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In the acceleration process, vibration equation can be expressed with variables of time and displacement as Eq. 1: (1) Where, m1 is the weight of the drill string from the jar to surface, E is the elastic modulus of the material, β is the damping coefficient, L1is the length of the drill string from the jar to surface, A1 is the equivalent cross-sectional area of the upper part of drill string as Eq. 2: (2) Linear damping is a commonly used damping model.
According to mechanics of materials, the natural frequency can be expressed through the equations as Eq. 6: (6) The natural frequency and damping vibration frequency can be calculated with the elastic stiffness of the drill string by Eq. 6.
Journal of Petroleum Science and Engineering. 70.3 (2010), p. 235–242
Journal of Vibration and Shock (In Chinese). 30.6 (2011), p. 229-233
Xi'an Petroleum University Journal: Natural Science Edition (In Chinese). 15.1 (2000), p. 39-43

23.11 84.90 3.06 87.96 9.05 97.01 2.99 100.00 15.12 2.40 17.52 77.29 94.81 5.19 100.00 4.35 0.24 4.59 63.73 68.32 31.68 100.00 -0.045mm 100% Iron powder 1 Iron powder 2 Total Tailing 2 Rough concentrate Tailing 1 Roasted ore 47.19 2.99 50.18 36.28 86.46 13.54 100.00 95.98 89.11 95.57 12.83 62.67 11.95 55.80 0.37 0.54 0.38 2.48 1.35 0.61 1.25 1.27 1.77 1.30 29.08 18.61 51.85 23.11 84.78 3.73 88.51 8.59 97.10 2.90 100.00 14.96 1.38 16.34 77.04 93.38 6.62 100.00 3.72 0.33 4.05 65.57 69.62 30.38 100.00 -0.038mm 100% The result reveals that a high quality iron product with the iron grade more than 94% and the recovery approximately 88%,which the content of phosphorus is0.38%,canbe obtained by discarding tailingsbypermanentmagnetseparation,andfinely grinding and deslimingmany times by magnetic media.Judging from the chemical composition of iron powder, it can be used as supplementary for scrap resources,andishigh quality raw materials
A high quality iron product with the iron grade more than 94% and the recovery approximately 88%,which the content of phosphorusis0.38%,obtained by discarding tailingsbypermanent magnetseparation,andfinely grinding and deslimingmany times by magnetic media,whichcan be used as supplementary for scrap resources,andis high quality raw materials of EAF or powder metallurgy.
References [1]Y.M.Zhao,andC.S.Bi:Mineral Deposits, Vol. 19(2000), p. 351 [2] H.M.Zhang,F.L.Wang,andH.Li: Journal of Wuhan Institute ofTechnology,No.3(2011),p. 30 [3] B.C.
China.Patent, Appl.10000815.6.(2004) [6]P.Zhao, and P.M.Guo:Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material,Vol. 15(2008),p. 105 [7]N.S.Srinivasan: Powder Technology,Vol. 124(2002),p. 36 [8] G.S.Liu, S.Vladimir,andA.L.John: Thermal investigations ofdirect iron ore reduction with coal.
Thermochimica Acta . 2004 [9]I.Kobayashi,Y.Tanigaki,andUragami: Iron Steelmaker,No.9(2001),p. 22 [10]PourghahramanP,ForssbergE: International Journal of Mineral Processing,Vol. 82(2007),p. 100

It has almost the highest theoretical capacity which is 1675mAh/g and theoretical energy of 2600Wh/kg among all known cathode materials.
Nuli, Journal of Materials Chemistry, 21 6807-6810
Howe, Chemistry of Materials, 21 (2009) 4724-4730
Yu, Energy & Environmental Science, 4 736-740
Gao, Energy & Environmental Science, 3 1531-1537

Compared to UV detectors made from semiconductor materials, such as Si [3], SiC [4], GaN[5] and AlGaN[6], ZnO based UV detectors [7] have been studied intensively.
However, ZnO materials synthesized by above-mentioned methods are mostly thin films which limit the microminiaturization of ZnO-based devices.
Besides, the response and recovery time of the ZnO materials synthesized by above-mentioned methods are mostly long and the reaction is not sensitive to UV light.
Farrokh-Baroughi, Design, fabrication and characterization of an a-Si:H-based UV detector for sunburn applications, Semiconductor Science and Technology. 21 (2006) 1699-1702
Chakrabarti, ZnO-based interdigitated MSM and MISIM ultravioletphotodetectors, Journal of Physics D: Applied Physics 43 (2010) 415103

