Relevant bibliographies by topics / Mechanical activation

Academic literature on the topic 'Mechanical activation'

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Published: 4 June 2021
Last updated: 22 February 2023

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Journal articles on the topic "Mechanical activation"

1

Boldyrev, Vladimir V. "Mechanochemistry and Mechanical Activation." Materials Science Forum 225-227 (July 1996): 511–20. http://dx.doi.org/10.4028/www.scientific.net/msf.225-227.511.

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Welham, N. J., and P. G. Chapman. "Mechanical activation of coal." Fuel Processing Technology 68, no. 1 (October 2000): 75–82. http://dx.doi.org/10.1016/s0378-3820(00)00106-5.

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Baláž, P. "Mechanical activation in hydrometallurgy." International Journal of Mineral Processing 72, no. 1-4 (September 2003): 341–54. http://dx.doi.org/10.1016/s0301-7516(03)00109-1.

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Kleiv, R. A., and M. Thornhill. "Mechanical activation of olivine." Minerals Engineering 19, no. 4 (April 2006): 340–47. http://dx.doi.org/10.1016/j.mineng.2005.08.008.

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Mucsi, Gábor. "Mechanical activation of power station fl y ash by grinding – A review." Epitoanyag - Journal of Silicate Based and Composite Materials 68, no. 2 (2016): 56–61. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2016.10.

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Nikolić, Violeta, Miroslav Komljenović, Nataša Džunuzović, and Tijana Ivanovic. "The Influence of Mechanical Activation of Fly Ash on the Toxic Metals Immobilization by Fly Ash-Based Geopolymers." Key Engineering Materials 761 (January 2018): 3–6. http://dx.doi.org/10.4028/www.scientific.net/kem.761.3.

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This paper investigates the influence of mechanical activation of fly ash on the toxic metals immobilization by fly ash-based geopolymers. Fly ash was firstly mechanically and then alkali-activated. Mechanical activation of fly ash was conducted in a planetary ball mill. Alkali activation of fly ash was carried out at room temperature by use of sodium silicate solution as an activator. Toxic metals (Pb and Cr) were added in the form of water soluble salts during the synthesis of geopolymers. The immobilization process was assessed via investigation of the mechanical and leaching properties of geopolymers. Structural changes of geopolymers during the toxic metals immobilization were assessed by means of gas adsorption and SEM analyses. Mechanical activation of fly ash led to a significant increase in geopolymer strength and to a reduced leaching of toxic metals from geopolymers.
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Heah, Cheng Yong, Hussen Kamarudin, Mohd Mustafa Al Bakri Abdullah, Mohammed Binhussain, Luqman Musa, Ismail Khairul Nizar, Che Mohd Ruzaidi Ghazali, and Y. M. Liew. "Effect of Mechanical Activation on Kaolin-Based Geopolymers." Advanced Materials Research 479-481 (February 2012): 357–61. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.357.

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Raw materials kaolin was subjected to mechanical modification; the effect of the mechanical activation of kaolin on the compressive strength and morphological properties of the geopolymers has been studied. Mechanical activation of the kaolin results in particle size reduction and morphology changes with increase in reactivity. Mechanical activated kaolin has overall higher strength gain compared to raw kaolin. Wider particle size distribution and some spherical particles produced, promote a higher packaging density in the sample resulting in higher strength obtained. Mechanically activation of kaolin can be considered as an alternative method to achieve better geopolymerization reaction for kaolin-based geopolymer.
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Kajdas, Czesław. "Mechanical Activation of Chemical Process." Materials Sciences and Applications 06, no. 01 (2015): 60–67. http://dx.doi.org/10.4236/msa.2015.61008.

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Hara, Y., K. Ishizuka, K. KinositaJr., M. Yoshida, and H. Noji. "Mechanical Activation of F_1-motor." Seibutsu Butsuri 43, supplement (2003): S97. http://dx.doi.org/10.2142/biophys.43.s97_3.

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Gbureck, Uwe, Jake E. Barralet, Michael Hofmann, and Roger Thull. "Mechanical Activation of Tetracalcium Phosphate." Journal of the American Ceramic Society 87, no. 2 (February 2004): 311–13. http://dx.doi.org/10.1111/j.1551-2916.2004.00311.x.

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Dissertations / Theses on the topic "Mechanical activation"

1

Quinlan, Angela. "Mechanical Activation Of Valvular Interstitial Cell Phenotype." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/355.

