All-solid-state supercapacitors with high power density and working stability are high-efficiency energy storage devices for smart electronic equipment. Developing electrode materials with fast ions and electrons tran...
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All-solid-state supercapacitors with high power density and working stability are high-efficiency energy storage devices for smart electronic equipment. Developing electrode materials with fast ions and electrons transport is critical to improving the energy storage capability. Here, we report carbon nanotubes/graphitic carbon nitride nanocomposites with large specific surface area, porous structure and high electrical conductivity toward high-performance supercapacitors. The large surface area with porosity provides reservoir for ion accommodation during charge-discharge processes, and the high conductivity facilitates electrons and ions transport. Furthermore, nitrogen sites in electrodes contribute significant pseudocapacitance for supercapacitors. The nanocomposites based device gives a high specific capacity of 148 F g^(–1) at current density of 1 A g^(–1) with good rate capability from 1 to 10 A g^(–1). Additionally, the device displays excellent working stability with capacitance retention of 93%even after 10000 cycles at 1 A g^(–1) under 0.8 V in air. This study sheds light on design of nanocomposites with highly efficient charge transfer and will accelerate development of next-generation solid state energy devices.
In this paper, we study the unconditional uniqueness of solution for the Cauchy problem of H^·^Sc(0≤Sc〈2) critical nonlinear fourth-order Schrodinger equations iδtu+Δ^2u-εu=λ|u|^α*** employing paraproduct...
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In this paper, we study the unconditional uniqueness of solution for the Cauchy problem of H^·^Sc(0≤Sc〈2) critical nonlinear fourth-order Schrodinger equations iδtu+Δ^2u-εu=λ|u|^α*** employing paraproduct estimates and Strichartz estimates, we prove that unconditional uniqueness of solution holds in Ct(I;H^·^Sc(R^d)))for d≥11 and min {1^-,8/d-4}≥a〉-(d-4)+√(d-4)^2+64/4.
The recently proposed ambient signal-based load modeling approach offers an important and effective idea to study the time-varying and distributed characteristics of power ***,it also brings new *** the load model par...
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The recently proposed ambient signal-based load modeling approach offers an important and effective idea to study the time-varying and distributed characteristics of power ***,it also brings new *** the load model parameters of power loads can be obtained in real-time for each load bus,the numerous identified parameters make parameter application *** order to obtain the parameters suitable for off-line applications,load model parameter selection(LMPS)is first introduced in this ***,the convolution neural network(CNN)is adopted to achieve the selection purpose from the perspective of short-term voltage *** begin with,the field phasor measurement unit(PMU)data from China Southern Power Grid are obtained for load model parameter identification,and the identification results of different substations during different times indicate the necessity of ***,the simulation case of Guangdong Power Grid shows the process of LMPS,and the results from the CNNbased LMPS confirm its effectiveness.
With the rapid development of semiconductor in- dustry, the number of cores integrated on chip increases quickly, which brings tough challenges such as bandwidth, scalability and power into on-chip interconnection. Un...
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With the rapid development of semiconductor in- dustry, the number of cores integrated on chip increases quickly, which brings tough challenges such as bandwidth, scalability and power into on-chip interconnection. Under such background, Network-on-Chip (NoC) is proposed and gradually replacing the traditional on-chip interconnections such as sharing bus and crossbar. For the convenience of physical layout, mesh is the most used topology in NoC design. Routing algorithm, which decides the paths of pack- ets, has significant impact on the latency and throughput of network. Thus routing algorithm plays a vital role in a wellperformed network. This study mainly :focuses on the routing algorithms of mesh NoC. By whether taking network information into consideration in routing decision, routing algorithms of NoC can be roughly classified into oblivious routing and adaptive routing. Oblivious routing costs less without adaptiveness while adaptive routing is on the contrary. To combine the advantages of oblivious and adaptive routing algorithm, half-adaptive algorithms were proposed. In this paper, the concepts, taxonomy and features of routing algorithms of NoC are introduced. Then the importance of routing algorithms in mesh NoC is highlighted, and representative routing algorithms with respective features are reviewed and summarized. Finally, we try to shed light upon the future work of NoC routing algorithms.
Hydrogen production by photoelectrochemical(PEC) water splitting converts the inexhaustible supply of solar radiation to storable H2 as clean energy and thus has received widespread *** efficiency of PEC water splitti...
