths in Class-I normal dentition to those in Class-I and Class-II crowded dentition in an effort to improve treatment planning and to eventually reduce treatment duration.

Methods: Total 170 patients, 12 to 40 years of age with a complete set of permanent teeth till 1st molars; who presented to the Orthodontics Department at Armed Forces Institute of Dentistry (A.F.I.D), Rawalpindi from Sep 2019 to Feb 2020, were included in the study. Non-probability purposive method of sampling was used. The dental casts obtained were used to measure tooth widths, arch widths, and arch lengths. Subjects were classified into Class-I normal and Class-I and Class-II crowded occlusion and comparison of the sum of tooth widths, arch widths, and arch length discrepancies were determined among the three occlusion groups. Data was analyzed in SPSS version 21 and independent samples t-test was used to differentiate the variables of interest.

Results: Out of 170 subjects, 73 (42.9%) subjects had Class-I normal occlusion while 97 (57%) had Class-I and Class-II crowded occlusions. No statistical difference was found between the occlusal groups with regard to the sum of tooth widths, inter-canine widths, inter-first premolar widths, inter-second premolar widths and inter-molar widths. However, a remarkable difference was observed between the occlusal groups with respect to arch perimeters and arch length discrepancies (p = 0.000 and 0.000 respectively).

Conclusions: Results of the current study indicate that crowding of teeth occurs as a consequence of decreased arch perimeters which may lead to increased arch length discrepancies. However, no prominent difference was noticed in the sum of tooth widths and arch widths among different occlusal groups.

doi: https://doi.org/10.12669/pjms.37.2.3240

How to cite this:Shafique HZ, Zaheer R, Jan A, Fazal A. Comparison of Tooth Widths, Arch Widths and Arch Lengths in Class-I Normal Dentition to Class-I and II Crowded Dentitions. Pak J Med Sci. 2021;37(2):345-350. doi: https://doi.org/10.12669/pjms.37.2.3240

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Gamifica tu ANL.
Authors: Martín Cardoso Jesús
Published: January 2021

Ídolos de Acero es un proyecto de gamificación dirigido alumnos de 2º de ESO que cursan la asignatura Historia y Geografía en Alemán. Además de la presentación de este proyecto se analizan las mecánicas claves para introducir esta gamificación en cualquier ámbito y asignatura.
La Guerra de Ifni, ecos amordazados y huellas disipadas por la prensa del franquismo.
Authors: Yanguas Muñoz Mónica
Published: January 2021

This research focuses on the analysis of Spanish press which chronologically concurs with the Ifni War, studied contrasting the events and testimonies of those who experienced this war and those who entail a professional relationship with it (a journalist specifically). It was a conflict in the framework of the Francoist dictatorship and the process of decolonisation and expansion of Morocco in the mid-twentieth century. The general aim that we consider is to verify the interference of the media during the war, specifically press, and simultaneously contribute to unearth Ifni from the abyss of oblivion. This article brings to light the history of Ifni in relation to Spain, the Francoist mechanisms of informative control and some of the current outcomes of the war.
Capturing Value in Platform Business Models That Rely on User-Generated Content
Authors: Subramanian Hemang , Mitra Sabyasachi , Ransbotham Sam
Published: January 2021

Business models increasingly depend on inputs from outside traditional organizational boundaries. For example, platforms that generate revenue from advertising, subscription, or referral fees often rely on user-generated content (UGC). But there is considerable uncertainty on how UGC creates value—and who benefits from it—because voluntary user contributions cannot be mandated or contracted or its quality assured through service-level agreements. In fact, high valuations of these platform firms have generated significant interest, debate, and even euphoria among investors and entrepreneurs. Network effects underlie these high valuations; the value of participation for an individual user increases exponentially as more users actively participate. Thus, many platform strategies initially focus on generating usage with the expectation of profits later. This premise is fraught with uncertainty because high current usage may not translate into future profits when switching costs are low. We argue that the type of user-generated content affects switching costs for the user and, thus, affects the value a platform can capture. Using data about the valuation, traffic, and other parameters from several sources, empirical results indicate greater value uncertainty in platforms with user-generated content than in platforms based on firm-generated content. Platform firms are unable to capture the entire value from network effects, but firms with interaction content can better capture value from network effects through higher switching costs than firms with user-contributed content. Thus, we clarify how switching costs enable value for the platform from network effects and UGC in the absence of formal contracts.
Silver-containing polysaccharide-based tricomponent antibacterial fibres for wound care applications
Authors: Masood Rashid , Khubaib M. Anam , Hussain Tanveer , Raza Zulfiqar Ali
Published: January 2021

