bluuebunny/crossref_metadata_2025 huggingface dataset:
Estimating Economic Benefits from Urban Green Space in Shaanxi Province with a Simultaneous Equations Model (SEM)
Authors: Duan Zhaowen , Jiang Rui , Zhang Tingwei
Published: July 2020

In this paper, the economic benefits from urban green space in Shaanxi Province are estimated with a simultaneous equations model (SEM) in this paper. The conclusion is drawn as follows :(1) With the increase of investment, the urban green space of Shaanxi province has been continuously expanding. However, the new urban green space has not generated any social and economic benefits yet, and each square kilometer of it requires an investment of 80 million yuan of GDP. (2) Investment plays an important role in generating new urban green space. The coefficient of investment (a2=4.89, p<0.05) indicates that a private real estate investment of 1 billion yuan can generate 4.890 square kilometers of urban green space. (3) Among five urban spatial models, the expansion of urban transportation space and urban industrial space can promote the growth of GDP and bring new social and economic benefits. In the end, possible reasons on these results are discussed in order to provide a frame of reference to promote the development of urban green space planning in Shaanxi province.
Experimental study on detection of void in concrete pavement slab by FWD
Authors: Wu Yintan , Liu Tao , Zhi Huang , Chen Binbin , Zheng Zhigang , Fang Hongyuan , Yang Kangjian
Published: July 2020

In grouting process, first of all, detection technology should be used to detect the engineering disease area, so as to determine the location of the disease more accurately, which is not only conducive to achieving the desired reinforcement effect, but also can save unnecessary economic expenses. In this paper, the normal pavement slab and the pavement slab with different void states are constructed by self-made test device. Then the deflection values of the normal pavement slab and the pavement slab with different void states are tested by deflectometer FWD. Based on the test, the deflection laws of the normal pavement slab and the pavement slab with different void states are compared and analyzed. The test results show that FWD can accurately identify the condition of pavement void; the deflection of the void position and the area near the void position is obviously larger than that of the normal panel, and the deflection of the void position is proportional to the area of the void area.
Quantitative Analysis of How China’s Six Major Scientific & Technological Program to Include Environment Protection based on Data 1982-2015
Authors: Feng Ying , Xiang Ning
Published: July 2020

Environment protection has been a trans-disciplinary public policy issue on the global government agenda, including China. However, research on how PRC China’s six major S&T program to include environment protection remains a research vacuum. The core research question is how environment protection has been included in China’s major S&T programs in a quantitative way. The conclusion is: a) the impact of environment protection is growing bigger; b) the attention level to environment protection is getting higher and c) the fiscal allocation to environment protection by the 6 S&T programs is getting more. Further, this paper estimates the budget sum and ratio of “Three Major S&T Programs” to environment protection and its five-year ratio from 2001-2013 for the first time.
Research on Fuzhou Logistics Development Status under the Background of National Logistics Hub City Construction
Authors: Li Youlin , Liu Dan , Ke Shengjie
Published: July 2020

In the national logistics hub layout and construction plan, Fuzhou city is listed as the carrier city of the national logistics hub layout, which brings new opportunities to promote the comprehensive transportation development of Fuzhou city, improve the national logistics level, realize the optimization and upgrading of industrial structure and open economy. This paper analyzes the current status of logistics development in Fuzhou, the regression model is used to predict the future freight volume of Fuzhou city, combined with the predicted results, the paper puts forward some countermeasures for the better development of logistics industry in Fuzhou.
Evolutionary Game Study on Technical Cooperation Innovation of Photovoltaic Enterprises with Multi-agent Participation
Authors: Hu Jun , Wu Junmin , Wu Jie , Sheng Yongxiang , Shi Qinfen
Published: July 2020

The paper establishes a tripartite cooperative technology innovation game among photovoltaic enterprises, universities and governments, and analyzes the influence of government subsidies, distribution coefficient and other factors on the cooperative technology innovation game; this paper links the innovation cost with government subsidies and preferential policies, and puts forward the factors of innovation investment and policy support into the game model, which is based on the key influencing factors Based on the game payment matrix of three-party cooperation innovation of prime, the equilibrium solution of industry university research cooperation innovation is obtained by evolutionary game method, and the influence of innovation input, policy support, government subsidy and other factors on cooperation technology innovation is explored by numerical and case analysis. The results show that the appropriate subsidies of the government can effectively promote the technological innovation of cooperation between photovoltaic enterprises and universities; enterprises can improve the willingness of cooperation and innovation by properly increasing their investment in innovation; photovoltaic enterprises and universities are sensitive to the allocation ratio of cooperative income and penalties.
Research on the effects of salinity on the microbial community of novel constructed wetland
Authors: Song Weixing , Ji Junyuan
Published: July 2020

In this paper, a novel patent intermittent aeration vertical flow constructed wetland (IA-VFCW) was developed, and the influences of salinity on the microbial community of IA-VFCW were investigated. The experimental results showed that bacterial communities at the genus level were transited along with the salinity varied from 0‰ to 20‰. Ferritrophicum and Psychrobacter show an increasing tendency and the maximum abundance was 14.8% and 9.8%, respectively. As salt concentration was increased, Cyanobacteria was gradually disappeared. A total of 8 samples were carried out by microbiology, ten different genera were associated with the removal of nitrogen which included as follows: Halomonas, Thiobacillus, Cyanobacteria, Denitratisoma, Arcobacter, Acinetobacter, Sulfurimonas, Nitrosomonas, Dechloromonas and Hydrogenophaga.
Water resources allocation in Erhai irrigated district considering catchment water-cycle health
Authors: Su Jianguang , Wang Fei , Gao Rong , Mi Zhou , Chen Jinming , Gu Shixiang
Published: July 2020

