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Strongly prolonged hydroxyl radical production for Fenton-like reactions: The golden touch of Cu

SEPARATION AND PURIFICATION TECHNOLOGY 2019年 213卷 500-506页

作者： Da, xuwen Ji, Hongwei zhao, Zhenwen Lan, Rongshan Li, Tuo Ma, Jiahai Univ Chinese Acad Sci Sch Chem Sci Beijing 100049 Peoples R China Chinese Acad Sci Inst Chem Key Lab Photochem Beijing 100190 Peoples R China Chinese Acad Sci Beijing Mass Spectrum Ctr Inst Chem Beijing 100190 Peoples R China

Hydroxyl radicals are believed as the most reactive species in the Fenton-like reactions and perform well at the beginning stage of the reaction due to very short lifetime. A reaction system with strongly prolonged hydroxyl radical lifetime is rarely reported. Adding Cu ions, an unreactive catalyst for hydrogen peroxide activation, the Fe/Cu/CDBQ/H2O2 system efficiently prolonged hydroxyl radical lifetime with two orders. This study found a strong, prolonged hydroxyl radical generation in a Fenton-like system using iron, copper ions and 2,5-dihydroxy-1,4-benzoquinone restricted in cyclodextrin (CDBQ). Meanwhile, rapid degradation and substantial mineralization of organics was achieved in this system. Further, the Cu ions could promote the efficiency of other Fenton-like system.

关键词： Hydroxyl radical Fenton reaction Copper ion

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Study on Mechanical Behavior of Masonry Wall in School Building Reinforced by CFRP

Study on Mechanical Behavior of Masonry Wall in School Build...

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International Conference on Materials Engineering and Mechanical Automation (MEMA 2013)

作者： Lin, Hong Yang, zhao Wang, xuwen Ke, Xiang Wuhan Univ Technol Design & Res Inst Wuhan 430070 Peoples R China Wuhan Univ Sci & Technol Inst Urban Construct Wuhan Peoples R China

ISBN: (纸本)9783037859018

CFRP is a new kind of building materials popularly used in structure strengthening. In order to study the reinforcement technique for masonry walls of school buildings, the walls with window opening strengthened by CFRP were studied in the paper. Based on the experiment result, the finite element simulation and theoretical calculation analysis were done to study the mechanical behavior and shear capacity of the wall with window opening reinforced by CFRP. The CFRP pasted at the corner of window opening were proved to be effectively in improving shear capacity of the walls, and simple calculation formulas of shear capacity were provided in the paper, which proved to be accurate.

关键词： CFRP Masonry structure Mechanical behavior Shear capacity

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Impacts of simulated acid rain on soil organic matter and metal aluminum and iron ions leaching from red soil in central south China

Impacts of simulated acid rain on soil organic matter and me...

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International Conference on Manufacture Engineering and Environment Engineering (MEEE)

作者： Tian, Wenjie zhao, Fangni He, xuwen Li, Fasheng China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing Peoples R China Luoyang Inst Sci & Technol Dept Environm Engn Chem Luoyang Peoples R China Chinese Res Inst Environm Sci Beijing Peoples R China

ISBN: (纸本)9781845648251;9781845648244

Acid rain is a problem of increasing agricultural, environmental, and ecological concerns worldwide. This study investigated impacts of simulated acid rain (SAR) on soil organic matter (SOM) and metal aluminum and iron ions leaching from the red soil in central south China. Laboratory experiments were performed by leaching the soil columns with the SAR at a pH range from 2.5 to 5.6 over a 20-day period. Research results showed subjected to acid rain of different acidities, dissolved organic matter (DOM), Fe and Al ions were leached out from red soil into eluate, huge leaching loss tended to occur in the initial phase of the leaching and the higher the acidity of simulated acid rain was, the bigger the loss of them from red soil. There was a very good linear correlation between DOMs and dissolved Al and Fe in the eluates, squared correlation coefficient (R-2) were respectively 0.93839 and 0.9479. These results contributed to build the theoretical foundation for assessing the potential environmental risks of groundwater.

