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The cybereconomy provides new momentum for the traditional economy, adds new formats and models, and is the main momentum for China’s economic progression. Therefore, the cybereconomy level of 30 provinces in China from 2011 to 2019 is measured by constructing a comprehensive index system and an econometric model to explore the impact of the cybereconomy on the marketization process and its internal mechanism. The results show that the cybereconomy has significantly promoted the development of the marketization process, and government intervention has inhibited the promotion of the cybereconomy to the marketization process. The research result has crucial academic and realistic significance to accelerate marketization, enhance the overall innovation ability, and build a modern socialist country.

With the progress of science and technology, artificial intelligence plays a vital role in the procedure of high quality economic growth. By the Bartik instrumental variable method, this paper research the level of artificial intelligence in 30 provinces and propose an framework to examine the correlation between artificial intelligence technology and economy. The results show that artificial intelligence technology has significantly promoted high quality economic growth, and the level of urbanization has enhanced the role of artificial intelligence in hoisting high-quality development. This result helps to clarify the economic effects of artificial intelligence and offers a theoretical reference for improving the science and technology evaluation system and data for studying the effect between artificial intelligence and economy.

So as to explore the mediator effect of green technologic innovation on the impact of digital economic on circulation industry, based on the panel data of 30 provinces in China from 2011 to 2019, this paper constructs a panel fixed effect model and a mediator effect model for empirical analysis. The results show that the digital economic significantly boosts the advance of the circulation industry; through the mediator effect model test, it is found that the digital economic can boost the advance of the circulation industry through green technologic innovation, and the mediator effect is 57.28 %. Finally, from the aspects of strengthening green technologic innovation, talent support, improving digital economic infrastructure and policy support, this paper puts forward some suggestions on promoting the advance of circulation industry by digital economic.

The valve is one of the important parts of the reciprocating compressor, which directly affects the thermodynamic process and reliability of the compressor. In this paper, acoustic emission (AE) technology is used to predict the dynamic characteristics of valves. The AE signal of the compressor valve is analyzed based on the deep learning method, and the mapping relation between the AE signal and the dynamic characteristics of the valve is obtained. The results show that the prediction accuracy of the models trained by Long Short-Term Memory (LSTM) artificial neural network and Convolutional Neural Network (CNN) is 97% and 95%, respectively, which can accurately predict the dynamic characteristics of the valve. Although the prediction results of CNN are slightly lower than that of LSTM network, the calculation speed of CNN is relatively faster.

With the continuous growth of China’s elderly population, the demand for elderly care services has increased dramatically. Due to the influence of Chinese people’s cultural concept of elderly care, most of the elderly are more inclined to home-based care, enjoy the happiness of children and grandchildren, and enjoy family happiness. At present, there are some problems in home-based health care services, such as lack of professional talents and single service mode. This entrepreneurial project which is proposed by Wish Magic has grasped the pain points of China’s elderly care problems, and brought about some problems. Efforts should be made to build a sharing platform for elderly care services, attract professionals to provide professional services for the elderly, and hold diversified activities to meet the material and spiritual needs of the elderly. The planned market strategy of the project is divided into three steps. Firstly, the project will be carried out in the first and second tier cities, and then expanded to the third tier cities. Later, the market will be expanded to the fourth tier cities. At the same time, the project will cooperate with government departments to strive for government funding and policy support, and provide accurate services in combination with online and offline ways, so as to meet the diversified pension needs of the elderly.

A-D-A types non-fullerene small molecule acceptors (NF-SMAs) have achieved excellent progress in recent years, while the development of series of new materials. Herein, a new NF-SMA, named BDSe-4F, based on linear benzo[1, 2-b:4, 5-b’] diselenophene with the difluorinated 5, 6-difluoro-3(dicyanomethylene) indanone (IC-2F) was synthesized and investigated. Due to the introduction of IC-2F, the intramolecular charge transfer is enhanced. Furtherly, the BDSe-4F exhibits a wider absorption from 600-800 nm in solution. From solution to film, the absorption spectrum shows an obvious red-shifted in the range of 800-900 nm and the maximum absorption peak red-shifted at 31 nm, suggesting that much stronger intermolecular interactions caused by non-covalent bond of F....S,F.... Se, and S....O. The BDSe-4F possesses good spectral absorption range and excellent molecular stacking, which beneficial to achieve high JSC and electron mobility. These results illustrate that the synergistic strategy of using benzo[1, 2-b:4, 5-b’] diselenophene core unit and IC-2F end group is a promising strategy to enhance performance in organic solar cells.

