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Book ; Online: Quasiperiodic bobbin lace patterns

Irvine, Veronika / Biedl, Therese / Kaplan, Craig S.

2019

Abstract: Bobbin lace is a fibre art form in which threads are braided together to form a fabric, often with a very detailed and complex design. In traditional practice, each region of the fabric is filled with a periodic texture. We establish the groundwork for ... ...

Abstract	Bobbin lace is a fibre art form in which threads are braided together to form a fabric, often with a very detailed and complex design. In traditional practice, each region of the fabric is filled with a periodic texture. We establish the groundwork for non-periodic lace patterns and present three new quasiperiodic families based on Sturmian words, the Penrose tiling by thick and thin rhombs and the Ammann-bar decoration of the Penrose tiling. Comment: 27 pages, 13 figures
Keywords	Computer Science - Discrete Mathematics ; Mathematics - Combinatorics ; Mathematics - Dynamical Systems ; Mathematics - Metric Geometry
Publishing date	2019-10-16
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Vertically constrained Motzkin-like paths inspired by bobbin lace

Irvine, Veronika / Melczer, Stephen / Ruskey, Frank

2018

Abstract: Inspired by a new mathematical model for bobbin lace, this paper considers finite lattice paths formed from the set of step vectors $\mathfrak{A}=$$\{\rightarrow,$ $\nearrow,$ $\searrow,$ $\uparrow,$ $\downarrow\}$ with the restriction that vertical ... ...

Abstract	Inspired by a new mathematical model for bobbin lace, this paper considers finite lattice paths formed from the set of step vectors $\mathfrak{A}=$$\{\rightarrow,$ $\nearrow,$ $\searrow,$ $\uparrow,$ $\downarrow\}$ with the restriction that vertical steps $(\uparrow, \downarrow)$ cannot be consecutive. The set $\mathfrak{A}$ is the union of the well known Motzkin step vectors $\mathfrak{M}=$$\{\rightarrow,$ $\nearrow,$ $\searrow\}$ with the vertical steps $\{\uparrow, \downarrow\}$. An explicit bijection $\phi$ between the exhaustive set of vertically constrained paths formed from $\mathfrak{A}$ and a bisection of the paths generated by $\mathfrak{M}$ is presented. In a similar manner, paths with the step vectors $\mathfrak{B}=$$\{\nearrow,$ $\searrow,$ $\uparrow,$ $\downarrow\}$, the union of Dyck step vectors and constrained vertical steps, are examined. We show, using the same $\phi$ mapping, that there is a bijection between vertically constrained $\mathfrak{B}$ paths and the subset of Motzkin paths avoiding horizontal steps at even indices. Generating functions are derived to enumerate these vertically constrained, partially directed paths when restricted to the half and quarter-plane. Finally, we extend Schr\"{o}der and Delannoy step sets in a similar manner and find a bijection between these paths and a subset of Schr\"{o}der paths that are smooth (do not change direction) at a regular horizontal interval.
Keywords	Mathematics - Combinatorics
Subject code	629
Publishing date	2018-04-23
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: King's Wife

Irvine, Valerie

George IV and Mrs Fitzherbert

2007

Abstract: One of the most extraordinary episodes in British royal history took place on 15 December 1785 when George, Prince of Wales (later Prince Regent and George IV) secretly married the beautiful, twice-widowed and Roman Catholic Maria Fitzherbert. This ... ...

Abstract	One of the most extraordinary episodes in British royal history took place on 15 December 1785 when George, Prince of Wales (later Prince Regent and George IV) secretly married the beautiful, twice-widowed and Roman Catholic Maria Fitzherbert. This marriage was in breach of the Royal Marriages Act of 1772 but was almost certainly valid in the eyes of the Catholic Church, and possibly of all Christian churches. If it had been discovered, George might well have forfeited his claim to the throne. As it was, George and Maria remained together for over twenty-five years, staying deeply attached, de
Language	English
Size	Online-Ressource (270 p.)
Publisher	Continuum International Publishing
Publishing place	London
Document type	Book ; Online
Note	Description based upon print version of record
ISBN	9781847250537 ; 184725053X
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Factors Influencing the Early Introduction of Sugar Sweetened Beverages among Infants: Findings from the HSHK Birth Cohort Study.