In order to realize the healthy circulation of Erhai Basin water system, this paper constructs the Mike basin simulation model of Erhai Basin water resource system through the concept of water resource comprehensive allocation. Which is based on the principle of Erhai Lake water ecological environment protection and follows the principle of ecological priority, sanitary water into the lake, double control of total amount and consumption, and water conservation and emission reduction. The results show that agriculture irrigated area of Erhai Basin should be gradually reduced to 472000 mu, and 48200 mu of wetland ecological pool should be increased, which is used as the collection area of basin landscape and irrigation return water. After adjusting the crop planting pattern according to the depth of water saving in Erhai irrigation area, the goal of controlling the agricultural water consumption to be no more than 201 million cubic metre and the total water consumption to be less than 366 million cubic metre should be achieved. The effect of reclaimed water irrigation on water saving and emission reduction is considerable. The application of reclaimed water irrigation can reduce the amount of clean water used in paddy growth period by 46.4%, and the amount of nitrogen fertilizer applied by 30.2%. The replacement rate of garlic reclaimed water can reach 100%. After the comprehensive allocation of water resources, it can supply 501 million cubic metre of ecological water in the river channels and 359 million cubic metre of water out of the river channels. Through the comprehensive utilization project of farmland drainage water and the construction of ecological regulation and storage belt, all irrigation drainage water should be reused and zero discharge can be realized. TN and TP emissions in irrigated area will be reduced by 39.3% and 46.3% respectively. Compared with the current situation, Erhai Lake water inflow and cleanly water inflow increased by 65 million cubic metre and 134 million cubic metre respectively. The annual average water level of the lake will be 0.15m higher than the current situation.
Analysis and Discussion on the Application of Landscape Plant Configuration in Landscape Design
Authors: Wu Xiaonan
Published: July 2020

This article analyzes the application principles of landscape plant configuration, including the principle of natural priority, the principle of adapting to local conditions, the principle of color suitability, and the principle of seasonal suitability. This article combines the application of landscape plant configuration in garden design, such as the division of spatial areas, independent landscape modeling, the use of plant culture, and the reasonable combination of colors. By studying the use of diverse plant species, we can consider the interaction between plants and native plants precautions, such as the use of foliage plants and flower plants. The purpose of this article is to improve the rationality of landscape plant configuration and the comprehensive application level of garden design.
Global Rainstorm Temporal Variation from 1979 to 2016 Based on the Perspective of Land-Ocean Differentiation
Authors: Kong Feng
Published: July 2020

Based on the ERA-Interim precipitation data from 1979 to 2016, this paper uses a variety of statistical methods to diagnose the multi-attribute time series characteristics of global rainstorms and its response to ENSO from the perspective of land-ocean differentiation. The results showed as follows. (1) The global, global land and global ocean rainstorm and their contribution rates showed an increasing trend from 1979 to 2016. The global, global land and global ocean total rainfall showed an decreasing trend. The global land total rainfall showed a distinct sectional change pattern, which first increased from 1979 to 2006 and then decreased from 2007 to 2016. The comparison between the rainstorm and the total rainfall in global land and ocean showed that the rainstorm tended to increase in both ocean and land regions from 1979 to 2016, while the weak intensity rainfall tends to decrease in the globe. (2) The results of MK mutation test showed that the global, global land and global ocean rainstorm changed abruptly in the year of 2006, 1999 and 2008, respectively, without passing the 0.05 significance level test. The global, global land and global ocean total rainfall changed abruptly in the year of 1998, 2014 and 1994, respectively, and passed the test of 0.05 significance level. The rainstorm contribution rates of global, global land and global ocean changed abruptly in the year of 2006, 2003 and 2007, respectively. Only global land rainstorm and global ocean rainstorm passed the 0.05 significance level test. The year of abruptly change of global rainstorm and total rainfall were consistent with the year of ENSO warm event or the year of transition from cold event to warm event. (3) The global land and ocean rainstorm and total rainfall did not change consistently on multiple time scales from 1979 to 2016, but showed inverse phase or forward and lag phase correlation. Fourthly, compared with ENSO, global land (ocean) rainstorm changed earlier (lag) in high energy spectral region. Compared with ENSO changes in low energy spectral region, global land rainstorm changes were consistent or ahead of time, while global ocean rainstorm changes were mainly ahead of time compared with ENSO changes.
Study on Soil Hydrological Characteristics of Highway Spoil Disposal Site in Loess Region
Authors: Wang Jian
Published: July 2020

