scholarly journals Pushing the Precision Limit of 14C AMS

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Peter Steier ◽  
Franz Dellinger ◽  
Walter Kutschera ◽  
Alfred Priller ◽  
Werner Rom ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Beam Current ◽  
Measurement Precision ◽  
Charge Effects ◽  
Sources Of Uncertainty ◽  
Evaluation Procedures ◽  
Precision Limit ◽  
Single Effect ◽  
Insight Into ◽  
Profound Insight

High precision for radiocarbon cannot be reached without profound insight into the various sources of uncertainty which only can be obtained from systematic investigations. In this paper, we present a whole series of investigations where in some cases 16O:17O:18O served as a substitute for 12C:13C:14C. This circumvents the disadvantages of event counting, providing more precise results in a much shorter time. As expected, not a single effect but a combination of many effects of similar importance were found to be limiting the precision.We will discuss the influence of machine tuning and stability, isotope fractionation, beam current, space charge effects, sputter target geometry, and cratering. Refined measurement and data evaluation procedures allow one to overcome several of these limitations. Systematic measurements on FIRI-D wood show that a measurement precision of ±20 14C yr (1 σ) can be achieved for single-sputter targets.

The Monk

2016 ◽  
Author(s):  
Matthew Lewis
Keyword(s):  
French Revolution ◽  
English Literature ◽  
Young Girl ◽  
The Novel ◽  
Reading Public ◽  
Ghost Stories ◽  
Gothic Fiction ◽  
Black Magic ◽  
Insight Into ◽  
Profound Insight

‘He was deaf to the murmurs of conscience, and resolved to satisfy his desires at any price.’ The Monk (1796) is a sensational story of temptation and depravity, a masterpiece of Gothic fiction and the first horror novel in English literature. The respected monk Ambrosio, the Abbot of a Capuchin monastery in Madrid, is overwhelmed with desire for a young girl; once having abandoned his monastic vows he begins a terrible descent into immorality and violence. His appalling fall from grace embraces blasphemy, black magic, torture, rape, and murder, and places his very soul in jeopardy. Lewis’s extraordinary tale drew on folklore, legendary ghost stories, and contemporary dread inspired by the terrors of the French Revolution. Its excesses shocked the reading public and it was condemned as obscene. The novel continues to beguile and shock readers today with its gruesome catalogue of iniquities, while at the same time giving a profound insight into the deep anxieties experienced by British citizens during one of the most turbulent periods in the nation’s history.

The “Doctrine of Love” in ʿAbd Allāh al-Anṣārī’s Manāzil al-sāʾirīn with Critical Paraphrase of ʿAbd al-Razzāq Kāshānī’s Commentary

2016 ◽  
Vol 5 (2) ◽  
pp. 140-155
Author(s):  
Mukhtar H. Ali
Keyword(s):  
English Translation ◽  
Guided Reading ◽  
Classic Work ◽  
Key Topics ◽  
Insight Into ◽  
Commentarial Tradition ◽  
Profound Insight

This article represents a preliminary inquiry into a little known and understudied commentarial tradition upon ʿAbd Allāh al-Anṣārī’s classic work on the stations of Sufism, the Manāzil al-sāʾirīn (Stations of the Wayfarers). After briefly taking stock of the considerably late commentarial tradition which this important text engendered, we will take as our case study one of the Manāzil ’s key topics, namely its sixty-first chapter on the station of love. This pivotal section on love gives profound insight into early Sufism and into the minds of two of its greatest exponents. Anṣārī discusses the station of love in detail, as he does with every chapter, in three aspects, each pertaining to the three types of wayfarers: the initiates, the elect, and the foremost of the elect. Then, we shall turn our attention to perhaps the most important Sufi commentary upon this work by an important follower of the school of Ibn al-ʿArabī, ʿAbd al-Razzāq Kāshānī, offering a guided reading of his commentary upon Anṣarī’s chapter on love in the Manāzil. A complete English translation of this chapter will be offered and appropriately contextualized.

The Oxford Handbook of Time in Music

2021 ◽  
Keyword(s):  
Cultural Studies ◽  
Music Theory ◽  
Musical Work ◽  
Musical Practice ◽  
Musical Time ◽  
Music Making ◽  
Nature Of Time ◽  
And Performance ◽  
Insight Into ◽  
Profound Insight

As the art that calls most attention to temporality, music provides us with profound insight into the nature of time, and time equally offers us one of the richest lenses through which to interrogate musical practice and thought. In this volume, musical time, arrayed across a spectrum of genres and performance/compositional contexts is explored from a multiplicity of perspectives. The contributions to the volume all register the centrality of time to our understanding of music and music-making and offer perspectives on time in music, particularly though not exclusively attending to contemporary forms of musical work. In sharing insights drawn from philosophy, music theory, ethnomusicology, psychology of performance and cultural studies, the book articulates a range of understandings on the metrics, politics and socialities woven into musical time.

