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Characteristics of the pollutant emissions in a tunnel of Shanghai on a weekday

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Journal of Environmental Sciences 2018年第9期30卷 136-149页

作者： Rui Li ya Meng Hongbo Fu Liwu Zhang Xingnan Ye Jianmin Chen Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science&EngineeringInstitute of Atmospheric SciencesFudan UniversityShanghai200433P.R.China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092P.R.China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CIcaEET) Nanjing University of Information Science and TechnologyNanjing 210044China

Tunnel displays a typical semi-closed environment, and multitudes of the pollutants tend to accumulate. The samples of gaseous pollutants and particulate matter （PM） were collected from the Xiangyin tunnel at Shanghai to investigate the characteristics of the pollutant emissions. The results indicated that both gaseous pollutants and PM exhibited much higher concentrations during the rush hours in the morning and at night due to vehicle emission. Two peaks of the PM concentration were observed in the scope of 0.7-1.1 and 3.3-4.7 μm, accounting for 14.6% and 20.3% of the total concentrations, respectively. Organic matter （OM）, EC, and many water-soluble ions were markedly higher at the rush hours in the morning than those at night, implicating comprehensive effects of vehicle types and traffic volume. The particle number concentrations exhibited two peaks at Aitken mode （25 nm and 100 rim） and accumulation mode （600 nm）, while the particle volume concentration displayed high values at the accumulation mode （100-500 nm） and coarse mode （2.5-4.0 μm）. The peak around 100 nm was detected in the morning rush hours, but it diminished with the decrease of the traffic volume. Individual-particle analysis revealed that main particles in the tunnel were Fe-rich particles, K-rich particles, mineral particles, ca-S rich particles and A1-Si particles. The particles collected at the rush hours displayed marked different morphologies, element concentrations and particle sizes compared to the ones collected at the non-rush period. The data presented herein could shed a light on the feature of vehicle emissions.

关键词： Tunnel Vehicle emission Size distribution Morphology

REAL-TIME ASSESSMENT OF MICROWAVE ABLATION EFFIcaCY BY NIR SPECTROSCOPIC TECHNIQUE

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Journal of Innovative Optical Health Sciences 2014年第1期7卷 52-58页

作者： JINZHE ZHAO ZHIYU QIAN JIA LIU ya XU JIALI WU Department of Biomedical Engineering Nanjing University of Aeronautics and Astronautics Nanjing P.R.China The Affliated Tumor Hospital of Xiangya Medical School of Central South University/Hunan Provincial Tumor Hospital ChangshaP.R.China

Microwave ablation(MWA)status monitoring in real time plays a key role in assessment of therapeutic *** a novel realtime assessment method,near infrared spectroscopy(NIRs)was used to evaluate the ablation *** experiments were carried out on in vitroporcine *** optical measurement system for biological tissue is developed by our lab tomonitor reduced scattering coefficient(μ')at 690 nm of the coagulation *** is noted that p's of liver tissue,which increases as the liver tissue being ablated,is clearly related with the co-agulation status.μ's of normal tissue and coagulated tissue is 3-5 and 17-19 cm-1,*** changes ofμ's demonstrate that optical parameter can be used as an efficacy evaluation factor because it essentially indicates the degree of thermal *** withtemperat ure,optical parameter is more sensitive and accurate,which is promising for real-timetherapeutic eficacy assessment in MWA.

关键词： Near infrared spectroscopy reduced scattering coeficient therapeutic eficacy.

Electroacupuncture regulates the stress-injury-repair chain of events after cerebral ischemia/reperfusion injury

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Neural Regeneration Research 2017年第6期12卷 925-930页

作者： Peng Shi Lin-lin Sun Yi-shuo Lee ya Tu School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine

