bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation on Exergy in The Process of Heat Exchanger Defrosting
Authors: Dong Wei , Li Yongcun
Published: July 2020

Excellent thermodynamics performance of heat exchangers plays a vital role in the effective operation of the air source heat pump (ASHP). However, the growing process of frost on the surfaces of the heat exchanger in winter could always affect the thermodynamic performance of the heat exchanger, which has attracted a great deal of attention over the past years. Moreover, the exergy analysis based on the second law of thermodynamics of the heat exchangers in the frosting condition has not been investigated before. In the present paper, exergy analysis of air-side heat exchanger was experimentally investigated. The experimental results show that exergy destruction would reach the minimum. The system has the lowest peak of energy utilization. This study is particularly useful for the design of optimal defrosting condition for heat exchangers of ASHP in winter.
Design and Research of 10KV Electronic Transformer Live Performance Evaluation Platform
Authors: Wang Yongchao , Zhang Wei , Li Na , Zhang Jiahai , Wang Guixian , Su Linhao , Gao Xinhang
Published: July 2020

Design and research a test platform suitable for 10KV electronic voltage transformer and 10KV electronic current transformer for long-term charging performance evaluation. The 10KV electronic transformer live test platform includes a primary boost device, a primary current boost device, a reference voltage transformer, a reference current transformer, a standard voltage transformer and a standard current transformer. The test circuit is designed to be three-phase. Under the condition that the system input voltage is 380V / 220V and the total input capacity is not greater than 100KVA, the auxiliary transformer and other auxiliary equipment are used to achieve long-term live operation and performance evaluation of the 10KV electronic transformer.
Application of acoustic emission technology in hydraulic pressure test of nuclear power plant
Authors: Zhang Zhenguo , Feng Huixing , Zhao Weihua , Li Maochao
Published: July 2020

Combined with the technical characteristics of hydraulic pressure test and acoustic emission technology in nuclear power station, this paper discusses the application status and technical features of acoustic emission technology in primary circuit hydraulic pressure test, vessel hydraulic pressure test, boundary valve leak detection of hydraulic pressure test and pipeline hydraulic pressure test in detail, and this paper also looks forward to the application prospect of acoustic emission technology in the field of hydraulic pressure test in nuclear power station.
Study on Operation of hybrid Wind-PV-ES power system In East China
Authors: Xu Lingjun , Zhong Na , Sang Da , Li Gang , Zhang Xiaohu
Published: July 2020

The rapid development of wind power and photovoltaic power in East China has gradually eroded the margin of safe operation of the power grid in recent years. A Wind-PV-ES power system evaluation model is established in this paper, It simulates the production process of Wind-PV-ES power system, and the reasonable capacity ratio of scenery of Wind and PV, the reasonable matching plan and coordinated operation of Wind-PV-ES were carried out. This model effectively evaluates the impact and benefits of Wind-PV-ES power system In East China. The ultimate aim is to provide references for future energy structure adjustment in East China.
Research on Application of Building Energy Saving and Emission Reduction Technology in Civil Engineering
Authors: Zhou Lili
Published: July 2020

In the context of energy saving and emission reduction concepts, the construction industry can effectively reuse the demolished waste building materials, which can promote the protection of China’s ecological environment, avoid the waste of construction resources and energy, and achieve global warming to reduce emissions, Energy saving and low consumption make a significant contribution, which can promote the improvement of China’s economic efficiency. Therefore, energy-saving and emission-reducing measures should be applied in civil engineering construction to promote green and sustainable development of civil engineering construction.
Design of Power Ripple Detection System for Carrier Module of Electric Energy Meter
Authors: Ou Xin , Wang Yiqun , Sun Hang , Hao Fengzhu , Han Peng , Pan Yi
Published: July 2020

DC power supply is usually obtained by rectification, filtering, voltage stabilization and other processes of municipal electricity. Due to the incomplete rectification or the existence of switching power supply, the output DC stability is superimposed with AC components, called ripple. The generation of ripple will bring noise, reduce the efficiency of power supply and affect the normal operation of the system. Strong ripple will cause the generation of surge voltage or current, and burn down electrical appliances and other equipment. This paper designs a detection device which can quickly and efficiently detect the ripple of carrier power supply. The experimental results show that the design system can help testers quickly judge whether the ripple of carrier module power supply meets the ripple voltage limit stipulated by Southern Power Grid Corporation, and is used to detect the ripple of power supply. Testing provides a new method of implementation.
Research on thermal load classification and safeguard implementation
Authors: Zheng Yeqiu , Li Qifen , Li Huayue , Yang Yongwen
Published: July 2020

Under the current economic development, the contradiction between the shortage of energy and the increasing energy demand of the society becomes more and more prominent, which brings great hidden danger to the energy security of our country. In order to reduce the loss caused by the interruption of power supply, energy management measures corresponding to the importance of user load need to be developed. However, the existing load classification system only involves electric power and does not clearly distinguish the importance of thermal and cooling loads, making it difficult to guarantee the safety of power supply of important cooling and thermal loads in emergency situations. With reference to the principle of classified safeguard of electric load, this paper proposed the idea of thermal load classification with the analysis of the personal injury, economic loss and political significance. It provides important ideas and methods for the construction of comprehensive classification and classification of energy and complete standard system of energy security.
The Method of Improving the Performance of Network Analysis Application for the Whole Power Grid
Authors: He Ming , Lu Yi , Li Jing , Zhang Guofang , Guo Guo
Published: July 2020

