scholarly journals Luminescence Dates from the Tuinier Farm Site (41HP237), Hopkins County, Texas

2011 ◽  
Author(s):  
Timothy K. Perttula ◽  
James K. Feathers
Keyword(s):  
North America ◽  
Small Sample ◽  
Luminescence Dating ◽  
East Texas ◽  
Target Event ◽  
Considerable Success ◽  
A Site

The luminescence dating of ceramics has been applied with some considerable success in a variety of settings—and on different ceramic wares—in North America, but since the days of Alpha Analytic (a subsidiary of Beta Analytic) in the early to mid-1980s, there have been no luminescence dating of Caddo ceramic wares in Northeast or East Texas. Given the abundance of ceramics of several different kinds and styles at all Caddo sites, the luminescence dating of both plain and decorated sherds recovered in situ from these many sites should be explored since it is a method “that dates the manufacture and use of…ceramic objects [that] provide a closer relationship between the target event [when a site is occupied] and the dated event [the age determined by the luminescence on a sherd]. Luminescence is particularly well suited for the dating of ceramics since the method measures the time elapsed since vessels were last heated, usually corresponding to manufacture or use." In this article, we discuss the results of recent luminescence dating on a small sample of Caddo ceramic sherds at the Tuinier Farm site (41HP237).

scholarly journals Development of Fragility Curves for Piping and Slope Stability of River Levees

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 738
Author(s):  
Nicola Rossi ◽  
Mario Bačić ◽  
Meho Saša Kovačević ◽  
Lovorka Librić
Keyword(s):  
Slope Stability ◽  
Fragility Curves ◽  
Safety Margin ◽  
Water Levels ◽  
Flood Event ◽  
Soil Parameters ◽  
Design Code ◽  
A Site ◽  
Insight Into

The design code Eurocode 7 relies on semi-probabilistic calculation procedures, through utilization of the soil parameters obtained by in situ and laboratory tests, or by the means of transformation models. To reach a prescribed safety margin, the inherent soil parameter variability is accounted for through the application of partial factors to either soil parameters directly or to the resistance. However, considering several sources of geotechnical uncertainty, including the inherent soil variability, measurement error and transformation uncertainty, full probabilistic analyses should be implemented to directly consider the site-specific variability. This paper presents the procedure of developing fragility curves for levee slope stability and piping as failure mechanisms that lead to larger breaches, where a direct influence of the flood event intensity on the probability of failure is calculated. A range of fragility curve sets is presented, considering the variability of levee material properties and varying durations of the flood event, thus providing crucial insight into the vulnerability of the levee exposed to rising water levels. The procedure is applied to the River Drava levee, a site which has shown a continuous trend of increased water levels in recent years.

scholarly journals Serous Tubal Intraepithelial Carcinoma or Not? Metastases to Fallopian Tube Mucosa Can Masquerade as In Situ Lesions

2017 ◽  
Vol 141 (10) ◽  
pp. 1313-1315 ◽  
Author(s):  
Reena Singh ◽  
Kathleen R. Cho
Keyword(s):  
Fallopian Tube ◽  
De Novo ◽  
Data Sources ◽  
High Grade ◽  
Serous Tubal Intraepithelial Carcinoma ◽  
Different Types ◽  
Intraepithelial Carcinoma ◽  
A Site ◽  
Immunohistochemical Stains

Context.— Nonuterine high-grade serous carcinomas (HGSCs) are believed to arise most often from precursors in the fallopian tube referred to as serous tubal intraepithelial carcinomas (STICs). A designation of tubal origin has been suggested for all cases of nonuterine HGSC if a STIC is identified. Objective.— To highlight that many different types of nongynecologic and gynecologic carcinomas, including HGSC, can metastasize to the tubal mucosa and mimic de novo STIC. Data Sources.— A mini-review of several recently published studies that collectively examine STIC-like lesions of the fallopian tube. Conclusions.— The fallopian tube mucosa can be a site of metastasis from carcinomas arising elsewhere, and pathologists should exercise caution in diagnosing STIC without first considering the possibility of metastasis. Routinely used immunohistochemical stains can often be used to determine if a STIC-like lesion is tubal or nongynecologic in origin. In the context of uterine and nonuterine HGSC, STIC may represent a metastasis rather than the site of origin, particularly when widespread disease is present.

