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Effects of dimethyl ether on soot formation in premixed laminar flame by laser induced incandescence method

Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 312-319页

作者： zengqiang zhu Zheyang Li Chao Liu Xiao Chen Shenghua Liu School of Energy and Power Engineering Xi'an Jiaotong UniversityXi'an 710049China Research Institute Weichai Holding Group Co.Ltd.Weifang 261001China

The control of PM emission is a rather complicated problem to be solved both for diesel engine and GDI *** are vast factors affecting PM emission,the fuel,A/F,combustion temperature and so *** undoubtedly,most efforts are paid to exhaust aftertreatment,rather than the control of *** paper is to investigate the effect of dimethyl ether(DME,CH3OCH3)on soot generation in ***,a laser induced incandescence(LII)measurement system for soot volume concentration measurements in flame is *** DME gaseous mixtures were prepared with equivalence ratios 1 and *** highlight its effect on soot formation,acetylene known as the precursor of soot,is added in different ***,CO2 is mixed to simulate exhaust gas recycling(EGR)effect in *** experimental results indicate that the fuel property and A/F ratio are the dominating factors for the generation of soot during *** combustion of DME doesn't emit soot obviously even under rich mixture *** burning the mixture of DME and acetylene(C2H2)in different proportion,there is barely soot emission at equivalence ratio of *** soot emission increases as the proportion of C2H2 increases at equivalence ratio 2,and the DME addition reduces the soot emission of C2H2 ***2 dilution doesn't lead to the increase of soot when burning DME at equivalence 1 and *** emission is lower when the mixture of DME and acetylene is diluted by CO2,though soot volume concentration increases slightly as the proportion of C2H2 *** kinetic analysis indicates that the combustion of DME does not produce the precursor of *** fuel-rich combustion conditions,C2H2 reacts with H radical to form C2H3,which leads to *** DME is added,it competes for H radical,which reduces the formation of C2H3 and thus reduces soot *** research carried out in this paper indicates that DME fuel has obviously power to reduce soot formation during combustion,no matter whether

关键词： Energy and power engineering DME Acetylene Soot Laser induced incandescence Equivalence ratio

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基于Blackman-turkey法生成轨道不平顺时程研究

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沈阳建筑大学学报（自然科学版） 2010年第4期26卷 644-649页

作者：崔高航陶夏新朱增强边艳丽东北林业大学土木工程学院黑龙江哈尔滨150040 哈尔滨工业大学土木工程学院黑龙江哈尔滨150090 塔里木油田公司西气东输项目经理部新疆库尔勒841000 沈阳建筑大学图书馆辽宁沈阳110168

目的为研究城轨交通三维空间振动传播规律,探讨了激励源-轮轨接触面不平顺时程的获取方法.方法采用周期图法,根据功率谱估计轨道谱的傅里叶谱的幅值,再辅以随机相位角,通过傅里叶逆变换(IFFT)得到轨道不平顺时程样本.结果推导了轨道不... 详细信息

目的为研究城轨交通三维空间振动传播规律,探讨了激励源-轮轨接触面不平顺时程的获取方法.方法采用周期图法,根据功率谱估计轨道谱的傅里叶谱的幅值,再辅以随机相位角,通过傅里叶逆变换(IFFT)得到轨道不平顺时程样本.结果推导了轨道不平顺谱从空间域向频率域的转化关系,研究了依谱密度函数生成时程样本的方法,给出了三种方法生成的美国六级轨道谱对应的时程样本,比较了三种方法的计算效率和精度.结论 Blackman-Turkey法生成的时程无论从精度还是从计算速度方面都优于三角级数法和白噪声滤波法生成的时程样本,生成的不平顺时程可以用于车辆-轨道-路基系统的非线性振动分析.

关键词：轨道不平顺轨道谱 Blackman—turkey法时程样本

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Modification of Maxwell model for conductivity prediction of carbon nanotubes-filled polymer composites with tunneling effect

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 25-36页

作者： Jue zhu Longyuan LI Ningtao zhu Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and Pipeline Key Laboratory of Impact and Safety Engineering (Ningbo University) Ministry of Education School of Engineering Computing and Mathematics University of Plymouth Xi'an Zhanshi Testing & Engineering Co.Ltd.

