Ivan Williams
Overview
Explore the profile of Ivan Williams including associated specialties, affiliations and a list of published articles.
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Articles
15
Citations
87
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0
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Recent Articles
1.
Matos-Moreno A, Alburez-Gutierrez D, Williams I, Verdery A, Fernandez Soto M, Santos-Lozada A
J Gerontol B Psychol Sci Soc Sci
. 2025 Mar;
PMID: 40065632
Objectives: Migration accelerates population aging in high-outmigration contexts. Older adults who remain in high-outmigration contexts are at higher risk of reduced support networks and increased caregiving burden, but prior work...
2.
Alburez-Gutierrez D, Williams I, Caswell H
Proc Natl Acad Sci U S A
. 2023 Dec;
120(52):e2315722120.
PMID: 38113253
Demographers have long attempted to project future changes in the size and composition of populations, but have ignored what these processes will mean for the size, composition, and age distribution...
3.
Santoro A, Lopez Osornio A, Williams I, Wachs M, Cejas C, Havela M, et al.
PLOS Glob Public Health
. 2023 Mar;
2(3):e0000186.
PMID: 36962316
The global impact of COVID-19 has challenged health systems across the world. This situation highlighted the need to develop policies based on scientific evidence to prepare the health systems and...
4.
Snyder M, Alburez-Gutierrez D, Williams I, Zagheni E
Proc Natl Acad Sci U S A
. 2022 Jun;
119(26):e2202686119.
PMID: 35737829
Excess mortality associated with the COVID-19 pandemic has led many to experience the loss of family members, with significant negative outcomes. We quantify the extent to which these population-wide rates...
5.
Shaw M, Lye J, Alves A, Hanlon M, Lehmann J, Supple J, et al.
Phys Med
. 2021 Mar;
84:265-273.
PMID: 33773909
Purpose: Current quality assurance of radiotherapy involving bony regions generally utilises homogeneous phantoms and dose calculations, ignoring the challenges of heterogeneities with dosimetry problems likely occurring around bone. Anthropomorphic phantoms...
6.
Lehmann J, Alves A, Dunn L, Shaw M, Kenny J, Keehan S, et al.
Phys Imaging Radiat Oncol
. 2021 Jan;
6:5-11.
PMID: 33458381
Background And Purpose: Independent dosimetry audits improve quality and safety of radiation therapy. This work reports on design and findings of a comprehensive 3D conformal radiotherapy (3D-CRT) Level III audit....
7.
Kry S, Peterson C, Howell R, Izewska J, Lye J, Clark C, et al.
Phys Imaging Radiat Oncol
. 2019 Dec;
7:39-44.
PMID: 31872085
Background And Purpose: Remote beam output audits, which independently measure an institution's machine calibration, are a common component of independent radiotherapy peer review. This work reviews the results and trends...
8.
Lye J, Kry S, Shaw M, Gibbons F, Keehan S, Lehmann J, et al.
Med Phys
. 2019 Sep;
46(12):5878-5887.
PMID: 31494941
Purpose: Consistency between different international quality assurance groups is important in the progress toward similar standards and expectations in radiotherapy dosimetry around the world, and in the context of consistent...
9.
Oliver C, Butler D, Takau V, Williams I
J Appl Clin Med Phys
. 2018 Jan;
19(2):329-337.
PMID: 29368796
The Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) held a comparison exercise in April 2016 where participants came to ARPANSA and measured the output factor of a nominal 5 ...
10.
Rosas A, Velazquez V, Olivares F, Camacho T, Williams I
ISA Trans
. 2017 May;
70:238-247.
PMID: 28554683
A methodology to assess the quality of estimation of disturbances in mechanical systems, by state observers, in the control structure with active compensation of disturbances (ADRC) is presented. Evaluation is...