Due to complex climates, geological conditions and landform types, the ecological environment in the western region of China is very fragile. Thanks to the continuous large-scale construction of highway transportation infrastructure over the years, the social transport services are satisfactorily offered in the western region, but also some negative impacts on the ecological environment in the western region are accompanied, especially a large impact on the land resources in extreme scarce in the western and weak soil & water conservation in loess region. The western loess region faces low land bearing capacity, fragile ecological environment and severe soil & water erosion. Restricted by its own conditions of the spoil disposal site, in the case of lack of rainfall and loose soil, it is very important for later restoration to accurately learn the hydrological characteristics of the spoil disposal site.
Analysis on Variation Characteristics of Annual Precipitation Series in Shandong Province
Authors: Niu Jinqiu , Wang Jun , Cao Shengle , Chen Yi
Published: July 2020

Based on the data of precipitation series of 4 stations with long-term observations in Shandong Province, this paper analyzed the change characteristics of annual precipitation series, including interannual change trend, jump, period and representativeness of the series, by means of sliding average, Mann-Kendall rank correlation test, ordered clustering analysis, Fourier analysis, wavelet analysis, residual mass curve and cumulative average modulus coefficient hydrograph, etc. The results indicated that the annual precipitation series of the 4 stations have slight rising trends. The annual precipitation of Yantai Station mutated obviously in 1950.The annual precipitation series of Linqing, Huangtai Bridge and Qingdao Station have periods of 3, 10, 56 and 80 years.
Ecological Environment Evaluation of Vegetation in Zaozhuang City Based on Landsat-8
Authors: Wen Bo , Zhang Jinhao
Published: July 2020

Based on the remote sensing image of Landsat-8, the ecological factors of vegetation were extracted from remote sensing information, and the ecological environment of vegetation was evaluated and analyzed. The evaluation results show that the vegetation ecological environment in Zaozhuang is relatively good in general, and the evaluation index is in the majority in the range of 4-10, indicating that most of the vegetation ecological environment in Zaozhuang is in excellent state and mostly concentrated in plain and forest areas. Among them, the areas with excellent grades account for 44.07% of the total area, the areas with good grades account for 24.91%, the middle grades for 13.04%, and the poor grades for 17.98%; the western and southern regions are relatively good, the vegetation is basically undamaged, and the ecological structure is reasonable, in line with the concept of sustainable development.
Transformation of slope runoff base on inflow condition and slope
Authors: Li Li , Li Binbin , Lin Jing , Zhang Jinhu , Zhang Lixin , Duan HL , Bi WY , Li WW , Liu CX , Shen ZZ
Published: July 2020

The development trend of the Yellow River basin is forecasted, and the direction of strengthening the research is put forward, which can provide a useful reference for the research on the ecological protection and erosion law and the high-quality development of the Yellow River basin. The change law of runoff on the slope is very obvious and increases with the increase of discharge flow. In the early stage of the experiment, the runoff on the downslope of each drainage flow was small. With the continuation of the experiment, the soil on the slope was gradually saturated, and the infiltration capacity was gradually weakened, and the balance between incoming water and infiltration was finally reached. Therefore, the runoff on the slope gradually reached a stable state of fluctuation under the condition of a certain amount of incoming water.
Effects of arbuscular mycorrhizal fungi on the repair capacity of perennial ryegrass (Lolium perenne L.) in the uranium-containing soils
Authors: Rong Lishan , Xia Lin , Yuan Bin , Lai Xiaobo , Hu Juntong , Liu Yingjiu
Published: July 2020

This research inclines to study the ramification on arbuscular mycorrhizal fungi (AMF), including Glomusclaroideum (G. claroideum) and G. mosseae strains as well as the repair process of perennial ryegrass (Lolium perenne L.) in the uranium-containing soils. Three times at 120°C for an hour was required to disinfect the soil mixture. Spraying the uranium (U3O8) into the soil mixture and mixing until the ingredients were thoroughly blended, serving the purpose of obtaining the uranium-containing soil mixture with 5 mg/kg U3O8. A week later, AMF was inoculated into every flowerpot and chamber facility. Seeds of perennial ryegrass were cultivated with thirty seeds in each flowerpot or each indoor equipment in a fortnight’s time. Perennial ryegrass plants tended to be harvested after sowing and meeting the conditions of 60 days. Three substances are detected by three different detection means(Photosynthetic pigments, soluble proteins, and malondialdehyde correspond to ethanol extraction method, Coomassie brilliant blue method, and thiobarbituric acid method, respectively). Additionally, testing included activities of alkaline phosphatase and succinate dehydrogenase as well. Moreover, Hitachi H-7650 transmission electron microscope performed the function of observing cellular and subcellular distributions of uranium in plant epidermal cells. Photosynthetic pigment standards of perennial ryegrass are subject to AMF, which not only has a tendency to enhance the soluble protein levels in perennial ryegrass, but also gains the possibility of holding up the uranium-induced improvement of malondialdehyde levels in perennial ryegrass. G. mosseaes is properly more efficacious than G. claroideum in the attenuation of uranium damages in cell structures of perennial ryegrass. Our results demonstrate that AMF is capable of developing the capacity of perennial ryegrass on repairing the uranium-related soil contamination.
Study on Nutrient Content Loss of Processing Manual Vegetable Noodles by Different Cooking Methods
Authors: Wu Xiaowei , Shan Wenwen , Li Jingjun
Published: July 2020