Excavation Sample Size: A Cautionary Tale

1993 ◽  
Vol 58 (3) ◽  
pp. 523-529 ◽  
Author(s):  
Dennis H. O'Neil
Keyword(s):  
Cultural Resource Management ◽  
Small Sample ◽  
Sampling Strategies ◽  
Cautionary Tale ◽  
Complete Understanding ◽  
Cultural Resource ◽  
Sampling Fraction ◽  
Small Sample Sizes ◽  
A Site ◽  
Management Work

Frequently, only five percent or less of a midden site is excavated for environmental-analysis purposes before it is turned over to the bulldozers for destruction. Such exceptionally small sample sizes have become accepted in cultural-resource-management work as adequate for gaining a good understanding of the chronology and cultural activities at a site. This assumption was tested by the author with a 63 percent excavation sampling fraction from a southern California midden. The data indicate that a far-from-complete understanding of a site may result from small sampling fractions and that more carefully designed sampling strategies and statistical manipulation of the data may not overcome this problem.

scholarly journals Exploring the Utility of Compound-Specific Isotope Analysis for Assessing Ferrous Iron-Mediated Reduction of RDX in the Subsurface

2020 ◽  
Author(s):  
Yiran Tong ◽  
Matthew J. Berens ◽  
Bridget A. Ulrich ◽  
Jakov Bolotin ◽  
Jennifer H. Strehlau ◽  
...  
Keyword(s):  
Groundwater Contamination ◽  
Ferrous Iron ◽  
Chemical Reduction ◽  
Isotope Analysis ◽  
Enrichment Factors ◽  
Isotope Enrichment ◽  
Compound Specific Isotope Analysis ◽  
A Site ◽  
Mediated Reduction

This work determines isotope enrichment factors for RDX during reduction by iron minerals. The values determined are used to assess the transformation of RDX at a site with groundwater contamination and in laboratory column reactors simulating in situ chemical reduction treatment.

Geographic Patterns of Interspecific Hybridization between Spotted Knapweed (Centaurea stoebe) and Diffuse Knapweed (C. diffusa)

2009 ◽  
Vol 2 (1) ◽  
pp. 55-69 ◽  
Author(s):  
Amy C. Blair ◽  
Ruth A. Hufbauer
Keyword(s):  
North America ◽  
North American ◽  
Management Strategies ◽  
Spotted Knapweed ◽  
The North ◽  
Hybrid Swarms ◽  
Hybrid Plants ◽  
Introduced Range ◽  
Diffuse Knapweed ◽  
A Site

AbstractHybridization between species has the potential to change invasion dynamics. Field observations suggest that spotted knapweed and diffuse knapweed, two ecologically and economically destructive invasive plants, hybridize in their introduced range. As a first step towards understanding whether hybridization has affected the dynamics of the invasion of these species, we conducted field surveys in the introduced (North American) and native (European) ranges to discern patterns of hybridization and measured fitness-related traits among field hybrids and parental species. In North America we detected plants with hybrid morphology in 97% of the diffuse knapweed sites (n= 40); such hybrid plants were taller and more often exhibited polycarpy than plants with typical diffuse knapweed morphology. Hybrids were not detected in North American spotted knapweed sites (n= 22). In most regions surveyed in Europe, diffuse knapweed and spotted knapweed were isolated from each other and existed as distinct, nonhybridizing species. However, in Ukraine, the two species frequently coexisted within a site, resulting in hybrid swarms. On average, the plants from the North American diffuse knapweed sites (including plants with both diffuse and hybrid morphology), were larger than the apparently pure diffuse knapweed in the native range. The cross-continental patterns of hybridization likely are explained by differences in cytology. It recently has been confirmed that the spotted knapweed in North America is tetraploid whereas the diffuse knapweed is diploid. Genetic incompatibilities associated with these two cytotypes likely prevent ongoing hybridization. We hypothesize that hybrid individuals were introduced to North America along with diffuse knapweed. Because plants with hybrid morphology are found in nearly all North American diffuse knapweed sites, the introduction of hybrids likely occurred early in the invasion of diffuse knapweed. Thus, although the presence of hybrids might facilitate the ongoing invasion of diffuse knapweed into North America, elevated concern regarding their presence might not be warranted. Because such individuals are not likely to represent a new hybridization event, currently effective management strategies used in diffuse knapweed sites should not need alteration.

