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Preparation of N-B doped composite electrode for iron-chromium redox flow battery

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Green Energy and Intelligent Transportation 2024年第3期3卷 1-10页

作者： Yingchun Niu Senwei Zeng guangfu wu Qingtan Gao Ruichen Zhou Chuanyuan Li Yang Zhou Quan Xu State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing102249BeijingChina

Iron-chromium redox flow battery(ICRFB)is an electrochemical energy storage technology that plays a vital role in dealing with the problems of discontinuity and instability of massive new energy generation and improving the acceptance capacity of the power *** cloth electrode(CC)is the main site where the electrochemical reaction occurs,which always suffers from the disadvantages of poor electrochemical reactivity.A new N-B codoped co-regulation Ti composite CC electrode(T-B-CC)is firstly generated and applied to ICRFB,where the REDOX reaction can be promoted significantly owing to the plentiful active sites generated on the modified *** contrasted with ICRFB with normal CC electrode,after 50 battery charge/discharge cycles,the discharge capacity(1,990.3 mAh vs 1,155.8 mAh)and electrolyte utilization(61.88%vs 35.94%)of ICRFB with CC electrode(T-B-CC)are significantly ***,the energy efficiency(EE)is maintained at about 82.7%under 50 cycles,which is 9.3%higher than that of the pristine electrically assembled *** comodulation of heteroatom doping and the introduction of Ti catalysts is a simple and easy method to improve the dynamics of the Cr^(3+)/Cr^(2+)and Fe^(3+)/Fe^(2+)reactions,enhancing the performance of ICRFBs.

关键词： Iron-chromium redox flow battery N-B co-doped co-regulation REDOX reaction rate Performance

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面向UAV辅助的WSN信息年龄优化算法

中山大学学报（自然科学版）（中英文） 2024年第5期63卷 148-155页

作者：王茜竹卢诗萱吴广富重庆邮电大学通信与信息工程学院重庆400065

提出了一种综合传感器能源供给、数据传输时效性和移动用户需求的系统平均信息年龄(AoI)优化算法。首先,采用无人机(UAV)辅助WSN来保障传感器的能量收集和数据传输。其次,引入AoI作为衡量指标,联合优化多设备调度、发射功率和UAV轨迹,... 详细信息

提出了一种综合传感器能源供给、数据传输时效性和移动用户需求的系统平均信息年龄(AoI)优化算法。首先,采用无人机(UAV)辅助WSN来保障传感器的能量收集和数据传输。其次,引入AoI作为衡量指标,联合优化多设备调度、发射功率和UAV轨迹,建立了以最小化传感器的平均AoI为目标的非凸优化问题。然后,通过约束松弛、变量替换和连续凸逼近等方法,将非凸问题转化为凸问题,并设计了一种迭代式的平均AoI最小化算法。仿真结果表明:该算法在满足移动用户体验的同时有效提升了传感器数据新鲜度。

关键词：无线传感器网络无人机信息年龄能量收集

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矿井煤自燃智能监测预警技术研究

煤矿现代化 2024年第5期33卷 20-24页

作者：路文文武光富黄陵矿业一号煤矿陕西延安727307

在煤矿开采期间最主要的一项灾害就是煤自燃,精准快速的监测煤自燃的参数,及时预警煤自燃的危险程度,这是实现煤矿安全高效生产的重要保障。立足于煤矿智能化发展趋势,提出了煤自燃智能化监测预警技术。结合煤自燃信息监测及煤自燃预测... 详细信息

在煤矿开采期间最主要的一项灾害就是煤自燃,精准快速的监测煤自燃的参数,及时预警煤自燃的危险程度,这是实现煤矿安全高效生产的重要保障。立足于煤矿智能化发展趋势,提出了煤自燃智能化监测预警技术。结合煤自燃信息监测及煤自燃预测预报,建立煤自燃智能监测预警系统。通过建立黄陵一矿煤自燃预警指标模型,开发出煤自燃智能监测预警系统,提升煤自燃监测预警能力、提高煤矿安全智能化发展水平。

关键词：煤矿智能化煤自燃火灾监测分级预警

STUDY OF ARTIFICIAL EYES HAVING HIGH STRENGTH AND LOW DENSITY

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Journal of wuhan University of Technology(Materials Science) 1999年第4期14卷 28-32页

