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Sodium-ion batteries, with the advantages of low cost and abundant resources, have become an effective complement to lithium-ion batteries in application scenarios such as large-scale energy storage systems and short-distance electric vehicles. Nevertheless, sodium-ion batteries generally lag behind lithium-ion batteries in energy density. The aim of this paper is to provide an overview of current research results on anode and cathode materials and to provide insights into the challenges faced by various materials, such as the deficiencies of hard carbon materials for the anode in terms of sodium storage capacity and stability at the solid electrolyte interface (SEI), and the poor air stability and susceptibility to phase transitions of layered oxides for the cathode. Further, the report proposes several innovative solutions with the goal of developing better sodium ion electrode materials. These strategies include, but are not limited to: improving the microstructure of hard carbon through nano-engineering techniques to enhance its sodium storage capacity; and employing surface coating or doping methods to improve the air stability of cathode materials. Through these research endeavors, this paper expect to provide a solid scientific foundation and new perspectives for the advancement and application expansion of sodium-ion battery technology.

The establishment of The Walt Disney Company can be traced back to the year 1923, when two brothers, Walt and Roy O. Disney, founded a small animation studio that has further developed into a global media organization through strategic innovation, diversification, and expansion. The paper analyses the business development of Disney by looking into its historical background, diversification policies, globalization, digital transformation, and its social and environmental responsibilities. Through the acquisition of big studios like Pixar, Marvel, and Lucasfilm as well as the launch of Disney+ streaming service Disney has furthered the diversity of the entertainment offering as well as kept up with the needs of the digital age. The international theme parks and media networks owned by the company show their global influence and ability to adapt the local context through portraying different cultures. Disney`s way of dealing with the sustainability and social responsibility is a solid proof of its environmental protection and community contributing. The COVID-19 pandemic, among other challenges, did not obstruct Disney’s goal-oriented orientation and resourcefulness in achieving the desired outcomes. Thus, this study underlines the everlasting impact of Disney and its innovative approach for further development in a very dynamical sector of the entertainment industry.

With the increasing number of submarine cable projects, the terrain and geological conditions of the landing section are becoming increasingly complex, and the traditional implementation of trench burial is becoming increasingly difficult. A landing construction plan for large-section power cables suitable for steep terrain and rugged rock formations is studied and proposed based on sorting out existing submarine cable landing plans. Using directional drilling construction machinery ideal for rock formations, natural cable protection pipes are formed in rock formations after dragging and expanding the holes, meeting submarine cable protection’s safety and economic requirements. In the climbing section of the submarine cable from the seabed to the rock hole, measures such as bottom sandbag raising and top rock throwing security are adopted to avoid vortex-induced vibration and erosion caused by the cable hanging in the climbing section. The construction plan of the directional drilling passage through hard rock and the construction and protection plan of the submarine cable do not affect the current situation of the existing coastal reefs and can effectively protect the submarine cable from external damage, achieving green and environmentally friendly construction.

With the booming freight industry in China in recent years, the freight volume has presented a growing trend, but the accompanied motor vehicle pollution emission becomes increasingly prominent. For the purpose of green development in freight industry, China is taking active measures to reduce emissions. Among them, the structural emission reduction enjoys the greatest potential in energy conservation and emission reduction in the transportation industry in the future. Its key is to adjust the current unreasonable transportation structure in China, and promote the transfer of freight transport from road to rail and water through the development of multimodal transport. Therefore, systematically finding out the structural characteristics of China’s freight industry and sorting out the problems existing in the freight structure can provide technical support for promoting the structural emission reduction of the freight industry and building an intensive, efficient and green cargo transportation system. This study systematically analyzed the overall development and structural characteristics of China’s freight transportation, calculated the current situation and characteristics of CO2 emissions in China’s freight transportation sector, summarized and analyzed the main problems facing energy conservation and emission reduction in China’s freight transportation sector, and put forward countermeasures and suggestions.

