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Journal articles on the topic 'Specific Dissipation technique'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Samuels, Robert J., and Nancy E. Mathis. "Orientation Specific Thermal Properties of Polyimide Film." Journal of Electronic Packaging 123, no. 3 (March 10, 2000): 273–77. http://dx.doi.org/10.1115/1.1347986.

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The present study examines the relationship between thermal conductivity and planarity in polyimide films. The samples tested were specially prepared to range in orientation from three dimensionally random to highly planar. The molecular structure and orientation of the polyimide film have been characterized by polarizing microscope techniques, while the thermal conductivity measurements were done using a new rapid nondestructive technique. This correlation represents the first time thermal conductivity has been measured by modified hot wire techniques and related to the internal structure of

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2

Jamroziak, Krzysztof, and Miroslaw Bocian. "Analysis of Non-Classical Models which Have been Subjected to Percussive Loads Using Equations of Energy and Power." Advanced Materials Research 1036 (October 2014): 608–13. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.608.

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The article presents an analysis of impact energy dissipation process with selected non-classical dynamic models. Identification of impact energy dissipation phenomena in layered mechanical systems (for example: composite ballistic shields) is a great challenge, because on the one hand a model with parameters responsible for the energy dissipation is being sought on the one hand and on the other it is necessary to optimise the number of parameters. The sought model should be reduced to a simple description of the phenomenon and should contain a complex reproduction of the whole mechanical syst

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3

Shang, Shou Ping, and Rong Shen. "HPFL Strip Strengthening Method for Masonry Structure." Advanced Materials Research 374-377 (October 2011): 2593–98. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.2593.

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Due to the various advantages, e.g. low cost, simple construction and high reliability, the HPFL strip reinforcement technique has been widely used in the field of civil engineering. A survey of related literatures on the research and application of the HPFL strip reinforcement technique for Masonry structures were shown in this paper. The HPFL strip reinforcement technique can significantly improve the properties of the wall, e.g. the aseismatic capacity, shear resistant strength, ductility, energy dissipation. Moreover, based on the real engineering structures, the specific design and constr

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4

CHEN, CHUNHONG, JIANG ZHAO, and MAJID AHMADI. "A NOVEL STATE ENCODING ALGORITHM FOR LOW POWER IMPLEMENTATION." Journal of Circuits, Systems and Computers 14, no. 03 (June 2005): 597–604. http://dx.doi.org/10.1142/s0218126605002428.

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State encoding problem assigns binary codes to given symbolic states such that a specific objective function such as power dissipation can be optimized in the final implementation. In this paper, we present a novel encoding technique to minimize the switching activity of any given FSMs for low power design. The experiments with standard benchmarks show that the proposed algorithm is a significant improvement over previous ones.

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5

Yu, Byunggyu, and Seok-Cheol Ko. "Power dissipation analysis of PV module under partial shading." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 2 (April 1, 2021): 1029. http://dx.doi.org/10.11591/ijece.v11i2.pp1029-1035.

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Photovoltaic (PV) generation has been growing dramatically over the last years and it ranges from small, rooftop-mounted or building integrated systems, to large utility scale power stations. Especially for rooftop-mounted PV system, PV modules are serially connected to match with PV inverter input voltage specification. For serially connected PV system, shading is a problem since the shaded PV module reduces the output whole string of PV modules. The excess power from the unshaded PV module is dissipated in the shaded PV module. In this paper, power dissipation of PV module under partial shad

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6

Marsden, J. E., and M. West. "Discrete mechanics and variational integrators." Acta Numerica 10 (May 2001): 357–514. http://dx.doi.org/10.1017/s096249290100006x.

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This paper gives a review of integration algorithms for finite dimensional mechanical systems that are based on discrete variational principles. The variational technique gives a unified treatment of many symplectic schemes, including those of higher order, as well as a natural treatment of the discrete Noether theorem. The approach also allows us to include forces, dissipation and constraints in a natural way. Amongst the many specific schemes treated as examples, the Verlet, SHAKE, RATTLE, Newmark, and the symplectic partitioned Runge–Kutta schemes are presented.

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Zhang, Qi, Xi Chen, and David Guéry-Odelin. "Connection between Inverse Engineering and Optimal Control in Shortcuts to Adiabaticity." Entropy 23, no. 1 (January 9, 2021): 84. http://dx.doi.org/10.3390/e23010084.

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We consider fast high-fidelity quantum control by using a shortcut to adiabaticity (STA) technique and optimal control theory (OCT). Three specific examples, including expansion of cold atoms from the harmonic trap, atomic transport by moving harmonic trap, and spin dynamics in the presence of dissipation, are explicitly detailed. Using OCT as a qualitative guide, we demonstrate how STA protocols designed from inverse engineering method can approach with very high precision optimal solutions built about physical constraints, by a proper choice of the interpolation function and with a very redu

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8

Zhang, Qi, Xi Chen, and David Guéry-Odelin. "Connection between Inverse Engineering and Optimal Control in Shortcuts to Adiabaticity." Entropy 23, no. 1 (January 9, 2021): 84. http://dx.doi.org/10.3390/e23010084.

