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Characterization of particulate matter from diesel passenger cars tested on chassis dynamometers

Journal of Environmental sciences 2017年第4期29卷 21-32页

作者： sungwoon Jung Jaehyun Lim sangil Kwon sangwoo Jeon Jeongsoo Kim Jongtae lee sunmoon Kim Transportation Pollution Research Center National Institute of Environmental Research Incheon Republic of Korea Division of Global Environment Research National Institute of Environmental Research Incheon Republic of Korea Compliance & Defects Investigation Office Korea Automobile Testing & Research Institute Hwasung Republic of Korea

Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter（DPF）, diesel oxidation catalyst（DOC）and exhaust gas recirculation（EGR） under the vehicle driving cycles and regulatory *** particle number emissions（PNEs） decreased gradually during speed-up of vehicle from 17.3 to 97.3 km/hr. As the average vehicle speed increases, the size-segregated peak of particle number concentration shifts to smaller size ranges of particles. The correlation analysis with various particulate components such as particle number concentration（PNC）,ultrafine particle number concentration（UFPNC） and particulate matter（PM） mass was conducted to compare gaseous compounds（CO, CO2, HC and NOx）. The UFPNC and PM were not only emitted highly in seoul during severe traffic jam conditions, but also have good correlation with hydrocarbons and NOxinfluencing high potential on secondary aerosol generation. The effect of the dilution temperature on total PNC under the New European Driving Cycle（NEDC）, was slightly higher than the dilution ratio. In addition, the nuclei mode（DP： ≤ 13 nm） was confirmed to be more sensitive to the dilution temperature rather than other particle size ranges. Comparison with particle composition between vehicle speed cycles and regulatory cycle showed that sulfate was slightly increased at regulatory cycle, while other components were relatively similar. During cold start test, semivolatile nucleation particles were increased due to effect of cold environment. Research on particle formation dependent on dilution conditions of diesel passenger cars under the NEDC is important to verify impact on vehicular traffic and secondary aerosol formation in seoul.

关键词： Diesel passenger cars Particle number emissions Correlation analysis Particle number concentration Ultrafine particle number concentration

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ELECTROLYTE-DIFFUsION OF CosO_4 IN AQUEOUs sOLUTIONs

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Nuclear science and Techniques 1992年第4期3卷 282-284页

作者： Nilima s Rajurkar(neeN.G.Adhyapak) Ashok V borhade Vinayak b Ugale University of Poona Pune-411 007India

Electrolyte-diffusion of CosO4 in pure aqueous solution is studied at 25 ℃ over a concentration range of 10-5-0.25 mol/l. The measurement of diffusion coefficients are done by improved capillary technique without sti... 详细信息

关键词： Diffusion coefficient Onsager-Fuoss theory CosO4 Electrolyte diffusion

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Flow characteristics of aluminum coated boron steel in hot press forming

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中国有色金属学会会刊：英文版 2009年第4期19卷 913-916页

作者： Jeong-Hwan JANG Jae-Ho lee bye ong-Don JOO Young-Hoon MOON school of Mechanical Engineering Pusan National University

The flow characteristics of aluminum coated boron steel in hot press forming were ***,the effects of aluminum coated layer on press forming were analyzed during deep *** results show that aluminum coated boron steel exhibits a high sensitivity on temperature and strain *** coating layer appears in surface flaking in a temperature range of 700-800 ℃,but smooth surface is formed above 900 ℃.

关键词：热压成型流动特性铝涂层硼钢表面剥落温度范围冲压成形高灵敏度

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Experimental demonstration of nonlinear quantum metrology with optimal quantum state

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science bulletin 2018年第8期63卷 469-476页

作者： Xinfang Nie Jiahao Huang Zhaokai Li Wenqiang Zheng Chaohong lee Xinhua Peng Jiangfeng Du CAs Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics University of Science and Technology of China Hefei National Laboratory for Physical sciences at Microscale University of Science and Technology of China synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Laboratory of Quantum Engineering and Quantum Metrology School of Physics and Astronomy Sun Yat-sen University (Zhuhai Campus) Center for Optics and Optoelectronics Research College of Science Zhejiang University of Technology state Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University (Guangzhou Campus) synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University

Nonlinear quantum metrology may exhibit better precision scalings. For example, the uncertainty of an estimated phase may scale as △φ∝ 1/N2 under quadratic phase accumulation, which is 1/N times smal-ler than the linear counterpart, where N is probe number. Here, we experimentally demonstrate the non-linear quantum metrology by using a spin-I（I 〉 1/2） nuclear magnetic resonance （NMR） ensemble that can be mapped into a system ofN = 2I spin-1/2 particles and the quadratic interaction can be utilized for the quadratic phase accumulation. Our experimental results show that the phase uncertainty can scale as △φ∝1/（N2-1） by optimizing the input states, when N is an odd number. In addition, the interferomet-tic measurement with quadratic interaction provides a new way for estimating the quadrupolar coupling strength in an NMR system. Our system may be further extended to exotic nonlinear quantum metrology with higher order many-body interactions.

