Experimental Techniques in Fracture Characterization

2007 ◽  
Vol 567-568 ◽  
pp. 39-44
Author(s):  
W. R. Tyson
Keyword(s):  
Fracture Toughness ◽  
State Of The Art ◽  
Research Trends ◽  
The State ◽  
Experimental Techniques ◽  
Fracture Characterization ◽  
Girth Welds ◽  
Linepipe Steel

Characterization of fracture toughness is discussed in relation to specification of steels for northern pipelines. The state of the art and research trends in measurement of CTOD for girth welds and CTOA for linepipe steel are described.

Host–Based Intrusion Detection Systems

2014 ◽  
pp. 184-213
Author(s):  
Vít Bukač ◽  
Vashek Matyáš
Keyword(s):  
Intrusion Detection ◽  
Detection Method ◽  
State Of The Art ◽  
Research Trends ◽  
The State ◽  
Intrusion Detection Systems ◽  
Future Directions ◽  
Detection Systems ◽  
Research Findings ◽  
Art Research

In this chapter, the reader explores both the founding ideas and the state-of-the-art research on host-based intrusion detection systems. HIDSs are categorized by their intrusion detection method. Each category is thoroughly investigated, and its limitations and benefits are discussed. Seminal research findings and ideas are presented and supplied with comments. Separate sections are devoted to the protection against tampering and to the HIDS evasion techniques that are employed by attackers. Existing research trends are highlighted, and possible future directions are suggested.

scholarly journals Principles and Applications of Ceramic Humidity Sensors

1994 ◽  
Vol 16 (2) ◽  
pp. 69-87 ◽  
Author(s):  
Mario Pelino ◽  
Carlo Cantalini ◽  
Marco Faccio
Keyword(s):  
Impedance Spectroscopy ◽  
Relative Humidity ◽  
Response Time ◽  
State Of The Art ◽  
The State ◽  
Experimental Techniques ◽  
Humidity Sensors ◽  
Temperature Range ◽  
Si Doped ◽  
Signal Response

This paper presents a brief review of the state of the art in humidity and gas ceramic sensors R&D; it also describes the principle, fabrication and application of the humidity-sensitive Si-doped a-hematite (α-Fe2O3) sintered compacts. The humidity signal response is characterized by volt-amperometric and impedance spectroscopy techniques in the 0-97% relative humidity (RH) range. The response time of the sensor is evaluated by 0-60% RH variations. Experimental techniques used to measure the hysteresis, drift, and aging of the humidity setasor are presented and the results are discussed. The CO sensitivity is investigated by activating the sensor in the 350-450℃ temperature range. A humidity-meter prototype, based on the α-Fe2O3ceramic compact is described, and its electronics and features are presented in this paper.

Fracture Characterization of TiAl Matrix Composites by Addition of Fluoride Solid Lubricants

2010 ◽  
Vol 123-125 ◽  
pp. 97-100 ◽  
Author(s):  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Yan Jun Wang ◽  
Bo Zhu ◽  
Lin Hou
Keyword(s):  
Fracture Toughness ◽  
Solid Lubricant ◽  
Solid Lubricants ◽  
Downward Trend ◽  
Matrix Composites ◽  
Fracture Characterization ◽  
Maximum Value ◽  
Different Content

The fracture characterization of Ti–48Al–2Nb-2Cr composites (TANC) with addition of different weight contents of fluoride solid lubricants (LiF, NaF, CaF2 and 38%CaF2-62%BaF2 eutectic solid lubricant (BC) ) were evaluated in the paper. The fracture toughness of composites with different content of fluoride solid lubricants is discussed. The TANC composites with 0-5 wt.% solid lubricant exhibit higher fracture toughness. It can be seen that additions of all fluoride solid lubricants to TANC matrix result in decrease in fracture toughness expect for additions of 5% of that. By adding 5 wt.% BC the fracture toughness of the TANC composites exhibited a maximum value of 12.2MPa m1/2; by addition of 5%CaF2, 11.4 MPa m1/2; 5%LiF, 10.8 MPa m1/2 while 5%NaF, 11.1 MPa m1/2. However, with further increasing of fluoride solid lubricants contents it showed a downward trend. By adding 20 wt.% BC the fracture toughness of the TANC composites exhibited a maximum value of 8.6 MPa m1/2; by addition of 20%CaF2, 8.1 MPa m1/2; 20%LiF, 8.3 MPa m1/2 while 5%NaF, 7.9 MPa m1/2.

