bluuebunny/crossref_metadata_2025 huggingface dataset:
The Study on Applied Status Stability of Water-Based Cutting Fluids at Numerical Control Machining of Aviation Aluminum Alloy
Authors: Xu Qiang , Chen Xuezhen , Hu Jinlong , Li Lianyu
Published: December 2020

When water-based cutting fluid is used in aviation aluminum alloy NC machining, soap precipitation and emulsification often occur due to its poor stability. It can cause the metal plate or equipment parts to scale or block the cutting fluid pipeline and filter system, which seriously affects the service life of the cutting fluid and the normal use of the equipment. At present, there is a lack of suitable evaluation standard for the stability of application state of water-based cutting fluid. In this paper, through the analysis of the state stability of four kinds of water-based cutting fluids, the state stability evaluation test is formulated. The hard water stability test and emulsion stability test are carried out for two kinds of semi synthetic cutting fluid and two kinds of fully synthetic cutting fluid. The test results show that this evaluation test can effectively evaluate the state stability performance of aviation aluminum alloy cutting fluid, and provide guidance for the optimization and management of cutting fluid in numerical control machining.
Remote Sensing Recognition of Construction Waste Accumulation Based on Resources satellite three Multi-view Stereoscopic Image
Authors: Jia Ziyi , Chen Qiang , Hong Shu , Cheng Qianhao
Published: December 2020

Due to economic growth and the development of urban modernization, the amount of construction waste is increasing year by year. The rapid identification of large-scale construction waste deposit is beneficial to improving urban planning and management capabilities. This article is based on the three-line array image stereo data of Resources satellite three to obtain DEM. At that time, Renzhuang Village in Pingdingshan was a test area. Based on the DEM elevation change information, the surface roughness coefficient of the structured surface was used as an irregular elevation texture feature, combined with the slope and aspect, to obtain the construction waste accumulation of other ground objects in the surrounding area. The overall recognition rate is 85.12%, and the Kappa coefficient is 0.70. It provides application value for the rapid identification of construction waste accumulation and its change information management and safety instability analysis.
Analysis of Temporal and Spatial Evolution and Influence Factors of Cultivated Land in Pearl River Delta Based on GIS
Authors: Zhao Xiao Juan , Ye Yun
Published: December 2020

In order to better explore the characteristics of the spatiotemporal changes of cultivated land, this paper comprehensively considers the utilization change of cultivated land in the Pearl River Delta from the multiple dimensions of the dynamic degree of cultivated land quantity change, location entropy, flow change, relative change rate of utilization, center of gravity, spatial characteristics of change rate, etc. from 2000 to 2014, in order to manage land use better and provide references for the protection of cultivated land, food security and sustainable use of land resources. The results show that the cultivated land and per capita cultivated land area in the Pearl River Delta region both showed a rapid decline and decreasing trend at the beginning, and then gradually eased. The degree of arable land use continues to increase and has developed from extensive to intensive. From the perspective of space, the rapid economic development areas such as Guangzhou, Foshan, Dongguan and Zhongshan have suffered serious loss of cultivated land. The demand for various types of construction land is constantly expanding. The adjustment of agricultural structure has exacerbated the non-agriculturalization of cultivated land. On the whole, the use of cultivated land in the Pearl River Delta has a tendency toward the south.
Willingness to pay for tourism ecological compensation and its influencing factors——Taking the best spring in the world in Ji’nan as an example
Authors: Zhang Ying , Li Yunyan
Published: December 2020

Tourism activities have a certain impact on the ecological environment of scenic spots, and ecological compensation is an effective economic means to protect the ecological environment. Taking the best spring in the world scenic spot in Jinan as an example, based on the contingent valuation method (CVM) and the establishment of binary logistic regression model, this paper studies the willingness to pay and the influencing factors of tourist ecological compensation. The results show that: 75.2% of tourists are willing to make ecological compensation, and the average willingness to pay is 3.99 yuan / person time; the main factors influencing the willingness to pay are gender, income level, tourist satisfaction, and tourists’ cognition of ecological protection; besides paying compensation, tourists are willing to participate in environmental protection publicity and clean the scenic area environment as volunteers Environment.
A study on the post-evaluation system of functional upgrading and transformation for old urban industrial areas
Authors: Yue X Y , Pan H Y , Tang P , Sun H , An Y
Published: December 2020

At the beginning of the 21st century, China began to transform and upgrade the old urban industrial areas. At present, it is relatively lack to research the post-evaluation system of functional upgrading and transformation for old urban industrial areas. This paper chooses and analyzes 24 typical projects of regeneration and transformation for old urban industrial areas through literature research. On the basis of analyzing the relevant literature research, policy implementation and practice results of typical projects, this paper proposes a post-evaluation system with comprehensive influence as the target and 5 influence dimensions and 21 evaluation factors through combining qualitative and quantitative techniques. Based on this, the connotation of evaluation factors is analyzed, so as to form a practical post-evaluation system of comprehensive influence.
Application research of flue gas depth reduction modification technology in 600MW thermal power unit
Authors: Nie Peng-Fei , Liu Zhi-Yuan
Published: December 2020