With the rapid development of UHV AC / DC hybrid power grid, it is required that the Network Analysis Application have the ability of unified analysis and high-performance computing. In this paper, the time-consuming analysis of each sub-function of Network Analysis Application is carried out to realize the performance bottleneck analysis of the whole process of network analysis. It is proposed that the performance of network analysis should be improved in three aspects: data input and output, topology analysis and core computing of Network Analysis Application. In the aspect of data input, the grid model data service is constructed to realize the combination of measurement reading and model reading, and the parallel model verification and boundary equivalence are completed; In the aspect of data output, it can be parallelized by table, block and equipment; In the aspect of topology analysis, the shared memory programming model OpenMP is adopted, and based on the fork/join parallel mode, its parallelization is realized; In the aspect of core computing, the existing parallel computing methods are summarized, and through the actual power grid simulation analysis, it puts forward the parallel computing mode applicable to different scale power grids and different applications. Finally, the effectiveness of this method is verified by comparing the optimized performance of state estimation.
Application of Ultrasonic Technology in Flow Measurement System in Irrigation District
Authors: Liu Qing , Feng Simin
Published: July 2020

Irrigation area measurement of water volume is to optimize irrigation area water use scheduling, and is the key to realizing irrigation area total water control and irrigation water quota management. In order to improve the management level of irrigation districts, speed up the construction of current irrigation districts, and gradually realize digital irrigation districts, it is imperative to transform the automatic construction of water measurement and water measurement in irrigation districts. This project takes the Erba Main Canal of Fenhe Irrigation District in Shanxi Province as the research site. The ultrasonic equipment installed on the irrigation open channel is used to study the measurement of the non-uniform flow of the open channel. According to the cross-sectional area obtained by the water level, the flow rate is calculated.
Research on Applications of An Improved Current Type Push-pull Full bridge bidirectional DC-DC Topology in UPS
Authors: Zhang Peng , Ren Xiuying , Lan Sen , Zhang Dewen , Zhang Hongda , Wang Yue , Shen Yubo
Published: July 2020

Uninterruptible power supply (UPS) boasts the superiority of fast dynamic response and clean output power, which can ensure the stable operation of the system and the safety and reliability of data. Currently, it takes up a large proportion in the backup power market and is extensively applied in key industries such as energy and the Internet. UPS is connected between commercial power and power load, and furnishes uninterrupted, reliable and high-quality power to vital loads when the input power fails. Bi-directional DC-DC converter can realize bi-directional flow of energy, which is functionally equivalent to two uni-directional DC-DC converters, rendering the system to carry the advantages of high power density and low cost, which has become a research focus at home and abroad in the passing years. The traditional current-mode push-pull full bridge topology fails to realize the soft start of the on-line UPS and stable operation of it under empty and light load. Based on this topology, the inductor secondary coil and two freewheeling diodes are added to make the push-pull tube work in any duty ratio state, thus meeting the design requirements of the bi-directional DC-DC converter in UPS. The working principle of the improved topology is described in this thesis, and Saber and Matlab are used for simulation analysis. Prototype is made and debugged to verify the feasibility of the design so as to achieve the expected design goals.
Analysis on the Problem of Blocking of the Storage Pump Caused by Peak Load Regulation of the Unit
Authors: Liu Ke , Wang Haichao , Liu Jinglong , Cui Fuxing , Duan Chuanjun , Zhang Xudong
Published: July 2020

A unit frequently participated in the deep peak load regulation of the power grid. In the process of deep peak load regulation, the time of oil feeding and stabilization of combustion was relatively long, which caused the blocking of the pipeline at the inlet of the ash storage pump at the rear of the electrostatic precipitator. According to the analysis, it was found that it was caused by the spontaneous combustion and coking of mixture of oil and pulverized coal which had not been thoroughly burned in the ash bucket.
Applicability Analysis of Directional Components in AC/DC Hybrid System
Authors: He Chenyun , Yang Binyuan
Published: July 2020

AC/DC hybrid power grids are more and more widely used in China, and the traditional relay protection directional components have experienced multiple misoperations. The adaptability of traditional directional components in AC / DC hybrid power grids is studied. Traditional direction components are based on fault sequence component network analysis. During the fault, the positive and negative sequence impedance of the AC-DC hybrid power grid is quite different, and the impedance angle of the line impedance and the equivalent impedance of the grid is no longer close to 90°. Misjudgment will occur in the direction component with sudden change, and performance cannot be guaranteed. As a result, directional elements based on the positive and negative sequence current branching coefficients being approximately equal are not suitable for AC/DC hybrid power grids. As for the directional element of the zero sequence principle, since the zero sequence network on the inverter side is relatively stable, its performance is reliable and it can operate correctly.
Research on the Comprehensive Energy Consumption of the Cable of the Radio Frequency Acquisition Terminal
Authors: Chen Xiangjin , You Dingjun , Wang Xiao , Cao Weijie , Xu Jianzhong , Bai Fan
Published: July 2020

