bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Investment Efficiency Evaluation of Wind Power Projects under Supply-side Reform
Authors: Wang Li , Liang Junxia , Liu Jinpeng
Published: July 2020

In recent years, China’s wind power has developed rapidly, with increasing installed capacity, and it is gradually entering a stage of large-scale development, which has broad potential for future development. However, China’s wind power investment projects have low investment efficiency, which is not conducive to the healthy development of the wind power industry. Therefore, improving the overall investment efficiency of wind power projects is an inevitable direction for the development of wind power companies in the future. This paper first takes wind power projects as research objects, combines the characteristics of wind power projects, and constructs a suitable comprehensive investment efficiency evaluation model based on DEA theory. Then it conducts an empirical analysis based on the development status of power enterprises in Xinjiang of China, and combines the evaluation conclusions to promote wind suggestions on the development of investment efficiency in power generation projects.
Diagnosis and assessment of black and odourous water and a comprehensive strategy for urban areas
Authors: Yu Huiqing , Shi Guijun , Yin Jing , Shan Yongti
Published: July 2020

To fundamentally solve the problems associated with black and odourous water pollution in Chinese urban areas, the Xixiang River and the Xianshui Surge were selected to diagnose and assess the pollution characteristics of black and odourous water. Based on the results, a comprehensive strategy with a scientific basis was proposed for the improvement of Chinese urban water quality.
The Approaches from Rural Construction Land Consolidation to Sustainable Rural Land Resource Development
Authors: Zhang Yiye , Zhang Zaisheng , Sun Xuesong
Published: July 2020

As an important property, rural construction land is related to the fundamental interests of farmers. Since rural construction land has not been efficiently used which affected the sustainable development of rural land resources, this study constructs a theoretical model of farmers’ rural construction land consolidation intention, and designs a questionnaire based on the model. Based on the data analysis, this study provides empirical test and puts forward suggestions for improving present rural construction land management policy system.
The management practice and its experience for the collection and treatment of waste home appliances in Taiwan, China
Authors: Xiang Ning
Published: July 2020

The collection and treatment of waste home appliances (WHAs) is a challenging issue in both academia and practice today. In the 1980s, a WHAs collection and treatment industry dominated by spontaneous market emerged in Taiwan, China, which was featured by small-scale, scattered and unregulated treatment activities, causing serious environmental pollution and health damage. Taiwan authorities have vigorously strengthened the industrial supervision and guidance, and basically curbed such simple treatment activities by the beginning of the 21st century. Focusing on the “Resource Recycling Fund” system implemented by Taiwan, this paper systematically introduces the management measures and implementation effect in WHAs collection and treatment industry in Taiwan, with a view to providing a reference for improving the WHAs management in Mainland China. It is argued that the success of WHAs management in Taiwan attributes to the following three important factors: (1) with the awakening of public consciousness on environmental protection and the gradual improvement of the rule of law, a solid environmental supervision system has been formed; (2) due to the improvement in the economic development in Taiwan and the rising labour costs, the labour-intensive simple treatment operations become unprofitable; (3) a long-standing pricing mechanism for WHAs collection and treatment has been established through the implementation of “Resource Recycling Fund” system.
Investigation into the positive effects of wind deflectors on natural draft wet cooling towers under crosswinds
Authors: Chen Youliang , Cheng Shi , Zi Pingyang , Liu Zhongyuan , Fan Rong
Published: July 2020

In order to reduce the adverse effects of crosswinds on the intake air of natural draft counter-flow wet cooling towers, a new method of optimizing the air intake was introduced, that is installing wind deflectors in the circumferential direction of the air inlet, and for quantitative analysis of the uniformity of the circumferential air intake of the cooling tower, the air inlet uniformity factor was defined. Based on the thermal model experiment, the effect of installing the wind deflector on the inlet air and thermal performance of the wet cooling tower is studied under crosswind conditions. Through the comparative analysis of the air intake performance and cooling efficiency, two fundamental reasons for the influence of cross wind on the cooling performance are revealed: crosswinds not only reduce the amount of ventilation, but also destroy the uniformity of the circumferential air intake of the cooling tower. After installing the wind deflector to optimize the circumferential air intake, the ventilation volume is increased, the air intake uniformity coefficient is also greatly improved, the heat and mass transfer uniformity in the tower is enhanced, and the cooling efficiency is greatly improved.
Research Status and Prospects of Key Technologies for Underground Water-sealed Oil Storage Cave
Authors: Dou Ming-Yuan , Zou Shuai , Li Hao-Ming , Feng Qing , Huang Fu-Chuan , Liao Xiao-Hua
Published: July 2020

Petroleum is the lifeblood of the national economy. The underground water-sealed oil storage cave has become the main development direction and research object of petroleum reserve at home and abroad due to its advantages. This paper summarizes the research progress of key technologies for large-scale underground water-sealed oil storage cave, emphasizes the current role of underground water-sealed oil storage cave in petroleum reserve, and discusses water curtain system and water sealing, surrounding rock permeability and evaluation, surrounding rock stability and evaluation, field construction technology and related issues, and also emphasizes the importance of strategic petroleum reserve(SPR), and has prospects to the future development of underground water-sealed oil storage cave.
Evaluation Of Soil Ecological Benefits Of Japonica Rice In Southern Liaoning Based On AHP And Energy Analysis
Authors: Jin Zhongyu , Sun Yizhe , Yang Ping
Published: July 2020

