426 research outputs found
The use of laser scanning as a method for measuring stairways following an accident
Copyright: 2015 Survey Review Ltd.MORE OpenChoice: Open Access ArticleStairs present significant potential for harm to their users. A fall on stairs, particularly in descent,
often leads to serious injury or even death. The authors have been involved in the investigation of
many workplace stair accidents. Proper forensic investigation into the cause of a stair accident
has often found the incident to be wholly or partly caused by poor stair design. In order to
establish the relationship between the stair design and a given fall, an onsite survey has to be
conducted, determining the rises and goings along with other key dimensions. The Health and
Safety Laboratory (HSL), Buxton, UK, regularly undertake this type of survey using a digital
inclinometer, a steel rule and a tape measure. Laser scanning is an emerging technique that is
now accessible to the surveyor to complement or replace traditional approaches. The laser
scanner and associated software produces a dense point survey in 3D, allowing dimensional
analysis of the features. The authors used both traditional and laser scanning techniques to study
the scenes of two fatal stair falls. The analysis presented allows the suitability of laser scanning for
stair-fall investigation to be considered. Identification and classification of errors are needed in
order to consider if the error is acceptable or can be mitigated. Laser scanners are impressive
instruments providing data from which can be used to create a virtual 3D environment that can be
used to reconstruct and explain an event and contributing factors. The use of both survey
methods currently provides the investigator with complimentary data that allows accurate
measurements to be presented in the context of the three-dimensional environment.European Social Fund (ESF
Genomic analysis of human and mouse TCL1 loci reveals a complex of tightly clustered genes
TCL1 and TCL1b genes on human chromosome 14q23.1 are activated in T cell leukemias by translocations and inversions at 14q32.1, juxtaposing them to regulatory elements of T cell receptor genes. In this report we present the cloning, mapping, and expression analysis of the human and murine TCL1/Tcl1 locus. In addition to TCL1 and TCL1b, the human locus contains two additional genes, TCL1-neighboring genes (TNG) 1 and 2, encoding proteins of 141 and 110 aa, respectively. Both genes show no homology to any known genes, but their expression profiles are very similar to those of TCL1 and TCL1b. TNG1 and TNG2 also are activated in T cell leukemias with rearrangements at 14q32.1. To aid in the development of a mouse model we also have characterized the murine Tcl1 locus and found five genes homologous to human TCL1b. Tcl1b1- Tcl1b5 proteins range from 117 to 123 aa and are 65-80% similar, but they show only a 30-40% similarity to human TCL1b. All five mouse Tcl1b and murine Tcl1 mRNAs are abundant in mouse oocytes and two-cell embryos but rare in various adult tissues and lymphoid cell lines. These data suggest a similar or complementary function of these proteins in early embryogenesis
Quantum Control of Trapped Polyatomic Molecules for eEDM Searches
Ultracold polyatomic molecules are promising candidates for experiments in
quantum science, quantum sensing, ultracold chemistry, and precision
measurements of physics beyond the Standard Model. A key, yet unrealized,
requirement of these experiments is the ability to achieve full quantum control
over the complex internal structure of the molecules. Here, we establish
coherent control of individual quantum states in a polyatomic molecule, calcium
monohydroxide (CaOH), and use these techniques to demonstrate a method for
searching for the electron electric dipole moment (eEDM). Optically trapped,
ultracold CaOH molecules are prepared in a single quantum state, polarized in
an electric field, and coherently transferred into an eEDM sensitive state
where an electron spin precession measurement is performed. To extend the
coherence time of the measurement, we utilize eEDM sensitive states with
tunable, near-zero magnetic field sensitivity. The spin precession coherence
time is limited by AC Stark shifts and uncontrolled magnetic fields. These
results establish a path for eEDM searches with trapped polyatomic molecules,
towards orders-of-magnitude improved experimental sensitivity to
time-reversal-violating physics
An unfolding signifier: London's Baltic Exchange in Tallinn
In the summer of 2007 an unusual cargo arrived at Muuga and Paldiski harbors outside Tallinn. It consisted of nearly 50 containers holding over 1,000 tons of building material ranging from marble columns, staircases and fireplaces, to sculpted allegorical figures, wooden paneling and old-fashioned telephone booths. They were once part of the Baltic Exchange in the City of London. Soon they will become facets of the landscape of Tallinn. The following article charts this remarkable story and deploys this fragmented monument to analyze three issues relating to the Estonian capital: the relocation of the âBronze Soldierâ, the demolition of the Sakala Culture Center, and Tallinnâs future role as European Cultural Capital in 2011
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