At present, dihalogenated 1, 1-dicyanomethylene-3-indanone (IC) have attracted widely attention as terminal unit. Here, our work designed and synthesized a new nonfullerene small molecule acceptor material BDSe-FBr, with simultaneously fluorinated and brominated terminal. Due to that bromine atom has more electrons and larger size, and fluorine atom enhanced intermolecular π-π packing, BDSe-FBr present strong absorption abilities in solution and film. It shows a broad absorption range of 600–800 nm and 700– 900 nm, with the maximum absorption peak in solution and film of 742 nm and 774 nm, respectively, and the optical band gap of BDSe-FBr is 1.40 eV. The results are beneficial for high JSC and less energy loss and these strong absorption abilities are due to that bromine atom has more electrons and larger size, and fluorine atom enhanced intermolecular π-π packing. The multiple interactions between heteroatom also is beneficial to improve charge transportation and crystallinity. This new A-D-A type small molecules with simultaneously fluorinated and brominated end-group provide an effective strategy to improve photovoltaic performance of acceptor. The introduction of fluorine and bromine atoms simultaneously into the terminal group exhibits great prospects for application in high performance OSCs.

In order to understand variation characteristics of the soil available phosphorus and total nitrogen (TN) content around the roots of typical desert plants Peganum harmala Linn. (PHL) and Asterothamnus centrali-asiaticus (AC), which are widely distributed in Jinchang mining area of Gansu Province, the soil samples around the roots of the two plants were collected, and the contents of available phosphorus and TN were analyzed. The results showed that the change trend of soil available phosphorus content was not the same in the range of 0-60 cm around the roots of PHL and AC. In most areas the change of available phosphorus content in the soil from around the root of PHL was U-shaped, and the content of phosphorus around the roots of AC increased firstly and then decreased, while the change trends of TN content around AC was decreased gradually.

Rural houses in severe cold areas of China are mostly single-storey independent buildings with large shape coefficient. Compared with urban residential, it has larger contact area between envelope and outdoor environment of each household. Meanwhile, the heat transfer coefficient of window is usually greater than that of external wall and roof. The window-wall ratio is one of the important indicators affecting the energy consumption of rural house. This paper takes window-wall ratio as the main variable, building orientation, thermal performance of envelope and window heat transfer coefficient as the auxiliary variables, and applies DesignBuilder software to quantitatively analyse the mechanism of window-wall ratio on rural house’s heating energy consumption under the interactive influence of multiple factors. Results show that the influence rule of window-wall ratio with different orientations on heating energy consumption will change when the thermal performance of envelope or window heat transfer coefficient changed. The synthetic effect of various factors should be considered in the design to reasonably determine the windowwall ratio of rural house.

In urban scale, solar energy utilization potential is closely related to residential density. Taking Xining City as an example, this paper explored how density of urban residential area affects solar energy utilization potential of urban housing. By changing density related design variables , including building layout, density rate, floor-site area ratio and the number of floors, 36 general models of residential areas with low, medium and high density are Abstracted. The results show that solar energy utilization potential of buildings varies greatly with different density related design variables. Comparison of a number of different scenarios reveals how density related variables affect solar energy utilization potential, based on which suggestions for optimization of solar energy potential for urban residential areas in their initial planning and design stages are proposed.

Using the early maturing peach variety 'Japan Matsusen' as the test material, nine groups of formula fertilization schemes were set up by orthogonal experiment to study the effects of different fertilization treatments on the quality of peach fruit, in order to obtain the best fertilization formula to improve fruit quality. The results showed that the quality of peach fruit was significantly improved by adding organic fertilizer to the base fertilizer instead of chemical fertilizer. Therefore, by adding organic fertilizer as the base fertilizer, reducing the application amount of chemical fertilizer, and adding other trace element fertilizers can effectively improve the quality of peach fruit.

Zinc is an essential nutrient for plant growth and development. Zinc deficiency affects plant photosynthesis and nitrogen metabolism. In this experiment, 'Shine Muscat' grape was used as experimental material. Three soil application levels of zinc sulfate were set up, which were 2 kg/667 m2, 3 kg/667 m2 and 4 kg/667 m2, respectively. The time of applying zinc fertilizer in soil was 10 days after flowering, and the time of spraying zinc fertilizer was divided into 21 days after flowering, 35 days after flowering, 21 days and 35 days after flowering, respectively, once (twice in total), with no zinc fertilizer as control (CK). The results showed that the application of zinc sulfate 3 kg/677 m2 on soil 10 days after flowering, 0.3% zinc sulfate fertilizer on leaves 21 days after flowering and 35 days after flowering increased zinc content in grape leaves and fruits, and significantly increased net photosynthetic rate of grape leaves.

