bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simultaneously Possessing High Quantum Efficiency and Thermal Robustness in a Near‐Infrared Emitting ZnAlB(1‐x)GaxO4:Cr3+ Phosphor
Authors: Lim Jin Xiang , Wang Hongcheng , Kang Xiaojiao , Lü Wei , Lim Chin Seong , Zhu Zhennan , Pan Qiwen , Sakundarini Novita , Chuah Yea Dat 
Published: August 2024

AbstractNear‐infrared (NIR) phosphors are a vital component of phosphor‐converted light‐emitting diodes (pc‐LEDs), with simultaneous high quantum efficiency and thermal stability being essential attributes for optimal performance. In this paper, a novel ZnAlB(1‐x)GaxO4:0.05Cr3+ system is designed by gradually substituting B with Ga. Surprisingly, a significant enhancement in photoluminescence performance is observed, reaching peak efficiency at x = 1. Further development led to a series of ZnAlGaO4:yCr3+ (ZAGO:yCr3+) phosphors, exhibiting variable full width at half maximum (FWHM) ranging from 32 to 163 nm with increasing Cr3+ content, attributed to energy transfer between two Cr3+ emission centers. Among these, ZAGO:0.05Cr3+ emerges as the optimal phosphor, boasting a high internal/external quantum efficiency of 80%/34% with a FWHM of 80 nm. Notably, this phosphor demonstrates anti‐thermal quenching behavior (125.53% @ 423 K), with its exceptional thermal stability elucidated through the defect level model. The fabricated NIR pc‐LEDs featuring ZAGO:Cr3+ phosphors show great prospect in multifunctional applications in plant cultivation, night vision, non‐destructive analysis and veins imaging.
Enhancing Brillouin Scattering with Chalcogenide Metasurfaces of Optical Bound States in the Continuum and Mechanical Resonances
Authors: Yuan Jin , Li Pengteng , Song Jingcui , Yang Shuixian , Lu Chao , Zhang Xin , Feng Tianhua , Li Zhaohui 
Published: August 2024

AbstractBrillouin scattering provides a unique approach in diverse applications ranging from sensing to signal processing and beyond. The recent advancement in Brillouin scattering research has been driven by the development of integrated photonic platforms. However, the realization of efficient Brillouin scattering with substantial gains at low pump powers within compact devices is still a challenge. Here, a chalcogenide metasurface is proposed and demonstrated as a promising candidate for facilitating spontaneous Brillouin scattering. By employing Ge25Sb10S65 materials with remarkable photoelastic properties and leveraging the capacity of metasurfaces to effectively confine light waves through quasi‐bound states in the continuum, alongside their ability to confine acoustic waves via mechanical resonances, a substantial Brillouin gain of up to 27.7 dB at a low pump power of 23 mW is achieved within a metasurface with a compact dimension of <0.03 cm. The superior performance of chalcogenide metasurfaces‐based Brillouin scattering may hold profound potential to advance Brillouin scattering research and find wide applications.
Novel Folded Structure TFLN Recycling Phase Modulator Enabling Large Low‐Vπ Bandwidth and Efficient Microwave–Optical Velocity Matching
Authors: Du Yongtao , Zou Xihua , Zou Fang , Pan Wei , Yan Lianshan , Zhao Qiang , Liu Naijin 
Published: August 2024

AbstractElectro–optic phase modulators (PMs) are critical components for modern communication, sensing, and microwave photonics. A recycling PM has been demonstrated to effectively reduce the half‐wave voltage (Vπ) while exhibiting resonant behavior for the driven microwave signals [Nature 612, 252 (2022)]. However, the significant optical delay of the loop‐back waveguide reduces the low‐Vπ bandwidth to 1.5 GHz. Herein, a novel folded structure is proposed for recycling PM fabricated on a thin‐film lithium niobate (TFLN) platform. The low‐Vπ bandwidth can be expanded by significantly reducing the optical loop‐back delay. Additionally, efficient velocity matching can be achieved by aligning the time delay between the microwave and optical signals. The proposed folded recycling PM, with a 0.6 × 12 mm2 footprint, is characterized by the lowest Vπ of 2–3 V in each modulation period across 3.5 to 40 GHz and a doubled low‐Vπ bandwidth of 3 GHz. As an application demonstration, such a folded recycling PM is employed for tunable optical frequency combs (OFCs) generation. Flat OFCs consisting of 15, 21, and 13 comb lines are generated with flexible comb spacings of 29.6, 31.3, and 33 GHz, respectively. The proposed novel modulator can find distinct applications in communication, sensing, and microwave photonics.
Photonic Square‐Root Second‐Order Topological Bound States in the Continuum
Authors: Yan Wenchao , Cheng Weizhao , Liu Quancheng , Liu Weijie , Zhang Bin , Ni Xiang , Chen Feng 
Published: August 2024

