bluuebunny/crossref_metadata_2025 huggingface dataset:
Parent Command Use and Child Compliance During Parent–Child Interactions Including Children With Down Syndrome
Authors: Lorang Emily K. , Sterling Audra
Published: May 2021

Purpose

This study investigated maternal and paternal command use and child compliance in children with Down syndrome during mother–child and father–child free-play interactions. We also examined child compliance to direct versus indirect commands, and the relationships between maternal command use, paternal command use, child compliance, and child speech and language abilities.

Method

Fifteen families including a mother, father, and child with Down syndrome participated. Mother–child and father–child dyads participated in free-play interactions. We coded overall parent command use, command type (direct or indirect), and child compliance with the commands. Child language abilities were measured using a standardized assessment as well as during free-play.

Results

Mothers and fathers of children with Down syndrome used a similar number of commands, and children complied similarly across interactions. Children were more likely to comply with direct versus indirect commands. Parent command use was related to child language abilities in different ways for mothers and fathers. Child compliance was not related to receptive or expressive language abilities.

Conclusions

Mothers and fathers of children with Down syndrome use commands in similar ways but may base their command use on different child factors. Using direct commands with children with Down syndrome may be beneficial when increasing compliance during early interactions.
Hubble Space Telescope imaging of the extremely metal-poor globular cluster EXT8 in Messier 31
Authors: Larsen Søren S. , Romanowsky Aaron J. , Brodie Jean P.
Published: May 2021

We recently found the globular cluster (GC) EXT8 in M 31 to have an extremely low metallicity of [Fe/H] = −2.91 ± 0.04 using high-resolution spectroscopy. Here we present a colour–magnitude diagram (CMD) for EXT8, obtained with the Wide Field Camera 3 on board the Hubble Space Telescope. Compared with the CMDs of metal-poor Galactic GCs, we find that the upper red giant branch (RGB) of EXT8 is ∼0.03 mag bluer in MF606W − MF814W and slightly steeper, as expected from the low spectroscopic metallicity. The observed colour spread on the upper RGB is consistent with being caused entirely by the measurement uncertainties, and we place an upper limit of σF606W − F814W ≈ 0.015 mag on any intrinsic colour spread. The corresponding metallicity spread can be up to σ[Fe/H] ∼ 0.2 dex or > 0.7 dex, depending on the isochrone library adopted. The horizontal branch is located mostly on the blue side of the instability strip and has a tail extending to at least MF606W = +3, as in the Galactic GC M 15. We identify two candidate RR Lyrae variables and several ultraviolet-luminous post-horizontal-branch and/or post-asymptotic-giant-branch star candidates, including one very bright (MF300X ≈ −3.2) source near the centre of EXT8. The surface brightness of EXT8 out to a radius of 25″ is well fitted by a Wilson-type profile with an ellipticity of ϵ = 0.20, a semi-major axis core radius of 0.″25, and a central surface brightness of μF606W, 0 = 15.2 mag arcsec−2, with no evidence of extra-tidal structure. Overall, EXT8 has properties consistent with it being a ‘normal’, but very metal-poor, GC, and its combination of relatively high mass and very low metallicity thus remains challenging to explain in the context of GC formation theories operating within the hierarchical galaxy assembly paradigm.
Grey relational analysis for Energy Storage Service Provider Influencing Factors
Authors: Wang Qiang , Wang Jiaxin , Liu Haiying , Liu Xin , He Jiaoyu
Published: May 2021

China faces the problems of abandoning wind and light and environmental pollution. Energy conservation and emission reduction as a new technology can effectively solve the above problems. In the process of building a Energy Storage Services project, the issue of Influencing Factors is the focus of attention. Aiming at the problem of Influencing Factors in Energy Storage Services systems, a Influencing Factors method based on gray correlation analysis is proposed. Adopting this method, one can avoid the influence of subjective factors on weight assignment through grey correlation analysis. Grey relational analysis can objectively analyze the proportion of each index in supplier’s production consideration
Carbon emission reduction technologies in China
Authors: Zhang Xintong , Fu Longshan , Huang Yu
Published: May 2021

