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https://www.readbyqxmd.com/read/28227669/green-lasers-are-beyond-power-limits-mandated-by-safety-standards
#1
M H Lee, K Fox, S Goldwasser, D W M Lau, B Aliahmad, M Sarossy, M H Lee, K Fox, S Goldwasser, D W M Lau, B Aliahmad, M Sarossy, B Aliahmad, M H Lee, K Fox, D W M Lau, M Sarossy, S Goldwasser
There has been an increasing number of reports of people losing vision from laser exposure from pocket laser pointers despite the safety limit of 1 milliwatt (1mW) imposed by the Australian government. We hypothesize that this is because commercially available red and green laser pointers are exceeding their labeled power outputs. We tested the power outputs of 4 red and 4 green lasers which were purchased for less than AUD$30 each. The average of 10 measurements was recorded for each laser. We found that 3 out of 4 red lasers conformed to the 1mW safety standard; in contrast, all of the green lasers exceeded this limit, with one of the lasers recording an output of 127...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227507/efficient-assembly-of-multi-color-fiberless-optoelectrodes-with-on-board-light-sources-for-neural-stimulation-and-recording
#2
K Kampasi, J Seymour, E Stark, G Buzsaki, K D Wise, E Yoon, K Kampasi, J Seymour, E Stark, G Buzsaki, K D Wise, E Yoon, E Yoon, K Kampasi, J Seymour, G Buzsaki, E Stark, K D Wise
Fiberless optoelectrodes are an emerging tool to enable brain circuit mapping by providing precise optical modulation and electrical monitoring of many neurons. While optoelectrodes having an on-board light source offer compact and optically efficient device solutions, many of them fail to provide robust thermal and electrical design to fully exploit the recording capabilities of the device. In this work, we present a novel fiberless multicolor optoelectrode solution, which meets the optical and thermal design requirements of an in vivo neural optoelectrode and offers potential for low-noise neural recording...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227495/vibrocv-a-computer-vision-based-vibroarthrography-platform-with-possible-application-to-juvenile-idiopathic-arthritis
#3
Andrew D Wiens, Sampath Prahalad, Omer T Inan, Andrew D Wiens, Sampath Prahalad, Omer T Inan, Andrew D Wiens, Omer T Inan, Sarnpath Prahalad
Vibroarthrography, a method for interpreting the sounds emitted by a knee during movement, has been studied for several joint disorders since 1902. However, to our knowledge, the usefulness of this method for management of Juvenile Idiopathic Arthritis (JIA) has not been investigated. To study joint sounds as a possible new biomarker for pediatric cases of JIA we designed and built VibroCV, a platform to capture vibroarthrograms from four accelerometers; electromyograms (EMG) and inertial measurements from four wireless EMG modules; and joint angles from two Sony Eye cameras and six light-emitting diodes with commercially-available off-the-shelf parts and computer vision via OpenCV...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227150/integration-of-optical-and-electrochemical-sensors-on-a-microfluidic-platform-using-organic-optoelectronic-components-and-silver-nanowires
#4
Sujittra Poorahong, Florent Lefevre, Marie-Claude Perron, Philippe Juneau, Ricardo Izquierdo, Sujittra Poorahong, Florent Lefevre, Marie-Claude Perron, Philippe Juneau, Ricardo Izquierdo, Sujittra Poorahong, Ricardo Izquierdo, Florent Lefevre, Philippe Juneau, Marie-Claude Perron
Since the emergence of microfluidic platforms sensors integration has been a major challenge. With the advances in miniaturization of these platforms, there is a need for solutions to integrate various optical components in order to build sensors, which will offer different detection characteristics such as several emission and sensing wavelengths. Moreover, the integration of an electrochemical sensor including a transparent electrode that will be compatible with the optical sensor represents an additional challenge...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226914/sticker-type-ecg-ppg-concurrent-monitoring-system-hybrid-integration-of-cmos-soc-and-organic-sensor-device