We investigate the performance of low-density parity-check (LDPC) coding for free space optical communication (FSO) with modified Bessel-Gaussian (MBG) beams based on K-distribution. Based on an extended Huygens–Fresnel principle, the receiver plane intensity isformulated and then we analyze the propagation characteristics of MBG beams traveling in aturbulent atmosphere. Numerical calculations show that the interaction of the transmissiondistance, refractive index structure constant, and wavelength will affect the imaginary term inthe beam, allowing the beam to exhibit the properties of the MBG beams. To further improvethe communication quality of the FSO system, we introduce a fast Quasi-Cyclic (QC)Low-Density Parity-Check (LDPC) code. Simulation results show that under weak and strong turbulence conditions, the performance of the QC-LDPC code becomes better and better as the code rate increases, and the bit error rate (BER) keeps decreasing as the code rate increases.

In order to obtain reasonable parameters in the design of driving system of multi-axis hydrostatic transmission vehicle, the working principle of single-side drive of hydrostatic transmission vehicle is introduced. The matching and control of engine and hydraulic pump are analyzed. According to the driving equation of vehicle, The driving force required for driving system is determined, and the parameters of hydraulic motor, hydraulic pump, system working pressure and braking system are designed and calculated, which provides the parameter design for driving system of multi-axis hydrostatic transmission Reliable theoretical basis.

Aiming at the control problem of driving system of hydrostatic transmission chassis, the composition of the control system of hydrostatic transmission chassis is introduced and the control method of dual engine is solved. According to the number of driving axles in driving process, The external characteristic curve of the engine controls the variable hydraulic pump by one parameter, controls the rotational speed of the variable hydraulic motor according to the change of the vehicle speed, and introduces the control flow of the brake system. It provides a reference for the design of driving control system of multi-axis hydrostatic transmission chassis.

This paper initially investigates the conventional LCL filter grid-connected inverts system, which introduces the control strategy with inverter-side current feedback, and analyzes the deficiencies within the strategy. The stability of the controller can be improved by adopting the active damping scheme. However, the output current of the inverter is severely influenced by the external grid voltage distortion and the grid low-order harmonic voltage. In order to reduce this impact and gain high-quality power, a novel control strategy is proposed in this paper, in which the virtual complex impedance is introduced to feed grid voltage forward. By using the proposed control strategy, the total harmonic distortion can be greatly decreased, allowing the grid current to synchronize the reference current well. In addition, the modulation of the virtual complex impedance by controller can also quantificationally regulate the equivalent output impedance, which brings great convenience for inverters system designers to calculating and devising. Simulation results are presented to prove the validity and improvements achieved by the proposed controller.

Globoidal cam mechanisms with oscillating and dual stopping followers are necessary to accomplish the rise-dwell-fall-dwell periodic motion.The trajectory surface of roller axis of oscillating globoidal cam mechanism is the offset surface of working surface of the cam, and its mathematical model is relatively simple. According to the spatial geometric relationship, the coordinate equation of trajectory surface of roller axis is derived and the original angle positions for dual stopping followers are analyzed. As a result, the three-dimension (3D) model of globoidal cam mechanism with oscillating and dual stopping followers is generated based on the offset surface method based on the UG software. Finally, the dynamic model is realized using Adams software, and through the dynamic simulation, the oscillating angle displacement, angular velocity and angular acceleration of the double-stop swinging cam mechanism are studied. According to the simulation results, it can be concluded that the input speed of globoidal cam mechanism is an important factor that affects the output performance of the mechanism. Through the above research, it can provide some reference for the design of spatial cam mechanism.

This paper conducts the research on the attention sates based on ERP analysis when the subjects are under the quiet, flute and zither background music. The amplitude and latency of P300 are analyzed. The results show that there are greater P300 amplitudes and smaller P300 latencies of CZ, PZ, OZ and CP3 in music background than those in quiet background. The PCA and ICA achieve to select the effective data components and the head model is reconstructed. The active degree of brain areas are analyzed by using the source location methods. The result shows that the brain’s excitement is very obvious under the Bach's flute background. The study also indicates that some background music might help to improve the attention.

