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Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution Condition

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Journal of Thermal Science 2025年第1期34卷 254-267页

作者： YAN Bowen WATERS Benjamin HAINES Andrew MCGHEE Mike HU Tiegang DENG Wei PU Yongxian ma Tianyu Powertrain Engineering R&D Center Chongqing Changan Automobile Co.Ltd. Changan UK R&D Centre Limited

In this study,a triple spark ignition scheme was first designed on a three-cylinder 1.5-L dedicated hybrid engine（DHE）.On this basis,the effect of different ignition modes on engine combustion and emission characteristics was studied,especially under high dilution *** results tested at 2000 r/min and 0.8 MPa BMEP（brake mean effective pressure） show that with highly increased in-cylinder flow intensity,using only passive prechamber（PPC） has a lower lean limit than that with single central spark plug（CSP）,thereby leading to slightly higher minimum fuel consumption and nitrogen oxides（NOx） *** side spark plugs（SSP）based on PPC can result in improved capability of lean limit extension and engine performance than ***,the improvement level is lower than that with triple spark plugs（TSP）.As the excess air ratio λincreases,the advantage of PPC and PPC with SSP in improving the combustion phasing compared with CSP gradually ***,the increasing tendency of their ignition delay and combustion duration is more *** added SSP based on PPC can effectively shorten the ignition delay of leaner mixture,but the combustion duration can be only slightly *** a result,under extremely lean condition,the advantage of PPC and PPC with SSP in terms of combustion characteristics over CSP becomes much *** contrast,the TSP ignition can achieve much shorter ignition delay and combustion duration simultaneously under this *** to the highest available dilution level,the TSP ignition achieves the lowest raw ***,it can also reduce the raw carbon monoxide（CO） and hydrocarbons（HC） emissions compared to CSP due to a more thorough combustion of the end gas *** on the excellent performance of TSP,the highest engine brake thermal efficiency（BTE） was further *** results show that with normal RON 92 fuel,the engine finally achieved 43.69% and 45.02% BTE under stochiometric mode with exhaust

关键词： dedicated hybrid engine high dilution condition NOx emissions passive prechamber thermal efficiency triple spark plug scheme

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Near-perfect replication on amorphous alloys through active force modulation based on machine learning/neural network parameter prediction

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 181-191页

作者： Senkuan Meng Zheng Wang Ruisong Zhu Ruijie Liu jiang ma Lina Hu Weihua Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of materials (Ministry of Education) School of Materials Science and Engineering Shandong University College of Mechatronics and Control Engineering Shenzhen University Songshan Lake materials Laboratory Institute of Physics Chinese Academy of Sciences

As a microforming technique, micro/nano-structural replication possesses advantages of high precision and efficiency. With the remarkable superplasticity in the supercooled liquid region, amorphous alloys or metallic glasses(MGs) are regarded as ideal materials for miniature fabrication. However, due to the intrinsic metastable nature of supercooled liquids, the design of imprinting processes for MGs poses a challenge. In the past, process parameters have largely relied on trial-and-error *** this work, a low-frequency active force modulation system is employed to apply a stable, precise, and real-time feedback stress field for imprinting of MG samples. Low-frequency vibrations can facilitate the filling of microstructures on the template surface by reducing the effective viscosity of the supercooled liquid. With the dataset composed of orthogonal experiments, a machine learning strategy based on back-propagation(BP) neural networks was utilized to construct a 3D parameter space for temperature, stress, and time, and to predict the corresponding filling ratio. Furthermore, the optimal combination of imprinting process parameters was identified, and its filling ratio was experimentally validated to reach as high as 0.94. The near-perfect replication of microstructures confirms the superiority of the active force modulation system and the data-driven strategy of machine learning-assisted parameter design. At the same time, this one-step microforming process provides a new approach to addressing the accuracy-cost trade-off dilemma in precision manufacturing.

