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https://read.qxmd.com/read/30876597/a-paper-based-device-for-simultaneous-determination-of-antioxidant-activity-and-total-phenolic-content-in-food-samples
#1
Chanoknan Puangbanlang, Kitima Sirivibulkovit, Duangjai Nacapricha, Yupaporn Sameenoi
We report the first use of a paper-based device as a simple, low-cost and rapid detection platform for simultaneous determination of antioxidant activity and total phenolic content in food samples. Two antioxidant activity assays including 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonate) radical cation (ABTS) assay and cupric reducing antioxidant capacity (CUPRAC) assay and one total phenolic content assay, Folin Ciocaltue reagent (FC) assay were simultaneously employed as a proof-of-concept. The device composed of a central sample zone connected to four pretreatment zones and consecutive detection zones to accommodate all three assays and a sample blank measurement...
June 1, 2019: Talanta
https://read.qxmd.com/read/30876248/nonlinear-optical-properties-of-mos-2-ws-2-heterostructure-in-fiber-lasers
#2
W J Liu, M L Liu, B Liu, R G Quhe, M Lei, S B Fang, H Teng, Z Y Wei
As a saturable absorption material, the heterostructure with the van der Waals structure has been paid much attention in material science. In general, the heterogeneous combination is able to neutralize, or even exceed, the individual material's advantages in some aspects. In this paper, which describes the magnetron sputtering deposition method, the tapered fiber is coated by the MoS2 -WS2 heterostructure, and the MoS2 -WS2 heterostructure saturable absorber (SA) is fabricated. The modulation depth of the prepared MoS2 -WS2 heterostructure SA is measured to be 19...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30876167/realization-of-perfect-selective-absorber-based-on-multipole-modes-in-all-dielectric-moth-eye-structure
#3
Chang Liu, Tiesheng Wu, Yumin Liu, Jing Li, Yu Wang, Zhongyuan Yu, Han Ye, Li Yu
Perfect absorbers play crucial roles in optical functional devices. Among various types of absorbers, moth-eye structures are known for their excellent absorbing efficiency. In this paper, we apply an electromagnetic multipole expansion method to treat an isolated all-dielectric moth-eye structure as a large particle and calculate various electric and magnetic multipole modes within the moth-eye structure. In periodical array, the multipole modes within each particle interact with each other. These constructive or destructive interactions cause shifts in the multipole resonant peaks...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30876041/achieving-subwavelength-field-confinement-in-sub-terahertz-regime-by-periodic-metallo-dielectric-waveguides
#4
Ali Tehranian, Mehdi Ahmadi-Boroujeni, Afshin Abbaszadeh
In this paper, we report on a periodic metallo-dielectric structure that supports geometry-induced surface plasmons in the sub-terahertz regime. The proposed structure is made up of a dielectric-coated metallic grating sandwiched by parallel metal plates. Based on the modal analysis of 2D and 3D structures, the impact of a metal cladding and a customized dielectric coating on the dispersion relation and field distribution of the guided surface wave is investigated. It is found that modal field confinement is improved in the presence of a metal cladding without narrowing the operational bandwidth of the waveguide...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30876009/plasmonic-polarization-beam-splitting-based-on-single-silver-nanowire
#5
Longkun Yang, Pan Li, Zhipeng Li
Plasmonic waveguides have been indispensable "building-blocks" to construct functional elements for future integrated nano-photonic devices and circuits. In this paper, we demonstrate that a thick silver nanowire with well-defined end facets can provide multiple outcoupling channels, and the controllable beam splitting is realized. The propagating surface plasmons emission at nanowire end are split into two parts: I1 and I2 , with the polarizations nearly perpendicular to the respective emitting facets...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30875786/inorganic-and-hybrid-perovskite-based-laser-devices-a-review
#6
REVIEW
Minas M Stylianakis, Temur Maksudov, Apostolos Panagiotopoulos, George Kakavelakis, Konstantinos Petridis
Inorganic and organic-inorganic (hybrid) perovskite semiconductor materials have attracted worldwide scientific attention and research effort as the new wonder semiconductor material in optoelectronics. Their excellent physical and electronic properties have been exploited to boost the solar cells efficiency beyond 23% and captivate their potential as competitors to the dominant silicon solar cells technology. However, the fundamental principles in Physics, dictate that an excellent direct band gap material for photovoltaic applications must be also an excellent light emitter candidate...
