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Investigation of the spike-stall warning method using the blade passing signal

Science China(Technological Sciences) 2018年第6期61卷 830-842页

作者： zhao jiayi XI Guang WANG ZhiHeng zhao Yang School of Energy and Power Engineering Xi＇an Jiaotong University Xi ＇an 710049 China

The vaned-diffuser usually brings compressor instability problems under the small flow rate, for instance the spike-type rotating stall phenomenon which restricts the operation range and may cause the trouble of blade fatigue. Since it is difficult to mathematically predict the spike-type stall for its randomness, finding out a practical method to warning this stall precursor appears to be meaningful. The paper explains the relationship between the spike-type precursor and the blade passing irregularity coefficient to analyze whether this coefficient is appropriate for the spike-stall warning inside a centrifugal compressor with the vaned-diffuser. The advanced wireless measurements were conducted on a 1.5 stages test centrifugal compressor to capture the unsteady behavior progressing from the design to stall inception within the region between the impeller trailing edge(TE) and diffuser leading edge(LE). The circumferential distribution of the blade passing irregularity has been quantitatively *** steep increase of the blade passing irregularity at some "special locations", which is responsible for the onset of the spiketype precursor, is highlighted. Also, to further understand the spike precursor inside the diffuser passage corresponding to the circumferential "special location" with maximum irregularity, the high-response transient measurement within this passage is presented. With the help of full-annulus computational fluid dynamics(CFD) simulation and the mathematical model, it is proved that the blade passing irregularity precisely reflects the flow characteristics during the spike precursor, which presents the guidance for this stall warning method.

关键词： centrifugal compressor transient measurement stall warning blade passing irregularity coefficient

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Simulation of nanofluid natural convection based on single-particle hydrodynamics in energy-conserving dissipative particle dynamics(eDPD)

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1429-1446页

作者： Wei LU Shuo CHEN Zhiyuan YU jiayi zhao School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji UniversityShanghai 201804China School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China

In the present study,the nanofliud natural convection is investigated by the energy-conserving dissipative particle dynamics(eDPD)method,where the nanoparticles are considered at the single-particle *** thermal expansion coefficientβand the viscosityμof the simulated system containing nanoparticles are calculated and found to be in close alignment with the previous simulation *** single-particle hydrodynamics in e DPD enables simulations of nanofluid natural convection with higher Rayleigh numbers and greater nanoparticle volume ***,this approach is utilized to simulate the nanoparticle distribution during the enhanced heat transfer process in the nanofluid natural *** localized aggregation of nanoparticles enhances the heat transfer performance of the nanofluid under specific Rayleigh numbers and nanoparticles volume fractions.

关键词： single-particle hydrodynamics energy-conserving dissipative particle dynamics(eDPD) nanoparticle nanofluid heat transfer

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Advances in Multiplexed Microfluidics for Infectious Disease Detection

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Infectious Microbes & Diseases 2023年第2期5卷 56-63页

作者： Yiwei Shi jiayi zhao Guangwen Cao Department of Epidemiology Second Military Medical UniversityShanghaiChina Shanghai Key Laboratory of Medical Bioprotection ShanghaiChina Key Laboratory of Biological Defense Ministry of EducationShanghaiChina.

Microfluidics enables miniaturization,functionality,high throughput and reproducibility of multipathogen *** microfluidic devices are electrochemical sensor–based,optical sensor–based,immunosensor-based and paper-based multiplexed ***,the simultaneous detection ofmultiple pathogens is limited because of the complexity and diversity of infectious disease sources and mutual interference among *** review provides an overview of recent advances in developing multiplex diagnostic microfluidic devices for detecting infectious diseases and discusses practical issues and *** review also coversmicrofluidic nucleic acid amplification strategies to improve detection ***,we discuss the limitations and challenges in the design of multiplexed microfluidics.