Irvine, Vanessa / John, James Rufus / Scott, Jane A / Hayen, Andrew / Do, Loc Giang / Bhole, Sameer / Ha, Diep / Kolt, Gregory S / Arora, Amit

Nutrients

2020 Volume 12, Issue 11

Abstract: Understanding the determinants of early introduction of sugar sweetened beverages (SSBs) may assist in designing effective public health interventions to prevent childhood weight related conditions (obesity). This study explores the relationship between ... ...

Abstract	Understanding the determinants of early introduction of sugar sweetened beverages (SSBs) may assist in designing effective public health interventions to prevent childhood weight related conditions (obesity). This study explores the relationship between family/infant characteristics and the early introduction of SSBs among infants in Sydney, Australia. Mothers (
MeSH term(s)	Adult ; Cohort Studies ; Female ; Humans ; Infant ; Logistic Models ; Male ; Multivariate Analysis ; Odds Ratio ; Parturition ; Sugar-Sweetened Beverages
Language	English
Publishing date	2020-10-30
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2518386-2
ISSN	2072-6643 ; 2072-6643
ISSN (online)	2072-6643
ISSN	2072-6643
DOI	10.3390/nu12113343
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Book ; Online: Reconstructing a Polyhedron between Polygons in Parallel Slices

Biedl, Therese / Bulatovic, Pavle / Irvine, Veronika / Lubiw, Anna / Merkel, Owen / Naredla, Anurag Murty

2020

Abstract: Given two $n$-vertex polygons, $P=(p_1, \ldots, p_n)$ lying in the $xy$-plane at $z=0$, and $P'=(p'_1, \ldots, p'_n)$ lying in the $xy$-plane at $z=1$, a banded surface is a triangulated surface homeomorphic to an annulus connecting $P$ and $P'$ such ... ...

Abstract	Given two $n$-vertex polygons, $P=(p_1, \ldots, p_n)$ lying in the $xy$-plane at $z=0$, and $P'=(p'_1, \ldots, p'_n)$ lying in the $xy$-plane at $z=1$, a banded surface is a triangulated surface homeomorphic to an annulus connecting $P$ and $P'$ such that the triangulation's edge set contains vertex disjoint paths $\pi_i$ connecting $p_i$ to $p'_i$ for all $i =1, \ldots, n$. The surface then consists of bands, where the $i$th band goes between $\pi_i$ and $\pi_{i+1}$. We give a polynomial-time algorithm to find a banded surface without Steiner points if one exists. We explore connections between banded surfaces and linear morphs, where time in the morph corresponds to the $z$ direction. In particular, we show that if $P$ and $P'$ are convex and the linear morph from $P$ to $P'$ (which moves the $i$th vertex on a straight line from $p_i$ to $p'_i$) remains planar at all times, then there is a banded surface without Steiner points. Comment: preliminary version appeared in the Canadian Conference on Computational Geometry (CCCG) 2019
Keywords	Computer Science - Computational Geometry ; 05C10 ; 52C99 ; 68W99 ; F.2.2 ; G.2.2
Subject code	516 ; 511
Publishing date	2020-04-13
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Factors Influencing the Early Introduction of Sugar Sweetened Beverages among Infants: Findings from the HSHK Birth Cohort Study

Irvine, Vanessa / John, James Rufus / Scott, Jane A / Hayen, Andrew / Do, Loc Giang / Bhole, Sameer / Ha, Diep / Kolt, Gregory S / Arora, Amit

