bluuebunny/crossref_metadata_2025 huggingface dataset:
Qualitative Assessment of Water Resources for Watering Livestock and Poultry: A Case Study of The Waters of Duhok Valley, Kurdistan Region of IRAQ
Authors: Qaseem Najlaa , Al-Saffawi Abdulazees , Khalid Maher
Published: September 2022

The current study was conducted to assess the water quality of Valley Duhok as a water source for drinking livestock and poultry in the region. Seventy-two water samples were collected from six sites in the valley to conduct physicochemical and biological tests, and the sub-index model (WQI) was applied to assess water quality.The results of the water quality index indicated that the water of Duhok Dam Lake (site N1) was of good quality for drinking livestock and poultry, while the rest of the sites on the valley were in the category of water very poor for drinking animals, with WQI values ranging from (204-286).This deterioration in water quality is a result of the relative increase in the three parameters of most of the studied properties, especially dissolved oxygen, organic load, and phosphate ions, to reach the values for the quality rating (Qi) and Sub-Index (Sbi)to(500and56.8),(1026and117)and(958and87.1)consecutively.
Synthetic Strategy to Amido Alkyl Naphthols from Pyrazole Aldehydes using Silica Supported NaHSO4.SiO2 as an efficient Heterogeneous Catalyst
Authors: Perci Sreedharan Helen , Jayanthi Selvaraj , Monisha Periyasamy , Gunasundari Kittappa , Pramesh Manickam
Published: September 2022

A facile and eminent method has been reported for the preparation of amido alkyl naphthols. Amido alkyl naphthol derivatives were synthesized by the condensation of pyrazole aldehydes, β-naphthol and acetamide in the presence of a heterogeneous SiO2 supported sodium hydrogen sulphate catalyst using acetic acid as a solvent. This protocol is advantageous for its shorter reaction hours, simplest workup technique, excellent yields with easy recovery and reusability of the catalyst.1H, and 13C Nuclear Magnetic Resonance, Fourier transform infrared and Mass Spectroscopy were utilized for the characterization of synthesized products.
Resistance of Wood Ash Concrete to Sulfuric Acid Attack
Authors: Kumar N. Venkata Sairam , Kranti J. Usha , Rao U. V. Narayana
Published: September 2022

This paper is aimed to present the residual compressive strength of wood ash (WA) concrete cube specimens after immersion in diluted sulfuric acid (H2SO4) solutions. The sulfuric acid resistance of WA concrete is observed using 2% and 5% H2SO4 solutions. WA is used as mineral admixture and the partial substitution levels of WA are 0% (CW0), 5% (CW5), 10% (CW10), 15% (CW15), and 20% (CW20) by weight of 53 grade Portland cement. WA concrete results are compared with the results of M30 grade concrete (CW0). At CW5 and CW10 replacement levels, a slight enhancement in the strength of WA concrete is noticed. No significant resistance to H2SO4 is observed with WA concrete when compared with CW0 concrete. Further, the deterioration of CW0, CW5, and CW10 concrete is similar. The substitution of WA with cement reduces the cement content and eventually gives fewer hydrated cementitious products that enable deterioration by H2SO4. Furthermore, WA helps in improving the density and filling capacity of the interaction transition zone of concrete which leads to the reduction of pores and capillary action. In brief, the use of WA in concrete benefits by converting environmental concern material into a sustainable resource in producing cementing materials.
ESTUDO DAS PRÁTICAS DE SUSTENTABILIDADE EM GRANDES EMPRESAS QUÍMICAS NA REGIÃO METROPOLITANA DE CAMPINAS
Authors: Pacobello Daniella Ribeiro , De Benedicto Samuel Carvalho , Da Silva Luiz Henrique Vieira , Siani Sergio Ricardo
Published: September 2022

Em anos recentes, a sociedade tem se conscientizado e se preocupado, progressivamente, com a degradação do meio ambiente. Nesse contexto, as organizações são pressionadas por legislações ambientais cada vez mais rigorosas. Assim, relacionar empresa e sustentabilidade é algo primordial e que valoriza a imagem organizacional. Mas para que uma organização seja considerada sustentável é necessário que haja uma interação entre as dimensões econômica, ambiental e social, algo conhecido como o Tripé da Sustentabilidade. Este artigo teve como objetivo diagnosticar o grau de envolvimento das empresas químicas da Região Metropolitana de Campinas com a questão da sustentabilidade. A pesquisa é de natureza qualitativa, descritiva e exploratória. Foram pesquisadas cinco grandes empresas e os dados foram coletados em seus respectivos Relatórios de Sustentabilidade. Os resultados da pesquisa apontaram que as empresas colocaram em prática o “Tripé da Sustentabilidade” além da compreensão avançada acerca de questões de natureza social e ambiental.
IDENTIFICAÇÃO DE CAUSAS DE REJEITOS, NO SETOR DE QUALIDADE , EM UMA INDÚSTRIA DE PRODUTOS DE HIGIENE
Authors: Fittipaldi Marco Aurélio Sanches , Sampaio Jociane
Published: September 2022

