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Статті в журналах з теми "Dynamic ageing"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Wasilewska, Ewa. "Starość demograficzna obszarów wiejskich i jej zróżnicowanie." Roczniki Naukowe Ekonomii Rolnictwa i Rozwoju Obszarów Wiejskich 104, no. 3 (December 18, 2017): 75–85. http://dx.doi.org/10.22630/rnr.2017.104.3.23.

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The aim of this paper was denominating of the spatial diversity of the level of demographic ageing and the dynamics of the ageing process of population in the rural areas against the background of this process in cities in Poland. The investigations were conducted for the period of 2000 to 2015. Old age demographic measures were used in static and dynamic terms. There was a considerable variation in the demographic ageing and ageing of the population in the spatial system and in the city-countryside cross-section. A lower level of demographic ageing and a lower dynamics of this process have been observed in rural areas than in cities.

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2

Balík, J., M. Janeček, and J. Mencl. "Dynamic strain ageing in CuNiSn alloys." Czechoslovak Journal of Physics 38, no. 5 (May 1988): 485–87. http://dx.doi.org/10.1007/bf01597459.

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3

Samuel, K. G., S. L. Mannan, and P. Rodriguez. "Another manifestation of dynamic strain ageing." Journal of Materials Science Letters 15, no. 19 (1996): 1697–99. http://dx.doi.org/10.1007/bf00636198.

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4

van Leeuwen, Ingeborg M. M., Julio Vera, and Olaf Wolkenhauer. "Dynamic energy budget approaches for modelling organismal ageing." Philosophical Transactions of the Royal Society B: Biological Sciences 365, no. 1557 (November 12, 2010): 3443–54. http://dx.doi.org/10.1098/rstb.2010.0071.

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Ageing is a complex multifactorial process involving a progressive physiological decline that, ultimately, leads to the death of an organism. It involves multiple changes in many components that play fundamental roles under healthy and pathological conditions. Simultaneously, every organism undergoes accumulative ‘wear and tear’ during its lifespan, which confounds the effects of the ageing process. The scenario is complicated even further by the presence of both age-dependent and age-independent competing causes of death. Various manipulations have been shown to interfere with the ageing process. Calorie restriction, for example, has been reported to increase the lifespan of a wide range of organisms, which suggests a strong relation between energy metabolism and ageing. Such a link is also supported within the main theories for ageing: the free radical hypothesis, for instance, links oxidative damage production directly to energy metabolism. The Dynamic Energy Budgets (DEB) theory, which characterizes the uptake and use of energy by living organisms, therefore constitutes a useful tool for gaining insight into the ageing process. Here we compare the existing DEB-based modelling approaches and, then, discuss how new biological evidence could be incorporated within a DEB framework.

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5

Lv, Yangyong, Pingping Tian, Shuaibing Zhang, Jinshui Wang, and Yuansen Hu. "Dynamic proteomic changes in soft wheat seeds during accelerated ageing." PeerJ 6 (November 2, 2018): e5874. http://dx.doi.org/10.7717/peerj.5874.

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Previous research demonstrated that soft wheat cultivars have better post-harvest storage tolerance than harder cultivars during accelerated ageing. To better understand this phenomenon, a tandem mass tag-based quantitative proteomic analysis of soft wheat seeds was performed at different storage times during accelerated ageing (germination ratios of 97%, 45%, 28%, and 6%). A total of 1,010 proteins were differentially regulated, of which 519 and 491 were up- and downregulated, respectively. Most of the differentially expressed proteins were predicted to be involved in nutrient reservoir, enzyme activity and regulation, energy and metabolism, and response to stimulus functions, consistent with processes occurring in hard wheat during artificial ageing. Notably, defense-associated proteins including wheatwin-2, pathogenesis-related proteins protecting against fungal invasion, and glutathione S-transferase and glutathione synthetase participating in reactive oxygen species (ROS) detoxification, were upregulated compared to levels in hard wheat during accelerated ageing. These upregulated proteins might be responsible for the superior post-harvest storage-tolerance of soft wheat cultivars during accelerated ageing compared with hard wheat. Although accelerated ageing could not fully mimic natural ageing, our findings provided novel dynamic proteomic insight into soft wheat seeds during seed deterioration.

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6

Dekkers, Gijs, and Richard Cumpston. "On weights in dynamic-ageing microsimulation models." International Journal of Microsimulation 5, no. 2 (2011): 59–65. http://dx.doi.org/10.34196/ijm.00072.

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7

Chmielewski, Piotr Paweł. "The dynamic nature of ageing: novel findings, therapeutic avenues and medical interventions." Anthropological Review 83, no. 1 (March 1, 2020): 75–92. http://dx.doi.org/10.2478/anre-2020-0001.

