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Articles de revues sur le sujet « Material dynamics »

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Auteur : Grafiati

Publié le 10 mars 2023

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1

Lurie, K. A. « MATERIAL OPTIMIZATION AND DYNAMIC MATERIALS ». Cybernetics and Physics, Volume 10, 2021, Number 2 (1 octobre 2021) : 84–87. http://dx.doi.org/10.35470/2226-4116-2021-10-2-84-87.

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The paper is about the connection between material optimization in dynamics and a novel concept of dynamic materials (DM) defined as inseparable union of a framework and the fluxes of mass, momentum, and energy existing in time dependent material formations. An example of a spatial-temporal material geometry is discussed as illustration of a DM capable of accumulating wave energy. Finding the optimal material layouts in dynamics demonstrates conceptual difference from a similar procedure in statics. In the first case, the original constituents are distributed in space-time, whereas in the second - in space alone. The habitual understanding of a material as an isolated framework has come from statics, but a transition to dynamics brings in a new component - the fluxes of mass, momentum, and energy. Based on Noether theorem, these fluxes connect the framework with the environment into inseparable entity termed dynamic material (DM). The key role of DM is that they support controls that may purposefully change the material properties in both space and time, which is the main goal of optimization.

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Morgan, David. « Religion : Material Dynamics ». Journal of Contemporary Religion 34, n^o 3 (2 septembre 2019) : 571–72. http://dx.doi.org/10.1080/13537903.2019.1661610.

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Olsson, Hans. « Religion : Material Dynamics ». Religion 50, n^o 2 (26 novembre 2019) : 316–19. http://dx.doi.org/10.1080/0048721x.2019.1695175.

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Fortak, Heinz. « Material derivatives of higher dimension in geophysical fluid dynamics ». Meteorologische Zeitschrift 13, n^o 6 (23 décembre 2004) : 499–510. http://dx.doi.org/10.1127/0941-2948/2004/0013-0499.

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Ikeshoji, Tamio. « Classical Molecular Dynamics Simulation for Material Design. » Materia Japan 35, n^o 6 (1996) : 688–94. http://dx.doi.org/10.2320/materia.35.688.

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Steeneken, Peter G., Robin J. Dolleman, Dejan Davidovikj, Farbod Alijani et Herre S. J. van der Zant. « Dynamics of 2D material membranes ». 2D Materials 8, n^o 4 (12 août 2021) : 042001. http://dx.doi.org/10.1088/2053-1583/ac152c.

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Woodruff, Jeffrey B., Oliver Wueseke et Anthony A. Hyman. « Pericentriolar material structure and dynamics ». Philosophical Transactions of the Royal Society B : Biological Sciences 369, n^o 1650 (5 septembre 2014) : 20130459. http://dx.doi.org/10.1098/rstb.2013.0459.

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A centrosome consists of two barrel-shaped centrioles embedded in a matrix of proteins known as the pericentriolar material (PCM). The PCM serves as a platform for protein complexes that regulate organelle trafficking, protein degradation and spindle assembly. Perhaps most important for cell division, the PCM concentrates tubulin and serves as the primary organizing centre for microtubules in metazoan somatic cells. Thus, similar to other well-described organelles, such as the nucleus and mitochondria, the cell has compartmentalized a multitude of vital biochemical reactions in the PCM. However, unlike these other organelles, the PCM is not membrane bound, but rather a dynamic collection of protein complexes and nucleic acids that constitute the organelle's interior and determine its boundary. How is the complex biochemical machinery necessary for the myriad centrosome functions concentrated and maintained in the PCM? Recent advances in proteomics and RNAi screening have unveiled most of the key PCM components and hinted at their molecular interactions ( table 1 ). Now we must understand how the interactions between these molecules contribute to the mesoscale organization and the assembly of the centrosome. Among outstanding questions are the intrinsic mechanisms that determine PCM shape and size, and how it functions as a biochemical reaction hub.

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BANG, Junhyeok. « Excited Carrier Dynamics in Two-dimensional Materials ». Physics and High Technology 29, n^o 9 (30 septembre 2020) : 15–21. http://dx.doi.org/10.3938/phit.29.032.