A empresa, objeto deste estudo, atua no segmento de higiene pessoal e é líder de mercado. Oferta produtos que atendem às necessidades de 1.5 bilhão de pessoas ao redor do mundo e apresentava perdas de produtos acabados por não conformidade. O objetivo foi estudar a qualidade como suporte para reduzir rejeitos. Realizou-se uma pesquisa-ação. Como fonte de dados foram utilizados os setores de qualidade e produção. Entre janeiro a abril de 2017 teve 473.280 unidades de absorventes rejeitadas por rasgos. Possíveis causas do problema: ausência de conhecimento operacional referente à qualidade, falha no desempenho da máquina e matéria prima não conforme. Foram realizadas intervenções para solucionar possíveis problemas. Ao examinar a matéria prima constatou-se não conformidade, fato que causava rejeitos e perda de R$ 176.398,00 com matéria prima e produtos acabados. Após a intervenção as perdas foram zeradas. As empresas devem avaliar continuamente seus fornecedores, independente de possuir ISO 9001.
ANÁLISE DA INOVAÇÃO NO SEGMENTO DA INDÚSTRIA DE CERÂMICA VERMELHA: Uma aplicação do radar da inovação
Authors: Cabral da Silva Wanderson Breno , Magalhães Correia Ana Maria
Published: September 2022

O objetivo desse artigo é analisar o grau de inovação organizacional das indústrias de cerâmica da cidade de Itajá/RN. A pesquisa se configurou como uma abordagem exploratória e descritiva, no qual, por meio da realização de entrevistas semiestruturadas com os gestores de oito empresas do segmento, estas foram analisadas quanto as treze dimensões do Radar da Inovação. Os resultados obtidos apontam para a inexistência da realização de grandes inovações nessas empresas nos últimos anos; sendo as medidas adotadas de caráter pontual e não sistemáticas, visando apenas a correção e otimização de funções administrativas e operacionais. Apesar disso, as conclusões indicam que é possível verificar o quanto as indústrias de cerâmica estão aplicando algumas ações necessárias para se manterem competitivas no mercado, por meio das poucas medidas implantadas por cada uma delas.
CARREIRA NA MATERNIDADE: A percepção de mulheres de uma cidade no norte do estado do Rio Grande do Sul
Authors: Petkowicz Aline Carla , Lazzari Neide Iara , Gallon Shalimar , Nardes Larissa
Published: September 2022

O desafio das mulheres, anteriormente, era apenas inserir-se no mercado de trabalho, hoje elas precisam superar obstáculos diversos para dar continuidade à sua carreira após a maternidade. Nesse contexto, o presente estudo objetiva analisar a percepção de mulheres residentes em uma cidade da região norte do estado do Rio Grande do Sul sobre a carreira após a maternidade. Em uma pesquisa qualitativa, realizaram-se, com mulheres que trabalham em empresas privadas, quinze entrevistas com roteiro semiestruturado, as quais foram analisadas por meio da análise de conteúdo. Os resultados revelaram que as mulheres têm a perspectiva de seguir uma carreira tradicional, mas, quando abordam sua trajetória, relatam uma carreira sem fronteiras e proteana. Elas relatam sentirem a necessidade de ter a licença-maternidade estendida para seis meses como maior benefício organizacional, bem como precisarem de políticas organizacionais que lhes deem suporte para conciliar carreira e maternidade.
Effect of dietary lysine on the growth performance of Pangasius hypophthalmus
Authors: Rachmawati Diana , Nurhayati Dewi
Published: September 2022

The success of intensive striped catfish (Pangasius hypophthalmus) cultivation requires quality feed that contains not only protein according to fish needs but also a complete essential amino acid profile to support the fish growth. One solution to overcome this problem is done through the addition of lysine in the feed commercial. This study aimed to examine the effect of lysine addition on the efficiency of feed utilization, growth and body composition of striped catfish (P. hypophthalmus). The study consisted of 4 (four) treatments those were with dosages of  0% / kg of feed (A); 0.6% / kg of feed (B); 1.2% / kg of feed (C); and 2.4% / kg of feed (D)  of lysine for every kg of feed.  The experimental diet in this study was a commercial feed in the form of pellets which was added with the lysine. A fixed feeding rate of 5%/weight of biomass/day was applied at frequency 3 times a day. The experimental fish used were striped catfish fingerling has an average weight of 4.13 ± 0.26 g/individuals. The results showed that the addition 1,2% / kg of lysine to the diet increased SGR, EFU, FCR, PER and protein content of the body composition of striped catfish.
Utilization of enzyme hydrolysis from Shrimp Head in improve the quality catfish
Authors: Untari Untari , Hukom Evi Hudriyah , Permata Reni
Published: September 2022

Protein is one of the most important components that can support the growth and development of catfish. The price of feed with high protein content which is relatively expensive is a big problem in the catfish farming process. On the one hand, there is shrimp head waste which is a source of protein with a protein content of 42.16% - 49.8% which has not been utilized and is disposed of as waste. Through this research, the shrimp head waste was carried out by an enzyme hydrolysis process to produce shrimp soluble extract (SSE) using a protease enzyme. The SSE that has been produced is then given to catfish aged 14 days to support the addition of protein sources for the growth of catfish. During the 1 month trial, there was a significant difference in results in the treatment catfish with the addition of 2% SSE compared to the control catfish. The addition of SSE gave a very good effect on the weight of catfish which was randomly distributed in a tank containing 50 catfish with an average initial weight of 0.6-0.8 grams. The provision of SSE was carried out simultaneously with the provision of standard fish feed, namely 3 times a day. The increase in catfish weight after being treated was about 2 grams/week. This indicates that SSE can increase the growth of catfish and can be used as an alternative supplement in the future because in addition to reducing the level of pollution due to catfish waste, it can also be a new discovery in the field of fisheries.
CHRONICLES OF A HOSTILE SUN, DE DIONE BRAND: ARS POÉTICA DE UNA POLÍTICA DE LOCALIZACIÓN
Authors: Galettini Azucena
Published: September 2022