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"During heart valve remodeling, and in many disease states, valvular interstitial cells (VICs) shift to an activated myofibroblast phenotype which is characterized by enhanced synthetic and contractile activity. Pronounced alpha smooth muscle actin (alpha-SMA)-containing stress fibers, the hallmark of activated myofibroblasts, are also observed when VICs are placed under tension due to altered mechanical loading in vivo or during in vitro culture on stiff substrates or under high mechanical loads and in the presence of transforming growth factor-beta 1 (TGF-beta 1). The work presented herein describes three distinct model systems for application of controlled mechanical environment to VICs cultured in vitro. The first system uses polyacrylamide (PA) gels of defined stiffness to evaluate the response of VICs over a large range of stiffness levels and TGF-beta 1 concentration. The second system controls the boundary stiffness of cell-populated gels using springs of defined stiffness. The third system cyclically stretches soft or stiff two-dimensional (2D) gels while cells are cultured on the gel surface as it is deformed. Through the use of these model systems, we have found that the level of 2D stiffness required to maintain the quiescent VIC phenotype is potentially too low for a material to both act as matrix to support cell growth in the non-activated state and also to withstand the mechanical loading that occurs during the cardiac cycle. Further, we found that increasing the boundary stiffness on a three-dimensional (3D) cell populated collagen gel resulted in increased cellular contractile forces, alpha-SMA expression, and collagen gel (material)stiffness. Finally, VIC morphology is significantly altered in response to stiffness and stretch. On soft 2D substrates, VICs cultured statically exhibit a small rounded morphology, significantly smaller than on stiff substrates. Following equibiaxial cyclic stretch, VICs spread to the extent of cells cultured on stiff substrates, but did not reorient in response to uniaxial stretch to the extent of cells stretched on stiff substrates. These studies provide critical information for characterizing how VICs respond to mechanical stimuli. Characterization of these responses is important for the development of tissue engineered heart valves and contributes to the understanding of the role of mechanical cues on valve pathology and disease onset and progression. While this work is focused on valvular interstitial cells, the culture conditions and methods for applying mechanical stimulation could be applied to numerous other adherent cell types providing information on the response to mechanical stimuli relevant for optimizing cell culture, engineered tissues or fundamental research of disease states."
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Andersson-Östling, Henrik C. M. "Mechanical Properties of Welds at Creep Activation Temperatures." Doctoral thesis, KTH, Materialvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12077.

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Welds in materials intended for service at temperatures above the creep activation temperature often develop damage before the base metal. The weld is a discontinuity in the material and stresses and strains often accumulate in the weld. Knowledge of the properties of the weld is essential to the safe operation of the component containing the weld. The work in this thesis has been aimed at the study of welds in service at high temperatures: The work is divided into two main chapters. The first chapter deals with welds in stainlesssteels and dissimilar metal welds and includes three papers, and the second chapter dealswith welds in copper intended for nuclear waste disposal, also including three papers. Common to both parts is that the temperature is high enough for most of the damage in the welds to result from creep. In the first part the role of the weld microstructure on the creep crack propagation properties has been studied. Experiments using compact tension specimens have been performed on service exposed, low alloyed heat resistant steels. The results show good correlation with the crack tip parameter, C*, during steady state creep crack growth. The test methodology has also been reviewed and sensitive test parameters have been identified. The results from the creep crack propagation tests on service exposed material has been modeled using uniaxial creep data on both new and ex-service material. The development of the weld microstructure in a dissimilar metal weld between two heat resistant steels has also been investigated. A weld was made between one ferritic and one martensitic steel and the development of the microstructure during welding and post-weldheat treatments has been studied. The results show that the carbon depleted zone that develops near the weld metal in the lower alloyed steel depends on the formation and dissolution of the M23C6-carbide. Variations of the weld parameters and the post-weld heat treatment affect the size and shape of this zone. The process has been successfully modeled by computer simulation. The second part focuses on oxygen free copper intended for nuclear waste disposal containers. The containers are made with an inner core of cast nodular iron and an outer core of copper for corrosion protection. The copper shell has to be welded and two weld methods has been tested, electron beam welding and friction stir welding. Creep specimens taken from both weld types have been tested as have base metal specimens. The technical specifications of the waste canisters demand that the creep ductility of both the copper shell and the welds has to be as high as possible. The creep test results show that base material doped with at least 30 ppm phosphorus has high creep ductility, and friction stir welds made from this material has almost as high creep strength and creep ductility. Copper without phosphorus does not exhibit the same ductility. The creep properties evaluated from testing has been modeled and extrapolated for the intended purpose
QC20100719
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Throm, Quinlan Angela M. "Mechanical Activation of Valvular Interstitial Cell Phenotype: A Dissertation." eScholarship@UMMS, 2012. https://escholarship.umassmed.edu/gsbs_diss/640.

