By using methyl methacrylate (MMA) as the harder monomer, butyl acrylate (BA) as the softer monomer, acrylic acid (AA) as the functional monomer, acetoacetoxyethyl methacrylate (AAEM) as the crosslinking monomer, tert⁃butyl peroxybenzoate as the initiator, propylene glycol butyl ether as the solvent for prepared self⁃crosslinking acrylate emulsion by free radical solution polymerization and phase inversion, and the emulsion could be self⁃crosslinked after baking at high temperature without additional crosslinking agent. This article mainly studied the influence of acrylic acid, acetoacetoxyethyl methacrylate and curing time on the performance of the polyacrylic resin dispersion and the film property. The results show that the optimized formula is as follows: The dosage of AA and AAEM are 3.5% and 5.0% of the total monomer mass, respectively, and the baking time is 1.0 h at a curing temperature of 180 ℃. FT⁃IR and GPC analysis showed that AAEM was successfully attached to the molecular chain of acrylic resin; SEM and particle size analyzer analysis showed that the TG of the film is latex particles were spherical and uniformly distributed; DSC analysis showed that after the synthesized resin dispersion is significantly increased after the synthesized resin dispersion is baked at high temperature for a period of time.

In order to improve the methane storage in porous media under mild conditions, the storage characteristics of methane in Mil⁃101 (Cr) were studied based on adsorption water method.MIL⁃101 (Cr) was prepared and characterized. Methane adsorption experiments were performed at 271.15 K and 0～7.0 MPa with different water contents. The particle size of the synthesized material was uniform, grain size range was 100～150 nm, and almost without impurities. The pore size was mainly distributed in the range of 1.7 nm to 3.6 nm. The results of adsorption experiments show that: MIL⁃101 (Cr) adsorbs more methane under the condition of water, and with the increase of the water content, the amount of methane adsorption increases. The pressure required for nucleation in porous media is higher than that for bulk system, and the greater the water content is, the higher the critical pressure is. The MOF material used in the experiment still has good adsorption capacity after repeated regeneration. The research results have certain significance for increasing the natural gas storage capacity.

With the rapid development of industry, the negative impact of the use of fossil fuels on the ecological environment is becoming more and more prominent. Among them, CO2, as the main greenhouse gas, causes serious harm to global climate change. The selective hydrogenation of CO2 to methanol is one of the important ways to solve the greenhouse effect, develop green energy and realize sustainable economic development. Copper⁃based catalysts are widely employed for CO2 hydrogenation to methanol due to their excellent catalytic performance and low cost. The difference in reaction mechanism is due to the highly adjustable chemical and electronic properties of copper⁃based catalysts, resulting in the different catalytic performance. This article reviewed the representative reaction mechanism of selective hydrogenation of CO2 to methanol over copper⁃based catalysts was presented, aiming to provided a theoretical guidance for the design of efficient and stable copper⁃based catalysts.

The application of M⁃MOF⁃74 series in CO ₂ removal of natural gas was studied. The skeleton model of M⁃MOF⁃74 was established. The adsorption of pure CO ₂ gas and CO ₂/CH ₄ mixed gas in M⁃MOF⁃74 series adsorbent was calculated by GCMC method. The results showed that the order of adsorption of CO ₂ by M⁃MOF⁃74 adsorbent was Mg⁃MOF⁃74 > Ni⁃MOF⁃74 > Co⁃MOF⁃74 > Fe⁃MOF⁃74 > Cr⁃MOF⁃74 > Mn⁃MOF⁃74.When adsorbing mixed gases, the adsorption amount of CO ₂ by each adsorbent is consistent with that of pure CO2 adsorption, and the adsorption amount of CH ₄ is: Mg⁃MOF⁃74>Ni⁃MOF⁃74≈Co⁃MOF⁃74≈Fe⁃MOF⁃74≈Cr⁃MOF⁃74≈Mn⁃MOF⁃74. The law of isosteric heat of gas on M⁃MOF⁃74 is the same as that of adsorption capacity, indicating that the interaction between gas and M⁃MOF⁃74 is the main factor affecting the adsorption amount. The selectivity of each adsorbent to mixed gas: Ni⁃MOF⁃74>Co⁃MOF⁃74>Fe⁃MOF⁃74>Mn⁃MOF⁃74>Cr⁃MOF⁃74>Mg⁃MOF⁃74. Comprehensive comparison of CO ₂ adsorption capacity, regeneration energy consumption, selectivity coefficient and other parameters, Ni⁃MOF⁃74 is more suitable for the adsorption and separation of CO ₂ in natural gas.

