bluuebunny/crossref_metadata_2025_split huggingface dataset:
Steady dynamic buckle propagation simulation of confined pipelines under external pressure by user defined elements in ABAQUS
Authors: Yan Sunting , Ling Zhangwei , Chen Yonggui , Jin Zhijiang 
Published: February 2021

Abstract
This paper simulates steady dynamic buckle propagation of confined linearly elastic pipelines under external pressure by developing a user-defined-element in Abaqus allowing the simulation of dynamic propagation through conventional static step. The simulation is separated into two parts: the static indenting step to deform a pipeline locally and the steady dynamic propagation step to obtain the relationship between the deformation profile and propagation speed.
Analysis on pollution prevention and control of waste lead battery recycling process
Authors: Wei Mengxiao , Ma Jun , Gao Tao 
Published: February 2021

Abstract
From the perspective of recycling, waste lead-acid batteries have very objective utilization value. However, from the perspective of environmental protection, waste lead-acid batteries contain many pollutants, which will cause serious pollution and damage to the environment if not handled properly. Containing lead, not only has a very high collection value, also is likely to lead pollution and poisoning accidents caused by improper operation, cause a threat to people’s life and health, therefore, this text set about from the pollution source analysis, through the way of recycling and pollution prevention and control technology were analyzed, and aims to take certain measures to protect the environment, protect health.
Analysis and Research on the Value of Farmland Transfer Based on Environmental Protection Evaluation System
Authors: Zhang Zhenyu , Tian Minghua , Li Jianjun , Wang Fang , Ma Shuang 
Published: February 2021

Abstract
In order to coordinate the farmland transfer and the construction of the ecological environment, this paper first introduces the main work content and the main benefits of farmland transfer, and then separately elaborates the land leveling, farmland water conservancy, field roads and other projects in the process of farmland transfer. Value analysis of the impact on the ecological environment of farmland, and analysis of the problems existing in the value of farmland transfer: neglect of ecological environment protection, unreasonable arrangement planning and construction technology, lack of specific normative guidance for protecting the ecological environment during the arrangement process. The results of the study show that the evaluation of the ecological value of farmland can be used to guide the rational external transfer of farmland, which is beneficial to the protection of farmland. At the same time, it also has certain guiding significance for returning farmland to forests and lakes. Therefore, it is necessary to evaluate the ecological value of farmland.
Research on Pipe Jacking Construction Technology Based on Upcrossing Metro and Cable Tunnel
Authors: Wang Qiang , Liu Zong , Yang Guangwu , Wang Haoliang 
Published: February 2021

Abstract
Based on the sewage pipeline defect repair project of Shizuo Road, Baiyun District, Guangzhou City, this article uses traditional technology to repair the basic pipelines of the old and new urban areas and the environmental conditions of the construction section. The pipe jacking construction in the trenchless repair is used to cross the subway and the construction pipeline. The complicated construction technology of the cable tunnel is discussed. Using the Peck empirical formula to estimate the ground settlement and its deformation pressure on the surrounding tunnels, the maximum deformation of the tunnel pipeline in the soil disturbance area during the construction process of the project is 0.80mm, and the maximum deformation of the subway tunnel is 1.42mm, which accurately reflects the roof The impact of pipe construction on the soil of surrounding tunnels. And study the disturbance influence of the two soil stabilization technologies of high pressure jet grouting pile and work well top-down construction method on the surrounding soil during the construction process, minimize the disturbance influence of the pipe jacking construction method on the surrounding soil, and ensure the construction quality and safety of the site.
Experimental Study on a Target Direction Finding Algorithm for Gas Leakage Detection in Underwater Structures
Authors: Na Jiesi , Yue Lei , Zhuang Rui , Yang Chong 
Published: February 2021