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We consider fast high-fidelity quantum control by using a shortcut to adiabaticity (STA) technique and optimal control theory (OCT). Three specific examples, including expansion of cold atoms from the harmonic trap, atomic transport by moving harmonic trap, and spin dynamics in the presence of dissipation, are explicitly detailed. Using OCT as a qualitative guide, we demonstrate how STA protocols designed from inverse engineering method can approach with very high precision optimal solutions built about physical constraints, by a proper choice of the interpolation function and with a very redu

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9

Majzik, Zsolt, Martin Setvín, Andreas Bettac, Albrecht Feltz, Vladimír Cháb, and Pavel Jelínek. "Simultaneous current, force and dissipation measurements on the Si(111) 7×7 surface with an optimized qPlus AFM/STM technique." Beilstein Journal of Nanotechnology 3 (March 15, 2012): 249–59. http://dx.doi.org/10.3762/bjnano.3.28.

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We present the results of simultaneous scanning-tunneling and frequency-modulated dynamic atomic force microscopy measurements with a qPlus setup. The qPlus sensor is a purely electrical sensor based on a quartz tuning fork. If both the tunneling current and the force signal are to be measured at the tip, a cross-talk of the tunneling current with the force signal can easily occur. The origin and general features of the capacitive cross-talk will be discussed in detail in this contribution. Furthermore, we describe an experimental setup that improves the level of decoupling between the tunneli

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10

Tharajak, Jirasak, Tippaban Palathai, and Narongrit Sombatsompop. "Scratch Resistance and Adhesion Properties of PEEK Coating Filled with h-BN Nanoparticles." Advanced Materials Research 747 (August 2013): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amr.747.303.

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Effects of h-BN particles on mechanical properties and adhesion of semi-crystalline poly (ether-ether-ketone) (PEEK) coatings were studied. PEEK powder was mixed with various contents of h-BN nanoparticle in ethanol under ultrasonic mixing. As-mixed powders were sprayed onto low carbon steel substrate with thermal spray technique. The hardness, scratch hardness, specific scratch wear rate, prevailing deformation mechanisms and adhesion were obtained from scratch tests by varying the applied load. The damage geometry on scratched polymer surfaces and scratch wear volume loss were examined using

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11

Magnani, Federico, Abdelkader Bensada, Sergio Cinnirella, Francesco Ripullone, and Marco Borghetti. "Hydraulic limitations and water-use efficiency in Pinus pinaster along a chronosequence." Canadian Journal of Forest Research 38, no. 1 (January 2008): 73–81. http://dx.doi.org/10.1139/x07-120.

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Hydraulic constraints to water transport and water-use efficiency were studied in a Pinus pinaster Ait. chronosequence in Italy, consisting of four even-aged stands ranging from young (10 years old) to mature (75 years old), to explore the mechanisms involved in the decline of stand productivity as tree grow taller. Leaf-specific transpiration was estimated from sapflow rates measured by the heat dissipation technique, leaf-specific hydraulic conductance was computed from the slope of the relationship between transpiration and leaf water potential, long-term water-use efficiency was estimated

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12

Stepanov, Rodion, Peter Frick, Vladimir Dulin, and Dmitriy Markovich. "Analysis of mean and fluctuating helicity measured by TomoPIV in swirling jet." EPJ Web of Conferences 180 (2018): 02097. http://dx.doi.org/10.1051/epjconf/201818002097.

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Important role of helicity was theoretically predicted for the generation of large-scale magnetic fields and atmospheric vortices. Helicity can lead to a reduction of turbulent dissipation in the atmosphere or in a specific constrained flow, e.g. in pipe. We use the TomoPIV data (42 cube of grid points, resolution 0.84 mm) to measure 3D velocity field of turbulent swirling flows. We study spatial distribution of the mean and fluctuating components of energy and helicity. We find that helical turbulence excitation and decay along stream of the jet strongly depend on the inflow swirl. We observe

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13

Rezaiee-Pajand, Mohammad, and Mahdi Karimi-Rad. "A New Explicit Time Integration Scheme for Nonlinear Dynamic Analysis." International Journal of Structural Stability and Dynamics 16, no. 09 (November 2016): 1550054. http://dx.doi.org/10.1142/s0219455415500546.

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An explicit time integration method is presented for the linear and nonlinear dynamic analyses of structures. Using two parameters and employing the Taylor series expansion, a family of second-order accurate methods for the solution of dynamic problems is derived. The proposed scheme includes the central difference method as a special case, while damping is shown to exert no effect on the solution accuracy. The proposed method is featured by the following facts: (i) the relative period error is almost zero for specific values of the parameters; (ii) the numerical dissipation contained can help

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14

Warner, Amy, Ann Kjellstedt, Alba Carreras, Gerhard Böttcher, Xiao-Rong Peng, Patrick Seale, Nicholas Oakes та Daniel Lindén. "Activation of β3-adrenoceptors increases in vivo free fatty acid uptake and utilization in brown but not white fat depots in high-fat-fed rats". American Journal of Physiology-Endocrinology and Metabolism 311, № 6 (1 грудня 2016): E901—E910. http://dx.doi.org/10.1152/ajpendo.00204.2016.