Promoting two types and two transformations, and achieving two transformations is a medium- and long-term development strategy for cable implementation, and is committed to a smart, efficient, reliable, and green direction. The biggest difficulty in the research of distribution cables is the research of cables, and it is also the key point that affects the reliability of power supply. The article discusses the application of wireless radio frequency technology to the on-site identification of cables to improve the efficiency of on-site cable positioning and fault handling, improve power supply reliability, Cable intelligent, efficient and reliable cable research methods use radio frequency technology identification methods to collect on-site cable and equipment attribute information, establish on-site underground cable information identification network, establish data electronic ledger in the background, and then enrich the cable GIS system data, Analyse the comprehensive energy consumption of the cable, and provide a scientific research reference direction for the distribution network cable research.
Research on Key Technologies of Power System Automation Application under Smart Grid
Authors: Zhang Kexin , Tan Long , Chen Shiyu , Han Siwei , Zhang Dewen , Xu Minhu
Published: July 2020

With the continuous development of the scale of the power grid and the advancement of the integrated mode of regulation and control, the amount of real-time monitoring information in the power grid system has grown rapidly today, which has imposed a great burden on all levels of dispatch monitoring. The old alarm function of the power dispatching automation system has been unable to better meet the needs of efficient monitoring. Therefore, it is necessary to brush, analyse, process and summarize the alarm information of each link in the monitoring business, so as to improve the overall operation status of the power grid. Awareness and processing speed of abnormal faults. Based on this, this paper discusses and studies the smart alarms of the smart grid, analyses the overall architecture, and analyses several smart alarm technologies used in the smart grid system on this basis, with a view to the subsequent development of smart grids and alarms the technical research provides a theoretical reference.
Participation of distributed energy resources and renewable energy resources in different electricity market modes
Authors: Zhang Wei , Xie Xinglang , He Chaolin , Ma Haixin
Published: July 2020

At present, the domestic power spot market has just started, and the impact of distributed power and renewable energy power generation on power dispatch and market transactions needs further analysis. The electricity market models in Europe, North America and Australia are analyzed in this paper, and their impact on the market participation of renewable energy and distributed power is explained. First of all, the characteristics of each market system are briefly described, and then the transaction data of the current market and the intraday spot are compared and explained. The advantages and disadvantages of various market transactions are analyzed. All the analysis is to provide insight into china’s spot market construction for distributed energy resources and renewable energy resources.
Study of Design Theory and Application Software Development of Correct Calculation for Air Heaters Performance Test
Authors: Li Yuanyuan , Zhao Zhenning , Li Jinjing
Published: July 2020

Based on performance test of tri-sector rotary air heaters, the paper briefly proposed a correct calculating method of gas temperature, air temperature, air leakage rate and resistance. A Correct calculation software of air heaters performance test was developed. It can normalize and unify computation, solve some problems such as the organic combination of manual intervention and computer calculation and the cyclic iteration of some parameters. The study will help to improve speed and accuracy of computation, improve the efficiency of the economy and cost savings, enhance the competitiveness of power generators, and has an important utility value.
Research on Modeling of Wind-solar Hybrid Microgrid and Control Strategy of Maximum Power Load
Authors: Zhang Hongxin
Published: July 2020

As an important form of receiving renewable energy, microgrids can be a useful supplement to large grids, which can solve the power supply problem of residents in remote mountainous areas, pastoral areas, and islands. Modeling and simulation of energy management for microgrid operation characteristics with wind and solar storage have important practical significance. In this paper, mathematical models of photovoltaic cells and wind power systems are established, simulation models are constructed, and their respective characteristics are simulated and analyzed to verify the correctness of the mathematical models. A simulation model of maximum power point tracking for wind and solar power systems was established based on the respective shortcomings and limitations of independent operation of wind power systems and photovoltaic systems. According to the simulation results, it can be seen that the maximum power control technology used in this system can achieve maximum power tracking for wind power generation systems and photovoltaic power generation systems. The simulation results verify the correctness of the system and the feasibility of the control strategy.
Discussion of Qingfengling Small Hydropower Monitoring Training Base Construction
Authors: He Yi , Chen Jie , Zhang Liheng
Published: July 2020

Qingfengling Small Hydropower Training Base is a base under planning and construction of Sichuan Electric Power Company. The training is based on the relevant requirements of Technical Specification for Concrete Dam Safety Monitoring (DL/T5178-2003), Technical Specification for Earth-Rockfill Dam Safety Monitoring (SL 551-2011) and Technical Specification for Dam Safety Monitoring Automation (DL/T5211-2005) as well as the guidance of some laws and regulations such as Detailed Rules for Dam Safety Inspection of Hydropower Station and Regulations on the Safety Management of Reservoir and Dam. Combining the practice teaching characteristics of hydraulic instrument observation and drawing on the actual monitoring experience of Baozhusi Hydropower Station and Gongzui Hydropower Station, the content of the monitoring training is mainly divided into three parts: field inspection, instrument monitoring, and the collation, compilation and analysis of monitoring data. Combined with the three simulated dams that have been built in Qingfengling Teaching Power Plant, the training of hydraulic instrument observers mainly includes external observation and internal observation, which covers deformation monitoring, seepage observation, stress and strain and temperature monitoring.
Pollution and Treatment of Dye Waste-Water
Authors: Liu Qiang
Published: July 2020

