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Effect of Flotation Parameters on Recovery of South Africa Nickel Sulphide Ore Ayo Samuel Afolabi1,a, Ambali Saka Abdulkareem2,b and Edison Muzenda3,c 1Department of Civil and Chemical Engineering, College of Science, Engineering and Technology, University of South Africa, P/Bag X6 Florida 1710, Johannesburg, South Africa 2Department of Civil and Chemical Engineering, College of Science, Engineering and Technology, University of South Africa, P/Bag X6 Florida 1710, Johannesburg, South Africa 3Department of Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg South Africa aafolaas@unisa.ac.za, bkasaka2003@yahoo.com, cemuzenda@uj.ac.za, Keywords: Flotation.
Many experimental studies have revealed that the recovery of very fine particles by flotation can be much lower than for the same material in larger sizes [9, 12].
The received pan was placed at the bottom of the sieves to receive the final undersize material.
Journal 24, (2011) 447
Journal 25 (2011) 45 – 56

Synergetics describes the interaction among these subsystems through the exchange of materials, energy or information.
In the report of the 2005 Association for Science and Technology, Academician Yang Xiongli said, transmission of psychological, physiological information delays 0.1～1s, and this delay is different due to the different quality of drivers[6]. 4) As mentioned above, the statistic data of accidents did not contain detailed stake number, only provided the location’s name of the accident.
Beijing: Science Press, 1989. 5-25 [2] LIU Yun-tong.
Testing Technology Journal, 2004, 18 (4):191-194 [4] QIAO Jian-gang, WANG Shu-ling, RONG Jian.
Journal of Beijing University of Technology, 2006, 32 (9):808-811

The test materials of welded hollow sphere, seamless steel tube, cross-board and cover plate are Q235 in the test and the product quality of the hollow sphere shall also comply with what the industry-standard 《Welded joints of space grid structures》[7] (JG11-1999 ) rules.
Acknowledgements This work was financially supported by the National Natural Science Foundation (50678109).
[4] Honggang,lei,Research on Static and Fatigue Behaviour of Welded Hollow Spherical Joints in Space Trusses, Journal of Building Structures, Vol14(1), pp.2-7, February 1993 (In Chinese)
[5] Guobin xu, Jie cui,Fatigue of Space Trusses and Its Fatigue Life Calculation, Journal of Building Structures, Vol15(2), pp.25-34, January1994 (In Chinese)
[6] Chunhua,zeng,Wonderful fatigue phenomenon[M], Science Press ,1986,Peiking, (references) (In Chinese)

The causes analysis and control measures about rapid floor heave in deep mine Sheng Zhang, Zheng Bei, Yi-fei Zhang Henan Polytechnic University, Energy Science and Engineering, Jiaozuo, 454001 82468775@qq.com Keywords: deep mine; rapid floor heave; causes; control measures.
Acknowledgements This work was financially supported by Henan natural science research scheme project based education department（130127）and the coal industry association guiding plan projects（MTKJ2010-354).
Research on Mechanism and Application to Floor Heave Control of Deep Gateway [J].Chinese Journal of Rock Mechanics and Engineering.2009, 28(1):2593-2598
Research on Floor Heave of Roadway in Deep Mining [J].Chinese Journal of Rock Mechanics and Engineering. 2004(7):2396-2401
Simulation of Similar Materials ofFloor Heave Control of Roadway [J].Energy Technology and Management. 2007(6):3-5

Study on Wind Speed Prediction Based on Rbf Neural Network FengWang1,a ZhizhongTan2,b DeyouLiu2,c and XiangdongQian1,d 1Mechanics and Materials College of Hohai University, Nanjing, China 2Hohai University College of Water Resources and Hydropower, Nanjing, China awfnj3089@163.com, b52754862@qq.com, cliudyhhuc@163.com, dlcxy@hhu.edu.cn Keywords: Wind speed prediction, Wind farm, Time series, RBF neural network Abstract: This paper analyzes the importance of the wind farm wind speed prediction, as well as the different forecasting methods in various fields.
Journal of Xi an University of Architecture & Technology (Natural Science Edition). 2007, 39(2), pp.289-292
Progress in Textile Science & Technology. 2007, (3), pp.40-42
Journal of Hydroelectric Engineering. 2007, 26(1), pp.114-118