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AbstractAgeing is one of the most complex and difficult problems for humans to face and for science to solve. Although human senescence was viewed as a passive and uncontrollable process of deterioration over time with little or no genetic regulation, the concept that ageing is caused by both genetic and environmental factors is now generally accepted, even though it remains difficult to distinguish between ageing sensu stricto and the effects of age-related diseases. Empirical data show that mechanisms of ageing are highly conserved during evolution. Moreover, it has been established that there are specific molecular ‘instructions’ for ageing, which suggests that a better understanding of the molecular biology of ageing will open new possibilities regarding future interventions. The complexity of ageing diminishes the possibility that any general theory will completely explain this metaphenomenon. Likewise, it is highly unlikely that any medication can stop or reverse human senescence. Nevertheless, ageing as a dynamic and malleable metaphenomenon can be modulated by a variety of influences. The concept of the shrinkage of the homeo-dynamic space with age, i.e. homeostenosis, is especially interesting and intriguing as it shows that novel therapeutic approaches and rational strategies can help delay the onset of the ageing-associated pathologies by enhancing the homeodynamic capabilities of the body. The aim of this article is to present current data from evolutionary and molecular gerontology and discuss them within the ambit of this review which is devoted to the dynamic, emergent and plastic nature of human ageing and implications for future interventions.

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8

Hörnqvist, Magnus, and Birger Karlsson. "Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation." Procedia Engineering 2, no. 1 (April 2010): 265–73. http://dx.doi.org/10.1016/j.proeng.2010.03.029.

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9

Zhong, Hao, Paul A. Rometsch, Qianqian Zhu, Lingfei Cao, and Yuri Estrin. "Effect of pre-ageing on dynamic strain ageing in Al-Mg-Si alloys." Materials Science and Engineering: A 687 (February 2017): 323–31. http://dx.doi.org/10.1016/j.msea.2017.01.051.

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10

Liu, Xing, Hong Yuan Xing, Gang Liu, Wei Fu, and Wen Bo Zeng. "Performance Evaluation of Anti-Ultraviolet Ageing Bitumen with Combined Modification Based on Dynamic Rheological Test." Materials Science Forum 993 (May 2020): 1373–81. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1373.

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Based on the rheological property master curve, a new definition of ageing index was proposed for styrene-butadiene-styrene block copolymer (SBS) modified bitumen. The UV ageing resistance of the combined-modifier modified SBS bitumen was evaluated. Twelve different methods of combined modification were designed with three kinds of modifiers: ultraviolet absorber (Tinuvin 770), organic montmorillonite (OMMT) and layered double hydroxide (LDHs). With modified SBS bitumen, short-term ageing (TFOT) and laboratory ultraviolet ageing (UV) were performed. The dynamic shear rheometer (DSR) was used to perform frequency sweep test on the samples before and after ageing. The rheological property master curve was obtained by fitting the constitutive model equation. Based on the rheological property master curve, a new definition ageing index was proposed for SBS bitumen to evaluate the modified bitumen with different combined-modifier. The results show that the ageing index could effectively evaluate the UV ageing resistance of SBS bitumen. The evaluation results show that the combined-modifier bitumen exhibits better anti-ultraviolet ageing effects than a single modifier. Among them, the combined-modifier modes of 0.3%Tinuvin770+5%OMMT and 0.6%Tinuvin770+2.5%LDHs performed.

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11

Wu, Shao Peng, Ling Pang, and Guo Jun Zhu. "The Effect of Ageing on Rheological Properties and Chemical Conversions of Asphalts." Key Engineering Materials 385-387 (July 2008): 481–84. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.481.

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Asphalt ageing induced by heat, oxidation and ultraviolet (UV) radiation was investigated using various laboratory simulation ageing methods and outdoor ageing. One normal 70 penetration asphalt and its styrene-butadiene-styrene (SBS) modified asphalt were employed to assess the changes in chemical and rheological properties by infrared spectroscopy and dynamic shear rheometer under various ageing conditions, thus the relationship among rolling thin-film oven(RTFO), pressurized ageing vessel (PAV) and UV radiation ageing was distinguished. Experimental results showed that photodegradation caused by outdoor exposure UV ageing of 50~200µm thin films for a month, was found to be the most severe, following by PAV and then RTFO with respects to rehological and chemical changes. Photodegradation effect decreased as the thickness of asphalt film increases. Dynamic shear tests indicated that polymer networks were gradually destroyed during ageing, but the aged SBS modified asphalts still displayed better rheological properties than the corresponding base asphalt. The weight percent of oxygen as carbonyl increased and of SBS as butadiene decreased after ageing based on infrared spectrums. However, chemical and rheological changes were not generally consistent, and ageing susceptibility may be ranked differently when different evaluation methods were used.

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12

Zaina, Silvio, Manel Esteller, Isabel Gonçalves, and Gertrud Lund. "Dynamic epigenetic age mosaicism in the human atherosclerotic artery." PLOS ONE 17, no. 6 (June 3, 2022): e0269501. http://dx.doi.org/10.1371/journal.pone.0269501.

