Temat: plasticity - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Transcranial Magnetic Stimulation and Transcranial Electric Stimulation: applications in Neurology and Psychiatry
Transkrania magneta stimulado kaj transkrania elektra stimulado: aplikadoj en Neŭrologio kaj Psikiatrio
Autorzy:: BRASIL–NETO, Joaquim P.
Tematy:: brain plasticity; Pokaż więcej
Data publikacji:: 2014
Powiązania:: https://bibliotekanauki.pl/articles/1033763.pdf Link otwiera się w nowym oknie
Źródło:: Medicina Internacia Revuo; 2014, 26, 103; 106-109
0465-5435
Pojawia się w:: Medicina Internacia Revuo
Opis:: Cerebral plasticity plays an important role in learning and in neurological recovery after nervous lesions. However, in certain nervous diseases that same plasticity may lead to nervous system malfunction. Nowadays there are new methods that seem to be able to modulate nervous system function, namely transcranial magnetic stimulation and transcranial direct current stimulation. By use of these methods it may be possible, for example, to transiently improve learning and other mental abilities in normal volunteers or to treat symptoms of maladaptive brain plasticity in various neurological and psychiatric conditions. In this article we review the history, the fundamentals and the most important uses of these techniques.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of the surface topography on the cell-differentiation effect
Autorzy:: Lackner, J. M.
Major, R.
Tematy:: plasticity
cells
therapy; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/284478.pdf Link otwiera się w nowym oknie
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 22
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of material thickness on the ductile fracture of steel plates for shipbuilding
Autorzy:: Jakub, Kowalski
Janusz, Kozak
Tematy:: ductility
toughness
plasticity
CTOD; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/32912848.pdf Link otwiera się w nowym oknie
Źródło:: Polish Maritime Research; 2022, 3; 160-166
1233-2585
Pojawia się w:: Polish Maritime Research
Opis:: In the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarctic zones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certified materials with a specific impact strength, determined using the Charpy method (for a given design temperature) and by exercising control over the welding processes (technology qualification, production supervision, and non-destructive tests). However, for offshore constructions, such requirements may prove insufficient. For this reason, regulations employed in constructing offshore structures require conducting crack tip opening displacement (CTOD) tests for steel and welded joints with thicknesses exceeding 40 mm for high tensile strength steel and 50 mm for other steel types. Since classification codes do not accept the results of CTOD tests conducted on specimens of sub-sized dimensions, the problem of theoretically modelling the steel construction destruction process is of key importance, as laboratory tests for notched elements of considerable thickness (100 mm and higher) are costly and problems stemming from high loads and a wide range of recorded parameters are not uncommon. The aim of this research is to find a relationship between material thickness and CTOD value, by establishing and verifying a numerical model that allows recalculating a result obtained on a sub-size specimen to a full- size specimen for a ductile fracture mode. This work presents results and conclusions from numerical modelling and compares them with laboratory test results of the elastic-plastic properties of high thickness steel, typically used in offshore applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stem cell biology - a never ending quest for understanding.
Autorzy:: Majka, Marcin
Kucia, Magdalena
Ratajczak, Mariusz
Tematy:: stem cells
TCSC
plasticity; Pokaż więcej
Data publikacji:: 2005
Powiązania:: https://bibliotekanauki.pl/articles/1041413.pdf Link otwiera się w nowym oknie
Źródło:: Acta Biochimica Polonica; 2005, 52, 2; 353-358
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Opis:: Stem cells (SC) research is an important part of biotechnology that could lead to the development of new therapeutic strategies. A lot of effort has been put to understand biology of the stem cells and to find genes and subsequently proteins that are responsible for their proliferation, self-renewal and differentiation. Different cytokines and growth factors has been used to expand stem cells, but no combination of these factors was identified that could effectively expand the most primitive stem cells. Recently, however, genes and receptors responsible for SC proliferation and differentiation have been described. Ligands for these receptors or these genes themselves are being already used for ex vivo expansion of stem cells and the first data are very promising. New markers, such as CXCR4 and CD133, have been discovered and shown to be present on surface of hematopoietic stem cells. The same markers were recently also found to be expressed on neuronal-, hepatic- or skeletal muscle-stem cells. By employing these markers several laboratories are trying to isolate stem cells for potential clinical use. New characteristics of stem cells such as transdifferentiation and cell fusion have been described. Our team has identified a population of tissue committed stem cells (TCSC). These cells are present in a bone marrow and in other tissues and they can differentiate into several cell types including cardiac, neural and liver cells.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Psychedelics – a better alternative for depression treatment?
