nguyen văn Trung | Ho Chi Minh City University of technology (original) (raw)
Papers by nguyen văn Trung
Chemical Physics Letters, 2013
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Physical Chemistry Chemical Physics
L-Aspartic acid has recently been found to be a good leaving group during HIV reverse transcripta... more L-Aspartic acid has recently been found to be a good leaving group during HIV reverse transcriptase catalyzed incorporation of deoxyadenosine monophosphate (dAMP) in DNA. This showed that L-Asp is a good mimic for the pyrophosphate moiety of deoxyadenosine triphosphate. The present work explores the thermochemistry and mechanism for hydrolysis of several models for L-aspartic-dAMP using B3LYP/DGDZVP, MP2/6-311++G** and G3MP2 level of theory. The effect of the new compound is gradually investigated: starting from a simple methyl amine leaving group up to the aspartic acid leaving group. The enzymatic environment was mimicked by involving two Mg(2+) ions and some important active site residues in the reaction. All reactions are compared to the corresponding O-coupled leaving group, which is methanol for methyl amine and malic acid for aspartic acid. With methyl amine as a leaving group a tautomeric associative or tautomeric dissociative mechanism is preferred and the barrier is lower ...
Physical Chemistry Chemical Physics
In this study, 16 gas phase complexes of the pairs of XCHZ and CO(2) (X = F, Cl, Br; Z = O, S) ha... more In this study, 16 gas phase complexes of the pairs of XCHZ and CO(2) (X = F, Cl, Br; Z = O, S) have been identified. Interaction energies calculated at the CCSD(T)/aug-cc-pVTZ//MP2/aug-cc-pVTZ level including both BSSE and ZPE corrections range from -5.6 to -10.5 kJ mol(-1) for XCHOCO(2) and from -5.7 to -9.1 kJ mol(-1) for XCHS···CO(2). Substitution of one H atom by one halogen in formaldehyde and thioformaldehyde reduces the interaction energy of XCHZ···CO(2), while a CH(3) substitution increases the interaction energy of both CH(3)CHO···CO(2) and CH(3)CHS···CO(2). NBO and AIM analyses also point out that the strength of Lewis acid-base interactions decreases going from >C1=S3···C6 to >C1=O3C6 and to >C1-X4···C6. This result suggests the higher capacity of solubility of thiocarbonyl compounds in scCO(2), providing an enormous potential application for designing CO(2)-philic materials based on the >C=S functional group in competition with >C=O. The Lewis acid-base in...
Dyes and Pigments
A fluorescent chemosensor based on dimethylaminocinnamaldehyde-aminothiourea (DA) has been design... more A fluorescent chemosensor based on dimethylaminocinnamaldehyde-aminothiourea (DA) has been designed, synthesized, and applied with a combined theoretical and experimental study. The synthetic path, optimized molecular structure and characteristics of DA were carried out using the calculations at the B3LYP/LanL2DZ level of theory. The experimental investigations have a good agreement with the theoretical results. DA can be used as a chemosensor for simultaneous quantification of silver, copper, and mercury ions in aqueous solution at the ppb level. The stable geometric structures of the complexes between DA and Ag+, Hg2+, Cu2+ with stoichiometry of 1:1, 2:1, and 2:1, have been found and investigated for electronic properties and fluorescence quenching phenomena by using Atoms in Molecules (AIM) and Natural Bond Orbitals (NBO) analyses.
Physical Chemistry Chemical Physics
Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction bet... more Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction between HNZ (Z = O, S) and H(2)XNH(2) (X = B, Al). In the most stable conformation, the complexes are cyclic, the molecules being held together by conventional NHZ hydrogen bonds and by XHHN dihydrogen bonds. Binding energies including ZPE- and BSSE-corrections lie in the range 6.2-6.9 kJ mol(-1) and there is little sensitivity to the nature of the X and Z atoms. In the XHHN dihydrogen bonds, the NH stretching vibrations are blue-shifted in the HNO complexes and red-shifted in the H(2)AlNH(2)-HNS complex. In the conventional NHZ hydrogen bonds, the NH stretching vibrations are red-shifted. The topological parameters at the bond critical point are in the usual range for hydrogen or dihydrogen bonds. A natural bond orbital analysis including the calculation of the atomic charges, hybridization, occupation of the antibonding orbitals and hyperconjugation energies shows that the shifts of the N...