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When electrons in materials are excited, they undergo several dynamic processes such as carrier thermalization, transfer, and recombination. These fundamental excited state processes are crucial to understanding the microscopic principles at work in electronic and optoelectronic devices. This article introduces the excited carrier dynamics in a two-dimensional van der Waals material and reveals several interesting phenomena that do not occur in bulk materials. Particularly, the focus will be two dynamic processes: carrier multiplication and ultrafast charge transfer.

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Keya, Kamrun N., Mohammed A. Jabed, Wenjie Xia et Dmitri Kilin. « Photoluminescence of Cis-Polyacetylene Semiconductor Material ». Applied Sciences 12, n^o 6 (9 mars 2022) : 2830. http://dx.doi.org/10.3390/app12062830.

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Photoluminescence (PL) is one of the key experimental characterizations of optoelectronic materials, including conjugated polymers (CPs). In this study, a simplified model of an undoped cis-polyacetylene (cis-PA) oligomer was selected and used to explain the mechanism of photoluminescence (PL) of the CPs. Using a combination of the ab initio electronic structure and a time-dependent density matrix methodology, the photo-induced time-dependent excited state dynamics were computed. We explored the phonon-induced relaxation of the photoexcited state for a single oligomer of cis-PA. Here, the dissipative Redfield equation of the motion was used to compute the dissipative excited state dynamics of electronic degrees of freedom. This equation used the nonadiabatic couplings as parameters. The computed excited state dynamics showed that the relaxation rate of the electron is faster than the relaxation rate of the hole. The dissipative excited-state dynamics were combined with radiative recombination channels to predict the PL spectrum. The simulated results showed that the absorption and emission spectra both have a similar transition. The main result is that the computed PL spectrum demonstrates two mechanisms of light emission originating from (i) the inter-band transitions, corresponding to the same range of transition energies as the absorption spectrum and (ii) intra-band transitions not available in the absorption spectra. However, the dissipative Redfield equation of the motion was used to compute the electronic degrees of freedom of the nonadiabatic couplings, which helped to process the time propagation of the excited dynamic state. This excited dynamic state shows that the relaxation rate of the electron is faster than the relaxation rate of the hole, which can be used for improving organic semiconductor materials for photovoltaic and LED applications.

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Kishimoto, Satoshi, et Norio Shinya. « Fabrication of Metallic Closed Cellular Materials for Multi-functional Materials(International Workshop on Smart Materials and Structural Systems, W03 Jointly organized by Material & ; Processing Division, Material & ; Mechanics Division, Dynamics & ; Control Division and Space Engineering Division.) ». Reference Collection of Annual Meeting 2004.8 (2004) : 314–15. http://dx.doi.org/10.1299/jsmemecjsm.2004.8.0_314.

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Andrews, Ross N., Suresh Narayanan, Fan Zhang, Ivan Kuzmenko et Jan Ilavsky. « CONTIN XPCS : software for inverse transform analysis of X-ray photon correlation spectroscopy dynamics ». Journal of Applied Crystallography 51, n^o 1 (1 février 2018) : 205–9. http://dx.doi.org/10.1107/s1600576717017113.

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X-ray photon correlation spectroscopy (XPCS) and dynamic light scattering (DLS) reveal materials dynamics using coherent scattering, with XPCS permitting the investigation of dynamics in a more diverse array of materials than DLS. Heterogeneous dynamics occur in many material systems. The authors' recent work has shown how classic tools employed in the DLS analysis of heterogeneous dynamics can be extended to XPCS, revealing additional information that conventional Kohlrausch exponential fitting obscures. The present work describes the software implementation of inverse transform analysis of XPCS data. This software, calledCONTIN XPCS, is an extension of traditionalCONTINanalysis and accommodates the various dynamics encountered in equilibrium XPCS measurements.

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Nishi, Yosihtake. « 2004 Research for Intelligent Materials & ; System(International Workshop on Smart Materials and Structural Systems, W03 Jointly organized by Material & ; Processing Division, Material & ; Mechanics Division, Dynamics & ; Control Division and Space Engineering Division.) ». Reference Collection of Annual Meeting 2004.8 (2004) : 312–13. http://dx.doi.org/10.1299/jsmemecjsm.2004.8.0_312.