Psychodeliki - lepsza alternatywa leczenia depresji?
Autorzy:: Gołembiowska, Krystyna
Tematy:: psychedelics
depression
brain plasticity; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2121390.pdf Link otwiera się w nowym oknie
Źródło:: Nauka; 2021, 4; 93-104
1231-8515
Pojawia się w:: Nauka
Opis:: Psychedelics, as a plant-derived material, have been used for millennia in reli- gious and medical practices. They produce an altered state of consciousness characterized by distortions of perception, hallucinations, dissolution of self boun- daries and the experience of unity with the world. Classic psychedelics, also known as serotonergic hallucinogens, such as lysergic acid diethylamide (LSD) and psilocybin were extensively investigated in substance-assisted psychotherapy during the 1950s–1960s. These early clinical studies reported improvement rates in patients with various forms of depression, anxiety disorders, alcohol dependen- ce. The development of modern neuroimaging techniques renewed interest in the investigation of psychedelics as a class of drugs that may reopen multiple the- rapeutic benefits. Current behavioral and neurochemical data show that psy- chedelics induce their psychological effects primarily via 5-hydroxytryptamine type 2A (5-HT2A) receptor activation and modulate neural circuits involved in mood and affective disorders. Clinical trials examining psilocybin have suggested that the compound relieves symptoms of depression and anxiety with rapid onset and longer duration. Serotonergic psychedelics enhance expression of neurotro- phic factors such as brain-derived neurotrophic factor (BDNF) as well as expres- sion of genes associated with synaptic plasticity and stimulate synapse formation. These effects are similar to those produced by fast-acting antidepressant keta- mine. Basic science research can reveal the neural mechanism of psychedelics action and how they can be used for treatment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Application of a geometrically nonlinear elastoplastic gradient-enhanced damage model with incremental potential to composite microstructures
Autorzy:: Boussetta, H.
Dittmann, J.
Wulfinghoff, S.
Tematy:: damage
plasticity
cracks
composites
toughening; Pokaż więcej
Data publikacji:: 2021
Powiązania:: https://bibliotekanauki.pl/articles/38628726.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Mechanics; 2021, 73, 5-6; 499-540
0373-2029
Pojawia się w:: Archives of Mechanics
Opis:: The prediction of inelastic processes like plastic deformations and cracks within the microstructure of modern man-made materials by realistic, yet simple and efficient continuum models remains a major task in material modelling. For this purpose, gradient-extended standard dissipative solids represent one of the most promising model classes, which is also formulated and applied in this work to investigate microscopic failure mechanisms in three exemplary three-dimensional composite microstructures. The model combines geometrically nonlinear isotropic elastoplasticity with an isotropic damage model with gradient-extension. For the numerical treatment, a variational constitutive update algorithm based on the exponential map is applied. The model is used to provide insight into the microscopic failure of a brittle woven composite material, a particle-reinforced plastic and a carbon fiber reinforced composite. The influence of different microstructural and material parameters on the overall failure behavior is characterized. Adaptive meshing is used to enable a refined numerical resolution of the cracked regions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Material definition to design vehicle components, application to crashworthiness
Autorzy:: Rusinek, Alexis
Zaera, Ramon
Tematy:: Elastic waves
plasticity
impact
crash; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/504184.pdf Link otwiera się w nowym oknie
Źródło:: Logistics and Transport; 2018, 38, 2; 63-68
1734-2015
Pojawia się w:: Logistics and Transport
Opis:: In this paper a short description is reported allowing to take into account some aspects to design structures used for automotive industries. It allows to define correctly the behaviour of a vehicle and mainly the passive structures to absorb energy during an accident or an impact. The main aspect related to the behaviour is the strain rate sensitivity coupled to the process of elastic wave propagation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Modeling learning on dynamic behaviour of synapses
Autorzy:: Fernando, S.
Cho, Y. I.
Nakamura, Y.
Matsuzaki, S.
Marasinghe, A.
