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Energy-efficient reconfigurable processor for QC-LDPC via adaptive coding-voltage-frequency tuning

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 72-84页

作者： chang Libo hu Yiqing Du huimin Wang Jihe School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121China School of Computer Science Northwestern Polytechnical UniversityXi'an 710072China

To apply a quasi-cyclic low density parity check(QC-LDPC)to different scenarios,a data-stream driven pipelined macro instruction set and a reconfigurable processor architecture are proposed for the typical QC-LDPC *** data-level parallelism is improved by instructions to dynamically configure the multi-core computing ***,an intelligent adjustment strategy based on a programmable wake-up controller(WuC)is designed so that the computing mode,operating voltage,and frequency of the QC-LDPC algorithm can be *** adjustment can improve the computing efficiency of the *** QC-LDPC processors are verified on the Xilinx ZCU102 field programmable gate array(FPGA)board and the computing efficiency is *** experimental results indicate that the QC-LDPC processor can support two encoding lengths of three typical QC-LDPC algorithms and 20 adaptive operating modes of operating voltage and *** maximum efficiency can reach up to 12.18 Gbit/(s·W),which is more flexible than existing state-of-the-art processors for QC-LDPC.

关键词： quasi-cyclic low density parity check(QC-LDPC) dynamic voltage and frequency scaling(DVFS) reconfigurable computing coarse-grained reconfigurable arrays(CGRAs)

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A CFD model for numerical simulation of violent impact flow

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A CFD model for numerical simulation of violent impact flow

Multi-Scale Fusion Model Based on Gated Recurrent Unit for Enhancing Prediction Accuracy of State-of-Charge in Battery Energy Storage Systems

第十一届全国水动力学学术会议暨第二十四届全国水动力学研讨会并周培源诞辰110周年纪念大会

作者： ZHAO Xi-zeng hu chang-hong Department of Ocean Science and Engineering Zhejiang University RIAM Kyushu University

A robust and accurate 3D CIP-based model is developed,capable of capturing correctly complex three-dimensional free surface flows and,even more important,also capable of predicting an accurate pressure force. The flow is represented by one set of governing equations,which are solved numerically on a non-uniform,staggered Cartesian grid by a high-order finite difference *** governing equations are divided into an advection step and two non-advection steps by making use of a time splitting method.A CIP method is adopted to calculate the hyperbolic equation for velocity at the advection *** free surface is immersed in the computation domain and expressed by a one-fluid density *** this treatment the dynamic conditions at the free surface are automatically *** validity and utility of the numerical model are demonstrated by applying it to a 3-D dam-breaking problem and compared with a performed *** free surface capturing methods-VOF,CIP and THINC-are used for the interface *** attention is paid to the free surface and impact pressure. Numerical results show that the present CFD model is both robust and accurate for violent impact free-surface flow.

关键词： CIP method Free surface flow Wave breaking Dam breaking Water impact

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 405-414页

作者： Hao Liu Fengwei Liang Tianyu hu Jichao hong huimin Ma School of Computer and Communication Engineering University of Science and Technology BeijingBeijingChina School of Mechanical Engineering University of Science and Technology BeijingBeijingChina IEEE

Accurate prediction of the state-of-charge(SOC)of battery energy storage system(BESS)is critical for its safety and lifespan in electric *** overcome the imbalance of existing methods between multi-scale feature fusion and global feature extraction,this paper introduces a novel multi-scale fusion(MSF)model based on gated recurrent unit(GRU),which is specifically designed for complex multi-step SOC prediction in practical *** correlation analysis is first employed to identify SOC-related *** parameters are then input into a multi-layer GRU for point-wise feature ***,the parameters undergo patching before entering a dual-stage multi-layer GRU,thus enabling the model to capture nuanced information across varying time ***,by means of adaptive weight fusion and a fully connected network,multi-step SOC predictions are *** extensive validation over multiple days,it is illustrated that the proposed model achieves an absolute error of less than 1.5%in real-time SOC prediction.

关键词： Electric vehicle battery energy storage system(BESS) state-of-charge(SOC)prediction gated recurrent unit(GRU) multi-scale fusion(MSF).