According to the policy requirement of No. 156 in 2018, the wet flue gas desulfurization system of a 600 MW unit in a power plant needs to be reformed for deep emission reduction. Based on the technical route of flue gas cooling and condensing, the influencing factors such as exhaust gas temperature and exhaust fan allowance are analyzed, and the design boundary parameters are reasonably selected. The technical characteristics of flue gas condenser and slurry cooler are compared. It is pointed out that slurry cooler has the advantages of no increase in flue gas system resistance, non-stop construction and low energy consumption, and is more suitable for field renovation. Aiming at the water balance problem of desulfurization system after using slurry cooler, this paper combs and analyzes the water balance items, and takes a series of measures: demolishing the first-stage absorber demister, collecting filtrate water and filter cloth washing water for pulping, recovering the slurry circulating pump sealing washing water, etc., which can basically meet the transformation needs. Special-shaped tray is installed in the absorption tower to improve the desulfurization and dust removal performance.
Dynamic experiment on de-fluoridation of Manganese-loaded Activated Alumina
Authors: Kang Ning , You Kun , Fu Jinxiang , Huang Diannan , Gao Yujia , Yang Rui
Published: December 2020

This work used Manganese-loaded Activated Alumina (MAA) as the adsorbent to analyze the effect of column height and filtration rate on the removal of fluoride and iron ions, and clarified the fluoride removal mechanism by using dynamic experiments when the fluoride and iron in drinking water exceed the standard at the same time. The results showed that the height of the column and the filtration rate have a significant impact on the operation of the system. It was the best operating condition for the system that the filtration rate was 1m/h and the column height was 300mm. After the system run for 102 hours, the fluoride ion effluent concentration exceeded the standard, which was 1.02mg / L; the concentration of iron ions in the effluent reached the standard stably after the system run for 1 hour, and the concentration was not more than 0.18mg/L. When the filtration rate was 1m/h and the column height was 150mm, the stable running time of fluoride removal of MAA column was 2.5 times that of ordinary activated alumina (AA); the start-up time of MAA to remove iron ions was one-twelfth of AA. The effect of removing fluoride and iron by MAA was significantly better than AA.
Numerical Investigation on Conjugate Heat Transfer in Helical Coiled Tube under Vertical Placement
Authors: Zhao Z X , Ma C , Li Y Q , Lu D , Lin Y S , Liu Y , Dai C H , Xiao Q , Gou J L
Published: December 2020

Conjugate heat transfer of supercritical CO2 inside helical coiled tube under vertical placement was investigated numerically in the present study. It can be concluded that the flow field of supercritical fluid is affected by both the buoyancy force and centrifugal force in conjugate heat transfer process. The dual effects of buoyancy force and centrifugal force lead to the deflection of second flow direction for the vertical placement, and further results in the heat transfer deterioration region on top generatrix wall for the downward flow larger than that for the upward flow. However, the overall heat transfer performance is slightly better than that in the upward flow in tube side.
Causes and solutions of a group split of resistance-capacitance absorber for parallel reactor
Authors: Li Suya , Zhang Chi , Li Lin , Dong Yanwei , Sun Zhao
Published: December 2020

The resistance-capacitance absorber is used in conjunction with the shunt reactor and is an important power grid equipment used to absorb the intercepted over-voltage generated during the switching process of the vacuum circuit breaker. However, the quality of the RC absorber itself affects the normal operation of the system to a certain extent.In this paper, group-cracking and oil-spilling fault of RC absorber in a 220kV transformer substation is on-site inspection, comparison test and disintegration. On this basis, solutions have been proposed, which have a certain significance to solve the group-cracking and oil-spilling fault of RC absorber.
Applications of Concentrating Photothermal Reactor in Coal Combustion Research
Authors: Li Hanjian , Chi Huanying , Hu Song , Yu Pengfeng , Huang Haizhou , Guo Tingting , Xiang Jun
Published: December 2020

High temperature, rapid heating rate and application potential of special reaction conditions (high pressure, high humidity, corrosive atmosphere) made the concentrating photothermal reactor (CPR) become a hot spot in the thermal experimental research. By the 1930s, the concepts of radical reactions and thermal equilibrium concepts had contributed to the formation of theoretical basis of coal combustion. The application of concentrating photothermal reactor in coal combustion research had provided a new perspective for this traditional subject. This paper introduced the structure and characteristics of concentrating photothermal reactor, and summarized the latest research results on the influence of heating rate, oxygen concentration and biomass addition on coal combustion. A potential frontier research direction - pressurized combustion based on concentrating photothermal reactor was also proposed.
Pipe Designs of the Closed Feedwater Heater Rankine Cycle Power Plant
Authors: Li Mingcheng , Luo Hongtao , Peng Maolin
Published: December 2020

