Bui Duc Tinh

University of Economics - University of Hue · Faculty of Economics and Development Studies

In this paper, we propose the design of a photonic crystal fiber with four central cores infiltrated by a high-index liquid to achieve highly efficient control of light guidance. We analyze the field distribution, effective mode area, and dispersion characteristics of the fundamental guided modes of the fiber. Within the coupled-mode theory, the pu...

Small-scale hydropower dams have made significant contribution to meet about 30% to 45% total electric quantity for each country Vietnam, Lao and Cambodia. However, rapid development of hydropower dams, particularly small-scale ones has been leading to water insecurity and causing adverse impacts on local livelihood. Getting a depth insights will h...

The time-dependent Ginzburg–Landau Lawrence–Doniach model with thermal fluctuations is used to investigate the critical current density. We calculate the critical current as a function of magnetic field and temperature in the homogeneous phase. The theoretical result based on the self-consistent Gaussian approximation is used to fit the measurement...

In this research, the numerical calculation for elastic and nonlinear strains of Fe metal and FeC alloy under different pressure has been performed by the statistical moment method SMM with Mie-Lennard-Jones potential (MLJ) and Embedded-Jones potential Atom Method (EAM). The analysis reveals that an enhancement in the concentration (cC) from 0 to 5...

A nonlinear theory of the electronic transport in superconductors under magnetic field in the framework of the three-dimensional Ginzburg–Landau model with thermal fluctuation is investigated. We assume that the thermal fluctuations are strong enough to melt the Abrikosov vortex lattice created by the magnetic field into a moving vortex liquid. On...

The melting temperature, the jumps of volume, enthalpy and entropy at the melting point, the isothermal compressibility, the thermal expansion coefficient, the heat capacity at constant volume, the Grüneisen parameter, the Debye temperature, the electrical resistivity, the thermal conductivity, and the thermal diffusivity for defective and perfect...

Nghiên cứu này nhằm đánh giá tính bền vững của sinh kế của hộ nông dân nuôi trồng thủy sản tại vùng đầm phá tỉnh Thừa Thiên Huế. Nghiên cứu đã đưa ra được 4 nhóm tiêu chí đo lường sinh kế bền vững gồm kinh tế, xã hội, môi trường và thể chế chính sách với 28 chỉ tiêu. Hệ số nhất quán (CR) ở nhóm nuôi chuyên canh; nhóm nuôi xen ghép và và nhóm cá lồn...

In this work, we build the model and derive the theory of nonlinear deformation for substitutional alloy AB with interstitial atom C and face-centered cubic structure under pressure from the statistical moment method. The calculation results for FCC-AuCuSi are presented. We obtain the values of density of deformation energy, maximum real stress, li...

The thermal fluctuations contribution to the transport energy of type-II layered superconductors is investigated in the framework of the Lawrence–Doniach model. It was discovered that temperature dependence of the magnetization and the magnetoconductivity of high-temperature cuprate superconductors exhibits an intersection point at a temperature sl...

The dynamics of the flux flow in the mixed state of high-Tc superconductor interacting with an artificial pinning array is considered. We calculate analytically the current density for the case of when the number of vortices outnumbers that of the pinning centers using the time-dependent Ginzburg-Landau equations in a magnetic field in the presence...

Economic approaches to combat environmental degradation and deforestation have resulted in development initiatives such as the Payment for Environmental Services program (PES). This study deals with the effects of PES on women's livelihoods in Thuong Lo commune, Central Vietnam. Employing a feminist political ecology perspective and adopting a qual...

In this work, we have presented a new approach investigating the influence of temperature and pressure on the electrical resistivity of metals. In the framework of the statistical moment method, high temperatures up to 1350 K and high pressure up to 100 GPa electrical resistivity of Au and Cu are calculated. The equation of state, the Gruneisen par...

The thermodynamic properties of metals are studied using the moment method in the statistical dynamics, which allows us to take into account the anharmonicity of thermal lattice vibrations, going beyond the quasi-harmonic approximation. Within the fourth-order moment approximation, the free energy, equation of state and thermal expansion of the met...

The thermodynamic properties of alloys are studied using the statistical moment method (SMM), which allows us to take into account the anharmonicity of the thermal lattice vibration. Within the forth-order moment approximation, the free energy, equation of state and lattice spacing of the binary ordered alloys with cubic structure are given explici...

