bluuebunny/crossref_metadata_2025 huggingface dataset:
Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects
Authors: Wang Weiwang , Yan Xilin , Li Shengtao , Zhang Lina , Ouyang Jun , Ni Xianfeng
Published: January 2021

This study reviews the failure of high‐voltage submarine cables used in offshore power transmission and provides highlights of their failure characteristic, mechanisms, key issues and prospects. High‐voltage submarine cables are designed and applied according to the high‐voltage alternating current and high‐voltage direct current requirements. Inevitably, the fault occurs in HV submarine cables that is different from that of an underground cable. External aggression remains the primary cause of faults, such as fishing and anchors. Most faults continue to occur at a shallow depth (300 m). The optical fiber inside the submarine cables plays a substantial role in the temperature and stress‐strain monitoring and diagnosis. However, it is regarded as a weak point for electrical fault. Insulation breakdown is the leading reason for the short fault. The failure mechanism is complicated when associated with marine conditions. Some defects of insulation and extensive voids, water treeing, mechanical stress, partial discharges, overheating, and electrochemical erosion contribute to the insulation breakdown. Several key issues, including anchoring damage, treeing, defects, and thermal‐electric ageing, are proposed. Prospects and new methods related to the cable failure, especially for insulation ageing by treeing and electrothermal effects, are also discussed.
Protection issues in the presence of power electronic converters in smart LV residential networks
Authors: Amiri Arash , Cross Andrew M.
Published: January 2021

The use of a power electronic converter to step‐down the voltage at the point of connection to individual residential houses is being considered in the UK. This is so that the voltage on the existing low voltage cables can be boosted, which would result in an increase in capacity without the need for costly reinforcement. This capacity increase is needed to accommodate an anticipated take‐up of new, low‐carbon technologies such as electric vehicles and electro‐heat. The inclusion of a power converter and communications device also offers the opportunity for smart‐grid functions such as managing local demand through voltage control. This study considers the design of this converter within the context of wiring regulations and standards that currently apply to a residential property. In particular, it is found that the rating of the converter is determined by the need to co‐ordinate with the existing circuit breaker protection within the house. A protection strategy is therefore proposed for the converter, which is evaluated using a statistical simulation study.
Low star formation efficiency due to turbulent adiabatic compression in the Taffy bridge
Authors: Vollmer B. , Braine J. , Mazzilli-Ciraulo B. , Schneider B.
Published: January 2021

The Taffy system (UGC 12914/15) consists of two massive spiral galaxies that had a head-on collision about 20 Myr ago. It represents an ideal laboratory for studying the reaction of the interstellar medium (ISM) to a high-speed (∼1000 km s−1) gas-gas collision. New sensitive, high-resolution (2.7″ or ∼800 pc) CO(1−0) observations of the Taffy system with the IRAM Plateau de Bure Interferometer (PdBI) are presented. The total CO luminosity of the Taffy system detected with the PdBI is LCO, tot = 4.8 × 109 K km s−1 pc2, 60% of the CO luminosity found with the IRAM 30 m telescope. About 25% of the total interferometric CO luminosity stems from the bridge region. Assuming a Galactic N(H2)/ICO conversion factor for the galactic disks and a third of this value for the bridge gas, about 10% of the molecular gas mass is located in the bridge region. The giant H II region close to UGC 12915 is located at the northern edge of the high-surface-brightness giant molecular cloud association (GMA), which has the highest velocity dispersion among the bridge GMAs. The bridge GMAs are clearly not virialized because of their high velocity dispersion. Three dynamical models are presented and while no single model reproduces all of the observed features, they are all present in at least one of the models. Most of the bridge gas detected in CO does not form stars. We suggest that turbulent adiabatic compression is responsible for the exceptionally high velocity dispersion of the molecular ISM and the suppression of star formation in the Taffy bridge. In this scenario the turbulent velocity dispersion of the largest eddies and turbulent substructures or clouds increase such that giant molecular clouds are no longer in global virial equilibrium. The increase in the virial parameter leads to a decrease in the star formation efficiency. The suppression of star formation caused by turbulent adiabatic compression was implemented in the dynamical simulations and decreased the star formation rate in the bridge region by ∼90%. Most of the low-surface-density, CO-emitting gas will disperse without forming stars but some of the high-density gas will probably collapse and form dense star clusters, such as the luminous H II region close to UGC 12915. We suggest that globular clusters and super star clusters formed and still form through the gravitational collapse of gas previously compressed by turbulent adiabatic compression during galaxy interactions.
Evaluation of desertified delta plant communities using spectral indexes and landscape transformation models
Authors: Reimov Mamanbek , Statov Viktor , Reymov Polat , Mamutov Nizamatdin , Abdireymov Salavat , Khudaybergenov Yakhshimurad , Matchanova Shynar , Orazbaev Aziz
Published: January 2021

