Historical development of structural ice

Pronk, Arno; Vasiliev, Nicolai; Belis, Jan

doi:10.1201/b20891-45

Cited by 10 publications

(9 citation statements)

References 2 publications

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“…After a 6- to 9-month period the youths resume their regular activities (school, internship, employment) while still receiving outpatient counseling for 6 months. Employees function as coaches: they provide all program components, including individual counseling (Pronk, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…At both sites the fidelity instrument was developed based on previous work (Goense & Ruitenberg, 2015). In line with the steps for identifying core components of intervention as described in Feely et al (2018) and Kirk (2020) the core components were based on the intervention descriptions available in the Dutch national database of effective interventions (Cleef, 2015; Pronk, 2016). According to the steps of developing a practice profile (Metz, 2016) work sessions with professionals and their supervisor were used at each site to define core components and competent delivery (Boendermaker & Goense, 2017).…”

Section: Methodsmentioning

confidence: 99%

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Video Feedback to Enhance Fidelity in Practice-Based Interventions for Young People, a Small-n Study

Boendermaker

Landman

2022

SAGE Open

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Competent delivery of interventions in child and youth social care is important, due to the direct effect on client outcomes. This is acknowledged in evidence-based interventions (EBI) when, post-training, continued support is available to ensure competent delivery of the intervention. In addition to EBI, practice-based interventions (PBI) are used in the Netherlands. The current paper discusses to what extent competent delivery of PBI can be influenced by introducing supervision for professionals. This study used a mixed-method design: (1) A small- n study consisting of six participants in a non-concurrent multiple baseline design (MBL). Professionals were asked to record conversations with clients during a baseline period (without supervision) and an intervention period (with supervision). Visual inspection, the non-overlap of all pairs (NAP), and the Combinatorial Inference Technique (CIT) scores were calculated. (2) Qualitative interviews with the six participants, two supervisors, and one lead supervisor focused on the feasibility of the supervision. Four of six professionals showed improvement in treatment fidelity or one of its sub-scales. Had all participants shown progress, this could have been interpreted as an indication that targeted support of professionals contributes to increasing treatment integrity. Interviews have shown that supervision increased the professionals’ enthusiasm, self-confidence, and awareness of working with the core components of the intervention. The study has shown that supervision can be created for PBI and that this stimulates professionals to work with the core components of the intervention. The heterogeneous findings on intervention fidelity can be the result of supervision being newly introduced.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Video Feedback to Enhance Fidelity in Practice-Based Interventions for Young People, a Small-n Study

Boendermaker

Landman

2022

SAGE Open

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“…15, and an attempt to make a replica of da Vinci's bridge, Fig. 16 [30], also in Juuka, Finland. Figure 16: Render of the da Vinci's bridge in ice [30].…”

Section: Possibilities Of Using Reinforced Ice As a Building Materialsmentioning

confidence: 99%

Use of reinforced ice as alternative building material in cold regions: an overview

2023

Archives of Thermodynamics

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The design of suitable thermophysical properties of reinforced ice as well as employing the novel material in feasible ways represent key aspects towards alternative building sustainability. In this overview research studies dealing with reinforced ice structures have been presented with an emphasis on construction parameters and reinforcement materials of the structures. The main focus of the study is directed to the identification of the main issues related to the construction of reinforced ice structures as well as the environmental and economic impact of such structures. Obtained research data shows that the compressive, tensile, and bending strength of reinforced ice can be increased up to 6 times compared to plain ice. The application of reinforcement materials decreases creep rate, enhances ductility, and reduces brittle behaviour of ice. Assessed reinforced ice structures were mainly found to be environmentally friendly and economically viable. However, in most of the analysed studies construction parameters and physical properties were not defined precisely. The conducted overview indicates the necessity for more comprehensive and more accurate data regarding reinforced ice construction, applied methods, and processes, and preparation of ice composites in general.

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“…Another common way to quantify mechanical fatigue is by analyzing the cumulative changes during a fatigue test such as the elastic stress (σ E ) or the dissipated energy density . These parameters are related to the integral of the stress, eq , or the area normalized dissipated energy, eq , from the beginning of the test ( N = 0) until failure ( N = N f ) and were empirically found to correlate with the number of cycles to failure as shown in eqs and eq . The idea of the parameters of eqs –eqs is to quantify fatigue and to compare materials as a function of molecular topology and morphology.…”

Section: Theorymentioning

confidence: 99%

Effect of Topology and Molecular Properties on the Rheology and Fatigue Behavior of Solid Polystyrene/Polyisoprene Di- and Triblock Copolymers

et al. 2020

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The effect of molecular properties on the rheological and fatigue behaviors of solid polystyrene (PS)/polyisoprene (PI) block copolymers was investigated. Linear model systems of PS–PI (SI), PS–PI–PS (SIS), and PI–PS–PI (ISI) block copolymers were synthesized via anionic polymerization with well-defined molecular structure variation such as block order, PI content, molecular weight, microstructure, and polydispersity. The different block sequences (SI vs SIS vs ISI) result, for similar PI contents, in different microdomain sizes, which correlate with the phase-separated morphologies as quantified via small-angle X-ray scattering (SAXS). The samples were mechanically characterized in the solid state via strain sweep tests to obtain their storage G′(γ0) and loss G″(γ0) moduli at room temperature as well as their nonlinear properties determined via the Fourier transform (FT) of the stress response. The fatigue behavior was determined via strain-controlled oscillatory torsion tests. First, the effect of strain amplitude on the number of cycles to failure was analyzed via Wöhler curves, specifically strain amplitude vs fatigue lifetime. A significant effect of the block sequence order, the microdomain size, and the chain dynamics on fatigue resistance was found. The fatigue resistance of SI diblock with 30 mol % PI outperforms the SIS or ISI triblock copolymer with a similar composition and, compared to neat PS, increases by a factor of 10 and even 4500, respectively. Second, the time-dependent stress response was analyzed via Fourier transform rheology to better quantify the time-dependent behavior of the nonlinear mechanical parameters and to determine quantitative parameters related to failure onset. Since the fatigue tests were performed under large amplitude oscillatory shear (LAOS), higher harmonics were detected and the time evolution was quantified in the FT spectra. Linear parameters such as the storage (G′) and loss (G″) moduli, as well as the third (I 3) harmonic over the fundamental one (I 1), were analyzed, leading to clear indications related to both brittle or ductile failure mechanisms.

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Historical development of structural ice

Cited by 10 publications

References 2 publications

Video Feedback to Enhance Fidelity in Practice-Based Interventions for Young People, a Small-n Study

Video Feedback to Enhance Fidelity in Practice-Based Interventions for Young People, a Small-n Study

Use of reinforced ice as alternative building material in cold regions: an overview

Effect of Topology and Molecular Properties on the Rheology and Fatigue Behavior of Solid Polystyrene/Polyisoprene Di- and Triblock Copolymers

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