Testing Joints between Walls Made of AAC Masonry Units

Joints between walls are very important for structural analysis of each masonry building at the global and local level. This issue has often been neglected in the case of traditional joints and relatively squat walls. At present, the issue of wall joints is becoming particularly important due to the continuous drive for simplifying structures, introducing new technologies and materials. Eurocode 6 and other standards (American, Canadian, Chinese, and Japanese) recommend inspecting joints between walls, but no detailed procedures have been specified. This paper presents our own tests on joints between walls made of autoclaved aerated concrete (AAC) masonry units. Tests included reference models composed of two wall panels joined perpendicularly with a standard masonry bond (six models), with classic steel and modified connectors (twelve models). The shape and size of test models and the structure of a test stand were determined on the basis of the analysis of the current knowledge, pilot studies and numerical FEM (Finite Element Method) - based analyses. The analyses referred to the morphology and failure mechanism of models. Load-displacement relationships for different types of joints were compared and obtained results were related to results for reference models. The mechanisms of cracking and failure was found to vary, and clear differences in the behaviour and load capacity of each type of joint were observed. The individual working phases of joints were determined and defined, and an empirical approach was proposed for the determination of forces and displacement of wall joints.

Testing Joints between Walls Made of AAC Masonry Units

Joints between walls are very important for structural analysis of each masonry building at the global and local level. This issue was often neglected in case of traditional joints and relatively squat walls. Nowadays the issue of wall joints is becoming particularly important due to the continuous strive for simplifying structures, introducing new technologies and materials. Eurocode 6 and other standards (USA, Canadian, Chinese, and Japanese) recommend inspecting joints between walls, but no detail procedures have been specified. This paper presents our own tests on joints between walls made of autoclaved aerated concrete (AAC) masonry units. Tests included reference models composed of two wall panels joined perpendicularly with a masonry bond (6 models), traditional steel and modified connectors (12 models). A shape and size of test models and structure of a test stand were determined on the basis of the analysis of the current knowledge, pilot studies and numerical analyses of FEM. The analysis referred to the morphology and failure mechanism of models. Load-displacement relationships for different types of joints were compared and obtained results were referred to results for reference models. A mechanism of cracking and failure was found to vary, and clear differences in behaviour and load capacity of each type of joints were observed. Individual working phases of joints were determined and defined, and the empirical approach was suggested to determine forces and displacement of wall joints.

Pastor Wellness among Chinese Churches: A Canadian Study

This article reports the results of a survey of Canadian Chinese pastors (N = 79) regarding pastor wellness by using a 10-item questionnaire. The results indicate that 22 (27.84%) have significant concerns and 38 (48.1%) have some concerns, with females slightly more affected. Major areas of concern are marital and/or family satisfaction, physical health, problem dealing with relationships in church, and emotional health. The author discusses the implications of the results and makes some recommendations to the pastors and churches.

Comparative Metabolomic Analysis of Rapeseeds from Three Countries

Rapeseed is an important oilseed with proper fatty acid composition and abundant bioactive components. Canada and China are the two major rapeseed-producing countries all over the world. Meanwhile, Canada and Mongolia are major importers of rapeseed due to the great demand for rapeseed in China. To investigate the metabolites in rapeseeds from three countries, ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS)-based metabolomics was employed to analyze rapeseeds from China, Canada, and Mongolia. As results, 67, 53, and 68 metabolites showed significant differences between Chinese and Canadian, Chinese and Mongolian, and Canadian and Mongolian rapeseeds, respectively. Differential metabolites were mainly distributed in the metabolic pathways including phenylpropanoid biosynthesis, flavone and flavonol biosynthesis, and ubiquinone and other terpenoid-quinone biosynthesis. Among the differential metabolites, contents of sinapate and sinapine were higher in Chinese rapeseeds, while the contents of brassicasterol, stigmasterol, and campestanol were higher in Canadian rapeseeds. These findings might provide insight into the metabolic characteristics of rapeseeds from three countries to guide processing and consumption of the products of rapeseed.

Researching resilience: lessons learned from working with rural, Sesotho-speaking South African young people

Theories of youth resilience neglect youths’ lived experiences of what facilitates positive adjustment to hardship. The Pathways-to-Resilience Study addressed this by inviting Canadian, Chinese, Colombian, New Zealand and South African (SA) youths to share their resilience-related knowledge. In this article I report the challenges endemic to the rural, resource-poor, South African research site that complicated this Pathways ideal. I illustrate that blind application of a multi-country study design, albeit well-designed, potentially excludes youths with inaccessible parents, high mobility, and/or cellular telephone contact details. Additionally, I show that one-on-one interview methods do not serve Sesotho-speaking youths well, and that the inclusion of adult ‘insiders’ in a research team does not guarantee regard for local youths’ insights. I comment critically on how these challenges were addressed and use this to propose seven lessons that are likely to inform, and support, youth-advantaging qualitative research in similar majority-world contexts.