Chemistry Letters
A new dansyl diethylenetriamine thiourea conjugate (DT) was prepared as a highly selective and se... more A new dansyl diethylenetriamine thiourea conjugate (DT) was prepared as a highly selective and sensitive fluorescent chemodosimeter for Hg2+ ions. A Hg2+-induced desulfurization reaction followed by the cyclic guanylation of the thiourea moiety of DT is responsible for distinct fluorescence quenching. However, no changes were found for other ions including Zn2+, Cu2+, Cd2+, Pb2+, Ag+, Fe2+, Cr3+, Co3+, Ni2+, Ca2+, Mg2+, K+, and Na+. Remarkably, the response rate of DT to Hg2+ is very fast (within 20 s), whereas other similar fluorescent chemodosimeters generally require 30 mm or more to complete the reaction.
International Journal of Nanotechnology, 2015
TiO 2 /SBA-15 composite photocatalysts with the different TiO 2 :SiO 2 mass ratios of 25:75, 40:6... more TiO 2 /SBA-15 composite photocatalysts with the different TiO 2 :SiO 2 mass ratios of 25:75, 40:60, 50:50 and 75:25 have been successfully synthesized using hydrothermal method. Characterization techniques were utilized including X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption experiments. Remarkably, the obtained products have highly ordered hexagonal mesoporous structure with uniform pore sizes and large specific surface areas. The TiO 2 :SiO 2 mass ratio of 50:50 as compared to the remaining ones is the best suitability in enhancing photocatalytic activity for the TiO 2 /SBA-15 material. It is noteworthy that in all the Ag-doped samples of TiO 2 /SBA-15 material (TiO 2 /SiO 2 =1) the 4 wt % Ag-TiO 2 /SBA-15 has the highest photocatalytic ability under the sun light.
Veterinary Microbiology, 1998
Sixteen isolates of Pasteurella multocida were cultured from cases diagnosed as acute septicaemic... more Sixteen isolates of Pasteurella multocida were cultured from cases diagnosed as acute septicaemic pasteurellosis in Vietnamese pigs. The HSB±PCR assay provided rapid presumptive determination of 10 isolates of P. multocida identified as haemorrhagic septicaemia (HS) causing type B cultures (B:2, B:5, B:2,5). Serological designation using the Carter and Heddleston typing systems confirmed these findings, and identified the six HSB±PCR negative cultures as either A:1, A:3 or D:3,4. Biochemical fermentation and REP±PCR revealed phenotypic and genotypic identity between P. multocida type A:1 isolated from Vietnamese pigs and poultry. Marked homogeneity was also demonstrated among HSB±PCR positive swine isolates, which were shown to possess genotypic identity with P. multocida type B:2 from buffaloes diagnosed with HS. # 1998 Elsevier Science B.V. All rights reserved.
2013 International Conference on Advanced Technologies for Communications (ATC 2013), 2013
ABSTRACT This paper represents an autoregressive (AR) neural network for recognizing eye movement... more ABSTRACT This paper represents an autoregressive (AR) neural network for recognizing eye movement commands for control of an electrical wheelchair using EEG technology. The eye movements such as opening eyes, blinking eyes, glancing left and glancing right related to a few areas of human brain were investigated. A Hamming low-pass filter was applied to remove noise and artifacts of the eye movement signals and to extract the frequency range of the measured signals. An autoregressive model was employed to produce coefficients containing features of the EEG eye signals. The coefficients obtained were inserted the input layer of a neural network (NN) model to classify the eye activities. From the identified output of the network, the wheelchair was controlled to follow the desired direction of user. Experimental results of controlling the wheelchair in the indoor environment showed to illustrate the effectiveness of the proposed approach.
Zoonoses and Public Health, 2014
• This paper reports high levels of antimicrobial usage in chicken farms in the Mekong delta of V... more • This paper reports high levels of antimicrobial usage in chicken farms in the Mekong delta of Vietnam (about 6 times higher than the levels of usage reported in some European countries); 84% of the administrations had prophylactic purposes (i.e. to prevent rather than treat disease).