In a prefabricated composite pipe gallery with socket joints, the repeated loading and unloading effect of shield construction on the overlying soil and the existing pipe gallery may cause considerable deformations to the pipe gallery at the joint while ensuring its own bearing capacity. The shield tunnelling underneath the existing pipe gallery project of the Fuzhou Metro was used as a basis to model the socket pipe gallery on ABAQUS finite element software. The influence of changes in the pipe-tunnel spacing on the deformation and displacement of the pipe gallery and stratum were investigated. It was found that when the shield passes through the pipe gallery with 0.25 times the tunnel diameter, in addition to the settlement area of the disturbance centre, uplift areas are created on both sides of the pipe gallery and the surface. Meanwhile, because of the socket structure of the pipe gallery, the vertical displacement of the pipe gallery is not synchronized with the settlement of the lower soil. Furthermore, with the increase in the pipe-tunnel spacing, the settlement trough of the vertical displacement curve of the pipe gallery and the stratum are gradually broadened, and the peak settlement gradually increases.

The introduction of high-speed railway has significantly enhanced transportation services for cities along its route, offering greater convenience to passengers and commuters. Through analysis of passenger flow data and economic data from cities along the high-speed railway line, we find the apparent siphon effect caused by the introduction of high-speed railway on larger cities. However, for medium and small cities, high-speed railway further weakens their attractiveness, leading to capital and labour outflow. This article provides an analysis of the impact of high-speed railway on cities along its route, utilizing passenger big data and investment data. It also offers recommendations for small and medium-sized cities to optimize their tourism resources and develop unique industries, aiming to mitigate the economic risks associated with the introduction of high-speed railway.

In the process of excavation of underground tunnels, water gushing is often accompanied. In order to avoid affecting the construction schedule and safety, it is necessary to accurately evaluate the drainage capacity. In this paper, the drainage capacity of the tunnel is reviewed and calculated, and the effects of longitudinal slope, steel arch and roughness are considered. The drainage capacity under different conditions is analyzed by the formula of uniform flow in open channel.

This comparative study delves into the foreign labor policies of Malaysia and Singapore, two prominent host countries for foreign workers in Southeast Asia. Despite their historical, cultural, and developmental similarities, these nations exhibit variations in the efficiency of their foreign labor policies. Employing the Most Similar System Design (MSSD) approach, this research explores three key explanatory variables: economic factors related to industrial structures, differences in governance systems, and cultural backgrounds. The study finds that these factors significantly shape the formulation and effectiveness of foreign labor policies. The analysis reveals that Singapore outperforms Malaysia in leveraging foreign worker policies to drive economic transformation, enhance competitiveness, and manage the impact of foreign labor. Factors contributing to this discrepancy include the divergence in industrial structures, variations in governance systems, and the influence of cultural backgrounds. Singapore's unitary system, focus on high-skilled foreign workers, and non-racial political landscape contribute to its policy efficiency, while Malaysia's federal structure, lowerskilled labor demand, and communal politics impact its policy effectiveness.

Buildings are, collectively, a high-energy-consuming sector, accounting for as much as 50.9% of total carbon emissions. With the introduction of carbon peaks and neutrality as carbon reduction strategies, carbon emissions reduction has become a research hotspot in the construction industry. Most of the current research focuses on residential and public buildings; the carbon footprint of industrial buildings has been less explored. In this study, we focused on a subset of industrial buildings, the energy substations in Xiamen, China. The carbon intensity of the three stages of material production, transportation, and operation is calcu-lated. The results of the study show that the three stages of whole-life cycle carbon emissions are 1,612,889.25, 51,038.9 and 17,034,352.5 kgCO2e, and the percent are 8.63%, 0.27% and 91.10%, respectively.

This paper combines the theory of resource-constrained project scheduling to analyze the cost influencing factors during the installation phase of prefabricated buildings, and establishes a resource-constrained scheduling model with the goal of minimizing the installation time to achieve the optimization of time cost during the installation phase.

The oilfield has entered the ultra-high water cut period, the distribution of remaining oil is scattered, and it is difficult to tap the potential. On the plane, affected by sand body distribution and well pattern production objects, sand body perforation does not correspond to each other, forming residual oil with imperfect injection production relationship; The residual oil formed in the retention area at the edge of the fault due to the influence of fault shielding. Vertically, affected by the heterogeneity, interlayer and rhythm in the layer, the bottom of the thick oil layer is strongly washed, the middle is moderately strongly washed, and the top is weak and not washed. The production difference is large, and the remaining oil mainly exists at the top of the oil layer. The remaining oil with imperfect injection production relationship and special parts is tapped through ultra short radius horizontal wells to improve oilfield development efficiency.

