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In this article the method is using UPLC-MS/MS for determination the residues of avermectins in the food plant, avoiding the disadvantages of the UV and fluorescence detectors, and improving the detection limit greatly Materials and methods Instruments, reagents and materials Waters UPLC-TQD (Water Corporation); High-speed Homogenizer; Nitrogen blow instrument (United States Organomation); Centrifuge (Japan-Hitachi); Vortex mixer (Germany IKA); Solid-phase extraction device (HP6019); Electronic balance (FA1104, Shanghai balance instrument factory).
Journal of Chromatography A,918 (2001),p 59 [7] Wei G.Z., Li J.S.
Journal of AOAC International, 84(2001),p 1730 [8] Zhou , H.
Journal of Zhejiang Agricultural Sciences , 5 (2011),p 1134

Materials. 13(2):488 (2020) https://doi.org/10.3390/ma13020488 [3] P.K.
Journal of Materials Processing Technology. 242: 549 - 591 (2017) https://doi.org/10.1016/j.jmatprotec.2016.11.020 [7] G.
Materials, 12(19), (2019), 3136. https://doi.org/10.3390/ma12193136 [10] K.
Carlson.: Joining of dissimilar materials.
Sharifitabar, M.Afarani: Gas tungsten arc welding of CP-copper to 304 stainless steel using different filler materials.

Recently, P(VDF-co-HFP) has received many special attentions as a promising material for polymer electrolytes because of its excellent properties [6-14].
Experimental Materials.
To estimate the compatibility of two materials, a single parameter, the relative energy difference (RED) is calculated from HSP of the two materials according to the following expressions.
A small RED value means a strong interaction or a good compatibility between the two materials.
A new method to determine the partial solubility parameters of polymers from intrinsic viscosity, European Journal of Pharmaceutical Sciences, 2005, 24, 229.

The second part of the analogy has been made available just recently with the introduction of a new concrete material parameter,hygro , and referred to as the coefficient of moisture contraction [1,2].
The material parameters of the patch are taken as:    2 30 / 1.0 1.0 450tan / 400 fTh mm day c KT T mm day c          These analog values represent the actual moisture convective term hfc, a moisture dependent coefficient of diffusivity D(C) and ambient humidity Ce [3].
References [1] Baluch, M.H., Rahman, M.K., Al-Gadhib, A.H. and Raza, A., "Coefficient of Moisture Contraction - A New Concrete Material Parameter", Proceedings of Sustainable Construction Materials, Coventry University, UK, June 2007, pp. 457-460
"Shrinkage-Induced Stresses in Concrete Using a New Concrete Material Parameter", Proceedings of International Conference on Advances in Cement Based Materials and Applications in Civil Infrastructure (ACBM-ACI), Lahore, Pakistan, December, 2007, pp. 411420
Arabian Journal for Science and Engineering.

Then, fine aggregate concrete was applied for pavement materials to cover the parking area in New Mexico and Utah.
Through extensive testing and analysis, preliminary conclusions were drawn, which provide a reference for improving the performance of high-performance eco-permeable concrete.[2] Test Raw materials and performance.
The raw materials used in this test were: Beijing Xingang 42.5 ordinary portland cement, the gravel with particle size of 5~10mm, Zhuozhou river pebbles with particle size of 5~10mm as the coarse aggregate, Langfang river sand as the fine aggregate, naphthalene series superplasticizer as the high efficiency water reducing agent whose water reduction rate is 20%.
References [1] Hongrui Meng, Lihong Chen: Journal of Shanxi University of Technology (Natural Science Edition)Vol. 3 (2010), p. 31-36.
(In Chinese) [2] Peijiang Fu, Yunxing Shi and Tiejun Qu: Concrete Vol. 8 (2009), p. l8-21 (In Chinese) [3] Mingzhen Li, Yunxing Shi and Naiqian Feng: New construction materials(Building Industry Press, China 1998).