AbstractSecond‐order topological bound states in the continuum (SOTBICs) have received widely attention in photonics due to theirs counterintuitive localized properties. A model of square‐root SOTBICs is proposed that not only inherit topological features from its parent Hamiltonian, but also support multiple corner states with different propagation constants, a unique feature not found in its parent Hamiltonian. Using femtosecond laser‐writing technology, a photonic nontrivial 2D edge‐centered SSH lattice is fabricated and observe two types of localized corner states with distinct phase distribution. Interestingly, by using an auxiliary waveguide with defined refractive index and coupling into the array, it is experimentally demonstrated that corner states are embedded but do not hybridize with bulk states of the lattice. Additionally, it is experimentally verified that these square‐root SOTBICs are robust against disorders as long as the essential symmetries remain preserved. The work marks the instance of SOTBICs with multiple corner states in photonic lattices.
Fabrication of GelMA – Agarose Based 3D Bioprinted Photocurable Hydrogel with In Vitro Cytocompatibility and Cells Mirroring Natural Keratocytes for Corneal Stromal Regeneration
Authors: Vijayaraghavan Renuka , Loganathan Sravanthi , Valapa Ravi Babu 
Published: August 2024

AbstractThe complex anatomy of the cornea and the subsequent keratocyte‐fibroblast transition have always made corneal stromal regeneration difficult. Recently, 3D printing has received considerable attention in terms of fabrication of scaffolds with precise dimension and pattern. In the current work, 3D printable polymer hydrogels made of GelMA/agarose are formulated and its rheological properties are evaluated. Despite the variation in agarose content, both the hydrogels exhibited G′>G′′ modulus. A prototype for 3D stromal model is created using Solid Works software, mimicking the anatomy of an adult cornea. The fabrication of 3D‐printed hydrogels is performed using pneumatic extrusion. The FTIR analysis speculated that the hydrogel is well crosslinked and established strong hydrogen bonding with each other, thus contributing to improved thermal and structural stability. The MTT analysis revealed a higher rate of cell proliferation on the hydrogels. The optical analysis carried out on the 14th day of incubation revealed that the hydrogels exhibit transparency matching with natural corneal stromal tissue. Specific protein marker expression confirmed the keratocyte phenotype and showed that the cells do not undergo terminal differentiation into stromal fibroblasts. The findings of this work point to the potential of GelMA/A hydrogels as a novel biomaterial for corneal stromal tissue engineering.
Information security decisions of security‐interdependent firms in the presence of consumer sensitivity
Authors: Wu Yong , Jin Zhijie , Dai Tao , Yang Dong 
Published: August 2024

AbstractFirms suffer security‐interdependent risks while applying network technology, causing severe customer churn. This paper studies the security and price decisions of security‐interdependent firms that face security‐sensitivity consumers. We show that one firm's product price increases (decreases) with the other's security efforts under positive (negative) interdependence. Firms can overinvest or underinvest in security due to security interdependence. Two mechanisms are proposed to solve this distortion. In the Reward mechanism, the firms reward (penalize) the other under the positive (negative) interdependence. In the Outsourcing mechanism, the security service providers raise (reduce) the compensations with consumer sensitivity.
Motivations for a firm's willingness to standardize: A perspective based on collective action theory
Authors: Zhou Lijun , Li Yuting , Wang Dandan , Yang Jing 
Published: August 2024