This paper introduces an efficient intra-field deinterlacing algorithm using bilateral filter while considering both closeness and similarity between the interpolated pixel and the neighbor pixels. Instead of estimating the edge orientations via limited candidate directions as previous intra-field deinterlacing methods, we propose an adaptive spatial locality- and similarity-based deinterlacing method. Many deinterlacing methods described in the literature only consider the similarity between neighbor pixels and interpolated pixels; however awareness of distance correlation and spatial locality has not yet been studied. Experimental results indicate that the proposed scheme outperforms a number of existing approaches, in terms of both the objective and subjective performance.

Представлены результаты процесса спорадического формирования китайской диаспоры на Дальнем Востоке России. Выявлены наиболее дискуссионные элементы данного процесса: сложность определения значения понятия «китайская диаспора» и даты зарождения самой диаспоры в указанном регионе; дискуссия относительно численности китайского населения на Дальнем Востоке на рубежах XIX–XX и XX–XXI вв. Автором проведен кластерный анализ регионов Дальнего Востока России на предмет функционирования там китайской диаспоры с использованием данных относительно их площади, численности населения, величины ВРП на душу населения и количества убийств на 100 тыс. чел. Каждый из этих показателей характеризует ключевые сферы развития регионов Дальнего Востока России. По результатам построения кластерного дерева, выделения трех групп субрегионов Дальнего Востока и проведения картографического районирования региона было выявлено, что географическая близость указанных субрегионов к китайской территории значительно сильнее влияет на формирование китайской диаспоры, чем экономический фактор. Отдельно при этом можно выделить Якутию, которая концентрирует 42 % представителей китайской диаспоры Дальнего Востока.

The increase in carbon dioxide emissions is a key factor leading to the warming of the Earth’s climate system and the intensification of the greenhouse effect. Internal combustion engines have a significant impact on carbon emissions. For internal combustion engines, friction is the main cause of energy loss, which reduces fuel utilization and increases carbon emissions. Therefore, it is necessary to reduce friction work of internal combustion engine. This work focuses on the friction pairs of piston pins and liners in internal combustion engines, and optimizes the surface technology of piston pins by comparing carburized and nitriding processes. The results show that the friction work of the nitrided piston pin is 8.9% lower than that of the carburized piston pin, and the wear of the liner is reduced by 10%. Therefore, surface nitriding process of piston pin is an effective way to reduce friction work and carbon emissions of internal combustion engines.

With the increasing global demand for safe drinking water, the search for effective and economical water treatment technologies has become an urgent need. Ultraviolet (UV) light sterilization is a proven method for eliminating bacteria in water, but traditional UV systems often rely on mercury lamps, which pose potential environmental and health risks. In recent years, the development of UV-LED technology has offered a new solution for water treatment. This article provides a detailed explanation of the working principles, technological advantages, and applications of UV-LEDs in water treatment. By comparing them with traditional UV systems, UV-LEDs not only demonstrate lower energy consumption and longer lifespan, but also avoid the use of toxic mercury. Despite current challenges in cost and technological maturity, the environmental friendliness and efficiency potential of UV-LED technology indicate a promising market outlook. This article aims to provide a comprehensive review of UV-LED technology for practitioners and researchers in the water treatment industry, and to explore its future development directions.

The structure and material of automotive B-pillar have a significant impact on side collision safety. Through collision simulation analysis and orthogonal experimental design methods, a comparative analysis was conducted on the upper and lower materials of the B-pillar outer panel, as well as the boundary line. The intrusion amount and intrusion velocity were used as evaluation criteria to find a better match for protecting passengers inside the vehicle. The research results showed that after optimization, the maximum intrusion amount of the B-pillar outer panel is reduced by 14.7%, and the maximum intrusion velocity is reduced by 7.4%, which can effectively reduce the impact and compression injuries to passengers inside the vehicle.