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Activation of brown adipose tissue (BAT) and browning of white adipose tissue (WAT) present potential new therapies for obesity and type 2 diabetes. Here, we examined the effects of β3-adrenergic stimulation on tissue-specific uptake and storage of free fatty acids (FFA) and its implications for whole body FFA metabolism in diet-induced obese rats using a multi-radiotracer technique. Male Wistar rats were high fat-fed for 12 wk and administered β3-agonist CL316,243 (CL, 1 mg·kg−1·day−1) or saline via osmotic minipumps during the last 3 wk. The rats were then fasted and acutely infused with a t

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15

Katsura, Toshiya, Hiroshi Mizuuchi, Yukiya Hashimoto, and Ken-Ichi Inui. "Transport of procainamide via H+/tertiary amine antiport system in rabbit intestinal brush-border membrane." American Journal of Physiology-Gastrointestinal and Liver Physiology 279, no. 4 (October 1, 2000): G799—G805. http://dx.doi.org/10.1152/ajpgi.2000.279.4.g799.

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Transport characteristics of procainamide in the brush-border membrane isolated from rabbit small intestine were studied by a rapid-filtration technique. Procainamide uptake by brush-border membrane vesicles was stimulated by an outward H+ gradient (pHin= 6.0, pHout = 7.5) against a concentration gradient (overshoot phenomenon), and this stimulation was reduced when the H+ gradient was subjected to rapid dissipation by the presence of a protonophore, FCCP. An outward H+gradient-dependent procainamide uptake was not caused by H+diffusion potential. The initial uptake of procainamide was inhibit

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16

Gjengedal, Sondre, Vegard Brøtan, Ole T. Buset, Erik Larsen, Olav Å. Berg, Ole Torsæter, Randi K. Ramstad, Bernt O. Hilmo, and Bjørn S. Frengstad. "Fluid flow through 3D-printed particle beds: a new technique for understanding, validating, and improving predictability of permeability from empirical equations." Transport in Porous Media 134, no. 1 (July 6, 2020): 1–40. http://dx.doi.org/10.1007/s11242-020-01432-x.

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AbstractThe application of 3D technology for fabrication of artificial porous media samples improves porous media flow studies. The geometrical characteristics of a porous media pore channel: the channel shape, size, porosity, specific surface, expansion ratio, contraction ratio, and the tortuous pathway of the channel can be controlled through advanced additive manufacturing techniques (3D printing), computed tomography imagery (CT imaging) and image analysis methods. These 3D technologies have here been applied to construct and analyze four homogeneous porous media samples with predefined ge

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17

Kit, E., A. Cherkassky, T. Sant, and H. J. S. Fernando. "In Situ Calibration of Hot-Film Probes Using a Collocated Sonic Anemometer: Implementation of a Neural Network." Journal of Atmospheric and Oceanic Technology 27, no. 1 (January 1, 2010): 23–41. http://dx.doi.org/10.1175/2009jtecha1320.1.

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Abstract Although the integral quantities of atmospheric turbulence are conveniently measured using sonic anemometers, obtaining relevant finescale variables such as the kinetic energy dissipation using conventional hot-film/wire techniques remains a challenge because of two main difficulties. The first difficulty is the mean wind variability, which causes violation of the requirement that mean winds have a specific alignment with the hot-film/wire probe. To circumvent this problem, a combination of collocated sonic and hot-film anemometers, with the former measuring mean winds and aligning th

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18

Mazurkiewicz, Andrzej, and Andrzej Poprzeczka. "Evaluation of the quality of layers applied by LDT laser metal deposition." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (June 30, 2018): 591–96. http://dx.doi.org/10.24136/atest.2018.140.

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The article presents the results of a study of C45 carbon steel hardfacing using laser metal deposition with Stellit Co-21 powder. The microstructure of the cross-section of samples prepared with different scanning speed and the amount of used powder at constant laser power was observed. Analyzing the cross-sectional areas of the samples, it was found that, at specific production parameters, cracks occur in weld overlay, which should be associated with the amount of heat supplied and discharged, especially at the unheated basis.This may be confirmed by the presence of deposits of weakly branch

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19

Miyake, Shojiro, Takanori Shindo, and Masatoshi Miyake. "Regression Analysis of the Effect of Bias Voltage on Nano- and Macrotribological Properties of Diamond-Like Carbon Films Deposited by a Filtered Cathodic Vacuum Arc Ion-Plating Method." Journal of Nanomaterials 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/657619.

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Diamond-like carbon (DLC) films are deposited by bend filtered cathodic vacuum arc (FCVA) technique with DC and pulsed bias voltage. The effects of varying bias voltage on nanoindentation and nanowear properties were evaluated by atomic force microscopy. DLC films deposited with DC bias voltage of −50 V exhibited the greatest hardness at approximately 50 GPa, a low modulus of dissipation, low elastic modulus to nanoindentation hardness ratio, and high nanowear resistance. Nanoindentation hardness was positively correlated with the Raman peak ratioId/Ig, whereas wear depth was negatively correl

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20

Tsuchida, Satoshi, and Hiroshi Kuratsuji. "Stochastic theory of polarized light in nonlinear birefringent media: An application to optical rotation." International Journal of Modern Physics B 32, no. 12 (May 3, 2018): 1850147. http://dx.doi.org/10.1142/s0217979218501473.

