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Tuning the nucleation and decomposition of Li2O_(2) by fluorine-doped carbon vesicles towards high performance Li-O_(2) batteries

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Journal of Energy Chemistry 2022年第7期31卷 614-622,I0015页

作者： shiyu ma Hongchang Yao Zhongjun Li Qingchao Liu Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina

Li-O_(2) batteries provide an attractive and potential strategy for energy conversion and storage with high specific energy ***,large over-potential in oxygen evolution reactions (OER) caused by the decomposition obstacles of Li_(2)O_(2) seriously impedes its electrochemical ***,a novel N,O,S and F co-doping vesicular carbon was prepared by self-template pyrolysis method and used in LiO_(2) battery to tune the nucleation and decomposition of Li_(2)O_(2).The introduction of F in the carbon matrix with suitable content can regulate the adsorption of intermediates,through which the morphology of Li_(2)O_(2) can be controlled to film,favorable to its decomposition in charge *** cathode based on the optimized F doped carbon vesicle exhibits improved electrochemical performances including a low over-potential,large capacity and a long-term *** functional theory (DFT) results show that F and C in C–F bond hasve a strong interaction to Li and O in Li_(2)O_(2),respectively,which can enhance the transfer of electrons from Li_(2)O_(2) to the carbon matrix to generate hole polaron and thus accelerate the delithiation and decomposition of Li_(2)O_(2).This work provides a new sight into understanding the mechanism of nucleation and decomposition of Li_(2)O_(2) for the development of high-performance Li-O_(2) batteries.

关键词： Li-O_(2)batteries F-doped carbon vesicles DFT Li2O_(2)nucleation and decomposition

RNA nanostructure transformation into DNA ones

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Nano Research 2022年第10期15卷 9199-9203页

作者： Jiazhen Lyu shiyu ma Chong Zhang Zhen Huang Key Laboratory of Bio-resource and Eco-environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610065China The State Key Laboratory of Biotherapy West China HospitalSichuan UniversityChengdu 610041China SeNA Research Institute Chengdu 610000China

RNAs and their assemblies can form diverse nano-structures and nano-shapes,offering various biological ***,by simply mimicking RNA sequences,DNAs cannot normally form the corresponding nanostructures,which makes the natureinspired transformations and designs *** understand the possible designs and connections between related RNA and DNA nano-shapes,herein we have reported several DNA squares transformed and derived from an RNA assembled square,by gradually replacing RNA with DNA *** have found that there were key RNA nucleotides:Their presences maintained the square,while their absences disrupted ***,we have revealed that as long as the conditions of higher ionic strengths or longer duplexes were included,the square RNA assembly could be completely replaced with DNA nucleotides,still offering the stable DNA *** experimental results have demonstrated that similar RNA nanostructure can be easily transformed into DNA ones via designing and increasing ionic strengths or duplex lengths.

关键词： RNA nanostructure DNA square assembly molecular transformation ionic strength duplex length

Anti-wear and friction performance of ZrO_2 nanoparticles as lubricant additive

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Particuology 2010年第5期8卷 468-472页

作者： shiyu ma Shaohua Zheng Duxia Cao Hongna Guo School of materials and Engineering University of Jinan Jinan Shandong 250022 China

The surface of ZrO2 nanoparticles was modified with silane coupling agent KH-560 by dispersing the nanoparticles in 20# machine oil. The tribological performance of the 20# machine oil with ZrO2 nanoparticles was evaluated by a four-ball tester and a thrust-ring machine. The loss of the thrust-ring weight was measured by an electronic balance with a precision of 0.0001 g. The worn surface was examined under a metallographic microscope with 400-times magnification. The results showed that the average friction coefficient decreased by 27.34%, and that the weight loss of the thrust-ring indicated no wear or negative wear, the wear loss after six loads tests being -0.0163 g. The anti-wear （AW） and reducing friction （RF） abilities of the oil with ZrO2 nanoparticles addition were considerably improved, maximizing at an additive concentration of 0.5 wt%.

