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Rational construction of phosphate layer to optimize Cu-regulated Fe_(3)O_(4) as anode material with promoted energy storage performance for rechargeable Ni-Fe batteries

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Journal of Materials Science & Technology 2022年第13期108卷 133-141页

作者： Shuhua Hao Yupeng Xing Peiyu Hou Gang Zhao Jinzhao huang Shipeng Qiu Xijin xu Laboratory of Functional Micro and Nano Materials and Devices School of Physics and TechnologyUniversity of JinanJinan 250024China

Flexible aqueous energy storage devices with high security and flexibility are crucial for the progress of wearable energy storage.Particularly,aqueous rechargeable Ni-Fe batteries owning a large theoretical capacity,low cost and outstanding safety characteristics have emerged as a promising candidate for flexible aqueous energy storage devices.Herein,Cu-doped Fe_(3)O_(4)(CFO)with 3D coral structure was prepared by doping Cu^(2+) based on Fe_(3)O_(4)nanosheets(FO).Furthermore,the Fe-based anode material(CFPO)grown on carbon fibers was obtained by reconstructing the surface of CFO to form a low-crystallization shell which can enhance the ion transport.Excitingly,the newly developed CFPO electrode as an innovative anode material further exhibited a high capacity of 117.5 mAh g^(-1)(or 423 F g^(-1))at 1 A g^(-1).Then,the assembled aqueous Ni-Fe batteries with a high cell-voltage output of 1.6 V deliver a high capacity of 49.02 mAh g^(-1) at 1 A g^(-1) and retention ratio of 96.8%for capacitance after 10000 continuous cycles.What’s more,the aqueous quasi-solid-state batteries present a remarkable maximal energy density of 45.6 Wh kg^(-1) and a power density of 12 kW kg^(-1).This work provides an innovative and feasible way and optimization idea for the design of high-performance Fe-based anodes,and may promote the development of a new generation of flexible aqueous Ni-Fe batteries.

关键词： Ni-Fe batteries High voltage window regulation High energy and power density Anode materials Amorphous phosphate layer

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干式高速高效车削D6AC高强钢的试验研究

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兵器材料科学与工程 2024年第1期47卷 83-88页

作者：韩英瑞庄重石海城黄树涛许立福张玉璞于晓琳沈阳理工大学机械工程学院辽宁沈阳110159 辽沈工业集团有限公司辽宁沈阳110045

研究了TiCN+Al_(2)O_(3)涂层硬质合金刀具在高速高效车削未淬火处理的D6AC高强钢时,刀具磨损的特点及加工过程中切削力、切削温度和工件表面粗糙度的变化规律。结果表明:刀具磨损形态主要为后刀面磨损,在切削后期刀具前刀面发生局部破损... 详细信息

研究了TiCN+Al_(2)O_(3)涂层硬质合金刀具在高速高效车削未淬火处理的D6AC高强钢时,刀具磨损的特点及加工过程中切削力、切削温度和工件表面粗糙度的变化规律。结果表明:刀具磨损形态主要为后刀面磨损,在切削后期刀具前刀面发生局部破损,后刀面发生剧烈磨损;刀具正常磨损阶段,各切削分力增长缓慢,主切削力>轴向力>径向力,当刀具破损发生剧烈磨损时,轴向力和径向力均波动较大,其平均值下降;刀具切出位置最高温度远高于工件已加工表面最高温度,在刀具正常磨损阶段,温度增长较平缓;加工表面粗糙度变化,刀具破损后工件表面沟痕明显加深。

关键词：高强钢刀具磨损切削力切削温度表面粗糙度

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国产与进口XLPE绝缘高压交流电缆短时与长时击穿特性

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南方电网技术 2024年第2期18卷 124-132页

作者：伍国兴张成巍陈潇徐曙贾磊侯帅展云鹏朱闻博深圳供电局有限公司广东深圳518000 南方电网科学研究院广州510663

为探究国内外高压电缆XLPE绝缘料的性能差异,制备了220 kV国产与进口电缆绝缘切片试样,对比了两种绝缘料的分子量、熔融和结晶特性、交联副产物含量、短时击穿特性与长时击穿特性。实验结果表明:国产220 kV XLPE电缆绝缘的分子结构、结... 详细信息