#5
Yongsu Lee, Hyeonwoo Lee, Seunghyup Yoo, Hoi-Jun Yoo, Yongsu Lee, Hyeonwoo Lee, Seunghyup Yoo, Hoi-Jun Yoo, Seunghyup Yoo, Yongsu Lee, Hoi-Jun Yoo, Hyeonwoo Lee
The sticker-type sensor system is proposed targeting ECG/PPG concurrent monitoring for cardiovascular diseases. The stickers are composed of two types: Hub and Sensor-node (SN) sticker. Low-power CMOS SoC for measuring ECG and PPG signal is hybrid integrated with organic light emitting diodes (OLEDs) and organic photo detector (OPD). The sticker has only 2g weight and only consumes 141μW. The optical calibration loop is adopted for maintaining SNR of PPG signal higher than 30dB. The pulse arrival time (PAT) and SpO2 value can be extracted from various body parts and verified comparing with the reference device from 20 people in-vivo experiments...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225028/stacking-multiple-connecting-functional-materials-in-tandem-organic-light-emitting-diodes
#6
Tao Zhang, Deng-Ke Wang, Nan Jiang, Zheng-Hong Lu
Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge generation and charge injection. For a tandem organic light-emitting diode (OLED) with a simple Liq/Al/MoO3 stack, we discovered that there is a significant current lateral spreading causing light emission over an extremely large area outside the OLED pixel when the Al thickness exceeds 2 nm...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224123/model-based-pat-for-quality-management-in-pharmaceuticals-freeze-drying-state-of-the-art
#7
REVIEW
Davide Fissore
Model-based process analytical technologies can be used for the in-line control and optimization of a pharmaceuticals freeze-drying process, as well as for the off-line design of the process, i.e., the identification of the optimal operating conditions. This paper aims at presenting the state of the art in this field, focusing, particularly, on three groups of systems, namely, those based on the temperature measurement (i.e., the soft sensor), on the chamber pressure measurement (i.e., the systems based on the test of pressure rise and of pressure decrease), and on the sublimation flux estimate (i...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28222599/petal-inspired-diffractive-grating-on-a-wavy-surface-deterministic-fabrications-and-applications-to-colorizations-and-led-devices
#8
Kyung Jin Park, Jae Hoon Park, Ji-Hyeok Huh, Chan Ho Kim, Dong Hae Ho, Gwan H Choi, Pil J Yoo, Sung Min Cho, Jeong Ho Cho, Seungwoo Lee
Interestingly, the petals of flowering plants display unique hierarchical structures, in which surface relief gratings (SRGs) are conformably coated on a curved surface with a large radius of curvature (hereafter referred to as wavy surface). However, systematic studies on the interplay between the diffractive modes and the wavy surface have not yet been reported, due to the absence of deterministic nanofabrication methods capable of generating combinatorially diverse SRGs on a wavy surface. Here, by taking advantage of the recently developed nanofabrication composed of evaporative assembly and photofluidic holography inscription, we were able to achieve (i) combinatorially diverse petal-inspired SRGs with controlled curvatures, periodicities, and dimensionalities, and (ii) systematic optical studies of the relevant diffraction modes...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221990/an-integrated-circuit-for-simultaneous-extracellular-electrophysiology-recording-and-optogenetic-neural-manipulation
#9
Chang Hao Chen, Elizabeth A McCullagh, Sio Hang Pun, Peng Un Mak, Mang I Vai, Pui In Mak, Achim Klug, Tim C Lei
OBJECTIVE: The ability to record and to control action potential firing in neuronal circuits is critical to understand how the brain functions. The objective of this study is to develop a monolithic integrated circuit (IC) to record action potentials and simultaneously control action potential firing using optogenetics. METHODS: A low-noise and high input impedance (or low input capacitance) neural recording amplifier is combined with a high current laser/light-emitting diode (LED) driver in a single IC...
