The evaluation of effectiveness of space-based informationsystem (SIS) is of great significance for modern warfare in integrated operations. In view of characteristics of complex impact factors, small number of sampl...
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To reveal the fundamental aspects hidden behind various biological,chemical and physical phenomena,the capability of acquiring images with an ultrafast temporal resolution is indispensable and highly *** imaging frame...
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To reveal the fundamental aspects hidden behind various biological,chemical and physical phenomena,the capability of acquiring images with an ultrafast temporal resolution is indispensable and highly *** imaging frame rate of traditional CCD and CMOS imager usually only reaches sub-MHz,which is limited by the tradeoff between sensitivity and integration *** pump–probe scheme is widely applied in scientific imaging for its high-temporal resolution of pico-second ***,to film the events in chemical reactions,pump–probe combined with scanning tunneling microscopy(STM)or X-ray schemes are *** can take the snapshots with enhanced resolution to femtosecond for producing true molecular ***,it is only applicable for respective events,hence,falls short of capturing non-repetitive or destructive events,which count the majority in nature.
The intelligent warfare is coming with the development of new technologies, promoting the battlefield situation awareness with new features. In order to support the developing of artificial intelligent situation aware...
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Nuclearmagnetic resonance imaging of breasts often presents complex *** tumors exhibit varying sizes,uneven intensity,and indistinct *** characteristics can lead to challenges such as low accuracy and incorrect segmen...
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Nuclearmagnetic resonance imaging of breasts often presents complex *** tumors exhibit varying sizes,uneven intensity,and indistinct *** characteristics can lead to challenges such as low accuracy and incorrect segmentation during tumor ***,we propose a two-stage breast tumor segmentation method leveraging multi-scale features and boundary attention ***,the breast region of interest is extracted to isolate the breast area from surrounding tissues and ***,we devise a fusion network incorporatingmulti-scale features and boundary attentionmechanisms for breast tumor *** incorporate multi-scale parallel dilated convolution modules into the network,enhancing its capability to segment tumors of various sizes through multi-scale convolution and novel fusion ***,attention and boundary detection modules are included to augment the network’s capacity to locate tumors by capturing nonlocal dependencies in both spatial and channel ***,a hybrid loss function with boundary weight is employed to address sample class imbalance issues and enhance the network’s boundary maintenance capability through additional *** was evaluated using breast data from 207 patients at RuijinHospital,resulting in a 6.64%increase in Dice similarity coefficient compared to the *** results demonstrate the superiority of the method over other segmentation techniques,with fewer model parameters.
Perovskite-inspired materials (PIMs) are gaining increasing attention among emerging photovoltaic absorbers due to their inherent air stability and low-toxicity potential. However, operational stability, the Achilles&...
Perovskite-inspired materials (PIMs) are gaining increasing attention among emerging photovoltaic absorbers due to their inherent air stability and low-toxicity potential. However, operational stability, the Achilles' heel of all emerging photovoltaics, has been largely overlooked in PIMs research so far, making it difficult to forecast their practical use in real-world applications. In this work, we analyse the operational stability of a promising new PIM composition, CsMAFA-Sb:Bi, generated through the antimony : bismuth co-alloying of a triple cation vacancy-ordered antimony-based PIM. Through an in-depth theoretical and experimental investigation, we demonstrate that the co-alloying induces local structural changes that lead to enhanced microstructure, reduced trap-assisted recombination, and increased solar cell power conversion efficiency (PCE), with the highest value being 3.05%. Accelerated aging tests according to ISOS L-1 and L-2 protocols highlight the crucial role of co-alloying in enhancing stability. Specifically, maximum power point tracking at 85 °C shows a projected T80 lifetime of 275 hours for CsMAFA-Sb:Bi devices, which has never been achieved not only for any other PIM-based device but also for high-efficiency technologies, such as lead halide perovskite solar cells with similar device constituents. This work encourages future studies on PIM-based photovoltaics for their potential operational stability, with the goal of reducing the performance gap with established technologies.
This paper proposes a new method for measuring the complexity of software systems based on complex network theory. We first construct the complex network model for software system. Then, the complexity of a homogeneou...
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This paper presents a novel method to implement an interactive mobile robot. The proposed mobile robot is implemented under the technique of mixed reality. The mixed reality technique is realized by both the Virtools ...
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The evidential reasoning theory provides an important reasoning mechanism, and has been widely researched. However, the researches always focused on the combination for the same kind of beliefs. To solve the combinati...
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Herein,we focused on the development of the V_(4)C_(3) MXene composite bimetallic selenide heterostruc-ture(V_(4)C_(3)@CuSe_(2)/CoSe_(2))as a cathode material for aluminum *** heterostructure was pre-pared through a L...
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Herein,we focused on the development of the V_(4)C_(3) MXene composite bimetallic selenide heterostruc-ture(V_(4)C_(3)@CuSe_(2)/CoSe_(2))as a cathode material for aluminum *** heterostructure was pre-pared through a Lewis melt salt etching and selenization *** capitalizing on the synergistic effect between the bimetallic selenide and V_(4)C_(3) MXene,V_(4)C_(3)@CuSe_(2)/CoSe_(2) exhibited rapid charge transfer and demonstrated superior discharge specific capacity compared to V_(4)C_(3) composite monometallic ***,the incorporation of V_(4)C_(3) improved the material's stability during charging/*** initial discharge specific capacity of V_(4)C_(3)@CuSe_(2)/CoSe_(2) reached an impressive 809 mAh g^(-1) at 1 Ag^(-1).Even after nearly 3000 cycles,it retained a substantial capacity of 169.1 mAh g^(-1).Ex-situ XPS analysis confirmed the reversible valence transitions of Cu,Co,and Se elements as the main energy storage reac-tions taking place in the cathode *** functional theory analysis provided further insights,revealing that the strong metallic behavior of the heterostructure stemmed from the charge rearrange-ment facilitated by the bimetallic selenide structure and the optimization of the energy level ***,the presence of the bimetallic selenide structure significantly improved the adsorption ef-ficiency of[AlCl4]^(-).Overall,this research contributes to the advancement of rechargeable aluminum ion batteries and presents a promising avenue for future developments in composite metal selenide struc-tures and MXene-based materials.
In this paper, the problem of the Super-twisting sliding mode control(ST-SMC) is concerned for the pitch control system of a remotely operated vehicle(ROV). A novel kinetic model of ROV's pitch motion is establish...
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ISBN:
(纸本)9781509009107
In this paper, the problem of the Super-twisting sliding mode control(ST-SMC) is concerned for the pitch control system of a remotely operated vehicle(ROV). A novel kinetic model of ROV's pitch motion is established by using stress analysis. The purpose of the addressed pitch control problem is to design a Super-twisting sliding mode controller to drive the state of the pitch angle control system for a remotely operated vehicle to the desired value. A sliding surface is firstly constructed and an ST-SMC law is synthesized to ensure the reaching condition. Moreover, the total control condition is also given out to make the effect of the controller better. Then, by using the Lyapunov stability theory, the stability of the addressed pitch control problem is guaranteed. A simulation example is given to illustrate the effectiveness of the proposed design scheme.
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