Chronicles of the Hostile Sun (1984), el cuarto poemario de la poeta trinitense Dionne Brand es marcadamente político, pues evoca la revolución de Granada que ocurrió entre 1979-1983 y la ocupación estadounidense de la isla durante la operación denominada «Urgent Fury» en octubre de 1983. Es posible analizar este libro desde la interacción entre registro (diario) y poesía, y la reflexión que surge sobre la función del lenguaje poético frente al fracaso político. En ese sentido, el propósito del presente artículo es analizar la construcción metapoética que lleva a cabo Brand en este poemario a partir del concepto de política de localización, desarrollado por la geógrafa feminista Gillian Rose, inspirado en la poeta Adrianne Rich. Es desde allí que se puede construir un ars poética en esta obra de Brand, que se apoya en la búsqueda de pathos para construir hermandad, empatía, y cuyo fracaso quedará emparentado con la muerte de los ideales revolucionarios.
«POTSER HI HA ENCARA UNA MANERA DE FER BONA POESIA». INTERPRETACIÓ DE «MAÎTRESSE DE POËTE»
Authors: Capellas Franco Lucas
Published: September 2022

Aquest article proposa una interpretació de «Maîtresse de poëte», un dels poemes més hermètics de l’obra de Gabriel Ferrater. L’ús dels pronoms, les referències temporals, la sintaxi i la citació que el tanca exigeixen per part del lector un esforç hermenèutic que palesa la complexitat que pot assolir la poesia ferrateriana. A «Maîtresse de poëte» s’hi construeix el desdoblament d’una veu lírica que articula el procés de racionalització d’una experiència passada. El resultat és la formalització d’una crítica a l’escissió inevitable que provoca tot poema respecte de l’experiència poetitzada, la vida real. A aquest element crític de la poesia de Ferrater, indissociable d’una preocupació per l’especificitat de cada experiència, hi dedico, a mode d’introducció general, la part de l’article que antecedeix la interpretació del poema.
EL MITO EN LA LITERATURA LATINOAMERICANA: RELECTURA DE EL HABLADOR DE MARIO VARGAS LLOSA
Authors: Cadera Susanne M.
Published: September 2022

En el presente artículo se propone una relectura de la novela El hablador de Mario Vargas Llosa desde el punto de vista de la mitocrítica. La novela, publicada en 1987, ha sido analizada desde diferentes perspectivas; incluso existe un trabajo sobre los mitos que aparecen en la obra. Sin embargo, recientemente, se observa un creciente interés en el mito en la literatura latinoamericana surgida a partir del siglo XX, conjuntamente con el avance en general de la disciplina de la mitocrítica. El enfoque de la mitocrítica se centra en cómo aparecen los mitos en el día de hoy y qué función tienen en el medio en donde aparecen. En esta línea se aborda el análisis de la novela comparando el tratamiento del mito con tendencias observadas en otras obras latinoamericanas.
CRUCES ENTRE LITERATURA Y ARTE: LA ESTELA DUCHAMPIANA EN EL GRAN VIDRIO DE MARIO BELATTIN, LA VIRGEN CABEZA Y ROMANCE DE LA NEGRA RUBIA DE GABRIELA CABEZÓN CÁMARA
Authors: Ríos Marina
Published: September 2022

A partir de los fundamentos que el escritor César Aira desarrolla acerca del ready-made de Duchamp es posible considerar esta imagen-concepto como una figura del arte que opera en las ficciones contemporáneas. Este artículo se propone analizar tres narrativas contemporáneas latinoamericanas bajo la figura del ready-made con el objetivo de establecer cruces entre literatura y arte. Las ficciones son: El gran vidrio de Mario Bellatin, La virgen cabeza y Romance de la negra rubia de Gabriela Cabezón Cámara.
Application of Dual Comb Spectroscopy to Remote Sensing Applications: Recycling and Security
Authors: Horvath Raphael , Hayden Jakob
Published: September 2022

New developments of mid-infrared remote sensing applications based around a quantum cascade laser frequency comb spectrometer are reviewed and discussed. The high output of the lasers coupled with a high spectral resolution enables applications in explosive detection and recycling.
A novel handheld NIR spectral sensor module for the monitoring of moisture content and for plastic classification
Authors: Ou Fang , Sevo Petar , Petruzzella Maurangelo , van Klinken Anne , Hakkel Kaylee D. , van Elst Don M.J. , Li Chenhui , Pagliano Francesco , van Veldhoven Rene P.J. , Fiore Andrea
Published: September 2022

We present a novel approach to NIR spectral sensing using a handheld module based on a miniaturized integrated detector array. Applicability of the sensor is demonstrated in monitoring moisture in grains and classification of plastics.
From Visual Optics to Wavefront Sensors: Understanding the Role of Phase in Vision and Sensing of Aberrations
Authors: Vohnsen Brian
Published: September 2022

Oblique light at the retina is attenuated in the visual response due to the directionality of photoreceptors. Similar principles can be used when sensing aberrations. Here, we review our efforts from photoreceptors to wavefront sensing.
Fiber Bragg Grating Optical Sensors for Road Infrastructure Monitoring Applications
Authors: Braunfelds J. , Senkans U. , Skels P. , Murans I. , Porins J. , Spolitis S. , Bobrovs V.
Published: September 2022

Application of fiber Bragg grating (FBG) optical sensors for road infrastructure allows to use the measured data for transport traffic monitoring, structural health monitoring applications, architecture’s structural integrity estimation and temperature monitoring.
Thermal-optical characteristics analysis of an aerial camera optical
system
Authors: Wang Dongxue , Li Zhanguo , Lin Jieqiong , Lu Mingming , Li Yingchun , Ran Tonghuan
Published: September 2022