The scientific and reasonable heat treatment methods can be determined after processing through different heat treatment on manual vegetable noodles, using some apparatus like the Kjeldahl nitrogen, Soxhlet extraction and spectrophotometry methods to analysize protein, fat, vitamins and observe their nutritional composition changes. The results showed that: after different heat treatments on manual vegetable noodles, all kinds of nutrient content have some changes of certain differences. Among the changes, vitamin B2 and vitamin C contents produce more apparent changes, and vitamin C loss is more severe. With the prolongation of heating time, vitamin C loss increases; fat content has little growth; adding proper amount of white vinegar into the heating medium, the loss of vitamin B2 and vitamin C reduces; after adding proper amount of dietary alkali, the loss of vitamin B2 increase obviously.
Study on the pyrolysis characteristics of walnut processing by-products
Authors: Xu Shanfeng , Ou Chuan , Chen Yuzhu , Xiao Hui , Fu Chengang , Lu Wenyi , Wu Zhuoling
Published: July 2020

Thermogravimetric analysis (TG) was used to study the thermal degradation behaviour of walnut shell and walnut meal during thermal treatment, and the Kissinger and Flynn-Wall-Ozawa equation were used to calculate the activation energy. The heating rate was 5, 10, 15, 20, 25 °C/min with nitrogen atmosphere. The results showed that the thermal degradation process of walnut shell and walnut meal can be divided into three stages: dehydration stage, rapid pyrolysis and carbonization stage. The greater the heating rate was, the faster the thermal degradation became. At the same heating rate, the weight loss rate, the peak conversion rate and the carbon residue in the rapid pyrolysis stage of walnut shell were all greater than those of walnut meal. The activation energy of thermal degradation of walnut shell was 194.54 kJ/mol and 194.50 kJ/mol. The activation energy of thermal degradation of walnut meal was 167.37 kJ/mol and 169.78 kJ/mol. Walnut shell had higher thermal degradation activation energy and thermal stability.
Preparation and Properties of Superhydrophobic Surface of Conducting Polymer Based on Linking Reaction
Authors: Li Hui
Published: July 2020

Superhydrophobic Surfaces Have Great Application Value in the Fields of Self-Cleaning, Corrosion Resistance, Fluid Drag Reduction, Ice Resistance and the Like, While Superhydrophobic Surfaces with Transparency, Conductivity or Other Functions Have Larger Application Space. the Appearance of the Lotus Leaf Has a Self-Cleaning Function, and the Most Typical Example is the Lotus Leaf Surface Which is out of Silt But Not Imbrued. through the Research and Analysis of Superhydrophobic Phenomena in Nature, the Low Surface Energy Substances on Superhydrophobic Surfaces and the Micro-Nano Scale Hierarchical Structure Are Considered as the Two Decisive Factors for Forming Superhydrophobic. the Classical Theory of Surface Wettability Indicates That the Wettability of Liquid Depends on the Surface Energy and Surface Roughness. Various Methods Have Been Developed for the Preparation of Superhydrophobic Surfaces with Conducting Polymers. by Selecting Materials with Appropriate Surface Energy and Fine Control of Surface Structure, Various Surface Functionalization Can Be Realized.
Overview of Oil-water Separation Equipment Technology of Refined Oil
Authors: Liao Xiao-Hua , Yang Shen-Jun , Qin Ming-Wei , Dou Ming-Yuan , Feng Qing , Li Hao-Ming , Zou Shuai
Published: July 2020

With the continuous development of social industry and economy, environmental problems are increasingly prominent. The disposal of oily wastewater needs to be addressed. As a physical separation method, gravity separation of oil and water has the advantages of low price, economic benefit, convenient maintenance and recyclable oil. This paper introduces the principle of gravity oil and water separation technology, expounds the research progress of gravity oil and water separation technology and equipment, and finally, puts forward the problems existing in the future development and puts forward some suggestions.
Preparation of magnetic ferrocarbon matrix composites and study on their microwave dielectric properties
Authors: Bao Wenli , Chen Wen , Si Zhenjun
Published: July 2020

Among many electromagnetic absorbing materials, carbon matrix composites are regarded as an ideal electromagnetic absorbing agent because of their advantages of low density, low cost and strong electromagnetic loss. It is generally believed that the properties of the electromagnetic absorbent are closely related to its composition and microstructure, but the understanding of the relevant mechanism needs to be further improved. Therefore, this paper studies a new ternary composite material HCNTs/Fe@Fe3O4, which is made of acidified carbon nanotubes (HCNTs) modified by magnetic core shell Fe@Fe3O4 nanoparticles. The material has a variety of interface polarization and dipole loss forms, showing a good electromagnetic absorption capacity and impedance matching performance. The absorption band width of the electromagnetic absorber can reach 5.5 GHz at the thickness of 1.5 mm. The C

o
values of HCNTs/Fe-@Fe3O4 and HCNTs/Fe-@Fe2O3 samples with strong antioxidant capacity fluctuated with the change of frequency, indicating that the eddy current loss had a weak magnetic loss on the samples. Thus, it can be inferred that the changed C

o
value also indirectly proves that the magnetic loss of the sample may come from natural resonance.
A Novel Design of Conjugated Polymer/TiO2 towards Photocatalytic Activity under Visible Light
Authors: Liu Linlin , Duan Qian
Published: July 2020