In this paper, the ecological benefit evaluation of Panjin japonica rice in south Liaoning was carried out. Based on the Analytic Hierarchy Process (AHP) and energy value analysis, the ecological benefits of japonica rice soil were evaluated from the aspects of organic matter, alkali-hydrolyzed nitrogen, rapidly available potassium and rapidly available phosphorus. The results show that the comprehensive evaluation index of soil is stable when the integrated technology is used to achieve the purpose of increasing yield and efficiency. It indicates that the ecological benefit evaluation method proposed in this paper is an effective and scientific method, which can be used for soil ecological benefit evaluation and has a profound significance for land ecological research.
Combined process of biofilm+roots for aquaculture wastewater remediation
Authors: Chen Tongsheng , Yang Jing , Huang Baoyuan , Liu Weimin , Lu Cuiyun
Published: July 2020

The mechanism of aquaculture wastewater remediation by combined process of biofilm+roots was studied based on the aquaculture circulatory system. Results showed that under the remediation system, the removal of COD,TP,NH4-N,TN were 84.59%,57.81%,82.43%and70.96%, respectively. The controllable wastewater treatment which is the coupling of biofilm and roots, was effective and could provide basis and technical support for the implementation of aquaculture wastewater treatment.
Three-dimensional Stability Analysis of Considering Seepage Effect on Complex Loose Slope
Authors: Wang Sha , Xie Xuyang , Mei Guodong , Lu Xinqi , Li Kun , Wang Yali
Published: July 2020

in order to analyze the influence of seepage on the stability of loose accumulation slope, this paper establishes a three-dimensional slope stress calculation model based on practical engineering cases, carries out the seepage stress coupling analysis, designs three analysis conditions, and studies the influence of seepage and tailings pressure on the stability of slope. The results show that the tailings pressure will strengthen the safety factor of slope stability, but the seepage will reduce the safety factor of slope stability. The influence degree of seepage on slope stability is revealed, which provides a reference for the design of loose slope.
Analysis on Influence of Tailing Pond Construction on Stability of Surrounding Loose Waste Dump
Authors: Wang Sha , Mei Guodong , Xie Xuyang , Cui Yiyuan
Published: July 2020

Tailing pond is one of the important facilities of mine production, which is used to stack the tailing waste discharged by the concentration plant. China’s mines produce more than 300 million tons of tailing every year, and the amount of tailing discharged is huge. Due to the limitation of land resources, tailing pond location will face more and more challenges. In this paper, the scheme of building tailing pond on the loose deposits is studied, and the influence of the load produced by the new tailing pond on the stability of the loose yards is analyzed. According to the analysis conclusion, tailing pond is built on the loose yards, and the accumulation of tailing is beneficial to the stability of the slope of the loose yards. However, if strict anti-seepage measures are not taken, the infiltration of pond water into the slope will reduce the stability of the slope, but in general, it is still greater than the safety factor of its own stability.
Analysis of Hydraulic Failure Mechanism of River Bank Protection and Reinforcement Treatment Practice
Authors: Luo Shijiao
Published: July 2020

Based on the reinforcement engineering of the revetment retaining walls at the lower reaches of a reservoir, this study analyzes the fracturing mechanism and proposed technically-advanced, economical and feasible reinforcement measures, which provide important reference for similar engineering work.
The storm activities in the West Pacific from 1980 to 2018
Authors: Chen Siwen
Published: July 2020

The storm is an important weather system that significantly affects socioeconomics and human living. This study uses the global tropical cyclone best track data from IBTrACS, along with other meteorological states from ECMWF ERA-5 reanalysis from 1980 to 2018. In the West Pacific, storms are more likely to occur in summer (July, August and September). During the 39-year period, the occurrence of storm activities tends to be less frequent in summer, accompanied by increased sea surface temperature, total precipitation and total column water. It is also found that the storm number exhibited a high correlation with sea surface temperature, surface pressure, total precipitation and total column water in the middle West Pacific as well as the sea of Okhotsk in summer.
The research and application on calculation method of design flood in small basin
Authors: Zhang Fahong , Guo Jing , Yue Qinghua , Guo Jiali
Published: July 2020

The flood in small basin specializes in quick confluence, high peak value, hard to forecast and serious destruction effect, and once the flood disaster happens. It will put a great threat to the safety of the lives and properties of the resident alongside the river. Rational determination of design flood peak is crucial to the determination of scale, safety and benefit of the projects such as regulation of small basin, river renovation, danger eliminating and reinforcement of dangerous reservoirs and so on. Most of the small basins in China either lack gauged flood data or the catchment area of the project is quite different from the catchment area of the hydro-station, while the rainfall (metrological) data within this basin is relatively abundant. So, rational utilizing available gauged flood data to calculate the design flood of the project place whose catchment area is quite different from the hydro-station’s and utilizing available rainfall data to figure out the design flood are becoming particularly important. The rational method, (comprehensive) instantaneous unit hydrograph, hydrologic analogy, regional comprehensive method, experience formula and some other often-used methods which are often used in the flood calculation of small basin are systematically introduced in this paper. Taking Tingxi Basin in Fujian Province as an example, the above mentioned methods are applied and verified in the four places of Zaoshui hydro-station (10.5km2), Lower dam basin of Xiamen pumping storage power station (12.1km2), Wufeng hydro-station (50.1km2), and Tingxi Water Reservoir (100.8km2), the rationality of the results are analyzed, and the difference of those methods are compared in this paper. On the basis of these things, the application scope and condition of these methods are concluded, and a set of design flood calculation methods of small basin are relatively systematically summarized.
Precipitation Sequence Analysis of Representative Stations in Shandong Province from 1956 to 2016
Authors: Chen Yi , Niu Jin-Qiu , Chen Gan-Qin , Wang Jun , Cao Sheng-Le
Published: July 2020