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Wotton, R. S. « Dissolved Organic Material and Trophic Dynamics ». BioScience 38, n^o 3 (mars 1988) : 172–78. http://dx.doi.org/10.2307/1310450.

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Lang, Theodore E., Tsutomu Nakamura, Jimmle D. Dent et Mario Martinelli. « Avalanche Flow Dynamics with Material Locking ». Annals of Glaciology 6 (1985) : 5–8. http://dx.doi.org/10.3189/1985aog6-1-5-8.

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Reported are results of incorporating recent snow avalanche processes into hydrodynamic uniform flow equations, used to model motion of snow avalanches. Actual modifications include the relating of dissipative coefficients of the flow model to slab release depth, the representation of the material as a locking fluid, and the mini-segmentation of the avalanche path at low flow speeds in order to numerically accomodate viscous transition and avalanche cessation of motion. The purpose in looking at different formulations of the uniform flow hydrodynamic flow equations is to reduce the variation in the drag coefficients when the theory is applied to different avalanche paths, as compared to what has been previous experience. The model that reduced parameter variation the most was one in which the total drag force decreased in an intermediate velocity range, a mechanism that has had recent experimental verification.

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Guillard, François, Pouya Golshan, Luming Shen, Julio R. Valdès et Itai Einav. « Compaction dynamics of crunchy granular material ». EPJ Web of Conferences 140 (2017) : 07012. http://dx.doi.org/10.1051/epjconf/201714007012.

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Lang, Theodore E., Tsutomu Nakamura, Jimmle D. Dent et Mario Martinelli. « Avalanche Flow Dynamics with Material Locking ». Annals of Glaciology 6 (1985) : 5–8. http://dx.doi.org/10.1017/s0260305500009885.

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Reported are results of incorporating recent snow avalanche processes into hydrodynamic uniform flow equations, used to model motion of snow avalanches. Actual modifications include the relating of dissipative coefficients of the flow model to slab release depth, the representation of the material as a locking fluid, and the mini-segmentation of the avalanche path at low flow speeds in order to numerically accomodate viscous transition and avalanche cessation of motion. The purpose in looking at different formulations of the uniform flow hydrodynamic flow equations is to reduce the variation in the drag coefficients when the theory is applied to different avalanche paths, as compared to what has been previous experience. The model that reduced parameter variation the most was one in which the total drag force decreased in an intermediate velocity range, a mechanism that has had recent experimental verification.

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Krawczuk, M., W. Ostachowicz et A. Zak. « Dynamics of cracked composite material structures ». Computational Mechanics 20, n^o 1-2 (juillet 1997) : 79–83. http://dx.doi.org/10.1007/s004660050220.

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Lurie, Konstantin A. « On Material Optimization in Continuum Dynamics ». Journal of Optimization Theory and Applications 167, n^o 1 (18 novembre 2014) : 147–60. http://dx.doi.org/10.1007/s10957-014-0678-4.

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Fauza, Naila, Dina Syaflita, Ernidawati, Diah Anugrah Dipuja, M. Yogi Ryantama Isjoni, Neni Hermita et Fanny Rahmatina Rahim. « Analyze Instructional Materials for Physics Modul Integrated Natural Disasters and Mitigation ». Journal of Physics : Conference Series 2049, n^o 1 (1 octobre 2021) : 012030. http://dx.doi.org/10.1088/1742-6596/2049/1/012030.

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Abstract Today natural disasters are a global issue. Several countries have made strategies in natural disaster mitigation. Natural disasters of land forest fires, smog, floods, and landslides are common disasters in Riau province. Environment and natural disaster phenomena are closely related to physics. Integrated Physics materials of natural disasters can be applied in secondary schools. The teaching materials in general consist of knowledge, skills, and attitudes that students must learn to achieve a standard competence. The purpose of the research is analyze the physics instructional material of natural disasters to build physics modules integrated with natural disasters and mitigation in secondary schools. The method used ADDIE model (Analyza, Design, Development, Implementation and Evaluation). This research in analyze. The define (analyze) stage is done through field study and literature study to collect the kinds of material hat occur in the concept. The scope of the study analyzed the material physics curriculum 2013 high school integrated natural disasters namely particle dynamics, rotation dynamics and equilibrium rigid body, static fluids, dynamic fluids, heat and displacement. This research was conducted at SMAN 15 Pekanbaru City. The school used a revised 2013 curriculum. This research includes qualitative approach research and descriptive research type. The physics that can be integrated are the rotational dynamics and equilibrium of rigid objects, the weight points of objects, static and dynamic fluids and heat and displacement. The material is integrated into the material of natural disasters that often occur in Riau province, namely landslides, forest fires, smog and floods.

