Determination of anisotropic geometrical parameters for the electrical characterization of carbon/epoxy composite during oven curing

2016 ◽  
Vol 80 ◽  
pp. 204-216 ◽  
Author(s):  
Sonia Sassi ◽  
Philippe Marguerès ◽  
Philippe Olivier ◽  
Rébecca Le Begue
Keyword(s):  
Epoxy Composite ◽  
Electrical Characterization ◽  
Geometrical Parameters

Study of a-Si:H / c-Si Heterojunctions for PV Applications

1996 ◽  
Vol 420 ◽  
Author(s):  
F. Zignani ◽  
R. Galloni ◽  
R. Rizzoli ◽  
M. Ruth ◽  
C. Summonte ◽  
...  
Keyword(s):  
Gas Phase ◽  
Open Circuit Voltage ◽  
Accurate Determination ◽  
Electrical Characterization ◽  
Silicon Layer ◽  
Open Circuit ◽  
Hydrogen Dilution ◽  
Intrinsic Efficiency

Abstracta-Si:H / c-Si heterojunction diodes were produced by PECVD with varying amorphous silicon layer thickness and hydrogen dilution of the gas phase. An accurate determination of the growth rate also in the initial stages of the deposition was made possible by an original chemical method based on the dissolution of the films followed by spectroscopical analysis of the obtained solution.The electrical characterization of the diodes confirms the generation - recombination - multitunneling nature of the transport. Although H2 dilution is important, however, beyond a certain level it is detrimental for the junction quality, probably due to the transition to a microcrystalline phase deposition. Solar cells were also produced, the best results being an open circuit voltage of 610 mV and an intrinsic efficiency of 14.2%.

scholarly journals Electrical properties and microstructure fractal analysis of magnesium-modified aluminium-silicate ceramics

2011 ◽  
Vol 43 (2) ◽  
pp. 193-204 ◽  
Author(s):  
J. Purenovic ◽  
V.V. Mitic ◽  
Lj. Kocic ◽  
V.B. Pavlovic ◽  
V. Paunovic ◽  
...  
Keyword(s):  
Fractal Analysis ◽  
Sintering Temperature ◽  
Electrical Characterization ◽  
Porous Ceramics ◽  
Before And After ◽  
High Degree ◽  
Highly Porous ◽  
Aluminium Silicate

The addition of Mg2(NO)3 and some active additives, composed of Al salts, to the mixtures of kaolinite and bentonite can provide clay compositions which, after sintering at high temperatures, produce very porous ceramics with microcrystalline and amorphous regions and highly developed metalized surfaces (mainly with magnesium surplus). Characterization of sintered samples was done before and after treatment in ?synthetic water?, i.e. in aqueous solution of arsenic-salt. Microstructure investigations have revealed non-uniform and highly porous structure with broad distribution of grain size, specifically shaped grains and high degree of agglomeration. Electrical characterization was estimated by determining dielectric constant and electrical resistivity in function of active additives amount and sintering temperature. Fractal analysis has included determination of grain contour fractal dimension.

scholarly journals A Street Graph-Based Morphometric Characterization of Two Large Urban Areas

2021 ◽  
Vol 13 (3) ◽  
pp. 1025
Author(s):  
Luca Salvadori ◽  
Maria Grazia Badas ◽  
Annalisa Di Bernardino ◽  
Giorgio Querzoli ◽  
Simone Ferrari
Keyword(s):  
Aspect Ratio ◽  
Urban Areas ◽  
Accurate Determination ◽  
Geometrical Parameters ◽  
Urban Microclimate ◽  
Area Index ◽  
Planar Area ◽  
Morphometric Characterization

Urban microclimate modelling, both numerical and in the laboratory, has strong implications in many relevant health and life-style management issues e.g., in studies for assessment and forecast of air quality (for both outdoor and, as boundary conditions, indoor investigations), for thermometric trend analysis in urban zones, in cultural heritage preservation, etc. Moreover, the study of urban microclimate modelling is largely promoted and encouraged by international institutions for its implication in human health protection. In the present work, we propose and discuss an adaptive street graph-based method aimed at automatically computing the geometrical parameters adopted in atmospheric turbulent flow modelling. This method has been applied to two real cases, the Italian cities of Rome and Cagliari, and its results has been compared with the ones from traditional methods based on regular grids. Results show that the proposed method leads to a more accurate determination of the urban canyon parameters (Canyon Aspect Ratio and Building Aspect Ratio) and morphometric parameters (Planar Area Index and Frontal Area Index) compared to traditional regular grid-based methods, at least for the tested cases. Further investigations on a larger number of different urban contexts are planned to thoroughly test and validate the proposed algorithm.

