Danh Nguyễn - Academia.edu (original) (raw)

Papers by Danh Nguyễn

Biodiversitas Journal of Biological Diversity

Curcuma sixsensesensis and Curcuma vinhlinhensis, two new species belonging to subgenus Ecomata f... more Curcuma sixsensesensis and Curcuma vinhlinhensis, two new species belonging to subgenus Ecomata from Coastal Central Vietnam, are described and illustrated in the present articles. The C. sixsensesensis easily gets confused with C. newmanii Škorničk. in compact rhizome; short lateral inflorescence composing of a few bracts; white corolla lobes and lateral staminodes; white labellum with a yellow mid-rid band but readily distinguished in rhomboid lateral staminodes (vs. obovate) with apex acuminated (vs. rounded); labellum 3-lobed (vs. emarginated), a mid-rid band being yellow at apex half, white at the base (vs. yellow throughout); anther crest presented (vs. reduced); oblong (lightly arching) (vs. L-shaped) anther in side view with slender and inward-pointing (vs. stout and outward-facing) spurs. The second one is similar to C. pambrosima Škorničk. & N. S. Lý in general habit and shape of the spike but differs in reduced ligule ca. 1 (vs. 4-5) mm long; lateral staminodes orange throughout (vs. yellow at apex, white at base), elliptic with round apex (vs. unequally ovate-rhomboid with acute apex); anther spurs elongate into the acute apex, outward-facing (vs. curved inward), ca. 2-3 (vs. ca. 1,5) mm long, anther crest reduced, up to 0.5 mm, 2-lobed (vs. prominent anther crest, ca. 1.5 mm apex round). Data for each described species comprises standard citation of type specimens, description, proposed species epithet etymology, data on ecology and distribution, and short taxonomic notes and morphological comparison of these new species with its allies species, a revised key to species of Curcuma subgen. Ecomata in Vietnam is included.

AGRIS on-line Papers in Economics and Informatics, Dec 30, 2022

The sustainable livelihoods framework (SLF) is a comprehensive way to study agricultural issues. ... more The sustainable livelihoods framework (SLF) is a comprehensive way to study agricultural issues. So far, to our best knowledge, no study has applied the SLF to examine the influence of land quality on land use intensively. The current research examines the effects of land quality on farmers' decision-making on land use in Vietnam by modifying the sustainable livelihoods framework and using the fixed effects regression model. The method controlled the household and commune-level unobserved invariant characteristics and resulted in more robust estimates than pooled Ordinary Least Squares (OLS) estimation. The sample is a five-wave panel dataset of 2008-2016 with 1,534 farm households. The results reveal that land quality affects land-use choices through several aspects of land quality. More specifically, regarding topography, plot fertility level, plot locations, and soil and water conservation, results show that their effects reflect the cultivating practices for each land-use type in the sample. Findings also show that the irrigation system positively affects rice production in Vietnam. Policymakers should consider various aspects of land quality when designing policies and programs relating to land use, irrigation distribution, and especially the master plan for agricultural production and rural development. Flexible guidance for land uses of each type is closely connected with land quality in each region that may be most suitable for sustainable agriculture development.

Communications in Physics, Jun 1, 2022

In this work, pyrolytic carbon electrodes were prepared through pyrolysis of wellpatterned AZ 150... more In this work, pyrolytic carbon electrodes were prepared through pyrolysis of wellpatterned AZ 1505 positive photoresist films. The designed electrodes firstly were prepared via photolithography technique, then the polymer was thermally broken-down into carbon skeletons in an oxygen-free environment using pyrolysis technique. The effect of the highest temperature and ramping rate on the electrical properties of the carbon films were investigated. The results show that the pyrolysis process was optimal at the ramping rate of 3˚C/minute, annealing temperature of 900˚C, and annealing time of one hour. The lowest resistivity was obtained at 6.3 × 10 −5 Ωm for pyrolytic films prepared at the optimal pyrolysis conditions. Electrochemical measurements confirm the potential of this electrode for electrochemical sensing applications.

