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可再生能源电解水制备绿氢研究进展

湖南电力 2023年第6期43卷 23-30页

作者：孛衍君何舟磊杨竞择林子若姚洪华中科技大学煤燃烧与低碳利用全国重点实验室湖北武汉430074

基于可再生能源电力制备绿氢对削峰填谷、电力消纳的潜在作用,介绍不同种类的电解槽设备,对基于风能、太阳能、水能和地热能的绿氢制备系统进行研究,分析其应用现状及可行性,并对可再生能源电解水制备绿氢系统的发展方向进行展望,为氢... 详细信息

基于可再生能源电力制备绿氢对削峰填谷、电力消纳的潜在作用,介绍不同种类的电解槽设备,对基于风能、太阳能、水能和地热能的绿氢制备系统进行研究,分析其应用现状及可行性,并对可再生能源电解水制备绿氢系统的发展方向进行展望,为氢能产业的发展提供建议。

关键词：可再生能源电解水技术绿氢平准化制氢成本

Self-attention reinforcement learning for multi-beam combining in mmW ave 3D-MIMO systems

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Science China(Information Sciences) 2023年第6期66卷 204-221页

作者： Yingzhi HUANG Zhaoyang ZHANG jingze CHE Zhaohui yang Qianqian yang Kai-Kit WONG College of Information Science and Electronic Engineering Zhejiang University Department of Electronic and Electrical Engineering University College London

Machine learning(ML)has been empowering all aspects of the wireless communication system design, among which, the reinforcement learning(RL)-based approaches have attracted a lot of research attention since they can interact with the environment directly and learn from the collected experiences efficiently. In this paper, we propose a novel and efficient RL-based multi-beam combining scheme for future millimeter-wave(mmWave)three-dimensional(3D)multi-input multi-output(MIMO)communication systems. The proposed scheme does not require perfect channel state information(CSI)or precise user location information which both are generally difficult to obtain in practice, and well addresses the crucial challenge of computational complexity incurred by the extremely huge state and action spaces associated with multiple users, multiple paths, and multiple 3D beams. In particular, a self-attention deep deterministic policy gradient(DDPG)-based beam selection and combination framework is proposed to learn the 3D beamforming pattern without CSI adaptively. We aim to maximize the sum-rate of the mmWave 3D-MIMO system by optimizing the serving beam set and the corresponding combining weights for each user. To this end, the transformer is incorporated into the DDPG to obtain the global information of the input elements and capture the signal directions precisely, which leads to a near-optimal beamformer design. Simulation results verify the superiority of the proposed self-attention DDPG over conventional ML-based beamforming schemes in terms of sum-rate under various scenarios.

关键词： reinforcement learning (RL) deep deterministic policy gradient (DDPG) self-attention precoding/combining millimeter-wave (mmWave) multi-input multi-output (MIMO)

微创经皮锁定加压钢板内固定术治疗四肢骨折的临床疗效探讨

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世界复合医学 2021年第9期7卷 149-153页

作者：张涵尹劲杨靖泽黄杰平周兆文昆明市第一人民医院甘美医院骨科云南昆明650000

目的探讨四肢骨折患者采用微创经皮锁定加压钢板内固定术治疗的临床效果。方法对该院收治的四肢骨折患者展开研究,共计选取80例患者为研究对象,病例收集时间在2019年1月—2020年12月,所有患者均拟行手术治疗,按照均等单盲方将80例患者... 详细信息

目的探讨四肢骨折患者采用微创经皮锁定加压钢板内固定术治疗的临床效果。方法对该院收治的四肢骨折患者展开研究,共计选取80例患者为研究对象,病例收集时间在2019年1月—2020年12月,所有患者均拟行手术治疗,按照均等单盲方将80例患者分为对照组(n=40)和观察组(n=40),两组均给予钢板内固定术进行治疗,而观察组在此基础上实施微创经皮锁定加压钢板内固定术进行治疗,对比两组患者的临床治疗效果。结果观察组手术时长、住院时长和骨折愈合时间均短于对照组,手术失血量少于对照组,差异有统计学意义(P0.05);观察组手术后3 d和手术后1周疼痛评分均低于对照组,差异有统计学意义(P0.05);观察组手术后IL-6、IL-8、hs-CRP和TNF-α水平均低于对照组,差异有统计学意义(P0.05);观察组手术后生活质量4个维度评分均高于对照组,差异有统计学意义(P<0.05)。观察组并发症发生率(7.50%)低于对照组(25.00%),差异有统计学意义(χ^(2)=4.501,P<0.05)。结论四肢骨折患者采用微创经皮锁定加压钢板内固定术治疗具有创伤小,并发症少的优势,可以有效促进患者尽早康复,提高患者的生活质量,临床治疗效果显著。