关键词： simulated acid rain red soil soil organic matters (SOM) inorganic aluminum iron

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Upwelling and anthropogenic forcing on phytoplankton productivity and community structure changes in the Zhejiang coastal area over the last 100 years

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Acta Oceanologica Sinica 2014年第10期33卷 1-9页

作者： DUAN Shanshan XING Lei ZHANG Hailong FENG xuwen YANG Haili zhao Meixun Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China) Ministry of Education Qingdao Collaborative Innovation Center of Marine Science and Technology Second Institute of Oceanography State Oceanic Administration

Phytoplankton productivity and community structure in marginal seas have been altered significantly during the past three decades, but it is still a challenge to distinguish the forcing mechanisms between climate change and anthropogenic activities. High time-resolution biomarker records of two 210Pb-dated sediment cores（#34： 28.5°N, 122.272°E; CJ12-1269： 28.861 9°N, 122.515 3°E） from the Min-Zhe coastal mud area were compared to reveal changes of phytoplankton productivity and community structure over the past 100 years. Phytoplankton productivity started to increase gradually from the 1970 s and increased rapidly after the late 1990 s at Site #34; and it started to increase gradually from the middle 1960 s and increased rapidly after the late 1980 s at Site CJ12-1269. Productivity of Core CJ12-1269 was higher than that of Core #34. Phytoplankton community structure variations displayed opposite patterns in the two cores. The decreasing D/B（dinosterol/brassicasterol） ratio of Core #34 since the 1960 s revealed increased diatom contribution to total productivity. In contrast, the increasing D/B ratio of Core CJ12-1269 since the 1950 s indicated increased dinoflagellate contribution to total productivity. Both the productivity increase and the increased dinoflagellate contribution in Core CJ12-1269 since the 1950–1960s were mainly caused by anthropogenic activities, as the location was closer to the Changjiang River Estuary with higher nutrient concentration and decreasing Si/N ratios. However, increased diatom contribution in Core #34 is proposed to be caused by increased coastal upwelling, with higher nutrient concentration and higher Si/N ratios.

关键词： biomarkers phytoplankton community structure Min-Zhe coastal mud area Changjiang Diluted Water upwelling

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HPV vaccination strategy for 14-year-old females and economic returns for cervical cancer prevention in Wuxi City, China: a cost effectiveness analysis

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COST EFFECTIVENESS AND RESOURCE ALLOCATION 2024年第1期22卷 1页

作者： Jiang, Jingfeng zhao, Fanqi Hong, Xiang Wang, xuwen Nanjing Med Univ Wuxi Ctr Dis Control & Prevent Affiliated Wuxi Ctr Dis Control & Prevent Wuxi 214023 Peoples R China Southeast Univ Minist Educ Sch Publ Hlth Dept Epidemiol & Hlth StatKey Lab Environm Med & Nanjing Peoples R China

Background Since December 2021, Wuxi, China has offered a two-dose human papillomavirus (HPV) vaccination to 14-year-old females for free. This study evaluated the costs and benefits of this vaccination scheduled in the Expanded Program on Immunization in Wuxi from the perspective of the cities' demographic characteristics, economic development, and policy support. Methods The model-based economic evaluation used TreeAge Pro software to construct a decision tree-Markov model for the vaccination strategy in which 100,000 14-year-old females received two doses of bivalent HPV vaccine or no vaccination. Costs and effects of the strategy were assessed from a societal perspective through literature research and data obtained from the Wuxi Centre for Disease Control and Prevention. Univariate, multivariate, and probabilistic sensitivity analyses assessed the stability of the findings. Results The cost of the bivalent HPV vaccine in Wuxi is 711.3 CNY. The two-dose of bivalent HPV vaccine for 100,000 14-year-old females would cost an additional 658,016 CNY compared to no vaccination, but would result in 1,960 Quality Adjustment Years of Life (QALYs). Using the per capita gross domestic product of 187,415 CNY in 2021 in Wuxi as the willingness-to-pay threshold, the vaccination strategy costs 3,357.37 CNY per QALY gained, which is much lower than the threshold, suggesting that it is a very cost-effective strategy. In addition, the vaccine strategy reduced the incidence of cervical cancer by 300 cases and cervical cancer deaths by 181 cases, representing a benefit-cost ratio of 2.86 (> 1) when health output outcomes were measured in monetary terms. These results suggested that the vaccination strategy was advantageous. Sensitivity analyses showed that changes in the parameters did not affect the conclusions and that the findings were robust. Conclusions Compared to no vaccination, the delivery of two doses of bivalent HPV vaccine for 14-year-old females was a more highly cost-

