scholarly journals Simple and Non-Linear Regression Techniques Used in Sandy-Clayey Soils to Predict the Pressuremeter Modulus and Limit Pressure: A Case Study of Tabriz Subway

2018 ◽  
Author(s):  
Samad Narimani ◽  
Hamid Chakeri ◽  
Seyed Morteza Davarpanah
Keyword(s):  
Test Performance ◽  
Field Tests ◽  
Empirical Equations ◽  
Clayey Soils ◽  
Regression Analyses ◽  
Uniaxial Compression Strength ◽  
Pressuremeter Test ◽  
Empirical Relations ◽  
Tabriz Metro ◽  
Regression Techniques

Nowadays, some common field tests consist of SPT test and pressuremeter test are performed in investigating the geotechnical parameters of projects such as tunneling. Due to the high cost of pressuremter test performance and its time-consuming procedure, using some empirical relations between SPT and Pressuremeter tests are recommended for primarily study of the project. The purpose of this study is to perform regression analyses between the NSPT and the uniaxial compression strength test and the pressuremeter test parameters obtained from a geotechnical investigation performed in route of 2nd line of Tabriz metro. Correlations were carried out for sandy and clayey soils separately. A series of simple and nonlinear multiple regression analyses are performed and as a result of analyses, several empirical equations are developed. It is shown that the empirical equations developed in this study are statistically acceptable. 

Characteristics of Hydraulic Shock Waves in an Inclined Chute Contraction - Experiments

2009 ◽  
Vol 25 (1) ◽  
pp. 129-136 ◽  
Author(s):  
C.-D. Jan ◽  
C.-J. Chang ◽  
J.-S. Lai ◽  
W.-D. Guo
Keyword(s):  
Experimental Data ◽  
Shock Waves ◽  
Froude Number ◽  
Inclination Angle ◽  
Laboratory Experiments ◽  
Deflection Angle ◽  
Experimental Results ◽  
Regression Analyses ◽  
Hydraulic Shock ◽  
Empirical Relations

AbstractThis paper presents the experimental results of the characteristics of hydraulic shock waves in an inclined chute contraction with consideration of the effects of sidewall deflection angle φ, bottom inclination angle θ and approach Froude number Fr0. Seventeen runs of laboratory experiments were conducted in the range of 27.45° ≤φ ≤ 40.17°, 6.22° ≤ θ ≤ 25.38° and 1.04 ≤ Fr0 ≤ 3.51. Based on the experimental data, three empirical dimensionless relations for the shock angle, maximum shockwave height, and corresponding position of maximum shockwave were obtained by regression analyses, respectively. These empirical relations would be useful for hydraulic engineers in designing chute contraction structures.

scholarly journals An Assessment on Permeability and Grout Take of Limestone: A Case Study at Mut Dam, Karaman, Turkey

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2649
Author(s):  
Ali Kayabasi ◽  
Candan Gokceoglu
Keyword(s):  
Rock Mass ◽  
Nonlinear Regression ◽  
Geological Strength Index ◽  
Empirical Equations ◽  
Regression Equations ◽  
Regression Analyses ◽  
Rock Mass Properties ◽  
Joint Spacing ◽  
Mass Properties ◽  
Karstic Limestone

The main purposes of the present study are to evaluate pilot grouting and to develop regression equations for prediction of grout intake. There are no permeability problems with the sandstone-siltstone-claystone alternations and basement clayey limestone at the dam site. Karstic limestone block is permeable due to karstification and heavy discontinuities. For the purpose of the study, Q system, geological strength index (GSI), secondary permeability index (SPI), joint spacing (JSP), joint apertures (Ap), Lugeon (Lu), and the permeability coefficient (k) were determined. Karstic limestone block rock mass properties correlated with grouting material amount. A series of simple and multiple nonlinear regression analyses was performed between grout take material amount (Gt) and average values of these rock mass properties. Significant determination coefficients were determined. Prediction capacity of the empirical equations were also examined with root mean square error (RMSE), values account for (VAF), mean absolute percentage error (MAPE), and prediction error evaluations. Considering simple regression analyses, the equation derived with Gt-SPI gives the best performance. The best prediction is determined with the equation derived with rock quality designation values (RQD), SPI, and joint aperture as input parameters with the multiple nonlinear regression analysis, in addition to this, other empirical equations also provide acceptable results.