Based on the monthly precipitation observation data of 17 hydrological representative stations in Shandong Province from 1956 to 2016, Moving-average method, Mann-Kendall test method, precipitation concentration degree and concentration period were used to comprehensively study the distribution characteristics of precipitation in Shandong. The results show that in terms of inter-annual changes, the annual precipitation in Shandong province shows a declining trend, and the precipitation in coastal areas is generally larger than that in inland areas. Judging from the annual distribution, the precipitation in Shandong during the flood season shows a downward trend, and the non-flood season precipitation shows an upward trend. From 1956 to 2016, the precipitation concentration degree and the precipitation concentration period in Shandong Province showed a weak decline.
Analysis of spatial distribution characteristics of virtual water content of maize in China
Authors: Hou Shan , Guan Jinxin , Jin Chenhong , Wang Bo , Zhang Lijia
Published: July 2020

Research on virtual water content of crops can provide the basis for agricultural water resources management; help to improve the efficiency of agricultural water use. Maize is one of the most important food crop in China and also one of the largest water consumers, so it is important to study the virtual water content (VWC) of maize and the spatial distribution characteristics of the VWC of maize in China. In this paper, we assessed the VWC of maize in China including green, blue, grey water and analyze the spatial distribution characteristics of the VWC of maize of 30 regions of China. The percentages of green, blue, and grey water in the total VWC of maize in China were 47.5%, 18.9%, and 33.6%. The total VWC of maize generally showed a three-tiered distribution, and decreased from southeast to northwest. For the country as a whole the green water is the most important contributor. The percentage of grey water of maize was much larger than blue water. Blue water occupied the smallest component of the total virtual water content of maize.
Study on the Remediation of Phorate in Soil by Microbial Consortia
Authors: Yu Xiyang , Li Zheng , Gu Guizhou
Published: July 2020

In order to bioremediating of phorate contaminated soil by microbial consortia, three degrading bacteria in different combinations were inoculated into the phorate contaminated soil. The residual phorate and its metabolites were determined. The results showed that in 42 days the degradation rates of phorate by any two bacteria (Brevibacterium frigoritolerans +Bacillus aerophilus, Bacillus aerophilus +Pseudomonas fulva and Brevibacterium frigoritolerans +Pseudomonas fulva) were 94.09%, 97.15% and 97.42%, respectively. However the degradation rate of phorate by three bacteria was 98.31%. The microbial consortia consisted of three degrading bacteria had the lowest content of phorate sulfone and phorate sulfoxide in soil. Therefore, the microbial consortia consisted of three degrading bacteria could significantly reduce the residual phorate and its metabolites in soil.
Study and Application of Gneiss in Preparation of Graded Gravel Base Material
Authors: Zhao Xiaodong , Yu Xinjie , Tang Xiaoliang , Li Rongxu
Published: July 2020

Because a lot of abandoned tunnel slag is produced in road engineering construction and the using rate is low, based on the Shijiazhuang section of the Xifu section of the Taihang mountain highway, the lithology of abandoned tunnel slag is analyzed. Its physical and mechanical properties are evaluated by laboratory tests, and its feasibility as an aggregate of graded gravel base is demonstrated. The gradation of the crushed stone mixture is composed of fine aggregate limestone mixed with abandoned tunnel gneiss, and the related characteristics are studied. The results show that the strength of the mixture could be significantly improved by replacing the fine aggregate with limestone, and the California load ratio (CBR) value of the crushed stone mixture with 0~3 mm and 3~5 mm limestone could reach 377.2%, and the unconfined compressive strength could reach 1.2 MPa.
A Brief Introduction on the Research Status and Future Prospects on Geopolymer Concrete
Authors: Fan Xiaokun
Published: July 2020

