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Online since: July 2014
Authors: Jian Zhang, Qing Yang Wang, Jian Xing Ren, Tian Yu Sun
Conclusions
The structure of the energy consumption of China is mainly dominated by coal, fossil energy accounted for 92.7% of overall energy structure.
Facing the situation of resource constraint tightens and serious environmental pollution, the transformation of the mode of development, optimizing the energy structure and adjustment of industrial structure is the only way to reduce the frequence of fog haze weather[11].
Atmospheric Chemistry and Physics,2009,9(19):7519-7530 [11] Wang Xin,He Qian.The haze weather induced reflection[J].
Facing the situation of resource constraint tightens and serious environmental pollution, the transformation of the mode of development, optimizing the energy structure and adjustment of industrial structure is the only way to reduce the frequence of fog haze weather[11].
Atmospheric Chemistry and Physics,2009,9(19):7519-7530 [11] Wang Xin,He Qian.The haze weather induced reflection[J].
Online since: January 2007
Authors: Choung Lii Chao, Kung Jeng Ma, Hsi Hsin Chien
The appearance of a columnar and
layered structure disappears near the centre of the wear tracks after 50 N x 520 cycles traverses, as
shown in Fig. 6(c)).
It is believed that the carbide phases precipitated in amorphous carbon may stabilise the structure and decrease the residual stress in a-C/ a-C:Cr multilayer coatings.
An amorphous structure of alternated a-C/a-C:Cr multilayers may have the function for energy absorption and stress dispersionr.
Gilman, "The Strength of Ceramic Crystals", The Physics and Chemistry of Ceramics, Klingsberg, C.
Cross-sectional SEM image of a-C/a-C:Cr multilayer coatings, showing dense columnar structure.
It is believed that the carbide phases precipitated in amorphous carbon may stabilise the structure and decrease the residual stress in a-C/ a-C:Cr multilayer coatings.
An amorphous structure of alternated a-C/a-C:Cr multilayers may have the function for energy absorption and stress dispersionr.
Gilman, "The Strength of Ceramic Crystals", The Physics and Chemistry of Ceramics, Klingsberg, C.
Cross-sectional SEM image of a-C/a-C:Cr multilayer coatings, showing dense columnar structure.
Online since: January 2017
Authors: Qian Zhang, Dong Yan, Jian Pu, Zhe Li
Fig. 1 The schematic diagram of the specimen for contact ASR measurement of SUS430/LCN/SUSU430 setup
Fig. 2 Testing device for contact ASR measurement
X-ray diffractometer (XRD, PANalytical, X'Pert PRO) was used to identify the crystal structure of the calcined powder; and field emission scanning electron microscope (FSEM, Sirion 200, FEI Corporation, Holland) was utilized to examine the powder morphology before and after ASR test.
Meanwhile, the porous structure could ensure that gas flow smoothly at the cathode side.
It is obviously found that larger particle size and better three dimensional structure are obtained compared with the particle before the test.
In Fig. 7b, a layer of oxidant can be easily found where Cr/Mn aggregate and present multi-layered structure in which MnO2 on the top, Mn-Cr spinel in the middle, Cr2O3 at the bottom [18, 19].
Poulsen, Defect chemistry modeling of oxygen-stoichiometry, vacancy concentrations and conductivity of (La1-xSrx)yMnO3±δ, Solid State Ionics 129 (2000) 145-162
Meanwhile, the porous structure could ensure that gas flow smoothly at the cathode side.
It is obviously found that larger particle size and better three dimensional structure are obtained compared with the particle before the test.
In Fig. 7b, a layer of oxidant can be easily found where Cr/Mn aggregate and present multi-layered structure in which MnO2 on the top, Mn-Cr spinel in the middle, Cr2O3 at the bottom [18, 19].
Poulsen, Defect chemistry modeling of oxygen-stoichiometry, vacancy concentrations and conductivity of (La1-xSrx)yMnO3±δ, Solid State Ionics 129 (2000) 145-162
Online since: May 2013
Authors: Fu Liang Zhu, Yan Shuang Meng
The XRD data agree totally with tetragonal rutile crystal structure of SnO2.
It indicates that the increasing Sb3+ doped concentrations have no effect on the transformation of lattice structure of SnO2.
The polycrystalline structure of ATO nano-particle is proved by Electron diffraction.
XRD results indicate that ATO has a rutile crystal structure of SnO2.
