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Thermodynamic performance modeling,optimization and numerical simulation of RBCC ejector mode

Propulsion and Power Research 2024年第2期13卷 207-232页

作者： Feiteng Luo zhenming Qu Yaosong Long Wenjuan Chen Jinli Hou Baoxi Wei School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China Science and Technology of Scramjet Laboratory Beijing Power Machinery Research InstituteBeijing 100074China

Ejector mode is a unique and critical phase of wide-range rocket-based combined cycle(RBCC)*** this paper,a quasi-one-dimensional thermodynamic performance modeling method,with more detailed model treatments for the inlet-diffuser system,pri-mary/secondaryﬂow interaction,and pressure feedback matching,was developed for operating characteristics studies and multi-objective optimization analysis of the ejector mode of an actual RBCC engine.A series of three-dimensional simulations of separate inlet and fullﬂowpath was completed to validate the modeling study and provide further insight into the operating *** primary/secondary equilibrium pressure ratio functions a signiﬁcant effect on ejector mode performance,a higher performance augmentation can be obtained by lower rocket pressure ratio,larger mixing section area ratio,smaller throttling throat and higher equivalence ratio,within an appropriate *** positive performance augmentation can be realized at lowﬂight Mach conditions,the coordination and trade-off relationships between speciﬁc im-pulse,performance augmentation ratio and thrust-to-area ratio during ejector mode are present by the Pareto-front from MOP *** is further veriﬁed by CFD simulation that,the operating back-pressure at the exit of inlet-diffuser system functions a decisive inﬂuence on the airbreathing characteristics,the pressure feedback and matching should be well-controlled for secondaryﬂowrate and performance *** thermodynamic modeling analysis re-sults are basically consistent with those of numerical simulation,to validate the rationality and effectiveness of the modeling method.

关键词： Rocket-based combined cycle(RBCC) Ejector mode Performance modeling Optimization Numerical simulation

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Multi-Component Resource Recycling from Waste Light-Emitting Diode Under Hydrothermal Condition:Plastic Package Degradation,Speciation of Nano-TiO_(2),and Environmental Impact Assessment

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Engineering 2024年第8期39卷 253-261页

作者： Yongliang Zhang Lu Zhan zhenming Xu School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Light emitting diodes(LEDs)have accounted for most of the lighting market as the technology matures and costs continue to *** a new type of e-waste,LED is a double-edged sword,as it contains not only precious and rare metals but also organic packaging *** previous studies,LED recycling focused on recovering precious and strategic metals while ignoring harmful substances such as organic packaging *** crushing and other traditional methods,hydrothermal treatment can provide an environment-friendly process for decomposing packaging *** work developed a closed reaction vessel,where the degradation rate of plastic polyphthalamide(PPA)was close to 100%,with nano-TiO_(2)encapsulated in plastic PPA being efficiently recovered,while metals contained in LED were also recycled ***,the role of water in plastic PPA degradation that has been overlooked in current studies was explored and speculated in detail in this *** impact assessment revealed that the proposed recycling route for waste LED could significantly reduce the overall environmental impact compared to the currently published *** the developed method could reduce more than half the impact of global ***,this research provides a theoretical basis and a promising method for recycling other plastic-packaged e-waste devices,such as integrated circuits.

关键词： Waste LED Hydrothermal treatment Recycling Plastic PPA degradation Packaging materials

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奥氏体锰钢在非强烈冲击下使用寿命提高的研究

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钢铁 1983年第2期18卷 42-48页

作者：何镇明姜启川刘文泉吉林工业大学吉林工学院

本文研究了不同锰、碳、铬含量,孕育处理,水韧处理和时效硬化处理对奥氏体锰钢显微组织和机械性能的影响,着重探讨了在非强烈冲击情况下奥氏体锰钢的加工硬化能力、抗变形能力和耐磨性.试验结果表明:Mn7Cr2和Mn9Cr2两种奥氏体锰钢的冲... 详细信息