作者： LI Xiaosheng wu guangfu Qiqihar University Qiqihar University China Dept. of Mat. Sci. and Engineering Qiqihar University Qiqihar 161006 China

The artificial eyes having high strength, low density and naturalmovement, which are made from hydroxyapatite and bioactive glass havebeen utilized ef- fectively in clinic. The technology of compoundinghydrox- yapatite, melting bioactive glass and making he artificaleyes are stated in this paper. In animal test, the bioactivity andbiocompatibility of the material making the artificial eyes areexamined by histological observation, SEM XRD and electronic *** the same time, application of the artificial eyes in clinic arealso introduced.

关键词： artificial eye seat natural movement hydroxyapatite

Energy-Efficient Power Allocation for IoT Devices in CR-NOMA Networks

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China Communications 2021年第4期18卷 166-181页

作者： guangfu wu Wenyi Zheng Yun Li Mengyuan Zhou School of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing400065China Chongqing Key Laboratory of Mobile Communications Technology Chongqing University of Posts and Telecommunications400065China

Non-orthogonal multiple access is a promising technique to meet the harsh requirements for the internet of things devices in cognitive radio *** improve the energy efficiency(EE)of the unlicensed secondary users(SU),a power allocation(PA)algorithm with polynomial complexity is *** first establish the feasible range of power consumption ratio using Karush-Kuhn-Tucker optimality conditions to support each SU’s minimum quality of service and the effectiveness of successive interference ***,we formulate the EE optimization problem considering the total transmit power requirements which leads to a non-convex fractional programming *** efficiently solve the problem,we divide it into an inner-layer and outer-layer optimization *** inner-layer optimization which is formulated to maximize the sub-carrier PA coefficients can be transformed into the difference of convex programming by using the first-order Taylor *** on the solution of the inner-layer optimization sub-problem,the concave-convex fractional programming problem of the outer-layer optimization sub-problem may be converted into the Lagrangian relaxation model employing the Dinkelbach *** results demonstrate that the proposed algorithm has a faster convergence speed than the simulated annealing algorithm,while the average system EE loss is only less than 2%.

关键词： cognitive radio-non-orthogonal multiple access(CR-NOMA) power allocation energy efficiency internet of things(IoT)

一种高效轻量的双参数椭圆曲线数字签名批量验证方案

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佳木斯大学学报（自然科学版） 2024年第1期42卷 1-5页

作者：巫光福傅晓艳周建东江西理工大学信息工程学院江西赣州341000

为解决大规模交易任务的签名验证给区块链节点带来繁琐的开销和经典的椭圆曲线数字签名算法(ECDSA)中耗时的模逆运算,提出一种高效轻量的双参数椭圆曲线数字签名(TP-ECDSA)批量验证方案。一方面,TP-ECDSA在签名和验证阶段均无模逆运算,... 详细信息

为解决大规模交易任务的签名验证给区块链节点带来繁琐的开销和经典的椭圆曲线数字签名算法(ECDSA)中耗时的模逆运算,提出一种高效轻量的双参数椭圆曲线数字签名(TP-ECDSA)批量验证方案。一方面,TP-ECDSA在签名和验证阶段均无模逆运算,在该算法中引入批量验证能将标量乘的计算次数从2t减少到[2,t+1]。另一方面,KGLP算法能加速标量乘运算,引入该算法能显著地提升签名验证的效率。实验表明,与ECDSA相比,不论是独立验证还是批量验证,TP-ECDSA的运行速度均提高了50%以上,签名验证效率显著提升。

关键词：椭圆曲线数字签名批量验证模逆运算标量乘运算 KGLP算法

A novel low-complexity power allocation algorithm based on the NOMA system in a low-speed environment

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Digital Communications and Networks 2021年第4期7卷 580-588页

作者： guangfu wu Wenyi Zheng Wei Xiong Yun Li Hongcheng Zhuang Xin Tan School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China Chongqing Municipal Housing Provident Fund Administration Center Chongqing401121China Chongqing Key Laboratory of Mobile Communications Technology Chongqing University of Posts and TelecommunicationsChongqing400065China Huawei Technologies Co Ltd.Shenzhen518129China