A Survey on Various Applications of Artificial Neural Networks in Selected Fields of Healthcare

2011 ◽  
pp. 20-59
Author(s):  
Wolfgang I. Schollhorn ◽  
Jörg M. Jager
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Neuromuscular Control ◽  
Neural Nets ◽  
Biomedical Signals ◽  
Potential Benefits ◽  
Artificial Neural ◽  
Number Of Publications ◽  
Insight Into ◽  
Profound Insight

This chapter gives an overview of artificial neural networks as instruments for processing miscellaneous biomedical signals. A variety of applications are illustrated in several areas of healthcare. The structure of this chapter is rather oriented on medical fields like cardiology, gynecology, or neuromuscular control than on types of neural nets. Many examples demonstrate how neural nets can support the diagnosis and prediction of diseases. However, their content does not claim completeness due to the enormous amount and exponentially increasing number of publications in this field. Besides the potential benefits for healthcare, some remarks on underlying assumptions are also included as well as problems which may occur while applying artificial neural nets. It is hoped that this review gives profound insight into strengths as well as weaknesses of artificial neural networks as tools for processing biomedical signals.

scholarly journals Sample Dilution for AMS 14C Analysis of Small Samples (30–150 μg C)

Radiocarbon ◽  
2008 ◽  
Vol 50 (3) ◽  
pp. 413-436 ◽  
Author(s):  
M de Rooij ◽  
J van der Plicht ◽  
H A J Meijer
Keyword(s):  
Mass Spectrometry ◽  
Isotope Fractionation ◽  
Ice Core ◽  
Measurement Precision ◽  
Small Samples ◽  
Test Case ◽  
Routine Method ◽  
Optimum Conditions ◽  
Dilution Technique ◽  
Sample Dilution

We investigated sample dilution as a technique for accelerator mass spectrometry (AMS) radiocarbon analysis of very small samples (down to 30 μg). By diluting such samples up to a total weight of 200 μg, we can still perform reliable AMS measurements and improve the success rate significantly for targets that are difficult to measure. A disadvantage of this dilution technique is a loss of measurement precision. In addition, calculations of the 14C/12C isotope ratios and the uncertainties therein are not straightforward because of peculiarities in isotope fractionation processes in the AMS system. Therefore, to make sample dilution a routine method in our laboratory, we did extensive theoretical and experimental research to find the optimum conditions for all relevant parameters. Here, we report on the first detailed study dealing with all aspects of sample dilution. Our results can be applied in general. As an illustrative test case, we analyze 14C data for CO2 extracted from an ice core, from which samples of 35 μg C or less are available.

Uncertainty Estimation of Probe Calibrations Using a Power Flux Density System of (18~26.5) GHz

2013 ◽  
Vol 433-435 ◽  
pp. 882-886
Author(s):  
Jin Yuan Li ◽  
Ming Xie
Keyword(s):  
Flux Density ◽  
Measurement Model ◽  
Uncertainty Estimation ◽  
Calibration Factor ◽  
Power Flux ◽  
Sources Of Uncertainty ◽  
Evaluation Procedures ◽  
Good Agreement

A method for the uncertainty estimation of probe calibrations using the power flux density (PFD) system of (18~26.5) GHz recently developed at the National Institute of Metrology, China is presented. A measurement model is developed first, and then the sources of uncertainty and the corresponding evaluation procedures are explained. The method is used to estimate the uncertainty of the calibration factor of a FP7050 probe at 18 GHz obtained by the PFD system. The good agreement between the calibration results from two PFD systems validates the method.

Coleridge, John Dewey, and the Art of Contemplation

2017 ◽  
Author(s):  
Kathleen Wheeler
Keyword(s):  
John Dewey ◽  
Human Experience ◽  
Philosophy Of Art ◽  
Ordinary Life ◽  
Art As Experience ◽  
Insight Into ◽  
Profound Insight

Chapter 4 reads Dewey’s Art as Experience as steeped in Coleridge, a constant reference throughout this foundational pragmatist aesthetics. Indeed Dewey said he found ‘spiritual emancipation’ in Coleridge’s Aids to Reflection, calling it ‘my first Bible’ (qtd in John Beer Aids to Reflection cxxv). Coleridge’s account of perception as active and creative, not passively receptive, gave Dewey profound insight into human experience, helping him articulate his philosophy of ‘art as experience’ whereby art originates in imaginative ordinary life. For Coleridge, ‘act’ and ‘activity’ ground both mind and matter in the same natural powers of production/creation: ‘a repetition in the finite mind of the eternal act of creation in the infinite I AM’. Dewey’s analogy between the error of separating art from ordinary life, and divorcing imaginativeness from ordinary perception, shows how memories of prior acts of imaginative perception usurp the place of actual acts, as dead metaphors do in language.

The Jagged Cliffs of Mount Sinai

1996 ◽  
Vol 50 (3) ◽  
pp. 251-263
Author(s):  
Dennis T. Olson
Keyword(s):  
Book Of The Covenant ◽  
Mount Sinai ◽  
Insight Into ◽  
Profound Insight

Scholars often attempt to explain away the tensions and jagged edges the reader can observe in the text and thought-world of the Book of the Covenant. If one works with these tensions, however, one stands to gain profound insight into the ethics and theology of this book.

Sign in / Sign up

Export Citation Format

Share Document