Photocatalytic technology can convert solar energy into chemical energy under mild reaction conditions and promote the degradation of organic pollutants. As a new type of non⁃metal semiconducting polymer, graphite phase carbonitride has unique electronic structure and good chemical stability. In recent years, it has received extensive attention in the field of photocatalysis, but graphite phase carbonitride itself has some shortcomings. However, graphite⁃phase carbon nitride itself has some shortcomings, for example, the forbidden band width is 2.7 eV, which can absorb only blue⁃violet light of less than 475 nm in sunlight, photo⁃generated carriers are easy to recombine, quantum efficiency is low, and specific surface area is small, which needs to be modified to improve photocatalytic performance. In this paper, the research progress of graphite⁃phase carbon nitride in structure optimization, precious metal deposition, semiconductor composite, element doping, dye sensitization, carbon composite and its application prospect in the field of environmental pollution purification are reviewed.

This paper is concerned with the synchronous  H _∞ switching control problem for a class of discretetime delay switched systems with time-varying delay under partially delay-dependent controller. Using the multiple Lyapunov function and the average dwell time method, the conditions for the average dwell time are satisfied. Under this switching condition, the system is mean square exponent stable and has weighted  H _∞ performance. At the same time, the design of the  H _∞ switching controller is given. Finally, a numerical example is used to illustrate the effectiveness of the proposed design method.

The channel prediction of Fuyu reservoir has been always highly emphasized. Using the conventional seismic attribute to predict channel is difficult to achieve the precision requirements because of the complex fault and the fast lithofacies phase in Fuyu reservoir. Aiming at this weak problem, the method of combing gray correlation analysis and support vector machines is used to establish a set of technical process which is suitable for the prediction of fluvial reservoirs under complicated geological conditions. In Fuyu test area in X reservoir of Daqing oilfield as an example, firstly, conventional seismic attribute of sedimentary unit dimensionless, obtained by the method of gray correlation analysis of the seismic attribute correlation factor, the greater the degree of correlation, indicating that the response probability of attribute river is higher. On this basis, the optimal correlation factor sequence a accumulation of large properties, first order accumulative sequence is generated, used as the input into the support vector machine training sample, so as to complete construction of support vector machine river forecast model. Drilling confirms that the prediction based on Gray Correlation Support Vector Machine has a larger coincidence rate of drilling. Combined with the superiority of seismic inversion to predict the channel sand boundary, supplemented by data of core, well logging and mud logging data to complete sedimentary microfacies in X Test Area Fuyu reservoir. Meanwhile, drilling further confirms the reliability of predicting channel and then the industrial oil flow well is successfully obtained. The results of comprehensive research show that this method is suitable for high channel prediction accuracy. It can be used as a better channel prediction method under complicated geological conditions.

Fuzzy C-means clustering algorithm is sensitive to initial clustering center and membership matrix and likely converges into the local minimum, so it can not get the best clustering results. A new image segmentation algorithm based on chaos particle swarm and FCM clustering is proposed. The uniform particles are produced by logical self-map function.When it gets into the premature convergence,the algorithm can start the chaos optimization to improve the performance of convergence into the local minimum because of standstill. The experimental results show that the new algorithm has faster convergence and higher accuracy of segmentation.

For low flow waxy crude oil pipeline, certain wax thickness retained after wax removal was beneficial to the economic operation of the pipeline for the wax insulation. From the perspective of security, however, certain wax thickness retained was at risk. With certain wax thickness reserved, diameter became smaller. Once the pipeline stopped or output declined, the heat carried by the unit volume of crude oil in the pipeline reduced, and cooling rate accelerated, the formation of the gel structure speeded up. The permitted stoppingtime of pipeline was greatly reduced. The smaller diameter of pipeline was, the more difficult for the pipeline restarted after shutdown . Meanwhile, after shutdown, paraffin deposits destructively slipped in the pipeline lying areas at certain special locations especially acclivities of tube sections, causing the wax plugging. Pigging regularly and thoroughly was recommended.