With the rapid development of industry, the production of dye waste-water has increased year by year. Dye composition complex, high concentration, and high color, difficult to biodegradable substances, difficult to biodegrade. According to the chemical structure, dyes are mainly divided into eight categories, such as azo dyes; according to the application can be divided into 14 categories, such as reactive dyes, acid dyes and so on. Dyes show chroma contamination due to the presence of chromophore and chromophore in the molecular structure. Dye waste-water comes from dyestuff industry, printing and dyeing factory, wool spinning factory and other industrial enterprises. The treatment methods of dye waste-water include physical method, chemical method and biological method, among which biological method is economical and practical.
Research on Spray Granulation of Delay Explosive
Authors: He Aijiang , Liu Lixiu , Yu Huiling , Liu Yong
Published: July 2020

In view of the problems existing in the delay explosive granulation, a spray granulation technique was proposed. By spray granulation with Wolfram type delay explosive, the influence of safety related factors such as temperature and moisture on granulation was studied. SEM was used to analyze the morphology of the samples. Results demonstrate that the particles of the delay composition were spheres with diameter of 100-400 µm. A hollow ball is formed due to the rapid evaporation of water. The sample has good dispersibility and the moisture content is 4.42%.
Synthesis and Structure Research of Bis[N, N-bis(2-hydroxyethyl)dithiocarbamato-κ2S,S’]nickel(II)
Authors: Hou Lanfeng , Chen Shaofeng
Published: July 2020

New metal dithiocarbamate complex [(HOC2H4)2NCSS]2 Ni was synthesized by method of One-Pot synthesis and characterized by elemental analysis, IR spectra, melting point. The crystal structure was determined by X-ray single crystal diffraction. Complex [(HOC2H4)2NCSS]2Ni is monoclinic with space group P2(1)/c. Lattice parameters: a=6.3798(8) Å, b=11.8298(14) Å, c=11.4586(13) Å, β=93.63(0) °. Parameter ratio: a/b=0.5393, b/c=1.0324, c/a=1.7961. The data agreed well with the structure determined by X-ray single crystal diffraction.
Study on DOM adsorption behavior and influencing factors of Cd
Authors: Chang Min , Qu Shaodong , Li Yanan
Published: July 2020

In this paper, dissolved organic matter (DOM) in crop straw was used as adsorbent and Cd2+ was used as adsorbent to set a single factor to study the adsorption behavior of DOM on cd contamination. The optimal adsorption conditions were found, and the DOM was scanned with UV ism at the spectral level. provide a scientific basis for the later use of DOM in the treatment of Cd2+ in crops. The results of the single-factor test showed that the main factors affecting adsorption were DOM dose and pH. When the dosage of DOM solution was 0.25 mL, the adsorption rate of Cd2+ was about 72.3%, and when the addition of DOM solution reached 89.6%, the adsorption rate reached the highest point was 2 mL. When the pH is between 6 and 8, the adsorption rate of Cd2+ can be maintained in a highly efficient and stable state.
Advances in Microbial Remediation of Organic Contaminated Soil
Authors: He Lirong
Published: July 2020

With the growth of population and the rapid development of economy, the discharge of “three wastes” from industry keeps increasing, and the soil organic pollution keeps aggravating, which poses a great threat to human health and the safety of ecological environment. Now for typical organic pollutants, the main use of low cost, no secondary pollution and easy operation of bioremediation method, including composting, bioreactors, etc., and the main body of the repair technology are microbes, due to the microorganism has stronger adaptability to the environment, variability, in the process of survival differentiate into a variety of metabolic type, and can better adapt to the environment. With the development of genetic, genomic, proteomics and metabolomics technologies, knowledge about physiology, ecology, biochemistry and the regulation mechanism of microbial metabolic pathways has been greatly enriched. Therefore, in the future, we can study the degradation ability of the dominant degrading bacteria and their adaptation mechanism to pollutants through experiments, and study the composition of soil microbial community, community function and metabolic pathway through macro gene sequencing, so as to improve the degradation efficiency of bacteria to petroleum hydrocarbons, polycyclic aromatic hydrocarbons and halogenated hydrocarbons. It provides data support and theoretical basis for degradation of compound organic pollutants in natural environment.
Study on a Novel Compound of BION / BMO Enhancing Photocatalytic Activity under Visible Light
Authors: Xie Yafan , Hou Tian , Ma Jiami
Published: July 2020

A composite photocatalytic material had been designed in this paper by one-step hydrothermal method. With tetracycline as the target pollutant, Bi2O2(OH)(NO3)/Bi2MoO6-1 (mole ratio, labelled BION/BMO-1) showed the best photocatalytic performance among these catalysts. Through the morphological characterization of SEM, BION/BMO-1 complex is closely bonded by the flaky structure to form flower-like structure. XPS analysis shows that there is a strong interaction between Bi2O2(OH)(NO3) and Bi2MoO6 interface. Through BET result, BION/BMO-1 had the largest specific surface area, which enhanced its adsorption performance and ability of degradation pollutants.
Investigation on the performance of colored asphalt and pavement
Authors: Pei Xiaoguang , Fan Weiyu , Chen Song
Published: July 2020