AbstractStandards allow companies to improve their competitiveness and achieve their strategic goals. Encouraging a strong willingness among firms to develop and implement standards is a complex task; consequently, the linkages between internal and external factors influencing this willingness require further exploration. This study considers interorganizational learning as an intermediate mechanism for empirical research and investigates the relationship between external motivation for collective action and a firm's willingness to participate in standards development. To verify the proposed theoretical model, this study used a questionnaire to collect 205 responses from companies belonging to the Zhejiang Brand Building Association. Structural equation modeling was conducted to verify the research framework. The results of this study reveal that an association's organizational capability has a direct positive effect on its willingness to develop and implement standards; however, government support and industrial scale have no significant positive direct effects on collective action willingness. Moreover, knowledge acquisition and knowledge application have mediating effects on the relationship between external motivation for collective action and willingness for collective action. This study analyzes the factors influencing a firm's participation in standardization activities on the basis of a collective action perspective and the mediating role of interorganizational learning. This study contributes to the literature by developing collective action and interorganizational learning theories.
DELTA: A Modular, Transparent, and Efficient Synchronization of DLTs and Databases
Authors: Fernández‐Bravo Peñuela F. Javier , Arjona Aroca Jordi , Muñoz‐Escoí Francesc D. , Yatsyk Gavrylyak Yuriy , Illán García Ismael , Bernabéu‐Aubán José M. 
Published: August 2024

ABSTRACTBesides cryptocurrencies, DLTs may be also exploited in enterprise systems operated by a consortium of organizations. Their interaction takes usually place on a permissioned blockchain network that holds a set of data to be queried frequently. In this scope, the main problem of DLTs is their unsuitability for a fast service of complex queries on those data. In order to solve this issue, many proposals dump the ledger contents onto databases that, because of their own goals and design, are already optimized for the execution of those queries. Unfortunately, many of those proposals assume that the data to be queried consist in only a block or (cryptocurrency‐related) transaction history. However, those organization consortiums commonly store other structured business‐related information in the DLT, and there is an evident lack of support for querying that other kind of structured data. To remedy those problems, DELTA synchronizes, with minimal overhead, the DLT state into a database, providing (1) a modular architecture with event‐based handling of DLT updates that supports different DLTs and databases, (2) a transparent management, since DLT end users do not need to learn or use any new API in order to handle that synchronization (i.e., those users still rely on the original interface provided by their chosen DLT), (3) the efficient execution of complex queries on those structured data. Thus, DELTA reduces query times up to five orders of magnitude, depending on the DLT and the database, compared to queries directed to the ledger nodes.
Accurate data‐driven surrogates of dynamical systems for forward propagation of uncertainty
Authors: De Saibal , Jones Reese E. , Kolla Hemanth 
Published: August 2024

AbstractStochastic collocation (SC) is a well‐known non‐intrusive method of constructing surrogate models for uncertainty quantification. In dynamical systems, SC is especially suited for full‐field uncertainty propagation that characterizes the distributions of the high‐dimensional solution fields of a model with stochastic input parameters. However, due to the highly nonlinear nature of the parameter‐to‐solution map in even the simplest dynamical systems, the constructed SC surrogates are often inaccurate. This work presents an alternative approach, where we apply the SC approximation over the dynamics of the model, rather than the solution. By combining the data‐driven sparse identification of nonlinear dynamics framework with SC, we construct dynamics surrogates and integrate them through time to construct the surrogate solutions. We demonstrate that the SC‐over‐dynamics framework leads to smaller errors, both in terms of the approximated system trajectories as well as the model state distributions, when compared against full‐field SC applied to the solutions directly. We present numerical evidence of this improvement using three test problems: a chaotic ordinary differential equation, and two partial differential equations from solid mechanics.
The unique metabolome of clear cell ovarian carcinoma
Authors: Ji Jennifer X , Hoang Lien N , Cochrane Dawn R , Lum Amy , Senz Janine , Farnell David , Tessier‐Cloutier Basile , Huntsman David G , Klein Geltink Ramon I 
Published: August 2024