本文研究了不同锰、碳、铬含量,孕育处理,水韧处理和时效硬化处理对奥氏体锰钢显微组织和机械性能的影响,着重探讨了在非强烈冲击情况下奥氏体锰钢的加工硬化能力、抗变形能力和耐磨性.试验结果表明:Mn7Cr2和Mn9Cr2两种奥氏体锰钢的冲击值分别为8～1O公斤力·米/厘米~2和13～14公斤力·米/厘米~2;与Mn13钢相比,在非强烈冲击情况下的加工硬化率提高20～30%以上,原始硬度HB提高40～60个单位,屈服强度提高15kgf/mm~2以上.在非强烈冲击工况下,Mn7Cr2和IMn9Cr2钢的使用寿命高于Mn13钢.

关键词：奥氏体晶粒度细化晶粒铬含量奥氏体锰钢水韧处理加工硬化率硬化能力冲击值冲击韧性表面硬度高锰钢夹杂物碳氮化物孕育处理第二相粒子 Mn 使用寿命

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NODULARIZATION OF CARBIDE IN AS-CAST WEAR-RESISTANT MANGANESE STEEL

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Acta Metallurgica Sinica(English Letters) 1990年第10期3卷 287-288页

作者： JIANG Qichuan he zhenming YAN Jiulin CUI Donghuan WANG Shoushi Jilin University of Technology,Changchun,China JIANG Qichuan Associate Professor,Faculty of Casting Technology,Jilin University of Technology,Changchun 130025,China

The needle-like and network carbides in as-cast high carbon wear-resistant manganese steels will be nodularized and dispersed,by a large majority,in austenite aider modifying treatment with Mg system *** impact toughness of the steels is significantly improved and the hardness is also increased to a certain *** a result,the steels can be used in as-casted state without any heat treatment and their wear resistance can be greatly enhanced.

关键词： Mg modification manganese steel nodularized carbide

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In situ Preparation and Visible-light-driven Photocatalytic Degradation Performance of Nano 3C-SiC@Multilayer Graphene Oxide heterostructure

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Chemical Research in Chinese Universities 2024年第3期40卷 536-547页

作者： YANG Xiaodan GUO Ziqi XU Yichen LI Ziliang ZHOU Yangtao YANG zhenming ZHOU Zishuai GAO Yong ZHANG Jinsong Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016P.R.China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123P.R.China Shenyang SCIENCREAT Chemicals Co. Ltd.Shenyang 110144P.R.China School of Materials Science and Engineering Northeastern UniversityShenyang 110819P.R.China

Nano 3C-SiC@multilayer graphene oxide(NS@MGO)heterostructure was in situ prepared by carbothermal reduction of pyrolyzed precursor composed of highly dispersed cured phenolic resin and silicon dioxide derived from tetraethyl *** heterojunction interface,number of layers of MGO,and defect content in graphene are the three most important factors for promoting photocatalytic *** contact between 3C-SiC nanograins and MGO layers facilitates the photogenerated electrons to migrate across the heterojunction interface and avoid the formation of SiO_(2) nanolayers on the surface of SiC *** number of MGO layers is supposed to be less than ten instead of over-thick *** concentrations of oxygenated components,considered the defect contents,decrease with the increase of sintering temperature for NS@MGO 0.175-T-150,and relative carbon content in the multilayer graphene *** to the heterostructures,properties,and photocatalytic reaction performance of the NS@MGO materials,the highest photocatalytic kinetic rate constant of 0.00891/min for NS@MGO 0.175-1500-150 shows that the significant enhancement in photocatalytic degradation activity under visible light(>420 nm)irradiation is ascribed to the advantageous synergistic effects between the nano 3C-SiC particles and the direct contact multilayer graphene oxide with appropriate layers and sufficient oxygen content of 3.51%(atomic fraction)in MGO.

