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A methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection strategy

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Frontiers in Energy 2023年第5期17卷 678-691页

作者： Haoqing WU Yaoyuan ZHANG Shijie MI Wenbin ZHAO zhuoyao he Yong QIAN Xingcai LU Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China

Gasoline compression ignition(GCI)combustion faces problems such as high maximum pressure rise rate(MPRR)and combustion deterioration at high loads.This paper aims to improve the engine performance of the GCI mode by regulating concentration stratification and promoting fuel-gas mixing by utilizing the double main-injection(DMI)strategy.Two direct injectors simultaneously injected gasoline with an octane number of 82.7 to investigate the energy ratio between the two main-injection and exhaust gas recirculation(EGR)on combustion and emissions.High-load experiments were conducted using the DMI strategy and compared with the single main-injection(SMI)strategy and conventional diesel combustion.The results indicate that the DMI strategy have a great potential to reduce the MPRR and improve the fuel economy of the GCI mode.At a 10 bar indicated mean effective pressure,increasing the main-injection-2 ratio(Rm-2)shortens the injection duration and increases the mean mixing time.Optimized Rm-2 could moderate the trade-off between the MPRR and the indicated specific fuel consumption with both reductions.An appropriate EGR should be adopted considering combustion and emissions.The DMI strategy achieves a highly efficient and stable combustion at high loads,with an indicated thermal efficiency(ITE)greater than 48%,CO and THC emissions at low levels,and MPRR within a reasonable range.Compared with the SMI strategy,the maximum improvement of the ITE is 1.5%,and the maximum reduction of MPRR is 1.5 bar/°CA.

关键词： gasoline compression ignition injection strategy fuel stratification high efficiency high load

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Experimental study on impacts of fuel type on thermo-acoustic instability in a gas turbine model combustor

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Science China(Technological Sciences) 2021年第6期64卷 1345-1358页

作者： RUAN Can CheN FeiEr YU Tao CAI WeiWei he zhuoyao MAO YeBing LI XinLing LU XingCai School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Effects of liquid fuel composition variations on characteristics of self-excited thermo-acoustic instabilities in a lean premixed,pre-vaporized gas turbine model combustor were experimentally studied.Test fuels included practical RP-3 jet fuel and its blending with iso-octane and n-dodecane,which were branched and linear alkanes respectively.Under the test conditions,dynamic pressure measurements indicated that the dominant instability frequency was highest for RP-3 flame,while RP-3/ndodecane flame exhibited the strongest instability strength.A further analysis showed that the instability frequency correlated well with the profiles of adiabatic flame temperature,and the strength of the instability highly depended on the ignition delay times of the fuels.Measurements of the flame structure and flow field with OH*chemiluminescence (CL) imaging and twodimensional particle image velocimetry (PIV) techniques indicated that changes in the fuel composition did not alter the unstable modes and general sequences of flame-flow structure oscillations.Further power spectra and proper orthogonal decomposition(POD) analysis suggested that axial oscillations along with precessing vortex core (PVC) induced helical motion predominated periodic flame structure and flow field oscillations.

关键词： combustion gas turbine engine fuel effects thermo-acoustic instability PIV

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Next‑Generation Sequencing‑Based Copy Number Variation Analysis in Chinese Patients with Primary Ciliary Dyskinesia Revealed Novel DNAH5 Copy Number Variations

Phenomics

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Phenomics 2024年第1期4卷 24-33页

作者： Weicheng Chen zhuoyao Guo Mengru Li Wei Sheng Guoying Huang Cardiovascular Center Children’s Hospital of Fudan University399 Wanyuan RoadShanghai 201102China Respirology Department Children’s Hospital of Fudan UniversityShanghai 201102China

