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: Specifying Single-user and Collaborative Profiles for Alerting Systems

authors: Jung, Doris

subjects: Human Computer Interaction

abstract: The 21st century is the age of information overload. Often, humans are incapable of processing all of the information that surrounds them and determining its relevance. The impact of overlooking crucial information ranges from annoying to fatal.

Alerting systems help users deal with this vast amount of information by employing a push-based rather than a pull-based approach to information delivery. In this way, users receive the information they require at the appropriate moment. Users specify their alerting needs in a profile that is subscribed to the alerting system. The alerting system is continuously fed with data, and filters this data against all subscribed profiles. Whenever incoming data matches a profile, the subscriber is alerted.

Although alerting systems solve the problem of information overload, the potential of these systems has not been fully put into practice. Alerting systems are either realised as dedicated systems that, at best, offer a set of possible profiles to choose from or, at worst, offer a preset profile for one purpose only. Alternatively, they are application frameworks that offer no support for the average user; that is, the specification of profiles is realised using a programming interface. Collaboration between users when specifying profiles is not supported.

This thesis verifies the described situation by considering the example application domain of health care. Within this context, a requirements analysis was undertaken involving a patient-based online survey and interviews with health care providers. This analysis revealed the utility of alerting systems but a need for support for profile specification by end-users. It also identified the need for such a system to support the collaborative nature of health care.
 
The shortcomings of alerting systems identified for the health-care area also exist in other domains. Hence, a variety of application areas will benefit from providing universal solutions to eliminate these shortcomings.

Based on these findings, this thesis proposes the graphical profile specification language GPDL and an interactive single-user software tool that supports its use (GPDL-UI). The thesis introduces a novel collaborative alerting model for Information Systems. A collaborative extension of GPDL is implemented in the software tool CoastEd, an editor for the graphical specification of collaborative profiles. The developed languages and software tools target average users who have no expertise in specifying profiles involving logics and temporal constraints.

The efficacy of the proposed languages and software were evaluated through three user studies. The first study examined interpretation and specification with GPDL. Based on the results of this first study, the single-user system GPDL-UI was designed and implemented and then evaluated in a second study. In turn, the lessons learned from the implementation and user studies for the single-user system influenced the development of the collaborative approach CoastEd; this editor was evaluated in the third study.

The studies have shown that GPDL and GPDL-UI are suitable means for average users to effectively specify profiles in single-user alerting systems. High levels of accuracy were reached for specification and interpretation in both studies. GPDL-UI turned out to be a usable and effective software tool. The collaborative approach and CoastEd succeed in conveying the idea of collaborative profile specification to average users. Most types of collaborative profiles were successfully specified by users. For the initiator of the collaborative profile specification process, two types of profiles call for further research.

Overall, the approach, languages and software tools developed are shown to be effective and merit future research in that area.

text: Specifying Single-user and Collaborative Profiles for Alerting Systems The 21st century is the age of information overload. Often, humans are incapable of processing all of the information that surrounds them and determining its relevance. The impact of overlooking crucial information ranges from annoying to fatal.

Alerting systems help users deal with this vast amount of information by employing a push-based rather than a pull-based approach to information delivery. In this way, users receive the information they require at the appropriate moment. Users specify their alerting needs in a profile that is subscribed to the alerting system. The alerting system is continuously fed with data, and filters this data against all subscribed profiles. Whenever incoming data matches a profile, the subscriber is alerted.

Although alerting systems solve the problem of information overload, the potential of these systems has not been fully put into practice. Alerting systems are either realised as dedicated systems that, at best, offer a set of possible profiles to choose from or, at worst, offer a preset profile for one purpose only. Alternatively, they are application frameworks that offer no support for the average user; that is, the specification of profiles is realised using a programming interface. Collaboration between users when specifying profiles is not supported.

This thesis verifies the described situation by considering the example application domain of health care. Within this context, a requirements analysis was undertaken involving a patient-based online survey and interviews with health care providers. This analysis revealed the utility of alerting systems but a need for support for profile specification by end-users. It also identified the need for such a system to support the collaborative nature of health care.
 
The shortcomings of alerting systems identified for the health-care area also exist in other domains. Hence, a variety of application areas will benefit from providing universal solutions to eliminate these shortcomings.

Based on these findings, this thesis proposes the graphical profile specification language GPDL and an interactive single-user software tool that supports its use (GPDL-UI). The thesis introduces a novel collaborative alerting model for Information Systems. A collaborative extension of GPDL is implemented in the software tool CoastEd, an editor for the graphical specification of collaborative profiles. The developed languages and software tools target average users who have no expertise in specifying profiles involving logics and temporal constraints.

