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Online since: May 2023
Authors: Grigory Ivanovich Yakovlev, Natalia Kuzmina, Diana Trofimova, Аleksandr F. Buryanov, Ali E.M.M. Elrefaei, Zarina Saidova, Iuliia Ginchitskaia
As can be seen from Figure 9a, when the base is not treated with a primer, the interfacial layer structure is characterized by numerous discontinuities, which decrease the adhesion between the paint and the base.
Hydrogarnets, unlike calcium silicate hydrates, have a dense structure, which increases the strength of the coating.
Therefore, this coating can be used for painting the surface of concrete and cement mortar, steel structures and ceramic substrates.
The use of nano-titanium dioxide as part of a dry mix leads to an improvement in the structure of the hardening composition.
Buzanov // Chemistry, chemical technology and ecology.
Online since: July 2010
Authors: Elena Vigil
We compare results for two structures: a single layer photoelectrode and a double layer photoelectrode.
The thin nanocrystalline TiO2 film in the double structure was obtained using precursor solution based on (NH4)2TiF6 and H3BO3.
III.3 for the four different photoelectrode structures.
A-Chemistry Vol. 159 (2003), p. 33 [22] K.
A: Chemistry Vol. 164 (2004), p. 41 [170] S.
Online since: October 2015
Authors: Júlia Baruque-Ramos, Ivete Maria Cattani
The fibers were tested in order to determine tensile rupture strength, tenacity, elongation, Young’s modulus, cross microscopic structure and regain.
However, examination of cross sections by optical microscopy also is useful to evaluate the integrity of fiber cellular structure and the adequacy of retting time for the extraction of the fibers.
In the case of ultra-retting (when the excessive retting makes the fibers brittle and weak) the damage to cellular structures is visible such as deformation of cell shape or forming large holes [10].
In the present study, the cross microscopies corresponding to the species analyzed showed the full integrity of cell structures.
Yang, Properties and potential applications of natural cellulose fibers from cornhusks, Green Chemistry, v. 7, p. 190-195, 2005.
Online since: July 2015
Authors: Aziman Madun, Mohd Hazreek Zainal Abidin, Mohamad Faizal Tajul Baharuddin, Nor’aishah Md Ali, Saiful Azhar Ahmad Tajudin, Mohd Hafiz Zawawi
In general, the present of this type of rock exhibits geology structures, namely faults, foliations, anticline, syncline, chevron structures, folds and joints.
However, during site investigation, there is no indication of geological structure exposed on the surface.
As reported by [18], the array provides a good vertical resolution and can give a clear image of groundwater and sand-clay boundaries as horizontal structures.
Excessive water seepage can be observed on site which continuously comes out from the slope thru the structure cracking.
Based on resistivity interpretation and water chemistry, the occurrence of groundwater seepage in the studied area was due to the groundwater flow within this area.
Online since: December 2010
Authors: Yuriy S. Nechaev
The authors of [72] noted that for single-wall and graphite samples at 77 K, the indirect values (that follow from their sorption data) of the local surface concentrations of the adsorbate cannot be explained by the known mechanisms of physical monolayer sorption because they substantially exceed the maximum adsorbate concentrations corresponding to the adsorbate monolayer structure commensurate with the graphene structure ((H2/Cs)  0.17) and with the close-packed adsorbate monolayer structure, not related to the graphene structure ((H2/C s)  0.25).
The 1996 Nobel Prize winner in chemistry R.E.
This process probably occurs due to the absence in single-wall nanotube structures (in contrast to activated carbon) of a rigid `frame' that prevents the nanotube bundle structure from disintegrating and/or `swelling' caused by multilayer intercalation and/or condensation of the adsorbate.
Shvartsman, Physical Chemistry, 4th ed., Metallurgiya, Moscow, 1987. 69.
Edie D, The influence of pitch chemistry on particle size and distribution in metal-containing activated carbon fibers.