Overcoming the Challenges of Parallel, SRAM Shorts Test Structures with EBIRCH

2018 ◽  
Author(s):  
Noor Jehan Saujauddin ◽  
Lloyd Smith ◽  
Randy Newkirk ◽  
Kevin Davidson ◽  
Gregory M. Johnson ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Electrical Characterization ◽  
Advanced Technology ◽  
Massively Parallel ◽  
Resistance Change ◽  
Design Elements ◽  
Time Required ◽  
Technology Nodes

Abstract Massively parallel test structures, based on looking for shorts between certain design elements in the SRAM cells, are becoming increasingly relied upon in yield characterization. The localization of electrical shorts in these structures has posed significant challenges in advanced technology nodes, due to the size, and design complexity. Several of the traditional methods (nanoprobing, OBIRCH, etc.) are shown to be inadequate to find defects in SRAM cells, either due to resolution, or time required. In recent years, the Electron Beam Induced Resistance Change (EBIRCH) technique has increasingly been utilized for failure analysis. Combining EBIRCH with other techniques, such as SEM based nanoprobing system and PVC, allows not only direct electrical characterization of suspicious bridging sites but also allows engineers to pinpoint the exact location of defects with SEM resolution. This paper will demonstrate the several cases where SRAM-like test structures provided extreme challenges, and EBIRCH was the key technique towards finding the fail. A node to node, node to wordline, and ground-ground contact fails are presented. A combination of EBIRCH with the more traditional techniques in advanced technology node is key to timely and accurate determination of shorting mechanisms in our test structures.

Effective Absorber Area in Semispherical Solar Collectors With Spiral Cylindrical Absorber

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Carlos Armenta-Déu
Keyword(s):  
Solar Radiation ◽  
Solar Collector ◽  
Effective Area ◽  
Geometrical Parameters ◽  
Applied Physics ◽  
Master Thesis ◽  
New Generation ◽  
New Algorithms

This paper develops an advanced methodology to determine the real contribution of the incidence solar radiation components, direct, diffuse, and reflected, onto a semispherical solar collector with spirally rolled up cylindrical absorber, as a function of the intercepted area of the solar radiation components by the collector’s receiver. Based on a previous work (2012, Study and Characterization of New Generation Semispherical Thermal Collectors, Ana Sofía Morillo Candás, Applied Physics Master, Master Thesis, UCM) in which the effective intercepted area for direct radiation was modeled, the present paper develops new algorithms for diffuse and reflected solar radiation and improves the existing one, with the aim at characterizing geometrical parameters of these types of collectors. The determination of the effective area intercepted by the receiver for the different components of the solar radiation is essential for the characterization of the collector’s thermal performance, as the energy received by the absorber depends on the type of radiation and on the effective area covered by each type.

scholarly journals DETERMINATION OF MECHANICAL PROPERTIES OF COMPOSITE MATERIALS WITH DIFFERENT FILLERS POLYMER MATRIX

2021 ◽  
Vol 06 (02) ◽  
pp. 97-104
Author(s):  
Zaka Salimov Zaka Salimov ◽  
Matanat Jabiyeva Matanat Jabiyeva
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Epoxy Composite ◽  
Compression Tests ◽  
Prepared Composite ◽  
Carbon Fiber Epoxy

In this study, the preparation and characterization of carbon fiber reinforced epoxy composites are aimed at today's increasing use of composite materials. In this study, composite materials consisting of unidirectional carbon fiber-epoxy resin were prepared and the effects of fiber inclination angle on layered epoxy composite materials were investigated using various characterization techniques. Composite materials were prepared by autoclave method. At the stage of characterization of prepared composite materials Scanning electron microscopy (SEM) has been applied for tensile, compression tests and characterization of fracture surfaces to determine the mechanical properties. Keywords: Carbon fiber,epoxy resin,polymer composite,mechanical properties.

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

The Determination of Sense via Deleuze and Blanchot: Paradoxes of the Habitual, the Immemorial, and the Eternal Return

2008 ◽  
Vol 2 (2) ◽  
pp. 155-177 ◽  
Author(s):  
Eugene Brently Young
Keyword(s):  
Eternal Return

Eternal return is the paradox that accounts for the interplay between difference and repetition, a dynamic at the heart of Deleuze's philosophy, and Blanchot's approach to this paradox, even and especially through what it elides, further illuminates it. Deleuze draws on Blanchot's characterisations of difference, forgetting, and the unlivable to depict the ‘sense’ produced via eternal return, which, for Blanchot, is where repetition implicates or ‘carries’ pure difference. However, for Deleuze, difference and the unlivable are also developed by the living repetition or ‘contraction’ of habit, which results in his distinctive characterization of ‘force’, ‘levity’, and sense in eternal return.

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