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Full-Text Articles in Social and Behavioral Sciences
The Effect Of Band-Tail States On The Thermal Stability Of The Infrared Stimulated Luminescence From K-Feldspar, Bo Li, Sheng-Hua Li
The Effect Of Band-Tail States On The Thermal Stability Of The Infrared Stimulated Luminescence From K-Feldspar, Bo Li, Sheng-Hua Li
Faculty of Science, Medicine and Health - Papers: part A
The thermal stability of the infrared stimulated luminescence (IRSL) signal from a sedimentary K-feldspar was investigated using isothermal decay study. It is observed that the isothermal decay of IRSL signal cannot be described using a first-order exponential decay function. Instead, the decay can be well described by considering the presence of band-tail states. Based on the isothermal decay results, a trap depth of ∼1.92 eV was obtained for the IRSL stimulated at 50 °C and the width of the band-tail states was found to be ∼0.37 eV below the conduction band edge. Deeper trap depths (up to ∼2.06 eV) were …
Extending The Age Limit Of Luminescence Dating Using The Dose-Dependent Sensitivity Of Met-Pirir Signals From K-Feldspar, Bo Li, Zenobia Jacobs, Richard G. Roberts, Sheng-Hua Li
Extending The Age Limit Of Luminescence Dating Using The Dose-Dependent Sensitivity Of Met-Pirir Signals From K-Feldspar, Bo Li, Zenobia Jacobs, Richard G. Roberts, Sheng-Hua Li
Faculty of Science, Medicine and Health - Papers: part A
We investigated the sensitivity change of multiple-elevated-temperature (MET) stimulated post-infrared infrared-stimulated luminescence (MET-pIRIR) signals as a response to irradiation, sunlight bleaching and heating using samples from the Mu Us Desert, central China. A strong dose dependence of MET-pIRIR signal sensitivity was observed. The intensity of the test-dose signals (Tx) increase with the pre-dose received. Furthermore, the signal sensitivity can be reset by sunlight bleaching or heating. This suggests that both the electron traps and hole centres in K-feldspar can be bleached by sunlight, and can, therefore, be used for dating. Using the test-dose signal as a monitor for sensitivity change, …
On The Dose Dependency Of The Bleachable And Non-Bleachable Components Of Irsl From K-Feldspar: Improved Procedures For Luminescence Dating Of Quaternary Sediments, Bo Li, Richard G. Roberts, Zenobia Jacobs
On The Dose Dependency Of The Bleachable And Non-Bleachable Components Of Irsl From K-Feldspar: Improved Procedures For Luminescence Dating Of Quaternary Sediments, Bo Li, Richard G. Roberts, Zenobia Jacobs
Faculty of Science, Medicine and Health - Papers: part A
The infrared (IR) stimulated luminescence (IRSL) and post-IR IRSL (pIRIR) signals from K-feldspar can, for convenience, be divided into two components, bleachable and ‘non-bleachable’, where the latter corresponds to the ‘residual’ signal observed in sunlight-bleached samples. In this paper, we examine the non-bleachable component of IRSL of K-feldspar for several sedimentary samples from across Eurasia. We observed a large variability in the residual doses among these samples after prolonged exposure to sunlight. By employing multiple elevated temperature (MET) IR stimulations at 50–300 °C, we show that the residual dose increases systematically with stimulation temperature, attaining values as high as ∼50 …
Faces Of Homo Floresiensis (Lb1), Susan Hayes, Thomas Sutikna, Michael Morwood
Faces Of Homo Floresiensis (Lb1), Susan Hayes, Thomas Sutikna, Michael Morwood
Faculty of Science, Medicine and Health - Papers: part A
Since being excavated in 2003, the skull of LB1 (the holotype of Homo floresiensis) has been given many faces, though the details regarding how each was accomplished are typically few. Here we detail our application of known, and verified, relationships between the skull and soft tissues of anatomically modern humans to produce an evidence-based facial approximation of LB1. We then compare our results to nine pre-existing LB1 faces using geometric morphometrics. These analyses suggest our facial approximation differs in proportional facial width, upper lip height and nasal morphology. Some of these differences are likely due to a different interpretation of …