 

 

By use of searching technique of ant colony algorithm, a rough set attribute reduction method based on ACA was proposed. The core was joined in initial pheromone in order to accelerate convergence. Dynamically adjusting the strategy of selection of the paths and the strategy of the trail information updating based on the distribution of the solutions, the algorithm can advance global capability. Experimental results show that the algorithm is effective, and has better convergence speed and stability.

An improved multiple ant colony algorithm was presented which aims at load balance and optimization of network resources management. Through the interaction and dynamic update among the pheromone of multiple ant colony which are on behalf of the network traffic, the algorithm enabled network traffic to share a number of paths available; Through the combination of orientable choice and stochastic choice to select best path self-adaptively, the algorithm achieved the traffic load balancing; Through setting the maximum-minimum pheromone to avoid premature convergence, the algorithm increased capabilities of global optimum search; Through the improvement of the cost function and the comprehensive use of a variety of improved ways, the algorithm improved self-adaption of the algorithm. The results of simulation experiment demonstrate that compared with multiple ant colony load balance algorithm，improved multiple ant colony algorithm has superiority in reducing time of auto adaption, lowering packet loss rate and improving efficiency of load balance.

The composing parts based on geography position, and some typical Ad Hoc network router agreements based on the move of geography position were introduced. On the basis of one router agreement, one kind of new strategy of package transmission was put forward, and the problem of losing package when package is transmitted was solved. So it improves the agreement's stability, security and haleness.

Because of small kernel, high efficiency and openning codes, Linux operating system have been more and more used in embedded development. In this article the process of Linux porting was analyzed, including the establishment of compiling environment, changes and porting bootloader codes, and kernel's porting. A method of Linux porting was given. At last, it took a practice on S3C2410 based on ARM, which proved its feasibility. 

The characteristics of implementation data exchange were discussed based on Web Services technology among heterogeneous environment. The application of publish/subscribe technology changed the way users find Web Services. The publish/subscribe mechanism was focused on, and recommended find Web Services model was given. Combined with concrete examples, the feasibility of the design model was verified. The target system has a good application prospect.

To deal with the prematurity and low convergence speed when the genetic algorithm is used for global optimization, a rough set attribute reduction algorithm based on adaptive GA was proposed. Based on the adaptive crossover operator and mutation operator that adjust the crossover probability and mutation probability of each individual, the selection probability of every individual of the population was optimized in this algorithm. Experimental results show that the algorithm can evidently improve global optimization capability and convergence speed.

The test piece which was made from metal material such as 16MnR, Q235 and 20g was processed using anti-welding-heating treatment. The stress and fatigue was tested for the processed piece. Through the data analysis, it was obtained that anti-welding-heating treatment is a kind of effective technology about adjusting the welding residual stress, which can decrease the welding residual tensile stress of the metal material. If the difference in temperature is big enough, a bidirectional compress residual stress layer will be formed on the processed metals surface, which can improve fatigue resistance ability of metal material.

It was introduced that the influence and mechanics of anti-welding procedure on corrosion resistance of the different materials such as Q235 steel,16MnR steel and 20g steel in the acidic and alkali solutions. This method is to carry on the heat treatment for each kind of material sample, and use the cooling medium to cool the welding joint rapidly, in order to obtain the negative temperature departure that is opposite to the welding temperature field，and relieve the residual stresses produced in the welding process. Q235 steel and 16MnR steel which are processed by 350℃ anti-welding procedure, compared with the unprocessed samples, the corrosion rate in the acidic solution reduces 66.1％and 67.9% respectively. The results show that the anti-welding procedure relieves effectively the welding line residual stresses and slows up the stress corrosion rate. This method can be applied to the welding structures which are required to prevent the stress corrosion.