18 research outputs found
The Micro-Arcsecond Scintillation-Induced Variability (Masiv) Survey. III. Optical Identifications and New Redshifts
Intraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat spectrum sources revealed that the IDV is related to the radio flux density and redshift. A study of the physical properties of these sources has been severely handicapped by the absence of reliable redshift measurements for many of these objects. This paper presents 79 new redshifts and a critical evaluation of 233 redshifts obtained from the literature. We classify spectroscopic identifications based on emission line properties, finding that 78% of the sources have broad emission lines and are mainly FSRQs. About 16% are weak lined objects, chiefly BL Lacs, and the remaining 6% are narrow line objects. The gross properties (redshift, spectroscopic class) of the MASIV sample are similar to those of other blazar surveys. However, the extreme compactness implied by ISS favors FSRQs and BL Lacs in the MASIV sample as these are the most compact object classes. We confirm that the level of IDV depends on the 5 GHz flux density for all optical spectral types. We find that BL Lac objects tend to be more variable than broad line quasars. The level of ISS decreases substantially above a redshift of about two. The decrease is found to be generally consistent with ISS expected for beamed emission from a jet that is limited to a fixed maximum brightness temperature in the source rest frame
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358FinalReportSp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358PosterSp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358Poster2Sp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358FinalPresentationSp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358ProjectPlanSp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable
Delta Hook Technology (Semester Unknown) EnPRO 358: DHTEnPRO358MidTermPresentationSp10
Recreational fishing is a sizable market, generating over a billion dollars of economic output and providing well over a million American’s with jobs. There are many variations of fishing hooks available that retain the same basic shape and structure, the most popular examples being, the standard J-hook, treble hook and the new “Trokar”, which is “surgically sharpened”. However, there are many limitations associated with existing fishing hooks. One such limitation is that fishing hooks are not able to reliably hold the fish after embedding. Introducing a barb to the hook usually solves this issue, doing so however creates problems when setting the hook and furthermore, barbs can cause damage to the fish during the removal process. Another concern is that contemporary fishing hooks have problems with snagging on nearby rock formations, algae, weeds, or other vegetation in the water.Sponsorship: DHTDeliverable