Natural Indicators of Lithic Artifact Authenticity

Lithic artifact replicas represent a threat to the scientific study of regional artifact collections. Elimination of their potentially negative effect on the validity of the data resulting from these studies requires effective artifact authentication analysis. Artifact surface alterations and authigenic deposits that have resulted from post-depositional pedological processes can serve as a basis for these analyses. These surface conditions include erosion, gloss, desert vanish, stain, bleach, corrosion, encrustation, and mineral deposits. A combination of these surface conditions is strong evidence of antiquity, and coupled with the absence of evidence of modern manufacturing, provides a sound basis for authentication.

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Revealing metallic ink in Herculaneum papyri

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1519958113 ◽

2016 ◽

Vol 113 (14) ◽

pp. 3751-3754 ◽

Cited By ~ 24

Author(s):

Emmanuel Brun ◽

Marine Cotte ◽

Jonathan Wright ◽

Marie Ruat ◽

Pieter Tack ◽

...

Keyword(s):

Computed Tomography ◽

Natural History ◽

Strong Evidence ◽

Scientific Study ◽

First Century ◽

Fundamental Importance ◽

Historical Understanding ◽

Greco Roman ◽

Pliny The Elder

Writing on paper is essential to civilization, as Pliny the Elder remarks in his Natural History, when he describes the various types of papyri, the method of manufacturing them, and all that concerns writing materials in the mid-first century AD. For this reason, a rigorous scientific study of writing is of fundamental importance for the historical understanding of ancient societies. We show that metallic ink was used several centuries earlier than previously thought. In particular, we found strong evidence that lead was intentionally used in the ink of Herculaneum papyri and discuss the possible existence of ruled lines traced on the papyrus texture. In addition, the metallic concentrations found in these fragments deliver important information in view of optimizing future computed tomography (CT) experiments on still-unrolled Herculaneum scrolls to improve the readability of texts in the only surviving ancient Greco-Roman library.

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The Choice of Methods of Quarry Wastewater Purifying

E3S Web of Conferences ◽

10.1051/e3sconf/20184101039 ◽

2018 ◽

Vol 41 ◽

pp. 01039 ◽

Cited By ~ 3

Author(s):

Yury Lesin ◽

Vyacheslav Gogolin ◽

Elena Murko ◽

Sergey Markov ◽

Jurgen Kretschmann

Keyword(s):

Natural Environment ◽

Industrial Wastewater ◽

Open Pit ◽

Mineral Deposits ◽

Open Pit Mining ◽

Overburden Rock ◽

Complex Processes ◽

Processing Plants ◽

Negative Effect ◽

Main Components

The negative effect made by mining enterprises on the natural environment has complex origination. The intensive pollution is observed because of the influence of mineral deposits open-pit mining on the atmosphere, water resources and landscape complexes. Complex processes of environmental anthropogenic changes caused by open pits’ operations have brought to light the problem of surface water pollution near large mining segments. Industrial wastewater of mining enterprises has a significant impact on the natural environment. In connection with the continuous and significant increase in the volume of mining, the amount of wastewater from mines, quarries and processing plants is constantly increasing. The main components of wastewater from operating mining enterprises are mine (quarry) waters, as well as runoff from atmospheric waters polluted by water erosion of dumps and mineral stacks. The paper describes the possible ways of quarry wastewater purifying – using hydrocyclones and artificial filtering arrays made from overburden rock.

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The oxidation of Inconel alloy MA754 at low oxidation potential

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074884 ◽

1983 ◽

Vol 41 ◽

pp. 218-219

Author(s):

D. N. Braski ◽

P. D. Goodell ◽

J. V. Cathcart ◽

R. H. Kane

Keyword(s):

Surface Layer ◽

Oxidation Potential ◽

Metal Interface ◽

Elevated Temperature Strength ◽

Surface Conditions ◽

Inconel Alloy ◽

Inco Alloy ◽

Resistance To Oxidation ◽

Oxide Particles ◽

Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

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International Association for the Scientific Study ofIntellectual DisabilitiesNew Millenium: Research to PracticeSeattle, Washington, USA, August 1–6 2000

Journal of Intellectual Disability Research ◽

10.1046/j.1365-2788.2000.00282.x ◽

2000 ◽

Vol 44 (2) ◽

pp. 187

Keyword(s):

International Association ◽

Scientific Study

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Social Motives Predict Loneliness During a Developmental Transition

Swiss Journal of Psychology ◽

10.1024/1421-0185/a000201 ◽

2017 ◽

Vol 76 (4) ◽

pp. 145-153 ◽

Cited By ~ 4

Author(s):

Jana Nikitin ◽

Alexandra M. Freund

Keyword(s):

Social Relationships ◽

Well Being ◽

Social Avoidance ◽

Social Approach ◽

Social Motives ◽

Developmental Transitions ◽

Avoidance Motivation ◽

Negative Effect ◽

Low Levels

Abstract. Establishing new social relationships is important for mastering developmental transitions in young adulthood. In a 2-year longitudinal study with four measurement occasions (T1: n = 245, T2: n = 96, T3: n = 103, T4: n = 85), we investigated the role of social motives in college students’ mastery of the transition of moving out of the parental home, using loneliness as an indicator of poor adjustment to the transition. Students with strong social approach motivation reported stable and low levels of loneliness. In contrast, students with strong social avoidance motivation reported high levels of loneliness. However, this effect dissipated relatively quickly as most of the young adults adapted to the transition over a period of several weeks. The present study also provides evidence for an interaction between social approach and social avoidance motives: Social approach motives buffered the negative effect on social well-being of social avoidance motives. These results illustrate the importance of social approach and social avoidance motives and their interplay during developmental transitions.

