bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study on the breaking of A-IX-2 explosive by submerged cavitation water jet
Authors: Zhang Y X , Lian P , Kang C , Chen S 
Published: January 2021

Abstract
It was investigated to break A-IX-2 explosive using the submerged cavitation water jet for emptying scrapped ammunitions charged A-IX-2 explosives. The Split Hopkinson pressure bar (SHPB) tests were firstly accomplished for A-IX-2 explosive to obtain its stress-strain mechanical properties. The breaking effect and its mechanism of the submerged cavitation water jet were investigated. The broken A-IX-2 explosives were tested by scanning electron microscope (SEM) to analyze the mesoscopic mode of cavitation water jet breaking A-IX-2 explosive. Finally, the internal temperatures of A-IX-2 explosive during the whole impact process were detected. The results showed that A-IX-2 explosive exhibits strain rate effect. The submerged cavitation water jet is available to use to empty ammunition charged A-IX-2 explosive and the maximum particle size is no more than 3cm. The fragmentation of the explosive by the submerged cavitation water jets is mainly caused by the combined action of micro-jets and shock waves generated by the collapse of cavitation bubbles. The mesoscopic mode is mainly the separation of crystals from binder and aluminum powder. The temperature change of A-IX-2 explosive in the whole process is about 20 °C.
Characteristics and experimental study of radar scattering foil
Authors: Xu W D , Yang J T , Yang X , Zhang Y , Zhou L 
Published: January 2021

Abstract
Aiming at the current situation that Doppler radar can use the echo frequency difference to avoid the interference of chaff and chaff clouds, by studying the average radar scattering cross section, bandwidth characteristics, horizontal drift speed, polarization characteristics of the foil. The performance of the Paller effect, etc., examined the foil’s ability to counter Doppler radar. The static test is used to test the performance of the foil. Experimental research shows that the composite foils of multiple sizes can increase the reflection loss of the composite foil and improve the interference efficiency. Uses round foil as the base material, and foil with mixed side length of 10mm can enhance the loss performance under various polarization conditions.
Analysis of the operational characteristics of the US Aircraft Carrier Battle Group
Authors: Shan Yongzhi , Huang Degang 
Published: January 2021

Abstract
According to the operational requirements of attacking the US Aircraft Carrier Battle Group, its defense capabilities are analyzed in this paper. Furtherly, the disadvantages of the defense capabilities are studied, and the effective means of defensive counterattack against the US Aircraft Carrier Battle Group are raised, which can be utilized to guide the operational applications of airborne weapons.
Systematic approach of guidance information reconstruction of laser strapdown guidance air-to-ground missile
Authors: Wang Dong , Chen Yun 
Published: January 2021

Abstract
The decoupling algorithm of laser strapdown guidance which can effectively suppress the disturbance rejection rate problem and a method of extracting line of sight angle rate are studied. Firstly, the decoupling mathematical model of strapdown seeker is established, the cause of the disturbance rejection rate problem of strapdown guidance is analyzed, and the time synchronization algorithm is designed to reduce the coupling of the attitude motion of the missile to the guidance information. Secondly, an extraction algorithm of line of sight angle rate is established, an extraction algorithm of filter parameters changing with the remaining flight time is designed to suppress the attitude oscillation of the initial phase of terminal guidance and improve the tracking speed of the last phase, and the extracted line of sight angle rate is compared with the output characteristics of the platform seeker. Finally, the effectiveness of the proposed line of sight angle rate extraction algorithm is verified by six degrees of freedom trajectory simulation, and the influence of disturbance rejection rate parasitic loop on strapdown terminal guidance accuracy is analyzed by simulation.
Identification of clandestine groundwater pollution source locations and their release flux history
Authors: Chakraborty A , Prakash O 
Published: January 2021

Abstract
Large numbers of untreated toxic wastes are often buried underground, as a method of disposal. Such methods of clandestine disposal have led to widespread pollution of groundwater resources. These methods of wastes disposal are often adopted to avoid the cost incurred in proper treatment of the waste and untraceability of such clandestine disposals. However, the effect of such disposals manifests in form of groundwater pollution, which if left unchecked would potentially pollute the entire aquifer. Such polluted aquifers need to be reclaimed by implementing proper remediation techniques. However, the effectiveness of any remediation technique would depend on the precise knowledge of the unknown pollutant source/s characteristics, in terms of their Numbers, their Locations and their Release Flux history referred to as NLRF. This study presents a noble technique for simultaneously estimating the unknown number of clandestine pollutant sources, their locations along with their release flux history. Simulated Annealing (SA) is used in Linked Simulation Optimization (LSO) based framework. In this developed methodology, the number of sources and their respective locations and release flux histories are treated as unknown decision variables, and are estimated simultaneously along with the source release flux history.
Analysis on the characteristics of eye movement and the evaluation of psychological perception for forest waterscape space
Authors: Gao Y , Sun X M , Zhang T , Zhan H 
Published: January 2021