Journal of Investigative Dermatology, May 1, 1990

arXiv (Cornell University), Nov 21, 2019

Emotion recognition or emotion prediction is a higher approach or a special case of sentiment ana... more Emotion recognition or emotion prediction is a higher approach or a special case of sentiment analysis. In this task, the result is not produced in terms of either polarity: positive or negative or in the form of rating (from 1 to 5) but of a more detailed level of analysis in which the results are depicted in more expressions like sadness, enjoyment, anger, disgust, fear and surprise. Emotion recognition plays a critical role in measuring brand value of a product by recognizing specific emotions of customers' comments. In this study, we have achieved two targets. First and foremost, we built a standard Vietnamese Social Media Emotion Corpus (UIT-VSMEC) with exactly 6,927 emotionannotated sentences, contributing to emotion recognition research in Vietnamese which is a low-resource language in natural language processing (NLP). Secondly, we assessed and measured machine learning and deep neural network models on our UIT-VSMEC corpus. As a result, the CNN model achieved the highest performance with the weighted F1-score of 59.74%. Our corpus is available at our research website 1 .

Inventions, Jan 9, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Lecture notes in networks and systems, Dec 2, 2022

Journal on Mathematics Education, 2021

Although Realistic Mathematics Education (RME) has become familiar to many mathematics teachers, ... more Although Realistic Mathematics Education (RME) has become familiar to many mathematics teachers, we still have little understanding of the extent to which mathematics teachers are willing to employ RME rather than traditional teaching approaches. Based on the theory of planned behavior, in conjunction with some other factors, including facilitating conditions and perceived autonomy, this study investigated a model explaining the continued intention of mathematics teachers to use Realistic Mathematics Education. A structural equation model was used to access data from an online survey involving 500 secondary school mathematics teachers in Vietnam. The results revealed that while attitude, perceived behavioral control and perceived autonomy have positive significant impacts on intention to use RME, it appears that subjective norms and facilitating conditions do not. These findings are of significance to stakeholders, including policymakers, school managers, and mathematics teachers.

European Journal of Engineering and Technology Research, 2019

Biofuel is a fuel made directly or indirectly from organic materials - biomass, consisting of two... more Biofuel is a fuel made directly or indirectly from organic materials - biomass, consisting of two main sources from plants and animal waste, not from fossil sources such as oil, coal. At present, biofuels account for about 20% of global energy consumption. Particularly there are some countries, the use of biofuels is even bigger, such as Germany, Brazil, India ..., these are the leading countries in proving the availability and superiority of biofuels. Because fossil energy reserves are declining rapidly, as well as their use which has many consequences for habitat, bioenergy is an inevitable development for the future. Some typical types of biofuels that are widely known today include: bioethanol (bioetanol), biodiesel (biodiesel), green diesel (diesel), biological kerosene (biokerosen-or reactive fuel). biological forces), other biological alcohols (methanol, butanol), bio ether, biogas, syngas, solid biomass fuels. In fact, the two most important biofuels are bioetanol and biodie...

European Journal of Engineering and Technology Research, 2019

In Vietnam, although quite modest, but since 1998, there have been investments in nanotechnology ... more In Vietnam, although quite modest, but since 1998, there have been investments in nanotechnology research. To date, many research results of nanotechnology application have been published in theory and experiment. Along with research units, the business sector also boldly applied nanotechnology in production. In this paper, the authors mention research, application, testing of fuel saving measures and emission reductions on diesel engines. It focuses on measures to improve fuel efficiency (including the use of emulsified fuels and the use of fuels containing nano-technology additives and especially the combination of the above two types) to test Control combustion in the direction of increasing capacity, saving fuel and reducing emissions. This measure has the same advantages as: it can be used on circulating engines without interfering with engine "hardware". The results contribute to the construction of technologies to produce renewable fuels from agricultural waste, to ...

Ocean & Coastal Management, 2021

Abstract Vulnerability assessments have suggested that many coastal cities are prone to the impac... more Abstract Vulnerability assessments have suggested that many coastal cities are prone to the impacts of flooding induced by sea level rise. This paper aims to understand the dynamics of flood adaptation in Ho Chi Minh City, which has been dealing with such issues for years due to its topography and ongoing urbanization-induced land subsidence. The results suggest that adaptation is reactive to the flooding – creating inconvenience to people's lives and focusing on a hard measures approach. Despite the high exposure to increased risks in the future, a large proportion of the population surveyed is unaware of sea-level rise and land subsidence in the area. Social conflicts regarding the interaction between formal and informal adaptation suggest the decoupling of the process at different levels and a lack of communication between the government and local communities. This case study, showing examples of reactive and decoupled formal and informal adaptation, can provide insights and lessons for vulnerable coastal cities elsewhere on the planet on how to adapt to sea level rise.