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Tang, Ye, et Tianzhi Yang. « Bi-Directional Functionally Graded Nanotubes : Fluid Conveying Dynamics ». International Journal of Applied Mechanics 10, n^o 04 (mai 2018) : 1850041. http://dx.doi.org/10.1142/s1758825118500412.

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In the paper, a novel model of fluid-conveying nanotubes made of bi-directional functionally graded materials is presented for investigating the dynamic behaviors and stability. For the first time, the material properties of the nanotubes along both radical and axial directions are under consideration. Based on Euler–Bernoulli beam and Eringen’s nonlocal elasticity theories, the governing equation of the nanotubes and associated boundary conditions are developed using Hamilton’s principle. Differential quadrature method (DQM) is applied for discretizing the equation to determine the numerical solutions of the nanotubes with different boundary conditions. Numerical examples are presented to examine the effects of the material gradation, nonlocal parameter, and mode order on the dynamics and stability. It is shown that the two-directional materials distribution can significantly change the critical flow velocity, fundamental frequencies and stability. Comparing with traditional one-directional distribution, such 2D is more flexible to tune overall dynamic behaviors, this may provide new avenues for smart pipes.

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Cailleau, Hervé, Maciej Lorenc, Laurent Guérin, Marina Servol, Eric Collet et Marylise Buron-Le Cointe. « Structural dynamics of photoinduced molecular switching in the solid state ». Acta Crystallographica Section A Foundations of Crystallography 66, n^o 2 (18 février 2010) : 189–97. http://dx.doi.org/10.1107/s0108767309051046.

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Fast and ultra-fast time-resolved diffraction is a fantastic tool for directly observing the structural dynamics of a material rearrangement during the transformation induced by an ultra-short laser pulse. The paper illustrates this ability using the dynamics of photoinduced molecular switching in the solid state probed by 100 ps X-ray diffraction. This structural information is crucial for establishing the physical foundations of how to direct macroscopic photoswitching in materials. A key feature is that dynamics follow a complex pathway from molecular to material scales through a sequence of processes. Not only is the pathway indirect, the nature of the dynamical processes along the pathway depends on the timescale. This dictates which types of degrees of freedom are involved in the subsequent dynamics or kinetics and which are frozen or statistically averaged. We present a recent investigation of the structural dynamics in multifunctional spin-crossover materials, which are prototypes of molecular bistability in the solid state. The time-resolved X-ray diffraction results show that the dynamics span from subpicosecond molecular photoswitching followed by volume expansion (on a nanosecond timescale) and additional thermoswitching (on a microsecond timescale).

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Atamanyuk, Volodymyr, et Yaroslav Gumnytskyi. « Mass Exchange Dynamics During the Second Filtration Drying Period ». Chemistry & ; Chemical Technology 3, n^o 2 (15 juin 2009) : 129–37. http://dx.doi.org/10.23939/chcht03.02.129.

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The work is dedicated to theoretical and experimental investigations of kinetics and dynamics of filtration drying of capillary and pore materials, and mineral granulated fertilizers, in particular. The proposed physical model of a moist particle and the differential system of equations which describes heat exchange in the second drying period enables to determine the transfer velocity of mass-exchange zone in a dispersion layer of the material during filtration drying.

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Lee, In. « Application of Smart Materials to Improve the Structural Performance(International Workshop on Smart Materials and Structural Systems, W03 Jointly organized by Material & ; Processing Division, Material & ; Mechanics Division, Dynamics & ; Control Division and Space Engineering Division.) ». Reference Collection of Annual Meeting 2004.8 (2004) : 272–73. http://dx.doi.org/10.1299/jsmemecjsm.2004.8.0_272.