Water International, 2012
By comparing the successful story of a hydrodynamic model (based on its contribution to policy ch... more By comparing the successful story of a hydrodynamic model (based on its contribution to policy changes, management options and livelihood improvement) with other modelling cases in the Mekong River Delta, five success factors are identified. These are (1) simulated phenomena relevant to and understandable by policy makers; (2) response to the needs of policy setting; (3) developed and handled by
Veterinary Microbiology, 2000
A total of 36 tonsil swab samples were collected from healthy swine prior to slaughter at the aba... more A total of 36 tonsil swab samples were collected from healthy swine prior to slaughter at the abattoirs in Can tho and Tien giang provinces of Southern Vietnam. The presence of Pasteurella multocida in these samples was detected by the combination of direct cultivation and isolation, mouse inoculation and the polymerase chain reaction (PM-PCR). P. multocida was detected in 16 samples by PCR, with 17 strains ultimately isolated. All samples were negative for serogroup B by HSB-PCR and conventional serotyping, with isolates identi®ed as A:3, D:1 or D:3. In addition, all samples were determined to be negative for the P. multocida toxin (PMT). Characterisation of isolated P. multocida by REP-PCR and biotyping revealed nine distinct REP pro®les and seven biotypes among the 17 isolates. Some correlation was seen with P. multocida isolated from a previous Australian outbreak of acute swine pasteurellosis, and those isolated from fowl cholera outbreaks in Vietnamese poultry. #
The Journal of Physical Chemistry A, 2013
Unimolecular decompositions of neutral (NH 2 CHO) and protonated (NH 3 CHO + ) formamide, an acti... more Unimolecular decompositions of neutral (NH 2 CHO) and protonated (NH 3 CHO + ) formamide, an active precursor of biomolecules in prebiotic chemistry, are investigated in the ground (S 0 ) and first triplet (T 1 ) and singlet (S 1 ) excited states. Different decomposition channels including the homolytic bond dissociations, dehydration, decarbonylation, dehydrogenation, etc., are explored using coupled-cluster theory (CCSD(T)/CBS method) for both S 0 and T 1 states and RASPT2(18,15)/6-31G(d,p) computations for the S 1 state. On S 1 and T 1 energy surfaces, formamide preferentially follows C−N homolytic bond cleavages forming NH 2 + HCO radical pairs. Formation of HCN and HNC from dehydration of neutral and protonated formamide via formimic acid and aminohydroxymethylene isomers has higher energy barriers. A strong stabilization upon triplet excitation of the two latter isomers significantly facilitates the interconversions between isomers, and thus considerably reduces the energy barriers for dehydration pathways. The most probable pathways for HCN and HNC generation are found to be dehydration of formamide in the T 1 state. Dehydration pathways from the neutral S 1 and protonated T 1 forms lead to stable complexes of HCN and HNC with water but are associated with large energy barriers. Overall, in the lower-lying excited states of either neutral or protonated formamide, dehydration is not competitive with homolytic C−N bond cleavages, which finally lead to formation of CO.
Physical Chemistry Chemical Physics, 2008
Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction bet... more Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction between HNZ (Z = O, S) and H 2 XNH 2 (X = B, Al). In the most stable conformation, the complexes are cyclic, the molecules being held together by conventional NHÁ Á ÁZ hydrogen bonds and by XHÁ Á ÁHN dihydrogen bonds. Binding energies including ZPE-and BSSE-corrections lie in the range 6.2-6.9 kJ mol À1 and there is little sensitivity to the nature of the X and Z atoms. In the XHÁ Á ÁHN dihydrogen bonds, the NH stretching vibrations are blue-shifted in the HNO complexes and red-shifted in the H 2 AlNH 2 -HNS complex. In the conventional NHÁ Á ÁZ hydrogen bonds, the NH stretching vibrations are red-shifted. The topological parameters at the bond critical point are in the usual range for hydrogen or dihydrogen bonds. A natural bond orbital analysis including the calculation of the atomic charges, hybridization, occupation of the antibonding orbitals and hyperconjugation energies shows that the shifts of the NH stretching vibrations in the conventional and dihydrogen bonds are mainly determined by the changes in occupation of the s*(NH) antibonding orbitals. The mechanism of intramolecular coupling is discussed and appears to be different for the HNO and HNS complexes. The analysis of all the theoretical data reveals that the NHÁ Á ÁZ bonds are stronger in the H 2 BNH 2 than in the H 2 AlNH 2 systems and that the XHÁ Á ÁHN dihydrogen bonds are stronger in the H 2 AlNH 2 than in the H 2 BNH 2 complexes. w Electronic supplementary information (ESI) available: Cartesian coordinates and energies including ZPE correction of monomers and complexes at the MP2/6-311++G(2d,2p) level of theory. See
Physical Chemistry Chemical Physics, 2009
The hydrogen-bonded complexes formed from interaction of trihalomethanes CHX(3) (X = F, Cl, Br) w... more The hydrogen-bonded complexes formed from interaction of trihalomethanes CHX(3) (X = F, Cl, Br) with nitrosyl hydride HNO were studied using ab initio MO calculations at the second-order perturbation theory (MP2/6-311++G(d,p)). Each interaction contains at least five separate equilibrium structures. Calculated binding energies range from 4 to 8 kJ mol(-1) with both ZPE and BSSE corrections. While CHBr(3) leads to the most stable complexes with HNO, CHF(3) forms the least stable counterparts. The strength of complexes thus tends to increase from F to Cl to Br, which is consistent with a decrease of deprotonation enthalpy of the corresponding C-H bonds. It is remarkable that all the C-H and N-H bonds are shortened upon complexation, giving rise to an increase of their stretching frequencies. A blue shift is thus observed for the N-H bonds of the type N-HX (X = F, Cl, Br); such a contraction of the covalent N-H bond is extremely rare.
