A redescription of Atopacanthus dentatus Hussakof and Bryant, 1918 (Acanthodii, Ischnacanthidae)

The holotype specimen of the ischnacanthid acanthodian Alopacanthus dentatus comprises most of the posterior half of a dentigerous jaw bone, rather than a fragment from the middle of the jaw as was previously believed. A new diagnosis and revised description for the taxon are based on the holotype from the Rhinestreet Shale (Frasnian) and other specimens front the North Evans and Genundewa limestones (early Frasnian) of the Genesee Formation (late Givetian-early Frasnian); all of: these dentigerous jaw bones were collected near Hamburg, New York state, U.S.A. An emended diagnosis for Atopacanthus clarifies the differences between it and other ischnacanthid genera.

Influence of impact angles on penetration rates of CRAs exposed to a high velocity multiphase flow

A combined flow loop - jet impingement pilot plant has been used to determine mass loss rates in a mixed gas - saltwater - sand multiphase flow at impact velocities up to 70 m/s. Artificial brine with a salt content of 27 g/1 was used as liquid phase. Sand content, with grain size below 150 µ, was 2.7 g/l brine. CO at a pressure of 15 bar was used as gas phase. The impact angle between jet stream (nozzle) and sample surface was varied between 30 and 90°. Rectangular stainless steel disc samples with a size of 20 × 15 × 5 mm were used. They were mechanically ground and polished prior to testing. Damaged surfaces of specimens exposed to the high velocity multiphase flow were investigated by stereo microscopy, scanning electron microscopy (SEM) and an optical device for 3D surface measurements. Furthermore, samples were investigated by applying atomic force microscopy (AFM), magnetic force microscopy (MFM) and nanoindentation. Influence of impact velocity and impact angle on penetration rates (mass loss rates) of two CRAs (UNS S30400 and N08028) are presented. Moreover effects of chemical composition and mechanical properties are critically discussed. © 2008 by NACE International.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Anita Bryant at press conference with Anita's Pastor, Pastor Chapman and Bob Greene

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Anita Bryant and family attend service at Northwest Baptist Church

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Bella Abzug in Bryant Park for the First Women's March down Fifth Avenue

General note: Title and date provided by Bettye Lane.

Women's March down Fifth Avenue to Bryant Park

General note: Title and date provided by Bettye Lane.

Anita Bryant after Dade County voters defeated the Gay Rights Bill

General note: Title and date provided by Bettye Lane.