The first North American record of Carinodens belgicus (Squamata, Mosasauridae) and correlation with the youngest in situ examples from the Maastrichtian type area: palaeoecological implications

2013 ◽  
Vol 92 (2-3) ◽  
pp. 145-152 ◽  
Author(s):  
E.W.A. Mulder ◽  
P. Formanoy ◽  
W.B. Gallagher ◽  
J.W.M. Jagt ◽  
A.S. Schulp
Keyword(s):  
North America ◽  
Atlantic Ocean ◽  
North American ◽  
Atlantic Coast ◽  
First Record ◽  
Type Area

AbstractFour recently collected tooth crowns of the rare latest Cretaceous (late Maastrichtian) durophagous mosasaur Carinodens belgicus are discussed; the first record from the Atlantic coast of North America (Maryland), and three additional in situ examples from the Maastrichtian type area in the southeast Netherlands and northeast Belgium. Also presented are an updated overview of the material recorded to date, and a discussion of the palaeobiogeographical and palaeoenvironmental distribution of the genus. Towards the end of the Cretaceous, Carinodens appears to have been successful in exploiting the margins of both the proto-Atlantic Ocean and the Tethyan Realm.

scholarly journals Benthic nutrient fluxes and sediment oxygen consumption in a full-scale facultative pond in Patagonia, Argentina

2013 ◽  
Vol 68 (8) ◽  
pp. 1770-1777 ◽  
Author(s):  
M. Faleschini ◽  
J. L. Esteves
Keyword(s):  
Oxygen Consumption ◽  
Advanced Degree ◽  
Benthic Fluxes ◽  
Temperate Region ◽  
Benthic Metabolism ◽  
Mineralization Of Organic Matter ◽  
A Site ◽  
Water Bottom ◽  
Raw Wastewater

The study of benthic metabolism is an interesting tool to understand the process that occurs in bottom water at wastewater stabilization ponds. Here, rates of benthic oxygen consumption and nutrient exchange across the water–sludge interface were measured in situ using a benthic chamber. The research was carried out during autumn, winter, and summer at a municipal facultative stabilization pond working in a temperate region (Puerto Madryn city, Argentina). Both a site near the raw wastewater inlet (Inlet station) and a site near the outlet (Outlet station) were sampled. Important seasonal and spatial patterns were identified as being related to benthic fluxes. Ammonium release ranged from undetectable (autumn/summer – Inlet station) to +30.7 kg-NH4+ ha−1 d−1 (autumn – Outlet station), denitrification ranged from undetectable (winter – in both sites) to −4.0 kg-NO3− ha−1 d−1 (autumn – Outlet station), and oxygen consumption ranged from 0.07 kg-O2ha−1 d−1 (autumn/summer – Outlet station) to 0.84 kg-O2ha−1 d−1 (autumn – Inlet station). During the warmer months, the mineralization of organic matter from the bottom pond acts as a source of nutrients, which seem to support the important development of phytoplankton and nitrification activity recorded in the surface water. Bottom processes could be related to the advanced degree and efficiency of the treatment, the temperature, and probably the strong and frequent wind present in the region.

scholarly journals 41SM32 on Little Saline Creek in Smith County, Texas

2015 ◽  
Author(s):  
Timothy K. Perttula ◽  
Mark Thaker
Keyword(s):  
Archaeological Site ◽  
Network Member ◽  
East Texas ◽  
University Of Texas ◽  
The North ◽  
Post Oak ◽  
A Site ◽  
The University ◽  
The City ◽  
Smith County

A review of early trinomial numbers for sites located in Smith County in East Texas indicated that between 1938 and 1943 Jack Hughes identified and collected from at least 37 sites listed on the Texas Historic Site Atlas. From 1938 to 1941 his site locations randomly occur throughout the County; interestingly there are no sites recorded in 1942. In 1943 he recorded about 14 sites along Black Fork Creek and its tributaries, this being mostly west of the City of Tyler. The primary purpose in reviewing the available archaeological information about these early recorded sites was to re-visit selected sites if necessary and to update information that was recorded beginning almost 80 years ago. An entry contained on a Texas Archeological Research Laboratory at The University of Texas (TARL) site card indicated that Hughes collected artifacts from a site (41SM32) located on Little Saline Creek, near the much better known Alligator Pond site (41SM442) that had been recorded in 2011 by Mark Walters. The Alligator Pond site is on property owned by Thacker, a Texas Archeological Stewardship Network member. 41SM32 is a prehistoric archaeological site that was found and recorded in September 1940 by Jack Hughes, who later went on to a career as a professional archaeologist in Texas. The site is on Little Saline Creek, a northward-flowing tributary to the Sabine River about 10 km to the north, in the Post Oak Savannah of East Texas.

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