Vietnam Journal of Hydrometeorology, 2021

International Journal of Renewable Energy Development, 2021

Since the early years of the 21st century, the whole world has faced two very urgent problems: th... more Since the early years of the 21st century, the whole world has faced two very urgent problems: the depletion of fossil energy sources and climate change due to environmental pollution. Among the solutions sought, 2,5-Dimethylfuran (DMF) emerged as a promising solution. DMF is a 2nd generation biofuel capable of mass production from biomass. There have been many studies confirming that DMF is a potential alternative fuel for traditional fuels (gasoline and diesel) in internal combustion engines, contributing to solving the problem of energy security and environmental pollution. However, in order to apply DMF in practice, more comprehensive studies are needed. Not out of the above trend, this paper analyzes and discusses in detail the characteristics of DMF's combustible laminar flame and its instability under different initial conditions. The evaluation results show that the flame characteristics of DMF are similar to those of gasoline, although the burning rate of DMF is much hi...

European Journal of Engineering Research and Science, 2019

In the context of fossil fuel sources are gradually depleted, production and use of biofuels has ... more In the context of fossil fuel sources are gradually depleted, production and use of biofuels has become a popular trend in the world. In Vietnam, the development of biofuel production and use has been implemented since 2018. However, in order for this fuel to be widely used to contribute to environmental protection, there are still many obstacles.Among the alternative energy sources currently in use (wind, solar and nuclear energy), bioenergy is an inevitable development trend, especially in agricultural countries and imported. fuel, due to its benefits: production technology is not too complicated, utilizing local raw materials, increasing agricultural economic efficiency, without changing engine structure as well as lower facilities Existing floors and competitive prices compared to gasoline.Increasing the use of biofuels is not only about protecting the environment but also contributing to the positive transformation of the lives of people in remote areas of the country.

Background Amoxicillin resistant Helicobacter pylori (H. pylori) strains seem to have increased o... more Background Amoxicillin resistant Helicobacter pylori (H. pylori) strains seem to have increased over time in Vietnam. This threatens the effectiveness of H. pylori eradication therapies with this antibiotic. This study aimed to investigate the prevalence of primary resistance of H. pylori to amoxicillin and to assess its association with pbp1A point mutations in Vietnamese patients. Materials and Methods Naive patients who presented with dyspepsia undergoing upper gastrointestinal endoscopy were recruited. Rapid urease tests and PCR assays were used to diagnose H. pylori infection. Amoxicillin susceptibility was examined by E-tests. Molecular detection of the mutant pbp1A gene conferring amoxicillin resistance was carried out by real-time PCR followed by direct sequencing of the PCR products. Phylogenetic analyses were performed using the Tamura-Nei genetic distance model and the neighbour-joining tree building method. Results There were 308 patients (46.1% men and 53.9% women, p = ...

Journal of Energy Resources Technology, 2020

Currently, the supply of diminishing fossil fuel reserves, and the rise in challenges in environm... more Currently, the supply of diminishing fossil fuel reserves, and the rise in challenges in environmental, political and economic consequences have caused the great concerns in the development of modern society; these have forced the policy-makers and researchers to look for the renewable and green energy sources. Deemed as a promising renewable alternative to traditional fossil fuels, 2,5-dimethylfuran (DMF, chemical formula C6H8O)—a derivative of furan—has the potential to relieve the growing shortage of fossil fuels while satisfying the increase in global energy demand and minimizing the adverse effects of climate change. DMF can be used as a clean source of liquid transportation biofuel given the fact that it is directly obtained from biomass-derived carbohydrates. In reviewing current DMF production methods, this review paper analyzes and presents the comparison of catalytic performance in the conversion of biomass into DMF. In addition, the applicability of DMF in spark-ignition ...

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020

In recent years, 2,5-dimethylfuran (DMF) has been seen as a potential chemical substance in repla... more In recent years, 2,5-dimethylfuran (DMF) has been seen as a potential chemical substance in replacing the traditional petroleum because their physicochemical properties have many similarities with ...