In this work, we successfully designed and functioned a novel thiophene-based conjugated polymer to match with TiO2, forming a range of PDPPT-T-COOH/TiO2 heterostructure. The as-prepared PDPPT-T-COOH/TiO2 heterostructure showed the remarkable photocatalytic degradation performance of TC. Under visible light, the highest k value of PDPPT-T-COOH/TiO2-3% heterostructure was 0.00652 min−1, which was 5.48 and 11.6 times that of a single PDPPT-T-COOH and TiO2. The enhanced photocatalytic ability could be owed to the interfacial interaction and excellent migration efficiency of charge carriers between the heterojunction photocatalyst. This work may offer innovative feasibility to synthesize PDPPT-T-COOH/TiO2 heterostructure with high stability and superior photocatalytic activity.
Simultaneous removal of SO2 and NO from flue gas using CeO2 promoted CuO/γ-Al2O3 catalysts
Authors: Zhang Qi-Long , Dong Yong , Cui Lin
Published: July 2020

The simultaneous desulfurization and denitration performance of the Cu8Ce3 and Cu8Ce3S catalysts were studied in a fixed-bed reactor. The test results show that the presence of SO2 has a poisoning effect on the denitration performance of Cu8Ce3 when the flue gas temperature is below 350°C, but this kind of toxic effect is reversible. The root cause is that the sulfate species such as CuSO4 and Ce2(SO4)2 formed on the surface of Cu8Ce3S have a lower denitration activity below 350°C than CuO and CeO2. However, Changes in catalyst pore structure after desulfurization could not affect the amount of NH3 adsorbed significantly. The formation of SO4
2- on the Cu8Ce3S catalyst surface increased the number of Lewis acid sites on the catalyst surface, which improved the catalyst’s strength ability to react with NH3 to ensure that Cu8Ce3S has a faster reaction rate than that of Cu8Ce3 above 350°C. The catalytic selectivity of Cu8Ce3S for NH3 is better than that of Cu8Ce3 at 350-500°C, which is the fundamental reason for the improvement of denitration efficiency at high temperatures.
Preliminary estimation of chemical compositions and emissions of particulate matters from domestic cooking in Beijing
Authors: Qi Xuekui , Qu Jingming , Liu Jianhui , Wang Xinxin , Guo Pengran , Zhang Yinglei , Jia Kai , Zhang Yuxiang , Liu Yanju
Published: July 2020

Family cooking oil fume are becoming an important source of urban atmospheric fine particulate (PM2.5). In order to understand the characteristics and level of PM2.5 emission from family cooking fume. Mass concentration, chemical compositions and emission factors of PM2.5 emitted from family cooking fumes were studied based on in situ measurement, and the total amounts of PM2.5 emission from family cooking fumes in Beijing was preliminary estimated. Results showed that mass concentration of PM2.5 emitted from family cooking fumes ranged from 329.88±91.24 to 500.89±130.44 μg·m−3, the average mass concentration was 398.82±102.55 μg·m−3. Among all the measured chemical components of organic carbon (OC), water-soluble ions and element carbon (EC) account for about 51.34%-65.45%, 6.93%-14.78% and 0.73%-1.82%, respectively, other untested components account for about 19.44%-38.05%. According to the field investigation and actual measurement, the average PM2.5 emission factor was 210.57±54.15 mg·f·d−1 based on household number. Combined with the 2018 statistics annual report of Beijing, the total amounts of PM2.5 emission from family cooking oil fumes in Beijing was estimated to be 553.38±142.31 t·a−1 in 2018. The emission amounts has certain uncertainty, the following work should be carried out to measure the PM2.5 emission from family cooking oil fumes in different administrative regions.
Simultaneous removal of SO2 and NOx from biomass flue gas by ozone oxidation + wet scrubbing method
Authors: Xu Zhenghui , Xiao Xiang , Fang Ping , Huang Jianhang , Wu Haiwen , Chen Dongyao
Published: July 2020

In this work, factors affecting NO and SO2 removal were systematically investigated, including O3/NO ratio (V/V), different oxidant types, NaOH and KMnO4 concentrations. Results indicate that the degree of oxidation cannot be pursued too much and the best O3 / NO ratio (V/V) is 0.5. The increased amount of KMnO4 and NaOH promoted the removal efficiency of NOx. The key to the removal of NOx by KMnO4 was mainly that when the KMnO4 was 0.013 mol / L, the removal efficiency of SO2 and NOx reached 100% and 93.75%, respectively. This indicates that the technology can not only efficiently remove NO and SO2, but also has a great application prospect.
Design, Synthesis and Photophysical Properties of Chlorinated Small Molecule Non-fullerene Acceptor Based on Benzotriazole for Organic Solar Cells
Authors: Yang Can , Han Zi-Yang , Zhang Shao-Wen , Wang Jin-Liang
Published: July 2020

A novel narrow band-gap chlorinated non-fullerene pentacyclic small molecule acceptor based on benzotriazole with extended absorption edge to the near-infrared (NIR) region, named BZIC-4Cl, was designed and synthesized. Through introducing multi-fused benzotriazole and IC-2Cl, BZIC-4Cl could maintain a lower optical bandgap of 1.38 eV with broad and efficient absorption band from 500 to 950 nm due to increased π−π interactions by the covalently locking thiophene and benzotriazole units. There is a stronger intermolecular charge transfer (ICT) effects between the BZTP core and IC-2Cl end-group. The purity and chemical structure of the acceptor, namely BZIC-4Cl, were tested by 1H NMR. Even though BZIC-4Cl showed slightly poor solubility in certain organic solvents, BZIC-4Cl showed broad and strong absorption with a narrow band-gap which can be matched with polymer donor for efficient organic solar cells.
Adsorption properties of β-cyclodextrin cracking products for Cd2+
Authors: Ying Liu , Liu Junhong , Li Jin , Guo Jianhua
Published: July 2020

