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42 results on '"Wang, ZhongWen"'

21. Alkylation of dihydrofullerenes

Author

Meier, Mark S., Bergosh, Robert G., Gallagher, Megan E., Spielmann, H. Peter, and Wang, Zhongwen

Subjects
Chemistry, Organic -- Research, Alkylation -- Physiological aspects, Carbon allotropes -- Physiological aspects, Hydrogen -- Physiological aspects, Metal ions -- Physiological aspects, Anions -- Physiological aspects, Hydrogen bonding -- Physiological aspects, Carbon -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the fulleride anions. The preparation of these anions by means of deprotonation of fullerene C-H bonds and the alkylation of fullerene ions prepared electrochemically are described.

Published
2002

25. 210 Po distribution after high temperature processes in coal-fired power plants

Author

Luo Zhiping, Wang Zhongwen, Pan Jingshun, Li Jinfeng, Liu Ruirui, Wang Chuangao, Huang Zhijun, Chen Ling, and Pan Ziqiang

Subjects
Flue gas, Waste management, business.industry, Health, Toxicology and Mutagenesis, Fraction (chemistry), General Medicine, 010501 environmental sciences, Coal fired, 010403 inorganic & nuclear chemistry, 01 natural sciences, Pollution, 0104 chemical sciences, Power (physics), Combustion process, Bottom ash, Fly ash, Environmental Chemistry, Environmental science, Coal, business, Waste Management and Disposal, 0105 earth and related environmental sciences
Abstract

In this paper, the distribution of 210Po after high temperature processes in six units of coal-fired power plants (CFPs) were evaluated. The coal, bottom ashes, fly ashes from electrostatic precipitators (ESP), and flue gases from stacks were sampled from four CFPs and analyzed for 210Po contents. The results showed that 210Po was mainly captured by the ESP, with little left in the bottom ash, and a small fraction of 210Po was directly discharged into the environment through the stacks, accounting for 0.06%-0.6%, which was consistent with the reported data. It was also found that part of the 210Po could not be accounted for in the mass balance analysis for the whole combustion process in CFPs, which was also in line with the reported data. The results obtained in this study provided essential basic data for environmental radiological risk analysis for CFPs.

Published
2017

26. Design and Research of Infusion Monitoring System Based on OneNET Platform

Author

Xiang Xiu, Wang Zhongwen, Le Zhang, and Li Quanqiang

Subjects
business.industry, Computer science, Embedded system, Monitoring system, business
Abstract

This paper proposes an infusion monitoring system based on OneNET platform, with Arduino as the core control device, infrared tube to detect the drop rate and number of drops of infusion, non-contact liquid level sensor to detect residual liquid level, load cell detection drug The weight of the liquid, OneNET as the host computer cloud platform, upload data through the ESP8266 module and parse the issuing command, drive the step-by-click to control the drop rate of the drug, and when the value exceeds the standard, the message will be automatically pushed, and the medical staff can grasp the patient infusion in time. The real-time situation ensures the safety and reliability of the infusion process.

Published
2020

27. Installation of Integral Prefabricated Bridge Abutment and Pier with Flexible Water Stop Curtain

Author

Rufa Chen, Weiguo Shen, Wang Zhongwen, Liu Gangliang, Yu Tan, and Bingliu Zhang

Subjects
Pier, Engineering, business.industry, Strategy and Management, 0211 other engineering and technologies, Abutment, 020101 civil engineering, 02 engineering and technology, Building and Construction, Water stop, Structural engineering, Bridge (interpersonal), 0201 civil engineering, 021105 building & construction, Industrial relations, business, Civil and Structural Engineering
Abstract

Construction of the abutment, pier, and pier cap of long cross-sea bridges are challenging in complex marine environments. In the Hong Kong–Zhuhai–Macao Bridge (HZMB) project, an installati...

Published
2018

30. Monoalkylation of C (sub)60 and C (sub)70 with Zn and active alkyl bromides

Author

Wang, Zhongwen and Meier, Mark S.