PERSONALITY AND SOCIAL-EVALUATIVE ANXIETIES ASSOCIATED WITH RATING DISCOMFORT IN ANTICIPATED POSITIVE AND NEGATIVE FEEDBACK CONDITIONS

2002 ◽  
Vol 30 (4) ◽  
pp. 359-371 ◽  
Author(s):  
Thomas P. Sawyer ◽  
Lisa A. Hollis-Sawyer ◽  
Amanda Pokryfke
Keyword(s):  
Undergraduate Students ◽  
Negative Feedback ◽  
Performance Feedback ◽  
Positive Feedback ◽  
Test Performance ◽  
Inverse Relationship ◽  
Feedback Condition ◽  
Regression Analyses ◽  
Personality Dimensions ◽  
Positive And Negative Feedback

The purpose of this study was to assess the relationships between select personality dimensions, social-evaluative anxieties, and rating discomfort. Undergraduate students were told they would be giving test performance feedback to a confederate and were instructed on how to give this feedback, to some degree, based on condition. Correlation and regression analyses revealed some interesting patterns. Neuroticism was found to be significantly related to feelings of discomfort only under the positive feedback condition, while extraversion was found to be significantly related to feelings of discomfort only under the negative feedback condition. A significant inverse relationship was also found between both agreeableness and conscientiousness levels, and in reaction to giving positive feedback. Additional findings and implications are discussed.

scholarly journals A 1-Year Study of Endurance Runners: Training, Laboratory Tests, and Field Tests

2014 ◽  
Vol 9 (6) ◽  
pp. 1019-1025 ◽  
Author(s):  
Andy Galbraith ◽  
James Hopker ◽  
Marco Cardinale ◽  
Brian Cunniffe ◽  
Louis Passfield
Keyword(s):  
Field Test ◽  
Test Performance ◽  
Repeated Measures ◽  
Lactate Threshold ◽  
Laboratory Tests ◽  
Field Tests ◽  
Running Economy ◽  
Training Time ◽  
Repeated Measures Anova ◽  
Endurance Runners

Purpose:To examine the training and concomitant changes in laboratory- and field-test performance of highly trained endurance runners.Methods:Fourteen highly trained male endurance runners (mean ± SD maximal oxygen uptake [VO2max] 69.8 ± 6.3 mL · kg−1 · min−1) completed this 1-y training study commencing in April. During the study the runners undertook 5 laboratory tests of VO2max, lactate threshold (LT), and running economy and 9 field tests to determine critical speed (CS) and the modeled maximum distance performed above CS (D′). The data for different periods of the year were compared using repeated-measures ANOVA. The influence of training on laboratory- and field-test changes was analyzed by multiple regression.Results:Total training distance varied during the year and was lower in May–July (333 ± 206 km, P = .01) and July–August (339 ± 206 km, P = .02) than in the subsequent January–February period (474 ± 188 km). VO2max increased from the April baseline (4.7 ± 0.4 L/min) in October and January periods (5.0 ± 0.4 L/min, P ≤ .01). Other laboratory measures did not change. Runners’ CS was lowest in August (4.90 ± 0.32 m/s) and highest in February (4.99 ± 0.30 m/s, P = .02). Total training distance and the percentage of training time spent above LT velocity explained 33% of the variation in CS.Conclusion:Highly trained endurance runners achieve small but significant changes in VO2max and CS in a year. Increases in training distance and time above LT velocity were related to increases in CS.

Characteristics of Hydraulic Shock Waves in an Inclined Chute Contraction - Experiments

2009 ◽  
Vol 25 (2) ◽  
pp. 129-136 ◽  
Author(s):  
C.-D. Jan ◽  
C.-J. Chang ◽  
J.-S. Lai ◽  
W.-D. Guo
Keyword(s):  
Experimental Data ◽  
Shock Waves ◽  
Froude Number ◽  
Inclination Angle ◽  
Laboratory Experiments ◽  
Deflection Angle ◽  
Experimental Results ◽  
Regression Analyses ◽  
Hydraulic Shock ◽  
Empirical Relations

AbstractThis paper presents the experimental results of the characteristics of hydraulic shock waves in an inclined chute contraction with consideration of the effects of sidewall deflection angle φ, bottom inclination angle θ and approach Froude number Fr0. Seventeen runs of laboratory experiments were conducted in the range of 27.45° ≤φ≤ 40.17°, 6.22°≤ θ ≤ 25.38° and 1.04 ≤ Fr0 ≤ 3.51. Based on the experimental data, three empirical dimensionless relations for the shock angle, maximum shockwave height, and corresponding position of maximum shockwave were obtained by regression analyses, respectively. These empirical relations would be useful for hydraulic engineers in designing chute contraction structures.