Environmental pollution is mainly caused by carbon emissions, so carbon emission reduction is our top priority now. Carbon-containing greenhouse gas emissions mainly come from the following aspects: (1) fossil fuel combustion; (2) leakage and volatilization in the process of fuel extraction, processing, transportation, and industrial utilization; (3) traditional biomass fuel combustion. The greenhouse effect will cause an increase in temperature, the rise of sea level, and the reduction of biodiversity. Due to little or no carbon emissions, new energy is a current research direction. It mainly includes wind energy, solar energy, hydropower, nuclear energy, and biological energy. Among them, wind power technology is quite mature, and the cost of wind power has become competitive in the market. Solar energy is an inexhaustible, nonpolluting, renewable, and clean energy source, which is gradually entering the stage of large-scale development. Hydropower is clean energy, renewable, pollution-free, and low operating costs. Nuclear energy is characterized by high efficiency and low carbon, coming from the fission energy released by the fission reaction of the fissionable material (nuclear fuel) in the nuclear reactor. Biomass resources can be divided into four categories: forest resources, crop straws, poultry manure, and household garbage, and its biggest feature is its renewability. Besides, carbon capture and carbon storage are other ways to reduce carbon emissions. Carbon capture uses chemical adsorption, physical adsorption, adsorption separation, and membrane separation to capture carbon dioxide. Carbon storage injects supercritical CO2 into a closed geological structure containing oil, gas, water, or non-commercial coal seams through pipeline technology to form long-term or permanent CO2 storage
Research on electric vehicle load forecasting based on travel data
Authors: Xu Lin , Wang Bing , Cheng Mingxi , Fang Shangshang
Published: May 2021

Due to the rapid promotion of electric vehicles, large-scale charging behavior of electric vehicles brings a large number of time and space highly random charging load, which will have a great impact on the safe operation of distribution network. This paper proposes a planning method of electric vehicle charging station based on travel data. Firstly, the didi trip data is processed and mined to get the trip matrix and other information. Then, the electric vehicle charging load forecasting model is established based on the established unit mileage power consumption model and charging model, and the charging demand distribution information is predicted by Monte Carlo method. Finally, the simulation analysis is carried out based on the trip data of some areas of a city, which shows the effectiveness of the established model feasibility.
Dynamic Modeling and Operation Characteristics Analysis of LiBr Absorption Heat Pump
Authors: Hu Xianfa , Zhang Shuqing , Peng Zhen , Tang Shaopu , Liu Ning
Published: May 2021

In order to fully exploit the dynamic operation characteristics of absorption heat pump, a dynamic simulation model of LiBr absorption heat pump considering mass transfer and distribution parameters is established. The thermal inertia characteristics of the system are studied, and the thermal performance and crystallization characteristics of the system are analyzed under the conditions of heat source temperature change, cooling water temperature change and refrigerant water temperature change. The results show that: the model can accurately simulate the steady-state and dynamic characteristics of the absorption heat pump; the thermal inertia of the unit is mainly related to the mass of the solution stored in the unit; the upper limit of the heat source inlet temperature is affected by the COP of the system and the crystallization risk, the decrease of the inlet temperature of cooling water can increase the COP of the system, and the lower limit is limited by the crystallization risk, and the cooling water inlet temperature is affected by the crystallization risk , and the lower limit of the inlet temperature of cooling water is limited by the crystallization characteristics. The upper limit of the inlet temperature of refrigerant water is not limited by the crystallization characteristics, but is mainly limited by the user’s energy demand. This provides a reference for the dynamic operation of absorption heat pump.
Study on time delay estimation in boiler acoustic temperature measurement based on third correlation PHAT-β
Authors: Wang Mianmian , Liu Wenhong , Xu Keni
Published: May 2021

In order to accurately measure the temperature of power plant boiler, a new algorithm of time delay was proposed based on third correlation and phase transform weighting on the basis of the research of traditional cross-correlation method and generalized cross-correlation. Small peaks can be weakened with the help of phase transform weighting and the addition of exponential coefficient β. The simulation result shows that the PHAT-β algorithm based on third correlation can accurately measure the value of time delay estimation compared with first correlation, second correlation and traditional third correlation, so as to improve the accurancy of temperature of power plant boiler.
Adaptability Study and Effect Evaluation of Work Damage Unplugging Technology
Authors: Liu Shasha , Fang Ping , Zhang Tiantian , Zhang Yunqi , Lei Pengfei , Liu Meng , Shang Fang , Wang Zhenfeng , Wang Kejia , Han Wenhua
Published: May 2021

In the process of oilfield development, the reservoir can be polluted by well cleaning, pump inspection and other operations. And that will lead to a long recovery period of oil well production after operation, and even the production is difficult to recover. In recent years, unplugging transformation and other technologies have been researched and applied, and certain results have been achieved. However, there is a lack of systematic evaluation and analysis on the applicability, advantages and disadvantages of various technologies. For this reason, the application effect of the existing technology is systematically analyzed and evaluated in terms of the formula of unplugging agent, unplugging process, damage mechanism, oil-water well relationship, production layer and other aspects by means of combination of geology and engineering. The adaptability of this technology is obtained, and it is used as the principle of well selection for subsequent technical application to further improve the effect of measures.
The Siting and Sizing Problem of Distributed Generation Based on a Novel Fractional Particle Swarm Optimization Algorithm
Authors: Zhang Fengming , Que Lingyan , Zhang Xinxin , Wang Fumian , Wang Bing
Published: May 2021