Objective:

Polysaccharide-based biomaterials are extensively used in wound care healing due to their unique liquid absorption, gelling properties and biocompatibility properties. They play an important role in controlling infections of highly exuding hard-to-heal wounds. The main objective of this study was to develop silver-containing polysaccharide-based tricomponent antibacterial fibres for use in these complex wounds.

Method:

The fibres were developed by coating silver-containing alginate and psyllium fibres with hydrolysed chitosan. Dope solution containing alginate, psyllium and silver carbonate was extruded into a coagulation bath containing calcium chloride and hydrolysed chitosan. The developed fibres were tested for liquid absorption, swelling and antibacterial properties against a control fibre (of alginate and psyllium).

Results:

The developed fibres showed comparatively better liquid absorption, gelling and antibacterial properties than the control fibres.

Conclusion:

The study concluded that developed fibres could be a preferred choice for application on hard-to-heal wounds with high levels of exudate, to support infection control and faster healing.
Exploring the clinical debrief: benefits and barriers
Authors: Snowdon Kate
Published: January 2021

Paramedics are regularly exposed to traumatic situations in the prehospital environment, which can profoundly affect their emotional resilience. A debrief is a recognised tool that is used to manage the aftermath of such events. Its aims are to unpick the components of the situation, identify any issues or achievements in clinical care, highlight learning points to improve future practice and safeguard the clinician’s emotional wellbeing. This article explores the benefits of and barriers to debriefing in clinical practice as well as the emerging debate around the potential harm or benefit of single-session debriefing.
Supplemental data for "Review of filter strip performance and function for improving water quality from agricultural lands"
Authors: Douglas-Mankin Kyle R
Published: January 2021

This Dataset was compiled from cited literature in support of the review article "Douglas-Mankin KR, Helmers MJ, Harmel RD. 2021. Review of filter strip performance and function for improving water quality from agricultural lands. Trans. ASABE, 64(2). https://doi.org/10.13031/trans.14169", which summarizes, analyzes, and interprets data from 74 published studies to assess filter strip effectiveness in reducing sediment, nutrients, pesticides, and pathogens from agricultural lands. Journal article will be online April 2021.
State Crime, Native Americans and COVID-19
Authors: Finley Laura
Published: January 2021

This paper examines how COVID-19 has disproportionately affected Native Americans. It frames the problem as one of existing structural disadvantage that is the result of settler colonialism, showing a history of abuse and neglect in earlier pandemics. The US has an obligation to Native peoples that it is failing to uphold in numerous ways, including needed health care and resources to battle the virus. The paper describes how this is state crime in the form of slow violence.
Tecnopopulismo o la lógica política del aceleracionismo de ‹‹izquierdas››: entre autonomía y equivalencia
Authors: Hermoso de Mendoza Pi Víctor
Published: January 2021

Este artículo se propone abordar el aceleracionismo de Alex Williams y Nick Srnicek centrándose en su práctica emancipadora de producción de sujetos políticos. Si bien ha sido considerado como una ‹‹herejía marxista››, lo cierto es que recoge la herencia del postobrerismo italiano, pero declinado en la lógica hegemónica del posmarxismo de Ernesto Laclau y Chantal Mouffe. Sin embargo, postobrerismo y posmarxismo comparten ciertos distanciamientos del marxismo ‹‹ortodoxo›› en la formación de subjetividades políticas, pero una lógica emancipadora en conflicto. Así, el aceleracionismo de Srnicek y Williams se encuadra en esta disputa entre la experiencia autónoma de la ‹‹multitud›› y la articulación equivalencial del ‹‹pueblo››, y nuestro objetivo será problematizar esta hibridación en vías de reconceptualizar este aceleracionismo como un tecnopopulismo.
El debilitamiento del yo en el tardocapitalismo y la nueva propaganda fascista
Authors: Magnet Colomer Jordi
Published: January 2021