关键词： Quantum information Quantum simulation Quantum metrology Quantum Fisher information Nuclear magnetic resonance Quadrupolar nuclei

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Influence of C-Axis Inter Unit Cell Resonant Tunneling on the spectral Function in bilayer Cuprates

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Journal of Modern Physics 2011年第7期2卷 759-765页

作者： Ajay - b. s. Tewari Govind - 不详

The role of intra unit cell coupling along with inter unit cell resonant tunneling between the copper-oxygen planes on the electronic spectral function in normal state of bilayer high Tc cuprates like bi2sr2CaCu2O8+x is investigated. The Hubbard model including terms representing hopping between the planes within the unit cell, and resonant tunneling between the planes in two adjoining cells is used along with the Green’s function equation of motion approach to obtain an expression of spectral function. The spectral function at (π,0) point of the brillouin zone is numerically calculated. It is found that the intra unit cell coupling lead to splitting of spectral peak especially close to (π,0) point, while the inter unit cell resonant tunneling lead to a broadening in the spectral function and suppression of bilayer splitting in the normal state. In the presence of finite electron correlations the inter unit cell tunneling induce strong broadening in the spectral features. The electron correlations and inter unit cell tunneling is important in determining the shape of the spectral function in doped bilayer cuprates. These results are viewed in terms of the existing ARPEs measurements on bilayer cuprates.

关键词： Multilayer superconductors Electronic structure strongly Correlated systems

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Hwangryunhaedoktang exerts anti-inflammation on LPs-induced NO production by suppressing MAPK and NF-κb activation in RAW264.7 macrophages

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Journal of Integrative Medicine 2017年第4期15卷 326-336页

作者： byung Hyuk Han Yun Jung lee Jung Joo Yoon Eun sik Choi seung Namgung Xian Jun Jin Da Hye Jeong Dae Gill Kang Ho s.b.lee College of Oriental Medicine and Professional Graduate school of Oriental Medicine Wonkwang University Hanbang body-fluid Research Center Wonkwang University

ObJECTIVE： This study aimed to evaluate whether Hwangryunhaedoktang （HHT）, a herbal compound, has an inhibitory effect on lipopolysaccharide （LPs）-induced inflammation in RAW264.7 macrophages. METHODs： The effects of HHT were evaluated by confirming nitric oxide （NO） production and expression of inducible NO synthase （iNOs） and mitogen-activated protein kinases （MAPKs） in LPs-stimulated RAW264.7 macrophages via the Griess assay, Western blotting, and real-time reverse transcription quantitative polymerase chain reaction. Western blot analyses and luciferase assays were used to evaluate whether HHT has an effect on the phosphorylation and translocation of nuclear factor-κb （NF-κb）. The secretion and expression of tumor necrosis factor-α （TNF-α） and interleukin-6 （IL-6） were determined via enzyme-linked immunosorbent assay and Western blot analyses. REsULTs： HHT suppressed LPs-induced NO production and expression of iNOs in a dose-dependent manner. Additionally, MAPKs activation was also attenuated via inhibition of phosphorylation of extracellular signal-regulated kinases 1/2, c-Jun N-terminal kinase and p38 which were related to inflammatory pathway. Furthermore, HHT also effectively attenuated NF-κb activation and its translocation to the nucleus, a process that is closely linked to inflammation. LPs normally induced the expression of inflammatory cytokines such as TNF-α and IL-6, but the secretion and expression of TNF-α and IL-6 were significantly attenuated by pretreating the cells with HHT. CONCLUsION： HHT suppressed LPs-induced NO production by blocking the activation of NF-κb and MAPK signaling pathways in RAW264.7 macrophages. Furthermore, HHT may have an anti-inflammatory effect by suppressing the LPs-induced secretion of TNF-α and IL-6. Therefore, the traditional herbal formula HHT might be a useful potential therapeutic agent for inflammation.