关键词： microfluidics simultaneous detection infectious diseases

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Genesis of Geothermal Fluid in Typical Geothermal Fields in Western Sichuan,China

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 873-882页

作者： zhao jiayi WANG Guiling ZHANG Cuiyun XING Linxiao LI Man ZHANG Wei The Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China

The hydrogeochemical characteristics of geothermal fluids can reveal the genesis of geothermal systems and act as important references for developing and using geothermal *** study presents hydrogeochemical processes and thermal cycle mechanisms of typical geothermal fields in Western *** on the geological conditions in Western Sichuan,29 hot springs in three geothermal fields in the Batang and Litang areas were selected for hydrochemical and isotopic(δD andδ18O)***,the temperature of the thermal reservoir was calculated and the upflow cooling process of the hot springs was *** of the subterranean hot waters in Batang and Litang are of the HCO3-Na hydrochemical *** ion variation in Batang is primarily affected by water-rock *** is a strong positive correlation between Na+,B?,and Cl?in Litang,suggesting that they have the same material *** Na+and metaboric acid content is relatively high,which indicates that the groundwater runoff in both areas is relatively long-lasting,with reduced flow velocity;moreover,the metasilicic acid content is relatively high,which supports this *** hydrogen and oxygen isotopes plot near the atmospheric precipitation line,indicating that groundwater recharge is functionally obtained from *** calculated thermal storage temperatures in Batang and Litang were 88–199℃ and 96–154℃,*** proportion of cold water mixing in Batang was 64%–67%,while that in Litang was 60%–68%.According to the calculated results,the initial thermal cycle depth of the Batang area(4540–4780 m)was greater than that of the Litang area(3150–3960 m).The enthalpy of the deep parental geothermal fluid in Batang was 1550 J/g with a Cl^(-)concentration of 37 mg/L,while that in Litang was 2100 J/g with a Cl^(-)concentration of 48 mg/L.

关键词： hydrochemistry type Si-enthalpy model enthalpy-Cl model geothermal reservoir temperature

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Spatial conﬁnement of zeolitic imidazolate framework deposits by porous carbon nanospheres for dual-atom catalyst towards high-performance oxygen reduction reaction

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Nano Research 2023年第8期16卷 11464-11472页

作者： jiayi zhao Ping Li Kaicai Fan Wenjie Wei Fenghong Lu Huimin zhao Bin Li Lingbo Zong Lei Wang Key Laboratory of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China

Dual atom catalysts(DACs),are promising electrocatalysts for oxygen reduction reaction(ORR)on account of the potential dual-atom active sites for the optimized adsorption of catalytic intermediates and the lower reaction energy ***,spatial conﬁnement strategy to fabricate DACs with well-defined Fe,Co dual-atom active site is proposed by implanting zeolitic imidazolate frameworks inside the pores of highly porous carbon nanospheres(Fe/Co-SAs-Nx-PCNSs).The atomically dispersed dual-atom active sites facilitate the adsorption/desorption of ***,the spatial conﬁnement effect protects metal atoms *** from the rich accessible dual-atom active sites and boosted mass transport,we achieve remarkable ORR performance with half-wave potential up to 0.91 and 0.8 V(*** hydrogen electrode(RHE)),and long-term stability up to 10 h in both alkaline and acidic *** remarkably enhanced ORR catalytic property of our as-developed DACs is in the rank of excellence for 1%.The as-developed rechargeable Zn-air battery(ZAB)with Fe/Co-SAs-Nx-PCNSs air cathode delivers ultrahigh power density of 216 mW·cm^(−2),outstanding specific capacity of 813 mAh·g^(−1),and promising cycling operation durability over 160 *** flexible Zn-air battery also exhibits excellent specific capacity,cycling stability,and flexibility *** work opens up a new pathway for the multiscale design of efficient electrocatalysts with atomically dispersed multiple active sites.