PROCEEDINGS OF THE 2020 2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE MANUFACTURING, MATERIALS AND TECHNOLOGIES, 2020

Phytotaxa, 2019

The genus Aspidistra Ker-Gawler (1822 plate 628), overlooked for decades, is recently remarkably ... more The genus Aspidistra Ker-Gawler (1822 plate 628), overlooked for decades, is recently remarkably fast growing. During the past decade, about 90 species new to science were discovered and described, mainly from southern China, Vietnam, and Laos. With its diversity in flower morphology Aspidistra is among the most spectacular genera of Monocotyledons. Vietnam turned out to be especially rich in Aspidistra species (Tillich 2014), and at, least 30 additional species were discovered and described recently in this country (Averyanov & Tillich 2014, 2015, 2016, 2017, Leong-Skornickova et al. 2014, Vislobokov et al. 2014a, b, 2016a, b, 2017, Vislobokov 2015, 2016, Olivier 2015, Averyanov et al. 2016, 2017, 2018a, b, Nguyen et al. 2017, Tillich et al. 2017, Tillich & Averyanov 2018). Meanwhile, the diversity of the genus in Vietnam remains insufficiently inventoried. Below we describe three more new species from central Vietnam.

European Journal of Engineering Research and Science, 2019

According to Shipbuilding Industry Corporation (SBIC), in 2017, shipbuilding value reached more t... more According to Shipbuilding Industry Corporation (SBIC), in 2017, shipbuilding value reached more than VND 3,071 billion, equal to 69% of the plan. Other fields have increased significantly, such as: Ship repair reached VND 488.3 billion, equal to 125% of the plan; supporting industry reached VND 264.5 billion, equal to 123% of the plan. Although shipbuilding has not reached the plan, but looking back on the period from 2008 to now, this field is always in a situation of hardship and bottomless decline because of lack of jobs, these are quite satisfactory numbers. The cause of the decline is due to the world shipping and shipbuilding industry has experienced an extremely difficult period due to the heavy influence of the world economic crisis from 2008 up to now. The Vietnamese shipbuilding and shipping industry is also not out of that situation. For the shipbuilding industry to develop, specific policies, with specific support addresses, are needed, which are well-designed and vision...

Biodiversitas Journal of Biological Diversity

Curcuma sixsensesensis and Curcuma vinhlinhensis, two new species belonging to subgenus Ecomata f... more Curcuma sixsensesensis and Curcuma vinhlinhensis, two new species belonging to subgenus Ecomata from Coastal Central Vietnam, are described and illustrated in the present articles. The C. sixsensesensis easily gets confused with C. newmanii Škorničk. in compact rhizome; short lateral inflorescence composing of a few bracts; white corolla lobes and lateral staminodes; white labellum with a yellow mid-rid band but readily distinguished in rhomboid lateral staminodes (vs. obovate) with apex acuminated (vs. rounded); labellum 3-lobed (vs. emarginated), a mid-rid band being yellow at apex half, white at the base (vs. yellow throughout); anther crest presented (vs. reduced); oblong (lightly arching) (vs. L-shaped) anther in side view with slender and inward-pointing (vs. stout and outward-facing) spurs. The second one is similar to C. pambrosima Škorničk. & N. S. Lý in general habit and shape of the spike but differs in reduced ligule ca. 1 (vs. 4-5) mm long; lateral staminodes orange throughout (vs. yellow at apex, white at base), elliptic with round apex (vs. unequally ovate-rhomboid with acute apex); anther spurs elongate into the acute apex, outward-facing (vs. curved inward), ca. 2-3 (vs. ca. 1,5) mm long, anther crest reduced, up to 0.5 mm, 2-lobed (vs. prominent anther crest, ca. 1.5 mm apex round). Data for each described species comprises standard citation of type specimens, description, proposed species epithet etymology, data on ecology and distribution, and short taxonomic notes and morphological comparison of these new species with its allies species, a revised key to species of Curcuma subgen. Ecomata in Vietnam is included.