With the development of science and technology and the improvement of people’s living standards, air pollution as the main environmental problem has become increasingly prominent. Promoted by economy and technology, architecture is not only to satisfy people’s living needs, but also to integrate building functions and user experience. This leads to building energy consumption increasing, which is in line with industry and transportation, becoming the world’s major energy consumers. In the tide of sustainable development and green building, energy saving, consumption reduction, green and health have become the common pursuit of architecture. However, in the process of production and construction, the formation and release of CO2 during the calcination of ordinary Portland cement raw materials has resulted in an increase in carbon emissions. Therefore, the traditional cement materials have gradually failed to meet the concept of green building because of its high pollution and energy consumption in production. With more and more stringent restrictions on pollutant emission in various countries, the environmental cost of cement production will be higher and higher. Continuously increasing environmental costs have forced major enterprises to invest a large amount of cost in energy saving and environmental protection of products. Geopolymer concrete has also developed rapidly. With the unremitting efforts of scholars at home and abroad, after nearly 40 years of development, as a new type of green building material, geopolymer concrete has undergone a transformation from metakaolin to industrial solid waste as raw materials, with low energy consumption, low carbon emissions, easy preparation, and excellent compressive and flexural strength, acid-alkali corrosion resistance, shrinkage and expansion rate, quick drying, quick hardening and durability. In contrast, it is one of the best substitutes for ordinary Portland cement-based materials. It has broad application prospects in the fields of construction, materials, military, nuclear and other fields, and has been preliminarily applied. This paper reviews the research progress of geopolymer concrete at home and abroad, summarizes the development of raw material composition, manufacturing technology, performance and application prospects, and puts forward the problems faced by geopolymer concrete technology.
Effectively degradation of trace cytostatic drug capecitabine in water using porous Ti/SnO2-Sb/Ce-PbO2 as a reactive electrochemical membrane
Authors: Xu Lei , Ma Xiao , Wu Jinhua
Published: July 2020

The electrochemical degradation kinetics of trace cytostatic drug capecitabine (CAP) at a concentration of 10 μg/L were investigated with a porous flow-through membrane anode. Electrochemical degradation of trace CAP followed the pseudo-first-order reaction kinetics. The kinetic rate constant (k) of 0.111 min−1 was found under optimal conditions. Higher current density and Cl− concentration benefited CAP degradation. The reactive electrochemical membrane was proved to be effective for the degradation of trace CAP in water.
Ultrasonic extraction of anthraquinone from walnut green husk
Authors: Ma Dongshuo , Hao Yu , Li Xiaoyan , Zhang Wenyu , Wang Xiaoyue , Pang Meixia , Wang Fang , Qi Jinghua
Published: July 2020

Anthraquinone is the main component of walnut green husk. In order to measure the content of anthraquinone from walnut green husk, ethanol extraction with assisted 40 kHz ultrasonic and ultraviolet spectrophotometer method were used in this study. The extracting effect of anthraquinone by ultrasonic wave and its influenced factors were studied. The best extracting scheme and process parameters were discussed. The different extracting conditions for anthraquinone were studied. The results showed that the extracting rate of anthraquinone was related to ethanol concentration, ultrasonic time, extracting temperature and other factors. The effect of different factors on the extraction of anthraquinone was as follows: extracting temperature > ultrasonic time > ethanol concentration. According to experiments, the best extracting parameters were temperature (60 °C), ethanol concentration (70%), ultrasonic time (30 minutes). The anthraquinone content could reach 5.7 mg/g.
Electrochemical degradation of aqueous bisphenol A using Ti/SnO2-Sb/Ce-PbO2 anode
Authors: Xu Lei , Qian Xubin , Wu Jinhua
Published: July 2020

The electrochemical degradation kinetics and energy consumption of aqueous bisphenol A (BPA) were investigated using Ti/SnO2-Sb/Ce-PbO2 anode. The electrochemical degradation of BPA followed the pseudo-first-order kinetics. Different influence factors, i.e. current density, BPA initial concentration and Na2SO4 concentration, on the degradation kinetics and energy consumption were evaluated. The optimal degradation kinetic rate and energy consumption were 0.067 min−1 and 9.96 Wh/L, respectively. Electrochemical oxidation process was effective in the degradation of aqueous BPA.
Research Progress in Treatment of VOCs by Dielectric Barrier Plasma Cooperating Catalyst
Authors: Du Zhehua , Lin Xin
Published: July 2020

Volatile organic compounds (VOCs) are an important component of air pollutants. As a new technology, low temperature plasma technology has the advantages of low cost, simple structure, and wide applicability in processing VOCs. It has attracted widespread attention from scholars at home and abroad in recent years. VOCs components in industrial flue gas are often very complex and the degree of degradation is different. Therefore, in the laboratory simulation, it is necessary to increase the components of simulated exhaust gas and develop a dielectric barrier plasma co-catalysis technology that can deal with multiple components. The removal rate of VOCs is positively related to the discharge voltage and energy density of the reactor. The higher the voltage, the higher the removal rate. But it is accompanied by the increase in the production of NOx, O3 and other byproducts. The type of medium has a great influence on the removal effect of VOCs. The cooperative catalytic removal of VOCs by dielectric barrier plasma is a complex physico-chemical process, and the current research on the reaction mechanism is incomplete.
Multi-component Gas Photoacoustic Detection
Authors: Yun Yuxin , Jiang Qiang
Published: July 2020

Based on the basic principles of photoacoustic spectrometry, this paper uses methane and acetylene as examples to conduct a research for the multi-component gas photoacoustic detection. The photoacoustic spectrometer designed in this paper has the advantages of good selectivity and large detection range, and the proposed multi-component gas photoacoustic quantification method based on least squares regression does not require cell constants and gas absorption coefficient parameters, thus avoiding errors introduced by these parameters. The method proposed in this paper provides a method reference for the engineering application of photoacoustic spectrometry.
The preparation of Fe-doped carbon aerogels from sodium alginate
Authors: Zhai Zuozhao , Ren Bin , Xu Yuelong , Wang Shasha , Zhang Lihui , Liu Zhenfa
Published: July 2020