Ambient temperature is one of the important factors affecting the imaging quality of the optical system. Therefore, it is necessary to analyze the thermal-optical characteristics of the optical system when studying the imaging quality of the optical system. Taking the self-made aerial camera optical system as an example, this paper reports the use of the finite element software ANSYS to analyze the thermal stress of the aerial camera optical system, the use of the homogeneous coordinate transformation method to remove the rigid body displacement caused by the mirror surface, and the performance of a Zernike polynomial simulation on the processed surface data. Together, the Zernike coefficients obtained after the fitting are substituted into the ZEMAX optical software to express the surface shape obtained after deformation to analyze the changes in optical imaging quality under thermal environmental conditions. The results of the experiment show that when the working environmental temperature is 50°C, the (MTF) decreases from 0.371 to 0.315 and, when the working environmental temperature is

−

40

∘

C

, the MTF decreases from 0.371 to 0.285. The comparison results of the experiment and simulation show that the environmental temperature is heating up or, under the condition of cooling, the imaging quality of the aerial camera will be reduced. The thermal-optical analysis method can be used to simulate the actual use conditions of the aerial camera optical system and predict the imaging quality change trend of the optical system. The method of thermo-optical analysis has important guiding significance for the design of an optical-mechanical system.
Efficient graphene-based circularly polarized MIMO antenna for THz applications
Authors: Vamsi ChunchulaSai , Dwivedi Ajay Kumar , Bharti Gagandeep , Verma Vandna Rani , Sharma Anand
Published: September 2022

In this paper, a graphene-based (MIMO) antenna is designed and examined. Two unique properties of the proposed terahertz (THz) MIMO antenna are (1) circular polarization is achieved through an asymmetrical cross slot, etched over the graphene patch; and (2) a bidirectional radiation pattern is achieved through oppositely oriented identical antenna ports. Mutual coupling between the antenna ports is less than

−

35

d
B

. Due to the inclusion of the pattern diversity concept, a low value of envelope correlation coefficient is achieved. The proposed THz radiator operates over the frequency range of 4.67–4.87 THz, along with a 3 dB axial ratio between 4.76 and 4.81 THz. This type of antenna is widely employable for biomedical applications.
Simultaneous 2D temperature and velocity measurement using a
one-color-camera PLIF method combined with a physically constrained
temperature tagging method
Authors: Zhou Jiangning , Yang Wenbin , Zhou Quan , Yin Yimin , Chen Shuang , Mu Jinhe
Published: September 2022

A time-resolved two-color laser induced fluorescence method is proposed for simultaneous 2D temperature and velocity measurements for complex multi-phase flow. A temperature sensitive dye molecule is used for temperature and velocity tagging at the same time. To effectively eliminate the temperature deviation due to image misalignment, which is commonly seen at the multi-phase boundary, a one-color-camera system is proposed that can decrease the temperature deviation from 30°C–50°C to

<

10

∘

C

near the two-phase flow boundary with a high contrast ratio (0.41–0.43). Considering the strong influence of the thermal diffusion and convection processes to photo luminescence images’ intensities, which can lead to significant velocity calculation deviation, a physically constrained temperature tagging method is introduced. Through both a theoretical model and measurement results, the relative velocity deviation can be decreased from 77.6% to

<

10

%

by this method. This work can effectively improve the temperature and velocity measurement accuracy of a temperature sensitive particle/molecule tagging method in multi-phase flow with strong coupling of temperature and velocity.
Evaluation of a liquid membrane-based tunable lens and a solid-state LIDAR camera feedback system for presbyopia
Authors: Agarwala Rajat , Lukashova Sanz Olga , Seitz Immanuel P. , Reichel Felix F. , Wahl Siegfried
Published: September 2022

Presbyopia is an age-related loss of accommodation ability of the eye which affects individuals in their late 40s or early 50s. Presbyopia reduces the ability of a person to focus on closer objects at will. In this study, we assessed electronically tunable lenses for their aberration properties as well as for their use as correction lenses. The tunable lenses were evaluated in healthy subjects with cycloplegia by measuring visual acuity and contrast sensitivity for their use in presbyopia correction. Furthermore, we have developed and demonstrated the feasibility of a feedback mechanism for the operation of tunable lenses using a portable solid-state LIDAR camera with a processing time of 40 ± 5 ms.
Moiré artifacts reduction in Talbot-Lau X-ray phase contrast imaging using a three-step iterative approach
Authors: Tao Siwei , Xu Yueshu , Bai Ling , Tian Zonghan , Hao Xiang , Kuang Cuifang , Liu Xu
Published: September 2022

Talbot-Lau X-ray phase contrast imaging is a promising technique in biological imaging since it can provide absorption, differential phase contrast, and dark-field images simultaneously. However, high accuracy motorized translation stages and high stability of the imaging system are needed to avoid moiré artifacts in the reconstructed images. In this work, the effects of the stepping errors and the dose fluctuations on the transmission, differential phase contrast, and dark-field images are theoretically derived and systematically summarized. A novel three-step iterative method is designed for image reconstruction in Talbot-Lau interferometry with phase-stepping errors and dose fluctuations. Phase distributions, phase-stepping errors, and dose fluctuation coefficients are iteratively updated via the least square method until the convergence criteria are met. Moiré artifacts are mostly reduced via the proposed method in both the numerical simulations and experiments. The reconstructed images are highly coincident with the ground truth, which verifies the high accuracy of this method. The proposed algorithm is also compared with other moiré artifacts reduction algorithms, which further demonstrates the high precision of this algorithm. This work is beneficial for reducing the strict requirements for the hardware system in the conventional Talbot-Lau interferometry, such as the high accuracy motorized stages and the X-ray tube with high stability, which is significant for advancing the X-ray phase contrast imaging towards the practical medical applications.
Broadband transient absorption spectroscopy using an incoherent white-light source as probe
Authors: Younesi Ali Tayefeh , Ulbricht Ronald
Published: September 2022

