bluuebunny/crossref_metadata_2025 huggingface dataset:
Debris flow gully zoning and risk assessment based on numerical simulation
Authors: Feng Zhen , Chen Liang , Tian Yifan , Liu Mingxue , Wang Lichao
Published: June 2023

In order to evaluate the zoning and risk of debris flow gully based on numerical simulation, a set of theoretical system and technical process of debris flow quantitative risk analysis suitable for mountainous towns in southwest China was constructed, taking buildings and roads as the research objects, in view of the particularity of disaster-bearing body types and debris flow disaster modes. It is mainly divided into three steps: (1) Using FLO-2D numerical model, the risk of debris flow is expressed by intensity index IDF; The simulation results of debris flow in Gully A 7·11 show that the area of correctly judged area is 50.02×104m2, the comprehensive accuracy index ω is 1.22, and the maximum IDF can reach 1013.25m3/s2, showing a general trend that the upstream is higher than the downstream, and the center of the drainage channel is higher than both sides. Using the data of debris flow damage in A ditch 7·11 in A city, a material vulnerability curve based on the probability of exceeding loss is constructed. Based on the establishment of disaster-bearing body database, the expected loss of disaster-bearing body can be expressed quantitatively by setting different future debris flow scenarios. The model verification and case application of A ditch in A city show that the quantitative risk analysis system of debris flow can well reflect the response mechanism of disaster-bearing body and debris flow, and can provide scientific basis for disaster prevention and mitigation in debris flow threat areas.
Performance Evaluation of Urban Water Environment Management Projects for the Protection of the Yangtze River Based on AHP-Fuzzy Comprehensive Evaluation Method
Authors: Rufa Tao , Xinyue Han , Wenran Chen , Huihuang Luo , Pingyu Lv
Published: June 2023

In order to promote the urban water environment management work for the protection of the Yangtze River, it is necessary to use a scientific evaluation index system to evaluate the governance effectiveness of completed management projects in pilot cities. Based on the characteristics of urban water environment management projects, this paper uses a constructed evaluation index system for the effectiveness of urban water environment management projects in the protection of the Yangtze River to evaluate the effectiveness of Phase I urban water environment management projects in Jiujiang City. The weights of each criterion layer and indicator layer were determined using the Analytic Hierarchy Process, and the fuzzy comprehensive evaluation method was used for comprehensive evaluation. The conclusions are as follows: (1) the engineering efficiency evaluation result is poor, mainly affected by the urban rain and sewage pipe network engineering criterion layer, in which the weight of the BOD5 concentration of domestic sewage in the influent of the sewage treatment plant is relatively large, and the membership degree result is poor, so attention should be paid to the BOD5 concentration of the sewage treatment plant within the scope of the project. (2) the engineering benefit evaluation result is generally good, and this evaluation result can reflect the overall benefits of the Phase I urban water environment comprehensive management project to the "plant-network-river-lake-shore" within the scope of Jiujiang City, but it is only reflected significantly by the surface water improvement contribution criterion. The reflection of social and economic aspects is not obvious, and follow-up research needs to increase the participation of residents through questionnaires or field surveys to make the results more reflective of the economic and social benefits.
Late-Holocene fire regimes under climate and vegetation change in the Sanjiang plain, northeastern China
Authors: Yin Rui
Published: June 2023

Understanding historical fire regimes and their driving mechanisms provides valuable insights for future hazard prediction. Here, we reconstructed the fire and vegetation histories of the Sanjiang Plain over the last 5000 years based on microscopic (<125) charcoal content and morphology of sedimentary coring in the coastal marshes of the middle reaches of the Ussuri River, respectively. The results of the study indicate that four high fire frequency phases were identified in the last 5000 years, at 4.3-4.0 ka BP, 2.8-2. ka BP, 1.4-1.2 ka BP, and 0.5 ka BP to date. These intervals coincide with the weakening phase of the East Asian summer monsoon (EASM) during the late Holocene and are generally consistent with the decreasing trend of precipitation in the region. Thus, we suggest that the EASM circulation, and especially its accompanying precipitation, played a key role in the evolution of fire regimes in the Sanjiang Plain during the Late Holocene. In addition to climate change, regional vegetation conditions are also significant factors driving fire occurrence. In contrast, the gradual increase in fire frequency over the last 500 years has been caused mainly by human activities rather than climate and vegetation.
Research on the Development Trend of Environmental Water Treatment Industry
Authors: Zhang Qi
Published: June 2023

With the development of the times, China's demand for water resources is growing, but with the development of all walks of life, water resources have been seriously polluted, which has a certain impact on people's quality of life, will affect people's health. In order to improve this situation, it is necessary to treat water resources and complete environmental protection work. This paper first introduces the water treatment technology of environmental protection industry, introduces the working principle of water treatment technology, and studies the future development trend of environmental protection water treatment industry.
Hazard Assessment of Urban Waterlogging Disaster on Underground Substations in Shanghai
Authors: Xiao Rong , Mao Weiyun , Lu Bingbing , Yang Hanwei , Chen Lu
Published: June 2023