Primary ciliary dyskinesia(PCD)is a rare disorder characterized by extensive genetic heterogeneity.However,in the genetic pathogenesis of PCD,copy number variation(CNV)has not received sufcient attention and has rarely been reported,especially in China.Next-generation sequencing(NGS)followed by targeted CNV analysis was used in patients highly suspected to have PCD with negative results in routine whole-exome sequencing(WES)analysis.Quantitative real-time polymerase chain reaction(qPCR)and Sanger sequencing were used to confrm these CNVs.To further characterize the ciliary phenotypes,high-speed video microscopy analysis(HSVA),transmission electron microscopy(TEM),and immunofuorescence(IF)analysis were used.Patient 1(F1:II-1),a 0.6-year-old girl,came from a nonconsanguineous family-I.She presented with situs inversus totalis,neonatal respiratory distress,and sinusitis.The nasal nitric oxide level was markedly reduced.The respiratory cilia beat with reduced amplitude.TEM revealed shortened outer dynein arms(ODA)of cilia.chr5:13717907-13722661del spanning exons 71–72 was identifed by NGS-based CNV analysis.Patient 2(F2:IV-4),a 37-year-old man,and his eldest brother Patient 3(F2:IV-2)came from a consanguineous family-II.Both had sinusitis,bronchiectasis and situs inversus totalis.The respiratory cilia of Patient 2 and Patient 3 were found to be uniformly immotile,with ODA defects.Two novel homozygous deletions chr5:13720087_13733030delinsGTTTTC and chr5:13649539_13707643del,spanning exons 69–71 and exons 77–79 were identifed by NGS-based CNV analysis.Abnormalities in DNA copy number were confrmed by qPCR amplifcation.IF showed that the respiratory cilia of Patient 1 and Patient 2 were defcient in dynein axonemal heavy chain 5(DNAH5)protein expression.This report identifed three novel DNAH5 disease-associated variants by WES-based CNV analysis.Our study expands the genetic spectrum of PCD with DNAH5 in the Chinese population.

关键词： Primary ciliary dyskinesia DNAH5 gene Copy number variation Phenotypic heterogeneity

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Designing metal sulfide-based cathodes and separators for suppressing polysulfide shuttling in lithium-sulfur batteries

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Nano Research 2024年第4期17卷 2574-2591页

作者： Guoyin Zhu Qingzhu Wu Xianghua Zhang Yuwen Bao Xuan Zhang zhuoyao Shi Yizhou Zhang Lianbo Ma Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials ScienceNanjing University of Information Science&TechnologyNanjing 210044China School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China School of Mechanical Engineering Jiangsu University of TechnologyChangzhou 213001China

Lithium-sulfur(Li-S)batteries,known for their high energy density,are attracting extensive research interest as a promising next-generation energy storage technology.However,their widespread use has been hampered by certain issues,including the dissolution and migration of polysulfides,along with sluggish redox kinetics.Metal sulfides present a promising solution to these obstacles regarding their high electrical conductivity,strong chemical adsorption with polysulfides,and remarkable electrocatalytic capabilities for polysulfide conversion.In this review,the recent progress on the utilization of metal sulfide for suppressing polysulfide shuttling in Li-S batteries is systematically summarized,with a special focus on sulfur hosts and functional separators.The critical roles of metal sulfides in realizing high-performing Li-S batteries have been comprehensively discussed by correlating the materials’structure and electrochemical performances.Moreover,the remaining issues/challenges and future perspectives are highlighted.By offering a detailed understanding of the crucial roles of metal sulfides,this review dedicates to contributing valuable knowledge for the pursuit of high-efficiency Li-S batteries based on metal sulfides.

关键词： lithium-sulfur batteries metal sulfides polysulfide shuttling sulfur hosts separator coating layers

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基于互联网的同质化护理服务对经外周静脉穿刺中心静脉置管肿瘤患者导管自我管理能力的影响

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医疗装备 2023年第19期36卷 140-142,150页

作者：贺卓瑶南昌大学第二附属医院江西南昌330006

目的探讨基于互联网的同质化护理服务对经外周静脉穿刺中心静脉置管(PICC)肿瘤患者导管自我管理能力的影响。方法选取2021年6月至2022年7月医院肿瘤科收治的80例PICC肿瘤患者,按照随机数字表法分为两组,各40例。对照组采取常规护理,观... 详细信息

目的探讨基于互联网的同质化护理服务对经外周静脉穿刺中心静脉置管(PICC)肿瘤患者导管自我管理能力的影响。方法选取2021年6月至2022年7月医院肿瘤科收治的80例PICC肿瘤患者,按照随机数字表法分为两组,各40例。对照组采取常规护理,观察组采取基于互联网的同质化护理服务。比较两组导管自我管理能力、PICC导管维护知识、并发症及生活质量。结果护理结束时,两组PICC自我管理能力量表评分、PICC导管维护知识评分均高于护理前,且观察组均高于对照组,差异有统计学意义(P<0.05)。观察组并发症发生率低于对照组,差异有统计学意义(P<0.05)。护理结束时,两组健康调查量表36(SF-36)评分均高于护理前,且观察组高于对照组,差异有统计学意义(P<0.05)。结论基于互联网的同质化护理服务可提高PICC肿瘤患者对PICC导管维护知识的认知度、导管自我管理能力,降低并发症发生风险,改善其生活质量。