Objectives: More convenient and effective non-invasive diagnostic methods are essential for the detection and prognosis of cancer. This study aimed to mine the information in plasma cfDNA to find novel biomarkers for the diagnosis of esophageal cancer (ESCA). Methods: Blood samples were collected from esophageal cancer patients and healthy individuals. SALP-seq method was used to construct libraries and sequence cfDNA samples from 40 esophageal cancer patients and 10 normal cfDNA samples, and mutation analysis was performed. Results: Esophageal cancer related mutational signatures and 52 mutated genes were identified. Many of these genes are known cancer-related genes. Mutations in these genes were also found in 11 additional ESCA cfDNA samples. Conclusion: SALP-seq based cfDNA mutation analysis can obtain reliable and verifiable biomarkers for ESCA. These biomarkers provide a novel reference for the diagnosis of esophageal cancer, as well as offer novel insights into understanding the cellular and molecular mechanisms of esophageal carcinogenesis. Finally, our method provides a new avenue to explore novel cancer biomarkers.

Energy-saving buildings have become a topical issue and widely used the energy-saving ventilation design, which aims to maximize the use of natural ventilation while reducing demand on mechanical ventilation. In this research, natural ventilation performance of two different semi-enclosed building layouts, "O" type and "L-L" type, are studied by numerical simulation. According to the simulation results, in the "O" type, the maximum indoor air velocity occurs in building A (orientation facing the inflow direction). The minimum indoor air velocity occurs in building C (orientation facing building A). In the "L-L" type, the maximum indoor air velocity occurs in building A (orientation facing the inflow direction). The minimum indoor air velocity occurs in buildings B and D (orientation parallel to the inflow direction). And air flow field simulation results show that, the "L-L" type exhibits better than the "O" type in natural ventilation. Furthermore, simulation results show that the natural ventilation performance in the room is influenced not only by the building orientation, but also by the window size.

In this paper, the kinematics and dynamics model of the ship’s six-degree-of-freedom simulation swing platform were studied. Then, a random wave and ship motion response model was established, and a six-degree-of-freedom motion model of DP ship in four-level sea state was established and studied by using the open source MSS toolbox, which lays a foundation for the subsequent simulation and control strategy research. The ordinary PID controller and fuzzy PID controller were designed and simulated, and the results were compared to verify the effect of fuzzy PID controller.

"Industry-university-research" collaborative education mode is a kind of personnel training mode that closely combines industry, academia and research. This study aims to explore the reform and practice of biological innovation and entrepreneurship education with the goal of improving both ability and quality, and focuses on the application and effect of "industry-university-research" collaborative education mode. Through in-depth analysis of the current situation and problems of biology education, we aim to put forward targeted reform measures and methods to provide useful reference for the development of biology education.

The operation of reservoir is to optimize the utilization of water resources and bring its maximum benefit. Most studies of reservoir scheduling generally pursue the maximization of revenue, and rarely consider the demand of water supply from reservoirs to agriculture or factories in the scheduling process. The few studies that have taken this into account have included this demand in the objective function or constraint, rather than in terms of marginal benefits. This work presents a method to determine water supply decision of reservoir based on marginal benefit. By iteratively linearizing the cascaded reservoir scheduling model and calculating the optimal solution to the dual problem of the model, this method provides a reference for the water supply plan of reservoir to agricultural departments and factories. The proposed method has been applied to 8 reservoirs on the Jinsha River cascade. Convergence in water head is achieved after 15 iterations, and numerical comparisons of the marginal value of water resources at different locations and periods across various reservoirs are obtained.

The self-construction of the sustainable development guarantee system for international cooperation and exchange in vocational colleges is an activity that draws on the advanced experience of domestic and foreign vocational colleges, combines reality with the school situation, and localizes and innovates international experience. Each country has its own national conditions, and each vocational college has its own specific situation. International experience cannot be blindly copied, and all universities cannot operate in a homogeneous manner according to a single model, let alone turn internationalization into Westernization. The prerequisite for maintaining vitality through internationalization is localization. Vocational colleges selectively absorb good concepts, ideas, and practices from foreign education, integrate their own characteristics and culture, extract methods and models suitable for national conditions and school conditions, and transform and innovate them. They compile normative institutional documents for implementation, thereby promoting the integration of internationalization and localization.

Biological control of Verticillium wilt caused by Verticillium dahliae is a green and sustainable strategy. However, the antifungal activities of different amounts of biocontrol bacterial are still not understand. This study investigates the antifungal activity of different amount of Bacillus amyloliquefaciens FH1-RS1 and Bacillus cereus R19 against Verticillium dahliae V991 by dual culture plate. The results showed that both the fungal inhibition rate (FIR) and far fungal inhibition rate (FFIR) of B. amyloliquefaciens FH1-RS1 elevated with the increasing volume. The highest FIR (77.78%) and FFIR (58.33%) of B. amyloliquefaciens FH1-RS1 were both in 22 μL volume (7.2 × 108 CFU/mL). The highest FIR of B. cereus R19 was 48.15% in 12, 18 and 20 μL volume (1.2 × 108 CFU/mL). The highest FFIR of B. cereus R19 was 38.89% in 6 μL volume. This suggests that not all biocontrol bacteria have higher antifungal activity in higher amounts.

