Log in

Relevant bibliographies by topics / Memory span

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Memory span'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Memory span.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Memory span"

1

Groeger, John A., David Field, and Sean M. Hammond. "Measuring Memory Span." International Journal of Psychology 34, no. 5-6 (1999): 359–63. http://dx.doi.org/10.1080/002075999399693.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Turner, Marilyn L., and Randall W. Engle. "Working Memory Capacity." Proceedings of the Human Factors Society Annual Meeting 30, no. 13 (1986): 1273–77. http://dx.doi.org/10.1177/154193128603001307.

Full text

Abstract:

Recent researchers have attempted to correlate measures of working memory (WM) with measures of higher level cognitive skills and abilities focusing on the functions of this limited capacity system, i.e., processing and storage. Relationships between three span measures of the functional model of WM capacity and two measures of reading comprehension were investigated. The magnitude of the correlations found between reading comprehension and the two spans embedded in reading processing tasks was similar to that of the correlation found between a third span measure embedded in a quantitative task with reading comprehension. These results indicated that these span measures of WM capacity were independent of the nature of the concurrent processing task.

APA, Harvard, Vancouver, ISO, and other styles

3

Henry, Lucy A. "The Relationship between Speech Rate and Memory Span in Children." International Journal of Behavioral Development 17, no. 1 (1994): 37–56. http://dx.doi.org/10.1177/016502549401700103.

Full text

Abstract:

Evidence of a linear relationship between speech rate and memory span in children has been obtained in several studies (e.g. Hulme, Thomson, Muir, & Lawrence, 1984). This evidence is used to support an explanation of the development of memory span based on the working memory model (Baddeley, 1990). The model argues that speech rate is related to the amount recalled and that developmental increases in speech rate allow faster rehearsal with age and, hence, greater recall. However, the linear relationship between speech rate and memory span has generally been reported in terms of group means for speech rate and memory span rather than individual level correlations between the two variables. The present studies replicate the group relationship, but find that correlations between individual subject's speech rates and memory spans, when the effects of age are partialled out, are no longer significant. Nor was the size of the word length effect related to the difference in speech rate between short and long words. It is argued that the group mean relationship between speech rate and memory span is clear and replicable, but that the speech rates of individual children are not good predictors of those children's memory spans. The implications of these results for the working memory explanation of span development are discussed.

APA, Harvard, Vancouver, ISO, and other styles

4

Orsini, A., L. Trojano, L. Chiacchio, and D. Grossi. "Immediate Memory Spans in Dementia." Perceptual and Motor Skills 67, no. 1 (1988): 267–72. http://dx.doi.org/10.2466/pms.1988.67.1.267.

Full text

Abstract:

Spatial span (Corsi's block-tapping test) and verbal spans for digits (Wechsler Digits Forward Test) and for words were measured in 30 normal subjects and in 51 demented patients, divided into two groups (mildly demented and severely demented) according to selective clinical and neuropsychological criteria. Statistical analysis showed significant differences among the three groups for spatial span. By contrast, controls' and mildly demented patients' performances on both verbal spans were not significantly different. These findings are discussed in the light of theory about working memory.

APA, Harvard, Vancouver, ISO, and other styles

5

Smyth, Mary M., and Lindsay R. Pendleton. "Working Memory for Movements." Quarterly Journal of Experimental Psychology Section A 41, no. 2 (1989): 235–50. http://dx.doi.org/10.1080/14640748908402363.

Full text

Abstract:

Movement to spatial targets that can, in principle, be carried out by more than one effector can be distinguished from movements that involve specific configurations of body parts. The experiments reported here investigate memory span for a series of hand configurations and memory span for a series of hand movements to spatial locations. Spans were produced normally, or in conditions in which a suppression task was carried out on the right or the left hand while the movements to be remembered were presented. All movements were recalled using the right hand. There were two suppression tasks. One involved repeatedly squeezing a tube and so changing the configuration of the hand, and the other involved tapping a repeated series of spatial targets. The spatial tapping task interfered with span for spatial locations when it was presented on either the right or the left hand but did not affect span for movement pattern. The movement suppression task interfered with memory for movement pattern when it was presented on either the right or the left hand, but did not interfere with span for spatial locations. It is concluded that memory for movement configurations involves different processes from those used in spatial tasks and that there may be a need for a subsystem of working memory that is specific for movement configuration.

