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Chemical composition and size distribution of secondary organic aerosol formed from the photooxidation of isoprene

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Journal of Environmental Sciences 2009年第11期21卷 1525-1531页

作者： LIU Xianyun, zhang Weijun, WANG Zhenya, ZHAO Weixiong, TAO Ling, YANG Xibin Laboratory of Environmental Spectroscopy, anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. [a]Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

Photooxidation of isoprene leads to the formation of secondary organic aerosol （SOA）. In this study, the chemical composition of SOA formed from OH-initiated photooxidation of isoprene has been investigated with gas chromatography/mass spectrometry （GC/MS） and a home-made aerosol time-of-fiight mass spectrometer. Sampling particles generated in a home-made smog chamber. The size distribution of SOA particles was detected by a TSI 3321 aerodynamic particle size spectrometer in real time. Results showed that SOA created by isoprene photooxidation was predominantly in the form of fine particles, which have diameters less than 2.5 μm. The obtained mass spectra of individual particles show that products of the OH-initiated oxidation of isoprene contain methyl vinyl ketone, methacrolein, formaldehyde, and some other hydroxycarbonyls. The possible reaction mechanisms leading to these products were also discussed.

关键词： secondary organic aerosols isoprene aerosol time-of-fiight mass spectrometer smog chamber size distribution

Research on the Welding Process of 590MPa Grade High Strength Automobile Beam Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 983-986页

作者： zhang Wu,HU Xue-wen,LIU Yong-gang,YANG Xing-liang,zhang Jian (Technological Center,Maanshan Iron & Steel Co.,Ltd.,Maanshan243000,anhui,China) Maanshan Iron & Steel Co Ltd Ctr Technol Maanshan 243000 Anhui Peoples R China

590 MPa automobile beam steel strips are used mainly to manufacture the longitudinal beam of ***’s welding properties are critical to the safety of *** microstructure and mechanical properties of welding joints processed by CO 2 arc welding with different welding parameters were *** results showed that the welding joints were weak when welding heat input were small and the non metal inclusions were found in the weld joints when welding heat input are *** quality of the welding joints is good enough at 170A of the arc current and 24V of the arc *** the other welding parameters fixed,the incomplete fusion defect occurred in the welding joint with backward welding,but the quality of the welding joint is good with forward welding.

关键词： automobile beam steel CO 2 arc welding welding process

Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第01期 317-328页

作者： Qingmin Yang Jian Zhao Yujia zhang Xingyu Zhou Hao Ren Bowen Hu Zhongli Lei Lixin Chen Peng Yang School of Material and Chemical Engineering Bengbu University anhui Provincial Engineering Laboratory of Silicon-Based Materials School of Chemistry and Chemical Engineering Northwestern Polytechnical University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical Engineering Shaanxi Normal University International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal University

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular economy. Herein, we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal ions. Our method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical reagents. Amyloid-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces, resulting in a remarkable ～3.1 times improvement in the adsorption capacity of fly ash, a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB). The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins, activated carbon(AC), covalent organic frameworks(COFs), and metal-organic frameworks(MOFs). We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste leachates. Consequently, this strategy could increase the value of waste materials nearly 27 times. In addition, this method is generally extendable to other conventional industrial adsorbents such as resin, clay, and Al2O3, and enhances their adsorption capabilities at least twofold. Overall, this work provides a simple and green approach for improving the adsorption performance of solid particles, and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

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Effect of illumination intensity and light application time on secondary organic aerosol formation from the photooxidation of α-pinene

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Journal of Environmental Sciences 2009年第4期21卷 447-451页

作者： LIU Xianyun, zhang Weijun, HUANG Mingqiang, WANG Zhenya, HAO Liqing, ZHAO Wenwu Laboratory of Environment Spectroscopy, anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei 230031, China. [a]Laboratory of Environment Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

Secondary organic aerosol （SOA） formation from hydroxyl radical （OH.） initiated photooxidation of α-pinene was investigated in a home-made smog chamber. The size distribution of SOA particles was measured using aerodynamic particle sizer spectrometer. The effects of illumination intensity and light application time on SOA formation for α-pinene were evaluated. Experimental results show that the concentration of SOA particles increased significantly with an increasing of illumination intensity, and the light application time, the concentration, and the size of SOA particles were also increased. In addition, the factors influencing the formation of SOA were discussed. In addition, this article compared the effect of α-pinene with that of toluene, and discussed the contribution of α-pinene to SOA formation.

关键词： α-pinene hydroxyl radical secondary organic aerosol size distribution

The Influence of the Local-Exchange Potential on the Generalized Oscilator Strength for Electron-Impact Excitation of Krypton

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原子与分子物理学报 1998年第S1期15卷 149-150页

作者： zhang Suimeng1 Chen zhangjin2 Xu Kezun21 Department of Physics, Lu’an Teacher’s college, Lu’an, anhui, 2370122 Department of Modern Physics, University of Science and Technology of China, Hefei, anhui, 230026

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Ｔｈｅａｂｓｏｌｕｔｅｇｅｎｅｒａｌｉｚｅｄｏｓｃｉｌａｔｏｒｓｔｒｅｎｇｔｈｓ（ＧＯＳ’ｓ）ｆｏｒｔｈｅｅｘｃｉｔａｔｉｏｎｏｆｔｈｅｋｒｙｐｔｏｎｇｒｏｕｎｄｓｔａｔｅｔｏｔｈｅ４ｐ５（２Ｐ１／２）５ｓａｎｄ４ｐ５（２Ｐ３／２）５ｓｓｔａｔｅｓｗ...

