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Online since: July 2015
Authors: A.B. Lidiard
The situation for solids may be made more complex due to the presence of mobile defects in the solid structure (see Howard and Lidiard, (1964) and Allnatt and Lidiard (1993).
In some systems they have also given much insight into static defect structures (see e.g. the many papers of this theme in Phil.
Perhaps we can conclude from the results of the simulations in close-packed structures that the dominance of the virial term in the heat current will not carry over into these open structures in Si, Ge and graphite where focussed collision sequences don’t occur.
Effects of the different structures here should be significant (Section 10 above).
Rev. 154, 605- [75] Sullivan, L.T. (2006) The Heat of Transport of Defects in Iron, a Chemistry Part II thesis, Physical and Theoretical Chemistry Laboratory, University of Oxford
In some systems they have also given much insight into static defect structures (see e.g. the many papers of this theme in Phil.
Perhaps we can conclude from the results of the simulations in close-packed structures that the dominance of the virial term in the heat current will not carry over into these open structures in Si, Ge and graphite where focussed collision sequences don’t occur.
Effects of the different structures here should be significant (Section 10 above).
Rev. 154, 605- [75] Sullivan, L.T. (2006) The Heat of Transport of Defects in Iron, a Chemistry Part II thesis, Physical and Theoretical Chemistry Laboratory, University of Oxford
Online since: February 2026
Authors: Mujtahid Kaavessina, Muhammad Gasim, Septiana Nina Wulandari, Zubad Sunanul Umam, Sulastri Sulastri, Theresia Yunita Lim
FTIR analysis shows that the incorporation of ZnO exhibited no impact on the structure of the bioplastic.
We are investigating the potential interactions between ZnO and the two biopolymers, which influence the structure and properties of the resulting biopolymer composites.
Soleimani, Biodegradability properties of biopolymers, in Biopolymer-Based Metal Nanoparticle Chemistry for Sustainable Applications: Volume 1: Classification, Properties and Synthesis.
Ray, Structure and properties of highly toughened biodegradable polylactide/ZnO biocomposite films.
M Li., Conductive polymer composites with segregated structures.
We are investigating the potential interactions between ZnO and the two biopolymers, which influence the structure and properties of the resulting biopolymer composites.
Soleimani, Biodegradability properties of biopolymers, in Biopolymer-Based Metal Nanoparticle Chemistry for Sustainable Applications: Volume 1: Classification, Properties and Synthesis.
Ray, Structure and properties of highly toughened biodegradable polylactide/ZnO biocomposite films.
M Li., Conductive polymer composites with segregated structures.
Online since: March 2014
Authors: Rafidah Jalil, Nadzeerah Idris, Amizon Azizan, Muhammad Syafiq Jainal, Siti Norsyarahah Che Kamarludin, Sandra Ubong, Nor Sharliza Mohd Safaai, Wan Siti Atikah Wan Omar, Tengku Elida Tengku Zainal Mulok, Intan Suhada Azmi
Ionic liquid (IL) has been shown to affect cellulose crystalline structure in lignocellulosic biomass (LB) during pretreatment.
There are many pretreatment methods that can be used to reduce crystalline structure of cellulose and the lignin content.
Cheng et al. (2012) reported that as the dissolution process progressed, the order of the cellulose structure in the regenerated material decreased [5].
This is also compared with the peak of the original cellulose where the peak is sharper that could show the strong crystalline structure of the cellulose before dissolution.
Singh, Impact of Ionic Liquid Pretreatment Conditions on Cellulose Crystalline Structure Using 1Ethyl-3-methylimidazolium Acetate: The Journal of Physical Chemistry B, Vol. 116 (33) (2012): p. 10049-10054
There are many pretreatment methods that can be used to reduce crystalline structure of cellulose and the lignin content.
Cheng et al. (2012) reported that as the dissolution process progressed, the order of the cellulose structure in the regenerated material decreased [5].
