Synthesis and Preliminary Biological Activity of Selenium Polysaccharides from Tussilago farfara L.Liu, Simei; Ye, Shili; Zhao, Peng; Zhang, Lihua
doi: 10.1088/1742-6596/2706/1/012065pmid: N/A
Tussilago farfara L. selenium polysaccharides (STFPs, similarly hereinafter) were prepared by Selenous acid salt method from Tussilago farfara L. polysaccharide (TFP, similarly hereinafter). Taking the selenium content of STFPs as an indicator, the synthesis process of STFPs was optimized using response surface methodology based on single factor experiments. The optimal synthesis process conditions obtained are: 90 °C, 12 hours, selenide reagent ratio of 1.2: 1, HNO3 volume fraction of 0.7%, and the average selenium content of STFPs measured under these conditions is 2.338 mg/g. Characterization was carried out by measuring the selenium content, molecular weight, infrared spectroscopy. The results of antioxidant experiments showed that the maximum clearance rate of DPPH· by the selenium polysaccharide from Tussilago farfara L. was 73.16%, which were higher than from Tussilago farfara L. polysaccharides.
Research on a New Flow Measurement for Intelligent Injection ToolsWang, Min; Deng, Gang; Liu, Junli; Yue, Qingfeng; Sun, Yufei
doi: 10.1088/1742-6596/2706/1/012078pmid: N/A
Intelligent separate injection technology can achieve continuous monitoring data of layered water Injection wells. So it can find out the inefficient water circulating formation timely. Then the water injection schemes can be adjusted in real-time to ensure the high water injection pass rate. It can also increase the working efficiency of the workers’ because of its automatic mode.But its prime cost is high, which limits its large-scale industrialization application in fine layered water injection wells. The key part is the intelligent water distributor in the intelligent separate injection technology. The cost of electromagnetic flow meter accounts for 38% in the intelligent water distributor. The paper intends to research on flow measurement without flow meter to reduce the high-cost. The pressure difference equation was established for flow rate and the opening ratio of the nozzle using the dimensionless analysis method. The empirical parameters of the equation were obtained through laboratory experiments. The pressure sensors are used to monitor the pressure of water injection wells while achieving the measurement of layered flow rate.The laboratory experiments results indicate that the calculated flow rate obtained by this method coincides well with the standard flow rate. The relative error is less than 12%. Then,it provides a new flow measurement method for intelligent injection tools. The most significant feature is that the flow meter is no longer mandatory for intelligent water distributors. Due to the cheaper cost that it provides a technical support for the large-scale industrialization application of intelligent separate injection technology in fine layered water injection wells.
Prefacedoi: 10.1088/1742-6596/2706/1/011001pmid: N/A
PrefaceThe 11th Annual 2023 International Conference on Material Science and Environmental Engineering [MSEE2023] was held on November 24th, 2023 (Virtual Conference). The conference was held via Tencent Meeting Application. MSEE2023 aims to bring researchers, engineers, and students to the areas of Material Science and Environmental Engineering. MSEE2023 features unique mixed topics of Material Science and Advanced Materials, Material Engineering and Application, Environmental Science and Engineering and Mechanical Design and Technology.We received over 254 submissions from various parts of the world. The Technical Program Committee worked very hard to have all manuscripts reviewed before the review deadline. All the accepted papers have been submitted to strict peer-review, and selected based on originality, significance and clarity for the purpose of the conference. The conference program is extremely profound and featuring high-impact presentations of selected papers and additional late-breaking contributions. We sincerely hope that the conference would not only show the participants a broad overview of the latest research results on related fields, but also provide them with a significant platform for academic connection and exchange. There are three keynote speakers and four invited sessions. The keynote speakers are internationally recognized leading experts in their research fields, who have demonstrated outstanding proficiency and have achieved distinction in their profession. The proceedings would be published by IOP Journal of Physics Conference Series.We would like to express our sincere gratitude to all the members of Technical Program Committee and organizers for their enthusiasm, time, and expertise. Our deep thanks also go to many volunteers and staffs for the long hours and hard work they have generously given to MSEE2023. Last but not least, we would like to thank all the authors, speaker and participants for their great contributions to the success of MSEE2023.MSEE2023 Organizing CommitteeList of Committee of MSEE2023, Editor I, Editor II, Keynote Speaker I, Keynote Speaker II, Keynote Speaker III, Table of Content of MSEE2023 are available in this Pdf.