The work concerns the application of spectral indexes (NDVI, SAVI and other types of spectral indexes) for monitoring and evaluation of the plant communities of desertified Amudarya river delta plant communities. The described approach includes the multi-level spatial model of the landscape transformation with desertification, soil erosion, soil salinity increasing, climatic changes to improve the adequacy of the remote sensing methods for complicated and non-stable post-deltaic ecosystems of the Aral Sea region. The key role of the geomorphological and pedological analysis for the spatial model implementation had been shown. Some geostatistical techniques had been used to link general data on vegetation cover calculated from remote sensing information with the type of the plant community, with consequent clarification of the vegetation map using both succession-based model approaches and field data.
Research Progress of Cathode Materials for Lithium-ion Batteries
Authors: Lu Kaijia , Zhao Chuanshan , Jiang Yifei
Published: January 2021

Lithium-ion batteries have attracted widespread attention as new energy storage materials, and electrode materials, especially cathode materials, are the main factors affecting the electrochemical performance of lithium-ion batteries, and they also determine the cost of preparing lithium-ion batteries. In recent years, there have been a lot of researches on the selection and modification of cathode materials based on lithium-ion batteries to continuously optimize the electrochemical performance of lithium-ion batteries. This article introduces the research progress of cathode materials for lithium ion batteries, including three types of cathode materials (layer oxide, spinel oxide, polyanionic compound) and three modification methods (doping modification, surface coating modification, nano modification method), and prospects for the future development of lithium ion battery cathode materials.
Evaluation of bearing capacity of reinforced concrete box ribbed arch bridge based on static load test
Authors: He Mao , Fu Xin , Chen Shunchao
Published: January 2021

In order to evaluate the stress and working performance of a reinforced concrete box-ribbed arch bridge after completion, the load test of the bridge is carried out. Static load test is to test the stress and displacement of each section of arch rib under the action of partial load and medium load. Through the experiment with the key parts of the stress (strain) and displacement load and other important data, through analysis and study, the comprehensive analysis of the phenomenon of calculation and test, a comprehensive performance evaluation structure and function whether meet the design requirements, to provide technical basis for the safety of the bridge operation, and provide the original material for the bridge maintenance and management in the future.
Simulation of reactive power regulation of DFIG
Authors: Zhu Yingfeng , Xie Xiaosu , Yang Dong , Gao Song , Zhang Weichao , Yuan Xunkui
Published: January 2021

Doubly fed induction generator (DFIG) wind power generation system is widely used in wind farm all over the world. Reactive power can be generated both in grid-side converter and generator-side converter of DFIG. In this paper, working principle and control method of DFIG are introduced, and the reactive power limit of DFIG is derived, finally reactive power regulation is simulated in Simulink.
Feasibility study on adjustment of injection-production system in extremely high water cut period
Authors: Cao Guoqiang
Published: January 2021

Entering the stage of ultra-high water cut development, affected by faults and irregular well patterns in some areas, there are problems in the development of oilfields such as imperfect injection-production systems, high oil-water wells ratio, low multi-directional connectivity ratio, and complex injection-production relationships. To this end, combined with well seismic and fine reservoir research results, the feasibility study of the injection-production system adjustment was carried out, based on the fine adjustment of the strata well pattern, and through new drilling, supplementary drilling, re-injection, re-production, etc. The well pattern connection rules are conducive to the purpose of adjustment, thereby increasing the recovery rate and improving the effect of oilfield development.
Review on antibiotics treatment by electrochemical membrane reactor
Authors: Chao Lei , Chen Feilong , Han Yi , Li Yafeng
Published: January 2021

Lower consumption, higher efficiency, environmental protection, and reliability are the development trends for the treatment of antibiotic wastewater in future. To accomplish this, the electrochemical membrane reactor (ECMR) is developed by combining membrane filtration and electrochemical advanced oxidation technology. The device configuration and working mode of the electrochemical membrane reactor are introduced and compared. Besides, the principles of the removal of antibiotics by the reactor are explained with emphasis. Furthermore, the commonly used cathode and anode materials of the reactor in the current research are summarized, and the electrode materials are discussed. The effects of selection and modification on the elimination of antibiotics in the reactor and the impact are analysed. To address the limitations of electrochemical membrane reactors, this review proposes that more research should be done in the aspects of antibiotic degradation mechanism, reduction of membrane electrode R&D costs, and actual application of amplification devices.
Preliminary Study on Application Scope of New Ore Pulverizing Technology
Authors: Geng- Hao Zhang , Chun Feng , Yong-Bo Fan , Shi-Hai Li
Published: January 2021

