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Characteristics and suppression of beam distortion in a high repetition rate nanosecond stimulated Brillouin scattering phase conjugation mirror

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High Power Laser Science and Engineering 2024年第2期12卷 69-78页

作者： Yifu Chen bowen Tan Duo Jin Bin Chen Zhenxu Bai Kun wang Yulei wang Zhiwei Lü School of Astronautics Harbin Institute of TechnologyHarbinChina Center for Advanced Laser Technology Hebei University of TechnologyTianjinChina Hebei Key Laboratory of Advanced Laser Technology and Equipment TianjinChina School of Energy and Environmental Engineering Hebei University of TechnologyTianjinChina

The stimulated Brillouin scattering phase conjugation mirror (SBS-PCM) based on liquid media is widely used in high-power laser systems due to its robust thermal load capacity, high energy conversion efficiency and improved beam quality. Nevertheless, with an increase in the pump repetition rate, thermally-induced blooming and optical breakdown can emerge, leading to distortions in the Stokes beam. In this study, we delved into the thermal effects in liquid SBS-PCMs employing hydrodynamic analysis, establishing a relationship between beam profile distortion and the thermal convection field. We calculated the temperature and convection velocity distribution based on the pump light parameters and recorded the corresponding beam profiles. The intensities of the beam profiles were modulated in alignment with the convection directions, reaching a velocity peak of 2.85 mm/s at a pump pulse repetition rate of 250 Hz. The residual sum of squares (RSS) was employed to quantify the extent of beam profile distortion relative to a Gaussian distribution. The RSS escalated to 7.8, in contrast to 0.7 of the pump light at a pump pulse repetition rate of 500 Hz. By suppressing thermal convection using a high-viscosity medium, we effectively mitigated beam distortion. The RSS was reduced to 0.7 at a pump pulse repetition rate of 500 Hz, coinciding with a twentyfold increase in viscosity, thereby enhancing the beam quality. By integrating hydrodynamic analysis, we elucidated and mitigated distortion with targeted solutions. Our research offers an interdisciplinary perspective on studying thermal effects and contributes to the application of SBS-PCMs in high-repetition-rate laser systems by unveiling the mechanism of photothermal effects.

关键词： beam profile high power high repetition rate stimulated Brillouin scattering phase conjugation mirror thermal convection

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A Predictive Energy Management Strategies for Mining Dump Trucks

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Energy Engineering 2024年第3期121卷 769-788页

作者： Yixuan Yu Yulin wang Qingcheng Li bowen Jiao College of Mechanical and Electrical Engineering Qingdao UniversityQingdao266071China

The plug-in hybrid vehicles(PHEV)technology can effectively address the issues of poor dynamics and higher energy consumption commonly found in traditional mining dump ***,plug-in hybrid electric trucks can achieve excellent fuel economy through efficient energy management strategies(EMS).Therefore,a series hybrid system is constructed based on a 100-ton mining dump truck in this *** inspired by the dynamic programming(DP)algorithm,a predictive equivalent consumption minimization strategy(P-ECMS)based on the DP optimization result is *** on the optimal control manifold and the SOC reference trajectory obtained by the DP algorithm,the P-ECMS strategy performs real-time stage parameter optimization to obtain the optimal equivalent factor(EF).Finally,applying the equivalent consumption minimization strategy(ECMS)realizes real-time *** simulation results show that the equivalent fuel consumption of the P-ECMS strategy under the experimentally collected mining cycle conditions is 150.8 L/100 km,which is 10.9%less than that of the common CDCS strategy(169.3 L/100 km),and achieves 99.47%of the fuel saving effect of the DP strategy(150 L/100 km).

关键词： Mining dump truck energy management strategy plug-in hybrid electric vehicle equivalent consumption minimization strategy dynamic programming

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Low power and high uniformity of HfOx-based RRAM via tip-enhanced electric fields

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Science China(Information Sciences) 2019年第10期62卷 164-170页

作者： Xiaokang LI Baotong ZHANG bowen wang Xiaoyan XU Yuancheng YANG Shuang SUN Qifeng CAI Shijie HU Xia AN Ming LI Ru HUANG Key Laboratory of Microelectronic Devices and Circuits (MOE) Institute of MicroelectronicsPeking University

In this paper, the HfOx-based resistive random access memory（RRAM） devices with sub-100 nm pyramid-type electrodes were fabricated. With the help of tip-enhanced electric field around the pyramid-type electrodes, it was experimentally demonstrated that the novel devices have better cycle-to-cycle variation control, lower forming/set voltage（1.97/0.7V） and faster switching speed（≤30 ns under 0.9V pulse） as well as better endurance reliability than conventional flat electrode resistive memory devices. In addition,the novel RRAM is experimentally demonstrated with independence of electrode number for the first time to present great potential in scaling down. This novel structure metal-oxide based RRAM will be suitable for the future low-power non-volatile memory application.

