Alan Tkaczyk

Dr. Alan Tkaczyk

orcid

Research Focus & Metrics

Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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27 April 2018 in Journal of Physics D: Applied Physics
Verified
Journal Article
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ATAlan Tkaczyk
Alan Tkaczyk
ABAndreas Bartl
Andreas Bartl
Alessia AmatoAlessia Amato
Alessia Amato
Vjaceslavs LapkovskisVjaceslavs Lapkovskis
Vjaceslavs Lapkovskis
MPM Petranikova
M Petranikova

24 February 2018 in Minerals
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Journal Article
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JVJohannes Vind
Johannes Vind
AMAnnelies Malfliet
Annelies Malfliet
BBBart Blanpain
Bart Blanpain
Petros TsakiridisPetros Tsakiridis
Petros Tsakiridis
ATAlan Tkaczyk
Alan Tkaczyk
DPDimitrios Panias
Dimitrios Panias
The purpose of present work was to provide mineralogical insight into the rare earth element (REE) phases in bauxite residue to improve REE recovering technologies. Experimental work was performed by electron probe microanalysis with energy dispersive as well as wavelength dispersive spectroscopy and transmission electron microscopy. REEs are found as discrete mineral particles in bauxite residue. Their sizes range from <1 μm to about 40 μm. In bauxite residue, the most abundant REE bearing phases are light REE (LREE) ferrotitanates that form a solid solution between the phases with major compositions (REE,Ca,Na)(Ti,Fe)O3 and (Ca,Na)(Ti,Fe)O3. These are secondary phases formed during the Bayer process by an in-situ transformation of the precursor bauxite LREE phases. Compared to natural systems, the indicated solid solution resembles loparite-perovskite series. LREE particles often have a calcium ferrotitanate shell surrounding them that probably hinders their solubility. Minor amount of LREE carbonate and phosphate minerals as well as manganese-associated LREE phases are also present in bauxite residue. Heavy REEs occur in the same form as in bauxites, namely as yttrium phosphates. These results show that the Bayer process has an impact on the initial REE mineralogy contained in bauxite. Bauxite residue as well as selected bauxites are potentially good sources of REEs.

30 January 2018 in Preprints.org
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Preprint
Open access
JVJohannes Vind
Johannes Vind
AMAnnelies Malfliet
Annelies Malfliet
BBBart Blanpain
Bart Blanpain
Petros TsakiridisPetros Tsakiridis
Petros Tsakiridis
ATAlan Tkaczyk
Alan Tkaczyk
DPDimitrios Panias
Dimitrios Panias
The purpose of present work was to provide mineralogical insight in the rare earth element (REE) phases in bauxite residue to improve REE recovering technologies. Experimental work was performed by electron probe microanalysis with energy dispersive as well as wavelength dispersive spectroscopy and transmission electron microscopy. REEs are found as discrete mineral particles in bauxite residue. Their sizes range from < 1 μm to about 40 μm. In bauxite residue, the most abundant REE bearing phases are light REE (LREE) ferrotitanates, that form a solid solution between the phases with major compositions (REE,Ca,Na)(Ti,Fe)O3 and (Ca,Na)(Ti,Fe)O3. These are secondary phases formed during the Bayer process by an in-situ transformation of the precursor bauxite LREE phases. Comparing to natural systems, the indicated solid solution resembles loparite-perovskite series. LREE particles often have a calcium ferrotitanate shell surrounding them, that probably hinders their solubility. Minor amount of LREE carbonate and phosphate minerals as well as manganese-associated LREE phases are also present in bauxite residue. Heavy REEs occur in the same form as in bauxites, namely as yttrium phosphates. These results show that Bayer process has an impact on the initial REE mineralogy contained in bauxite. Bauxite residue as well as selected bauxites are potentially good sources of REEs.