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Hydrogen production by photoelectrochemical(PEC) water splitting converts the inexhaustible supply of solar radiation to storable H2 as clean energy and thus has received widespread *** efficiency of PEC water splitting is largely determined by the properties of the ***-dimensional(2 D) layered transition metal dichalcogenides(TMDs) are promising candidates for photoelectrodes due to their atomic layer thickness,tunable bandgap,large specific surface area,and high carrier ***,the construction of 2 D TMDs heterostructures provides freedom in material design,which facilitates the further improvement of PEC water *** review begins by describing the mechanism of PEC water splitting and the advantages of 2 D TMDbased heterostructures for photo ***,the design considerations of the heterostructures for enhanced PEC efficiency are comprehensively reviewed with a focus on material selection,band engineering,surface modification,and long-term ***,current challenges and future perspectives for the development of photoelectrodes based on 2 D TMDs heterostructures are addressed.
Triggered by global water quality safety issues,the research on wastewater treatment and water purification technology has been greatly developed in recent *** Fenton technology is particularly powerful due to the rap...
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Triggered by global water quality safety issues,the research on wastewater treatment and water purification technology has been greatly developed in recent *** Fenton technology is particularly powerful due to the rapid attack on pollutants by the generated hydroxyl radicals(·OH).However,both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reaction mechanism,which depends on the oxidation and reduction of the transition metal ions at single *** even after a century of development,this reaction still suffers from its inherent bottlenecks in practical *** recent years,our group has been focusing on studying a novel heterogeneous Fenton catalytic process,and we developed the dual-reaction-center(DRC)system for the first *** the DRC system,H2O2 and O2 can be efficiently reduced to reactive oxygen species(ROS)in electron-rich centers,while pollutants are captured and oxidized by the electron-deficient *** obtained electrons from pollutants are diverted to the electron-rich centers through bonding *** process breaks through the classic Fenton mechanism,and improves the performance and efficiency of pollutant removal in a wide pH ***,we provide a brief overview of Fenton's story and focus on combing the discovery and development of the DRC technology and mechanism in recent *** construction of the DRC and its performance in the pollutant degradation and interfacial reaction process are described in *** look forward to bringing a new perspective to continue Fenton's story through research and development of DRC technology.
The oxidative coupling of primary aromatic amines was investigated. Ce(SO4)2 can mediate the oxidative coupling of primary aromatic amines in water to dimers, trimers and/or tetramers, which depended on the substitu...
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The oxidative coupling of primary aromatic amines was investigated. Ce(SO4)2 can mediate the oxidative coupling of primary aromatic amines in water to dimers, trimers and/or tetramers, which depended on the substituents of primary aromatic amines. When 2,6-dimethylaniline or 2,6-diethylaniline was used as substrate, dimer, and tetramer were formed as major products. When 2,6-diisopropylaniline or 2,6-dihaloanilines was used as substrate, dimer, and trimer were formed. The mechanistic aspect was also investigated.
As intelligent vehicles usually have complex overtaking process,a safe and efficient automated overtaking system(AOS)is vital to avoid accidents caused by wrong operation of *** AOSs rarely consider longitudinal react...
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As intelligent vehicles usually have complex overtaking process,a safe and efficient automated overtaking system(AOS)is vital to avoid accidents caused by wrong operation of *** AOSs rarely consider longitudinal reactions of the overtaken vehicle(OV)during *** paper proposed a novel AOS based on hierarchical reinforcement learning,where the longitudinal reaction is given by a data-driven social preference *** AOS incorporates two modules that can function in different overtaking *** first module based on semi-Markov decision process and motion primitives is built for motion planning and *** second module based on Markov decision process is designed to enable vehicles to make proper decisions according to the social preference of *** on realistic overtaking data,the proposed AOS and its modules are verified *** results of the tests show that the proposed AOS can realize safe and effective overtaking in scenes built by realistic data,and has the ability to flexibly adjust lateral driving behavior and lane changing position when the OVs have different social preferences.
Time is a significant concept in distributed *** the increment of simulation system scale, working efficiency of simulation system will go down very sharply due to the restrictions of time management tactics and time ...
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ISBN:
(纸本)9781467355339
Time is a significant concept in distributed *** the increment of simulation system scale, working efficiency of simulation system will go down very sharply due to the restrictions of time management tactics and time sequence coupling. Therefore, it is necessary to study the characteristics of delay in simulation system to improve its working effeciency. Aiming at HLA-based distributed simulation system, causes of simulation delay is analysed and principles of delay testing is explained. A method which employs synchronization point setting and an effective wall clock time querying approach is put forward. Statistics and analysis of message interaction delay is executed on the software platform of pRTI 1.3 version. The measurement of delay lays an important data foundation for time management algorithms.
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