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Dechlorination of carbon tetrachloride by the catalyzed Fe-Cu process

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Journal of Environmental Sciences 2007年第7期19卷 792-799页

作者： XU Wen-ying gao Ting-yao The National Engineering Research Center for Urban Pollution Control Tongji University Shanghai 200092 China.

The dectrochemical reduction characteristics of carbon tetrachlofide （CT） were investigated using cyclic voltammetry in this study. In addition, the difference in reduction mechanisms of CT between Master Builders＇ iron and the catalyzed Fe-Cu process was discussed. The results showed that CT was reduced directly on the surface of copper rather than by atomic hydrogen produced at the cathode in the catalyzed Fe-Cu process. The reduction was realized largely by atomic hydrogen in Master Builders＇ iron. The entire CT in 350 ml aqueous solution with 320 mg/L was reduced to trichloromethane and dichloromethane in 2.25 h when 100 g of scrap iron with Fe/Cu ratio of 10：1 （w/w） were used. Moreover, the reduction rate slowed with time. CT could be reduced at acidic, neutral and alkaline pH from solution by Fe-Cu bimetallic media, but the mechanisms were different. The degradation rate was not significantly influenced by pH in the catalyzed Fe-Cu process; in Master Builders＇ iron it clearly increased with decreasing pH. The kinetics of the reductions followed pseudo-first order in both cases. Furthermore, the reductions under acidic conditions proceeded faster than that under the neutral and alkaline conditions. The catalyzed Fe-Cu process was superior to Master Builders＇ iron in treating CT-containing water and this advantage was particularly noticeable under alkaline conditions. The reduction was investigated in the cathode （Cu） and anode （Fe） compartments respectively, the results showed that the direct reduction pathway played an important role in the reduction by the catalyzed Fe-Cu process. The catalyzed Fe-Cu process is of practical value.

关键词： carbon tetrachloride electrochemical reduction characteristics catalyzed Fe-Cu process reduction mechanisms

Electrochemical reduction characteristics and mechanism of nitrobenzene compounds in the catalyzed Fe-Cu process

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Journal of Environmental Sciences 2006年第2期18卷 379-387页

作者： XU Wen-ying FAN Jin-hong gao Ting-yao The National Engineering Research Center for Urban Pollution Control Tongji University Shanghai 200092 China

The reduction of the nitrobenzene compounds （NBCs） by the catalyzed Fe-Cu process and the relationship between the electrochemical reduction characteristics of NBCs at copper electrode and reduction rate were studied in alkaline medium（pH=11）. The catalyzed Fe-Cu process was found more effective on degradation of NBCs compared to Master Builder＇s iron. The reduction rate by the catalyzed Fe-Cu process decreased in the following order： nitrobenzene 〉4-chloro-nitrobenzene ≥m-dinitrobenzene ：〉 4-nitrophenol ≥2,4-dinitrotoluene 〉2-nitrophenol. The reduction rate by Master Builder＇s iron decreased in the following order： m-dinitrobenzene ≥4-chloro-nitrobenzene 〉4-nitrophenol 〉2,4-dinitrotoluene ≈nitrobenzene 〉2-nitrophenol. NBCs were reduced directly on the surface of copper rather than by the hydrogen produced at cathode in the catalyzed Fe-Cu process. The reduction was realized by the hydrogen produced at cathode and Fe（OH）2 in Master Builder＇s iron, It is an essential difference in reaction mechanisms between these two technologies. For this reason, the reduction by the catalyzed Fe-Cu depended greatly on NBC＇s electron withdrawing ability.

