Positron Trapping Processes in Temperature-Sensitive Thick- film Structures

Positron trapping processes in so-called “free” thick-film structures based on spinel-type Cu0.1Ni0.8Co0.2Mn1.9O4 ceramics are studied. The observed positron trapping can be fully defined within the two-state positron trapping model. The defect-related component in the fit of the experimentally measured positron lifetime spectra for thick films and bulk ceramics testifies to similarity of positron trapping processes in spinel-based materials. It is shown that in some cases the size of free-volume entities in thick films can rise due to redistribute space of their inner structure at addition glasses and other compounds. But positrons are trapped more strongly in bulk ceramics due to more ramified their grain/pores structure

Client Governing Success Criteria in Building Information Modelling (BIM)-Based Projects

Building Information Modeling (BIM), also known as n-D Modeling is a revolutionary development in the Architecture-Engineering-Construction (AEC) industry that consists of both technology and process. BIM helps project stakeholders in communicating complex, technical and difficult to visualise project elements that not easily explained. Nevertheless, there is a lack of overall governance within the current projects environment. A successful BIM implementation needs the involvement of behavioural, cultural and technological changes to transform the organisation into BIM-based projects through adopting new processes and standards. Thus, it is inevitable to develop a governance solution to facilitate BIM adoption in a collaborative working environment across project lifecycle. This paper discusses a success measure of BIM-based projects in Malaysia. The methodology is based on a qualitative research technique and the method is through a well-planned brainstorming workshop. All data were analysed using Atlas t.i. version 8. The findings revealed that four (4) success measures of BIM-based projects are: socio-organisational, legal, technical, and financial. It is anticipated that the findings reported in this paper could provide an insight for future strategies and guidelines for the development of BIM projects in Malaysia. BIM governance framework proves to be valuable for project stakeholders in managing collective efforts to standardise construction processes

Positronium Characterization of Nanopores in Technologically Modified MgO-Al2O3 Ceramics

It is established that positron annihilation lifetime spectroscopy can be successful used as porosimetry method to study of nanopores size and transformation of free volume in humidity-sensitive MgO-Al2O3 ceramics in adsorption-desorption cycles using lifetimes of ortho-positronium-related components. It is shown that the fourth component gives information about water-free volume or nanopores size, while the third component reflects positronium trapping both in nanopores and in water “bubbles”

Positronium Characterization of Nanopores in Technologically Modified MgO-Al2O3 Ceramics

It is established that positron annihilation lifetime spectroscopy can be successful used as porosimetry method to study of nanopores size and transformation of free volume in humidity-sensitive MgO-Al2O3 ceramics in adsorption-desorption cycles using lifetimes of ortho-positronium-related components. It is shown that the fourth component gives information about water-free volume or nanopores size, while the third component reflects positronium trapping both in nanopores and in water “bubbles”

Nanoporous characterization of modified humidity-sensitive MgO-Al2O3 ceramics by positron annihilation lifetime spectroscopy method

The work was supported by the Ukrainian Ministry of Education and Science. H. Klym thanks Prof. O. Shpotyuk for the fruitful discussion.Investigation of nanopores in the humidity-sensitive MgO-Al2O3 ceramics modified at 1100°C for 2 hours was performed using positron annihilation lifetime spectroscopy method. Lifetimes of the third and fourth components of positron annihilation lifetime spectra obtained by four-component fitting procedure were used for calculation of nanopores radii. Transformation in free volumes was studied in ceramics after drying and exposure to water vapor. It is established that the lifetime of the third component decreases and the intensity of this component increases in ceramics exposed to water vapor reflecting ortho-positronium decay in nanopores simultaneously with annihilation in water bubbles. The characteristics of the fourth component (lifetime and intensity) decrease in ceramics exposed to water vapor reflecting ortho-positronium trapping in free-water volume of nanopores. Final drying of the MgO-Al2O3 ceramics results in returning of ortho-positronium lifetimes and intensities to the initial values confirming good desorption of water from nanopores of ceramics.Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Influence of Sintering Temperature on Pore Structure and Electrical properties of Technologically Modified MgO-Al2O3 Ceramics

Technologically modified spinel ceramics are prepared from Al2O3 and 4MgCO3×Mg(OH)2×5H2O powders at 1200, 1300 and 1400 oC. The influence of sintering temperature on porous structure and exploitation properties of obtained humidity-sensitive MgO-Al2O3 ceramics are studied. It is shown that increasing of preparing temperature from 1200 to 1400 oC result in transformation of pore size distribution in ceramics from tri- to bi-modal including the open macro- and mesopores with sizes from tem to hundreds nm and nanopores until to a few nm. The studied ceramic elements with electrical resistances ~ 10-2-102 MОhm are high humidity sensitive in the region of 30-95 % with minimal hysteresis in adsorption-desorption cycles. It is established that increasing of humidity sensitivity in ceramics are related to achievement near to optimum pore size distribution and quantity of pores in the all regions. Prolonged degradation transformation in ceramics at higher temperature and relative humidity result in lose sensitivity up to 40-50 %.DOI: http://dx.doi.org/10.5755/j01.ms.21.1.5189</p

Association of Researchers in Construction Management

Information and technology has produced large changes to construction industry and leads to innovative nations globally. Building Information Modeling (BIM) is one of the IT platforms to rely on the process of planning, design, construction, and operation of a building in 3D dimension to promote collaborative and integration between the parties in the construction projects environment. BIM is defined as a parametric modeling to support project life cycle through relevant data and information shared among project stakeholders. BIM roadmap is a strategic plan by the government of Malaysia to ensure a wider adoption of BIM embraced among industry players. However, despite the existence of strategic implementation plan recently developed by the Government of Malaysia through CIDB, the implementation plan has less emphasis on strategic analysis elements (i.e., capacity, support, and value). Hence, the objective of this paper is to incorporate the strategic analysis elements (i.e., capacity, support, and value) in the existing Malaysia BIM roadmap pillars based on the lesson learnt from Australia, Singapore and Hong Kong. A qualitative research technique was employed in the form of document analysis for the establishment of Malaysia&apos;s BIM roadmap, while a formal workshop with experts from representatives of Public Work Department and Ministry of Health (directly involved in the first BIM Malaysia&apos;s pilot project of National Cancer Institute) for the establishment strategic analysis elements (i.e. capacity, support, and value) to be embedded in the roadmap. The findings suggest that the strategic analysis elements (i.e., capacity, support, and value) to be incorporated in the existing Malaysia&apos;s BIM roadmap has seven pillars (i.e., standards and accreditation, collaboration and incentives education and awareness, national BIM library, BIM guidelines, special interest group (SIG); research and development (R&amp;D). The outcomes could act as a guideline to industry players for future development of BIM-based projects in Malaysia