The proposed system for recognizing Myanmar sign language between individuals who are deaf. The aim of this study is to develop deep learning models for the purpose of accurately identifying dynamic hand gesture image...
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This paper is concerned with the dynamic coverage of multiple autonomous surface vehicles (ASVs) in the presence of static and dynamic obstacles, limited communication distance, and measurement noises. A modular contr...
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When the source domain and target domain differ in Signal-to-Noise Ratio (SNR), models trained on source data tend to perform poorly on target data. Given a labeled source dataset, unsupervised domain adaptation (UDA)...
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Buried interface defects pose a significant challenge to achieving high efficiency and stability of n-i-p perovskite solar cells(PSCs).A multifunctional material is essential for passivating interface defects,suppress...
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Buried interface defects pose a significant challenge to achieving high efficiency and stability of n-i-p perovskite solar cells(PSCs).A multifunctional material is essential for passivating interface defects,suppressing non-radiative recombination,and facilitating rapid carrier transfer at these ***,a new multifunctional eco-friendly small molecule,D-fructose,was introduced into the interface as a modification layer,playing a significant role in passivating defects not only among SnO_(2) quantum dots(QDs),but also between perovskite and SnO_(2) *** coordination bonds of the C=O group with Pb^(2+)and Sn^(4+)/Sn^(2+),along with the hydrogen bonds of the-OH group with I^(-)in perovskite,contribute to this passivation ***,this multifunctional collaboration at the buried interface not only triggers uniform heterogeneous nucleation across the perovskite precursor film,leading to high-quality perovskite,but also effectively eliminates residual PbI2 at grain boundaries to suppress perovskite *** a more suitable energy level alignment between perovskite and SnO_(2) QDs can smooth the interface barrier,thereby facilitating the formation of an electron bridge for rapid electron extraction and ***,the D-fructose based PSC has achieved a champion efficiency of 24.91%with negligible J-V hysteresis,along with excellent stability.
Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wire...
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Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wirelesscommunication, and security inspection. However, traditionalconductive EMI films typically achieve high shieldingeffectiveness through strong reflection, which may causesecondary pollution to other devices. Here, a gradientstructure strategy was proposed to constructTi_(3)C_(2)Tx/hydroxypropyl methyl cellulose (HPMC) film, in whichthe content of Ti_(3)C_(2)Tx gradually increases along the thicknessdirection, resulting in different conductivity of the two surfaces(surface-M and surface-H) for the film. The obtained gradientfilmexhibits an EMI shielding efficiency of over 48.5 dB in theTHz range (0.2-1.6 THz) at a thickness of 40 μm. Especially,as the THz waves incident from the surface-H to the film, the absorption effectiveness reaches 48.2 dB (average absorbedpower loss up to 91.4%), and the reflection effectiveness is only 0.3 dB. In additions, the gradient-film also demonstrates ahigh absorption rate of 95.5% in the infrared band (2.5-16.7 μm). Moreover, the gradient-film exhibits an excellent tensilestress and Young’s modulus value of 173.1 MPa and 2.8 GPa, respectively. Therefore, the gradient-film proposed in thiswork, with excellent electromagnetic absorption in both THz and infrared band, provides a promising candidate for the nextgenerationEMI shielding applications.
In recent years,there has been a surge of interest in higher-order topological phases(HOTPs)across various disciplines within the field of *** unique phases are characterized by their ability to harbor topological pro...
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In recent years,there has been a surge of interest in higher-order topological phases(HOTPs)across various disciplines within the field of *** unique phases are characterized by their ability to harbor topological protected boundary states at lower-dimensional boundaries,a distinguishing feature that sets them apart from conventional topological phases and is attributed to the higher-order bulk-boundary ***-dimensional(2D)twisted systems offer an optimal platform for investigating HOTPs,owing to their strong controllability and experimental ***,we provide a comprehensive overview of the latest research advancements on HOTPs in 2D twisted multilayer *** will mainly review the HOTPs in electronic,magnonic,acoustic,photonic and mechanical twisted systems,and finally provide a perspective of this topic.
The transient electromagnetic method (TEM) is widely used in geophysical exploration. In TEM data interpretation, nonlinear inversion plays an important role. However, traditional TEM nonlinear inversion adopts the OC...
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Intelligent reflecting surface(IRS)assisted with the wireless powered communication network(WPCN)can enhance the desired signal energy and carry out the power-sustaining problem in ocean monitoring *** this paper,we i...
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Intelligent reflecting surface(IRS)assisted with the wireless powered communication network(WPCN)can enhance the desired signal energy and carry out the power-sustaining problem in ocean monitoring *** this paper,we investigate a reliable communication structure where multiple buoys transmit data to a base station(BS)with the help of the unmanned aerial vehicle(UAV)-mounted IRS and harvest energy from the base station *** organically combine WPCN with maritime data collection scenario,a scheduling protocol that employs the time division multiple access(TDMA)is proposed to serve multiple buoys for uplink data ***,we compare the full-duplex(FD)and half-duplex(HD)mechanisms in the maritime data collection system to illustrate different performances under these two *** maximize the fair energy efficiency under the energy harvesting constraints,a joint optimization problem on user association,BS transmit power,UAV’s trajectory and IRS’s phase shift is *** solve the non-convex problem,the original problem is decoupled into several subproblems,and successive convex optimization and block coordinate descent(BCD)methods are employed obtain the near-optimal solutions *** results demonstrate that the UAV-mounted IRS can significantly improve energy efficiency in our considered system.
On-chip photonic neural networks (PNNs) have recently emerged as an attractive hardware accelerator for deep learning applications. However, deep PNNs with higher inference complexity are harder to train due to gradie...
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Dialect speech recognition has always been one of the challenges in Automatic Speech Recognition (ASR) systems. While lots of ASR systems perform well in Mandarin, their performance significantly drops when handling d...
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