How to lower global energy consumption and improve energy conversion efficiency remains a major challenge in the fields of science and technology. Scientists have done tremedous work to save energy. For example, scientists have improved and designed the different parts of heating systems to make it approach the thermal idealized cycle, in order to increase the waste-heat utilization rate and convert heat into other forms of useable energy. After thorough study of the Closed Feedwater Heater (FWH) Rankine Cycle power plant, this paper shows two possible designs to increase energy efficiency: the Cylinder and Sphere Feedwater Heater, and the Pipeline Mini Turbine. Compared with the old system components, they convert steam’s kinetic energy into usable electricity or other forms of energy and reduce the waste of energy caused by temperature differences and circulations. As a result, they increase the heat transfer efficiency between water and steam in the feedwater heater and save more money because of the reused component.
A typical dry-type iron core reactor failure and its treatment measures
Authors: Li Suya , Man Yuyan , Sun Zhao , Li Songyuan , Chen Rong , Zhao Cong
Published: December 2020

Dry-type iron core reactors frequently have various insulation faults due to their own process defects and operating environment impacts, which pose a certain threat to the safe and stable operation of the power grid. In this paper, the technicians conducted overall tests, on-site analysis, and comprehensive judgment on a 220kV dry-type iron-core shunt reactor, and proposed solutions on this basis, which have certain guiding significance for solving the insulation failure of the iron-core shunt reactor.
A Study on Decoupling of Carbon Emissions from Beijing-Tianjin-Hebei Transport Industry
Authors: Li Xinyue
Published: December 2020

As the world’s largest carbon emitter, the Chinese government is actively taking responsibility for reducing emissions and formulating relevant policies to achieve a low-carbon economy. The transportation industry is the third largest greenhouse gas emission source after the power industry and the steel industry in China, so the transportation industry is an important sector of carbon emission reduction in China. The Beijing-Tianjin-Hebei region is one of the supporting platforms for China’s strong competitiveness in the international economic system, but its transportation system develop pment is not balanced, and there are also great differences in energy consumption and carbon emissions. Therefore, it is of great significance to study the correlation between carbon emission and economic growth in The Beijing-Tianjin-Hebei region. In this context, this paper takes the Beijing-Tianjin-Hebei transportation industry as the research center, explores the decoupling relationship between its industry growth and carbon emissions, and gives relevant conclusions.
An Operation Time On-line Setting Method of Distance Protection Section II & III for 220kV Transmission Line
Authors: Wang Shuyang , Qi Xuanwei , Li Tianhua , Wang Song , Wang Xingguo , Guo Yarong
Published: December 2020

Section II and section III of distance protection are widely used as backup protection for 220kV transmission line. In order to ensure that the line distance protection can act correctly and cooperate with each other, it is necessary to set the impedance and time setting value of distance protection. At present, the time setting values of section II and III of power grid distance protection are fixed action time limits calculated by manual calculation or computer setting calculation program offline. In this paper, an on-line setting technology for section II and section III of distance protection is proposed. The operation time of section II and section III of distance protection is determined by measured fault impedance. As long as the distance protection section II and section III operates, the operation time can be calculated according to the formula proposed in this paper, and the operation time of protection section II and section III of the upper and lower level lines can meet the coordination relationship, and the operation time difference meets the requirements. Through modeling and simulation, it is proved that the method proposed in this paper is feasible.
Research on capacity configuration optimization for island microgrid with PV-wind-diesel-battery and seawater desalination load
Authors: Fu Yu , Tang Junci , Cui Jia , Yang Junyou , Cheng Shanshan
Published: December 2020

According to the situation of abundant renewable energy but insufficient fresh water on the island, using seawater desalination equipment as a time-shifting load can better absorb the output of renewable energy and eliminate the surplus electric energy. In this paper, the optimal configuration of wind solar diesel storage island microgrid capacity considering the time-shifting load of seawater desalination equipment is studied. The optimal allocation model of island microgrid capacity with wind solar diesel storage and seawater desalination load is established. The optimal objective function of capacity allocation is the system equivalent annual investment cost. The results show that considering the time-varying load of seawater desalination equipment, the optimal configuration strategy of wind solar diesel storage island microgrid capacity can improve the consumption of renewable energy, reduce the waste of capacity, solve the problem of island freshwater shortage to a certain extent, and improve the economic and environmental benefits of the island.
Electricity market dynamics: The influence of fuel prices and the spillover effect
Authors: Ding Weibin , Xu Yang , Gao Feng , Wu Binjie , Fu Yue
Published: December 2020

Fossil energy power generation still plays a key role in the power generation industry, especially for countries where thermal power generation still dominates. With such potential considerable impact, this article aims to analyze the drivers of peak and valley electricity prices from the perspective of thermal power fuel. Specifically, the study uses data from the highly market-oriented US PJM power market to conduct an empirical analysis and focused on the links with coal, crude oil, and natural gas. Applying the Barunik and Krehlik index method to measure the spillover effect, we find that there is an obvious two-way spillover effect between the thermal power fuels and the electricity market. Besides, such an effect mainly occurs in the short time horizon, and natural gas plays a key role in transmitting the information to electricity prices. At last, this paper further builds a connectedness network based on the results of the pairwise spillovers, thereby visually displaying the cross-market connections.
State of charge estimation of lithium-ion battery based on double deep Q network and extended Kalman filter
Authors: You Guodong , Wang Xue , Fang Chengxin , Zhang Shang , Hou Xiaoxin
Published: December 2020