In today’s fiercely competitive business landscape, enterprises strive to enhance their competitive advantage. One crucial aspect of achieving this is by optimizing their supply chain practices. This paper presents a comprehensive analysis of Jing Dong (JD), a prominent e-commerce company, as a case study to delve into its supply chain technologies. By examining the specific technologies implemented by JD and elucidating their positive impact on the company’s performance, this study establishes a robust theoretical foundation for further research. It offers a practical model for companies seeking to improve their supply chain practices. By adopting and adapting similar technologies and strategies, enterprises can unlock new opportunities, streamline operations, and ultimately gain a sustainable competitive edge in their respective industries. Through a deeper understanding of JD’s successful supply chain approaches, companies can strategically enhance their capabilities and thrive in the dynamic market environment.

Monitoring large gradient ground deformation due to temporal and spatial image decoherence has long been a challenge. We attempted an improvement using Sentinel-1A and Sentinel-1B C-band data fusion methods based on the variation law of subsidence velocity of ground leveling monitoring points. This approach improved the temporal resolution from 12 to 6 days. Using a mine in Datong, Shanxi Province, China as an example, 13 scenes of Sentinel-1A data and 12 scenes of Sentinel-1B data were fused and compared with ground-measured data. The results obtained were closer to the measured values than those obtained by single data set (Sentinel-1A or -1B only). Simultaneously, 61 scenes of Sentinel-1A data and 12 scenes of Sentinel-1B data were used to calculate the subsidence of the mining area over two years. The subsidence map was consistent with the actual leveling trend, which reflected the dynamic change of surface subsidence range in the mining area. This study provides an approach using DInSAR technology to monitor large gradient deformation in mining areas and provides an effective method to monitor of surface dynamic deformation.

El presente artículo está dedicado a estudiar la percepción y la realización del enlace fonético del español por los estudiantes sinohablantes. Para ello, se realiza un estudio contrastivo sobre este fenómeno entre español y chino, con el fin de comparar los rasgos fónicos relacionados con el enlace en ambas lenguas. Asimismo, se lleva a cabo un experimento relativo, compuesto por una prueba de dictado y una prueba de lectura en voz alta, con 40 estudiantes sinohablantes del nivel B2 y C1 que aprendieron o aprenden español en universidades chinas. A través del análisis estadístico de los errores relativos al enlace cometidos en el dictado y los enlaces realizados en la lectura en voz alta, se propone explorar la posible influencia del enlace en la discriminación léxica, la posible pronunciación del español con resilabación de los segmentos consonánticos y vocálicos que están en posiciones inicial y final de dos palabras sucesivas por estudiantes de este perfil, así como la relación entre la percepción y la realización del enlace.

In the urban delivery sector, expanding the use of new energy vehicles (NEVs) can have a considerable positive impact on low-carbon sustainable development. To promote the application of newenergy vehicle in logistics industry, China’s Ministry of Transport launched Green Urban Freight Pilot Program in 2017 and has been achieved with promising results. However, the program has also encountered various restrictions and obstacles. This study carried out local investigations in six pilot cities of the Green Urban Freight Pilot Program. Key challenges of new energy logistics vehicles (NELV) adoption such as insignificant road access privileges, low cost-effectiveness, insufficient charging facilities, etc., were further identified through field research, online interviews and panel discussions. Then, detailed policy suggestions and recommendations targeting to national level and local level are proposed to promoting NELVs development.

As global focus sharpens on carbon emissions and environmental protection; the pursuit of sustainable development permeates every sector. Against the backdrop of increasing fossil fuel prices and relentless energy demand, the exploration of clean energy has become paramount. This paper presents a comprehensive review of bioenergy. It introduces the concept and underscores its importance, tracing the historical stages and accomplishments in its development. The paper explicates different types of bioenergy and their chemical operating principles. The integral system of bioenergy is also evaluated, focusing on crucial components: bioenergy feedstocks, processing technologies, transport process, storage, and grid integration. The paper concludes with an assessment of bioenergy's economic and environmental impacts, considering market dynamics and future prospects, and suggests potential mitigation measures against its environmental repercussions.