This is also compared with the peak of the original cellulose where the peak is sharper that could show the strong crystalline structure of the cellulose before dissolution.
Singh, Impact of Ionic Liquid Pretreatment Conditions on Cellulose Crystalline Structure Using 1Ethyl-3-methylimidazolium Acetate: The Journal of Physical Chemistry B, Vol. 116 (33) (2012): p. 10049-10054
Online since: November 2012
Authors: Xiao Peng Chi, Shou Feng Yang, Guo Liang Lin, Julian R.G. Evans
Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
5.
Furthermore, the more open structure allows faster drying of rendered layers.
One such structure is the ‘woodpile’ [19-21].
The procedure is ideally suited to prototyping of photonic band gap structures.
Joannopoulous, Donor and Acceptor Modes in Photonic Band Structure, Phys.
Furthermore, the more open structure allows faster drying of rendered layers.
One such structure is the ‘woodpile’ [19-21].
The procedure is ideally suited to prototyping of photonic band gap structures.
Joannopoulous, Donor and Acceptor Modes in Photonic Band Structure, Phys.
Online since: November 2012
Authors: Qi Xia Liu, Liang Fan
Stratum structure.
The Investigate on the Mechanism of Loess Slope Instability Changes in soil structure and soil structure model.
Loess structure and sequence structure clearly with a level of sequence.
The general structure is in north-south direction.
The Internal causes major have geographic and geomorphic conditions,geologic structure,lithology,soil structure etc.
The Investigate on the Mechanism of Loess Slope Instability Changes in soil structure and soil structure model.
Loess structure and sequence structure clearly with a level of sequence.
The general structure is in north-south direction.
The Internal causes major have geographic and geomorphic conditions,geologic structure,lithology,soil structure etc.
Online since: September 2011
Authors: Zhi Xi Li, Hua Dong Xie, Li Jun Bu, Xiang Wei Peng
A present trend in analytical chemistry is the development of methodologies able to provide“fitness for purpose” results, which take into account aspects related with the importance of time against accuracy achieved.
In order to show trends or different data structures hidden in the M matrix, a new c-dimensional space can also be built from the original m-dimensional[27]. 2).
Artificial neural network (ANN):Artificial neural networks are defined as structures comprised of densely interconnected adaptive simple processing elements, called artificial neurons (or nodes) that are capable of performing massively parallel computations for data processing and knowledge representation[31] .
Comparison analysis of chromatographic fingerprints of curcuma ileum from different species using multivariate resolution methods.Computers and applied chemistry.
In order to show trends or different data structures hidden in the M matrix, a new c-dimensional space can also be built from the original m-dimensional[27]. 2).
Artificial neural network (ANN):Artificial neural networks are defined as structures comprised of densely interconnected adaptive simple processing elements, called artificial neurons (or nodes) that are capable of performing massively parallel computations for data processing and knowledge representation[31] .
Comparison analysis of chromatographic fingerprints of curcuma ileum from different species using multivariate resolution methods.Computers and applied chemistry.
Constraint Handling and Flow Control in Stirred Tank Bioreactors with Magnetically Coupled Impellers
Online since: October 2022
Authors: Dagnija Loca, Armands Buss, Arturs Suleiko, Normunds Jekabsons, Juris Vanags
Constraint Handling and Flow Control in Stirred Tank Bioreactors with Magnetically Coupled Impellers
Armands Buss1,a, Arturs Suleiko2,b, Normunds Jekabsons3,c, Juris Vanags2,d, Dagnija Loca,1,4,e*
1Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka St 3, Riga, LV-1007, Latvia
2Latvian State Institute of Wood Chemistry, Dzerbenes street 27, Riga LV-1006, Latvia
3Institute of Physics, University of Latvia, Jelgavas St 3, Riga, LV-1004, Latvia
4Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, Riga, Latvia
aarmands.buss@rtu.lv, barturs.suleiko.00@rpg.lv, cnormunds@jesystems.eu, dbtc@edi.lv, edagnija.loca@rtu.lv*
Keywords: Xanthan gum, bioreactor, stirring velocity, mixing impellers, flow models, CFD, CFX, MRF.