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Habtour, Ed M., Daniel P. Cole, Christopher M. Kube, Todd C. Henry, Robert A. Haynes, Frank Gardea, Tomoko Sano et Tiedo Tinga. « Structural state awareness through integration of global dynamic and local material behavior ». Journal of Intelligent Material Systems and Structures 30, n^o 9 (24 février 2019) : 1355–65. http://dx.doi.org/10.1177/1045389x19828489.

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Structural health monitoring and nondestructive inspection techniques typically assess the lifecycle and reliability of high-value aerospace, mechanical, and civil systems. Maintenance and inspection intervals are typically time-based and dependent on the structural health monitoring/nondestructive inspection technique to detect macroscale damage resulting from fatigue or environmental damage. The current work proposes an integrated materials-structures-dynamics approach for providing state awareness of structural health. The proposed approach shifts the conventional structural health monitoring/nondestructive inspection focus of searching for cracks to a health state awareness based on tracking changes in the energetics of the materials-structures-dynamics states. Energy variations are tracked in a cantilevered structure exposed to nonlinear harmonic oscillation, where the strain energy of the beam was derived and used to determine a health state index. Nanoindentation was used to probe the near-surface mechanical properties of the beam to characterize local material variations as a function of fatigue cycles. A nonlinear ultrasonic approach was considered in order to connect the local material behavior changes to the variations in the dynamic performance of the beam. The intent of the investigation was to connect the traditionally detached materials, structural, and dynamics approaches to structural health monitoring/nondestructive inspection, while providing a framework for enabling damage precursor detection.

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ZAKO, Masaru, et Tetsusei KURASHIKI. « Introduction to composite material dynamics. Chapter 10. Strength of composite material. » Journal of the Japan Society for Composite Materials 23, n^o 4 (1997) : 144–50. http://dx.doi.org/10.6089/jscm.23.144.

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Furuya, Yasubumi, et T. Okazaki. « Recent Progress of Rapid-Solidified Multi-Functional Actuator/Sensor Materials and Devices for Smart Man/Material Interface and Systems(International Workshop on Smart Materials and Structural Systems, W03 Jointly organized by Material & ; Processing Division, Material & ; Mechanics Division, Dynamics & ; Control Division and Space Engineering Division.) ». Reference Collection of Annual Meeting 2004.8 (2004) : 294–95. http://dx.doi.org/10.1299/jsmemecjsm.2004.8.0_294.

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Cheng, Zhaonian. « Application of Molecular Dynamics Simulation in Material Structure Research ». International Journal of Modern Physics B 12, n^o 29n31 (20 décembre 1998) : 2986–89. http://dx.doi.org/10.1142/s0217979298001915.

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We introduce a bond order parameter (BOP) method to describe and identify the material structure by using the instantaneous configurations generated from molecular dynamics simulation. BOP is a universal method for different simulations and materials. A brief description of some examples of the application of this method in material structure research is given and the theory, method and results can be found in detail in the original references.

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CAPUTO, R., A. V. SUKHOV, N. V. TABIRYAN et C. UMETON. « DISTINCT DYNAMIC REGIMES IN A MATERIAL SYSTEM WITH OPTICALLY MODULATED DIFFUSIVITY ». Journal of Nonlinear Optical Physics & ; Materials 11, n^o 01 (mars 2002) : 25–30. http://dx.doi.org/10.1142/s0218863502000882.

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We report on distinct dynamic regimes of optically induced redistribution of molecules in a reacting material. The physical system is a mixture of photopolymerizable monomer and nematic liquid crystal with space-time modulated diffusivity. An empirical model is developed which provides an excellent description of all the stages of the experimentally observed highly intricate dynamics. This dynamics is governed by spatially inhomogeneous photogeneration of radicals, their diffusion, and the photopolymerization-induced change in the diffusion constant.

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Krzyzak, Aneta, Ewelina Kosicka, Marek Borowiec et Robert Szczepaniak. « Selected Tribological Properties and Vibrations in the Base Resonance Zone of the Polymer Composite Used in the Aviation Industry ». Materials 13, n^o 6 (18 mars 2020) : 1364. http://dx.doi.org/10.3390/ma13061364.

