bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of molding parameters on the properties of molding fuel derived form agroforestry biomass waste by pyrolysis
Authors: Sun Yuxin , Xu Jiaying , He Meixuan , Tang Yixuan , Cao Leichang
Published: May 2021

Biochar is now recognized as an excellent fuel with excellent performance in the combustion process and environmental friendness. As the main raw material of biochar, agricultural, and forestry biomass waste has a high waste rate. Therefore, researchers have conducted long-term research on the technology of generating biochar from agricultural and forestry biomass. Based on the current research and analysis of the existing molding fuel technology, the influence of different research parameters on the preparation of different biomass fuel is explored. The influences of molding temperature, molding pressure, raw material moisture content and the ratio of adhesive to toner on the performance of biomass fuel are focused on analysis. Finally, a conclusion is drawn based on the experimental data.
Research on the Increase of Mineral Dissociation Degree by High Pressure Water Jet
Authors: Cai Mingming , Xu Chao , Gao Tengyue , Zhang Juntong , Bo Luzhong , Chen Yanbo , Qin Guanglin , Ji Qiang , Yu Congquan
Published: May 2021

The traditional grinding technology of ball mill has many problems, such as high energy consumption, unable to maintain the original crystal shape, and it is difficult to obtain high quality and high purity ultrafine powder. The high-pressure water jet mineral dissociation technology is a new technology which is developed in response to these requirements. The experiment shows that the water jet technology has a strong ability of ultrafine grinding. With the increase of jet velocity, the crushing effect is more obvious. The high-pressure water jet pulverization is superior to ball milling for the separation of rare earth minerals, which has the characteristics of high dissociation degree and relatively uniform particle size. The water jet pulverization is more beneficial to the separation and recovery of rare earth minerals.
Determination of Total Volatile Organic Compounds in Recycled Plastic by Headspace/Gas Chromatography-Mass Spectrometry
Authors: Xu Shanhao , Luo Chuan , Wang Hao , Zhang Yin , Zhang Chao , Yuan Lifeng
Published: May 2021

A method of headspace combination with gas chromatography-mass spectrometry was developed for the determination of total volatile organic compounds (TVOC) from recycled plastic. The factors such as equilibrium temperature, equilibrium time and sample uniformity were investigated. Toluene was selected as reference material. The results showed that the optimum conditions were as follows: equilibrium temperature was 80°Cand equilibrium time was 25min. The calibration curves showed good linearity and the correlative coefficients was 0.9975. The method detection limit(S/N=3) was 0.01mg/kg, and the recoveries ranged from 83.5% to 108.3%, with RSDs <6%. The method has the advantages of no pretreatment, accurate results and high sensitivity etc., and can be used for the determination of TVOC from recycled plastic.
Synthesis and characterization of ZnSe: Ag/SiO2 nanoparticles
Authors: Huang Fenghua , Huang Tao , Wu Xiangwei , Pang Wenhui
Published: May 2021

Argentum-doped zinc selenide/silicon dioxide nanoparticles (expressed as ZnSe: Ag/SiO2) were synthesized by Stöber method. The structure, morphology and fluorescence properties of the quantum dots were characterized by X-ray powder diffraction, transmission electron microscopy, infrared spectrum, ultraviolet-visible spectrum and fluorescence spectrum. The results show that the as-prepared ZnSe: Ag/SiO2 nanoparticles are spherical, most of which are about 30 nm in size, and have good fluorescence properties. Compared with that of ZnSe: Ag nanoparticles, the stability of ZnSe: Ag/SiO2 nanoparticles is enhanced obviously. The ZnSe: Ag/SiO2 nanoparticles will have potential applications in biological fluorescence analysis.
Evaluation of influencing factors on the adaptability of ICD completion technology
Authors: Zhang Guohui , Li Liangchuan , Chen Rong , Wang Peng , Zhang Guowen , Sun Jiewen
Published: May 2021

After years of research and practice, ICD well completion technology has become a relatively mature completion technology, and has been successfully applied in hundreds of horizontal Wells abroad. However, due to many factors affecting ICD effect, mature evaluation methods have not been completely established. At present, the main index of ICD water control development effect is to balance inflow profile and inhibit water production, and the evaluation factors involve reservoir, process and equipment structure. This paper summarizes the factors influencing the effects of ICD, using orthogonal experiment design method to carry on the comprehensive evaluation, and puts forward the corresponding Suggestions
High and low temperature device with Non-magnetic based on PID control
Authors: Wang Xiaofei
Published: May 2021

There are not a single influencing factors in the temperature drift correction test of tilt measuring products. In order to solve this problem, by analyzing and calculating the influencing factors, a non-magnetic height suitable for temperature drift correction of tilt measuring products is designed. Low temperature device, this device is based on PID control, which has the advantages of precise temperature control, rapid heating, and good temperature stability.
Femtosecond Laser Processing Structural Surfaces of Zinc anodes for rechargeable zinc-air battery
Authors: Wang Chunlian , Yuan Yanping , Chen Jimin , Li Dongfang , Wu Jian , Zhang Kaihu
Published: May 2021

