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As for the monitoring of the toxic gas, there are traditional ways that include analysis chemistry, spectral analysis and electrochemistry.
When using the method of the analysis chemistry, usually samples of toxic gas in the scene will be collected, and then taken them back to the laboratory to make a chemical analysis.
Structure of monitoring device and its principle WSN is the new generation of the network [7,8].
Fig. 3 Basic structure of the sensor node Fig. 4 Structure diagram of universal sensor module Sensors, signal conditioning circuits, A/D and D/A conversion circuits, which we are usually applied in WSN, are all integrated in the sensor module.
A structure diagram with universal sensor node is shown in Fig. 4.

Effects of Doping Concentration on the Performance of Blue Fluorescent OLEDs Gang Zhang 1,2,a，Xi-yan Zhang1,b * 1Department of Materials Science and Engineering,Changchun University of Science and Technology,Changchun 130022， China 2Key Laboratory on Functonal Materials Physics and Chemistry of Ministry of Education of China，College of Information Technology,Jilin Normal University,Siping 136000，China azg982@163.com, b*xiyzhang@126.com Keywords: dopant;performance;efficiency;luminance Abstract.
The OLEDs were fabricated with the structure of ITO/m-MTDATA(20nm)/NPB(10nm)/ DPVBi:BCzVBi(15 nm,x%)/TPBi(10 nm)/Alq3(20nm)/Cs2CO3：Ag2O(2nm,20%)/ Al (100 nm) by using the method of fluorescent dyes dopant.
Experimental In this paper，the organic devices were fabricated with the structure of ITO/m-MTDATA (20nm)/ NPB(10nm)/ DPVBi:BCzVBi (15 nm,x%)/ TPBi (10 nm) / Alq3(20nm) / Cs2CO3: Ag2O (2nm, 20%) /Al(100 nm).In this OLED, the DPVBi:BCzVBi works as the blue emitting layer. m-MTDATA serves as hole injection layer.
According to the device structure, each organic layer was evaporated in turn.
Fig.3 The L-V characteristics of the devices Fig.4 The E-V characteristics of the devices Summary The OLED devices were fabricated with the structure of The OLED devices were fabricated with the structure of ITO/m-MTDATA(20nm)/NPB(10nm)/ DPVBi:BCzVBi(15 nm,x%)/TPBi(10 nm)/Alq3 (20nm)/Cs2CO3:Ag2O(2nm, 20%)/ Al(100 nm) by using the method of fluorescent dyes dopant.

Due to their unique properties, auxetic materials have been extensively investigated for load bearing applications including in biomedical engineering and aircraft structures.
Lakes: International Journal of Solids and Structures Vol.39 (2002), p.4825
Evans: Industrial & Engineering Chemistry Research Vol.39 (2000), p.654
Leng: International Journal of Solids and Structures Vol.50 (2013), p.996
Leng: Smart Materials and Structures Vol.22 (2013), art.045005

Preparation of Hierarchical and Ordered Porous Nanostructured Carbons Jiangtao Cai a, Anning Zhou b*, Xiaoyan Li c, Juyan Yan d, Lijuan Wang e , Jinxia Jiangf College of Chemistry & Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China e-mail: a 87237870@qq.com, b* 2631384192@qq.com, c 1017310906@qq.com , d 694762908@qq.com, e785694975@qq.com ,f 857821500@qq.com Keywords: Hierarchical, ordered porous, template agent, nanostructured carbons, phenolic resin Abstract：The hierarchical and ordered porous nanostructured carbons (HOPNCs) have a very wide application in catalysis, adsorption separation, energy storage and other fields.
The results showed that the orderliness of mesoporous carbon materials are significantly enhanced while the ratio of P123/F127 was 1/3,a proper low concentration of template and alcohol solution was helpful to the solvent induced self assembly formed ordered mesoporous structure of nanocarbons.The as-made HOPNCs have large pores of 200 nm or so, mesopores of 8 and 3 nm or so, the pore volume of 0.2527 cm3/g , the BET surface area of 510m2/g. 1.Introduction The porous carbon materials have a very wide range of applications because of their controllable pore structure, excellent thermal stability and chemical stability, and large surface areas[1].
The method has simple synthetic route, less pollution, and the macroporous and mesoporous structure are completely controllable.The study could bring HOPNCs’ preparation technology closer to practical application. 2.Experimental In a typical procedure, 2.44g solid phenol were put into a beaker and completely dissolved under stirring in a water bath at 41-43°C, then 2.6g 20% (wt%) NaOH solution were added.
The structures of as-made HOPNCs have been characterized by using an small angle X-ray diffraction system (XRD; Bruker's D8 Advance X diffractometer with CuKα source), scanning electron microscopy (SEM; JEOL JSM-6460LV & Hitachi S4800  microscope, samples without spraying gold) , transmission electron microscopy (TEM; Hitachi H600 microscope),and Micromeritics ASAP 2020 physical adsorption instrument. 3.Results 3.1 Influence of the templating agent types on mesoporous carbon materials The mesoporous carbon material were obtained from different proportions of triblock copolymer F127 and P123, which small-angle XRD analysis results are shown in Fig.1.
The carbonaceous material prepared in the different assembly methods, such as template agent were assembled with the monomer in situ polymerization, or assembled with the prepolymer, the latter is more conducive to the mesoporous structure orderly formation than the former.

