scholarly journals Evolution of Furnaces

2021 ◽  
Vol 9 (9) ◽  
pp. 1367-1374
Author(s):  
Kavya C D
Keyword(s):  
Bronze Age ◽  
Melting Furnace ◽  
Copper Smelting ◽  
Productivity Improvement ◽  
Native Copper ◽  
Reducing Conditions ◽  
Air Supply ◽  
Copper Metallurgy ◽  
New Generation

Abstract: A new generation of industrial melting furnaces has been developed during the last 25 years. Present practices followed in Furnaces are discussed in this paper. Through a literature review account of various practices presently being followed in industries using Furnaces has been carried out with a view to gather principal of working. Apart from this a pilot study has also been carried out in few industries in India. We provide some recommendations for the productivity improvement. Due to lack of proper instruments the effect of the ill practices cannot be precisely judged. If this is properly measured, the percentage of productivity improvement in steel melting Furnace can be calculated. The review is carried out from the literature in the various journals and manuals. The first controlled use of fire in metallurgy dates from the eighth millennium ВС, when native copper was deliberately heated to form artifacts. Problems how to distinguish between native copper and smelted copper are addressed, especially what concerns the role of iron in copper. kilns. Metallurgy is an independent development. The decisive factor was the introduction of charcoal that was important to produce reducing conditions during firing. The earliest stages in metallurgy are represented by a non-slagging process. Reduction of ores was carried out in crucibles as exemplified by finds from Anatolia, Iran, Jordan, and the Iberian Peninsula. Special attention is paid to the putative early stages of metallurgy claimed to exist at that age. The is called Neolithic and Chalcolithic copper smelting there is critically prooved in the light of radio carbon data. Wind-powered furnaces played a major role in Early Bronze Age copper metallurgy, as exemplified by sites in the Feinan-area, in Wadi Dara, Egypt, and at numerous sites in the Aegean. Later, artificial air supply by bellows and tuyeres was introduced.

scholarly journals New evidence for prehistoric copper metallurgy in the vicinity of Bor

Starinar ◽  
2016 ◽  
pp. 173-191
Author(s):  
Aleksandar Kapuran ◽  
Dragana Zivkovic ◽  
Nada Strbac
Keyword(s):  
Material Culture ◽  
Bronze Age ◽  
Iron Age ◽  
Copper Ore ◽  
North Eastern ◽  
Metallurgical Furnaces ◽  
Copper Metallurgy ◽  
New Evidence ◽  
The Bronze Age

The last three years of archaeological investigations at the site Ru`ana in Banjsko Polje, in the immediate vicinity of Bor, have provided new evidence regarding the role of non-ferrous metallurgy in the economy of the prehistoric communities of north-eastern Serbia. The remains of metallurgical furnaces and a large amount of metallic slags at two neighbouring sites in the mentioned settlement reveal that locations with many installations for the thermal processing of copper ore existed in the Bronze Age. We believe, judging by the finds of material culture, that metallurgical activities in this area also continued into the Iron Age and, possibly, into the 4th century AD.

scholarly journals Early evidence of royal purple dyed textile from Timna Valley (Israel)

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245897
Author(s):  
Naama Sukenik ◽  
David Iluz ◽  
Zohar Amar ◽  
Alexander Varvak ◽  
Orit Shamir ◽  
...  
Keyword(s):  
Bronze Age ◽  
Iron Age ◽  
Social Stratification ◽  
Copper Smelting ◽  
Dyeing Process ◽  
Three Samples ◽  
Middle Bronze Age ◽  
Specific Species

In the context of a broad study aimed at examining dyeing technologies in the Timna textiles collection, three samples of prestigious fibers dyed with murex sea snail were identified. Our identification is based on the presence of 6-monobromoindigotin and 6,6-dibromoindigotin components (detected using HPLC analysis), which is considered unequivocal evidence for the use of murex-derived purple dyestuff. Furthermore, by comparing the analytical results with those obtained in a series of controlled dyeing experiments we were able to shed more light on the specific species used in the dyeing process and glean insights into the ancient dyeing technology. The samples originated from excavations at the extensive Iron Age copper smelting site of “Slaves’ Hill” (Site 34), which is tightly dated by radiocarbon to the late 11th–early 10th centuries BCE. While evidence for the important role of purple dyes in the ancient Mediterranean goes back to the Middle Bronze Age (early 2nd millennium BCE), finds of dyed textiles are extremely rare, and those from Timna are the oldest currently known in the Southern Levant. In conjunction with other observations of the very high quality of the Timna textiles, this provides an exceptional opportunity to address questions related to social stratification and organization of the nomadic society operating the mines (early Edom), the “fashion” of elite in the region during the early Iron Age, trade connections, technological capabilities, and more.