关键词：经外周静脉穿刺中心静脉置管肿瘤互联网同质化护理自我管理能力

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Long-term in vivo chimeric cells tracking in non-human primate

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Protein & Cell 2024年第3期15卷 207-222页

作者： Junmo Wu Yu Kang Xiang Luo Shaoxing Dai Yuxi Shi zhuoyao Li Zengli Tang Zhenzhen Chen Ran Zhu Pengpeng Yang Zifan Li Hong Wang Xinglong Chen Ziyi Zhao Weizhi ji Yuyu Niu State Key Laboratory of Primate Biomedical Research Institute of Primate Translational MedicineKunming University of Science and TechnologyKunming 650500China Yunnan Key Laboratory of Primate Biomedical Research Kunming 650500China Faculty of Life Science and Technology Kunming University of Science and TechnologyKunming 650500China

Non-human primates(NHPs)are increasingly used in preclinical trials to test the safety and efficacy of biotech-nology therapies.Nonetheless,given the ethical issues and costs associated with this model,it would be highly advantageous to use NHP cellular models in clinical studies.However,developing and maintaining the naive state of primate pluripotent stem cells(PSCs)remains difficult as does in vivo detection of PSCs,thus limiting biotech-nology application in the cynomolgus monkey.here,we report a chemically defined,xeno-free culture system for culturing and deriving monkey PSCs in vitro.The cells display global gene expression and genome-wide hypometh-ylation patterns distinct from monkey-primed cells.We also found expression of signaling pathways components that may increase the potential for chimera formation.Crucially for biomedical applications,we were also able to integrate bioluminescent reporter genes into monkey PsCs and track them in chimeric embryos in vivo and in vitro.The engineered cells retained embryonic and extra-embryonic developmental potential.Meanwhile,we generated a chimeric monkey carrying bioluminescent cells,which were able to track chimeric cells for more than 2 years in living animals.Our study could have broad utility in primate stem cell engineering and in utilizing chimeric monkey models forclinical studies.

关键词： pluripotent stem cells bioluminescence imaging non-human primates

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稀释气体对点燃式天然气发动机性能的影响

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车用发动机 2018年第3期 81-86页

作者：储利民何卓遥朱磊上海柴油机股份有限公司上海200432 上海交通大学内燃机研究所上海200240

进气稀释策略是优化发动机性能的重要手段,针对稀释气体的热作用和稀释作用对发动机性能的影响展开了深入的研究。结果表明,热作用和稀释作用均使得缸内燃烧温度降低、放热率峰值降低、燃烧持续期变长、放热相位推迟,同时使NO_x排放降低... 详细信息

进气稀释策略是优化发动机性能的重要手段,针对稀释气体的热作用和稀释作用对发动机性能的影响展开了深入的研究。结果表明,热作用和稀释作用均使得缸内燃烧温度降低、放热率峰值降低、燃烧持续期变长、放热相位推迟,同时使NO_x排放降低,但THC排放增大。热作用会使整机经济性恶化,而稀释作用则使整机经济性提高,稀释作用使经济性提高的主要原因在于其提高了工质的等熵指数。

关键词：天然气发动机进气稀释热作用稀释作用

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基于特征解耦表征学习的无监督混合失真图像复原方法

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计算机辅助设计与图形学学报 2024年第2期36卷 236-247页

作者：符颖李卓遥朱欣宇龚敏学周激流成都信息工程大学计算机学院成都610225 四川省2011图形图像与空间信息协同创新中心成都610225

针对真实场景下多种混合失真组合的多任务图像复原,结合生成对抗网络与编码器提出了一种基于无监督对偶学习的图像复原方法.该方法引入特征解耦模块,通过修正基于增益控制的归一化,将不同退化机制的特征表示分配到不同的特征通道中,使... 详细信息

