New materials and challenges in build‐up, RF and high speed applications – an overview

Circuit World ◽  
2003 ◽  
Vol 29 (4) ◽  
pp. 28-33 ◽  
Author(s):  
James Shang ◽  
Yung‐I Liu
Keyword(s):  
High Speed ◽  
New Materials

Improving the Efficiency of High-Speed AC Contact Suspension

2021 ◽  
Vol 5 (5) ◽  
pp. 39-43
Author(s):  
Maksim V. SHEVLYUGIN ◽  
◽  
Daria V. SEMENOVA ◽  
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Single Phase ◽  
New Technologies ◽  
Alternating Current ◽  
Rolling Stock ◽  
New Materials ◽  
High Speed Railway ◽  
Electric Rolling Stock ◽  
Electrified Railways

When developing a high-speed contact suspension for railways electrified with alternating current, it is important to ensure that the electric rolling stock passes the neutral insert without turning off the current and without reducing the speed of movement. The article provides an analysis of previously developed devices in the field of power supply of electrified railways of single-phase alternating current, in which an attempt was made to pass an electric rolling stock of a neutral insert without disconnecting the load. The device of isolating coupling of a catenary and a neutral insert for high-speed railway lines electrified on alternating current is described. In this case, the passage of the neutral insert is carried out under current and braking of the electric rolling stock will not occur. Among other things, to improve the efficiency of high-speed contact suspension for railways electrified with alternating current, it is proposed to use new materials and new technologies that can be used in the device of insulating coupling of the catenary

Photorefractive Polymers With High Speed

1999 ◽  
Vol 561 ◽  
Author(s):  
N. Peyghambarian ◽  
K. B. Ferrio ◽  
J. A. Herlocker ◽  
E. Hendrick ◽  
B. D. Guenther ◽  
...  
Keyword(s):  
Time Constant ◽  
High Speed ◽  
Response Rates ◽  
Rapid Progress ◽  
New Materials ◽  
Photorefractive Polymers ◽  
Recent Developments ◽  
Photorefractive Polymer ◽  
Grating Formation

ABSTRACTRapid progress in photorefractive polymers includes new materials with improved response rates. We briefly review recent developments in this rapidly evolving area and report grating formation with a 2-millisecond time-constant, the fastest reported to date in any photorefractive polymer.

Lightweight Research on Aluminum Alloy Material of Rear Axle Differential

2016 ◽  
Vol 723 ◽  
pp. 294-298 ◽  
Author(s):  
Jin Li Xu ◽  
Qiang He ◽  
Ding Jun Zhu
Keyword(s):  
Aluminum Alloy ◽  
Ductile Iron ◽  
Weight Reduction ◽  
High Speed ◽  
Rear Axle ◽  
New Materials ◽  
Iron Aluminum ◽  
Alloy Material ◽  
Differential Housing ◽  
Drive Axle

Aluminum and other materials are used more widely with the improvement of car’s weight reduction requirements and the high speed development of new materials. Differential housing is one of the important parts of automobiles drive axle, it is still heavy despite many optimization and improvement because that it is produced by ductile iron. Aluminum alloy material used in the differential housing are studied with FEA. The analysis results show that the weight is reduced by 60%, and a reference is provided for the lightweight of automobile.

A Comprehensive Approach to HEMT Reliability Testing

2009 ◽  
Vol 1195 ◽  
Author(s):  
David Cheney ◽  
Brent Gila ◽  
Erica Ann Douglas ◽  
Fan Ren ◽  
S. Pearton
Keyword(s):  
High Speed ◽  
Optical Pumping ◽  
Failure Mechanisms ◽  
Test System ◽  
Power Supplies ◽  
Stress Recovery ◽  
Reliability Testing ◽  
Temperature Step ◽  
New Materials ◽  
Commercial Off The Shelf

AbstractReliability testing often manifests device weaknesses and failure mechanisms. As new materials and structures are developed, creative and different testing is often necessary to determine reliability. We are developing an in-house reliability test system that will provide the necessary testing flexibility of HEMT devices so researchers can pinpoint defects and vulnerabilities. Using commercial off-the-shelf (COTS) power supplies and data acquisition equipment, a custom control system allows for many different tests: DC and RF, temperature, step/stress/recovery, high-speed pulse, and optical pumping, as well as combinations and automated sequencing of these tests. This flexibility allows for the creation of new test types as failure mechanisms are understood. The initial station will provide for the simultaneous, independent testing of 16 devices. This paper outlines the system design and capabilities, the motivation for the system, and some results from different tests.

scholarly journals Introduction. Carbon-based electronics: fundamentals and device applications

2007 ◽  
Vol 366 (1863) ◽  
pp. 189-193 ◽  
Author(s):  
Robin J Nicholas ◽  
Alison Mainwood ◽  
Laurence Eaves
Keyword(s):  
Carbon Nanotubes ◽  
Band Structure ◽  
Future Development ◽  
High Speed ◽  
The Novel ◽  
New Materials ◽  
New Science ◽  
Nanoscale Electronics ◽  
Device Applications ◽  
Carbon Based

Carbon-based materials offer a number of exciting possibilities for both new science and applications. Many of these are based on the novel band structure of graphene, by which solids mimic the properties of relativisitic fermions and which offers the potential for high speed nanoscale electronics. When sheets of graphene are rolled up to make carbon nanotubes, further interesting properties are found; for example, both semiconducting and metallic nanotubes able to be produced. The novel properties of these new materials, together with the already remarkable properties of diamond itself, are discussed by a series of experts who came together in May 2007 to discuss and debate the potential for future development.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

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