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During heart valve remodeling, and in many disease states, valvular interstitial cells (VICs) shift to an activated myofibroblast phenotype which is characterized by enhanced synthetic and contractile activity. Pronounced alpha smooth muscle actin (αSMA)-containing stress fibers, the hallmark of activated myofibroblasts, are also observed when VICs are placed under tension due to altered mechanical loading in vivo or during in vitro culture on stiff substrates or under high mechanical loads and in the presence of transforming growth factor-beta1 (TGF-β1). The work presented herein describes three distinct model systems for application of controlled mechanical environment to VICs cultured in vitro. The first system uses polyacrylamide (PA) gels of defined stiffness to evaluate the response of VICs over a large range of stiffness levels and TGF-β1 concentration. The second system controls the boundary stiffness of cell-populated gels using springs of defined stiffness. The third system cyclically stretches soft or stiff two-dimensional (2D) gels while cells are cultured on the gel surface as it is deformed. Through the use of these model systems, we have found that the level of 2D stiffness required to maintain the quiescent VIC phenotype is potentially too low for a material to both act as matrix to support cell growth in the non-activated state and also to withstand the mechanical loading that occurs during the cardiac cycle. Further, we found that increasing the boundary stiffness on a three-dimensional (3D) cell populated collagen gel resulted in increased cellular contractile forces, αSMA expression, and collagen gel (material) stiffness. Finally, VIC morphology is significantly altered in response to stiffness and stretch. On soft 2D substrates, VICs cultured statically exhibit a small rounded morphology, significantly smaller than on stiff substrates. Following equibiaxial cyclic stretch, VICs spread to the extent of cells cultured on stiff substrates, but did not reorient in response to uniaxial stretch to the extent of cells stretched on stiff substrates. These studies provide critical information for characterizing how VICs respond to mechanical stimuli. Characterization of these responses is important for the development of tissue engineered heart valves and contributes to the understanding of the role of mechanical cues on valve pathology and disease onset and progression. While this work is focused on valvular interstitial cells, the culture conditions and methods for applying mechanical stimulation could be applied to numerous other adherent cell types providing information on the response to mechanical stimuli relevant for optimizing cell culture, engineered tissues or fundamental research of disease states.
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Ni, Xinchen. "Activation of conductive pathways via deformation-induced instabilities." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92170.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
"June 2014." Cataloged from PDF version of thesis.
Includes bibliographical references.
Inspired by the pattern transformation of periodic elastomeric cellular structures, the purpose of this work is to exploit this unique ability to activate conductive via deformation-induced instabilities. Two microstructural features, the contact nub and the conductive pathway, are introduced to make connections within the void and between the voids upon pattern transformation. Finite element-based micromechanical models are employed to investigate the effects of the contact nub geometries, conductive pathway patterns and elastic properties of the coating and substrate materials on the buckling responses of the structure. Finally, a flexible circuit that can be switched on and off by an applied uniaxial load is fabricated based on the finite element analysis and demonstrated the ability to activate conductive pathways in response to an external triggering stimulus.
by Xinchen Ni.
S.M.
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5

Depasquale, Roberto. "Mechanical activation of secondary processed orally inhaled active pharmaceutical ingredients." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665449.

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The physicochemical properties and surface chemistry of orally inhaled active pharmaceutical ingredients (API) are critical to the quality attributes of dry powder inhaler (DPI) formulations. The requirement to reduce the particle size distribution of the APIs to a respirable range, largely performed through air-jet micronisation, imparts large amounts of energy to the drug particles, which together with particle fracture and size reduction, it is accompanied by the generation of structural defects and, at the limit, the formation of amorphous regions. This is known as mechanical activation, which may cause instability in the physicochemical properties and interfacial chemistry at the particle surface as it undergoes structural relaxation. During the thermodynamically driven relaxation process, differing drug properties may lead to DPI formulations with unpredictable formulation structure and product functionality. A fundamental understanding of the structural relaxation dynamics is therefore essential in the development and commercialisation of a quality-by-design led inhalation product. This thesis investigated the structural relaxation dynamics of micronised fluticasone propionate (FP), salmeterol xinafoate (SX) and glycopyrrolate bromide (GLY). Physicochemical properties and surface interfacial chemistry, via cohesive-adhesive balance (CAB) measurements, of micronised drug are assessed as a function of environmental stressed laagering over well-defined periods of time and in situ conditioning in hydrofluoroalkane (HFA). The influence of these dynamics upon DPI performance was also examined in both binary (FP, SX, GLY) and tertiary formulations (FP-SX). The results indicated how structural relaxation of hydrophobic and hydrophilic APIs trigger off different stress relaxation pathways with different sensitivities to laagering conditions. These data suggested that the introduction of a post-micronisation conditioning step may expedite structural relaxation of hydrophobic APIs. Whilst the physical properties of hydrophobic APIs are largely unaffected by mechanical activation, surface interfacial chemistry governing inter-particulate forces between API and the lactose carrier is directly affected by environmental conditions of temperature and relative humidity during structural relaxation. The study also showed the potential use of post-micronisation conditioning to tailor the surface chemistry properties of APIs. For hydrophilic APIs, data suggested that post-micronisation conditioning is essential in enabling physical and chemical stability of inhaled formulations. Furthermore, in vitro aerosolisation studies suggested that the aerodynamic particle size distribution and fine particle mass were directly affected by post-micronisation laagering conditions. The importance of generating a well defined, understood and controlled design space throughout product development dictates the need for more robust API processing prior to DPI formulation. This work highlights how a tailored post-micronisation laagering strategy can have a significant effect on physicochemical and interfacial properties as well as product performance of binary and tertiary carrier based DPI formulations.
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Woolman, Joseph N. "Dense nanometric microalloyed MoSi₂ synthesized through mechanical and field activation /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Li, Jiajie. "Mechanical activation of ultramafic mine waste materials for enhanced mineral carbonation." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61039.