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A stochastic theory is developed for the light transmitting the optical media exhibiting linear and nonlinear birefringence. The starting point is the two-component nonlinear Schrödinger equation (NLSE). On the basis of the ansatz of “soliton” solution for the NLSE, the evolution equation for the Stokes parameters is derived, which turns out to be the Langevin equation by taking account of randomness and dissipation inherent in the birefringent media. The Langevin equation is converted to the Fokker–Planck (FP) equation for the probability distribution by employing the technique of functional

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21

Pimont, François, Jean-Luc Dupuy, Rodman R. Linn, Jeremy A. Sauer, and Domingo Muñoz-Esparza. "Pressure-Gradient Forcing Methods for Large-Eddy Simulations of Flows in the Lower Atmospheric Boundary Layer." Atmosphere 11, no. 12 (December 11, 2020): 1343. http://dx.doi.org/10.3390/atmos11121343.

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Turbulent flows over forest canopies have been successfully modeled using Large-Eddy Simulations (LES). Simulated winds result from the balance between a simplified pressure gradient forcing (e.g., a constant pressure-gradient or a canonical Ekman balance) and the dissipation of momentum, due to vegetation drag. Little attention has been paid to the impacts of these forcing methods on flow features, despite practical challenges and unrealistic features, such as establishing stationary velocity or streak locking. This study presents a technique for capturing the effects of a pressure-gradient f

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22

Bryan, L. J., and S. R. O'Donnell. "Demonstration of catecholamine and resorcinolamine derivatives as formaldehyde-induced fluorescence in protein models." Journal of Histochemistry & Cytochemistry 36, no. 6 (June 1988): 615–20. http://dx.doi.org/10.1177/36.6.3367047.

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We assessed in protein droplet models the potential use of the formaldehyde condensation method for histochemical demonstration of a wide range of catecholamines and resorcinolamines. The experiments showed that all of the amines tested, except salbutamol and carbuterol, formed fluorophores, and that the fluorescence was specific [i.e., there was no fluorescence in the absence of formaldehyde, the fluorescence was quenched by water, and the fluorophores were subject to photodecomposition by the exciting (405-nm) light]. Peak wavelengths of the emission spectra were 480-485 nm for fluorophores

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23

Gómez López, Modesto, Nadia Mabel Pérez-Vielma, Haydee González Martínez, Eleazar Lara Padilla, Cindy Bandala, María Cristina González Torres та Ángel Miliar-García. "NLRP3, IL-1β, and Caspase-1 Gene Transcript Identification and Expression by QCM-D in Obese Children". Journal of Sensors 2019 (17 квітня 2019): 1–14. http://dx.doi.org/10.1155/2019/4323056.

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Background. Obesity in children is highly prevalent in Mexican population. Adipose tissue has been related to specific pro- and anti-inflammatory cytokine and inflammasome gene and protein expression patterns. Actually, there is no existing biosensor for detecting gene expression patterns in children with obesity. The quartz crystal microbalance with dissipation monitoring (QCM-D) has been used as a transducer for DNA biosensor design. Results. In this study, the gene expression pattern of IL-1β, NLRP3, and CASPASE-1 in children with obesity was successfully determined by means of QCM-D. Gene

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24

Kaltakci, M. Y., M. Ozturk, and M. H. Arslan. "An experimental investigation for external RC shear wall applications." Natural Hazards and Earth System Sciences 10, no. 9 (September 16, 2010): 1941–50. http://dx.doi.org/10.5194/nhess-10-1941-2010.

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Abstract. The strength and rigidity of most reinforced concrete (RC) buildings in Turkey, which are frequently hit by destructive earthquakes, is not at a sufficient level. Therefore, the result of earthquakes is a significant loss of life and property. The strengthening method most commonly preferred for these type of RC buildings is the application of RC infilled walls (shear walls) in the frame openings of the building. However, since the whole building has to be emptied and additional heavy costs arise during this type of strengthening, users prefer not to strengthen their buildings despit

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25

Levitt, Michael R., Michael C. Barbour, Sabine Rolland du Roscoat, Christian Geindreau, Venkat K. Chivukula, Patrick M. McGah, John D. Nerva, Ryan P. Morton, Louis J. Kim, and Alberto Aliseda. "Computational fluid dynamics of cerebral aneurysm coiling using high-resolution and high-energy synchrotron X-ray microtomography: comparison with the homogeneous porous medium approach." Journal of NeuroInterventional Surgery 9, no. 8 (July 12, 2016): 00.1–00. http://dx.doi.org/10.1136/neurintsurg-2016-012479.

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BackgroundComputational modeling of intracranial aneurysms provides insights into the influence of hemodynamics on aneurysm growth, rupture, and treatment outcome. Standard modeling of coiled aneurysms simplifies the complex geometry of the coil mass into a homogeneous porous medium that fills the aneurysmal sac. We compare hemodynamics of coiled aneurysms modeled from high-resolution imaging with those from the same aneurysms modeled following the standard technique, in an effort to characterize sources of error from the simplified model.MaterialsPhysical models of two unruptured aneurysms we

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Zhu, Zhiyong, Ana Sierra, Colin M. L. Burnett, Biyi Chen, Ekaterina Subbotina, Siva Rama Krishna Koganti, Zhan Gao, et al. "Sarcolemmal ATP-sensitive potassium channels modulate skeletal muscle function under low-intensity workloads." Journal of General Physiology 143, no. 1 (December 16, 2013): 119–34. http://dx.doi.org/10.1085/jgp.201311063.