The state of charge (SOC), as an important parameter of the lithium-ion battery management system (BMS), is an important factor affecting the current battery detection and safety issues. Due to the non-linear characteristics of the lithium-ion battery charging and discharging process, it is difficult to model the BMS and estimate the SOC accurately. This paper takes lithium-ion battery as the research object, designs the Markov decision process (MDP) model of lithium-ion battery energy storage prediction, establishes the second-order RC equivalent circuit model (ECM) and extended Kalman filter (EKF), and proposes a method based on double deep Q network (double DQN) to optimize the EKF parameters SOC estimation method to solve the problem of dimensionality disaster and value function overestimation generated in deep reinforcement learning (DRL). Through the effective verification of the lithium-ion battery SOC estimation algorithm, the simulation results show that compared with the traditional deep Q network (DQN) algorithm, double DQN has better convergence, adaptive ability and better estimation accuracy. It can provide new ideas for the accurate estimation of SOC.
Research on the Development of pure electric vehicle power battery Technology based on patent analysis
Authors: Yuan Xinyue , Wu Jie
Published: December 2020

Power battery is the key to the widespread use of pure electric vehicles. In this paper, patent mining and data analysis technology are adopted to summarize the development trend and main patentee of battery electric vehicle power battery patent technology. Combined with the patent text, the key technologies in the field of battery electric vehicle power battery in recent years are analyzed in depth. The research results show that China has entered a period of rapid technological development in the field of battery electric vehicle power battery, and its innovation subjects are mainly enterprises. The key technologies mainly focus on three aspects: battery heating, battery cooling and charging methods.
A demand-side integrated flexible load regulation optimization strategy for clean energy consumption
Authors: Yu Fu , Feng Jiang , Jia Cui , Yang Jun You , Yan Xinyue , Jin Yonghui , Liu Yunfei
Published: December 2020

In order to absorb large-scale clean energy for power grid, the use of energy storage technology is paid more and more attention. However, most of the current researches are focused on a single kind of energy storage forms, and few are involved in the joint use of multiple energy storage devices. This paper aims at the insufficient application of a single energy storage device and the conflict between multiple energy storage technologies. A demand-side integrated flexible load regulation optimization method is proposed. For the heat storage electric boiler system and the ice storage air conditioning system, the combined algorithm is used to optimize their operation. It is clear that the combined algorithm based on genetic algorithm combined with cold, hot and electrical system has a more significant effect of absorbing clean energy than the single energy storage system. And, the example result proves the correctness and feasibility of the proposed comprehensive demand side response strategy.
Screening of silage maize cultivars for their agronomic traits in Hohhot of China
Authors: Li Juan , Wang Yufen , Bai Lanfang , Wang Yanan , Sun Hongjun , Jia Kai
Published: December 2020

The study was conducted to determine yield and agronomic traits of some silage corn varieties in Hohhot of Inner Mongolia Autonomous Region, China, in order to screen several suitable varieties grown as the main forage in Hohhot. The study was established to randomized complete block design pattern with three replications in irrigating conditions. In this research, agronomic traits including growing stages, days from emergence to silage harvest, plant height (cm), ear height, stalk diameter, number of green leaves, lodging rate, empty stalk rate, double strike rate, forage yield, and forage nutritive traits including crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), were determined in 34 silage corn varieties. The results showed that most of the varieties showed obvious difference among the growing stages, especially after tasseling stage. The forage yield range was from 31.21 to 80.53 T Ha-1. Among all the tested varieties, a total number of 17 (ranking from 1 to 17) varieties of forage production were higher than 50 T/Ha._Combined with agronomic and forage nutritive data obtained from the study, we finally selected 5 varieties (Jilong 369, Xianyu 1580, Xianyu 1692, Jinai 130, 32D22) as the suitable varieties to promote planting in Hohhot.
Effects of Plant Growth Regulators on Fruit Set and Yield of Taiwan Morus macroura
Authors: Ren Jiequn , Zhang Minghai , Chen Li , Li Zhinian , Zheng Zhangyun
Published: December 2020

In recent years, it is a common phenomenon that Taiwan Morus macroura has low fruit set in different mulberry planting areas that occurred popularly in China. This study aims to study the effects of plant growth regulators on fruit set and quality of Taiwan Morus macroura. Field experiments were carried out to investigate ten plant growth regulators, treated with 3 concentration gradients. The result shows that six plant growth regulators had better fruit preservation effect, the yield of mulberry which treated with plant growth regulators were significantly higher than that of control groups. To reserve fruit in fruit mulberry production, 85% 2,4-DNa SP with 400000~600000 dilution, 99.9% Boron fertilizer SL with 1500~2500 dilution, Amino acid soluble fertilizer SP with 35000 dilution, 80% DA-6 SL with 50000 dilution, 0.03% NAA SL with 50000 dilution and 8% Chlorophenoxyacetic acid sodium salt SP with 3000~6000 dilution are the best from the standpoint of food safety and economics.
Purification of letinous edodes polysaccharide and its effect on gel properties of rice starch
Authors: Sun Meiling , Feng Xiaoguang , Chen Liye , Hua Wanyue , Chen Xiangning
Published: December 2020