关键词：四肢骨折微创经皮锁定加压钢板内固定术疼痛血清炎性因子并发症生命质量

脊柱微创手术治疗骨质疏松性椎体骨折的临床效果分析

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世界复合医学 2021年第8期7卷 106-110页

作者：张涵尹劲杨靖泽黄杰平周兆文昆明市第一人民医院甘美医院骨科云南昆明650000

目的探讨对骨质疏松性椎体骨折患者采用脊柱微创手术治疗的临床效果。方法现选取150例骨质疏松性椎体骨折患者为研究对象,研究时间在2019年1月—2020年12月,按照随机数表法将150例患者分为对照组和研究组,每组75例,其中对照组患者采用... 详细信息

目的探讨对骨质疏松性椎体骨折患者采用脊柱微创手术治疗的临床效果。方法现选取150例骨质疏松性椎体骨折患者为研究对象,研究时间在2019年1月—2020年12月,按照随机数表法将150例患者分为对照组和研究组,每组75例,其中对照组患者采用保守治疗,而研究组患者采用脊柱微创手术治疗,对比两组患者的治疗效果。结果研究组治疗总有效率93.33%高于对照组73.33%,差异有统计学意义(χ^(2)=10.800,P0.05);治疗6周和12周后,研究组疼痛评分均低于对照组,差异有统计学意义(P0.05);研究组治疗后椎体前缘高度和椎体中部高度高于对照组,Cobb角小于对照组,差异有统计学意义(P0.05);研究组治疗后两项评分均高于对照组,差异有统计学意义(P<0.05)。研究组并发症发生率5.33%低于对照组16.00%,差异有统计学意义(P<0.05)。结论对骨质疏松性椎体骨折患者采用脊柱微创手术治疗不仅可以有效改善患者的疼痛症状,促进骨折端的愈合,还可以减少并发症的出现,改善患者的预后情况,提高患者的临床治疗效果,临床应用价值显著。

关键词：骨质疏松性椎体骨折脊柱微创手术保守治疗疼痛神经功能恢复日常生活质量并发症

NAS4RRAM: neural network architecture search for inference on RRAM-based accelerators

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Science China(Information Sciences) 2021年第6期64卷 89-99页

作者： Zhihang YUAN jingze LIU Xingchen LI Longhao YAN Haoxiang CHEN Bingzhe WU Yuchao yang Guangyu SUN Center for Energy-Efficient Computing and Applications Peking University Department of Micro/nanoelectronics Peking University Center for Brain Inspired Chips Institute for Artificial IntelligencePeking University

The RRAM-based accelerators enable fast and energy-efficient inference for neural ***, there are some requirements to deploy neural networks on RRAM-based accelerators, which are not considered in existing neural networks.(1) Because the noise problem and analog-digital converters/digitalanalog converters(ADC/DAC) affect the prediction accuracy, they should be modeled in networks.(2) Because the weights are mapped to the RRAM cells, they should be quantized, and the number of weights is limited by the number of RRAM cells in the accelerator. These requirements motivate us to customize the hardware-friendly network for the RRAM-based accelerator. We take the idea of network architecture search(NAS) to design networks with high prediction accuracy that meet the requirements. We propose a framework called NAS4RRAM to search for the optimal network on the given RRAM-based accelerator. The experiments demonstrate that NAS4RRAM can apply to different RRAM-based accelerators with different scales. The performance of searched networks outperforms the manually designed ResNet.

关键词： network architecture search (NAS neural networks RRAM-based accelerator hardware noise quantization

Removal of bromate ion using powdered activated carbon

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Journal of Environmental Sciences 2010年第12期22卷 1846-1853页

作者： Lian Wang Jie Zhang jingze Liu Hong He Min yang Jianwei Yu Zichuan Ma Feng Jiang College of Life Science Hebei Normal University Shijiazhuang 050016 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Chemistry & Material Science Hebei Normal University Shijiazhuang 050016 China Beijing YADU Indoor Environmental Protection Science and Technology Co. Ltd. Beijing 102206 China

Bromate ion （BrO3-） removal from drinking water by powdered activated carbons （PACs） in bath mode was evaluated under various operational conditions. Six kinds of PACs, including wood-based carbon, fruit-based carbon, coal-based carbon, and these three carbons thermally deoxidized in a nitrogen atmosphere, were selected to investigate their capacity on BrO3- removal. With the highest zeta potential value and being richly mesoporous, coal-based carbon had a high and an excellent BrO3- adsorption efficiency. The removal content of BrO3- by per gram of coal-based carbon was 0.45 mg within 5 hr in 100 μg/L bromate solution. The surface characteristics of PACs and bromide formation revealed that both physical and chemical PACs properties simultaneously affected the adsorptionreduction process. Under acidic conditions, PACs possessed high zeta value and adequate basic groups and exhibited neutral or positive charges, promoting BrO3- adsorption-reduction on the carbon surface. Interestingly, the PACs thermally deoxidized in N2 atmosphere optimized their properties, e.g. increasing their zeta values and decreasing the oxygen content which accelerated the BrO3- removal rate. The maximum adsorption capacity of fruit-based carbon was the highest among all tested carbons （99.6 mg/g）, possibly due to its highest pore volume. Remarkably, the thermal regeneration of PACs in N2 atmosphere could completely recover the adsorption capacity of PACs. The kinetic data obtained from carbons was analyzed using pseudo second-order and intraparticle diffusion models, with results showing that the intraparticle diffusion was the more applicable model to describe adsorption of BrO3- onto PACs.