In this article, Fe-doped carbon aerogels were prepared by one-step carbonization using sodium alginate as the raw material. The composition of the materials was characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that when the carbonization temperature is lower than 700 °C, iron mainly exists in the form of Fe3O4. When the carbonization temperature is higher than 700 °C, iron mainly exists in the form of Fe and CFe15.1.
Isolation and identification of endophytic fungi in walnut
Authors: Wang Xiaoyue , Li Kehang , Han Mengmeng , Zhang Wenyu , Li Xiaoyan , Ma Dongshuo , Wang Fang , Pang Meixia , Qi Jinghua
Published: July 2020

In this paper, endophytic fungi in four tissues (roots, branches, leaves, fruits) of walnuts were isolated by tissue isolation technic. Based on morphology, the isolated endophytic fungi were preliminarily identified. The results showed that 64 strains of endophytic fungi were isolated from walnut tissues. The number of endophytic fungi isolated from walnut branch tissues is the largest, followed by leaf, fruit, and root tissues. Observing the morphological and mycelial changes during fungal growth and the characteristics of spore morphology under the microscope, 64 strains of endophytic fungi belonged to 17 genera, of which Alternaria sp. was the dominant microflora. For the first time, Talaromyces sp., Curvularia sp. and Eurotium sp. were isolated from walnut plants.
Determination of biogenic amines in Shanlan liquor by HPLC
Authors: Qi Ningli , Qiu Chuyuan , Li Pei , Ye Jianzhi , Chen Wuhai , Yang Chunliang
Published: July 2020

A survey of biogenic amine species and content of traditional Chinese Li Nationality Shanlan liquor was carried out. Eight major biogenic amines including histamine, cadaverine, tryptamine, putrescine, tyramine, phenylethylamine, spermidine and spermine were separated by reversed-phase HPLC-DAD on Inertsil ODS-SP column after pre-column derivatisation with dansyl chloride. The results showed the eight biogenic amines were not distributed in Shanlan liquor, and the content and type of biogenic amines in different Shanlan liquors were different. Overall, total content of biogenic amines ranging from 1.02 to 38.42 μg/g were within the safe level for human health.
Analytic studies of marine atmospheric corrosion based on multiphysics simulation
Authors: Chen Jianru , Liu Yan , Zhang Tao , Wei Meirong
Published: July 2020

Because the environment at sea is more severe than inland, the corrosion of hull and ship equipment is extremely serious. It can be said that corrosion is one of the biggest factors affecting the life of ships. The cost of anti-corrosion for ships every year is one third or more of the total maintenance cost. The Marine atmosphere corrosion simulation of Q235 carbon steel is realized by Multiphysics simulation software. Due to the high probability and hazard of electrochemical corrosion in oceanic and atmospheric environment, this paper mainly analyzes electrochemical corrosion behavior and its influencing factors, providing a theoretical basis for monitoring and reducing corrosion hazards. The results show that the corrosion rate of Q235 steel in the oceanic atmosphere is 400 to 600 μm/a, and the corrosion rate is affected by temperature, humidity, limiting current density and other factors.
Study on the adsorption of phosphate in water by La-modified cellulose
Authors: Jiang Husheng , Tang Jie , Zhang Shuyuan , Nan Ning
Published: July 2020

In this experiment, cellulose microspheres were prepared by hydration at high temperature and impregnation with lanthanum chloride solution. The surface morphology and structural characteristics of the modified biomass were analyzed by SEM, XRD and IR. In addition, the adsorption capacity of La-modified cellulose to phosphate in water at different pH and initial concentration had been studied, and the acid condition was more favourable for phosphate removal.
Research on the Mechanism of Simultaneous and Efficient Removal of Ammonia, NO3
−-N and TN in the Coking Wastewater
Authors: Dong Chunjuan , Qingye Pan , Yaquan Sun
Published: July 2020