关键词： spatial confinement zeolitic imidazolate framework porous carbon nanospheres(PCNSs) dual-atom catalyst oxygen reduction reaction(ORR)

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The Mathematical Model of Short-Term Forest Fire Spread

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Journal of Applied Mathematics and Physics 2022年第5期10卷 1748-1761页

作者： Sunben Chiu Ying Li jiayi zhao School of Mathematical Sciences South China Normal University Guangzhou China College of Engineering City University of Hong Kong Hong Kong China School of Communication Hong Kong Baptist University Hong Kong China School of Computers Guangdong University of Technology Guangzhou China School of Politics and Law Guangdong University of Technology Guangzhou China

In this paper, we establish a mathematical model of the forest fire spread process based on a partial differential equation. We describe the distribution of time field and velocity field in the whole two-dimensional space by vector field theory. And we obtain a continuous algorithm to predict the dynamic behavior of forest fire spread in a short time. We use the algorithm to interpolate the fire boundary by cubic non-uniform rational B-spline closed curve. The fire boundary curve at any time can be simulated by solving the Eikonal equation. The model is tested in theory and in practice. The results show that the model has good accuracy and stability, and it’s compatible with most of the existing models, such as the elliptic model and the cellular automata model.

关键词： Forest Fire Spread Model Spatial Velocity Field Eikonal Equation Dynamic Simulation Non-Uniform Rational B-Spline

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Investigation of dementia awareness among stroke patients in China:A cross-sectional study

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Journal of Traditional Chinese Medical Sciences 2021年第2期8卷 155-160页

作者： Jing Zhou Ying Wang jiayi zhao Baoxin Chen Xuemei Liu Chen Fu Xiaobing Hou Huanmin Niu Yunling Zhang Xianglan Jin Department of Neurology Dongfang HospitalBeijing University of Chinese MedicineBeijing100078China School of Postgraduate Beijing University of Chinese MedicineBeijing100029China Department of Physiotherapy Wang Jing Hospital of CACMSBeijing100102China Department of Neurology Beijing First Hospital of Integrated Chinese and Western MedicineBeijing100026China Department of Neurology Xiyuan Hospital CACMSBeijing100091China

Objective:To provide guidelines for the prevention of post-stroke dementia,we investigated whether stroke patients were aware of post-stroke dementia and their level of dementia-related ***:Five dementia-related questions were designed.A field survey was conducted in a questionand-answer method using the designed *** surveys assessed 3000 stroke patients(2 weekse6 months after stroke attacks)from 14 hospitals/clinical centers in 7 provinces and cities across ***:Among 3000 stroke patients,80.5%had heard of dementia,39.1%knew that stroke can lead to dementia,55.7%believed dementia can be prevented,50.8%thought dementia can be cured,and only 8.8%had ever seen a doctor because of memory ***,patients were classified into three groups,including a no cognitive impairment(NCI)group,a mild cognitive impairment(MCI)group,and a mild dementia(MD)*** the MCI and MD groups,only 8.7%(75/861)and 9.9%(64/649)of patients,respectively,had ever seen a doctor because of memory *** to our results,patients with a higher level of cognitive impairment had a lower awareness of dementia(P<.001).Conclusion:The awareness of dementia in stroke patients in China is low,and the consultation rate is even ***,patients with a higher level of cognitive impairment have a lower awareness of *** improve public awareness and improve prevention,more emphasis should be put on education regarding post-stroke *** cognitive function screening should be conducted on stroke patients as an effective way to assess dementia.

关键词： Stroke Dementia Cognitive dysfunction Public health

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可控转速机匣起始位置对跨声速压气机转子流动稳定性的影响

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工程热物理学报 2024年第5期45卷 1341-1349页

作者：赵佳诣吴宛洋钟兢军上海海事大学商船学院上海201306 上海电机学院机械学院上海201306

机匣处理的几何结构参数将对其扩稳机制和扩稳能力产生影响。本文针对可控转速机匣中可转动环段的起始位置对跨声速压气机转子流动稳定性的影响开展数值研究。结果表明,当可转动环段的起始位置从叶顶尾缘开始逐渐向上游移动的过程中,可... 详细信息