APA, Harvard, Vancouver, ISO, and other styles

6

Karpicke, Jeffrey D., and David B. Pisoni. "Using immediate memory span." Memory & Cognition 32, no. 6 (2004): 956–64. http://dx.doi.org/10.3758/bf03196873.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Sallis, John. "The Span of Memory." Epoché 21, no. 2 (2017): 321–33. http://dx.doi.org/10.5840/epoche201722778.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Nairne, James S., and Ian Neath. "Long-term memory span." Behavioral and Brain Sciences 24, no. 1 (2001): 134–35. http://dx.doi.org/10.1017/s0140525x01433929.

Full text

Abstract:

Cowan assumes that chunk-based capacity limits are synonymous with the essence of a “specialized STM mechanism.” In a single experiment, we measured the capacity, or span, of long-term memory and found that it, too, corresponds roughly to the magical number 4. The results imply that a chunk-based capacity limit is not a signature characteristic of remembering over the short-term.

APA, Harvard, Vancouver, ISO, and other styles

9

Talamini, Francesca, Barbara Carretti, and Massimo Grassi. "The Working Memory of Musicians and Nonmusicians." Music Perception 34, no. 2 (2016): 183–91. http://dx.doi.org/10.1525/mp.2016.34.2.183.

Full text

Abstract:

Musicians have superior performances compared to nonmusicians in many auditory perception tasks. This superiority extends to memory tasks such as the digit span. Literature suggests that the musicians’ advantage unfolds along two axes: sensory modality (musicians perform better when the task is auditory) and task complexity (musicians tend to perform better in the forward and not — for example — backward digit span). In addition, it is unclear whether there are specific music abilities linked with improved performance in the digit span. Here, musicians and nonmusicians performed a digit span task that was presented aurally, visually, or audiovisually. The task was performed with or without a concurrent task (i.e., articulatory suppression) in order to explore the role of rehearsal strategies and also manipulate task complexity. Finally, music abilities of all participants were assessed using the Profile of Music Perception Skills (PROMS) test. Musicians had larger spans than nonmusicians regardless of the sensory modality and the concurrent task. In addition, the auditory and audiovisual spans (but not visual) were correlated with one subscale of the PROMS test. Findings suggest a general advantage of musicians over nonmusicians in verbal working memory tasks, with a possible role of sensory modality and task complexity.

APA, Harvard, Vancouver, ISO, and other styles

10

Kunimi, Mitsunobu, and Haruyuki Kojima. "The Effects of Processing Speed and Memory Span on Working Memory." GeroPsych 27, no. 3 (2014): 109–14. http://dx.doi.org/10.1024/1662-9647/a000109.

Full text

Abstract:

This study examined the processing speed and memory span of young adults and older people using tasks based on the Wechsler Adult Intelligence Scale-III (WAIS-III, Wechsler, 1997 ). By comparing the data obtained from these tasks, we examined the effects of processing speed and memory span on working memory (WM). In addition, this study examined how presentation modality and the subject’s age are related to WM. Multiple regression analysis of the effect of memory span for each presentation modality used processing time as a factor to predict the WM span of various age groups. The result was two equations for predicting WM span. According to these equations, WM is negatively correlated with “age group” and “processing time,” and positively correlated with “memory span.” Memory span and processing speed were found to have similar impacts on WM, regardless of the presentation modality. However, our results suggested that visual WM and auditory WM are different functions, and that auditory WM is more strongly affected by memory span than visual WM.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Memory span"

1

Magimairaj, Beula M. "Attentional mechanisms in children's complex memory span performance." Ohio : Ohio University, 2010. http://www.ohiolink.edu/etd/view.cgi?ohiou1267650640.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Lobley, Kathryn J. "Working memory, verbal complex span and reading comprehension." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390791.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Magimairaj, Beula M. "Attentional Mechanisms in Children’s Complex Memory Span Performance." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1267650640.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Broadway, James M. Jr. "Running memory/working memory: span tasks and their prediction of higher-order cognition." Thesis, Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22629.