Abstract
Aiming at the application scenarios of underwater structure gas leakage detection in marine oil and gas development process, the power spectrum characteristics of underwater structure gas leakage radiation noise are analyzed. An new target direction finding algorithm is proposed, and the gas leakage detection-finding software is designed. Then, the test platform is built to complete the experimental study of underwater structure gas leak detection. The test results show that the new target direction finding algorithm used in this paper is compared with the conventional beam forming algorithm. The difference between the maximum beam energy value and the sub-maximum value is bigger, indicates that the target’s resolving power is strong, which effectively improves the detection capability of gas leakage targets in underwater structures.
Monitoring of plankton diversity in Dianchi Lake by environmental DNA technology
Authors: He Liwei , Zhang Lijuan , Yang Jianghua , Zhao Zheng , Zhou Xiaohua , Feng Qing , Zhang Xiaowei , Xu Shan 
Published: February 2021

Abstract
Surveys of zooplankter and phytoplankton through environmental DNA (eDNA) and metagenomic technology across Dianchi Lake and the estuary of inflowing rivers was conducted, to evaluate the microbial diversity of Dianchi Lake and the estuary of four in flowing rivers. Diversity of plankton and the similarity of dominant species results revealed that the dominant eukaryotic phytoplankton in Dianchi Lake was Bacillatiophyta. The Shannon diversity index values of phytoplankton and zooplankton ranged from 3.68 to 18.36 and 0.54 to 2.49, respectively. The main genus taxa in the Dianchi Lake were similar with the inflowing river. The distribution map of Shannon diversity index gave overall insight into the variation of plankton diversity. The research proved that the eDNA technology was effective in biodiversity monitoring in aquatic ecosystem, and the inflowing river may impose an adverse influence on the ecosystem health of Dianchi Lake.
Research on the Temporal and Spatial Characteristics of Ecological Civilization Attention Based On Baidu Index
Authors: Zhang Xuan 
Published: February 2021

Abstract
Ecological civilization is China’s millennium project, is the crucial point to build a beautiful China. With “ecological civilization” as a crucial word, through the analysis of the public attention of 31 provinces (cities and districts) in China from 2011 to 2020, the paper analyzes the changes of the domestic attention to “ecological civilization” from the two dimensions of time and space combined with the coefficient of variation, and studies the influencing factors of the search attention to ecological civilization by means of geographical detectors. Conclusion: 1) Public attention is highly sensitive to policies and relevant punishment measures for ecological civilization with the nature of encouragement and protection and pays high attention to them. The media index shows an inverted “V” type change, which indicates that the media pay less attention to the ecological civilization in the early stage and lack of continuous attention to it in the later stage. 2) On the whole, the spatial characteristics of ecological civilization attention are more in the east and less in the west, and more in the north and less in the south. Since 2015, the spatial difference of search index has become smaller and its geographical distribution is more balanced, but the problem of regional differentiation and alienation still exists for a long time. 3) PC products in the early stage, as the main means for people to understand ecological civilization, played an important role in the popularization of ecological civilization. Mobile terminals in the later stage should be taken as key publicity objects to play a greater role in publicity and education. 4) Economic, infrastructure and other factors have a great impact on the attention paid to ecological civilization construction.
Study on Methane Emission Factor of Paddy Fields in Hubei Province
Authors: Jiang Yinhua , Zhang Hui , He Jiajun , Huan Ping 
Published: February 2021

Abstract
Methane is one of the most important greenhouse gases, contributing about 15% of global warming, and agricultural activity is the largest source of methane, accounting for 50.15% of the country’s total emissions. Accurate estimation of methane emission factors in paddy fields is of great significance to the statistics of agricultural greenhouse gas emissions and the implementation of relevant emission reduction measures. According to the method recommended by IPCC, the average methane emission factor of single season rice is 470 kg/hm2, the average emission factor of fresh rice is 330 kg/hm2, the average methane emission from late rice is Factor of 220 kg/hm2.The factors that affect the methane emission in paddy fields in Hubei Province are mainly water management measures and soil environment.
Analysis and evaluation of air quality in Shandong province based on AHP
Authors: Li Qina , Ji Min , Sun Yong , Zhai Xueying , Zheng Yan 
Published: February 2021