Nutrients. 2020 Oct. 30, v. 12, no. 11

2020

Abstract	Understanding the determinants of early introduction of sugar sweetened beverages (SSBs) may assist in designing effective public health interventions to prevent childhood weight related conditions (obesity). This study explores the relationship between family/infant characteristics and the early introduction of SSBs among infants in Sydney, Australia. Mothers (n = 934) from an ongoing birth cohort study were interviewed at 8, 17, 34, and 52 weeks postpartum. Multivariable logistic regression analysis was used to identify family/infant factors independently associated with the likelihood of early introduction of SSBs (<52 weeks of age). Of the 934 mothers interviewed, 42.7% (n = 399) of infants were introduced to SSBs before 52 weeks. Mothers who were born in Vietnam (adjusted Odds Ratio (AOR) = 2.14; 95% confidence interval (CI) 1.33, 3.47), other Asian countries (AOR = 1.62; 95% CI 1.02, 2.58) as well as single mothers (AOR = 3.72; 95% CI 2.46, 5.62) had higher odds of introducing SSBs early to their infants. Mothers from highly advantaged socioeconomic background (AOR = 0.43; 95% CI 0.28, 0.68), those who breastfed their baby for 17–25 weeks (AOR = 0.60; 95% CI 0.37, 0.99), 26–51 weeks (AOR = 0.65; 95% CI 0.45, 0.94), and 52 weeks or more (AOR = 0.62; 95% CI 0.43, 0.90); and those who introduced solids between 17–25 weeks (AOR = 0.58; 95% CI 0.36, 0.91) and 26 weeks or more (AOR = 0.55; 95% CI 0.34, 0.91) had reduced odds of introducing SSBs early. Tailoring health promotion programs for these vulnerable groups may delay the introduction of SSBs.
Keywords	age ; breast feeding ; childhood ; cohort studies ; confidence interval ; health promotion ; infants ; mothers ; nutrients ; obesity ; odds ratio ; regression analysis ; solids ; sugar sweetened beverages ; weight ; Australia ; Vietnam
Language	English
Dates of publication	2020-1030
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
Note	NAL-light
ZDB-ID	2518386-2
ISSN	2072-6643
ISSN	2072-6643
DOI	10.3390/nu12113343
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: E-communication among mothers of infants and toddlers in a community-based cohort: a content analysis.

Hall, Wendy / Irvine, Valerie

Journal of advanced nursing

2009 Volume 65, Issue 1, Page(s) 175–183

Abstract: Aim: This paper is a report of a study to explain how mothers used a community based, cohort-based electronic communication system.: Background: Early psychosocial support for families is regarded as inadequate. Employed women with young children can ...

Abstract	Aim: This paper is a report of a study to explain how mothers used a community based, cohort-based electronic communication system. Background: Early psychosocial support for families is regarded as inadequate. Employed women with young children can feel isolated from other families. Most parent e-mail lists are in a read-only format, with parents receiving informative e-mails from a corporation or a commercially motivated initiative. In an increasingly virtual age, it is important to examine parents' use of online support groups initiated by parents. Method: We used a qualitative descriptive design to conduct an inductive content analysis of archived threads of e-mail from 40 middle class Canadian mothers involved in a grass-roots online support cohort that shared birth year and geographical community. Two hundred and ninety-two pages of single-spaced mother-based communication that occurred from June 2004 to May 2005 were analysed. Findings: Mothers used cohort-based electronic communication to build a local community, request and provide emotional support, share information and facilitate learning, and provide validation for the 'normalcy' of other women's mothering experiences. They shared stories and feelings, expressed sympathy, offered accolades, expressed appreciation for shared experiences, conveyed gratitude for support, and shared beliefs and expectations. Mothers anticipated childrearing difficulties shared strategies, exchanged advice, confirmed others' strategies and shared information. Conclusion: Women in particular geographical areas can use asynchronous mail systems to share information with and obtain support from other mothers. Cohort-based electronic communication could be particularly important in rural areas where travel is restricted for women and access to professional support is limited.
MeSH term(s)	Attitude to Computers ; Canada ; Child Health Services ; Child, Preschool ; Cohort Studies ; Communication ; Data Collection ; Electronic Mail/utilization ; Family/psychology ; Fathers ; Female ; Health Promotion/methods ; Humans ; Infant ; Male ; Mother-Child Relations ; Mothers/psychology ; Parenting/psychology ; Self-Help Groups/utilization ; Social Support
Language	English
Publishing date	2009-01
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	197634-5
ISSN	1365-2648 ; 0309-2402
ISSN (online)	1365-2648
ISSN	0309-2402
DOI	10.1111/j.1365-2648.2008.04856.x
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Book ; Online: Maximum Matchings and Minimum Blocking Sets in $\Theta_6$-Graphs

Biedl, Therese / Biniaz, Ahmad / Irvine, Veronika / Jain, Kshitij / Kindermann, Philipp / Lubiw, Anna

2019

Abstract: Theta_6$-Graphs graphs are important geometric graphs that have many applications especially in wireless sensor networks. They are equivalent to Delaunay graphs where empty equilateral triangles take the place of empty circles. We investigate lower ... ...

