scholarly journals Eu3+-based dual-excitation single-emission luminescent ratiometric thermometry

2021 ◽  
Author(s):  
Yuanbo Yang ◽  
li leipeng ◽  
Hao Suo ◽  
Panlai Li ◽  
Zhijun Wang ◽  
...  
Keyword(s):  
Single Emission

scholarly journals Solution-Processed Efficient Blue Phosphorescent Organic Light-Emitting Diodes (PHOLEDs) Enabled by Hole-Transport Material Incorporated Single Emission Layer

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 554
Author(s):  
Taeshik Earmme
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Emission Layer ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Single Emission ◽  
Blue Phosphorescent

Solution-processed blue phosphorescent organic light-emitting diodes (PHOLEDs) based on a single emission layer with small-molecule hole-transport materials (HTMs) are demonstrated. Various HTMs have been readily incorporated by solution-processing to enhance hole-transport properties of the polymer-based emission layer. Poly(N-vinylcarbazole) (PVK)-based blue emission layer with iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C2′)picolinate (FIrpic) triplet emitter blended with solution-processed 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) gave luminous efficiency of 21.1 cd/A at a brightness of 6220 cd/m2 with an external quantum efficiency (EQE) of 10.6%. Blue PHOLEDs with solution-incorporated HTMs turned out to be 50% more efficient compared to the reference device without HTMs. The high hole mobility, high triplet energy of HTM, and favorable energy transfer between HTM blended PVK host and FIrpic blue dopant were found to be important factors for achieving high device performance. The results are instructive to design and/or select proper hole-transport materials in solution-processed single emission layer.

Coffee-Ring-Free Ultrasonic Spray Coating Single-Emission Layers for White Organic Light-Emitting Devices and Their Energy-Transfer Mechanism

2017 ◽  
Vol 1 (1) ◽  
pp. 103-112 ◽  
Author(s):  
Shihao Liu ◽  
Xiang Zhang ◽  
Maojun Yin ◽  
Haiwei Feng ◽  
Jiaxin Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Spray Coating ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Ultrasonic Spray ◽  
Organic Light ◽  
Coffee Ring ◽  
Single Emission

An echolocation model for the restoration of an acoustic image from a single-emission echo

2004 ◽  
Vol 116 (6) ◽  
pp. 3782-3788 ◽  
Author(s):  
Ikuo Matsuo ◽  
Masafumi Yano
Keyword(s):  
Acoustic Image ◽  
Single Emission

Stable field-emission from a CeB6 nanoneedle point electron source

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuai Tang ◽  
Jie Tang ◽  
Yimeng Wu ◽  
You-Hu Chen ◽  
Jun Uzuhashi ◽  
...  
Keyword(s):  
Field Emission ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Electron Source ◽  
Emission Current ◽  
Field Emission Current ◽  
Stable Field ◽  
Single Emission

A single CeB6 nanoneedle structure has been fabricated using a focused ion beam (FIB) and it shows an excellent field emission current stability as well as a single emission spot.

scholarly journals Broadband Generalized Sidelobe Canceler Beamforming Applied to Ultrasonic Imaging

2020 ◽  
Vol 10 (4) ◽  
pp. 1207
Author(s):  
Jiake Li ◽  
Zhe Ma ◽  
Lei Mao ◽  
Zhengjun Wang ◽  
Yi Wang ◽  
...  
Keyword(s):  
Near Field ◽  
Simulated Data ◽  
Noise Signal ◽  
Frame Rate ◽  
Synthetic Aperture ◽  
Lateral Resolution ◽  
Wavelet Domain ◽  
Sidelobe Level ◽  
Wave Emission ◽  
Single Emission

A broadband generalized sidelobe canceler (Broadband-GSC) application for near-field beamforming is proposed. This approach is implemented in the wavelet domain. Broadband-GSC provides a set of complex, adapted apodization weights for each wavelet subband. The proposed method constrains interference and noise signal to improve the lateral resolution with only one single emission. Performance of the proposed beamforming is tested on simulated data obtained with Field II. Experiments have proved that the new beamforming can significantly increase the image quality compared with delay-and-sum (DAS) and synthetic aperture (SA). Imaging of scattering points show that Broadband-GSC improves the lateral resolution by 43.2% and 58.0% compared with SA and DAS, respectively. Meanwhile，Broadband-GSC reduces the peak sidelobe level by 11.6 dB and 26.4 dB compared with SA and DAS, respectively. Plane wave emission experiment indicates that Broadband-GSC can improve the lateral resolution by 44.2% compared with DAS. Furthermore, the new beamforming introduces the possibility for higher frame-rate and higher investigation depth with increased lateral resolution.