Researches about renewable rechargeable battery have attracted the attention of many scholars, due to increasing demands of energy and global energy crisis. Zinc-air batteries are one of most promising energy sources, but the morphological changes and forming dendritic of zinc anodes greatly limit their cycle life during the charging-discharging process. In order to improve zinc-air batteries electrochemical performance and control dendritic growth, surface of zinc anodes is irradiated by femtosecond laser with different power. The electrochemical results indicate that zinc anodes of zinc-air batteries with different surface structures show different electrochemical properties. Due to the removing oxide layer on the surface of zinc anode, adding contact areas of zinc anodes and electrolytes, and restraining dendritic growth by femtosecond laser processing, first discharge time of zinc anodes with surface structures of zinc-air batteries is about 10 times than that of without processing. It is also found that more intense chemical reactions occur in the area treated by femtosecond laser.
Study on aging properties and degradation mechanism of FRP bars
Authors: Wang Meng , Yang Yaqiang
Published: May 2021

The tensile properties of fiber-reinforced composites (FRP) under various factors of composite aging were studied by tensile test. The test parameters mainly include temperature, salt spray, ultraviolet, rainwater, and stress. The results show that the higher the temperature, the faster the FRP tensile strength decreases; At the same temperature, the ultraviolet radiation has little effect on BFRP bars. Salt spray and rainwater hydrolyze the resin on the surface of the steel bars and expose the inner steel bars. Stress can accelerate the degradation of tensile properties of FRP bars. It has little effect on the elastic modulus of FRP bars. A scanning electron microscope (SEM) was used to observe the changes of steel bars and the mechanism of mechanical property degradation was studied
Preparation and luminescence properties of Tm3+-doped SrBi2Ta2O9 blue-emitting phosphor
Authors: Li Jianhua , Huang Jinyu , Liao Jing , Fu Jinjin , Deng Bin
Published: May 2021

Various novel SrBi2Ta2O9:Tm3+ blue-emitting materials were achieved via solid-state synthesis. The structure and phase purity of prepared SrBi2Ta2O9:xTm3+ (x = 0.005-0.30 mol) were examined by X-ray powder diffraction. The surface morphology of SrBi2Ta2O9:0.01Tm3+ were studied by scanning electron microscopy. Photoluminescence properties were systematically explored under the monitoring emission (λem = 468 nm) and excitation (λex = 303 nm) spectra. The optimum mole ratio of as-synthesized phosphors was 0.01 mol. The concentration quenching mechanism in the SrBi2Ta2O9 host was due to electric multipole interaction. Particularly, the chromaticity coordinates (0.1334, 0.0474) of SrBi2Ta2O9:0.01Tm3+ are near to those of the commercial BaMgAl10O17:Eu2+. These results validated the SrBi2Ta2O9:Tm3+ phosphor can be utilized good blue-emitting candidate for W-LEDs.
Case analysis of integrated maintenance technology for multi-dimensional rapid detection and trenchless reinforcement
Authors: He Yunwu , Liu Tao , Wang Tao , Liang Xiayi , Wei Hanxin , Zheng Zhigang , Xiao Xin
Published: May 2021

China’s highway construction has moved from “construction-oriented” to the development stage of “equal attention to construction and maintenance”. The infrastructure represented by urban expressways, under heavy and complex traffic loads, is prone to a variety of diseases that take place in the middle and lower layers of pavement such as “frost boils” and “voids”, which cannot be repaired ideally with the help of conventional detection and treatment techniques. In order to solve the above problems, this paper adopts nondestructive testing plans such as ground penetrating radar and falling weight deflectometer to conduct multidimensional rapid detection of the road surface to obtain the image information and mechanical data of the road structure. Based on the improved calculation method, the pavement disease area, depth and type can be effectively judged. Combined with the observation of water level, the polymer grouting reinforcement plan is designed to eliminate the problems in the middle and lower layers of the road surface. It can effectively reduce the incidence of diseases in the upper layer of the sidewalk, and significantly improve the efficiency and service level of the sidewalk.
Exact solutions of interfacial cracking problem of elliptic inclusion in thermoelectric material
Authors: Du Xin-Kun , Zhang Ya-Li , Ding Sheng-Hu
Published: May 2021

In the present work, the problem for elliptical inclusion with interfacial crack in thermoelectric material is studied. The inclusion and matrix are assumed to be imperfect bonding, which is subjected to uniform heat flux and energy flux at infinity. The interfacial cracking problem of elliptic inclusion in thermoelectric material is investigated by using conformal mapping and complex function method. The complex expressions of temperature field and electric field in inclusion and matrix are obtained. The energy release rate of thermoelectric material under the influence of inclusion is given. The effects of elliptic inclusion with interfacial crack on temperature field and electric potential also are compared by numerical examples. The results show that inclusion reduces the conversion efficiency of thermoelectric material.
Evaluation and Research on Some Pilot Smart Cities
Authors: Gong Fang , Cao Xueni
Published: May 2021