AGRIS on-line Papers in Economics and Informatics, Dec 30, 2022

The sustainable livelihoods framework (SLF) is a comprehensive way to study agricultural issues. ... more The sustainable livelihoods framework (SLF) is a comprehensive way to study agricultural issues. So far, to our best knowledge, no study has applied the SLF to examine the influence of land quality on land use intensively. The current research examines the effects of land quality on farmers' decision-making on land use in Vietnam by modifying the sustainable livelihoods framework and using the fixed effects regression model. The method controlled the household and commune-level unobserved invariant characteristics and resulted in more robust estimates than pooled Ordinary Least Squares (OLS) estimation. The sample is a five-wave panel dataset of 2008-2016 with 1,534 farm households. The results reveal that land quality affects land-use choices through several aspects of land quality. More specifically, regarding topography, plot fertility level, plot locations, and soil and water conservation, results show that their effects reflect the cultivating practices for each land-use type in the sample. Findings also show that the irrigation system positively affects rice production in Vietnam. Policymakers should consider various aspects of land quality when designing policies and programs relating to land use, irrigation distribution, and especially the master plan for agricultural production and rural development. Flexible guidance for land uses of each type is closely connected with land quality in each region that may be most suitable for sustainable agriculture development.

Communications in Physics, Jun 1, 2022

In this work, pyrolytic carbon electrodes were prepared through pyrolysis of wellpatterned AZ 150... more In this work, pyrolytic carbon electrodes were prepared through pyrolysis of wellpatterned AZ 1505 positive photoresist films. The designed electrodes firstly were prepared via photolithography technique, then the polymer was thermally broken-down into carbon skeletons in an oxygen-free environment using pyrolysis technique. The effect of the highest temperature and ramping rate on the electrical properties of the carbon films were investigated. The results show that the pyrolysis process was optimal at the ramping rate of 3˚C/minute, annealing temperature of 900˚C, and annealing time of one hour. The lowest resistivity was obtained at 6.3 × 10 −5 Ωm for pyrolytic films prepared at the optimal pyrolysis conditions. Electrochemical measurements confirm the potential of this electrode for electrochemical sensing applications.

Journal of Investigative Dermatology, May 1, 1990

arXiv (Cornell University), Nov 21, 2019

Emotion recognition or emotion prediction is a higher approach or a special case of sentiment ana... more Emotion recognition or emotion prediction is a higher approach or a special case of sentiment analysis. In this task, the result is not produced in terms of either polarity: positive or negative or in the form of rating (from 1 to 5) but of a more detailed level of analysis in which the results are depicted in more expressions like sadness, enjoyment, anger, disgust, fear and surprise. Emotion recognition plays a critical role in measuring brand value of a product by recognizing specific emotions of customers' comments. In this study, we have achieved two targets. First and foremost, we built a standard Vietnamese Social Media Emotion Corpus (UIT-VSMEC) with exactly 6,927 emotionannotated sentences, contributing to emotion recognition research in Vietnamese which is a low-resource language in natural language processing (NLP). Secondly, we assessed and measured machine learning and deep neural network models on our UIT-VSMEC corpus. As a result, the CNN model achieved the highest performance with the weighted F1-score of 59.74%. Our corpus is available at our research website 1 .

Inventions, Jan 9, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Lecture notes in networks and systems, Dec 2, 2022

Journal on Mathematics Education, 2021

Although Realistic Mathematics Education (RME) has become familiar to many mathematics teachers, ... more Although Realistic Mathematics Education (RME) has become familiar to many mathematics teachers, we still have little understanding of the extent to which mathematics teachers are willing to employ RME rather than traditional teaching approaches. Based on the theory of planned behavior, in conjunction with some other factors, including facilitating conditions and perceived autonomy, this study investigated a model explaining the continued intention of mathematics teachers to use Realistic Mathematics Education. A structural equation model was used to access data from an online survey involving 500 secondary school mathematics teachers in Vietnam. The results revealed that while attitude, perceived behavioral control and perceived autonomy have positive significant impacts on intention to use RME, it appears that subjective norms and facilitating conditions do not. These findings are of significance to stakeholders, including policymakers, school managers, and mathematics teachers.

