Benzimidazole-triazine-based electron acceptor PIM-TRZ with high triplet exited-state energy and strong electron-transport ability was newly developed. A series of highly efficient exciplex emitters have been fabricated. The TAPC:PIM-TRZ (TAPC: di-[4-( N, N-ditoly amino)-phenyl]cyclohexane) film shows a photoluminescence (PL) quantum yields (PLQY, Φf) 93.4%, the device based on exhibits low turn-on voltage 2.3 V, maximum efficiency 71.2 cd A-1 (current efficiency, CE), 97.3 lm W-1 (power...

Abstract Pure organic room‐temperature phosphorescence (RTP) materials are considered as potential candidates for replacing precious metal complexes to fabricate highly efficient light‐emitting devices (OLEDs). However, applications of the reported RTP in OLEDs seriously impeded by their low photoluminescence quantum yields (PLQYs) a thin film state. To overcome these obstacles, we established new strategy construct based on pure material sensitized fluorescence emitter selecting...

A class of novel donor–acceptor orange-red to red thermally activated delayed fluorescence (TADF) emitters with a maximum external quantum efficiency (EQE) up 26.0% and extremely low roll-off have been designed synthesized.

Diagnosis of the aging stage oil-paper insulation is an important technical means for preventing failure equipment. This article proposes a Raman spectroscopy diagnostic model to assess status transformer oilpaper by analyzing spectra insulating oil. Oil-paper samples in different stages were obtained from electrical and thermal accelerated tests lab. The oil collected range 400 3000 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> ,...

The narrowband emission of multi-resonance thermally activated delayed fluorescence (MR-TADF) molecules is associated with the surrounding group dominated vibronic transitions.

In this article, a 3-D hybrid Maxwell's equations finite-difference time-domain (ME-FDTD)/wave equation-based finite-element (WE-FETD) method is proposed. This retains the nonconformal mesh and implicit–explicit time integration scheme. The WE-FETD region based on wave equation rather than curl equations. needs to store all electric fields in entire only magnetic interface, which can prominently reduce degrees of freedom (DoFs) save calculation time. ME-FDTD follows Yee's A spectral element...

Using tunnel boring machines to excavate high-strength intact rock masses is becoming more common. Due the interactions between disc cutters and rocks, abnormal wear of cutters, especially cutter chipping, has become a common phenomenon. Existing research mainly focused on normal without addressing cases. This study used consumption data project in China investigate abovementioned problem based field research. According failure patterns fracture surface characteristics, chipping were...

Increasing attention has been paid to the safety and efficiency of batteries due rapid development widespread use electric vehicles. Solid-state have advantages good safety, high energy density, strong cycle performance, are recognized as next generation power batteries. However, solid-state generate large stress changes volume change electrode materials during cycling, resulting in pulverization exfoliation active materials, fracture solid-electrolyte interface films, internal cracks solid...

Aimed at enhancing the effectiveness and efficiency for offshore project scheduling, mathematical model of two-stage scheduling is proposed according to characteristics discussed in this article, which used solve problem large-scale complex project. Regarding a system framework with multi-agent technology presented facilitate integration cooperation scheduling. Next, functional definition internal structure each intelligent agent designed. Moreover, two kinds algorithms have been designed...

Spin-forbidden excitation is an efficient way to obtain triplet excitons directly from the ground state of organic semiconductors. According perturbation theory under framework Fermi's golden rule, this process requires spin-orbit coupling (SOC) and transition dipole moment (TDM) be combined through intermediate that mixes initial final states. While previous research has focused mostly on enhancing SOC, little attention been paid engineering between SOC TDM in materials. In study, a series...

Abstract Pure organic room‐temperature phosphorescence (RTP) materials are considered as potential candidates for replacing precious metal complexes to fabricate highly efficient light‐emitting devices (OLEDs). However, applications of the reported RTP in OLEDs seriously impeded by their low photoluminescence quantum yields (PLQYs) a thin film state. To overcome these obstacles, we established new strategy construct based on pure material sensitized fluorescence emitter selecting...

When a fire occurs, it is first accompanied by heavy smoke features. In order to meet the real-time and accuracy requirements of detection, detection technology based on deep learning HSV color features proposed. Firstly, suspicious range roughly detected according feature video image, secondly, accurate performed Vision Transformer algorithm solve overfitting problem achieve accuracy. Experiments show that has high performance, fast speed, an rate 99.05%, which meets detection.

Thermal activation process utilizes environmental thermal energy to help supplement for the nonspontaneous energy‐consuming upconversion physical transitions with positive free change (ΔG &gt; 0). Reverse intersystem crossing (rISC) and hot band absorption are two kinds of transitions. Thermally activated delayed fluorescence (TADF) materials rISC have significantly propelled advancements in organic semiconductors. Hot absorption, enables anti‐Stokes photoluminescence, offering a promising...