This article aims to analyze the impact of regional economic integration on agricultural production risk in the case study of banana value chain in Huong Hoa district, Quang Tri province, one of the provinces located on East-West economic corridor. The article utilises methods of value chain analysis that is mainly based on descriptive statistical...

Strong fluctuation effects were found in both low- and high-field regimes by recent measurements of magnetization on La1.9Ca1.1Cu2O6+δ (LCCO) single crystals. The low-field fluctuation diamagnetic susceptibility data could not be fitted by simple Gaussian fluctuation theory using the lowest Landau level (LLL) approximation because of the slightly n...

The ionic conductivities of yttria-doped ceria (YDC) and yttria-stabilized zirconia (YSZ), are investigatied using statistical moment method including the anharmonicity effects of thermal lattice vibrations. The expressions for the lattice constant and the vacancy activation energy are derived in closed analytic forms in terms of the power moments...

The analytic expressions for the free energy, the concentration of equilibrium vacancies, the isothermal compressibility, the thermal expansion coefficient and the heat capacities at constant volume and at constant pressure of BCC substitutional alloy AB with interstitial atom C and with vacancy under pressure are derived by the statistical moment...

The statistical moment method is used to study the melting of defective interstitial AB alloys, where A is the main element and B is an interstitial atom, with a body-centered-cubic (BCC) structure. The melting temperature of the AB alloy with defects is obtained from the temperature of absolute stability for the crystalline state and the equilibri...

The analytic expressions for the thermodynamic and elastic quantities such as the mean nearest neighbor distance, the free energy, the isothermal compressibility, the thermal expansion coefficient, the heat capacities at constant volume and at constant pressure, the Young modulus, the bulk modulus, the rigidity modulus, and the elastic constants of...

This paper studies on the dependence of the mean nearest neighbor distance, the Young modulus E , the bulk modulus K , the rigidity modulus G and the elastic constants C11 , C12 , C44 on temperature, pressure, the concentration of substitution atoms and the concentration of interstitial atoms for alloy AuCuSi (substitution alloy AuCu with interstit...

A precisive calculation of specific heat contributions of vortex liquids and solids in type-II superconductor is presented. We use the self-consistent method in the presence of magnetic field for the Ginzburg-Landau description of thermal fluctuations effects in the vortex liquids. Self-consistent calculation of the specific heat summing over all L...

We use the statistical moment method to study the dependence of the critical temperature Tc for Cu 3 Au on pressure in the interval from 0 to 30 kbar. The calculated mean speed of changing critical temperature to pressure is 1.8 K/kbar. This result is in a good agreement with the experimental data.

The effect of a high electric field on the c-axis fluctuation conductivity in layered superconductors near the superconducting transition is investigated by the time-dependent Ginzburg-Landau equation. The c-axis fluctuation conductivity is calculated in self-consistent Gaussian approximation for an arbitrarily strong electric field and a magnetic...

The time-dependent Ginzburg-Landau model with thermal noise is used to calculate the out of plane a.c. fluctuation conductivity of type-II superconductor under magnetic field. We assume that thermal fluctuations, represented by the Langevin white noise, are strong enough to melt the Abrikosov vortex lattice created by the magnetic field into a movi...

We investigate effect of higher Ladau levels on the transverse thermoelectricconductivity \(\alpha_{xy}\), describing the Nernst effect in high-\(T_c\) superconductors, by using the time-dependent Ginzburg-Landau theory in two dimensional model withthermal noise. The transverse thermoelectric conductivity is calculated inthe self-consistent Gaussia...

We calculated the Nernst signal eN, describing the Nernst effect in type-II superconductor in the vortex-liquid regime, by using the time-dependent Ginzburg-Landau (TDGL) equation with thermal noise. The nonlinear interaction term in the TDGL equation is treated within self-consistent Gaussian approximation. The expression of the Nernst signal eN i...

In this paper, we have studied the transport properties in two-dimensional superconductors in the frame of the Langevin approach to the time dependent Ginzburg–Landau equation. The electrical and thermoelectric conductivity, resulting from thermal fluctuations of the superconducting order parameter, are computed in the self-consistent Gaussian appr...