New ore pulverizing technology was proposed by the Institute of mechanics, Chinese Academy of Sciences. In order to study the applicability of the new ore pulverizing technology to different materials, several experiments were carried out. In this paper, the author used the new ore pulverizing technology to pulverize iron ore, kaolin, wood and PVC, and finds that the new ore pulverizing technology has good application for iron ore, kaolin wood but for PVC. The experimental results show the application scope of the new ore pulverizing technology.
Development status and prospect of new energy technology
Authors: Zhang Mingzhu , Li Xiaojing
Published: January 2021

In the current severe situation of continuous shortage of energy resources, the global energy structure is undergoing profound changes. New energy is the main direction of the energy transformation, and the iterative innovation of new energy technology is an important means to promote the transformation of the global energy industry. From the perspective of new energy technology, this paper mainly introduces wind power generation technology and photovoltaic power generation technology. Firstly, the basic principles of wind power and photovoltaic power generation technology are described; Secondly, it counts the current status of the global wind power and photovoltaic market in 2019 and the change trend of installed capacity during 2001-2019, further analyze the development status of these two new energy technologies; finally, it summarizes the development status of new energy technology and makes a prospect for its future development.
Research on Promotion of Consumers’ Application of After Service in Online Shopping Based on Evolutionary Game Theory-- Introduction of Smart Contract
Authors: Lei Hongzhen , Lu Di , Zhang HongHong
Published: January 2021

In order to research how to promote online shopping consumers’ application of after service, build an evolutionary game model of both consumers and e-stores. This paper introduces the variables of supervision and punishment, tries to introduce the smart contract as a powerful service guarantee, and analyzes the influence relationship of variables between the two players and their strategic choices. This paper analyzes the ESS of the system when the relationship among smart contract, revenue, supervision and punishment meets 8 different conditions. Finally, giving suggestions to optimize the after service in online shopping according to the results.
Research on corrosion mechanism of overhead conductor
Authors: Zheng Wei , Li Xizhong , Xu Zhongkai , Jin Zhuochen , Liu Yang
Published: January 2021

During the operation of overhead conductors, conductors are corroded to varying degrees by the smoke and dust, harmful gases from factories around the lines, or in corrosive salt fog atmosphere in coastal and island areas, as well as humid and hot weather conditions. In this paper, through the study of the corrosion mechanism of the conductor, the types of the corrosion are analyzed, and the factors leading to the corrosion and the corrosion process are analyzed by selecting the steel cored aluminum stranded wire, so as to provide theoretical basis for the development of anti-corrosion wire and the judgment of corrosion detection.
Research on Targeted Acidizing Technology in Long Horizontal Section of Carbonate Reservoir
Authors: Wang Chao , Long Changjun , Zhang Jianli , Xiao Jie , Xu Zhengdong , Yan Feng
Published: January 2021

The upper layer of Oil field A is developed by horizontal linear well pattern with long well segment. After completion, there is relatively serious formation damage, and the tested epidermal factor is up to 6.21 on average. Due to the length of horizontal well section and the serious vertical heterogeneity of formation, some strata were over-acidized in the early stage, so it was very difficult to distribute acid evenly. For this reason, the low contribution layer of horizontal section was determined by using amino carboxylic acid system and coiled tubing hydrojet acidification process, combined with reservoir characteristics, and the spindle-type acid distribution method was adopted to optimize nozzle combination parameters to predict construction displacement and ground construction pressure. The laboratory experiment was carried out to compare with the conventional acid system for core displacement experiment. The acid could form acid-etch wormhole, effectively extend the acid-action distance, and achieve the purpose of slow and deep penetration.
Empirical Research on the effectiveness of national pilot carbon trading market based on carbon price time series
Authors: Ruoyu Ning , Yisheng Liu
Published: January 2021

We will promote the establishment of a unified national carbon market, effectively control and gradually reduce carbon emissions, and contribute to the reduction of carbon emissions, it is of great significance to promote the economic transformation to green and low-carbon. Based on the time series of carbon price, this paper conducts exploratory research on the effectiveness of the carbon trading market in eight pilot regions, uses the fractal market hypothesis, adopts the re-rating difference analysis method, takes the effective carbon price of each pilot every day as the research variable, and empirically analyzes the effectiveness of the pilot carbon market.
Design of the monitoring system for the internal state characteristic parameters of ultra-high voltage metal oxide arresters
Authors: Geng Lina , Ma Yiling , Lu Xuchen , Wang Yanan
Published: January 2021

At present, UHV surge arresters have a large number of sections and complex structures. The existing live detection and online monitoring technologies can no longer effectively determine the problem of deterioration of the internal resistance of the arrester. This paper studies the structure, power supply, temperature and humidity measurement and wireless transmission methods of measuring probes that can be placed in the arrester for a long time. By measuring the temperature, humidity and current data of each node, and sending it to the background wirelessly, it is more effective to judge the UHV Internal defects of the arrester. The method of internally measuring the temperature and humidity of the arrester node can improve the diagnostic ability of the internal defect and defect location of the UHV arrester, and realize the effective identification and location of the internal fault of the UHV arrester.
Analysis of Machine-made Sand Parameters in Shaanxi
Authors: Chen Zhangjun , Yu Kangjian , Miao Donghui , Ke Yuliang , Liu Bobo
Published: January 2021