Journal of Mineralogical and Petrological Sciences, 2007
... Nguyen Minh TRUNG *, **, Nguyen Dieu NUONG * and Tetsumaru ITAYA * ... Than, LV, Trung, NM, U... more ... Nguyen Minh TRUNG *, **, Nguyen Dieu NUONG * and Tetsumaru ITAYA * ... Than, LV, Trung, NM, Uy, ND, Hoc, NV, Thuat, TD, Manh, LV, Chinh, KC, Tuat, LT and Ngoc, D. (2000) Tectonics and Metallogeny of North Northern Central of Vietnam. ...
clrri.org
... 23: 2330) Duong TP, CN Diep, NT Khiem, NH Hiep, NV Toi, NY Lich, and LTK Nhan. 1984. ... Hai ... more ... 23: 2330) Duong TP, CN Diep, NT Khiem, NH Hiep, NV Toi, NY Lich, and LTK Nhan. 1984. ... Hai doìn g SB 83 vaìSB 177 khi âæåüc æïn g duûn g boïn phäúi håüp våïi 20 N (kg/ha) cuîng coïbiãøu hiãûn cäün g sinh täút trãn giäún g âáûu naìn h rau “VL 3”. Hai doìn g ...
International Journal of Refrigeration, 2008
Alloy Manganese a b s t r a c t Magnetic refrigeration employing magnetically ordered materials i... more Alloy Manganese a b s t r a c t Magnetic refrigeration employing magnetically ordered materials is a relatively novel technique, differing in some respects from magnetic cooling by means of adiabatic demagnetization of paramagnetic substances. Magnetic refrigeration has been known for more than a century and is based on the magnetocaloric effect. It has received new impetus recently because it has several advantages over vapor-compression refrigeration. In the last few years the magnetic and magnetocaloric properties of a large number of intermetallic compounds were investigated, in which the magnetic moments are carried by atoms of 3d transition elements. In the present paper we will focus on intermetallic compounds in which one of the components is Mn. The results obtained on several groups of such intermetallic compounds will be reviewed. By far the most promising materials of this group of intermetallics are compounds of the type MnFeP 1Àx As x . Although it is understood that these compounds are probably nontoxic, the presence of As atoms in them might form a mental barrier to exploit these materials on a commercial basis. Special attention will therefore be paid to efforts attempting to substitute other elements for As in MnFeP 1Àx As x with the proviso that the favorable magnetocaloric properties be retained. ª 2007 Elsevier Ltd and IIR. All rights reserved. Le point sur les maté riaux à base de Mn utilisé dans le froid magné tique : structure et proprié té s Mots clés : Ré frigé rateur magné tique ; Enquê te ; Proprié té magné tique ; Alliage ; Manganè se 1. (K.H.J. Buschow).
Chemical Physics Letters, 2014
Interactions of CO 2 with CH 3 SZCHX 2 (Z@O, S; X@H, CH 3 , F, Cl, Br) induce significantly stabl... more Interactions of CO 2 with CH 3 SZCHX 2 (Z@O, S; X@H, CH 3 , F, Cl, Br) induce significantly stable complexes with interaction energies from À13.7 to À16.4 kJ mol À1 (MP2/aug-cc-pVTZ//MP2/6-311++G(2d,2p)). Remarkably, some stable shapes of CH 3 SZCH 3 Á Á ÁCO 2 are revealed for the first time. Substitution of two H atoms in a CH 3 of CH 3 SZCH 3 by two X alike groups makes CH 3 SZCHX 2 Á Á ÁCO 2 more stable than CH 3 SZCH 3 Á Á ÁCO 2 , and their stability increases in the order F < Cl < Br < CH 3 . The >S@O is stronger than the >S@S in interacting with CO 2 , and they both can be valuable candidates in the design of CO 2 -philic materials and in the findings of materials to adsorb CO 2 .