In this study, lentinan was extracted and purified, and its components were analyzed. The purified letinous edodes polysaccharides were co pasting with rice starch with different contents (1.0%, 3.0%, 5.0%) respectively. The effects of letinous edodes polysaccharides on the gel properties (transparency, solubility, swelling power, freeze-thaw stability, coagulability and in vitro digestibility) of rice starch were studied. The results showed that after purification, the total sugar content of lentinan reached 55%, protein content was about 8%, ash content was very little, and uronic acid content was as high as 19%. With the increase of lentinan content, the transparency, swelling power and solubility of rice starch decreased significantly, and the freeze-thaw stability and sedimentation was improved, and the swelling power and transparency were directly proportional to temperature. At the same time, lentinan can inhibit the hydrolysis and aging of rice starch to a certain extent, and improve its anti digestion ability.
Preparation of antimicrobial peptides from Bacillus subtilis and effect on fresh-cut vegetables
Authors: Zhou Miao , Chang Xiguang , Feng Xiaoguang , Ren Yi , Chen Chichang , Chen Xiangning
Published: December 2020

In order to extend the shelf life of fresh-cut vegetables, the principle of preservation of Bacillus subtilis antimicrobial peptides was discussed. Fresh potatoes, yam and lotus root were used as test materials, and the prepared Bacillus subtilis antimicrobial peptides were used for soaking treatment, soaked in clean water as a control, and stored at 4°C. The sensory quality changes during storage were analyzed and their physiological and biochemical indexes were determined. The results show: compared with the control group, the group treated with Bacillus subtilis antimicrobial peptides had the best sensory quality during storage, significantly inhibited the increase in electrical conductivity, reduced cell membrane damage, and had significant POD and PPO enzyme activities (P < 0.05). The reduction effectively inhibits the proliferation of microorganisms during the storage of fresh-cut vegetables, thereby better maintaining the quality of fresh-cut vegetables and effectively extending their shelf life.
Effects of Different Proportions of Pig Manures and Sugarcane Leaves on Cu and Zn Forms in Dry Fermentation
Authors: Du Jihua , Jiao Jing , Huang Xiaohong , Li Zunxiang , Liu Xin Peng
Published: December 2020

To explore the influence of different proportions of pig manures and sugarcane leaves on Cu and Zn in pig manures, pig manures and sugarcane leaves were used as raw materials to determine the changes of Cu and Zn effectiveness in pig manures under different proportions of pig manures and sugarcane leaves. The results show that under different proportions of pig manures and sugarcane leaves, (1)when the proportion of sugarcane leaves and pig manures was 2:1, it was adverse against the bio-availability of Cu. When the proportion was 1:2, bio-availability form (EX and RED) of Cu decreased significantly. (2) The bio-effective form content is ranked as below in Zn: C (1:2) >B (2:1). When the proportion of sugarcane leaves and pig manures was 1:2, bio-availability form (EX and RED) of Zn was the minimum, only 22.72%, and the passivation effect was good.
Advances in the study of chromogenic agents in meat products
Authors: Zhao Fushi , Chen Xiangning
Published: December 2020

In order to improve the organoleptic properties, edible quality and flavor of meat products, and extend its shelf life, some additives are commonly used to guarantee the color retention of meat products. Nitrate and sodium nitrite are frequently-used chromogenic reagents, but it has been proven that their usage has potential safety risks. Excessive consumption of them can cause carcinogenesis, teratogenesis, and mutation. Therefore, the search for other effective alternatives is imminent, which has become a research hotspot at home and abroad. This paper expounds the problems in the processing of meat products and the mechanism of chromogenic reagents. The effect of chromogenic reagents on the preservation of meat products is also discussed, which provides a reference for further research on meat chromogenic reagents.
Isolation and identification of Morchella pathogenic bacteria and determination of antibacterial activity of 22 essential oils
Authors: Zhang Yongcang , Lu Qiyu , Wang Youmin , Tu Caihong , Liu Lan , Xie Yongdong , Liu Ji
Published: December 2020

To extend the storage period and shelf life of Morchella and reduce environmental pollution problems, in this experiment, pathogenic fungi were isolated and identified from the naturally-occurring Morchella, and the antibacterial activity of 22 kinds of plant essential oils was determined by the plate dilution antibacterial method. The results showed that a strong pathogenic fungus strain YDJ-P was isolated and identified from the naturally-occurring Morchella, and it was identified as Rhizopus stolonifer based on morphology and molecular biology. The antibacterial activity of 22 essential oils showed that the essential oils of Clove, Styrax and Spearmint had obvious inhibitory effect on the strain YDJ-P, and the inhibitory rate was 100 % at a concentration of 1000 μl/L. The bacteriostatic rate of Patchouli, Inula, Oregano, Neroli and Myrrh essential oils against strain YDJ-P were significantly different from that of completely bacteriostatic essential oils (P < 0.01), all >50%.
Research on the Regulatory Mechanism of Trehalose in Mentha Citrata’s Resistance to Drought
Authors: Feng Yingying , Cai Lujuan
Published: December 2020

