Vietnam Journal of Science and Technology
ACI
2815-5874
Cơ quản chủ quản: N/A
Phân tích ảnh hưởng
Các bài báo tiêu biểu
Finite element modelling for free vibration response of cracked stiffened FGM plates
Tập 58 Số 1 - Trang 119-129 - 2020
This paper presents the new numerical results of vibration response analysis of
cracked FGM plate based on phase-field theory and finite element method. Effects
of geometrical and material properties on the vibration behaviors of the plate
are investigated in this work. The computed results show that the crack and
stiffener have a strong influence on both the vibration responses and vibration
mode...
#finite element #phase-field theory #FGM #crack #stiffened plates #vibration
EFFECT OF NANOSILICA FROM RICE HUSK ON THE GROWTH ENHANCEMENT OF CHILI PLANT (Capsicum frutescens L.)
Tập 54 Số 5 - Trang 607 - 2023
Nanomaterials hold great promise of improved plant disease resistance,
controlled release of agro-chemicals, enhanced plant growth, etc. In this study,
the effect of nanosilica (10 – 30 nm) prepared from rice husk on the growth
promotion of chili plant in green house was carried out. The experiment of
nanosilica treatment by foliar spraying was arranged in a factorial design with
3 replications at...
#Nanosilica #rice husk #growth #chili plant
Membrane distillation for seawater desalination applications in Vietnam: potential and challenges
Tập 55 Số 6 - Trang 659-682 - 2017
Desalination of seawater using membrane distillation (MD) can be a practical
approach to mitigating the fresh water scarcity in Vietnam. This paper provides
a comprehensive review of the seawater MD desalination process. The fundamentals
of the MD process including configurations, membrane modules, membrane
properties, and heat and mass transfer mechanisms together with approaches to
enhancing hea...
#membrane distillation #seawater desalination #fresh water scarcity #desalination processes
Analytical solutions for bending, buckling and vibration analysis of functionally graded cylindrical panel
Tập 55 Số 5 - Trang 587-597 - 2017
The main purpose of this article is to present analytical solutions for bending,
buckling and vibration analysis of cylindrical panel, which are composed of
functionally graded materials (FGMs). Equations of motion are derived using
Hamilton’s principle. The first-order shear deformation theory is used for
developing Navier’s solutions of simply supported cylindrical panel. Comparison
studies are ...
#functionally graded cylindrical shell #shear deformation theory #bending #buckling #vibration
Phenolic compounds from Callistemon citrinus leaves and stems
Tập 54 Số 2 - Trang 190-197 - 2016
In the search for bioactive constituents from Vietnamese plants, the leaves and
stems of Callistemon citrinus (Curtis) Skeels were selected for chemical
investigation. Phytochemical analysis of plant led to the isolation of eight
phenolic compounds including two flavonoids (eucalyptine (1) and
8-demethyleucalyptine (2)), two alcohols (blumenol A (3), n-tetratriacontanol
(4)), three benzoic acid d...
#Callistemon citrinus #flavonoid #triterpenoid.
Chemical and pharmacological evaluation of Manglicolous lichen Graphis ajarekarii PATW. & C. R. KULK.
Tập 57 Số 3 - Trang 300-308 - 2019
The chemical examination of ethanolic extract of manglicolous lichen Graphis
ajarekarii (Ga-Et) resulted in isolation of three known metabolites –
chiodectonic acid (1), graphenone (2) and graphisquinone (3). All the isolates
(1-3) and Ga-Et were screened against DPPH and superoxide free radicals, six
different cancer cell lines and one normal human cell line (NHME). This work is
the first report ...
#manglicolous lichen #antioxidant #cancer #Sulforhodamine B assay
Biodiversity and distribution patterns of free-living nematodes communities in Ba Lai river, Ben Tre province
Tập 56 Số 2 - Trang 224-235 - 2018
Nematodes communities in Ba Lai river, Ben Tre province were investigated in
September of 2015 (eight stations from estuary to upstream). The results showed
that the nematodes communities have characterized by high density and
biodiversity, providing useful information of nematodes assemblages in
freshwater habitas, in particular inland river. Also the results indicated that
the distribution of ne...
#Ba Lai dam #Ben Tre province #biodiversity #dam effect #distribution #nematodes communities
Application of botanical pesticides in organic agriculture production: Potential and challenges
Tập 59 Số 6 - Trang 679-701 - 2021
In the context of agricultural pest management, botanical pesticides are best
suited for use in organic food (agricultural) production, due to their safety to
humans and the environment compared to conventional pesticides. Compounds of
plant origin can be highly effective, with diverse and multiple mechanisms of
action, while having low toxicity towards non-target organisms. However, the
large-sca...
#botanical pesticides #plant disease #insects #weeds #phytopathogens
Chemical constituents from methanolic extract of Garcinia mackeaniana leaves and their antioxidant activity
Tập 58 Số 4 - Trang 411-418 - 2020
A phytochemical investigation of the methanolic extract of Garcinia
mackeaniana leaves led to the isolation, and determination of five secondary
metabolites, including one benzophenone
4,3',4'-trihydroxy-2,6-dimethoxybenzophenone (1), two flavone C-glucosides
vitexin (2) and its 2''-O-acetyl derivative (3), one biflavone amentoflavone
(4), and one mono-phenol methyl protocatechuate (5). The chemic...
#Garcinia mackeaniana #leaves #phytochemistry #antioxidant activity
Flavonoids isolated from the flowers of Camellia chrysantha
Tập 57 Số 3 - Trang 287-293 - 2019
Camellia chrysantha (the golden camellia, golden tea) is a species of evergreen
shrub or small tree belonging to the family Theaceae. The flowers and the leaves
of this plant are used as tea and drank for its health benefits. The aim of this
study was to investigate the chemical constituents of the flowers of Camellia
chrysantha. Five flavonoids were isolated from the flowers of Camellia
chrysanth...
#Camellia chrysantha #Theaceae #catechin #epicatechin #quercetin #quercetin-3-O-methyl ether #kaempferol.