Time-resolved spectroscopy and, in particular, transient absorption methods have been widely employed to study the dynamics of materials, usually achieving time resolution down to femtoseconds with measurement windows up to a few nanoseconds. Various techniques have been developed to extend the measurement duration up to milliseconds and beyond to permit probing slower dynamics. However, most of these either demand complicated and expensive equipment or do not provide broadband spectral coverage. This paper proposes a transient absorption technique in which an ultra-short pulse laser and a broadband incoherent continuous-wave light source are employed as pump and probe, respectively. Detection of the transient probe transmission is performed in a time-resolved fashion with a fast photodiode after a monochromator and the data is recorded with an oscilloscope. The time resolution is determined by the electronic bandwidth of the detection and acquisition devices and is ∼1 ns, with a measurement duration window of up to milliseconds and a spectral resolution of <2 nm covering from 0.4 to 2 µm. In addition, the setup can be employed to measure time- and spectrally-resolved photoluminescence.
Near-perfect (>99%) dual-band absorption in the visible using ultrathin semiconducting gratings
Authors: Gong Tao , Munday Jeremy N.
Published: September 2022

Electromagnetic perfect absorption entails impedance-matching between two adjacent media, which is often achieved through the excitation of photonic/plasmonic resonances in structures such as metamaterials. Recently, super absorption was achieved using a simple bi-layer configuration consisting of ultrathin lossy films. These structures have drawn rising interest due to the structural simplicity and mechanical stability; however, the relatively broadband absorption and weak angular dependence can limit its versatility in many technologies. In this work, we describe an alternative structure based on an ultrathin semiconducting (Ge) grating that features a dual-band near-perfect resonant absorption (99.4%) in the visible regime. An angular-insensitive resonance is attributed to strong interference inside the ultrathin grating layer, akin to the resonance obtained with a single ultrathin planar film, while an angular-sensitive resonance shows a much narrower linewidth and results from the diffraction-induced surface mode coupling. With an appropriately designed grating period and thickness, strong coherent coupling between the two modes can give rise to an avoided-crossing in the absorption spectra. Further, the angular-insensitive resonance can be tuned separately from the angularly sensitive one, yielding a single narrow-banded absorption in the visible regime and a broadband absorption resonance that is pushed into the near-infrared (NIR). Our design creates new opportunities for ultra-thin and ultra-compact photonic devices for application in technologies including image sensing, structural color-filtering and coherent thermal light-emission.
Side-by-side comparison of LIDT of MF and RF magnetron sputtered mirrors at a central wavelength of 1064 nm
Authors: Pervak V. , Pistner J. , Jensen L. , Maedebach H. , Guggenmos A.
Published: September 2022

Here we present a side-by-side comparison of LIDT of highly-reflective
mirrors at a central wavelength of 1064 nm produced via MF magnetron-
and RF magnetron-sputtering deposition methods. The latter sample
demonstrates LIDT >90 J/cm2.
Continuous ultra-thin silver films obtained by a two-step method for improved control of the optical and microstructural characteristics
Authors: Rumsby P. , Baloukas B. , Zabeida O. , Martinu L.
Published: September 2022

A deposition-and-etch process allows one to obtain continuous thin films below the regular percolation threshold, enabling the deposition of ultra-thin silver films in atypical conditions, yielding improved microstructures and/or optical properties.
Development and applications of ultra-thin metallic films fabricated by Physical Vapor Deposition
Authors: Moreau Antonin , Shurvinton Riley , Morati Nicolas , Lemarchand Fabien , Eles Balint , Destouches Nathalie , Lumeau Julien
Published: September 2022

In this study, we explore the specificities of ultra-thin metallic films deposited by electron beam deposition. Fabrication difficulties and repeatability are first presented. Applications such as metasurfaces or metal-dielectric structures for color control are then discussed.
Combined antifogging and antireflective double nanostructured coatings for LiDAR applications
Authors: Gärtner Anne , Schulz Ulrike , Sabbagh Ahmad , Rickelt Friedrich , Bingel Astrid , Wolleb Sabrina , Schröder Sven , Tünnermann Andreas
Published: September 2022

With commercial plasma-ion-assisted deposition technology, we generated a very convincing combination of an antireflective double-nanostructure on top of an antifog coating with long-term stable properties. The nanostructure does not affect the antifog properties and can be successfully used for LiDAR applications.
Laser-induced thermal radiation of optical thin films
Authors: Rouquette P. , Amra C. , Zerrad M. , Grèzes-Besset C. , Krol H.
Published: September 2022

Photo-induced thermal radiation of multilayer optics is analytically
modelized and implemented. The results provide temporal, wavelength,
and angular radiation patterns. Specific designs are presented to
shape thermal emission.
Bottom-up thin films resonators for enhanced absorption at optical frequency
Authors: Bouanane I. , Le Rouzo J. , Margeat O. , Capitaine A. , Sciacca B. , Berginc G. , Escoubas L.
Published: September 2022

We demonstrate simulation and realization of thin films silver nanorings with realistic geometric parameters showing enhancement of absorption at optical frequencies. Parametric studies are performed by FDTD simulations. The realization is made via bottom-up techniques.
Iso-frequency curve of a stratiform hyperbolic metamaterial composed of symmetrical film stack
Authors: Jen Yi-Jun , Chan Teh-Li
Published: September 2022

