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III-N materials have a direct bandgap spanning from 0.7 eV to 6.2 eV and their tunable optical emissions range varies from infrared to ultraviolet, making them suitable for optoelectronic devices.
III-N materials are commonly investigated in light-emitting optoelectronics [2-5].
Development conditions that did not allow high-quality non-doped GaN were not effectively controlled; The GaN materials produced were primarily n-doped, with electron concentrations ranging from 1018 to 1020cm-3.
Richardson, Visible emission from amorphous AlN thin-film phosphors with Cu, Mn, or Cr, Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 19(4) (2001) 1894-1897
Shionoya, Energy transfer processes in Er3+‐and Yb3+‐doped infrared upconversion materials, Journal of applied physics. 78(2) (1995) 1219-1223

This method can be used with other type of carbon steels or other materials if the hardening process is known
Shating, N. and Chuanzhen, H: Materials Science and Engineering A Vol. 452-453 (2007), p. 705
W. and DebRoy, T: Materials Science and Engineering A Vol. 333 (2002), p. 320
Fortunato, A. and Cuccolini, G: Journal of Manufacturing Science and Engineering Vol. 130 (2008), p. 031111
Bonollo: Computational Materials Science Vol. 35 (2006), p. 98

The co-doping of conventional EDFs with rare-earth materials can enhance the pump absorption, which is followed by a non-radiative energy transfer to Er-ions, thereby increasing the maximum output power [2].
Phosphate glass is attractive in several ways that other materials are not compared: (1) it provides larger stimulated emission cross section; (2) high quantum efficiency; (3) it helps increasing rare-earth ions doped conentration, which is the predominant difficulty in convertional silica fiber material; (4) high gain unit length.
The co-doping of conventional EDFs with rare-earth materials (such as Yb3+, Nd3+) can enhance the pump absorption, which is followed by a non-radiative energy transfer from Yb to Er ions via crossrelaxation process [2-6].
Among the fiber matrix materials, phosphate glasses have been proposed as potential host materials for rare-earth co-doped lasers and amplifiers, these glasses are characterized by high solubility, for example the highest doped concentration is 1.2×1027 ions/m3.
Acknowledgements This work was supported by the Science and Technology Department of Jilin Province Natural Science Foundation of China (item number: KYC-JC-XM-2009-012) References [1] Y.

Prajitno, Efrizon Umar Center for Applied Nuclear Science and Technology (PSTNT)-BATAN Jl.
[13] Saleh R., Putra N., Prakoso S.P., Septiadi W.N., (2013), Experimental investigation of thermal conductivity and heat pipe thermal performance of ZnO nanofluids, International Journal of Thermal Sciences 63, pp. 125-132
[16] Syarif, D.G. and Prajitno, D.H., (2013), Characteristics of Water-ZrO2 Nanofluid Made from Solgel Synthesized ZrO2 Nanoparticle Utilizing Local Zircon, Journal of Materials Science and Engineering B 3 (2), pp. 122-127
[18] Rajaeiyan, A., and Bagheri-Mohagheghi, M.M., (2013), Comparison of Urea and Citric Acid Complexing Agents and Annealing Temperature Effect on the Structural Properties of 𝛾- and 𝛼-Alumina Nanoparticles Synthesized by Sol-Gel Method, Advances in Materials Science and Engineering Volume 2013, ArticleID791641, pp. 1-9, http://dx.doi.org/10.1155/2013/791641
[23] Lertpanyapornchai, B., Yokoi, T., Ngamcharussrivichai, C., (2016), Citric acid as complexing agent in synthesis of mesoporous strontium titanate via neutral-templated self-assembly sol-gel combustion method, Mesoporous and Microporous Materials 226, pp.505-509

Materials and methods Materials All the reagents used in the assay procedures were of analytical reagent grade purchased from Sigma-Aldrich and used without further purification.
Yoshimura, Processing and properties of hydroxyapatite-based biomaterials for use as hard tissue replacement implants, Journal of Materials Research 13 (1998) 94-117
Ferrini, Copper and zinc decontamination from single- and binary-metal solutions using hydroxyapatite, Journal of Hazardous Materials 146 (2007) 164-170
Awwad, In-vivo and in-vitro prediction of the efficiency of Nano-Synthesized Material in Removal of Lead Nitrate Toxicity, Journal of American Science 7 (2011) 105-119
Costache, Characteristics of hydroxyapatite thin ilms, Journal of Optoelectronics and Advanced Materials 9 (2007) 3827–3831

