The vacuum magnetic birefringence experiment: a test for quantum electrodynamicsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 153-158 ◽  
Author(s):  
P. Berceau ◽  
R. Battesti ◽  
M. Fouché ◽  
C. Rizzo
Keyword(s):  
Experimental Data ◽  
Quantum Electrodynamics ◽  
Atomic Systems ◽  
International Conference ◽  
Magnetic Birefringence ◽  
The Status ◽  
Different Gases

In this contribution to PSAS 2010 we describe the status of the BMV experiment whose goal is to measure the vacuum magnetic birefringence that would represent a pure test for quantum electrodynamics. We present our latest experimental data obtained from Cotton–Mouton measurements of different gases.

Recent developments in X-ray tests of quantum electrodynamicsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 763-772 ◽  
Author(s):  
C. T. Chantler ◽  
J. A. Kimpton
Keyword(s):  
Quantum Electrodynamics ◽  
Lamb Shift ◽  
Experimental Tests ◽  
Significant Progress ◽  
Experimental Development ◽  
Atomic Systems ◽  
X Ray ◽  
The Status ◽  
Recent Developments ◽  
Simple Systems

Experimental tests of quantum electrodynamics (QED) have developed dramatically for simple systems of hydrogen and helium, but there has also been significant progress for medium-Z hydrogenic and helium-like atoms over the last few years. In this area, tests are often based on X-ray spectroscopic measurements, and here we review some key developments. Of particular interest is the status of few-electron QED in the medium-Z regime, the fine-structure Lamb shift from X-ray measurements, tests of two-electron QED, and of np subshell and excited state QED. We discuss some recent secondary tests of the data to confirm the quality and different approaches to experimental development to address the dominant systematics in this area.

Toward a determination of the fine structure constant at LNE by means of a new Thompson–Lampard calculable capacitorThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 169-176 ◽  
Author(s):  
P. Gournay ◽  
O. Thévenot ◽  
L. Dupont ◽  
J. M. David ◽  
F. Piquemal
Keyword(s):  
Fine Structure ◽  
Quantum Electrodynamics ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Current Development ◽  
Atomic Systems ◽  
International Conference ◽  
New Si ◽  
Cross Capacitor

This paper reports on the current development of a new Thompson–Lampard calculable capacitor at LNE. The goal is to determine the von Klitzing constant RK at a significant level of uncertainty of about one part in 108. The comparison with other accurate measurements of h/e2 serves as a relevant test of validity of the theory predicting RK = h/e2, a decisive issue within the context of the new SI. Conversely, assuming that this relation is exact, the measurement of RK and thus that of the fine structure constant α can be used for testing quantum electrodynamics theory. The mechanical structure of the new LNE calculable cross capacitor has been designed and a new set of electrodes has been fabricated. The assembling of the calculable capacitor is in progress.

scholarly journals The status of CMV as a human pathogen

1988 ◽  
Vol 100 (1) ◽  
pp. 1-15 ◽  
Author(s):  
P. D. Griffiths ◽  
J. E. Grundy
Keyword(s):  
Experimental Data ◽  
Human Body ◽  
Primary Infection ◽  
Immune Surveillance ◽  
Infectious Agent ◽  
Human Pathogen ◽  
The Status

Cytomegalovirus (CMV) is a common infectious agent which is well adapted to its host. Following primary infection, which is almost always asymptomatic in people with normal immunity, the virus establishes latency at sites which are unknown. The virus is probably maintained in this latent state by immune surveillance mechanisms since immunosuppression frequently leads to reactivation of virus.Cytomegalovirus has been identified in most anatomical areas of the human body. The aim of this article is to define criteria for pathogenicity so that clinical and experimental data can be reviewed to determine if CMV is likely to cause disease at these various clinical sites. Thus, patients have been shown to die frequentlywithCMV but do they diefromit?

Textiles and perishable materials

2018 ◽  
Author(s):  
Johanna Banck-Burgess
Keyword(s):  
Experimental Data ◽  
Everyday Life ◽  
Iron Age ◽  
Raw Materials ◽  
Visual Representations ◽  
Detailed Knowledge ◽  
Textile Production ◽  
Funerary Rituals ◽  
The Status

This chapter challenges traditional views on Iron Age dress. Recent research has greatly enhanced our understanding of how textiles were manufactured in Iron Age Europe. The variety of qualities, textures, techniques, raw materials, colours, and cuts give insights into the detailed knowledge of the craftspeople involved. Textiles used for dress, blankets, or furniture fittings were appreciated not only for their appearance, but also for the quality of the work. In everyday life, their optical qualities were used to express and signal gender, social roles and status, while the labour expended on textiles found in wealthy burials underlines both the status of the deceased and the extent of conspicuous consumption in funerary rituals—for instance, for wrapping grave furniture and goods. The chapter also looks at experimental data showing how labour-intensive textile production was, and the types of clothing and accessories found in different archaeological contexts or depicted in visual representations.