Based on the two methods of the index system and the scenario simulation, hazard assessment of urban waterlogging disaster on underground substations in Shanghai was carried out. The results show that: (1) the return period rainfall of underground substations in Shanghai gradually increases with the extension of the return period; in terms of spatial distribution, the return period precipitation of the stations along the river and within the inner ring is higher than that of the stations outside the inner ring. (2) The waterlogging thresholds of stations between the inner ring and the middle ring are highest. The waterlogging thresholds of stations within the inner ring and between the middle ring and the outer ring are higher than those in the suburban stations. (3) Under the 20-year return period extreme precipitation scenario, the urban waterlogging risks of underground substations in Shanghai are mainly at low and medium levels. Under the 50-year and longer return period extreme precipitation scenario, the risks of inner ring stations increase to medium-high level.
Analysis on the Development of LNG Clean Energy Technology for Inland Ships in China
Authors: Li Kun , Li Xiang
Published: June 2023

Liquefied natural gas (LNG) is recognized as the most mature and feasible low-carbon clean alternative energy for ships in the world. Liquefied natural gas is widely favored by ship owners. This paper systematically summarizes the development status of promoting the application of LNG in ships at home and abroad. This paper deeply studies the key technologies of ship LNG power system, and focuses on the comparison of the characteristics of power technology at home and abroad. This paper comprehensively summarizes and analyzes the supporting system for the development of LNG powered ships in China. This paper explores the problems existing in the application of LNG in ships. The paper puts forward a power development path of LNG ships in China in the future. The proposed development path can provide strong support for China to achieve green shipping and dual carbon goals.
Investigation and assessment of soil contaminated by organophosphorus pesticides using spot setting method
Authors: Xiao Jipan , Diao Chunyan , Jin Zhibo , Li Jianfeng
Published: June 2023

The contaminated soil caused by an organophosphorus pesticide production enterprise was evaluated, in order to provide constructive suggestions for the future remediation work. This study follows the basic technical route of sampling with the method of distribution, and combined with the relevant national laws and regulations and the actual situation of the site to evaluate and analyze, and finally find out whether the characteristic pollutants of the contaminated site exceed the standard and the environmental health risk. The results show that in the selected contaminated sites, the method can be implemented and obtained clear analysis results. The characteristic pollutants such as benzene, ethiophosphorus and parathion are far beyond the national standards, and seriously endanger the life and health of the surrounding residents. Conclusions:1) In the assessment of some contaminated sites, especially those contaminated by organophosphorus pesticides, the sampling method has the advantages of uniform, extensive, accurate and low sampling cost;2) The pollutants related to the polluted site, especially the volatile organic compounds such as benzene and parathion, are much higher than the limit value, and the peculiar smell is obvious, which seriously endangers the life and health of surrounding residents, causing the attention of relevant departments and providing guiding opinions for the future restoration work. In the future, the pollutants in the polluted site will be effectively removed through the restoration work. To ensure the life and health of neighboring residents, and promote China's ecological civilization construction.
Developing a vine copula model to simulate and predict long serial lake water levels
Authors: Gu Shixiang , Wei Yanling , Chen Jing , Zhao Zhong , Gao Rong , Chen Jinming , Gao Zekun , He Mengqi , Chen Gang , Li Jing
Published: June 2023

Lake water level changes show randomness and the complexity of basin hydrological simulation and lake water level response. We constructed a vine copula model to simulate and predict lake water level that incorporated rolling decisions and real-time correction of prediction results. The model was applied to predict the long- and short-term water levels in Erhai Lake on the Yun-gui Plateau, southwest China. The results showed that (1) the predicted daily water levels (with ME=0.02~0.09, RMSE=0.02~0.024, NSE=0.99, and IA=0.99) were more accurate than the predicted monthly water levels (with the ME=0.039~0.444, RMSE=0.194~0.279, NSE=0.913~0.958, and IA=0.977~0.989), and the accuracy of the predictions improved as the number of variables increased. (2) The vine copula model outperformed the back-propagation neural network and support vector regression models, and, of the three model types, gave the best estimate of the nonlinear relationships between the predicted water level and climatic factors, especially in the wet season (May to October). (3) The prediction accuracy of the vine copula model was lower for small sample sizes and when there was a lack of runoff data. By improving the analysis of the model’s errors, the percentages of the relative errors of the prediction accuracy less than 5%, 10%, 15%, and 20% increased to 70%, 83%, 95%, and 98%, respectively.
Study on the green decontamination method of riot dyeing agent rhodamine B
Authors: Chen Yali , Gan Yuping
Published: June 2023

The riot dyeing agent Rhodamine B is a dyeing agent loaded in riot ammunition, which can produce serious environmental pollution after use. In order to eliminate the environmental pollution of rhodamine B, a decontamination method with simple operation, wide material sources and green environment protection was studied. First, an orthogonal experiment was used to obtain a concentration ratio of decontaminant with excellent performance, that is, the best decontamination effect of rhodamine B when the concentration of hydrogen peroxide was 15%, the concentration of boric acid was 3.5% and the concentration of ferrous sulfate heptahydrate was 0.4%. Then, the actual decontamination effect of the formulated decontaminants on rhodamine B was examined by test tube decontamination method and immersion decontamination method. The results of the decontamination experiments showed that the decontaminants formulated according to the optimal results of the orthogonal experiments had significant decontamination effects on both the rhodamine B powder and the non-woven masks contaminated with rhodamine B. This decontamination method has good application value and can be used for the decontamination of riot dyeing ammunition contaminated sites and clothes to eliminate the environmental hazards of dyeing agent rhodamine B.
Ecological Service Function Evaluation and Sustainable Development Countermeasures of Plateau Wetland Ecosystem: A Case Study in Lashihai Nature Reserve, PRC
Authors: Cai Mengmeng , Dong Zehao , Chen Zejin , Zhao Zheng
Published: June 2023