关键词： Photocatalysis Multilayer graphene oxide Nano 3C-SiC Visiblelight degradation

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长江流域生态环境质量的时空演变特征及其驱动因素

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水土保持通报 2023年第2期43卷 277-284,302页

作者：刘华东何贞铭郭琛长江大学地球科学学院湖北武汉430100

[目的]探究2001—2021年长江不同子流域生态环境质量动态变化及其主导驱动因素,以期为长江流域生态环境保护与经济发展战略的协调发展提供理论依据。[方法]基于MODIS数据提取了2001—2021年5—11月长江流域遥感生态指数(remote sensing ... 详细信息

[目的]探究2001—2021年长江不同子流域生态环境质量动态变化及其主导驱动因素,以期为长江流域生态环境保护与经济发展战略的协调发展提供理论依据。[方法]基于MODIS数据提取了2001—2021年5—11月长江流域遥感生态指数(remote sensing ecological index,RSEI),并基于RSEI分析了长江流域近21 a来生态环境质量动态及其驱动因素。[结果]①长江流域中下游生态质量高于上游,南部高于北部。除2006年外,生态质量在中等级以上的面积占80%以上,整体生态水平较好。②生态环境质量变化整体以稳定变化为主,呈上升趋势的区域有乌江、太湖水系、宜宾至宜昌、宜宾至湖口、金沙江流域。③RSEI变化的主要驱动因素为湿度指标,其次为温度指数。④生态环境质量受到风速的正影响较大。气温升高会导致长江流域生态环境质量变差,但在金沙江流域、鄱阳湖流域、嘉陵江流域和湖口及以下干流地区气温升高有利于生态环境质量改善。⑤降水增多有利于大部分地区生态环境质量改善。[结论]2001—2021年流域生态环境质量整体以不变趋势为主,但嘉陵江流域生态呈现退化现象需要引起政府重视,尽快提出一系列生态修复措施,防止其生态环境进一步恶化。

关键词：生态质量遥感生态指数地形因子气候长江流域

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ZIF-8 coated gold nanospheres: A multi-responsive drug delivery system promoting the killing effect of photothermal therapy against osteosarcoma cells

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Nano Research 2024年第3期17卷 1772-1784页

作者： Miao Lei Weiye Cai Luetao Zou Bin Yu Lin Chen Yang Cao Shanlin Xiang Chao Song Jiandu Lei Wei Jiang zhenming Hu Department of Orthopedics Orthopedic Laboratory of Chongqing Medical UniversityThe First Affiliated Hospital of Chongqing Medical UniversityNo.1 Youyi RoadChongqing 400010China The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University Luzhou 646699China Department of Orthopedics The Third Affiliated Hospital of Chongqing Medical UniversityChongqing 400010China Department of Radiology The First Affiliated Hospital of Chongqing Medical UniversityNo.1 Youyi RoadChongqing 400010China Department of Orthopedics Chongqing University Three Gorges HospitalChongqing 404000China Department of Geriatrics The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550025China Beijing Key Laboratory of Lignocellulosic Chemistry College of Material Science and TechnologyBeijing Forestry UniversityBeijing 100083China

Photothermal therapy(PTT)has been widely used in the treatment of tumors,but its efficacy is greatly limited by the inability of precise drug delivery and the increase of heat shock proteins(HSPs)caused by high *** article describes a therapeutic strategy to enhance PTT with starvation therapy in conjunction with ferroptosis mechanism.A nanoparticle platform ZIF-8@GA was constructed by wrapping together glucose oxidase(GOX)and gold nanospheres(AuNPs)loaded with dihydroartemisinin(DHA)with zeolitic imidazolate framework-8(ZIF-8).This platform can take advantage of the micro-environment of osteosarcoma(OS)cells,featuring low pH and high reactive oxygen species(ROS),for precision drug *** can effectively catalyze glucose to produce gluconic acid and H_(2)O_(2),and DHA can also induce ROS production in OS *** produced by GOX and DHA can further generate lipid peroxidation(LPO)and lead to ferroptosis of OS *** the same time,ROS and LPO produced can inhibit the expression of HSPs,thereby increasing the therapeutic effect of *** vitro experiments show that the nanoparticles are pH and ROS responsive.1μg/mL GOX combined with 0.2μg/mL DHA promotes ferroptosis of OS cells,and increases the killing effect of near-infrared(NIR)on OS *** in vivo experiments showed that the nano drug-delivery platform combined with PTT can effectively inhibit the growth of OS ***,this study provides a new idea for the treatment of OS with biomaterials combined with various treatment methods.