Simulation of drought stress by 10% polyethylene glycol (PEG-6000) is conducted to measure the indicators of photosynthetic and chlorophyll fluorescence shown by Mentha citrata seedling foliage at different times and in different conditions. The result suggests that drought stress harms the growth of such seedlings, causing a drastic decline in their photosynthesis and pigment content; exogenous trehalose is effective to mitigate the drought-induced decrease in their Pn, maintain the stability of Gs and Tr, and meanwhile reduce the content of Ci; such trehalose can mitigate the drought-induced decrease in Fm, Fv/Fm, Fv/Fo, qP and Y(II) to a certain extent, slow the decrease in Fo, and restore Y(NPQ) to its normal range. Overall, exogenous spraying of trehalose can alleviate the damage that drought stress inflicts on the photosynthesis of Mentha citrata seedlings, maintain a stable photosystem, and enhance such mint’s resistance to drought to some extent.
Efficacy of Butylphthalide Soft Capsules Combined with Shuxuetong Injection in the Treatment of Acute Cerebral Infarction
Authors: Zhang Wentao , Zuo Ping , Wang Feng , Cui Yinglin
Published: December 2020

Objective: To study the clinical effect of butylphthalide soft capsule combined with Shuxuetong injection in the treatment of acute cerebral infarction. Methods: A total of 94 patients with acute cerebral infarction admitted in our hospital from March 2018 to February 2020 were selected and divided into two groups according to the random number table method. The patients in both groups received conventional treatment programs, the control group (n=47) was given Shuxuetong injection, the test group (n=47) was given combination therapy of butylphthalide soft capsules and Shuxuetong injection on the basis of conventional treatment, and compared the efficacy and related indicators of patients in the two groups.

Results: The total effective rate of treatment in the test group was 95.74%, which was significantly higher than that in the control group, which was 80.85%; the NIHSS score in the test group was lower than that in the control group, and the ADL score was higher than that in the control group; the complication rate in the test group was 14.89%, which was significantly lower than the control group’s 40.43%, the difference between the two groups of data is statistically significant (P < 0.05).

Conclusion: For patients with acute cerebral infarction, the use of butylphthalide soft capsules combined with Shuxuetong injection can achieve the desired results, and it has a positive effect on the recovery of nerve function and self-care ability, and it can also reduce the risk of complications. It is a treatment plan that is worth promoting.
Advance on the preparation technology and anti-hyperlipidemia mechanism of phytosterols
Authors: Deng Chuanhan
Published: December 2020

Phytosterols is a kind of natural active substance, which has many physiological functions that beneficial to human body. It can be used as pharmaceutical raw materials and functional food supplements. In recent years, phytosterols have been extensively studied in the prevention of cardiovascular diseases, and a series of research results have been reported. This paper combined the literature recent decades, and introduced the source and distribution, structures and properties of phytosterol, focusing on the preparation technology of phytosterol, including solvent extraction, esterification, distillation, supercritical CO2 extraction, saponification method and microorganism fermentation, and the mechanism of blood lipid lowering function of phytosterols were discussed and summarized. The future research direction was prospected in order to provide the reference for the development and utilization of phytosterols.
Investigation of the impact on the antioxidant capacity and Flavonoids components of different drying methods for Sophora japonica L.
Authors: Wang Yandong , Wang Jiaming , Wang Yingli , Zhang Zemin
Published: December 2020

To develop the optimal drying method for the processing of Sophora japonica L., three approaches including freeze-drying, air-drying and oven drying were investigated. The water contents in dried Sophora flower samples treated using different drying methods were compared. The total amounts of Flavonoids in methanol extracts of dried Sophora flower were measured using UV-vis spectrophotometer, and the amounts of Rutin were measured using High Performance Liquid Chromatography (HPLC). The antioxidant capacity of extract of oven dried Sophora flower was determined by three different antioxidant assays, including measurement of clearance ability for DPPH, clearance ability for free hydroxyl radical and Ferric reducing antioxidant power (FRAP) assay. In our research, freeze-drying method demonstrated a minimal impact on the morphology, color, smell and other features of Sophora flower, and the freeze-dried Sophora flower reserved the highest value of total Flavonoids component amount. However, Sophora flower dried in the oven had the lowest water content and highest Rutin amount. In addition, oven dried Sophora flower could be stored easily and had less loss of the active components. Sophora flower has been demonstrated to be antioxidant in chemical reactions. In the measurement of clearance ability of DPPH, the clearance activity was positively correlated to Sophora flower extract concentration. In terms of clearance ability for free hydroxyl radical, the antioxidant capacity of Sophora flower extract increased with the increase of its concentration in the low concentration range, while after exceeding a certain concentration, clearance activity reduced with the increase of concentration. In FRAP assay, the total antioxidant capacity of Sophora flower extract first decreased as concentration increased when concentration was below 0.2 mg/mL, but then increased with the concentration after exceeding 0.2 mg/mL. In conclusion, oven drying method could be applied in the processing of Sophora flower. Sophora flower possesses good antioxidant capacity and this could be the theoretical basis for using it in the production of health products.
Comparison of weak signal detection performance between chaotic system and FFT
Authors: Wang Yan-Wu , Shi Min , Qian Chao
Published: December 2020