El fermento psicológico del fascismo en las sociedades capitalistas tardías aparece vinculado al proceso de debilitamiento del yo y al necesario entrelazamiento de las disposiciones subjetivas con factores situacionales. Desentrañar los mecanismos que inciden en la expansión del carácter potencialmente fascista requiere de un análisis de las tendencias de la personalidad que favorecen su arraigo y cómo se ven fomentadas por determinados procesos sociales. El presente artículo se centra en el influjo y la interacción de tres factores objetivos y tres factores subjetivos. Para ello nos apoyamos principalmente en los estudios sobre la propaganda fascista y la cultura de masas llevados a cabo por los autores de la primera Teoría Crítica.
Implementación de la Educación Afectiva y Sexual. Un estudio
exploratorio en tres escuelas secundarias públicas de
Barcelona
Authors: Lapadula Maria Carmelita
Published: January 2021

INTRODUCCIÓN. El modelo de sexualidad integral, que abarca
aspectos biológicos, sociales, psicológicos y culturales, define un
modelo de educación sexual que propone una formación graduada, a lo
largo de toda la vida, abordada desde diferentes servicios. La
escuela, caracterizada por ser uno de los espacios primarios de
socialización, es clave para el desarrollo de capacidades
relacionadas con la sexualidad y la afectividad. MÉTODO. Se propuso
un estudio exploratorio que permitiera analizar cómo es percibida la
implementación la educación sexual en tres escuelas públicas de la
ciudad de Barcelona. Para llevar a cabo la recogida de datos se
realizaron entrevistas a estudiantes y docentes de 3.º y 4.º curso
de Educación Secundaria Obligatoria de los tres centros estudiados.
RESULTADOS. Los resultados se recogieron en cuatro bloques, según la
información obtenida: a) conceptualización de la Educación Sexual y
Afectiva, b) acciones en la escuela, c) necesidades de los
estudiantes y d) propuestas de mejora. DISCUSIÓN. Finalmente se
contrastaron los resultados obtenidos con estudios que trabajan
sobre la necesidad de una educación sexual integral y transversal
que garantice el ejercicio de la juventud.
Resolution Enhancement in Ghost Imaging by Random Mask Filtering
Authors: Chang Chen , Yang Dongyue , Wu Guohua , Luo Bin , Yin Longfei
Published: January 2021

Improving the image resolution is one of the most important issues in ghost imaging. By adding a randomly occurred mask to filter the outputs of both reference and signal detection, the resolution can be improved.
Detecting Diabetes-Induced Abnormal Chirality in Urine via Accumulation-Assisted Plasmonic Chiral Sensing
Authors: Liu Yaoran , Wu Zilong , Zheng Yuebing
Published: January 2021

We demonstrate the label-free chiral detection of metabolic molecules in urine via accumulation-assisted plasmonic chiral sensing, which will benefit the development of point-of-care devices for first-line noninvasive screening of diabetes.
Phase-Sensitive Plasmonic Biosensing through Interferometric Detection
Authors: Tsai Ding-Zhang , You Che-Hao , Hsu Shih-Hsiang
Published: January 2021

The stabilized phase from polarization maintaining fibers constructs spectral interferometry based surface plasmon resonance on the microRNA. The sensitivity with probing is showing 0.14 rad/(µg/mL), which resolution is 20 times better than the wavelength modulation.
Complementary characteristics of Digital Holography and White Light Interferometry allow quantitative study of thin liquid film
Authors: Wang Zhe , Ferraro Vincenzo , Miccio Lisa , Maffettone Pier Luca
Published: January 2021

We present a fusion approach for mapping the thin-film thickness, it combines digital holography and white light interferometry. This method could perform a high spatial and temporal resolution thickness measurement on film time evolution.
Fiber-Optic Static-Strain Sensing with Single & Dual Fiber Fabry-Perot Interferometers
Authors: Hoque Nabil Md Rakinul , Duan Lingze
Published: January 2021