Abstract
In recent years, the rapid growth of economy and population has led to the continuous deterioration of air quality, so the evaluation of air quality is particularly important. According to the atmospheric environmental quality standard, this paper takes five evaluation factors as the criterion layer for the first time (SO2, NO2, CO, O3 and PM2.5), in addition, it is the first time to add the observation station as the sub criterion layer. Finally, the hierarchical structure model is constructed and the air quality of Shandong Province in the 12 months of 2016 is evaluated respectively. The results show that: in 2016, the period of better air quality in Shandong Province is mainly in summer, while in winter, the air quality is poor but the fluctuation is small; from the spatial distribution situation In a year, the region with the best air quality is the eastern coastal cities, followed by the central and western regions; in terms of the total number, the number of cities with poor air quality rating is the largest, followed by the cities with good air quality rating, and the cities with excellent air quality rating are the last, that is to say, the overall air quality of Shandong Province in 2016 is poor.
Research on Integration Track and Quantity System of Agricultural Products Logistics Resources in Low Carbon Environment
Authors: Gao Wei , Pan Ying , Shi Xiaoxue , Wu Yuxin 
Published: February 2021

Abstract
At present, my country’s agricultural product logistics is still in its infancy, the agricultural product circulation system is still relatively backward, the agricultural product circulation links are too many, the logistics technology level is low, the logistics cost is high, and the agricultural product circulation information is not smooth. In the context of low-carbon economy, in order to promote the integration of resources in the agricultural product supply chain system, optimize the operation between organizations and make it similar to the internal operation of the organization, and realize the rationalization and maximization of overall benefits, supply chain integration should be used Thought, carry out integrated management of agricultural product logistics, build a supply chain integrated agricultural product logistics model, and promote the integration of agricultural product production links, the integration of circulation links, and the integration of the supply chain of production and circulation links.
Research on Treatment Measures and Treatment Effects of Black and Smelly Water Body in Shenyang Area
Authors: Liang Kun , Feng Xiaoyu , Yang Bin , Dou Zhiqiang , Chen Wen 
Published: February 2021

Abstract
Taking Shenyang City as an example, the current situation and progress of the treatment of black and smelly water bodies in the built-up area of Shenyang City are summarized from three aspects: the distribution of black and smelly water bodies, completed renovation measures, and problem identification and diagnosis. Aims. Based on the analysis results of the pollution load of the black and smelly water body catchment unit, the remediation plan and measures for the black and smelly water body in the built-up area of Shenyang City are clarified, and the experience and effectiveness of the black and smelly water body treatment are summarized and analyzed.
Research on Ultrasonic Treatment in the Field of Actual Excess Sludge Treatment
Authors: Zhao Wei , Zhan Xianhui , Liu Weilin , Wang Shuang , Deng Jiangyang , Wei Daiyan , Sun Meng 
Published: February 2021

Abstract
It is generally known that that the carbon source is always insufficient in biological denitrification, and the excess sludge is difficult to dispose of in wastewater plants. This study explored the optimized ultrasonic treatment method for the excess sludge for denitrification of sewage. The response surface methodology of three factors and three levels was used to investigate the effects of ultrasound energy density, ultrasonic time and pH on cell-lysis rate, and the optimum process parameters for ultrasonic treatment for excess sludge were confirmed. The optimum cell-lysis rate was 33.891 ± 0.5% at the ultrasonic sound energy density was 2.0 W·mL−1, ultrasonic time was 40 min and pH was 7.0. The detection of the coliforms including E.coli before and after ultrasonic cracking showed that the ultrasonically cracked sludge could kill these pathogenic bacteria and achieve the effect of making the excess sludge harmless. The ultrasonic treatment experiments showed that ultrasonic treatment could inactivate these pathogenic bacteria (including E.coli) and make the excess sludge harmless.
Comparative analysis of aroma substances of vanilla co-fermented black tea
Authors: Wu Juxian , Wu Xiaorong , Yuan Guoan , Chen Xuexun , Shi Xiaoyan , Chen Haibing , Huang Baiqi 
Published: February 2021

