Substituted N-propargyl isatins were synthesized by S N 2 reaction of corresponding substituted i... more Substituted N-propargyl isatins were synthesized by S N 2 reaction of corresponding substituted isatins with propargyl bromide in the presence of anhydrous K 2 CO 3 as base. We reported about study on systematically synthesis of these compounds using heating procedures under different reaction conditions, including microwave-assisted heating conditions at power of 100 W (Procedure A), conventional heating conditions in water bath at 50 °C in acetonitrile (Procedure B), and conventional heating conditions in water bath at 50 °C in DMF (procedure C). The best procedure A was deduced based on the investigations on the reaction conditions. Almost all substituted N-propargyl isatins were new, except compounds with R of H, 5-Me, 5-Cl and 5-Br substituents. The structures of the obtained compounds were confirmed by the modern spectroscopic methods.
Reaction of different substituted 2-chloro-4-methylquinolines with sodium azide changed the direc... more Reaction of different substituted 2-chloro-4-methylquinolines with sodium azide changed the direction to substituted tetrazolo[1,5-a]quinolines instead corresponding 2-azido-4-methylquinolines. Required 2-chloro-derivatives were obtained from substituted 4-methylquinolin-2(1H)-ones, which were synthesized by ring closing corresponding (un)substituted acetoacetanildes in the presence of ionic liquid [Bmim]OH. The structures of obtained compounds have been confirmed by using spectroscopic methods (IR, NMR and MS).
European Journal of Medical and Health Sciences, 2020
Athletes’s anterior cruciate ligament (ACL) injury in Vietnam is very common and tends to increas... more Athletes’s anterior cruciate ligament (ACL) injury in Vietnam is very common and tends to increase rapidly in the number of cases as well as the cost of treatment. Therefore, it is necessary to study effective treatments for these types of trauma. This article shows that patients who have had ACL reconstruction surgery in Ho Chi Minh City (Vietnam) had a quite large success rate of 75-95% and their recovery results were very good after ligament reconstruction surgery.
Scientific and Technical Information Processing, 2018
⎯A subject area is analyzed and the topicality of the problem of face recognition is shown. Metho... more ⎯A subject area is analyzed and the topicality of the problem of face recognition is shown. Methods for matching images by applying position lines, convolutions and invariants to the group of affine transformation for 2D and 3D images are examined. Proper comparison is a necessary condition for solving the recognition problem. Proper use of the position-line method for reducing face images to the normalized form is shown.
Proceedings of The 22nd International Electronic Conference on Synthetic Organic Chemistry, 2018
An efficient and simple synthesis of substituted 2-amino-4H-chromene-3-carbonitriles was develope... more An efficient and simple synthesis of substituted 2-amino-4H-chromene-3-carbonitriles was developed by the one-pot and three-component reaction of a mixture of corresponding substituted benzaldehydes, resorcinol, and malononitrile in the presence of sodium carbonate solution as a catalyst at room temperature.
Proceedings of The 19th International Electronic Conference on Synthetic Organic Chemistry, 2015
Reaction of substituted acetophenone (hepta-O-acetyl-β-maltosyl)thiosemicarbazones with ethyl bro... more Reaction of substituted acetophenone (hepta-O-acetyl-β-maltosyl)thiosemicarbazones with ethyl bromoacetate was investigated. It's indicated that the nature of solvents and the catalysts affected the reaction yields, and that the microwave-assisted heating method gave higher yields of products than the conventional heating one. Based on the optimum conditions, ionic liquid [HOCH2CH2NH3 + ]-OAc, dried chloroform and microwave-assisted heating, the synthesis of some 2-iminothiazolidin-4-ones containg maltose moiety were synthesized. Their structure have been confirmed by spectral data (FTIR, 1 H NMR, 13 C NMR and MS).
Some 2-amino-4,6-diarylpyrimidines 2 have been prepared from substituted benzylideneacetophenones... more Some 2-amino-4,6-diarylpyrimidines 2 have been prepared from substituted benzylideneacetophenones and guanidine hydrochloride in the presence of alkali by conventional heating in alcoholic medium and microwave heating in solvent-free conditions. N-(2,3,4,6-Tetra-O-acetyl-β-dglucopyranosyl)-N′-(4′,6′-diarylpyrimidin-2′-yl)thioureas 4 have been synthesized by reaction of per-Oacetylated glucopyranosyl isothiocyanate 1 and substituted 2-amino-4,6-diarylpyrimidines 2. Two different methods have been used, namely, refluxing in anhydrous dioxane and solvent-free microwave-assisted coupling. The second procedure afforded higher yields in much shorter reaction times. The compounds 2 and 4 were tested for their antibacterial and antifungal activities in vitro against Staphylococcus epidermidis, Enterobacter aerogenes and Candida albicans by disc diffusion method.
