Готові списки джерел за темами / Multilayer Stack Assemblies

Добірка наукової літератури з теми "Multilayer Stack Assemblies"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Multilayer Stack Assemblies"

1

Pan, Tsung-Yu, and Yi-Hsin Pao. "Deformation in Multilayer Stacked Assemblies." Journal of Electronic Packaging 112, no. 1 (March 1, 1990): 30–34. http://dx.doi.org/10.1115/1.2904337.

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Анотація:
A linear-elastic analytical model has been developed to describe the deformed geometry of a multi-layered stack assembly subject to thermal loading. The model is based on Timoshenko’s bimetal thermostat analysis [1] and consists of a series of first-order polynomial equations. The radius of curvature, bending moment, force, horizontal and vertical displacements can be determined numerically. These quantities match well with finite element analysis. Calculations for silicon power transistor stacks are presented in order to demonstrate the model capability. The results from this analyitcal model have been found to correlate well with experimental measurements when an appropriate secant modulus is used to represent the nonlinear stress-strain behavior of solder.
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2

Pavlichenko, Ida, Armin T. Exner, Gennady Logvenov, Giuseppe Scarpa, Paolo Lugli, and Bettina V. Lotsch. "Nanomorphology tuning of the thermal response of TiO2/SiO2 Bragg stacks." Canadian Journal of Chemistry 90, no. 12 (December 2012): 1069–77. http://dx.doi.org/10.1139/v2012-081.

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Herein, we present a comparative study of thermo- and environmentally responsive TiO2/SiO2 one-dimensional photonic crystals (Bragg stacks) fabricated by different deposition methods and fabrication schemes, featuring various multilayer nanomorphologies. These include dense multilayer systems processed by physical vapor deposition and wet-chemistry protocols, as well as porous systems, namely, nanoparticle-based optical filters exhibiting textural porosity, and evaporation-induced self-assembled mesoporous Bragg stacks exhibiting predominantly structural porosity, as well as hybrid structures comprising both dense and porous layers. We investigate the spectral shift of the photonic stop band for the different Bragg stack nanomorphologies induced by the humidity-enhanced thermo-optic effect in a temperature range from 15 to 60 °C. We also demonstrate the response and recovery kinetics of the multilayer systems during external changes in ambient humidity. Notably, the choice of fabrication method plays a significant role in the thermal and humidity response of the system. Taking advantage of different material nanomorphologies we can tune the thermal shift of the photonic stop band in the range 0.2–32.9 nm for the Bragg stacks at ambient relative humidity. In addition, we can design dense multilayer systems nonresponsive to humidity and achieve time responses of the porous systems to external changes in humidity ranging from about 1 to 3 s.
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3

Franz, Gérald, Pascal Vantomme, and Muhammad Hafiz Hassan. "A Review on Drilling of Multilayer Fiber-Reinforced Polymer Composites and Aluminum Stacks: Optimization of Strategies for Improving the Drilling Performance of Aerospace Assemblies." Fibers 10, no. 9 (September 9, 2022): 78. http://dx.doi.org/10.3390/fib10090078.

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Анотація:
In recent years, the use of hybrid composite stacks, particularly CFRP/Al assemblies, and fiber metal laminates (FMLs) has progressively become a convincing alternative to fiber-reinforced polymers (FRPs) and conventional metal alloys to meet the requirements of structural weight reduction in the modern aerospace industry. These new structural materials, which combine greater mechanical properties with low specific mass, are commonly assembled by riveted and bolted joints. The drilling operation, which represents the essential hole-making process used in the aerospace industry, proves particularly challenging when it comes to achieving damage-free holes with tight tolerances for CFRP/Al stacks in one-shot operations under dry conditions due to the dissimilar mechanical and thermal behavior of each constituent. Rapid and severe tool wear, heat damage, oversized drilled holes and the formation of metal burrs are among the major issues induced by the drilling of multi-material stacks. This paper provides an in-depth review of recent advancements concerning the selection of optimized strategies for high-performance drilling of multi-material stacks by focusing on the significant conclusions of experimental investigations of the effects of drilling parameters and cutting tool characteristics on the drilling performance of aerospace assemblies with CFRP/Al stacks and FML materials. The feasibility of alternative drilling processes for improving the hole quality of hybrid composite stacks is also discussed.
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4

Ray, Chase A., and Steven R. Anton. "Multilayer piezoelectret foam stack for vibration energy harvesting." Journal of Intelligent Material Systems and Structures 28, no. 3 (July 28, 2016): 408–20. http://dx.doi.org/10.1177/1045389x16657420.