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The potential success of integrating mineral carbonation, as a pathway to CO₂ sequestration, in mining projects, is dependent on the mineralogical composition and characteristics of its waste rock and tailings. Ultramafic rocks have proven the best potential substrate for mineral carbonation and their ability to alter and to convert CO₂ into its carbonate mineral form is dependent on the original mineralogy and particle surface area. CO₂ conversion kinetics is complex and with the application of appropriate comminution technologies, its efficiency can be enhanced. The objective of this research is to evaluate mechanical activation to enhance the carbonation storage capacity of mine waste material. Three approaches were taken in this research. The first approach was to characterize the microstructure of the mechanically-activated mineral olivine, a predominant mineral constituent of ultramafic rocks, using X-ray diffraction patterns and line profile analysis methods with full pattern fitting method. The second approach was to compare the structural and chemical changes of mine waste with pure olivine, both of which were activated by various mechanical forces under both wet or dry conditions and subsequently carbonated in a direct aqueous carbonation process. Regardless of milling conditions, forsterite (Mg₂SiO₄), the olivine mineral variety in the mine waste, was found to be the main mineral being mechanically-activated and carbonated. It was determined that lizardite (Mg₃(Si₂O₅)(OH)₄), a hydrated magnesium silicate also common in ultramafic hosted mineral deposits, acted as catalyzer assisting forsterite reaching high levels of activation. This condition generated a greater CO₂ conversion to carbonate than that of pure olivine with the equal specific milling energy input. The stirred mill proved to be the most efficient form of mechanical activation vis-a-vis the direct aqueous carbonation process, followed by the planetary mill and the vibratory mill. The third approach analyzes the feasibility of mechanical activation in an integrated mineral carbonation process in a nickel mine considering the life cycle of the process. The minimum operating cost for 60% CO₂ sequestration efficiency was 105-107 $/t CO₂ avoided. At this point, the Turnagain project can potentially sequester 238 Mt/y CO₂ using its waste during the 28-year life of mine.
Applied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
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Colin-York, Huw. "Investigating the active role of mechanical force during T-cell activation." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:0b35bf22-f37f-4286-872d-ea174be82c77.

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The role of mechanical force has gained increasing interest in the field of cell biology owing to the realisation that cells are continually subject to stresses and strains induced by the cellular environment. Cells are known to be able to sense and react to forces imposed on them by their local environment as well as being able to directly impart force during motility, adhesion and cell division. This is also true for cells of the adaptive immune system, specifically during the intimate cell-cell interaction occurring between the T-cell and Antigen Presenting Cell (APC), known as the Immunological Synapse (IS). This highly selective process by which a T cell is able to bind, recognise and react to only foreign antigens has been the focus of intense study due to its crucial importance in the adaptive immune response. The actin cytoskeleton is known to play an essential role in the formation and maintenance of the IS, but questions remain regarding the influence of forces generated by actin during this process. With the aim of measuring mechanical force generated at the IS, we present a novel method combining the super resolution imaging technique, Stimulated Emission Depletion (STED) microscopy and Traction Force Microscopy (TFM). Using the tunable kinetics of the 1G4 Jurkat T-cell system in combination with high spatial and temporal resolution microscopy we demonstrate that actin dynamics at the IS is antigen dependent and show by TFM that force generation occurs on two distinct time scales during activation, mediated by the actin cytoskeleton. Together, the results highlight the intimate links between the dynamics of the actin cytoskeleton, force generation and the antigen response of T cells during activation.
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Tole, Ilda. "Mechanical activation of clay : a novel route to sustainable cementitious binders." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76362.