Carbon nanotubes(CNTs) have garnered great attention in recent years due to their outstanding electrical, thermal, and mechanical properties. The incorporation of small amounts of CNTs in polymers can substantially improve the sensitivity of the polymer's electrical conductivity. This paper presents a modified Maxwell model to evaluate the electrical conductivity of CNTs-filled polymer composites by introducing a transition zone to account for the tunneling effect. In this modified Maxwell model, the CNTs-filled polymer composite is modeled as a three-phase composite, consisting of a matrix(polymer), inclusions(CNTs), and a transition zone(tunneling zone). The effective electrical conductivity(EEC) of the composite is calculated based on the volume fractions and electrical conductivities of the matrix, inclusions, and transition zone. The model's validity is confirmed through the use of available test data, which demonstrates its capability to accurately capture the nonlinear conductivity behavior observed in CNTs-polymer composites. This study offers valuable insights into the design of high-performance conductive polymer nanocomposites, and enhances the understanding of electrical conduction mechanisms in CNT-dispersed polymer composites.

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Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 12-17页

作者： Song Jiang Congwen zhu Ning Jiang State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

The dominant annual cycle of sea surface temperature(SST)in the tropical Pacific exhibits an antisymmetric mode,which explains 83.4%total variance,and serves as a background of El Niño-Southern Oscillation(ENSO).However,there is no consensus yet on its anomalous impacts on the phase and amplitude of *** on data during 1982-2022,results show that anomalies of the antisymmetric mode can affect the evolution of ENSO on the interannual scale via Bjerknes feedback,in which the positive(negative)phase of the antisymmetric mode can strengthen El Niño(La Niña)in boreal winter via an earlier(delayed)seasonal cycle transition and larger(smaller)annual *** magnitude of the SST anomalies in the equatorial eastern Pacific can reach more than±0.3◦C,regulated by the changes in the antisymmetric mode based on random sensitivity *** reveal the spatial pattern of the annual cycle associated with the seasonal phase-locking of ENSO evolution and provide new insight into the impact of the annual cycle of background SST on ENSO,which possibly carries important implications for forecasting ENSO.

关键词： Annual cycle SST anomaly Antisymmetric mode ENSO

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Satellite remote sensing reveals overwhelming recovery of forest from disturbances in Asia

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 46-51页

作者： Yiying zhu Hesong Wang Anzhi Zhang School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina Key Laboratory of Regional Climate and Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Forestry and Landscape Architecture Xinjiang Agricultural UniversityUrumqiChina

Forest ecosystems play key roles in mitigating human-induced climate change through enhanced carbon uptake;however,frequently occurring climate extremes and human activities have considerably threatened the stability of *** the same time,detailed accounts of disturbances and forest responses are not yet well quantified in *** study employed the Breaks For Additive Seasonal and Trend method-an abrupt-change detection method-to analyze the Enhanced Vegetation Index time series in East Asia,South Asia,and Southeast *** approach allowed us to detect forest disturbance and quantify the resilience after *** showed that 20%of forests experienced disturbance with an increasing trend from 2000 to 2022,and Southeast Asian countries were more severely affected by ***,95%of forests had robust resilience and could recover from disturbance within a few *** resilience of forests suffering from greater magnitude of disturbance tended to be stronger than forests with lower disturbance *** summary,this study investigated the resilience of forests across the low and middle latitudes of Asia over the past two *** authors found that most forests exhibited good resilience after disturbance and about two-thirds had recovered to a better state in *** findings of this study underscore the complex relationship between disturbance and resilience,contributing to comprehension of forest resilience through satellite remote sensing.