The purpose of this study is to provide sustainable growth strategies and practical methods to realize the sustainable development of International Chinese language education along the Belt and Road Countries in the Post-Epidemic era. This article consists of a SWOT (Strength, Weakness, Opportunity, Threat) analysis of developing International Chinese language education in Belt and Road Countries. and in-depth interviews with experts in International Chinese language education in China. The Analytic Hierarchy Process (AHP) is adopted to the finalized and quantified SWOT matrix to incorporate experts’ ideas.The result showed that the total strength and total opportunity of International Chinese language education in Belt and Road Countries are much greater than that of total weakness and total threat, which indicates that the opportunities outweigh threats, and advantage outweigh disadvantage. Therefore, the growth-oriented strategy shall be applied to spur the sustainable development of Belt and Road Countries’ International Chinese language education. In addition, the setbacks should also be taken into serious consideration in order to overcome the weakness and the threat.

Lignin peroxidase can degrade lignin in a relatively high efficiency, the highly efficient application of lignin peroxidase for environmental prevention and governance was promoted by exploring the effects of small molecule substances on lignin peroxidase activities. In this study, the lignin peroxidase (LiP) gene from Irpex Lacteus was heterologous expressed in Escherichia coli. The activity of the recombinant LiP was 11.2 U/mg, the optimum temperature was 37℃, and the optimum pH was 3.5. In the range of 20-45℃ and pH 2.0-4.0, the relative enzyme activity remained above 50%, showing good acid resistance, Zn2+, malonic acid, glycerol and other substances can promote the activity of LiP enzyme, among which Zn2+ can increase the activity of LiP enzyme to 256%, and when the glycerol supplemental level is 3%, the activity of LiP enzyme can increase to 186%. This study for the first time verified the promoting effect of glycerol on LiP enzyme activity, serving as a reference for LiP in studies on lignin breakdown and paper wastewater treatment.

During the aluminum electrolysis process aluminum is produced at the cathode and CO2 gas bubbles are generated on the anode and released. The bubbles reduce the active surface area of the anode, which increases energy consumption. They also cause the liquid aluminum to fluctuate and oxidize again. The study of anodic bubble behavior is important to reduce power consumption and improve current efficiency. In this paper, the phase field, laminar flow and tertiary current distribution modules in COMSOL Multiphysics are applied to simulate the growth and motion patterns of anodic bubble in the electrolytic cell to visualize and analyze the behavior of anode bubble.

This paper characterizes nanoscale soil-water retention mechanism of unsaturated clay through molecular dynamics simulation. Series of molecular dynamics simulations of clay at low degrees of saturation were conducted. Soil water was represented by a point cloud through the centre-of-massmethod. Water-air interface area was measured numerically by the alpha shape method. Spatial variation of water number density is characterized and used to determine the adsorbed water layer. The soil-water retention mechanism at the nanoscale was analysed by distinguishing adsorptive pressure and capillary pressure at different mass water contents and considering apparent interface area (water-air interface area per unit water volume).

Hydraulic fracturing is an effective technology used to stimulate hydrocarbon production from unconventional reservoirs. Numerical simulation of the hydraulic fracturing process plays a key role in the design of hydraulic fracturing. However, most of existing models are overly simplified by neglecting the poroelasticity of rock matrix, which may have a substantial effect on the growth of hydraulic fractures, especially in oil and/or water saturated formations. In this study, we developed a fully coupled finite element model for hydraulic fracture propagation in permeable formations by combining XFEM technique with cohesive zone model, and used it to investigate the effects of poroelasticity on the geometry evolution of single fracture which initiated from an injection point. Fluid flow within the fractures, Darcy flow within the rock matrix, hydraulic fractures propagation, and fluid leak-off into the formation are simultaneously taking into account in the model. Then, the model is validated by comparing the results with available analytical solutions. To understand and quantify the poroelastic effects on the propagation of hydraulic fracture, several cases with different matrix permeability, leak-off coefficients, and bulk modulus of pore fluid are performed. The simulation results show that the total volume of leakage is controlled by the combined action of matrix permeability and leak-off coefficient. The fracture aperture and length decrease with the increase of matrix permeability or leak-off coefficient, while as the bulk moduli of pore fluid increases, the fracture aperture and length tend to increase.

The initial distribution of gas and liquid is one of the key factors that determine the operation efficiency of packed towers. The development of a gas distributor for ultra-large air blow-out bromine extraction plant can improve operation efficiency, save energy and reduce consumption. In order to develop the gas distributor for ultra-large air blow-out bromine extraction plant, the guidelines for evaluating gas distributors are clarified in this paper, and six kinds of commonly gas distributor are compared in detail. Considering gas distribution inhomogeneity, liquid foam entrainment rates and distributor pressure drop, the double tangential circulation type gas distributor is the first choice in the ultra-large air blow-out method bromine extraction plant.