关键词： zeolitic imidazolate framework-8(ZIF-8) gold nanospheres(AuNPs) photothermal therapy(PTT) starvation therapy ferroptosis

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Ti合金在人工体液中的电化学腐蚀动力学参数

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特种铸造及有色合金 2002年第6期22卷 5-7页

作者：张新平于思荣何镇明刘耀辉吉林大学

采用电化学方法测定了不同成分的Ti Fe Mo Mn Nb Zr合金在Hank’s人工模拟体液中的阳极化曲线。通过回归拟合方法得到了各成分组合的腐蚀动力学参数。采用BP神经网络系统建立了Fe ,Mn ,Zr ,Mo ,Nb元素的成分组合与腐蚀动力学参数之间的... 详细信息

采用电化学方法测定了不同成分的Ti Fe Mo Mn Nb Zr合金在Hank’s人工模拟体液中的阳极化曲线。通过回归拟合方法得到了各成分组合的腐蚀动力学参数。采用BP神经网络系统建立了Fe ,Mn ,Zr ,Mo ,Nb元素的成分组合与腐蚀动力学参数之间的非线性关系及各元素质量分数与腐蚀速度的关系 ,并通过试验进行了验证。

关键词：钛合金电化学腐蚀动力学参数人工体液神经网络回归分析牙科材料

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ImSpiRE: image feature-aided spatial resolution enhancement method

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Science China Life Sciences 2024年

作者： Yuwei Hua Yizhi Zhang zhenming Guo Shan Bian Yong Zhang State Key Laboratory of Cardiovascular Diseases and Medical Innovation Center Institute for Regenerative Medicine Department of Neurosurgery Shanghai East Hospital Shanghai Key Laboratory of Signaling and Disease Research Frontier Science Center for Stem Cell Research School of Life Sciences and Technology Tongji University

The resolution of most spatially resolved transcriptomic technologies usually cannot attain the single-cell level, limiting their applications in biological discoveries. here, we introduce ImSpiRE, an image feature-aided spatial resolution enhancement method for in situ capturing spatial transcriptome. Taking the information stored in histological images, ImSpiRE solves an optimal transport problem to redistribute the expression profiles of spots to construct new transcriptional profiles with enhanced resolution, together with extending the gene expression profiles into unmeasured regions. Applications to multiple datasets confirm that ImSpiRE can enhance spatial resolution to the subspot level while contributing to the discovery of tissue domains, signaling communication patterns, and spatiotemporal characterization.

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铈、铝变质奥-贝钢中共晶体异质核心研究

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中国稀土学报 1997年第4期15卷 334-339页

作者：许振明姜启川关庆丰何镇明西北工业大学凝固技术国家重点实验室吉林工业大学金属材料系

Ｃｅ、Ａｌ复合变质团球状共晶体奥贝钢（简称ＡＢＮＥ钢）中的共晶体是由于Ｃ、Ｍｎ偏析，在凝固后期奥氏体枝晶间形成了渗碳体和奥氏体的伪共晶组织。通过热力学和二维点阵错配度计算，采用透射电镜和扫描电镜观察，发现ＣｅＯ２和... 详细信息

Ｃｅ、Ａｌ复合变质团球状共晶体奥贝钢（简称ＡＢＮＥ钢）中的共晶体是由于Ｃ、Ｍｎ偏析，在凝固后期奥氏体枝晶间形成了渗碳体和奥氏体的伪共晶组织。通过热力学和二维点阵错配度计算，采用透射电镜和扫描电镜观察，发现ＣｅＯ２和ＣｅＡｌＯ３作为共晶体的异质核心而使共晶体球化。

关键词：铈铝 ANBE钢奥贝钢耐磨钢

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