关键词： wastewater contaminated by NBCs electrochemical reduction characteristics catalyzed Fe-Cu process reduction mechanism

Combined Effects of Stretching and Nanofillers on the Crystalline Structure and Mechanical Properties of Polypropylene and Single-walled Carbon Nanotube Composite Fibers

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Chinese Journal of Polymer Science 2014年第2期32卷 245-254页

作者： yao gao Gui-ying Zong Hong-wei Bai 傅强 College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Zhejiang Industry & Trade Vocational College

The combined effects of stretching and single-walled carbon nanotubes （SWCNTs） on crystalline structure and mechanical properties were systematically investigated in melt-spun polypropylene （PP） fibers prepared at two different draw ratios. The dispersion, alignment of the SWCNT bundles and interfacial crystalline structure in the composite fibers are significantly influenced by the stretching force during the melt spinning. The nanohybrid shish kebab （NHSK） superstructure where extended PP chains and aligned SWCNT bundle as hybrid shish and PP lamellae as kebab has been successfully obtained in the composite fibers prepared at the high draw ratio and the related formation mechanism is discussed based on the results of morphological observations and 2d-SAXS patterns. Large improvement in tensile strength and modulus has been realized at the high draw ratio due to the enhanced orientation and dispersion of SWCNT bundles as well as the formation of NHSK.

关键词： Stretching SWCNTs Nanohybrid shish kebab Mechanical properties.

Simultaneous nitrogen and phosphorus removal under low dissolved oxygen conditions

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Journal of Environmental Sciences 2001年第1期13卷 46-50页

作者： XIA Si-qing gao Ting-yao ZHOU Zeng-yuan School of Environmental Science and Engineering Tongji UniversityShanghai 200092China

A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent meas of CODCr,, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.

关键词： high concentration activated sludge low dissolved oxygen process nitrogen removal phosphorus removal

Membrane bioreactor process of organic wastewater from brassylic acid manufacturing plant

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Journal of Environmental Sciences 2001年第2期13卷 157-163页

作者： WU Zhi chao ZENG Ping WANG Shi feng gao Ting yao State Key Lab.of Polution Cantrol and Resource Reuse Tongj UniversityShanghai 200092China.

The wastewater treatment from brassylic acid manufacturing plant using membrane bioreactor (MBR) was studied. The membrane bioreactor consisted of batch-operation biological aeration tank and ultrafiltration evaluation tank. The content of test included the affection of variation operation conditions on ultrafiltration separation, the general characteristics of MBR process, and the difference comparing with the conventional biological treatment. The results are as follows: (1) among the test membrane material, polyether sulphone (PES) membrane is more suitable for the wastewater treatment; (2) when the cutoff molecular weight is among 10000-50000, the higher the cutoff molecular weight, the bigger the water flux is in the test; (3) under the operation pressure, water flux increases accompanying with the increasing of operation pressure; (4) the paper filtered COD concentration has more affection on the water flux than the suspended solid concentration; ( 5) as they volume loading of MBR increases, the accumulation of high molecule organic substance and colloid increases, the membrane,permeate COD concentration and paper filtered COD concentration increase too, meanwhile the water flux reduces; (6) when the sludge retention time of activated sludge of MBR increases, the accumulation of high molecule organic substance and colloid reduces, the membrane permeate (:OD concentration and paper filtered COD concentration reduce too, and the water flux increases; (7) comparing with the conventional biological process, the microbial activity is higher, but the microbial species is less.

关键词： biological treatment membrane bioreactor brassylic acid wastewater

The design of the superconducting wiggler power supply system for HEPS-TF

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Radiation Detection Technology and Methods 2019年第3期3卷 106-111页

作者： Xu Wang Fengli Long yao gao Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose This paper describes the design of power supply system for superconducting wiggler in the project of high energy photon source-test *** includes three sets of high precision DC stabilized current power supplies for superconducting magnet excitation and three sets of quench protection assembly(QPA).A special magnetic load which has a very large time constant is studied in this *** this paper,a stable superconducting excitation power supply is developed,which can adjust the response quickly under the condition of very large load time ***,the energy dissipation circuit of the QPA is integrated into the power supply in an active quenching protection mode to accelerate the energy release of the superconducting magnet and protect the superconducting *** The main circuit topology,control algorithm,quenching protection circuit and interlocking logic function are designed for the superconducting magnet with large *** upper computer controls the switch of the three main power circuits through the serial port,sets the output current and adjusts the parameters according to the *** Through a series of scientific and rigorous experiments,the rationality of superconducting wiggler magnet power supply scheme is *** output current stability test and output voltage ripple test of the power supply meet or exceed the requirements of the magnet system.