关键词： Cost-effectiveness HPV Cervical cancer Vaccination

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Simple Bronsted acid catalyzed C-H functionalization: efficient access to poly-substituted pyridines

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TETRAHEDRON LETTERS 2016年第27-28期57卷 2957-2961页

作者： Lai, Shujun Ren, xuwen zhao, Jinzhong Tang, Zhuo Li, Guangxun Shanxi Agr Univ Taigu Coll Art & Sci Taigu 030800 Shanxi Peoples R China Chinese Acad Sci Chengdu Inst Biol Nat Prod Res Ctr Chengdu 610041 Sichuan Peoples R China

An exceptionally simple and environmentally friendly methodology has been developed for directly functionalizing the benzylic C-H bond of the poly-substituted pyridines with aromatic imines. Simple Bronsted acid catalysts including salicylic acid and TsOH were successfully employed. Different types of poly-substituted pyridines could be efficiently obtained with moderate yields. Traditional ways to such types of pyridines involved the aromatization of the corresponding Hantzsch 1,4-dihydropyridines, while this method greatly simplified the synthetic procedures. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Hantzsch 1,4-dihydropyridine C-H functionalization Imine Poly-substituted pyridine

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Selectively Lighting Up Singlet Oxygen via Aggregation-Induced Electrochemiluminescence Energy Transfer

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ANALYTICAL CHEMISTRY 2022年第8期94卷 3718-3726页

作者： Gao, xuwen zhao, Huimin Wang, Dongyang Xu, Yuqi Zhang, Bin Zou, Guizheng Shandong Univ Sch Chem & Chem Engn Jinan 250100 Peoples R China Shandong Normal Univ Shandong Prov Engn & Tech Ctr Light Manipulat Sch Phys & Elect Shandong Prov Key Lab Opt & Photon Device Jinan 250100 Peoples R China

Singlet oxygen (O-1(2)) is an important reactive oxygen species (ROS) that is intensively involved in natural photochemical and photobiological processes. Herein, selectively lighting up O-1(2) is achieved in the aggregation-induced emission (AIE) of electrochemiluminescence (ECL) from the Zn2+-mediated AIE assembly of Au nanoclusters (Zn2+-AIE-AuNCs). Zn2+-AIE-AuNCs can exhibit efficient AIE ECL and photoluminescence (PL) along with O-1(2) generation in energy and charge transfer routes, respectively. The AIE ECL of the Zn2+-AIE-AuNCs/tripropylamine (TEA) system in carbonate buffer is located around 703 nm with the dimeric aggregate of O-1(2) as an emitter because electrochemically oxidizing coexisted Zn2+-AIE-AuNCs and TEA in carbonate buffer would promote the oxygen vacancy (Ov) of Zn2+-AIE-AuNCs, which could selectively enable the generation of emissive singlet oxygen in the energy transfer route by effectively transferring the energy from excited singlet Zn2+-AIE-AuNCs to the triplet ground state of dissolved oxygen (O-3(2)). No emissive O-1(2) is detected via electrochemically oxidizing the Zn2+-AIE-AuNCs in the case without either carbonate buffer or TEA, and the Zn2+-AIE-AuNCs/TEA system can only exhibit AIE ECL around 485 nm with Zn2+-AIE-AuNCs as the emitter in carbonate-free buffers. Photoexciting Zn2+-AIE-AuNCs merely brings out band-gap-engineered AIE PL around similar to 485 nm with Zn2+-AIE-AuNCs as the emitter, which manifests that the O-1(2) generated in the charge transfer route via photoexciting Zn2+-AIE-AuNCs is un-emissive. This work not only proposes an effective strategy for AIE with O-1(2) as an emitter but also opens a promising way to selectively light up O-1(2).