关键词： AdditiveZrO2 nanoparticlesBoundary lubricationFriction and wear

Regulating the nucleation of Li_(2)CO_(3) and C by anchoring Li-containing carbonaceous species towards high performance Li-CO_(2) batteries

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Journal of Energy Chemistry 2022年第2期31卷 472-479页

作者： shiyu ma Youcai Lu Hongchang Yao Yubing Si Qingchao Liu Zhongjun Li Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina

Li-CO_(2) batteries provide an attractive and potential strategy for CO_(2) utilization as well as energy conversion and storage with high specific energy ***,the poor reversibility caused by the decomposition obstacles of Li_(2)CO_(3) and C products is still a challenge for Li-CO_(2) batteries,which seriously influences its electrochemical ***,a free-standing MnOOH arrays cathode has been prepared and employed in Li-CO_(2) battery,which realizes a great improvement of electrochemical performances by adjusting the discharge products *** coupled with theoretical calculations verifies that the formation of Li-containing carbonaceous species(LiCO_(2),LiCO and Li_(2) CO_(3))bonded with MnOOH through Li ion regulates the nucleation behavior of Li_(2)CO_(3) and C,making them grown on MnOOH *** fine Li_(2) CO_(3) grains(with a size about 5 nm)embedded into carbon matrix greatly enlarges the contact interface between them,facilitating the transmission of electrons through the discharge products and finally improves CO_(2) evolution *** ingenious design strategy of regulating discharge products distribution to improve electrochemical performances provides a promising way to develop advanced Li-CO_(2) batteries.

关键词： Li-CO_(2)battery MnOOH arrays Interface Discharge mechanism

Enhancing the process of CO_(2) reduction reaction by using CTAB to construct contact ion pair in Li-CO_(2) battery

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Chinese Chemical Letters 2022年第6期33卷 2933-2936页

作者： shiyu ma Youcai Lu Hongchang Yao Qingchao Liu Zhongjun Li Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China

Aprotic Li-CO_(2)batteries have attracted growing interest due to their high theoretical energy density and its ability to use green house gas CO_(2)for energy ***,the poor ability of activating CO_(2)in organic electrolyte often leads to the premature termination of CO_(2)reduction reaction(CO_(2)RR)*** in this work,cetyl trimethyl ammonium bromide(CTAB)was introduced into a dimethyl sulfoxide(DMSO)based Li-CO_(2)battery for the first time to enhance the CO_(2)*** improved electrochemical performances,including reduced discharge over-potential and increased discharge capacity,can be achieved with the addition of *** initio molecular dynamics(AIMD)simulations show that quaternary ammonium group CTA^(+) can accelerate CO_(2)reduction process by forming more stable contact ion pair(CIP)with CO_(2)^(–),reducing the energy barrier for CO_(2)RR,thus improving the CO_(2)reduction *** addition,adding CTA^(+) is also favorable for the solution-phase growth of discharge products because of the improved migration ability of stable CTA^(+)-CO_(2)^(–) CIP in the electrolyte,which is beneficial for improving the utilization ratio of *** work could facilitate the development of CO_(2)RR by providing a novel understanding of CO_(2)RR mechanism in organic system.

关键词： CO_(2)reduction reaction Li-CO_(2)battery Quaternary ammonium additive Contact ion pair AIMD

In-situ X-ray computed tomography tensile tests and analysis of damage mechanism and mechanical properties in laser powder b e d fused Invar 36 alloy

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Journal of materials Science & Technology 2024年第8期175卷 29-46页

作者： Qidong Yang Shuo Yang shiyu ma Junhan Zhou Ye Zhou Rongzheng Huang Kai Wei Zhaoliang Qu Xujing Yang Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha 410082China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Precision manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China

Laser powder bed fusion(LPBF)is a potential additive manufacturing process to manufacture Invar 36 alloy components with complicated *** it inevitably introduces specific microstructures and pore defects,which will further influence the mechanical ***,aiming at exploring the LPBF process-related microstructures and pore defects,and especially their influences on the damage mechanism and mechanical properties,Invar 36 alloy was manufactured by LPBF under designed different laser scanning *** microstructure observations reveal that higher scanning speeds lead to equiaxed and short columnar grains with higher dislocation density,while lower scanning speeds result in elongated columnar grains with lower dislocation *** pore defects analyzed by X-ray computed tomography(XCT)suggest that the high laser scanning speed gives rise to numerous lamellar and large lack-of-fusion(LOF)pores,and the excessively low laser scanning speed produces relatively small keyhole pores with high ***,the insitu XCT tensile tests were originally performed to evaluate the damage evolution and failure ***,high laser scanning speed causes brittle fracture due to the rapid growth and coalescence of initial lamellar LOF pores along the scan-ning *** laser scanning speed induces ductile fracture originating from unstable depressions in the surfaces,while metallurgical and keyhole pores have little impact on damage ***,the process-structure-property correlation is *** presence of high volume fraction of lamel-lar LOF pores,resulting from high scanning speed,leads to inferior yield strength and ***,specimens without LOF pores exhibit larger grain sizes and lower dislocation density at decreased scanning speeds,slightly reducing yield strength while slightly enhancing *** understanding lays the foundation for widespread applications of LPBF-processed Invar 36 alloy