Exploration of Ecological Function and Restoration of Small and Micro WetlandsChen, Junlin; Zhang, Weihua
doi: 10.1088/1742-6596/2706/1/012075pmid: N/A
Due to their unique ecological functions, small and micro wetlands have received more extensive attention and recognition from the international community, and have become an important part of China’s ecological civilization construction. In this paper, the concept, characteristics and classification of small and micro wetlands are described, and the ecological functions and services of small and micro wetlands are discussed. On this basis, the principles of ecological restoration of small and micro wetlands were analyzed, and suggestions for the protection and management of small and micro wetlands were put forward, in order to provide reference for the protection and restoration of small and micro wetlands in China.
Effect of Graphene Particle Diameter on Mechanical Properties of Graphene Composite MaterialNi, Guanyun
doi: 10.1088/1742-6596/2706/1/012014pmid: N/A
In order to improve the mechanical properties of alloys and broaden their application fields, high-performance metal matric composites have received more and more attention. Graphene has excellent mechanical properties and is often used as a reinforcing phase for various composite materials. However, as the reinforcing phase of the composite, the number, shape, and size of graphene have a significant effect on the overall mechanical properties of the composites. Therefore, the influence of graphene particle diameter on the mechanical properties of graphene particle reinforced metal matrix composites was studied in this paper. By establishing a series of finite element models, we simulated the mechanical behaviour of composite materials under static tension loading. The relationship between graphene particle diameter and material mechanical properties is revealed.
Research Progress in Microbial Degradation of MicroplasticsWang, Qun; Hong, Lei; Wu, Ke; Li, Mengmeng; Zhang, Jie; Li, Xu; Jin, Jie; Liu, Bin
doi: 10.1088/1742-6596/2706/1/012043pmid: N/A
The presence of microplastics is increasingly recognized as a major issue in environmental protection across the world, primarily as a result of their long-lasting nature and the potential harm they can inflict on ecosystems.Current methods for degrading microplastics include physical capture, chemical degradation and biological methods.Among them, microbial degradation has received much attention because it is economically feasible and environmentally friendly.This paper reviews the degrading microorganisms, microbial metabolites and microbial degradation mechanisms of three frequently utilized polymers, namely polyethylene, polystyrene and polyethylene terephthalate, and analyses the current problems of microbial degradation of microplastics, in order to provide ideas for the research on the development of microplastic-degrading enzyme preparations.
Research and Application of the Fourth Generation Stratified Water Injection Technology in Daqing OilfieldSong, XingLiang; Tong, Yin; Jin, Zhendong; ZhenkunZhu, ; Liu, Yuting
doi: 10.1088/1742-6596/2706/1/012079pmid: N/A
Stratified water injection is the most important characteristic technology in Daqing oilfield development, providing technical support for efficient oilfield development. With the oilfield entering the ultra-high water cut stage, the remaining oil is highly dispersed, the oil-water relationship is complex, the qualified rate of water injection decreases rapidly, and the difficulty of stabilizing oil and controlling water is increasing. In order to solve the contradiction between the increasing workload of water injection well testing and the limited testing team, and mee t the needs of oilfield precision development, the cable-controlled layered water injection technology has been developed. In this technology, the pressure monitoring system, flow monitoring system and flow control system are placed in the preset cable intelligent water distributor. At the office end, the technicians send control instructions on the server software, and send them to the ground control box through the oilfield production wireless network. The cable carrier technology is used to transmit the instructions to the intelligent water distributor through the cable, so as to achieve real-time communication, obtain the downhole layering parameter information, and control the downhole layering injection volume. Ten intelligent injection technology demonstration areas have been built to verify the process adaptability under different development contradictions. The cable-controlled layered water injection technology improves the proportion of water absorption thickness, effectively controls the water cut rise rate and natural decline rate, and has obvious oil increase effect, promoting the digital transformation and intelligent development of the oilfield.