The Nature Reserve plays a very important ecological role in many ways, such as soil-water conservation, flood-drought prevention, and water balance. Thus, protecting and maintaining the wetland and other crucial components of Lashihai Nature Reserve are of great importance not only to the natural environment and biodiversity conservation, but also to the development of regional economic as well as social stability. Based on the characteristics of plateau wetland of Lashihai Nature Reserve in Lijiang City, Yunnan Province, this study tried to establish an evaluation system. It is mainly aimed at evaluating the direct and indirect use value of the ecosystem service value of this vary wetland reserve. The results showed that: the total annual ecosystem service value of Lashihai Nature Reserve is 198.44 million yuan. Among all kinds of values, the climate regulation value ranks first with 79.35 million yuanꞏa-1, accounting for 39.99% of the totality, then followed by the tourism value and resources value, while the water purification value comes the last with 0.48 million yuanꞏa-1.
Research progress of agricultural runoff pollution and its ecological treatment technologies
Authors: Zhu Shu-Xian , Zhang Yu-Liang , Xu Bing-Jiao , Zhang Zhao-Yu , Xia Yin-Feng
Published: June 2023

With the rapid development of China's social economy and the rise of agricultural industrialization, the problem of agricultural non-point source pollution is becoming increasingly prominent. Reducing nitrogen and phosphorus nutrients in agricultural runoff is the key to control agricultural non-point source pollution, and it is also a hot research topic at home and abroad. The traditional methods to remove nitrogen and phosphorus nutrients in agricultural runoff mainly include ecological ditch, ecological buffer zone, and constructed wetland, etc. At present, ecological ditch, ecological buffer zone and constructed wetland are widely used in the treatment of agricultural runoff, while Microbial Fuel Cell (MFC) technology and biofilm-electrode reactor (BER) have gained wide attention in recent years, it is the key technology of agricultural runoff treatment and has been widely recognized in the world. The purpose of this text is to explore the mechanism and technology of nutrient removal from farmland wastewater by in-situ biological treatment.
Research Trends and Perplexity of Green Manufacturing Under the Goal of “Carbon Peaking and Carbon Neutrality”--Based on Citespace & Coupling Model
Authors: Ding Yingnan , Meng Qingjun
Published: June 2023

In this paper, the reference theses are from CNKI and core database of WOS. A total of 503 theses published from 2016 to 2023 about this topic in China and abroad are collected. Citespace is mainly used to compare and analyze the number of published theses, authors, institutions and hotspots in this field at home and abroad. Then coupling model is used to study the coordination degree between the hottest topic of the moment and the development of domestic green manufacturing. The results show that: (1) In the past 7 years, the attention on the development of green manufacturing has been rising rapidly; (2) The cooperation between domestic scholars and institutions is not optimistic; (3) China takes the lead in the number of international publications, which reflects the high importance China attaches to the development of green manufacturing. (4) Nowadays, countries all over the world generally pay attention to the application of R&D investment and technological upgrades in the field of green manufacturing; (5) At present, there is a risk of imbalance between R&D investment and green manufacturing development in China.
A Review of Research on Low-Carbon Customization
Authors: Zhao Xiaohan
Published: June 2023

In recent years, environmental protection has become the consensus of people all over the world, and the implementation of low-carbon economic model is the inevitable choice of global economic development. Consumption is an important link in economic development. How to enhance residents' willingness to low-carbon consumption has become a hot topic, and low-carbon customization has been gradually derived. Different from traditional low-carbon consumption, low-carbon customization is a complex consumption pattern. Therefore, it is necessary to review the existing research results and grasp its research status. In this paper, the existing research literature on low-carbon consumption and low-carbon customization is systematically reviewed. First of all, the concept and connotation of low-carbon consumption are improved, and various influencing factors (including demographic factors, psychological factors and external factors) of low-carbon consumption are summarized. Then the concept of low-carbon customization is further clarified, and the important influence of the choice architecture in the customization process is emphasized. Finally, this paper analyses the limitations of the current research and proposes the possibility of future research, hoping to contribute to the existing research on low-carbon consumption.
Analysis on the relationships between dust retention amount and leaf stomata traits of five evergreen plants
Authors: Tao Jin-Jing , Jia Yue-Yu , He Meng-Xuan , Yao Wen-Shuang , Pu Yu-Ting , Mo Xun-Qiang
Published: June 2023

Air pollution in Beijing-Tianjin-Hebei region has caused widespread concern. In winter, the combustion of fossil fuel produces a very high proportion of fine particulate matter in the air. However, the vegetation coverage is relatively low. The dust retention of evergreen plants is particularly important for improving air quality. In this study, five evergreen species were selected, and the effects of leaf stomatal characteristics (stomatal width, stomatal length and stomatal density) of greening plants in winter on leaf dust retention were explored. The results showed that: (1) The highest percentage of PM10, PM2.5, and PM1 were retained by Yucca gloriosa, followed by Buxus sinica and Phyllostachys propinqua (2) There was a positive correlation between stomatal density, stomatal width and TSTP, while the correlation between stomatal length and TSTP was low. Our study can provide scientific guidance for plant planning to improve urban air pollution.
The Heavy Metals Transformation During The Pyrolysis And Hydrothermal Carbonation of Municipal Sewage Sludge
Authors: Pan Ruixin
Published: June 2023