This paper, taking 30 pilot smart cities as the research objects, firstly presents a reasonable and comprehensive evaluation index system of smart city development from six aspects. Secondly, factor analysis method was used to reduce the dimension of 23 indicators, and 7 common factors and their weights were obtained. The total score of 30 cities’ development status is ranked by the use of common factor and index data. The K-means clustering method makes cluster analysis on 30 cities, and divides each city into 4 categories according to the development situation of the indicators. Finally, based on the evaluation results, the author gives some suggestions on the construction of smart city.
Research on prevention and traceability management of COVID-19 in cold chain logistics
Authors: Li Sicong , Ye Jing
Published: May 2021

Though COVID-19 spreads, China’s meat and other fresh food imports demand is still strong. The safety risk of imported fresh food carrying COVID-19 is increasing. Although China continues to improve the epidemic prevention and control and disinfection measures for imported fresh food, there are still many risk points for the spread of COVID-19 in the whole process of cold chain logistics. Through the construction of transportation monitoring platform, strengthening the collaborative management and control of management departments, optimizing the operation mode of imported food cold chain, improving the level of information intelligence, strengthening policy support and publicity guidance, accelerating the cultivation of leading enterprises and other measures, we can further strengthen the epidemic prevention and control and traceability management of China’s cold chain logistics, and ensure the safety of fresh food circulation.
Research on the Profit Model of “Internet+ Logistics Park”
Authors: Meng Xiangru , Sun Jianmeng , Wang Haining
Published: May 2021

The operation and management mode of “Internet+ Logistics Park” ecosphere has long-term and stable core competitiveness. This paper studies how to obtain the corresponding economic benefits from the perspective of the operators of the logistics park. The logistics park chooses the appropriate logistics service and the public service function to obtain the corresponding economic benefit. The development of the logistics park will finally be implemented to the profit of the park. The paper puts forward the profit model of “Internet+ Logistics Park” ecosphere; This paper mainly analyzes five modes: logistics integration mode, platform operation mode, resource integration mode, service delivery mode and chain replication mode; This paper makes a comparative analysis of different profit models from the aspects of model characteristics and profit thinking.
The spatial distribution characteristics, influencing factors and development models of rural tourism in China
Authors: Lei Jia , Liu Yanhong
Published: May 2021

As an essential support for rural revitalization and global tourism strategies, rural tourism has a lot to do in the dual-cycle development pattern. Based on the first and second batch of crucial rural tourism villages in the country, the nearest neighbor index, geographic concentration index, Gini coefficient, standard deviation ellipse, nuclear density and other methods are used to analyze their spatial distribution types, spatial balance, spatial pattern and evolution. Then, the factors influencing the distribution differences are analyzed by using the tools of geographic connection rate and buffer zone. From a configuration perspective, QCA is used to explore the development model of crucial rural tourism villages. The results show that: ①China’s rural tourism crucial villages along the Hu Huanyong line show a condensed distribution characteristic of “sparsely located in the southeast and sparsely northwest”. The distribution within the provinces is weakly concentrated and the spatial imbalance is prominent. Morover, the spatial pattern is evident from the Northeast to the Southwest and shows the insense evolution trend. ②The crucial rural tourism villages are spatially formed with the dual-core radiation and multi-regional structural features centered on the Beijing-Tianjin-Hebei, Yangtze River Delta, and supplemented by several sub-high-density areas such as Guanzhong, Sichuan, Chongqing, Guizhou, and Pearl River Delta, and finally formed the radiation pattern of urban agglomerations-central cities-crucial rural tourism villages. ③Natural geography, source market, transportation environment, economic level, and endowment of tourism resources are important factors that affect the spatial distribution of crucial rural tourism villages. ④There are three main development models of crucial rural tourism villages in China: source market-driven, traffic-oriented and scenic-radiant.
Research on the Development of Rail Transit Based on Cluster Analysis
Authors: Lang Guoling
Published: May 2021

This article analyzes the current development status of rail transit in various cities in China. Most cities are still dominated by subways. Then the relevant data is processed to obtain the linear relationship between transfer stations and rail mileage, rail stations and summarize the domestic rail Establish quantitative standards and conclude that rail transit has not yet become a transportation network. Then use the five indicators of line mileage, number of stations, number of interchange stations, average daily passenger volume, and passenger transport intensity to cluster the domestic urban rail transit using the method of cluster analysis, combining spatial Euclidean distance and compactness and other indicators Analysis, the classification results obtained have certain reference value.
Load calculation and strength analysis of floating garbage cleaning equipment
Authors: Xu Weiyao , Guo Jianting , Ji Chunyan
Published: May 2021