关键词： metallic glass amorphous alloy microforming imprinting machine learning

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Bandgap characteristics analysis and graded design of a novel metamaterial for flexural wave suppression

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Applied mathematics and Mechanics(English Edition) 2025年第1期46卷 1-24页

作者： Fan YANG Zhaoyang ma Xingming GUO Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai University Shanghai Institute of Aircraft Mechanics and Control

A novel elastic metamaterial is proposed with the aim of achieving lowfrequency broad bandgaps and bandgap regulation. The band structure of the proposed metamaterial is calculated based on the Floquet-Bloch theorem, and the boundary modes of each bandgap are analyzed to understand the effects of each component of the unit cell on the bandgap formation. It is found that the metamaterials with a low elastic modulus of ligaments can generate flexural wave bandgaps below 300 Hz. Multi-frequency vibrations can be suppressed through the selective manipulation of bandgaps. The dual-graded design of metamaterials that can significantly improve the bandgap width is proposed based on parametric studies. A new way that can regulate the bandgap is revealed by studying the graded elastic modulus in the substrate. The results demonstrate that the nonlinear gradient of the elastic modulus in the substrate offers better bandgap performance. Based on these analyses, the proposed elastic metamaterials can pave the way for multi-frequency vibration control, low-frequency bandgap broadening, and bandgap tuning.

关键词： Vibration analysis

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Statistical measures of genetic differentiation of populations： Rationales, history and current states

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Current Zoology 2015年第5期61卷 886-897页

作者： liang ma Ya-jie ji De-Xing ZHANG Institute of Zoology Chinese Academy of Sciences Beijing 100101 China Institute of Applied mathematics Chinese Academy of Sciences Beijing 100190 China Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100101 China National Center for mathematics and Interdisciplinary Sciences Chinese Academy of Sciences Beijing 100190 China

Population differentiation is a fundamental process of evolution, and many evolutionary studies, such as population genetics, phylogeography and conservation biology, all require the inference of population differentiation. Recently, there has been a lot of debate over the validity of FST （and its analogue Gsr） as a measure for population genetic differentiation, notably since the proposal of the new index D in 2008. Although several papers reviewed or explored specific features of these statistical measures, a succinct account of this bewildering issue with an overall update appears to be desirable. This is the purpose of the present review. The available statistics generally fall into two categories, represented by Fsv and D, respectively. None of them is perfect in measuring population genetic differentiation. Nevertheless, they each have advantages and are valuable for current re- search. In practice, both indices should be calculated and a comparison of them can generate useful insights into the evolutionary processes that influence population differentiation. FsT （GsT） has some unique irreplaceable characteristics assuring its standing as the default measure for the foreseeable near future. Also, it will continue to serve as the standard for any alternative measures to contrast with. Instead of being anxious about making choice between these indices, one should pay due attention to the equili-brium status and the level of diversity （especially Hs） of the populations, since they largely sway the power of a given statistic to address a specific question. We provide a multi-faceted comparative summary of the various statistics, which can serve as a basic reference for readers to guide their applications [Current Zoology 61 （5）： 886-897, 2015].

关键词： Population structure and subdivision Coefficient of inbreeding Fixation index Gene identity Gene flow Non-equilibrium conditions Heterozygosity FST and selection

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Efficient and Stable Photoassisted Lithium‑Ion Battery Enabled by Photocathode with Synergistically Boosted Carriers Dynamics

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Nano-Micro Letters 2025年第3期17卷 440-454页

作者： Zelin ma Shiyao Wang Zhuangzhuang ma Juan Li Luomeng Zhao Zhihuan Li Shiyuan Wang Yazhou Shuang jiulong Wang Fang Wang Weiwei Xia jie jian Yibo He Junjie Wang Pengfei Guo Hongqiang Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072People’s Republic of China State Key Laboratory of Solidification Processing School of Materials Science and Engineering DepartmentNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringNational Ministry of EducationShaanxi Normal UniversityXi’an 710119People’s Republic of China

Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries(PLIBs),while there is always a request on fast carrier transport in electrochemical active *** work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic *** employed in PLIBs,it was found effective for synchronously enhanced photocharge separation and transport in light charging ***,experimental photon spectroscopy,finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO_(2),as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky *** from these merits,several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set,including the capacity of 276 mah g^(−1)at 0.2 A g^(−1)under illumination,photoconversion efficiency of 1.276%at 3 A g^(−1),less capacity and Columbic efficiency loss even through 200 *** results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.

