Alternative Forms of Objectives for the Gifted and Talented Learner in School

Singleton, Haley; Nelson, Murry

doi:10.1177/107621758300300630

Cited by 4 publications

(7 citation statements)

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“…Furthermore, flax/PP composite is heavily deformed and exhibits a more extensive whitening phenomenon. This phenomenon is caused by microvoid nucleation and growth in the polymer [9]. Impact damage in the samples is mainly due to matrix deformation and cracking, failure and fracture of the fibers, fiber/matrix debonding, and fiber pull-out.…”

Section: Drop Weight Impact Test Resultsmentioning

confidence: 99%

“…Many researchers have studied the impact behavior of natural fiber composites. The characterization, in terms of impact strength, is predominantly carried out under inplane impact load using Charpy [1][2][3][4][5][6][7][8][9][10] and Izod [11][12][13][14][15] impact testers. For example, previous studies [1][2][3][4] reported that the Charpy impact strengths of nonwoven hemp fiber/ PP, flax yarn/polylactic acid (PLA), flax fiber mat/PP, and short latania fiber/(PP/ethylene-propylene-diene-monomer) composites, respectively, increase with increasing fiber content, while a decreasing trend in impact strength was observed with increasing fiber content in the case of short fibers (lyocell, hemp, and jute) reinforced polyhydroxybutyrate composites.…”

Section: Introductionmentioning

confidence: 99%

“…In another study, Wambua et al [8] studied the impact strengths of PP composites reinforced with randomly oriented short natural fibers (sisal, kenaf, hemp, jute, and coir) and showed that impact strengths lie in the range of 14-27 kJ/m 2 . Flax fibers play an important role in increasing the impact strength of flax fiber mat/high-density polyethylene (HDPE) composites, with an increase of about 50 kJ/m 2 over the neat HDPE sample [9]. Shah et al [10] investigated the impact strength of UD flax mat-reinforced polyester and epoxy composites and found that epoxy composites show 10-30% lower impact strength than polyester composites.…”

Section: Introductionmentioning

confidence: 99%

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Impact energy absorption of flax fiber‐reinforced polypropylene composites

2017

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This work investigates the effects of fiber content and fiber orientation on the impact behavior of flax fiber‐reinforced polypropylene (PP) composites. The laminates of various fiber contents were manufactured by a vacuum bagging process; their impact properties were then measured using Charpy (i.e., in‐plane impact load) and drop weight (i.e., out‐of‐plane impact load) impact tests. Experiments were conducted on a range of samples with different fiber volume fractions and orientations. The results show significant variations in energy absorption according to the variations in fiber orientation. Composites with differing fiber orientations exhibit different energy absorption for the in‐plane and out‐of‐plane impact loads. The maximum Charpy energy absorption is obtained for the case of 0° fiber orientation, with the energy absorption generally lying in the range of 25–171 J/m. For the out‐of‐plane impact, the composites containing 30° fiber orientation absorb the highest amount of impact energy, and they can offer a better impact resistance in terms of higher peak force. The energy absorption generally lies in the range of 20–32 J. It was found that the energy absorption increases with increasing fiber content in the former (i.e., in‐plane impact load) and decreases in the latter (i.e., out‐of‐plane impact load). Fiber orientations influence the crack propagation and failure mode of the composites. The outcomes from this study indicate that flax fiber‐reinforced composite could be a commercially viable material for lightweight, crashworthy, and impact‐critical structures. POLYM. COMPOS., 39:4165–4175, 2018. © 2017 Society of Plastics Engineers

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Section: Drop Weight Impact Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact energy absorption of flax fiber‐reinforced polypropylene composites

2017

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“…Guidance allows for “comforters and carers” to legally exceed the normal radiation dose limits, providing that they do so knowingly and willingly (i.e. doses have been estimated and explained to them) (Singleton et al , 2003). Available evidence indicates that the dose for companions waiting with a patient in the FDG uptake phase is surprisingly low (Singleton et al , 2003), suggesting scope for increased flexibility regarding the presence of carers throughout PET scans with vulnerable patient groups, such as people with dementia.…”

Section: Discussionmentioning

confidence: 99%

Is there a preference for PET or SPECT brain imaging in diagnosing dementia? The views of people with dementia, carers, and healthy controls

Bamford

Olsen

Davison

et al. 2015

Int. Psychogeriatr.

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Most participants viewed PET and SPECT scans as roughly equivalent and did not have a preference for either scan. Carer preference for SPECT is likely to reflect their desire to be with the patient (routine practice for SPECT but not for PET), suggesting that they should be able to accompany vulnerable patients throughout imaging procedures wherever possible. Pulse rate data indicated that brain imaging was no more stressful than a home visit (HV) from a researcher. The data do not support the anecdotal view that PET is a more burdensome procedure and the use of PET or SPECT scans in dementia should be based on diagnostic accuracy of the technique.

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“…Although choanal atresia is well documented in humans (Baker 1953; Singleton and Hardcastle 1968;Evans and Maclachlas 1971), it has seldom been recognised in domestic animals. There have been isolated reports of its occurrence in sheep (Dennis 1975), a llama (Fenwick, Fowler and Koch 1982) and, on one previous occasion, in a foal (Crouch and Morgan 1983).…”

Section: Discussionmentioning

confidence: 99%