Karen Harry | University of Nevada, Las Vegas (original) (raw)

Papers by Karen Harry

University Press of Colorado eBooks, Apr 2, 2018

Life beyond the Boundaries

Ceramic Production and Circulation in the Greater …, 2002

The exploration of a stable and high-rate anode is of pivotal importance for achieving advanced a... more The exploration of a stable and high-rate anode is of pivotal importance for achieving advanced aqueous rechargeable batteries. Owing to the beneficial properties of high conductivity, suitable negative working voltage, and three-electron redox, bismuth (Bi) is considered as a promising anode material, but it suffers from poor stability. Here, we successfully endow Bi nanoflakes (NFs) with prominent cycling performance by a one-step surface oxidation approach to remarkably boost its reversibility. As a result, the partially oxidized Bi NFs (BiO x) show an admirable capacity (0.38 mA h cm À2 at 2 mA cm À2), good rate capability and superior long-term stability (almost no capacity decay after 20 000 cycles). Furthermore, a durable aqueous Ni//Bi battery is constructed based on the optimized BiO x anode, which exhibits excellent durability with 96% capacity retention after 5000 cycles. This study could open a new avenue for the rational design of efficient anodes for eco-friendly and reliable aqueous rechargeable batteries.

Journal of California and Great Basin Anthropology, 2012

American antiquity, 1995

Dorn (1983) has proposed that changes in rock varnish chemistry can be used to date varnished art... more Dorn (1983) has proposed that changes in rock varnish chemistry can be used to date varnished artifacts. Specifically, he suggests that the varnish cation ratio, (K + Ca)/Ti, decreases as the age of the varnished surface increases. Although the method is generating significant archaeological interest, many of its underlying assumptions remain undemonstrated. This paper examines one premise of the method, that the varnishing process is regular. Data obtainedfrom varnish distributional studies challenge this assumption and, when compared with the chemical data obtained from the same archaeological site, suggest that the cation-ratio dating technique may not be able to provide accurate dates for most varnished artifacts. Dorn (1983) ha propuesto que cambios en la guimica del barniz de las rocas puede usarse para datar artefactos barnizados. Especificamente, el sugiere que el radio de cationes de barniz (K + Ca)/Ti disminuye a medida que la edad de la superficie barnizada aumenta. A4 unque el metodo ha generado un significativo interes arqueologico, muchos de sus supuestos bsicos continuan sin ser demostrados. Este articulo examina una premisa del metodo, la que sostiene que el proceso de barnizado es regular. Datos obtenidos de estudios de distribucion de barniz desafian esta premisa y, cuando son comprados con los datos quimicos obtenidos del mismo sitio arqueologico, sugieren que la tecnica de datacion por radio de cationes podria no ser adecuada para extraer fechas exactas de la majoria de los artefactors barnizados. Rock varnish is a shiny, generally black accretion found on the surfaces of some rocks, including petroglyphs and lithic artifacts, in arid regions. Dorn (1983, 1992; Dorn and Oberlander 1981) has proposed that varnished materials can be dated by determining the cation ratios of the overlying varnish. This technique is based on the premise that rockvarnish chemistry changes predictably through time. Specifically, Dom proposes that the varnish cation ratio, (K + Ca)/Ti, decreases as the age of the varnish increases. This trend has been calibrated with varnish radiocarbon dates, and rock-varnish cation ratios have been used to assign numerical ages to landforms, surface artifacts, and rock art. Because these types of materials generally cannot be directly dated by other techniques, the cation-ratio dating method has generated substantial interest in the geological and archaeological communities. Archaeological applications include dating of petroglyphs from the

Kiva, 1989

Page 1. KIVA, Vol. 54, No. 3, 1989 THE OBSIDIAN ASSEMBLAGE FROM HOMOL&#x27;OVI III: SOCIA... more Page 1. KIVA, Vol. 54, No. 3, 1989 THE OBSIDIAN ASSEMBLAGE FROM HOMOL&#x27;OVI III: SOCIAL AND ECONOMIC IMPLICATIONS KAREN G. HARRY Arizona State Museum University of Arizona Tucson, AZ 85721 ABSTRACT ...

KIVA

This special issue of the Kiva is published in honor of Margaret Lyneis, who passed away in 2016 ... more This special issue of the Kiva is published in honor of Margaret Lyneis, who passed away in 2016 at the age of 78, after a long and influential career as a teacher and scholar. These papers developed out of a session presented at the 83rd annual meeting of Society for American Archaeology (SAA), held in Washington, D.C. in 2018. Collectively, the papers provide a snapshot of current findings from the Virgin Branch Puebloan region, also referred to as the Far Western Puebloan region (Lyneis 1995). All of the authors in this volume have been influenced, either directly or indirectly, by the work of Margaret Lyneis, and owe a debt of gratitude to her meticulous and groundbreaking work. Early Life and College Years Lyneis was born in Fond du Lac, Wisconsin in 1938 (Figure 1). She received her undergraduate degree from the University of Washington in 1959, and her master's and doctoral degrees from the University of California Los Angeles (UCLA) in 1964 and 1968, respectively. Margaret began her career at a time when few women were involved in field research, and she was among a generation of women in the 1960s who helped change that. While still a graduate student, she wrote to the director of the Tule Springs Expedition to ask if she could participate. As she relayed to the senior author, she received a letter enthusiastically accepting herbecause, she was told, they needed women on the project to type up the field notes and curation tags. Lyneis immediately wrote back that she did not intend to serve as a project secretary, but rather that she intended to participate in the fieldwork. Shutler relented and

Midcontinental Journal of Archaeology

KIVA, 1989

Page 1. KIVA, Vol. 54, No. 3, 1989 A PRELIMINARY ANALYSIS OF TEMPORAL CHANGES IN THE HOMOL&am... more Page 1. KIVA, Vol. 54, No. 3, 1989 A PRELIMINARY ANALYSIS OF TEMPORAL CHANGES IN THE HOMOL&amp;#x27;OVI III CHIPPED STONE ASSEMBLAGE LISA C. YOUNG and KAREN G. HARRY Arizona State Museum University of Arizona Tucson, AZ 85721 ABSTRACT ...

North American Archaeologist, 2017

In this article, we examine variation in the corrugation styles of ceramics from the Virgin Branc... more In this article, we examine variation in the corrugation styles of ceramics from the Virgin Branch Puebloan culture. These ceramics were recovered from two regions: the Moapa Valley of southern Nevada and the Mt. Dellenbaugh area of northwestern Arizona. Three wares-Shivwits, Moapa, and Tusayan-are examined, each of which was produced in different locations. Similarities and differences in corrugation styles between these wares are used to investigate ceramic learning frameworks and the nature of the pottery production and distribution system.

The Saa Archaeological Record, 2003

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