Colored asphalt pavement is essential to beautify the city and manage the traffic. Colored asphalt was prepared by mixing aromatic oil, petroleum resin and styrene-butadiene-styrene block copolymer (SBS). The effect of aromatic oil, petroleum resin and SBS on the performance of colored asphalt was investigated. The results showed that aromatic oil help improve the low-temperature properties, resin can enhance the high-temperature properties, and SBS strengthen both high and low temperature performances. Qualified 70# colored asphalt was prepared by optimizing the formulation. The properties of colored asphalt mixtures indicated that the mixtures had superior rutting resistance and water stability, while low-temperature cracking resistance is inferior.
Study on the absorption-mineralisation for low-energy CO2 capture in BDA activated DEEA aqueous solution using calcium chloride
Authors: Lu Chunjie , Li Mengying , Xu Lihua , Fu Dong , Zhang Pan
Published: July 2020

The large amount of energy in the thermal regeneration process of the absorbent is a challenge for the CO2 capture technology. The CO2 absorption-mineralization was investigated, which is different from the traditional thermal method. 1,4-Diaminobutane (BDA) promoted 2-diethylaminoethanol (DEEA) aqueous solutions were used to capture CO2. In the desorption process, adding anhydrous calcium chloride (CaCl2) in CO2 loaded amine solutions can rapidly removal CO2 from the rich amine solutions. In addition, we also analyzed the mineralized products by X-ray diffractometer, and discussed the stability of cyclic absorption-mineralization technology.
Study on the purification of aquaculture wastewater by the compound wetland ecosystem
Authors: Qu Jiangqi , Jia Chengxia , Zhang Qingjing , Liu Pan , Yang Mu , Zhao Meng
Published: July 2020

Traditional freshwater aquaculture can easily cause serious environmental problems and waste of water resources. Thus, ecological bioremediation techniques for freshwater pond environments are more attractive. In this study, a set of compound wetland ecological system with ecological ditch, constructed wetland and multi-functional ecological pond was constructed, and its purification effect was also evaluated. Our results showed that the compound wetland ecosystem has high removal efficiency for aquaculture wastewater. The concentration of total nitrogen, ammonia nitrogen, Nitrite Nitrogen, total phosphorus, and chlorophyll-a in each treatment unit gradually decreased after the system was stabilized. The annual average removal rates of TN, NH4
+-N, NO2
−-N, TP and Chl-a can reach 73.03%, 74.27%, 91.89%, 64.29% and 83.02%. We found ammonia nitrogen concentration was significantly biodegraded (p <0.05) by the ecological ditch, as well as constructed wetland and multi-functional ecological purification pond had obvious removal effect on TN, TP, NH4
+-N, NO2
−-N, and Chl-a (p <0.05). Moreover, the concentrations of pollutants after purification were lower than the standard value of fishery aquaculture water quality in China, and the purified water was recycled to fish ponds for reuse. Therefore, the compound wetland ecosystem can be adopted by the water shortage area to develop water-saving fisheries in the future.
The formation mechanism and thermal stability of CaCrO4
Authors: Wu Yingjiang , Song Shengqiang , Xv Yongbin , Xue Zhengliang
Published: July 2020

The Cr(VI)-containing phase CaCrO4 is a typical hexavalent chromium compounds, a huge harm to human and environment. Therefore it is very important to investigate formation mechanism and thermal stability. This paper studies the effect of temperature and atmosphere on the CaCrO4 form, and high temperature stability is studied using XRD and TG-DSC. And CaCrO4 just forms in air atmosphere below 1000 °C. When pure CaCrO4 is heat to 1100 °C, it decomposes to CaCr2O4.
Effect of Modified Biochar on the Remediation of Pb-Contaminated Soil
Authors: Liu Miao
Published: July 2020

High levels of heavy metals, particularly of lead, in soil and water occur worldwide in many countries. Due to the harmful consequences on human health, it is mandatory to avoid Pb-contaminated soils and waters to enter in the food chain. In this research, biochar was prepared by corn stalk paralysation and alkali-modification. BCR sequential extraction method was employed to evaluate the morphological changes of lead in soil and a pot experiment was conducted with garland chrysanthemum as an indicator plant to investigate the bioavailability of lead in soil with biochar. The results indicated that alkali-modified biochar KBC showed strong immobilization abilities and could reduce the mobility and bioavailability of lead in soil.
Treatment of Penicillin Wastewater by Sequencing Batch Reactor
Authors: Xu Sen , Tian Yinghui , Xia Hongsheng
Published: July 2020

During the treatment of penicillin wastewater, facultative and aerobic bacteria in intermittent aeration can effectively degrade the organic matter in the wastewater without physical and chemical pretreatment of SO4
2- and DTAB. When the highest COD concentration of the influent is 12 000 mg/L, the load is 8 kgCOD/(m3·d), and the maximum impact load is 13 kg COD/(m3·d), COD removal rate can reach over 87%. The foam produced by DTAB in penicillin wastewater will not affect the normal operation of the SBR treatment plant. The foam can disappear in the aeration process, and eventually the DTAB can achieve more than 97% removal rate. Therefore, sequencing batch reactor is an ideal way to treat penicillin wastewater.
Research on sewage treatment based on the Automation system
Authors: Wang Xinyang
Published: July 2020