scholarly journals Implementing quantum electrodynamics with ultracold atomic systems

2017 ◽  
Vol 19 (2) ◽  
pp. 023030 ◽  
Author(s):  
V Kasper ◽  
F Hebenstreit ◽  
F Jendrzejewski ◽  
M K Oberthaler ◽  
J Berges
Keyword(s):  
Quantum Electrodynamics ◽  
Atomic Systems

scholarly journals Non-spherical proton shape and hydrogen hyperfine splittingThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 773-783 ◽  
Author(s):  
A. J. Buchmann
Keyword(s):  
Charge Distribution ◽  
Hyperfine Splitting ◽  
Spherical Charge ◽  
Atomic Systems ◽  
Absolute Value ◽  
International Conference

We show that the non-spherical charge distribution of the proton manifests itself in hydrogen hyperfine splitting as an increase (in absolute value) of the proton Zemach radius and polarization contributions.

Progress in precise laser spectroscopy of antiprotonic helium atomsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Masaki Hori
Keyword(s):  
Laser Spectroscopy ◽  
Optical Transition ◽  
Antiprotonic Helium ◽  
Atomic Systems ◽  
International Conference

The ASACUSA collaboration at CERN has previously measured the optical transition frequencies of antiprotonic helium to a precision of <1 part in 108 by laser spectroscopy. We describe some recent theoretical and experimental developmental work carried out by our collaboration to further improve the experimental precision.

Research on Dynamic Alignment for Sophisticated System Based on ACP Technology

2012 ◽  
Vol 630 ◽  
pp. 473-478 ◽  
Author(s):  
Fei Wan ◽  
Guo Xi Li ◽  
Jing Zhong Gong ◽  
Bao Zhong Wu
Keyword(s):  
Experimental Data ◽  
Dynamic Simulation ◽  
Process Parameters ◽  
Simulation Software ◽  
Contact Theory ◽  
Dynamic Parameters ◽  
Agent Model ◽  
The Status ◽  
Alignment Process ◽  
Dynamic Alignment

To change the status of time-consuming and over-reliance on technicians in mechanical system alignment process, the ACP technology is presented. The mapping between alignment process parameters and dynamic parameters was established through contact theory to build the agent model for parts. While the second mapping between dynamic parameters and machine dynamic characteristics is calculated by dynamic simulation software to conduct computational experiments. Experimental data is analyzed in order to implement data mine, optimize the alignment process, guide technician alignment, modify the theory mapping and improve the alignment efficiency.

scholarly journals Energy spectra of muonic atoms in quantum electrodynamics

2019 ◽  
Vol 204 ◽  
pp. 05007 ◽  
Author(s):  
A. E. Dorokhov ◽  
A. A. Krutov ◽  
A. P. Martynenko ◽  
F. A. Martynenko ◽  
O. S. Sukhorukova
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Energy Spectrum ◽  
Hyperfine Structure ◽  
Nuclear Structure ◽  
Quantum Electrodynamics ◽  
Vacuum Polarization ◽  
Energy Spectra ◽  
Hyperfine Splittings ◽  
S States

Vacuum polarization, nuclear structure and recoil, radiative corrections to the hyperfine structure of S-states in muonic ions of lithium, beryllium and boron are calculated on the basis of quasipotential method in quantum electrodynamics. We consider contributions in first and second orders of perturbation theory which have the order α5 and α6 in the energy spectrum. Total values of hyperfine splittings are obtained which can be used for a comparison with future experimental data.

English as the nativized foreign language and its impact on Serbian

English Today ◽  
2014 ◽  
Vol 30 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Tvrtko Prćić
Keyword(s):  
Foreign Language ◽  
American Studies ◽  
First Language ◽  
Foreign Languages ◽  
Official Language ◽  
International Conference ◽  
The Past ◽  
World Communication ◽  
Expanding Circle ◽  
The Status

The concept of English as the nativized foreign language – or ENFL, for short – was first proposed in 2003, at the 13th International Conference on British and American Studies, in Timişoara, Romania, in a presentation entitled ‘Rethinking the status of English today: is it still a purely foreign language?’, and subsequently published as Prćić, 2003 and 2004. Identified and described in these papers are new, additional properties of English, which have developed over the past few decades, concurrently with the establishment of English as the first language of world communication and as today's global lingua franca (for accounts of this phenomenon, see Jenkins, 2007; Mauranen & Ranta, 2010; Seidlhofer, 2011). Viewed from the perspective of the Expanding Circle (Kachru, 1985), English can no longer be considered a purely, or prototypically, foreign language, usually characterized by three defining properties: not the first language of a country, not the official language of a country and taught as a subject in schools (cf. Richards & Schmidt, 2002). Three newly emerged defining properties of English, over and above the three customary ones, set it uniquely apart from all other purely foreign languages and they will be briefly summarized below (for more extensive discussions, see Prćić, 2003, 2004, 2011a: Chapter 2, 2011b, 2014).

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