An improved ethylene glycol method was used to efficiently synthesize silver nanowires with a diameter of about 130 nm, a length of about 150 μm, and L/D was about 1 150 by adjusting the content of chloride ions, the amount of polyvinylpyrrolidone (PVP) and the reaction temperature. All raw materials are put in one time before the reaction, no need to use syringe pumps and other equipment to strictly control the content of components. The synthesized silver nanowires have high purity and few impurities. At the same time, it was purified by filtration and washed twice to obtain extremely pure silver nanowires, which is suitable for large?scale production. The conductive network of silver nanowires was constructed on the quartz glass substrate by spin coating. The results show that the light transmittance at 550 nm is 95.5%, the sheet resistance is 52.0 Ω/sq, and it have excellent photoelectric properties.

Biomass carbon aerogels with high specific surface area derived from sweet potato were prepared by freeze?drying and alkali activation processes. Sweet potato carbon aerogels (SPCA) and activated sweet potato carbon aerogels (ASPCA) with different morphologies and features were prepared by changing carbonization temperature and activation method. The prepared biomass carbon aerogels were characterized and analyzed by SEM, XRD, low temperature nitrogen absorption/desorption test and Raman spectroscopy. The results show that with the increasing of carbonization temperature, the pores increased, furthermore, alkali activation has a great promotion effect on the formation of pores on ASPCA. The prepared biomass carbon aerogel has good adsorption performance, and the maximum adsorption capacity for Rhodamine B (RdB), methyl orange (MO) and alizarin red (ARS) in deionized water is 202.2 mg/g, 83.6 mg/g and 160.2 mg/g, respectively.

High?nuclear silver clusters have recently received increasing attention owing to their interesting electronic structures and diverse geometric structures. According to Lewis acid?base theory and coordination chemistry theory, silver ions, as acidic centers that provide empty orbitals, often combine with organic ligands that carry lone pairs of electrons as basic centers to form stable coordination compounds. Alkynyl, thiol, and organic phosphine ligands have been widely used to coordinate with silver(I) ions to form silver clusters with various structures. This paper introduced the research progress of the silver chalcogenide clusters constructed by tert?butyl mercaptan ligand, as well as the synthesis methods and structures of silver chalcogenide clusters with different configurations, and explored its potential luminescence and electrochemical properties. The application prospects and development directions of silver chalcogenide clusters was prospected.

In this paper, used cheap, easy?to?obtain and multi?reactive 2?position single?side chain substituted 1,3?cyclohexanedione compound as a synthetic building block, used phenyl tetrafluoroborate diazonium salt as raw material, and adopt classic Japp?Klingemann fischer indole synthesis method, it is ring?opening fragmentation and following ring?closing to obtain more valuable multi?substituted indole structural units. Among them, 2?methyl?1,3?cyclohexidone and a diazonium salt of phenyl tetrafluoroborate were used as raw materials, under reflux conditions of p?toluenesulfonic acid as the acid reagent and toluene as the solvent, when the reaction was carried out for 15.0 h, the closed ring indole products were obtained with a yield of 49%; Meanwhile, 2?benzyl?1,3?cyclohexidone and a diazonium salt of phenyl tetrafluoroborate were used as raw materials, under the condition of heating and refluxing in a sealed tube of 30% hydrochloric acid ethanol solution, when the reaction was carried out for 0.5 h, the closed ring indole products were obtained with a yield of 98%. This methodology can be applied to the total synthesis of indole alkaloids.

As the greenhouse effect becomes gradually significant, CO₂ capture and storage (CCS) has turned into a potential emission reduction measure, and the adsorption method of CO₂ capture is one of the most promising technologies. Porous solid adsorbents have attracted widespread attention due to their excellent CO₂ adsorption performance. This review focused on the research of CO₂ removal by adsorption. Five different adsorption materials were introduced, and the main factors affecting CO₂ adsorption were summarized, as well as the adsorption performance of modified materials. The results show that the changes of temperature, pressure, and pore structure can affect the physical adsorption properties of the materials; reduction, oxidation, and metal ion loading modification can improve the CO₂ adsorption performance by Changing the type or number of functional groups on the surface of the material.