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Анотація:
Electronic devices are high-demand commodities in today’s world, and such devices will continue increasing in popularity. Currently, batteries are implemented to provide power to these devices; however, the need for battery replacement, their cost, and the waste associated with battery disposal present a need for advances in self-powered technology. Energy harvesting technology has great potential to alleviate the drawbacks of batteries. In this work, a novel piezoelectret foam material is investigated for low-level vibration energy harvesting. Specifically, piezoelectret foam assembled in a multilayer stack configuration is explored. Modeling and experimentation of the stack when excited in compression at low frequencies are performed to investigate piezoelectret foam for multilayer energy harvesting. An equivalent circuit model derived from the literature is used to model the piezoelectret stack. Two 20-layer prototype devices and one 40-layer prototype device are fabricated and experimentally tested via harmonic base excitation. Electromechanical frequency response functions between input acceleration and output voltage are measured experimentally. Modeling results are compared to experimental measurements to assess the fidelity of the model near resonance. Finally, energy harvesting experimentation in which the device is subject to harmonic base excitation at the fundamental natural frequency is conducted to determine the ability of the stack to successfully charge a capacitor. For a 20-layer stack excited at 0.5 g, a 100-µF capacitor is charged to 1.45 V in 15 min, and produces a peak power of 0.45 µW. A 40-layer stack is found to charge a 100-µF capacitor to 1.7 V in 15 min when excited at 0.5 g, and produce a peak power of 0.89 µW.
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5

Cho, Jinhan, and Frank Caruso. "Polymeric Multilayer Films Comprising Deconstructible Hydrogen-Bonded Stacks Confined between Electrostatically Assembled Layers." Macromolecules 36, no. 8 (April 2003): 2845–51. http://dx.doi.org/10.1021/ma021049n.

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6

Boiko, O., O. Komarov, R. Vasyuta, V. Nazarenko, Yu Slominskiy, and T. Schneider. "Nano-Architecture of Self-Assembled Monolayer and Multilayer Stacks of Lyotropic Chromonic Liquid Crystalline Dyes." Molecular Crystals and Liquid Crystals 434, no. 1 (June 2005): 305/[633]—314/[642]. http://dx.doi.org/10.1080/15421400590955019.

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7

Friedlein, Rainer, Ying Wang, Antoine Fleurence, Fabio Bussolotti, Yoichi Ogata, and Yukiko Yamada-Takamura. "Stacks of Nucleic Acids as Molecular Wires: Direct Measurement of the Intermolecular Band Dispersion in Multilayer Guanine Assemblies." Journal of the American Chemical Society 132, no. 37 (September 22, 2010): 12808–10. http://dx.doi.org/10.1021/ja104839d.

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8

Srinivasan, Charan, Mary E. Anderson, R. Jayaraman, Paul S. Weiss, and Mark W. Horn. "Electrically isolated nanostructures fabricated using self-assembled multilayers and a novel negative-tone bi-layer resist stack." Microelectronic Engineering 83, no. 4-9 (April 2006): 1517–20. http://dx.doi.org/10.1016/j.mee.2006.01.265.

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9

Bertocci, Francesco, Andrea Grandoni, and Tatjana Djuric-Rissner. "Scanning Acoustic Microscopy (SAM): A Robust Method for Defect Detection during the Manufacturing Process of Ultrasound Probes for Medical Imaging." Sensors 19, no. 22 (November 8, 2019): 4868. http://dx.doi.org/10.3390/s19224868.

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Анотація:
The main aim of this paper is to provide the feasibility of non-destructive testing (NDT) method, such as scanning acoustic microscopy (SAM), for damage detection in ultrasound (US) probes for medical imaging during the manufacturing process. In a highly competitive and demanding electronics and biomedical market, reliable non-destructive methods for quality control and failure analysis of electronic components within multi-layered structures are strongly required. Any robust non-destructive method should be capable of dealing with the complexity of miniaturized assemblies, such as the acoustic stack of ultrasonic transducers. In this work, the application of SAM in an industrial scenario was studied for 24 samples of a phased array probe, in order to investigate potential internal integrity, to detect damages, and to assess the compliance of high-demanding quality requirements. Delamination, non-homogeneous layers with micron-thickness, and entrapped air bubbles (blisters) in the bulk of US probe acoustic stacks were detected and studied. Analysis of 2D images and defects visualization by means of ultrasound-based NDT method were compared with electroacoustic characterization (also following as pulse-echo test) of the US probe through an ad-hoc measurement system. SAM becomes very useful for defect detection in multilayered structures with a thickness of some microns by assuring low time-consuming (a limit for other NDT techniques) and quantitative analyses based on measurements. The study provides a tangible contribution and identifies an advantage for manufacturers of ultrasound probes that are oriented toward continuous improvement devoted to the process capability, product quality, and in-process inspection.
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10

Mshar, Alecsander D., Allen G. Owen, Daniel D. Arnold, Pieter B. Visscher, Randy K. Dumas, and Subhadra Gupta. "FORC analysis of nanopatterned vs unpatterned films: Coercivity and switching mechanisms." AIP Advances 12, no. 3 (March 1, 2022): 035230. http://dx.doi.org/10.1063/9.0000336.