Large-scale distributed generation grid-connection brings huge economic and environmental benefits, but also threatens the stability of the grid. To make the grid consume a higher proportion of distributed generation, it is necessary to optimize the location and capacity of the distributed generation connected to the grid. Firstly, the uncertainty analysis model of wind speed, illumination intensity, and load of grid is established. Secondly, a distributed generation location and capacity planning model with the lowest annual comprehensive cost as the objective function is constructed. Then, a novel fractional particle swarm optimization algorithm is proposed, and the performance of the algorithm on complex optimization problems is tested. Finally, the simulation results of the IEEE 33-bus system example verify the rationality of the established model and the effectiveness of the proposed algorithm.
Research on two-stage allocation optimization technology of power grid operation and maintenance cost input considering asset scale status and efficiency fairness
Authors: Yu Na , Mei Shiyan , Chen Ming , Hou Kai , Chen Chao
Published: May 2021

The current complex internal and external situation puts forward higher requirements for the precise investment of funds for power grid companies. This paper proposes a two-stage operation and maintenance cost input optimization allocation technology based on comprehensive evaluation and Gini coefficient adjustment. This technology firstly identifies the influencing factors of operation and maintenance cost input, and combines the result of factor identification to construct an evaluation index system based on asset status and scale attributes. Through comprehensive evaluation and collection of index-related data, it determines the initial distribution coefficients and initial distribution coefficients of related enterprises based on the entropy weight method. Then combined with the principle of Gini coefficient, optimize the initial allocation plan to obtain the final investment allocation quota. This paper conducts empirical analysis with 10 companies as the research object, and the results show that the model can provide theoretical support and method reference for reasonable investment and reasonable decision-making of operation and maintenance costs of power grid companies under the requirements of precise investment management and control.
SPWM Smoothing Control Method Based on Wind Power Grid Connection
Authors: Fan Zixu , Tian Xingjun , Zhao Tong , Tan Zihang , Xu Chaozheng
Published: May 2021

Energy is the foundation of economic development and technological development. Facing the present situation of non-renewable energy decline, wind power generation has been developed rapidly. However, the problem of unstable output voltage of wind power generation due to unstable wind speed needs to be solved, and traditional solutions cannot make the generated electric energy meet the national standards for grid-connected and off-grid operation. In this paper, the electric energy generated by wind turbine is rectified by bridge rectifier circuit and using large capacity capacitor filtering to generate DC with flat waveform. Then, using SPWM inversion technology, the normal rotation wave with the same frequency as the power grid is used as the modulation wave and according to the required voltage amplitude, and the triangle wave with appropriate duty ratio is calculated by SPWM smoothing control theory as carrier wave. Subsequently, accurate filtering is carried out and grid-connected and off-grid operation is carried out through the self-aligning device. Finally, with the help of MATLAB simulation platform, the wind turbine is simulated to work under different wind conditions, and whether the generated electric energy meets the grid-connected and off-grid operation standards is judged, which further determines the reliability and authenticity of the theory.
Influence of C-rates on Consistency among Batteries in a Set in a Low-temperature Environment
Authors: Wang Hongwei , Ma Qiang , Gu Zhengjian , Zhu Yusong , Hu Bin , Fu Yanling , Tao Ziqiang
Published: May 2021

The methods of examining and evaluating the consistency among batteries in a set are mostly meant for the batteries in a conventional application environment. Therefore, this article has studied the influence of C-rates on the consistency among batteries in a set in a low-temperature environment, as well as the regular pattern of changes in charging and discharging currents, providing reference data for the correct use of batteries in a low-temperature environment, and establishing a research base for the improvement on the performance of batteries.
Research on Lightweight Technology of New Energy Vehicles
Authors: Fang Deng , Jinhua Wu , Yunfei Jiang , Yuanqing Zhang , Chuanyu Jiang
Published: May 2021

In this paper, the development status of lightweight technology of new energy vehicles is analyzed in detail, and the application of lightweight technology in the field of design and research of new energy vehicles is analyzed in depth, including the application of lightweight new technology and lightweight materials, and the specific problems arising from the application of lightweight technology in the field of new energy vehicles are analyzed. Then, the technical content and raw material demand of lightweight new energy vehicles are elaborated in detail, and the significance of lightweight new energy vehicles is analyzed. Finally, some feasible suggestions are put forward for the development of lightweight new energy vehicles.
Bimetallic sulfide based on various carbon materials for supercapacitors
Authors: Song YaoChen , Li Xinran , Wang Junchao , Wu Mengqiang , Liao Jiaxuan
Published: May 2021

The NiCo2S4/C hybrid material was successfully prepared by a simple one-step hydrothermal method. Carbon composite increases the specific surface area of the material and provides more ion attachment points during the electrochemical process. Conducive to the ion transportation and transfer, the composition of carbon material greatly improves the conductivity of the hybrid material. Electric double-layer capacitor materials can accept transferred ions faster than pseudocapacitor materials, enable the hybrid materials better adapt to intensity current changes. Compared with a single carbon material or a pseudocapacitance material, it has a higher specific capacity. This discovery is of great significance to the research of pseudocapacitive materials and supercapacitors.
Risk assessment of electricity price regulation for power grid enterprises based on system dynamics model
Authors: Zhao Huiru , Liu Sitong , Li Bingkang , You Peipei , Fang Rengcun , Guo Sen
Published: May 2021