The iso-frequency curves of a stratiform hyperbolic metamaterial were calculated with effective medium approximation and model of symmetrical film stack. The curves were compared for a hyperbolic metamaterial at different metal fill-fractions.
Fano-like resonances in modulated single-layers for angular and frequency selectivity of light
Authors: Nikitina Julianija , Babayigit Ceren , Staliūnas Kęstutis , Grinevičiūtė Lina
Published: September 2022

The conformal deposition of high refractive index films on the
modulated surface was investigated. Fabricated single-layer photonic
structures show sharp angle-wavelength sensitivity of transmission and
imply spatial and spectral filtering abilities.
Pulse Ionized Silicon Nanostructures: Investigation of Optical Properties
Authors: Jamwal Nishant Singh , Kiani Amirkianoosh
Published: September 2022

We introduce a method for increasing silicon band gap via ultrashort laser pulse ionization. Different silicon nanostructures have been generated by varying the ablation scanning speed and the optical properties were examined.
Substrate-free Miniaturized Coarse Wavelength Division Multiplexing Filters
Authors: Rüsseler Anna K. , Gehrke Philipp , Hoffmann Gerd A. , Schönsee Guido , Thiel Axel , Vitt Martina , Wienke Andreas , Ristau Detlev
Published: September 2022

To unlock the benefits of thin-film filters, produced by means of ion beam sputtering, for compact, hybrid integrated optical systems, we have implemented a sacrificial-substrate approach to create high-precision, miniaturized, substrate-free filters.
Ultra-Broadband Near-Infrared/Mid-Infrared Beamsplitter for Bio-Medical Laser Applications
Authors: Amochkina Tatiana , Hahner Daniel , Trubetskov Michael , Kassab Hadil , Pupeza Ioachim , Krausz Ferenc , Pervak Vladimir
Published: September 2022

A novel ultra-broadband beamsplitter operating in the near-infrared range around 1030 nm and in the mid-infrared range 3-12 µm for bio-medical laser applications was designed and produced. Thin-film materials were ZnS and YbF3.
Micro-cavity optimization for ultra-sensitive all-dielectric optical sensors
Authors: Rouquette Paul , Amra Claude , Zerrad Myriam , Lequime Michel
Published: September 2022

We present an analytical method for the optimization of luminescent micro-cavities to create a substrate that is extremely sensitive to contamination. This process provides an alternative to sensors based on illumination in free space.
Third-order dispersion compensating mirror pair for 2µm-based laser systems
Authors: Hahner Daniel , Steinleitner Philipp , Chen Yu , Mak Ka Fai , Krausz Ferenc , Pervak Vladimir
Published: September 2022

A third-order dispersion compensating mirror pair was designed, produced and characterized. It covers the spectral range from 1.2-3.2µm. This is shown by the application in a Cr:ZnS laser system.
Multilayer Optical Element for Laser Pulse Elongation
Authors: Amochkina Tatiana , Trubetskov Michael , Hahner Daniel , Jacob Philip , Weigel Alexander , Pupeza Ioachim , Pervak Vladimir
Published: September 2022

A novel multilayer elongation optical element is developed, produced, and characterized. The element elongates a mid-infrared pulse and provides a monochromatic mid-infrared waveform for electro-optic delay tracking.
New Cavity-like Filters with Absorbing Layers
Authors: Southwell William H.
Published: September 2022

Two new narrowband filter types are presented: narrowband reflectors and narrowband absorbers. Both are related to the familiar narrowband pass cavity filter, but which include a thin absorbing layer.
Visualization of Simulated Coating Efficiency and Uniformity
Authors: Tilsch Markus Kurt , Nybank Eric
Published: September 2022

For a line-of-sight coating uniformity model, the source distribution
is normalized to quantify material utilization. Visualizations of
simulations in a 2D parameter space assist understanding of geometry
tradeoffs as shown for a planetary system.
Conformal optical coatings on complex 3D-macrostructures using atomic layer deposition
Authors: Rönn John , Konttinen Mikko , Niiranen Kalle , Saarniheimo Mikael , Sneck Sami
Published: September 2022

We present conformal optical coatings on complex 3D-macrostructures using atomic layer deposition. For 13 different low-loss oxide processes, we report thickness and refractive index non-uniformities of 0.43-2.64% and 0.04-0.42%, respectively.
Inline Magnetron Sputtering for Optical Filters on Flat and Curved Glass Substrates
Authors: Gloess Daniel , Hartung Ullrich , Drescher Andy , Neidhardt Joerg , Frach Peter , Bartzsch Hagen
Published: September 2022

Inline magnetron sputtering allows deposition of precise optical filters on large substrates. Examples of filters deposited on flat and curved glass substrates will be presented.
Investigation of gasochromic properties of WO3 thin films based on the analysis of the complex refractive index
Authors: Mazur Michał , Domaradzki Jarosław , Jędrzejak Tomasz , Wojcieszak Damian , Kaczmarek Danuta , Lubańska Aneta
Published: September 2022

The paper presents a proposal to link the change in the optical properties of a gasochromic material (WO3) with a gas medium (H2) based on the analysis of the dispersion of the complex refractive index.
Humidity Induced Changes in Group Delay Dispersion of Chirped Mirrors with Porous Top Layer
Authors: Melnikas Simas , Ramalis Lukas , Kičas Simonas , Tolenis Tomas
Published: September 2022

