The size effect in mechanical properties of boron nitride nanotube under tension - Nguyen Danh TruongMechanical properties of BN-NTs under uniaxial tension are investigated using atomic finite element method. Main findings are listed as follows: • The BN armchair tubes exhibit stronger than the BN zigzag ones under axial tension. • The BN-NTs exhibit brittle fracture. Location of fracture took place at the middle of BN (14, 0) zigzag tube wher...
9 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 677 | Lượt tải: 0
Water-Soluble components of ancistrocladus cochinchinensis - Le Quynh LienCompound 4 was isolated as white powder. There are three protons of a trisubstituted aromatic ring at 6.98 (1H, d, J = 8.5 Hz), 6.44 (1H, d, J = 2.5 Hz) and 6.60 (1H, dd, J = 3.0, 8.5 Hz); two singlet equivalence protons 7.32 (2H, s); three aromatic methoxy groups at 3.85 (6H, s, 2 x CH3) and 3.79 (3H, s); and an anomeric of a β-oriented sugar m...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 561 | Lượt tải: 0
Experimental cultivation of spirulina platensis using my an mineral water, Thua Thien Hue provinceMy An mineral water was suitable for the growth of Spirulina platensis after removing H2S. Productivity of Spirulina platensis cultivated in My An mineral water was about 10 g/m2.day. Spirulina platensis biomass had good quality with high amount of crude protein and fatty acids, reaching 68.32 % and 7.32 %, respectively. In addition, the amount ...
9 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 690 | Lượt tải: 0
The effects of silver nanoparticles on growth of chrysanthemum morifolium ramat. cv. "jimba" in different cultural systemsSilver nanoparticles are suitable for in vitro Chrysanthemum growth in various culture systems: in vitro solid medium, in vitro liquid medium and microponic system are 1.5; 1.5; 5 ppm, respectively. Different culture systems have different SNPs absorbability which directly proportional to the culture time and inversely proportional to the SNPs c...
12 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 528 | Lượt tải: 0
Influence of synthesis factors on properties of geopolymers based on red mud and rice husk ash - Tran Ngoc TuyenGeopolymers was successfully synthesized from RM and RHA under the most appropriate conditions that were: (i) initial material compositions were RM, RHA and NaOH with SiO2/Al2O3 molar ratio of 4 and Na2O/Al2O3 molar ratio of 2.0; (ii) curing temperature of 100oC; (iii) curing time of 24 hours. The physico-mechanical properties including compress...
14 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 583 | Lượt tải: 0
Effect of some effective parameters on cod removal from Nam Son landfill leachate by electrocoagulationThe study indicated several properties of Nam Son landfill leachate, COD, NH4+ and pH in particular with the concentration in the range of approximately 6247 ± 295, 1270 ± 38 mg/l and 8 respectively. With the increase in current (1 to 4 A), the COD removal efficiencies increased from approximately 50 to 78 % (pH = 8 and operating time = 40 min)....
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 764 | Lượt tải: 0
An investigation of the structural characteristics of modified cellulose from acacia pulp - Doan Minh KhaiThe modified acacia celluloses from acacia pulp in Vietnam have some different characteristics from the Canadian softwood cellulose, the Indonesian hardwood cellulose and the initial acacia pulp. As the initial acacia pulp, CND and INDO, the AH-7.5 sample is a cellulose I, and the AH-15 sample is a cellulose II. The cellulose I of modified acaci...
9 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 811 | Lượt tải: 0
A method of real-Time nurbs interpolation with confined chord error for cnc systemsIn this paper, a real-time interpolation method is presented for parametric NURBS curves. The interpolation algorithm is based on the second order Taylor’s expansion. This method canA method of real-time NURBS interpolation with confined chord error for CNC systems 657 maintain a small feedrate fluctuation, but the chord error can be large at po...
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 697 | Lượt tải: 0
A systematic approach to the dilemma between flood vulnerability and resilience - Review and concepts - Hoang Cong TriThe proposed framework integrates major points of the flipping coin (vulnerability and resilience are normalized as stress and resources, and they are two sides of the same coin) and separation concepts (vulnerability and resilience both can generate positive and/or negative outcomes) to address the dynamic interactions between ecological vulner...
17 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 773 | Lượt tải: 0
Structural and optical properties in near infrared of cdtese coloidal quantum dots for potential application in solar cellsBy the method of fabricating quantum dots at 260 oC in 10 minutes, alloyed CdTeSe QDs have been formed with good crystallization and zinc-blende single phase. Raman spectra results were completely in sync with XRD, therefore Raman spectra could be used as an effective tool to estimate the Se and Te compositions available in CdTeSe QDs. Studies o...
11 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 634 | Lượt tải: 0