The new round of power system reform has strengthened the supervision of transmission and distribution links, and changed the profit model of power grid enterprises by verifying the transmission and distribution price. In this context, the research on the regulatory risk faced by power grid enterprises under the electricity price regulatory policy can provide tools and decision support for power grid enterprises to accurately grasp the regulatory risk and reduce the risk loss. Firstly, combined with the transmission and distribution price supervision process faced by power grid enterprises, the possible risks faced by power grid enterprises in price supervision are analyzed. Secondly, the quantitative measurement model of electricity price regulation of power grid enterprises is constructed by using system dynamics, and the effectiveness of the model is verified. Finally, the future regulatory period is simulated and the results are analyzed, and policy recommendations are put forward.
Construction of E-government Data Sharing Framework Based on Big Data Technology
Authors: Qin Fang , Li Lin , Zeng Weijia , Wang Tao , Wang Can , Yu Linlin
Published: May 2021

With the continuous development of Internet technology, more and more fields are beginning to use Internet technology to improve their business construction. Moreover, in terms of e-government construction, introducing the Internet technology into e-government work at all levels is also an important content, and the Party Central Committee has proposed a series of major decisions such as network power and “Internet +” to accelerate the process of e-government informatization. Meanwhile, big data virtualization technology and access control technology are used to break through e-government data sharing barriers to realize virtual integration and trusted sharing across e-government data and support multi-departmental, crosslevel, and cross-network data security interactive processing for e-government business collaboration. Besides, the multi-source circulation and on-demand access of cross-departmental e-government data are realized to break data barriers, form data transmission links, and create a model for exchanging and sharing e-government data. Through the exchange and sharing of e-government data, the barrier-free flow of information can be achieved and the efficiency of e-government business handling can be improved as well.
Game Research on Property Right Evolution of Small Water Conservancy Projects under the Conflict of Multi-Stakeholders
Authors: Qu Shengteng , Zhang Yang
Published: May 2021

The property right of small water conservancy projects (hereinafter referred to as SWCP) currently can be defined as three different forms: public property rights, private property rights, and a combination of public and private property rights. The main participants are the government, farmers, and other organizations. The interests and demands of different subjects are different, so the property rights structure of the SWCPs are also different. In order to explore the evolutionary law of the property right structure of SWCPs in the case of conflicting demands of multiple stakeholders, a game model for the evolutionary law of each main body of SWCPs was proposed in this paper. By analyzing the feasibility of the game of multi-stakeholder appeal conflicts, a multi-stakeholder game model was established. The game and evolution of each stakeholder were analyzed, and the evolution of the property rights of SWCPs under the game of each subject was simulated and analyzed. The research results show that if the incentives and constraints of cooperation between farmers and cooperatives, associations and other organizations are greater than the cost of cooperation, farmers will participate in the cooperation and invest in elements actively, thus promoting the integration of elements, thereby contributing resource complementarity among participants and leaving more cooperation surplus. If the benefits of cooperation between the government and farmer organizations plus the total benefits of the incentive and restraint mechanism are greater than the total cost of active cooperation, furthermore, the incremental benefits of the incentive and restraint mechanism are not lower than the incremental costs of participating in the cooperative, then, farmer organizations are easier to get succeed. The research results have certain reference significance for the option of the property rights and management modes of SWCPs.
Analysis of College English Teaching Model Based on Network Automation Transformation
Authors: Bao Xiaoli
Published: May 2021

English education in colleges and universities has always been limited to the conventional teaching mode by multiple restrictions such as lecture system, teaching objectives and students’ quality for years. Based on the hot topic of automation transformation, this paper will analyze the problems faced by English teaching in colleges and universities from the perspective of the most popular Internet+ education, collect and organize relevant data, and then put forward relevant suggestions for the development of English teaching in colleges and universities, and put forward the prospect of its development in the future, with the aim of promoting the transformation of college English teaching mode in order to improve the teaching quality of English classroom.
Research on Construction and Evaluation Method of Comprehensive Evaluation Index System for Investment Benefit of Distribution Network
Authors: Li Ying , Zhang Xueying , Zhang Yue , Lai Laiyuan , Chen Chao
Published: May 2021

Under the new situation, the improvement of investment efficiency and efficiency will be the basic criteria for evaluating the quality of power supply enterprises’ investment activities in the distribution network. To this end, based on the characteristics of distribution network construction, combined with the internal and external development trends of power supply enterprises and development and promotion needs, this paper constructs a scientific comprehensive evaluation index system and evaluation method for the investment benefits of distribution networks, which is useful for scientifically grasping the investment needs and investment capabilities of power supply enterprises. It is of great significance to achieve a more precise and lean level of investment in the distribution network.
Research on Comprehensive Evaluation of Military Aircrafts’ Overhaul Performance Based on Entropy Weight and Cloud Model
Authors: Lei Zhang , Yachao Jing
Published: May 2021