Mn-modified nitrogen-doped Pt-based electrocatalyst for efficient oxygen reduction in aluminum-air batteries

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Nano Research 2024年第8期17卷 7126-7135页

作者： Li Gao Yang Song Xuebing Xu chang Li Chaoquan hu State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Zhongke Nanjing Institute of Green Manufacturing Industry Nanjing 211135China

In this study,a Mn-modified Pt-based catalyst loaded on nitrogen-doped Ketjen black(Mn-Pt/NKB)is prepared using a simple ethylene glycol reduction *** size of Pt nanoparticles(NPs)is effectively controlled by doping with Mn and *** the smallest average particle size of 1.7 nm,Mn-Pt/NKB demonstrates half-wave potentials of 0.890 and 0.688 V in the alkaline and neutral electrolytes,respectively,which are superior to those of commercial platinum on activated carbon(Pt/C).When applied as an air cathode in aluminum-air battery,it exhibits ultra-high power densities of 190(alkaline)and 26.2 mW·cm^(−2)(neutral).Moreover,the voltage remains stable after 5 h of *** practical application performance of the Mn-Pt/NKB catalyst in an aluminum-air battery is better than that of commercial Pt/***,the oxygen reduction reaction(ORR)mechanism on surfaces with different particle sizes is analyzed using density functional *** cracking is the major pathway on the surface of the small particles with lower energy consumption of 0.5 eV,while water molecule cleavage is the major pathway on the surface of the large particles with higher energy consumption of 0.97 *** lower energy consumption of the oxygen cracking pathway further confirms the ORR mechanism for higher activity on small-sized *** study provides a direction for the rational design of Pt-based catalysts for ORR and sheds light on the commercial development of aluminum-air batteries.

关键词： oxygen reduction reaction precious metal catalysts aluminum-air battery density functional theory(DFT)calculations reaction pathway

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用Markov模型预测长江水质

长江流域资源与环境 2006年第6期15卷 728-732页

作者：胡宏昌武汉大学数学与统计学院

由于长江水质的污染程度日益严重，为了说明治理长江对长江水质进行了简单的评价，保护长江迫在眉睫，首先，根据长江流域的17个观测站近两年多的水质检测数据统计，说明了近两年多来长江的防污治理工作有一定的效果。然后，根据1995～2... 详细信息

由于长江水质的污染程度日益严重，为了说明治理长江对长江水质进行了简单的评价，保护长江迫在眉睫，首先，根据长江流域的17个观测站近两年多的水质检测数据统计，说明了近两年多来长江的防污治理工作有一定的效果。然后，根据1995～2004年长江流域水质的数据报告，考虑各类水之间的相互转化，构造了马尔柯夫（Markov）转移矩阵，建立了马尔柯夫预测模型，通过已有的观测数据验证了该模型的正确性及有效性。运用该马尔柯夫模型预测未来10年水质的变化趋势，即Ⅰ、Ⅱ、Ⅲ、Ⅳ类水逐年减少，而Ⅴ、劣Ⅴ类水逐年增加。到2014年，长江的第Ⅰ类水只有0．4059％，劣Ⅴ类水达到26．2714％，不可饮用水（即第Ⅳ，Ⅴ，劣Ⅴ类水）将达到47．468％，为此应采取更加有效的治理措施，控制长江水质的恶化。最后，通过计算，得到了每年需要处理污水的最小百分比，才能杜绝劣Ⅴ类水，将第Ⅳ、Ⅴ类水控制在20％内，从而才能保证我们有足够的饮用水。

关键词：长江水质 Markov模型预测

Plasmon-enhanced ultra-high photoresponse of single-wall carbon nanotube/copper/silicon near-infrared photodetectors

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Nano Research 2024年第7期17卷 5930-5936页