Subjects
Chemistry, Organic -- Research, Bromides -- Composition, Carbon compounds, Solution (Chemistry), Oxidation-reduction reaction -- Analysis, Zinc, Biological sciences, Chemistry
Abstract

Research has been conducted on C (sub)60. The authors describe solution-phase electron-transfer reaction of C (sub)60 with alpha-bromoacetonitrile, zinc, alpha-bromo ketones, allyl bromide and benzyl bromide in DMF carried out in order to prepare C (sub)60 monoalkylated derivatives.

Published
2003

33. Challenges and trends in the determination of selected chemical contaminants and allergens in food

Author

Krska, Rudolf, primary, Becalski, Adam, additional, Braekevelt, Eric, additional, Koerner, Terry, additional, Cao, Xu-Liang, additional, Dabeka, Robert, additional, Godefroy, Samuel, additional, Lau, Ben, additional, Moisey, John, additional, Rawn, Dorothea F. K., additional, Scott, Peter M., additional, Wang, Zhongwen, additional, and Forsyth, Don, additional

Published
2011
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40. Visible-Light Organophotoredox-Mediated [3 + 2] Cycloaddition of Arylcyclopropylamine with Structurally Diverse Olefins for the Construction of Cyclopentylamines and Spiro[4. n ] Skeletons.

Author

Luo Z, Cao B, Song T, Xing Z, Ren J, and Wang Z

Subjects
Cycloaddition Reaction, Molecular Structure, Alkenes chemistry, Skeleton
Abstract

We developed a visible-light-mediated [3 + 2] cycloaddition of arylcyclopropylamine with structurally diverse olefins using QXPT-NPh as a highly efficient organic photoredox catalyst. We first achieved the use of various alkyl-substituted alkenes in intermolecular [3 + 2] cycloadditions with cyclopropylamine. We also developed a general and efficient strategy for the construction of structurally diverse cyclopentane-based spiro[4. n ] skeletons with 1,3-difunctional groups, which broadly exist in natural products and synthetic molecules. Furthermore, we proposed a hydrogen-bond mode between the arylcyclopropylamine and the photocatalyst QXPT-NPh .

Published
2022
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41. TfOH-catalyzed formal [3 + 2] cycloaddition of cyclopropane 1,1-diesters with nitriles.

Author

Cui B, Ren J, and Wang Z

Subjects
Catalysis, Cyclization, Esters, Molecular Structure, Pyrroles chemistry, Cyclopropanes chemistry, Mesylates chemistry, Nitriles chemistry, Pyrroles chemical synthesis
Abstract

A triflic acid-catalyzed formal [3 + 2] cycloaddition of cyclopropane 1,1-diesters with nitriles was developed. This reaction was expeditious, and the scope of the substituents in both cyclopropanes and nitriles was broad. This supplies an efficient and practical method for the synthesis of 1-pyrrolines.

Published
2014
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42. N-heterocyclic carbene-catalyzed domino ring-opening/redox amidation/cyclization reactions of formylcyclopropane 1,1-diesters: direct construction of a 6-5-6 tricyclic hydropyrido[1,2-a]indole skeleton.

Author

Du D, Li L, and Wang Z

Subjects
Amides chemistry, Catalysis, Cyclization, Cyclopropanes chemistry, Indoles chemical synthesis, Methane analogs & derivatives, Oxidation-Reduction, Heterocyclic Compounds, 3-Ring chemical synthesis
Abstract

Catalyzed by N-heterocyclic carbenes (NHCs), domino ring-opening/redox amidation/cyclization reactions of the readily available formylcyclopropane 1,1-diesters with 2-chloro-1H-indole-3-carboaldehydes were reported. This methodology provides an efficient and direct construction of a 6-5-6 tricyclic hydropyrido[1,2-a]indole skeleton, which can be potentially applied for the synthesis of several types of polycyclic indole alkaloids.

Published
2009
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