The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Hope R. Mcgaha - One of the best experts on this subject based on the ideXlab platform.
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Color Variation Among Nestling Brown-Headed Cowbirds (Molothrus Ater) Does Not Reflect Differential Success With Hosts in Texas
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had young with yellow Flanges (81%, n = 16 spp.), yet Brown-headed Cowbirds with white Flanges were more common (61%, n = 107). Bronzed Cowbirds parasitized primarily species whose young had white Flanges (86%, n = 348 eggs). Despite the differential use of hosts with regard to flange color, the frequencies of each were similar among nestling and juvenile Brown-headed Cowbirds. Likewise, the frequencies of each color did not differ significantly between the sexes. Therefore, we suggest that a flange color matching that of nestmates is not strongly selected for by hosts. La Variación del Color entre Polluelos de Molothrus ater no Refleja Éxito Diferencial al Ser Criados por Especies Hospederas en Texas
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COLOR VARIATION AMONG NESTLING BROWN-HEADED COWBIRDS (MOLOTHRUS ATER) DOES NOT REFLECT DIFFERENTIAL SUCCESS WITH HOSTS IN TEXAS
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had yo...
Kevin Ellison - One of the best experts on this subject based on the ideXlab platform.
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Color Variation Among Nestling Brown-Headed Cowbirds (Molothrus Ater) Does Not Reflect Differential Success With Hosts in Texas
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had young with yellow Flanges (81%, n = 16 spp.), yet Brown-headed Cowbirds with white Flanges were more common (61%, n = 107). Bronzed Cowbirds parasitized primarily species whose young had white Flanges (86%, n = 348 eggs). Despite the differential use of hosts with regard to flange color, the frequencies of each were similar among nestling and juvenile Brown-headed Cowbirds. Likewise, the frequencies of each color did not differ significantly between the sexes. Therefore, we suggest that a flange color matching that of nestmates is not strongly selected for by hosts. La Variación del Color entre Polluelos de Molothrus ater no Refleja Éxito Diferencial al Ser Criados por Especies Hospederas en Texas
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COLOR VARIATION AMONG NESTLING BROWN-HEADED COWBIRDS (MOLOTHRUS ATER) DOES NOT REFLECT DIFFERENTIAL SUCCESS WITH HOSTS IN TEXAS
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had yo...
Karan Sotoodeh - One of the best experts on this subject based on the ideXlab platform.
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Wafer design valves verification based on ASME B16.34
SN Applied Sciences, 2019Co-Authors: Karan SotoodehAbstract:A flange connection is a very common method of valve attachment to the pipe. The flange is a ring-shaped device designed to be used as an alternative to welding or threading various piping components, including valves. A wafer design is defined as a flangeless design with facing that permits installation between American Society of Mechanical Engineers (ASME) and manufacturer standard (MSS SP) Flanges. One advantage of using a wafer design instead of a flanged end design is that smaller face-to-face dimensions save space, and the weight and cost of the valve are lower. This paper compares face-to-face wafer type valves and double flange butterfly valves in class 150 and size ranges between 4″ and 20″ designed according to American Petroleum Institute (API) 609. Using wafer type butterfly valves as per API 609 is very common in the oil and gas industry. However, it is not common to use a wafer type ball valve for saving weight and space. This paper reviews a case study of a wafer ball valve design, including the flange bolt holes inside the body and the closure. The criteria in the ASME B16.34 standard regarding the minimum allowable wall thickness of the valve were used to verify this design. Therefore, this case study can provide a good guideline for verifying the design of wafer type ball valves with the bolt holes inside the body, as per ASME B16.34 criteria.