关键词： HEPS-TF Superconducting magnet power supply Quench protection assembly

A Network Pharmacology Approach to Decipher the Mechanisms of Anti-depression of Xiaoyaosan Formula

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World Journal of Traditional Chinese Medicine 2018年第4期4卷 147-180页

作者： yao gao Li gao Jun-Sheng Tian Xue-Mei Qin Xiang Zhang Modern Research Center for Traditional Chinese Medicine Shanxi UniversityTaiyuan 030006China Shanxi Key Laboratory of Active Constituents Research and Utilization of TCM Shanxi UniversityTaiyuan 030006China Departments of Chemistry University of LouisvilleLouisvilleKY 40292USA

Objective: Depression is one of the prevalent and prominent complex psychiatric diseases, and the number of depressed patients has been on the rise globally during the recent ***, as a famous Chinese herbal formula, has been widely used in depression patients for a long ***, the therapeutic mechanisms remain uncertain because of the difficulty of depression pathophysiology and the lack of bioinformatic approach to understand the molecular *** and Methods: In this thesis, we applied a network pharmacology approach to explain the potential mechanisms between Xiaoyaosan and depression involved in oral bioavailability screening, drug-likeness assessment, caco-2 permeability, blood–brain barrier target recognition, and network ***: Sixty-six active compounds in Xiaoyaosan formula with favorable pharmacokinetic profiles are predicted as active compounds for antidepression *** analyses showed that these 66 compounds target 40 depression-associated proteins including especially HTR2A, NR3C1, monoamine oxidase inhibitor B, XDH, and *** proteins are mainly involved in the neuroactive ligand–receptor interaction, serotonergic synapse, cAMP signaling pathways, and calcium signaling ***: The integrated network pharmacology method can provide a new approach for understanding the pathogenesis of depression and uncovering the molecular mechanisms of Xiaoyansan, which will also facilitate the application of traditional Chinese herbs in modern medicine.

关键词： Depression mechanism network pharmacology Xiaoyaosan formula

Design and Implementation of File Access and Control System Based on Dynamic Web

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Wuhan University Journal of Natural Sciences 2006年第5期11卷 1233-1237页

作者： gao Fuxiang yao Lan BAO Shengfei YU Ge College of Information Science and Engineering Northeastern University Shenyang 110004 Liaoning China

A dynamic Web application, which can help the departments of enterprise to collaborate with each other conveniently, is proposed. Several popular design solutions are introduced at first. Then, dynamic Web system is chosen for developing the file access and control system. Finally, the paper gives the detailed process of the design and implementation of the system, which includes some key problems such as solutions of document management and system security. Additionally, the limitations of the system as well as the suggestions of further improvement are also explained.

关键词： file access and control ActiveX role based access control (RBAC) version

Design of digital controller for HEPS corrector power supply

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Radiation Detection Technology and Methods 2023年第3期7卷 387-391页

作者： Xiaoling Guo Fengli Long Chao Han yao gao Wentong Su University of Chinese Academy of Sciences Beijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Purpose In order to realize the control of current closed loop in HEPS corrector power supply,a digital control board is *** The control board uses the latest FPGA to realize digital processing and uses two different AD chips to realize current and voltage sampling,*** order to achieve high-precision closed-loop control,an effective closed-loop control program is *** The controller has been widely used in HEPS projects,and its control effect has been *** In order to realize control and reduce power cost,the controller is *** testing experiments show that the controller has excellent performance,reliable operation and low cost.

关键词： Corrector power supply Digital controller FPGA HEPS