AbstractClear cell ovarian carcinoma (CCOC) is an aggressive malignancy affecting younger women. Despite ovarian cancer subtypes having diverse molecular and clinical characteristics, the mainstay of treatment for advanced stage disease remains cytotoxic chemotherapy. Late stage CCOC is resistant to conventional chemotherapy, which means a suboptimal outcome for patients affected. Despite detailed genomic, epigenomic, transcriptomic, and proteomic characterisation, subtype‐specific treatment for CCOC has shown little progress. The unique glycogen accumulation defining CCOC suggests altered metabolic pathway activity and dependency. This study presents the first metabolomic landscape of ovarian cancer subtypes, including 42 CCOC, 20 high‐grade serous and 21 endometrioid ovarian carcinomas, together comprising the three most common ovarian carcinoma subtypes. We describe a distinct metabolomic landscape of CCOC compared with other ovarian cancer subtypes, including alterations in energy utilisation and cysteine metabolism. In addition, we identify CCOC‐specific alterations in metabolic pathways including serine biosynthesis and ROS‐associated pathways that could serve as potential therapeutic targets. Our study provides the first in‐depth study into the metabolome of ovarian cancers and a rich resource to support ongoing research efforts to identify subtype‐specific therapeutic targets that could improve the dismal outcome for patients with this devastating malignancy. © 2024 The Author(s). The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland.
Effect of cobalt ferrite concentration on the EMI shielding effectiveness of cobalt ferrite/graphene based epoxy composites
Authors: S. Manobalan , Bose Suryasarathi , T. P. Sumangala 
Published: August 2024

AbstractThe study investigates the impact of cobalt ferrite (CF) concentration on the electrical, thermal, mechanical, magnetic, and electromagnetic interference (EMI) shielding effectiveness (SE) of Epoxy/Graphene/Cobalt ferrite composite samples. This paper presents the novel impact of agglomeration formation using an increased CF concentration, which results in the enhancement of electrical conductivity and slight decrease in EMI SE after 7% CF loading. The scanning electron micrograph provided a clear evidence for the formation of agglomeration with the increase of CF content. The amount of CF loading in Ep/Gr was varied steadily to achieve electrical percolation. The maximum tensile strength value of 21.6 MPa was observed for sample with 7% CF. The sample with 15% CF exhibited the maximum saturation magnetization of 7.5 emu/gm. TG‐DTA showed thermal degradation of all samples up to 800°C. The maximum shield effectiveness (SE), 16 dB was observed for sample with 7% CF in X band and 22 dB for sample with 10% CF in Ku band frequency range. The composites exhibited great absorption properties compared to reflection in both X band Ku band frequency range. These epoxy‐based composites are useful as cost effective EMI shielding material.Highlights
Hybrid filler (CF/graphene) addition alters properties of composites
Structural, thermal, mechanical, electrical and, magnetic properties of composites reported
Agglomeration of nanoparticles effect mechanical and EMI shielding properties.
Electrical conductivity improved with filler addition
The EMI Shield effectiveness is dominated by absorption loss in both X and Ku band
High performance poly(ethylene‐co‐vinyl acetate)/nickel oxide nanocomposite prepared through open mill mixing technique for energy storage applications
Authors: Shini M. , Arun K. , Ramesan M. T. 
Published: August 2024

AbstractPolymer nanocomposite films of poly(ethylene‐co‐vinyl acetate) (EVA) with different concentrations of nickel oxide (NiO) nanoparticles (NPs), produced by an open two‐roll mill mixing method. Structural characterization using Fourier transform infrared (FTIR), UV–visible spectroscopic studies and x‐ray diffraction (XRD) analysis showed elevated peak intensity for composites confirming good polymer‐filler interaction, optical clarity and improved crystallinity. Morphological analysis by field emission scanning electron microscopy (FE‐SEM) and high‐resolution transmission electron microscopy (HR‐TEM) revealed the structural regularity of nanocomposites (NCs). Augmented thermal stability, evident from thermogravimetric analysis (TGA) with increased decomposition temperature was corroborated by an increase in glass transition temperature (Tg) detected through differential scanning calorimetry (DSC) analysis. Dielectric constant and alternating current (AC) conductivity values increased with temperature, filler content and frequency. Composites containing 7 wt% NiO showed significant enhancements in mechanical properties compared to EVA, with tensile strength increasing by 122%, tear strength by 179.9%, and impact strength by 111.9%. EVA/10 wt% NiO composite exhibited the highest hardness increase of 11.9%, while elongation at break decreased by 8% for the same composition. The experimental results suggest that EVA/NiO nanocomposite films can be employed as promising alternatives for flexible dielectric substrates for optoelectronic devices.Highlights
A series of EVA/NiO NCs were prepared and characterized.
Enhanced optical property, thermal stability and Tg.
Possess excellent electrical properties.
Mechanical strength and impact resistance of EVA was greatly enhanced.
A promising material for flexible energy storage applications.
Tensile and flexural behavior of graphene‐reinforced carbon/epoxy composites manufactured via compression molding method
Authors: Shelar Mahendra L. , Suryawanshi Vinod B. , Wayzode Neerajkumar 
Published: August 2024