关键词： Forest ecosystem Enhanced vegetation index Breaks for additive seasonal and trend method Disturbance Resilience

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Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang zhu Chenxi Ding Zhe Sui Hong Su Xu Guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

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The emerging role of nitric oxide in the synaptic dysfunction of vascular dementia

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Neural Regeneration Research 2025年第2期20卷 402-415页

作者： Xiaorong Zhang Zhiying Chen Yinyi Xiong Qin Zhou Ling-Qiang zhu Dan Liu Department of Pathology Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Jiujiang Clinical Precision Medicine Research Center JiujiangJiangxi ProvinceChina Center for Cognitive Science and Transdisciplinary Studies Jiujiang UniversityJiangxi ProvinceChina Department of Neurology Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Department of Rehabilitation Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Department of Pathophysiology School of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

With an increase in global aging,the number of people affected by cerebrovascular diseases is also increasing,and the incidence of vascular dementia-closely related to cerebrovascular risk-is increasing at an epidemic ***,few therapeutic options exist that can markedly improve the cognitive impairment and prognosis of vascular dementia *** in Alzheimer’s disease and other neurological disorders,synaptic dysfunction is recognized as the main reason for cognitive *** oxide is one of the ubiquitous gaseous cellular messengers involved in multiple physiological and pathological processes of the central nervous ***,nitric oxide has been implicated in regulating synaptic plasticity and plays an important role in the pathogenesis of vascular *** review introduces in detail the emerging role of nitric oxide in physiological and pathological states of vascular dementia and summarizes the diverse effects of nitric oxide on different aspects of synaptic dysfunction,neuroinflammation,oxidative stress,and blood-brain barrier dysfunction that underlie the progress of vascular ***,we propose that targeting the nitric oxide-sGC-cGMP pathway using certain specific approaches may provide a novel therapeutic strategy for vascular dementia.

关键词： endoplasmic reticulum stress endothelial nitric oxide synthase gene therapy nitric oxide NO-sGC-cGMP pathway synaptic dysfunction vascular dementia

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Algebraic form and analysis of SIR epidemic dynamics over probabilistic dynamic networks

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Control Theory and Technology 2023年第4期21卷 602-611页

作者： Hongxing Yuan zengqiang Chen Zhipeng Zhang Rui zhu Zhongxin Liu College of Artificial Intelligence Nankai UniversityTianjin300350China School of Artificial Intelligence Tiangong UniversityTianjin300387China

The outbreak of corona virus disease 2019 has profoundly affected people’s way of *** is increasingly necessary to investigate epidemics over social *** paper studies susceptible-infected-removed(SIR)epidemics via the semi-tensor ***,a formal susceptible-infected-removed epidemic dynamic model over probabilistic dynamic networks(SIRED-PDN)is *** on an evolutionary rule,the algebraic form for the dynamics of individual states and network topologies is given,***,the SIRED-PDN can be described by a probabilistic mix-valued logical *** providing an algorithm,all possible final spreading equilibria can be obtained for any given initial epidemic state and network topology by seeking attractors of the *** the shortest time for all possible initial epidemic state and network topology profiles to evolve to the final spreading equilibria can be obtained by seeking the transient time of the ***,an illustrative example is given to show the effectiveness of our model.

关键词： SIR epidemic Probabilistic dynamic networks Final spreading equilibria Semi-tensor product of matrices Algebraic form

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Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-Feng zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

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Magnetic resonance imaging evaluation and nuclear receptor binding SET domain protein 1 mutation in the Sotos syndrome with attention-deficit/hyperactivity disorder

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World Journal of Clinical Cases 2025年第2期13卷 5-9页

作者： Wei zhu Shanghai XiRong Information Science and Technology Co. LtdNational Science and Technology ParkSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China

Sotos syndrome is characterized by overgrowth features and is caused by alterations in the nuclear receptor binding SET domain protein 1 ***/hyperactivity disorder(ADHD)is considered a neurodevelopment and psychiatric disorder in *** characteristics and clinical presentation could play an important role in the diagnosis of Sotos syndrome and *** resonance imaging(MRI)has been used to assess medical images in Sotos syndrome and *** images process is considered to display in MRI while wavelet fusion has been used to integrate distinct images for achieving more complete information in single image in this *** the future,genetic mechanisms and artificial intelligence related to medical images could be used in the clinical diagnosis of Sotos syndrome and ADHD.

关键词： Sotos syndrome Attention-deficit/hyperactivity disorder Genetic mutation Magnetic resonance imaging Wavelet fusion

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