Through the sequential-recirculation and cross-recirculation ways, the two-stage micro-aerobic EGSB reactor system was operated to treat the actual coking wastewater. And the removal efficiencies of SCN−-N, CN−-N, NH3-N, NO3
−-N and TN in coking wastewater were investigated, and then the mechanism of simultaneous and efficient removal of NH3-N, NO3
−-N and TN in coking wastewater was also analyzed. The results showed that, using the two-stage micro-aerobic EGSB reactor to treating actual coking wastewater, for the sequential recirculation way and the cross-recirculation way, the removal efficiencies of SCN−-N, CN−-N, NH3-N, NO3
−-N, TN were 98.0%, 91.5%, 81.3%, 30.4%, 24.5% and 97.3%, 97.0%, 92.7%, 92.0%, 70.9%, respectively. And the two-stage micro-aerobic EGSB reactor system could achieve simultaneous and efficient removal of ammonia and TN in the coking wastewater through the cross-recirculation way. For the sequential recirculation two-stage micro-aerobic EGSB reactor system, high SCN−-N and NO3
−-N removal of 94.2% and 90.8% was accomplished in the EGSBI, and high NH3-N removal of 89.8% could attain in the EGSBII. However, high NO3
−-N accumulation in the EGSBII also caused very low TN removal of 24.5% for the two-stage micro-aerobic EGSB reactor system. High SCN−-N removal in the EGSBI could ensure high NH3-N removal in the EGSBII. More importantly, the EGSBI had a very strong ability to support SCN−-N shock. For the cross-recirculation two-stage micro-aerobic EGSB reactor system, the EGSBI could keep simultaneous and efficient removal of SCN−-N, CN−-N, NH3-N, NO3
−-N and TN (93.5%, 92.4%, 84.1%, 92.0% and 73.7%). When using sequential recirculation way, thiocyanate-degrading bacteria could form competitive inhibition to ammonia oxidizing bacteria in the EGSBI, and thus, simultaneous and efficient removal of SCN−-N and NH3-N could not accomplish in the EGSBI. High concentration NO3
−-N in the EGSBI was removed mainly through denitrification. However, through the cross-recirculation way for the two-stage micro-aerobic EGSB reactor system, the effluent recirculation of the EGSBI and/or the EGSBII were changed from simple high NH3-N to mixed recirculation of high NH3-N+high NO3
−-N and/or from high NO3
−-N to high NH3-N+high NO3
−-N, respectively. Consequently, thiocyanate-degrading bacteria, denitrifying bacteria and anammox bacteria could keep high activity at the same time and also the effective coupling of denitrification and anammox bacteria was realized in the EGSBI and EGSBII, and which ensured the simultaneous and efficient removal of SCN−-N, NH3-N and NO3
−-N in the EGSBI and EGSBII, and finally realized the simultaneous and efficient removal of NH3-N, NO3
−-N and TN in the two-stage micro-aerobic EGSB reactor system.
Adsorption kinetics and isothermal adsorption model of crystal violet on modified red mud
Authors: Li Wei , Luo Shuwen , Ma Hongfei , Yi Fanghua , Li Zheng , Guo Wenmiao , Han Qiuju , Yao Xiuqing
Published: July 2020

The adsorption of crystal violet on red mud modified by sodium dodecylbenzene sulfonate (SDBS) was studied. The effect of the dosage of modified red mud on crystal violet adsorption was investigated. The results of kinetics and thermodynamics experiments showed that the adsorption of crystal violet by adsorbent fitted with the pseudo-second-order adsorption kinetic model better. The adsorption of crystal violet on modified red mud could be described by Langmuir and Freundlich models, and the adsorption was better in accordance with Freundlich isothermal adsorption model. According to the Langmuir adsorption model, the maximum adsorption capacity of adsorbent was 38.16mg/g at 303K.
Antibacterial effect of flavonoids in castanea mollissima blume on common spoilage bacteria in low-temperature meat products
Authors: Zhang Wenyu , Wu Zhumeng , Wang Xiaoyue , Li Xiaoyan , Ma Dongshuo , Wang Fang , Qi Jinghua , Pang Meixia
Published: July 2020

The oxford cup method and filter paper method were used to determine the antibacterial effect of flavonoids extracted from castanea mollissima blume, three kinds of common spoilage bacteria in low-temperature meat products were subjects to be tested, named proteus, macrococcus and bacillus. The results showed that flavonoids in castanea mollissima blume had an antibacterial effect on proteus and macrococcus. For flavonoid glycosides, the diameters of inhibition zone were 16.32 mm and 17.76 mm, and the minimum inhibitory concentration were 0.00625 g/mL and 0.0125 g/mL, respectively. The effective inhibitory time was 14 h. For free flavonoids, the maximum diameter of the inhibition zone was 7 mm, the minimum inhibitory concentration was 0.0125 g/mL. They had no antibacterial effect on bacillus. As natural bacteriostatic agents, the flavonoids in castanea mollissima blume are likely to have many important applications in meat products in the future.
Study on the adsorption of crystal violet on red mud modified by sodium dodecylbenzene sulfonate (SDBS)
Authors: Ma Hongfei , Wang Rong , Li Wei , Yi Fanghua , Li Zheng , Li Judi , Han Qiuju , Yao Xiuqing
Published: July 2020

In this paper, different modifiers were used to modify red mud and adsorb crystal violet. The results showed that the red mud modified by sodium dodecylbenzene sulfonate had a better adsorption effect on crystal violet. The effects of adsorption time, pH value, initial concentration of crystal violet and salt ion on the adsorption of crystal violet on modified red mud were studied, respectively. 120 min was selected as the adsorption shock time. The results showed that the basic condition was more favourable to crystal violet adsorption, and the addition of salt ions was not conducive to crystal violet adsorption.
Combustion behavior of mineral insulating oil with addition of flame retardants
Authors: Huang Ying , Wei Jiaqiang , Yi Jianxing
Published: July 2020

Mineral oil is the most commonly used liquid insulating material in oil-immersed transformer. Improving the fire performance of mineral oil can not only greatly reduce the probability of fire in transformer system, but also reduce the risk of fire. In this paper, the flash point tester, cone calorimeter and thermogravimetric analyzer were used to study and analyze the mineral oil and modified samples. The results show that the fire resistance and thermal performance of the modified insulating oil are improved.
Performance of anaerobic denitrifying upflow anaerobic sludge bed bioreactor (AD-UASB)
Authors: Wang Jundan , Ji Junyuan
Published: July 2020