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A Longitudinal Study of Mental Health in Emerging Adults

Swiss Journal of Psychology ◽

10.1024/1421-0185/a000132 ◽

2014 ◽

Vol 73 (3) ◽

pp. 135-141 ◽

Cited By ~ 1

Author(s):

Monica S. Bachmann ◽

Hansjörg Znoj ◽

Katja Haemmerli

Keyword(s):

Mental Health ◽

Longitudinal Study ◽

Emerging Adults ◽

Poor Mental Health ◽

Need Satisfaction ◽

Computer Assisted ◽

Consistency Model ◽

Negative Effect ◽

The Cross ◽

Health Model

Emerging adulthood is a time of instability. This longitudinal study investigated the relationship between mental health and need satisfaction among emerging adults over a period of five years and focused on gender-specific differences. Two possible causal models were examined: (1) the mental health model, which predicts that incongruence is due to the presence of impaired mental health at an earlier point in time; (2) the consistency model, which predicts that impaired mental health is due to a higher level of incongruence reported at an earlier point in time. Emerging adults (N = 1,017) aged 18–24 completed computer-assisted telephone interviews in 2003 (T1), 2005 (T2), and 2008 (T3). The results indicate that better mental health at T1 predicts a lower level of incongruence two years later (T2), when prior level of incongruence is controlled for. The same cross-lagged effect is shown for T3. However, the cross-lagged paths from incongruence to mental health are marginally associated when prior mental health is controlled for. No gender differences were found in the cross-lagged model. The results support the mental health model and show that incongruence does not have a long-lasting negative effect on mental health. The results highlight the importance of identifying emerging adults with poor mental health early to provide support regarding need satisfaction.

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Concurrent Electrodermal and Eyeblink Conditioning With Masked and Unmasked Stimuli

Journal of Psychophysiology ◽

10.1027/0269-8803/a000259 ◽

2021 ◽

Vol 35 (1) ◽

pp. 35-42

Author(s):

José Luis Marcos ◽

Azahara Marcos

Keyword(s):

Unconditioned Stimulus ◽

Strong Evidence ◽

Eyeblink Conditioning ◽

Noise Burst ◽

Conditioning Phase ◽

Contingency Awareness ◽

Blank Screen ◽

Neutral Face ◽

Fearful Face

Abstract. The aim of this study was to determine if contingency awareness between the conditioned (CS) and unconditioned stimulus (US) is necessary for concurrent electrodermal and eyeblink conditioning to masked stimuli. An angry woman’s face (CS+) and a fearful face (CS−) were presented for 23 milliseconds (ms) and followed by a neutral face as a mask. A 98 dB noise burst (US) was administered 477 ms after CS+ offset to elicit both electrodermal and eyeblink responses. For the unmasking conditioning a 176 ms blank screen was inserted between the CS and the mask. Contingency awareness was assessed using trial-by-trial ratings of US-expectancy in a post-conditioning phase. The results showed acquisition of differential electrodermal and eyeblink conditioning in aware, but not in unaware participants. Acquisition of differential eyeblink conditioning required more trials than electrodermal conditioning. These results provided strong evidence of the causal role of contingency awareness on differential eyeblink and electrodermal conditioning.

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Working Memory, Mental Prospection, Time Orientation, and Cognitive Insight

Journal of Individual Differences ◽

10.1027/1614-0001/a000111 ◽

2013 ◽

Vol 34 (3) ◽

pp. 159-169 ◽

Cited By ~ 4

Author(s):

Sevtap Cinan ◽

Aslı Doğan

Keyword(s):

Working Memory ◽

Structural Equation ◽

Factor Model ◽

Time Orientation ◽

Equation Modeling ◽

Cognitive Insight ◽

Confirmatory Factor ◽

Negative Effect ◽

Positive Effect ◽

Three Factor

This research is new in its attempt to take future time orientation, morningness orientation, and prospective memory as measures of mental prospection, and to examine a three-factor model that assumes working memory, mental prospection, and cognitive insight are independent but related higher-order cognitive constructs by using confirmatory factor analysis (CFA). The three-factor model produced a good fit to the data. An alternative one-factor model was tested and rejected. The results suggest that working memory and cognitive insight are distinguishable, related constructs, and that both are distinct from, but negatively associated with, mental prospection. In addition, structural equation modeling (SEM) showed that working memory had a strong positive effect on cognitive insight and a moderate negative effect on mental prospection.

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