AbstractGraphene's unique characteristics have piqued a great deal of academic and industrial curiosity. Its potential as a composite material reinforcement is the subject of intensive study. When it comes to reinforcing fillers, graphene stands head and shoulders above the rest due to its remarkable thermal, electrical, and mechanical capabilities. Epoxy resin, is widely used in a variety of industrial processes, including the production of laminates, coatings, and composites due to its processing simplicity, its tenacious adhesion to substance types, and its resistance to chemical agents. The performance of the composite relies on how the graphene nanoparticles are dispersed and interact with the polymer. Graphene‐enhanced composites use a variety of methods, such as dispersing graphene in a polymer matrix, to incorporate the material into its structure. Composites find their most common use in competitive situations settings where elements like mass and mechanical characteristics are prioritized over economic consideration. The use of carbon fiber and other state‐of‐the‐art fibers in composite structures is becoming increasingly common. This study aims to conduct an experimental analysis of a graphene‐reinforced epoxy composite's flexural and tensile properties containing varying amounts graphene. In this study, a multi‐step procedure was designed to ensure uniform distribution graphene. The results of a study on tensile and flexural strength showed good enhancement at a weight percent of G0.6% compared to clean epoxy.Highlights
The novel method of manufacturing of graphene enhanced composite sheet.
The lower weight fraction of graphene gives good results in terms of mechanical properties.
Improvement in tensile strength by 53.35% and flexural test occurs of 8.04% in stress value at 0.6 wt% addition of Graphene
Tensile Modulus and flexural modulus improvement of 76.26% and 16.87% respectively at 0.6% of wt. of graphene
Fourier transform infrared spectroscopy showed promising results which shows existing of functionalized groups of amines.
Scanning electron microscopy revealed graphene's interaction with the polymer matrix at the interface.
Mechanical characterization and puncture resistance of 3D‐printed PLA lattice structures
Authors: Mani Megavannan , Murugaiyan Thiyagu , Shanmugam Vigneshwaran 
Published: August 2024

AbstractThe increasing application of additively manufactured (AM) materials in engineering and biomedical fields highlights the necessity of understanding their mechanical behavior, particularly with complex lattice structures. Polylactic acid (PLA), a popular biopolymer in additive manufacturing, exhibits mechanical characteristics highly dependent on its structural design. This research investigates the quasi‐static puncture failure analysis and mechanical characteristics of additively manufactured (AM) polylactic acid (PLA) materials with various lattice structures. The mechanical behavior, including tensile strength, flexural properties, interlaminar shear strength (ILSS), Izod impact resistance, and quasi‐static punch shear strength (QS‐PSS), was investigated following the respective ASTM protocols. Results indicate a 6% increase in tensile strength, to ca. 28 MPa, for the triangular PLA lattice structure compared with plain lattice structures. In the flexural test, the hexagonal structure showed a 13% increase in bending strength, to ca. 45 MPa, compared with the plain structure. Additionally, the hexagonal PLA lattice structure exhibited a 24% increase in shear strength, to approximately 8 MPa, over the plain lattice structure in the interlaminar shear strength analysis. In the Izod impact analysis, the plain lattice structure demonstrated a 17% increase in impact strength, to ca. 278 J/m, compared with the circular structure. A stainless‐steel hemispherical indenter was employed to investigate the quasi‐static punch shear behavior (QS‐PSS) of different lattice structures. The triangular structure displayed increased total energy absorption capacity and specific energy absorption of ca. 19 J and 0.529 J/g, respectively, compared with other lattice structures. These results are important for the creation of additively manufactured PLA lattice structures, improving the puncture resistance of advanced composites.Highlights
Polylactic acid (PLA) lattice structures were fabricated.
Plain, circular, triangular, and hexagonal lattice structures were investigated.
Lattice structures were used as reinforcements.
The triangular structure demonstrated improved strength.
The triangular structure reduced crack formation and propagation.