In recent years, with the continuous development of nanotechnology and oilfield development technology, nanomaterials have been widely used in water shutoff and profile control agents and have achieved varying degrees of development. This article reviews the research progress and latest achievements of nanomaterials in water shutoff and profile control from four aspects: foam, polymer gel, emulsion, and superfine cement slurry, and analyzes the use of nanomaterials in water shutoff and profile control agents. The mechanism of action and its influence on the law. It is found that after adding nanomaterials to the system, it can interact with the water shutoff profile control agent by its physical and chemical properties such as small size and large surface area so that the stability, strength, and strength of the water shutoff agent can be improved. The temperature and salt resistance is significantly improved, thereby effectively improving the water shutoff rate and oilfield recovery rate. In addition, from the perspective of water shutoff agent research and development, various problems in current research in this area are pointed out, to provide a reference for the research and application of nanomaterials in water shutoff profile control agents.

With the rapid development of human?computer interaction, electronic skin, wearable electronics and other emerging fields, flexible strain sensing materials as one of the core components have become the hot spot of the current research. The conductive polymer composites composed of conductive material and flexible polymer have the advantages of good flexibility, light weight, easy processing and forming, and the conductive property of the material changes under strain stimulus, so it can be used as flexible strain sensing material. This paper reviewed the classification and characteristics of flexible strain sensing materials based on conductive polymer composites, introduced the strain response mechanism of different sensing materials in detail, and summarized the factors that affect the strain sensing performance of conductive polymer composites.

The Enping formation of Y structure in block X in the east of the South China Sea develops a lake bottom fan deposit formed by the collapse of large sand rich braided river delta front sand body, which is vertically superimposed in multiple stages and has good superposition. The fluid properties in the block are complex and diverse, and there is a common phenomenon of gas production from oil reservoir and oil production from gas reservoir. The oil and gas layers have similar characteristics in logging data, which greatly increases the difficulty of fluid phase identification in the block, thereby providing certain difficulties to the comprehensive interpretation of logging. In view of the complexity of fluid properties in the study area and the difficulty of accurately identifying oil and gas reservoirs by using conventional gas logging anomaly multiple method, gas ratio method, three?dimensional and geochemical logging data, through the optimization of hydrocarbon component interpretation method based on gas logging, this paper came to the conclusion that Bar chart method and star chart method can quickly and effectively identify oil and gas reservoirs in this block. At the same time, the field application shows that the Bar chart and star chart fluid interpretation and evaluation method based on the difference of hydrocarbon component characteristics in gas measurement can quickly and accurately interpret and evaluate the complex fluid in block X reservoir. The results of interpretation and evaluation while drilling using this method are consistent with the results of testing, and the coincidence rate is more than 87%, which provides a reliable basis for the later reserve evaluation of the oilfield.

The geometric model of a certain oil and gas mixed transportation pipeline was established with OLGA software, and the transient flow law during the pipeline shutdown and restart process was studied. First, the distribution characteristics of temperature, pressure and liquid holdup along the pipeline during steady state operation were analyzed, and the location of the minimum temperature and the location of the maximum pressure along the pipeline were determined. The influence of environmental temperature and shutdown time on operating parameters were analyzed. The safe shutdown time when the minimum temperature temperature is higher than its freezing point was determined. In the actual operation process, the shutdown time should not exceed the safe shutdown time, otherwise problems such as pipeline condensation and excessive starting pressure will easily occur, which threaten the safety of the pipeline.

Pipeline transportation is the main means to transport oil and gas and other important materials, and the damage of buried pipelines by earthquake is difficult to repair. Based on the nonlinear dynamic theory, the ANSYS finite element software was used to establish the pipeline?soil model, and then the nonlinear contact model between pipeline and soil was established. Finally, different seismic waves were applied to the buried pipeline and compared. The results show that the upper and lower parts of the pipeline have large displacements under the influence of seismic waves; as the input seismic waves gradually increase, the displacement of the lower part of the pipeline decreases, but it is still greater than the displacement on both sides of the pipeline. It can be seen that the upper and lower parts of the pipeline will be greatly affected when an earthquake occurs.