关键词： medicine, Chinese traditional lipopolysaccharide nitric oxide nuclear factor-κb mitogen-activatedprotein kinases tumor necrosis factor-a inflammation

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Intelligent reflecting surface for sum rate enhancement in MIMO systems

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Digital Communications and Networks 2024年第1期10卷 94-100页

作者： Chan-Yeob Park Ji-sung Jung Yeong-Rong lee beom-sik shin Hyoung-Kyu song Department of Information and Communication Engineering Sejong UniversitySeoulGwangjin-guGunja-dong 98Republic of Korea Department of Convergence Engineering for Intelligent Drone sejong University SeoulGwangjin-guGunja-dong 98Republic of Korea

The research for the Intelligent Reflecting surface(IRs)which has the advantages of cost and energy efficiency has been *** capacity can be effectively increased by appropriately setting the phase value of IRs elements according to the channel ***,the problem of obtaining an appropriate phase value of IRs is difficult to solve due to the non-convex *** paper proposes an iterative algorithm for the alternating optimal solution in the single User Multiple-Input-Multiple-Output(sU-MIMO)*** proposed iterative algorithm finds an alternating optimal solution that is the phase value of IRs one by *** results show that the proposed method has better performance than that of the randomized IRs *** number of iterations for maximizing the performance of the proposed algorithm depends on the channel state between the IRs and the receiver.

关键词： Intelligent reflecting surface MIMO sum rate

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Enhancement of Au–Ag–Te contents in tellurium-bearing ore minerals via bioleaching

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 262-270页

作者： Nag-Choul Choi Kang Hee Cho bong Ju Kim soonjae lee Cheon Young Park Department of Rural systems Engineering Seoul National University Department of Earth and Environmental sciences Korea University Department of Energy and Resource Engineering Chosun University

The purpose of this study was to enhance the content of valuable metals, such as Au, Ag, and Te, in tellurium-bearing minerals via bioleaching. The ore samples composed of invisible Au and Au paragenesis minerals(such as pyrite, chalcopyrite, sphalerite and galena) in combination with tellurium-bearing minerals(hessite, sylvanite and Tellurobismuthite) were studied. Indigenous microbes from mine drainage were isolated and identified as Acidithiobacillus ferrooxidans, which were used in bioleaching after adaption to copper. The effect of the microbial adaption on the bioleaching performance was then compared with the results produced by the non-adaptive process. The microbial adaption enhanced the Au–Ag–Te contents in biological leaching of tellurium-bearing ore minerals. This suggests that bioleaching with adapted microbes can be used both as a pretreatment and in the main recovery processes of valuable metals.

关键词： tellurium-bearing mineral bioleaching adaptation Au–Ag–Te Acidithiobacillus ferrooxidans

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spin squeezing in Dicke-class of states with non-orthogonal spinors

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Chinese Physics b 2019年第6期28卷 66-71页

作者： K s Akhilesh K s Mallesh sudha Praveen G Hegde Department of Physics University of MysoreManasagangotriMysuru-570006KarnatakaIndia Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India Inspire Institute Inc. AlexandriaVirginia 22303USA

The celebrated Majorana representation is exploited to investigate spin squeezing in different classes of pure symmetric states of N qubits with two distinct spinors, namely the Dicke-class of states. On obtaining a general expression for spin squeezing parameter, the variation of squeezing for different configurations is studied in detail. It is shown that the states in the Dicke-class, characterized by two-distinct non-orthogonal spinors, exhibit squeezing.

关键词： Majorana representation of pure symmetric multiqubit states spin squeezing Dicke states

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Air Filter simulation by Geodict

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Journal of Donghua University(English Edition) 2006年第5期23卷 45-48页

作者：王新鹏 Kitai Kim Changhwan lee Jooyong Kim Department of Textile and Engineering Soongsil University Seoul 156-743 Korea

In this paper, we discussed the relationship of filter effictency and pressure drop with the porosity, fiber diameter and filter thickness by Oeodict. We found that filter efficiency will increase when filter porosity and fiber diameter decreasing or filter thickness increasing. And the pressure drop has a linear relationship with filter thickness and non-linear relationship with filter porosity and fiber diameter. We also compared the simulation results with the real test results by TsI 3160. Although there are some differences, I think Ocodict can be used to predict filter effictency and pressure drop.

关键词： filter simulation Geodict filter efficiency pressure drop porosity.

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