Chirped mirrors with porous top layer (CMPTL) feature broadband dispersion control. In this work, CMPTL for broadband spectral range was designed and deposited. Additionally, sensitivity of CMPTL spectral parameters to humidity in air was investigated.
Fabrication of a bi-directional dark mirror coating
Authors: Pan Frank , Stuart Sean C. , Vore Adam G. , Lampen Sara , Hackwell John A. , Fuqua Peter D. , Barrie James D.
Published: September 2022

A novel hyperspectral imager design required a slit mask with bi-directional reflectance suppression between 600nm to 1650nm. A dark mirror coating was fabricated and patterned on a commercial off the shelf (COTS) edge filter.
Femtosecond Laser Induced Surface Treatment of Nanograting for Enhanced Extinction Ratio of Wire-Grid Polarizer in Mid-Wavelength Infrared Range
Authors: Kim Hyesu , Ji Seok Young , Cho Sung-Hak , Jung Joo-Yun , Chang Won Seok
Published: September 2022

Femtosecond laser induced polishing and annealing was developed to enhance the performance limitations of WGP in Mid-infrared range, fabricated by nanotransfer printing. The extinction ratio of WGP is up to 31 dB, a factor of 3 compared with non-processed WGP.
Nanostructured coatings for anisotropy and Fano-like resonances
Authors: Nikitina Julianija , Tolenis Tomas , Ramalis Lukas , Babayigit Ceren , Gailevičius Darius , Staliunas Kestutis , Grineviciute Lina
Published: September 2022

In this study two topics are presented: i) anisotropic coatings for phase and polarization control and ii) dielectric structures with periodic modulation of optical constants together with the application of angular filtering of light.
Structural Modifications in Amorphous Oxide Nanolaminates with Annealing
Authors: Castro-Lucas Samuel Yvan , Yang Le , Fazio Mariana , Markosyan Ashot , Bassiri Riccardo , Fejer Martin M. , Menoni Carmen S.
Published: September 2022

Nanolaminates of TiO2/Ta2O5, SiO2/Ta2O5 and TiO2/GeO2 are investigated to assess structural modifications with annealing. Depending on the nanolaminate composition, annealing is shown to enhance cation diffusion.
Characterization of Electron-beam Deposited TiO2/SiO2 Coatings Based on Multi-Sample Photometric and Ellipsometric Data
Authors: Amochkina Tatiana , Trubetskov Michael , Janicki Vesna , Parramon Jordi Sancho
Published: September 2022

A post-production characterization approach based on spectral photometric and ellipsometric data related to a specially developed set of samples is proposed. Reliability of the approach is demonstrated.
GLACIER-C: A supercontinuum cavity ring-down reflectometer for measuring the total losses of low-loss optical coatings between 450 and 2000 nm
Authors: Oliver Verónica , Kreiner Asger , Zhan Minjie , Cardenas Daniel , Guggenmos Alexander , Pervak Vladimir
Published: September 2022

GLACIER-C, a development of UltraFast Innovations, measures the reflectivity and total losses of optical coatings between 1000 and 5 ppm with unprecedented broad wavelength tunability solving a major drawback of cavity ring-down reflectometers.
The potential of microstructure diagnostics for the evaluation and development of ophthalmic lens coatings
Authors: Feder René , Krieger Michael , Patzig Christian , von Blanckenhagen Bernhard , Höche Thomas
Published: September 2022

Nowadays, coating development and understanding of failure patterns on ophthalmic lens coatings requires state-of-the-art microstructure diagnostics. The potential of different methods (SEM-FIB, ToF-SIMS, HR-(S)TEM) is evaluated and illustrated using selected results.
Advancements in High Fluence Meter-Size Multilayer Dielectric Gratings for Ultrafast Lasers
Authors: Nguyen Hoang T. , Hickman Brad , Jackson Candis , Nissen James , Tardif Sean , Gaul Erhard , Kramer Daniel , Havlíčková Irena
Published: September 2022

We have developed a new class of meter-sized, multilayer dielectric
gratings designed for operating at 1060nm. The design allows for 3.4X
more total energy on the grating compared to the present state of the
art.
Laser resistance optimization of multilayer dielectric pulse compression gratings by reducing the electric field intensity through the dielectric mirror designs
Authors: Diop Saaxewer , Chorel Marine , Lavastre Éric , Gallais Laurent , Lamaignère Laurent , Bonod Nicolas
Published: September 2022

To improve laser damage resistance of multilayer dielectric pulse compression gratings, we numerically evidenced that for a given etching profile, the mirror design can minimize the electric field intensity in pillars with significant variations.
Resonant dielectric multilayers improving fluorescence imaging
Authors: Mouttou A. , Lemarchand F. , Gourdelier M. , Koc C. , Moreau A. , Muriaux D. , Lumeau J. , Favard C. , Lereu A. L.
Published: September 2022

We present dedicated dielectric multilayers (DM) optimized to be resonant under TIRF-microscopy constraints. By investigating DM enhancement and transmission, we could predict and measure a fluorescence signal enhanced by a factor of 3.
Optical Coatings for mid-IR DFG-based Next Generation Transceivers for Optical SATCOM
Authors: Poitras Daniel , Flannigan Liam , Xu Chang-Qing
Published: September 2022

As optical satellite communication becomes a topic of interest for data communication (ex: 5G), there is a need for reliable and cheap ground based optical transceivers and receivers. In this work, we are interested in the design and fabrication optical coatings required to optimize the performance of 3.4-µm laser sources based on difference frequency generation (DFG) in a PPLN crystal, from 1064 nm and 1550 nm laser light.
High throughput low cost closed field magnetron sputter deposition of durable reflectors based on dielectric overcoated metal for application in non-dispersive infrared gas sensors
Authors: Oliver Greig , Pomfret Jonathan , Gibson Des , Fleming Lewis , Ahmadzadeh Sam , Mcgann Greg , Song Shigeng , Navabpour Parnia , Sun Hailin , Mackay Peter
Published: September 2022