Machine-made sand was significantly different from natural sand in terms of particle gradation, morphology, composition and structure. The concrete composed of mechanical sand and natural sand was greatly influenced by the physical and chemical properties of sand and gravel in terms of its microscopic appearance and macroscopic properties. Therefore, this paper aimed to systematically analyze the big data of machine-made sand performance testing, and focus on the fluctuation of the fineness modulus, stone powder content, and other indicators of machine-made sand particles in various regions of Shaanxi, and solve measures were further discussed.
Application of color temperature controllability in LED lighting environment of highway tunnel
Authors: Liu Zhiqiang , Li Peifeng , Jiang Haifeng , Wang Dan
Published: January 2021

In recent years, tunnel LED lighting has been widely used in tunnel lighting engineering because of its advantages such as fast start, low energy consumption and good light color controllability. However, at present, the tunnel LED lighting mostly adopts the single dimming control function of light brightness, which does not give full play to the technical advantages of the tunnel LED lighting with two indicators of light brightness and light color temperature control, and does not consider the influence of the color temperature and spectral distribution of the LED light source on the safety and comfort of the tunnel LED lighting environment. Therefore, this paper studies the relationship between the color temperature of tunnel LED lighting source and the visual comfort and visual recognition distance, analyzes the actual impact of the color temperature of LED light source on the tunnel lighting light environment, and puts forward the color temperature index applicable to the entrance and exit sections of tunnel LED lighting, which provides a theoretical basis for building a safe and comfortable "two types" tunnel LED lighting light environment.
The application of compaction device for highway structural layer in the road construction of Yun-Mao Highway
Authors: He Boqian , Lou Jian
Published: January 2021

The compaction device for highway structural layer is the hinge connection of the end of the hydraulic breaker rod of a conventional excavator and the base of a compaction device. During operation, the steel panel of the compaction device is positioned on top of the construction area, which is then compacted by controlling the hydraulic breaker of the excavator. This device can quickly and effectively solve the common quality issues such as the insufficient compactness of the earth shoulder in highway construction projects.
Effects of salt stress on the physiological characteristics of Solanum photeinocarpum
Authors: Liao Renyan , Xu Yinsong
Published: January 2021

A pot experiment was used to study the effects of different concentrations of salt (100, 200, 300 mmol/L) stress on the photosynthetic physiology and antioxidant enzyme activities of Solanum photeinocarpum. The results showed that NaCl of 100 and 200 mmol/L could significantly improve the contents of chlorophyll a, chlorophyll b and carotenoid in S. photeinocarpum. However, under different concentrations of salt stress, there was no significant difference in the amount of total chlorophyll in S. photeinocarpum. Besides, as the salt stress increased, the net photosynthetic rate, stomatal conductance, CO2 concentration of intercellular and transpiration rate of S. photeinocarpum gradually decreased, when the concentration of NaCl was 300 mmol/L, reached the lowest value. With the increase of salt stress, the POD activity, CAT activity and soluble sugar content of S. photeinocarpum increased first and then decreased, reaching the highest when the concentration of NaCl was 100 mmol/L. Therefore, S. photeinocarpum had a certain salt tolerance, low concentration of NaCl (≤ 200 mmol/L) stress could promote its growth, but high concentration (> 200 mmol/L) could inhibit its growth.
Research on the renovation of Longtan Village in Guizhou Province based on spatial syntax
Authors: Xu Yang , Yuan Ben , Zhang Hui
Published: January 2021

With the gradual deepening of National Rural Revitalization Strategy, investment, tourism of traditional natural villages has become a hot spot in recent years. Taking the traditional village renewal of the Longtan Village in Guizhou Province as an example, this paper uses the space syntax theory and method to establish axis model and horizon model by using Depthmap software to analyze the integration value, depth values, connection value and line of sight integration degree of Longtan Village street space, and to explore the method of scientifically and quantitatively guiding the project renewal and reshaping the vitality of traditional village street space.
Thoughts on Green Highway Construction in Qinghai-Tibet Plateau
Authors: Ge Liyan , Feng Zhiqiang , Yao Haibo , Liu Siwei
Published: January 2021

On the basis of combining the unique characteristics of the natural environment and the fragile and sensitive ecological environment in the high-cold and high-altitude areas, the difficulties and challenges in the construction of green roads in the Qinghai-Tibet Plateau are analyzed, and the construction of green roads in the Qinghai-Tibet Plateau should have its own unique characteristics. Relevant technologies and eco-environmental protection measures for green road construction in high-cold and high-altitude areas, and specific suggestions for green road construction on the Qinghai-Tibet Plateau, aim to provide certain ideas for the construction of green roads on the Qinghai-Tibet Plateau for reference.
Removal of 1,4-Dioxane from Wastewater by Copper Oxide Catalyzed WAO with Mild Condition
Authors: Wang Quyuan , He Runtian , Xu Jing , Jin Fangming
Published: January 2021