关键词： bromate powdered activated carbons adsorption-reduction process adsorption capacity

Mn-doped perovskite-type oxide LaFeO3 as highly active and durable bifunctional electrocatalysts for oxygen electrode reactions

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Frontiers of Materials Science 2020年第4期14卷 459-468页

作者： jingze ZHANG Sheng ZHU Yulin MIN Qunjie XU Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai Engineering Research Center of Energy-Saving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Perovskite oxides based on the alkaline earth metal lanthanum for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)in alkaline electrolytes are promising catalysts,but their catalytic activity and stability remain ***,we synthesized a series of LaFe1-xMn2O3(x=0,0.1,0.3,0.5,0.7,0.9 and 1)perovskite oxides by doping Mn into LaFeO3(LF).The results show that the doping amount of Mn has a significant effect on the catalytic *** x=0.5,the catalyst ***3(LFM)exhibits the best *** limiting current density in 0.1 mol·L^-1 KOH solution is 7 mA·cm^-2,much larger than that of the commercial Pt/C catalyst(5.5 mA·cm^-2).Meanwhile,the performance of the doped catalyst is also superior to that of commercial Pt/C in terms of the long-term *** excellent catalytic performance of LFM may be ascribed to its abundant 0^2-/0^-species and low charge transfer resistance after doping the Mn element.

关键词： oxygen electrode reaction oxygen reduction reaction oxygen evolution reaction perovskite electrocatalyst LaFeO3

Sodium Titanate/Carbon （Na2Ti3O7/C） Nanofibers via Electrospinning Technique as the Anode of Sodium-ion Batteries

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Chinese Journal of Chemistry 2017年第1期35卷 79-85页

作者： Wei Zou Cong Fan jingze Li State Key Laboratory of Electronic Thin Films and Integrated Devices School of Microelectronics and Solid-state Electronics University of Electronic Science and Technology of China Chengdu Sichuan 610054 China

To overcome the sluggish kinetics in sodium-ion batteries, sodium titanate/carbon （Na2Ti3O7/C） composite nanofibers as anode materials have successfully been synthesized via a simple electrospinning method. After calcination at 800 ℃ for 3 h, the obtained Na2Ti3O7 nanoparticles are randomly dispersed in the matrix of in situ pyrolized carbon nanofiber. The Na2Ti3O7/C hybrid nanofiber obtained with 2.5 wt% ofpoly （vinylpyrrolidone） additive in the precursor solution has the smallest diameter of-120 nm and the finest particle size of -40 nm, exhibiting the best rate performance of 101 mAh.g-1 at 4 C and excellent capacity retention of 82% at 1 C after 100 cycles. Furthermore, this composite nanofiber also demonstrates good cycling performance under low current density of 0.1 C, which is attributed to the formation of stable solid electrolyte interface （SEI） film induced by small volume expansion/contraction of the fine NazTi3O7 nanoparticles during the charge/discharge process.

关键词： sodium titanate electrospinnig method nanofiber sodium-ion battery

Stereoselective electrochemical carboxylation ofα,β-unsaturated sulfones

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Chinese Chemical Letters 2023年第6期34卷 315-318页

作者： Zi-Xin yang Liangchuan Lai jingze Chen Hong Yan Ke-Yin Ye Fen-Er Chen Institute of Pharmaceutical Science and Technology College of ChemistryFuzhou UniversityFuzhou 350108China Department of Chemistry Engineering Center of Catalysis and Synthesis for Chiral MoleculesFudan UniversityShanghai 200433China Shanghai Engineering Research Center of Industrial Asymmetric Catalysis of Chiral Drugs Fudan UniversityShanghai 200433China

As an attractive C1 synthon,carbon dioxide(CO_(2))has been extensively used in organic synthesis to produce carboxylic *** this research,stereoselective electrochemical carboxylation ofα,β-unsaturated sulfones has been developed under transition-metal-free *** the cinnamic acids and the derivatives are obtained selectively in the ***,arylpropiolates also can be produced from alkynyl sulfones.

关键词： Electrosynthesis Carbon dioxide Carboxylation α β-Unsaturated sulfone α β-Unsaturated carboxylic acid