B-cyclodextrin can react with metals through hydroxyl groups, which has a certain contribution to the removal of heavy metals. However, the application of β-cyclodextrin in heavy metal adsorption is limited because of its slow adsorption speed and low adsorption capacity. In this paper, β-cyclodextrin was pyrolyzed under oxygen limitation to prepare β-cyclodextrin pyrolysis product, and its adsorption performance of Cd2+ in water was studied. The adsorption of Cd2+ by the β-cyclodextrin cracked product conforms to the quasi-first-order kinetic model, and the Langmuir fitting effect is better. The maximum adsorption capacity of Cd2+ by β-cyclodextrin cracking products prepared at 300 °C, 500 °C and 700 °C is 1029.04mg/g, 1237.42mg/g and 829.06mg/g, respectively.
Layer-by-layer self-assembled multilayer films of sulfonated-β-cyclodextrin and its reversible adsorption of methyl orange
Authors: Qian Yan , Pei Fangyu , Kong Xiangmei , Zhi Junge
Published: July 2020

Multilayer film based on photosensitive p-diphenyl diazonium salt (biPh-N2+) and sulfonated-β-cyclodextrin (S-β-CD) were fabricated by layer-by-layer self-assembly. The ionic bonds formed between diazonium salt and sulfonic acid ion in the multilayer film converted to covalent bonds and formed stable ultra-thin film when the diazonium groups decomposed under UV light irradiation. Meanwhile, the concentration of S-β-CD aqueous solution can influence the self-assembled multilayer films, while the pH value (pH=3~9) had little effect on the self-assembled process except the strong alkaline solution (pH=11). Moreover, based on the electrostatic interactions of S-β-CD and MO to form a host-guest complexation, the multilayer film of (biPh-N2+/S-β-CD)12 can absorb methyl orange (MO), and which can release reversibly in ethanol.
Study on synergistic effect of removal of nitrogen and phosphorus by mixed modified zeolite
Authors: Zhou Bingling , Zhang Chunyu , Li Zaiguo , Li Cuihua
Published: July 2020

Sodium chloride-modified zeolite Z-Na for the removal of ammonia nitrogen and lanthanum-modified zeolite Z-La for the removal of phosphorus were prepared by sodium chloride modification and lanthanum chloride modification. Through adsorption kinetics and isotherm model fitting, the synergistic effect of pollutants in the removal of ammonia nitrogen and phosphorus by these two zeolites was explored. The results show that in the case of composite pollutants, the presence of phosphorus can inhibit the adsorption of ammonia nitrogen by Z-Na, (the adsorption rate is reduced from 2.3840ℎ−1 to 1.3442ℎ−1, and the maximum adsorption capacity is 13.6612mg / g reduced to 11.8906mg / g);the presence of ammonia nitrogen will promote the adsorption of phosphorus by Z-La (adsorption rate increased from 1.0623ℎ−1 to 4.8595ℎ−1, while the maximum adsorption capacity is almost unchanged).
Using Hilbert-Huang Transform to Process and Analyze the Corrosion Acoustic Emission Signal of the Tank Bottom Plate
Authors: Jiang Wenxin , Gao Ke , He Zhi , Pan Meng , Zhang Shijie
Published: July 2020

In this article, Hilbert-Huang transform (HHT) is applied to the tank bottom corrosion acoustic emission signal de-noising processing and decomposition, the effective signals are explored and extracted, and a new method of noise reduction for acoustic emission signal is proposed. The acoustic emission signal of corrosion of tank bottom plate is processed and decomposed by Hilbert-Huang transform, and the energy ratio of each sub-signal in the original signal is calculated, the source data of each sub-signal is extracted, and the effective acoustic emission signal in the original signal is extracted. Using the calculation formula of acoustic emission amplitude, the amplitude of each sub-signal is calculated respectively. The results show that the amplitude of each sub-signal is smaller than that of the original signal. This method can be used to reduce noise and extract effective acoustic emission signals. And it provides the foundation support, to form the method of noise reduction processing and effective signal extraction for corrosion acoustic emission signal on the tank bottom plate. It has some application value to improve the accuracy of the evaluation results of the corrosion state of the tank bottom plate.
Research on high power servo turning control
Authors: Chen Hua-Feng
Published: July 2020

The paper studies the turning control of high power servo system, using variable structure control method, for constant acceleration constant deceleration control and according to kinematics theory, two control methods related to time and error are proposed. Through analyzing the characteristics of high power servo system, combine the torque relationship between the braking angle and the turning control, an accelerated guidance control method is proposed.
Experimental Study on Flexural Property of Precast Cavity Concrete Sandwich Wall Panels
Authors: Yang Xintian , Liu Hui , Cheng Weiyang
Published: July 2020

