Abstract: A metering method based on gas volume fraction fitting for wet natural gas is provided. The method includes fitting relationships between a gas Froude number and Venturi differential pressure and Venturi pressure loss with known data to obtain a gas Froude number calculation formula; dividing the known data according to a size of the gas Froude number; fitting relationships between a gas volume fraction and the Venturi differential pressure and the Venturi pressure loss in sections to obtain a piecewise gas volume fraction calculation formula under different gas Froude numbers; and acquiring, on the basis of the gas Froude number calculation formula and the piecewise gas volume fraction calculation formula, some necessary real-time data to calculate a real-time flow rate of the wet gas. The method avoids the use of a ray flow meter. The advantages of the method include accurate metering, small errors and no radioactive pollution.

Abstract: A method for processing transaction information for a commodity object is provided. The method includes receiving a request for purchasing a commodity object and generating, based on the request, a transaction order. The transaction order may include transaction amount information, information about a first user selling the commodity object, and information about a second user purchasing the commodity object. The method may further include setting an amount of fund in a fund account of the second user to a frozen state, and after a preset time period, transferring the amount of fund to a fund account of the first user. After the amount of fund is set to the frozen state and before the amount of fund is transferred to the fund account of the first user, an income produced by the amount of fund may be calculated and transferred to the fund account of the second user.

Abstract: A method for processing transaction information for a commodity object is provided. The method includes receiving a request for purchasing a commodity object and generating, based on the request, a transaction order. The transaction order may include transaction amount information, information about a first user selling the commodity object, and information about a second user purchasing the commodity object. The method may further include setting an amount of fund in a fund account of the second user to a frozen state, and after a preset time period, transferring the amount of fund to a fund account of the first user. After the amount of fund is set to the frozen state and before the amount of fund is transferred to the fund account of the first user, an income produced by the amount of fund may be calculated and transferred to the fund account of the second user.

Abstract: Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadiene monomers using a rare-earth catalyst system comprising: (a) at least one aliphatic hydrocarbon-soluble organometallic compound comprising at least one metal element chosen from the elements of atomic numbers 51-71 in the periodic table; (b) at least one organoaluminum compound of the formula: AlR1R22, (c) at least one aliphatic hydrocarbon-soluble halogen-containing compound; (d) optionally at least one alkylaluminum alkoxide; and (e) at least one conjugated double bond-containing organic compound, and methods of preparing the rare-earth catalyst system.

Abstract: Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadine monomers using a rare-earth catalyst system comprising (a). at least one aliphatic hydrocarbon-soluble organometallic compound comprising at least one metal element chosen from the elements of atomic numbers 51-71 in the periodic table; (b). at least one organoaluminum compound of the formula: AlR1R22, (c). at least one aliphatic hydrocarbon-soluble halogen-containing compound; (d). optionally at least one alkylaluminum alkoxide; and (e). at least one conjugated double bond-containing organic compound, and methods of preparing the rare-earth catalyst system.