为探究国内外高压电缆XLPE绝缘料的性能差异,制备了220 kV国产与进口电缆绝缘切片试样,对比了两种绝缘料的分子量、熔融和结晶特性、交联副产物含量、短时击穿特性与长时击穿特性。实验结果表明:国产220 kV XLPE电缆绝缘的分子结构、结晶度、熔融温度以及副产物含量均与进口绝缘料无明显差异。分析了两种绝缘料短时击穿场强的Weibull分布特性,发现30~50℃下国产XLPE绝缘特征击穿场强高于进口绝缘料,而当温度超过70℃时国产XLPE绝缘特征击穿场强显著下降且低于进口绝缘料,并且国产XLPE绝缘料击穿场强分散性更高。分析了70℃下两种绝缘料在5个电场下的击穿时间,采用反幂模型分析了击穿电场和时间直接的关系,结果表明国产与进口220 kV绝缘料寿命指数值分别为19.3和19.5。研究结果对国产XLPE绝缘的研发与应用提供了理论与实验支撑。

关键词： XLPE 高压电缆理化性能短时击穿长时击穿

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卤代硝基苯高选择性加氢催化剂研究进展

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现代化工 2024年第5期44卷 54-58,65页

作者：徐洋张慧敏顾逸涛陆林巍梁金花任晓乾南京工业大学化工学院江苏南京211816 南京工业大学生物与制药工程学院江苏南京211816

综述了近年来卤代硝基苯液相催化加氢非均相催化剂的研究进展,包括贵金属催化剂和非贵金属催化剂,并对其抑制脱卤的机理进行了阐述,最后对未来卤代硝基苯催化加氢催化剂的研究进行了展望。

关键词：卤代硝基苯卤代苯胺催化加氢选择性催化剂

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不同产地半夏农艺性状及光合生理特性研究

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中国农业科技导报 2024年第5期26卷 77-89页

作者：许祎珂李爽刘长乐寇佩雯孙晓春黄文静陕西中医药大学陕西中药资源产业化省部共建协同创新中心秦药特色资源研究开发国家重点实验室(培育)陕西咸阳712083

为分析不同产地半夏在同一试验地的农艺性状及光合生理特性差异,以2年生20个不同产地的半夏为试验材料,测定其农艺性状、光合生理指标及叶绿素荧光参数。结果表明,不同产地半夏在农艺性状上存在显著差异,其中,陕西商洛产半夏的植株最高... 详细信息

为分析不同产地半夏在同一试验地的农艺性状及光合生理特性差异,以2年生20个不同产地的半夏为试验材料,测定其农艺性状、光合生理指标及叶绿素荧光参数。结果表明,不同产地半夏在农艺性状上存在显著差异,其中,陕西商洛产半夏的植株最高、种球最大;贵州贵阳产半夏的叶面积最大;河北保定产半夏的农艺性状整体较低。不同产地半夏的光合参数也存在明显差异,推测其光合特性和光能利用率具有较大差别,四川和贵州产半夏具有较高光合潜力。相关性分析发现,净光合速率(net photosynthetic rate,Pn)与气孔导度(stomatal conductance,Gs)、水分利用率(water use rate,WUE)、最大荧光(maximal fluorescence,Fm)、电子传递速率(electron transport rate,ETR)和叶绿素a(chlorophyll a)含量呈极显著(P<0.01)正相关,与叶绿素b(chlorophyll b)含量呈显著(P<0.05)正相关。主成分分析发现,种球直径、中裂叶长、株高、蒸腾速率(transpiration rate,Tr)、光化学淬灭系数(photochemical quenching,qP)和胞间CO_(2)浓度(intercellular CO_(2) concentration,Ci)是影响半夏生长的主要指标。聚类分析发现,四川、贵州、甘肃、河南、湖南和陕西等产地的半夏农艺性状表现较好,且具有较强的光合潜力,被聚为第Ⅰ类;保定、邢台、张家口和文山等产半夏的各项指标较低,被聚为第Ⅱ类。综上所述,四川、贵州、甘肃、河南、湖南和陕西的半夏种源具有明显优势,有良好的培育前景。以上研究结果为半夏良种选育提供了理论依据。

