Nonlinear post-buckling of thin FGM annular spherical shells under mechanical loads and resting on elastic foundations

This paper presents an analytical approach to investigate the nonlinear buckling and post-buckling of thin annular spherical shells made of functionally graded materials (FGM) and subjected to mechanical load and resting on Winkler-Pasternak type elastic foundations. Material properties are graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of constituents. Equilibrium and compatibility equations for annular spherical shells are derived by using the classical thin shell theory in terms of the shell deflection and the stress function. Approximate analytical solutions are assumed to satisfy simply supported boundary conditions and Galerkin method is applied to obtain closed-form of load-deflection paths. An analysis is carried out to show the effects of material and geometrical properties and combination of loads on the stability of the annular spherical shells

Nonlinear analysis for proposing limit state criteria of reinforced concrete road bridge superstructures

In the research of long-time operating road bridge superstructures, it should note that when the internal forces in the beam elements reach specific values, the stiffness of the cross-section of these elements should decrease. Besides that, if there are damaged places in the beam-element of the road bridge superstructures, the element could not work normally, and the redistribution of internal forces between elements in the whole system would happen. This phenomenon was not taken into account in the initial design calculation. In practice, it shows that many road bridges are subjected to greater loads than the calculated loads in the design process, but they still normally operate. This article proposes the other limit state criteria in evaluating the load capacity reserve of road-bridge superstructures using nonlinear analysis based on nonlinear deformational models of modern construction codes. The proposed calculation procedure is established to explain the load capacity reserve of long-time operating road bridge superstructures in the case of the lack of experimental evaluation. From the obtained results, the suitable limit state criteria for road bridge superstructures are suggested, and the conclusions about the accuracy of the proposed approach of nonlinear structural analysis are recommended

Investigating determinants of quality of life: The case of older people in Ho Chi Minh City

This study was conducted to investigate the factors affecting the quality of life in terms of the health of the elderly in Ho Chi Minh City (HCMC), Vietnam. Health production theory was used to form the analytical framework for the study. The data set of 300 surveyed elderly people, which was randomly drawn from the list of 841,000 older people in HCMC by Excel random function, was used for quantitative analysis, including Exploratory Factor Analysis (EFA) and linear regression. Research results show that gender and marital status are not statistically significant while education, employment, bonding, bridging, and linking social capital statistically significant impact on the quality of life of the elderly. Specifically, the level of education improves the quality of life while employment reduces the quality of life. This finding is an important implication for policies related to the retirement age of employees. The research results have also provided empirical evidence on the potential of social capital, a resource existing in the network of relationships, in improving the quality of life besides other traditional resources. This finding is an important basis for policymakers in mobilizing social capital resources in the context of resource scarcity

Geometrically nonlinear buckling analysis of truss with length imperfection subjected to mechanical and thermal load using hybrid FEM

This paper presents a novel hybrid FEM-based approach to establish the mathematical model for solving the nonlinear buckling problem of truss systems with length imperfection under mechanical and thermal load. due to constant temperature change-based hybrid FEM. The proposed approach deals with establishing hybrid types of truss elements, including perfect truss elements without thermal deformation and truss elements with length imperfection and thermal deformation. The equilibrium equation of both truss elements is established based on compatibility relationships considering geometric nonlinearity. The hybrid global equilibrium equations of truss systems are developed by assembling constructed perfect truss elements without thermal deformation and truss elements with length imperfection and thermal deformation. The incremental-iterative algorithm based on the arc-length method is used to establish calculation programs to solve the hybrid global equilibrium equation for investigating the geometrically nonlinear buckling behavior of the truss system. The numerical test is presented to investigate the buckling and post-buckling behavior of truss systems having some elements with length imperfection under thermal and mechanical load

The Commitment with FDI Firms of Accountants in Noi Bai Industrial Park - Creative Application in Economics Sociological Knowledge