Inflammation after stroke is the main cause of cerebral ischemia/reperfusion injury. cascading events after injury can lead to cell death. Heat shock protein 70 and other endogenous injury-signaling molecules are released by damaged cells, which can lead to systemic stress reactions. Protecting the brain through repair begins with the stress-injury-repair signaling chain. This study aimed to verify whether acupuncture acts through this chain to facilitate effective treatment of ischemic stroke. Rat models of cerebral ischemia/reperfusion injury were established by Zea Longa＇s method, and injury sites were identified by assessing neurological function, 2,3,5-triphenyltetrazolium chloride staining, and hematoxylin-eosin staining. Electroacupuncture at acupoints Baihui（DU20） and Zusanli（ST36） was performed in the model rats with dilatational waves, delivered for 20 minutes a day at 2–100 Hz and an amplitude of 2 m A. We analyzed the blood serum from the rats and found that inflammatory cytokines affected the levels of adrenotrophin and heat shock protein 70, each of which followed a similar bimodal curve. Specifically, electroacupuncture lowered the peak levels of adrenocorticotrophic hormone and heat shock protein 70. Thus, electroacupuncture was able to inhibit excessive stress, reduce inflammation, and promote the repair of neurons, which facilitated healing of ischemic stroke.

关键词： repair acupuncture hematoxylin eosin minutes endogenous Acupuncture neurological inflammation staining

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建造标准:EPC项目技术管理的有效工具

工程建设与设计 2024年第5期 251-253页

作者：席靖雅沈万夫中水北方勘测设计研究有限责任公司天津300222 中信建设有限责任公司北京100020

针对项目建设目标、质量和成本管理、风险控制等方面的具体问题,论文进一步通过建造标准的应用场景、界面管理、编制过程,展开说明该管理工具的应用,结合实例展开详细说明了建造标准的各个控制项目如何具体化、可实施化,并指导工程实践。

关键词： EPC项目技术管理成本管理建造标准

A New Acylated Flavonoid from Anaphalis aureo-punctata

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Chinese Chemical Letters 2003年第1期14卷 66-67页

作者： yan Qi WU Shuo LI ya LI Yu LI National Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000

A new acylated flavonoid glycoside, 3-O-kaempferol-3-O-acetyl-6-O-(p-coumaroyl)-- D-glucopyranoside 1 was isolated from the whole plant of Anaphalis aureo-punctata. The structure was established by spectral methods.

关键词： Anaphalis aureo-punctata flavonoid 3-O-kaempferol-3-O-acetyl-6-O-(p-coumaroyl)- -D-glucopyranoside.

适应新时代要求的“隧道工程”课程教学改革探索

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教育教学论坛 2024年第28期 72-75页

作者：方勇杨宇王士民蒋雅君西南交通大学土木工程学院四川成都610031 成都航空职业技术学院马克思主义学院四川成都610100

“隧道工程”是土木工程一级学科大类的一个重要分支,课程理论知识广而深,应用性及实践性较强,涉及交叉专业多且更新较快。在新时代,当前“隧道工程”专业创新型人才培养须要打破传统教学模式,开创新的教学思路和教学方法。针对目前我... 详细信息

“隧道工程”是土木工程一级学科大类的一个重要分支,课程理论知识广而深,应用性及实践性较强,涉及交叉专业多且更新较快。在新时代,当前“隧道工程”专业创新型人才培养须要打破传统教学模式,开创新的教学思路和教学方法。针对目前我国高等教育建设发展新形势,结合新时代背景下的技术革新、“隧道工程”课程特点、当下交通隧道领域的发展需求及多年的教学与授课经验,对“隧道工程”教学方法及教学改革等方面进行了探讨,提出了一系列推动“隧道工程”教学质量进一步改善的建议。

关键词：隧道工程教学模式教学改革人才培养

Hydrodynamic Modeling with Grey-Box Method of A Foil-Like Underwater Vehicle

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China Ocean Engineering 2017年第6期31卷 773-780页

作者： LIU Xin-yu LI Yi-ping WANG ya-xing FENG Xi-sheng State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of Sciences Beijing 100049 China

In this study, a dynamic modeling method for foil-like underwater vehicles is introduced and experimentally verified in different sea tests of the Hadal ARV. The dumping force of a foil-like underwater vehicle is sensitive to swing motion. Some foil-like underwater vehicles swing periodically when performing a free-fall dive task in experiments. Models using conventional modeling methods yield solutions with asymptotic stability, which cannot simulate the self-sustained swing motion. By improving the ridge regression optimization algorithm, a grey-box modeling method based on 378 viscous drag coefficients using the Taylor series expansion is proposed in this study. The method is optimized for over-fitting and convergence problems caused by large parameter matrices. Instead of the PMM test data, the unsteady computational fluid dynamics calculation results are used in modeling. The obtained model can better simulate the swing motion of the underwater vehicle. Simulation and experimental results show a good consistency in free-fall tests during sea trials, as well as a prediction of the dive speed in the swing state.