关键词：不同产地半夏农艺性状光合生理叶绿素荧光

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Nerve growth factor-basic fibroblast growth factor poly-lactide co-glycolid sustained-release microspheres and the small gap sleeve bridging technique to repair peripheral nerve injury

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Neural Regeneration Research 2023年第1期18卷 162-169页

作者： Ming Li Ting-Min xu Dian-Ying Zhang xiao-Meng Zhang Feng Rao Si-Zheng Zhan Man Ma Chen Xiong xiao-Feng Chen Yan-Hua Wang Department of Trauma and Orthopedics Peking University People’s HospitalBeijingChina Key Laboratory of Trauma and Neural Regeneration(Peking University) Ministry of EducationBeijingChina Trauma Medicine Center Peking University People’s HospitalNational Center for Trauma MedicineBeijingChina

We previously prepared nerve growth factor poly-lactide co-glycolid sustained-release microspheres to treat rat sciatic nerve injury using the small gap sleeve technique.Multiple growth factors play a synergistic role in promoting the repair of peripheral nerve injury;as a result,in this study,we added basic fibroblast growth factors to the microspheres to further promote nerve regeneration.First,in an in vitro biomimetic microenvironment,we developed and used a drug screening biomimetic microfluidic chip to screen the optimal combination of nerve growth factor/basic fibroblast growth factor to promote the regeneration of Schwann cells.We found that 22.56 ng/mL nerve growth factor combined with 4.29 ng/mL basic fibroblast growth factor exhibited optimal effects on the proliferation of primary rat Schwann cells.The successfully prepared nerve growth factor-basic fibroblast growth factor-poly-lactide-co-glycolid sustained-release microspheres were used to treat rat sciatic nerve transection injury using the small gap sleeve bridge technique.Compared with epithelium sutures and small gap sleeve bridging alone,the small gap sleeve bridging technique combined with drug-free sustained-release microspheres has a stronger effect on rat sciatic nerve transfection injury repair at the structural and functional level.

关键词： biomimetic microfluidic chip growth factor in vitro biomimetic microenvironment nerve function peripheral nerve injury sciatic nerve small gap sleeve bridging sustained-release microspheres

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PVDF-HFP-SN-based gel polymer electrolyte for high-performance lithium-ion batteries

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Nano Research 2023年第7期16卷 9480-9487页

作者： Ruling huang Ruochen xu Jiangtao Zhang Jiayun Wang Tianyi Zhou Mingyi Liu xiaolong Wang Huaneng Clean Energy Research Institute Beijing 102209China

Gel polymer electrolytes(GPEs)have attracted extensive attention in lithium-ion batteries due to their high security and excellent electrochemical performance.However,their inferior Li-ion transference number,low room-temperature ionic conductivity,and poor long cycle stability raise challenges in practical applications.Herein,a flexible poly(vinylidene fluoride-cohexafluoropropylene)-butanedinitrile(PVDF-HFP-SN)-based GPE(PSGPE)is synthesized successfully by a general immersion precipitation method.The resultant PSGPEs have numerous connecting pores to ensure sufficient space for liquid electrolytes.Moreover,the reduced crystallinity of PVDF-HFP and the high polarity of SN can reduce the energy barrier of Li-ions shuttling between pores.The synergistic effect possesses a high ionic conductivity of 1.35 mS·cm^(-1)at room temperature with a high Li-ion transference number of 0.69.The PVDF-HFP-SN-based GPE is applied in a LiFePO_(4)/graphite battery,which can realize stable cycling performance for 350 cycles and good rate performance at room temperature.These results demonstrate that the novel PSGPE possesses advantage in simplified production process,which can improve the practicability of gel polymer lithium-ion batteries.