AbstractFor landscape architects, how to provide a highly quality forest landscape for visitors has always been an important topic. This study based on the results of previous field observation, combined with eye tracking technology and psychological perception questionnaire, and used the Wilcoxon rank sum test, T test and Spearman’s rho correlation analysis in SPSS 23.0 to statistically analyze the data. The main purpose is to clarify the relationship between visual behavior characteristics and psychological perception evaluation of the forest waterscape space where tourists have more behavioral evaluations during forest walk. Main results are as follows: 1. There are differences eye movement behaviors of different types of forest waterscape space, especially in the visual span; 2. There are significant differences visitor’s psychological evaluation of different types of forest waterscape in five indices, which in whether the landscape content is changing, whether the color is rich, whether the color is bright, whether the space is open and whether you can see the distant landscape; 3. There is a correlation between human eye movement behavior and psychological perception evaluation in different types of forest waterscape spaces. The scenes with a large number of fixations also have higher satisfaction, and fixations count have positively correlated with the spatial perception evaluation results, which including plant diversity, landscape richness, permeability and the layering. That is to say, richness of landscape elements and color, permeability of the space and the regularity of the forest waterscape space affect the participants’ eye movement observation mode. Through the above analysis, we suggest that in the planning and design of forest waterscape space should be considerate the characteristics of different landscape elements, meanwhile we should pay attention to the interspersion of appropriate heterogeneous landscape space.
Precipitation distribution and forecasting in hurricane ‘Hermine’
Authors: He J Y , Zhu X G 
Published: January 2021

Abstract
Retrievals and forecasting of precipitation based on FY-3C microwave humidity and temperature sounder (MWHTS) are carried out to validate the possibility of microwave sounder in meteorological applications. Different from current research, a novel idea combining radiative transfer theory and historical statistical method is presented. Hurricane Hermine (the first hurricane to make landfall along the apalachee bay coast Since 1966) as a study case is chose to analyse the precipitation distribution and give forecasting results in 72 hours.
Study on the impact of tourism quality perception on tourists’ environmentally responsible behaviour in rural tourism areas
Authors: Yin L J , Zhang N , Chang Z Y 
Published: January 2021

Abstract
Most of existing research on tourists’ environmentally responsible behaviour (ERB) focused on natural tourism and eco-tourism, but there is little research result on rural tourism. This paper constructs a structural equation model with satisfaction as a mediating variable to study the impact mechanism of tourism quality perception (TQP) on tourists’ ERB in rural tourism areas. Through exploratory factor analysis, TQP is divided into three dimensions: resource quality perception, service quality perception, image quality perception; ERB is divided into two dimensions: compliance ERB and active ERB. The case study results in the Shitangrenjia rural tourism area of China show that TQP indirectly affects ERB with satisfaction as the mediating variable; the impact of TQP on the active ERB is significantly greater than that of compliance ERB. In addition, there are significant differences among the different dimensions of TQP on ERB. This research confirms that the quality of rural tourism area has an important implication on tourists’ ERB, which could provide theoretical basis and decision support for the improvement of tourism quality and environmental protection of rural tourism areas.
Research on key fundamentals and technical systems of Sponge City development in China
Authors: Yang Z , Li J Q , Che W , Wang W L , Zhao Y , Zhang H Z 
Published: January 2021

Abstract
The Chinese government has promoted Sponge City construction in the last five years. The premise for a “Sponge City” was based on the problem of accumulation and rapid discharge of various stormwater and water-environment issues during the urbanization process in China. With reference to the expansion of stormwater management in other developed countries, this study summarizes related research results in China. Unlike other stormwater management systems put forward by other countries, such as low impact development, water sensitive urban design, etc., this study investigates stormwater issues at the current developmental stage in China and comprehensively considers the integrated objectives, including water ecology, water security, water resources, water environment, and water culture. Aimed at transforming the traditional extensive urbanization model, it builds on the existing integrated system at the core of stormwater management, which connects with the sewage and / or water supply, and other related systems. This study describes and summarizes the Sponge City’s key fundamentals, targets, technical systems, and extensional relations to guide the further construction of Sponge City and provide important references for other countries.
Optimization of surge tank structures in hydropower station based on VOF method
Authors: Yang Z Y , Cheng Y G , Liu K , Wang Q , Yang F 
Published: January 2021