作者： Yi-Ming Zhao Xian-Gang hu Chao Chen Zuo-hua Wang An-Ping Wu hong-Wang Zhang Peng-Xiang Hou chang Liu hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Single wall carbon nanotube(SWCNT)/Si heterojunction photodetectors have the advantages of high photoresponse ability and simple structure,however,their detection wavelength range are usually lower than 1100 nm,which limits their application in the infrared *** report a SWCNT/Cu/Si photodetector with both a high photoresponse and a detection range up to the infrared band by depositing a Cu nanoparticles(NPs)layer between a SWCNT film and a n-Si *** was found that the Cu NPs produce strong surface plasmon resonance(SPR)under laser irradiation,which breaks through the limitation of Si band gap and greatly improves the photoresponse of the SWCNT/Cu/Si photodetector in the near infrared *** responsivity(R)of the photodetector in the wavelength range of 1850–1200 nm reached 2.2–14.15 mA/W,which is the highest value in the reported plasmon enhanced n-Si based photodetectors,and about 20,000 times higher than that of a SWCNT/Si *** R value for 1550 nm wavelength used in optical communications reached~8.2 mA/W,which is 64%higher than the previously reported values of commonly used *** attribute the significant increase to the strong SPR and low Schottky barrier of Cu with n-Si,which facilitates the generation and transfer of the carriers.

关键词： single wall carbon nanotube photodetector silicon surface plasmon resonance copper

Biophotoelectrochemistry for the treatment of emerging contaminants

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Science China Technological Sciences 2024年第10期67卷 3051-3066页

作者： hu Jing CHEN Man GU WenZhi DENG WenEr hong MingQiu hu AnDong YE Jie ZHOU ShunGui Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry University

Emerging contaminants(ECs) of significant concern are widely distributed throughout the environment due to various industrial practices and human activities. Given the alarming ecological threats and potential risks that ECs pose to human health and aquatic life, even at trace concentrations, it is imperative to develop innovative technologies to effectively address these challenges. The biophotoelectrochemistry(BPEC) system, which integrates microbial cells with photosensitizers for solar-tochemical conversion, holds great potential as an efficient strategy for the removal of ECs. In this review, we provide new insights into the BPEC system for the ECs treatment by systematically summarizing the classification, sources, and environmental occurrence of ECs. Additionally, we explore the research progress and degradation mechanisms in ECs removal with ***, the current challenges and future perspectives for the applications of the BPEC system in the ECs treatment are *** review aims to promote the development of BPEC technology for ECs treatment, offering a promising prospect for environmental remediation, circular economy, and clean-energy production.

关键词： emerging contaminants biophotoelectrochemistry photocatalysis biodegradation

Improved Reall-Santos method for AdS black holes in general 4-derivative gravities

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 74-86页

作者： Peng-Ju hu Liang Ma hong Lü Yi Pang Center for Joint Quantum Studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Peng huanwu Center for Fundamental Theory Hefei 230026China

For asymptotically flat black holes,Reall-Santos method is a convenient tool to compute leading higher derivative corrections to the thermodynamic quantities without actually solving the modified field ***,there are subtleties in its generalization to asymptotically AdS black holes with general higher derivative *** of all,it is necessary to know all the higher derivative holographic counterterms and the surface terms implementing the variational principle and subtracting the *** then needs to solve for the modified AdS radius and rescale the time coordinate in an appropriate way such that the induced metric on the conformal boundary of AdS black hole is not *** observe that Reall-Santos method can be directly applied to a particular 4-derivative gravity model,known as the Einstein-Weyl gravity,which does not modify the AdS radius and requires only the Gibbons-Hawking-York term and holographic counterterms for the 2-derivative *** thus suggest that to compute the thermodynamic quantities of AdS black holes in general 4-derivative theories of gravity,one simply needs to transform it to a Einstein-Weyl gravity with identical thermodynamic variables by appropriate field *** explicitly verify this proposal with spherically-symmetric and static charged black holes in Einstein-Maxwell theory extended with generic 4-derivative interactions.

关键词： black holes thermodynamics higher-derivative corrections effective theories higher dimensional black holes quantum gravity

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半参数回归模型的泛补偿最小二乘估计

工程数学学报 2005年第3期22卷 487-492页

作者：胡宏昌武汉大学数学与统计学院

本文首先提出泛补偿最小二乘法;接着,使用该法考虑半参数回归模型,得到了参数及非参数的估计;然后,将泛补偿最小二乘法与补偿最小二乘法进行了比较;最后用模拟的算例说明了该方法的有效性。

关键词：半参数回归模型泛补偿最小二乘估计补偿最小二乘法则岭估计法则