Materials Chemistry and Physics.
It indicates that the increasing Sb3+ doped concentrations have no effect on the transformation of lattice structure of SnO2.
The polycrystalline structure of ATO nano-particle is proved by Electron diffraction.
XRD results indicate that ATO has a rutile crystal structure of SnO2.
Materials Chemistry and Physics.
Online since: February 2014
Authors: Evi Nurliana, Lita Rahmasari, Riyatun Riyatun
This increase indicated that increasing of polarization value caused by the ion that resulted from the increase of size the cation which move into the glass structure.
Research that has been done by Eraiah.[2] also showed the addition of rare earth ions (Sm3+) to zinc-tellurite glass is generally increased the molar refraction.This increase was caused by the insertion of Nd3+ ions in the glass network structure TZBN.
Nd3+ ions has radius are (1.123 Å) [1] which is smaller than the radius of the atom tellurite (1.60 Å) [12], so it is possible for Nd3+ions to insert in the glass network structure TZBN.
The increase in size of the cation by Nd3+ ion insertion into the glass structure to raise the value of the polarization of the glass. increase the value of this polarization will increase the refractive index of the glass.
Abbas Ahmed, New tellurite glass: Optical properties, Materials Chemistry and Physics.109 (2008) 291-296
Research that has been done by Eraiah.[2] also showed the addition of rare earth ions (Sm3+) to zinc-tellurite glass is generally increased the molar refraction.This increase was caused by the insertion of Nd3+ ions in the glass network structure TZBN.
Nd3+ ions has radius are (1.123 Å) [1] which is smaller than the radius of the atom tellurite (1.60 Å) [12], so it is possible for Nd3+ions to insert in the glass network structure TZBN.
The increase in size of the cation by Nd3+ ion insertion into the glass structure to raise the value of the polarization of the glass. increase the value of this polarization will increase the refractive index of the glass.
Abbas Ahmed, New tellurite glass: Optical properties, Materials Chemistry and Physics.109 (2008) 291-296
Online since: May 2014
Authors: Fu Xing Chen, Xu Sheng Xie
Because crossover and mutation probability remains one kinds of probability in the search process of the genetic algorithm, the higher crossover probability set ,the greater the likelihood of being destroyed of genetic algorithms model, making the individual structure with a high degree of adaptation will soon be destroyed; but if we set the crossover probability too small, it will make the search process slow, even stagnant.
When the mutation probability is set too small, it is unlikely to produce new individual structures; If the mutation probability is set too large, then the genetic algorithm becomes a pure random search algorithm.
Clustering is a kind of technique discovering this internal structure.
We set individuals on the level of "good" with smaller crossover and mutation probability to reduce the possibility of disrupting optimal genes; set individuals on the level of "moderate" with bigger crossover and mutation probability than "good" individuals; set larger crossover and mutation probability for "poor" individuals to improve the ability to produce new individual structures.
Experiment In order to compare the performance of traditional genetic algorithm and improved genetic algorithm, the experiment database uses oracle 10G Enterprise Edition, java as development language with distributed database environment in the LAN.Experimental data use college course management data, namely student information, English scores information, mathematics scores information, Chinese scores information, physics scores information and chemistry scores information, corresponding to the six relational data tables: student, yingyu_grade, shuxue_grade, yuwen_grade, wuli_grade, huaxue_grade respectively.
When the mutation probability is set too small, it is unlikely to produce new individual structures; If the mutation probability is set too large, then the genetic algorithm becomes a pure random search algorithm.
Clustering is a kind of technique discovering this internal structure.
We set individuals on the level of "good" with smaller crossover and mutation probability to reduce the possibility of disrupting optimal genes; set individuals on the level of "moderate" with bigger crossover and mutation probability than "good" individuals; set larger crossover and mutation probability for "poor" individuals to improve the ability to produce new individual structures.
Experiment In order to compare the performance of traditional genetic algorithm and improved genetic algorithm, the experiment database uses oracle 10G Enterprise Edition, java as development language with distributed database environment in the LAN.Experimental data use college course management data, namely student information, English scores information, mathematics scores information, Chinese scores information, physics scores information and chemistry scores information, corresponding to the six relational data tables: student, yingyu_grade, shuxue_grade, yuwen_grade, wuli_grade, huaxue_grade respectively.
