BACKGROUND The Walter Reed Visual Assessment Scale (WRVAS) was designed to measure physical deformity as perceived by patients with idiopathic scoliosis. Previous studies have shown that the instrument has excellent internal consistency and a high correlation with the radiological magnitude of scoliotic curves. Nonetheless, it is not known whether the scale can discriminate between the various ...

Abstract A sample of 128 pottery shards curated by the National Museum Denmark, from seven archaeological sites in US Virgin Islands, has been dated using thermoluminescence dating (TL) technique with purpose refining local pre-colonial chronology. The results TL-dating generally confirm chronologies offered Wild for St. John and there is considerable variation identified traditional frameworks...

Traveling wave tube (TWT) is a powerful vacuum electronic device used to amplify radio-frequency (RF) signals with numerous applications, including radar, television and telephone satellite communications. TWT design in nutshell comprises of pencil-like electron beam (e-beam) interacting guiding it slow-wave structure (SWS). In our studies here the e-beam represented by one-dimensional flow SWS...

PURPOSE This study evaluates not only the clinical usefulness but also the problems in attenuation correction for thallium-201 (Tl-201) myocardial SPECT by means of simultaneous transmission and emission data acquisition in the detection of coronary artery disease (CAD). METHODS A three-detector SPECT system equipped with a Tc-99m line source and fan-beam collimators was used for simultaneous...

We have investigated the number of structural genes present in ASL-1 cells, a murine leukemia cell line which encodes the heavy chain of thymus leukemia (TL) antigens, a protein which is similar to the Class I histocompatibility antigens. TL-specific messenger RNA was purified from polysomes of ASL-1 cells by immunoprecipitation, and this messenger RNA translated in vitro to produce a Mr 42,000...

This paper considers the principles of modeling, control, and simulation variable speed wind turbines (VSWTs), based on a stand-alone doubly fed induction generator (DFIG). The DFIG is used to feed three-phase highly inductive load through long cable via multi-level frequency converter (MLFC). proposed MLFC increases number voltage levels with less power electronic components as compared conven...

In regular inference, a regular language is inferred from answers to a finite set of membership queries, each of which asks whether the language contains a certain word. One of the most well-known regular inference algorithms is the L∗ algorithm due to Dana Angluin. However, there are almost no extensions of these algorithms to the setting of timed systems. We extend Angluin’s algorithm for on-...

The design of Cyclotron CYCHU-10 has been carried out at Huazhong University of Science and Technology (HUST). Because of the low centre frequency (99MHz) of its RF system, we should choose suitable directional couplers for the RF system which is supposed to be highdirectivity and tight-structure. This paper analyzes and synthesizes kinds of directional couplers, especially microstrip structure...

A novel dual-band antenna by using CRLH-TL structure is proposed for the wireless local area network (WLAN) application. The dual-band behavior is achieved by loading shorted meander lines and interdigital capacitor to form unit-cell CRLH-TL loaded antenna. The bandwidth enhancement of proposed antenna can be achieved by merging the two extended-bandwidth resonances. The dual-band version exhib...

background: similar to the thermoluminescence (tl) spectra, the optical parameters variations can also be used in tl crystals for dosimetry purposes. these optical parameters can include absorption, transmission and reflection coefficients. materials and methods: single crystals of kbr and kcl which have been used in this research were grown from laboratory grade extra pure precursor powders. c...