Full text

Abstract:

Different versions of complex, simple, and running tests of immediate memory span were compared in their ability to predict fluid intelligence (gF). Conditions across memory tasks differed in terms of whether or not a secondary cognitive task was interleaved between to-be-remembered items (complex versus other span tasks), whether or not more items were presented than were ultimately to-be-remembered (running versus other span tasks), and whether presentation rate was relatively fast or slow (running and simple span tasks). Regressions indicated that up to 42.6% of variance in general fluid gF was explained by the memory span measures entered in different combinations. Across comparisons, shared relationships among span tasks accounted for a plurality of total variance in gF. Results indicate that in spite of procedural differences and resulting intra-individual variance in memory performance, the present memory tasks captured largely the same inter-individual variance in working memory capacity, insofar as this is important for higher-order cognition.

APA, Harvard, Vancouver, ISO, and other styles

5

Broadway, Jr James M. "Running memory/working memory span tasks and their prediction of higher-order cognition /." Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22629.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Lejeune, Marc. "Life-span changes in visuo-spatial short term memory." Thesis, University of Stirling, 1997. http://hdl.handle.net/1893/22862.

Full text

Abstract:

Several experiments are presented to evaluate the development of visuo-spatial short term memory from childhood to old age (from five-year-olds to about 70-year-olds). Visuospatial short term memory was assessed through transformational imagery tasks. The first set of experiments (chapters 3, 4 and 5) concerned the development of mental rotation abilities. A review of the literature suggested that young children (specifically so-called preoperational children) and elderly people are poor at rotating a mental image of a visual pattern. However, as some mental rotation abilities have been reported while using Shepard's paradigm, attention was focussed on the role of the first steps necessarily taken while performing a mental rotation task, specifically the maintenance of a visual pattern in STM. The second set of experiments (chapter 6) considered another imagery subsystem, namely "mental scanning". Like mental rotation, it requires the maintenance of a visual pattern in short term memory. Image maintenance ability has been assessed in reference to Kosslyn's (1994) model although Baddeley's (1986) working memory model- specifically, Logie's (1995) revision of the VSSP - has been sometimes considered while interpreting the data. These two different theoretical models suggest the existence of two related but different subsystems for sorting visual and spatial information. Most of the data presented in this thesis suggest that young children and the elderly have some difficulties maintaining spatial characteristics of a visual pattern in short term memory, i.e. the orientation of the stimulus in the mental rotation tasks and the location of targets in the mental scanning tasks. These results tend to provide some developmental evidence for a dissociation between the dorsal and ventral subsystems. It seems that the two subsystems develop at different speeds. The ventral subsystem might be better developed earlier than the dorsal subsystem. Similarly, some data suggest that the same ventral system is not yet affected by ageing when the dorsal subsystem has already begun to deteriorate.

APA, Harvard, Vancouver, ISO, and other styles

7

Roth, Bailey Heather. "Contribution of strategy use to performance on complex and simple span tasks." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1247583267.

Full text

Abstract:

Thesis (Ph.D.)--Kent State University, 2009-07-15.<br>Title from PDF t.p. (viewed Mar. 8, 2010). Advisor: John Dunlosky. Keywords: Working memory; short-term memory; secondary memory; strategy use; fluid intelligence. Includes bibliographical references (p. 56-59).

APA, Harvard, Vancouver, ISO, and other styles

8

Cheung, Sze-man May. "The effect of phonological similarity on the auditory memory span." Click to view the E-thesis via HKUTO, 1995. http://sunzi.lib.hku.hk/hkuto/record/B36209107.

Full text

Abstract:

Thesis (B.Sc)--University of Hong Kong, 1995.<br>"A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, April 28, 1995." Also available in print.