Chemical Physics Letters, 2013
and sharing with colleagues.
Physical Chemistry Chemical Physics
L-Aspartic acid has recently been found to be a good leaving group during HIV reverse transcripta... more L-Aspartic acid has recently been found to be a good leaving group during HIV reverse transcriptase catalyzed incorporation of deoxyadenosine monophosphate (dAMP) in DNA. This showed that L-Asp is a good mimic for the pyrophosphate moiety of deoxyadenosine triphosphate. The present work explores the thermochemistry and mechanism for hydrolysis of several models for L-aspartic-dAMP using B3LYP/DGDZVP, MP2/6-311++G** and G3MP2 level of theory. The effect of the new compound is gradually investigated: starting from a simple methyl amine leaving group up to the aspartic acid leaving group. The enzymatic environment was mimicked by involving two Mg(2+) ions and some important active site residues in the reaction. All reactions are compared to the corresponding O-coupled leaving group, which is methanol for methyl amine and malic acid for aspartic acid. With methyl amine as a leaving group a tautomeric associative or tautomeric dissociative mechanism is preferred and the barrier is lower ...
Physical Chemistry Chemical Physics
In this study, 16 gas phase complexes of the pairs of XCHZ and CO(2) (X = F, Cl, Br; Z = O, S) ha... more In this study, 16 gas phase complexes of the pairs of XCHZ and CO(2) (X = F, Cl, Br; Z = O, S) have been identified. Interaction energies calculated at the CCSD(T)/aug-cc-pVTZ//MP2/aug-cc-pVTZ level including both BSSE and ZPE corrections range from -5.6 to -10.5 kJ mol(-1) for XCHOCO(2) and from -5.7 to -9.1 kJ mol(-1) for XCHS···CO(2). Substitution of one H atom by one halogen in formaldehyde and thioformaldehyde reduces the interaction energy of XCHZ···CO(2), while a CH(3) substitution increases the interaction energy of both CH(3)CHO···CO(2) and CH(3)CHS···CO(2). NBO and AIM analyses also point out that the strength of Lewis acid-base interactions decreases going from >C1=S3···C6 to >C1=O3C6 and to >C1-X4···C6. This result suggests the higher capacity of solubility of thiocarbonyl compounds in scCO(2), providing an enormous potential application for designing CO(2)-philic materials based on the >C=S functional group in competition with >C=O. The Lewis acid-base in...
Dyes and Pigments
A fluorescent chemosensor based on dimethylaminocinnamaldehyde-aminothiourea (DA) has been design... more A fluorescent chemosensor based on dimethylaminocinnamaldehyde-aminothiourea (DA) has been designed, synthesized, and applied with a combined theoretical and experimental study. The synthetic path, optimized molecular structure and characteristics of DA were carried out using the calculations at the B3LYP/LanL2DZ level of theory. The experimental investigations have a good agreement with the theoretical results. DA can be used as a chemosensor for simultaneous quantification of silver, copper, and mercury ions in aqueous solution at the ppb level. The stable geometric structures of the complexes between DA and Ag+, Hg2+, Cu2+ with stoichiometry of 1:1, 2:1, and 2:1, have been found and investigated for electronic properties and fluorescence quenching phenomena by using Atoms in Molecules (AIM) and Natural Bond Orbitals (NBO) analyses.
Physical Chemistry Chemical Physics
Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction bet... more Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction between HNZ (Z = O, S) and H(2)XNH(2) (X = B, Al). In the most stable conformation, the complexes are cyclic, the molecules being held together by conventional NHZ hydrogen bonds and by XHHN dihydrogen bonds. Binding energies including ZPE- and BSSE-corrections lie in the range 6.2-6.9 kJ mol(-1) and there is little sensitivity to the nature of the X and Z atoms. In the XHHN dihydrogen bonds, the NH stretching vibrations are blue-shifted in the HNO complexes and red-shifted in the H(2)AlNH(2)-HNS complex. In the conventional NHZ hydrogen bonds, the NH stretching vibrations are red-shifted. The topological parameters at the bond critical point are in the usual range for hydrogen or dihydrogen bonds. A natural bond orbital analysis including the calculation of the atomic charges, hybridization, occupation of the antibonding orbitals and hyperconjugation energies shows that the shifts of the N...