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EU Sustainable Development Strategy planned to achieve improvement of life-quality by promoting sustainable production and consumption of raw materials. On November 2018, EU Commission presented a long-term strategy, aiming among others a climate-neutral economy by 2050. Cement production is contributing to 6-10% of the anthropogenic CO2 emissions. Thus, several strategies for total or partial replacement of Portland cement in concrete production have been developed. The use of supplementary cementitious materials (SCM) and alkali-activated materials (AAM) is considered the most efficient countermeasure to diminish CO2 emissions. The broadening of knowledge with particular attention to the sustainable goals is the primary requirement to be fulfilled when novel materials are investigated. This study aims to develop a novel clay-based binder that can be used as a sustainable alternative to produce SCM as well as AAM. Clay is a commonly occurring material, with large deposits worldwide. However, natural clay has a low reactivity and various compositions, depending, e.g. on the weathering conditions. The present research aims exactly at enhancing the reactivity of natural clays occurring in Sweden subjecting them to mechanical activation in a planetary ball mill. Ball milling (BM) is considered a clean technology able to enhance the reactivity of crystalline materials without resorting to high processing temperatures or additional chemicals. BM was able to induce amorphization in clay minerals and to transform the layered platy morphology to spherical shape particles. The efficiency of the process was strictly related to the used process parameters. Higher ball to processed powder (B/P) ratio, longer time of grinding and higher grinding speeds increased the degree of the obtained amorphization. However, an undesired extensive caking and agglomeration occurred in certain setups. The potential of activated clay as a SCM was investigated in specific case studies. The measured compressive strength results showed a direct correlation between the enhanced amorphization degree of the mechanically activated clay and the increased strength values. The pozzolanic activity was induced and enhanced after the mechanical activation of the clay. The reactivity was assessed by the strength activity index (SAI). Furthermore, preliminary tests have shown that the alkali activation of the processed clays produced solidified matrixes with considerable strength.
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Zhu, Ting 1971. "Atomistic characterization of stress-driven configurational instability and its activation mechanisms." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17954.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (p. 145-156).
Cleavage decohesion and shear dislocation nucleation are two basic modes of localized deformation in crystal lattices, which normally result from instability of the atomic configuration driven by mechanical forces. The critical state of instability and its thermal activation mechanisms can be quantitatively determined by analyzing the energetics of the lattice system. In this thesis, the unit processes of configurational instability of crystal lattices under various non-uniform structural and/or chemical environments are characterized by systematically probing the atomistic potential energy landscape of each system using the state of the art configurational space sampling schemes. The problems studied are homogeneous dislocation nucleation in a perfect crystal by nanoindentation, dislocation emission and cleavage decohesion at atomically sharp crack tips, and chemically-enhanced bond breaking in a wet silica nanorod. These processes are studied in a unified manner such that two important types of properties are determined: one is the athermal load at which the instability takes place instantaneously without the aid of thermal fluctuations, and the other is the stress-dependent activation energy used for an estimate of the kinetic rate of transition. Along the way, important aspects concerning the atomistic characterization of configurational instability are revealed. Of particular note is extending the continuum instability criterion to detect atomic defect nucleation. We demonstrate that a local instability criterion can be applied to identify dislocation nucleation in the case of indentation, considering that the relatively small strain gradient beneath the indenter will lead to a mode of long wavelength phonon instability suitable for a study
(cont.) by the local continuum approach. In addition, the chemical effect on stress-driven lattice instability is revealed via the study on reactivity of a silica nanorod with water. We identify distinct competing mechanisms of hydrolysis which are rate-controlling at different load regimes. The ensuing stress-mediated switch of rate-limiting steps of hydrolysis quantitatively demonstrates the impact of finding the detailed molecular mechanisms on a realistic estimate of the activation rate when configurational instability occurs within a chemically reactive environment. Implications regarding the analysis of chemically-assisted brittle fracture are also discussed.
by Ting Zhu.
Ph.D.
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Books on the topic "Mechanical activation"

1

Mechanical activation of minerals. Amsterdam: Elsevier, 1989.

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Ristić, Momčilo M. Mechanical activation of inorganic materials. Edited by Milošević Siniša Dj and Miljanić Petar. Belgrade: Serbian Academy of Science and Arts, 1998.

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Ristić, Momčilo M. Mechanical activation of inorganic materials. Edited by Milošević Siniša Dj and Miljanić Petar. Belgrade: Serbian Academy of Science and Arts, 1998.

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Mechanical activation of minerals by grinding: Pulverizing and morphology of particles. Chichester: Ellis Horwood, 1990.

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Dr, Juhász Z. Mechanical activation of minerals by grinding: Pulverizing and morphology of particles. Budapest: Akadémiai Kiadó, 1990.

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Sudhir, Gupta, Paul William E, and Fauci Anthony S. 1940-, eds. Mechanisms of lymphocyte activation and immune regulation. New York: Plenum Press, 1987.