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Accelerated epigenetic ageing, a promising marker of disease risk, has been detected in peripheral blood cells of atherosclerotic patients, but evidence in the vascular wall is lacking. Understanding the trends of epigenetic ageing in the atheroma may provide insights into mechanisms of atherogenesis or identify targets for molecular therapy. We surveyed DNA methylation age in two human artery samples: a set of donor-matched, paired atherosclerotic and healthy aortic portions, and a set of carotid artery atheromas. The well-characterized pan-tissue Horvath epigenetic clock was used, together with the Weidner whole-blood-specific clock as validation. For the first time, we document dynamic DNA methylation age mosaicism of the vascular wall that is atherosclerosis-related, switches from acceleration to deceleration with chronological ageing, and is consistent in human aorta and carotid atheroma. At CpG level, the Horvath epigenetic clock showed modest differential methylation between atherosclerotic and healthy aortic portions, weak association with atheroma histological grade and no clear evidence for participation in atherosclerosis-related cellular pathways. Our data suggest caution when assigning a unidirectional DNA methylation age change to the atherosclerotic arterial wall. Also, the results support previous conclusions that epigenetic ageing reflects non-disease-specific cellular alterations.

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13

Rao,, K. Bhanu Sankara, M. Valsan,, R. Sandhya,, S. L. Mannan,, and P. Rodriguez,. "Dynamic Strain Ageing Effects in Low Cycle Fatigue." High Temperature Materials and Processes 7, no. 2-3 (July 1986): 171–78. http://dx.doi.org/10.1515/htmp.1986.7.2-3.171.

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14

Jia, Yun-Fei, Zhi Quan Zhou, and Renbiao Wu. "Software ageing process as an evolving dynamic system." IET Software 14, no. 6 (December 1, 2020): 702–10. http://dx.doi.org/10.1049/iet-sen.2019.0155.

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15

Boyer, G., L. Laquièze, A. Le Bot, S. Laquièze, and H. Zahouani. "Dynamic indentation on human skinin vivo: ageing effects." Skin Research and Technology 15, no. 1 (February 2009): 55–67. http://dx.doi.org/10.1111/j.1600-0846.2008.00324.x.

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16

Al-Meyah, Khtam, David Marshall, and Paul L. Rosin. "4D Analysis of Facial Ageing Using Dynamic Features." Procedia Computer Science 112 (2017): 790–99. http://dx.doi.org/10.1016/j.procs.2017.08.037.

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17

Srinivas, M., G. Malakondaiah, K. Linga Murty, and P. Rama Rao. "Fracture toughness in the dynamic strain ageing regime." Scripta Metallurgica et Materialia 25, no. 11 (November 1991): 2585–88. http://dx.doi.org/10.1016/0956-716x(91)90073-a.

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18

McCormick, P. G., and Y. Estrin. "Transient flow behaviour associated with dynamic strain ageing." Scripta Metallurgica 23, no. 7 (July 1989): 1231–34. http://dx.doi.org/10.1016/0036-9748(89)90332-3.

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19

Gopinath, K., A. K. Gogia, S. V. Kamat, and U. Ramamurty. "Dynamic strain ageing in Ni-base superalloy 720Li." Acta Materialia 57, no. 4 (February 2009): 1243–53. http://dx.doi.org/10.1016/j.actamat.2008.11.005.

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20

Gasmi, A., M. Gouasmia, and S. Etienne. "Mechanical Relaxations and Transitions in Poly(Vinylidene Fluoride) PVDF." Solid State Phenomena 115 (August 2006): 151–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.151.

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Dynamic mechanical spectroscopy and differential scanning calorimetry measurements carried out on PVDF films are reported. Several mechanical relaxations are observed around - 100° C, -40° C, and 17° C at 1 Hz, respectively. It is shown that thermomechanical treatments induce variation of material morphology as revealed by calorimetry and low-frequency mechanical spectroscopy. The effect of long-term ageing at room temperature is attributed to reversible melting and formation of small crystallites. The molecular rearrangements involved in ageing at room temperature are characterized by a slow dynamics.

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21

Chmielewski, Piotr Paweł. "Human ageing as a dynamic, emergent and malleable process: from disease-oriented to health-oriented approaches." Biogerontology 21, no. 1 (October 8, 2019): 125–30. http://dx.doi.org/10.1007/s10522-019-09839-w.

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Abstract Over the decades, biogerontology has matured as a scientific discipline. Currently, a number of theoretical frameworks are available to researchers when interpreting empirical data. Despite the great progress that has been made, a comprehensive understanding of biological processes that shape ageing is lacking. Senescence is a dynamic, plastic and highly complex metaphenomenon whose aetiology remains unclear. The paucity of information notwithstanding, some researchers promote ‘anti-ageing’ drugs and formulae every now and again. The rationale behind this concept is that ageing can be reduced to a mixture of biochemical reactions. Furthermore, the distinction between ageing and disease has been questioned on the grounds that ageing is the root of age-related diseases. It has been claimed that disease-oriented approaches can help delay ageing and prevent age-related diseases. Although these methods seem incongruous from an evolutionary standpoint, they become popular amongst the public. Moreover, if ageing is classified as a disease, this situation is likely to be exacerbated. Therefore, it is important to recognise the limitations of these reductionist and disease-oriented approaches. Only holistic and evidence-based strategies might be useful in slowing down ageing and preventing age-related diseases in the future.

