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Development of New Fire Extinguishing Agent for Grassland Leng Ningbo1, a, Wang Shunxi1, b, Han Pei1, c 1School of Engineering, China Agricultural University, Beijing 100083, China alengnb722@163.com, bwsx68@cau.edu.cn, cpeipeinihao@163.com Key words：grassland fire；ammonium phosphate；extinguishing effectiveness Abstract.
In this paper, developed a new type of extinguishing agent for grassland fire, which based on ammonium phosphate, ammonium dihydrogen phosphate powder extinguishing agent after the treatment of the ultrafine , the particle size become smaller and the surface area increased significantly, surface activity increased that the fire extinguishing efficiency would be greatly enhanced [3-5] ,the new grassland fire extinguishing agent not only has these advantages, but also environmentally friendly, high extinguishing efficiency, relatively low cost. 1 实Experiment 1.1 实验原料Experimental Materials 磷酸二氢铵、云母粉、滑石粉、白炭黑，活性白土均为工业品、 ND1 （含碳酸盐的一种化合Ammonium dihydrogen phosphate, mica, talc, white carbon black, activated clay, ND1 (a compound of contain carbonate).
②添加 ND1 配制灭火剂成品 add ND1 to finishing the preparation of the extinguishing agent product A ：取配制好的灭火剂基料和粉碎后的 ND1 ，将粉碎后的 ND1 按照 15 ％、 25 ％、 35 ％、 45 ％的质量百分比与灭火剂基料混合，在干燥箱中烘干至含水率小于 2% ； A: Take the extinguishing agent base material and the crushed ND1 ,the crushed ND1 in accordance with 15%, 25%, 35%, 45% of the mass percentage mixed with extinguishing agent base material, dried in the drying oven to a moisture content of less than 2%.
test results 灭火剂基料的性能测试如表 4 和图 1 、图 2 、图 3 、图 4 所示，Performances testing of fire extinguishing agent base material are shown in Table 4 and Fig.1, Fig. 2, Fig.3, Fig.4 表 4 灭Table4 Extinguishing agent base performance Table 4 Extinguishing agent base performance 性能指标 Performance indicators 测试结果 Test results 平均粒径 Average particle size 2.5um 2.5um 吸湿率 Moisture absorption rate 10% 10% 斥水性 Hydrophobic 水面漂浮 48 小时没有吸水结块 Floating 48 hours absorbent agglomeration 松密度 Bulk Density 0.8045g/cm 3 0.8045g/cm 3 流动性（休止角） Mobility (angle of repose) 33.7 ° 33.7 ° 抗结块性 Anti-caking 良好的流沙状 Quicksand-like Fig. 1 Fire extinguishing agent binder apparent characteristics Fig. 1 Fire extinguishing agent the binder apparent characteristics 图 2 灭火剂基料 400 倍显微镜下形Fig. 2 Fire extinguishing agent base material 400 times morphology under light microscopFig. 2 Fire extinguishing agent base material 400 times morphology under light microscopy 图 3 灭火剂基料休止角 33.7 °Fig. 3 Fire extinguishing agent binder repose angle
of 33.7 °Fig. 3 Fire extinguishing agent the binder repose of the angle of 33.7 ° 图 4 灭火剂基料斥水性Fig. 4 Fire extinguishing agent base material water repellency quaFig. 4 Fire extinguishing agent base material water repellency qualified 2.2草原灭火剂成品性能测Performance testing of grassland fire extinguishing agent product 通过对配制的灭火剂成品进行一系列表征指标的测试，结果可见表 5 所示：Through a series of characteristic index test, the results can be seen in Table 5: 表 5 灭火剂 Table5 Extinguishing agent perTable 5 Extinguishing agent performance 性能表征 Characterization ND1 添加质量百分比 The ND1 add mass percentage 0 0 15 ％ 15% 25 ％ 25% 35 ％ 35% 45 ％ 45% 粒径（ um ） Particle size (um) 2.5 2.5 2.68 2.68 2.50 2.50 2.15 2.15 2.32 2.32 吸湿率 (%) Absorption rate (%) 10% 10% 2.35 2.35 2.8 2.8 1.98 1.98 1.54 1.54 斥水性 Hydrophobic 合格 Qualified 合格 Qualified 合格 Qualified 合格 Qualified 合格 Qualified 松密度 (g/cm 3 ) Bulk density (g / cm 3) 0.8045 0.8045 0.8135 0.8135 0.8410 0.8410 0.8550 0.8550 0.9265 0.9265 流动性（休止角°） Flow (angle of repose°) 33.7 33.7

Introduction Pulsed laser ablation is the technique of eliminating solid or liquid materials through direct exposure to one or more continuous laser pulses [1].
Hence, the utilization of nanotechnology across many scientific disciplines is a significant instrument for achieving optimal applications and investigations in physics, biology, chemistry, and engineering, specifically at the atomic and molecular scales [27,28].
Conclusions Metal oxides have distinctive characteristics that set them apart from other solid materials due to their composition and synthetic nanostructures.
Pirzadah, “Chapter 3-Synthesis methods of nanoparticles and their key applications,” in Micro and Nano Technologies, M.
Borman, “22 - Laser-initiated ablation of materials,” in Woodhead Publishing Series in Electronic and Optical Materials, J.

The main contents include curriculum orientation, curriculum objectives, syllabus, curriculum teaching contents and requirements, curriculum videos, arrangement of practical links, assessment plans, teaching materials, materials and other sections.
It breaks the traditional teaching mode of centering on teaching materials and teachers.
Textbooks are of course important, but for the subject of national law, it is difficult for students to accurately grasp the deep legal principles behind the words only by relying on teaching materials and teachers' explanations.
Through various ways of pictures, audio and video, students can efficiently master and understand the key parts of knowledge.
Electronic Technology and Software Engineering, 2020(05):135-136.