scholarly journals Design of 300 GHz Combined Doubler/Subharmonic Mixer Based on Schottky Diodes with Integrated MMIC Based Local Oscillator

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2112
Author(s):  
José M. Pérez-Escudero ◽  
Carlos Quemada ◽  
Ramón Gonzalo ◽  
Iñigo Ederra
Keyword(s):  
State Of The Art ◽  
Schottky Diodes ◽  
Noise Temperature ◽  
Local Oscillator ◽  
The State ◽  
Experimental Characterization ◽  
Conversion Loss ◽  
Equivalent Noise Temperature ◽  
Factor Technique

In this paper the design and experimental characterization of a combined doubler-subharmonic mixer based on Schottky diodes which uses a 75 GHz MMIC based local oscillator is presented. This solution integrates in the same substrate the doubler and the mixer, which share the same metallic packaging with the local oscillator. The prototype has been fabricated and measured. For characterization, the Y-Factor technique has been used and the prototype yields a best conversion loss and equivalent noise temperature of 11 dB and 1976 K, respectively, at 305 GHz. This performance is close to the state of the art, and shows the potential of this approach, which allows a significant reduction in terms of size and volume.

Fracture Characterization of High Density Polyethylene/Organoclay Nanocomposites Toughened with SEBS-g-MA

2006 ◽  
Vol 312 ◽  
pp. 187-192 ◽  
Author(s):  
S.P. Bao ◽  
Sie Chin Tjong
Keyword(s):  
Fracture Toughness ◽  
High Density Polyethylene ◽  
High Density ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Fracture Characterization ◽  
X Ray ◽  
Melt Compounding ◽  
Work Of Fracture

High density polyethylene (HDPE)/organoclay nanocomposites toughened with maleated styrene-ethylene-butylene-styrene elastomer (SEBS-g-MA) were prepared by melt compounding. The structure and mechanical properties of such nanocomposites were investigated by X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), tensile and impact techiniques. XRD measurements showed that meleic anhydride group of SEBS elastomer was beneficial in forming an intercalated or partially exfoliated structure. The essential work of fracture (EWF) approach under tensile condition was used to characterize the fracture toughness of nanocomposites. The results indicated that the addition of SEBS-g-MA to the HDPE/organoclay nanocomposites greatly enhanced their fracture toughness.

Characterization Study of Al-Plug Technology

1991 ◽  
Vol 225 ◽  
Author(s):  
H. H. Hoang ◽  
F. S. Chen ◽  
T. E. Turner ◽  
Y. S. Lin ◽  
G. A. Dixit ◽  
...  
Keyword(s):  
State Of The Art ◽  
Electrical Characterization ◽  
The State ◽  
Complete Elimination ◽  
Complete Filling ◽  
Step Coverage ◽  
Characterization Study ◽  
Coverage Problems

ABSTRACTThis work investigates the reliability issues associated with an aluminum sputter process, called the Al-plug process, that results in the complete filling of submicron contacts and vias of various sizes. The state-of-the-art Al-plug technology has proven its superiority over conventional processes due to its process simplicity and complete elimination of metal step-coverage problems and dielectric voiding over contacts/vias, resulting in higher reliability. Materials and electrical characterization of this metal process are presented.

scholarly journals An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2782
Author(s):  
Konstantinos D. Paschaloudis ◽  
Constantinos L. Zekios ◽  
Georgios C. Trichopoulos ◽  
Filippos Farmakis ◽  
George A. Kyriacou
Keyword(s):  
Penetration Depth ◽  
Patch Antenna ◽  
State Of The Art ◽  
The State ◽  
Antenna Design ◽  
Surface Currents ◽  
Rectangular Patch ◽  
Full Wave ◽  
Volume Currents

In this work, we present a rigorous full-wave eigenanalysis for the study of nanoantennas operating at both terahertz (THz) (0.1–10 THz), and infrared/optical (10–750 THz) frequency spectrums. The key idea behind this effort is to reveal the physical characteristics of nanoantennas such that we can transfer and apply the state-of-the-art antenna design methodologies from microwaves to terahertz and optics. Extensive attention is given to penetration depth in metals to reveal whether the surface currents are sufficient for the correct characterization of nanoantennas, or the involvement of volume currents is needed. As we show with our analysis, the penetration depth constantly reduces until the region of 200 THz; beyond this point, it shoots up, requiring volume currents for the exact characterization of the corresponding radiating structures. The cases of a terahertz rectangular patch antenna and a plasmonic nanoantenna are modeled, showing in each case the need of surface and volume currents, respectively, for the antenna’s efficient characterization.

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