The eco-risk of heavy metal has been a constraint to the resource utilization of sludge and sludge biochar, which depends mainly on its chemical form. In recent years, the researches on the speciation and distribution of the heavy metals in sludge and its biochar have received extensive attention and have become a research hotspot in environmental science. In this paper, the technical characteristics of pyrolysis and hydrothermal carbonation (HTC) are discussed. Secondly, the contents and speciations of heavy metals in municipal sewage sludge and biochar were analyzed. Finally, the reaction mechanisms of heavy metals during pyrolysis and HTC were summarized. This paper comprehensively compares the differences in the form transformation of heavy metals in these two processes, which offer an important references for further researches on the immobilization of heavy metals in pyrolysis and HTC.
Study of maleic anhydride based water treatment agents
Authors: Liu Zhan , Yan Mei-fang , Li Na , Gao Yu-hua , Li Hai-hua , Liu Zhenfa
Published: June 2023

The research results of maleic anhydride water treatment agents in the past years were summarized and analyzed, which provided reference for further research and preparation of environmental protection water treatment agents. A binary copolymer product with excellent scale inhibition and dispersion properties was synthesised using maleic anhydride and sodium allyl sulfonate as monomers. The product was characterized and its properties were investigated. It was concluded that the product has excellent scale inhibition and dispersion performance and good biodegradability. The product is an environmentally friendly water treatment agent.
Research progress and hotspot analysis of heavy metal pollution of sediments in the Bohai Sea based on CiteSpace literature metrology
Authors: Li Yipeng , Yu Liming
Published: June 2023

Using the core collection of Web of Science and the literature of CNKI as data sources, this study uses the Citespace knowledge map analysis tool to analyze the annual publication volume, author group, publication organization, keyword clustering, and the emergence of heavy metals in Bohai Sea sediments. Then explore the research status, hotspots, and future development trends of heavy metals in Bohai Sea sediments. The organization with the most publications is the Chinese Academy of Sciences. The author with the most publications is Liu Jihua from the Qingdao National Marine Science and Technology Laboratory. The study of heavy metals in Bohai Sea sediments focuses on some areas' spatial distribution, risk assessment, and source analysis. In the future, we will further explore the large-area and long-term spatiotemporal distribution characteristics, quantitative source analysis, and comprehensive evaluation system of heavy metals in Bohai Sea sediments.
Development Status and Carbon Dioxide Emission Forecast of Power Industry in Guangxi
Authors: Chen Xuemei , Yan Shiyang , Mo Zhaoyu , Nong Chuan , Chen Zhiming , Liu Huilin , Wang Zhifeng , Li Hao
Published: June 2023

This paper uses the Long-range Energy Alternatives Planning(leap) system model to predict the carbon dioxide emissions of the power industry and calculate the carbon peak platform period of the power industry in Guangxi, which is based on the development status of the power industry and the energy and power development plan in Guangxi during the "14th Five-Year Plan". The results show that the power structure of Guangxi is at an excellent level in the country. In 2021, the installed proportion of clean energy is 55.1% (the national average level of 44.7% in 2020), and the proportion of thermal power generation is 55.7% (the national average level of 68.5% in 2020). With the strong economic recovery , the demand for electricity in Guangxi will continue to increase. By 2025 and 2030, the electricity consumption of the whole society will reach 2.9 ×1012 kW•h and 3.7×1012 kW•h, respectively, with an average annual growth rate of about 7.1% and 5.3%. The installed power generation capacity will reach 9.4 ×107 kW and 1.5 ×108 kW, respectively. The power generation will reach 3.0 ×1012 kW•h and 4.2×1012 kW•h electricity, respectively. However, Due to the influence of resource endowment, meteorological conditions, energy storage technology and other constraints on non-fossil energy power generation, it is difficult to achieve large-scale replacement of traditional energy power generation in a short term. It is estimated that coal power production will account for 45% and 30% of the total power generation respectively in Guangxi by 2025 and 2030. Coal power will continue to be the main provider of power security for a long time in the future. Therefore, according to the current situation of power development planning, it is estimated that the carbon emission of Guangxi will reach 9.2×107 t by 2030. The carbon peak platform period of power generation industry will appear in 2029 to 2032, with a peak value of 1.1 × 108 t.
Characteristics of air quality changes in Quanzhou during the COVID-19 epidemic
Authors: Jingwei Sun , Linwei Deng , Yunfeng Zhang
Published: June 2023