Thermal activation process utilizes environmental thermal energy to help supplement for the nonspontaneous energy‐consuming upconversion physical transitions with positive free change (ΔG &gt; 0). Reverse intersystem crossing (rISC) and hot band absorption are two kinds of transitions. Thermally activated delayed fluorescence (TADF) materials rISC have significantly propelled advancements in organic semiconductors. Hot absorption, enables anti‐Stokes photoluminescence, offering a promising...

Abstract The π‐conjugation of molecules has a large influence on their excited state properties, especially for red thermally activated delayed fluorescence (TADF) materials. Two orange‐red TADF compounds comprising dual dicyano‐substituted pyrazine/quinoxaline acceptors have been designed and synthesized. TPA‐2DCNQ (3,3′‐((phenylazanediyl)bis(4,1‐phenylene))bis(2‐phenylquinoxaline‐6,7‐dicarbonitrile) with extended π‐conjugated quinoxaline as the acceptor exhibits higher photoluminescence...

This paper investigated the effect of particulate organic matter (POM) on sludge granulation under low load. The results showed that POM promoted formation aerobic granular (AGS) with a chemical oxygen demand (COD) fraction 25%, and also enhanced settleability biomass retention. However, when COD increased to 50% 75%, AGS performance deteriorated. analysis extracellular polymeric substances revealed (accounted for ≤50% in influent) suppressed secretion protein. microbial community indicated...

对地球磁层进行软X射线成像探测是近年来磁层研究的前沿方向.由二维X射线成像图重构三维磁层边界的方法研究是与成像探测相关的重要研究课题.传统的计算机断层成像技术(CT)重构方法在图像数据很少时无法得到较好的重构结果,甚至无法重构三维结构.考虑到地球磁层空间分布范围方面的约束,当前卫星任务的轨道设计很难满足扫描角度的全方位覆盖,只能从有限角度观测磁层,这给磁层的CT重构带来困难.作为三维重构研究的基础,本文考查简化的二维磁层结构重构方法,采用基于对抗神经网络的CT技术对简化的地球磁层边界结构进行重构.首先使用改进的生成式对抗网络(GAN)对有限角度的卫星扫描图像进行图像补全,进而使用代数迭代重建方法(ART)重构磁层.实验表明,当扫描角度大于90°时,生成式对抗网络能有效准确地补全缺失图像,重构效果较好.

In this paper, a new 3-D hybrid finite-difference time-domain (FDTD)/wave equation finite element (WE-FETD) method is proposed. Different from previous methods using first order Maxwell's curl equations, the FETD region in wave-equation-based. The forms FDTD/SETD/FETD framework. At interface of different region, it employs Discontinuous Galerkin to couple neighboring regions.

We introduce the fractional Laplacian on a subgraph of graph with Dirichlet boundary condition. For lattice graph, we prove upper and lower estimates for sum first $k$ eigenvalues Laplacian, extending classical results by Li-Yau Kr\"{o}ger.

The experiment focused the impact of increasing organic load rate (OLR) (0.6 kg COD·m-3·d-1 →1.2 COD·m-3·d-1) on development aerobic granular sludge (AGS) under low organotrophic conditions. During granulation process, characteristics and pollutant removal performance as OLR increased in reactor were better than that at OLR. However, strengthening effect varied different stages during granulation, indicating its stage disparity. In addition, increase changed extracellular polymeric...

The instability of blue emitters is one the shortcomings organic light-emitting diodes (OLEDs) in industrial applications. This intrinsically associated with basic transitions and reactions excited states. In this work, using framework Fermi's golden rule DFT/TDDFT, mechanisms a typical boron based multi-resonance thermally activated delayed fluorescence emitter involving states were investigated. A dynamic stability mechanism describing recycling between dissociation molecular structure T1...

Reconfigurable wheel-tracked system, which enables a vehicle to have the high speed of wheels and increased mobility tracks, is one key technologies on improving off-road performance vehicles in extreme environment. A series such systems has already been developed equipped robots medium or heavy ground vehicles. The paper reviews research work, prototype application reconfigurable systems. To start with, different are classified according their mechanical structures. Development current...

Pure organic room temperature phosphorescence (RTP) materials are considered as potential candidates for replacing precious metal-based complexes to fabricate highly efficient light emitting devices (OLEDs). However, reported RTP materials, low photoluminescence quantum yields (PLQYs) in thin film state seriously impede their applications OLEDs. On the other hand, how using normal fluorescence OLEDs with an internal efficiency (IQE) over 25% remains a great unaddressed issue beyond thermally...