Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differential phase contrast ***-phase grating interferometers have been relatively completely studied and *** ...
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Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differential phase contrast ***-phase grating interferometers have been relatively completely studied and *** this paper,the corresponding imaging fringe formula of the three-phase grating interferometer is *** the same time,the similarities and differences between the three-phase grating interferometer and the dual-phase grating interferometer are investigated and verified,and that the three-phase grating interferometer can produce large-period moiréfringes without using the analyzing grating is demonstrated ***,a simple method of designing three-phase grating and multi-grating imaging systems from geometric optics based on the thin-lens theory of gratings is *** theoretical formulas and experimental results provide optimization tools for designing three-phase grating interferometer systems.
Altermagnetism has been proposed as a new type of magnetism, simultaneously exhibiting compensated spin moments in real space and spin-split electronic bands in reciprocal space. Alternating chiral magnon splitting is...
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A bifacial modification technique has been developed to improve the device performance of the perovskite light-emitting diodes (PeLEDs). For the bottom modification, to reduce the acidity of the hole injection layer (...
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A new type of simple emissive organic cage consisting of diphenyl sulfone units and nitrogen atoms was developed via one-pot C–N coupling condensation or two-step reactions along with a series of sulfoxide cages obta...
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A new type of simple emissive organic cage consisting of diphenyl sulfone units and nitrogen atoms was developed via one-pot C–N coupling condensation or two-step reactions along with a series of sulfoxide cages obtained, which exhibited excellent chemical modifiability and structural stability. By precisely controlling the participation of donor and acceptor units, a highly soluble organic cage with delayed fluorescence was obtained for the first time. More interestingly, due to the restriction of intramolecular flipping by locking the building blocks within a rigid framework, this emissive organic cage further showed narrowband ultra-deep blue electroluminescence emission at 413 nm with a full-width at half-maximum of 35 nm. This finding not only expands the family of electroluminescent organic cages, but also opens up a new platform for delayed fluorescence materials with high solubility and color purity.
Multiple light scattering is considered as the major limitation for deep imaging and focusing in turbid *** this paper,we present an innovative method to overcome this limitation and enhance the delivery of light ener...
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Multiple light scattering is considered as the major limitation for deep imaging and focusing in turbid *** this paper,we present an innovative method to overcome this limitation and enhance the delivery of light energy ultradeep into turbid media with significant improvement in *** method is based on a wide-field reflection matrix optical coherence tomography(RM-OCT).The time-reversal decomposition of the RM is calibrated with the Tikhonov regularization parameter in order to get more accurate reversal results deep inside the scattering *** propose a concept named model energy matrix,which provides a direct mapping of light energy distribution inside the scattering *** the best of our knowledge,it is the first time that a method to measure and quantify the distribution of beam intensity inside a scattering sample is *** employing the inversion of RM to find the matched wavefront and shaping with a phase-only spatial light modulator,we succeeded in both focusing a beam deep(~9.6 times of scattering mean free path,SMFP)inside the sample and increasing the delivery of light energy by an order of magnitude at an ultra-deep(~14.4 SMFP)*** technique provides a powerful tool to understand the propagation of photon in a scattering medium and opens a new way to focus light inside biological tissues.
The accurate assessment of two-phase flow in high-temperature gas-cooled reactors (HTGRs) is crucial for nuclear safety and operational efficiency. Void fraction, a key parameter for evaluating two-phase flow and core...
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In the recent decade,single-shot ultrafast optical imaging by active detection,called single-shot active ultrafast optical imaging(SS-AUOI)here,has made great progress,e.g.,with a temporal resolution of 50 fs and a fr...
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In the recent decade,single-shot ultrafast optical imaging by active detection,called single-shot active ultrafast optical imaging(SS-AUOI)here,has made great progress,e.g.,with a temporal resolution of 50 fs and a frame rate beyond 10 trillion frames per ***,it has become indispensable for charactering the nonrepeatable and difficult-to-reproduce events and revealing the underlying physical,chemical,and biological *** the basis of this delightful status,we would like to make a review of *** the basis of a brief introduction of SS-AUOI,our review starts with discussing its characteristics and then focuses on the survey and prospect of SS-AUOI technology.
As demonstrated during the COVID-19 pandemic,advanced deep ultraviolet(DUV)light sources(200–280 nm),such as AlGaN-based light-emitting diodes(LEDs)show excellence in preventing virus transmission,which further revea...
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As demonstrated during the COVID-19 pandemic,advanced deep ultraviolet(DUV)light sources(200–280 nm),such as AlGaN-based light-emitting diodes(LEDs)show excellence in preventing virus transmission,which further reveals their wide applications from biological,environmental,industrial to ***,the relatively low external quantum efficiencies(mostly lower than 10%)strongly restrict their wider or even potential applications,which have been known related to the intrinsic properties of high Al-content AlGaN semiconductor materials and especially their quantum ***,we review recent progress in the development of novel concepts and techniques in AlGaNbased LEDs and summarize the multiple physical fields as a toolkit for effectively controlling and tailoring the crucial properties of nitride quantum *** addition,we describe the key challenges for further increasing the efficiency of DUV LEDs and provide an outlook for future developments.
With the development of underwater vehicle technology,the application of underwater target detection ranges from ocean search,rescue and detection to fishing for marine *** this stage,the main problem for seafood dete...
With the development of underwater vehicle technology,the application of underwater target detection ranges from ocean search,rescue and detection to fishing for marine *** this stage,the main problem for seafood detection is the slow detection processing time caused by a large number of parameter calculations in deep learning *** paper proposes a lightweight underwater target detection network based on YOLOv5 ***,GhostBottleneck is used to reduce the network ***,a convolution block attention mechanism is added to the last layer of the backbone network to increase the weight of the valuable features while suppressing invalid features to improve detection ***,GIoUMS in YOLOv5 s replaces DIoUMS,which enhances the detection accuracy of the network for clustered overlapping *** results show that the lightweight network parameters and floating point calculation are 36.1 1% and 43.63% less than those of YOLOv5 s,the FPS is 109.12,and the detection accuracy is increased by 1.53%.Fast and efficient detection considerably improves the efficiency of underwater seafood detection.
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