The efficacy of the proposed languages and software were evaluated through three user studies. The first study examined interpretation and specification with GPDL. Based on the results of this first study, the single-user system GPDL-UI was designed and implemented and then evaluated in a second study. In turn, the lessons learned from the implementation and user studies for the single-user system influenced the development of the collaborative approach CoastEd; this editor was evaluated in the third study.

The studies have shown that GPDL and GPDL-UI are suitable means for average users to effectively specify profiles in single-user alerting systems. High levels of accuracy were reached for specification and interpretation in both studies. GPDL-UI turned out to be a usable and effective software tool. The collaborative approach and CoastEd succeed in conveying the idea of collaborative profile specification to average users. Most types of collaborative profiles were successfully specified by users. For the initiator of the collaborative profile specification process, two types of profiles call for further research.

Overall, the approach, languages and software tools developed are shown to be effective and merit future research in that area.

year: 2009

title: A Portfolio of Compositions

authors: Dobson, Elizabeth Jane

subjects: music

abstract: The pieces in this portfolio cover a wide range of methods and styles - from work for a single vocalising percussionist, to singing bowl and electronics and a work for full orchestra. The aim of this portfolio is to demonstrate my technical and musical proficiency as well as to give an overview of my personal composing philosophy and style.
The portfolio opens with a work for orchestra, A Study in Scarlet. It differs from my previous orchestral works and is based on a musical code of Sir Arthur Conan Doyle's book, titled A Study in Scarlet. This was read in the 2009 Todd/ NSZO Young Composer Readings. The second work is .manatu.. It features tinkly piano, wind chimes and ethnic instrumentalists in a chamber ensemble to create a musical sound world. This was written for and premiered at Bang on a Can's summer music festival in Massachusetts 2009. The piano work .ātanga. is an adaptation of .manatu. for solo pianist and was written for the Dame Malvina Major Foundations Showcase Concert in New Plymouth. This adaptation proved to be a worthwhile exercise in efficient use of music material. Wrong Number is a Janet Frame poem set for soprano and real-time effect processing of audio. Confessions - Part I and II, for solo violin and string orchestra is based on the Fibonacci series and explores my love for string sonorities. Sand Song was written for a friend who asked me to set a poem she wrote. Here I demonstrate my love for setting text and voice to say something beautiful and precise. This song now stands as a eulogy for her Father. Parihaka, for vocalising percussionist, is a setting of Apirana Taylor's poem Parihaka and was written for Australian performer Louise Devenish. I explore further in the realm of live acoustic and electroacoustic music with Orison a piece I wrote for myself to perform live with singing bowl and Ableton Live. Finally The Headlines Today for five improvising musicians explores the music of shouting and the vernacular of place.

text: A Portfolio of Compositions The pieces in this portfolio cover a wide range of methods and styles - from work for a single vocalising percussionist, to singing bowl and electronics and a work for full orchestra. The aim of this portfolio is to demonstrate my technical and musical proficiency as well as to give an overview of my personal composing philosophy and style.
The portfolio opens with a work for orchestra, A Study in Scarlet. It differs from my previous orchestral works and is based on a musical code of Sir Arthur Conan Doyle's book, titled A Study in Scarlet. This was read in the 2009 Todd/ NSZO Young Composer Readings. The second work is .manatu.. It features tinkly piano, wind chimes and ethnic instrumentalists in a chamber ensemble to create a musical sound world. This was written for and premiered at Bang on a Can's summer music festival in Massachusetts 2009. The piano work .ātanga. is an adaptation of .manatu. for solo pianist and was written for the Dame Malvina Major Foundations Showcase Concert in New Plymouth. This adaptation proved to be a worthwhile exercise in efficient use of music material. Wrong Number is a Janet Frame poem set for soprano and real-time effect processing of audio. Confessions - Part I and II, for solo violin and string orchestra is based on the Fibonacci series and explores my love for string sonorities. Sand Song was written for a friend who asked me to set a poem she wrote. Here I demonstrate my love for setting text and voice to say something beautiful and precise. This song now stands as a eulogy for her Father. Parihaka, for vocalising percussionist, is a setting of Apirana Taylor's poem Parihaka and was written for Australian performer Louise Devenish. I explore further in the realm of live acoustic and electroacoustic music with Orison a piece I wrote for myself to perform live with singing bowl and Ableton Live. Finally The Headlines Today for five improvising musicians explores the music of shouting and the vernacular of place.

year: 2010