Due to the complex evaluation of the current military aircrafts’ overhaul performance with many influencing factors, an evaluation index system of military aircrafts’ overhaul performance was constructed. It was proposed that the entropy weight method (EWM) was used to calculate the performance results, and then the performance of the reliability and validity of the results was verified based on the cloud model. By collecting the performance index data of a certain type of military aircraft overhaul from 2015 to 2018, the value of the overhaul performance of this type of military aircraft was calculated, and the feasibility and effectiveness of the method were verified.
The Pay Dispersion within Top Managers and Corporate Environmental Responsibility Information Disclosure
Authors: Gan Shengdao , Mo Wenyu
Published: May 2021

Because of the large scale of listed companies, they are often the main responsible parties for environmental problems. Therefore, from the perspective of compensation incentive, this study made an empirical test on how the pay dispersion within top managers affects corporate environmental responsibility information disclosure. By selecting A-share companies listed in Shanghai or Shenzhen Stock Exchange which published corporate social responsibility reports from 2008 to 2018 as research samples, a multivariate regression analysis model was established. The results showed that there is a significant inverted U-shaped relationship between executive compensation gap and corporate environmental responsibility information disclosure. Further research found that this relationship was only significant in state-owned enterprises.
Forecast of the trend of heavy fog based on the VARIMAX model
Authors: Peng Boyang , Meng Yuchi , Shi Dapai , Dai Mingyu , Zhou Hao , Chen Tingxuan
Published: May 2021

This paper works out relationship between visibility and near-surface meteorological factors. The formation of heavy fog is affected by meteorological factors near the ground and fog in the past period. In this paper, we abstract and simplify the problem as a time series problem. First, the airport AWOS observation data is reprocessed, and some missing and incorrect data are supplemented and corrected. Then draw a distribution map of “Visibility-Near-surface Meteorological Factors” to intuitively grasp the correlation between them. Finally, model the classic VARIMAX to fit the mapping relationship between visibility and near-surface meteorological factors. The results show temperature has the greatest impact on visibility index, positively correlated with it; secondly, dew point temperature index negatively correlated with it. The results show that, with the temperature low and the humidity high, the water vapor in the atmosphere is more likely to condense into mist, which is not easy to dissipate, resulting in reduced visibility. The indicators related to air pressure and wind speed are positively correlated with visibility, indicating that the increase in air pressure and the increase in wind speed will promote the dissipation of heavy fog. Generally speaking, the MOR index fits better with near-surface meteorological factors.
Research Progress on Growth Characteristics of Invasive Plants in Different Habitats
Authors: Wang Zhe , Yue Ruirui , Li Yang
Published: May 2021

Biological invasion generates serious threats to global biodiversity. Exotic species usually have high environmental adaptability and tolerance, which is one of the bases of their invasion. Except for biological invasion threats, other serious environmental problems like extreme cold or hot events, soil drought, saline-alkali and flood are emerging constantly on a global scale. In the background of multiple environmental problems interfering with existing habitats, exploring the growth characteristics of invasive plants in different habitats, and grasping the reasons why the invasive plants can obtain growth superiorities are in favor of propelling the understanding of their invasion mechanism. This paper gives an overview of research progress on the invasive plants’ morphological characteristics and physiological characteristics in deferent habitats, summarizes the growth specialties of invasive plants which are affected by high temperature, low temperature, drought and flood, and discusses the reasons why the invasive plants prevail in the growth competitions, which provided theoretical and realistic signification to relieve the biological invasion current status.
Experimental Study on the Temporal and Spatial Variation Law of Gas Flow in Different Rock Pillar Drainage Boreholes
Authors: Wang Zhonghua
Published: May 2021

In order to study the temporal and spatial variation of gas flow in different rock pillar extraction boreholes, gas pressure, gas content, gas emission from 100-meter coal holes and coal seam permeability coefficient were measured on site. The site inspected the gas flow in the boreholes at 15m, 7.5m, directly above, 7.5m, and 15m at the lower slab of different rock pillar floor roadways. It analyzed the change law of gas flow in boreholes of 710 floor lanes and 505 floor lanes, which provided a basis for the layout of gas drainage boreholes.
Research on Equalization of Public Transportation Services Based on Perspective of Groups – A Case Study of Beijing
Authors: Liu Ruijiao , Tong Qiong , Tian Jin
Published: May 2021