Abstract
Different tea-making processes are different, and the aroma substances and main components of the tea-like products are different. The types of aromas and tastes of tea after processing are different. Vanilla, like tea, needs to be fermented and processed before it presents an attractive milk flavor. Based on the co-fermentation process of vanilla and tea, this study developed co-fermented black tea, and compared the aroma and content analysis of ordinary black tea and co-fermented black tea. The results showed that the special aroma substances of co-fermented vanilla black tea contained 2,3-dihydro-2,2,6-trimethylbenzaldehyde (0.42%); GermacreneD (1.54%); 3,7,11 -Trimethyl-1,6,10-dodecantrien-3-ol acetate (0.28%). It is a new type of mixed black tea product with richer ingredients and unique aroma.
Investigation and Analysis of China’s Rural Water Environment Status under the Background of Rural Revitalization
Authors: Yu Xialei , Yang Qiwen , Gao Wanting , Tao Yan , Chen Xu 
Published: February 2021

Abstract
The pollution of rural water environment has become a key bottleneck restricting China’s rural revitalization strategy. Based on the strategy of rural revitalization, this paper uses literature research methods, semi-structured interviews and questionnaire survey methods to investigate and analyze the current rural water environment of four villages in Changzhou, Jiangsu Province. We found that excessive sewage discharge from industrial and agricultural production, poor living habits of villagers, gaps in government supervision and insufficient funds are the main reasons for the deterioration of the rural water environment. Therefore, we put forward relevant policy recommendations based on the main body of water environment governance.
Adsorption and Desorption Characteristics of Phosphorus on Sediments in Panzhihua Section of Jinsha River, China
Authors: Peng Hong , Jiang Anna , Wang Hao 
Published: February 2021

Abstract
To characterize P adsorption-desorption in the riverbed sediments, we studied sediment physicochemical parameters affecting P dynamics, adsorption-desorption parameters such as P desorption maximum, equilibrium P concentration and P desorption capacity of bed sediments by a batch experiment. The results showed that the adsorption-desorption rate of phosphorus on sediment obviously increased, then slightly decreased, and finally reached equilibrium at 90 min of reaction. The desorption concentration of phosphorus on the surface of sediment was 0.45 mg/L when the rotational speed was 250 r/min. The increase of sediment concentration facilitated the transformation of phosphorus from dissolved state to adsorbed state. When the sediment particle size was less than 0.074 mm, the equilibrium adsorption and desorption capacity of phosphorus were 0.47 mg/g and 0.43 mg/L, respectively. In addition, high temperature was beneficial to the adsorption of phosphorus, but rarely affect the desorption of phosphorus in the sediment. The pH value of solution has little impact on the adsorption and desorption of phosphorus.
Numerical Simulation for Dispersion Characteristics of Lamb Wave Propagation in Composite Laminates with Anti-Symmetric Surface Excitation
Authors: Liu Qi , Liu Mengxue , Li Jindong , Wang Teng , Xiao Wensheng 
Published: February 2021