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Sudhir, Gupta, Paul William E, and Fauci Anthony S, eds. Mechanisms of lymphocyte activation and immune regulation. New York: Plenum Press, 1987.

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International Conference on Mechanochemistry and Mechanical Activation (2nd 1997 Novosibirsk, Russia). INCOME-2, 2-nd International Conference on Mechanochemistry and Mechanical Activation: Novosibirsk, Russia, 12-16 August, 1997 : program and abstracts. [Novosibirsk?]: Institute of Solid State Chemistry, Siberian Branch, Russian Academy of Sciences, 1997.

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Boldyrev, V. V. Mechanochemistry and Mechanical Activation of Solids. Imperial College Press, 2006.

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Juhasz, Z. Mechanical activation of minerals by grinding: Pulverizing and morphology of particles. Akademiai Kiado, 1990.

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Book chapters on the topic "Mechanical activation"

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Živanović, Deana, Ljubiša Andrić, Živko Sekulić, and Siniša Milošević. "Mechanical Activation of Mica." In Advanced Science and Technology of Sintering, 211–17. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4419-8666-5_29.

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Bošković, S., Ð. Kosanović, Ð. Bahloul-Hourlier, P. Thomas, and Š. Kiš. "Mechanical Activation of BaCO3-Al2O3-SiO2." In Advanced Science and Technology of Sintering, 167–73. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4419-8666-5_22.

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Liu, C. D., Y. F. Han, and M. G. Yan. "A Creep Constitutive Model of Dislocation Thermal Activation." In Mechanical Behavior of Materials, 181–87. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1968-6_20.

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Faucher, Bernard, and W. R. Tyson. "Thermal Activation and Brittle Failure of Structural Steels." In Mechanical Behavior of Materials, 223–28. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1968-6_25.

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Abdel-Rehim, Aly M., and Mohamed Y. Bakr. "Mechanical Activation of Processing of Egyptian Wolframite." In Rare Metal Technology 2015, 193–208. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093244.ch22.

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Dossi, Stefano, Christian Paravan, Filippo Maggi, and Luciano Galfetti. "Enhancing Micrometric Aluminum Reactivity by Mechanical Activation." In Innovative Energetic Materials: Properties, Combustion Performance and Application, 17–44. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4831-4_2.

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Abdel-Rehim, Aly M., and Mohamed Y. Bakr. "Mechanical Activation of Processing of Egyptian Wolframite." In Rare Metal Technology 2015, 193–208. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48188-3_22.

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Chinelatto, Adriana S. A., C. Lago, S. R. M. Antunes, A. C. Antunes, O. M. Cintho, and A. L. Chinelatto. "Synthesis of Alumina Powders by Mechanical Activation." In Materials Science Forum, 655–60. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.655.

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Andrić, Ljubiša, Anja Terzić, Snežana Pašalić, Milan Petrov, and Dragan Radulović. "The Effects of the Phosphates’ Mechanical Activation." In Proceedings of the III Advanced Ceramics and Applications Conference, 339–51. Paris: Atlantis Press, 2015. http://dx.doi.org/10.2991/978-94-6239-157-4_23.

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Bernard, Frédéric, Sébastien Paris, and Eric Gaffet. "Mechanical Activation as a New Method for SHS." In Advances in Science and Technology, 979–88. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.979.

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Conference papers on the topic "Mechanical activation"

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Chien, Shu. "Role of Mechanical Forces in Endothelial Homeostasis." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-193197.

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Shear stress and stretch can modulate functions of vascular endothelial cells (ECs) by activating mechano-sensors, signaling pathways, and gene/protein expressions. Sustained shear stress with a forward direction causes only a transient activation of atherogenic genes, followed by down-regulation. In ECs exposed to complex flow with little forward direction, activation of these atherogenic genes is sustained, and cell turnover is accelerated. Cyclic uniaxial stretch causes orientation of actin stress fibers perpendicular to stretch direction, and this causes a decrease of intracellular stress, transient JNK activation, and protection of ECs against apoptosis. Cyclic biaxial stretch without a preferred direction has opposite effects. In the straight arteries, laminar shear stress with a forward direction and uniaxial strain with a circumferential direction have anti-atherogenic effects. At branch points, the complex shear flow and mechanical strain with little net direction are atherogenic. The direction of mechanical forces has important effects on ECs in health and disease.
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Dossi, Stefano, Christian Paravan, Filippo Maggi, and Luciano Galfetti. "Enhancing Micrometric Aluminum Reactivity by Mechanical Activation." In 51st AIAA/SAE/ASEE Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-4221.

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Marcin, Michal. "MECHANICAL ACTIVATION OF SLAG AND ITS INFLUENCE ON MECHANICAL PROPERTIES OF GEOPOLYMERS." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/11/s04.113.