., H-1111, Budapest, Hungary 2 Bay Zoltán Institute for Materials Science and Technology Fehérvári út 130., H-1116 Budapest, Hungary 3 Chemical Research Centre, Institute of Chemistry, Hungarian Academy of Sciences Pusztaszeri út 59-67., H-1025 Budapest, Hungary 4 Research Inst. for Technical Physics and Materials Science - MFA P.O.Box. 49, H-1525 Budapest, Hungary Keywords: polycrystalline diamond film, CVD reactor, nucleation, corrosion resistance, mechanical sensor.
Koidl Diamond and Related Materials 3/4-6 (1994) [3] W.
Kimura: Diamond and Related Materials 5 (1996) [7] I.
Pugacz, Muraszkiewicz: Detection of Discontinuities in Passivating Layers on Silicon by NaOH Anisotropic Etch, IBM Journal of Research Development, 1972 September, pp.523-529

Owing to its high conduction, high transparency to the visible light and intense interaction with some gases, In2O3 was widely used in transparent conductive electrode [1], optoelectronic devices such as solar cells, flat panel display materials [2] and gas sensors [3].
Materials and method Preparation of In2O3 film was carried out via a simple chemical vapor deposition (CVD) process.
Liu, Electrochemical performance of In2O3 thin film electrode in lithium cell, Journal of Power Sources 175 (2008) 897-902
Devika, Optical properties of In2O3 films prepared by spray pyrolysis, Materials Chemistry and Physics 100 (2006) 375-379
Li, Preparation of In2O3 nanoparticles and their photocatalysis activity, Electronics Components & Materials 28 (2009) 61-63

Up to now, there are several remediation techniques such as ex-situ(excavation) or in-situ(on-site) soil washing/leaching/ flushing with chemical agents, chemical immobilization/stabilization method to reduce the solubility of heavy metals by adding some non-toxic materials into the soils, electrokinetics(electromigration), covering the original polluted soil surface with clean soils, dilution method (mixing polluted soils with surface and subsurface clean soils to reduce the concentration of heavy metals) and phytoremediation by plants such as woody trees[7,8,9].Considering the removal efficiency of pollutants and recycling,soil washing is particularly frequently used in soil remediation.Which is worked by applying water or aqueous washing solution to the soil to enhance contaminant solubility.
Materials and methods 2.1 Soil characteristics A soil sample, taken at depth from 0 to 20 cm in the Ecological Experimental Station, Shenyang, Liaoning Province of China.
Rocks and other large materials not passing throughthe sieve were removed. 2.2 Contamination Procedure After analyzing to determine its chemical and physical characteristics, the samples were then placed in plastic containers prior to artificial contamination.
Acknowledgements This research was financially supported by the National Natural Science Foundation of China (21277093, 20807029, 21307084), Program for New Century Excellent Talents in University (NCET-13-0910) and the Science and Technology Program of Shenyang City of China (F13-062-2-00).
Clem: submitted to Journal of Materials Research (2003)

The feasibility of composting garden wastes was analyzed, and some related technical processes including the treatment of materials, the adjustment of C/N ratio, and the choice of strains were described.
Composts usually consist of particles of different sizes, but their distribution may vary depending on the feeding materials.
The optimum water content for compost should be at 40%-60%; the adequate C / N ratio for compost is in the range of 25:1-35:1; during composting, pH changes frequently, but the pH of raw materials is close to 7; then it should be add 2-5 kg/m3 of microbial strains and mixed in the good regulation of raw material[7].
The annual output of greening waste and composition of raw materials are mainly affected by season.
[14]Jia L H: Journal of Northeast Agricultural University,vol.36(3)(2005),p.23(In Chinese)

For the fireproof buildings, the fire spreading probability of cell (i, j) is larger because the collapse of buildings lead to the exposure of the combustible materials.
“Investigation on Earthquake Induced Fire Disasters”, Journal of Natural Disasters, Vol. 3, No. 4(1994), p. 39-48(In Chinese) [2] S.J.ZHAO, L.Y.XIONG and A.Z.REN.
“A Spatial-temporal Stochastic Simulation of Fire Outbreaks Following Earthquake Based on GIS”, Journal of Fire Sciences, Vol. 24(2006), p. 313-339 [3] Xuyang Xie, Aizhu Ren.
“Study on Comprehensive Assessment Index System of Urban Fire Risk in Beijing City”, China Safety Science Journal, Vol. 17, No. 4(2007), p.119-124(In Chinese) [10] Lixin Yi.
“Index System Design for Urban Fire Risk Assessment”, Journal of Catastrophology, Vol. 15, No. 4(2000), p. 90-94(In Chinese) [11] Jirou, K., & Kobayashi, K.

Lenard, Metal Forming Science and Practice: A State-of-the-Art Volume in Honour of Professor J.A.
Schey’s 80th Birthday, elsevier science, 2002
Bay, Influence of Workpiece Surface Topography on the Mechanisms of Liquid Lubrication in Strip Drawing, Journal of Tribology 123 (2) (2001) 290
Ahmed, Modeling of Micro-Pit Evolution in Rolling or Strip-Drawing, Journal of Tribology 123 (4) (2001) 791
Salimi, Development of a mixed film lubrication model in cold rolling, Journal of Materials Processing Technology 177 (1-3) (2006) 575–581