APA, Harvard, Vancouver, ISO, and other styles

9

Dmitsak, Lyndley Anne. "Working Memory Span Differences in the Use of Encoding Strategies." Marietta College / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=marietta1181838212.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

MacQueen, David A. "Non-competitive NMDA receptor antagonist impairs olfactory memory span in rats." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/macqueend/davidmacqueen.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Memory span"

1

J, Young Carole, and Bartlett Brendan J, eds. Memory improved: Reading and memory enhancement across the life span through strategic text structures. Lawrence Erlbaum Associates, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Janet, Metcalfe, ed. Metacognition: A textbook for cognitive, educational, life-span, and applied psychology. Sage Publications, 2009.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Dunlosky, John. Metacognition: A textbook for cognitive, educational, life span, and applied psychology. Sage Publications, 2009.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Dunlosky, John. Metacognition: A textbook for cognitive, educational, life-span, and applied psychology. Sage Publications, 2009.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

Leduc, Stephanie. Room temperature and time of day: Do they affect short-term memory and attention span performance in the classroom? Laurentian University, Department of Psychology, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

de Menezes, Alison Ribeiro. Embodying Memory in Contemporary Spain. Palgrave Macmillan US, 2014. http://dx.doi.org/10.1057/9781137379948.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Herrin, Lamar. Romancing Spain: A memoir. Unbridled Books, 2006.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Alvarez, Fernando J. Bouza. Communication, knowledge, and memory in early modern Spain. University of Pennsylvania Press, 2004.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Viejo-Rose, Dacia. Reconstructing Spain: Cultural heritage and memory after civil war. Sussex Academic Press, 2011.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Legacies of war and dictatorship in contemporary Portugal and Spain. Peter Lang, 2011.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Memory span"

1

Garrido, Sandra, and Jane W. Davidson. "Music Throughout the Life Span." In Music, Nostalgia and Memory. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-02556-4_6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Kurdziel, Laura Burton Faina. "The Memory Function of Sleep Across the Life Span." In Sleep, Memory and Synaptic Plasticity. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2814-5_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Ross, Barbara L., and Cynthia A. Berg. "Examining Idiosyncracies in Script Reports Across the Life Span: Distortions or Derivations of Experience." In Everyday Memory and Aging. Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4613-9151-7_3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Rosenzweig, Mark R. "Learning and neural plasticity over the life span." In Memory consolidation: Essays in honor of James L. McGaugh. American Psychological Association, 2001. http://dx.doi.org/10.1037/10413-014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Reißig, Gunther. "Computation of Discrete Abstractions of Arbitrary Memory Span for Nonlinear Sampled Systems." In Hybrid Systems: Computation and Control. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00602-9_22.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

De Lillo, Carlo. "Variations in the Beneficial Effects of Spatial Structure and Serial Organisation on Working Memory Span in Humans and Other Species." In Processes of Visuospatial Attention and Working Memory. Springer International Publishing, 2019. http://dx.doi.org/10.1007/7854_2019_97.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Tsianos, Nikos, Panagiotis Germanakos, Zacharias Lekkas, Costas Mourlas, and George Samaras. "Working Memory Span and E-Learning: The Effect of Personalization Techniques on Learners’ Performance." In User Modeling, Adaptation, and Personalization. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13470-8_8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Fenerci, Aksel, and Ole Øiseth. "Full-Scale Measurement and Analysis of Wind-Induced Vibrations of a Longs-Span Suspension Bridge in Complex Terrain." In Earthquake Engineering and Structural Dynamics in Memory of Ragnar Sigbjörnsson. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62099-2_13.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Ito, Kenchi. "Low-Power Spin Devices." In Green Computing with Emerging Memory. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0812-3_3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

de Menezes, Alison Ribeiro. "Introduction Embodying Memory in Spain." In Embodying Memory in Contemporary Spain. Palgrave Macmillan US, 2014. http://dx.doi.org/10.1057/9781137379948_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Memory span"