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22

Anil, Arya, Tomlal Jose E, and Gejo George. "Dynamic mechanical properties and ageing studies of coir-sisal yarn reinforced polypropylene commingled composites." Polymers and Polymer Composites 31 (January 4, 2023): 096739112211501. http://dx.doi.org/10.1177/09673911221150145.

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This work investigates the dynamic mechanical properties (DMA) and ageing behavior of coir-sisal yarn reinforced polypropylene commingled composites. Moreover, the fibres were subjected to various chemical treatments and their effects on DMA and ageing studies were investigated. DMA reveals that the chemical treatment, especially MAPP treatment, enhances the storage and loss modulus values on the other hand it diminishes the mechanical damping coefficient (tan δ) of the composite. Diffusion studies indicates that treated composites shows a much lower apparent percentage weight gain compared to other treated ones. Solar ageing studies shows that accelerated solar ageing deteriorated tensile strength and modulus of PP/coir-sisal yarn composite.

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23

Zhao, Lei, and Jin Wang. "Uncovering the mechanisms of Caenorhabditis elegans ageing from global quantification of the underlying landscape." Journal of The Royal Society Interface 13, no. 124 (November 2016): 20160421. http://dx.doi.org/10.1098/rsif.2016.0421.

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Recent studies on Caenorhabditis elegans reveal that gene manipulations can extend its lifespan several fold. However, how the genes work together to determine longevity is still an open question. Here we construct a gene regulatory network for worm ageing and quantify its underlying potential and flux landscape. We found ageing and rejuvenation states can emerge as basins of attraction at certain gene expression levels. The system state can switch from one attractor to another driven by the intrinsic or external perturbations through genetics or the environment. Furthermore, we simulated gene silencing experiments and found that the silencing of longevity-promoting or lifespan-limiting genes leads to ageing or rejuvenation domination, respectively. This indicates that the difference in depths between ageing and the rejuvenation attractor is highly correlated with worm longevity. We further uncovered some key genes and regulations which have a strong influence on landscape basin stability. A dynamic landscape model is proposed to describe the whole process of ageing: the ageing attractor dominates when senescence progresses. We also uncovered the oscillation dynamics, and a similar behaviour was observed in the long-lived creature Turritopsis dohrnii . Our landscape theory provides a global and physical approach to explore the underlying mechanisms of ageing.

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24

Zhang, Jing, Weidi He, Yifan Wu, Na Wang, Xiaolang Chen, and Jianbing Guo. "The evolution of morphology, crystallization and static and dynamic mechanical properties of long glass-fibre–reinforced polypropylene composites under thermo-oxidative ageing." Journal of Thermoplastic Composite Materials 32, no. 4 (May 2, 2018): 544–57. http://dx.doi.org/10.1177/0892705718772872.

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In this work, the static and dynamic mechanical properties, crystallization behaviours, and morphology of long glass-fibre–reinforced polypropylene (PP) composites with thermo-oxidative ageing time from 0 day to 50 days at 120°C were investigated and discussed. The static mechanical properties showed a global decrease in tensile, bending and impact strengths with increasing ageing time. From the results obtained by scanning electronic microscopic observations, interface debonding clearly occurred between the glass fibre and PP matrix in the aged samples. The crystallinity ( Xc) of the composites was analyzed by differential scanning calorimetry; annealing process played the leading role in the early period of ageing, while as ageing progressed, the degradation of PP matrix dominated the ageing process and Xc decreased. The dynamic mechanical analysis results indicated that the storage modulus and glass transition temperature of the composites also decreased with prolonging ageing time. Then, the apparent activation energy ( E) of glass transition was calculated by the Arrhenius equation with different scanning frequencies. A higher value of E was obtained for the samples in the later ageing period, which means a higher energy barrier for glass transition.

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25

Chai, Guo Cai, Mattias Calmunger, Sten Johansson, Johan Moverare, and Joakim Odqvist. "Influence of Dynamic Strain Ageing and Long Term Ageing on Deformation and Fracture Behaviors of Alloy 617." Materials Science Forum 879 (November 2016): 306–11. http://dx.doi.org/10.4028/www.scientific.net/msf.879.306.

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Influences of dynamic strain ageing and long term ageing on deformation, damage and fracture behaviors of Alloy 617 material have been studied. Dynamic strain ageing can occur in this alloy at temperature from 400 to 700°C, which leads to a strain hardening and also an increase in fracture strain due to plastic deformation caused by twinning. Long term ageing at 700°C for up to 20 000 hours can cause different precipitation such as γ ́, M6C (Mo-rich) and M23C6 (Cr-rich) carbides. These carbides are both inter-and intra-granular particles. The long term ageing reduces the fracture toughness of the material, but the alloy can still have rather high impact toughness and fracture toughness even with an ageing at 700°C for 20 000 hour. The mechanisms have been studied using electron backscatter detection and electron channeling contrast imaging. It shows that besides dislocation slip, twinning is another main deformation mechanism in these aged Alloy 617 materials. At the crack front, plenty of micro or nanotwins can be observed. The formation of these twins leads to a high ductility and toughness which is a new observation or a new concept for this type of material.