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Анотація:
We have studied the use of self-assembled block copolymers to pattern multilayers of Co and Pd on silicon wafers. Stacks ranging from four to twelve bilayers of Co (0.3 nm)/Pd (0.8 nm) were sputtered onto Ta/Pd seed layers and capped with 3 nm of Ta and were found to have perpendicular magnetic anisotropy as-deposited. The block copolymer polystyrene- block-poly(ferrocenyl dimethylsilane) (PS-b-PFS) was dissolved in toluene and spun onto the wafers. The polymers were phase-separated by heat treatment, leaving self-assembled PFS spheres embedded in PS, which was removed by oxygen-plasma ashing. The PFS spheres were then used as masks to ion-mill the Co/Pd multilayers into nanopillars. To study the effect of etch time and etch angle on the coercivity distribution, we synthesized samples in a Design of Experiments-(DoE)- in these two factors. Scanning electron micrographs showed nanopillars ranging from 15 to 30 nm in diameter, depending primarily on etch time. M-H loops measured on both patterned and unpatterned wafers showed an increase of up to 130% in overall coercivity upon patterning. First Order Reversal Curves (FORC) were measured, and the resulting FORC distributions displayed using a smoothing program (FORCinel) and one that can display the raw data without smoothing (FORC+). We find that FORC+ reveals information about fine-scale structure and switching mechanism that cannot be seen in the smoothed display.
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Дисертації з теми "Multilayer Stack Assemblies"

1

Chandran, Ashwin. "Self-Assembled Multilayered Dielectric Spectral Filters." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/30859.

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Анотація:
Thin film optical filters are made by depositing thin films of optical materials on a substrate in such a way as to produce the required optical and mechanical properties. The Electrostatic Self Assembly (ESA) process is accomplished by the alternate adsorption of poly-anionic and poly-cationic molecules on progressive oppositely charged surfaces. This technique offers several advantages such as ease of fabrication, molecular level uniformity, stable multilayer synthesis and avoidance of the need for a vacuum environment. The ESA process offers an excellent choice for manufacturing optical thin film coatings due to its capability to incorporate multiple properties into films at the molecular level and its ability to be a fast and inexpensive process. The ESA process, as a method for manufacturing optical thin film filters has been investigated in detail in this thesis. A specific design was made and analyzed using TFCalc, a commercial thin film design software. Sensitivity analysis detailing the changes in filter response to errors in thickness and refractive index produced by the ESA process were done. These proved that with a high level of quality control, highly reliable and accurate optical thin films can be made by the ESA process.
Master of Science
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2

Papavasiliou, Kriton. "Construction of an Optical Quarter-Wave Stack Using the ISAM (Ionic Self-Assembled Multilayers) Technique." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77134.

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Анотація:
The purpose of this thesis is to make a broadband antireflection coating configuration known as a quarter-wave stack consisting of one layer of titania and of one layer of silica nanoparticles. We utilize much that is already known about silica nanoparticle deposition. The first objective of this thesis is deposition and characterization of titania nanoparticle films deposited on glass microscope slides by a technique known as Ionic Self-Assembled Multilayers or ISAM deposition. This technique takes advantage of the electrostatic attraction between oppositely charged materials and ideally results in a uniform nanoparticle film whose thickness and optical properties can be tightly controlled. Deposition of a quarter-wave stack based on ISAM deposition of silica and titania nanoparticles is significantly simpler and less expensive than alternative deposition methods. Initial attempts to deposit titania films were unsuccessful because of excess diffuse scattering due to inhomogeneities in the film. In order to reduce diffuse scattering, two approaches were considered. The first approach was to improve the deposition process itself by experimenting with different values of deposition parameters such as solution pH and solution molarity. The other approach focused on removing the large nanoparticle aggregates from the colloidal solutions of titania nanoparticles that were suspected to be responsible for rough film surfaces resulting in diffuse scattering. This approach was successful. In addition, evidence suggested that surface roughness contributed more to diffuse scattering than the bulk of the films. After minimizing diffuse scattering from titania nanoparticle films, we used known results from research on silica nanoparticle films to deposit quarter-wave stacks consisting of one layer of titania nanoparticles with high refractive index and one layer of silica nanoparticles with low refractive index. This contrast in refractive indices is a desirable characteristic of quarter-wave stacks. The thicknesses and refractive indices of the two layers in the quarter-wave stacks were measured by ellipsometry and compared to the nominal thicknesses of these layers. Finally, the reflectance was derived from a model of the quarter-wave stack and was compared to the measured reflectance. It was found that construction of a quarter-wave stack by ISAM is possible but that it will be necessary to acquire data from more experiments.
Ph. D.
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Тези доповідей конференцій з теми "Multilayer Stack Assemblies"

