Octave-Band Double-Balanced Integrated Finline Mixers at mm-Wavelengths

Knoechel, R.; Schlegel, Anton

doi:10.1109/euma.1980.332789

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…They are nos. 43, 129 (B1.5 Vpne;Schild 1970), 171 (B2 IVne;Knoechel 1980), 180, and 187. Our photometry detected seven additional Be star candidates (nos.…”

Section: Discussionmentioning

confidence: 99%

The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters

McSwain

Gies

2005

ASTROPHYS J SUPPL S

179

238

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Be stars are a class of rapidly rotating B stars with circumstellar disks that cause Balmer and other line emission. There are three possible reasons for the rapid rotation of Be stars: they may have been born as rapid rotators, spun up by binary mass transfer, or spun up during the main-sequence (MS) evolution of B stars. To test the various formation scenarios, we have conducted a photometric survey of 55 open clusters in the southern sky. Of these, five clusters are probably not physically associated groups and our results for two other clusters are not reliable, but we identify 52 definite Be stars and an additional 129 Be candidates in the remaining clusters. We use our results to examine the age and evolutionary dependence of the Be phenomenon. We find an overall increase in the fraction of Be stars with age until 100 Myr, and Be stars are most common among the brightest, most massive B-type stars above the zero-age main sequence (ZAMS). We show that a spin-up phase at the terminal-age main sequence (TAMS) cannot produce the observed distribution of Be stars, but up to 73% of the Be stars detected may have been spun-up by binary mass transfer. Most of the remaining Be stars were likely rapid rotators at birth. Previous studies have suggested that low metallicity and high cluster density may also favor Be star formation. Our results indicate a possible increase in the fraction of Be stars with increasing cluster distance from the Galactic center (in environments of decreasing metallicity). However, the trend is not significant and could be ruled out due to the intrinsic scatter in our data. We also find no relationship between the fraction of Be stars and cluster density. Subject headingg s: open clusters and associations: individual

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“…They are nos. 43, 129 (B1.5 Vpne;Schild 1970), 171 (B2 IVne;Knoechel 1980), 180, and 187. Our photometry detected seven additional Be star candidates (nos.…”

Section: Discussionmentioning

confidence: 99%

The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters

McSwain

Gies

2005

ASTROPHYS J SUPPL S

179

238

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“…The idea of bilateral finline balun has been advanced by Knoechel and Schlegel [1]. Such a structure, when used with another balun ending with suspended symmetrical strips, offers two great advantages over other balun types: high isolation due to mutually orthogonal electromagnetic field patterns in the involved transmission lines and planar mounting of beamlead diodes without the need of using cross-over connections.…”

Section: Introductionmentioning

confidence: 99%

“…For present-day devices having plug-and-play capabilities, the wired universal serial bus (USB) dongles [1] are the most popular and accessible pocket devices for users. With a growing demand for high-speed connectivity among consumer electronics or computer-associated devices on the short-range wireless personal area network (WPAN) [2], Wireless USB Promoter Group [3] has proposed some wireless USB application in dongles combined with ultra-wideband (UWB) wireless technologies to give users the freedom to wirelessly connect to printers, cameras, and many other peripherals.…”

Section: Introductionmentioning

confidence: 99%

A novel compact broadband 5–35 GHz balun

Chramiec

Janiczak

Kitliński

2007

Micro & Optical Tech Letters

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In this study, we investigated the yield and physicochemical properties of the high molecular weight extracellular polymeric substance (HMW–EPS) produced by Halomonas sp. strain TG39 when grown on different types and ratios of substrates. Glucose (1% w/v) and a peptone/yeast extract ratio of 5.1 (0.6% w/v final concentration) yielded an EPS fraction (HMW‐glucose) exhibiting the highest anionic activity (20.5) and specific emulsifying activity (EI24 = 100%) compared to EPS produced by cells grown on mannitol, sucrose, malt extract or no carbon source. The HMW–EPS fractions were capable of binding ≈255–464 mg of methylene blue (MB) per gram of EPS, which represents the highest reported binding of MB by a bacterial EPS. A comparative evaluation of these properties to those of commercial hydrocolloids indicated that the combined effect of protein and anionic residues of the HMW–EPS contributed to its ability to emulsify n‐hexadecane. Liquid chromatography revealed the HMW‐glucose EPS to be a heterogeneous polymer with a polydispersity index of 1.8. This work presents evidence of a correlation between the anionic nature and protein content of bacterial EPS with its emulsifying qualities, and identifies EPS produced by strain TG39 as a high MB‐binding bacterial sorbant with potential biotechnological application. Biotechnol. Bioeng. 2009;103: 207–216. © 2008 Wiley Periodicals, Inc.

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Eigenschaften und Dimensionierung von Koaxialkabeln, Streifenleitungen, Finleitungen, Richtkopplern und Hochfrequenzfiltern

Zinke

Brunswig

1995

Hochfrequenztechnik 1

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Octave-Band Double-Balanced Integrated Finline Mixers at mm-Wavelengths

Cited by 4 publications

References 5 publications

The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters

The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters

A novel compact broadband 5–35 GHz balun

Eigenschaften und Dimensionierung von Koaxialkabeln, Streifenleitungen, Finleitungen, Richtkopplern und Hochfrequenzfiltern

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