In this paper, by quantifying the value of public transportation travel benefits of ordinary travel groups, economically disadvantaged groups, and physiologically disadvantaged groups, this paper establishes a public transportation travel benefit evaluation index system, uses a questionnaire survey method to collect index data within Beijing, and establishes a TOPSIS model. Based on the travel benefit values of the three groups, the benefit compensation for disadvantaged traffic groups is considered, benefit compensation factors are introduced, the degree of equalization is evaluated based on the Wilson entropy model, and the level of equalization among public transportation service groups in Beijing is empirically studied to find out an important indicator that restricts the level of equalization.
Study on Dynamic Multi-objective Emergency Decision -making Model of Social Emergency
Authors: Li Hongyan , Zhu Daoping
Published: May 2021

According to the characteristics of emergencies, a dynamic multi-objective emergency decisionmaking model is proposed. By introducing triangular fuzzy Numbers to calculate the correlation distance between the selected solution, the ideal solution and the negative ideal solution, considering the correlation degree between solutions, the correlation between indexes is highlighted. In addition, the paper strengthens the processing of fuzzy and uncertain information in the real world through the comprehensive integrated fuzzy theory, which is closer to the practical application. Finally, the paper combines the example of emergency decision making of African swine fever accident, and found that the method is relatively scientific through the simulation calculation by the expert group from the invited school.
Application of SWOT-CLPV Model in China’s Hierarchical Medical Mode
Authors: Yang Xingyu , Shan Tianlong , Sun Peiyuan
Published: May 2021

Medical service system is a complex system composed of different interest related factors. The core of hierarchical medical mode is to deal with different levels and types of medical institutions to ensure the coordinated operation. In view of the reform of medical and health system, combined with the current situation of China’s medical system, this paper constructs the SWOT-CLPV model of hierarchical medical in China, sorts out the advantages, disadvantages, opportunities and threats of the hierarchical medical mode in China, further explores its inhibition, problem, leverage effect and vulnerability, and studies the development strategy of hierarchical medical.
Supply Chain Scheduling Using Double Deep Time-Series Differential Neural Network
Authors: Lu Wei , Tan Hua , Yan Xiaohui , Lv Cixing
Published: May 2021

The purpose of supply chain scheduling is to be able to find an optimized plan and strategy so as to optimize the benefits of the entire supply chain. This paper proposes a method for processing tightly coordinated supply chain task scheduling problems based on an improved Double Deep Timing Differential Neural Network (DDTDN) algorithm. The Semi-Markov Decision Process (SMDP) modeling of the state characteristics and action characteristics of the supply chain scheduling problem is realized, so as to transform the task scheduling problem of the tightly coordinated supply chain into a multi-stage decision problem. The deep neural network model can help fit the state value function, and the unique reinforcement learning online evaluation mechanism can realize the selection of the best action strategy combination, and optimize it under the condition of only the stator processing time. Finally, the optimal action strategy group is obtained.
Construction of ring monitoring network for river and lake environmental monitoring system
Authors: Li Yijie
Published: May 2021

With the continuous improvement of the level of science and technology in China, people’s desire for green water and blue sky is becoming more and more intense. Water pollution, air pollution, soil pollution and other issues always affect the lives of residents. Environmental detection is the basic work of environmental protection. In this paper, based on the problems of environmental monitoring of rivers and lakes, we set up a ring network for environmental monitoring of rivers and lakes. The system is mainly composed of sensor nodes and monitoring center to monitor the main indicators of river and lake environment. In order to ensure people’s high requirements and high standards for the environment. To realize the complete monitoring of rivers and lakes.
A Study on the Theoretical Model of Port Safety Resilience under Major Emergencies and Its Quantitative Evaluation
Authors: Hu Yanhua , Meng Guodong , Lv Jianyu , Jin Hang , Lu Linlin
Published: May 2021

With the rapid development of urbanization, China’s security system in ports is facing many problems and challenges, especially after the outbreak of COVID-19 has made a great impact on China. In order to avoid the serious losses caused by safety problems in ports under major emergencies due to the lack of necessary, forward-looking prevention in the increasingly complex system of ports, this paper introduced the theory of safety resilience into the field of ports for the first time and proposed a triangle model of safety resilience in ports, which included three elements: the disaster system, the disaster bearing system and the safety resilience management. Aiming at the quantitative evaluation demands of safety resilience in ports, the system evaluation indexes of safety resilience in ports were established, including 6 secondary indexes and 37 tertiary indexes. The theory of entropy weight based on normalization standard processing was used to calculate and analyze the importance of each index, and the influence weight value of each index on safety resilience and the prediction curve chart of safety resilience in ports were obtained. The research results can provide a reference for the capacity construction and application of safety resilience in ports, which will effectively solve the new challenges faced by port safety at this stage and help to improve the ability of the port not only in disaster prevention and mitigation but also in disaster recovery and continuous improvement.
Establishment and application of soil hydraulic erosion model based on GIS and USLE model
Authors: Guo Ke-xin , Cao Ying-xian
Published: May 2021