Online since: June 2010
Authors: Ming Hui Guo, Yong Wang, Fang Yan Liu
These basic structure compose racemic
pinoresinol, phydroxy guaiacyl glycerol-based alcohol ether-β-Pine Park etc. and also some body
structures, meanwhile the lignin can have reaction with arabinofuranosyl-based, xylopyranosyl to
form carbohydrate complex.
Then the lignin condenses with furyl hydroxymethyl-urea to form High Molecular Weight three dimensional structure polymer and it can also have cross linking in the process for it has more than two active hydroxyls, which is similar to the reaction process of phenolic resin .but the steric hindrance of phenolic structure is greater than urea so the main reaction is similar to the reaction process of urea-formaldehyde resin while the side reaction is similar to the reaction process of phenolic resin.
Pizzi: European Journal of Wood and Wood Products Vol. 65 (2007), p. 65-70 [3] Nimz H: Wood Adhesives: Chemistry and Technology Vol. 1(1983), p.34-37 [4] Lewis NG, Lantzy TR: Lignin in adhesives.
Then the lignin condenses with furyl hydroxymethyl-urea to form High Molecular Weight three dimensional structure polymer and it can also have cross linking in the process for it has more than two active hydroxyls, which is similar to the reaction process of phenolic resin .but the steric hindrance of phenolic structure is greater than urea so the main reaction is similar to the reaction process of urea-formaldehyde resin while the side reaction is similar to the reaction process of phenolic resin.
Pizzi: European Journal of Wood and Wood Products Vol. 65 (2007), p. 65-70 [3] Nimz H: Wood Adhesives: Chemistry and Technology Vol. 1(1983), p.34-37 [4] Lewis NG, Lantzy TR: Lignin in adhesives.
Online since: July 2019
Authors: Ai Xia Chen, Rui Hua Wang, Shi Bin Li, Fang Wang, Chao Yang, Xue Qing Yang, Jie Guang Song, Min Han Xu
Effect of High Temperature Process on Microstructure and Properties of Industrial Steel Slag Cement
Fang Wang1, Minghan Xu1, Ruihua Wang1, Chao Yang1, Aixia Chen1,
Shibin Li1, Jieguang Song2a, Xueqing Yang3b
1School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China
2Research Institute of Sponge City, Pingxiang University, Pingxiang 337055 China
3Key Laboratory for Industrial Ceramics of Jiangxi Province, School of Materials and Chemistry Engineering, Pingxiang University, Pingxiang 337055 China
asjg825@163.com, b787264278@qq.com
Keywords: Cement; Industrial steel slag; microstructure; high temperature process.
(a) 1000 ℃ (b) 1100 ℃ (c) 1200℃ Fig.1 Macroscopic structure of cement concrete with different sintering temperatures Tab.2 Density and particle size of cement concrete at different sintering temperatures Temperatures(℃) 1000 1100 1200 Density(g/cm3) 2.1918 2.1573 2.5845 Particle size (D50) 14.5um 19.0um 22.6um The microstructure comparison chart is shown in Fig.2.
The flexural properties of cement, but (a) (c) distribution is relatively uniform and orderly, In particular, a sheet-like structure is produced, which is equivalent to the addition of a reinforcing phase inside the material, and has a good reinforcing effect on the mechanical properties of the material, which is more conducive to enhancing cement performance [12-14].
This is because the longer the holding time, the better the degree of cement sintering, the better the structure and chemical properties of the cement, and the better the hydration activity of the cement.
In the same comparison, it is obvious that the density of the experimental group is the highest when the temperature is kept for 2 hours, so the structure of the concrete is relatively evenly arranged and the compression resistance is better in this condition.
(a) 1000 ℃ (b) 1100 ℃ (c) 1200℃ Fig.1 Macroscopic structure of cement concrete with different sintering temperatures Tab.2 Density and particle size of cement concrete at different sintering temperatures Temperatures(℃) 1000 1100 1200 Density(g/cm3) 2.1918 2.1573 2.5845 Particle size (D50) 14.5um 19.0um 22.6um The microstructure comparison chart is shown in Fig.2.
The flexural properties of cement, but (a) (c) distribution is relatively uniform and orderly, In particular, a sheet-like structure is produced, which is equivalent to the addition of a reinforcing phase inside the material, and has a good reinforcing effect on the mechanical properties of the material, which is more conducive to enhancing cement performance [12-14].
This is because the longer the holding time, the better the degree of cement sintering, the better the structure and chemical properties of the cement, and the better the hydration activity of the cement.