Abstract
During transient processes of hydropower stations, large surging waves under load rejection condition and air-trapped vertical vortices under start-up condition in surge tanks are the critical factors that influence the safety of hydropower stations. In this study, model tests and volume of fluid (VOF) model based three-dimensional (3D) simulations were conducted to check the rationality of surge tank structures in transient processes, and after intensive analysis, an optimized scheme was proposed. The results show that the original scheme leads to the violent water level fluctuations in steady operation and load rejection conditions, and some air-trapped vertical vortices occur during start-up process. The air-trapped vertical vortices can provide bubbles into the penstock, which is not permitted. With the impedance orifice and bottom plate shapes changed, the optimized scheme gives limited water level fluctuations during both load rejection and start-up conditions, and eliminates the step water falling and air-trapped vortex swirling phenomena effectively, meeting the requirements of design, construction and operation.
Analysis on the thrust bearing lubrication in pumped storage unit based on fluid-solid-thermal interactions
Authors: Cao J W , Zhai L M , Guo B , Lei H M , Ahn S H , Wang Z W 
Published: January 2021

Abstract
The bidirectional thrust bearings are used to balance the thrust load of the entire shaft system which play an important role in the pumped storage units. The lubrication is usually analyzed by simultaneously solving the Reynolds equation, energy equation, film thickness equation of the film and the heat conduction equation, elastic equilibrium equation of the pad. However, in this method the assumptions for the inlet temperature of the film and the wall heat coefficients on the pad greatly affect the numerical accuracy. This study used fluid-solid-thermal interaction method, built three dimensional (3D) FEM model for the pad and collar and the 3D CFD model for the oil film, and then analyzed the influence of the thrust loads and the Babbitt layer on the bearing performance. The results show that increasing the thrust load will rapidly decrease the minimum film thickness, increase the maximum pressure and maximum temperature on the pad. Increasing the thickness of the Babbitt layer on the pad sliding surface will increase the minimum thickness of the film, decrease the maximum temperature on the pad which improve the bearing lubrication.
Analysis of Characteristics of Volatile Organic Compounds Pollution in Atmosphere in Kuitun City and Countermeasures
Authors: Wang Linna , Yang Rongjiang , Men Chunyan , Gao Li 
Published: January 2021

Abstract
The "Kui-Du-Wu" area of Kuitun City is one of the largest petrochemical bases and important economic core areas in Xinjiang. According to the online monitoring data of total volatile organic compounds (VOCs) at Kuitun site, 102 species can be detected in the urban atmospheric environment volatile organic compounds, through the analysis of the sources of the top ten compounds with average concentration values throughout the year, their main sources are chemical production, oil volatilization, fuel combustion, and motor vehicle exhaust. The prevention and control countermeasures are to strengthen source control, implement pollution source compliance management, improve the city's comprehensive management level, and establish and improve a joint prevention and control system.
Application status and prospects of biological deodorization in China
Authors: Yuan Shuai , Liu He , Liu Miao 
Published: January 2021

Abstract
With the development of urbanization, industry, agriculture and aquaculture, malodorous pollution has become increasingly serious. Odour pollutants can be produced by non-biological or biological pathways, which not only have a great negative impact on the regional ecological environment, but also cause great harm to the health of local people and animals. Compared with physical method, chemical method and adsorption method, biological deodorization method has the characteristics of high odour removal rate, environmental friendliness and low cost. Biological method is gradually becoming the preferred technique for odour removal in some odour producing areas. In this paper, the mechanism, the patent application status and the application prospect of biological deodorization are summarized and analysed, so that we can have a deeper understanding of biological deodorization.
The Impact of Polysaccharides and Flavonoids in Black Fungus on Resistance to Oxidative Stress and X-ray Environmental Radiation
Authors: Guo Li , Ma Xue , Li Yang , Wang Peng 
Published: January 2021

Abstract
The antioxidant capacity and developmental inhibition to X-ray radiation of polysaccharides and flavonoids in Black Fungus were studied by scavenging ability of free radicals and damage rate of X-ray radiation cells. The results showed that polysaccharide-flavonoid compound with mass ratio of 32.3 had a higher antioxidant effect, and antioxidant complex descended X-ray radiation cell damage rate to 10.06%. The polysaccharides and flavonoids of Black Fungus had effective protection to oxidation and X-ray environment radiation.
Prevention and Countermeasures of Urea Crystallization in SCR Urea Pyrolysis System
Authors: Su JingCheng , Xue FangMing , Li PeiPei , Zhang Yulong 
Published: January 2021