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26

Pavan, A. H. V., R. L. Narayan, Shi-Hao Li, Kulvir Singh, and U. Ramamurty. "Mechanical behavior and dynamic strain ageing in Haynes®282 superalloy subjected to accelerated ageing." Materials Science and Engineering: A 832 (January 2022): 142486. http://dx.doi.org/10.1016/j.msea.2021.142486.

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27

Hörnqvist, Magnus, and Birger Karlsson. "Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030." Materials Science Forum 519-521 (July 2006): 883–88. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.883.

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The effects of temperature and strain rate on the mechanical properties of aluminium alloy AA7030 (Al-5.4Zn-1.2Mg) in naturally aged and peak aged condition are investigated, with emphasis on the relation to dynamic strain ageing. It is found that the naturally aged material shows more severe signs of dynamic strain ageing, including inverse strain rate and temperature dependence of flow stress, inverse temperature dependence of the ductility and serrated yielding. The peak aged material also shows signs of dynamic strain ageing, but to a lesser extent, most pronounced through serrated yielding. The observed effects can be qualitatively explained in terms of a thermal activation based model for dislocation glide. Furthermore, inhomogeneous deformation is observed on several size scales ranging from localized glide bands to surface deformation effects (orange peel surface) and macroscopic flow localization in shear bands.

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28

Yeh, Chi-Hsiao, Yi-Ju Chou, Cheng-Heng Kao, and Ting-Fen Tsai. "Mitochondria and Calcium Homeostasis: Cisd2 as a Big Player in Cardiac Ageing." International Journal of Molecular Sciences 21, no. 23 (December 3, 2020): 9238. http://dx.doi.org/10.3390/ijms21239238.

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Анотація:

The ageing of human populations has become a problem throughout the world. In this context, increasing the healthy lifespan of individuals has become an important target for medical research and governments. Cardiac disease remains the leading cause of morbidity and mortality in ageing populations and results in significant increases in healthcare costs. Although clinical and basic research have revealed many novel insights into the pathways that drive heart failure, the molecular mechanisms underlying cardiac ageing and age-related cardiac dysfunction are still not fully understood. In this review we summarize the most updated publications and discuss the central components that drive cardiac ageing. The following characters of mitochondria-related dysfunction have been identified during cardiac ageing: (a) disruption of the integrity of mitochondria-associated membrane (MAM) contact sites; (b) dysregulation of energy metabolism and dynamic flexibility; (c) dyshomeostasis of Ca2+ control; (d) disturbance to mitochondria–lysosomal crosstalk. Furthermore, Cisd2, a pro-longevity gene, is known to be mainly located in the endoplasmic reticulum (ER), mitochondria, and MAM. The expression level of Cisd2 decreases during cardiac ageing. Remarkably, a high level of Cisd2 delays cardiac ageing and ameliorates age-related cardiac dysfunction; this occurs by maintaining correct regulation of energy metabolism and allowing dynamic control of metabolic flexibility. Together, our previous studies and new evidence provided here highlight Cisd2 as a novel target for developing therapies to promote healthy ageing

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29

Meng, Jiang Ying, Li He Qian, Peng Cheng Guo, and Fu Cheng Zhang. "Dynamic Strain Ageing in a Twin-Induced Plasticity Steel." Materials Science Forum 750 (March 2013): 88–91. http://dx.doi.org/10.4028/www.scientific.net/msf.750.88.

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This work was to clarify the characteristics of serrated flow in an austenitic FeMnC twin-induced plasticity (TWIP) steel at room temperature (RT) using both strain- and crosshead displacement-controlled tensile tests. Three types of serrations were observed in strain-controlled but not in displacement-controlled tests, indicating that strain-controlled tensile tests provide more deformation details. The occurrence of the different types of serrations depends on both strain rate and strain level. Type C serrations were observed in TWIP steels at RT for the first time. The critical strain for the onset of serrations exhibits a positive strain rate dependence at higher strain rates, whereas an “inverse” critical strain behavior was observed in the lower strain rate region.

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30

Palčić, Ana, Lavoslav Sekovanić, Boris Subotić, and Josip Bronić. "Zeolite A Synthesis under Dynamic Conditions, after Hydrogel Ageing." Croatica Chemica Acta 85, no. 3 (2012): 297–301. http://dx.doi.org/10.5562/cca2055.

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31

Kubin, L. P., and Y. Estrin. "Dynamic strain ageing and the mechanical response of alloys." Journal de Physique III 1, no. 6 (June 1991): 929–43. http://dx.doi.org/10.1051/jp3:1991166.