THE ROLE OF SOUTHERN UZBEKISTAN IN THE SYSTEM OF BRONZE AGE TRADE ROADS

2019 ◽  
Vol 21 (2) ◽  
pp. 43-47
Author(s):  
Jasur Togaev ◽  
Keyword(s):  
Bronze Age ◽  
Historical Aspect

This article analyzes the role of Southern Uzbekistan in the system of Bronze Age trade roads. Results of archaeological researches and information of scientific literatures were analyzed in historical aspect

An Analysis of Professional Competence Indicator Possession among U.S. Accounting Faculty

2016 ◽  
Vol 32 (2) ◽  
pp. 17-38 ◽  
Author(s):  
Kenneth J. Smith ◽  
David J. Emerson
Keyword(s):  
Student Performance ◽  
Professional Competence ◽  
Academic Research ◽  
Practical Experience ◽  
Accounting Faculty ◽  
Accounting Practice ◽  
Cpa Exam ◽  
Primary Focus ◽  
New Generation

ABSTRACT Recently there has been much discourse regarding the existence, extent, causes, and consequences of a purported divide between accounting practice and academia. The crux of this issue relates to the charge that many new-generation faculty have a primary focus on academic research, but lack significant practical experience or certification, and the related claim that students may lack the requisite skills upon graduation. This study addresses these concerns by examining the incidence and trend in the possession of practice credentials, experience, and other activities among accounting faculty who graduated between 1994 and 2013. We evaluate how differences in institutional focus, possession of a practice credential, and proportion of credentialed faculty manifest in research propensities, current business experience, and student performance on the CPA exam. We identify a downward trend in practice credential possession that is more pronounced at research-oriented institutions. We further find significant differences in experience and publication activity across levels of both institutional focus and possession of a practice credential. We also find that students from research-oriented universities, schools with separate AACSB accounting accreditation, and those with a higher percentage credentialed faculty perform better on the CPA exam. Other results and the role of adjunct faculty in bridging this alleged divide are also examined.

scholarly journals Seeing Children in Prehistory: A View from Bronze Age Ireland

2021 ◽  
pp. 1-16
Author(s):  
Mark Haughton
Keyword(s):  
Social Structure ◽  
Bronze Age ◽  
The Past ◽  
Written Sources

Despite growing strength in recent decades, an archaeology of childhood has often been overlooked by those studying prehistory. This is concerning because communities are enlivened by their children, and conversations with and about children often provide a critical arena for the discussion of aspects of societies which prehistorians are comfortable addressing, such as social structure, identity and personhood. Through an exploration of childhood as expressed in the Earlier Bronze Age burials from Ireland, this article demonstrates that neither written sources, artistic depictions nor toys are necessary to speak of children in the past. Indeed, an approach which tacks between scales reveals subtle trends in the treatment of children which speak to wider shared concerns and allows a reflection on the role of children in prehistory.

scholarly journals Exploring mobility in Italian Neolithic and Copper Age communities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Flavio De Angelis ◽  
Maura Pellegrini ◽  
Cristina Martínez-Labarga ◽  
Laura Anzivino ◽  
Gabriele Scorrano ◽  
...  
Keyword(s):  
Bronze Age ◽  
Southern Italy ◽  
Sedentary Lifestyle ◽  
Human Mobility ◽  
The Body ◽  
Copper Age ◽  
Mobility Pattern ◽  
Oxygen And Carbon Isotope ◽  
Northern Areas

AbstractAs a means for investigating human mobility during late the Neolithic to the Copper Age in central and southern Italy, this study presents a novel dataset of enamel oxygen and carbon isotope values (δ18Oca and δ13Cca) from the carbonate fraction of biogenic apatite for one hundred and twenty-six individual teeth coming from two Neolithic and eight Copper Age communities. The measured δ18Oca values suggest a significant role of local sources in the water inputs to the body water, whereas δ13Cca values indicate food resources, principally based on C3 plants. Both δ13Cca and δ18Oca ranges vary substantially when samples are broken down into local populations. Statistically defined thresholds, accounting for intra-site variability, allow the identification of only a few outliers in the eight Copper Age communities, suggesting that sedentary lifestyle rather than extensive mobility characterized the investigated populations. This seems to be also typical of the two studied Neolithic communities. Overall, this research shows that the investigated periods in peninsular Italy differed in mobility pattern from the following Bronze Age communities from more northern areas.

scholarly journals Targeting Protein Kinase C in Glioblastoma Treatment

Biomedicines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 381
Author(s):  
Noelia Geribaldi-Doldán ◽  
Irati Hervás-Corpión ◽  
Ricardo Gómez-Oliva ◽  
Samuel Domínguez-García ◽  
Félix A. Ruiz ◽  
...  
Keyword(s):  
Stem Cells ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Combined Treatment ◽  
Primary Brain Tumor ◽  
Kinase C ◽  
Pkc Isozymes ◽  
New Generation ◽  
Effective Drugs

Glioblastoma (GBM) is the most frequent and aggressive primary brain tumor and is associated with a poor prognosis. Despite the use of combined treatment approaches, recurrence is almost inevitable and survival longer than 14 or 15 months after diagnosis is low. It is therefore necessary to identify new therapeutic targets to fight GBM progression and recurrence. Some publications have pointed out the role of glioma stem cells (GSCs) as the origin of GBM. These cells, with characteristics of neural stem cells (NSC) present in physiological neurogenic niches, have been proposed as being responsible for the high resistance of GBM to current treatments such as temozolomide (TMZ). The protein Kinase C (PKC) family members play an essential role in transducing signals related with cell cycle entrance, differentiation and apoptosis in NSC and participate in distinct signaling cascades that determine NSC and GSC dynamics. Thus, PKC could be a suitable druggable target to treat recurrent GBM. Clinical trials have tested the efficacy of PKCβ inhibitors, and preclinical studies have focused on other PKC isozymes. Here, we discuss the idea that other PKC isozymes may also be involved in GBM progression and that the development of a new generation of effective drugs should consider the balance between the activation of different PKC subtypes.

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