March 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28221904/reduction-of-bacterial-pathogens-and-potential-surrogates-on-the-surface-of-almonds-using-high-intensity-405-nanometer-light
#10
Alison Lacombe, Brendan A Niemira, Joseph Sites, Glenn Boyd, Joshua B Gurtler, Breanna Tyrell, Melissa Fleck
The disinfecting properties of high-intensity monochromatic blue light (MBL) were investigated against Escherichia coli O157:H7, Salmonella , and nonpathogenic bacteria inoculated onto the surface of almonds. MBL was generated from an array of narrow-band 405-nm light-emitting diodes. Almonds were inoculated with higher or lower levels (8 or 5 CFU/g) of pathogenic E. coli O157:H7 and Salmonella , as well as nonpathogenic E. coli K-12 and an avirulent strain of Salmonella Typhimurium, for evaluation as potential surrogates for their respective pathogens...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221029/highly-efficient-and-thermally-stable-k3alf6-mn4-as-a-red-phosphor-for-ultra-high-performance-warm-white-leds
#11
Enhai Song, Jianqing Wang, Jiahao Shi, Tingting Deng, Shi Ye, Mingying Peng, Jing Wang, Lothar Wondraczek, Qinyuan Zhang
Following pioneering work, solution-processable Mn4+-activated fluoride pigments, such as A2BF6 (A = Na, K, Rb, Cs; A2 = Ba, Zn; B = Si, Ge, Ti, Zr, Sn), have attracted considerable attention as highly promising red phosphors for warm white light emitting diodes (W-LEDs). To date, these fluoride pigments have been synthesized via traditional chemical routes with HF-solution. However, in addition to the possible dangers of hypertoxic HF, the uncontrolled precipitation of fluorides and the extensive processing steps produce large morphological variations, resulting in a wide variation in the LED performance of the resulting devices, which hampers their prospects for practical applications...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28220661/tunable-luminescence-and-energy-transfer-in-ca3-sio4-cl2-ce-3-li-mn-2-eu-2-phosphors
#12
Xiangqi Li, Xiuzhen Xie, Haiting Wei, Minzhen Zhong
A series of color-tunable Ca3-2x-y-z SiO4 Cl2 (CSC):xCe(3+) ,xLi(+) ,yMn(2+) ,zEu(2+) phosphors with low temperature phase structure was synthesized via the sol-gel method. An energy transfer process from Ce(3+) to Mn(2+) in CSC:0.01Ce(3+) ,0.01Li(+) ,yMn(2+) (y = 0.03-0.09) and the mechanism was verified to be an electric dipole-dipole interaction. The Ce(3+) and Mn(2+) emission intensities were greatly enhanced by co-doping Eu(2+) ions into CSC:0.01Ce(3+) ,0.01Li(+) ,0.07Mn(2+) phosphors due to competitive energy transfers from Eu(2+) /Ce(3+) to Mn(2+) , and Ce(3+) to Eu(2+) ...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28218704/an-easy-approach-to-control-%C3%AE-phase-formation-in-pfo-films-for-optimized-emission-properties
#13
Qi Zhang, Lang Chi, Gang Hai, Yueting Fang, Xiangchun Li, Ruidong Xia, Wei Huang, Erdan Gu
We demonstrate a novel approach to control β-phase content generated in poly(9,9-dioctylfluorene) (PFO) films. A very small amount of paraffin oil was used as the additive to the PFO solution in toluene. The β-phase fraction in the spin-coated PFO films can be modified from 0% to 20% simply by changing the volume percentage of paraffin oil in the mixed solution. Organic light emitting diodes (OLEDs) and amplified spontaneous emission (ASE) study confirmed low β-phase fraction promise better OLEDs device, while high β-phase fraction benefits ASE performance...