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32

Daymond, M. R., and E. C. Oliver. "Intergranular Stress Development in Al during Dynamic Strain Ageing." Journal of Neutron Research 12, no. 1-3 (January 1, 2004): 213–17. http://dx.doi.org/10.1080/10238160410001734702.

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33

Trojanová, Z., P. Lukáč, K. Milička, and Z. Száraz. "Characterisation of dynamic strain ageing in two magnesium alloys." Materials Science and Engineering: A 387-389 (December 2004): 80–83. http://dx.doi.org/10.1016/j.msea.2004.01.068.

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34

Ling, C. P., P. G. McCormick, and Y. Estrin. "A load perturbation method of examining dynamic strain ageing." Acta Metallurgica et Materialia 41, no. 11 (November 1993): 3323–30. http://dx.doi.org/10.1016/0956-7151(93)90061-v.

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35

Engelke, C., and H. Neuhäuser. "Static and dynamic strain ageing in D03 — Ordered Fe3Al." Scripta Metallurgica et Materialia 33, no. 7 (October 1995): 1109–15. http://dx.doi.org/10.1016/0956-716x(95)00339-w.

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36

McCormick, P. G. "Theory of flow localisation due to dynamic strain ageing." Acta Metallurgica 36, no. 12 (December 1988): 3061–67. http://dx.doi.org/10.1016/0001-6160(88)90043-0.

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37

Springer, F., A. Nortmann, and Ch Schwink. "A Study of Basic Processes Characterizing Dynamic Strain Ageing." physica status solidi (a) 170, no. 1 (November 1998): 63–81. http://dx.doi.org/10.1002/(sici)1521-396x(199811)170:1<63::aid-pssa63>3.0.co;2-f.

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38

Mannan, S. L. "Role of dynamic strain ageing in low cycle fatigue." Bulletin of Materials Science 16, no. 6 (December 1993): 561–82. http://dx.doi.org/10.1007/bf02757656.

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39

Putz-Leszczynska, Joanna. "The Influence of Template Ageing on a Dynamic Signature Verification System." Journal of Forensic Document Examination 24 (December 31, 2014): 47–52. http://dx.doi.org/10.31974/jfde24-47-52.

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This paper addresses template ageing in automatic signature verification systems. Handwritten signatures are a behavioral biometric sensitive to the passage of time. The experiments in this paper utilized a database that contains signature realizations captured in three sessions. The last session was captured seven years after the first one. The results presented in this paper show a potential risk of using an automatic handwriting verification system without including template ageing Purchase Article for $10

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40

van Beek, Johannes H. G. M., Thomas B. L. Kirkwood, and James B. Bassingthwaighte. "Understanding the physiology of the ageing individual: computational modelling of changes in metabolism and endurance." Interface Focus 6, no. 2 (April 6, 2016): 20150079. http://dx.doi.org/10.1098/rsfs.2015.0079.

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Ageing and lifespan are strongly affected by metabolism. The maximal possible uptake of oxygen is not only a good predictor of performance in endurance sports, but also of life expectancy. Figuratively speaking, healthy ageing is a competitive sport. Although the root cause of ageing is damage to macromolecules, it is the balance with repair processes that is decisive. Reduced or intermittent nutrition, hormones and intracellular signalling pathways that regulate metabolism have strong effects on ageing. Homeostatic regulatory processes tend to keep the environment of the cells within relatively narrow bounds. On the other hand, the body is constantly adapting to physical activity and food consumption. Spontaneous fluctuations in heart rate and other processes indicate youth and health. A (homeo)dynamic aspect of homeostasis deteriorates with age. We are now in a position to develop computational models of human metabolism and the dynamics of heart rhythm and oxygen transport that will advance our understanding of ageing. Computational modelling of the connections between dietary restriction, metabolism and protein turnover may increase insight into homeostasis of the proteins in our body. In this way, the computational reconstruction of human physiological processes, the Physiome, can help prevent frailty and age-related disease.

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41

Yu, Jian Ying, Yong Sheng Liang, and Zhen Gang Feng. "Investigation of Ultraviolet Ageing on Rheological Characteristics of Bitumen." Applied Mechanics and Materials 71-78 (July 2011): 1954–57. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1954.

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The influence of ultraviolet (UV) ageing on complex modulus, phase angle and low-temperature fatigue factor was studied by dynamic shear rheometer test. The ageing degree of the bitumen was evaluated by the rheological parameters. The results show that UV ageing causes an increase in complex modulus and fatigue factor, as well as a decrease in phase angle, indicating that the bitumen becomes more elastic after UV ageing process and is apt to crack at low temperatures. Different bitumen exhibits diverse changes in the rheological parameters after UV ageing, which is much dependent on the sources of bitumen.

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42

Halamová, Romana, Dalibor Kocáb, Barbara Kucharczyková, Petr Misák, and Martin Alexa. "Influence of the Poisson’s Ratio on the Value of the Dynamic Modulus of Elasticity of Cement Materials in the Early Stage of Ageing." Solid State Phenomena 292 (June 2019): 50–55. http://dx.doi.org/10.4028/www.scientific.net/ssp.292.50.

