A DISCRETE LAKE MODEL AND ITS SENSITIVITY STUDY

Author(s):  
G. Blake ◽  
S. Gentil
Keyword(s):  
2011 ◽  
Vol 8 (6) ◽  
pp. 11357-11385 ◽  
Author(s):  
M. Potes ◽  
M. J. Costa ◽  
R. Salgado

Abstract. The quality control and monitoring of surface freshwaters is crucial, since some of these water masses constitute essential renewable water resources for a variety of purposes. In addition, changes in the surface water composition may affect physical properties of the lake water, such as temperature, which in turn may impact exchanges with the lower troposphere. The use of satellite remote sensing to estimate water turbidity of Alqueva reservoir, located in the south of Portugal, is explored. A validation study of the satellite derived water leaving spectral reflectance is firstly presented, using data taken during three field campaigns carried out during 2010 and early 2011. Secondly an empirical algorithm to estimate lake water surface turbidity from the combination of in situ and satellite measurements is proposed. The importance of water turbidity on the surface energy balance is tested in the form of a lake model sensitivity study to the water extinction coefficient (estimated from turbidity), showing that this is an important parameters tuning the lake surface temperature.


1964 ◽  
Vol 7 (4) ◽  
pp. 389-393 ◽  
Author(s):  
David C. Shepherd ◽  
Robert Goldstein ◽  
Benjamin Rosenblüt

Two separate studies investigated race and sex differences in normal auditory sensitivity. Study I measured thresholds at 500, 1000, and 2000 cps of 23 white men, 26 white women, 21 negro men, and 24 negro women using the method of limits. In Study II thresholds of 10 white men, 10 white women, 10 negro men, and 10 negro women were measured at 1000 cps using four different stimulus conditions and the method of adjustment by means of Bekesy audiometry. Results indicated that the white men and women in Study I heard significantly better than their negro counterparts at 1000 and 2000 cps. There were no significant differences between the average thresholds measured at 1000 cps of the white and negro men in Study II. White women produced better auditory thresholds with three stimulus conditions and significantly more sensitive thresholds with the slow pulsed stimulus than did the negro women in Study II.


2017 ◽  
Vol 04 (03) ◽  
pp. 231-236 ◽  
Author(s):  
Barham S. Mahmood ◽  
Jagar Ali ◽  
Shirzad B. Nazhat ◽  
David Devlin

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 308-314
Author(s):  
G. Greschik ◽  
M. Mikulas ◽  
A. Palisoc ◽  
C. Cassapakis ◽  
G. Veal
Keyword(s):  

2021 ◽  
Author(s):  
Hiroaki Ishikawa ◽  
Atsushi Ueno ◽  
Shinya Koganezawa ◽  
Yoshikazu Makino ◽  
Bernd Liebhardt ◽  
...  

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 58 ◽  
Author(s):  
Francesco Clementi

This paper presents a detailed study of the damages and collapses suffered by various masonry churches in the aftermath of the seismic sequence of Central Italy in 2016. The damages will first be analyzed and then compared with the numerical data obtained through 3D simulations with eigenfrequency and then nonlinear static analyses (i.e., pushover). The main purposes of this study are: (i) to create an adequately consistent sensitivity study on several definite case studies to obtain an insight into the role played by geometry—which is always unique when referred to churches—and by irregularities; (ii) validate or address the applicability limits of the more widespread nonlinear approach, widely recommended by the Italian Technical Regulations. Pushover analyses are conducted assuming that the masonry behaves as a nonlinear material with different tensile and compressive strengths. The consistent number of case studies investigated will show how conventional static approaches can identify, albeit in a qualitative way, the most critical macro-elements that usually trigger both global and local collapses, underlining once again how the phenomena are affected by the geometry of stones and bricks, the texture of the wall face, and irregularities in the plan and elevation and in addition to hypotheses made on the continuity between orthogonal walls.


2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Chihoko Y. Cullens ◽  
Thomas J. Immel ◽  
Colin C. Triplett ◽  
Yen-Jung Wu ◽  
Scott L. England ◽  
...  

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