The sandwich wall panel studied in this article is prepared by setting a cavity between the outer cavity wall body and thermal insulation layer, which is connected by FRP rod connectors. Through the out-of-plane flexural test, the crack development rule is recorded, and the load deformation rule is recorded under serviceability limit state and limit state of bearing capacity. The analysis results can provide reference for the design of precast sandwich wall panels with cavities.
Research on multi-core DSP cooperative control system in environmental protection equipment
Authors: Chen Dali , Hua Xuehui
Published: July 2020

Traditional multi-servo motor control systems have the problems of poor output stability in environmental protection equipment, weak robustness, and low control ability. Based on this, the research of multi-servo motors control systems based on FPGA are proposed. The paper Construct a parameter distribution models on multi-servo motor control, using motor terminal voltage, current, and back-EMF as control constraints, calculate the difference between the output currents of the multi-servo motors, and construct a saturation function to analyze the multi-servo motor control objective function. Sampling phase current signal and PWM duty cycle as modulation parameters, combined with fuzzy adaptive PID control method to control the output robustness of multiple servo motors, calculating the equivalent mechanical power and equivalent electromagnetic power of multiple servo motors. The optimized parameter adjustment method performs self-tuning processing of the motor output, and the transient stability adjustment of the multi-servo motor is performed based on the method of the average terminal voltage analysis to realize the optimal design of the multi-servo motor control law. The test results show that the output stability of the output of the multi-servo motor control system using this method is better, the motor control is more robust and the control ability is higher.
Study on Mechanical Properties of Recycled Concrete Block Mixed with Coal Gangue and Plant Fiber
Authors: Hu Quanquan , Fang Guangxiu
Published: July 2020

In this paper, the recycled aggregates of waste coal gangue and waste concrete crushed by a crusher are used as coarse aggregates, mixed with plant fibers. By changing the mixing rate of plant fibers and coal gangue, the mix design of plant fiber recycled concrete and experiment. According to the compressive strength values of 7d, 14d and 28d concrete, the optimal mix ratio is selected. Correct the calculated value of the compressive strength bearing capacity according to the specific strength value of the plant fiber concrete and ordinary concrete obtained by the test, and obtain the correction coefficient k. According to the best mix ratio, the plant fiber recycled concrete hollow block was designed, and its compressive strength was analyzed by ANSYS finite element. In this paper, the recycled aggregates of waste coal gangue and waste concrete crushed by a crusher are used as coarse aggregates, mixed with plant fibers.
Structure design and analysis of a training track for Bobsleigh-and luge
Authors: Zhang Xiaomeng , Ren Qingying , Liu Wenting , Wang Ying , Zhou Yilun , Gao Xing
Published: July 2020

The construction area of bobsleigh and sled training ground is 10000 square meters. Shear wall structure is below the ground, steel frame structure is above the ground, strip foundation is adopted for the foundation, this paper introduces and analyzes some difficult points of the complex structure in the project, and through the research on the mechanical performance of the structure system and the stress analysis of the key points, the mechanical performance of the structure is studied to ensure the safety and reliability of the construction.
Research on the method of measuring effective energy for quayside container crane based on weighted average method
Authors: Feng Shuangchang , Chang Xiaoqing , Xue Jiai
Published: July 2020

With the rapid development of the world economy, more and more quayside container cranes are put into use in ports. The quayside container crane has the characteristics of large quantity, large power consumption and great energy saving potential. In order to save energy of quayside container crane, the key is to accurately measure the effective energy, the supply energy and the energy utilization efficiency. The weight of the loaded goods carried by the quayside container crane varies greatly in actual work. The test load in the traditional method is specified as 60% of the rated lifting weight, which is different from the actual situation of the crane. Based on the load state level, this paper puts forward the new concept of weighted average effective energy and optimizes the calculation formula. The new test method provides a basis for the accurate test of the effective energy and the energy utilization efficiency in the future.
Research on Life Assessment of Ni-MH Battery through Orthogonal Experiment under Multiple Aging Factors
Authors: Chu A.H. , Chen X , Yuan Y.N. , Zhang T , Yohei H , Xu G.C.
Published: July 2020

The power battery is required to have the same service life as the hybrid vehicle. The cylindrical Ni-MH battery 600DC has been used in many HEVs, which was produced by Shona-Corun Energy Co., Ltd (Shona) in Japan. Recently, Shona has been acquired by Hunan Co-power EV Battery co., LTD (CPEV), and an improved and localized 600DE NiMH battery was produced in China. Therefore, it is necessary to study the cycle life of the battery according to the requirements of the real vehicle. The orthogonal experimental scheme based on characteristic conditions including battery temperature, SOC average value, DOD range and average current was designed. According to the periodic assessment during the aging cycle and the physio-chemical analysis after the aging cycle, it is proved that the depth of DOD has a significant impact on the life aging. The main factors of the performance degradation of the battery are the pulverization and corrosion of the negative alloy, the reduction of the active material Ni (OH)2 and the production of the inert material Ni2O3H in the positive electrode.
Experimental Analysis on Flexural Performance of Fair-faced Recycled Concrete Beams
Authors: Fang Xiaojun , Fang Guangxiu , Hu Pengjie , Liang Xiaoxu
Published: July 2020