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The revolution in the global market of composite materials is evidenced by their increasing use in such segments as the transport, aviation, and wind industries. The innovative aspect of this research is the methodology approach, based on the simultaneous analysis of mechanical and tribological loads of composite materials, which are intended for practical use in the construction of aviation parts. Simultaneously, the methodology allows the composition of the composites used in aviation to be optimized. Therefore, the presented tests show the undefined properties of the new material, which are necessary for verification at the application stage. They are also a starting point for further research planned by the authors related to the improvement of the tribological properties of this material. In this article, the selected mechanical and tribological properties of an aviation polymer composite are investigated with the matrix of L285-cured hardener H286 and six reinforcement layers of carbon fabric GG 280P/T. The structure of a polymer composite has a significant influence on its mechanical properties; thus, a tribological analysis in the context of abrasive wear in reciprocating the movement for the specified polymer composite was performed. Moreover, the research was expanded to dynamic analysis for the discussed composite. This is crucial knowledge of material dynamics in the context of aviation design for the conditions of resonance vibrations. For this reason, experimental dynamical investigations were performed to determine the basic resonance of the material and its dynamics behavior response. The research confirmed the assumed hypotheses related to the abrasive wear process for the newly developed material, as well as reporting an empirical evaluation of the dependencies of the resonance zone from the fabric orientation sets.

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Sheng, Dong Fa. « Dynamical Behaviors of Nonlinear Viscoelastic Piles with Damage ». Advanced Materials Research 479-481 (février 2012) : 234–39. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.234.

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Base on the constitutive model expressed by convolution method for viscoelastic materials with damage, the initial-boundary-value problem analyzing static-dynamic behaviors of homogeneous, isotropic viscoelastic. Tiimoshenko beams with damage, placed on a viscoelastic foundation, is formulated under the case of finite deflections. And we adopt the model to simulate the dynamical behaviors of viscoelastic piles with damage placed on a viscoelastic foundation. The numerical methods in nonlinear dynamics are used to solve the simplified systems. The phase-trajectory diagrams, Poincare sections and bifurcation diagrams are all obtained. The influences of the material parameters of pile and foundation and load parameter on the dynamic behavior of the nonlinear system are investigated in detail.

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Bulatov, Vasily V., Meijie Tang et Hussein M. Zbib. « Crystal Plasticity from Dislocation Dynamics ». MRS Bulletin 26, n^o 3 (mars 2001) : 191–95. http://dx.doi.org/10.1557/mrs2001.41.

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The strength of a material is its ability to withstand an applied load without breaking or changing its shape. The strength of an ideal, defect-free crystal can be very high, but except for rather exotic materials such as micrometer-sized whiskers, crystals will fracture and/or deform plastically under stresses that are well below their ideal strength limits.

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Lazić, N. L., J. Budinski-Simendić, S. Ostojić, M. Kićanović et M. B. Plavšić. « Effects of Nano-Structure of Silica on Dynamic Properties of Styrene-Butadiene Rubber ». Materials Science Forum 555 (septembre 2007) : 473–78. http://dx.doi.org/10.4028/www.scientific.net/msf.555.473.

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Properties of four materials based on styrene-butadiene rubber (SBR), one without filler and the other three with the same amount but different types of silica fillers, are investigated. The fillers used are Vulkasil S and two new fillers, differing in nano-structures: specific surface area and particle aggregate morphology. All other components in the material formulations are the same as well as the procedures of material preparation. Thermal and thermo-mechanical properties of all four materials are investigated by modulated differential scanning calorimetry (MDSC) and dynamic mechanical analysis (DMA). Morphology of the materials is studied using scanning electron microscopy (SEM). The results for glass transition temperature (Tg ) of gum rubber and three filled rubbers, obtained by MDSC are for all four materials Tg = -50±1 0C, and by DMA loss tangent measurements also for all of them Tg = -29±1 0C. It indicates no significant influence of active silica fillers on the rubber network segment dynamics, in the temperature range close to Tg of SBR. But, at higher temperatures MDSC gives insights into dynamic transitions that are under the influence of filler interactions and sensitive to filler structure. The difference in Tg results obtained for the same material by MDSC and DMA can be understood in terms of different sensitivity of network segment dynamics to conditions provided by those two measuring methods.