We demonstrate the effectiveness of a dual-fiber-Fabry-Perot-interferometer (FFPI) strain sensor over the conventional single-FFPI scheme by achieving better strain resolution in the low-frequency regime.
Broadband Second Harmonic Generation in Metamaterial with Magnetoelectric Coupling
Authors: Wang Chen , Wen Yongzheng , Sun Jingbo , Zhou Ji
Published: January 2021

Based on magnetoelectric coupling in metamaterial, we present a broadband second harmonic generation (SHG). By combining different meta-molecules together, SHG with 2.7 μm bandwidth can be achieve in mid-infrared regime.
Optimal Materials for Maximum Near-field Radiative Heat Transfer
Authors: Zhang Lang , Miller Owen D.
Published: January 2021

We identify optimal material properties for near-field radiative heat transfer. We find that no typically proposed materials satisfy all criteria, but that certain bulk and 2D plasmonic materials offer 5-10X improvements beyond the state-of-the-art.
Physics-Embedded Deep Learning for Intensity Diffraction Tomography
Authors: Matlock Alex , Tian Lei
Published: January 2021

We present a physics-embedded deep learning framework enabling 3D refractive index recovery of strongly scattering objects using intensity diffraction tomography. We present the improvements of our Y-Net framework on simulated and experimental data.
Improved measurement of surface plasmon scattering based on deep learning
Authors: Moon Gwiyeong , Son Taehwang , Lee Hongki , Kim Donghyun
Published: January 2021

We investigate use of deep learning to improve measurement of surface plasmon scattering images. It was shown that deep learning may enhance the detection accuracy significantly and can be particularly efficient in the noisy environment.
Evolution of femtosecond laser-induced modification in nanoporous glass
Authors: Fedotov S. S. , Lipatiev A. S. , Presniakov M. Yu. , Shakhgildyan G. Yu. , Okhrimchuk A. G. , Lotarev S. V. , Sigaev V. N.
Published: January 2021

Formation of birefringent cavities inside nanoporous glass was investigated. The shape of the void cross-section varied from circle to ellipse when increasing number of pulses while major ellipse axis always perpendicular to the laser polarization.
Optically tunable photonic band gap with polariton condensates
Authors: Askitopoulos A. , Alyatkin S. , Sitnik K. , Lagoudakis P. G.
Published: January 2021

Implementing a 1D periodic-lattice of polariton condensates, we shape the potential landscape in a planar microcavity leading to the formation of photonic bands and the appearance of an energy gap, tunable by the condensate density.
Zero-energy tuning of silicon photonic devices using 3D-printed microfluidics
Authors: Larson Kevin , Hammond Alec , Carver Christian , Anderson Derek , Boaks Mawla , Viglione Matthew , Nordin Greg , Camacho Ryan M.
Published: January 2021

Resonant frequencies of silicon ring resonators are tuned using a custom Laser 3D-printed microfluidic chip overlaid directly on the photonic circuit. A shift of a full FSR is observed at a concentration of 10% NaCl.
Characterizing Wavefront Properties of Focusing Ultrashort Laser Pulses by a Single Data Frame
Authors: Guang Zhe , Zhu Ping , Trebino Rick
Published: January 2021

We present a wavefront property analysis on focusing ultrashort laser pulses, measured by our single-frame multi-wavelength digital holography method STRIPED FISH. Spatial, spectral, and temporal diagnosis are run to assess the pulse quality.
Potential Applications of Metamaterials to Computational Imaging
Authors: Mait Joseph N. , Athale Ravindra A. , van der Gracht Joseph , Euliss Gary W.
Published: January 2021

The potential exists for new optical technologies to impact computational sensor design. We consider in a formal manner the potential impact of metamaterials.
1-μm distributed feedback laser with low divergence angle
Authors: Ye Shengwei , Hou Lianping , Liang Song , Marsh John H.
Published: January 2021

A DFB laser operating at wavelength of 1 μm has been demonstrated with a small divergence angle (17.8° × 25.5°), low threshold current of 16 mA and output power of 37 mW at 90 mA.
Finding Broken Gates in Quantum Circuits–Exploiting Hybrid Machine Learning
Authors: LaBorde Margarite L. , Rogers Allee C. , Dowling Jonathan P.
Published: January 2021