24 October 2024 in Disability and Rehabilitation: Assistive Technology
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Journal Article
Open access
Carla SousaCarla Sousa
Carla Sousa
PTPaulina Tsvetkova
Paulina Tsvetkova
PPPatricia Pérez-Fuster
Patricia Pérez-Fuster
MAMay Agius
May Agius
SKSnezhana Kostova
Snezhana Kostova
ATAlan Tkaczyk
Alan Tkaczyk
Contemporary technologies, such as mainstream and specialised Assistive Technologies (ATs), are seen as effective. However, there is a noticeable gap between technological progress and the ability to customise these technologies to meet the unique needs and characteristics of neurodivergent individuals, particularly those on the Autism Spectrum and people with Intellectual Disability (pwID). The goal of this study is to investigate the present requirements and future priorities acknowledged by specialists in the field regarding the progress of social inclusion for this population, making use of ATs. A qualitative survey involving 24 international experts, and its respective thematic analysis reveals challenges in social inclusion, emphasizing communication and physical accessibility, awareness gaps, and stigma. Concurrently, issues surrounding ATs include limited access, insufficient training, and a lack of awareness and skills, with individuals, and families being inadequately involved. The study proposes strategies for overcoming these challenges, with a focus on accessibility, awareness, skills, family involvement, and customization. Identified research needs encompass scientific development, inclusive approaches, and changes in technological development paradigms.

18 December 2024 in Disabilities
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PTPaulina Tsvetkova
Paulina Tsvetkova
Carla SousaCarla Sousa
Carla Sousa
DBDaniel Beiderbeck
Daniel Beiderbeck
AKAneta Maria Kochanowicz
Aneta Maria Kochanowicz
BGBranislav Gerazov
Branislav Gerazov
ATAlan Tkaczyk
Alan Tkaczyk
Advancements in Assistive Technologies (ATs) have significantly improved the quality of life and autonomy for people with intellectual disabilities and autistic individuals, enhancing education, social interaction, employment, and mental health. Nevertheless, several barriers still emerge in the daily implementation of such technologies, highlighting the need to explore them in depth. Using a two-round Delphi method, we conducted a research study with an expert panel of 284 participants from 31 European countries, collecting quantitative and qualitative data. We tested ten future-oriented projections and gathered insights on participants’ backgrounds and attitudes towards ATs for this demographic. To enhance representation, experts from academia, service providers, industry, and disability organizations, as well as individuals with disabilities and their families, were included. Although the findings show strong consensus among experts on the positive impact and desirability of ATs for promoting the social inclusion of people with intellectual disabilities and autistic individuals, they also reveal differing perceptions across expert groups and identify two distinct future scenarios linked to different cultural, social, and economic hindrances. In this sense, our study provides diverse global perspectives, with the potential to help governing bodies understand the expectations, concerns, and needs related to ATs for often underrepresented groups–people with intellectual disabilities and autistic individuals in this case.

15 November 2021 in Journal of Radiological Protection
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Journal Article
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SMSara Della Monaca
Sara Della Monaca
VDValentina Dini
Valentina Dini
SGSveva Grande
Sveva Grande
APAlessandra Palma
Alessandra Palma
ATAlan Tkaczyk
Alan Tkaczyk
SBSimon Bouffler
Simon Bouffler
It is increasingly recognised that stakeholder views can be essential for ascertaining the credibility of those entrusted with protection of the public and workers against radiation risks, the robustness of the approaches to protection and the relevance of research underpinning radiation protection (RP). The CONCERT European Joint Programme of RP research included consideration of stakeholder views. These were evaluated by means of a publicly available survey, translated into 15 languages, to encourage responses from a wide range of European countries. The survey ran in 2017 and received some 1961 responses from many countries, although response rates varied widely between countries. The survey respondents were largely highly educated, with many having a professional connection to RP or the use of radiation in medicine or industry. Survey results indicated a high level of scientific/technical knowledge relevant to RP and indicated a general trust of most actors involved in the RP field, perhaps unsurprisingly given the nature of the sampled population. Most expressed a reasonable level of satisfaction with the information available to them on radiation risk, but there is clearly room for improvement. Additionally, the survey identified potential training needs amongst the groups who responded. It is concluded that, while the survey results are limited by the non-representativeness of the respondents by comparison with the population of the European Union as a whole, it has been successful in gaining insights into areas where communication could be improved, where professional training gaps are present and where research could help to build wider trust in RP.