针对真实场景下多种混合失真组合的多任务图像复原,结合生成对抗网络与编码器提出了一种基于无监督对偶学习的图像复原方法.该方法引入特征解耦模块,通过修正基于增益控制的归一化,将不同退化机制的特征表示分配到不同的特征通道中,使得不同退化特征表达相互独立,实现了通道上的特征解耦.同时,为了进一步过滤掉退化机制的特征表示并保持原图像内容信息的细节,利用通道注意力机制实现特征解耦后自适应地选择有用的特征表示,使其适用于真实场景下混合失真组合的图像复原任务.实验结果表明,所提算法在单一退化类型GoPro数据集上对比基于尺度循环网络的算法(scale-recurrent network,SRN),峰值信噪比和结构相似性2项指标值分别提高了0.499 dB和0.044;在混合退化类型DIV2K数据集上对比基于操作选择注意力网络的算法(operation-wise attention network,OWAN),峰值信噪比和结构相似性2项指标值分别提高了0.163 dB和0.015,在实现复原图像的同时,保留了图像的纹理和细节信息.

关键词：混合失真图像图像复原特征解耦注意力机制

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进气道预混天然气对生物柴油发动机燃烧与排放性能的影响

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车用发动机 2015年第4期 32-36页

作者：敬启建罗斌何卓遥朱磊张武高上海交通大学动力机械与动力工程教育部重点实验室上海200240

在1台QCH 1105单缸柴油机上,试验研究了进气道预混天然气对生物柴油发动机燃烧与排放性能的影响。结果表明:随着天然气预混比例的升高,生物柴油发动机最大燃烧压力减小,燃烧相位推迟,缸内平均温度略有下降,NOx排放明显降低;预混天然气时... 详细信息

在1台QCH 1105单缸柴油机上,试验研究了进气道预混天然气对生物柴油发动机燃烧与排放性能的影响。结果表明:随着天然气预混比例的升高,生物柴油发动机最大燃烧压力减小,燃烧相位推迟,缸内平均温度略有下降,NOx排放明显降低;预混天然气时,大负荷工况下燃油消耗率有所下降,HC和CO排放有所增加,炭烟排放随着天然气预混率的升高大幅降低。可见,进气道预混天然气对改善生物柴油发动机的经济性和排放性具有良好的潜力。

关键词：生物柴油天然气进气预混合燃烧排放

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农村留守儿童家长支持与身体活动的关系:基于锻炼动机与锻炼自我效能的链式中介模型

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湖北体育科技 2024年第2期43卷 51-57,108页

作者：刘言田卓尧魏源彭爽方春露广州体育学院运动技战术诊断与机能评定重点实验室广东广州510000

目的家长支持对儿童青少年身体活动的影响机制及其之间的关系尚不明确,旨在探究家长支持、锻炼动机和锻炼自我效能感对留守儿童身体活动的关系。方法采用问卷调查法、数理统计法对实验对象以及结果进行分析。结果 1)家长支持对农村留... 详细信息

目的家长支持对儿童青少年身体活动的影响机制及其之间的关系尚不明确,旨在探究家长支持、锻炼动机和锻炼自我效能感对留守儿童身体活动的关系。方法采用问卷调查法、数理统计法对实验对象以及结果进行分析。结果 1)家长支持对农村留守儿童身体活动之间存在正相关关系,对身体活动具有显著的预测作用(β=0.29,p<0.001);2)锻炼动机、锻炼自我效能在家长支持对身体活动的影响过程中的均起到部分中介的作用,中介效应值分别为:0.035、0.119;3)除健康动机、外貌动机、乐趣动机、社交动机和健康因子外,其余的预测变量对身体活动都有显著的预测作用(p<0.05);4)锻炼动机和锻炼自我效能在家长支持和农村留守儿童身体活动之间起到链式中介作用,链式中介效应值为0.093,占总效应的21.7%。结论 1)家长支持能显著正向预测农村留守儿童身体活动;2)家长支持也能通过锻炼动机和锻炼自我效能感的中介效应间接影响农村留守儿童身体活动。中介效应包括3条路径,即锻炼动机和锻炼自我效能感的个体中介效应以及锻炼动机和锻炼自我效能感的链式中介效应。

关键词：农村留守儿童锻炼动机家长支持身体活动锻炼自我效能感

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