With the rapid development of the social economy in China, although people’s living standards have improved, the problem of environmental pollution is becoming more and more serious, especially the pollution of water resources. A large amount of sewage is often discharged in life and production, which will pollute the underground, lakes, rivers and other water resources, and then affect people’s normal life and life safety. However, the efficiency of the sewage treatment system at this stage is relatively low, which is difficult to meet the needs of today’s social development. In this case, to improve the effect of sewage treatment, it is necessary to use electrical control automation and make scientific and rational use of the advantages of electrical control automation to fundamentally improve the efficiency of sewage treatment. This paper focuses on the electrical control automation of the sewage treatment system and shows some new intelligent control technologies.
Study on Preparation and Performance Evaluation of Environment-Friendly Asphalt Mixture
Authors: Xia Jianping , Dong Zhao , Yang Fei , Xia Quanping
Published: July 2020

In this paper, the environmental characteristics of foaming asphalt mixture are analyzed and the benchmark ratio is determined by Marshall test. Through the research on the production control parameters of mineral foaming and mechanical foaming, on the one hand, the optimal content of ZQ mineral foaming agent was determined to be 7%. On the other hand, The water consumption for mechanical foaming of SBS modified asphalt was set as 3.0±0.2%, the asphalt temperature was set as 165±2°C, and the water temperature was set as 30±2°C. At the same time, a method for determining the optimal content of mineral foaming agent based on asphalt modulus evaluation is proposed, and determine the influence degree of each factor of mechanical foaming based on grey correlation method. During the mixing test, the actual production was simulated, the samples were formed after the mixture aged for 2 hours in a short time, and the cooling range and performance of the foamed asphalt mixture were studied. The results show that the foamed asphalt mixture can reduce about 25°C compared with the hot-mixed asphalt mixture, and the performance of the mixture can meet the requirements of the current specification.
Numerical Simulation Optimization and Experimental Study of Vacuum Ultraviolet Solution Equipment Based on CFD Technology
Authors: Yuan Hao , Liu Ruixin , Guan Jie , Dai Jue , Su Ruijing , Guo Yaoguang , Liu Yong , Peng He
Published: July 2020

In order to improve the photo-degradation efficiency of waste gas and the utilization rate of ultraviolet lamp, numerical simulation software was used to simulate the wind speed field in ultraviolet equipment. The simulation of uniform and dislocation arrangement of ultraviolet lamp in ultraviolet equipment, taper of variable diameter of equipment, transverse flow and cis flow of ultraviolet equipment is presented. The results show that the gas flow in the equipment is more uniform than that in the ultraviolet lamp. The reducing taper of ultraviolet equipment becomes smaller, and the gas retention area gradually becomes smaller. When the reducing taper is reduced to 30°, it is most suitable. The wind speed field in the downstream ultraviolet equipment is more uniform than that in the horizontal flow type, and the ultraviolet utilization rate is higher. In addition, the tubular downstream ultraviolet equipment can not only ensure the utilization rate of ultraviolet lamp, but also improve the degradation effect of organic waste gas.
Study on Influencing Factos of Wet Oxidation Technology
Authors: Liu Qiang , Wang Yibo
Published: July 2020

For refractory organic wastewater treatment, this water treatment industry is difficult, wet oxidation technology can effectively play a role. The effect of chemical reaction is closely related to the process conditions of operation (that is the influencing factors). The influencing factors of wet oxidation technology include nine aspects: reaction temperature, reaction pressure, reaction time, stirring strength, influent pH value, influent concentration, salt effect of influent, nature of influent, reaction heat of wastewater and amount of air needed. Among these factors, the reaction temperature is an important influence factor, and the relationship between the chemical reaction velocity constant and temperature follows the arenius formula.
Influence of Oil Pollution on Soil Water and Fertilizer Coordination Ability
Authors: Yang Wei
Published: July 2020

The soil guarantees the normal growth and development of the plant by coordinating the nutrition and environmental conditions such as water, fertilizer, gas, and heat. However, once the soil is polluted by oil, its own ability to coordinate water and fertilizer will inevitably be affected, thereby affecting plant growth. Therefore, it is proved that the impact of oil pollution on the coordination ability of soil water and fertilizer is the basic prerequisite for the reuse and restoration of contaminated soil. This article can provide basic guidance for the use and remediation of contaminated soil.
Effects of Different Amelioration Materials on Soil Fertility in Abandoned Homestead Reclaimed Soil
Authors: Wei Binmeng
Published: July 2020

Abandoned homestead reclaimed soil has poor structural structure and lack of nutrients. In this study, organic fertilizer (F), curing agent (S) and fly ash (C) were used as amelioration materials to improve nutrient content of abandoned residential land reclamation soil. After 3 years of wheat-corn rotation, soil samples were collected to determine soil organic matter, total nitrogen, available phosphorus and available potassium contents. The results showed that soil organic matter content at the depth of 0-30 cm soil layer in the treatments of F increased significantly due to organic fertilizer input. The content of total nitrogen, available phosphorus and available potassium in the treated soil with improved materials increased significantly compared with the control. It indicated that the addition of amelioration materials and continuous tillage had significant effect on improving soil fertility in the abandoned homestead reclaimed soil.
Research on Failure Mechanism of a Digital to Analog Converter Induced by Electrochemical Decay
Authors: Lian Pengfei , Zhang Hui , Wang Xixi , Pan Ying , Yang Liangliang , Kong Zebin , Zhu Weiming , Lou Jianshe , Wang Kunshu
Published: July 2020