1

B, Rammohan, Sanjay Singh Chauhan, and Arvind Krishna. "Development of an Analytical Tool for Multilayer Stack Assemblies." In 16th Asia Pacific Automotive Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-28-0083.

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2

Grèzes-Besset, C., F. Chazallet, G. Albrand, and E. Pelletier. "Synthesis and research of the optimum conditions for the optical monitoring of non-quarterwave multilayers." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oic.1992.othb2.

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Анотація:
Many optical filtering problems require the use of assemblies of layers having thicknesses which bear no obvious relationship to each other. After a brief review and comparison of some numerical techniques of synthesis which are used to obtain specific designs with given properties, we discuss the problems connected with production. The stacks are realized by Ion Assisted Deposition and Ion Plating techniques. For each technique we have reached a good knowledge of the refractive indices of the layers that we can produce starting from different materials (TiO2, Ta2O5, SiO2, ..) and we can demonstrate that conditions of deposition are correctly adjusted in order to prevent any shift of refractive index between vacuum (during growth of the film) and air (after deposition).
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3

Peñaranda, Juan, Jhon Manchola, Gustavo Casado, Egor Kovarskiy, Giuseppe Solar, Nestor Campos, Yulei Diaz, et al. "Novel Drilling Engineering Methodology to Enhance Wellbore Positioning and Performance Using Disruptive MWD/LWD Technology." In SPE Latin American and Caribbean Petroleum Engineering Conference. SPE, 2023. http://dx.doi.org/10.2118/213158-ms.

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Анотація:
Abstract The Llanos basin is one of the most important areas in Colombia, due to its contribution to the national oil production and the development plans managed by operator companies. The projects in llanos basin face different challenges such as heavy oil production, low reservoir thickness, lateral variations, active aquifers, and low resistivity contrast of its fluvio-estuarine sands. These circumstances demand the design of complex horizontal profiles, being the TVD definition and well placement paramount to land and maintain the trajectories in the sweet spot. This paper shows how the application of disruptive Measurement while drilling (MWD) and logging while drilling (LWD) technologies with the support of novel drilling engineering methodologies, permitted to reach difficult reservoirs and maintain production in Ocelote, Guarrojo and Pintado fields, with a positive outcome in drilling performance and sustainability. The key actions for the mentioned success, described in this paper, were:Introduction of a disruptive MWD technology to enhance the true vertical depth (TVD) definition in the 8 ½" landing section using the Definitive Dynamic Surveys (DDS) capability of the tool combined with a new methodology to define the optimum survey frequency while drilling.Optimized positive displacement motor (PDM) bore hole assemblies (BHAs) and fit-for-purpose drill string configurations leveraged in an engineering procedure that maximizes weight transfer to the bit and avoids buckling.Digital enabled workflows to perform well planning and engineering calculations.Introduction of an LWD technology that provides an outstanding definition of the resistive channels in the sands, managing to map and define zones with less than 4 ft TVD thickness. The new survey methodology permitted the capture of an optimum amount of data in the landing section which enabled a more accurate TVD calculation, decreasing the uncertainty in the structural model, and improving the correlation for future wells. In addition, the drilling dynamic survey saved up to five minutes per stand reducing also the differential stuck pipe risk. The deep azimuthal resistivity technology successfully mapped multiple layers despite their low resistivity contrast, clearly differentiating their resistive properties to support real-time proactive decisions and augment the production well after well. In the last two years, there has been an increase in net pay from 65% to 80% (Average) along with a 30% increase in the length of horizontal sections thanks to the implementation of these technologies. The complex well profiles drilled in the past with rotary steerable systems now are possible with the optimized motor BHAs. From the operator's perspective, the optimum trajectory design and precise placement of the wells have permitted draining reservoirs in a more effective way increasing the project profitability. The methodology designed to define the optimum survey frequency, by taking advantage of the definitive dynamic survey technology, represents a new approach to improve TVD definition in the industry without incurring extra data processing or additional parts in the survey program. The BHA design process permitted drilling efficiently, being this technique a didactic reference for horizontal or high inclination wells. The novel multilayer mapping-while-drilling technology used can be applied in thin reservoirs with similar conditions.
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