Table 2 Bioreactor geometry parameters (* from the top of the shaft to the impeller hub disc) Parameter Value Dimension Impeller diameter 700 [mm] Impeller blades area 220 [cm2] Shaft housing diameter 185 [mm] Tank diameter 2150 [mm] Tank height (cylindrical) 3450 [mm] Work volume 15000 [L] Baffle width 180 [mm] Baffle offset from wall 30 [mm] Number of baffles 4 [-] 1st impeller position* 52 [mm] 2nd impeller position* 646 [mm] 3rd impeller position* 1866 [mm] CFD model: The conservation equations (for all phases) were derived to obtain a set of governing equations with similar structure [10].
García-Ochoa, “Xanthan gum production under several operational conditions: Molecular structure and rheological properties,” Enzyme Microb.
Table 2 Bioreactor geometry parameters (* from the top of the shaft to the impeller hub disc) Parameter Value Dimension Impeller diameter 700 [mm] Impeller blades area 220 [cm2] Shaft housing diameter 185 [mm] Tank diameter 2150 [mm] Tank height (cylindrical) 3450 [mm] Work volume 15000 [L] Baffle width 180 [mm] Baffle offset from wall 30 [mm] Number of baffles 4 [-] 1st impeller position* 52 [mm] 2nd impeller position* 646 [mm] 3rd impeller position* 1866 [mm] CFD model: The conservation equations (for all phases) were derived to obtain a set of governing equations with similar structure [10].
García-Ochoa, “Xanthan gum production under several operational conditions: Molecular structure and rheological properties,” Enzyme Microb.
Online since: January 2012
Authors: Zai Sheng Cai, Yong Shen, Ying Ding, Xue Jun Lou, Li Ming Wang
The bast fiber is cellulose fiber and similar to cotton, but there are differences in component, structure and supermolecular structure.
It could be conjectured that there is a highly regular supermolecular structure in bast fiber [3, 4].
Because of the high regularity and low mobility of its basic structure unit in bast fiber, the stress would be concentrated after finishing.
Based on Tables 2 and 3, the technical parameters could be analyzed and determined as concentration of finish FR-ECO 80-100 g/L, the dose of catalyst MgCl2 8% relative to dose of finish, curing temperature 150-160 oC for 3-4 mins. 3.4 The influence of pre-treatment with alkali on wash and wear finish effect on bast fabric NaOH liquor can make the cellulose structure swell changing the supermolecular structure of cellulose fiber and making the tightly bonded web structure irreversible swelling, increasing the distance between molecule chains and void of structure units where finish molecule could enter [3, 5].The finishing effect of ramie fabric treated by finish 80 g/L with MgCl2 8% after treating with different concentrations of NaOH liquor is shown in Table 4.
The breaking tenacity loss percentage would be increased to a certain degree because the movability of structure unit and molecule chain were poor.
It could be conjectured that there is a highly regular supermolecular structure in bast fiber [3, 4].
Because of the high regularity and low mobility of its basic structure unit in bast fiber, the stress would be concentrated after finishing.
Based on Tables 2 and 3, the technical parameters could be analyzed and determined as concentration of finish FR-ECO 80-100 g/L, the dose of catalyst MgCl2 8% relative to dose of finish, curing temperature 150-160 oC for 3-4 mins. 3.4 The influence of pre-treatment with alkali on wash and wear finish effect on bast fabric NaOH liquor can make the cellulose structure swell changing the supermolecular structure of cellulose fiber and making the tightly bonded web structure irreversible swelling, increasing the distance between molecule chains and void of structure units where finish molecule could enter [3, 5].The finishing effect of ramie fabric treated by finish 80 g/L with MgCl2 8% after treating with different concentrations of NaOH liquor is shown in Table 4.