In order to alleviate the problem that there is increasingly floating garbage pollution on the sea, this paper proposes a new design of floating garbage cleaning equipment. This equipment is a slender structure, and whether its structural strength can meet the design requirements requires special attention. In order to ensure the rationality and safety of the design, load calculation and strength analysis are carried out based on the design wave method. The calculation results show that the longitudinal torque load of this equipment is the largest, which is 2.5 times of the second largest vertical bending moment. At the same time, there are three large stress areas in the floating structure, which are the connection between the pontoon and the connecting buntons, the connecting buntons intersecting with the Y axis and the pontoons on both sides. For the abovementioned high-stress areas, a structural strengthening plan is proposed. After the improvement, the stress in the high-stress areas of the structure is significantly reduced, with a maximum reduction of 52%. The strength of the improved structure meets the design requirements. The research results of this paper can provide relevant references for the development of floating garbage cleaning equipment in the future.
Evaluation of Green Total Factor Productivity of China’s Tobacco Manufacturing Industry Based on DEA-Malmquist Index Method
Authors: Qu Xiaoyu , Wang Ziyue
Published: May 2021

Using panel data from China’s tobacco manufacturing industry from 2014 to 2018, the DEA-Malmquist method is used to measure the green total factor productivity of China’s tobacco manufacturing industry on the basis of comprehensive consideration of environmental pollution and energy consumption. The study found that from 2014 to 2018, the Malmquist index of green total factor productivity of China’s tobacco manufacturing industry basically showed a fluctuating upward trend; the technical level of 2014-2017 needs to be improved, and the technical level of 2017-2018 has begun to improve.
Research on evaluation of port railway collection and transportation system
Authors: Shang Chuanjing , Li Ziwei , Wang Juan , Liu Guoliang , Du Xiaodong
Published: May 2021

Ports play an essential role in economic and trade, which is an important node and hub in cargo transportation. The important evaluation index of port competitiveness is the efficiency of port collection and distribution system. This paper analyzes the development trend of port collection and distribution system. According to the principle of establishing evaluation index, a reasonable evaluation index system of port collection and transportation system is constructed. The port collection and distribution system as a whole. The index system of port transportation capacity, service level, coordination ability with port and external conditions are constructed. Finally, the paper analyzes the operation process of collection and distribution system of Port A
Research on Safety Level Evaluation of Island-type Petrochemical Park Based on ANP
Authors: Guo Qianyu , Guo Jian , Hong Bingyuan
Published: May 2021

The inherent dangers of the petrochemical industry and the extreme meteorological conditions in the coastal areas make the island-type petrochemical parks have complicated safety hazards. In order to improve the safety management capability of my country’s island-type petrochemical parks, this paper analyzes the risk sources of the island-type petrochemical parks from the four subsystems of human, machine, environment and management, and uses the network analytic hierarchy process (ANP) to calculate the correlation weights between the indicators. The establishment of an evaluation model for the safety level of island-type petrochemical parks and quantitative analysis of the safety level of island-type petrochemical parks are of great significance for guiding the safety work of my country’s island-type petrochemical parks.
Practical Research on Protection and Utilization of Urban Spatial Water Elements from the Perspective of Healthy Cities
Authors: Yang Jiao , Shi Chen , Jingcheng Yuan
Published: May 2021

The healthy development of urban elements would be important to sustainable urban development, especially the elements of water resources. This paper discusses the key points and methods of water elements development and protection in urban design for Healthy-city, taking the design of China Ceramic Valley in Liling as an example. Based on the analysis of hydrological and geographic data, it establishes the network structure of the river system, summarizes systematic measures for the guidance and control of sponge cities, puts forward the optimization and control methods of waterfront spatial form and compiles quantitative and elastic space guidelines. The results show that the whole-scale and systematic urban design is a necessary step of urban water resources protection and utilization. It provides practical experience and process reference for urban health and sustainable development.
Research on bus elastic departure interval based on Wavelet Neural Network
Authors: Lv Zhe , Zou Jiayu , Zhao Zhongyu
Published: May 2021

In recent years, more and more people choose to travel by bus to save time and economic costs, but the problem of inaccurate bus arrival has become increasingly prominent. The reason is the lack of scientific planning of departure time. This paper takes the passenger flow as an important basis for departure interval, proposes a passenger flow prediction method based on wavelet neural network, and uses intelligent optimization algorithm to study the bus elastic departure interval. In this paper, the wavelet neural network prediction model and the elastic departure interval optimization model are established, and then the model is solved by substituting the data, and finally the theoretical optimal departure interval is obtained.
Fire and explosion analysis of filling station based on fuzzy mathematics and Bayesian network model
Authors: Chen Kezhen , Ye Jihong , Zhang Xiaofeng , Lv Qingqing
Published: May 2021

In order to explore the basic events and risk occurrence probability of fire and explosion accidents in CNG (Compressed Natural Gas) filling station, a corresponding Bayesian network risk model was established based on the fault tree of filling station. The prior probability was modified by introducing fuzzy mathematics in the process of transforming the fault tree into Bayesian network, and the posterior probability of the basic events of CNG filling station fire and explosion accidents was analyzed and calculated by GeNIe software. Finally, through case analysis, it is found out that the most dangerous factors that lead to the greatest risk of fire and explosion accidents in a filling station are: personnel misoperation, management defects, etc. After verifying the model, it shows that paying attention to the polymorphism of the base events and determining the rationality of the logical relationship between the base events can calculate the more accurate probability distribution of the base events, and at the same time provide reasonable suggestions for the accident prevention of the gas filling station.
Weibull Deterioration Rate on Integrated Cold Chain Inventory Performance
Authors: Mou Jin-Jin , Jiang Ying-Mei
Published: May 2021

