title: Nickel(II) complexes of di- and tri-substituted thiourea mono- and di-anions

authors: Yuen, Ho Ying

subjects: nickel complexes

abstract: Reaction of nickel(II) acetate, 1,2-bis(diphenylphosphino)ethane (dppe), and a di- or tri-substituted thiourea R¹NHC(S)R²R³ (R³ = H or alkyl) with trimethylamine in hot methanol gave cationic nickel(II) complexes containing N,S-chelated thiourea monoanion ligands [Ni{SC(NR²R³)NR¹}(dppe)]⁺ , which can be readily isolated as their BPh₄⁻ salts. The X-ray crystal structure of [Ni{SC(NMe₂)NPh}(dppe)]⁺BPh₄⁻ is reported.

text: Nickel(II) complexes of di- and tri-substituted thiourea mono- and di-anions Reaction of nickel(II) acetate, 1,2-bis(diphenylphosphino)ethane (dppe), and a di- or tri-substituted thiourea R¹NHC(S)R²R³ (R³ = H or alkyl) with trimethylamine in hot methanol gave cationic nickel(II) complexes containing N,S-chelated thiourea monoanion ligands [Ni{SC(NR²R³)NR¹}(dppe)]⁺ , which can be readily isolated as their BPh₄⁻ salts. The X-ray crystal structure of [Ni{SC(NMe₂)NPh}(dppe)]⁺BPh₄⁻ is reported.

year: 2010

title: Experimental investigation of timber-to-steel connection using self-drilling wing screws

authors: Mohanswamy, Gowrava

abstract: Self-drilling wing screws are well-suited for hardwood and pressed material boards and are explored as an alternative connector to traditional bolts for connecting thick hot-rolled steel with timber. The wing avoids force-feeding of the screw into the timber which prevents the timber from cracking. However, limited studies were found on the timber-to-steel connection using self-drilling wing screws under shear loading. This paper investigates the shear behaviour and capacity of self-drilling winged screw connections between radiata pine timber and hot rolled steel plate through the experimental test. In addition, tensile coupon tests, screw bending tests, moisture content tests, screw pullout tests, and screw bearing tests were performed to determine the material properties of the steel, timber, and screws. A total of 70 experimental tests were conducted on the timber to steel connection connections with different steel thicknesses (8mm-20mm), timber thickness (15mm-45mm), numbers of screws (1-3), and screw axis angle (45°-90°). The failure mode is theoretically analyzed using Johansen yield theory. The resulting data from Eurocode 5 [24] was compared with experimental results as current AS/NZ standards lack adequate guidance in addressing timber-to-steel connections. From the above comparison, it was found that the Eurocode 5 [24] was under-conservative by 90%. Based on the experimental results, new design equations for calculating the shear capacity of self-drilling winged screws are proposed.

text: Experimental investigation of timber-to-steel connection using self-drilling wing screws Self-drilling wing screws are well-suited for hardwood and pressed material boards and are explored as an alternative connector to traditional bolts for connecting thick hot-rolled steel with timber. The wing avoids force-feeding of the screw into the timber which prevents the timber from cracking. However, limited studies were found on the timber-to-steel connection using self-drilling wing screws under shear loading. This paper investigates the shear behaviour and capacity of self-drilling winged screw connections between radiata pine timber and hot rolled steel plate through the experimental test. In addition, tensile coupon tests, screw bending tests, moisture content tests, screw pullout tests, and screw bearing tests were performed to determine the material properties of the steel, timber, and screws. A total of 70 experimental tests were conducted on the timber to steel connection connections with different steel thicknesses (8mm-20mm), timber thickness (15mm-45mm), numbers of screws (1-3), and screw axis angle (45°-90°). The failure mode is theoretically analyzed using Johansen yield theory. The resulting data from Eurocode 5 [24] was compared with experimental results as current AS/NZ standards lack adequate guidance in addressing timber-to-steel connections. From the above comparison, it was found that the Eurocode 5 [24] was under-conservative by 90%. Based on the experimental results, new design equations for calculating the shear capacity of self-drilling winged screws are proposed.

year: 2024

title: Te Mata Ira—Faces of the Gene: Developing a cultural foundation for biobanking and genomic research involving Māori

authors: Hudson, Maui

abstract: Te Mata Ira was a three-year research project (2012–2015) that explored Māori views on genomic research and biobanking for the development of culturally appropriate guidelines. A key component of this process has been to identify Māori concepts that provide cultural reference points for engaging with biobanking and genomic research. These cultural cues provide the basis for describing the cultural logic that underpins engagement in this context in a culturally acceptable manner. This paper outlines the role of two wānanga (workshops) conducted as part of the larger project that were used to make sense of the Māori concepts that emerged from other data-collection activities. The wānanga involved six experts who worked with the research team to make sense of the Māori concepts. The wānanga process created the logic behind the cultural foundation for biobanking and genomic research, providing a basis for understanding Māori concepts, Māori ethical principles and their application to biobanking and genomic research.

text: Te Mata Ira—Faces of the Gene: Developing a cultural foundation for biobanking and genomic research involving Māori Te Mata Ira was a three-year research project (2012–2015) that explored Māori views on genomic research and biobanking for the development of culturally appropriate guidelines. A key component of this process has been to identify Māori concepts that provide cultural reference points for engaging with biobanking and genomic research. These cultural cues provide the basis for describing the cultural logic that underpins engagement in this context in a culturally acceptable manner. This paper outlines the role of two wānanga (workshops) conducted as part of the larger project that were used to make sense of the Māori concepts that emerged from other data-collection activities. The wānanga involved six experts who worked with the research team to make sense of the Māori concepts. The wānanga process created the logic behind the cultural foundation for biobanking and genomic research, providing a basis for understanding Māori concepts, Māori ethical principles and their application to biobanking and genomic research.

year: 2016