Later it was used as filter material in oilfields.
Table2 The cleaning formula of regenerant Materials NaOH Na2SiO·（9H2O） Na5P3O10 Na2CO3 OP-10 HO(CH2CH20)nH H2O LAS Mass(g) 4.5 6.5 2.0 3.5 6.5 25 75 1 The concentration and temperature of regenerant and the amount of LAS Fig.1The relationship of detergent concentration Fig.2.
Rahman: Journal of Petroleum Science and Engineering. 7(1992), P.244
（In Chinese） [6] Palladino, P, Rossi, F and Ragone, R: Journal of Fluorescence. 20(2010), P. 191
L, Elistratova, J, Soloveva, S, Garusov, A, Antipin, I and Konovalov, A:Journal of Colloid and Interface Science. 346(2010), P.405

There is also another innovative method that involves using phase-change materials (PCMs) to remove heat from PV panels.
Thermal Management Improvement in Photovoltaic Cells using Phase Change Materials.
Materials and Methods Physical Model Description and Specifications.
Gendeshmin, “Improvement of photocells by the integration of phase change materials and thermoelectric generators (PV-PCM-TEG) and study on the ability to generate electricity around the clock,” Journal of Energy Storage, vol. 36, Apr. 2021
Hegedus, Handbook of photovoltaic science and engineering.

Morkoç, Microwave ferrites, part 1: fundamental properties, Journal of Materials Science: Materials in Electronics 20 (9) (2009) 789-834
Morkoç, Microwave ferrites, part 2: passive components and electrical tuning, Journal of Materials Science: Materials in Electronics 20 (10) (2009) 911-952
Sombra, Magnetic and dielectric properties of the M-type barium strontium hexaferrite (BaxSr1−xFe12O19) in the RF and microwave (MW) frequency range, Journal of Materials Science: Materials in Electronics 20 (5) (2009) 408-417
Bate, Magnetic recording materials since 1975, Journal of Magnetism and Magnetic materials 100 (1) (1991) 413-424
Ponton, Magnetic properties of hydrothermally synthesized strontium hexaferrite as a function of synthesis conditions, Journal of materials science 30 (6) (1995) 1429-1433

This paper shows the effect of sustainable copper fibres on some properties of perlite structural lightweight concrete containing sustainable materials.
The materials used to cast the specimen are ordinary Portland cement, local ash, metakaolin, combined coarse and fine perlite aggregate, and super-plasticizer.
Experimental Work Materials.
Vrcelj, “Current sustainable trends of using waste materials in concrete—a decade review,” Sustainability (Switzerland), vol. 12, no. 22.
Nugraha, “High strength lightweight concrete with expandable perlite as the aggregate,” in IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing, May 2020. doi: 10.1088/1757-899X/830/4/042040

The Day-and-night Solar Lighting System Xiuxia Zhang , Xiuli Lou, Junxia Wen1, Daojie Jiang, ChaohuiLi Key words: light-absorpting shade; optical fiber materials; long persistent luminescent phosphor materials Abstract: In this paper, a novel light-absorpting shade and optical fiber and long persistent luminescent phosphor materials provided a safe and reliable day-and-night solar lighting system.
(4) Long persistent luminescent Phosphor materials: lighting for night.
Progress in Research on Long Af terglow Phosphorescent Materials[N] Materials Review, 2007, 8(21): 106-115 [4] Fan Wang, Wei ding Long.
Advances in Long Lasting Phosphorencent Materials[N]Chinese Journal Of Inorganic Chemistry 2009, 8(25)1324-1329
Progress on Long Persistence Luminescent Materials [] Rare Metal Materials And Engineering, 2008,2(37):108-194 [10] ke Liu ,j i a shengBao.