This paper focus on mechanism of a digital to analog converter induced by electrochemical decay. The electrical parameters and the I/V characteristics of the digital to analog converter are abnormal, and the 11-pin of the device are open because of the decay. By the scanning electron microscope inspection and the energy spectrum analysis to the decay, the carbon and the oxygen of the decay are relatively high, and there exists decaying elements chlorine. The mechanism of the electrochemical decay is analysed, the reason of the electrochemical decay contains three elements: moisture, decaying elements and electric field. Moreover, the 11-pin has the worst decay resulted from the strongest electric field, inducing the opening of 11-pin and the failure of the digital to analog converter.
Effect of Calcination Temperature on the Performance of Pd-Based Catalysts
Authors: Zhang Yongli
Published: July 2020

It is difficult to biodegrade organic waste-water, which is treated by catalytic wet oxidation method. The catalyst Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3), and the calcination time was 3 h, and the calcination temperatures were set to 400, 550, 700, and 850 °C, respectively. When the calcination temperature was 550 °C, the experimental results show that: when Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) is added with, the pH of wastewater is reduced, and then the pH will rise again; the Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) catalyst has good decolorization effect at 4 calcining temperatures, which can reach 92.7% - 97.9%, and 36.6% - 41.8% higher than the blank without catalyst; the best treatment effect is when the calcination time is 3 h and the calcination temperature is 550 °C. The addition of Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) after treatment of printing waste-water, its COD removal rate increased significantly, and the final effluent percentage reached 71.7% - 88.8%.
Efficacy of Anaerobic Treatment of Fur Wastewater under Different Pre-Acidification Degrees
Authors: Chang Min , Qu Shaodong , Zhang Panpan
Published: July 2020

In this research, we studied fur processing wastewater and examined the effect of acidification degree on the treatment performance of internal circulation anaerobic reactor (IC). The results showed that the acidification degree had significant effects on the removal rate of CODcr, effluent volatile fatty acid content (VFA), stability of the system and the microbial biomass of granule sludge in IC. When the acidification degree of wastewater is about 45 %, the removal rate of CODcr is more than 70 % in the anaerobic system. Although the effluent VFA is higher, there was no inhibition in acidation, the effluent ALK/VFA maintained at about 1.3, the anaerobic system run stably and well, granule sludge microbial biomass maintained at about 80% as well as in good activity. In practical engineering applications, controling the acidification degree at about 45 % can maintain the anaerobic system stable, efficient CODcr removal and the steady growth of microbial in granule sludge.
Membrane module assembly enhances the performance of A/O-MBBR in treating mariculture wastewater
Authors: Wu Yiwei , Wang Xinyu , Zhou Yiling , Li Yunhui , Zhao Yangguo
Published: July 2020

The anoxic-aerobic moving bed biofilm reactors (A/O-MBBR) run stably with influent of low C/N ratio and present a promising application in treating mariculture wastewater. However, the nitrogen pollutants removal is still not acceptable and fails to meet the strict effluent standards. Thus, in this study, a membrane module assembly was installed in the sedimentation tank of the A/O-MBBR to improve the water quality of effluent. The results showed that the removal rates of different nitrogen species were highly enhanced by installing the membrane instrument and 98.16% ammonia and 92.61% nitrate were finally removed. which led to significant reduction of total nitrogen pollutants to 0.70 mg/L in the effluent and thus met the requirement of national standard of the mariculture wastewater discharge. This study indicates that the combination of A/O-MBBR and the membrane module assembly is of great strategy for the efficient treatment of mariculture wastewater.
Efficient production of L-lactic acid from corn straw hydrolysate
Authors: Si Hongyu , Liang Xiaohui , Liu Suxiang , Xu Meirong , Wang Jianmei , Hua Dongliang
Published: July 2020

In this study, L-lactic acid was produced from corn straw hydrolysate by the strain Lactobacillus sp. L47, the fermentation conditions such as nitrogen sources, mineral salts, metal ions, incubation periods, pH values and temperatures were investigated, and the optimal incubation conditions were obtained: corn straw hydrolysate of 243.1 ml/l, (NH4)2SO4 10 g/l, yeast extract 10 g/l, KH2PO4 0.5 g/l, ZnSO4 • 7H2O 0.3 g/l, MgSO4• 7H2O 0.1 g/l, MnSO4• H2O 0.01 g/l, CaCO3 60 g/l, initial medium pH 6.0, controlled fermentation pH 6.0, 20 ml of seed, incubation temperatrure 46 °C. Under the optimal fermentation conditions, the highest L-lactic acid production was 99.8 g/l in 40 h.
Synthesis and surface activity evaluation of new surfactants derived from cetyl betaine
Authors: Yang Jian , Liu Anbin , Li Ze , Ma Yanfeng , Lv Shiyi , Dong Sanbao
Published: July 2020

