Vietnam Journal of Science and Technology

ACI

  2815-5874

 

 

 

Cơ quản chủ quản:  N/A

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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
Do Van Thom, Doan Hong Duc, Phung Van Minh, Nguyen Son Tung
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...... hiện toàn bộ
#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
Pham Dinh Dung, Le Si Ngoc, Nguyen Ngoc Duy, Nguyen Ngoc Thuy, Lu T. Minh Truc, Bui Van Le, Dang Van Phu, Nguyen Quoc Hien
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...... hiện toàn bộ
#Nanosilica #rice husk #growth #chili plant
Preparation and characterization of high-dispersed Pt/C nano-electrocatalysts for fuel cell applications.
Tập 54 Số 4 - Trang 472-482 - 2016
Hoang Anh Huy, Tran Van Man, Huynh Thien Tai, Van Thi Thanh Ho
Synthesis conditions are keys to controlling size and dispersion of Platinum (Pt) nanoparticle structures that is one of the most important goals in improving the electrochemical activity and durability of electrocatalyst as Pt nanoparticles catalyst for fuel cells. In this study, we introduce a simple method to address the effects of the temperature, pH and ethylene glycol enhancers (EG) on the m...... hiện toàn bộ
#Pt/C #Pt nanoparticles #Pt electrochemical active surface area #Pt /C catalyst #PtNPs/C.
Effect of the carbonization and activation processes on the adsorption capacity of rice husk activated carbon
Tập 55 Số 4 - Trang 494-402 - 2017
Hoa Thai Ma, Van Thi Thanh Ho, Nguyen Bao Pham, Dat Chi Nguyen, Kieu Thi Diem Vo, Hung Cam Ly, Tuan Dinh Phan
In this study, rice husk was used as a precursor to prepare activated carbon using steam as a physical activation agent. Steam for activation can be used to activate almost all raw materials. A variety of methods have been developed but all of these share the same basic principle of initial carbonization followed by an activation step with steam. The study also investigates the effects of preparat...... hiện toàn bộ
#rice husk #carbonization #activation #activated carbon
Membrane distillation for seawater desalination applications in Vietnam: potential and challenges
Tập 55 Số 6 - Trang 659-682 - 2017
Duong Cong Hung, Phan Duc Nhan, Nguyen Van Tinh, Pham Manh Thao, Nguyen Cong Nguyen
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...... hiện toàn bộ
#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
Duong Thanh Huan, Tran Minh Tu, Tran Huu Quoc
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 ...... hiện toàn bộ
#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
Pham Ngoc Khanh, Ho Viet Đuc, Tran Thu Huong, Vu Thi Ha, Doan Thi Van, Ninh The Son, Young Ho Kim, Do Quoc Viet, Nguyen Manh Cuong
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...... hiện toàn bộ
#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
Polimati Haritha, Sunil Kumar Patnaik, Vinay Bharadwaj Tatipamula
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 ...... hiện toàn bộ
#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
Tran Thanh Thai, Nguyen Le Que Lam, Nguyen Thi My Yen, Ann Vanreusel, Ngo Xuan Quang
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...... hiện toàn bộ
#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
Dao Huy Toan, Dao Van Hoang, Vu Dinh Hoang, Le Dang Quang, Tran Dai Lam
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...... hiện toàn bộ
#botanical pesticides #plant disease #insects #weeds #phytopathogens