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Wafer design valves verification based on ASME B16.34
SN Applied Sciences, 2019Co-Authors: Karan SotoodehAbstract:A flange connection is a very common method of valve attachment to the pipe. The flange is a ring-shaped device designed to be used as an alternative to welding or threading various piping components, including valves. A wafer design is defined as a flangeless design with facing that permits installation between American Society of Mechanical Engineers (ASME) and manufacturer standard (MSS SP) Flanges. One advantage of using a wafer design instead of a flanged end design is that smaller face-to-face dimensions save space, and the weight and cost of the valve are lower. This paper compares face-to-face wafer type valves and double flange butterfly valves in class 150 and size ranges between 4″ and 20″ designed according to American Petroleum Institute (API) 609. Using wafer type butterfly valves as per API 609 is very common in the oil and gas industry. However, it is not common to use a wafer type ball valve for saving weight and space. This paper reviews a case study of a wafer ball valve design, including the flange bolt holes inside the body and the closure. The criteria in the ASME B16.34 standard regarding the minimum allowable wall thickness of the valve were used to verify this design. Therefore, this case study can provide a good guideline for verifying the design of wafer type ball valves with the bolt holes inside the body, as per ASME B16.34 criteria.
Paul Jukes - One of the best experts on this subject based on the ideXlab platform.
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Use of Finite Element Analysis for Stud Pre-Tension Determination of Large Diameter Integral Flanges With Ring Joint Gaskets
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 5 Parts A and B, 2010Co-Authors: Upali Panapitiya, Syed Jafri, Haoyu Wang, Paul JukesAbstract:Large diameter integral steel Flanges are widely used in many applications in the oil and gas industry. The Flanges of nominal pipe sizes, 26-inch and above with ring-joint gaskets as specified in ASME B 16.47 Standard, are used in the offshore applications for the transportation of oil and gas from production facilities. These pipelines require flanged connections at end terminations, mid-line tie-ins and expansion loops. The conventional design of large diameter steel Flanges is based on one-dimensional analytical methods similar to the procedure in ASME VIII Boiler and Pressure Vessel Code, Division 1 Appendix 2. The effects of axial forces and bending moments are approximated by calculating an equivalent pressure. This usually results in conservative designs for the large Flanges because it estimates the required stud pre-tension based on the assumption that the gasket will be unloaded entirely to a minimum stress, whereas only a small section of the gasket is subjected to low stress. This technical paper presents the quasi-static, nonlinear, and three-dimensional finite element models of large diameter steel flanged joint for the determination of stud pre-tension and change of stud tension under various loading conditions. The finite element analysis results are compared with the results obtained by using the equivalent pressure method and flange “Joint Diagram”.© 2010 ASME
Spencer G. Sealy - One of the best experts on this subject based on the ideXlab platform.
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Color Variation Among Nestling Brown-Headed Cowbirds (Molothrus Ater) Does Not Reflect Differential Success With Hosts in Texas
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had young with yellow Flanges (81%, n = 16 spp.), yet Brown-headed Cowbirds with white Flanges were more common (61%, n = 107). Bronzed Cowbirds parasitized primarily species whose young had white Flanges (86%, n = 348 eggs). Despite the differential use of hosts with regard to flange color, the frequencies of each were similar among nestling and juvenile Brown-headed Cowbirds. Likewise, the frequencies of each color did not differ significantly between the sexes. Therefore, we suggest that a flange color matching that of nestmates is not strongly selected for by hosts. La Variación del Color entre Polluelos de Molothrus ater no Refleja Éxito Diferencial al Ser Criados por Especies Hospederas en Texas
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COLOR VARIATION AMONG NESTLING BROWN-HEADED COWBIRDS (MOLOTHRUS ATER) DOES NOT REFLECT DIFFERENTIAL SUCCESS WITH HOSTS IN TEXAS
The Auk, 2007Co-Authors: Kevin Ellison, Spencer G. Sealy, Hope R. McgahaAbstract:Abstract As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal Flanges among nestling Brown-headed Cowbirds may reflect differential success with different hosts on the basis of flange color. Moreover, because Brown-headed Cowbirds in the southern United States co-occur with Bronzed Cowbirds (M. aeneus), whose young have white Flanges, cowbird nestlings' flange colors may reflect a means for reducing interspecific competition through partitioning of host species on the basis of nestling flange color. To determine whether flange color influences cowbird fledging success with hosts of either color, we recorded the flange colors of cowbirds and their hosts at a site in Texas. We also tested whether flange color was influenced by nestling sex. Most hosts of Brown-headed Cowbirds had yo...