Chemistry Letters
A new dansyl diethylenetriamine thiourea conjugate (DT) was prepared as a highly selective and se... more A new dansyl diethylenetriamine thiourea conjugate (DT) was prepared as a highly selective and sensitive fluorescent chemodosimeter for Hg2+ ions. A Hg2+-induced desulfurization reaction followed by the cyclic guanylation of the thiourea moiety of DT is responsible for distinct fluorescence quenching. However, no changes were found for other ions including Zn2+, Cu2+, Cd2+, Pb2+, Ag+, Fe2+, Cr3+, Co3+, Ni2+, Ca2+, Mg2+, K+, and Na+. Remarkably, the response rate of DT to Hg2+ is very fast (within 20 s), whereas other similar fluorescent chemodosimeters generally require 30 mm or more to complete the reaction.
International Journal of Nanotechnology, 2015
TiO 2 /SBA-15 composite photocatalysts with the different TiO 2 :SiO 2 mass ratios of 25:75, 40:6... more TiO 2 /SBA-15 composite photocatalysts with the different TiO 2 :SiO 2 mass ratios of 25:75, 40:60, 50:50 and 75:25 have been successfully synthesized using hydrothermal method. Characterization techniques were utilized including X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption experiments. Remarkably, the obtained products have highly ordered hexagonal mesoporous structure with uniform pore sizes and large specific surface areas. The TiO 2 :SiO 2 mass ratio of 50:50 as compared to the remaining ones is the best suitability in enhancing photocatalytic activity for the TiO 2 /SBA-15 material. It is noteworthy that in all the Ag-doped samples of TiO 2 /SBA-15 material (TiO 2 /SiO 2 =1) the 4 wt % Ag-TiO 2 /SBA-15 has the highest photocatalytic ability under the sun light.
Veterinary Microbiology, 1998
Sixteen isolates of Pasteurella multocida were cultured from cases diagnosed as acute septicaemic... more Sixteen isolates of Pasteurella multocida were cultured from cases diagnosed as acute septicaemic pasteurellosis in Vietnamese pigs. The HSB±PCR assay provided rapid presumptive determination of 10 isolates of P. multocida identified as haemorrhagic septicaemia (HS) causing type B cultures (B:2, B:5, B:2,5). Serological designation using the Carter and Heddleston typing systems confirmed these findings, and identified the six HSB±PCR negative cultures as either A:1, A:3 or D:3,4. Biochemical fermentation and REP±PCR revealed phenotypic and genotypic identity between P. multocida type A:1 isolated from Vietnamese pigs and poultry. Marked homogeneity was also demonstrated among HSB±PCR positive swine isolates, which were shown to possess genotypic identity with P. multocida type B:2 from buffaloes diagnosed with HS. # 1998 Elsevier Science B.V. All rights reserved.
2013 International Conference on Advanced Technologies for Communications (ATC 2013), 2013
ABSTRACT This paper represents an autoregressive (AR) neural network for recognizing eye movement... more ABSTRACT This paper represents an autoregressive (AR) neural network for recognizing eye movement commands for control of an electrical wheelchair using EEG technology. The eye movements such as opening eyes, blinking eyes, glancing left and glancing right related to a few areas of human brain were investigated. A Hamming low-pass filter was applied to remove noise and artifacts of the eye movement signals and to extract the frequency range of the measured signals. An autoregressive model was employed to produce coefficients containing features of the EEG eye signals. The coefficients obtained were inserted the input layer of a neural network (NN) model to classify the eye activities. From the identified output of the network, the wheelchair was controlled to follow the desired direction of user. Experimental results of controlling the wheelchair in the indoor environment showed to illustrate the effectiveness of the proposed approach.
Zoonoses and Public Health, 2014
• This paper reports high levels of antimicrobial usage in chicken farms in the Mekong delta of V... more • This paper reports high levels of antimicrobial usage in chicken farms in the Mekong delta of Vietnam (about 6 times higher than the levels of usage reported in some European countries); 84% of the administrations had prophylactic purposes (i.e. to prevent rather than treat disease).
