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This paper addresses a robust adaptive control system based on Popov hyper-stability theory, which has strong robustness for the particular structure.
Where, (3) The structure of the adaptive control system is constructed as fig.1.
Simulations The structure of the model reference adaptive control system is shown in fig2.
Yang, Robust Adaptive Discrete-time Variable Structure Control of Uncertain Systems.
Computers and Applied Chemistry. (2010) 73-76

The antiphase domain structure in Ni3Al and Al3Ti+Cu intermetallic alloys was recognized by conventional transmission electron microscopy and large angle convergent beam electron diffraction methods.
Conventional TEM studies, LACBED and HRTEM methods were used to elucidate the structure of ordered intermetallics and GaN epilayers.
The antiphase domains structure in various ordered intermetallics with perfect L12 superstructure has been examined.
The usual dislocation core structure can be examined by the weak beam technique, because the core of dislocation is very localized (< 1 nm).
Morniroli: Material Chemistry and Physics 81 (2003) 443-447

Morphology and structure of the products were studied by a Philips xl-30 Operated at 25 kV.
Results and discussion The structure of the particles The position and intense of the peaks due to SnO2 , MgSnO3 , Mg2SnO4 in the XRD pattern of Fig. 1 , Fig. 2 and Fig. 3 respectively at different temperature for 4h with high degree of crystallinity .
Fig. 4, The TG-DTA curves of TNO4 in N2 (g) Then an endothermic peak appear at Mg. 300 ºC, because of decomposition of structure water of Sn(OH)2 together with Mg.0.75% weight loss from 70 to 300 °C..The total weight loss of Mg.7% asgrees will with the calculated result (6%) of realizing H2O from SnO2 .H2O .
A: Chemistry 2000, 132, 1 [7] S.H.
[18] Abdul-Majeed Azad “Synthesis, processing and microstructural characterization of CaSnO3 and SrSnO3 ceramics” Department of Physics ,University Putra Malaysia , 43400 UPM Serdang , Selangor , Malaysia Received 15 July 1998; [19] Feng Li,Jiaqiang,Xianghua Yu,Liying Chen , Jianmin Zhu , Zhengrong Yang Xinquan Xin “ One step solid –state reaction synthesis and gas sensing property of tin oxide nanoparticles” Sensors and Actuators B, 81(2002)165-1 [20] Zhouguang Lu, Junfeng Liu, Yougen Tang, Yadong Li a Department of Chemistry, Key Laboratory of Atomic and Molecular Nanosciences (Ministry of Education, China),” Hydrothermal synthesis of CaSnO3 cubes” Received 15 January 2004; accepted 25 March 2004

Tribological Investigation of Guanidinium Ionic Liquids as Lubricants for Steel/Bronze Contacts Gui-qin Yua, Kuo Yang, Jian-jun Liu and Yong-min Liang College of Chemistry and Engineering, Lanzhou University, Lanzhou, China ayuguiqin@lzu.edu.cn Keywords: Guanidinium ionic liquids, Tribological properties, Steel/bronze contacts Abstract.
In their molecular structure, there are six substituents on three nitrogen atoms, respectively.
This special conjugated structure makes the molecule of guanidinium ionic liquids (GILs) have high thermal stability and good adaptability.
It is probably due to the special conjugate structure of GILs could easily adsorb on the metallic surfaces of the frictional pairs to form an effective boundary film.
[7] Zhou F, Liang Y M, Liu W M: Ionic Liquid Lubricants: Designed Chemistry for Engineering Applications. 38(9) (2009) 2590-2599

The first figure shows the structure of waste generated by types in 2017 according to data from the Central Statistical Office.
Structure of waste generated by types in 2017 according to data from the Central Statistical Office [3].
References [1] Nalewajko M. (2018) Recycling of construction waste as one of the aspects of sustainable construction, the magazine 'Ekonomia i Środowisko' (Economy and Environment), No. 1(64)/2018, 144 – 155 [2] Nalewajko M. (2017) Utilization Certyd type aggregatein building ceramics, 2nd International Conference on Current Research Problems of Materials, Structures, Technologies and Organization of Civil Engineering in Cross-Border Approach, Brest, s. 121-125 [3] https: //stat.gov.pl/obszary-tematyczne/srodowisko-energia/srodowisko/ochrona-srodowiska- 2018,1,19.html [4] Król M., Błaszczyński T.Z., Geopolymeric ecoconcrete, Building materials, nr 11, 2013
[8] Kurdowski W., Cement and concrete chemistry.
[12] Davidovits J., Geopolymer chemistry and applications, 2008 [13] Doležal J., Ńkvára F. i in., Concrete based on fly ash geopolymer, in: Proceedings of Alkali activated materials – research, production and utilization.