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.

National cultural park is an innovative initiative for the protection and development of natural and cultural heritage resources in the new era, reflecting the core strategy of cultural heritage protection and development of representative cultural resources. It is not only an important carrier for the protection of natural and cultural heritage, but also a new model for promoting the development of cultural industry. Based on their own national conditions and experiences, countries have developed distinctive national park management models, including the native recreation value orientation of the United States, the sustainable club economy of Europe, the public supremacy of private ownership of land in the United Kingdom, and the synergistic community-neighborhood development of developing countries in Asia and Africa. In view of the heritage resources brought by the Beijing Winter Olympics, this study explores the idea of ice and snow tourism routes centered on Beijing, Yanqing and Zhangjiakou, and proposes the principles of sustainable development, mutual benefit and symbiosis, and public supremacy, which is committed to constructing a development model integrating culture, tourism and ecology.

With society developing at a rapid pace and higher education opportunities for the public, more and more individuals realize the potential for gender stereotypes and discrimination in our daily lives, especially for women. Even some media utilize this situation to construct gender opposites in order to catch a specific target. According to this phenomenon, this paper is supposed to search for the factors that cause gender inequality in order to relieve this situation and analyze the relationship between gender stereotypes, discrimination, and gender opposites. The approach for this paper is to search considerable literature and related database to prove the viewpoint and list three main factors that influence an individual’s erroneous cognition. Moreover, this paper concludes that the one reason some individuals have gender oppositional psychology is because of gender stereotypes and discrimination. Therefore, this paper comes up with suggestions to improve it from the education aspect, the society aspect, and the media aspect.

Talents are an important symbol of a country’s comprehensive strength. Accounting talents, as an important component of modern society, are an important support for promoting economic development. Especially with the rapid development of digitalization and the continuous emergence of new business formats, technologies, and business models in social development, cultivating comprehensive talents that adapt to social development has become an important topic and reform direction for accounting talent cultivation. However, under the significant impact of the epidemic, issues such as an increase in the number of graduates majoring in accounting, a lack of social practice, and a mismatch between abilities and positions have become prominent. This article is oriented towards high-quality employment and analyzes the training path of accounting talents from the perspective of integrating enterprise business and financial business. It attempts to address the challenges arising from changes in employment structure and environment, achieve efficient integration between accounting talents and society, and meet the special needs of society for accounting talents.

Sludge pipeline transportation is increasingly used in different fields. Flow resistance is an important influencing factor in the pipeline transportation of solid-liquid two-phase flow slurry, and studying its characteristics is of great significance for optimizing pipeline design, reducing pipeline erosion and wear, and reducing transportation energy consumption. In view of the complexity of sludge as the resistance characteristics of solid-liquid two-phase flow, it is often necessary to analyze the inline mechanism of solid-liquid two-phase flow in slurry with the help of high-precision turbulent flow model in computational fluid dynamics (CFD), which has become the research focus of heterogeneous solid-liquid two-phase flow pipeline transportation. This paper analyzes and summarizes the CFD simulation status of heterogeneous solid-liquid two-phase flow resistance in pipelines, points out the future research direction, and provides reference for the analysis of heterogeneous flow resistance of sludge pipeline transportation and the optimization design of conveying system.

The water-cut rises quickly and the remaining oil distribution is complex when the ultra-low permeability reservoir enters the high water cut stage. The comprehensive use of reservoir engineering, dynamic monitoring, numerical simulation, core experiments and other methods, this paper systematically summarizes three types of water-driving law and distribution characteristics of remaining oil, which are pore-fracture flow, pore-fracture flow and fracture flow. It is considered that the horizontal water drive is mainly controlled by material source, well pattern and fracture, while the vertical water drive is mainly controlled by reservoir heterogeneity, water line distance, injection-production well distance, etc. , the patterns of residual oil formed by different types of percolation are different, in this paper, 7 macroscopic patterns of remaining oil distribution, such as well pattern control, heterogeneity control, single sand body connected control, longitudinal interference, injection-production non-correspondence and non-main reservoir unutilized, are summarized, in the light of different remaining oil patterns, the paper puts forward the adjustment direction of tapping potential, such as optimizing injection-production structure, optimizing injection-production mode.