Water International, 2012
By comparing the successful story of a hydrodynamic model (based on its contribution to policy ch... more By comparing the successful story of a hydrodynamic model (based on its contribution to policy changes, management options and livelihood improvement) with other modelling cases in the Mekong River Delta, five success factors are identified. These are (1) simulated phenomena relevant to and understandable by policy makers; (2) response to the needs of policy setting; (3) developed and handled by
Veterinary Microbiology, 2000
A total of 36 tonsil swab samples were collected from healthy swine prior to slaughter at the aba... more A total of 36 tonsil swab samples were collected from healthy swine prior to slaughter at the abattoirs in Can tho and Tien giang provinces of Southern Vietnam. The presence of Pasteurella multocida in these samples was detected by the combination of direct cultivation and isolation, mouse inoculation and the polymerase chain reaction (PM-PCR). P. multocida was detected in 16 samples by PCR, with 17 strains ultimately isolated. All samples were negative for serogroup B by HSB-PCR and conventional serotyping, with isolates identi®ed as A:3, D:1 or D:3. In addition, all samples were determined to be negative for the P. multocida toxin (PMT). Characterisation of isolated P. multocida by REP-PCR and biotyping revealed nine distinct REP pro®les and seven biotypes among the 17 isolates. Some correlation was seen with P. multocida isolated from a previous Australian outbreak of acute swine pasteurellosis, and those isolated from fowl cholera outbreaks in Vietnamese poultry. #
The Journal of Physical Chemistry A, 2013
Unimolecular decompositions of neutral (NH 2 CHO) and protonated (NH 3 CHO + ) formamide, an acti... more Unimolecular decompositions of neutral (NH 2 CHO) and protonated (NH 3 CHO + ) formamide, an active precursor of biomolecules in prebiotic chemistry, are investigated in the ground (S 0 ) and first triplet (T 1 ) and singlet (S 1 ) excited states. Different decomposition channels including the homolytic bond dissociations, dehydration, decarbonylation, dehydrogenation, etc., are explored using coupled-cluster theory (CCSD(T)/CBS method) for both S 0 and T 1 states and RASPT2(18,15)/6-31G(d,p) computations for the S 1 state. On S 1 and T 1 energy surfaces, formamide preferentially follows C−N homolytic bond cleavages forming NH 2 + HCO radical pairs. Formation of HCN and HNC from dehydration of neutral and protonated formamide via formimic acid and aminohydroxymethylene isomers has higher energy barriers. A strong stabilization upon triplet excitation of the two latter isomers significantly facilitates the interconversions between isomers, and thus considerably reduces the energy barriers for dehydration pathways. The most probable pathways for HCN and HNC generation are found to be dehydration of formamide in the T 1 state. Dehydration pathways from the neutral S 1 and protonated T 1 forms lead to stable complexes of HCN and HNC with water but are associated with large energy barriers. Overall, in the lower-lying excited states of either neutral or protonated formamide, dehydration is not competitive with homolytic C−N bond cleavages, which finally lead to formation of CO.
Physical Chemistry Chemical Physics, 2008
Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction bet... more Theoretical calculations at the MP2/6-311++G(2d,2p) level are used to analyze the interaction between HNZ (Z = O, S) and H 2 XNH 2 (X = B, Al). In the most stable conformation, the complexes are cyclic, the molecules being held together by conventional NHÁ Á ÁZ hydrogen bonds and by XHÁ Á ÁHN dihydrogen bonds. Binding energies including ZPE-and BSSE-corrections lie in the range 6.2-6.9 kJ mol À1 and there is little sensitivity to the nature of the X and Z atoms. In the XHÁ Á ÁHN dihydrogen bonds, the NH stretching vibrations are blue-shifted in the HNO complexes and red-shifted in the H 2 AlNH 2 -HNS complex. In the conventional NHÁ Á ÁZ hydrogen bonds, the NH stretching vibrations are red-shifted. The topological parameters at the bond critical point are in the usual range for hydrogen or dihydrogen bonds. A natural bond orbital analysis including the calculation of the atomic charges, hybridization, occupation of the antibonding orbitals and hyperconjugation energies shows that the shifts of the NH stretching vibrations in the conventional and dihydrogen bonds are mainly determined by the changes in occupation of the s*(NH) antibonding orbitals. The mechanism of intramolecular coupling is discussed and appears to be different for the HNO and HNS complexes. The analysis of all the theoretical data reveals that the NHÁ Á ÁZ bonds are stronger in the H 2 BNH 2 than in the H 2 AlNH 2 systems and that the XHÁ Á ÁHN dihydrogen bonds are stronger in the H 2 AlNH 2 than in the H 2 BNH 2 complexes. w Electronic supplementary information (ESI) available: Cartesian coordinates and energies including ZPE correction of monomers and complexes at the MP2/6-311++G(2d,2p) level of theory. See
Physical Chemistry Chemical Physics, 2009
The hydrogen-bonded complexes formed from interaction of trihalomethanes CHX(3) (X = F, Cl, Br) w... more The hydrogen-bonded complexes formed from interaction of trihalomethanes CHX(3) (X = F, Cl, Br) with nitrosyl hydride HNO were studied using ab initio MO calculations at the second-order perturbation theory (MP2/6-311++G(d,p)). Each interaction contains at least five separate equilibrium structures. Calculated binding energies range from 4 to 8 kJ mol(-1) with both ZPE and BSSE corrections. While CHBr(3) leads to the most stable complexes with HNO, CHF(3) forms the least stable counterparts. The strength of complexes thus tends to increase from F to Cl to Br, which is consistent with a decrease of deprotonation enthalpy of the corresponding C-H bonds. It is remarkable that all the C-H and N-H bonds are shortened upon complexation, giving rise to an increase of their stretching frequencies. A blue shift is thus observed for the N-H bonds of the type N-HX (X = F, Cl, Br); such a contraction of the covalent N-H bond is extremely rare.
