1,400 research outputs found
Understanding Chipped Stone Tools
No full textUnderstanding Chipped Stone Tools is a beginner’s guide to the study of stone artefacts, written for an undergraduate student audience. In a clear and easy-to-interpret style, Brian Hayden explores the complex issue of using stone artefacts as a key source for reconstructing past activities and his preferred approaches. At 140 pages long this volume is an easy read for academics.No Full Tex
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Influence of diluent alkyl substitution on the extraction of Am(III) and Eu(III) by a 6,6’-bis(1,2,4-triazin-3-yl)-2,2’-bipyridine ligand dissolved in alkylated cyclohexanone Diluents
No full textSeveral alkylated cyclohexanones were investigated as potential diluents for the selective extraction of Am(III) from Eu(III) from nitric acid solutions by the CyMe4-BTBP ligand. No significant extraction of either of the metal ions was observed for these diluents themselves. In the extractions from 1 M HNO3, 3-methylcyclohexanone and 4-methylcyclohexanone gave comparable results to cyclohexanone whereas in the extractions from 4 M HNO3, 2-methylcyclohexanone, 3-methylcyclohexanone and 4-methylcyclohexanone all gave superior results. For the monomethylated diluents, DAm and SFAm/Eu decreased in the order of alkyl substitution 2 > 4 ~ 3. However, alkyl substitution of cyclohexanone significantly slows down the extraction kinetics compared to cyclohexanone, and the position of alkyl substitution was found to play an important role in the solvents properties. 3-Methylcyclohexanone was identified as the most promising of the diluent
Excavation report for the bomboro site: A chert quarry site in the bomboro valley, maros regency, south sulawesi
No full textWilayah karst Maros-Pangkep berisi banyak situs arkeologi Holosen dan Late-Pleistocene, banyak di antaranya berisi kumpulan artefak yang didominasi oleh artefak rijang. Namun dimikian, belum ada sumber untuk bahan baku yang telah diidentifikasi. Sementara batuan dasar kapur yang melimpah kadang-kadang berisi kantong dan lapisan nodul rijang, singkapan ini menunjukkan sedikit bukti untuk eksploitasi atau tambangan prasejarah, dan kecil kemungkinan rijang diperoleh dari anak sungai atau sungai. Situs Bomboro dipilih untuk penggalian karena permukaan tanahnya yang kaya dengan artefak batu termasuk serpihan, batu inti, dan tatal. Rijangnya mungkin telah ditambang dari nodul yang keluar dari batu gamping lokal di Lembah Bomboro. Sampai sekarang, situs ini merupakan tambang batu kuno pertama yang diidentifikasi di wilayah tersebut. Sementara tambang terbuka tidak ada duanya, itu mungkin berfungsi sebagai sumber rijang selama periode Toalean, sekitar 2-8 ribu tahun yang lalu.Full Tex
Beyond the main function: An experimental study of the use of hardwood boomerangs in retouching activities
No full textRetouched lithic tools result from the functional modification of their edges following knapping operations. The study of the later stages of the reduction sequence is fundamental to understanding the techno-functional features of any toolkit. In Australia, a gap exists in the study of the chaîne opératoire of lithic tools shaped or re-shaped through percussion retouching. In our previous works (Martellotta EF., 2021, Martellotta EF., 2022), we have presented evidence for the use of hardwood boomerangs for retouching purposes in Australian Aboriginal communities. Through a detailed experimental protocol, the present study demonstrates how boomerangs can function as retouchers. We found that the use-wear generated on the boomerang’s surface during retouch activity is comparable to retouch-induced impact traces observed on Palaeolithic bone retouchers, as well as to experimental bone retouchers generated in our replication experiments. Finally, we explore the role that microscopic lithic chips embedded in the retouchers’ surface play in the formation process of retouching marks. Our results address the need for a deeper investigation of percussion retouching techniques in Australian contexts, opening the possibility that uncommon objects—such as boomerangs—could be used for this task. This concept also highlights the broader topic of the highly diverse multipurpose application of many Indigenous tools throughout Australia. At the same time, the study reveals a deep functional connection between osseous and wooden objects—a topic rarely investigated in archaeological contexts
Doctor-family-patient relationship: The Chinese paradigm of informed consent
No full textBioethics is a subject far removed from the Chinese, even from many Chinese medical students and medical professionals. In-depth interviews with eighteen physicians, patients, and family members provided a deeper understanding of bioethical practices in contemporary China, especially with regard to the doctor-patient relationship (DPR) and informed consent. The Chinese model of doctor-family-patient relationship (DFPR), instead of DPR, is taken to reflect Chinese Confucian cultural commitments. An examination of the history of Chinese culture and the profession of medicine in China is used to disclose the deep roots of these commitments. The author predicts that the DFPR model will further develop in China but that it will maintain its Chinese character.EthicsSocial Sciences, BiomedicalPubMedCPCI-SSH(ISSHP)SSCI4
MONTE-CARLO STUDY OF 3-D Z4 GAUGE-Z2 HIGGS THEORY WITH RADIAL DEGREE OF FREEDOM
No full textPhysics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)0ARTICLE3311-3251
CHINESE PATENT-LAW AND PATENT INFORMATION-SERVICE
No full textInformation Science & Library ScienceSSCI1ARTICLE111-182
Comments on author citations for nomenclatural novelties published in volume 15 of the Flora Reipublicae Popularis Sinicae (FRPS)
No full textSpin-Crossover in Supramolecular Iron(II)-2,6-bis(1 H-Pyrazol-1-yl)pyridine Complexes: Toward Spin-State Switchable Single-Molecule Junctions
No full textSpin-crossover (SCO) active iron(II) complexes are an integral class of switchable and bistable molecular materials. Spin-state switching properties of the SCO complexes have been studied in the bulk and single-molecule levels to progress toward fabricating molecule-based switching and memory elements. Supramolecular SCO complexes featuring anchoring groups for metallic electrodes, for example, gold (Au), are ideal candidates to study spin-state switching at the single-molecule level. In this study, we report on the spin-state switching characteristics of supramolecular iron(II) complexes 1 and 2 composed of functional 4-([2,2′-bithiophen]-5-ylethynyl)-2,6-di(1H-pyrazol-1-yl)pyridine (L1) and 4-(2-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)ethynyl)-2,6-di(1H-pyrazol-1-yl)pyridine (L2) ligands, respectively. Density functional theory (DFT) studies revealed stretching-induced spin-state switching in a molecular junction composed of complex 1, taken as a representative example, and gold electrodes. Single-molecule conductance traces revealed the unfavorable orientation of the complexes in the junctions to demonstrate the spin-state dependence of the conductance.QN/van der Zant La
LOWER RANGE OF STRINGOCEPHALUS
No full textThe lower range of Stringocephalus around the world is considered within the Givetian under the SDS (Subcommission on Devonian Stratigraphy) newly proposed definition of the Eifelian/Givetian boundary. However, in a measured section at Liujing (Guangxi, China), in which conodonts and silicified brachiopods occur in the same samples, Stringocephalus occurs in a shelf-edge fauna in beds that yield conodonts diagnostic of the lower part of the ensensis Zone of the uppermost Eifelian.GeologySCI(E)0ARTICLE273-773
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