关键词： Photoassisted lithium-ion batteries Bulk heterojunction Carrier dynamics TiO2 nanofiber Plasmonic metal nanocrystals

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回注水中固体颗粒对储层伤害的实验研究

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当代化工 2021年第10期50卷 2344-2349页

作者：徐传雨崔东迪刘正陈玲马继良中石化胜利油田分公司石油工程技术研究院东营257000 中石化胜利油田分公司滨南采油厂滨州256606

回注水中的悬浮固体颗粒进入储层导致储层渗透率降低,而较为严苛的水质要求会增加回注水处理的经济成本,研究不同渗透率储层回注水中悬浮固体颗粒的回注界限具有重要意义。以孤岛油田X区块中高渗油藏为例,基于采出液中悬浮固体颗粒质量... 详细信息

回注水中的悬浮固体颗粒进入储层导致储层渗透率降低,而较为严苛的水质要求会增加回注水处理的经济成本,研究不同渗透率储层回注水中悬浮固体颗粒的回注界限具有重要意义。以孤岛油田X区块中高渗油藏为例,基于采出液中悬浮固体颗粒质量浓度和粒径分析,通过岩心流动实验研究不同粒径、质量浓度的悬浮固体颗粒溶液通过渗透率不同的人造岩心时对岩心渗透率造成的损伤,并分析注入速度对上述结果的影响。结果表明:注入速度对悬浮固体颗粒溶液侵入岩心的伤害影响较小;悬浮固体颗粒对侵入储层的伤害程度随着岩心渗透率增大而降低;对于同一级别渗透率的岩心,固体颗粒质量浓度越高、粒径越大,对侵入储层的伤害程度越严重。最终通过最小曲率插值法对实验结果进行处理,得到了适用于孤岛X区块不同渗透率储层的悬浮固体颗粒溶液的注入界限,对提高油田注水效果有重要指导意义。

关键词：回注水悬浮固体颗粒储层伤害界限实验

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Constructing Donor–Acceptor‑Linked COFs Electrolytes to Regulate Electron Density and Accelerate the Li^(+)Migration in Quasi‑Solid‑State Battery

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Nano-Micro Letters 2025年第1期17卷 456-471页

作者： Genfu Zhao Hang ma Conghui Zhang Yongxin Yang Shuyuan Yu Haiye Zhu Yongjiang Sun Hong Guo School of materials and Energy International Joint Research Center for Advanced Energy Materials of Yunnan ProvinceYunnan UniversityKunming 650091People’s Republic of China Yunnan Yuntianhua Co. LtdR&D CenterKunming 650228People’s Republic of China Southwest United Graduate School Kunming 650091People’s Republic of China

Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal *** study reports a high-performance solid-state electrolyte thorough D–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer *** other reported COFbased solid-state electrolyte,the developed concept with D–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal *** introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and N-based *** is ascribed to outstanding D–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)***,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through D–A system.

关键词： Electronic modulation engineering Donor-acceptor-linked covalent organic frameworks Quasi-solid-state Li metal battery

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微探头超声内镜结合内镜下黏膜切除术或内镜下黏膜整片切除术诊断治疗胃黏膜隆起性病变

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中国卫生检验杂志 2018年第4期28卷 441-443页

作者：陈明彤李敏马骥杨周亮应丽园永康市第一人民医院消化内科浙江永康321300

目的评估微探头超声内镜对胃黏膜隆起性病变的诊断价值及指导选择不同微创手术方案的作用。方法选取2014年11月-2016年11月在本院行微探头超声内镜检查诊断为胃黏膜隆起性病变患者182例,行EMR或ESD并进行病理检查。结果 182例胃黏膜隆... 详细信息