1,4-Dioxane is a contaminant of emerging concern that is classified by the U.S. Environmental Protection Agency as a likely human carcinogen. Moreover, 1,4-dioxane easily migrates to groundwater due to its high solubility in water and hard to be biodegraded or removed by traditional water treatment technology. Therefore, it is indispensable to develop new methods and technologies to dispose of 1,4-dioxane in the wastewater. Herein, this study presented catalytic wet air oxidation (CWAO) with CuO as a catalyst and O2 as an oxidant to treat 1,4-dioxane and investigated the influence of reaction conditions, including temperature, reaction time, oxygen content, catalyst addition and pH, on the degradation of 1,4-dioxane. The highest degradation rate (R) of 1,4-dioxane was 95.8 % when the optimal reaction conditions were at 200 °C and 1 MPa O2 for 60 min with 5 mmol CuO added. If the effect of Cu2+ dissolution was not considered, the R of 1,4-dioxane is up to 99.8 % was achieved at an acidic condition (pH=3) with 2 mmol CuO added.
Retrospect and Prospect of Heating Methods and Biomass Technology in Northern China’s Rural Areas
Authors: Chen Lingxuan , Zhang Yan , He Runhua , Liu Lifanxing , Zhang Tianfeng
Published: January 2021

Heating methods adopted in Northern China’s rural areas show characteristics of diversity, low heat efficiency, bringing environmental pollution and so on. Meanwhile, with harvest in rural areas, there has been a problem of a large amount of accumulated waste straws which can be used as biomass energy, a source of clean energy and also green energy of the 21st century given its fraction of harmful components such as sulfur, nitrogen and heavy metals.
Discussion on current situation of green service area construction
Authors: Jian Li , Yao Jialin , Meng Xin , Yang Yangang , Guan Lei
Published: January 2021

In the current period when the highway industry is accelerating the improvement of infrastructure construction and implementing new development concepts, the construction of green service area is an important part of promoting the high-quality development of highway transportation infrastructure. Based on the study of the connotation of the green service area, in order to provide experience and reference for its construction and transformation, this article put forward the content of the construction of green service area, and further combined the comprehensive survey of service areas of a certain province in central China, analysed and summarized current situation of green construction technologies from aspects of location and land use, buildings, environmental protection facilities, and renewable energy utilization.
Design Practice of Tourist Road Based on Rural Revitalization-Taking Jinan S103 Tourist Highway as an Example
Authors: Wei-gang Wang , Ming Xu , Jian Zhou , Qi Wang
Published: January 2021

Combining with the design practice of Jinan S103 tourist road, analyzing the design principles of tourist road and the difficulty of project implementation, the author proposes to build five major systems of tourist road to promote tourist road construction.
Body Temperature Detection and Data Collection during COVID-19
Authors: Yu Wenhong , Luo Chenlu , Wang Kuan
Published: January 2021

At present, COVID-19 is raging in many countries, which poses a great threat to people's life, health, social and economic development. Body temperature screening is very helpful for early detection of potential infected persons and blocking the spread of the epidemic. The paper mainly introduces the body temperature detection and data acquisition system, and designs a system with the function of non-contact temperature measurement and automatic data collection system. This system is suitable for the company or school where the flow of people is large and the temperature needs to be measured quickly, and upload information in real time.
Research on Innovative Strategies of Accurate Development Model of Regional Agricultural Economy under Big Data Coordination
Authors: Li Bin , Yang Ni
Published: January 2021

This article will analyze the correlation between big data and regional agricultural economic development on the basis of fully understanding the connotation and characteristics of big data technology. Then, we should use its concept and related technologies and operating models to realize the precise operation guidance of multiple links such as agricultural product planting, selection, planting, farm management, harvesting and storage, and marketing. Through the integration of big data and local advantageous agricultural resources, it is possible to build a fusion and innovation mechanism based on big data, and build an open, intelligent, and intensive precision agriculture development format. This can accelerate the realization of agricultural informatization and modernization, and promote the innovative development of regional agricultural economy.
The Effectiveness of Chinese Monetary Policy during the 2008 Financial Crisis
Authors: Li Yiming
Published: January 2021

The objective of this paper is to explain the factors that led to the effectiveness of Chinese monetary policies during the financial crisis. As the crisis hit China, China’s economy faced two external shocks in the investment and export sector. The reliance on the international market, together with its constrained monetary policy and institutional problems, make it worthwhile to consider why China was the first country that recovered from the financial crisis. Through the analysis, the paper identifies three sources of the efficiency. The first concerns with the previous economic health. The second involves the well-coordinated fiscal and monetary policies and the last derives from China’s institutional characteristics. Moreover, it is argued that some policies made during the financial crisis may carry risks and other negative implications in the long run. The paper focuses on two of them, namely the implications on the real estate market and economic restructuring.
Economic Power Comparison between United States and China in the Context of Covid-19 Pandemic: Based on Statistical Methods
Authors: Yang Yutong
Published: January 2021