In this paper, the dependence of the melting temperature of metals Cu, Ag and Au under pressure in the interval from 0 kbar to 40 kbar is studied by the statistical moment method (SMM). This dependence has the form of near linearity and the calculated slopes of melting curve are 3.9 for Cu, 5.7 for Ag and 6 for Au. These results are in good agreeme...

The fluctuation Hall conductivity and the Hall angle, describing the Hall effect, are calculated for arbitray value of the imaginary part of the relaxation time in the frame of the time-dependent Ginzburg-Landau theory in type II-superconductor with thermal noise describing strong thermal fluctuations. The self-consistent Gaussian approximation is...

We use the time-dependent Ginzburg-Landau (TDGL) equation with thermal noise to calculatethe transverse thermoelectric conductivity αxy describing theNernst effect and magnetization Mz in type-IIsuperconductor in the vortex-liquid regime. The nonlinear interaction term in dynamics istreated within self-consistent Gaussian approximation. The express...

The equation of state, the expressions of lattice parameter and thermal expansion coefficient in general form are obtained by the statistical moment method. Applying to Cu, Al and Ni metals, we determine these properties in simple analytic form for each metal. Numerical results for the thermal expansion coefficient of these metals in different temp...

The time-dependent Ginzburg-Landau approach is used to calculate the complex fluctuation conductivity in layered type-II superconductor under magnetic field. Layered structure of the superconductor is accounted for by means of the Lawrence-Doniach model, while the nonlinear interaction term in dynamics is treated within self-consistent Gaussian app...

We calculate fluctuation Hall conductivity of a strongly type-II superconductor in strong electric fields by using the time dependent Ginzburg–Landau approach. Thermal fluctuations, represented by the Langevin white noise, are assumed to be strong enough to melt the Abrikosov vortex lattice created by the magnetic field into a moving vortex liquid....

Forests are important in providing products and services supporting life and livelihood activitiesby providing diverse ecological or environmental services. However, losses of forest resources through deforestation and forest degradation, as a result of diverse factors such as illegal logging and fires, has been a major problem in Viet Nam in recen...

With over 10 million hectares of mangrove spread across the coastline of Vietnam, mangroves are considered an important resource for socio-economic development as well as playing a role in both the mitigation of, and adaptation to, climate change. Located in Binh Dinh province, Thi Nai is the largest lagoon with mangroves on the south central c...

With over 10 million hectares of mangrove spreading throughout the coastal line of Vietnam, which is considered as important source for socioeconomic development and crucial mitigation measure to climate change. The use of mangrove, however, shows that large area of mangrove was declined dramatically due to expansion of economic activities, such as...

In a choice experiment, households in Vietnam are offered flood insurance to mitigate increasing catastrophic flood risks due to climate change. Participants are asked to choose their most preferred insurance policy given expected future flood and mortality risks, insurance cover and associated insurance premiums. Although not affordable to everyon...

We use the time-dependent Ginzburg–Landau to calculate ac fluctuation conductivity and resistivity in type-II superconductor in 3D model under magnetic field. Thermal fluctuations are assumed to be strong enough to melt the Abrikosov vortex lattice created by the magnetic field into a vibrating vortex liquid and marginalize the effects of the vorte...

Chi trả dịch vụ môi trường rừng (DVMTR) là cách tiếp cận mới nhằm bảo tồn rừng đã được áp dụng rộng rãi ở các nước phát triển cũng như các nước đang phát triển. Ở Việt Nam, chính sách chi trả DVMTR được áp dụng thí điểm ở Lâm Đồng và Sơn La từ cuối năm 2008. Bài báo này nghiên cứu ảnh hưởng kinh tế, xã hội và môi trường của chương trình chi trả DVM...

We use the time-dependent Ginzburg-Landau to calculate AC fluctuation conductivity in type-II superconductor in 2D model under magnetic field. Thermal fluctuations are assumed to be strong enough to melt the Abrikosov vortex lattice created by the magnetic field into a vibrating vortex liquid and marginalize the effects of the vortex pinning by inh...