Based on the 2019 satellite remote sensing data, the survey was conducted on the open-pit stopes of the building sand mines in Shigatse, Tibet, and the relationship between the number of stopes and the area, population and population density of the district/county, as well as the distribution characteristics between the main built-up areas, administrative villages and traffic roads at the county level were analyzed. This study tentatively links the open pit of building sand mine with human aggregation and human activity space, analyzes the possible correlation, distribution rules and change characteristics between it and the typical elements of social economy, and provides a research basis for improving the efficiency of mining administration in western China.

In recent years, due to the pollution of heavy metals in the environment, it has brought a serious crisis to my country's ecological balance, especially the pollution of heavy metal mercury (Hg), so the repair of mercury in the environment is crucial. At present, there are many technologies for repairing mercury in the environment. The main repair techniques include physical repair technology and chemical repair technology. However, there are many problems in these two repair methods, such as high repair costs, and it is easy to cause secondary pollution. Microbial repair method is a method of repairing the environment. It can not only adsorb and fix heavy metal mercury, and does not bring pollution to the environment. Therefore, using microorganisms to remove mercury in the environment is by far the most promising environmental repair technology.

As the issue of aging society gradually emerges, it has attracted widespread attention from society. Among them, the issue of the demand of some elderly groups for online course learning has also caught the attention of the authors. The aim of this thesis research is therefore to help the elderly adapt to an intelligent society as an entry point, to enable them to embrace the beauty of the Internet and to promote the achievement of active aging as the ultimate goal. This paper uses questionnaires and interviews to research older people aged 55-60 through online and offline research. It also provides research data to discover the current problems of elderly users and proposes solutions. It provides new directions for companies to develop business models for the elderly.It also enriches the theoretical connotation of the concept of senior communication and allows for further cross-disciplinary field integration between aging communication and business strategy.

To address the problem of inconsistent empirical results in the literature on factors influencing corporate innovation, this paper uses meta-analysis to analyze 60 empirical research papers with 17,911 independent samples. It was found that a total of 12 factors significantly affect firm innovation, with trust having the highest degree of influence and structural hole having the lowest degree of influence. It was also found that industry type, location factor and performance type have moderating effects on corporate innovation and its influencing factors. This paper sorts out the influencing factors of corporate innovation, which to a certain extent solves the problem of inconsistent findings in related studies and provides some reference for the subsequent innovation activities of enterprises.

The exchange rate between the US dollar and the RMB has been changing over the past year. Through the analysis of daily changing data, the direct calculation of linear regression will lead to the overall upward trend of the data, but not the rise and fall of the exchange rate. Therefore, it is necessary to introduce a more accurate ARIMA model to predict the possible development and change of data in a short period of time and analyze what policy causes the sharp fluctuations of data in a short period of time. In the process of applying the ARIMA model, this paper analyzed the shortcomings of ordinary linear regression and therefore proposed how to select the appropriate model for different data processing. The research results of this article provide more beginners in statistics with ideas for solving problems: prediction problems that cannot be solved by simple linear regression and existing elementary models can be analyzed using certain time series models, and reasonable explanations for data changes can be given based on existing policy reasons, Including irresistible inflation and the United States' own adjustment to the Federal Reserve's interest rate hike.

With the accelerated industrialization and urbanization, more and more companies are discharging waste water, sludge and gas in their production processes, as well as the unreasonable use of pesticides and fertilizers, resulting in the accumulation of heavy metals on agricultural land and causing serious soil pollution problems. Soil pollution not only reduces the yield and quality of crops, but also endangers human health through the food chain. Since the release of the "10-Chapter Soil Pollution Action Plan", there has been unprecedented attention in dealing with heavy metal pollution in the environment, and the choice of treatment technology and materials is very important. Therefore, this paper discusses the remediation technology after environmental pollution by heavy metals in soil as an example.

