Experimental Studies of Excess Noise Sources in Concrete Based Materials as a Limiting Factor for Electromagnetic Emission Measurement

2013 ◽  
Vol 592-593 ◽  
pp. 529-532
Author(s):  
Robert Macků ◽  
Pavel Koktavý ◽  
Tomas Trčka ◽  
Vladimir Holcman
Keyword(s):  
Flicker Noise ◽  
Noise Analysis ◽  
Experimental Studies ◽  
Electromagnetic Emission ◽  
Dielectric Materials ◽  
Excess Noise ◽  
Limiting Factor ◽  
Emission Measurement ◽  
Noise Sources ◽  
Geometrical Properties

This paper deals with excess noise sources in dielectric materials. We focus especially on the concrete samples that are frequently tested to ensure information about the reliability and level of degradation. Nevertheless, the testing methods are limited mainly by the proper contact creation, signal detection and noise defined sensitivity. Our efforts are directed to the noise properties assessment. It turns out that the Johnson-Nyquist noise and the 1/f (flicker) noise are generated in the different regions with the different response to the internal or external electric field. In addition the noise analysis is affected by the internal polarization phenomena and the material residual humidity. This issue in connection with the sample geometrical properties and the dielectric noise measurement methodology take part in this paper.

Investigation of flicker-noise sources in a reflex klystron

1974 ◽  
Vol 17 (5) ◽  
pp. 569-578
Author(s):  
V. A. Berdnikova ◽  
S. A. Kornilov ◽  
S. D. Uman
Keyword(s):  
Flicker Noise ◽  
Noise Sources ◽  
Reflex Klystron

Via Cleaning Technology for Post Etch Residues

2005 ◽  
Vol 103-104 ◽  
pp. 357-360
Author(s):  
B.G. Sharma ◽  
Chris Prindle
Keyword(s):  
Semiconductor Industry ◽  
Dielectric Materials ◽  
Copper Interconnects ◽  
Limiting Factor ◽  
Device Performance ◽  
Semiconductor Technology ◽  
Widespread Acceptance ◽  
Cleaning Technology ◽  
Rc Delay ◽  
Low K

Interconnect RC delay is the limiting factor for device performance in submicron semiconductor technology. Copper and low-k dielectric materials can reduce this delay and have gained widespread acceptance in the semiconductor industry. The presence of copper interconnects provides unprecedented challenges for via cleaning technology and requires the development of novel process chemistries for improved device capability.

Exposure to industrial noise: impacts on cognitive performance

2021 ◽  
Vol 263 (4) ◽  
pp. 2590-2600
Author(s):  
Luiz Henrique Mesa Casa Pereira ◽  
Björn Knöfel ◽  
Jan Troge ◽  
Welf-Guntram Drossel ◽  
Marcel Klein ◽  
...  
Keyword(s):  
Cognitive Performance ◽  
Noise Analysis ◽  
Low Frequency ◽  
Cumulative Effect ◽  
Noise Sources ◽  
Industrial Noise ◽  
Sound Levels ◽  
Office Environments ◽  
High Sound ◽  
High Frequency Content

Research on the relation between exposure to noise and cognitive performance inside industrial environments is not as broad as on office environments. For a better understanding of the specific industrial noise problems, participants performed arithmetic tests inside a hemi anechoic room while they were exposed to sounds of five typical industrial noise sources. The subjects also classified how annoying they perceived the noise signals. The effect of noise on the arithmetic test's performance was larger on accuracy than on velocity, which was verified using a Student t-test. Spectral-temporal characteristics - especially high frequency content and strong low frequency modulation - appear to relate better with lower performance on the test than high sound levels. Subjects that evaluated noise as more annoying performed worse in a final arithmetic test (under silence) after being exposed to the noises, indicating a possible cumulative effect of noise on performance. The findings provide a better insight in the cognitive behavior of people who are exposed to industrial noise. Hence, the study will proceed with the specific noise analysis of single industrial workplaces.