The article investigates the current situation of the student behavior management capacity of jun... more The article investigates the current situation of the student behavior management capacity of junior high school teachers in Da Nang city. The study was conducted on 490 teachers at 7 secondary schools in Da Nang city on 3 aspects of student behavior management capacity including teacher's perception of student behavior management; student behavior management skills; attitude of teachers in the management of student behavior. The results show that the capacity of junior high school teachers to manage student behavior in Da Nang city is still limited. This result is the basis for proposing measures to improve the behavior management capacity for teachers; thereby improving the quality and effectiveness of teaching and educational activities.
We in this paper exploit time series algorithm based deep learning in forecasting damage mechanic... more We in this paper exploit time series algorithm based deep learning in forecasting damage mechanics problems. The methodologies that are able to work accurately for less computational and resolving attempts are a significant demand nowadays. Relied on learning an amount of information from given data, the long short-term memory (LSTM) method and multi-layer neural networks (MNN) method are applied to predict solutions. Numerical examples are implemented for predicting fracture growth rates of L-shape concrete specimen under load ratio, single-edge-notched beam forced by 4-point shear and hydraulic fracturing in permeable porous media problems such as storage-toughness fracture regime and fracture-height growth in Marcellus shale. The predicted results by deep learning algorithms are well-agreed with experimental data.
Based on the assessment of teaching and students' current state of calculating capacity in ch... more Based on the assessment of teaching and students' current state of calculating capacity in chess classes, the topic has selected a number of tactical coordination exercises to improve the calculating capacity for students of chess classes at Ho Chi Minh City University of Technology and Education (HCMC UTE). Thereby, indirectly support students to study well other subjects in the school's general curriculum.
Overall research on the current situation such as: Physical education subject program; Documents ... more Overall research on the current situation such as: Physical education subject program; Documents and textbooks for teaching and learning; Teaching staff; Methods for teaching; Testing and evaluation; Facilities, grounds, learning conditions; Extracurricular Activities; The concern of the university leadership towards physical education; Collaboration between physical education faculty members and departments; Satisfaction level of both lecturers and students, etc. to discover the limitations and propose effective improvement solutions.
Substituted N-propargyl isatins were synthesized by S N 2 reaction of corresponding substituted i... more Substituted N-propargyl isatins were synthesized by S N 2 reaction of corresponding substituted isatins with propargyl bromide in the presence of anhydrous K 2 CO 3 as base. We reported about study on systematically synthesis of these compounds using heating procedures under different reaction conditions, including microwave-assisted heating conditions at power of 100 W (Procedure A), conventional heating conditions in water bath at 50 °C in acetonitrile (Procedure B), and conventional heating conditions in water bath at 50 °C in DMF (procedure C). The best procedure A was deduced based on the investigations on the reaction conditions. Almost all substituted N-propargyl isatins were new, except compounds with R of H, 5-Me, 5-Cl and 5-Br substituents. The structures of the obtained compounds were confirmed by the modern spectroscopic methods.
Reaction of different substituted 2-chloro-4-methylquinolines with sodium azide changed the direc... more Reaction of different substituted 2-chloro-4-methylquinolines with sodium azide changed the direction to substituted tetrazolo[1,5-a]quinolines instead corresponding 2-azido-4-methylquinolines. Required 2-chloro-derivatives were obtained from substituted 4-methylquinolin-2(1H)-ones, which were synthesized by ring closing corresponding (un)substituted acetoacetanildes in the presence of ionic liquid [Bmim]OH. The structures of obtained compounds have been confirmed by using spectroscopic methods (IR, NMR and MS).
European Journal of Medical and Health Sciences, 2020
Athletes’s anterior cruciate ligament (ACL) injury in Vietnam is very common and tends to increas... more Athletes’s anterior cruciate ligament (ACL) injury in Vietnam is very common and tends to increase rapidly in the number of cases as well as the cost of treatment. Therefore, it is necessary to study effective treatments for these types of trauma. This article shows that patients who have had ACL reconstruction surgery in Ho Chi Minh City (Vietnam) had a quite large success rate of 75-95% and their recovery results were very good after ligament reconstruction surgery.
Scientific and Technical Information Processing, 2018
⎯A subject area is analyzed and the topicality of the problem of face recognition is shown. Metho... more ⎯A subject area is analyzed and the topicality of the problem of face recognition is shown. Methods for matching images by applying position lines, convolutions and invariants to the group of affine transformation for 2D and 3D images are examined. Proper comparison is a necessary condition for solving the recognition problem. Proper use of the position-line method for reducing face images to the normalized form is shown.