Generally speaking, economic crises are caused by insufficient demand, while the economic crisis that may be caused by the Covid-19 epidemic started with insufficient supply. In the case of insufficient demand, countries often use a series of monetary policies to release liquidity, such as interest rate cuts, RRR cuts. However, the interest rate cut this time may not work well. This is because the interest rate cut can increase the liquidity of the market.

While controlling the epidemic, we should promptly resume work and production, and produce a variety of commodities that meet consumer demand. During this period of time, the main strategy is not monetary policy. Instead, appropriate fiscal policies should be used to reduce the burden on enterprises so that they can survive this difficult time without dying before they start their careers. Only companies that can survive the epidemic are good companies that have combat effectiveness and can continue to conquer the market after the epidemic is over.

Therefore, in the face of the Covid-19 epidemic, the competition between China and the United States should not be a zero-sum game because the United States is the final consumer of a large number of products produced by China, and the United States is still the world’s leader. If the US economy declines, it will definitely affect global economic development. When necessary, we also need to support the production of high-end consumer products in the United States and allocate a portion of the production capacity for them. Only when the two sides have healthy competition can the industrial chain of both sides be upgraded together.
Empirical Study on the Influence of Cultural Distance and Board Capital on the Performance of Foreign Direct Investment of Beijing’s Cultural and Creative Enterprises
Authors: Fang Gang , Wang Shan
Published: January 2021

Based on the background that China enterprises are becoming more and more active in capital operation in the international scope, this paper selects 14 cultural and creative enterprises in Beijing as the research objects, and analyzes the relationship between cultural distance, geographical distance, capital elements of the board of directors and enterprises' FDI performance. This paper crawled data from the stock exchange and other websites, and further used SPSS data processing software to model and analyze the data obtained, and obtained the empirical research results as follows. The empirical results showed that cultural distance and geographical distance were significantly negatively correlated with FDI performance, which was consistent with the original research hypothesis of the paper. And among the capital factors of the board of directors, the gender diversity, education level, scale and internationalization degree of the board are significantly positively correlated with FDI performance. Finally, the corresponding conclusions and Suggestions are put forward according to the empirical analysis results.
Analysis of Enterprise Profitability Based on Dupont Analysis Method -Taking China Life Insurance (Group) Company as an Example
Authors: Li Ding
Published: January 2021

Obtaining profits is the main purpose of enterprise development, and profitability is the core indicator for measuring the development status and prospects of enterprises. DuPont analysis method is a comprehensive and effective financial analysis method to evaluate the profitability of enterprises. This article will focus on DuPont analysis method, supplemented by factor analysis method and comparative analysis method to comprehensively analyze the profitability of China Life Insurance Co., Ltd. Analyze the advantages and disadvantages of its profitability, then, give some relevant reasonable suggestions.
Application of artificial neural networks in the design of biomedical materials
Authors: Chen Yu
Published: January 2021

Biomedical science is a scientific field that includes the intersection of multiple technologies, combining the theoretical methods of biology, medicine and engineering. Biomedical materials are now a branch of the body that studies materials that are adapted to the body’s functioning to ensure normal human activity. Because of its closely related to human activities, it has become an important research field in our time. Therefore, the purpose of this paper is to explore the application of artificial intelligence in the design of biological science materials. Therefore, in the case of using high-quality materials, the material design is improved and optimized by using artificial neural networks under the basis of adverse rejection reactions to the properties of raw materials. The experimental results show that artificial neural network can be better connected and reaction, which is beneficial to improve sensitivity and use emergency measures to deal with it.
CRISPR/Cas9-based genome engineering in HIV gene therapy
Authors: Tang Xuanting
Published: January 2021

In recent years, the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated nuclease (Cas) technology has become the most heated genome editing technique. Comparing to earlier genetic engineering methods, the CRISPR/Cas system is more advantageous due to its simple convenient design, high efficiency, cost-effectiveness, and the ability to perform multi-sites editing simultaneously. As the most effective gene editing tool, it utilizes a simple short RNA-guided mechanism to direct Cas-mediated DNA cleavage at the target genome locus and exploits the endogenous DNA repair pathways to achieve site-specific gene modifications. Initially discovered as a part of the bacterial adaptive immune system, the CRISPR/Cas system has now been widely used to study a broad range of biological genomes. Besides its contribution to our understanding of the basic genetic science, the application of the CRISPR/Cas system also expands rapidly into the medical fields, showing great potentials in the research of genetic diseases, viral infectious diseases, and cancers. In this review, the latest research progress of CRISPR/Cas technology is summarized based on its development, mechanism, and application in HIV/AIDS intervention. This review also examines the existing weaknesses and the future prospects of this promising technology.
Research of landfill leachate treatment based on anammox
Authors: Wu Denghua
Published: January 2021