The cluster structure was characterized by single-crystal X-ray diffraction and IR.
The geometric structure of 1 in the solid state was showed in Fig. 1.
Fig.3 The geometric structure of Co core Fig.1 The molecular structure of the complex 1.
Moreover, a new coordinated model toward Ln-M carbonyl cluster was depicted in the structure.
[10] G.M.Sheldrick, SHELXS 97, Program for Crystal Structure Solution; University of Göttingen, Göttingen, Germany, 199.

Physico-chemical processes of hardening of a cement stone are accompanied with shrinkage is known to result in crack formation, loss of concrete structure integrity and finally, to shorter service life.
The introduction into the alkali activated cement of the OPC clinker leads to acceleration of the structure formation process in the cement stone; this conclusion is supported by the lower values of expansion of the cement stone (0.37 mm/m) (compositions Nos 1 and 4).
This may be attributed to the processes of structure formation and densification of the resulted cement stone.
Conclusions The results of the study allowed drawing a conclusion that shrinkage-expansion deformations of the alkali activated slag cement stone could be kept under control through to introduction of the aluminosilicate-, sulfate- and Са- containing additives in order to accelerate the structure formation process of the cement stone and to reduce shrinkage deformations while hardening in water and in the conditions of 65 % relative humidity.
Boldyre (Ed.), Proceedings of Sixth International Congress on the Chemistry of Cement, Vol.

Chemical compositions of egg shells [5] Egg shell as reinforcement in cement Most buildings, bridges, and other structures have been constructed using concrete.
Deepak and Sargunan [6] observed that a solid material mix in solid cement concrete results in a solid structure.
In both samples, portlandite (plate-like form) and CSH (sheet-like structure) are the predominant hydration products.
In OPC (Figure left), a needle-like structure is seen, which suggests the presence of ettringite.
Physics and Chemistry of the Earth 2020, 120: 102951

The structure of WSAL/P-LIG was investigated using TEM (JEOL JEM-2100F).
XRD using a PanAlytical Xpert3 powder model determined the crystal structure of WSAL/P-LIG.
The TEM images in Fig. 3a-b show WSAL/P-LIG possesses a wrinkled sheet-like structure.
The high-resolution TEM (HRTEM) image in Fig.3c shows WSAL/P-LIG has a multilayered structure with a lattice distance of 0.34 nm.
The graphitic structure of WSAL/P-LIG was also demonstrated by XRD (Fig.3d).

The effect of the Mo content on the structure, mechanical and tribological properties of the films is investigated.
Kulebyakin, et al., Mechanical characteristics, structure, and phase stability of tetragonal crystals of zro2–y2o3 solid solutions doped with cerium and neodymium oxides.
Journal of Physics and Chemistry of Solids 150 (2021) 109808 DOI: 10.1016/j.jpcs.2020.109808 [2] V.
Milovich, Mechanical properties and transformation hardening mechanism in yttria, ceria, neodymia and ytterbia co-doped zirconia based solid solutions, Materials Chemistry and Physics 232 (2019) 28-33 DOI: 10.1016/j.matchemphys.2019.04.047 [4] C.
Ma, Crystal structure and tribological properties of molybdenum disulfide films prepared by magnetron sputtering technology, Current Applied Physics, 19(12) (2019) 1318-1324 doi.org/10.1016/j.cap.2019.08.017 [5] W.

These structures can be used for future photovoltaic application of hybrid inorganic nanorod/polymer solar cell.
The schematic diagram of the structure of ZnO nanorod arrays on a nickel-coated PET fiber is shown in the following figure (Figure 1): Fig. 1 Schematic structure of ZnO nanorods grown on Ni-coated PET fiber 2.
Peiro, et al., “Hybrid Polymer/Zinc Oxide Photovoltaic Devices with Vertically Oriented ZnO Nanorods and an Amphiphilic Molecular Interface Layer,” Journal of Physical Chemistry B, vol. 110, pp. 7635-7639, 2005 [10] Wendy U.
Yuhas, et al., “Solution-growth zinc oxide nanowires,” Inorganic Chemistry, vol. 45, pp. 7535-7544, 2006
Farzaneh, “Synthesis of ZnO nanocrystals with hexagonal (Wurtzite) structure in water using microwave irradiation,” Journal of Sciences, vol. 17, pp. 231-234, 2006