关键词： Energy Electrochemiluminescence Aggregation-induced emission Singlet oxygen

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Code Conversion Method on Process-in-Memory Platform 3

Code Conversion Method on Process-in-Memory Platform

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3rd International Conference on Applied Mathematics, Modeling and Simulation (AMMS)

作者： Liu, Jinhui zhao, Chen Du, Fangzhou Liu, xuwen Xidian Univ Dept Comp Sci & Technol Xian 710126 Shaanxi Peoples R China

Process-in-Memory (PIM) has become a favorable solution for data intensive applications with its advantages of placing processing units in or near memory, reducing the movement of data between memory and processing unit. However, most recent PIM platforms have relatively large limitations in terms of computing flexibility and types of computing, and programming is complicated, which cannot provide a unified programming framework. Therefore, it becomes a challenge to deploy the code to the hardware, which severely restricts the application development on the PIM platform. This paper presents a method of code conversion based on the PIM platform, which allows users to develop applications on the PIM platform with the high-level programming language, makes the PIM platform more accessible in the development of data intensive applications.

关键词： PIM code conversion method NNs Algorithm library

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Resource engineering practice of mine water

Resource engineering practice of mine water

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作者： zhao, Shuguang Li, Fuqin He, xuwen School of Chemical and Environmental Engineering China University of Mining Technology Beijing 100083 China School of City Construction Hebei University of Engineering Handan 056038 China

ISBN: (纸本)9783860090664

The design parameters and the operational aspects of mine water disposal project in Fengxi Xinyu coal mine were introduced. The primary disposal process included neutralization, coagulation settling and mechanical filtration process, and reverse osmosis (RO) process for desalination were used to treat mine water with high-turbidity, high-hardness and high-salinity. The results showed that the pretreated mine water could be used for washing coal, and the quality of permeate liquid of RO for water with milk excelled the national standards for drinking water. New water source was supplied to the coal mine, the recycle of mine water was resource engineering practice.

关键词： Coagulation

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Limb remote ischemic postconditioning protects against focal ischemia in rats

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BRAIN RESEARCH 2009年 1288卷 88-94页

作者： Ren, Chuancheng Yan, Zhimin Wei, Dingtai Gao, xuwen Chen, Xiaoyuan zhao, Heng Stanford Univ Dept Neurosurg Sch Med Stanford CA 94305 USA Stanford Univ Dept Radiol Stanford CA 94305 USA Stanford Univ Dept Stanford Stroke Ctr Stanford CA 94305 USA Fudan Univ Dept Neurol Shanghai Hosp 5 Shanghai Med Sch Shanghai 200433 Peoples R China

Remote ischemic postconditioning (RIP) refers to an ischemia conducted in a distant organ that protects against a prior ischemia in another organ. We tested whether RIP protects against focal ischemia in the rat brain. Stroke was generated by a permanent occlusion of the left distal middle cerebral artery combined with a 30-min occlusion of the bilateral common carotid arteries (CCA) in male rats. After CCA release, RIP was generated by three cycles of 15-min occlusion/15-min release of the left-hind femoral artery. The results showed that rapid RIP performed immediately after CCA release reduced infarction by 67% measured at 2 days after stroke. In addition, delayed RIP initiated as late as 3 h, but not 6 h, still robustly reduced infarction by 43% 2 days after stroke. RIP's protective effect was abolished by injecting the protein synthesis inhibitor, cycloheximide, and the afferent nerve blocker, capsaicin, suggesting that RIP blocks ischemic injury by modulating protein synthesis and nerve activity. Nevertheless, rapid RIP did not reduce infarction size 2 months after stroke while it ameliorated the outcome of the behavioral test. In conclusion, RIP attenuates brain injury after focal ischemia. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Stroke Cerebral ischemia Preconditioning Remote postconditioning

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