Thu gom, vận chuyển và xử lý (TG, VC&XL) chất thải rắn sinh hoạt (CTRSH) là vấn đề phức tạp, đòi hỏi thời gian, tiền bạc và công sức. Kinh tế tăng trưởng cùng việc mở rộng của quá trình đô thị hoá, kéo theo sự gia tăng nhanh dân số ở đô thị làm lượng CTRSH phát sinh tăng lên. Bên cạnh đó, yêu cầu của người dân về chất lượng dịch vụ này ngày càng ca...

Chi trả dịch vụ môi trường rừng (DVMTR) là cách tiếp cận mới nhằm bảo tồn rừng đã được áp dụng rộng rãi ở các nước phát triển cũng như các nước đang phát triển. Ở Việt Nam, chính sách chi trả DVMTR được áp dụng thí điểm ở Lâm Đồng và Sơn La từ cuối năm 2008. Bài báo này nghiên cứu ảnh hưởng kinh tế, xã hội và môi trường của chương trình chi trả DVM...

Natural disasters have severe impacts on the health and well-being of affected households. However, we find evidence that official damage cost assessments for floods and other natural disasters in Vietnam, where households have little or no insurance, clearly underestimate the total economic damage costs of these events as they do not include the w...

Trong những năm gần đây, nuôi trồng thuỷ sản xuất khẩu đã trở thành hướng đi hợp lý ở nhiều địa phương duyên hải ven biển nước ta. Miền Trung Việt Nam có bờ biển dài và nhiều đầm, phá, vịnh ăn thông với biển có tiềm năng lớn trong nuôi trồng thuỷ sản xuất khẩu, đặc biệt là nuôi tôm. Theo Tổng cục thống kê, năm 2010, diện tích nuôi trồng thuỷ sản kh...

A review of the existing literature on disasters, impact, local vulnerability, and adaptation indicates to the fact that recent increasing frequency of natural disasters (e.g., floods, storms, and drought) have increasingly caused impacts on a diverse set of physical and biological systems, especially for those living in the developing countries wh...

The increasing climate-induced disaster is one of the main obstacles for sustainable development. Many countries and their housing sectors are already highly vulnerable to weather and climate extremes, as illustrated by tropical cyclones in Myanmar, Viet Nam, and the Philippines, and flooding in India, Bangladesh, and China. Disaster impacts and lo...

Communities around the world are already vulnerable to disasters, the “Global Assessment Report: Disaster Risk Reduction” presents compelling new evidence of concentration of risk in many developing countries. The “Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report” reports that climate change is expected to be accompanied by...

This paper explores the impacts of floods on health, economy, environment, and society and tries to elucidate the rural community's coping mechanism to flood disasters in Quang Nam province in central Viet Nam. It focuses on the social aspects of flood risk perception that shapes the responses to floods. Findings revealed that severe floods cause h...

The time-dependent Ginzburg–Landau equation with thermal noise is used to calculate the Nernst signal e N , describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The Gaussian method used is an elaboration of the Hartree–Fock method. An additional assumption often made in analytical calculations that only the lowest La...

The time-dependent Ginzburg-Landau approach is used to investigate nonlinear response of a strongly type-II superconductor. The dissipation takes a form of the flux flow which is quantitatively studied beyond linear response. Thermal fluctuations, represented by the Langevin white noise, are assumed to be strong enough to melt the Abrikosov vortex...

This study identifies the adaptation behaviors of local institutions and households in order to determine a set of adaptation possibilities appropriate to Central Viet Nam. The constraints and barriers to implementing a set of adaptation possibilities have been analyzed from different angles, such as the economic status and education level of each...

We calculate, using the time-dependent Ginzburg-Landau (TDGL) equation with thermal noise, the transverse thermoelectric conductivity αxy, describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The method is an elaboration of the Hartree-Fock. An often made in analytical calculations additional assumption that only the...

We calculated, using the time-dependent Ginzburg-Landau equation with thermal noise, the transverse thermoelectric conductivity αxy and the Nernst signal eN, describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The Gaussian method used is an elaboration of the Hartree-Fock utilized by Ullah and Dorsey Phys. Rev. Lett...

Tourism is promoted by the governments of many developing countries because it offers the potential for creating jobs, thus generating income for the country and revenue for the government. However, the tourism industry can also be viewed as a destructive force, associated with negative externalities such as the loss of natural landscapes, congesti...