February 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28218516/coumarin-based-thermally-activated-delayed-fluorescence-emitters-with-high-external-quantum-efficiency-and-low-efficiency-roll-off-in-the-devices
#14
Jia-Xiong Chen, Wei Liu, Cai-Jun Zheng, Kai Wang, Ke Liang, Yizhong Shi, Xue-Mei Ou, Xiao-Hong Zhang
Thermally activated delayed fluorescence (TADF) emitters have attracted much interest for their great applications in organic light emitting diodes (OLEDs), but the TADF OLEDs are limited by large efficiency roll-offs. In this study, we report two coumarin-based TADF emitters, 3-methyl-6-(10H-phenoxazin-10-yl)-1H-isochromen-1-one (PHzMCO) and 9-(10H-phenoxazin-10-yl)-6H-benzo[c]chromen-6-one (PHzBCO), with relatively high photoluminescence quantum yields (PLQYs) and extremely small singlet-triplet splittings...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28218246/organic-organic-heterointerface-engineering-to-boost-carrier-injection-in-oleds
#15
Mohammadreza Fathollahi, Mohsen Ameri, Ezeddin Mohajerani, Ebrahim Mehrparvar, Mohammadrasoul Babaei
We investigate dynamic formation of nanosheet charge accumulations by heterointerface engineering in double injection layer (DIL) based organic light emitting diodes (OLEDs). Our experimental results show that the device performance is considerably improved for the DIL device as the result of heterointerface injection layer (HIIL) formation, in comparison to reference devices, namely, the current density is doubled and even quadrupled and the turn-on voltage is favorably halved, to 3.7 V, which is promising for simple small-molecule OLEDs...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28218244/transformation-from-slip-to-plastic-flow-deformation-mechanism-during-tensile-deformation-of-zirconium-nanocontacts
#16
Kohei Yamada, Tokushi Kizuka
Various types of nanometer-sized structures have been applied to advanced functional and structural devices. Inherent structures, thermal stability, and properties of such nanostructures are emphasized when their size is decreased to several nanometers, especially, to several atoms. In this study, we observed the atomistic tensile deformation process of zirconium nanocontacts, which are typical nanostructures used in connection of nanometer-sized wires, transistors, and diodes, memory devices, and sensors, by in situ transmission electron microscopy...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28217915/fast-and-simultaneous-determination-of-12-polyphenols-in-apple-peel-and-pulp-by-using-chemometrics-assisted-high-performance-liquid-chromatography-with-diode-array-detection
#17
Tong Wang, Hai-Long Wu, Li-Xia Xie, Li Zhu, Zhi Liu, Xiao-Dong Sun, Rong Xiao, Ru-Qin Yu
In this work, a smart chemometrics-enhanced strategy, high-performance liquid chromatography and diode array detection coupled with second-order calibration method based on alternating trilinear decomposition algorithm was proposed to simultaneously quantify 12 polyphenols in different kinds of apple peel and pulp samples. The proposed strategy proved to be a powerful tool to solve the problems of co-elution, unknown interferences and chromatographic shifts in the process of high-performance liquid chromatography analysis, making it possible for the determination of 12 polyphenols in complex apple matrices within 10 min under simple conditions of elution...
February 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28217560/core-shell-in-liquid-chromatography-application-for-determining-sulphonamides-in-feed-and-meat-using-conventional-chromatographic-systems
#18
Antonio Armentano, Simona Summa, Sonia Lo Magro, Pasquale D'Antini, Carmen Palermo, Marilena Muscarella
A C18 column packed with core-shell particles was used for the chromatographic separation of sulphonamides in feed and meat by a conventional high performance liquid chromatography system coupled with a diode array detector. Two analytical methods, already used in our laboratory, have been modified without any changes in the extraction and clean-up steps and in the liquid chromatography instrumentation. Chromatographic conditions applied on a traditional 5-µm column have been optimized on a column packed with 2...
September 20, 2016: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28216906/quality-by-design-multivariate-model-for-multicomponent-quantification-in-refining-process-of-honey
#19
Xiaoying Li, Zhisheng Wu, Xin Feng, Shanshan Liu, Xiaojie Yu, Qun Ma, Yanjiang Qiao
OBJECTIVE: A method for rapid analysis of the refining process of honey was developed based on near-infrared (NIR) spectroscopy. METHODS: Partial least square calibration models were built for the four components after the selection of the optimal spectral pretreatment method and latent factors. RESULTS: The models covered the samples of different temperatures and time points, therefore the models were robust and universal. CONCLUSIONS: These results highlighted that the NIR technology could extract the information of critical process and provide essential process knowledge of the honey refining process...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28216897/high-performance-liquid-chromatography-diode-array-detector-method-for-the-simultaneous-determination-of-five-compounds-in-the-pulp-and-seed-of-sea-buckthorn
#20
Lu Zhao, E Wen, Halmuart Upur, Shuge Tian
CONTEXT: Sea buckthorn (Hippophae rhamnoides L.) as a traditional Chinese medicinal plant has various uses in Xinjiang. OBJECTIVE: A reversed-phase rapid-resolution liquid-chromatography method with diode array detector was developed for simultaneous determination of protocatechuic acid, rutin, quercetin, kaempferol, and isorhamnetin in the pulp and seed of sea buckthorn, a widely used traditional Chinese medicine for promoting metabolism and treating scurvy and other diseases...
January 2017: Pharmacognosy Magazine
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