Effects of Ce Addition on Solidification Structure of a Low-Carbon 42CrMo4 Steel Vu The Ha1,a*, Jaromir Drapala2,b, Silvie Brožová2,c, Michal Madaj2,d, Pavel Machovčák3,e, Petr Jonšta3,f 1Hạ Long University, Environmental Faculty, No 258, Bạch Đằng street, Nam Khê district, Uông Bí city, Quảng Ninh province, Việt Nam 2VSB-Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Center of Advanced Innovation Technologies, Av. 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic 3Vítkovice Heavy Machinery a.s., Ruská 2887/101, Vítkovice, 703 00 Ostrava, Czech Republic 1.avutheha6@gmail.com, 2,bjaromir.drapala@vsb.cz, 2,csilvie.brozova@vsb.cz, 2,dmichal.madaj@vsb.cz, 3,epavel.machovcak@vitkovice.cz, 3,fpetr.jonsta@vitkovice.cz Keywords: Cerium, inclusions, solidification structure, grains, dendrite Abstract: Effects of Cerium (Ce) addition on solidification structure of a low-carbon 42CrMo4 steel was investigated.
Such solidification structure is always associated with a so called macrosegregation phenomenon which is essentially a deviation of alloying concentration from the average nominal composition of the materials over distances much larger in comparison with the dendrite arm spacing [1, 2].
Charge material consisted of small pieces cut off from the steel bar and Ce in the form of mixture of powder was added to the charge prior to melting in case of 42CrMo4Ce steel.
LO1203: “Regional Materials Science and Technology Centre – Feasibility Programs” and project No.
The authors wish also to express sincere thanks to the Department of Metallurgy and Materials Science of the Technical University of Ostrava for providing facilities and favorable environment for carrying out this study.

The anode and cathode are materials into which, and from which, lithium can migrate.
While the first part of the production chain consists primarily of chemical engineering processes, the cell assembly is very heterogeneous, depending on the chosen cell type.
Technologies for handling of non-stable materials, finally, can be transferred from e.g. textiles.
The material level is dominated by chemical process engineering.
[17] Li, J.; Daniel, C.; Wood, D.: Materials processing for lithium-ion batteries.

The plan of tension sensor The sectional drawing of tension sensor 1-cylindrical elastic body 2- resistance strain gage 3- shell 4- connecting line 5- tightening screw 6- silica-gel 7- outlet 8- centre bore Figure 2 Tension sensor structure 1.2 Secondary measuring instrument Secondary measuring instrument includes breadboard, screen, function key, and power, etc, and its core function module consists of CPU, memorizer, display chip, special clock chip, radio frequency chip, and peripheral circuit, which can directly display the displacement, store data in real time, and realize the wireless data transmission.
Figure 4 The tension monitoring instrument of Bolt and Cable in multi-points During the monitoring, appropriative wireless data acquisition device will be used regularly to collect data, forming the stress change curve of bolt and cable through simple processing. 2.2 Application condition The shell of automatic monitor of bolt and cable adopts ABS fire-proof material which has high strength, good sealing and environmental adaptability, ensuring the safety of the use in high gas mine.
Mechanism study on strength enhancement for the rocks surrounding roadway supported by bolt [J].Chinese Journal of Rock Mechanics and Engineering, 2000, 03: 342-345
Principle and engineering application of sensor [M].

Weaving Process Scheduling Method Based On ant colony algorithm Hualin Yang1,a, Hairan Wang1,b 1College of Electromechanical Engineering,Qingdao University of Science & Technology, Qingdao, 266061, China ayounghualin@163.com, bwanghairan1122@126.com Key words: MTO, ACO, Knitting Process Scheduling, Complex Working Conditions Abstract.
Prior to the scheduling, ministry of planning convert the specifications and quantity of the product to weaving length, estimate the amount of the yarn and other material needed, and calculate the output based on this.
References [1] Dorigo M,Maniezzo V: IEE Trans on System, Man, and Cybernetics, Vol.26(1996), p.29 [2] Colorni A,Dorigo M,Maniezzo V: Belgian Journal of Operations Research Statistics and Computer Science, Vol.34(1994),p.39 [3] Dorigo M, Stutzle T: Ant Colony Optimization (MIT Press, USA 2004) [4] Liang, Guo Bo: Systems Engineering Theory and Practice, Vol.29 (2009), p.118 [5] Duan Haibin:Principle of Ant Colony Algorithm and its Application.

Symbol can be seen as the "material carriers of information society", which is responsible for carrying and transferring information.
Whether this is a key or a pattern can be clicked?
From the user aspect, flat design combining with ergonomics, usability engineering, synthetic vision, layout, interaction and operation makes user experience natural and efficient.
Analysis of the Artistic Expression Characteristicsof Web Page Navigation Design [J].Packaging Engineering，2009.30 (4):177—178．

The types of plants growing in contaminated area influence the amount, diversity, and activity of microbial populations[12,13]. 2.3 Rhizofiltration Rhizofiltration removes contaminants from water and aqueous waste streams, such as agricultural runoff, industrial discharges, and nuclear material processing wastes[14].
Absorption and adsorption by plant roots play a key role in this technique, and consequently large root surface areas are usually required.
For this reason, phytoextraction is linked with genetic engineering and advanced agricultural practices.
Existing plantscould also be improved, through the use of conventionalbreeding techniques, and genetic engineering approaches.

Ozone: Science & Engineering, 28, 415–423
Chemistry of Materials, 7, 663-671
Material Science and Engineering: B, 56, 211-216
Chemical Engineering Science, 57, 4895–4907
Chemical Engineering Journal, 169,126–134