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Search Results: 1 - 10 of 33876 matches for " Van Thang Duong "
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Microalgae Isolation and Selection for Prospective Biodiesel?Production
Van Thang Duong,Yan Li,Ekaterina Nowak,Peer M. Schenk
Energies , 2012, DOI: 10.3390/en5061835
Abstract: Biodiesel production from microalgae is being widely developed at different scales as a potential source of renewable energy with both economic and environmental benefits. Although many microalgae species have been identified and isolated for lipid production, there is currently no consensus as to which species provide the highest productivity. Different species are expected to function best at different aquatic, geographical and climatic conditions. In addition, other value-added products are now being considered for commercial production which necessitates the selection of the most capable algae strains suitable for multiple-product algae biorefineries. Here we present and review practical issues of several simple and robust methods for microalgae isolation and selection for traits that maybe most relevant for commercial biodiesel production. A combination of conventional and modern techniques is likely to be the most efficient route from isolation to large-scale cultivation.
Assessment of Radiation Dose Caused by Radioactive Gaseous Effluent Released from Nuclear Power Plant Ninh Thuan 1 under Scenario of Normal Working Conditions  [PDF]
Nguyen Tuan Khai, Do Xuan Anh, Le Dinh Cuong, Duong Duc Thang, Vuong Thu Bac, Nguyen Thi Thu Ha, Nguyen Quang Long, Trinh Van Giap, Nguyen Hao Quang
World Journal of Nuclear Science and Technology (WJNST) , 2015, DOI: 10.4236/wjnst.2015.53018
Abstract: Based on guides RG 1.109, RG 1.111 published by United States Nuclear Regulatory Commission (USNRC), our research concentrates in assessing radiation doses caused by radioactive substances released from the nuclear power plant (NPP) Ninh Thuan 1 under the scenario of normal operation using software package NRCDose72 provided by the USNRC. The database including the released radioactive nuclides, meteorology, terrain, population and agricultural production activities have been collected and processed to build the input data for the model calculation. The wind rose distribution obtained from the meteorological data in a five-year period from 2009-2013 showed that the radioactive nuclides released to environment spread in two main wind directions which are North East and South West. The X/Q (s/m3) and D/Q (s/m2) qualities which are, respectively, the ratio of activity concentration to release rate and that of deposition density of radioactive nuclides to release rate were calculated within an area of 80 km radius from the NPP site using XOQDOQ. Population doses were calculated using GASPAR. The XOQDOQ and GASPAR are two specific softwares in NRCDose72 package.
A computational formulation for constrained solid and liquid membranes considering isogeometric finite elements
Roger A. Sauer,Thang X. Duong,Callum J. Corbett
Physics , 2012,
Abstract: A geometrically exact membrane formulation is presented that is based on curvilinear coordinates and isogeometric finite elements, and is suitable for both solid and liquid membranes. The curvilinear coordinate system is used to describe both the theory and the finite element equations of the membrane. In the latter case this avoids the use of local cartesian coordinates at the element level. Consequently, no transformation of derivatives is required. The formulation considers a split of the in-plane and out-of-plane membrane contributions, which allows the construction of a stable formulation for liquid membranes with constant surface tension. The proposed membrane formulation is general, and accounts for dead and live loading, as well as enclosed volume, area, and contact constraints. The new formulation is illustrated by several challenging examples, considering linear and quadratic Lagrange elements, as well as isogeometric elements based on quadratic NURBS and cubic T-splines. It is seen that the isogeometric elements are much more accurate than standard Lagrange elements. The gain is especially large for the liquid membrane formulation since it depends explicitly on the surface curvature.
Existence of weak solutions for mixed problems of parabolic systems
Pham Trieu Duong,Do Van Loi
Electronic Journal of Differential Equations , 2010,
Abstract: The purpose of this paper is to investigate the existence of generalized solutions for strongly parabolic systems in a cylindrical domain. The decay of the solution at infinity, depending on the right-hand of the equation, is also studied in this article.