Optical & mechanical properties of closed-field magnetron pulsed DC sputter deposited Al, Au & Ag with Al2O3 protective layer are presented. Results show optical & durability performance suitable for use within NDIR optical gas sensors.
Nucleation in situ of perylene crystal by femtosecond laser induced cavitation
Authors: Wang Shen-Yuan , Liu Yue-Feng , Liang Shu-Yu , Feng Jing
Published: September 2022

Organic semiconductor single crystal materials have broad application prospects in the field of high-performance optoelectronic devices because of their highly ordered structure, few defects, and high carrier mobility. However, it is difficult to control the nucleation location of crystal formation in the current commonly used crystal growth methods including physical vapor transport and solution processing, which makes it difficult to manufacture organic crystal devices. Laser-induced crystallization technology is expected to solve this problem. In this study, we demonstrated nucleation in situ of a perylene crystal by femtosecond laser induced cavitation. The results show that the crystallization of perylene crystals induced by the femtosecond laser is mainly due to the aggregation effect by laser cavitation bubbles caused by multiphoton absorption. This strategy facilitates the application of organic single crystals to optoelectronic devices.
Explaining the temperature-induced shift of the V-O charge transfer band experimentally and design of single-excitation ratiometric optical thermometry
Authors: Zhou Shaoshuai , Wang Wei
Published: September 2022

Temperature-induced redshift of the V-O charge transfer band (CTB) is promising for designing high performance optical thermometry. The shift mechanism is considered as the thermal populations of high vibrational energy levels of the VO43− ground state. Direct experimental evidence for this, however, is still lacking. In this work, Tm3+-doped YVO4 with various doping concentrations was studied to achieve strong 1D2 emission of Tm3+. The temperature dependent CTB was studied at low temperatures to give direct evidence experimentally for the shift mechanism of the CTB using YVO4:20% Tm3+. It was found that the V-O CTB does not shift when the temperature is lower than a certain temperature (60 K), verifying the proposed shift mechanism experimentally. In addition, based on the temperature quenching of 1D2 emission of Tm3+ and the redshift of the CTB, single-excitation ratiometric thermometry was carried out using YVO4:30% Tm3+,6% Sm3+. High relative sensitivity was achieved with a maximal value reaching up to 3.86% K−1 at approximately 355 K.
Phase Change Materials for Optics and Photonics: feature issue introduction
Authors: Ríos Carlos , Zhou Linjie , Michel Ann-Katrin U. , Majumdar Arka , Hu Juejun
Published: September 2022

We introduce the Optical Materials Express feature issue on Phase Change Materials for Optics and Photonics. This issue comprises a collection of seventeen manuscripts on the development, characterization, control, and applications of optical Phase Change Materials.
Dynamical modeling of the H3K27 epigenetic landscape in mouse embryonic stem cells
Authors: Newar Kapil , Abdulla Amith Zafal , Salari Hossein , Fanchon Eric , Jost Daniel
Published: September 2022

The Polycomb system via the methylation of the lysine 27 of histone H3 (H3K27) plays central roles in the silencing of many lineage-specific genes during development. Recent experimental evidence suggested that the recruitment of histone modifying enzymes like the Polycomb repressive complex 2 (PRC2) at specific sites and their spreading capacities from these sites are key to the establishment and maintenance of a proper epigenomic landscape around Polycomb-target genes. Here, to test whether such mechanisms, as a minimal set of qualitative rules, are quantitatively compatible with data, we developed a mathematical model that can predict the locus-specific distributions of H3K27 modifications based on previous biochemical knowledge. Within the biological context of mouse embryonic stem cells, our model showed quantitative agreement with experimental profiles of H3K27 acetylation and methylation around Polycomb-target genes in wild-type and mutants. In particular, we demonstrated the key role of the reader-writer module of PRC2 and of the competition between the binding of activating and repressing enzymes in shaping the H3K27 landscape around transcriptional start sites. The predicted dynamics of establishment and maintenance of the repressive trimethylated H3K27 state suggest a slow accumulation, in perfect agreement with experiments. Our approach represents a first step towards a quantitative description of PcG regulation in various cellular contexts and provides a generic framework to better characterize epigenetic regulation in normal or disease situations.
Impact of long-term COVID on workers: A systematic review protocol
Authors: do Prado Camila Bruneli , Emerick Giselly Storch , Cevolani Pires Luciana Bicalho , Salaroli Luciane Bresciani
Published: September 2022

Introduction

Part of the patients infected by COVID-19 have at least one lasting sequel of the disease and may be framed in the concept of long Covid. These sequelae can compromise the quality of life, increase dependence on other people for personal care, impair the performance of activities of daily living, thus compromising work activities and harming the health of the worker. This protocol aims to critically synthesize the scientific evidence on the effects of Covid-19 among workers and its impact on their health status and professional life.

Method

Searches will be performed in MEDLINE via PubMed, EMBASE, Cochrane Library Central, Web of Science, Scopus, LILACS and Epistemonikos. Included studies will be those that report the prevalence of long-term signs and symptoms in workers and/or the impact on their health status and work performance, which may be associated with Covid-19 infection. Data extraction will be conducted by 3 reviewers independently. For data synthesis, a results report will be carried out, based on the main outcome of this study.

Discussion

This review will provide evidence to support health surveillance to help decision makers (i.e. healthcare providers, stakeholders and governments) regarding long-term Covid.

Trial registration

PROSPERO registration number: CRD42021288120. https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42021288120.