European Journal of Engineering and Technology Research, 2019

Biofuel is a fuel made directly or indirectly from organic materials - biomass, consisting of two... more Biofuel is a fuel made directly or indirectly from organic materials - biomass, consisting of two main sources from plants and animal waste, not from fossil sources such as oil, coal. At present, biofuels account for about 20% of global energy consumption. Particularly there are some countries, the use of biofuels is even bigger, such as Germany, Brazil, India ..., these are the leading countries in proving the availability and superiority of biofuels. Because fossil energy reserves are declining rapidly, as well as their use which has many consequences for habitat, bioenergy is an inevitable development for the future. Some typical types of biofuels that are widely known today include: bioethanol (bioetanol), biodiesel (biodiesel), green diesel (diesel), biological kerosene (biokerosen-or reactive fuel). biological forces), other biological alcohols (methanol, butanol), bio ether, biogas, syngas, solid biomass fuels. In fact, the two most important biofuels are bioetanol and biodie...

European Journal of Engineering and Technology Research, 2019

In Vietnam, although quite modest, but since 1998, there have been investments in nanotechnology ... more In Vietnam, although quite modest, but since 1998, there have been investments in nanotechnology research. To date, many research results of nanotechnology application have been published in theory and experiment. Along with research units, the business sector also boldly applied nanotechnology in production. In this paper, the authors mention research, application, testing of fuel saving measures and emission reductions on diesel engines. It focuses on measures to improve fuel efficiency (including the use of emulsified fuels and the use of fuels containing nano-technology additives and especially the combination of the above two types) to test Control combustion in the direction of increasing capacity, saving fuel and reducing emissions. This measure has the same advantages as: it can be used on circulating engines without interfering with engine "hardware". The results contribute to the construction of technologies to produce renewable fuels from agricultural waste, to ...

Ocean & Coastal Management, 2021

Abstract Vulnerability assessments have suggested that many coastal cities are prone to the impac... more Abstract Vulnerability assessments have suggested that many coastal cities are prone to the impacts of flooding induced by sea level rise. This paper aims to understand the dynamics of flood adaptation in Ho Chi Minh City, which has been dealing with such issues for years due to its topography and ongoing urbanization-induced land subsidence. The results suggest that adaptation is reactive to the flooding – creating inconvenience to people's lives and focusing on a hard measures approach. Despite the high exposure to increased risks in the future, a large proportion of the population surveyed is unaware of sea-level rise and land subsidence in the area. Social conflicts regarding the interaction between formal and informal adaptation suggest the decoupling of the process at different levels and a lack of communication between the government and local communities. This case study, showing examples of reactive and decoupled formal and informal adaptation, can provide insights and lessons for vulnerable coastal cities elsewhere on the planet on how to adapt to sea level rise.

Vietnam Journal of Hydrometeorology, 2021

International Journal of Renewable Energy Development, 2021

Since the early years of the 21st century, the whole world has faced two very urgent problems: th... more Since the early years of the 21st century, the whole world has faced two very urgent problems: the depletion of fossil energy sources and climate change due to environmental pollution. Among the solutions sought, 2,5-Dimethylfuran (DMF) emerged as a promising solution. DMF is a 2nd generation biofuel capable of mass production from biomass. There have been many studies confirming that DMF is a potential alternative fuel for traditional fuels (gasoline and diesel) in internal combustion engines, contributing to solving the problem of energy security and environmental pollution. However, in order to apply DMF in practice, more comprehensive studies are needed. Not out of the above trend, this paper analyzes and discusses in detail the characteristics of DMF's combustible laminar flame and its instability under different initial conditions. The evaluation results show that the flame characteristics of DMF are similar to those of gasoline, although the burning rate of DMF is much hi...

European Journal of Engineering Research and Science, 2019

In the context of fossil fuel sources are gradually depleted, production and use of biofuels has ... more In the context of fossil fuel sources are gradually depleted, production and use of biofuels has become a popular trend in the world. In Vietnam, the development of biofuel production and use has been implemented since 2018. However, in order for this fuel to be widely used to contribute to environmental protection, there are still many obstacles.Among the alternative energy sources currently in use (wind, solar and nuclear energy), bioenergy is an inevitable development trend, especially in agricultural countries and imported. fuel, due to its benefits: production technology is not too complicated, utilizing local raw materials, increasing agricultural economic efficiency, without changing engine structure as well as lower facilities Existing floors and competitive prices compared to gasoline.Increasing the use of biofuels is not only about protecting the environment but also contributing to the positive transformation of the lives of people in remote areas of the country.