Nitrate-containing wastewater has a severely negative impact on the ecological environment, and anaerobic denitrification process is promising biotechnology for nitrate-containing wastewater treatment. The nitrogen removal performance of anaerobic denitrifying upflow anaerobic sludge bedbioreactor (AD-UASB) and granular sludge characteristics were investigated. The results showed the maximum nitrogen removal loading rate (NRR) was reached up to 28.6 kg/(m3·d) as nitrogen loading rate (NLR) was 28.8 kg/(m3·d). At the same time, the effluent NO3
−-N concentration and total nitrogen removal efficiency of AD-UASB was 5.09 mg/L and 99.51%, and the effluent NO2
−-N concentration was as low as 10.97mg/L without obvious accumulation. As NLR was elevated to 36 kg/(m3·d), the effluent NO3
−-N and NO2
−-N concentration were sharply increased to 199.62mg/L and 453.13mg/L, respectively, Thus, the denitrifying metabolic pathway was strongly suppressed which further led to the accumulation of NO2
−-N concentration and the collapse of AD-UASB performance. The granular sludge was broken up and washed out from the reactor, and meanwhile, the concentration of MLSS and MLVSS were declined to 55.09g/L and 24.7g/L, respectively. The research can provide a beneficial reference for the anaerobic denitrification biotechnology application in nitrate-containing wastewater treatment.
A study of adsorption of Cu2+ on magnetic β-cyclodextrin pyrolysis products
Authors: Liu Jun-Hong , Liu Ying , Li Jin , Guo Jian-Hua
Published: July 2020

Magnetic β-cyclodextrin pyrolysis products at 500°C were prepared from β-cyclodextrin pyrolysis products as raw materials, and the adsorption performance of magnetic β-cyclodextrin pyrolysis products on Cu2+ was studied by nitrogen nitriding. this study provided a theoretical basis for the preparation of highly effective adsorbents and the prediction of their adsorption performance on Cu2+. The results show that the adsorption behavior of Cu2+ by magnetic β-cyclodextrin pyrolysis products conforms to the pseudo-second-order kinetic equation. The isothermal adsorption curve conforms to the Langmuir equation, and the maximum adsorption capacity is 405.99mg·g−1.
Research on the adsorption of Cr3+ and Cr6+ by the cracked products of β-cyclodextrin
Authors: Li Jin , Liu Junhong , Liu Ying , Guo Jianhua
Published: July 2020

β-cyclodextrin (β-CD) was used as raw material at different temperatures (300°C, 500°C and 700°C) the adsorption properties of β-cyclodextrin on Cr3+ and Cr6+ were researched by kinetic adsorption and isothermal adsorption. The maximum adsorption capacity and adsorption rate of β-cyclodextrin on Cr3+ and Cr6+ were compared, which provided a theoretical basis for the preparation of efficient adsorbents and the prediction of their adsorption properties on Cr3+ and Cr6+. The results show that the adsorption rate of Cr3+ and Cr6+ by β-cyclodextrin cracking products is in accordance with the Quasi First-order Kinetic model. The adsorption rate of Cr3+ by β-CD300 and β-CD500 is the same and higher than that by β-CD700. The adsorption rate of Cr6+ by β-CD300 is faster. The isotherm adsorption curves of Cr3+ and Cr6+ on β-cyclodextrin cracking products are in accordance with the Langmuir equation. The maximum adsorption capacity of Cr3+ is higher than that of Cr6+, and the maximum adsorption capacity of β-CD500 for Cr3+ and Cr6+ is 1151. 77m/g and 440. 78mg/g.
Effect Analysis of Leakage in the Middle Position and Improvement of an O-type 3-position-4-way Directional Valve with the Spool Structure
Authors: Mao Xuyao , Wu Chao , Ding Hongyuan , Li Bin , Liu Yiou
Published: July 2020

Although the middle position of the O-type 3-position-4-way directional valve with the spool structure is not the working position of the valve, the performance of the middle position is also one of the considerations in the system design. The leakage characteristics of the middle position affect the correctness of the final action of the external load. Leakage effects of the middle position on the action of load under 3 common working conditions were analysed. The results showed that the position of the load actuator moved towards the load direction because of the leakage. The larger the leakage, the faster the response, and the faster the moving speed; the different gaps between different valve ports aggravated the previous phenomenon. The use of a pair of pilot-operated check valves in series and a parallel bypass valve at the inlet and outlet of the actuator could effectively improve the actual cut-off effect of the directional valve.
Research on Fault Diagnosis Method of High Voltage Circuit Breaker Based on gray Relational Analysis and D-S Evidence Theory
Authors: Su Yi , Lu Yufeng , Xie Zhibiao , Wang Jialin , Luo Chuansheng
Published: July 2020

In this paper, a high-voltage circuit breaker diagnosis method based on gray correlation analysis and DS evidence theory is proposed for the fault diagnosis of high-voltage circuit breakers. The fault diagnosis calculation results of a high voltage circuit breaks using this method are compared with those using only gray correlation analysis. The comparison result shows that the proposed method has higher accuracy and reliability, and can accurately determine the type of faults occurring in the high-voltage circuit breaker through the monitored characteristic parameters, avoiding more subjective judgments and improving the reliability of the results.
Communication Distance Test of Pulse MWD System for Mining Mud
Authors: Gao Jun , Li Shan , Xu Qian
Published: July 2020