On January 8, 2020, there was an outbreak of coronavirus disease 19 (COVID-2019), and on January 24, 2020, Fujian Province issued the "Fujian Provincial Emergency Plan for Public Health Emergencies", which restricted crowd gathering activities such as markets, greatly reducing transportation and industry. The difference between air quality before and after the epidemic was studied, and the results show that the mass concentrations of SO2, NO2, CO, PM10, and PM2.5 in Quanzhou City in February 2020 all decreased in January, with decline rates of 5.8–8.8%, 34.7–46.7%, 14.9–25.1%, 9.4–15.9%, and 5.4– 14.3%; O3 did not show the same change pattern. NO2, CO, O3, PM10, and PM2.5 decreased compared with the same period in 2018 and 2019, of which SO2 and NO2 declined the most, and CO and O3 declined the least. The spatial distribution map of air quality in Quanzhou City in the first half of 2020 was obtained by the Arcgis anti-distance weighting method, and the results showed that the Qingyuanshan area had the best air quality in Quanzhou and was the least affected by the epidemic; the air quality in Tushan Street and Jintoupu changed the most, showing the most obvious impact of the epidemic. The changes in air quality in Quanzhou during the epidemic period show that traffic and industrial pollution sources were more likely to be affected by the epidemic, and the sources of domestic pollution were relatively stable.
Assessing Heavy Metals in Sediment of Beijing-Hangzhou Grand Canal by Statistical and Geochemical Analysis
Authors: Wu Lijun , Li Shiyi , Ying Feng , Huang Senjun
Published: June 2023

Statistical analysis and geochemical approaches were exploited for the heavy metals (HMS) assessment in sediments from Beijing-Hangzhou Grand Canal. Single source (crustal) was identified using principal component analysis (PCA). Furthermore, enrichment factor (EF) denoted contaminated sites by HMS in the study area while EF value reveal minor enrichment or no anthropogenic enrichment from most sites. The anthropogenic activities that suggested to be primarily from agriculture and automobile repair discharge.
Study on Treatment Techniques for Food Waste and Municipal Sludge in County-Level Cities in Guizhou Province
Authors: Yu Can , Ma Qing , Tan Ning , Zhang Ya , Zhang Qing
Published: June 2023

Based on the characteristic of food waste and municipal sludge and the adaptability of various treatment techniques, comparisons of economic efficiency are proposed against the ubiquitous problems concerning food waste and municipal sludge disposal in county-level cities in Guizhou Province. And aerobic fermentation and hermetia illucens-based bioconversion are recommended for municipal sludge and food waste, respectively, to maximize resource reclamation and utilization.
Research on Mesoscopic Characteristics of Limestone Grouting Diffusion Based on Discrete Fracture Network
Authors: Li Jiawen , Zhan Shugao , Zhong Zuliang , Wang Yi
Published: June 2023

The limestone stratum has well-developed rock fissures and abundant groundwater. Under extreme rainstorm conditions, tunnel surrounding rock seepage is serious especially. In order to reveal the grouting diffusion mechanism of karst fractured rock mass and realize effective water plugging, in this paper, the basic mechanical parameters of limestone are obtained by laboratory triaxial test, and the porosity distribution of rock mass is obtained by nuclear magnetic resonance test. The PFC2D discrete element software is used to simulate the mechanical characteristics of compressive deformation and fracture propagation pattern of the limestone and compared with the triaxial test results. Discrete fracture network theory is used to establish PFC2D numerical simulation of grouting diffusion model of fractured rock mass. And the filling diffusion mechanism and stress variation rule of cement slurry in fractured limestone under different grouting pressure are studied. The results show that (1) During the grouting process, the micro-cracks expand along the tip of the existing cracks, and extend to the surrounding cracks to finally form through cracks, so as to achieve the effect of grouting reinforcement. (2) With the increase of grouting pressure, the maximum displacement of particles increases continuously, but with the prolongation of grouting time, the maximum displacement of particles reaches a stable state and no longer increases. (3) During the grouting process of the fractured rock mass, with the increase of grouting time, the stress of the fractured rock mass finally reaches a stable state. This study provides an important reference for the setting of grouting parameters of limestone rock mass.
Development process and trend of medium and low yield field reconstruction in Shaanxi Province
Authors: Lei Na , Li Yanan , Zhang Jing
Published: June 2023

The transformation of medium and low yield grain fields is an important part of cultivated land regulation, which is basically consistent with the requirements of high standard farmland construction. The cultivated land consolidation has experienced from overcoming the single limiting factor to exploring the integrated factors combining the adjustment of ownership and then to the ecological landscape construction target, which has put forward different requirements on the engineering construction, land capacity improvement and management organization innovation integration of cultivated land consolidation. At present, the concrete measures of land leveling, irrigation and drainage, field road and forest protection network have been studied in the field engineering construction of medium and low yield grain fields in Shaanxi province. In the aspect of soil fertility improvement, effective measures such as ditch treatment, soil fertility improvement, soil layer recombination and crop optimization were studied. In the aspect of management organization innovation, the research of property right model combining different yield reform mode and different cultivated land consolidation mode has promoted the optimization and transformation of medium and low yield grain fields in different degrees.
Heavy Metals Pollution in Soil Around the Lead-zinc Smelting Plant in guanzhong Plain
Authors: Cao Xiaohui , Yuan Meng , Zhang Yan
Published: June 2023