Different from the previous articles on multi-echelon deteriorating inventory, this paper explains the economic implications of Weibull parameters for cold chain inventory rather than restricting to mathematical sense. A case study shows that DC warehousing activities and total throughput of the scale factor has a significant effect on the total profit compared with the storage technology and warehousing environment of shape factor. The improvements of DC warehousing standard and total throughput and preservation technology and warehousing environment contribute to the reduction of some DC operation costs and the increase of DC processing and customizing profit.
Research on Regional Trunk Logistics Operating Cost
Authors: Tian Benfang , Kong Yanyan , He Yingjie , Xiao Haoyu , Yuan Xingao , Li TaiJi , Li Bin
Published: May 2021

In order to ensure the balance of trunk transportation resources, logistics enterprises generally require transport vehicles to return to the initial distribution after completing the transportation task, so as to facilitate the next phase of transportation operations. Most logistics enterprises waste the trunk transportation resources in the whole process of logistics transportation. At this time, we need to choose a comprehensive transportation network optimization method to improve the vehicle loading rate, reduce the transportation cost, and design a new form of trunk transportation network. The article analyzes the operation flow of trunk transportation logistics.
Study on treatment method of low efficiency well in S12 block
Authors: Zhang Changyan
Published: May 2021

In recent years, the production decline of some oilfields is obvious, and a large number of oil wells begin to be in inefficient or ineffective production. Only by controlling these wells can the oilfields maintain effective production. By means of dynamic and static multidisciplinary integrated research, through elaborate dissection of typical potential blocks, the optimal treatment measures are selected from four aspects of “ reservoir heterogeneity and production status, type and distribution law of remaining oil, causes of low efficiency wells, classification and comprehensive treatment countermeasures and methods”, so as to provide technical support for potential tapping and comprehensive treatment of old oilfields.
An Analysis of the Spatio-temporal Characteristics of Hotels’ Network Attention -Taking Xi’an three-star and above hotels as an example
Authors: Duan Zhaowen , Sun Hanyu , Xie Shan , Zhang Tingwei
Published: May 2021

Network attention is the degree of public attention to things on the Internet. With the rapid development of Web 2.0, the network attention of hotels on the tourism network platform has become an important reference for tourists to select an appropriate hotel. Based on the above, taking 371 hotels with three stars and more in Xi’an as the research object and gathering the data of hotels’ network attention from www.ctrip.com., we explore the temporal and spatial characteristics of hotels’ network attention. The result shows that: (1) From 2016 to 2018, due to the development of hotel online booking business, Consumers’ attention to Xi’an three-star and above hotels on www.ctrip.com. has increased significantly; (2) With the Bell and Drum Tower business district as the core, the spatial distribution of network attention of hotels with three stars and above in Xi’an presents the pattern of “large agglomeration and small dispersion”; (3) The network attention of different levels of hotels has obvious differences in spatial agglomeration;
A facile synthesis of Co-doped g-C3N4 catalyst to activate peroxymonosulfate for organic pollutants degradation under visible light
Authors: Chi Fangli , Ai Shengshu , Wang Fan , Ji Xiaona , Bian Dejun
Published: May 2021

Co-g-C3N4 catalyst was prepared by a simple calcination method using melamine and Co(NO3)3·6H2O as precursors. X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) were used to characterize the prepared samples. The results indicated the Co species are successfully coordinated with g-C3N4. Degradation experiments showed that Rhodamine B can be degraded effectively at a very low cobalt doping concentration (0.2 wt %). The enhanced catalytic activity may result from the synergistic effect of visible light photocatalysis and sulfate radical based Co-g-C3N4/PMS system.
Research on the Pollution Characteristics of Pavement Runoff of the Expressway Project in Qiandao Lake District
Authors: Zhao Wei , Xu Jianfu , Zhang Dong , Ma Jianrong
Published: May 2021

This research focuses on the Expressway Project of Qiandao Lake District, investigates the meteorological conditions, traffic volume, as well as the relationship between the quality of runoff at drainage facilities and the asphalt concrete pavement and sewage discharge rules through artificial rainwater and natural rainwater, studies and determines the time scale of the initial rainwater flow on the expressway and the spatial scale that needs to be collected and processed.
A study on carbon emission calculation of residential buildings based on whole life cycle evaluation
Authors: Shang Mei , Geng Haochen
Published: May 2021