scholarly journals Deformability Parameters of Varved Clays From the Iłów (Central Poland) Area Based on the Selected Field Tests

2017 ◽  
Vol 39 (1) ◽  
pp. 89-100 ◽  
Author(s):  
Piotr Zbigniew Zawrzykraj
Keyword(s):  
Land Surface ◽  
Vertical Profile ◽  
Test Procedure ◽  
Field Tests ◽  
Engineering Properties ◽  
Experimental Site ◽  
Pressuremeter Test ◽  
Research Profile ◽  
Dammed Lake ◽  
Different Parts

Abstract This publication presents the results of research carried out for the ice-dammed clays of the Iłów region, formed during Vistula glaciation. Pressuremeter tests, dilatometer tests and static probes were made. The tests were performed on the study site in Piskorzec near Iłów. In this region, ice-dammed clays are present almost from the land surface reaching the thickness of about 11 m. This site is the westernmost experimental site of clays of the “Warsaw Ice-Dammed Lake” among those presented in the literature. Research and their analysis showed differences in deformability due to the test procedure in connection with the structure of varved clays. Pressuremeter test, even though it is the most time consuming and challenging among the tests performed, allows the most complete characteristics of deformability of varved clays to be obtained. Vertical profile of clays being studied appears to be fairly homogeneous in terms of mechanical properties. Nevertheless, some parts of the profile clearly differ from the average values. This indicates the rate of post sedimentary changes varied in different parts of research profile. The data obtained are consistent with the values for ice-dammed clays from Radzymin and Sochaczew areas. Comparison of the engineering properties of varved clays to other experimental sites points to their similar geological history. It confirms that the experimental sites belong to one ice-dammed lake covering the areas of the Warsaw Basin.

Comparison of Sampling Techniques for Adult Mosquitoes and Other Nematocera in Open Vegetation2,3

1991 ◽  
Vol 26 (2) ◽  
pp. 231-236 ◽  
Author(s):  
A. R. Hoick ◽  
C. L. Meek
Keyword(s):  
Linear Regression ◽  
Body Length ◽  
Sampling Techniques ◽  
Empirical Equations ◽  
Mosquito Density ◽  
Coefficients Of Variation ◽  
Absolute Density ◽  
Regression Techniques ◽  
The Absolute ◽  
Sweep Net

Adult mosquitoes and other nematocerous flies (body length >2mm) were trapped in pastures using a sweep net and a motorized backpack aspirator. Absolute density was determined using a 0.1 m2 area sampler. Captures from each method at each absolute density were compared via linear regression techniques. Empirical equations were developed to estimate the absolute mosquito density. Sweep nets displayed higher R2 values and lower coefficients of variation than the aspirator.

scholarly journals Effects of Modified Multistage Field Test on Performance and Physiological Responses in Wheelchair Basketball Players

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Thierry Weissland ◽  
Arnaud Faupin ◽  
Benoit Borel ◽  
Serge Berthoin ◽  
Pierre-Marie Leprêtre
Keyword(s):  
Heart Rate ◽  
Field Test ◽  
Test Performance ◽  
Test Score ◽  
Minute Ventilation ◽  
Physiological Responses ◽  
Field Tests ◽  
Wheelchair Basketball ◽  
Basketball Players ◽  
And Performance

A bioenergetical analysis of manoeuvrability and agility performance for wheelchair players is inexistent. It was aimed at comparing the physiological responses and performance obtained from the octagon multistage field test (MFT) and the modified condition in “8 form” (MFT-8). Sixteen trained wheelchair basketball players performed both tests in randomized condition. The levels performed (end-test score), peak values of oxygen uptake(VO2peak), minute ventilation(VEpeak), heart rate(HRpeak), peak and relative blood lactate (Δ[Lact−] = peak – rest values), and the perceived rating exertion (RPE) were measured. MFT-8 induced higherVO2peakandVEpeakvalues compared to MFT (VO2peak: 2.5 ± 0.6 versus 2.3 ± 0.6 L·min−1andVEpeak: 96.3 ± 29.1 versus 86.6 ± 23.4 L·min−1;P<0.05) with no difference in other parameters. Significant relations betweenVEpeakand end-test score were correlated for both field tests(P<0.05). At exhaustion, MFT attained incompletelyVO2peakandVEpeak. Among experienced wheelchair players, MFT-8 had no effect on test performance but generates higher physiological responses than MFT. It could be explained by demands of wheelchair skills occurring in 8 form during the modified condition.

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