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ATP-sensitive potassium (KATP) channels have the unique ability to adjust membrane excitability and functions in accordance with the metabolic status of the cell. Skeletal muscles are primary sites of activity-related energy consumption and have KATP channels expressed in very high density. Previously, we demonstrated that transgenic mice with skeletal muscle–specific disruption of KATP channel function consume more energy than wild-type littermates. However, how KATP channel activation modulates skeletal muscle resting and action potentials under physiological conditions, particularly low-int

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27

Malairuang, Kwanruthai, Morakot Krajang, Jatuporn Sukna, Krongchan Rattanapradit, and Saethawat Chamsart. "High Cell Density Cultivation of Saccharomyces cerevisiae with Intensive Multiple Sequential Batches Together with a Novel Technique of Fed-Batch at Cell Level (FBC)." Processes 8, no. 10 (October 21, 2020): 1321. http://dx.doi.org/10.3390/pr8101321.

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High cell density cultivation (HCDC) is developed for the production of microbial biomasses and their products. They must be produced from high concentrations of substrate, e.g., glucose or sucrose. In batch culture, a high concentration of those sugars >40–50% (w/v) cannot efficiently be utilized because of a dissolved O2 limitation causing the Crabtree effect that produces toxic by-products, i.e., ethanol and/or acetate, that inhibit cell growth. To prevent this effect, the HCDC is conducted with the fed-batch strategies. However, it has many disadvantages, i.e., complicated operations. T

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28

Mao, Kuanmin, Michael Yu Wang, Zhiwei Xu, and Tianning Chen. "Simulation and Characterization of Particle Damping in Transient Vibrations." Journal of Vibration and Acoustics 126, no. 2 (April 1, 2004): 202–11. http://dx.doi.org/10.1115/1.1687401.

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Particle damping is a technique of providing damping with granular particles embedded within small holes in a vibrating structure. The particles absorb kinetic energy through particle-to-wall and particle-to-particle frictional collisions. While the concept of particle damping seems to be simple and it has been used successfully in many fields for vibration reduction, it is difficult to predict the damping characteristics due to complex collisions in the dense particle flow. In this paper, we utilize the 3D discrete element method (DEM) for computer simulation and characterization of particle

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Jaquetti, Roberto Kirmayr, José Francisco de Carvalho Gonçalves, Henrique Eduardo Mendonça Nascimento, Karen Cristina Pires da Costa, Jair Max Furtunato Maia, and Flávia Camila Schimpl. "Fertilization and seasonality influence on the photochemical performance of tree legumes in forest plantation for area recovery in the Amazon." PLOS ONE 16, no. 5 (May 21, 2021): e0243118. http://dx.doi.org/10.1371/journal.pone.0243118.

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N-fixing leguminous species can reach atmospheric dinitrogen gas (N2), having an advantage under N-limited degraded environments. These N-fixers are constantly used as facilitative species. Chlorophyll a fluorescence (ChF) acknowledges how different species take up and use light energy during photosynthesis. These techniques assess stress and performance responses to photosynthesis and are used for the selection of species with potential for reforestation. Six Fabaceae species were selected for this study: three nonfixing species (Cenostigma tocantinum, Senna reticulata and Dipteryx odorata) a

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Badri, Mohammed, and Harold M. Mooney. "Q measurements from compressional seismic waves in unconsolidated sediments." GEOPHYSICS 52, no. 6 (June 1987): 772–84. http://dx.doi.org/10.1190/1.1442344.

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Several processing methods in both time and frequency domains have been used to compute the in‐situ specific dissipation function 1/Q, or its inverse, the quality factor Q, in water‐saturated unconsolidated sediments. These methods are based on measurements of spectral amplitude ratio, peak‐to‐peak and first‐peak amplitude ratio, rise time, pulse broadening, and the Futterman causal attenuation operator of an attenuating signal. Compressional seismic waves were generated from explosive sources ranging in size from 1 to 64 mg of silver azide and recorded at a depth of 7.62 m below the surface n

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Henning, Stephan W., Luke Jenkins, Sidni Hale, Christopher G. Wilson, John Tennant, Justin Moses, Mike Palmer, and Robert N. Dean. "Manual Assembly of 400um Bumped-Die GaN Power Semiconductor Devices." International Symposium on Microelectronics 2012, no. 1 (January 1, 2012): 000514–23. http://dx.doi.org/10.4071/isom-2012-poster_hale.