Landfill leachate has the characteristics of high ammonia nitrogen content, high concentration of organic matter and low carbon nitrogen ratio. Traditional biological treatment technology is difficult to meet the increasingly stringent emission standards. Ammonia nitrogen is the main pollutant in landfill leachate. The ammonia-nitrogen-rich leachate not only poses a threat to the surrounding environment, but also has adverse effects on the subsequent biological treatment of leachate. Anaerobic ammonium oxidation (Anammox) is a new biological denitrification technology, which has the advantages of high denitrification capacity and low energy consumption, and is suitable for the treatment of landfill leachate. This article from the process type, inhibiting factors and microbiology at home and abroad are reviewed in three aspects: the anaerobic ammonia oxidation treatment, the research progress of landfill leachate by analyzing the national environmental protection agency of leachate quality related data in the database, and combining previous research results, reveals the infiltration drain liquid ammonia nitrogen in the different conditions of concentration variation characteristics, for anaerobic ammonia oxidation treatment of landfill leachate to provide the reference for engineering applications.
Study on the application of accountability nursing in cardiology department
Authors: Qi Chenglei , Jiang Fang
Published: January 2021

With the progress of medical technology, the treatment ability of central vascular diseases in hospitals is getting stronger and stronger, which improves patients’ confidence in the treatment of diseases. In the department of cardiovascular medicine, in order to improve the effect of treatment and improve patients’ satisfaction with medical services, bedside responsibility system nursing can be adopted for patients during the treatment process, which can effectively improve the quality and effect of nursing in the department of cardiovascular medicine and speed up the recovery of patients. This article narrated what is department of cardiovascular medicine, still elaborated the nursing method of bedside responsibility system in department of cardiovascular medicine and application effect.
A preliminary study on the synthetic lethal effect of berberine and olaparib on pancreatic cancer cells and its mechanism
Authors: Zhang Chengyong , Yang Tingting , Chen Xiaoting , Xu Jiexuan , Liang Danlu , Yi Huairu , Chen Size , Huang Lanlan , Liu Naihua , Lin Shaoqiang
Published: January 2021

Pancreatic cancer is a kind of malignant tumor with high mortality rate. Early operation and late chemoradiotherapy are the treatment criteria, but the prognosis is still poor. Berberine, an alkaloid compound present in many herbal plants, is capable of inducing oxidative DNA damage and downregulating homologous recombination repair (HRR) in cancer cells. Poly (ADP ribose) polymerase-1 (PARP-1) is a sensor of DNA damage with key roles in DNA repair. In this study, we demonstrated that berberine and PARP inhibitor olaparib have a synthetic lethal effect on pancreatic cancer cells. The expression level of RAD51 were reduced by berberine. Correspondingly, PARP became hyperactivated in response to berberine treatment. When berberine is combined with olaparib, the expression of Rad51 and Parp are inhibited. The combination of berberine and olaparib synergistically inhibit cell activity and induce cell apoptosis. In addition, the synergistic effect of berberine and olaparib can be reversed by apoptosis inhibitor and necrosis inhibitor. Together, the results indicate that berberine combined with olaparib have a synthetic lethal effect on pancreatic cancer cells.
Oxidative intermediates captured during demethylation of DNA and RNA
Authors: Wang Ying , Zhang Jianyu
Published: January 2021

DNA and RNA have various methylation modifications or damage that are directly related to some human diseases and physiological regulation. Most of these methylation modifications are reversible and can be dynamically repaired by RNA or DNA demethylases. Over the past few decades, enzymes from the ALKB and TET families have been shown to have the ability to demethylate nucleic acids, which involves intermediates in the oxidative repair process. These intermediates can be accurately captured by advanced methods such as HPLC, LC-MS, TLC, and crystallization, which can significantly promote our understanding of the dynamic mechanism of demethylation. In this review, we discuss recent research advances in this area and raise open questions and constructive opinions about the capture of nucleic acid demethylation intermediates.
Determination of 12 acrylate compounds in plastic food contact materials via high performance liquid chromatography
Authors: Qiu Yue , Zhang Qing , Li Genrong , Long Mei , Xiang Dong
Published: January 2021