Proceedings of The 22nd International Electronic Conference on Synthetic Organic Chemistry, 2018
An efficient and simple synthesis of substituted 2-amino-4H-chromene-3-carbonitriles was develope... more An efficient and simple synthesis of substituted 2-amino-4H-chromene-3-carbonitriles was developed by the one-pot and three-component reaction of a mixture of corresponding substituted benzaldehydes, resorcinol, and malononitrile in the presence of sodium carbonate solution as a catalyst at room temperature.
Proceedings of The 19th International Electronic Conference on Synthetic Organic Chemistry, 2015
Reaction of substituted acetophenone (hepta-O-acetyl-β-maltosyl)thiosemicarbazones with ethyl bro... more Reaction of substituted acetophenone (hepta-O-acetyl-β-maltosyl)thiosemicarbazones with ethyl bromoacetate was investigated. It's indicated that the nature of solvents and the catalysts affected the reaction yields, and that the microwave-assisted heating method gave higher yields of products than the conventional heating one. Based on the optimum conditions, ionic liquid [HOCH2CH2NH3 + ]-OAc, dried chloroform and microwave-assisted heating, the synthesis of some 2-iminothiazolidin-4-ones containg maltose moiety were synthesized. Their structure have been confirmed by spectral data (FTIR, 1 H NMR, 13 C NMR and MS).
Some 2-amino-4,6-diarylpyrimidines 2 have been prepared from substituted benzylideneacetophenones... more Some 2-amino-4,6-diarylpyrimidines 2 have been prepared from substituted benzylideneacetophenones and guanidine hydrochloride in the presence of alkali by conventional heating in alcoholic medium and microwave heating in solvent-free conditions. N-(2,3,4,6-Tetra-O-acetyl-β-dglucopyranosyl)-N′-(4′,6′-diarylpyrimidin-2′-yl)thioureas 4 have been synthesized by reaction of per-Oacetylated glucopyranosyl isothiocyanate 1 and substituted 2-amino-4,6-diarylpyrimidines 2. Two different methods have been used, namely, refluxing in anhydrous dioxane and solvent-free microwave-assisted coupling. The second procedure afforded higher yields in much shorter reaction times. The compounds 2 and 4 were tested for their antibacterial and antifungal activities in vitro against Staphylococcus epidermidis, Enterobacter aerogenes and Candida albicans by disc diffusion method.
The article investigates the current situation of the student behavior management capacity of jun... more The article investigates the current situation of the student behavior management capacity of junior high school teachers in Da Nang city. The study was conducted on 490 teachers at 7 secondary schools in Da Nang city on 3 aspects of student behavior management capacity including teacher's perception of student behavior management; student behavior management skills; attitude of teachers in the management of student behavior. The results show that the capacity of junior high school teachers to manage student behavior in Da Nang city is still limited. This result is the basis for proposing measures to improve the behavior management capacity for teachers; thereby improving the quality and effectiveness of teaching and educational activities.
We in this paper exploit time series algorithm based deep learning in forecasting damage mechanic... more We in this paper exploit time series algorithm based deep learning in forecasting damage mechanics problems. The methodologies that are able to work accurately for less computational and resolving attempts are a significant demand nowadays. Relied on learning an amount of information from given data, the long short-term memory (LSTM) method and multi-layer neural networks (MNN) method are applied to predict solutions. Numerical examples are implemented for predicting fracture growth rates of L-shape concrete specimen under load ratio, single-edge-notched beam forced by 4-point shear and hydraulic fracturing in permeable porous media problems such as storage-toughness fracture regime and fracture-height growth in Marcellus shale. The predicted results by deep learning algorithms are well-agreed with experimental data.
Based on the assessment of teaching and students' current state of calculating capacity in ch... more Based on the assessment of teaching and students' current state of calculating capacity in chess classes, the topic has selected a number of tactical coordination exercises to improve the calculating capacity for students of chess classes at Ho Chi Minh City University of Technology and Education (HCMC UTE). Thereby, indirectly support students to study well other subjects in the school's general curriculum.
Overall research on the current situation such as: Physical education subject program; Documents ... more Overall research on the current situation such as: Physical education subject program; Documents and textbooks for teaching and learning; Teaching staff; Methods for teaching; Testing and evaluation; Facilities, grounds, learning conditions; Extracurricular Activities; The concern of the university leadership towards physical education; Collaboration between physical education faculty members and departments; Satisfaction level of both lecturers and students, etc. to discover the limitations and propose effective improvement solutions.
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