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Freeman, Stephanie. « The Material and Social Dynamics of Motivation ». Science & ; Technology Studies 20, n^o 2 (1 janvier 2007) : 55–77. http://dx.doi.org/10.23987/sts.55212.

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Volunteer motivation has been a central theme in Free/Libre/Open Source Software (FLOSS) literature. This research has been largely dominated by economists who rely in their surveys on the distinction between intrinsic and extrinsic motivations and the ‘hacker ethic’ – for profi t juxtaposition. The paper argues that survey-based analytical frameworks and research designs have led to a focus on some motivational attributions at the expense of others. It then presents a case study that explores dynamic, non-individualistic and content-sensitive aspects of motivations. The approach is based on socio-cultural psychology and the author’s observations of a hybrid fi rm-community FLOSS project, OpenOffi ce.org. Instead of separating intrinsic motivations from extrinsic ones, it is argued that complex and changing patterns of motivations are tied to changing objects and personal histories prior to and during participation. The boundary between work and hobby in an individual’s participation path is blurred and shifting.

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Göttlich, Simone, Sebastian Kühn, Jan Peter Ohst, Stefan Ruzika et Markus Thiemann. « Evacuation dynamics influenced by spreading hazardous material ». Networks & ; Heterogeneous Media 6, n^o 3 (2011) : 443–64. http://dx.doi.org/10.3934/nhm.2011.6.443.

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Sweatman, Adam. « Book Review / Comptes rendu : Religion : Material Dynamics ». Studies in Religion/Sciences Religieuses 48, n^o 2 (juin 2019) : 305–6. http://dx.doi.org/10.1177/0008429819854911a.

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Soltani, P., D. J. Wagg, C. Pinna, R. Whear et C. Briody. « Nonlinear Dynamics of Structures with Material Degradation ». Journal of Physics : Conference Series 744 (septembre 2016) : 012123. http://dx.doi.org/10.1088/1742-6596/744/1/012123.

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Tripathi, Manoj Kumar, Kirti Chandra Sahu, George Karapetsas et Omar K. Matar. « Bubble rise dynamics in a viscoplastic material ». Journal of Non-Newtonian Fluid Mechanics 222 (août 2015) : 217–26. http://dx.doi.org/10.1016/j.jnnfm.2014.12.003.

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Nozaki, Hanae, et Satoshi Itho. « Lattice dynamics of a layered material BC2N ». Physica B : Condensed Matter 219-220 (avril 1996) : 487–89. http://dx.doi.org/10.1016/0921-4526(96)00787-9.

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Wang, C. Z., et K. M. Ho. « Material simulations with tight-binding molecular dynamics ». Journal of Phase Equilibria 18, n^o 6 (décembre 1997) : 516–29. http://dx.doi.org/10.1007/bf02665805.

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Denis, David J., et Antonio J. Macias. « Material Adverse Change Clauses and Acquisition Dynamics ». Journal of Financial and Quantitative Analysis 48, n^o 3 (juin 2013) : 819–47. http://dx.doi.org/10.1017/s0022109013000288.

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AbstractMaterial adverse change (MAC) clauses are a ubiquitous feature of acquisitions and exhibit substantial cross-sectional variation in the number and types of events that are excluded from being material adverse events (MAEs). MAEs are the underlying cause of 69% ofacquisition terminations and 80% of renegotiations. These renegotiations lead to substantial changes in the price offered to target shareholders. Acquisitions with fewer MAE exclusions are characterized by wider arbitrage spreads during the acquisition period and are associated with higher offer premiums. We conclude that MAC clauses have an economically important impact on the dynamics of corporate acquisitions.

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KITAGAWA, Hiroshi. « Molecular Dynamics and Estimation of Material Properties ». Journal of the Society of Mechanical Engineers 94, n^o 877 (1991) : 1000–1004. http://dx.doi.org/10.1299/jsmemag.94.877_1000.

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Singh, S. P., H. B. H. Gubran et K. Gupta. « Developments in Dynamics of Composite Material Shafts ». International Journal of Rotating Machinery 3, n^o 3 (1997) : 189–98. http://dx.doi.org/10.1155/s1023621x97000183.