In the same comparison, it is obvious that the density of the experimental group is the highest when the temperature is kept for 2 hours, so the structure of the concrete is relatively evenly arranged and the compression resistance is better in this condition.
Online since: July 2017
Authors: Sakdiphon Thiensem, Rungsarit Koonawoot, Sittiporn Punyanitya, Anirut Raksujarit, Watchara Sontichai, Anucha Ruksanti
In Vivo Clinical Trial of Porous Starch-Hydroxyapatite Composite Biomaterials for Bone Regeneration
Sittiporn Punyanitya1, a*, Rungsarit Koonawoot1, b, Anucha Ruksanti2, c,
Sakdiphon Thiensem3, d, Anirut Raksujarit4, e and Watchara Sontichai5, f
1Punyanitya Medical Instrument,
19/44, Singharaj Road, Tumbol Sriphum, Aumphur Muangchiangmai, 50200, Thailand
2Biomedical Materials and Ceramic Industrial Research Unit, Chiang Mai University,
Chiang Mai, 50200, Thailand
3Department of Industrial Chemistry, Faculty of Science, Chiang Mai University,
Chiang Mai, 50200, Thailand
4Department of Science, Faculty of Science and Technology, Chiang Mai Rajabhat University,
Chiang Mai, 50300, Thailand
5Hariphunchai Memorial Hospital, Lamphun, 51000, Thailand
apunyanitya.s@gmail.com, bkoonawoot@yahoo.com, canucha_ist@hotmail.com, dsukdipown@hotmail.com, earaksujarit@gmail.com, fharihospital@hotmail.com
Keywords: Rice starch, Porous composite, Biomaterial, Bone regeneration, Clinical trial
The living bone structure is a natural nanocomposites material formed by an organic collagenous matrix and inorganic salts ((HA) crystals).
Bone void filler is bone graft substitute intended for hard tissue surgical applications, including orthopedic, neurosurgery and dentistry and others, as a filler for gaps and voids that are not intrinsic to the stability of the bony structure.
Bretas, Poly (bytylene aldipate-co-terephthalate)/hydroxyapatite composite structures for bone tissue recovery.
Thiensem, Structure and mechanical properties of retrograded rice starch and cow bone powder composite sponge.
The living bone structure is a natural nanocomposites material formed by an organic collagenous matrix and inorganic salts ((HA) crystals).
Bone void filler is bone graft substitute intended for hard tissue surgical applications, including orthopedic, neurosurgery and dentistry and others, as a filler for gaps and voids that are not intrinsic to the stability of the bony structure.
Bretas, Poly (bytylene aldipate-co-terephthalate)/hydroxyapatite composite structures for bone tissue recovery.
Thiensem, Structure and mechanical properties of retrograded rice starch and cow bone powder composite sponge.
Online since: April 2016
Authors: Ladislav Pařízek, Vlastimil Bílek Jr., Matěj Březina
Chloride resistance of alkali activated slag pastes with fly ash replacement
Ladislav Pařízek1, a *, Vlastimil Bílek Jr.1,b and Matěj Březina1,c
1Brno university of technology, Faculty of Chemistry, Purkyňova 464/118, CZ612 00 Brno, Czech Republic
axcparizekl@fch.vutbr.cz, bxcbilekv@fch.vutbr.cz, cxcbrezinam@fch.vutbr.cz
Keywords: Alkali Activated Slag, Chloride Resistance, Fly Ash, Mercury Intrusion Porosimetry.
The pore structure is the most important parameter of the influence of the water and ion transport particularly the pore volume, the pore size distribution, the connectivity and the shape of pores.
The development of a pore structure in the alkali activated materials in the time is considerably slower than in a cement paste.
This peak should correlate with the throat pore diameter which is practically first connected pore structure in the whole material.
Ye, The pore structure and permeability of alkali activated fly ash, Fuel, Volume 104 (2013), p. 771-780 [5] I.
The pore structure is the most important parameter of the influence of the water and ion transport particularly the pore volume, the pore size distribution, the connectivity and the shape of pores.
The development of a pore structure in the alkali activated materials in the time is considerably slower than in a cement paste.
This peak should correlate with the throat pore diameter which is practically first connected pore structure in the whole material.
Ye, The pore structure and permeability of alkali activated fly ash, Fuel, Volume 104 (2013), p. 771-780 [5] I.