Beyond The Levant: First Evidence Of A Pre-Pottery Neolithic Incursion Into The Nefud Desert, Saudi Arabia, Remy Crassard, Michael D. Petraglia, Adrian G. Parker, Ash Parton, Richard G. Roberts, Zenobia Jacobs, Abdullah Alsharekh, Abdulaziz Al-Omari, Paul Breeze, Nick A. Drake, Huw S. Groucutt, Richard Jennings, Emmanuelle Regagnon, Ceri Shipton
Beyond The Levant: First Evidence Of A Pre-Pottery Neolithic Incursion Into The Nefud Desert, Saudi Arabia, Remy Crassard, Michael D. Petraglia, Adrian G. Parker, Ash Parton, Richard G. Roberts, Zenobia Jacobs, Abdullah Alsharekh, Abdulaziz Al-Omari, Paul Breeze, Nick A. Drake, Huw S. Groucutt, Richard Jennings, Emmanuelle Regagnon, Ceri Shipton
Faculty of Science, Medicine and Health - Papers: part A
Pre-Pottery Neolithic assemblages are best known from the fertile areas of the Mediterranean Levant. The archaeological site of Jebel Qattar 101 (JQ-101), at Jubbah in the southern part of the Nefud Desert of northern Saudi Arabia, contains a large collection of stone tools, adjacent to an Early Holocene palaeolake. The stone tool assemblage contains lithic types, including El-Khiam and Helwan projectile points, which are similar to those recorded in Pre-Pottery Neolithic A and Pre-Pottery Neolithic B assemblages in the Fertile Crescent. Jebel Qattar lies ~500 kilometres outside the previously identified geographic range of Pre-Pottery Neolithic cultures. Technological analysis of the …
Early And Middle Holocene Hunter-Gatherer Occupations In Western Amazonia: The Hidden Shell Middens, Umberto Lombardo, Katherine Szabo, Jose M. Capriles, Jan-Hendrik May, Wulf Amelung, Rainer Hutterer, Eva Lehndorff, Anna Plotzki, Heinz Veit
Early And Middle Holocene Hunter-Gatherer Occupations In Western Amazonia: The Hidden Shell Middens, Umberto Lombardo, Katherine Szabo, Jose M. Capriles, Jan-Hendrik May, Wulf Amelung, Rainer Hutterer, Eva Lehndorff, Anna Plotzki, Heinz Veit
Faculty of Science, Medicine and Health - Papers: part A
We report on previously unknown early archaeological sites in the Bolivian lowlands, demonstrating for the first time early and middle Holocene human presence in western Amazonia. Multidisciplinary research in forest islands situated in seasonally-inundated savannahs has revealed stratified shell middens produced by human foragers as early as 10,000 years ago, making them the oldest archaeological sites in the region. The absence of stone resources and partial burial by recent alluvial sediments has meant that these kinds of deposits have, until now, remained unidentified. We conducted core sampling, archaeological excavations and an interdisciplinary study of the stratigraphy and recovered materials from …
Micro-Biomechanics Of The Kebara 2 Hyoid And Its Implications For Speech In Neanderthals, Ruggero D'Anastasio, Stephen Wroe, Claudio Tuniz, Lucia Mancini, Deneb T. Cesana, Diego Dreossi, Mayoorendra Ravichandiran, Marie Attard, William C. H Parr, Anne Agur, Luigi Capasso
Micro-Biomechanics Of The Kebara 2 Hyoid And Its Implications For Speech In Neanderthals, Ruggero D'Anastasio, Stephen Wroe, Claudio Tuniz, Lucia Mancini, Deneb T. Cesana, Diego Dreossi, Mayoorendra Ravichandiran, Marie Attard, William C. H Parr, Anne Agur, Luigi Capasso
Faculty of Science, Medicine and Health - Papers: part A
The description of a Neanderthal hyoid from Kebara Cave (Israel) in 1989 fuelled scientific debate on the evolution of speech and complex language. Gross anatomy of the Kebara 2 hyoid differs little from that of modern humans. However, whether Homo neanderthalensis could use speech or complex language remains controversial. Similarity in overall shape does not necessarily demonstrate that the Kebara 2 hyoid was used in the same way as that of Homo sapiens. The mechanical performance of whole bones is partly controlled by internal trabecular geometries, regulated by bone-remodelling in response to the forces applied. Here we show that the …
Neandertal Toolmakers Left A Leatherworking Legacy, Zenobia Jacobs, Marie Soressi, Shannon P. Mcpherron
Neandertal Toolmakers Left A Leatherworking Legacy, Zenobia Jacobs, Marie Soressi, Shannon P. Mcpherron
Faculty of Science, Medicine and Health - Papers: part A
Ever since the Neandertal (Homo neanderthalensis) type fossil was discovered in the Neander Valley of Germany in 1856, the species has been variously portrayed as knuckle-dragging cavemen and primitive members of the human family tree who became extinct as a result of being more stupid than members of our own species, Homo sapiens.