The whole life cycle carbon emission of buildings was calculated in this paper. Based on the whole life cycle evaluation theory, a carbon emission calculation model was established by using a single urban building as an example. The whole life cycle building of carbon emission calculation includes five stages: planning and design, building materials preparation, construction, operational maintenance, as well as dismantlement. It provides a reference for standardizing the calculation process of building carbon emissions by analyzed the carbon emissions and composition characteristics of each stage of the life cycle of the case house. The calculation results demonstrate that the carbon emission during the operational maintenance and building materials preparation stages in the whole life cycle of the building account for 78.05% and 20.59% respectively. These are the two stages with the greatest emission reduction potential.
Research on the Boundary Identification Method of Concealed Geological Bodies Based on Non-seismic Geophysical Data—— Taking Benxi-Xiuyan Area as an Example
Authors: Yang Mingli , Xue Linfu , Ran Xiangjin
Published: May 2021

In the process of deep geological structure research, gravity and aeromagnetic anomaly data are often used to invert the distribution law of concealed geological bodies. In order to reveal the boundaries of concealed geological bodies and divide structural divisions, this paper adopts fuzzy control simulated annealing genetic algorithm () to superimpose the gravity and aeromagnetic anomaly data in Benxi-Xiuyan area and classify the patterns, and identify the main geological body boundaries and fractures. Comparing the relationship with known geological maps, the two have a higher degree of matching. Experiments show that the application of SAGAFcm algorithm can quickly identify the boundaries of concealed geological bodies and provide a new means for field geological mapping.
The land surface mildly contaminated by Hg
Authors: Yang Dongfang , Li Haixia , Lin Dong , Zhang Longlei , Wang Qi
Published: May 2021

The Hg content in the waters of Jiaozhou Bay was within 0.010-0.060μg/L in May, September and October 1993, which conforms to the seawater quality standards of Class I and II. It indicates that in the entire waters of Jiaozhou Bay, there were some water areas that did not get contaminated by Hg while some areas got mild contamination by Hg in May, September and October. In May, the variation range of Hg content in the waters of Jiaozhou Bay was 0.010-0.046μg/L. In September, it ranged within 0.007-0.011μg/L. And in October, the content of Hg detected in the waters of Jiaozhou Bay was 0.060μg/L. There were three sources to transport Hg content, open sea currents, Licun river and the surface runoff. The Hg content from the transportation of open sea currents was 0.046μg/L, from the Licun river was 0.011μg/L and from the surface runoff was 0.060μg/L. This paper builds a model block diagram to present the different paths and Hg contents that were input in the Jiaozhou Bay. In May, the open sea currents did not get any contamination of Hg; in August, the Licun river did not get any contamination of Hg as well; while in September, the surface runoff was mildly contaminated by Hg. The author concluded two points about the migration of Hg content: 1) Human activities discharge Hg to the land so that the Hg content could directly run to the ocean through the surface runoff. As the Hg content transported by surface runoff was relatively high, it resulted that the nearshore waters got mild contamination of Hg content. On the other hand, the surface runoff transported Hg to rivers, resulting relatively low content of Hg. Then rivers delivered the Hg content to nearshore waters, leading to a non-contaminated condition of rivers. 2) Human activities input Hg content to the ocean in a long period, resulting the increase of Hg content in the ocean. As the accumulation of Hg content in the ocean, the ocean got close to the mild contamination status.
Study on the Causes of Water Environmental Pollution of Important Rivers in Haihe River Basin and Countermeasures
Authors: He Xu , Siyan Hou
Published: May 2021

The water quality of six important rivers in Haihe River Basin, including Yongding River, Luanhe River, North Canal, Daqing River, South Canal and Chaobai River, was evaluated. The influence of point source and non-point source on water quality was analyzed. The causes of water environmental pollution in the major rivers were preliminarily revealed. The results show that the water quality of Chaobai River is good, and the impact of point source and non-point source discharge on the water body is small. Other rivers are affected by different degrees of point source and non-point source pollution. Based on the analysis results, the engineering measures and management countermeasures for river regulation are put forward.
Advances in application of nanomaterials in remediation of heavy metal contaminated soil
Authors: Ding Na , Han Mengxuan , He Yao , Wang Xinshuai , Pan Yuxuan , Lin Hua , Yu Guo
Published: May 2021

Soil heavy metal pollution has become an environmental problem that has attracted worldwide attention. Nanomaterials have the advantages of large specific surface area, strong adsorption capacity and high reactivity, making nanomaterials remediation technology an excellent application prospect in contaminated soil remediation. This article introduces the main classification of nanomaterials, summarizes the mechanism of nanomaterials to remove heavy metals, and the combination technology of nanomaterials. It provides a scientific reference for the further development of this field.
Research Progress on the treatment of arsenic pollution by manganese oxide
Authors: Yang Huan , Han Mengxuan , Jiang Pingping
Published: May 2021

Arsenic is a kind of protoplasmic poison, which exists widely in the natural environment. Consuming too much arsenic can cause a number of health problems. Manganese oxide plays an important role in arsenic pollution removal technology. In this paper, arsenic hazard and its treatment methods and the application of manganese oxides in arsenic pollution treatment are summarized, and the prospect of research on arsenic pollution treatment by manganese oxides is put forward.
Environmental Information Disclosure and Financial Performance – Empirical Evidence from Heavily Polluting Industries in China
Authors: Shen Jianfei , Chen Yidan
Published: May 2021