Abstract
For the nondestructive testing based on ultrasonic Lamb waves, the center frequency of the excitation signal should be appropriately selected to excite the specific Lamb wave mode in composite laminates according to the dispersion curves. However, it is difficult to achieve the dispersion curves of Lamb waves in composite laminates by using analytical methods. In this paper, the three-dimensional finite element model with the anti-symmetric surface excitation is established to analyze the dispersion characteristics of Lamb wave propagation in a composite laminate. The fundamental anti-symmetric (A0) Lamb wave mode is excited in the composite laminate by applying a concentrated force load and an anti-symmetric concentrated force load. The characteristics of Lamb wave propagation in the composite laminate are studied. Moreover, the group velocities of the A0 Lamb wave mode propagating in the composite laminate are calculated under the excitation signals with twelve different center frequencies. The group velocity dispersion curve of the A0 Lamb wave mode obtained by the established model is consistent with that of the guided wave software GUIGUW, which demonstrates the effectiveness and feasibility of the three-dimensional finite element model on analyzing the dispersion characteristics of Lamb wave propagation in the composite laminate.
Enhancing red onion agribusiness development: e-planting calendar and production allocation
Authors: Wahyuni S , Hestina J , Setiajie I A , Suryani E 
Published: February 2021

AbstractRed onion farming faces some problems such as unstable price and supply, long marketing chain, and weak bargaining position of farmers as well as the quality of the onion. TheToko Tani Indonesia(TTI) program in 2017 attempted to solve the problem. The onions were bought byLembaga Usaha Pangan Masyarakat (LUPM)at 10% higher price than the market. There were 35tons/year medium-quality onions delivered to TTI, which located in a strategic location to provide consumers with easy access. The long supply chain was reduced to 3 chains (Farmers – LUPM - TTI). A research was conducted in 2018 (West and Central Java Provinces) to study the achievement of the program. Data was collected through the in-depth interview based on a structural questionnaire to 36 individuals related to the program. Results from the qualitative analyzes showed that one expected output namely shortens the supply chain, requires four modifications to be achieved. In conclusion, a packet of technology “E-Planting calendar and production Allocation” should be developed to monitor the implementation of planting and production allocation that could be monitored by related institutions.
Competitiveness effect of the UPSUS Program on rice production in West Java Province, Indonesia
Authors: Setiyanto A , Pabuayon I M , Quicoy C B , Camacho J V , Depositario D P T 
Published: February 2021

Abstract
The sustainability of rice self-sufficiency and export are expected from the implementation of the UPSUS Program on rice and the attention to the issues affecting the rice competitiveness become very important. Using rice farm household survey data, the study employed the Policy Analysis Matrix (PAM) and Kernel Density Estimation method of analysis. The study aimed to analyse the effects of the UPSUS Program on the global competitiveness of rice production and estimate the proportion of rice farms that produce competitively and the proportion of the total production that is produced competitively from the implementation of the UPSUS Program in West Java. Rice farming in the study sites was both financially and economically profitable before and after the implementation of the UPSUS Program and showed a slight decline in competitive and comparative advantages after the program. In 2020-2025, to increase rice competitiveness and achieving the target, the government should: (1) Maintain the area of rice planting and give more focus on higher productivity target; (2) Improve the adequacy and effectiveness of the various components of the program; and (3) Improve the provision of other services outside the program components that affect competitiveness of rice production.
Food security in the disaster-prone area: an empirical study from the rural area of Indonesia
Authors: Hidayat A R T , Rachmawati T A , Wahyuningtiyas L 
Published: February 2021

Abstract
Natural disasters affect food security due to low production in the affected areas, so that securing food is a top priority when a disaster occurs. This study aims to identify the food security status of a village located in disaster risk areas and formulates village development plans to reduce the risk of food insecurity. The case study area is Kaumrejo Village, Malang Regency as one of the most affected villages by the Kelud volcano eruption. This research employed a food security analysis based on the Ministry of Agriculture regulation regarding food security measurement and literature study. The results showed Kaumrejo village achieved food security a year after the disaster occurred. The status of this village’s food security quickly recovered even though local food production was hampered because the farmlands were covered by material from the eruption. One supported factors was the high import of food stocks from other regions. During the disaster response period, this village received huge support from the volunteers and the government. Upon disaster response period ended, village communities struggled to achieve their food security status as the farmland needed time to recover. The villagers need to establish alternative income generators to buy food supplies.