Monte-Carlo simulation of the durability of glass fibre reinforced composite under environmental stress corrosion

The lifetime distribution of glass fibre subject to permanent environmental stress corrosion is very important for assessing the durability and damage tolerance of composites using glass reinforcement. A mechanical model based on the statistics of flaw spectra during stress corrosion and 3D shear lag model is presented. The proposed approach shows that it is possible to identify the influence of stress corrosion properties on the long term durability of glass fibre reinforced composites (GFRP)

Human resources for commune health centers as per national standards : the case of Vietnam

Vietnam is among a few countries which have established a model of Commune Health Centers (CHCs) to serve primary health care for all people. Using quota sampling technique, 30 CHCs per each among nine provinces nationwide were equally selected for data collection to assess human resources for CHCs as national standards in Vietnam. A total of 239 CHCs finally completed the survey. Overall, the average number of Health Care Workers (HCWs) in each CHC was 6.3 ± 1.7, which met the national standards (at least five HCWs per CHC). However, only 24.4% of CHCs had 5 required job positions, and 59.7% of CHCs had at least one doctor. These shortages were more emerging in mountainous and remote areas. Further, mountainous and remote areas have been underrepresented of female HCWs, as compared to those in rural and urban areas. Our data provide a quite strong case for policy makers and health managers to improve human resources structure for CHCs. Keywords: Human resources for health (HRH); Commune health center (CHC); Community health services; Healthcare workers; National standards; Vietnam. **Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliate “Huy Nguyen” is provided in this record*

A smoothed four-node piezoelectric element for analysis of two-dimensional smart structures

This paper reports a study of linear elastic analysis of two-dimensional piezoelectric structures using a smoothed four-node piezoelectric element. The element is built by incorporating the strain smoothing method of mesh-free conforming nodal integration into the standard four-node quadrilateral piezoelectric finite element. The approximations of mechanical strains and electric potential fields are normalized using a constant smoothing function. This allows the field gradients to be directly computed from shape functions. No mapping or coordinate transformation is necessary so that the element can be used in arbitrary shapes. Through several examples, the simplicity, efficiency and reliability of the element are demonstrated. Numerical results and comparative studies with other existing solutions in the literature suggest that the present element is robust, computationally inexpensive and easy to implement

An improved quadrilateral flat element with drilling degrees of freedom for shell structural analysis

This paper reports the development of a simple and efficient 4-node flat shell element with six degrees of freedom per node for the analysis of arbitrary shell structures. The element is developed by incorporating a strain smoothing technique into a flat shell finite element approach. The membrane part is formulated by applying the smoothing operation on a quadrilateral membrane element using Allman-type interpolation functions with drilling DOFs. The plate-bending component is established by a combination of the smoothed curvature and the substitute shear strain fields. As a result, the bending and a part of membrane stiffness matrices are computed on the boundaries of smoothing cells which leads to very accurate solutions, even with distorted meshes, and possible reduction in computational cost. The performance of the proposed element is validated and demonstrated through several numerical benchmark problems. Convergence studies and comparison with other existing solutions in the literature suggest that the present element is efficient, accurate and free of lockings

ON SITE WASTEWATER TREATMENT MODEL USED IN URBAN RESIDENTIAL AND TOURISM AREAS

Joint Research on Environmental Science and Technology for the Eart

WATER ENVIRONMENT AND WATER POLLUTION CONTROL IN VIETNAM : OVERVIEW OF STATUS AND MEASURES FOR FUTURE

Joint Research on Environmental Science and Technology for the Eart

New Blind Muti-signature Schemes based on ECDLP

In various types of electronic transactions, including election systems and digital cash schemes, user anonymity and authentication are always required. Blind signatures are considered the most important solutions to meeting these requirements. Many studies have focused on blind signature schemes; however, most of the studied schemes are single blind signature schemes. Although blind multi-signature schemes are available, few studies have focused on these schemes. In this article, blind multi-signature schemes are proposed based on the Elliptic Curve Discrete Logarithm Problem (ECDLP). The proposed schemes are based on the GOST R34.10-2012 digital signature standard and the EC-Schnorr digital signature scheme, and they satisfy blind multi-signature security requirements and have better computational performance than previously proposed schemes. The proposed schemes can be applied in election systems and digital cash schemes