Abstract	$\Theta_6$-Graphs graphs are important geometric graphs that have many applications especially in wireless sensor networks. They are equivalent to Delaunay graphs where empty equilateral triangles take the place of empty circles. We investigate lower bounds on the size of maximum matchings in these graphs. The best known lower bound is $n/3$, where $n$ is the number of vertices of the graph. Babu et al. (2014) conjectured that any $\Theta_6$-graph has a (near-)perfect matching (as is true for standard Delaunay graphs). Although this conjecture remains open, we improve the lower bound to $(3n-8)/7$. We also relate the size of maximum matchings in $\Theta_6$-graphs to the minimum size of a blocking set. Every edge of a $\Theta_6$-graph on point set $P$ corresponds to an empty triangle that contains the endpoints of the edge but no other point of $P$. A blocking set has at least one point in each such triangle. We prove that the size of a maximum matching is at least $\beta(n)/2$ where $\beta(n)$ is the minimum, over all theta-six graphs with $n$ vertices, of the minimum size of a blocking set. In the other direction, lower bounds on matchings can be used to prove bounds on $\beta$, allowing us to show that $\beta(n)\geq 3n/4-2$.
Keywords	Computer Science - Computational Geometry
Subject code	511
Publishing date	2019-01-05
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Toxicity assessment of a former manufactured gas plant.

Ferguson, A S / Doherty, R / Larkin, M J / Kalin, R M / Irvine, V / Ofterdinger, U S

Bulletin of environmental contamination and toxicology

2003 Volume 71, Issue 1, Page(s) 21–30

MeSH term(s)	Biological Assay ; Carbon/analysis ; Carbon/toxicity ; Cyanides/analysis ; Cyanides/toxicity ; Fossil Fuels/toxicity ; Industry ; Soil Microbiology ; Soil Pollutants/toxicity ; Vibrio/drug effects ; Water Microbiology ; Water Pollutants, Chemical/toxicity
Chemical Substances	Cyanides ; Fossil Fuels ; Soil Pollutants ; Water Pollutants, Chemical ; Carbon (7440-44-0)
Language	English
Publishing date	2003-07
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	6895-0
ISSN	1432-0800 ; 0007-4861
ISSN (online)	1432-0800
ISSN	0007-4861
DOI	10.1007/s00128-003-0125-y
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Stochastic models for geriatric in-patient behaviour.

Irvine, V / McClean, S / Millard, P

IMA journal of mathematics applied in medicine and biology

1994 Volume 11, Issue 3, Page(s) 207–216

Abstract: Departments of geriatric medicine engage in two distinct forms of clinical activity: acute/rehabilitative and long-stay care. These are organizationally distinct and have very different resource needs. Current hospital planning models, however, assume ... ...

Abstract	Departments of geriatric medicine engage in two distinct forms of clinical activity: acute/rehabilitative and long-stay care. These are organizationally distinct and have very different resource needs. Current hospital planning models, however, assume that patients all move through the system at the same rate, thereby ignoring this effect of inherent heterogeneity in patient behaviour. The present paper describes the movement of patients through geriatric hospitals by a two-stage continuous-time Markov model, where the stages represent acute/rehabilitative and long-stay patients respectively. Patients are initially admitted to the first stage, from which they may depart from the system, by death or discharge, or move into the second stage, from which they eventually depart by death or discharge (unlikely). Admissions are modelled in two ways: either as replacements for departures or as a Poisson stream. Expressions for the distribution and movement of numbers of patients are derived and evaluated for data from a number of hospitals. Such an approach has the advantage, over previous crude models, of taking into account different types of patients and introducing variability, thus making it possible to extract variances as well as means of numbers of geriatric patients requiring hospital care.
MeSH term(s)	Aged/psychology ; Behavior ; Death ; Humans ; Inpatients/psychology ; Length of Stay ; Long-Term Care ; Markov Chains ; Mathematics ; Models, Statistical ; Rehabilitation ; Stochastic Processes
Language	English
Publishing date	1994
Publishing country	England
Document type	Comparative Study ; Journal Article
ZDB-ID	52486-4
ISSN	0265-0746
ISSN	0265-0746
DOI	10.1093/imammb/11.3.207
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