Because the surface tension, foaming ability, high temperature resistance, methanol resistance, salt resistance and foam shape of the single cetyltrimethylammonium chloride and cetyltrimethylammonium chloride reaction with formaldehyde are not very significant. Therefore, the product HM-CTAC and cetyl betaine were selected to optimize the compound ratio and further evaluate the performance of the compound product. The foam volume decreases gradually with the increase of temperature; in the aspect of methanol resistance: the foam volume of the compound surfactant disappears slowly under the same methanol concentration; in the aspect of salt resistance: the foam height is more stable with the increase of salt concentration in the system, and the half-life decreases gradually; the surface tension and foam microscopic: the surface tension of the compound system decreases.
Long single crystalline α-Mn2O3 nanorods: facile synthesis and photocatalytic application
Authors: Chandiran Kalaiselvi , Murugesan Ramesh Aravind , Balaji Revathi , Andrews Nirmala Grace , Pitchaimuthu Sudhagar , Nagamuthu Raja Krishna Chandar
Published: July 2020

Single crystalline cubic sesquioxide bixbyite α-Mn2O3 nanorods have been synthesized successfully by a simple, low cost, environmental benign hydrothermal route. As synthesized γ-MnOOH were calcined at 600 °C to obtain α-Mn2O3 nanorods, which were further subjected to various characterizations. The alpha manganese sesquioxide cubic bixbyite-type oxide formation was confirmed by the XRD studies. The surface morphology and elemental analysis were explored by SEM with EDX studies, respectively. High-resolution transmission electron microscopy HRTEM and SAED showed that the α-Mn2O3 nanorods were single crystalline and were grown along the C-axis of the crystal plane. The UV–visible spectrum indicated that the absorption was prominent in the ultraviolet region. In addition, PL spectrum result of α-Mn2O3 nanorods recommended possible photocatalytic applications. The photocatalyst ensures a new platform for the decolorization of dye molecules of the harmful cationic dyes like methylene blue and rhodamine B. Possible growth mechanism and photocatalytic dye degradation mechanism were proposed for synthesized α-Mn2O3 nanorods.
Hot deformation behavior and microstructure characteristic of 2055 Al-Li alloy during uniaxial compression
Authors: Dongmei Jiang , Changqing Yuan , Xiang Li , Hui Yu
Published: July 2020

The hot deformation behavior of as-extruded 2055 Al-Li alloy at T6 state has been investigated by uniaxial hot compression test in a Gleeble-3800 thermal simulation machine at the temperature of 320 oC, 380 oC, 440 oC, 500 oC with strain rate ranging from 0.001 s−1 to 1 s−1. Deformation instability occurred under the deformation condition of 380 oC/5 s−1 and at the deformation temperature of 500 oC via the shape of flow curve and the side view observation of the compressed samples. The serration in flow curve of the low strain rate suggests occurring of DSA. The constitutive equation based on Arrhenius equation were established with the deformation activation energy of 174.6 kJ mol−1. The microstructures of the compressed samples were analyzed by OM and TEM, the DRXed grains could be observed in the compressed samples at 440 oC with strain rate of 1 s−1 and 0.001 s−1. The dominated precipitates in the alloy were plate-shaped T1 phase and spherical β
1 phase. The precipitates-dislocations interaction was analyzed by HRTEM. The dislocations could be pinned by both the T1 phase and β
1 phase, and the precipitates and dislocations around them divided the grain into small zones, and the misorientation across the dislocation was about 0.8o.
Using the Case-Crossover Design to Assess Short-Term Risks of Bleeding and Arterial Thromboembolism After Switching Between Oral Anticoagulants in a Population-Based Cohort of Patients With Atrial Fibrillation
Authors: Hellfritzsch Maja , Wang Shirley V , Grove Erik Lerkevang , Gagne Joshua J , Hallas Jesper , Pottegård Anton
Published: July 2020

Using nationwide Danish registries, we conducted a population-based case-crossover study evaluating the association between switching from a vitamin K antagonist (VKA) to a direct oral anticoagulant (DOAC), and vice versa, and 30-day risks of bleeding and arterial thromboembolism in patients with atrial fibrillation (AF). The case-crossover population was identified among oral anticoagulant users during 2011–2018 (n = 123,217) as patients with AF with 1) a case-defining outcome and 2) an anticoagulant switch during the 180 days preceding the outcome. Odds ratios were estimated using conditional logistic regression by comparing the occurrence of switching during the 30-day window immediately preceding the outcome to that in reference windows in the same individual 60–180 days before the outcome. The case-crossover populations for switching from VKA to DOAC and DOAC to VKA comprised 1,382 and 287 case patients, respectively. Switching from VKA to DOAC, but not from DOAC to VKA, was associated with an increased short-term risk of bleeding (odds ratio = 1.42; 95% confidence intervals: 1.13, 1.79, and 1.06; and 0.64, 1.75, respectively) and ischemic stroke (odds ratio = 1.74; 95% confidence intervals: 1.21, 2.51, and 0.92; and 0.46, 1.83, respectively). Our findings suggest that switching from VKA to DOAC is an intermittent risk factor of bleeding and ischemic stroke in patients with AF.