This paper mainly studies the mechanical properties of fair-faced recycled concrete beams when different recycled aggregates replace natural aggregates and fly ash replaces cement in equal amounts. Through experiments, the crack development law and failure mode of fair-faced recycled concrete beams are first studied. Secondly, the curve equation of load and deflection and the relation curve of load and stress are obtained. Finally, the normal section bearing capacity obtained from the test is compared with the normal section bearing capacity calculated according to the current national code for concrete structure design, and the correction coefficient of the code formula is proposed, which provides reference for the research and engineering application of similar fair-faced recycled concrete beams in the future.
Summary of VOCs Treatment Technology in Product Oil Depot
Authors: Yang Shen-Jun , Liao Xiao-Hua , Dou Ming-Yuan , Feng Qing , Li Hao-Ming , Zou Shuai
Published: July 2020

With the continuous development of social industry and economy, environmental problems are increasingly prominent. The problem of VOCs emission treatment needs to be solved. This paper introduces the source and harm of oil vapor produced in oil depot, and expounds the treatment measures of VOCs. The treatment measures of storage tank are introduced. The principle and research progress of four kinds of recovery processes are described. The development mode and research direction of VOCs treatment in oil depots in the future are prospected, the importance of oil vapor recovery is pointed out, and the recovery technology of VOCs should be developed in the direction of intelligence, integration, miniaturization and energy saving.
Characteristics and design key points of small CIGS solar UAV
Authors: Feng Shaojun , Li Penghai , Xue Yuming , Gao Fan , Bai Zilong , Zhang Liming , Guo Qing
Published: July 2020

Based on the working mode of small CIGS solar UAV, the difference and basic characteristics between its energy power system and traditional UAV are analyzed. Some key problems to be solved in the miniaturization design of flight platform are studied from airfoil selection, aerodynamic layout design and basic parameter calculation. By increasing the power factor of the airfoil and reducing the wing load, the UAV can get a smaller sinking rate. In addition, through the coupling of energy system and power system and the use of new composite materials, the overall efficiency can also be improved and the endurance of solar UAV can be effectively extended. Combined with the intelligent flight control system, it can realize full autonomous over the horizon long-time flight. The main conclusions can provide reference for the miniaturization design and optimization of solar UAV.
Study on Dielectric Material for Generating Ozone by Dielectric Barrier Discharge
Authors: Du Zhehua , Lin Xin
Published: July 2020

Dielectric barrier discharge is mainly used to produce ozone in industry. The dielectric plays an important role in this form of discharge. Because of their good physical and chemical properties, some kinds of ceramic material and enamel material have been studied and applied as the dielectric. Experiments show that as frequency increases, dielectric constant and loss anlge tangent of all ceramic samples decrease. For samples with larger dielectric constant, dielectric constant decreases faster, and the magnitude of the decrease is larger. When the frequency is high, dielectric constant and the loss angle tangent basically stabilize. At the same frequency, the loss angle tangent of ceramic samples with high dielectric constant is also higher. The dielectric constant and loss angle tangent of different ceramic samples differ greatly at low frequency, while the difference is relatively reduced at high frequency. From the perspective of electrical performance, ceramic dielectrics are not much superior to enamel dielectrics. Enamel material is more advantageous than ceramic material.
Experimental Study on the Vibration Characteristics of Oil Tank Model of Oil-Immersed Transformer
Authors: Ma Yuchao , Wan Wei , Mo Juan , Li Xiang
Published: July 2020

The problem of vibration and noise of transformers in urban substations is more and more concerning to society. With a 110kV transformer substation as the research object, the oil tank model of the oil-immersed transformer is designed according to the principle of similitude. Through the modal test of the oil tank model, the vibration characteristics of a 110kV oil-immersed transformer model are obtained, which will help avoid the resonance frequency in the structure design of transformer oil tanks and provide measured data for the vibration and noise control design of transformers. Finally, the finite element model of transformer oil tanks is established, and the vibration characteristics of the oil tank are simulated, and consistent analysis results are obtained.
Design of anti-collision device of mine trackless rubber tire vehicle
Authors: Du Chunhui
Published: July 2020

For the problem of safety accident such as the collision between equipment or between person and equipment beneath the coal mine, after analyzing the advantages and disadvantages of active safety technology now, a high precision ranging system based on UWB has been designed. This system uses Symmetric Double Sided Two-Way Ranging algorithm which can reduce the influence of clock drift, improve the ranging accuracy of the system and reduce the false alarm rate of the system. The device has the functions of personnel intrusion alarm, vehicle approach alarm, automatic shutdown of the vehicle, and so on. The results show that the maximum ranging error of the system within 20 m is ±0.13 m, which can fully meet the requirements of vehicle active safety collision avoidance. Through the research and application of preventing intrusion and proximity alarm devices, the collision accidents between vehicles and personnel as well as those between vehicles and vehicles are effectively avoided. The safety of underground personnel is improved, and the efficiency of underground auxiliary transportation is also improved.
Research and development of frost resistance of concrete filled steel tube
Authors: Dou Lijun , Yang Yanqi
Published: July 2020

This paper mainly introduces the general situation of research on the frost resistance of CFST in China in recent years, expounds the mechanism of the frost damage of CFST and the main factors affecting the frost resistance of CFST, and further discusses the existing problems and defects in the existing research. In order to improve the frost resistance of CFST, some reasonable suggestions are put forward to provide theoretical support for practical projects.