Tematy:: nauczanie
krótkoterminowa plastyczność
długoterminowa plastyczność
plastyczność synaptyczna
learning
short-term plasticity
long-term plasticity
agent systems; Pokaż więcej
Data publikacji:: 2009
Powiązania:: https://bibliotekanauki.pl/articles/333128.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Medical Informatics & Technologies; 2009, 13; 175-180
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Opis:: Learning is a process involved in multiple timescales. As per biology, changes which last from milliseconds to seconds and hours to days are the main mediators for the formation of short-term and long-term memory. It is obvious that, memory formation is neither static nor it is restricted into a one phase of life. Every step we keep in our life, even it succeed or fail or no matter what happen, we learn from them and acquire invaluable knowledge on that, which makes us easy manipulation on similar events in future. Thus continuous learning in a dynamic environment is a necessary qualification for the researches which are interested in studying phenomena, such as addiction, stress, noise, etc on such a dynamic learning environments. This research proposes a new approach of modelling our nervous system with the intention of implementing learning on dynamic environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Pattern classification by spiking neural networks combining self-organized and reward-related spike-timing-dependent plasticity
Autorzy:: Nobukawa, Sou
Nishimura, Haruhiko
Yamanishi, Teruya
Tematy:: spiking neural network
spike timing-dependent plasticity
dopamine-modulated spike timing-dependent plasticity
pattern classification; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/91886.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Artificial Intelligence and Soft Computing Research; 2019, 9, 4; 283-291
2083-2567
2449-6499
Pojawia się w:: Journal of Artificial Intelligence and Soft Computing Research
Opis:: Many recent studies have applied to spike neural networks with spike-timing-dependent plasticity (STDP) to machine learning problems. The learning abilities of dopaminemodulated STDP (DA-STDP) for reward-related synaptic plasticity have also been gathering attention. Following these studies, we hypothesize that a network structure combining self-organized STDP and reward-related DA-STDP can solve the machine learning problem of pattern classification. Therefore, we studied the ability of a network in which recurrent spiking neural networks are combined with STDP for non-supervised learning, with an output layer joined by DA-STDP for supervised learning, to perform pattern classification. We confirmed that this network could perform pattern classification using the STDP effect for emphasizing features of the input spike pattern and DA-STDP supervised learning. Therefore, our proposed spiking neural network may prove to be a useful approach for machine learning problems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Właściwości plastyczne półwyrobów z miedzi wykonanych metodami dużych odkształceń plastycznych
Plastic properties of semi-products made of copper by the methods of severe plastic deformation
Autorzy:: Andrzejewski, D.
Wendland, J.
Borowski, J.
Pachla, W.
Tematy:: ECAP
wyciskanie hydrostatyczne
plastyczność
hydroextrusion
plasticity; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/211907.pdf Link otwiera się w nowym oknie
Źródło:: Obróbka Plastyczna Metali; 2011, 22, 3; 153-162
0867-2628
Pojawia się w:: Obróbka Plastyczna Metali
Opis:: W artykule przedstawiono wyniki badań plastyczności półwyrobów z miedzi i wytworzonych technikami wykorzystującymi intensywne odkształcanie plastyczne (SPD) tj.: przeciskanie przez kanał kątowy (ECAP) oraz wyciskanie hydrostatyczne (HE). Próby ściskania prowadzono z różną prędkością (0,1; 0,01 oraz 0,001 s-1) oraz w różnej temperaturze (od temperatury otoczenia do 400 oC). Celem badań było określanie plastyczności i zdolności do dalszego kształtowania wyrobów gotowych z półwyrobów uzyskanych za pomocą technik SPD z zachowaniem ich unikalnych właściwości mechanicznych i strukturalnych.
In this article, the results of determination of plasticity of semi-products made of copper by the methods of severe plastic deformation (SPD) tj.: Equal Chanel Angular Pressing (ECAP) and Hydroextrusion (HE) are presented. The compression tests have been made with different speed (0,1; 0,01 and 0,001 s-1) and at different temperature (from ambient temperature up to 400 oC). The tests have been made to determine the plasticity and possibility of further forming of final products from materials obtained by the SPD methods, in such a way as to maintain their unique mechanical properties and structure.
Dostawca treści:: Biblioteka Nauki

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