Characterization of Fungal Community Composition in the Rhizosphere Soil of Actinidia chinensis Planch Accompanied by Root RotChen, Haisheng; Fang, Fang; Zhang, Jiancheng; Ding, Qihang; Zhao, Yi; Chen, Yanli; He, Yuhao
doi: 10.1088/1742-6596/2706/1/012081pmid: N/A
Nowadays, with the development of Actinidia chinensis Planch cultivation, occurrence of Actinidia chinensis Planch root rot disease have increasingly affected the yield and quality of Actinidia chinensis Planch which caused by many kinds of fungal communities. The aim of this paper is to study fungal community structure in rhizosphere soil of Actinidia chinensis Planch infected and non- infected by root rot disease, and to look for monitoring of Actinidia chinensis Planch root rot disease and green ecological control. The rhizosphere soil samples of Actinidia chinensis Planch infected and non-infected by root rot disease were collected respectively in western mountain areas of Huangyan, Taizhou city, Zhejiang province,China, which is the one of the largest Actinidia chinensis Planch planting regional of Zhejiang province. The fungal community structure of rhizosphere soil of Actinidia chinensis Planch were determined by high throughput sequencing techniques. Compared with non-infected soil, the Chao1 indexes of fungal in rhizosphere soil of Actinidia chinensis Planch infected by root rot disease were decreased with significant level. At phylum level, the relative abundance of some dominant fungal in rhizosphere soil of Actinidia chinensis Planch infected by root rot disease were lower than those of non-infected with significant level(P<0.01), such as Basidiomycota, Fungi-unclassified and Zygomycota, while the relative abundance of Ascomycota in rhizosphere soil of Actinidia chinensis Planch infected by root rot disease were higher than those of non-infected with significant level(P<0.01). At genus level, the relative abundance of some dominant fungal in rhizosphere soil of Actinidia chinensis Planch infected by root rot disease were higher than those of non-infected with significant level, such as Gibberella, Nectria, Fusarium, Pseudogymnoascus and Hypocrea, while the relative abundance of some fungal in rhizosphere soil of Actinidia chinensis Planch infected by root rot disease were lower than those of non-infected with significant level(P<0.01), including Agaricomycetes-unclassified, Cladorrhinum, Trechispora, Ophiocordyceps, Acremonium, Ascobolus and Mortierella. It is conclude that in rhizosphere soils of Actinidia chinensis Planch infected with root rot disease, At the phylum and genus levels, great variations in the abundance of the dominant fungal have been confirmed. Actinidia chinensis Planch root rot disease is closely related to the structure of rhizosphere fungi community, and the changes of the balance and diversity of soil fungi is the major cause of Actinidia chinensis Planch root rot disease. The finding could provide some theoretical reference for controlling Actinidia chinensis Planch root rot disease in Zhejiang Province.
Application Practice for Low Environmental Impact Deep Acidizing Process to Improve Injection Capacity of Water Injection WellsDeng, Xiaoguo; Yan, Yu; Fu, Jie; Li, Heng; Yang, Yang; Cai, Qingqin; Cao, Xiaomei; Dou, Tongwei; Zhao, Junfeng; Jing, Haiquan
doi: 10.1088/1742-6596/2706/1/012085pmid: N/A
There are problems of high injection pressure and water injection difficulties in some injection wells among more than thirty wells that have been injected in H oilfield, and the overall water injection is insufficient. This paper analyzes the reasons for the injection problem from the perspective of block characteristics: for the decline in injection capacity due to reservoir pore blockage caused by clay expansion and contamination by injected impurities, it is proposed to apply a low environmental impact deep acidification system to improve the injection capacity of water wells.