Aiming at the problem of limited communication distance when the current wireline measurement system is applied in directional drilling to realize the advanced detection and control of mine disaster factors, a mine mud pulse measurement-while-drilling (MWD) system has been developed. However, there is no means to verify and detect the communication distance of this new system in production, acceptance and testing. Based on the communication principle of mud pulse MWD system, this paper establishes a communication data model, analyzes the factors affecting the communication distance of this system, and finally, through building a test platform, tests the communication effect of the mine mud pulse MWD system by simulating the communication distance of 3000 meters. The results show that the pulse MWD system can achieve communication while drilling of 3000 meters or longer.
Optimization of the Formulation and Processing Technology of Quinoa Bread by Response Surface Methodology
Authors: Wei Wei , Wang Lihui
Published: July 2020

In order to ensure rich nutrition and diversified taste of bread, quinoa flour is added to provide consumers with a functional healthier bread. Through the single factor and response surface experiments, the production process of the bread was optimized. The optimal formula of quinoa bread was obtained as follows: Quinoa Powder 1%, Yeast Powder 1.00%, and Butter 5.48%. Under the formula, the sensory score of quinoa bread was 95.9.
Study on Model of Fans with Uneven Blade Spacing
Authors: Zhai Shufeng , Xiao Wanyue Hu
Published: July 2020

We established the CFD simulation model of unequal and equidistant blades in the paper, the pneumatic performance of fan was tested and the aerodynamic performance and aerodynamic noise of the model are analyzed. The differences between the simulation data and the experimental data are small, indicating that this simulation model is consistent with the actual situation.
Performance and Application of Virtual Reality Technology (VR) in Digital Protection of Buildings
Authors: Huang Jianfeng , Gao Hua
Published: July 2020

With the rapid development and continuous improvement of computer technology, more and more computer technology has become an indispensable element in social life, especially the emergence of virtual reality technology (VR), which has a very comprehensive digital performance and is involved in all major industries. VR has a very broad prospect. It can be used to perform digital performance through 3d model mode or 2d panoramic picture mode, and it can also be used in many industries through the characteristics of virtual reality technology itself. This paper mainly narrates the architecture and environment of ancient buildings and ancient villages, as well as the digital performance and application of virtual reality technology, to show the trend and number of the arrival of digital era of virtual reality technology in the near future.
Simulation and analysis of seismic response of parallel double-hole tunnel
Authors: Liu Tong , Liu Yan
Published: July 2020

In order to realize the seismic response analysis of the parallel double-hole tunnel, this paper takes the double-hole tunnel of an underground section of shenyang subway as the research object, USES midas-gts to establish a three-dimensional finite element numerical calculation model, and analyzes and discusses its seismic response. The results show that:Under the action of seismic wave, the maximum position of relative displacement of soil is usually at the soil boundary, and the maximum position of relative displacement of tunnel lining is usually at the tunnel entrance. Along the input direction of seismic wave, the maximum relative displacement of the tunnel is greater than the corresponding value of the other two directions.
Development and application of multi servo motor system of environmental monitoring equipment based on DSP control
Authors: Hua Xue-Hui , Ou Wen-Cai
Published: July 2020

This paper provides a solution of synchronous control of 10-way Panasonic A6 servo motor using DSP chip (TMS320F28379D), which can obtain good dynamic performance and motion position control accuracy. The system uses PID control algorithm to realize intelligent control of position and speed of ten servo motors, and uses database to record the dynamic data of speed, time, distance and power of each servo motor. It can be used in the driving device of environmental monitoring equipment.
Analysis of Internal Heat Transfer Characteristics of High voltage Switch Cubicle Heating Fault
Authors: Su Yi , Xie Zhibiao , Li Lu , Lu Yufeng , Wang Jialin
Published: July 2020

The high-voltage Switch Cubicle is an important equipment in the power system, which undertakes the connection function. There are many kinds of components and parts in the cabinet, and there are many connection contacts. It is easy to be affected by the surrounding environment, aging and corrosion and other internal and external factors. Some components and parts in bad working conditions or in abnormal conditions, especially the dynamic and static contacts of components and parts are prone to heating failure. If the heating parts cannot be identified, maintained and disposed in time, the failure probability of the switch cabinet will be greatly increased, the destructive force and influence caused by the failure will be amplified, and finally the stability of the whole power system will be affected, reliability. Based on the structure of the switch cabinet and the characteristics of the heating fault, combined with the theory of heat transfer, this paper analyzes the internal heat transfer characteristics of the heating fault of the switch cabinet, and uses the fluent software to establish a mathematical model for simulation verification, so as to provide a theoretical basis for the diagnosis of the internal heating fault of the cabinet.
Study on Closing Spring Fatigue Characteristics of High Voltage Circuit Breaker
Authors: Su Yi , Lu Yufeng , Xie Zhibiao , Wang Jialin , Luo Chuansheng
Published: July 2020

One of the most causing closing fault of high voltage circuit breaker is closing spring failure. In order to avoid such closing fault, this paper analyzed the relationship between energy of closing spring and its load, as well as the experiment carried out to get the minimum energy when closing. The time-varying static stress relaxation curve of closing spring force was obtained by analogy the real working condition of high voltage circuit breaker which closing spring is compressed for a long time, the operation time-varying dynamic stress relaxation curve of closing spring force was also obtained by carrying mechanical endurance test. In the end, established the model of closing spring storage life and fatigue life, closing spring life prediction and fault early warning of high voltage circuit breaker was then realized.