[Objective] T To analyze and determine the content of eight heavy metals Cd, Cr, Cu, Pb, Hg, Zn, As, and Ni in 40 soil samples collected around a lead-zinc smelting plant in Guanzhong through experimental analysis, and to preliminarily grasp the content of heavy metals in the soil around the smelting plant, and to conduct pollution research and evaluation.. [Method] In mid to late April 2020, 40 soil samples (with a sampling depth of 0-30 cm) were collected from the vicinity of a lead zinc smelter in Guanzhong. The heavy metal content was determined through transcoding, natural air drying, and grinding processes.. [Results] The average contents of Cd, Cr, Cu, Pb, Hg, Zn, As, and Ni in the soil around a lead zinc smelter in Guanzhong were 0.40, 85, 26.0, 48, 0.078, 108, 12.5, and 26 mg. kg-1, respectively. Except for Ni, the average contents of Cd, Cr, Cu, Pb, Hg, Zn, and As were higher than the background values of soil elements in China and Shaanxi Province, especially Cd, Hg, and Pb, The content is 4.26, 2.60, and 2.28 times the background values of soil elements in Shaanxi Province, and 4.12, 1.2, and 1.85 times the background values of soil elements in China. By calculating the standard deviation and coefficient of variation, it was found that the standard deviation and coefficient of variation of Cd, Pb, and Zn in the soil around the smelter were relatively large, indicating that these three heavy metal elements accumulated significantly in the soil.. [Conclusion] The soil around a lead-zinc smelter in Guanzhong is mainly contaminated by multiple heavy metal complexes, mainly Cd pollution. The atmospheric sedimentation around the smelter and dust from mining sites may be the main sources of pollution..
Preliminary application of grade equivalent theory in a local section of a mine and economic estimation of the deposit
Authors: Wang Guan , Song Huaqiang , Yang Zongda , Wang Lize , Xue Pei , Xu Jingyuan , Jiang Wei
Published: June 2023

By introducing the practical application of grade equivalent theory in a copper -cobalt mine, it can show the maximum economic value of the individual ore block and the mine, maximize the comprehensive utilization of limited resources and contains positive significance for extending the service life of the mine. Briefly introducing the steps of Micromine software in the process of reserve estimation and the feasibility of displaying the economic value of individual ore blocks. Estimation of reserve can be completed objectively and scientifically by Micromine software, grade and economic value of ore blocks can be displayed in three-dimensional image.
Effects of water bath digestion and DEENA pretreatment on mercury content detection in soil
Authors: Zhang Yabo
Published: June 2023

There are many sample preparation methods for heavy metal detection of soil samples, but each has its advantages and disadvantages. Based on the above two pretreatment methods, the detection limit, precision, accuracy and actual soil sample measurement value of mercury detection in soil by atomic fluorescence were compared with atomic fluorescence, and the results showed that the automatic digestion and pretreatment system (DEENA) could digest soil samples to meet the requirements of GB/T 22105.1-2008 standard. Moreover, there was no significant difference between the two digestion methods on the detection results of mercury in soil, and the automatic digestion and preparation system (DEENA) was convenient, operable and highly automated, which was more advantageous for sample digestion.
Dynamic Response of Shrubbery Fire to Meteorological Changes in Yunnan Province
Authors: Wang Qingqing , Gao Zhongliang , WangHe Chenyang , Cao Yufei , Yu Wentian
Published: June 2023

This paper takes shrubland fires as the research object and selects typical shrubland forest fire cases that occurred throughout Yunnan Province from 1954 to 2018 as the research samples, and the shrubland fire loss elements and meteorological data are studied by SPSS correlation analysis and MATLAB gray prediction model to analyze shrubland fires and meteorological elements. The results showed that there were significant correlations between shrubland fires and meteorological data; the shrubland fire over fire area, forest damage area, and economic loss composite data index showed positive correlations with annual maximum temperature, annual average minimum temperature, annual average temperature, and annual sunshine hours; the annual average relative humidity, precipitation days, and the composite index of the same day meteorological data showed significant negative correlations, etc. In exploring the main meteorological factors affecting the distribution of forest fires, we establish a meteorological fire model to provide a real and credible scientific basis and theoretical foundation for future forest fire prevention and prediction.
UAV's air combat decision-making based on deep deterministic policy gradient and prediction
Authors: LI Yongfeng , LYU Yongxi , SHI Jingping , LI Weihua
Published: June 2023

To solve the enemy uncertain manipulation problem during a UAV's autonomous air combat maneuver decision-making, this paper proposes an autonomous air combat maneuver decision-making method that combines target maneuver command prediction with the deep deterministic policy algorithm. The situation data of both sides of air combat are effectively fused and processed, the UAV's six-degree-of-freedom model and maneuver library are built. In air combat, the target generates its corresponding maneuver library instructions through the deep Q network algorithm; at the same time, the UAV on our side gives the target maneuver prediction results through the probabilistic neural network. A deep deterministic policy gradient reinforcement learning method that considers both the situation information of two aircraft and the prediction results of enemy aircraft is proposed, so that the UAV can choose the appropriate maneuver decision according to the current air combat situation. The simulation results show that the method can effectively use the air combat situation information and target maneuver prediction information so that it can improve the effectiveness of the reinforcement learning method for UAV's autonomous air combat decision-making on the premise of ensuring convergence.
Research on process-oriented standard requirements generation technique for equipment research & development
Authors: WANG Changxi , TANG Wei , LIU Qiguo , ZHANG Xiaoming
Published: June 2023