Chaotic system can be used to detect weak signal in strong noise background, but is the detection performance of chaotic system prior to the detection performance of FFT? The signals under the same noise power and the same signal-to-noise ratio are detected by FFT and chaotic detection system, and the detection rate is compared by introducing the concept of detection rate of chaotic system. The results of analysis show that the detection performance of FFT is only related to the signal-to-noise ratio (SNR) with the same signal length and noise power. And the signal can be detected accurately when the SNR is -40dB, but it can’t be detected when the SNR is -60dB and -80dB. The signal can be detected sometimes, sometimes can’t be detected by the chaotic system in the same condition. Therefore, the detection probability of weak signal exists when the weak signal detected by chaotic oscillator.
Research Progress of Green Immunoassay for Mycotoxins
Authors: Qiu Xiaoyan , Liu Renrong
Published: December 2020

Mycotoxin pollution not only causes huge economic losses, but also seriously threatens the health of humans and animals. Immunoassay methods are widely used in the rapid detection of mycotoxins, but the method requires the use of toxin standards and artificial antigens.The artificial antigen synthesis is not only difficult to prepare, but also requires toxin standards as raw materials. Toxin standards are expensive and harmful to the health of producers and operators, which restricts the application and popularization of immunoanalytic methods in mycotoxin detection. If the toxic antigens and standards involving in the immune reaction is substituted with the non-toxic antigen, a green immunology test method can be established to overcome the above deficiencies. Establishing a green, fast, simple and highly sensitive immunoassay method to detect these toxins has become a hot topic in recent years. This paper reviews the application and prospect of green immunoanalysis methods based on anti-unique antibody and phage display techniques inmycotoxins.
II International scientific and practical conference “Actual problems of the energy complex: mining, production, transmission, processing and environmental protection”
Authors: Lutoshkin R V , Morkovkin D E , Sadriddinov M I
Published: December 2020

Within the framework of the presented material, the results of the conducted II International scientific and practical conference “Actual problems of the energy complex: mining, production, transmission, processing and environmental protection”.
Expert system for predicting the state of transformers based on fuzzy logic
Authors: Khlebtsov A P , Rybakov I A , Svishchev N D , Shilin A N
Published: December 2020

The article examines methods for monitoring the operation of oil-filled transformers and identifies methods for evaluating the state of the transformer using a fuzzy logic device. Solutions for remote analysis of transformer operation have been formed. The methods that were used for diagnostics are presented. Conclusions are drawn on which equipment is more effective for diagnostics of power transformers.
Influence of capacity, distance from arcs to walls on the efficiency of arcs and electricity consumption in arc steel-making furnaces
Authors: Makarov A N
Published: December 2020

The influence of the distance from the arc to the walls in the entire range of arc steel-making furnaces with a capacity from 0.5 to 120 tons on the efficiency of arcs and specific power consumption in the furnaces was investigated. In low-tonnage arc steel-making furnaces, the arcs are close to the walls and the efficiency of the arcs is small and amounts to 30-35%, and the specific power consumption for melting is 650 kWh/t. In heavy-duty steel-arc furnaces, the arcs are located far from the walls, the efficiency of the arcs is 46-49% in the absence of a slag layer, and the specific energy consumption for melting is 375-385 kWh/t.
Heat supply efficiency improvement in the Arctic regions with an increased wind potency
Authors: Bezhan A V
Published: December 2020

Arctic regions are known to be characterized by a situation when the cash costs associated with the heat power production for heat supply overshoot the heat power tariff. Therefore, part of the financial burden placed on the government by way of subsidizing the fossil fuel purchase and delivery to the settlements of the Arctic regions. Through the example the Tsypnavolok settlement, which is located in one of such regions, wind power plants using for heat supply are shown to be considered as a measure to reduce the government financial burdens. For Tsypnavolok the cost of power produced by the wind power plant revealed by calculations is amount to 67.02 USD/Gcal. This is not so many as the average heat tariff (67.9 USD/Gcal). At such heat supply indexes, wind power plants are not only to reduce the government financial burdens, but also to bring an extra income.
Mode of "small" signal of the mathematical model of an electric multipole with memresistive branches under conditions of interval uncertainty
Authors: Bondarev A V , Efanov V N
Published: December 2020