Flicker Noise Analysis of Non-uniform Body TFET with Dual Material Source (NUTFET-DMS)

2021 ◽  
pp. 247-253
Author(s):  
Jagritee Talukdar ◽  
G. Amarnath ◽  
Kavicharan Mummaneni
Keyword(s):  
Flicker Noise ◽  
Noise Analysis ◽  
Material Source ◽  
Dual Material

Evaluation of Properties of Constructed Tubular-Steel Cast-in-Place Pilings

2013 ◽  
Vol 2363 (1) ◽  
pp. 36-46
Author(s):  
Devin K. Harris ◽  
Amir Gheitasi ◽  
Theresa M. Ahlborn ◽  
Kevin A. Mears
Keyword(s):  
Compressive Strength ◽  
Experimental Studies ◽  
Ground Surface ◽  
Axial Loading ◽  
Steel Shell ◽  
Deep Foundations ◽  
Element Analysis ◽  
Concrete Core ◽  
Geometrical Properties ◽  
Wisconsin Department

Bridge foundations contribute significantly to the serviceability and efficiency of in-service transportation networks. Foundation failure may lead to catastrophic failure of the entire structure, which in turn results in system failure, loss of life, and detours. When the soil within ground surface layers fails to satisfy the bearing capacity requirements, deep foundations such as tubular-steel concrete-filled piles are commonly used in practice. A challenge that often exists with these systems is the uncertainty surrounding in-service capacity as well as condition, which is difficult to determine from the surface. As a consequence, transportation agencies such as the Wisconsin Department of Transportation use conservative approaches, such as neglecting the tubular-steel contribution or bounding the compressive strength of the core concrete, to design these systems. This approach, while effective for safety, can yield overly conservative and costly designs. The main purpose of this investigation was to evaluate the behavior of tubular-steel, concrete-filled, cast-in-place pilings, with a concentration on the compressive strength and composite behavior between concrete core and steel shell. In this regard, a series of experimental studies, including composite and noncomposite compression loading, core samples, push-through, and flexural testing together with a compatible finite element analysis, were conducted on a series of field-cast piles with different geometrical properties. The results indicated that the steel shell made a significant contribution to the axial loading capacity of the cast-in-place piles. Moreover, no evidence of bond loss was observed during the corresponding experimental studies.

A New Method of Relating Airflow Measurements of Fineness and Maturity to the Geometrical Properties of the Cotton Fiber

1976 ◽  
Vol 46 (11) ◽  
pp. 835-841 ◽  
Author(s):  
S. G. Stephens
Keyword(s):  
Lactic Acid ◽  
Cotton Fiber ◽  
Isopropyl Alcohol ◽  
Experimental Studies ◽  
New Method ◽  
Fiber Types ◽  
Geometrical Properties ◽  
Wide Range ◽  
Fiber Dimensions ◽  
Coiled Fiber

A new method of estimating cotton fiber dimensions is developed, based on the geometrical properties of a loosely-coiled fiber. The theoretical principles are supported by experimental studies based on actual microscopic measurements of a wide range of cotton fiber types. The procedure involved cutting short segments ( ca. 2 mm) from the midregions of the fibers and mounting them in minimal amounts of a suitable clearing/mounting medium (3 parts 85% lactic acid: 1 part isopropyl alcohol). Fibers so prepared can be measured more accurately then dry fibers, although the mounting medium induces a slight swelling of the fiber walls.

scholarly journals Cellular mechanisms underlying steroid-resistant asthma

2019 ◽  
Vol 28 (153) ◽  
pp. 190096 ◽  
Author(s):  
Ridhima Wadhwa ◽  
Kamal Dua ◽  
Ian M. Adcock ◽  
Jay C. Horvat ◽  
Richard Y. Kim ◽  
...  
Keyword(s):  
Respiratory Infections ◽  
Experimental Studies ◽  
Therapeutic Targets ◽  
Experimental Models ◽  
Limiting Factor ◽  
Cellular Mechanisms ◽  
Steroid Resistant ◽  
Histone Deacetylase 2 ◽  
Phosphoinositide 3 Kinase ◽  
Inflammatory Phenotypes

Severe steroid-resistant asthma is clinically important, as patients with this form of the disease do not respond to mainstay corticosteroid therapies. The heterogeneity of this form of asthma and poor understanding of the pathological mechanisms involved hinder the identification of therapeutic targets and the development of more effective therapies. A major limiting factor in the understanding of severe steroid-resistant asthma is the existence of multiple endotypes represented by different immunological and inflammatory phenotypes, particularly in adults. Several clinical and experimental studies have revealed associations between specific respiratory infections and steroid-resistant asthma in adults. Here, we discuss recent findings from other authors as well as our own studies that have developed novel experimental models for interrogating the association between respiratory infections and severe steroid-resistant asthma. These models have enabled the identification of new therapies using macrolides, as well as several novel disease mechanisms, including the microRNA-21/phosphoinositide 3-kinase/histone deacetylase 2 axis and NLRP3 inflammasomes, and highlight the potential of these mechanisms as therapeutic targets.

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