Soil erosion is the most common form of soil degradation, which is the main problem of soil environmental destruction worldwide. Based on the USLE and GIS remote sensing inversion and superposition analysis technology, this study simulated and calculated soil hydraulic erosion in Fangshan World Geological Park, China in 2011, 2012 and 2013, analyzed its spatial-temporal dynamic changes, and explored the key points of soil erosion control in the study area. The results show that (1) The main erosion occurred at 25°-35° steep slope and 400-800m height, which accounted for more than 30% of the total soil erosion in all the three years. (2) The average erosion modulus and erosion amount in 2012 were significant higher than that in 2011 and 2013 at each slope grade, shown that the soil erosion of 2012 is influenced by natural disaster.With the increase of slope grade, the average modulus also increased.
Research on the Evolution Path of Public Opinion in Environmental Emergencies
Authors: Tan Kaixi , Xie Lixun , Lin Lifa
Published: May 2021

In recent years, environmental emergencies have spread rapidly on the social media, causing public concern. This study takes the “3.21” accident in Xiangshui, Jiangsu as an example, and obtains 46, 265 Weibo comments by using Python program. After data preprocessing, 7740 Weibo comments were obtained. The evolution stage of public opinion about accidents is divided into outbreak period, temporary decline period, recurrence period and recession period by using the changing characteristics of public attention. This study uses the sentiment analysis model and LDA theme extraction model to analyze the emotional analysis and theme extraction of comments in each stage, analyze the emotional tendencies and Theme Evolution in each stage, and analyze the evolution law of public opinion in the “3.21” accident in Xiangshui, Jiangsu. Studies show that public attention decreases rapidly from the outbreak stage to the temporary decline stage, increases slightly in the recurrence stage, and lowest in the recession stage. Public sentiment is susceptible to derivative events throughout the evolution of public opinion. If the derivative events are encouraging events such as rescue and rescue, the proportion of public positive emotions will increase. If the derivative events are negative events such as corruption, the proportion of public negative emotions will increase. The research conclusion provides theoretical support for establishing public opinion response mechanism to environmental emergencies.
Safety Evaluation of Quayside Container Crane based on Stress Test
Authors: Qiu Jun , Huang Zheng-qiu , Ren Li-xin , Tong Yao-ting
Published: May 2021

Due to the long service life of a quayside container crane in an enterprise, there is slight corrosion on the surface of metal structure, which has potential safety hazard. In order to master the technical condition of the metal structure of the crane, the stress distribution and change information of the crane are obtained by dynamic and static stress testing and non-destructive testing. According to the analysis and test results, the safety assessment of the whole machine is completed and reasonable management suggestions are put forward.
Study on Synergistic Mechanism of Water Environment Governance in Dongting Lake Basin Based on Evolutionary Game
Authors: Chai Mao , Deng Yalan , Sohail Muhammad Tayyab
Published: May 2021

Watershed water environment governance has always been a research hotspot in the field of transboundary governance. Based on evolutionary game theory, the regional governments of East Dongting Lake, West Dongting Lake and South Dongting Lake were taken as participants to construct a tripartite game model, and the game evolution strategies under unconstrained and constrained conditions were explored respectively, so as to analyze the influencing factors of the construction of synergistic mechanism of water environment governance in Dongting Lake Basin. The results show that: (1) Under the unconstrained condition, the stable strategy of the evolutionary game is “two parties govern, one party does not govern”. However, without intervention of external restraint measures for a long time, the players keep learning and improving according to the game results, and the final synergy mechanism cannot be achieved. (2) Under constraint conditions, the composition of synergistic mechanism mainly depends on the size of ecological compensation and punishment given by the superior government and the duration of constraint by the superior government.
Numerical Simulation Analysis Based on the Study of the Slag discharge Mechanism of the Triangular-shaped Drill Pipe
Authors: Tang Dayong , Tang Yi , Duan Zhengyong , Lei Wannian , He Xiaolong , Zhang Fubing
Published: May 2021

According to the characteristics of high efficiency and high hole forming rate of the triangular-shaped drill pipe in the process of drilling in soft outburst coal seam, the slag discharge model of annular gap between the triangular-shaped drill pipe and hole wall is established by using the basic theory of computational fluid dynamics.Using the finite volume element method, the flow field characteristics of the annular flow area between drill pipe and hole wall are analyzed.Through the numerical simulation analysis, the velocity fluctuation effect of the annular flow field of the slag removal model is put forward, that is, the velocity fluctuation zone is formed between the sides of the arc edge of the triangular-shaped drill pipe, which causes the precipitated coal cinder to rise under the vortex action of the flow field, and is quickly discharged out of the hole under the coordination of the axial velocity, which effectively improves the slag removal efficiency and pore forming rate of the drill pipe.Finally, the comparative test of the triangular-shaped drill pipe and wide-blade spiral drill pipe was carried out in the soft outburst coal seam of 31021 lower auxiliary roadway in a mine. The drilling depth was increased by 19.4%, the hole forming rate was increased by 17.4%, and the drilling efficiency was increased by 26.4%. There was no drill drop and broken phenomenon.
Influence of different air supply parameters on indoor thermal comfort of upper air supply room
Authors: Wang Yan , Qu Zhuangzhuang
Published: May 2021