关键词： Invar 36 alloy Laser powder bed fusion Microstructure Pore defects Mechanical property X-ray tomography in-situ tensile test

Exploration of compatibility rules and discovery of active ingredients in TCM formulas by network pharmacology

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Chinese Herbal Medicines 2024年第4期16卷 572-588页

作者： Yishu Liu Xue Li Chao Chen Nan Ding shiyu ma Ming Yang Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shanghai 200032China Ruijin Hospital Affiliated to Shanghai Jiaotong University Shanghai 200025China

Network pharmacology is an interdisciplinary field that utilizes computer science, technology, and biological networks to investigate the intricate interplay among compounds/ingredients, targets, and diseases. Within the realm of traditional Chinese medicine(TCM), network pharmacology serves as a scientific approach to elucidate the compatibility relationships and underlying mechanisms of action in TCM formulas. It facilitates the identification of potential active ingredients within these formulas, providing a comprehensive understanding of their holistic and systematic nature, which aligns with the holistic principles inherent in TCM theory. TCM formulas exhibit complexity due to their multicomponent characteristic, involving diverse targets and pathways. Consequently, investigating their material basis and mechanisms becomes challenging. Network pharmacology has emerged as a valuable approach in TCM formula research, leveraging its holistic and systematic advantages. The manuscript aims to provide an overview of the application of network pharmacology in studying TCM formula compatibility rules and explore future research directions. Specifically, we focus on how network pharmacology aids in interpreting TCM pharmacological theories and understanding formula ***, we elucidate the process of utilizing network pharmacology to identify active ingredients within TCM formulas. These findings not only offer novel research models and perspectives for integrating network pharmacology with TCM theory but also present new methodologies for investigating TCM formula compatibility. All in all, network pharmacology has become an indispensable and crucial tool in advancing TCM formula research.

关键词： active ingredients compatibility rules molecular mechanism network analysis network pharmacology systems biology target prediction traditional chinese medicine

HPLC Fingerprint Combined with Self-reference Method and Between-group Method for Pattern Recognition of the Dissolution of Tall Gastrodia Capsule

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HPLC Fingerprint Combined with Self-reference Method and Bet...

第十四届全国中药和天然药物学术研讨会

作者： shiyu ma Lan Shen Xiao Lin Shanghai University of Traditional Chinese Medicine

＜正＞Gastrodiae Rhizoma（Chinese name:Tianma）is the dried rhizomes of Gastrodia elata Blume（Orchidaceae）and extremely valuable Traditional Chinese Medicine（TCM）.Nowadays,with the development of modern pharmaceutical technology,it were crushed,sterilized and packaged into capsule as the Tall gastrodia *** to its precious herbal and

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国外钻井现场HSE管理的实践与认识

天然气工业 2005年第4期25卷 185-187页

作者：马时雨杨民育中国石油GW62钻井队四川石油管理局川东钻探公司

根据健康安全环保(HSE)管理原理,结合委内瑞拉钻井现场的管理实践,提出了现场HSE管理目标、基本原则和现场作业HSE检查监督的规范,使HSE现场管理能够做到目标明确,管理到位,责权明晰,措施有力。同时,介绍了钻井现场以项目经理总负责,HS... 详细信息

根据健康安全环保(HSE)管理原理,结合委内瑞拉钻井现场的管理实践,提出了现场HSE管理目标、基本原则和现场作业HSE检查监督的规范,使HSE现场管理能够做到目标明确,管理到位,责权明晰,措施有力。同时,介绍了钻井现场以项目经理总负责,HSE监督员为龙头的全员管理网络体系及其HSE管理具体做法。这样,可以使HSE管理避免外界和人为因素的干扰,成为钻井工程作业必不可少的环节。文章具有较强的实践性、操作性,对国内开展现场HSE监督具有借鉴和参考价值。

关键词：外国钻井工程 HSE管理体系健康安全环境管理体系安全生产安全监察工作