关键词： unmanned underwater vehicle grey-box model hydrodynamics ridge regression correlations

Spectral Characteristics of White Organic Light-emitting Diodes Based on Novel Phosphorescent Sensitizer

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Chinese Journal of Chemical Physics 2008年第6期21卷 510-514页

作者： Xiao-qing Tang Jun-sheng Yu Lu Li Wen Wen ya-dong Jiang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China

White organic light-emitting diodes were fabricated by using a novel phosphorescence bis（1,2-diphenyl-1H-benzoimidazole）iridium（acetylacetonate）[（pbi）2Ir（acac）] as sensitizer and a fluorescent dye of 4- （dicyanomethylene）-2-t-butyl-6-（1,1,7,7-tetramethyljulolidyl-9-enyl）-4H-pyran （DCJTB） codoped into a carbazole polymer of poly（N-vinylcarbazole）（PVK）. Through characterizing the UV-Vis absorption spectra, the photoluminescence spectra of （pbi）2Ir（acac） and DCJTB, and the electroluminescence spectral properties of the WOLEDs, the energy transfer mechanisms of the codoped polymer system were deduced. The results demonstrate that the luminescent spectra with different intensity of （pbi）2Ir（acac） and DCJTB were co-existent in the EL spectra of the blended system, which is ascribed to an incomplete energy transfer process in the EL process. The efficient Forster and Dexter energy transfer between the host and the guests enabled a strong yellow emission from （pbi）2Ir（acac） and DCJTB, where （pbi）2Ir（acac） plays an important role as a phosphorescent sensitizer for DCJTB. With the blue emitting-layer of N,N＇-diphenyl-N,N＇-bis（1- naphthyl）（1,1＇-biphenyl）-4,4＇-diamine, the codoped system device achieved white emission. The codoped system showed that its Commissions Internationale de 1＇Eclairage coordinates were more independent of the variation of bias voltage than those of phosphorescent doped PVK systems.

关键词： White organic light-emitting diode Phosphorescent sensitizer Spectrum analysis

Hot Deformation and Dynamic Recrystallization Behavior of Austenite-Based Low-Density Fe–Mn–Al–C Steel

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Acta Metallurgica Sinica(English Letters) 2016年第5期29卷 441-449页

作者： ya-Ping Li Ren-Bo Song Er-Ding Wen Fu-Qiang yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China R&D Center BAIC Motor Corporation LTDBeijing 101300China

The hot deformation and dynamic recrystallization （DRX） behavior of austenite-based Fe-27Mn-ll.5A1- 0.95C steel with a density of 6.55 g cm-3 were investigated by compressive deformation at the temperature range of 900-1150 ℃ and strain rate of 0.01-10 s-1. Typical DRX behavior was observed under chosen deformation conditions and yield-point-elongation-like effect caused by DRX of 6-ferrite. The flow stress characteristics were determined by DRX of the 6-ferrite at early stage and the austenite at later stage, respectively. On the basis of hyperbolic sine function and linear fitting, the calculated thermal activation energy for the experimental steel was 294.204 kJ mo1-1. The occurrence of DRX for both the austenite and the 6-ferrite was estimated and plotted by related Zener-Hollomon equations. A DRX kinetic model of the steel was established by flow stress and peak strain without considering dynamic recovery and 6-ferrite DRX. The effects of deformation temperature and strain rate on DRX volume fraction were discussed in detail. Increasing deformation temperature or strain rate contributes to DRX of both the austenite and the 6-ferrite, whereas a lower strain rate leads to the austenite grains growth and the 6-ferrite evolution, from banded to island-like structure.

关键词： Fe-Mn-AI-C steel Hot deformation Dynamic recrystallization Yield-point-elongation-likeeffect