The mechanical processing of steel bars is an important secret information processing process in the building structure, and the mechanical processing of steel bars is an important part in every link of reinforced con...The mechanical processing of steel bars is an important secret information processing process in the building structure, and the mechanical processing of steel bars is an important part in every link of reinforced concrete construction engineering. It can be said that the brand or not in the steel bar processing process directly affects the quality of the whole construction project. In order to effectively control the accuracy and quality of steel bar processing, it is necessary to be familiar with the design, construction drawings and specification requirements of steel bars, and to combine various physical characteristics of steel bars when they are bent. From the aspects of steel bar bending and welding control, the mechanical characteristics of steel bar structure should fully meet the requirements of the specification, and flexibly master various processing technologies and use in the manufacturing process of steel bars. In this paper, the main measures of steel bar quality management and control are mainly elaborated through the practice of semi-inverted T-shaped hidden capping beam in steel bar quality control, and on this basis, this paper summarizes and analyzes it, which provides technical basis and reference for similar engineering reinforcement construction.展开更多
The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol （CAP） in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degrada...The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol （CAP） in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degradation of CAP under electron beam irradiation followed pseudo-first-order kinetics. Redox reactions of CAP aqueous solutions with hydroxyl radicals （.OH）, hydrated electrons （eaq） and hydrated atoms （·H） were studied. The increase of the additives would result in the decrease of the degradation efficiency. The concentration of Cl- and NO3- in aqueous solution increased after electron beam irradiation. On the basis of the experimental results, a photocatalytic mechanism was discussed. The rate constant for reactions of .OH and CAP was 9.36×10^7 L/（mol.s） and for reaction of eaq and CAP was 7.33×10^7 L/（mol.s）..OH was supposed to play the key role in the radiation system of aqueous solution. Other free radicals like eaq and .H could also initiate the degradation.展开更多
文摘The mechanical processing of steel bars is an important secret information processing process in the building structure, and the mechanical processing of steel bars is an important part in every link of reinforced concrete construction engineering. It can be said that the brand or not in the steel bar processing process directly affects the quality of the whole construction project. In order to effectively control the accuracy and quality of steel bar processing, it is necessary to be familiar with the design, construction drawings and specification requirements of steel bars, and to combine various physical characteristics of steel bars when they are bent. From the aspects of steel bar bending and welding control, the mechanical characteristics of steel bar structure should fully meet the requirements of the specification, and flexibly master various processing technologies and use in the manufacturing process of steel bars. In this paper, the main measures of steel bar quality management and control are mainly elaborated through the practice of semi-inverted T-shaped hidden capping beam in steel bar quality control, and on this basis, this paper summarizes and analyzes it, which provides technical basis and reference for similar engineering reinforcement construction.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.40973073,40830744)the Shanghai Leading Academic Discipline Project(Grant No.S30109)+1 种基金the National Key Technology Research and Development Program in the 11th Five Year Plan of China(Grant Nos.2008BAC32B03,2009BAA24B04)the Natural Science Foundation of Shanghai Municipality(Grant Nos.09ZR1411300,09XD1401800)
文摘The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol （CAP） in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degradation of CAP under electron beam irradiation followed pseudo-first-order kinetics. Redox reactions of CAP aqueous solutions with hydroxyl radicals （.OH）, hydrated electrons （eaq） and hydrated atoms （·H） were studied. The increase of the additives would result in the decrease of the degradation efficiency. The concentration of Cl- and NO3- in aqueous solution increased after electron beam irradiation. On the basis of the experimental results, a photocatalytic mechanism was discussed. The rate constant for reactions of .OH and CAP was 9.36×10^7 L/（mol.s） and for reaction of eaq and CAP was 7.33×10^7 L/（mol.s）..OH was supposed to play the key role in the radiation system of aqueous solution. Other free radicals like eaq and .H could also initiate the degradation.