With the help of Airpak software, the evaluation indexes of temperature field, velocity field and PMV under different air supply parameters are explored. Through the analysis of different parameters of the air supply field, such as temperature and PMV, the evaluation index of the optimal air supply field was established. By comparing the differences of indoor flow field distribution under five different working conditions, the optimal air supply parameters are obtained, that is, when the air supply temperature is 23 °C and the air supply speed is 3.3 m / s, the indoor temperature field and velocity field distribution are the best. The simulation results provide a theoretical basis for the setting of air supply parameters in the upper air supply room.
Long-term Trends of Volatile Organic Compounds over the Texas, USA in the Past Two Decades
Authors: Liu Ruizhe
Published: May 2021

Volatile organic compounds (VOCs) are organic compounds in the air that have low vapor pressure. VOCs can be emitted from a variety of sources including biogenic, anthropogenic and pyrogenic processes. VOCs are precursors of aerosols and tropospheric 03. which harm human health. However, the potential of VOCs forming secondary air pollutants varies by species. Here, we analyze the long-term trends of soiu'ce. concentration and reactivity of six classes of VOCs from 1995 to 2018 over Texas. USA. VOCs emission from petroleum and related companies in Texas kept increasing these years. Among the VOCs tracers of oil and gas companies, the concentration of ethane kept increasing until 2015. Despite the increase of oil and gas related VOCs. the concentration of total VOCs and reactivity-weighted VOCs have decreased in the past two decades. We further investigate the seasonality of VOC reactivities, which depend on both temperature and VOC concentration. We find that VOC reactivity generally is highest in fall and lowest in spring, and such seasonality does not change over the two decades.
Technologies Protecting the Environment in Urban Areas
Authors: Kostadinov Kostadin , Filipov Stoyan , Chipilski Radoslav , Shopova Nadezhda
Published: May 2021

Global warming is the leading cause of the extreme meteorological events increase in the last three decades. Increase of annual average air temperature and temperature values during winter and early spring has been recorded in comparison to the (1961-1990) referent period in Plovdiv region. The lettuce development was researched in a greenhouse in the Agricultural University- Plovdiv. During the lettuce growth six different variants were used: no fertilizer, one chemical, and four organic fertilizers. The effect of the different organic fertilizers was studied through specific physiological parameters and productivity. This paper analyzed changes in functional activity of the plant photosynthetic apparatus and productivity of variants with different fertilizers in an unheated greenhouse. The ratio between photosynthetic active radiation (PAR) and quantum yield (qY-Fv/Fm) of PS II was determined to be more optimal in dark-adapted leaves for the organic fertilizer variants, compared to the no fertilizer variant. The lower and significant difference was observed in the values of the minimal fluorescence Fo in reaction centers of PS II after the dark-adaptation of leaves for organic fertilizer variants compared to the no fertilizer variant. Higher values of chlorophyll content index (CCI) were estimated for organic and chemical fertilizers compared to the no fertilizer variant. All variants fertilized with organic and biofertilizers comply with the quality standard from the beginning to the end of harvesting.
Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO2 Hydrogenation at Low Pressure
Authors: Abelniece Zane , Kampars Valdis , Piirsoo Helle-Mai , Tamm Aile
Published: May 2021

CuO on mesoporous silica catalyst was prepared with post synthesis impregnation method, and the effects of Al and Co promoters on CuO/SBA-15/kaolinite catalyst properties and CO2 hydrogenation were studied. The mixing technology with kaolinite clay (containing Al2O3) was used to obtain the granules and to enhance the CO2 conversion to methanol as a product. The performance of all catalysts for catalytic hydrogenation of CO2 was evaluated on a fixed-bed tubular micro-activity reactor at 20 bar and 250°C with H2/CO2 molar ratio 3:1. XRD analysis, N2 adsorption-desorption analysis and SEM-EDX analysis indicated that the mesoporous structure of SBA-15 remains after loading with CuO and promoters, and after mixing with kaolinite clay. Results were compared with results obtained with commercial CuO/Al2O3 catalyst, which showed high MeOH selectivity (78%) during CO2 hydrogenation reaction.
Eco-educational Potential of the Urban Environment
Authors: Stoyanova-Toneva Yordanka
Published: May 2021

The formation of ecological culture is one of the challenges in the educational process, fully in line with the new initiatives of the European Network for politics in the field of key competences (KeyCoNet). Ecological education presupposes direct contact with nature and the everyday urban environment and becomes a necessary element of modern curricula. The inclusion of adolescents in various activities of an ecological nature fits into the leading ecological paradigms of our time. Along with the traditional school environment, the various urban spaces are becoming a natural learning platform, offering non-traditional educational approaches for teaching outside the classroom and the formation of knowledge and skills in modern ecological and social infrastructure.