机匣处理的几何结构参数将对其扩稳机制和扩稳能力产生影响。本文针对可控转速机匣中可转动环段的起始位置对跨声速压气机转子流动稳定性的影响开展数值研究。结果表明,当可转动环段的起始位置从叶顶尾缘开始逐渐向上游移动的过程中,可转动环段作用范围的扩展使叶顶流场处于逆压流动的范围扩大,通流条件恶化,但由于同时也降低了叶尖负荷,稳定工作的流量范围得以扩大。而当起始位置继续向上游移动至20%轴向弦长和叶顶前缘处时,可转动环段能够分别完成对泄漏涡破碎后流体和来流主流的轴向加速,降低激波/泄漏涡干涉强度的同时削弱了堵塞效应,转子流动稳定性得到有效改善,特别是当起始位置位于叶顶前缘时,稳定工作裕度提高了52.56%。

关键词：可控转速机匣起始位置跨声速压气机转子叶顶泄漏流流动稳定性

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Dhx33 promotes B-cell growth and proliferation by controlling activation-induced rRNA upregulation

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Cellular & Molecular Immunology 2023年第3期20卷 277-291页

作者： Xiaoyu He jiayi zhao Abidan Adilijiang Peicheng Hong Pengda Chen Xinyong Lin Jun Xie Ying Du Yun Liu Lianghua Lin Hyun Yong Jin Yazhen Hong Wen-Hsien Liu Changchun Xiao state Key Laboratory of Cellular Stress Biology School of Life SciencesFaculty of Medicine and Life SciencesXiamen UniversityXiamenFujianChina Department of Immunology and Microbiology The Scripps Research InstituteLa JollaCA 92037USA Genentech Inc. South San FranciscoCA 94080USA Sanof Institute for Biomedical Research Suzhoujiangsu 215123China

Upon recognition of foreign antigens,naïve B cells undergo rapid activation,growth,and *** B-cell growth and proliferation are coupled with activation remains poorly *** CRISPR/Cas9-mediated functional analysis and mouse genetics approaches,we found that Dhx33,an activation-induced RNA helicase,plays a critical role in coupling B-cell activation with growth and *** mice with B-cell-specific deletion of Dhx33 exhibited impaired B-cell development,germinal center reactions,plasma cell differentiation,and antibody ***33-deficient B cells appeared normal in the steady state and early stage of activation but were retarded in growth and ***,Dhx33 played an indispensable role in activation-induced upregulation of ribosomal DNA(rDNA)*** the absence of Dhx33,activated B cells were compromised in their ability to ramp up 47S ribosomal RNA(rRNA)production and ribosome biogenesis,resulting in nucleolar stress,p53 accumulation,and cellular *** findings demonstrate an essential role for Dhx33 in coupling B-cell activation with growth and proliferation and suggest that Dhx33 inhibition is a potential therapy for lymphoma and antibody-mediated autoimmune diseases.

关键词： RNA helicases B cell activation Germinal center reaction

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近失速工况离心压气机叶顶非定常流动的数值与实验研究

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工程热物理学报 2023年第5期44卷 1199-1208页

作者：赵阳席光赵家毅杨党国中国空气动力研究与发展中心绵阳621000 西安交通大学能源与动力工程学院西安710049

本文选取大尺寸离心压气机为研究对象,将动态压力实验测量与全通道三维数值模拟结合起来研究了进口导叶预旋对压气机叶轮内部流动特征的影响,阐释了近失速工况叶轮叶顶间隙非定常流动的发展机理。首先,0?预旋下近失速工况叶轮前缘会发... 详细信息

本文选取大尺寸离心压气机为研究对象,将动态压力实验测量与全通道三维数值模拟结合起来研究了进口导叶预旋对压气机叶轮内部流动特征的影响,阐释了近失速工况叶轮叶顶间隙非定常流动的发展机理。首先,0?预旋下近失速工况叶轮前缘会发生峰值频率为343 Hz的宽频谱扰动,不同的导叶预旋能够促进或抑制该非定常扰动的发生;其次,叶顶间隙涡与主叶片吸力面分离流相互作用在叶轮叶片吸力面附近形成低速区,叶顶间隙流是否前缘溢流决定了自激非定常扰动的发生与否。

关键词：离心压气机叶顶间隙流数值模拟动态压力

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