In order to study the sealing performance of bolted flange connection system under high temperature condition, the thermal?structural coupling analysis of bolted flange connection system under 400.00 ℃ was carried out by Ansys?Workbench. The results show that the temperature decreases gradually from the inside of the flange wall to the outside, the maximum stress appears on the contact surface between the nut and flange, and the maximum strain appears on the gasket. Evaluated the sealing performance of gaskets at room temperature and 400.00 ℃; at the same time, aiming at the easy sealing failure of gaskets in the connection system under high temperature, established gasket strength failure of bayesian networks, based on a series of methods such as expert evaluation to calculate the prior probability, used Bayesian network reverse reasoning to calculate the posterior probability of the root node and sort them to find out the main factors leading to the invalid gasket, so as to enhance the reliability in the process of using gasket.

The 4WS rotor is a new type of internal mixer rotor, and the ratio of long and short edge length is one of the important geometrical structure design parameters. The flow fields in 4WS rotor internal mixer with ratio of long and short edge length, 2∶1, 3∶1 and 4∶1, were simulated by using the software POLYFLOW. Through particle tracing technology, the macroscopic mixing state of the three internal mixers was visualized and tracked.Using the flow field data, the typical evaluation parameters of dispersive mixing and distributed mixing were calculated, and the mixing efficiency of the fluids in three different rotor internal mixers was compared and analyzed, and the effect of ratio of long and short edge length on mixing characteristics of 4WS rotor mixer was explored. The results show that, compared with the 4WS rotor internal mixer with a length ratio of 3∶1 and 2∶1, the dispersing and distributed mixing ability of 4∶1 type rotor have been greatly improved.

In order to solve the problem of strong subjectivity of the prior data of the dynamic Bayesian network (DBN) obtained when analyzing the reliability of the system, BP neural network was used to optimize the prior data of DBN, taking the burner system of gasifier as the research object. According to the empirical formula of the number of neurons in the hidden layer, the DBN of the gasifier burner system was divided into three subsystems, which were transformed into BP neural network respectively, and the estimated prior distribution of DBN was corresponding to the input function and output function of the BP neural network respectively, the performance of the system is studied and the DBN parameters are optimized by using the characteristics of information is transmitted forward and error backward of BP neural network. The two?way reasoning of the gasifier burner system DBN is carried out to realize the dynamic reliability analysis of the gasifier burner system. The results show that the forward reasoning of the gasifier burner system DBN can obtain the optimized system reliability trend; the reverse reasoning is performed to obtain that the results of key events and weak links remain the same before or after optimization and the weak links are the high value and fluctuation of oxygen coal ratio.

Mergers and acquisitions is an effective way to rapidly expand the scale of enterprises and achieve profit growth. This article selected the M&A events of China's media industry listed companies from 2016 to 2017 as a sample, and conducted an empirical analysis on the relationship between CEO tenure, internal control, and media industry M&A performance. The results show that the M&A performance of the media industry has a tendency to rise first and then decline after the M&A; CEO tenure is negatively correlated with the M&A performance of the media industry; under the premise that other conditions remain unchanged, the effectiveness of media industry corporate internal control will promote the improvement of M&A performance; perfect internal control can weaken the negative correlation between CEO tenure and M&A performance in media industry. Based on the above research conclusions, some suggestions were put forward to improve the M&A performance of enterprises in the media industry.

In recent years, the sales volume of the automobile industry, which is the backbone of the national economy, has been declining, and the financial leverage ratio has continued to rise. In order to improve the profitability of automobile manufacturing enterprises, this paper used SPSS 26.0 and Excel 2010, collected the financial data of 145 auto A?share listed companies in Shanghai and Shenzhen from 2017 to 2019 as samples to conduct an empirical analysis and test of the relationship between corporate leverage ratio, corporate growth ability and profitability. The results show that there is a negative correlation between leverage ratio and profitability, positive correlation between corporate growth ability and profitability, negative correlation between corporate leverage ratio and growth ability, and there is a certain intermediary effect in the influence of corporate growth ability on profitability.