Focusing on the quality of corporate environmental accounting information disclosure (EID), this paper attempts to explore the impact of financial performance on environmental information disclosure. We take listed companies in Chinese heavily polluting industries as the research object, and construct a multiple regression model for data analysis via SPSS. According to Chinese practice, we divide the financial indicators into four areas: solvency, operating capacity, profitability and development capacity, and select four indicators to represent them. The empirical results show that net working capital, current asset turnover and equity growth rate are positively correlated with EID, and return on total assets is negatively correlated with EID. This result means that the solvency, operating ability and development ability in financial performance can promote the improvement of EID, but profitability cannot.
Research on Mountain City Mountain and Water Repair Strategy
Authors: Deng Hong , Long Junjie
Published: May 2021

The natural ecological environment is not only the basic condition of our human existence, but also the foundation of urban construction. The natural ecological environment restricts the development of cities. However, the mountains and water bodies of mountainous cities have been damaged to varying degrees in the past urban construction. Through the analysis of the current water bodies and mountains in mountainous cities, this paper puts forward the strategies for the restoration of mountains and water bodies, so as to realize the overall restoration of urban ecology.
Sandwich materials with a crumpled aluminium core
Authors: Bouaziz Olivier , Bouafif Rabeb , Massion Roxanne
Published: May 2021

Sandwich materials made of two aluminum sheets and a crumpled aluminum core have been manufactured for the first time using a reproducible process. This very specific core aims to drastically improve the elasticity performance indexes of the sandwich. The structure has been studied mainly in bending.
Study on corrosion resistance behavior and formation mechanism of Ce conversion coating on manganese
Authors: Lei Sihua , Lu Fei , Wang Shuai , Zhong Hong , Cao Zhanfang , Huang Xiaoping
Published: May 2021

Ce conversion coatings have received extensive attention from researchers due to their excellent corrosion resistance and environmental friendliness. Here, Ce conversion coatings on manganese were prepared by treating in the cerium nitrate conversion solution. The influence of treating parameters was studied and optimized. The surface morphology, element composition and chemical state of Ce conversion coatings were studied by means of SEM, EDS, XRD and XPS. Electrochemical methods of polarization curve and electrochemical impedance were used to study the corrosion resistance of conversion coatings. The results showed that the Ce conversion coating contained mainly Mn, O and Ce, and its forms were manganese oxide and cerium oxide. Electrochemical tests showed that Ce conversion coating can not only effectively improve the corrosion resistance of manganese substrate, but also has good acid and alkali resistance. Discussion on the formation mechanism of cerium conversion coating shows that the conversion treatment is beneficial to inhibit the further oxidation of manganese to the higher valence state.
Optimizing MgO distribution between sinter and pellet based on melting behavior and interaction
Authors: Bai Kaikai , Pan Yuzhu , Wang Jingsong , Zuo Haibin , Xue Qingguo
Published: May 2021

During blast furnace ironmaking, MgO flux is added to the sinter or pellets to reduce the viscosity and improve the desulfurization capacity of the slag. The distribution of total MgO addition between the sinter and pellets affects the interaction between the ferrous burdens. Inappropriate interaction between different burdens promotes the formation of an excessive amount of low-melting-point liquid phases, which reduces the permeability of the cohesive zone. In this study, the effect of MgO on the interaction between the sinter and pellets was visualized during heating and further investigated using thermodynamic calculations. A new concept named the distribution index of MgO was proposed for optimizing the MgO distribution between the sinter and pellets. A trade-off between the permeability and interaction between burdens in the cohesive zone was observed, which can be addressed by postponing the interaction between burdens to a higher temperature (i.e., a lower part of the cohesive zone).
Performance analysis of hot metal temperature prediction in a blast furnace and expert suggestion system proposal using neural, statistical and fuzzy models
Authors: Bozkurt Erdoğan , Orak İlhami M. , Tunçkaya Yasin
Published: May 2021