We demonstrate a procedure to diagnose where gate faults occur in a circuit by using a hybridized quantum-and-classical machine-learning technique, using a diagnostic circuit and selected inputs. We numerically demonstrate an accuracy of over 90%.
Propagation of EM-Coherence Through Varying Lens Position Fractional Fourier Transform System
Authors: Yelashetty Arvind , Gupta Nitika , Dhirhe Devnath , Unnikrishnan Gopinathan
Published: January 2021

The partially coherent beam is employed to verify EM-coherence properties in Fractional Fourier Transform system comprising of position varying lens. The Full Width at Half Maximum of Gaussian shape of Degree Of Coherence is also determined.
On-chip Octave-spanning Supercontinuum Generation in Slot Waveguide by Dual Pump with Low Power
Authors: Zhou Kangzhu , Kang Zhe , Li Qian , Wai P. K. A.
Published: January 2021

We propose an integrated structure with microresonator and slot waveguide to generate high performance supercontinuum harnessing dual-pump scenario. Compared with single pump of CW or soliton pulse, it possesses broader spanning and better coherence.
Listening to the Sound of Light to Guide Surgeries
Authors: Bell Muyinatu A. Lediju
Published: January 2021

This invited contribution describes multiple opportunities for photoacoustic imaging to benefit surgical guidance.
Three-Dimensional Visualization of Choroidal Vascular Lesions using Multimodal Photoacoustic Microscopy and Optical Coherence Tomography in Living Rabbits
Authors: Nguyen Van Phuc , Li Yanxiu , Henry Jessica , Aaberg Michael , Zhang Wei , Wang Xueding , Paulus Yannis M.
Published: January 2021

The current study is presenting a non-invasive and high resolution multimodal photoacoustic microscopy (PAM) and optical coherence tomography (OCT) system for visualization of choroidal vascular lesions in living rabbits.
Computational Mesoscope for Single-Shot 3D Fluorescence Imaging
Authors: Xue Yujia , Davison Ian G. , Boas David A. , Tian Lei
Published: January 2021

We report a Computational Miniature Mesoscope for single-shot 3D fluorescence imaging across a wide field-of-view and extended depth-of-field.
Optical phase of arbitrary non-orthogonal Jones matrices
Authors: Gutiérrez-Vega Julio C.
Published: January 2021

The optical phase (dynamic and geometric) introduced by an optical system described by a Jones matrix with non-orthogonal eigenvectors is analytically determined. We characterize the conditions to get ortho-transmission states.
Demonstration of a Veiled Space-Time Talbot Effect
Authors: Yessenov Murat , Hall Layton A. , Ponomarenko Sergey A. , Abouraddy Ayman F.
Published: January 2021

We investigate experimentally the self-imaging of a pulsed optical field with a periodic transverse spatial profile that incorporates spatio-temporal spectral correlations. We observe a novel ‘veiled’ space-time Talbot effect in which ‘time-diffraction’ is realized.
Microresonator Logic Gates with Counterpropagating Light
Authors: Moroney Niall , Del Bino Leonardo , Woodley Michael T. M. , Silver Jonathan , Ghalanos George N. , Svela Andreas , Zhang Shuangyou , Del’Haye Pascal
Published: January 2021

We use kerr-interaction between counter-propagating light waves in a whispering gallery mode resonator to demonstrate a universal, all-optical, logic gate. This provides a novel path for on-chip routing of light.
In vivo human retina and cornea imaging with spatiotemporal optical coherence (STOC) manipulation and digital aberration correction
Authors: Borycki Dawid , Auksorius Egidijus , Węgrzyn Piotr , Wojtkowski Maciej
Published: January 2021

We apply spatiotemporal optical coherence (STOC) manipulation with digital aberration correction to achieve aberration-free, crosstalk-free, high-speed, high-resolution Fourier-domain full-field optical coherence tomography (FD-FF-OCT). We demonstrate the results of human in vivo retinal and corneal imaging.
Scanless and Detectorless Imaging by Optical Feedback Interferometry: a Proof of Principle
Authors: Lupo Alessandro , Labini Paolo Sylos , Dabbicco Maurizio
Published: January 2021