This study was conducted to identify, evaluate and measure the attributes of accountants’ commitment with FDI firms in Noi Bai industrial park, Hanoi based on the organizational commitment theory of Meyer & Allen (1991) and Creative application in economics sociological knowledge.  Beside, we based on literature review and the results of some interviews, 150 questionnaires were sent directly to accountants in FDI firms in Noi Bai industrial park and were collected in 1 month. However, only 110 questionnaires were satisfactory and included in the analysis. The results of descriptive statistics, Cronbach’s Alpha analysis and Independent T-test have identified and measured 12 attributes of accountants’ commitment which effect on accountants in the FDI firms in Noi Bai industrial park. Based on the findings, some recommendations are given to improve the accountants’ commitment. Keywords: commitment, accountants, FDI firms, Noi Bai industrial park JED codes: M41, M40, O15 DOI: 10.7176/RJFA/10-22-15 Publication date: November 30th 201

Impact of various essential oils and plant extracts on the characterization of the composite seaweed hydrocolloid and gac pulp (Momordica cochinchinensis) edible film

Edible films and coatings have currently received increasing interest because of their potential in food applications. This study examined the effect of incorporated essential oils and natural plant extracts on the characteristics of the composite seaweed hydrocolloid and gac pulp films. Films were prepared by a casting technique, followed by measurement of physical, optical, barrier, mechanical, and structural properties. The results showed that adding plant oils and extracts significantly affected the physical, optical, mechanical, and structural properties of the composite films. Incorporation of the essential oils resulted in a reduction in moisture content and opacity while increasing values for Hue angle and elongation at break of the composite films. Besides, incorporation of the plant extracts showed increases in thickness, opacity, Delta E, Chroma, and elongation at the break, while there is a decrease in the Hue angle values of the composite films. In conclusion, incorporating plant essential oils and extracts into composite seaweed hydrocolloid and gac pulp films can enhance film properties, which can potentially be applied in food products

Calculation of Temperature-Dependent Thermal Expansion Coefficient of Metal Crystals Based on Anharmonic Correlated Debye Model

This study aims to calculate the anharmonic thermal expansion (TE) coefficient of metal crystals in the temperature dependence. The calculation model is derived from the anharmonic correlated Debye (ACD) model that is developed using the many-body perturbation approach and correlated Debye model based on the anharmonic effective potential. This potential has taken into account the influence on the absorbing and backscattering atoms of all their nearest neighbors in the crystal lattice. The numerical results for the crystalline zinc (Zn) and crystalline copper (Cu) are in agreement with those obtained by the other theoretical model and experiments at several temperatures. The analytical results show that the ACD model is useful and efficient in analyzing the TE of coefficient of metal crystals

Measuring Supply Chain Smart Village Headman Performance

The supply chain management as the general tool can be used for supporting and delivering the goods to the villages. The village head is the leader of the village government. The tenure of the village head is 6 years, and can be extended for another one term is expected to run the government with a good performance in providing services to the community. So with the proper use of the supply chain the needs of the villages can be provide by the government. The Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method can help decision making in determining the performance index of the village head. This research is conduct by looking for the performance of positive and negative ideal solutions. Applications with the highest V value will occupy the top size in this system. Then the criteria in determining the performance index of the head of the village are: timeliness, discipline, responsibility, leadership, presence, value. The results of the decision-making system resulted in 6 alternative suggested performance indexes of village heads, with the highest score of Sending Agung Village

Measuring Supply Chain Performance through Migrant Workers Placement

To facilitate existing procedures and improve decision making, a decision support system (SPK) needs to be built. This SPK aimed  to determine the placement of workers abroad using the Simple Additive Weighting (SAW) method and supply chain process. This method was chosen because it is  able to select the best alternative from a number of alternatives, in this case the alternative in question was  someone who was entitled to receive Placement based on predetermined criteria. This research was conducted by looking for weight values for each individual. The Decision Support System produced was  capable of ranking prospective Indonesian migrant workers and  making it easier for BP3TKI to make decisions about Indonesian migrant workers by supply chain resource management for who will depart abroad