Medical ethics is a quality that should be possessed by healthcare workers. There is an urgent need for the development of medical and health services, which carries the people’s aspiration for a better life. We should vigorously promote the construction of medical ethics, in which the author believes that “nourishing” is the cornerstone and “guidance” is the core. In this paper, we discuss the construction of medical ethics from the two dimensions of how medical and health institutions can make good use of “nourishing” and “guidance,” and put forward corresponding countermeasures from the current status quo of medical ethics. Our aim is to develop and strengthen the medical and health service team in terms of quality, quantity, ability, and moral integrity, thereby promoting the construction of the Healthy China Initiatives.

The concept of low-carbon green development has become a global consensus, and the servitization of manufacturing is a feasible path to achieving green development in manufacturing. This paper takes manufacturing enterprises in 27 provinces and cities in China from 2006 to 2019 as samples, and empirically analyzes the effects of manufacturing servitization to promote carbon emission reduction in a low-carbon economy, which shows that: manufacturing servitization can reduce carbon emissions, and informatization, urbanization and energy structure optimization promote carbon emission reduction; in the less developed and backward central and western regions of the economy, manufacturing servitization promotes carbon emission reduction The effect is obvious. In the future, China should give full play to the digital economy's new advantages, optimize the manufacturing industry's energy use structure, and take the lead in promoting the servitization of the manufacturing industry in less economically developed regions.

The modern society has been developing rapidly, and the Internet has become one of the most revolutionary development throughout the eras. Nowadays, people’s high reliance on the Internet inevitably leads to the development of diverse online products, one of which is the occurrence of the short video applications. A typical representation of a successfully runned short video platform is Douyin, which is the research objective of this paper. This research aims to investigate the strategic mechanisms utilized in the platform Douyin, in terms of both psychological and commercial aspects. This paper focuses specifically on how the use of strategies forms a habit-forming technological product which causes individual’s high addiction. To conclude, the hook model and recommendation algorithms can be the main mechanisms that cause user addiction to Douyin platform.

Abstract Base editing has the potential to improve important economic traits in agriculture and can precisely convert single nucleotides in DNA or RNA sequences into minimal double-strand DNA breaks (DSB). Adenine base editors (ABE) have recently emerged as a base editing tool for the conversion of targeted A:T to G:C, but have not yet been used in sheep. ABEmax is one of the latest versions of ABE, which consists of a catalytically-impaired nuclease and a laboratory-evolved DNA-adenosine deaminase. The Booroola fecundity (FecB B ) mutation (g.A746G, p.Q249R) in the bone morphogenetic protein receptor 1B (BMPR1B) gene influences fecundity in many sheep breeds. In this study, by using ABEmax we successfully obtained lambs with defined point mutations that result in an amino acid substitution (p.Gln249Arg). The efficiency of the defined point mutations was 75% in newborn lambs, since six lambs were heterozygous at the FecB B mutation site (g.A746G, p.Q249R), and two lambs were wild-type. We did not detect off-target mutations in the eight edited lambs. Here, we report the validation of the first gene-edited sheep generated by ABE and highlight its potential to improve economically important traits in livestock.

By considering the symbiosis between rest behavior with charging behavior during intercity traveling, the inconvenience of battery electric vehicles (BEVs) confined by the battery capacity can be relieved. This paper proposed a quantitative analysis method for revealing this phenomenon from an accessibility perspective. This proposed method involved a calculation model of intercity travel time for electric vehicle by considering the current configuration of electric vehicle charging facilities and energy consumption with travel speed. Based on the highway network and charging pile network in Beijing-Tianjin-Hebei region, a case study has been analyzed to verify the feasibility of the model. The results show that the accessibility performance of BEVs and fuel vehicles is close in Beijing Tianjin Hebei region, which has relatively perfect charging facilities. And by joint the charging behavior and rest behavior, there is almost no difference between BEV models with a large range and advanced charging technology and fuel vehicles in intercity travel. In addition, the charging facilities along the expressway in the region can basically satisfy the experience of intercity travel for BEVs, and further increasing the number of charging stations cannot significantly improve the accessibility of electric vehicles.