In this article, a mathematical model of an electric multipole with memresistive branches is developed when operating under conditions of interval uncertainty in the mode of a small signal on alternating current.
Static mode of the mathematical model of an electric multipole with memresistive branches in conditions of interval uncertainty
Authors: Bondarev A V , Efanov V N
Published: December 2020

This article discusses a method for obtaining a mathematical model of an electric multipole with memresistive branches in finite parameter increments for a large signal mode when calculating a direct current based on a generalized model obtained earlier. A computational algorithm for calculating nanoelectronic circuits based on methods of interval arithmetic is also given.
Ontology of experiment planning for obtaining a probabilistic model of single-phase electricity consumers
Authors: Mokhov V A , Shaikhutdinov D V , Kruglova T N , Oganyan R G , Tkachev A N
Published: December 2020

The paper presents the rationale and the problem of forming a probabilistic model of single-phase electricity consumers. To solve the problem, the corresponding mathematical apparatus is stated and the ontology of experiment planning is developed. The applicability of the prepared ontology was demonstrated on a specific example of an open dataset from the Intelligent Systems Subcommittee (ISS) IEEE. At the same time, the authors identified the characteristic modes of energy consumption for a particular residential building and data sets for direct construction of a probabilistic model of single-phase electricity consumers with total data loss caused by filtering less than 10%.
Identification of the root causes of accidents at hazardous production facilities of the fuel and energy complex
Authors: Alekseeva A V , Volokhina A T , Glebova E V
Published: December 2020

The article presents the results of the analysis of statistical data on accidents at the facilities of the main pipeline gas transportation for the period from 2008 to 2018. It has been established that the dynamics of accident rates has a cyclical wave-like character. In the course of analyzing information on accidents that occurred during the study period, groups of the main causes of accidents in the main pipeline gas transportation were identified. In addition, in the course of the study, the nature of the occurrence of stress corrosion cracking was studied in detail, and the root factors that led to the occurrence of accidents for this reason were identified. With the help of regression analysis, a functional relationship was established between the number of accidents due to corrosion destruction and hidden defects, which included defects of the pipe manufacturer and defects in construction and installation works.
Features and problems of environmental pollution from decentralized heating systems (on the example of Chita)
Authors: Rikker Yu O , Kobylkin M V
Published: December 2020

This article is devoted to the study of the environmental load of decentralized energy facilities using the example of furnace heating in Chita. Existing residential and non-residential buildings heated with household stoves and low-power boilers increase the environmental burden on the environment. There are tendencies to switch to long-burning boilers. An analytical assessment of the change in the amount of emissions of the main pollutants when changing the operating modes of boilers is presented. Mechanisms for solving problems are proposed.
Market and consumption of oil in China in the first half of 2020: preliminary review
Authors: Sharipov F F , Timofeev O A
Published: December 2020

China’s oil consumption in 2020 faced multifaceted impact of numerous factors, namely COVID-19 global spread, decrease of industrial production and hydrocarbon consumption, global consumption market shrinking etc. Power production is set as one of the sectors, most crucial for implementation two-stage plan for China’s socialist modernization by 2050. This strategy’s major task is decreasing of coal overwhelming consumption in favor of hydrocarbons. Importing three-quarters of consumed oil, China forms leading trends in global oil transportation, par excellence, for its leading partners: Russia, Saudi Arabia, and Iran. 2020’ decrease in oil consumption has had negative impact not only on energy sector per se, but also simultaneously on the wide spectrum of industrial production on a par with transportation, for example, coastal port logistics. Nevertheless, both upstream and downstream oil sectors could rebound post-COVID fast recovery in coming months, which helps to avoid endangering China’s long-term plans of development.
Prospects for projects of the liquefied natural gas production
Authors: Kharitonova N A , Pulyaeva V N , Kharitonova E N
Published: December 2020

This research paper examines the current state of the liquefied natural gas industry in Russia, the goals set in the Energy Strategy, as well as the prospects for the development of LNG projects within the framework of market instability, the use of new technologies in the production of liquefied gas. Also the authors assess the competitiveness of these projects. Based on the results of the analytical study, conclusions were formulated. The work can be of value to practitioners and researchers in the industry.
Development of a technology for non-reagent deironing of water for power facilities
Authors: Kurbatov A Yu , Kuzin E N , Averina Yu M , Vetrova M A
Published: December 2020

As part of the study of the possibility of using hydrodynamic water treatment for preliminary deferrization of artesian water before feeding it to a deep osmotic treatment unit. It was found that in the process of water treatment in a hydrodynamic device with constant air ejection, the complete oxidation of iron (II) compounds occurs. The influence of the volume of consumed air and the number of processing cycles on the efficiency of the deferrization process has been studied. Data were obtained on the distribution (size / ratio) of air bubbles in the fluid flow during its hydrodynamic treatment. Based on the results obtained, it was concluded that when hydrodynamic treatment is combined with ceramic ultra filtration membranes, the iron removal rate is 99%, while hardness salts, hydrogen sulfide and other pollutants are partially removed from the water, and complete disinfection occurs.