This paper presents a numerical investigation using the two-parameter fracture mechanics approach for studying threaded fastener geometries. It was found that the constraint arising from the presence of a surface crack in a threaded fastener does influence the stress in the forward sector. Consequently, the actual stress field shows a deviation from the theoretical HRR solution. Implementation ...

As a public organisation, road administrations have the responsibility to improve the road construction process. However, the changes in such process involve a number of the stakeholders, who have different perceptions about what is most important in the road construction process. Perspectives on the necessity and nature of change will differ too. In order to provide an environment in which the...

Parents’ socialization goals are important for cultural transmission across generations, but whether such goals vary by ethnic and socioeconomic backgrounds and change over children’s first years of life remains unexamined. In Study 1, African-American, Dominican immigrant, and Mexican immigrant mothers (N = 300) reported on the qualities deemed as desirable or undesirable when children were ag...

The attributes of individual software engineers are perhaps the most important factors in determining the success of software development. Our goal is to identify the professional competencies that are most essential. In particular, we seek to identify the attributes that di erentiate between exceptional and non-exceptional software engineers. Phase 1 of our research is a qualitative study desi...

This paper presents a critical survey of the reference current generation (RCG) methods for harmonic and reactive power compensation for the electrical distribution systems. A critical review of the pq method, the d-q(id-iq) method, the p-q-r method, the UPF method and the FBD method are presented for the sake of comparison. In order to mitigate the deficiencies of these existing methods, the m...

Following a brief discussion of the meanings of constructivism an argument is made to the effect that Q methodology is a constructivist methodology in a sense that is compatible with the philosophy of Alfred North Whitehead. A brief comparison of the ideas of Stephenson and Whitehead is followed by a section outlining Whitehead’s notion of the ‘event’ or ‘actual occasion’ as the core of a radic...

Many attitude estimation methods are based on an optimization problem posed in 1965 by Grace Wahba. All these methods will yield the same optimal estimate, except for inevitable computer roundoff errors. This note shows that Shuster’s Quaternion Estimator (QUEST) and Mortari’s Estimator of the Optimal Quaternion (ESOQ) are essentially identical even in the presence of computer roundoff errors. ...

Background and Purpose: Climate change has an impact on economic and natural systems as well as human health. These impacts are particularly visible in urbanised areas. Urban forests, which are one of the main natural features of the cities, are threatened by climate change. Generally, the role of forests in combating climate change is widely recognised and its significance is recognised also i...