One-pot fabrication of dual-emission and single-emission biomass carbon dots for Cu2+ and tetracycline sensing and multicolor cellular imaging

2020 ◽  
Vol 412 (27) ◽  
pp. 7481-7489
Author(s):  
Lihui Wu ◽  
Ruiqing Long ◽  
Te Li ◽  
Cui Tang ◽  
Xia Tong ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cellular Imaging ◽  
Biomass Carbon ◽  
One Pot ◽  
Dual Emission ◽  
Single Emission

Evaluation of performance of the echolocation model for the restoration of an acoustic image from a single‐emission echo

2006 ◽  
Vol 119 (5) ◽  
pp. 3317-3317
Author(s):  
Ikuo Matsuo ◽  
Takashi Magara ◽  
Masafumi Yano
Keyword(s):  
Acoustic Image ◽  
Evaluation Of Performance ◽  
Single Emission

scholarly journals Evaluation of Position Resolution for a Prototype Whole-Body PET Detector Based on Suppressing Backgrounds by Compton Scattering

2018 ◽  
Vol 170 ◽  
pp. 09004
Author(s):  
Kento FUJIHARA ◽  
Yusaku EMOTO ◽  
Hiroshi ITO ◽  
Naomi KANEKO ◽  
Hideyuki KANEKO ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Pure Water ◽  
High Growth ◽  
Whole Body ◽  
Bottom Surface ◽  
Measuring Instruments ◽  
Position Resolution ◽  
Prototype Detector ◽  
Single Emission ◽  
Scattering Events

Existing PET (Positron Emission Tomography) systems make clear images in demonstration (measuring small PET reagent in pure water), however images in real diagnosis become unclear. The authors suspected that this problem was caused by Compton scattering in a detector. When PET systems observe plural photomultiplier tube outputs, an original emission point is regarded as centroid of the outputs. However, even if plural emission in Compton scattering occur, these systems calculate original point in the same way as single emission. Therefore, the authors considered that rejecting Compton scattering events makes PET systems much better, and made prototype counter. Main components of the prototype counter are plate-like high-growth-rate (HGR) La-GPS scintillators and wavelength shifting fibers (WLSF). HGR crystals grow 10 times as fast as a mono-crystal (a normal mono-crystal grows at 2 – 3 mm an hour). Thus, it includes microbubble and its transparency get worth. Consequently, HGR crystals usually are not used in radiation measuring instruments. However, this time they are used on the purpose. Because of their low transparency, scintillation lights come out right above and right under of emission position. Therefore, Compton scattering events is rejected easily. The prototype detector has an effective area of 300 by 300 square mm. The detector consists of 24 layers. One layer consists of HGR La-GPS scintillator of 1 mm thickness. Top and bottom surface of scintillator were covered by dual sheets of WLSF with a diameter of 0.2 mm. Sheets of WLSF on top and bottom of the scintillator make a right angle with each other, and measure X- and Y-components. Z-component is measured by difference of WLSF outputs between top and bottom. If plural layers output signals, this counter regards the event as Compton scattering event, and reject the event. Even if only a layer output signals, the event is rejected when number output signals from WLSF is more than 1.5 times of single emission. Material cost of this system is, 0.2M$ for HGR La-GPS, 0.03M$ for WLSF, 0.03M$ for 600 units of 6 by 6 mm SiPM's, 0.12M$ for 12000 units of 1 by 1 mm SiPM's, and 0.09M$ for 1800 channel of signal readout circuits. Considering total cost, price of this PET will be set 1M$ or less. This idea was confirmed with numerical simulation and experimentation. In experimentation, position resolution in photoelectric absorption was 0.2 mm, and minimum distance that this detector could recognize plural emission in Compton scattering was 1 mm. In parallel, three kinds of model were made: a prototype detector, all the signals readout method, and resistance delay method. Simulation setting was 2 MBq/L in normal tissue and 10 MBq/L in cancer. As a result of simulation, a prototype detector identified 3 mm cancer, however the others made unclear image and was not able to identified cancer. That is to say, the prototype detector is able to reject Compton scattering events and inexpensive. Therefore, whole-body PET system with this detector must diagnose cancer with a diameter of 3 mm or more and be priced 1M$ or less

scholarly journals Physical Observations of the Short-Period Comet 1969 IV

1972 ◽  
Vol 45 ◽  
pp. 27-34
Author(s):  
K. I. Churyumov ◽  
S. I. Gerasimenko
Keyword(s):  
Spectral Region ◽  
Sunspot Area ◽  
Radius Vector ◽  
Short Period Comet ◽  
Short Period ◽  
Single Emission ◽  
The Continuum ◽  
Period Comet

The new short-period comet Churyumov-Gerasimenko, discovered by the authors on plates taken by the Kiev University cometary expedition to Alma-Ata in September 1969, was systematically photographed with fast telescopes at Byurakan and Alma-Ata until March 1970. Measurements were made of the photographic magnitude of the photometric nucleus, as well as of the photographic and photovisual integral magnitudes. The variations in nuclear magnitude were found to be well correlated with changes in the total sunspot area. The integral photometric parameters are Hy = 11.91±0m.54 and n=4.0±0.8 (in the photographic spectral region). Deviations of the tail axis from the prolonged radius vector were considerable. A spectrogram shows the continuum and emission of CN, C2 and C3 in the head, the continuum and a single emission (perhaps CO+) in the tail.

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