March 14, 2019: Materials
https://read.qxmd.com/read/30875737/multiplexed-paper-microfluidics-for-titration-and-detection-of-ingredients-in-beverages
#7
Alisha Prasad, Tiffany Tran, Manas Ranjan Gartia
Food safety and access to systematic approaches for ensuring detection of food hazards is an important issue in most developing countries. With the arrival of paper-based analytical devices (µPADs) as a promising, rapid, easy-to-use, and low-cost analytical tool, we demonstrated a simple microfluidic-based titration study for the analysis of packaged fruit juices. Similar, to the titration experiments using traditional glassware in chemistry laboratories, in this study the titration experiments were developed using paper microfluidics for the analysis of several analytes such as pH, vitamin C, sugars, and preservatives present in the packaged fruit juices...
March 14, 2019: Sensors
https://read.qxmd.com/read/30875629/recent-advances-in-thread-based-microfluidics-for-diagnostic-applications
#8
REVIEW
Xuan Weng, Yuejun Kang, Qian Guo, Bei Peng, Hai Jiang
Over the past decades, researchers have been seeking attractive substrate materials to keep microfluidics improving to outbalance the drawbacks and issues. Cellulose substrates, including thread, paper and hydrogels are alternatives due to their distinct structural and mechanical properties for a number of applications. Thread have gained considerable attention and become promising powerful tool due to its advantages over paper-based systems thus finds numerous applications in the development of diagnostic systems, smart bandages and tissue engineering...
March 8, 2019: Biosensors & Bioelectronics
https://read.qxmd.com/read/30874219/pattern-recognition-system-based-on-photoanisotropic-copies
#9
Barbara Kilosanidze, George Kakauridze, Irine Kobulashvili
In this paper, we present a method of pattern recognition based on obtaining the photoanisotropic copies of object images. Such copies are induced on the dynamic polarization-sensitive material when the amplitude image of the object formed by a spatial light modulator is transilluminated by linearly polarized light with a wavelength actinic for the used material. In this case, the distribution of the intensities over the amplitude image is converted into the distribution of photoanisotropy over the sample of a polarization-sensitive material...
March 1, 2019: Applied Optics
https://read.qxmd.com/read/30874154/low-cost-gaussian-beam-profiling-with-circular-irises-and-apertures
#10
Tariq Shamim Khwaja, Syed Azer Reza
The fundamental Gaussian TEM00 mode is the most common mode of propagation within various optical devices, modules, and systems. Beam profilers are widely used in accurately ascertaining the cross-sectional irradiance profile of a TEM00 mode for free-space optical communication systems as well as tracking beam evolution when propagating within optical submodules. We demonstrate beam profiling methods that use low-cost, off-the-shelf, widely available circular apertures such as circular irises and spatial filters...
February 1, 2019: Applied Optics
https://read.qxmd.com/read/30874121/high-efficiency-broadband-and-wide-angle-all-dielectric-quarter-wave-plate-based-on-anisotropic-electric-and-magnetic-dipole-resonances
#11
Jiaqi Yang, Tian Lan
Metadevices based on dielectric nanostructure with excitation of electric and magnetic resonances have shown high efficiency for polarization control compared with conventional manipulation methods, as well as plasmonic structure metadevices. Since both the electric and magnetic dipole (MD) resonances can be precisely adjusted by optimizing geometric parameters of the resonators to meet the desired wavelength, this paper proposes an approach to implement the high transmittance metadevices operating at preferred wavelengths...