Adsorption of Enzyme on Modified Diatomite by Organo-functional Group and Metallic Ions Wei-wei Huan2,a, Mei-juan Tian1,b,*, Zhi-yin Wang2,c and Yu-xiang Yang1,d 1 Department of Chemistry, East China University of Science & Technology, Shanghai 200237, China 2 Zhejiang Provincial Key Laboratory of Chemical Utilization of Foresty Biomass, Zhejiang A& F University, Lin’an, Zhejiang Province, 311300, China ahuanweiwei518@126.com, btianmeijuan_023696@163.com, czlzhiyin@126.com, dyxyang@citiz.net Keywords: Diatomite, Isoelectrlcal point, Modification, Enzyme.
The different pore structure would lead to different surface properties.
The calcination of Jilin-diatomite with CaO induced the Ca diffusing into inner structure of Jilin-diatomite, it made the acid strength of modified Jilin-diatomite increase, and so the amount of adsorptive urokinase was increased (Table 1).
Moreover, the capacity of adsorptive enzyme is also related to pore structure, specific surface of diatomite and protein chain configuration of urokinase itself.
The chemistry of silica: solubility, polimerization, colloid and surface properties, and biochemistry[M].

Development of Titanium-Calcium Alloy Resistant to Aqueous Fluoride Solutions Takumi HARUNA1, a and Itsuki SHINOHARA1 1 Department of Chemistry and Materials Engineering, Kansai University 3-3-35, Yamate-cho, Suita, Osaka 564-8680, JAPAN a haruna@ipcku.kansai-u.ac.jp Keywords: Titanium-calcium alloy, Corrosion, Fluoride solution, Dental material, Implant material.
There were interesting microstructures of the second layer and the inner part; coarse grained structure of about 200 µm thick, and fine acicular (or lamellar) structure, respectively.
The two-layer structure was found in the specimen produced by dipping method.
[11] Handbook of Chemistry - Fundamentals (fifth edition)-, ed. by The Chemical Society of Japan, (Maruzen, Tokyo, 2004) pp.153-155

However, the wrought processing of Mg alloys has limitation due to poor formability coming to its hexagonal closed packed (HCP) structure [1,2,4,6-8].
It has been observed that ductility of the wrought alloys can be increased by proper selection of alloy chemistry.
Addition of Zn in Mg-Sn system shows the higher ductility compared to Mg-Sn alloys, due to refined grain structure by Zn [11].
The XRD pattern reveals the presence of single phase Mg and an intermetallic Mg2Sn phase of cubic structure (F3m3).
Kainer, Materials Chemistry and Physics 136 (2012) 1081-1091

The structure of such composites is illustrated in Fig. 3.
The structure of sintered composite cBN/Ti: (granularity of 4-8 µm, clad by 15% Ti at 7000С, sintered under 3,5 GPa, 17000С, 10 s.), a – without infiltration of Al, b – with infiltration of Al.
Summary The results of the performed study have proven that modification of a surface of refractory powders by means of formation of core-shell structure brings about positive impact when assembling compacts from them applying various methods – both sintering and infiltration with molten metals and microplasma spraying.
Bogdanov, Preparation of coatings on powders by the iodide transport method, Glass Physics and Chemistry, 37(2) (2011) 172-178
Bogdanov, The chemical activity of the coatings obtained by the iodide transport method, Glass Physics and Chemistry, 38 (6) (2012) 750-754

The structure of the dye is shown in Fig. 1. 0.1 N hydrochloric acid and 0.1 N sodium hydroxide solution were used to adjust the pH of the dye solution.
Structure of rhodamine Procedure Immobilization of analytical reagents into a polymeric matrix has been carried out in a static mode.
pH plays an important role in the adsorption capacity by influencing the chemistry of the dye molecule and the PMM in aqueous solution [7].
The similar kinetic profiles obtained for the four concentrations indicate that diffusion within the polymer is a rapid process scarcely influenced by the differences in their chemical structures; this fact is Fig. 4.
Analytical Chemistry. 61 (2006) 216-218