Laser multi-wavelength detectorless reflection imaging based on absorption contrast is demonstrated by optical feedback interferometry, together with a novel scanless modality based on compressive sensing and structured illumination.
Measuring Intrinsic and Extrinsic Sources of Spectral Contrast with Optical Coherence Tomography at 840 nm
Authors: Merkle Conrad W. , Augustin Marco , Harper Danielle J. , Baumann Bernhard
Published: January 2021

Here we examine sources of spectroscopic contrast, both intrinsic and extrinsic, that can be measured in retinal tissue using optical coherence tomography in a mouse model in vivo with an 840 nm light source.
Towards low-loss monolithic silicon and nitride photonic building blocks in state-of-the-art 300mm CMOS foundry
Authors: Bian Yusheng , Ayala Javier , Meagher Colleen , Peng Bo , Rakowski Michal , Jacob Ajey , Nummy Karen , Stricker Andy , Sowinski Zoey , Sahin Asli , Aboketaf Abdelsalam , Hu Shuren , Stobert Ian , Mclean Kate , Medina Louis , Dezfulian Kevin , Harris Brendan , Krishnamurthy Subramanian , Houghton Thomas , Lee Won Suk , Sorbara Massimo , Riggs Dave , Letavic Ted , Yu Anthony , Giewont Ken , Pellerin John
Published: January 2021

We review recent progress in loss reduction of Si and SiN waveguides in GLOBALFOUNDRIES 300mm monolithic Si photonics platform. Primary challenges to creating low-loss CMOS integrated photonic components are highlighted and potential solutions are outlined.
Micro-transfer-printed III-V-on-Silicon DBR lasers
Authors: Haq Bahawal , Kumari Sulakshna , Zhang Jing , Gocalinska Agnieszka , Pelucchi Emanuele , Corbett Brian , Roelkens Gunther
Published: January 2021

III-V-on-silicon DBR lasers are realized by micro-transfer-printing prefabricated III-V semiconductor optical amplifiers on a silicon waveguide circuit and the effect of misalignment, inherent to the process, on the threshold current is investigated.
Scaling the Retinal Image of the Pseudophakic Eye Using the Nodal Point
Authors: Simpson Michael J.
Published: January 2021

Peripheral dark shadows seen by some intraocular lens patients have led to evaluations of “far peripheral vision”. Angular scaling to the second nodal point has been found to be highly linear for the chief ray.
Metasurfaces characterization by Quantitative Phase Imaging with SID4 wavefront sensor
Authors: Genuer Valentin , Laberdesque Romain , Wattellier Benoit
Published: January 2021

Quantitative phase imaging (QPI) solutions are developed to characterize metasurfaces in single-shot. SID4 wavefront sensor based on Quadriwave Lateral Shearing Interferometry (QWLSI), is used to provide the quantitative phase information such as wavefront, PSF, MTF.
Guidestar-free wavefront shaping
Authors: Yeminy Tomer , Katz Ori
Published: January 2021

We present a new concept, image-guided wavefront-shaping, for non-invasive, widefield, incoherent imaging through highly scattering layers, without illumination control. We use image quality assessment as a feedback for wavefront correction.
Addressing Wavenumber Error in Interference Pattern Structured Illumination Imaging
Authors: Whetten Benjamin , Day Carter F. , Durfee Dallin S. , Sandberg Richard L.
Published: January 2021

Motor inaccuracies in Interference Pattern Structured Illumination Imaging cause phase errors that effect image quality. We demonstrate that phase retrieval algorithms correct the phase errors and improve the resultant IPSII images.
Precise Mid-Infrared Dual-Comb Spectroscopy of Ethylene
Authors: Wang Zhenhai , Chen Zaijun , Chao Xing , Vicentini Edoardo , Hänsch Theodor W. , Picqué Nathalie
Published: January 2021