关键词： generalized oscillator strength inelastic-scatteringelectron-impct excitation

Effect of leflunomide on immunological liver injury in mice

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World Journal of Gastroenterology 2003年第2期9卷 320-323页

作者： Hong-Wei Yao Jun Li Yong Jin Yun-Fang zhang Chang-Yu Li Shu-Yun Xu Institute of Clinical Pharmacology, anhui Medical University, Heifei 230032, anhui Province, China School of Pharmacy, anhui Medical University, Heifei 230032, anhui Province, China Institute of Clinical Pharmacology Anhui Medical University Heifei 230032 Anhui Province China.

AIM: To study the effect of leflunomide on immunologicalliver injury (ILI) in ***: ILI was induced by tail vein injection of 2.5 mgBacilluS Calmette-Guerin (BCG), and 10 d later with :L0 μglipopolysaccharide (LPS) in 0.2 mL saline (BCG+LPS). Thealanine aminotransferase (ALT), aspartate aminotransferase(ASr), nitric oxide (NO) level in plasma and molondiadehyde(MDA), glutathione peroxidase (GSHpx) in liver homogenatewere assayed by spectroscopy. The serum content of tumornecrosis factors-α (TNF-α) was determined by ***-1 (IL-1), interleukin-2 (IL-2) and ConcanavalinA (ConA)-induced splenocyte proliferation response weredetermined by methods of 3H-infiltrated cell ***: Leflunomide (4, 12, 36 mg@kg-1) was found tosignificantly decrease the serum transaminase (ALT, AST)activity and MDA content in liver homogenate, and improvereduced GSHpx level of liver homogenate. Leflunomide (4,12, 36 mg@kg-1) significantly lowered TNF-α and NO level inserum, and IL-1 produced by intraperitoneal macrophagesinduced splenocyte proliferation response were ***: These findings suggested that leflunomidehad significant protective action on ILI in mice.

关键词：免疫性肝损伤动物模型来氟米特免疫抑制剂药理作用细胞因子

EXISTENCE OF INFINITE PERIODIC SOLUTIONS TO A KIND OF p-LAPLACIAN DIFFERENTIAL EQUATION WITH DEVIATING ARGUMENTS

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Annals of Differential Equations 2010年第4期26卷 494-501页

作者： Min Zhu, Xiufeng zhang, Shiping Lu (Dept. of Math., anhui Normal University, Wuhu 241000, anhui)

In this paper, we study a kind of p-Laplacian differential equation and obtain some new results on the existence of infinite periodic solutions.

关键词： p-Laplacian equation critical point theorem PS condition periodic solution

ON THE DEVELOPMENT STRATEGIES OF DISASTER REDUCTION EDUCATION

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Natural Disaster Reduction in China 1996年第2期 63-67页

作者： zhang Yaoxi (Chizhou Normal School of anhui Province)

ＯＮＴＨＥＤＥＶＥＬＯＰＭＥＮＴＳＴＲＡＴＥＧＩＥＳＯＦＤＩＳＡＳＴＥＲＲＥＤＵＣＴＩＯＮＥＤＵＣＡＴＩＯＮＺｈａｎｇＹａｏｘｉ（ＣｈｉｚｈｏｕＮｏｒｍａｌＳｃｈｏｏｌｏｆＡｎｈｕｉＰｒｏｖｉｎｃｅ）Ｉ．ＩｔＩｓＩｍ...

ＯＮＴＨＥＤＥＶＥＬＯＰＭＥＮＴＳＴＲＡＴＥＧＩＥＳＯＦＤＩＳＡＳＴＥＲＲＥＤＵＣＴＩＯＮＥＤＵＣＡＴＩＯＮＺｈａｎｇＹａｏｘｉ（ＣｈｉｚｈｏｕＮｏｒｍａｌＳｃｈｏｏｌｏｆＡｎｈｕｉＰｒｏｖｉｎｃｅ）Ｉ．ＩｔＩｓＩｍｐｅｒａｔｉｖｅｔｏＤｅｖｅｌｏｐ...

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A Parallel Indexing Cam Mechanism with Internal Placed Followers

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武汉理工大学学报 2006年第S2期28卷 533-537页

作者： zhang Yuhua REN Guangfa (School of Mechanical Engineering,anhui University of Technology,Ma’anshan 243002,China School of Mechanical Engineering Anhui University of TechnologyMa'anshan 243002China

A new type of parallel indexing cam mechanism is *** composition of the cam profile is proposed and the formulas of the mechanism parameters are established by synthesis of its configuration and *** equations for working pro- file and pressure angle of the cam are derived based on the inverse model and the derivative of pitch curve of *** example is given and demonstrates that it is available to design the new mechanism using the derived expressions.

关键词： cam mechanism parallel Indexing cam Internal cam mechanism synthesis internal placed followers