At present,there are few studies on the influence of medium and low water saturation on the capacity of free gas storage.Therefore, this study simulates the multi?round gas injection?soaking?production process through laboratory experiments; The laboratory experiment was carried out to simulate the process of multi?round gas injection?well soaking?production. Combined with the mathematical model and numerical simulation results, the research shows that the reservoir capacity increases with the increase of injection?production rounds, but the increase after single?round injection?production decreases rapidly.When the initial water saturation is higher than 50%, the increase of water saturation is beneficial to the reconstruction of gas storage, but the increase of injection?production capacity and storage capacity is relatively slow in the early stage of reservoir construction. When the initial water saturation is increased from 50% to 85%, the gas saturation is reduced by about 9.27% after 6 injection?production cycles. When the injection?production cycles are increased to 20,30,50 cycles, the free gas storage capacity is increased by about 0.51%,3.33%,6.61%, respectively. The research results are expected to provide reference for the evaluation of injection?production capacity and storage capacity of reservoir?type gas storage.

The effects of polymerization reaction temperature, polymerization reaction time, catalyst and crosslinker addition on the properties of modified ethylene tar pitch (METP) were investigated, and the optimal reaction conditions were obtained by combining elemental analysis, FT?IR, XRD, Raman and thermogravimetric analysis on ETP and METP: The polymerization reaction temperature was 370 ℃, and the polymerization reaction time was 6 h, besides the addition of catalyst and crosslinker was 1.50%. The softening point (SP) of METP obtained under these conditions was 182 ℃, the coking value (CV) was 57.66%, the β resin was 42.26%, and the quinoline insoluble matter (QI) was 0.87%, which met the requirements of high carbon material precursors； The yieid of METP was 73.26%.

A novel preparation method of smart responsive glass sphere based composite carriers was reported in this study. Firstly, random block copolymers were synthesized by free radical polymerization of N⁃isopropylacrylamide, hydroxypropyl methacrylate and 3⁃trimethoxysilypropyl methacrylate. Then, the copolymer solution was uniformly sprayed on the surfaces of glass spheres by means of a self⁃made bottom spray fluidized bed reactor, and the bonding between copolymers and glass spheres was fabricated by thermal annealing, so as to form the copolymer/glass sphere composite carriers. The coating effects of the smart copolymers on the surfaces of glass spheres were investigated, including characteristic functional groups, surface microstructure, biocompatibility and thermosensibility. The results show that the temperature⁃responsive copolymers can be linked to the surfaces of glass spheres by bottom⁃spray coating technology, and the copolymer layers with certain thickness can be formed on the sphere surfaces. The composite carriers have good biocompatibility, and can realize effective cell adhesion and spontaneous desorption by using its intelligent response characteristics.

The Cu/Fe catalyst was prepared by displacement method and characterized by X⁃ray diffraction (XRD). The degradation effect of Orange II by persulfate (PS) catalyzed by Cu/Fe and its influence factors were investigated, and the mechanism of degradation was also investigated. The experimental results show that Cu/Fe can catalyze PS to degradate Orange II wastewater successfully, and its catalytic effect is better than that of zero⁃valent iron. When pH=3, the mass concentration of PS is 2.0 g/L, the quality of Cu/Fe catalyst at a concentration of 0.250 g/L, the degradation rate of Orange II is up to 99%. The t⁃butanol and methanol are used as radical scavengers to confirmed that the active radicals in the process of degradation are SO〖_4^-〗· and ·OH.

 

This research affords a new method to test the content of methanol in the gasoline, and a special portable instrument was developed according to this method. The disturbance caused by the existence of hydrocarbons and ethers in gasoline was excluded by extraction, and the alcohol was selective oxidized to aldehyde over catalyst A, and the presence of other alcohol can be neglected by selecting suitable color developing agent. The methanol content in 10 different kinds of gasoline samples (including samples of five Ethanol gasolines and of five unleaded gasoline) has been tested by this special instrument. According to the experimental data with GC and this method, the testing speed, selectivity and reliability of the method has been investigated, and the results shows that good reproducibility and accuracy of this method has been demonstrated as compared with those of other rapid test methods.

Under the preconditioned matrix P=I+R, the new USSOR iterative method was put forward. By the theory of matrix, it proved the convergence of the preconditioned USSOR iterative method when the coefficient matrix is a M-matrix or an H-matrix, gave a comparison theorem between the preconditioned USSOR iterative method and the classic USSOR iterative method when the coefficient matrix is a M-matrix, and disclosed precondition iterative method accelerates the convergence speed of the USSOR iterative method. Then a numerical example was used to demonstrate the validity.

 

To achieve the interaction of the P2P networks application with the Web Service, the method of introducing JXTAWSPROXY in JXTA P2P network was presented. Calling Web Service client-side codes were generated through AXIS, and the JxtaBiDiPipe was used to achieve two-way communication. The peer transparent calling to outside Web Service was achieve. The experiment results show that the method can complete the interaction with the JXTA and effectively achieve the calling to Web Servic

Let [WTHX]A[WTBZ]=([WTBX]aij)∈Cn×n, if there exists α∈(0,1) which can make |aii|≥Rαi(A)S1-αi(A)  be right for i∈N={1,2,…,n}, then [WTHX]A[WTBZ] is called an Ostrowski diagonally dominant matrix. We extended the concept to generalized Ostrowski diagonally dominant matrix，and obtained a new criteria conditions for a matrix to be a nonsingular [WTHX]H[WTBZ]-matrix. The theory of Ostrowski diagonally dominant matrix and nonsingular [WTHX]H[WTBZ]-matrix was improved and completed. These conclusions provide strong basis for the research of relative fields, such as computational mathematics, matrix theory, control theory, mathematical economics, etc.

According to several iteration methods for solving large linear system, when coefficient matrix is of α-diagonal strictly dominance, a new upper bound for the spectral radius of the iterative matrices was presented. Parameter estimation for JOR method was discussed. Results are applicable not only for α-diagonal strictly dominance, but also for generalized α-diagonal strictly dominant matrices. The known conclusion was improved. Finally, two numerical examples were given for illustrating advantage of results.