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Hamada and Takeda. "Hot-Electron Trapping Activation Energy Under Mechanical Stress." In Symposium 1993 on VLSI Technology. IEEE, 1993. http://dx.doi.org/10.1109/vlsit.1993.760222.

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Shaw, L., S. J. Chiang, M. Luo, Z. Wang, M. Burrill, and A. Ortiz. "Improving Battery Performance via Mechanical Activation Enhanced Synthesis." In The 7th World Congress on New Technologies. Avestia Publishing, 2021. http://dx.doi.org/10.11159/icert21.001.

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Skripkina, T., O. Naymushina, V. Tikhova, E. Podgorbunskikh, and E. Zubakova. "Mechanical and mechanochemical activation of West Siberian peat." In Fifth International Conference of CIS IHSS on Humic Innovative Technologies «Humic substances and living systems». CLUB PRINT ltd., 2019. http://dx.doi.org/10.36291/hit.2019.skripkina.127.

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Bluestein, Danny, Jolyon Jesty, Adam E. Saltman, Irvin B. Krukenkamp, and Krishnamurthy Suresh. "Platelet Activation in Flow Past Mechanical Heart Valves." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/bed-23110.

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Abstract Numerical studies, in vitro, and in vivo measurements were conducted, aimed at quantifying free emboli formation and procoagulant properties of platelets induced by flow past mechanical heart valves (MHV). Pulsatile turbulent flow simulation was conducted past a St. Jude medical MHV in the aortic position, to study the effects of valve implantation technique on the thromboembolic potential of the valve. A misaligned valve with subannualarly sutured pledgets produced accelerating jet flow through the valve orifices and a wider wake of shed vortices. Shear stress histories of platelets along turbulent trajectories exposed the platelets to elevated shear stresses around the leaflets, leading them to entrapment within the shed vortices. In vitro platelet studies were conducted past the MHV mounted in a recirculation flow loop, by measuring the platelets ability to support the activation of acetylated human prothrombin by factor xa, which enables sequestering flow induced effects and quantification of the platelets activity state. The platelet activation state increased monotonically as a function of the recirculation time past the valve, as measured by the thrombin generation rates in the assay. Finally, platelet activity state measurements were conducted in vivo, from a sheep with an implanted MHV, showing marked increase of platelet activation after valve implantation.
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Barnett, Ralph L., and Peter Barroso. "Foot Control Activation: Reciprocating vs. Pivoting." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0338.

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Abstract Discriminating between the two most widely used foot control concepts, open-sided and side-shielded, requires, among other things, an understanding of reciprocating and pivoting foot motions. In single cycle machine operations, it was found that the hands are steadier when foot controls are activated by pivoting about the heel as opposed to reciprocating. Furthermore, the study reveals the counterintuitive result that the reciprocating motion delivers slightly more activations per unit time than the pivoting action. If safety is not a consideration, stroke rate, operator comfort and hand steadiness are maximized when foot controls are actuated by “riding the pedal” or “hold down/release.”
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Kutch, Jason J., and Francisco J. Valero-Cuevas. "Complete Solution Sets for Neuromuscular Models Reveal How Mechanical Constraints Limit Neural Control Options." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19430.

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One of the main goals of neuromuscular modeling is to establish the range of feasible muscle activations for a given mechanical output of the body. This is not a trivial problem because there are typically infinitely many combinations of muscle activations that will generate the same joint torques, as most joints are actuated by more muscles than rotational degrees of freedom. Here we show that well-established geometric methods easily provide a complete description of the set of muscle activations that generate a desired set of joint torques or endpoint forces. In contrast to iterative linear programming optimizations, geometric methods provide a set of solutions in muscle activation space simply by converting between the geometric representations of neural and mechanical constraints. As an example, we use geometric methods to find the feasible set of activations that produce fingertip forces in a set of directions. These results show that for a given set of fingertip forces, the range of feasible activation for each muscle can differ with the choice of mechanical constraints. Thus, the mechanical constraints of the task play an important role governing the options the nervous system has when controlling redundant muscles.
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Popov, Valentin L., and Ken Nakano. "CONTACT MECHANICS OF CLUSTERS OF HEART CELLS: MECHANICAL ACTIVATION AND SYNCHRONIZATION OF MYOCYTES." In Physical Mesomechanics of Materials. Physical Principles of Multi-Layer Structure Forming and Mechanisms of Non-Linear Behavior. Novosibirsk State University, 2022. http://dx.doi.org/10.25205/978-5-4437-1353-3-322.

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Reports on the topic "Mechanical activation"

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Stoyanova, Daniela D., and Irina D. Stambolova. Effect of Mechanical Activation of CaTiO3 Powder on Some Physicochemical Properties. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, December 2018. http://dx.doi.org/10.7546/crabs.2018.12.05.