Online since: October 2013
Authors: Ruo Kang Song, Mai Cang Zhang, Jian Xing Dong, Chen Yang Du
Investigation of Cr34Ni45 ethylene cracking furnace tube in service Ruokang Song 1,a*, Maicang Zhang 1,b, Jianxing Dong1, c, Chenyang Du 2,d, 1 University of Science and Technology Beijing, School of materials Science and Engineering, Beijing 100083, China 2China Special Equipment Inspection and Research Institute, Beijing 100013, China a 947049588@qq.com, b mczhang@ustb.edu.cn, cjxdong@ustb.edu.cn, dchenyangdu@126.com Keywords: Microstructure evolution; Oxidation; Carburization; High temperature service; Abstract: The structure and mechanical property changes of Cr34Ni45 ethylene cracking furnace tube serviced for different time (as-cast, 1.5 years and 6 years) are systematically investigated by using SEM, EMPA, XRD and mechanics performance test methods.
Fig.2b illustrates that the structures of primary carbides have changed after high temperature service.
Fig.2 The carbide structure of different tubes a) sample A; b) sample B; c) sample C Fig.3 Equilibrium phase diagram of 35Cr45Ni heat resistant alloy From the above organization characteristics, it can be concluded that the structure changes of Cr34Ni45 heat resistant steel in service are as follows: The eutectic carbide M7C3 transformed into M23C6 carbide, and accompanied by coarsening; The eutectic carbide NbC transformed into Nb3Ni2Si, which hasn’t completed until six years service, and its shape changed from bone to block; After 1.5years service, secondary M23C6 particles precipitated in the matrix with dispersive distribution, and these particles would dissolve and combine to blocky shape as service time prolonging.
Colás, Materials Chemistry and Physics, 133 (2012) 1018-1023
Online since: May 2013
Authors: Yu Song Xu, Shao Guang Liu, Cheng Wu Chen, He Yong Zhao, Yun Sang Feng
The research reveals sulfate formation as a result of SO3 exposures which does not include changes in the local structure of Cu within the zeolite structure.
The excellent activity connects with the amorphous, pore structure and high specific areas.
Catalysts structure.
Catalysts structure consists of carrier structure and active components.
Journal of Fuel Chemistry and Technology,Vol.38 (2010) No.3, p.343– 351
Online since: August 2021
Authors: Duy Nguyen Phan
[8] El-Nemr, A., et al.: Engineering Structures.
[10] Jia, B., et al.: Asian Journal of Chemistry.
[13] NIIZHB, Concrete structures reinforced with fibre-reinforced polymer bars.
Sigalov: Reinforced concrete structures. 3 ed. 1978, Moscow: Mir
Galic: Materials and Structures.
Online since: July 2024
Authors: Nithia Kumar, Mohamed Hussein, Sarfaraz Kamangar, Muhammad Safwan Mohd Mansor, Irfan Anjum Badruddin
A vehicle structure were spot welded approximately about 3000 to 5000 spot welds [4].
Nowadays, the automotive industry uses robotics to perform RSW on the chassis and structures [5].
The crystal structure for steel alpha phase, Fe-α is body centred cubic (BCC) lattice.
In addition, Titanium exist in two phase crystal structures, alpha and beta phase [14].
Beta phase crystal structure is known to be body centered cubic (BCC) structure [17].
Online since: March 2026
Authors: John Richard Valerio Maghinang, Jeremiah C. Millare
Cellulose Iα exhibits a one-chain triclinic unit cell structure, which is typical of the algal and bacterial cellulose [12].
These peaks are congruent with the crystalline structure of cellulose Iβ.
The structure of natural fibers in a unit cell mainly consists of cellulose, hemicellulose, lignin, pectin, and waxes.
Crystal Structure and Hydrogen-Bonding System in Cellulose Iβ from Synchrotron X-ray and Neutron Fiber Diffraction.
Cellulose Chemistry and Technology, 58(5–6), 561–575. https://doi.org/10.35812/cellulosechemtechnol.2024.58.52 [25] Roy, A., Chakraborty, S., Kundu, S.