目的评估微探头超声内镜对胃黏膜隆起性病变的诊断价值及指导选择不同微创手术方案的作用。方法选取2014年11月-2016年11月在本院行微探头超声内镜检查诊断为胃黏膜隆起性病变患者182例,行EMR或ESD并进行病理检查。结果 182例胃黏膜隆起性病变,息肉、间质瘤、脂肪瘤、平滑肌瘤和神经内分泌瘤是主要病变。微探头超声内镜检查对脂肪瘤的灵敏度最高为100.00%,其次是神经内分泌瘤、间质瘤、息肉;但对平滑肌瘤的灵敏度仅为43.75%,诊断效能较差。微探头超声内镜对来源于固有肌层病变诊断错误率较高,说明微探头超声来源于固有肌层的低回声病变诊断效率比较差。起源于固有肌层的病变术中出现出血和穿孔并发症的发生率明显高于黏膜下层和黏膜肌层。结论微探头超声内镜检查可以对胃黏膜隆起性病变做出较准确的诊断,可作为内镜手术前的常规术前检查。

关键词：微探头超声内镜诊断价值内镜下黏膜切除术内镜下黏膜整片切除术并发症

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Effect of hydrogen-storage pressure on the detonation characteristics of emulsion explosives sensitized by glass microballoons

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Defence Technology（防务技术） 2022年第5期18卷 747-754页

作者： ji-ping Chen Hong-hao ma Yi-xin Wang liang-liang Huang Zhao-wu Shen CAS Key Laboratory of Mechanical Behavior and Design of materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefeiAnhuiPR China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefeiAnhuiPR China

In this study,hydrogen-storage glass microballoons were introduced into emulsion explosives to improve the detonation performance of the *** effect of hydrogen-storage pressure on the detonation characteristics of emulsion explosives was systematically *** velocity experiments shows that the change of sensitizing gas and the increase of hydrogen pressure have different effects on the detonation *** experimental parameters of underwater explosion increase first and then decreases with the increase of hydrogen *** decrease of these parameters indicates that the strength of glass microballoons is the limiting factor to improve the detonation performance of hydrogen-storage emulsion *** with the traditional emulsion explosives,the maximum peak pressure of shock wave of hydrogen-storage emulsion explosives increases by 10.6%at 1.0 m and 10.2%at 1.2 m,the maximum values of shock impulse increase by 5.7%at 1.0 m and 19.4%at 1.2 *** stored hydrogen has dual effects of sensitizers and energetic additives,which can improve the energy output of emulsion explosives.

关键词： Emulsion explosives Hydrogen-storage pressure Glass microballoons Underwater explosion

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基于原位交联增容策略的增强PLA/NR共混物界面相容性和发泡性能研究

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陕西科技大学学报 2025年第1期43卷 73-80,100页

作者：王广静邵亮苏晨阳马春燕姬占有陕西科技大学化学与化工学院中国轻工业轻化工助剂重点实验室陕西西安710021

聚乳酸(PLA)是目前最具发展潜力的生物材料之一,但其韧性差,极大的限制了在塑料领域的发展与应用.已有研究发现天然橡胶(NR)的引入可以改善其韧性差的缺陷,但二者为不相容体系,发泡性能差.因此,本文基于原位交联增容原理,采用1,4-双(叔... 详细信息

聚乳酸(PLA)是目前最具发展潜力的生物材料之一,但其韧性差,极大的限制了在塑料领域的发展与应用.已有研究发现天然橡胶(NR)的引入可以改善其韧性差的缺陷,但二者为不相容体系,发泡性能差.因此,本文基于原位交联增容原理,采用1,4-双(叔丁基过氧异丙基)苯(BIPB)增强PLA和NR的界面相容性,并以超临界二氧化碳(scCO_(2))发泡技术制备了PLA/NR复合发泡材料.探究了不同BIPB含量对复合材料界面相容性、韧性及复合材料发泡行为的影响.结果表明,BIPB的引入显著增强了PLA/NR复合材料的相容性、韧性及发泡性能.当BIPB含量为0.25 phr时,PLA/NR复合材料的断裂伸长率从原来的25.75%增加到35.24%,提升了1.37倍;表观密度从初始的0.565 g·cm^(-3)下降至0.373 g·cm^(-3);平均泡孔尺寸从7.5μm下降至5.0μm.

关键词：聚乳酸天然橡胶 1,4-双(叔丁基过氧异丙基)苯超临界发泡相容性

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