Dual-comb spectroscopy of Doppler-broadened rovibrational transitions of ethylene is performed in the 3-µm region with resolved comb lines and self-referencing of the fiber combs, leading to line-position measurements with an average uncertainty of 2.3 MHz.
Atomic-Scale Photonic Memristive and Nano-Opto-Electro-Mechanical Devices Enabled by Plasmonics
Authors: Leuthold Juerg , Cheng Bojun , Lewerenz Mila , Passerini Elias , Fedoryshyn Yuriy , Koch Ueli , Emboras Alexandros , Haffner Christian , Luisier Mathieu , Schimmel Thomas
Published: January 2021

Plasmonics allows for an unprecedented miniaturization of optical elements. For instance, by combining plasmonics with memristive approaches atomic scale switches and photodetectors can be obtained, whereas combining plasmonics with MEMS allows realization of nano-opto-electro-mechanical switches.
InGaN-diode-pumped AlGaInP VECSEL with sub-kHz linewidth at 689 nm
Authors: Moriya Paulo Hisao , Casula Riccardo , Parrotta Daniele C. , Chappell George A. , Ranta Sanna , Kahle Hermann , Guina Mircea , Hastie Jennifer E.
Published: January 2021

We report low noise, sub-kHz linewidth operation of a compact AlGaInP-based vertical-external-cavity surface-emitting laser (VECSEL), designed for InGaN-diode-pumping at 44X nm. We achieve 150 mW at 689 nm, suitable for cooling neutral Strontium optical clocks.
Aerosol Mitigation via Optically-Induced Acoustic Waves
Authors: Goffin A. , Griff-McMahon J. , Larkin I. , Milchberg H.M.
Published: January 2021

Through scattering and absorption, aerosols can interfere with long-distance laser propagation through the atmosphere. Here we directly measure the dynamics of aerosol particles acoustically cleared by an optical pulse.
Optical Traps and Colloidal Phase Transitions for Ultra-Broadband Optical Limiting
Authors: Biaggio Ivan , Ou-Yang H. Daniel
Published: January 2021

Focused electro-magnetic radiation concentrates nanoparticles relying only on the magnitude of the optical electric field and ignoring its frequency. This enables broadband optical limiting in the infrared when coupled with a colloidal phase transition.
A young eye model to investigate the influence of a gradient-index lens on peripheral refractive errors
Authors: Coughlan Mark F. , Sheil Conor J. , Goncharov Alexander V.
Published: January 2021

We compare the peripheral refractive errors of two young eye models containing a constant refractive index lens and a more anatomically correct GRIN lens, respectively. We find the GRIN lens causes a peripheral myopic shift.
Fluorescence Quantum Beats due to Long-Lived Entangled Triplet Excitons in Rubrene Crystals
Authors: Wolf Eric A. , Finton Drew M. , Biaggio Ivan
Published: January 2021

Under an applied magnetic field of the order of 0.3 T, singlet exciton fission into two triplet excitons and the subsequent geminate fusion of the latter leads to long-lasting spin entanglement and quantum beats in the emitted fluorescence
Waveguide-QED with Atomic Matter Waves
Authors: Kim Youngshin , Stewart Michael , Kwon Joonhyuk , Lanuza Alfonso , Schneble Dominik
Published: January 2021

We present recent studies of waveguide quantum electrodynamics using ultra-cold atomic matter waves in an optical lattice.
Photon Statistics Effects on a QRNG of Vacuum Fluctuations
Authors: Dandasi Abdulrahman , Ozel Helin , Durak Kadir
Published: January 2021

Optical scattering enhances randomness characteristics, increases the chaotic behavior of coherent sources, broadens the distribution of photon statistics and makes it super-Poissonian which allows faster sampling compared to Poissonian.
Material dependence of plasmon-induced efficiency enhancement of solar cells metal-nano-modified
Authors: Jacak Janusz E. , Jacak Witold A.
Published: January 2021

Light absorption aided by localized plasmons in metalized solar cells needs a quantum approach going beyond the classical solution of the Maxwell-Fresnel problem for metallic nanoparticles deposited on the semiconductor. It is demonstrated for various material solar cell configurations.
Long-Pass Type Quantum Imaging Interferometer with Undetected Photons in the Infrared Wavelength Range
Authors: Jungbluth Bernd , Elsen Florian , Herbst Florian , Hoffmann Hans-Dieter
Published: January 2021