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The paper deals with the influence of the Poisson’s ratio on the calculated modulus of elasticity of a cementitious composite in the early stage of its ageing. The dynamic modulus of elasticity was determined in the first 24 hours of ageing of the material using the Vikasonic ultrasonic device. Within the experiment, two types of cementitious composites were mixed - cement paste and cement mortar, both having the same water/cement ratio. It is presumed that the value of the dynamic modulus of elasticity calculated on the basis of ultrasonic measurement is closely related to the value of the Poisson’s ratio, which is not constant during ageing of the cementitious composite but varies depending on the degree of hydration of the material. The output of the paper is a comparison of the development of the dynamic modulus of elasticity calculated using different values of the Poisson’s ratio.

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43

Wanka, Anna, Steven Schmidt, and Richard Settersten. "Housing and Life Course Transitions in Later Life: The Role of Housing, Place, and Sense of Home in Periods of Uncertainty." Innovation in Aging 4, Supplement_1 (December 1, 2020): 595–96. http://dx.doi.org/10.1093/geroni/igaa057.2001.

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Abstract Housing is central factor for health and well-being in later life. Many countries have implemented ageing in place policies, but they tend to neglect the dynamic nature and heterogeneity of the ageing process. Housing needs change as people grow older, and experience different transitions across their life courses. Studies have demonstrated relationships between housing and health and wellbeing in later life on the one hand and life transitions and health and wellbeing in later life on the other hand. However, research on life transitions in combination with objective and perceived housing in relation to indicators of good ageing is scarce. Hence, the symposium aims to explore the dynamic relationship between housing and life transitions and how this relationship impacts health, well-being, functioning, and social/neighborhood participation along the process of ageing. First, Anna Wanka and Frank Oswald investigate how older adults’ relationship to their home is interlinked with life-course transitions and social exclusion, presenting case studies from three countries. Maya Kylén explores the meaning of home and health dynamics throughout the retirement transition among the ‘younger old’ in Sweden. Kieran Walsh asks how ‘sense of home’ interrelates with risks entailed in the transitions of bereavement, dementia on-set and forced migration. Finally, Helen Barrie discusses the transition to homelessness based on the HILDA survey to identify the profile(s) of older people at risk of homelessness in Australia. Finally, Richard A. Settersten will discuss the four contributions.

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44

Ying, Mei, and Fan Rui. "Experimental Modal Analysis in Casting Production Applications." Advanced Materials Research 189-193 (February 2011): 4028–32. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4028.

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The experimental modal analysis (EMA) applied in vibrating solidification and vibrating ageing of the cast iron elements has been discussed in this paper. The stimulating frequency、excitation area(wave crest)、supporting area and the way of excitation of this cast iron element can be chosen accurately according to the eigenvalue of vibration parameters and the dynamic display of the measurement. If multiple excitation is needed，the principle natural frequency can be adjusted according to the dynamic display as the partial differences and the characteristics change of the elements. The experiment shown that using EMA excitation parameters can get a better technical effect than those of static solidification、heat ageing or other experience excitation ageing. Vibrating solidification can make a fine crystalline and the hardness of the full section is relative high; Vibrating ageing can get a better stress distribution and raise the ability of anti-deformation.

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45

Zhang, Si Qian, Liang Mao, and Li Jia Chen. "Dynamic Strain Aging during Tensile Deformation of Extruded AZ81 Magnesium Alloy." Advanced Materials Research 652-654 (January 2013): 1937–41. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1937.

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Serrated flow has been observed in AZ81 alloy during tensile deformation. The observed static strain ageing effect and negative strain rate sensitivity suggest that the serrated flow is due to interaction between dislocations and solute atoms, know as dynamic strain ageing (DSA). The Portevin-Le Chatelier effect is observed at temperatures between 150oC~200oC and 125oC~200oC. In the microstructure of deformed samples dislocations and twins is observed. It is suggested that the occurrence of the dynamic strain aging is associated with interactions between solute atoms and dislocations.

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46

Dasek, Ondrej, Petr Hyzl, and Pavel Coufalik. "Properties and Ageing of Crumb Rubber Modified Bitumens." Key Engineering Materials 737 (June 2017): 535–40. http://dx.doi.org/10.4028/www.scientific.net/kem.737.535.

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The issue of reusing waste materials is becoming very current and also includes reusing used tires. One of the possibilities is using these tires for the production of crumb rubber, which is added as a modifying agent into paving bitumens. The paper compares properties of this special type of asphalt binder with properties of conventional binders. In order to test the rheological properties, needle penetration, softening point, dynamic viscosity, resilience and elastic recovery tests were performed. Emphasis was put on description of rheological behavior determined using dynamic shear rheometer with the effects of ageing assessed using RTFOT method. It was found that crumb rubber modified bitumens have a higher stiffness in comparison to both paving and polymer modified bitumens. Ageing of crumb rubber modified bitumens led to an increase of complex shear moduli and decrease of phase angles. Increasing the crumb rubber content in bitumen leads to smaller increase of complex shear modulus due to ageing. It demonstrates higher resistance against ageing.