After long-term water flooding development in old oilfields, oil layers are generally flooded. Accurate and rapid recognize the water flooding layer is the key to later infill well layout and development plan adjustment. In this paper, taking Xingbei area of Daqing Oilfield as an example, on the basis of clarifying the characteristics of the water-flooded layer curve, through logging curve optimization, data preprocessing and algorithm model optimization processes, a rapid identification model of water-flooded layer suitable for this block is established. The results show that the HAC, CAL, RLLS and RMG curves with hidden duplicate information can be removed through the correlation screening of logging curves and the importance score of the tree model, which can reduce the amount of data calculation. When the four algorithms are used to identify the flooding level of each layer, the recognition rate of the XGboost algorithm can reach up to 95.45%; the reliability of this result has been confirmed in the model verification process (87.89%), which further shows that the model can be used to identify Xingbei area flooded.

In this paper, through technological research and development, we will improve the existing technology of domestic wind / light complementary power stations, apply wind power generation equipment with a single unit capacity of 5kW and 10kW in Xiangmao Township, Naqu City, Tibet, and optimize the system design. The completed power station will supply power to 42 herdsmen in Xiangmao Township through centralized power supply, and use the form of wind and light complementary coupling power generation to reduce the construction cost of the power station and improve the reliability of the system, It will provide a scientific basis for the next promotion and application of wind and solar projects.

In recent years, the corrosion problem of equipment and pipeline caused by oilfield produced water is becoming increasingly serious. In this work, corrosion inhibitor of triazine, synthesized from formaldehyde and ethanolamine, was evaluated using weight-loss techniques. The triazine was found to inhibit the corrosion of mild steel in simulated oilfield produced water. The adsorption of inhibitor was studied, which was consistent with the assumption of Langmuir adsorption model. Thermodynamic parameters of corrosion inhibition process were further calculated and analyzed, which indicated that adsorption of triazine inhibitor was exothermic, spontaneous and physical process.

In order to give full play to the efficiency of power generation and improve the utilization rate of water resources, the optimal operation of reservoir power generation has become one of the hot researches by the experts and scholars. Luntan Key Water-Control Project is taken as an example, which gives consideration to the comprehensive benefits of flood control and power generation. Based on building both the mathematical models of flood pre-release control and the medium-long term power generation, a decision support system with fast online optimization is developed by using SOA architecture and J2EE technology. The results show the system can improve the operation level of the reservoir power generation, reduce effectively the water abandoning rate, realize the scientific optimal operation, provide scientific basis for the management decision, and create more comprehensive benefits.

The utilization of urban underground space is a strategic choice to solve land space shortage, traffic congestion and environmental pollution. The underground corridor serves as both commercial and entertainment spaces. Proper natural ventilation system is believed to combine the advantages of good indoor air environment and high energy efficiency. In the present study, field experiments and numerical simulation are performed to compare the natural ventilation performance in the underground utility corridor under different layout of gates and skylights during the transitional season. The results show that the overall Richardson number is calculated to analyze the dominant driving force of the corridor. Second, it has been found that the arrangement of skylights and asymmetric gates can well promote natural ventilation in the corridor. The air exchange rate of the corridor with asymmetrical outlet is 10% higher than that with symmetrical outlet under the conditions in this study. Third, the wind speed at the openings in the middle of the corridor is higher than that of other openings in the corridor with skylights.

Natural gas hydrates gradually become the focus of new energy resources, and the study of hydrate exploitation is growing vigorously during recent years. Well cementing is an important process during energy exploitation, especially when encounters hydrate bearing sediments in deep-water oil and gas drilling, showing great research significance and becoming a research hotspot. In this study, the exploratory well of SH2 of GMGS-1 project is chosen as the object of study, a cementing model of two dimensions based on this exploratory well is build, the invasion process of cement slurry is reappeared by TOUGH+HYDRATE, and the physical properties response of hydrate reservoirs during the cementing process is analyzed based on the numerical simulation data. In which, a view of “continuous stage simulation” to solve the problem of dynamic heat release of cement slurry is created and used for the first time. Result illustrated that the invasion behavior of cement slurry almost only occurred during the stage of holding pressure, the temperature has significantly increased in the area of reservoir which is invaded by cement slurry. At the same time, a large amount of decomposed hydrate have generated gas and water, which form high pressure region and transfer toward the deeper of reservoir. However, the variation in the temperature is not significant and the hydrate barely no longer decomposed in those area which outside or even though close to this area. There also have generated secondary hydrate closed to the area of decomposition and formed high saturation zone of hydrate. The results also proved the feasibility of “continuous stage simulation”, and played a guiding significance for the field well cementing.

