Determination of the Mechanical Requirements for a Progressive Correction System of Pectus Excavatum in Children

2005 ◽  
Vol 15 (5) ◽  
pp. 478-481 ◽  
Author(s):  
Eugen Sorin Boia ◽  
Romeo Susan-Resiga ◽  
Petru Cornel Raicov ◽  
Calin Marius Popoiu ◽  
Radu Emil Iacob
Keyword(s):  
Pectus Excavatum ◽  
Correction System

Background Corrections in the Determination of Cd and Pb by Flame AAS in Plant and Soil Samples with High Fe Levels

1987 ◽  
Vol 41 (3) ◽  
pp. 388-390 ◽  
Author(s):  
J. J. Van Der Lee ◽  
E. Temminghoff ◽  
V. J. G. Houba ◽  
I. Novozamsky
Keyword(s):  
Soil Samples ◽  
Spectral Interference ◽  
Background Correction ◽  
Soil Extracts ◽  
Plant Leaf ◽  
Correction System

Plant leaf digests and soil extracts were analyzed for Cd and Pb by flame AAS in three ways: with deuterium background correction, with the Smith-Hieftje background correction system, and without any background correction. Background correction proved to be necessary for both elements and for both types of material. The two background correction systems gave equal results, provided that Fe concentrations were low. High Fe concentrations caused spectral interference (i.e., structured background), which was overcompensated by the deuterium system. The Smith-Hieftje system, however, produced correct results.

Aluminum determined in plasma and urine by atomic absorption spectroscopy with a transversely heated graphite atomizer furnace

1994 ◽  
Vol 40 (3) ◽  
pp. 431-434 ◽  
Author(s):  
C Bradley ◽  
F Y Leung
Keyword(s):  
Correlation Analysis ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Background Correction ◽  
Heating Cycle ◽  
Slope Coefficient ◽  
Correction System ◽  
Zeeman Background Correction

Abstract We compared a stabilized-temperature L'vov platform furnace containing an end-heated graphite atomizer (HGA) and transverse Zeeman background-correction system with a side-heated furnace system (transversely heated graphite atomizer; THGA) containing a longitudinal Zeeman background-correction system for the determination of aluminum in plasma and urine. The regression statistics for the correlation analysis of the two systems (slope coefficient = 0.995, intercept = -1.710, Sy/x = 0.021 micrograms/L) indicate that the systems generate comparable results. The newer technology of the THGA furnace with its more uniform and faster heating cycle allows a lower atomization temperature for aluminum, 2200 degrees C. Analyte carryover was significantly reduced in the THGA furnace system. The THGA system generates results equivalent to HGA in about one-third less time, thus making possible a greater throughput of samples in a busy laboratory.

Radiographic Determination of Skeletal Maturity Guides Optimal Timing of Bar Removal After Minimally Invasive Repair of Pectus Excavatum

2020 ◽  
pp. 000313482094062
Author(s):  
Logan M. Bond ◽  
Sheldon J. Bond
Keyword(s):  
Minimally Invasive ◽  
Pectus Excavatum ◽  
Skeletal Maturity ◽  
Young Patients ◽  
Skeletal Maturation ◽  
Optimal Timing ◽  
Growth Plates ◽  
Number Of Patients ◽  
Post Operation

Background A small number of patients treated with minimally invasive correction of pectus excavatum recur after bar removal. This risk appears to be greater in younger children who continue to grow following bar removal. Methods We propose the use of wrist films to determine skeletal maturity and delay bar removal until it is completed. This is not possible in very young patients (less than 14 years of age) or necessary in patients older than 19. Results In the 14-year to 18-year age group, we have used wrist films to determine skeletal maturity in 25 patients. Ten patients (age 14-18) demonstrated full maturation, and their bars were removed at 2 years. Five patients had films that demonstrated nearly closed growth plates, and those bars were removed 6 months later (2.5 years post-insertion). Ten patients had 2 sets of films taken, initially at 2 years post-operation demonstrating open growth plates. Films 12 months later showed skeletal maturation. Their bars were removed at 3 years post-operation. There were no recurrences with an average follow-up of 3 years. Discussion Radiographic determination of skeletal maturity may be used as a guide to the timing of bar removal following the correction of pectus excavatum.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

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