关键词： RRAM pyramid-type electrode variation reliability switching speed conducting filament

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Structure–performance relationship of Au nanoclusters in electrocatalysis:Metal core and ligand structure

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Carbon Energy 2024年第8期6卷 63-89页

作者： bowen Li Lianmei Kang Yongfeng Lun Jinli Yu Shuqin Song Yi wang The Key Lab of Low‐Carbon Chemistry&Energy Conservation of Guangdong Province PCFM LabSchool of Chemical Engineering and TechnologySchool of Materials Science and EngineeringSun Yat‐sen UniversityGuangzhouChina Department of Chemistry City University of Hong KongHong KongChina

Remarkable progress has characterized the field of electrocatalysis in recent decades,driven in part by an enhanced comprehension of catalyst structures and mechanisms at the *** precise metal nanoclusters,serving as exemplary models,significantly expand the range of accessible structures through diverse cores and ligands,creating an exceptional platform for the investigation of catalytic ***,ligand‐protected Au nanoclusters(NCs)with precisely defined core numbers offer a distinct advantage in elucidating the correlation between their specific structures and the reaction mechanisms in *** strategic modulation of the fine microstructures of Au NCs presents crucial opportunities for tailoring their electrocatalytic performance across various *** review delves into the profound structural effects of Au NC cores and ligands in electrocatalysis,elucidating their underlying mechanisms.A detailed exploration of the fundamentals of Au NCs,considering core and ligand structures,***,the interaction between the core and ligand structures of Au NCs and their impact on electrocatalytic performance in diverse reactions are *** the discourse,challenges and personal prospects are presented to guide the rational design of efficient electrocatalysts and advance electrocatalytic reactions.

关键词： Au nanoclusters core electrocatalytic performance ligand structures

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ROS-responsive hydrogels with spatiotemporally sequential delivery of antibacterial and anti-inflammatory drugs for the repair of MRSA-infected wounds

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Regenerative Biomaterials 2024年第1期3卷 119-131页

作者： bowen Qiao Jiaxin wang Lipeng Qiao Aziz Maleki Yongping Liang Baolin Guo Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Zanjan Pharmaceutical Nanotechnology Research Center(ZPNRC) Zanjan 45139-56184Iran Department of Orthopaedics The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061People’s Republic of China

For the treatment of MRSA-infected wounds,the spatiotemporally sequential delivery of antibacterial and anti-inflammatory drugs is a promising *** this study,ROS-responsive HA-PBA/PVA(HPA)hydrogel was prepared by phenylborate ester bond cross-linking between hyaluronic acid-grafted 3-amino phenylboronic acid(HA-PBA)and polyvinyl alcohol(PVA)to achieve spatiotemporally controlled release of two kinds of drug to treat MRSA-infected *** hydrophilic antibiotic moxifloxacin(M)was directly loaded in the *** hydrophobic curcumin(Cur)with anti-inflammatory function was first mixed with Pluronic F127(PF)to form Cur-encapsulated PF micelles(Cur-PF),and then loaded into the HPA *** to the different hydrophilic and hydrophobic nature of moxifloxacin and Cur and their different existing forms in the HPA hydrogel,the final HPA/M&Cur-PF hydrogel can achieve different spatiotemporally sequential delivery of the two *** addition,the swelling,degradation,self-healing,antibacterial,anti-inflammatory,antioxidant property,and biocompatibility of hydrogels were ***,in the MRSA-infected mouse skin wound,the hydrogel-treated group showed faster wound closure,less inflammation and more collagen *** experiments further confirmed that the hydrogel promoted better repair by reducing inflammation(TNF-a)and promoting vascular(VEGF)*** conclusion,this HPA/M&CurPF hydrogel that can spatiotemporally sequential deliver antibacterial and anti-inflammatory drugs showed great potential for the repair of MRSA-infected skin wounds.

关键词： MRSA-infected wounds spatiotemporally sequential delivery antibacterial anti-inflammatory

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Un hogar de bienestar para la gtmtti

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今日中国（西文版） 2022年第7期 28-29页

作者： wang bowen 不详

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China en accion

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今日中国（西文版） 2022年第8期 27-29页

作者： wang bowen 不详

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Xinjiang’s Cotton Industry Gets Smart

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China Today 2021年第8期70卷 28-30页

作者： wang bowen 不详

LOCATED in the northwest of China,Xinjiang Uygur Autonomous Region boasts long hours of sunshine and ample water for irrigation—making the region geographically ideal for growing *** grown in Xinjiang,which has good ... 详细信息

关键词： Xinjiang sunshine northwest

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Tourism Boosts Rural Revitalization in Ili

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China Today 2021年第8期70卷 31-33页

作者： wang bowen 不详

THEY say you never know how big China is until you come to Xinjiang,and never know how beautiful Xinjiang is until you come to *** in the Ili River Valley,west Xinjiang Uygur Autonomous Region,Ili Kazak Autonomous Prefecture boasts the magnificent Tianshan Mountains,vast grasslands,blue lakes,and romantic flower fields,attracting tens of thousands of domestic and foreign visitors every year.

关键词： Xinjiang Rural attracting

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El “618” mas dificil de la historia

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今日中国（西文版） 2022年第7期 54-55页

作者： wang bowen 不详

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