Aluminum isopropoxide has already been the important precursor of high-tech materials and functional nanomaterials, and it also has new application in the markets of new luminescent materials and high purity ultrafine Al2O3 powders[2] , etc.
Aluminum isopropoxide is also used as catalyst of the reaction for expoxy compounds polymerize, ester exchange and dehydrating agent, waterproofing agent[3], pharmaceutical raw materials[4], etc.
Experimental Aluminum (Al, 99.996%, from Xinjiang Joinworld), isoproponal (PriOH, AR, from Tianjin Kermel Chemical Reagent) were used as raw materials.
The mixture of the starting materials went through heating, refluxing, evaporating of the dissolvent, and finally aluminum isopropoxide was obtained.
Journal of Rare Earth, 6:20(2002) [3] Shanghai Chemical research and technological achievements, Application technology. (2007)

Introduction Intermetallic matrix composites (IMCs) can be considered to be one of the promising candidate materials for high temperature structural applications due to their high melting point, low density, good environmental stability and excellent oxidation resistance [1].
Moreover, laser cladding can be used to produce small amounts of materials, and it is a powerful tool for the investigation and development of novel alloy systems [4].
Fu: Key Engineering Materials, High-Performance Ceramics IV, (2006) pp.1380-1382 [3] X.Y.
Lett. 22 (2003) pp.369-1372 [4] R.Colaco and R.Vilar: Journal of Laser Applications, Vol. 15(2003) pp. 267-272 [5] T.
West: Materials Science and Technology, Vol. 5(1989), pp. 725-728 [9] J.

Ant colony optimization is a natural way from a moving ant in its path a few left over after a number of pheromones to leave this material in the path of the track.
Acknowledgment This work was supported by the grants from Jiangxi Science and Technology Agency provide financial aid for “an integrated logistics system based on Industrial PDA ” and Key Laboratory of Nuclear Resources and Environment Ministry of Education provide financial aid for “The Research on Dynamic Bayesian Network of Intelligent Information Fusion Mechanism for Muti-Source Spatial Based on Ant Colony Optimization”.
Proceedings of the International Conference on Computer Science and Information Technology, ICCSIT 2008, p 724-728, 2008
European Journal of Operational Research, v 185, n 3, p 1155-1173, March 16, 2008 [4] Ellabib, Issmail; Basir, Otman.A multiple ant colony system with different communication strategies[C].WSEAS Transactions on Information Science and Applications, v 2, n 6, p 663-670, June 2005
An ant colony algorithm with global adaptive optimization[J].Journal of Computational and Theoretical Nanoscience, v 4, n 7-8, p 1283-1289, November/December 2007 [7] Huo, Fengcai; Ren, Weijian; Ran, Ruijun; An improved ant colony algorithm and its application in TSP[C].

In design of this system, several questions should be pay attention to as following: (1) in the design of optical system, lens with greater toughness and material that is able to bear rub should be selected; (2) The disperse angle is related to the focus of concave lens.
“Design of Simple Wireless Communication System”, Journal of North University of China(Natural Science Edition, 2007,(S1) [5] Zheng Jianfeng, Feng Zhenghe.
“A Review of Polarized Antennas for MIMO Wireless Communications”, China Basic Science, 2007,(06) [6] Chu Zheng, Xie Fei.
“Development of UWB”, Telecommunications Science, 2007,(11):18-20 [7] Zhou Jian, Li Binhong.
“Propagation Prediction Model for Indoor Wireless Communications”, Journal of Shanghai Jiaotong University, 1999,(9):29-32

Therefore, the paper investigates a magnetic-gel brake (MGB) based on a novel magnetic function material-magnetic gel (MG) [8].
[4] Yun Dong-won, et al: Society of Mechanical Engineers A, Vol. 33 (2009), p. 34-41 [5] Wei Zhou, et al: Robotica, Vol. 25 (2007), p. 493-500 [6] Tran Hai NAM and K.K.N: Journal of Mechanical Science and Technology, Vol. 23 (2009), p. 1911-1923 [7] J.L.
Viota, et al : Journal of Colloid and Interface Science, Vol. 309 (2007), p. 135-139 [8] J.X.
Wang: Lubrication Engineering, Vol. 6 (1980), p. 35-41 [11] CHENG Guojun: College Physics Course (Science Press, Beijing 2002)