The breaking tenacity loss percentage would be increased to a certain degree because the movability of structure unit and molecule chain were poor.
Online since: May 2011
Authors: Wei Qun Cao, Tie Jun Zhao, Xiao Mei Wan
Both for the design of new structures and for condition assessment of existing structures, knowledge of reliable Ccrit values is important as the remaining service life is often considered as the time required to reach the chloride threshold value at the depth of the reinforcement.
The reported Ccrit values in Table 1 are derived from investigations of bridge decks and coastal structures or samples under outdoor exposure conditions.
For structures exposed to the atmosphere, the potential of the reinforcement is usually between +100 and −200mV SCE, whereas for submerged structures it is in the range of −400 to −500mV SCE and consequently higher chloride concentrations can be tolerated.
[6] RILEM, Draft recommendation for repair strategies for concrete structures damaged by reinforcement corrosion, Materials and Structures 27 (1994) 415-436
Andrade, Synthetic concrete pore solution chemistry and rebar corrosion rate in the presence of chlorides, Cem Concr Res 20 (1990) 525-539
The reported Ccrit values in Table 1 are derived from investigations of bridge decks and coastal structures or samples under outdoor exposure conditions.
For structures exposed to the atmosphere, the potential of the reinforcement is usually between +100 and −200mV SCE, whereas for submerged structures it is in the range of −400 to −500mV SCE and consequently higher chloride concentrations can be tolerated.
[6] RILEM, Draft recommendation for repair strategies for concrete structures damaged by reinforcement corrosion, Materials and Structures 27 (1994) 415-436
Andrade, Synthetic concrete pore solution chemistry and rebar corrosion rate in the presence of chlorides, Cem Concr Res 20 (1990) 525-539
Online since: October 2006
Authors: N.C. Hyatt, M.C. Stennett, Ewan R. Maddrell, William Edward Lee
The
crystal chemistry of Ce3+ / Ce
4+
and Pu
3+ / Pu
4+
are similar, as reflected in the similar ionic radii of
1.15 / 1.01 Å and 1.14 / 1.00 Å, respectively, for 6-fold co-ordination; the ionic radii of Ce4+ and
Pu
4+
in 8-fold co-ordination are 1.11 Å and 1.10 Å, respectively [2].
Results Pyrochlore ceramics The pyrochlore structure, A2B2O7, is an oxygen deficient, cation ordered derivative of the fluorite structure.
Zirconolite ceramics The structure of zirconolite, CaZrTi2O7, is a derivative of an anion deficient fluorite structure obtained by cation ordering on layers normal to the c-axis.
Britholite ceramics The structure of britholite, Ca2Y8Si6O26, is related to that of apatite and consists of corner sharing (Ca,Y)O6 trigonal prisms and SiO4 tetrahedra, that form one-dimensional tunnels parallel to the caxis of the structure, the tunnels contain additional trigonal prismatic (Ca,Y)O6 sites.
The structure may be considered as a three-dimensional [A2(BO4)3] framework, formed by corner sharing BO4 tetrahedra and AO6 octahedra.
Results Pyrochlore ceramics The pyrochlore structure, A2B2O7, is an oxygen deficient, cation ordered derivative of the fluorite structure.
Zirconolite ceramics The structure of zirconolite, CaZrTi2O7, is a derivative of an anion deficient fluorite structure obtained by cation ordering on layers normal to the c-axis.
Britholite ceramics The structure of britholite, Ca2Y8Si6O26, is related to that of apatite and consists of corner sharing (Ca,Y)O6 trigonal prisms and SiO4 tetrahedra, that form one-dimensional tunnels parallel to the caxis of the structure, the tunnels contain additional trigonal prismatic (Ca,Y)O6 sites.
The structure may be considered as a three-dimensional [A2(BO4)3] framework, formed by corner sharing BO4 tetrahedra and AO6 octahedra.