Standard requirement generation method is a core technique of standard formation. Due to the lack of systems approach, missing of standard technical elements, weak correlation between standards and research and development(R & D) activities are appeared frequently. Deficiencies in integrity, applicability and traceability of standards can be observed noticeably, which makes the equipment standards cannot bring into full play of cost reduction and efficiency improvement, cannot promote the equipment technology development effectively. According to the positive development requirements of independent and controllable standards, an activity-based standard requirement capture scene model is defined, a mechanization of standard requirement identification is described, a standard configuration, standard element definition and standard requirement integration methods are provided, a mapping matrices of activities, tools, database and standard requirement are established, a process-oriented standard requirements generation method for equipment R & D is finally proposed. By applying in aircraft engine compressor aerodynamic design field, the proposed method shows that the effectiveness of the building relationships between the standards and equipment R & D activities, which can ensure the integrity, availability and uniqueness of standard requirements, support equipment standard systems independent and controllable development.
Zusammenhang zwischen Rekonvaleszenz passiver Strukturen und
Biomechanik beim Pferd
Authors: Döringshoff Ralf
Published: June 2023

Für den langfristigen Erfolg sowohl veterinärmedizinischer als
auch manualtherapeutischer Maßnahmen, ist es wichtig, die Ursache
für die Strukturschädigung zu erkennen bzw. zu finden. Ein
Hauptgrund für Lahmheiten ist oft ein sich schleichend entwickelnder
unnatürlicher Bewegungsablauf. Deshalb ist es wichtig, die
natürliche Bewegung in ihrem Ablauf, ihre Bedeutung und daraus
resultierend ihre Bedeutung für den Heilungsprozess zu verstehen.
Behandlung einer Katze mit hochgradiger Kontraktur des M.
masseter
Authors: Geisler Linda
Published: June 2023

Der folgende Bericht schildert den herausfordernden Fall einer Katze mit
hochgradiger Kontraktur des M. masseter. Muskelkontrakturen kommen vermutlich
häufiger vor, als sie in der tierärztlichen Praxis
tatsächlich diagnostiziert werden. Dieser eindrucksvolle Fall zeigt, wie
diagnostisch vorgegangen wurde und welche therapeutischen Maßnahmen
letztlich zum Erfolg führten.
Angeborene Fehlbildungen der ableitenden Tränenwege
Authors: Heichel Jens , Heindl Ludwig M. , Struck Hans-Gert
Published: June 2023

Die konnatale Tränenwegstenose ist der häufigste Grund einer ophthalmologischen Konsultation im Kindesalter. Sie ist mit Abstand am häufigsten bedingt durch eine persistierende Hasner-Membran. Aber es können selten auch angeborene Fehlbildungen der Tränenwege auftreten. Im Bereich der proximalen ableitenden Tränenwege kann es zur Anlage überzähliger Tränenpünktchen und Tränenröhrchen kommen, aber auch zu Divertikeln, Fisteln und Atresien. Die distalen ableitenden Tränenwege können von Fisteln, Amniotozelen und Zysten betroffen sein. Eine Assoziation von Tränenwegfehlbildungen mit angeborenen systemischen Erkrankungen wird in ca. 10% der Fälle beschrieben. In Abhängigkeit vom Schweregrad der Symptome kann eine chirurgische Sanierung erfolgen, wobei endoskopische Verfahren mit den Möglichkeiten der modernen Tränenwegschienungen wichtige Ergänzungen darstellen.
Fall für Drei – Rehabilitation nach Mehrfachamputation
Authors: Breier Susanne , Schröter Johannes
Published: June 2023

Nach einem Unfall kam der 33-jährige Leon ins Krankenhaus und wurde an der Schulter operiert. Zu diesem Zeitpunkt ahnt noch niemand, dass ihm aufgrund einer Sepsis wenige Woche später alle vier Extremitäten amputiert werden müssen. Eine Orthopädietechnikerin, eine Physio- und eine Ergotherapeutin berichten, wie sie den Klienten in der Reha begleitet haben.
Tipps und Tricks beim erschwerten Stimmprothesenwechsel und ein neues retrogrades Wechselverfahren
Authors: Barth Christine Mi-He , Barth Charlotte Helene
Published: June 2023

Stimmprothesen bieten laryngektomierten Patienten die Möglichkeit, postoperativ schnell verbal zu kommunizieren, was soziale Interaktionen erleichtert, die Rehabilitation beschleunigt und die Lebensqualität enorm verbessert.

Gründe, die einen Stimmprothesenwechsel mehrfach im Jahr erforderlich machen, sind zahlreich. Der Prothesenwechsel lässt sich hierbei meist problemlos ambulant bei leichter Oberflächenanästhesie der Trachea durchführen. In manchen Fällen gestaltet sich der Prothesenwechsel jedoch schwierig. Die Ursachen hierfür und mögliche Problemlösungen mit Schwerpunkt auf einem retrograden Wechselverfahren sollen hier dargestellt werden. Der Artikel soll insbesondere als Hilfestellung für Kollegen dienen, die ihre Behandlungsmöglichkeiten beim Stimmprothesenwechsel erweitern möchten.
Sakralnervmodulation in der Therapie der Stuhlinkontinenz und Obstipation: Evidenz, Programmierung und Langzeitmanagement
Authors: Bittorf Birgit , Matzel Klaus
Published: June 2023

Hintergrund Die sakrale Neuromodulation (SNM) hat sich in den letzten 2 Jahrzehnten fest in der Therapie funktioneller Beckenbodenerkrankungen etabliert. Trotz nicht vollständig
geklärtem Wirkungsmechanismus ist sie zum bevorzugten Verfahren in der chirurgischen Therapie der Stuhlinkontinenz geworden.

