title: Quantifying the properties of low-cost powder metallurgy titanium alloys

authors: Bolzoni, Leandro

subjects: Titanium alloys

abstract: The extensive industrial employment of titanium is hindered by its high production costs where reduction of these costs can be achieved using cheap alloying elements and appropriate alternative processing techniques. In this work the feasibility of the production of low-cost titanium alloys is addressed by adding steel to pure titanium and processing the alloys by powder metallurgy. In particular, a spherical 4140 LCH steel powder commonly used in metal injection moulding is blended with irregular hydride-dehydride Ti. The new low-cost alloys are cold uniaxially pressed and sintered under high vacuum and show comparable properties to other wrought-equivalent and powder metallurgy titanium alloys. Differential thermal analysis and X-ray diffraction analyses confirm that Ti can tolerate the employment of iron as primary alloying element without forming detrimental TiFe-based intermetallic phases. Thus, the newly designed α+β alloys could be used for cheaper non-critical components.

text: Quantifying the properties of low-cost powder metallurgy titanium alloys The extensive industrial employment of titanium is hindered by its high production costs where reduction of these costs can be achieved using cheap alloying elements and appropriate alternative processing techniques. In this work the feasibility of the production of low-cost titanium alloys is addressed by adding steel to pure titanium and processing the alloys by powder metallurgy. In particular, a spherical 4140 LCH steel powder commonly used in metal injection moulding is blended with irregular hydride-dehydride Ti. The new low-cost alloys are cold uniaxially pressed and sintered under high vacuum and show comparable properties to other wrought-equivalent and powder metallurgy titanium alloys. Differential thermal analysis and X-ray diffraction analyses confirm that Ti can tolerate the employment of iron as primary alloying element without forming detrimental TiFe-based intermetallic phases. Thus, the newly designed α+β alloys could be used for cheaper non-critical components.

year: 2017-02

title: Video-based road commentary training improves hazard perception of young drivers in a dual task

authors: Isler, Robert B.

subjects: driving behaviour

abstract: This study used a video-based hazard perception dual task to compare the hazard perception skills of young drivers with middle aged, more experienced drivers and to determine if these skills can be improved with video-based road commentary training. The primary task required the participants to detect and verbally identify immediate hazard on video-based traffic scenarios while concurrently performing a secondary tracking task, simulating the steering of real driving. The results showed that the young drivers perceived fewer immediate hazards (mean = 75.2%, n = 24, 19 females) than the more experienced drivers (mean = 87.5%, n = 8, all females), and had longer hazard perception times, but performed better in the secondary tracking task. After the road commentary training, the mean percentage of hazards detected and identified by the young drivers improved to the level of the experienced drivers and was significantly higher than that of an age and driving experience matched control group. The results will be discussed in the context of psychological theories of hazard perception and in relation to road commentary as an evidence-based training intervention that seems to improve many aspects of unsafe driving behaviour in young drivers.

text: Video-based road commentary training improves hazard perception of young drivers in a dual task This study used a video-based hazard perception dual task to compare the hazard perception skills of young drivers with middle aged, more experienced drivers and to determine if these skills can be improved with video-based road commentary training. The primary task required the participants to detect and verbally identify immediate hazard on video-based traffic scenarios while concurrently performing a secondary tracking task, simulating the steering of real driving. The results showed that the young drivers perceived fewer immediate hazards (mean = 75.2%, n = 24, 19 females) than the more experienced drivers (mean = 87.5%, n = 8, all females), and had longer hazard perception times, but performed better in the secondary tracking task. After the road commentary training, the mean percentage of hazards detected and identified by the young drivers improved to the level of the experienced drivers and was significantly higher than that of an age and driving experience matched control group. The results will be discussed in the context of psychological theories of hazard perception and in relation to road commentary as an evidence-based training intervention that seems to improve many aspects of unsafe driving behaviour in young drivers.

year: 2009

title: Te Ika Huirua o Te Mate

authors: Maxwell, Te Kahautu

abstract: This composition is a lament to two staesman of the Māori world Apira Mahuika of Ngāti Porou and Tama Huata of Ngāti Kahungunu. Both men were giants in their respective areas, governance, tribal politics cultral revival language revitalisation, Treaty settlements they both died within days of each other. This compostion also talks about how Pākeha law clashes with Māori lore with the James Takamore case where his whanau took his body and returned it to James ancestral home Whakatohea and the widow laid charges to have her husbands remains dug up and returned to Christchuch. I thought it appropriate to protest about this being the Te Matatini World Championship Kapa Haka Competition was held in Christchurch March 2015. This composition was performed by Ōpōtiki Mai Tawhiti.

text: Te Ika Huirua o Te Mate This composition is a lament to two staesman of the Māori world Apira Mahuika of Ngāti Porou and Tama Huata of Ngāti Kahungunu. Both men were giants in their respective areas, governance, tribal politics cultral revival language revitalisation, Treaty settlements they both died within days of each other. This compostion also talks about how Pākeha law clashes with Māori lore with the James Takamore case where his whanau took his body and returned it to James ancestral home Whakatohea and the widow laid charges to have her husbands remains dug up and returned to Christchuch. I thought it appropriate to protest about this being the Te Matatini World Championship Kapa Haka Competition was held in Christchurch March 2015. This composition was performed by Ōpōtiki Mai Tawhiti.

year: 2015-02-12