A high performance liquid chromatography (HPLC) method was used to determine 12 acrylate compounds in plastic food contact materials. The plastic food contact material samples were extracted by ultrasonic with methanol. The mixed solution of water and acetonitrile was used as mobile phase for gradient elution. The samples were separated by ZORBAX SB-AQ column (250 mm×4.6 mm, 5 μm), and analyzed by diode array detector (DAD). The results showed that under the optimal chromatographic conditions, the 12 acrylate compounds had good linear relationships in the range of 0.01-10.0 mg/L, the correlation coefficient of the standard curves were higher than 0.999, and the detection limits (LODs) were 0.03-0.08 mg/kg. The recovery rate was between 85.4% and 110.7%, and the relative standard deviation was from 1.6% to 5.2%. The method was simple and accurate, and can be used for the analysis and detection of 12 acrylate compounds in plastic food contact materials.
Research on Cracking Control of Immersed Tube Tunnels Concrete by Pre-heating treatment
Authors: Yu Fang , Deng Chunlin , Sheng Zhibo , Wang Kangchen , Song Shenyou
Published: January 2021

Herein, the pre-heating treatments are researched. With diversity of zone and temperature, highest average temperature of the section 10cm below surface was 14.7°C, which is lower than that of the concrete block. And the distance of 20cm and 40cm to surface of section, the temperature is 11.8°C and 9.8°C， respectively. When the heating water of 60°C, the increase of 48h to 72h, the highest temperature is about 47.2°C and 49.6°C.
Application and Analysis of Curtain Grouting in Seepage Prevention and Reinforcement of Masonry Dam
Authors: Huiqin Yao , Dongmei Liu , Chaofu Peng
Published: January 2021

At present, the number of masonry dam in China is still relatively large. Due to various reasons, many of the dam body appears aging, degradation and other phenomena, and leakage is one of the common problems. Now grouting technology is the main technical means of anti-seepage treatment. Curtain grouting technology has wide adaptability to strata. With the gradual improvement of grouting technology, it has been widely applied in engineering and water conservancy projects. In order to ensure the safety of the dam and improve the grouting effect, this paper summarizes the rules of anti-seepage treatment based on the actual grouting treatment methods, and provides technical guidance for the anti-seepage treatment of other similar masonry dams.
Study on Frost Heave Evaluation System of Large Canal Foundation Soil in Cold Area
Authors: Ma Dong-He , Tan Chun , Wang Ye-Ting , He Ta-Na , Wang Yan-Long
Published: January 2021

Frost heave of canal foundation soil is the main factor of destroying canal system engineering in the cold area. Restricted by technical and economic conditions, further evaluation of the frost heaving index and system of the large channel in cold areas where needed. Based on the field investigation and relevant evaluation methods, several evaluation indexes such as water content, compaction coefficient, fine grain content, and cumulative negative surface gas temperature, the direction of canal slope are selected. Combined with the observation results of the prototype test field for many years, the frost heave degree of large channel foundation soil was comprehensively evaluated. The purpose of this paper is to standardize the evaluation method of frost heave characteristics of canal foundation soil in cold region, which has important guiding significance for the prevention and control of road frost damage in the cold region.
“Double Evaluation”-the prerequisite and foundation of the municipal-level land and space master plan
Authors: Xiangyanan  , gaohuanggen  , xiataiyun  , wanglimeng  , lizongyi  , wangju  , liaojingqian  , luojingru
Published: January 2021

Resources and environment carrying capacity and space development land suitability assessment (after referred to as “double evaluation”) is to recognize the location of natural resources and land space development short board, Highlight the important prerequisites and foundations for the governance and problem orientation of land and space planning in the new era, Played an important role in co-ordinate the three types of layout space to find out the natural resources[1-3], to identify the type of risk, determine the bearing cap and scientific delineation of three control lines, At the same time, it also provides an important starting point for the implementation of monitoring, evaluation and early warning of land and space planning. In order to better support the preparation of land and space planning in the new era, it is necessary to re-examine and re-understand the “double evaluation” work of municipal land and space planning. This article starts with the “Guidelines for the Compilation of Municipal-level Territorial and Spatial Master Plan (Trial)” (hereinafter referred to as “Guide”) for the work requirements of “double evaluation”, through combing and summarizing the existing problems and important difficulties in actual work, from logical transformation and technical mining The “double evaluation” work is summarized and explored from a dual perspective, in order to provide a reference for the preparation of the municipal-level land and space master plan.
Research on the settlement of levee and the formation mechanism of pavement crack in heightening and thickening levee engineering
Authors: Ma Donghe , Tan Chun , Liu Xin , Wang Peng , Han Songling
Published: January 2021

In view of the heightening and thickening levee project which already built, the settlement and deformation on the top of the landside slope of levee and the cracks on the levee were investigated. The finite element method was used to simulated the settlement of the levee. The results show that after heightening and thickening, the thickness of the new filled soil is uneven in the cross-sectional direction of the levee, resulting in a significant difference in the distribution of additional stress and settlement. In addition, the top of the original levee has smaller deformation, while the newly filled levee has larger deformation, which causes uneven settlement on the top of the embankment. The presented results have guiding significance for the settlement and deformation prevention of levee project.