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Until recently, power semiconductors were usually produced as TO, power-PAK, and D-PAK style packaging, due to die size, thermal dissipation requirements, and the vertical flow of current through the devices. The introduction of GaN to power semiconductors has allowed manufactures to produce devices with approximately 9% the footprint of similar rated D-PAK Si MOSFETs. In addition, GaN semiconductors have much better theoretical limits of specific on-resistance to breakdown voltage, when compared to Si and SiC. As of now, GaN devices offer very good performance at much less the cost of SiC, ve

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Bassi, Roberto, and Luca Dall'Osto. "Dissipation of Light Energy Absorbed in Excess: The Molecular Mechanisms." Annual Review of Plant Biology 72, no. 1 (June 17, 2021): 47–76. http://dx.doi.org/10.1146/annurev-arplant-071720-015522.

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Light is essential for photosynthesis. Nevertheless, its intensity widely changes depending on time of day, weather, season, and localization of individual leaves within canopies. This variability means that light collected by the light-harvesting system is often in excess with respect to photon fluence or spectral quality in the context of the capacity of photosynthetic metabolism to use ATP and reductants produced from the light reactions. Absorption of excess light can lead to increased production of excited, highly reactive intermediates, which expose photosynthetic organisms to serious ri

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Akram, A., S. Ahmad, A. Rehman Jami, M. Sufyan, and U. Zahid. "Variations in the expansion and shear scalars for dissipative fluids." Modern Physics Letters A 33, no. 13 (April 30, 2018): 1850076. http://dx.doi.org/10.1142/s0217732318500761.

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This work is devoted to the study of some dynamical features of spherical relativistic locally anisotropic stellar geometry in f(R) gravity. In this paper, a specific configuration of tanh f(R) cosmic model has been taken into account. The mass function through technique introduced by Misner–Sharp has been formulated and with the help of it, various fruitful relations are derived. After orthogonal decomposition of the Riemann tensor, the tanh modified structure scalars are calculated. The role of these tanh modified structure scalars (MSS) has been discussed through shear, expansion as well as

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Khan, Sadeque Reza, Sumanth Kumar Pavuluri, Gerard Cummins, and Marc P. Y. Desmulliez. "Wireless Power Transfer Techniques for Implantable Medical Devices: A Review." Sensors 20, no. 12 (June 19, 2020): 3487. http://dx.doi.org/10.3390/s20123487.

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Wireless power transfer (WPT) systems have become increasingly suitable solutions for the electrical powering of advanced multifunctional micro-electronic devices such as those found in current biomedical implants. The design and implementation of high power transfer efficiency WPT systems are, however, challenging. The size of the WPT system, the separation distance between the outside environment and location of the implanted medical device inside the body, the operating frequency and tissue safety due to power dissipation are key parameters to consider in the design of WPT systems. This art

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Sarwar, Waseem, and Rehan Sarwar. "Vibration Control Devices for Building Structures and Installation Approach: A Review." Civil and Environmental Engineering Reports 29, no. 2 (June 1, 2019): 74–100. http://dx.doi.org/10.2478/ceer-2019-0018.

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Abstract Retrofit and structural design with vibration control devices have been proven repeatedly to be feasible seismic hazard mitigation approach. To control the structural response; supplemental energy dissipation devices have been most commonly used for energy absorption. The passive control system has been successfully incorporated in mid to high rise buildings as an appropriate energy absorbing system to suppress seismic and wind-induced excitation. The considerable theses that are highlighted include vibration control devices, the dynamic behavior of devices; energy dissipation mechani

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Caprili, Silvia, Francesco Morelli, Walter Salvatore, and Agnese Natali. "Design and Analysis of Automated Rack Supported Warehouses." Open Civil Engineering Journal 12, no. 1 (June 29, 2018): 150–66. http://dx.doi.org/10.2174/1874149501812010150.

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Background: The lack of codified standards for the design of automated rack supported warehouses forced engineers to use personal experience and commonly accepted rules. Objective: This paper investigates the efficacy of applying Eurocodes’ rules for the design and analysis of automated rack supported warehouses. Structural performance, construction feasibility and economic effort are considered. Method: A typical case study building was designed following the two approaches proposed by Eurocodes: elastic and dissipative. Results: The satisfaction of the capacity design requirements, used for

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Fialko, N., A. Stepanova, R. Navrodskaya, and S. Shevchuk. "EXERGIC EFFICIENCY OF THE HEAT RECOVERY UNIT FOR WASTE GASES OF A HEAT ENGINE OF A COGENERATION PLANT." Thermophysics and Thermal Power Engineering 42, no. 3 (June 19, 2020): 56–60. http://dx.doi.org/10.31472/ttpe.3.2020.6.

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The paper presents the results of a study of the efficiency of a heat recovery unit for waste gases of a heat engine of a cogeneration plant. The possibilities of using for this purpose the discrete-modular principle and complex methods of analyzing the efficiency of heat recovery systems, which are based on the methods of exergo-dissipative functions and exergic balances, are analyzed. The design features of the heat exchanger are considered and a conclusion is made about the possibility of presenting it as a system of eight discrete modules. The results of calculating the exergy characterist

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Muñoz-Esparza, Domingo, Robert D. Sharman, and Wiebke Deierling. "Aviation Turbulence Forecasting at Upper Levels with Machine Learning Techniques Based on Regression Trees." Journal of Applied Meteorology and Climatology 59, no. 11 (November 2020): 1883–99. http://dx.doi.org/10.1175/jamc-d-20-0116.1.