February 1, 2019: Applied Optics
https://read.qxmd.com/read/30874115/plane-chessboard-based-calibration-method-for-a-lwir-ultra-wide-angle-camera
#12
Yichao Chen, Fu-Yu Huang, Feng-Ming Shi, Bing-Qi Liu, Hao Yu
A method is proposed to calibrate the long-wave infrared ultra-wide-angle camera in this paper. In addition, a novel calibration chessboard is designed and an advanced chessboard corner positioning method is adopted to improve the calibration precision. The designed calibration chessboard can achieve high thermal infrared contrast and exhibits outstanding stability, which is made of a thermoelectric semiconductor refrigeration device. The proposed subpixel corner positioning method can accurately locate the corners on the calibration chessboard according to the characteristics of the infrared image and the checkerboard pattern...
February 1, 2019: Applied Optics
https://read.qxmd.com/read/30873260/almarvi-execution-platform-heterogeneous-video-processing-soc-platform-on-fpga
#13
Joost Hoozemans, Jeroen van Straten, Timo Viitanen, Aleksi Tervo, Jiri Kadlec, Zaid Al-Ars
The proliferation of processing hardware alternatives allows developers to use various customized computing platforms to run their applications in an optimal way. However, porting application code on custom hardware requires a lot of development and porting effort. This paper describes a heterogeneous computational platform (the ALMARVI execution platform) comprising of multiple communicating processors that allow easy programmability through an interface to OpenCL. The ALMARVI platform uses processing elements based on both VLIW and Transport Triggered Architectures ( ρ -VEX and TCE cores, respectively)...
2019: Journal of Signal Processing Systems
https://read.qxmd.com/read/30872902/an-lca-of-the-pelamis-wave-energy-converter
#14
R Camilla Thomson, John P Chick, Gareth P Harrison
Purpose: To date, very few studies have attempted to quantify the environmental impacts of a wave energy converter, and almost all of these focus solely on the potential climate change impacts and embodied energy. This paper presents a full life cycle assessment (LCA) of the first-generation Pelamis wave energy converter, aiming to contribute to the body of published studies and examine any potential trade-offs or co-benefits across a broad range of environmental impacts. Methods: The process-based attributional LCA was carried out on the full cradle-to-grave life cycle of the Pelamis P1 wave energy converter, including the device, its moorings and sub-sea connecting cable up to the point of connection with the grid...
2019: International Journal of Life Cycle Assessment
https://read.qxmd.com/read/30871253/a-technological-review-of-wearable-cueing-devices-addressing-freezing-of-gait-in-parkinson-s-disease
#15
REVIEW
Dean Sweeney, Leo R Quinlan, Patrick Browne, Margaret Richardson, Pauline Meskell, Gearóid ÓLaighin
Freezing of gait is one of the most debilitating symptoms of Parkinson's disease and is an important contributor to falls, leading to it being a major cause of hospitalization and nursing home admissions. When the management of freezing episodes cannot be achieved through medication or surgery, non-pharmacological methods such as cueing have received attention in recent years. Novel cueing systems were developed over the last decade and have been evaluated predominantly in laboratory settings. However, to provide benefit to people with Parkinson's and improve their quality of life, these systems must have the potential to be used at home as a self-administer intervention...
March 13, 2019: Sensors
https://read.qxmd.com/read/30871160/improving-quality-of-service-in-cloud-fog-computing-through-efficient-resource-allocation
#16
Samson Busuyi Akintoye, Antoine Bagula
Recently, a massive migration of enterprise applications to the cloud has been recorded in the IT world. One of the challenges of cloud computing is Quality-of-Service management, which includes the adoption of appropriate methods for allocating cloud-user applications to virtual resources, and virtual resources to the physical resources. The effective allocation of resources in cloud data centers is also one of the vital optimization problems in cloud computing, particularly when the cloud service infrastructures are built by lightweight computing devices...