This study focus on the synthesis of amorphous silicon nanoparticles and understanding the formation mechanism. Counter-flow quenching gases with different flow rates were injected from downstream of the torch to understand the effect of quenching gas on the formation of silicon nanoparticles. Transmission electron microscopy show that nanoparticles with spherical shape and agglomerates consist of smaller particles were synthesized. X-ray diffraction analysis is used to calculate the amorphization degree, which is defined as fraction of amorphous silicon in the silicon nanoparticles including both crystal and amorphous. The obtained results show that higher quenching gas flow rate leads to smaller diameter with higher amorphization degree. Electron diffraction patterns reveal that nanoparticles with diameter less than 10 nm are amorphous and agglomerated together, while for the nanoparticles with diameter larger than 10 nm are crystal. The formation mechanism of amorphous silicon nanoparticles is explained by estimated nucleation temperature and experimental results. Consequently, silicon nucleates at about 2400 K and then silicon vapor condenses on the nucleus. Finally, smaller nanoparticles will keep amorphous phase, while nanoparticles with a larger diameter grow to form crystalline.

At present, a lot of passenger cars and light trucks are equipped with the dual mass flywheel, which can decrease the non-uniformity of the indicated engine torque. In engine bench test, the secondary mass of the dual mass flywheel can’t be fixed because there is no transmission system on the test bench. As a result, the secondary mass of the dual mass flywheel will have radial and circumferential movements, which may lead to a damage to the dual mass flywheel. This paper presents an improved design of the crafting tool for the dual mass flywheel to protect the secondary mass during the engine bench test. For the improved design, the cylinder body is used for the positioning of the crafting tool, and a spline shaft and a ball bearing of centripetal adjustment are chosen to fix the secondary mass. Through this tool, the dual mass flywheel engine can be tested on the test bench without a starting shaft, and the disassembling of the engine flywheel bolts during the hot test can be avoided.

Laser thermoforming is widely used to produce rapid prototyping parts of sheet metal. Laser multiple scanning or single high-temperature scanning is often used to obtain a large bending angle. This method produces high heating temperature, which destroys the material characteristics and reduces the material use value. A method of forming at low heating temperature is proposed to overcome the aforementioned problems, and the mechanism of thermo-mechanical action is studied. Results show the positive application of preload in the low-temperature forming method can increase the bending angle by up to 39.00 times. The low-temperature forming method is important for reducing energy consumption, protecting workpiece material properties, and applying laser in practical production.

.A lead-based reactor with employing heat pipes as passive residual heat removal system (PRHRS) for longterm decay heat removal was designed. Three-dimensional computational fluid dynamics (CFD) software FLUENT was adopted to simulate the thermal-hydraulic characteristics of the PRHRS under Station-Black-Out (SBO) accident condition. The results showed that heat in the core could be removed smoothly by the PRHRS, and the core temperature difference is less than 20 K.

Nowadays, under the dual pressure of fossil energy shortage and ecological environmental pollution, new energy vehicles have flourished in our country by virtue of their clean and low noise advantages. But correspondingly, the grid connection of electric vehicles will also bring many problems. Therefore, this article attempts to explore the operating mode of electric vehicles and its impact on the consumption of renewable energy, so as to provide reasonable planning of charging facilities and improve the top-level design of the grid.

With the rapid development of information technology, educational informatization is the popularization and penetration of information technology. At present, online teaching has been implemented all over the world, which is a practical reform of educational informatization. This paper discusses the teaching concept, platform selection, study situation analysis, resource preparation, curriculum implementation, summary and reflection and other aspects of the curriculum under the background of educational informatization, so as to do a good job in the organization and management of online teaching under the background of educational informatization, and lay a foundation for the innovative practice of information-based leading educational concept and education mode.

In this paper, I-GWO-KELM algorithm is used for short-term power load forecasting. Normalize the power data and meteorological data of the short-term power load, and use GWO to optimize the regularization coefficient of KELM and the RBF kernel parameters. To apply the model to short-term power load forecasting to obtain simulations for the next 24 hours and 168 hours curve. Experiments show that the improved model I3-GWO-KELM proposed in this paper has the best effect. The improvement of GWO in this paper is effective and feasible. In the application of short-term power load forecasting, the IGWO-KELM model is more accurate than the ELM and KELM models.