Blast Furnace (BF) production methodology is one of the most complex process of iron & steel plants as it is dependent on multi-variable process inputs and disturbances to be modelled properly. Due to expensive investment costs, it is critical to operate a BF by reducing operational expenses, increasing the performance of raw material and fuel consumptions to optimize overall furnace efficiency and stability, also to maximize the lifetime. The chemical compositions and temperature of hot metal are important indicators while evaluating the operation, therefore, if the future values of hot metal temperature can be predicted in advance instead of subsequent measuring, then the BF staff can take earlier counteractions on several operational parameters such as coke to ore ratio, distribution matrix, oxygen enrichment rate, blast moisture rate, permeability, flame temperature, cold blast temperature, cold blast flow and pulverized coal injection rate, etc. to control the furnace optimally. In this study, Artificial Neural Networks (ANN) model is proposed combined with NARX (Nonlinear autoregressive exogenous model) time series approach to track and predict furnace hot metal temperature by selecting the most suitable process inputs and past values of hot metal temperatures using the real data which is collected from the BF operated in Turkey during 2 months of operation. Various data mining techniques are applied due to requirements of charge cycling and operating speed of the furnace which secures novelty and effectiveness of this study comparing previous articles. Furthermore, a statistical tool, Autoregressive Integrated Moving Average (ARIMA) model, is also executed for comparison. ANN prediction results of 0.92, 8.59 and 0.41 are found very satisfactory comparing ARIMA (1,1,1) model outputs of 0.73, 97.4 and 9.32 for R2 (Coefficient of determination), RMSE (Root mean squared error) and MAPE (Mean absolute percentage error) respectively. Consequently, an expert suggestion system is proposed using fuzzy if-then rules with 5 × 5 probability matrix design using the last predicted HMT value and the average of the last 5 HMT values to decide furnace’s warming or cooling movements state in mid-term and maintain the operational actions interactively in advance.
Anatomical Considerations of Embryology and Development of the Musculoskeletal System: Basic Notions for Musculoskeletal Radiologists
Authors: Aparisi Gómez Maria Pilar , Watkin Sheryl , Perry David , Simoni Paolo , Trisolino Giovanni , Bazzocchi Alberto
Published: May 2021

The musculoskeletal (MSK) system begins to form in the third week of intrauterine development. Multiple genes are involved in the complex different processes to form the skeleton, muscles and joints. The embryonic period, from the third to the eighth week of development, is critical for normal development and therefore the time when most structural defects are induced. Many of these defects have a genetic origin, but environmental factors may also play a very important role. This review summarizes the embryology of the different components of the MSK system and their configuration as an organ-system, analyzes the clinical implications resulting from failures in the process of organogenesis, and describes the first approach to diagnosis of skeletal abnormalities using prenatal ultrasound.
Pediatric Musculoskeletal Trauma: Upper Limb
Authors: Restrepo Ricardo , Cervantes Luisa Fernanda , Zahrah David , Schoenleber Scott , Lee Edward Y.
Published: May 2021

Pediatric upper extremity injuries, acute and chronic due to overuse, are commonly encountered in the clinical setting. However, interpretation of imaging studies is often challenging in pediatric patients because of changing postnatal skeletal development and the broad spectrum of pathology that can potentially occur. This article discusses normal skeletal development and the pathomechanics of skeletal injuries in pediatric patients. It also outlines a framework for imaging as it pertains to the pediatric upper extremity, with specific emphasis on acute and chronic injuries to the shoulder, elbow, forearm, and wrist.
Imaging of Congenital Skeletal Disorders
Authors: Aparisi Gómez Maria Pilar , Trisolino Giovanni , Sangiorgi Luca , Guglielmi Giuseppe , Bazzocchi Alberto
Published: May 2021

Osteochondrodysplasias are the result of the expression of gene mutations. The phenotypes in osteochondrodysplasias evolve through life, with the possibility that previously unaffected bones may be involved at later stages of growth. Due to the variable time of onset, the diagnosis may be made prenatally, at birth, or later. Certainty in the diagnosis is sometimes only achieved as the patient matures and the disease evolves. Radiographic evaluation is a fundamental part of the diagnostic work-up of congenital skeletal disorders and in most cases the first tool used to arrive at a diagnosis. This review describes the imaging characteristics, specific signs, and evolution of several skeletal dysplasias in which diagnosis may be directly or indirectly suggested by radiologic findings. A definitive accurate diagnosis of a congenital skeletal abnormality is necessary to help provide a prognosis of expected outcomes and to counsel parents and patients.
Imaging of Pediatric Bone Tumors and Tumor-like Lesions
Authors: Al-Qassab Sinan , Lalam Radhesh , Botchu Rajesh , Bazzocchi Alberto
Published: May 2021

Bone lesions are commonly seen when reporting pediatric skeletal imaging. Distinguishing aggressive from nonaggressive lesions is essential in making the diagnosis. Not all aggressive lesions are neoplastic; indeed, osteomyelitis frequently presents with aggressive appearances and is far more commonly seen in the pediatric population than neoplastic lesions. In this article, we discuss an approach for the diagnosis of pediatric bone tumors and tumor-like conditions. The most common pediatric benign and malignant bone tumors are discussed in more detail.
Imaging of Pediatric Lower Limb Sports Injuries
Authors: Weil Nikki , Hemke Robert , Reurink Guus , Maas Mario
Published: May 2021

The importance of physical activity during childhood and adolescence has come to light, with an increase in sports-related acute traumatic and overuse injuries as a major disadvantage. A solid understanding of the physiology of the growing skeleton, together with knowledge about age- and sex-related differences in the occurrence of acute traumatic and overuse injuries is necessary. Every musculoskeletal radiologist should also be familiar with the appearances of these injuries on different imaging modalities. This review focuses on all these aspects concerning acute traumatic and overuse injuries among children and adolescents.