March 13, 2019: Sensors
https://read.qxmd.com/read/30871107/habitat-an-iot-solution-for-independent-elderly
#17
Elena Borelli, Giacomo Paolini, Francesco Antoniazzi, Marina Barbiroli, Francesca Benassi, Federico Chesani, Lorenzo Chiari, Massimiliano Fantini, Franco Fuschini, Andrea Galassi, Gian Andrea Giacobone, Silvia Imbesi, Melissa Licciardello, Daniela Loreti, Michele Marchi, Diego Masotti, Paola Mello, Sabato Mellone, Giuseppe Mincolelli, Carla Raffaelli, Luca Roffia, Tullio Salmon Cinotti, Carlo Tacconi, Paola Tamburini, Marco Zoli, Alessandra Costanzo
In this work, a flexible and extensive digital platform for Smart Homes is presented, exploiting the most advanced technologies of the Internet of Things, such as Radio Frequency Identification, wearable electronics, Wireless Sensor Networks, and Artificial Intelligence. Thus, the main novelty of the paper is the system-level description of the platform flexibility allowing the interoperability of different smart devices. This research was developed within the framework of the operative project HABITAT (Home Assistance Based on the Internet of Things for the Autonomy of Everybody), aiming at developing smart devices to support elderly people both in their own houses and in retirement homes, and embedding them in everyday life objects, thus reducing the expenses for healthcare due to the lower need for personal assistance, and providing a better life quality to the elderly users...
March 12, 2019: Sensors
https://read.qxmd.com/read/30870988/bluetooth-mesh-energy-consumption-a-model
#18
Seyed Mahdi Darroudi, Raül Caldera-Sànchez, Carles Gomez
The recent publication of the Bluetooth Mesh standard is a remarkable milestone in the evolution of Bluetooth Low Energy (BLE). As a new technology in the Internet of Things (IoT) market, it is crucial to investigate the performance of Bluetooth Mesh. However, while a fundamental feature of Bluetooth Mesh is its suitability for energy-constrained devices, this aspect has not yet been properly considered in the literature. In this paper, we model the current consumption, lifetime and energy cost per delivered bit of a battery-operated Bluetooth Mesh sensor node...
March 12, 2019: Sensors
https://read.qxmd.com/read/30870639/iridium-oxide-iv-nanoparticle-based-lateral-flow-immunoassay
#19
Daniel Quesada-González, Amadeo Sena-Torralba, Wiyogo Prio Wicaksono, Alfredo de la Escosura-Muñiz, Tribidasari A Ivandini, Arben Merkoçi
Lateral flow biosensors are paper-based devices that allow the detection of different types of analytes with quickness, robustness and selectivity, without leaving behind paper sensors benefits as low-cost, recyclability and sustainability. Nanomaterials have been widely reported in lateral flow biosensors, offering new sensing strategies based on optical or electrical detection techniques. Looking for other advantageous nanomaterials, we propose for the first time the use of iridium oxide (IV) nanoparticles in lateral flow assays for the detection of human immunoglobulin as a model protein...
February 28, 2019: Biosensors & Bioelectronics
https://read.qxmd.com/read/30869869/novel-wax-valves-to-improve-distance-based-analyte-detection-in-paper-microfluidics
#20
Chang Chen, Litao Zhao, Han Zhang, Xiaoshuang Shen, Yonggang Zhu, Huaying Chen
Microfluidic paper-based analytical devices (µPADs) have been extensively studied for disease diagnostics, food quality control and environmental monitoring due to the advantages of low cost, portability, and simplicity. The lack of flow con-trollability has triggered the development of valves for such devices. This paper reports the µPADs integrating novel wax valves for distance-based detection. The valves are printed on paper and can be manually opened by organic solvents within seconds. The opened valve does not influence the flow...
March 14, 2019: Analytical Chemistry
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