1

Popovic, Miroslav, Branislav Kordic, and Ilija Basicevic. "Work, Span, and Parallelism of Transactional Memory Programs." In 2015 4th Eastern European Regional Conference on the Engineering of Computer Based Systems (ECBS-EERC). IEEE, 2015. http://dx.doi.org/10.1109/ecbs-eerc.2015.18.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Zegers, Jeroen, and Hugo van Hamme. "Memory Time Span in LSTMs for Multi-Speaker Source Separation." In Interspeech 2018. ISCA, 2018. http://dx.doi.org/10.21437/interspeech.2018-2082.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Markowitsch, Hans. "Autobiographical Memory across the Life Span - Brain Imaging and Neuropsychology." In 9th Conference of the Australasian Society for Cognitive Science. Macquarie Centre for Cognitive Science, 2010. http://dx.doi.org/10.5096/ascs200934.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Wang, Zhuowei, Tao Wang, Genpin Zhao, and Jinyao Li. "Coordinated Optimization of the Performance of Processors and Memory in a Heterogeneous System under Energy Constraints." In 2018 15th International Symposium on Pervasive Systems, Algorithms and Networks (I-SPAN). IEEE, 2018. http://dx.doi.org/10.1109/i-span.2018.00025.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Nelson, Boroda, and Lim. "Implementation of a platform-agnostic working memory span task using mobile device technology." In 2016 IEEE Wireless Health (WH). IEEE, 2016. http://dx.doi.org/10.1109/wh.2016.7764562.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Yang, R., J. Antony, P. P. Janes, and A. P. Rendell. "Memory and Thread Placement Effects as a Function of Cache Usage: A Study of the Gaussian Chemistry Code on the SunFire X4600 M2." In 2008 International Symposium on parallel Architectures, Algorighms and Networks I-SPAN. IEEE, 2008. http://dx.doi.org/10.1109/i-span.2008.13.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Peles, Patrícia, Larissa Salvador, Luciano Mariano, et al. "ACCURACY OF NEUROPSYCHOLOGICAL TESTS IN PATIENTS WITH BIOLOGICAL DIAGNOSIS OF ALZHEIMER’S DISEASE." In XIII Meeting of Researchers on Alzheimer's Disease and Related Disorders. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1980-5764.rpda080.

Full text

Abstract:

Background: Neuropsychological tests are important tools for the diagnosis of mild cognitive impairment or dementia due to Alzheimer’s disease (AD). Objective: To investigate the accuracy of common neuropsychological tests used in the clinical setting for AD diagnosis. Methods: Forty two patients with diagnosis of AD continuum [A+T+/-(N)+/-] and 32 non-AD [A-T+/-(N)+/-]. All participants were submitted to a thorough neuropsychological assessment with the following instruments: Mattis Dementia Rating Scale (DRS), Rey’s Auditory Verbal Learning Test (RAVLT), Boston naming-Consortium to Establish a Registry for Alzheimer’s Disease, a reduced version of the CERAD, Digit Span Forward (DSF), Digit Span Backward (DSB) and Cubes from The Wechsler Adult Intelligence Scale (WAIS), verbal fluency – animals (VF-A), and FAS. Results: Memory (MEM) and Initiation/Perseveration (I/P) subscales of the DRS, FAS, Digit Span Backward (DSB) and Boston naming displayed good discrimination between AD and non-AD patients. The MEM subscale of the DRS, RAVLT A6 and FAS presented high sensitivity (90% or more) for AD diagnosis, while DSF displayed high specificity. Non-AD patients had greater difficulty in FAS, DSB and in Boston naming. Conclusion: Performance of patients with biological diagnosis of AD on MEM and I/P of DRS, and RAVLT A7 was significantly different from that of non-AD subjects.

APA, Harvard, Vancouver, ISO, and other styles

8

Anderson, Walter, Ahmadreza Eshghinejad, and Mohammad Elahinia. "Material Characterization and Mid-Span Bending Capacity With Finite Element Simulated Predictions." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5097.

Full text

Abstract:

