Long-term evaluation of adolescents treated operatively for spondylolisthesis. A comparison of in situ arthrodesis only with in situ arthrodesis and reduction followed by immobilization in a cast.

1992 ◽  
Vol 74 (5) ◽  
pp. 693-704 ◽  
Author(s):  
J K Burkus ◽  
J E Lonstein ◽  
R B Winter ◽  
F Denis
Keyword(s):  
Term Evaluation

scholarly journals Long-term evaluation of eyes with central corneal thickness <400 µm following laser in situ keratomileusis

2016 ◽  
pp. 535 ◽  
Author(s):  
Mohammad Reza Djodeyre ◽  
Jaime Beltran ◽  
Julio Ortega-Usobiaga ◽  
Felix Gonzalez-Lopez ◽  
Ana Ruiz-Rizaldos ◽  
...  
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Laser In Situ Keratomileusis ◽  
Term Evaluation

Long-term evaluation of hyperopic laser in situ keratomileusis

2003 ◽  
Vol 29 (11) ◽  
pp. 2181-2188 ◽  
Author(s):  
David Zadok ◽  
Frederick Raifkup ◽  
David Landau ◽  
Joseph Frucht-Pery
Keyword(s):  
Laser In Situ Keratomileusis ◽  
Term Evaluation

scholarly journals Retrieval of aerosol properties from ceilometer and photometer measurements: long-term evaluation with in situ data and statistical analysis at Montsec (southern Pyrenees)

2019 ◽  
Vol 12 (6) ◽  
pp. 3255-3267 ◽  
Author(s):  
Gloria Titos ◽  
Marina Ealo ◽  
Roberto Román ◽  
Alberto Cazorla ◽  
Yolanda Sola ◽  
...  
Keyword(s):  
Optical Properties ◽  
Statistical Analysis ◽  
North African ◽  
Aerosol Optical Properties ◽  
In Situ Data ◽  
Term Evaluation ◽  
Air Mass Origin ◽  
Aerosol Volume

Abstract. Given the need for accurate knowledge of aerosol microphysical and optical properties with height resolution, various algorithms combining vertically resolved and column-integrated aerosol information have been developed in the last years. Here we present new results of vertically resolved extensive aerosol optical properties (backscattering, scattering and extinction) and volume concentrations retrieved with the GRASP (Generalized Retrieval of Aerosol and Surface Properties) algorithm over a 3-year period. The range-corrected signal (RCS) at 1064 nm measured with a ceilometer and the aerosol optical depth (AOD) and sky radiances from a sun/sky photometer have been used as input for this algorithm. We perform a detailed evaluation of GRASP retrievals with simultaneous in situ measurements performed at the same height, at the Montsec mountaintop observatory (MSA) in the Pre-Pyrenees (northeastern Spain). This is the first long-term evaluation of various outputs of this algorithm; previous evaluations focused only on the study of aerosol volume concentration for short-term periods. In general, our results show good agreement between techniques although GRASP inversions yield higher values than those measured in situ. The statistical analysis of the extinction coefficient vertical profiles shows a clear seasonality as well as significant differences depending on the air mass origin. The observed seasonal cycle is mainly modulated by a higher development of the atmospheric boundary layer (ABL) during warm months, which favors the transport of pollutants to MSA, and higher influence of regional and North African episodes. On the other hand, in winter, MSA is frequently influenced by free-troposphere conditions and venting periods and therefore lower extinction coefficients that markedly decrease with height. This study shows the potentiality of implementing GRASP in ceilometer and lidar networks for obtaining aerosol optical properties and volume concentrations at multiple sites, which will definitely contribute to enhancing the representativeness of the aerosol vertical distribution as well as to providing useful information for satellite and global model evaluation.

Long-term evaluation of a spectral sensor for nitrite and nitrate

2008 ◽  
Vol 57 (10) ◽  
pp. 1563-1569 ◽  
Author(s):  
L. Rieger ◽  
P. A. Vanrolleghem ◽  
G. Langergraber ◽  
D. Kaelin ◽  
H. Siegrist
Keyword(s):  
Prediction Interval ◽  
Nitrate Concentration ◽  
Pilot Scale ◽  
Low Concentration ◽  
Uv Sensor ◽  
Alarm Systems ◽  
Nitrate Concentrations ◽  
Term Evaluation

A spectral in-situ UV sensor was investigated to measure nitrite and nitrate concentrations in the effluent of the EAWAG pilot-scale plant. The sensor was used with a calibration that was based on data from another WWTP and was operated over a period of 1.5 years. The results showed constant accuracy although the sensor was operated with minimal maintenance (manual cleaning once a month). It could be shown that the sensor was able to accurately predict the nitrite and nitrate concentration with a precision of 0.32 mg N/l (95% prediction interval at mean lab value of 1.15 mg N/l) and 1.08 mg N/l (at 5.55 mg N/l) for nitrite and nitrate, respectively. The UV sensor showed good results for nitrite in the low concentration range and very accurate results for higher concentrations (up to 10 mg N/l). This allows using the sensor for alarm systems as well as for control concepts at WWTPs.

scholarly journals Hardness, compressive strength and resilience of complete denture lining materials: an in situ study

2020 ◽  
Vol 68 ◽  
Author(s):  
Hugo de CARVALHO JUNIOR ◽  
Vítor Hugo Marçal de CARVALHO ◽  
Roberta Tarkany BASTING
Keyword(s):  
Compressive Strength ◽  
Acrylic Resin ◽  
Time Intervals ◽  
Soft Liner ◽  
Term Evaluation ◽  
Materials Used ◽  
Tissue Conditioner ◽  
Hardness Values

ABSTRACT Objective The aim of this study was to evaluate the in situ hardness, compressive strength and resilience of soft lining materials used in total removable prostheses in different time intervals Methods total of 48 rectangular test specimens (10 x 3 x 2 mm) were fabricated of each of the polyvinylsiloxane-based soft liner (Mucopren Soft) and acrylic resin-based material (Trusoft), which were placed on total removable prostheses bases of 12 volunteers (n = 12). The hardness (Shore A), compressive strength (in MPa) and resilience (in Kgf/cm2) were evaluated in different time intervals: 0, 7, 30 and 60 days, at three different locations of the specimens surface. Results The two-way ANOVA and Tukey test showed that the polyvinylsiloxane-based soft liner presented higher hardness values (p = 0.0113) and higher compressive strength (p=0.0252) than the acrylic resin-based material at immediate and 7 days evaluations. The polyvinylsiloxane-based soft liner presented higher resilience values than the acrylic resin-based material at all times (p = 0.0133). Hardness and compressive strength were similar for both materials at 30 and 60 days evaluations. Conclusions For both materials,there was a tendency for an increase of hardness, compressive strength and resilience over time, influenced by the composition of the tissue conditioner. The polyvinylsiloxane-based soft liner presented higher hardness, compressive strength and resilience than the acrylic resin-based material, specially considering a long-term evaluation up to 60 days.

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