Radioactive waste generated in nuclear energy utilization poses great environmental risks, and the safe disposal technology has become a hot research topic in the field of nuclear environmental security. Immobilization is a common radioactive waste disposal technique, and the leaching resistance of the solidified body is the key to safe disposal. In the study, metakaolin was used as a raw material to solidify strontium, a common nuclide in radioactive waste streams, and then conducted leaching resistance tests. Using control variables, the experiments were used to investigate the effects of adsorption pretreatment prior to solidifying, solidifying with and without the addition of adsorbent on the effect of immobilization. The leaching resistance of the solidified bodies were investigated in three leaching environments: 25℃ deionized water, pH=1 sulfuric acid solution, and 5%wt magnesium sulfate solution during the 42d test cycle. The results showed that both leaching rate and cumulative leaching fraction of the 42d samples for the leaching resistance of radioactive waste immobilization under the environment of deionized water at 25℃. For the three leaching conditions, the adsorption pretreatment with (4:1)MnO2/HMSS before solidifying or the addition of (4:1)MnO2/HMSS while solidifying could effectively improve the leaching resistance of solidified body, and the former was more effective. The results of this study can provide reference for the disposal of strontium-contanining radioactive waste.

With the continuous growth of economy, we are more and more aware of the importance of energy and its preciousness. In the production of crude oil, the narrow channel is the best location for oil storage, and the underlying sand body often has oil resources. In this paper, the effect of reservoir polymer flooding is taken as the purpose, the principle of polymer flooding technology as the theoretical basis, through the analysis of dynamic change characteristics, in order to improve the adjustment parameters, to achieve reasonable and efficient exploitation of oil Wells. The application of this technology, through the development of practice, has been recognized as an effective method of oil recovery.

With the rapid development of new energy, wind power, photovoltaic, geothermal and other energy sources are connected to the power grid on a large scale, showing the characteristics of system stability and reliability, complex safety characteristics, imbalance between supply and demand, and insufficient peak shaving capacity. As a flexible demand response resource, distributed energy storage can effectively promote the coordinated and stable operation of power supply and demand resources. Considering the economy and technology of distributed aggregators, an operation optimization model for their participation in demand response is constructed, and a distributed energy storage operation control strategy considering demand response is proposed, which can effectively realize peak load shifting.

Ammonium salt crystallization corrosion failure is an essential problem in the failure of high-pressure hydrogenation heat exchangers. The crystallization equilibrium curves of NH4Cl and NH4HS under different pressures were established according to the ammonium salt crystallization process in the high-pressure hydrogenation heat exchange unit, and the crystallization equilibrium temperatures of NH4Cl and NH4HS were obtained based on Aspen Plus. In addition, a prediction model for the crystallization temperature of ammonium salt was established, then the relationship between crystallization temperature and rate of ammonium salts was elaborated. The results indicate that the initial crystallization temperatures of NH4Cl and NH4HS are respectively 198.95°c and 134.45°c when the system pressure is 10MPa, and the temperature is 433.15K. The maximum crystallization rate of NH4Cl and NH4HS occur at the initial crystallization temperature, respectively 0.104kg/h and 29.23kg/h. The crystallization rate of NH4HS is three orders of magnitude higher than that of NH4Cl.

According to the experience in the construction of water conservancy and hydropower projects in the Mainland, RCC dam construction has two main advantages: the rapid construction speed of roller compacted concrete can realize early power generation, and the price of fly ash is much lower than that of cement, which can reduce the project cost. Tibet has special geographical environment and climatic conditions, and generally has the characteristics of “high altitude, low pressure, low temperature, large temperature difference between day and night, and dry climate”. Taking the dam-building environment in central Tibet as an example, through investigation and research and analogy of similar projects, this paper analyzes the adaptability of construction of RCC gravity dams in Tibet from the aspects of geographical environment, climatic conditions, material properties, construction progress, and project cost. Adaptability to high altitudes. It provides a reference for choosing a safe, reliable, economical and reasonable dam type in the construction of water conservancy and hydropower projects. It provides reference for selecting safe, reliable, economical and reasonable dam types in water conservancy and hydropower engineering construction.

The theoretical system of the State Grid energy internet strategy is studied in this paper. This paper combs the scientific connotation of the State Grid energy Internet strategic goal under the dual carbon goal. Combining the policy requirements of state-owned enterprise reform with the requirements of electric power system reform, a systematic and theoretical understanding has emerged. The scientific connotation of the energy Internet strategic system of the State Grid at the current stage is proposed, which provides theoretical support and practical guidance for relevant departments. The result showed that the State Grid energy Internet strategy system formed a complete system, covering all aspects of enterprise development, connecting the foundation, ability, image and achievements of development, and is highly systematic, scientific and adaptable.