Intelligent materials have been the subject of research for many years. Shape memory alloys (SMAs) are a type of intelligent material that has been targeted for many different uses; such as actuators, sensors and structural supports. SMAs are attractive as actuators due to their large energy density. Although a great deal of information is available on the axial load capacity and on the tip force for SMA tweezer-like devices, there is not enough information about the load capacity at mid-span, especially at the macro-level. Imposed displacement at mid-span experimental evaluation of an SMA beam in the austenitic and martensitic regimes has been studied. To this end, a specimen of near equi-atomic nitinol was heat-treated (shape set) into a ‘U’ shape and loaded into a custom test fixture such that the boundary conditions of the beam are approximated as roller-roller; and the sample was deformed at different temperatures while reaction forces were measured. The displacement is near maximum displacement of the U shape without causing a change in concavity, thus full-scale capacity is shown. Additionally, Unified Model (finite element) predictions of the experimental response are also presented, with good agreement. Due to the robust nature of the Unified Model, geometric parameter variations (wire diameter and radius of curvature) were then simulated to encompass the design envelop for such an actuator. The material properties needed as inputs to the Unified Model were obtained from constant temperature tensile tests of a specimen subjected to the same heat treatment (shape set straight). The resultant critical stresses were then extracted using the tangent method similar to the one described in ASTM F-2082. It is worth noting that the specimen was trained before the stress value extraction, but the transversely loaded specimen was not trained due to the difficulty involved (inherent uneven stress distribution). The contribution of this work is the presentation of experimental results for transverse (mid-span) loading of a nitinol wire and the simulation results allowing for design of a proper actuator with known constraints on force, displacement or temperature (2 of 3 needed). In other words, this work could be used as a type of 3D look-up table; e.g. for a desired force/displacement, the required temperatures are given. Future work includes developing a sensor-less control strategy for simultaneous force/displacement control.

APA, Harvard, Vancouver, ISO, and other styles

9

Kannarpady, Ganesh K., and A. Bhattacharyya. "Effect of Mechanical and Thermal Cycling on Shape Memory Properties of High Temperature Cu-Al-Ni Single Crystals." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62289.

Full text

Abstract:

With a view towards applications as actuators, the effect of mechanical cycling followed by thermal cycling on 1.5 mm diameter Cu-13.3%Al-4%Ni (by weight) single crystal wires with high stress-free transformation temperatures: Mf = 96°C, Ms = 105.5°C, As = 111.6°C and Af = 115.8°C (determined by the method of tangents) have been studied at different ambient temperatures in the range 25–125°C. The tests are carried out in an Instron machine with an environmental chamber. Stress cycling at a given ambient temperature was carried out for an overall strain of 9% until the stress-strain curves became fairly repeatable. A total of 35 stress cycles were needed to span the ambient temperature range, 25–125°C. The material showed an excellent retention of the shape memory effect in the range of 25–100°C (this is below the Af = 115.8°C of the as-received sample), excellent pseudoelasticity at 125°C, and no irreversible plastic deformation. A net downward shift of transformation temperatures by about 5°C did occur over the first 11 cycles. This was followed by a reversal of the downward shift and the transformation temperatures stabilized by the 35th cycle close to those of the as-received sample. The stabilized temperatures were: Mf = 95°C, Ms = 106.5°C, As = 110°C and Af = 118.5°C (method of tangents). However, the transformation occurred over a wider temperature range as compared to that of the as-received sample, especially during the austenite to martensite transformation on cooling. These features point to the possibility of the Cu-13.3%Al-4%Ni single crystal as a highly competitive candidate for actuator applications.

APA, Harvard, Vancouver, ISO, and other styles

10

Welsch, Felix, Susanne-Marie Kirsch, Nicolas Michaelis, et al. "System Simulation of an Elastocaloric Heating and Cooling Device Based on SMA." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2262.

Full text

Abstract:

Abstract Elastocaloric (EC) cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology. Due to the high specific latent heats activated by mechanical loading/unloading, substantial temperature changes are generated in the material. Accompanied by a small required work input, a high coefficient of performance is achievable. Recently, a fully functional and illustrative continuous operating elastocaloric air cooling system based on SMA was developed and realized. To assist the design process of an optimized device with given performance and efficiency requirements, a fully coupled thermo-mechanical system-level model of the multi-wire cooling unit was developed and implemented in MATLAB. The resulting compact simulation tool is qualified for massively parallel computation, which allows fast and comprehensive parameter studies. In this work, the influence of different SMA diameters, rotation frequencies, and airflow rates is investigated. The results are analyzed to find the suited parameter for high efficiency (COP) and temperature span.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Memory span"

1

Burford, Sandra. Auditory short-term memory span and sequence for five different stimulus types. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.2580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

McCausland, Kathleen. A comparative study of the short-term auditory memory span and sequence of language/learning disabled children and normal children. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.2849.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Tamagawa, Hirohisa. Electro-Spun Fine Fibers of Shape Memory Polymer Used as an Engineering Part. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada513580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!