Journal of Mineralogical and Petrological Sciences, 2007
... Nguyen Minh TRUNG *, **, Nguyen Dieu NUONG * and Tetsumaru ITAYA * ... Than, LV, Trung, NM, U... more ... Nguyen Minh TRUNG *, **, Nguyen Dieu NUONG * and Tetsumaru ITAYA * ... Than, LV, Trung, NM, Uy, ND, Hoc, NV, Thuat, TD, Manh, LV, Chinh, KC, Tuat, LT and Ngoc, D. (2000) Tectonics and Metallogeny of North Northern Central of Vietnam. ...
clrri.org
... 23: 2330) Duong TP, CN Diep, NT Khiem, NH Hiep, NV Toi, NY Lich, and LTK Nhan. 1984. ... Hai ... more ... 23: 2330) Duong TP, CN Diep, NT Khiem, NH Hiep, NV Toi, NY Lich, and LTK Nhan. 1984. ... Hai doìn g SB 83 vaìSB 177 khi âæåüc æïn g duûn g boïn phäúi håüp våïi 20 N (kg/ha) cuîng coïbiãøu hiãûn cäün g sinh täút trãn giäún g âáûu naìn h rau “VL 3”. Hai doìn g ...
International Journal of Refrigeration, 2008
Alloy Manganese a b s t r a c t Magnetic refrigeration employing magnetically ordered materials i... more Alloy Manganese a b s t r a c t Magnetic refrigeration employing magnetically ordered materials is a relatively novel technique, differing in some respects from magnetic cooling by means of adiabatic demagnetization of paramagnetic substances. Magnetic refrigeration has been known for more than a century and is based on the magnetocaloric effect. It has received new impetus recently because it has several advantages over vapor-compression refrigeration. In the last few years the magnetic and magnetocaloric properties of a large number of intermetallic compounds were investigated, in which the magnetic moments are carried by atoms of 3d transition elements. In the present paper we will focus on intermetallic compounds in which one of the components is Mn. The results obtained on several groups of such intermetallic compounds will be reviewed. By far the most promising materials of this group of intermetallics are compounds of the type MnFeP 1Àx As x . Although it is understood that these compounds are probably nontoxic, the presence of As atoms in them might form a mental barrier to exploit these materials on a commercial basis. Special attention will therefore be paid to efforts attempting to substitute other elements for As in MnFeP 1Àx As x with the proviso that the favorable magnetocaloric properties be retained. ª 2007 Elsevier Ltd and IIR. All rights reserved. Le point sur les maté riaux à base de Mn utilisé dans le froid magné tique : structure et proprié té s Mots clés : Ré frigé rateur magné tique ; Enquê te ; Proprié té magné tique ; Alliage ; Manganè se 1. (K.H.J. Buschow).
Chemical Physics Letters, 2014
Interactions of CO 2 with CH 3 SZCHX 2 (Z@O, S; X@H, CH 3 , F, Cl, Br) induce significantly stabl... more Interactions of CO 2 with CH 3 SZCHX 2 (Z@O, S; X@H, CH 3 , F, Cl, Br) induce significantly stable complexes with interaction energies from À13.7 to À16.4 kJ mol À1 (MP2/aug-cc-pVTZ//MP2/6-311++G(2d,2p)). Remarkably, some stable shapes of CH 3 SZCH 3 Á Á ÁCO 2 are revealed for the first time. Substitution of two H atoms in a CH 3 of CH 3 SZCH 3 by two X alike groups makes CH 3 SZCHX 2 Á Á ÁCO 2 more stable than CH 3 SZCH 3 Á Á ÁCO 2 , and their stability increases in the order F < Cl < Br < CH 3 . The >S@O is stronger than the >S@S in interacting with CO 2 , and they both can be valuable candidates in the design of CO 2 -philic materials and in the findings of materials to adsorb CO 2 .