Abstract
The reasons for urea crystallization in the SCR urea pyrolysis system are analyzed, and system design, flow field control, equipment selection, process water and compressed air quality requirements and other aspects are optimized and selected, in order to improve the urea crystallization of pyrolysis furnace Phenomenon to effectively prevent and provide targeted countermeasures. In the process of pyrolysis of urea to produce ammonia, a slight deviation will easily form crystals. In severe cases, pipeline blockage and insufficient ammonia supply in the system will occur. However, based on the feedback of multiple application projects in the past ten years, there has not been a situation that has affected the operation of the pyrolysis system due to serious urea crystallization, and as long as the system design, flow field control, equipment selection, process water and compression Optimization and selection of air quality requirements and other aspects can effectively prevent and control the phenomenon of urea crystallization. The urea pyrolysis ammonia production system is a safe and effective source of ammonia, which can ensure the long-term safe and stable operation of the SCR system, so it will be more and more widely used.
Research on Urban Eco-clean Watershed in Northwest China
Authors: Shen Yongkang , Zhang Di 
Published: January 2021

Abstract
Ecological clean urban watersheds play some important roles for environment protection in Northwest China, however urban eco-clean watersheds were rarely focused on living water environment. Some technology projects and integrated management measures for water sources, urban flood disaster and living water environment are concluded by some studies on problem-oriented. Based on high quality urban development in the Huanghe river basin, some advice on cooperation development and technological measures on sponge city were suggested for cities and towns in Northwest China.
Study on the Application of PCA Data Analysis Method in Frontal Rainstorm Forecast
Authors: Wang Pin , Xiao Zongna 
Published: January 2021

Abstract
According to the principle of weather dynamics, there are three principal components affecting rainstorm, namely ascending motion, unstable condition and water vapor condition. According to these three types, the forecast factor group of rainstorm is formed. The original multi-index is transformed into a few independent comprehensive indexes by principal component analysis (PCA). After standardization of various factor indexes, the comprehensive index of rainstorm forecast is obtained based on PCA. After all kinds of factors are standardized, the comprehensive index of rainstorm forecast is obtained based on PCA. The test results show that there is a good correspondence between the rainstorm and the forecast comprehensive index, and the trend basically corresponds to the peak and valley values. The forecast of the comprehensive index rainstorm has certain indication significance. Through the comparison between each classification index and independent samples, the threshold system of rainstorm forecast is established combined with comprehensive index and circulation classification, which has reference value for the presence or absence of rainstorm process forecast and is a beneficial discussion on the quantification of weather conceptual model forecasting method.
Design of water quality monitoring platform based on Embedded System
Authors: He Yuxiao 
Published: January 2021

Abstract
This paper designs and develops an embedded aquaculture intelligent water quality monitoring system based on STM32F103VET6, serial communication module and RS485 interface circuit. The system uses sensors to collect the temperature, pH value, dissolved oxygen, turbidity and other information of aquaculture water quality in real time. Through the water quality monitoring platform established in this paper, the water quality index method is used to evaluate the water quality, so that the farmers can obtain the abnormal alarm information and water quality comprehensive situation in time, and get the water quality improvement suggestions.
Study on the Construction of a New Third-Party Governance Model for Environmental Pollution
Authors: Mo Jianjian 
Published: January 2021

Abstract
In recent years, China’s environmental pollution control focuses on public participation. As an important measure of pollution control, the marketization and specialization of pollution control is a historical trend. Some scientific research institutes and environmental protection enterprises have begun to practice the third- party governance system. Looking at the practical effect, there are many deficiencies in the current third-party governance model, mainly for the lack of promotion power of the third-party governance model, the imperfect third-party governance supervision system, and the inability to distinguish the scope of responsibility between the main body of pollutant discharge and the main body of pollution control. In this paper, from the perspective of “operation mechanism, legal relationship and central subject”, the paper creatively constructs the “three-in-one” third-party governance mode to effectively solve the problem of responsibility definition between the pollutant discharge, pollution treatment subject and the government.
Study on Stress Distribution Law and Stress Performance Characteristics of Multiple Data Mining for Harbour Portal Crane Detection
Authors: Wen Haobai , Li Yiqin 
Published: January 2021

Abstract
Taking the actual test of harbour portal crane as the sample, the evident high-stress measure points have been selected through the potential high-stress measure points, and the high-risk structure have been identified. Then stress distribution law and stress performance characteristics of the high-risk structure have been studied. The basis for the safety production of the port have been provided.
Analysis of the influence of heat source well parameters on pumping temperature of groundwater source heat pump
Authors: Min Wu 
Published: January 2021

Abstract
In this paper, MATLAB software is used to simulate the influence of parameters of different heat source wells on pumping temperature in groundwater source heat pump system. The absolute value of horizontal permeability coefficient of aquifer will not affect its pumping temperature, but when the permeability coefficient ratio increases from 1 to 10, the pumping temperature decreases by 1.1°C; When the specific heat capacity increases from 2000 kJ / m3 · °C to 3000 kJ / m3 · °C, the pumping temperature decreases by 0.8 °C; When the degree of thermal dispersion increases from 1m to 3m, the pumping temperature decreases by 0.4°C.