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47

Alekseyev, S. V., Pavel V. Prudnikov, and Vladimir V. Prudnikov. "Ageing Phenomena in Two-Dimensional XY-Model." Solid State Phenomena 190 (June 2012): 3–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.3.

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The ageing phenomena in two-dimensional XY model at the low temperatures are investigated by Monte-Carlo method. The two-time correlation function and dynamic susceptibility are measured. Violations of the fluctuation-dissipation theorem are investigated.

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48

Kern, Marie Sarah, Andrea Pataki-Hundt, Jan Wouters, and Daniel P. Kirby. "Accelerated Ageing of Parchment: Investigation of a Photo Catalysed, Low-Heat Approach." Restaurator. International Journal for the Preservation of Library and Archival Material 39, no. 1 (April 25, 2018): 33–70. http://dx.doi.org/10.1515/res-2017-0013.

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Abstract Accelerated ageing is an often-used tool in conservation research, yet difficult to apply to parchment due to the materials inherent heat sensitivity. The complexity of this organic material makes the analysis of its deterioration especially challenging. An attempt to develop a non-heat ageing protocol for parchment is described in this paper. The work was performed within the scope of a MA-thesis at the State Academy of Art and Design Stuttgart. Samples of a modern new limed goat parchment and pieces of reconstituted parchment made from bovine hide powder were subjected to a combination of light ageing and dynamic ageing at moderate temperatures. All samples were analysed with the goal to observe degradation on as many structural levels as possible: colour measurement via VIS spectrometry and light-microscopic observation of fibre damage were employed to assess visible changes. Shrinkage temperature (Ts) was measured as an indicator for the amount of intact intrafibrillar bonds and the determination of the maximum moisture absorption capacity gave an impression on the parchments overall level of hygroscopy. In addition, PMF (Peptid Mass Fingerprinting) via MALDI/MS TOF was performed on extracts from unaged and light aged goat parchment. The results of the different types of analysis showed significant degradation on different structural levels of the parchment, indicating that accelerated ageing of parchment that uses a combination of light and dynamic ageing may be a viable alternative to the more commonly applied thermal ageing.

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49

Zhou, Xin Xing, Shao Peng Wu, and Gang Liu. "Surface and Interface of Fine Aggregate Mixture under the Condition of UV-Ageing and Moisture-Treatment." Materials Science Forum 847 (March 2016): 431–36. http://dx.doi.org/10.4028/www.scientific.net/msf.847.431.

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Three-dimensional depth of field microscope (3-D FM), scanning electronic microscope (SEM) and molecular dynamic simulation (MD) were used to evaluate the surface morphology, behaviors and failure mechanisms of mortar and fine aggregate mixture (FAM). The effects of ultraviolet (UV) light and moisture for FAM, the interfacial behaviors of bitumen-aggregate were investigated. Results showed that in the pure mortar, the UV-ageing could increase the adhesion between the bitumen and fine aggregates, and the cohesion failure was dominant after UV-ageing. Due to the lower air voids in the pure mortar, the moisture did not cause the adhesion failure. The molecular dynamic simulation implied that UV ageing and moisture-treatment could reduce the interfacial energy, and the aromatic and asphaltene played a great role in the adhesion between bitumen and aggregate.

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50

Wang, Jian, Lingtong Li, Yong He, Haishuo Song, Xiaolang Chen, and Jianbing Guo. "The effect of thermo-oxidative ageing on crystallization, dynamic and static mechanical properties of long glass fibre-reinforced polyamide 10T composites." Royal Society Open Science 5, no. 6 (June 2018): 172029. http://dx.doi.org/10.1098/rsos.172029.

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The performances and microstructure of long glass fibre-reinforced polyamide 10T (PA10T/LGF) composites that experienced different ageing temperatures (160 and 200°C) with increasing ageing time are characterized by differential scanning calorimetry (DSC), mechanical analysis, thermogravimetric analysis (TGA) and scanning electron microscopy to probe the correlation between properties of the composites and thermo-oxidative ageing. The DSC results show that PA10T/LGF composites occur on degradation, the fracture of molecular chains and the destruction of crystallization structure, which leads to the crystallization and melting peaks of PA10T/LGF composites to shift to high temperature. On the basis of dynamic mechanical analysis data, the reduction of the interfacial bonding between the glass fibre and PA10T matrix and the motion of molecular chain segments result in the thermo-oxidative ageing of composites. According to the calculation of activation energy ( E ), thermo-oxidative temperature and ageing time can bring about the decline of the E value, proving the deterioration in performance of PA10T/LGF composites. In view of TGA, the increase in the thermo-oxidative temperature and ageing time promotes the degradation of PA10T/LGF composites. The tensile, flexural and notched impact strengths of PA10T/LGF composites decline with prolonging the ageing temperature and time. The surface of materials produces some microcracks and the cross-section surface of PA10T/LGF composites becomes rougher.

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