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The review traces the development of composite shafts in varied applications. The different theoretical and experimental aspects of dynamics of composite shafts, under investigation for the past two decades, are reviewed and the state of the art discussed including possible future developments.

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Byron, Kyle. « Review : Religion : Material Dynamics, by David Chidester ». Nova Religio 23, n^o 3 (1 février 2020) : 124–25. http://dx.doi.org/10.1525/nr.2020.23.3.124.

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Wang, C. Z., K. M. Ho et C. T. Chan. « Material research with tight-binding molecular dynamics ». Computational Materials Science 2, n^o 1 (janvier 1994) : 93–102. http://dx.doi.org/10.1016/0927-0256(94)90051-5.

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Sulsky, D., et A. Kaul. « Implicit dynamics in the material-point method ». Computer Methods in Applied Mechanics and Engineering 193, n^o 12-14 (mars 2004) : 1137–70. http://dx.doi.org/10.1016/j.cma.2003.12.011.

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Guo, Ming, Mikkel Jensen, Jeffrey R. Moore, Fred C. Mackintosh et David A. Weitz. « Dynamics and Material Properties in Living Cells ». Biophysical Journal 102, n^o 3 (janvier 2012) : 693a. http://dx.doi.org/10.1016/j.bpj.2011.11.3762.

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Hicks, Darrell L., et Lorie M. Liebrock. « Parallel algorithms for implicit material dynamics schemes ». Applied Mathematics and Computation 46, n^o 3 (décembre 1991) : 179–209. http://dx.doi.org/10.1016/0096-3003(91)90116-5.

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Norville, C. C. « Inelastic Pipework Dynamics and Aseismic Design ». Journal of Pressure Vessel Technology 114, n^o 3 (1 août 1992) : 328–35. http://dx.doi.org/10.1115/1.2929048.

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This paper shows a simple correlation between elastic and inelastic dynamic pipework responses enabling realistic/pessimistic prediction of dynamic pipework responses beyond the elastic range using current elastic aseismic design procedures. In this paper, theoretical studies relating dynamic responses directly to nonlinear material stress/strain characteristics show how such a correlation arises, particularly for materials exhibiting a well-defined yield point inflection, and the evaluation of the correlative parameters (moduli and damping factors). The ABAQUS computer program was used to study and simulate the dynamic inelastic response characteristics of a pressurized tube in the form of simple beam and a pressurized cantilevered elbow (in-plane responses). Using comparative dynamic test results for these components, the foregoing design concepts were verified for representative cyclic material characteristics. So, given appropriate cyclic material characteristics, pessimistic incremental and reverse cyclic fatigue strains may be simply evaluated for loadings beyond the elastic range (for assessment against ASME fatigue criteria) using existing design techniques as shown in the paper.

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Zhao, Peng Yue, Yong Bo Guo et Guo Kun Qu. « Development of Nanomachining Mechanism Based on Molecular Dynamics Simulation ». Key Engineering Materials 667 (octobre 2015) : 41–46. http://dx.doi.org/10.4028/www.scientific.net/kem.667.41.

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Nanomachining technology has broad application prospects and molecular dynamics method is an important research tools for studying nanoscale material removal mechanism. This paper is focused on the analysis of basic principle of molecular dynamics method and the progress of nanomachining model. The nanomachining mechanism of single crystalline brittle materials and plastic materials are investigated completely, micro-nanomachining mechanism of polycrystalline material is also summarized, The challenges and future development of the nanometric machining mechanism study are also discussed.

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Ahadi, Aylin, Per Hansson et Solveig Melin. « Simulating Nanoindentation of Thin Cu Films Using Molecular Dynamics and Peridynamics ». Solid State Phenomena 258 (décembre 2016) : 25–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.25.

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Nanoindentation is a useful experimental method to characterize the micromechanical properties of materials. In this study molecular dynamics and peridynamics are used to simulate nanoindentation, with a spherical indenter targeting a thin single crystal Cu film, resting on an infinitely stiff substrate. The objective is to compare the results obtained from molecular dynamic simulations to those obtained using a peridynamic approach as regards the force-displacement curves and the deformation patterns after that the material parameters in the peridynamic model have been fitted to the force displacement curve from the molecular dynamic simulation.

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