We present a parametric down conversion source in periodically poled lithium niobate, its application in a quantum interferometer at 1600 nm and a novel long-pass scheme to extend the operational range further into Mid-IR.
Noise and Resolution in Acetylene Based Self-Referencing Configuration for Detection of Optical Phase Modulation
Authors: Diaz Jordan I. , Stepanov Serguei , Casillas-Rodríguez Nayeli , Ocegueda-Miramontes Manuel I. , Hernández-Hernández Eliseo
Published: January 2021

We report experimental measurements of noises and resolution in a bulk self-referencing interferometric configuration based on quantum memory of acetylene (C2H2) molecules at the wavelength of 1530.37 nm of P9 absorption line.
Silicon nitride photonic molecules for robust sensing applications
Authors: Moras André L. , da Ascenção Gabriel R. , Pires Marcus V. A. , Junior Valnir C. S. , Barea Luis A. M. , Frateschi Newton C.
Published: January 2021

We propose a compact Si3N4 Photonic Molecule for robust and differential measurements in sensing applications. The simulations show that a refractive index sensitivity of 131.3 nm/RIU with high thermal stability can be achieved.
Possibilities of Polarization Multiplex Optimization Using the Tolerance Field Measurement
Authors: Kyselak Martin , Stohl Jakub , Vlcek Cestmir , Sychra Vojtech
Published: January 2021

This work describes a way to measure the Tolerance Field of a Polarization Division Multiplexing and verify the robustness of the system. The problem of polarization multiplex solves sudden polarization state changes in optical fiber.
Speckle-noise reduction in computer generated hologram, using a modular random phase pattern
Authors: Cruz Maria-Luisa
Published: January 2021

We present a modular random phase pattern, which uses small blocks of random phase avoiding symmetries in small zones. This phase reduces the speckle noise in computer generated holograms and it is independent of the object.
Plasmonic Modal and Polarization Filter Based on a Fractal-Like Photonic Crystal Fiber
Authors: Carvalho William O. F. , Mejía-Salazar J. R.
Published: January 2021

Multiple resonances in a photonic crystal fiber, based on an octagonal circular fractal geometry, with gold nanowires and thin layer is presented. Results have potential applications for modal and polarization filters.
Vibrationally mediated photodissociation of water dications
Authors: Kechaoglou Emmanouil , Kosmidis Constantine
Published: January 2021

The branching ratio between two dissociative channels of H2O2+ and D2O2+ was studied as a function of the ionizing-laser wavelength. The dications’ dissociation is found dependent on coupled electron-nuclear dynamics.
Tunable plasmonic color filter
Authors: Mastria Rosanna , Riisnaes Karl Jonas , Craciun Monica , Russo Saverio
Published: January 2021

Dynamic spectral tunability is a key feature for plasmonic color filter. We numerically investigate the tuning of resonance wavelength of gold-based plasmonic structure exploiting the electrochromism of tungsten trioxide.
Novel Beam Shaping Based All Optical Measurement Method For Free Charge Carriers Dynamics in Silicon
Authors: Tiferet Maor , Shabairou Nadav , Zalevsky Zeev , Sinvani Moshe
Published: January 2021

We demonstrate a new experimental algorithm for the diffusion length all optical measurement. This Measurement method is based on a novel Plasma Dispersion Effect based on beam shaping method that we demonstrated in the past.
High Efficiency Hemispherical Short Cavity Laser Direct Pumped by Great-Astigmatism Laser Diode
Authors: Han Q. , Kobayashi R. , Aoyagi Y. , Kawato S.
Published: January 2021

A laser-diode-pumped short cavity CW laser was investigated. The beam quality factors of the pump beam for the slow axis was 20. The optical conversion efficiency of 58.4% versus incident pump power was obtained.
Tunable Electro-Optical Metasurface Based on an Ultra-Strong Coupling Epsilon-Near-Zero System
Authors: Xie Ze Tao , Wu Jiaye , Fu H. Y. , Li Qian
Published: January 2021

We demonstrated a tunable electro-optical metasurface based on an ultra-strong coupling epsilon-near-zero indium tin oxide system. The formation mechanism of the Rabi splitting and the performance of the application have been analysed.