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Zinkle, S. J., J. P. Robertson, and R. L. Klueh. Thermophysical and mechanical properties of Fe-(8-9)%Cr reduced activation steels. Office of Scientific and Technical Information (OSTI), September 1998. http://dx.doi.org/10.2172/330622.

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Shaw, Leon, L., Gary, Z. Yang, Kyle Crosby, Xufei Zhong, Yang Wwan, Tippawan Markmaitree, William Osborn, Jianzhi Hu, and Ja Hun Kwak. Effects and Mechanisms of Mechanical Activation on Hydrogen Sorption/ Desorption of Nanoscale Lithium Nitrides. Office of Scientific and Technical Information (OSTI), April 2012. http://dx.doi.org/10.2172/1039049.

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M.J. McKelvy, J. Diefenbacher, R. Nunez, R.W. Carpenter, and A.V.G. Chizmeshya. SIMULTANEOUS MECHANICAL AND HEAT ACTIVATION: A NEW ROUTE TO ENHANCE SERPENTINE CARBONATION REACTIVITY AND LOWER CO2 MINERAL SEQUESTRATION PROCESS COST. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/840464.

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Sessa, Guido, and Gregory Martin. Role of GRAS Transcription Factors in Tomato Disease Resistance and Basal Defense. United States Department of Agriculture, 2005. http://dx.doi.org/10.32747/2005.7696520.bard.

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The research problem: Bacterial spot and bacterial speck diseases of tomato are causedby strains of Xanthomonas campestris pv. vesicatoria (Xcv) and Pseudomonas syringae pv.tomato (Pst), respectively. These bacteria colonize aerial parts of the plant and causesignificant losses in tomato production worldwide. Protection against Xcv and Pst bycultural practices or chemical control has been unsuccessful and there are only limitedsources of genetic resistance to these pathogens. In previous research supported in part byBARD IS-3237-01, we extensively characterized changes in tomato gene expression uponthe onset of spot and speck disease resistance. A remarkable finding of these studies wasthe inducibility in tomato leaves by both Xcv and Pst strains of genes encodingtranscriptional activator of the GRAS family, which has not been previously linked todisease resistance. Goals: Central goals of this research were to investigate the role of GRAS genes in tomatoinnate immunity and to assess their potential use for disease control.Specific objectives were to: 1. Identify GRAS genes that are induced in tomato during thedefense response and analyze their role in disease resistance by loss-of-function experiments.2. Overexpress GRAS genes in tomato and characterize plants for possible broad-spectrumresistance. 3. Identify genes whose transcription is regulated by GRAS family. Our main achievements during this research program are in three major areas:1. Identification of tomato GRAS family members induced in defense responses andanalysis of their role in disease resistance. Genes encoding tomato GRAS family memberswere retrieved from databases and analyzed for their inducibility by Pst avirulent bacteria.Real-time RT-PCR analysis revealed that six SlGRAS transcripts are induced during theonset of disease resistance to Pst. Further expression analysis of two selected GRAS genesshowed that they accumulate in tomato plants in response to different avirulent bacteria orto the fungal elicitor EIX. In addition, eight SlGRAS genes, including the Pst-induciblefamily members, were induced by mechanical stress in part in a jasmonic acid-dependentmanner. Remarkably, SlGRAS6 gene was found to be required for tomato resistance to Pstin virus-induced gene silencing (VIGS) experiments.2. Molecular analysis of pathogen-induced GRAS transcriptional activators. In aheterologous yeast system, Pst-inducible GRAS genes were shown to have the ability toactivate transcription in agreement with their putative function of transcription factors. Inaddition, deletion analysis demonstrated that short sequences at the amino-terminus ofSlGRAS2, SlGRAS4 and SlGRAS6 are sufficient for transcriptional activation. Finally,defense-related SlGRAS proteins were found to localize to the cell nucleus. 3. Disease resistance and expression profiles of transgenic plants overexpressing SlGRASgenes. Transgenic plants overexpressing SlGRAS3 or SlGRAS6 were generated. Diseasesusceptibility tests revealed that these plants are not more resistant to Pst than wild-typeplants. Gene expression profiles of the overexpressing plants identified putative direct orindirect target genes regulated by SlGRAS3 and SlGRAS6. Scientific and agricultural significance: Our research activities established a novel linkbetween the GRAS family of transcription factors, plant disease resistance and mechanicalstress response. SlGRAS6 was found to be required for disease resistance to Pstsuggesting that this and possibly other GRAS family members are involved in thetranscriptional reprogramming that takes place during the onset of disease resistance.Their nuclear localization and transcriptional activation ability support their proposed roleas transcription factors or co-activators. However, the potential of utilizing GRAS familymembers for the improvement of plant disease resistance in agriculture has yet to bedemonstrated.
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