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AbstractWe explore the use of machine learning (ML) techniques, namely, regression trees (RT), for the purpose of aviation turbulence forecasting at upper levels [20–45 kft (~6–14 km) in altitude]. In particular, we develop a series of RT-based algorithms that include random forests (RF) and gradient-boosted regression trees (GBRT) methods. Numerical weather prediction model prognostic variables and derived turbulence diagnostics based on 6-h forecasts from the 3-km High-Resolution Rapid Refresh model are used as features to train these data-driven models. Training and evaluation are based on

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Globus, Tatiana, Igor Sizov, and Boris Gelmont. "Sub-THz specific relaxation times of hydrogen bond oscillations in E.coli thioredoxin. Molecular dynamics and statistical analysis." Faraday Discuss. 171 (2014): 179–93. http://dx.doi.org/10.1039/c4fd00029c.

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Hydrogen bonds (H-bonds) in biological macromolecules are important for the molecular structure and functions. Since interactions via hydrogen bonds are weaker than covalent bonds, it can be expected that atomic movements involving H-bonds have low frequency vibrational modes. Sub-Terahertz (sub-THz) vibrational spectroscopy that combines measurements with molecular dynamics (MD) computational prediction has been demonstrated as a promising approach for biological molecule characterization. Multiple resonance absorption lines have been reported. The knowledge of relaxation times of atomic osci

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Iturri, Jagoba, Andreas Breitwieser, Dietmar Pum, Uwe Sleytr, and José Toca-Herrera. "Electrochemical-QCMD Control over S-Layer (SbpA) Recrystallization with Fe2+ as Specific Ion for Self-Assembly Induction." Applied Sciences 8, no. 9 (August 25, 2018): 1460. http://dx.doi.org/10.3390/app8091460.

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The critical role of divalent ions (M²+) in the self-assembly of SbpA S-layer proteins (from Lysinibacillus sphaericus CCM 2177) into crystalline structures has been reported in several studies. Hence, ions such as magnesium, barium, nickel and, most commonly, calcium (Ca²+) have proven to trigger both protein-protein and protein-substrate interactions involved in the two-stage non-classical pathway recrystallization followed by SbpA units. As a result, two dimensional, crystalline nanometric sheets in a highly ordered tetrameric state (p4) can be formed on top of different surfaces. The use o

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Drougkas, Dimitris, Evagelos Karatsis, Maria Papagiannaki, Serafeim Chatzimoisiadis, Fotini Arabatzi, Stergios Maropoulos, and Alexander Tsouknidas. "Gait-Specific Optimization of Composite Footwear Midsole Systems, Facilitated through Dynamic Finite Element Modelling." Applied Bionics and Biomechanics 2018 (December 23, 2018): 1–9. http://dx.doi.org/10.1155/2018/6520314.

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Objective. During the last century, running shoes have been subject to drastic changes with incremental however improvements as to injury prevention. This may be, among others, due to the limited insight that experimental methodologies can provide on their 3D in situ response. The objective of this study was to demonstrate the effectiveness of finite element (FE) modelling techniques, in optimizing a midsole system as to the provided cushioning capacity. Methods. A commercial running shoe was scanned by means of micro computed tomography and its gel-based midsole, reverse-engineered to a 200 μ

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Marschik, Christian, Wolfgang Roland, Marius Dörner, Georg Steinbichler, and Volker Schöppner. "Leakage-Flow Models for Screw Extruders." Polymers 13, no. 12 (June 9, 2021): 1919. http://dx.doi.org/10.3390/polym13121919.

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Many theoretical analyses of extrusion ignore the effect of the flight clearance when predicting the pumping capability of a screw. This might be reasonable for conventional extruder screws with “normal” clearances but leads to errors when more advanced screw designs are considered. We present new leakage-flow models that allow the effect of the flight clearance to be included in the analysis of melt-conveying zones. Rather than directly correcting the drag and pressure flows, we derived regression models to predict locally the shear-thinning flow through the flight clearance. Using a hybrid m

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Scholl, Dean, Mike Cooley, Steve R. Williams, Dana Gebhart, David Martin, Anna Bates, and Robert Mandrell. "An Engineered R-Type Pyocin Is a Highly Specific and Sensitive Bactericidal Agent for the Food-Borne Pathogen Escherichia coli O157:H7." Antimicrobial Agents and Chemotherapy 53, no. 7 (April 6, 2009): 3074–80. http://dx.doi.org/10.1128/aac.01660-08.

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ABSTRACT Some strains of Pseudomonas aeruginosa produce R-type pyocins, which are high-molecular-weight phage tail-like protein complexes that have bactericidal activity against other Pseudomonas strains. These particles recognize and bind to bacterial surface structures via tail fibers, their primary spectrum determinant. R-type pyocins kill the cell by contracting a sheath-like structure and inserting their hollow core through the cell envelope, resulting in dissipation of the cellular membrane potential. We have retargeted an R-type pyocin to Escherichia coli O157:H7 by fusing a tail spike

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Barón, Matilde, Mónica Pineda, and María Luisa Pérez-Bueno. "Picturing pathogen infection in plants." Zeitschrift für Naturforschung C 71, no. 9-10 (September 1, 2016): 355–68. http://dx.doi.org/10.1515/znc-2016-0134.