This paper analyzes the application value of BIM technology in industrial building projects and the improvement of building industrialization level. Firstly, an evaluation index system of building industrialization level based on BIM technology is established, which consists of 4 first-level indicators and 16 second-level indicators; then, the Analytic Hierarchy Process is used to determine the corresponding weight value of each index; finally, the BIM platform function is used to collect data, and the fuzzy comprehensive evaluation method is used to calculate the evaluation results of the evaluated objects, so as to realize the effective evaluation of the building industrialization level.

In recent years,The economy of Heilongjiang province has developed rapidly, but the problem of air pollution, especially the haze in winter, is serious. In order to improve the ecological environment quality of Longjiang and promote high-quality economic development, the Heilongjiang provincial government has taken a series of key measures to prevent and control air pollution, and the air environment quality has been continuously improved. The prevention and control of air pollution requires the joint efforts of the government, enterprises and the public in order to win the battle against air pollution.

The paper analyzed the potential safety and stability control risk of the southwest power grid, presented the general online identification framework for operational risks of the second and third defense line of UHVDC sending-end power grid, elaborated the key techniques for realizing the aforementioned functions, including security control strategy/system protection strategy modelling, high frequency cutting generator strategy modelling , conflict detection for the control measures of the second and third defense line, practicability assessment method for security control strategy/system protection strategy, practicability assessment method of high frequency cutting generator strategy and other technologies. According to the actual application conditions of the southwest power grid, the system may provide dispatching users with more comprehensive Online identification for the operational risks the second and third defense line as well as discover the potential safety hazards and risks during operation of the power grid.

In this work, we fabricated cross-linked pre-oxidized polyacrylonitrile nanofibers (PPNF) coating SO3H-UiO-66 coated (named SU6@PPNF), which was introduced into sulfonated poly (ether ether ketone) SPEEK to produce membrane with superior proton conductivity, dimensional stability and mechanical properties under hydrated condition. The membrane displays a maximum power density of 172.1 mW cm-2 under 100% RH and 60 °C, which is an increase of 12.2% compared with primary membrane.

The price of pork in China has been soaring since 2019, which has attracted much attention of the public. The price sensitivity of pork is an important reference for enterprises' pricing strategy. The paper studied consumer’s price sensitivity of pork by 217 consumer questionnaires of Chuxiong in Yunnan province. The results show that: 1) the price sensitivity for pork between men and women is almost the same, indicating that gender shows no difference in pork price sensitivity. 2) Age is positively correlated with pork price sensitivity. 3) Those consumers, who bought pork at shopping malls, food markets and affordable supermarkets, are high in price sensitivity, while the ones who bought pork online were low. 4) Household income is negatively correlated with pork price sensitivity. 5)When the price of pork rises to a price that consumers can't afford, the proportion of consumers who choose chicken, duck, fish, beef and mutton as substitutes is 37%, 18%, 28%, 10% and 7%, respectively. Enterprises should develop pricing strategy accordingly.

Using panel data from China’s tobacco manufacturing industry from 2014 to 2018, the DEA-Malmquist method is used to measure the green total factor productivity of China’s tobacco manufacturing industry on the basis of comprehensive consideration of environmental pollution and energy consumption. The study found that from 2014 to 2018, the Malmquist index of green total factor productivity of China’s tobacco manufacturing industry basically showed a fluctuating upward trend; the technical level of 2014-2017 needs to be improved, and the technical level of 2017-2018 has begun to improve.

In this study, the electrochemical softening method was used to treat the simulated drainage of the converter station, and the treatment effect under different water inlet conditions was investigated. The results show that the hardness removal rate is from 10% to 80% when the residence time is from 0.5h to 4h, and the longer the residence time is, the higher the removal rate is. The maximum scale removal capacity reached 2.67g/h/m2 when residence time was 1h. Through the formula fitting of several groups of tests, it is concluded that the removal effect can be expressed by the formula C0/C=0.9627e(17.73at/V) under different water intake (residence time).

Accelerating the transformation of the energy consumption pattern in western China and promoting the development of clean energy are the main problems facing the energy consumption system. This paper bases on the characteristics of China’s western region the industrial structure, the energy consumption structure, and analyses the energy consumption model transformation trend of typical of the west, on this basis, the combination of time series analysis and ARIMA model is used to set up different typical energy consumption in the field of forecast and analysis, and put forward according to the results of the analysis of energy consumption model transformation.