For future wireless communication systems,Power Domain Non-Orthogonal Multiple Access(PD-NOMA)using an advanced receiver has been considered as a promising radio access technology *** allocation plays an important role in the PD-NOMA system because it considerably affects the total throughput and Geometric Mean User Throughput(GMUT)***,most existing studies have not completely accounted for the computational complexity of the power allocation process when the User Terminals(UTs)move in a slow fading channel *** resolve such problems,a power allocation method is proposed to considerably reduce the search space of a Full Search Power(FSP)allocation *** initial power reallocation coefficients will be set to start with former optimal values by the proposed Lemma before searching for optimal power reallocation coefficients based on total throughput *** size and correction granularity will be adjusted within a much narrower power search range while invalid power combinations may be reasonably discarded during the search *** simulation results show that the proposed power reallocation scheme can greatly reduce computational complexity while the total throughput and GMUT performance loss are not greater than 1.5%compared with the FSP algorithm.

关键词： NOMA Power allocation Slow fading channel Low computational complexity

IMPROVEMENT ON SUSCEPTIBILITY OF ULTAR-HIGH STRENGTH STEEL TO STRESS CORROSION CRACKING BY HIGH TEMPERATURE QUENCHING

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 213-217页

作者： LI guangfu wu Rengen Harbin Institute of Technology,Harbin,China LI guangfu Division of Metallography,Harbin Institute of Technology,Harbin 150006,China

The effect of quenching temperature on the stress corrosion cracking of 30Cr3SiNiMoV ultra-high strength steel in 3.5% NaCl aqueous solution has been *** threshold K_(ISCC) may continuously increase with the quenching temperature raised from 870 to 1200℃ . All of the fractures are *** analyses of the segregation along prior austenitic grain boundaries,grain size and other microstructural factors reveal that the inerease of K_(ISCC) is mainly due to the coarsening of prior austenitic grains.

关键词： ultra-high strength steel stress corrosion cracking grain boundary segregation

β-Cyclodextrin derived full-spectrum fluorescent carbon dots: The formation process investigation and biological applications

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Chinese Chemical Letters 2023年第10期34卷 215-222页

作者： Peide Zhu Wenjing Li Yuqi Zhang Qiang Sun Yi Lin Ailin Qiu Xinyi Chen Yujin Zhou guangfu wu Yifan Li Zhiqiang Yu Quan Xu Dixian Luo Lulu Cai State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China Department of Laboratory Medicine Huazhong University of Science and Technology Union Shenzhen Hospital(Nanshan Hospital)Shenzhen 518052China Personalized Drug Therapy Key Laboratory of Sichuan Province Department of PharmacySichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu 611731China Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523018China

Carbon dots(CDs), a new building unit, have been revolutionizing the fields of biomedicine, bioimaging, and optoelectronics with their excellent physical, chemical, and biological properties. However, the difficulty of preparing excitation-dependent full-spectrum fluorescent CDs has seriously hindered their further research in fluorescence emission mechanisms and biomedicine. Here, we report full-spectrum fluorescent CDs that exhibit controlled emission changes from purple(380 nm) to red(613 nm) at room temperature by changing the excitation wavelength, and the excitation dependence was closely related to the regulation of sp2 and sp3 hybrid carbon structures by β-cyclodextrin-related groups. In addition,by regulating the content of β-cyclodextrin, the optimal quantum yields of full-spectrum fluorescent CDs were 8.97%, 8.35%, 7.90%, 9.69% and 17.4% at the excitation wavelengths of 340, 350, 390, 410 and 540 nm,respectively. Due to their excellent biocompatibility and color tunability, full-spectrum fluorescent CDs emitted bright and steady purple, blue, green, yellow, and red fluorescence in MCF-7 cells. Moreover, we optimized the imaging conditions of CDs and mitochondrial-specific dyes;and realized the mitochondrialtargeted co-localization imaging of purple, blue and green fluorescence. After that, we also explored the effect of full-spectrum fluorescent CDs in vivo fluorescence imaging through the intratumorally, subcutaneously, and caudal vein, and found that full-spectrum fluorescent CDs had good fluorescence imaging ability in vivo.

关键词： Carbon dots Multi-emission Fluorescence mechanism Mitochondrial targeting Color tenability Fluorescence imaging