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AbstractSeveral imaging techniques have provided valuable tools to evaluate the impact of biotic stress on host plants. The use of these techniques enables the study of plant-pathogen interactions by analysing the spatial and temporal heterogeneity of foliar metabolism during pathogenesis. In this work we review the use of imaging techniques based on chlorophyll fluorescence, multicolour fluorescence and thermography for the study of virus, bacteria and fungi-infected plants. These studies have revealed the impact of pathogen challenge on photosynthetic performance, secondary metabolism, as we

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Speich, S., H. Dijkstra, and M. Ghil. "Successive bifurcations in a shallow-water model applied to the wind-driven ocean circulation." Nonlinear Processes in Geophysics 2, no. 3/4 (December 31, 1995): 241–68. http://dx.doi.org/10.5194/npg-2-241-1995.

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Abstract. Climate - the "coarse-gridded" state of the coupled ocean - atmosphere system - varies on many time and space scales. The challenge is to relate such variation to specific mechanisms and to produce verifiable quantitative explanations. In this paper, we study the oceanic component of the climate system and, in particular, the different circulation regimes of the mid-latitude win driven ocean on the interannual time scale. These circulations are dominated by two counterrotating, basis scale gyres: subtropical and subpolar. Numerical techniques of bifurcation theory are used to stud th

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Valente, Marco. "Seismic Strengthening of Non-Ductile R/C Structures Using Infill Wall or Ductile Steel Bracing." Advanced Materials Research 602-604 (December 2012): 1583–87. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1583.

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This study deals with the seismic assessment and retrofitting of existing non-ductile R/C structures and the issue of selecting effective strengthening solutions is addressed. A displacement based procedure using nonlinear static pushover analyses is adopted in order to assess the main characteristics of the original structure and to select valuable retrofitting strategies. The procedure is applied to a four-storey R/C frame tested at the JRC ELSA Laboratory some years ago. The R/C frame was designed for gravity loads without specific earthquake-resistant provisions. Accurate numerical models

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Habib, Giuseppe, Fanni Kádár, and Bálint Papp. "Impulsive vibration mitigation through a nonlinear tuned vibration absorber." Nonlinear Dynamics 98, no. 3 (November 2019): 2115–30. http://dx.doi.org/10.1007/s11071-019-05312-y.

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Abstract The dynamics of a nonlinear passive vibration absorber conceived to mitigate vibrations of a nonlinear host structure is considered in this paper. The system under study is composed of a primary system, consisting of an undamped nonlinear oscillator of Duffing type, and a nonlinear dynamic vibration absorber, denominated nonlinear tuned vibration absorber (NLTVA). The NLTVA consists of a small mass, attached to the host structure through a linear damper, a linear and a cubic spring. The host structure is subject to free vibrations and the performance of the NLTVA is evaluated with res

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Naveen, Jesuarockiam, Mohammad Jawaid, Kheng Lim Goh, Degalhal Mallikarjuna Reddy, Chandrasekar Muthukumar, Tamil Moli Loganathan, and Koduri Naga Ganapathy Lakshmi Reshwanth. "Advancement in Graphene-Based Materials and Their Nacre Inspired Composites for Armour Applications—A Review." Nanomaterials 11, no. 5 (May 8, 2021): 1239. http://dx.doi.org/10.3390/nano11051239.

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The development of armour systems with higher ballistic resistance and light weight has gained considerable attention as an increasing number of countries are recognising the need to build up advanced self-defence system to deter potential military conflicts and threats. Graphene is a two dimensional one-atom thick nanomaterial which possesses excellent tensile strength (130 GPa) and specific penetration energy (10 times higher than steel). It is also lightweight, tough and stiff and is expected to replace the current aramid fibre-based polymer composites. Currently, insights derived from the

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Chaves, Manuela M., João P. Maroco, and João S. Pereira. "Understanding plant responses to drought — from genes to the whole plant." Functional Plant Biology 30, no. 3 (2003): 239. http://dx.doi.org/10.1071/fp02076.

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In the last decade, our understanding of the processes underlying plant response to drought, at the molecular and whole-plant levels, has rapidly progressed. Here, we review that progress. We draw attention to the perception and signalling processes (chemical and hydraulic) of water deficits. Knowledge of these processes is essential for a holistic understanding of plant resistance to stress, which is needed to improve crop management and breeding techniques. Hundreds of genes that are induced under drought have been identified. A range of tools, from gene expression patterns to the use of tra

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Wilcoxon, R. K., and A. Moutsoglou. "Second Law Analysis in Assessing Constant Power Input Systems." Journal of Heat Transfer 113, no. 2 (May 1, 1991): 321–28. http://dx.doi.org/10.1115/1.2910564.

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A criterion for comparing the relative performance of various heat transfer augmentation methods used in constant power input systems is introduced. The analysis is based on the principle of minimizing the rate of total entropy generation. The heat transfer load (HTL), a parameter determined by the operating requirements of the heat dissipating process that indicates the difficulty of the heat transfer duty to be performed, is defined in the present study. By comparing the irreversibility distribution ratio (φ) of various configurations at a given heat transfer load, the most exergy efficient

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