Methoden und Ergebnisse Es wurde eine aktuelle Literaturanalyse zur Schrittmacherprogrammierung sowie zu Langzeitergebnissen der SNM bei Stuhlinkontinenz und Obstipation
durchgeführt.

Die SNM bei Stuhlinkontinenz zeigt sich auch im Langzeitverlauf erfolgreich. Über die Jahre konnte das Indikationsspektrum auf Patienten mit Sphinkterläsionen ausgeweitet werden. Die
Anwendung beim Low Anterior Resection Syndrome (LARS) nach Rektumresektion ist aktuell in klinischer Erprobung. Bei den verschiedenen Formen der Obstipation hingegen ist die Wirkung der
SNM nicht eindeutig belegbar. In mehreren randomisierten Cross-over-Studien konnte kein Erfolg nachgewiesen werden, auch wenn dieser möglicherweise für Untergruppen der Obstipation
besteht. Zum jetzigen Zeitpunkt kann die Anwendung nicht allgemein empfohlen werden.

Die Schrittmacherprogrammierung definiert Elektrodenkonfiguration, Stimulationsamplitude, Pulsfrequenz und Pulsbreite. Während die Einstellung von Pulsfrequenz und -breite eher anhand
standardisierter Werte erfolgt und meist als Niederfrequenzstimulation mit einer Frequenz von 14 Hz und einer Pulsbreite von 210 s durchgeführt wird, werden Elektrodenkonfiguration und
Stimulationsamplitude individuell an den einzelnen Patienten angepasst. Insbesondere im 1. postoperativen Jahr können Reprogrammierungen aufgrund von Wirkungsverlust oder Nebenwirkungen
erforderlich werden.

Trotz geringer Häufigkeit von Infektionen und Elektroden-/Impulsgeberfehlfunktionen benötigen im Langzeitmanagement bis zu 65% der Patienten operative Revisionen. Diese sind bei etwa 50%
bedingt durch erwartbare Batterieerschöpfung des Impulsgebers. Auch mindestens eine Reprogrammierung wird bei 75% der Patienten im Verlauf erforderlich, meist aufgrund einer
Wirkungsveränderung, seltener aufgrund von Schmerzen. Regelmäßige Nachuntersuchungen sind empfehlenswert.

Schlussfolgerung Die SNM hat sich in der Langzeittherapie der Stuhlinkontinenz als sicheres und erfolgreiches Verfahren bewährt. Um einen optimalen Therapieerfolg zu erzielen, ist
eine strukturierte Nachsorge erforderlich.
Tailored Approach in der Therapie der Hämorrhoidalleiden
Authors: Pfeil Christian , Pelz Jörg , Dusch Niloufar
Published: June 2023

Das symptomatische Hämorrhoidalleiden ist einer der häufigsten Gründe für das Aufsuchen einer koloproktologischen Einrichtung. Neben der typischen Anamnese ist der Untersuchungsbefund
inkl. Proktoskopie wegweisend. Die überwiegende Mehrheit der Patienten kann konservativ mit sehr gutem Ergebnis hinsichtlich der Lebensqualität behandelt werden. Insbesondere durch
Basistherapie mit Stuhlregulation, korrektem Stuhlverhalten und Sklerosierungstherapie kann stadienunabhängig eine gute Symptomkontrolle erreicht werden. Bei Versagen der konsequenten
konservativen Therapie stehen verschiedene operative Verfahren zur Verfügung. Entscheidend für die Auswahl des Verfahrens ist der individuelle Befund des Patienten im Sinne eines Tailored
Approachs. Neben den klassischen segmental resezierenden sowie zirkulär pexierenden Operationen gehören auch neuere, z. T. weniger invasive Methoden wie Hämorrhoidalarterienligatur mit und
ohne Rectoanal Repair (HAL-RAR), Infrarottherapie (IRT), Lasertherapie (LT) und Radiofrequenzablation (RFA) zum chirurgischen Repertoire. Blutung, Schmerz, Inkontinenz sowie Rezidiv
stellen mögliche Risiken der operativen Therapie dar.
The concept of inclusive education from the point of view of academics specialising in special education at Saudi universities
Authors: Madhesh Abdullah
Published: June 2023

Inclusive education is one modern trend that many countries seek to adopt as an innovative concept and pursue to practice as an application in conjunction with scientific progress, the education of people with disabilities, and in order to fulfil and abide by the relevant international conventions. As a result, this study aims to discover what inclusive education means among Saudi universities and academics specialising in special education. To achieve the goal of the study, qualitative research was used by employing semi-structured interviews as the single elementary tool for data collection by interviewing the study sample, which consisted of 12 faculty members specialising in special education. Through complete analysis, the study reached a set of general results, which is the presence of ambiguity in the concept of inclusive education among the participants, with confusion between the concept of inclusive education and some other concepts such as “integration,” “mainstreaming,” and “placement.” In addition, there is a belief that there is a correlation between the concept of inclusive education and special education. Finally, the study concluded with some recommendations on the topic of research.