关键词： poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)-based butanedinitrile(SN) gel polymer electrolyte synergistic effect

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某半地下污水处理厂提标改造及扩容工程设计技术要点分析

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给水排水 2024年第3期50卷 32-37页

作者：乔晓娟赵志勇王胤黄旭杨舒茗赵晓龙贺强强中国市政工程西南设计研究总院有限公司成都610084

合肥某半地下污水处理厂2017年启动提标改造及扩容工程。因工艺单元立体叠加和构筑物平面组团布局使半地下污水处理厂在设计建造中具有占地小的显著优势,但在技术改造工程中却成为明显的制约因素。项目提标改造设计中,与二期工程统筹考... 详细信息

合肥某半地下污水处理厂2017年启动提标改造及扩容工程。因工艺单元立体叠加和构筑物平面组团布局使半地下污水处理厂在设计建造中具有占地小的显著优势,但在技术改造工程中却成为明显的制约因素。项目提标改造设计中,与二期工程统筹考虑,在对既有设施工艺核算与采用CFD流体仿真模拟等基础上,采用生化池流态改造及新增深度处理单元等技术措施,实现精准改造。改造工程建成投产后,项目出水水质稳定达到考核排放标准和内控水质标准。

关键词：半地下式污水处理厂提标改造深床滤池水力流态

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Time-varying baseline error correction method for ground-based micro-deformation monitoring radar

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Journal of Systems Engineering and Electronics 2022年第4期33卷 938-950页

作者： LEI Tianjie WANG Jiabao huang Pingping TAN Weixian QI Yaolong xu Wei ZHAO Chun China Institute of Water Resources and Hydropower Research Beijing 100038China Institute of Environment and Sustain-able Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100083China College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100098China College of Information Engineering Inner Mongolia University of TechnologyHohhot 010051China Inner Mongolia Key Laboratory of Radar Technology and Application Hohhot 010051China

In recent years, ground-based micro-deformation monitoring radar has attracted much attention due to its excellent monitoring capability. By controlling the repeated campaigns of the radar antenna on a fixed track, ground-based micro-deformation monitoring radar can accomplish repeat-pass interferometry without a space baseline and thus obtain highprecision deformation data of a large scene at one time. However, it is difficult to guarantee absolute stable installation position in every campaign. If the installation position is unstable, the stability of the radar track will be affected randomly, resulting in time-varying baseline error. In this study, a correction method for this error is developed by analyzing the error distribution law while the spatial baseline is unknown. In practice, the error data are first identified by frequency components, then the data of each one-dimensional array(in azimuth direction or range direction) are grouped based on numerical distribution period, and finally the error is corrected by the nonlinear model established with each group.This method is verified with measured data from a slope in southern China, and the results show that the method can effectively correct the time-varying baseline error caused by rail instability and effectively improve the monitoring data accuracy of groundbased micro-deformation radar in short term and long term.

关键词： ground-based micro-deformation monitoring radar deformation monitoring time-varying baseline error compensation

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Angular disturbance prediction for countermeasure launcher in active protection system of moving armored vehicle based on an ensemble learning method

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Defence Technology（防务技术） 2023年第3期21卷 207-218页

作者： Chun-ming Li Guang-hui Wang Hai-ping Song xu-feng huang Qi Zhou China North Vehicle Research Institute Beijing100072China School of Aerospace Engineering Huazhong Univerisity of Science and TechnologyWuhan430074China

The active protection system(APS),usually installed on the turret of armored vehicles,can significantly improve the vehicles’survivability on the battlefield by launching countermeasure munitions to actively intercept incoming threats.However,uncertainty over the launch angle of the countermeasure is increased due to angular disturbances when the off-road armored vehicle is moving over rough terrain.Therefore,accurate and comprehensive angular disturbance prediction is essential to the real-time monitoring of the countermeasure launch angle.In this paper,a deep ensemble learning(DEL)-based approach is proposed to predict the angular disturbances of the countermeasure launcher in the APS based on previous time-series information.In view of the intricate temporal attribute of angular disturbance prediction,the sampling information of historical time series measured by an inertial navigation device is adopted as the input of the developed DEL model.Then,the recursive multi-step(RMS)prediction strategy and multi-output(MO)prediction strategy are combined with the DEL model to perform the final angular disturbance prediction for the countermeasure launcher in the APS of a moving armored vehicle.The proposed DEL model is validated by using the different datasets from real experiments.The results reveal that this approach can be used to accurately predict angular disturbances,with the maximum absolute error of each DOF less than 0.1°.

关键词： prediction disturbance moving

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