On Two Results of Mixed Multiplicities
Le Van Dinh,Duong Quoc Viet
Mathematics , 2009,
Abstract: This paper shows that the main result of Trung-Verma in 2007 [TV] only is an immediate consequence of an improvement version of [Theorem 3.4, Vi1] in 2000.
Lattices generated by Chip Firing Game models: criteria and recognition algorithm
Trung Van Pham,Thi Ha Duong Phan
Computer Science , 2012,
Abstract: It is well-known that the class of lattices generated by Chip Firing games (CFGs) is strictly included in the class of upper locally distributive lattices (ULD). However a necessary and sufficient criterion for this class is still an open question. In this paper we settle this problem by giving such a criterion. This criterion provides a polynomial-time algorithm for constructing a CFG which generates a given lattice if such a CFG exists. Going further we solve the same problem on two other classes of lattices which are generated by CFGs on the classes of undirected graphs and directed acyclic graphs.
Three New Anamorph of Ceramothyrium from Fallen Leaves in Vietnam  [PDF]
Le Thi Hoang Yen, Yasuhisa Tsurumi, Duong Van Hop, Katsuhiko Ando
Advances in Microbiology (AiM) , 2018, DOI: 10.4236/aim.2018.84021
Abstract: Three new anamorph of Ceramothyrium aquaticum sp. nov., Ceramothyrium exiguum sp. nov., and Ceramothyrium phuquocense sp. nov. are described and illustrated. These fungi were isolated from submerged decaying leaves collected from Phu Quoc National Park, Phu Quoc province, Viet Nam. The phylogeny based on ITS region and D1/D2 of the 28S rDNA gene showed that these fungi nested in the Ceramothyrium. Morphologically, C. aquaticum, C. phuquocense sp. nov. and C. exiguum sp. nov. are characterized; they were different from known anamorph species of Ceramothyrium by having one main axis and two lateral arms with 70 - 90, 33.5 - 72.5 and 70 - 130 μm long main axis, respectively. The table to compare Ceramothyrium anamorph is also given.
A Chaotic Pulse-Time Modulation Method for Digital Communication
Nguyen Xuan Quyen,Vu Van Yem,Thang Manh Hoang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/835304
Abstract: We present and investigate a method of chaotic pulse-time modulation (PTM) named chaotic pulse-width-position modulation (CPWPM) which is the combination of pulse-position-modulation (PPM) and pulse-width modulation (PWM) with the inclusion of chaos technique for digital communications. CPWPM signal is in the pulse train format, in which binary information is modulated onto chaotically-varied intervals of position and width of pulses, and therefore two bits are encoded on a single pulse. The operation of the method is described and the theoretical evaluation of bit-error rate (BER) performance in the presence of additive white Gaussian noise (AWGN) is provided. In addition, the chaotic behavior with tent map and its effect on average parameters of the system are investigated.Theoretical estimation and numerical simulation of a CPWPM system with specific parameters are carried out in order to verify the performance of the proposed method.
N-Methyl-N-styrylcinnamamide (lansamide) from Clausena lansium in Vietnam
Peter Luger,Manuela Weber,Tran Dinh Thang,Hoang Van Luu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809009611
Abstract: The title compound, C18H17NO, was isolated from the seeds of Clausena lansium (wampee) (Rutaceae). The X-ray crystal structure analysis confirmed its chemical identity and revealed that it is solvent-free, in contrast to the previously reported monohydrate [Huang, Ou & Tang (2006). Acta Cryst. E62, o1987–o1988]. The molecular structures are practically identical but the molecules pack differently. In contrast to the monohydrate in which the water molecule generates two hydrogen bonds, no such intermolecular contacts are present in the title compound. The dihedral angle between the cinnamamide and the styryl group is 53.1 (1)°.
A Chaos-Based Secure Direct-Sequence/Spread-Spectrum Communication System
Nguyen Xuan Quyen,Vu Van Yem,Thang Manh Hoang
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/764341
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