Background Amoxicillin resistant Helicobacter pylori (H. pylori) strains seem to have increased o... more Background Amoxicillin resistant Helicobacter pylori (H. pylori) strains seem to have increased over time in Vietnam. This threatens the effectiveness of H. pylori eradication therapies with this antibiotic. This study aimed to investigate the prevalence of primary resistance of H. pylori to amoxicillin and to assess its association with pbp1A point mutations in Vietnamese patients. Materials and Methods Naive patients who presented with dyspepsia undergoing upper gastrointestinal endoscopy were recruited. Rapid urease tests and PCR assays were used to diagnose H. pylori infection. Amoxicillin susceptibility was examined by E-tests. Molecular detection of the mutant pbp1A gene conferring amoxicillin resistance was carried out by real-time PCR followed by direct sequencing of the PCR products. Phylogenetic analyses were performed using the Tamura-Nei genetic distance model and the neighbour-joining tree building method. Results There were 308 patients (46.1% men and 53.9% women, p = ...

Journal of Energy Resources Technology, 2020

Currently, the supply of diminishing fossil fuel reserves, and the rise in challenges in environm... more Currently, the supply of diminishing fossil fuel reserves, and the rise in challenges in environmental, political and economic consequences have caused the great concerns in the development of modern society; these have forced the policy-makers and researchers to look for the renewable and green energy sources. Deemed as a promising renewable alternative to traditional fossil fuels, 2,5-dimethylfuran (DMF, chemical formula C6H8O)—a derivative of furan—has the potential to relieve the growing shortage of fossil fuels while satisfying the increase in global energy demand and minimizing the adverse effects of climate change. DMF can be used as a clean source of liquid transportation biofuel given the fact that it is directly obtained from biomass-derived carbohydrates. In reviewing current DMF production methods, this review paper analyzes and presents the comparison of catalytic performance in the conversion of biomass into DMF. In addition, the applicability of DMF in spark-ignition ...

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020

In recent years, 2,5-dimethylfuran (DMF) has been seen as a potential chemical substance in repla... more In recent years, 2,5-dimethylfuran (DMF) has been seen as a potential chemical substance in replacing the traditional petroleum because their physicochemical properties have many similarities with ...

PROCEEDINGS OF THE 2020 2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE MANUFACTURING, MATERIALS AND TECHNOLOGIES, 2020

Phytotaxa, 2019

The genus Aspidistra Ker-Gawler (1822 plate 628), overlooked for decades, is recently remarkably ... more The genus Aspidistra Ker-Gawler (1822 plate 628), overlooked for decades, is recently remarkably fast growing. During the past decade, about 90 species new to science were discovered and described, mainly from southern China, Vietnam, and Laos. With its diversity in flower morphology Aspidistra is among the most spectacular genera of Monocotyledons. Vietnam turned out to be especially rich in Aspidistra species (Tillich 2014), and at, least 30 additional species were discovered and described recently in this country (Averyanov & Tillich 2014, 2015, 2016, 2017, Leong-Skornickova et al. 2014, Vislobokov et al. 2014a, b, 2016a, b, 2017, Vislobokov 2015, 2016, Olivier 2015, Averyanov et al. 2016, 2017, 2018a, b, Nguyen et al. 2017, Tillich et al. 2017, Tillich & Averyanov 2018). Meanwhile, the diversity of the genus in Vietnam remains insufficiently inventoried. Below we describe three more new species from central Vietnam.

European Journal of Engineering Research and Science, 2019

According to Shipbuilding Industry Corporation (SBIC), in 2017, shipbuilding value reached more t... more According to Shipbuilding Industry Corporation (SBIC), in 2017, shipbuilding value reached more than VND 3,071 billion, equal to 69% of the plan. Other fields have increased significantly, such as: Ship repair reached VND 488.3 billion, equal to 125% of the plan; supporting industry reached VND 264.5 billion, equal to 123% of the plan. Although shipbuilding has not reached the plan, but looking back on the period from 2008 to now, this field is always in a situation of hardship and bottomless decline because of lack of jobs, these are quite satisfactory numbers. The cause of the decline is due to the world shipping and shipbuilding industry has experienced an extremely difficult period due to the heavy influence of the world economic crisis from 2008 up to now. The Vietnamese shipbuilding and shipping industry is also not out of that situation. For the shipbuilding industry to develop, specific policies, with specific support addresses, are needed, which are well-designed and vision...