Research on the framework [7–9] is integrated involving Bochum University of Applied Sciences and Aalto University research groups.
Acknowledgement This research was supported by the Estonian Science Foundation grant no.
Leomar, Universal navigation algorithm planning platform for unmanned systems, in: proc. of International Conference Mechatronic Systems and Materials, 2009, Vilnius, Lithuania
Coatanéa, Conceptual design framework supported by dimensional analysis and system modelling language, Estonian Journal of Engineering 14(4) (2008) 303–316
Coatanea, Study of an exergy method for environmental evaluation assessment in the early design phase using comparative LCA and exergy approach, International Journal of Design Engineering, Inderscience, 2009

In order to simplize analysis, physical mechanics parameters of geotechnical materials are chosen as random variables in this paper, and others are temporarily dealt as definite values.
In order to make it easy to understand, all kinds of geotechnical materials properties can still be thought about as random variables which have no connections with time.
Thus it can be seen, the ignorance of the uncertainty of geotechnical material’s parameters will make a big impact on the computed results of the reliability of landslide, it’s inadvisable and dangerous.
Landslide stability analysis methods are various, which have their advantages and limitations respectively, we should utilize a variety of analysis methods synthetically, based on the principle of system science, using comprehensive integration method, make full use of the existing engineering experience and a variety of theories and methods to make quantitative and qualitative analysis.
[3] R N Chowdhury, Phil Flentje and Gautam Bhattacharya, Geotechnical slope anlysis, Taylor & Francis Goup, CRC Press, London, 2010 [4] J M Duncan, Factors of safety and reliability in geotechnical engineering, Journal of Geotechnical and Geoenvironmental Engineering. 126(2000)307-316

Marine Engineering Steels—Properties Requirements and Evaluation Jian-Xun FUa,*, Le CHENb, Chang-Jin WUc and Yan-Xin WUd,* Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai, China afujianxun@shu.edu.cn, b1551863449@qq.com, cwince@shu.edu.cn, dhinginu@126.com *Corresponding author Keywords: marine engineering steel, corrosion resistance, structural toughness, weldability.
CTOD is the distance between the two surfaces of the gaping when the material body bearing cracking opening load.
CTOD values reflect the size of the resistance of crack tip material to crack.
In the trial, the materials to be test should be processed into samples with pre-existing cracks.
The larger CTOD value is, the better this material can resistance to crack, which means the toughness better.

PEO/Graphene Composites Prepared by a Green Method Lei Hua* Department of Materials Science and Engineering, Tong Ji Zhejiang College, Jinxing, Zhejiang, 314051, China.
Hence, PEO is considered as a suitable medical material for biomedical and biotechnological applications.
The improvement in the degradation temperature of the composites mainly results from the dispersed nanoscaled RG-VC graphene sheets hinder the permeability of volatile decomposition products out from the materials.[8] Moreover, RG-VC graphene sheets also retard the segments mobility of PEO chains resulting in the higher thermal stability.[9] Fig. 4.
Koyyada, Recent progresses and challenges in graphene based nano materials for advanced therapeutical applications: a comprehensive review, Materials Today Communications, 2020(22):100823 [3] M.J.Fernández-Merino, S.Villar-Rodil, J.I.Paredes, P.Solís-Fernández, L.Guardia, A.Martínez-Alonso,J.M.D.Tascón, Identifying efficient natural bioreductants for the preparation of graphene and graphene-metal nanoparticle hybrids with enhanced catalytic activity from graphite oxide.
Silambarasan, Synthesis and characterization of graphene oxide nanosheets, Materials Today: Proceedings, https://doi.org/10.1016/j.matpr.2019.06.375 [6] R.

The needle punched non-woven GT of staple fibers mainly applied to flooring material in waste landfills contain polypropylene and polyester as one of raw materials and it help maintaining stability against acid and alkali materials.
Besides all of these, polypropylene or polyester GTs are used to installation over the HDPE GM in waste landfills and frictional properties between these materials is known to be the cause of decreasing the long-term performance in the geo-synthetics [6-8].
Figure 3 shows again that the value of strength retention is pretty much dependent on the material constructing GT, and the temperature and pHs during service are not major parameters affecting the strength retention in most cases.
Koerner: Durability and Aging of Geosynthetics (Elsevier Applied Science, London/New York 1989)
Jr.Load: ASTM Geotechnical Testing Journal, ASTM (1993), p. 16