# Search Results

###### Experimental Study of the Effects of Flow Discharge, Diameter, and Depth on Shear Stress in a Rectangular Channel with Rigid Unsubmerged Vegetation

## Abstract

Shear stress is one of the most critical parameters in hydraulic and coastal engineering, which is often measured indirectly. Since there is no instrument to measure this parameter directly and given that it is usually calculated by measuring other parameters such as velocity and pressure and using some equations, shear stress measurement is often accompanied with large measurement errors. In this study, a new technique and direct measurement using physical modeling in a hydraulic knife-edge flume and load cell were employed to measure the shear stress in a rectangular channel with rigid unsubmerged vegetation with Dv= 20, 25, and 32mm in

Q=25 and 30 Lit/S and y=10, 12, 17, and 20 cm. The results indicate that the shear stress and the dimensionless

in vegetation diameter due to increasing vegetation density against flow. According to dimensionless ratios of

###### Effect of R, µ and T on the Fragility Curves for Two Spans Reinforced Concrete Highway Bridges

. Structural safety , 30(4): pp. 320-336. Wright, S., 1921. Correlation and causation. Journal of agricultural research, 20(7), pp. 557-585.

###### In-situ Measurements in Overconsolidated Clay

[4] Horvath T., Cambridge Insitu Ltd., Budapest Metro Line 4 Kelenfold Junction station & reversing facility addition site investigation: Text report Volume 1 and 2, Budapest, 2008 [5] Hudson J. A. , Stresses in rock masses; Processings of Eurock Conference , Dubrovnik, 2009 [6] Jaky J. , Talajmechanika, Budapest:Egyetemi Nyomda. 143pp., 1944 [7] Jaky J. , New theory of earth pressure. 2 nd ICSMFE , Rotterdam, 1948 [8] Jozsa V. , Empirical correlations of overconsolidation ratio, coefficient of earth pressure at rest and undrained

###### A Review of the Properties, Structural Characteristics and Application Potentials of Concrete Containing Wood Waste as Partial Replacement of one of its Constituent Material

, Y, NAIK, D. D. (2012). Studies on Correlation between Flexural Strength and Compressive Strength of Concrete, The Indian Concrete Journal, pp. 1 - 6. [76] OLUOKUN, F. A. (1991). Prediction of concrete tensile strength from its compressive strength: Evaluation of existing relationship for Normal Weight Concrete. ACI Materials Journal, Vol. 88, No. 3, pp. 302 - 309. [77] ATIS, C. D. (2005). Strength Properties of High-Volume Fly Ash Roller Compacted and Workable Concrete, and Influence of Curing Condition. Cement and Concrete Research

###### Bearing Capacity Investigation of Silty Sandy Soil Layer Using Kunzelstab Test

Kunzelstab Penetration Test” In: 5 th GEOINDO 2015 International Conference , Khon Kaen, Thailand. Geotechnical Engineering Research and Development (GERD), 2000, The Report Strength of Soil Layer in Footing Area. Kasetsart University, Bangkok, Thailand. Kaewwiset, N., Wiphathin, W. and Sootkhan, K., 2010. “The Correlation Between Engineering Properties of KKU soil and Results of Kunzelstab Penetration Test”, B.Eng. Project, Khon Kaen University, Khon Kaen, Thailand. Chanjeawchai, P., 2012. “Relationship between Kunzelstab number and unconfined

###### Identification of Collision Mechanism at Seismogenic Fault Interface Using Finite Element Analysis Involving Plate Bending Applications Using Ant Colony Optimization

Greece, Tectonophysics 188 , 403-405. Varotsos, P., Alexopoulos, K., and Lazaridou, M. (1993), Latest aspects of earthquake prediction in Greece based on Seismic Electric Signals II, Tectonophysics224 , pp. 1-37. Varotsos, P. A., Sarlis, N. V., and Skordas., E. S. (2002), Long-range correlations in the electric signals that precede rupture. Physical Review E, 66-1, 011902. Varotsos, P. A., Sarlis, N. V., Skordas, E. S. (2003a), Long-range correlations in the electric signals that precede rupture: Further investigations, Phys. Rev. E , 67 , 021109

###### Exploring the Energy Implication of Urban Density in Residential Buildings

## Abstract

In the context of the Algerian energy policy, and through the review of the Algiers’ residential building stock, this paper explores the correlation between the energy consumption of gas and electricity with urban density. Based on a holistic approach of the 57 Algiers’ municipalities, the analysis is organized in two ways. Firstly, the spatial approach is conducted within a GIS implementation, carried out based on the 2013 aggregated annual energy consumption data. The cross analysis of Electricity and Gas consumption and density of population within a GIS spatial distribution approach shows effectively a strong correlation between urban density and energy consumption with a Pearson correlation of −56% and −65% of the Electricity and Gas consumption in the urban municipalities, respectively. Also, the household located in the suburban municipalities consume clearly more energy than the urban centered ones. Based on the electricity and gas consumption, density and carbon footprint we have clustered, within a PCA, the Algiers’ municipalities into three profiles: the “thrifty”, the “intermediate” and the “wasteful” profile.

###### A Study of Groundwater Characteristics by Using of Groundwater Quality Index and Pollution Index in Zubair District, Basra Province, Iraq

## Abstract

The present work evaluated the groundwater quality index (GWQI) depending on some physicochemical analyses of thirteen groundwater samples in the Zubair district in Basra Province, Iraq. The collected groundwater samples were subjected to an extensive physicochemical analysis to evaluate the characteristics of water for drinking purpose according to Iraqi standard. For calculating the (GWQI), twelve water quality parameters were considered; turbidity, pH, chloride, total dissolved solids, total hardness (TH), electrical conductivity (EC), sodium, sulphate, phosphate, calcium, nitrate, and magnesium. The analysis of the results reveals that all the samples surpassed the portability of drinking water limits. High values of the (GWQI) in the obtained groundwater samples could possibly be caused by the higher values of electrical conductivity, total hardness, chloride, total dissolved solids and sodium within the groundwater. The calculated GWQI values ranged from 73.36 to 595.92. The pollution index (PI) was calculated for the study area with values ranged from 2.97 to 8.26. Correlation coefficients amongst the chosen water parameters exhibited some strong relationships. Finally, the analysis shows that the groundwater in this particular area needs to be treated before its consumption, and in addition, it usually needs to avoid the hazard of contamination. Principal component analysis (PCA) and cluster analysis (CA) indicate that the acquiring-data from groundwater samples are explained 90.5 % of the variance in the data with a four-component system that explains a large portion of the total variance of collected data.

###### Mathematical Modelling Of The Bridges Structural Monitoring II

## Abstract

We have seen in the previous paper that in the case of resistance elements made of steel, at least in this case study, the structure’s response to strains, in this case sunshine, is uncertain, may or may not be linear. The analysis continues for the four characteristic months of 2013, respectively the second month (February), the fifth (May), the eighth (August) and the event (November), covering the four seasons and approximately the entire range of temperatures to which the resistance elements of the bridge are subject to along a calendar year - case study Incheon Grand Bridge, Seoul, South Korea. The number of data pairs recorded, as we have noted, every 15 minutes, is initially 11,616, being difficult to process. Some software (e.g. Table Curve 2D) can work with a maximum of 3000 data pairs. In what follows we will examine the behaviour of a reinforced concrete element of the North Bridge Gap front line and we will build a mathematical model of its behaviour to sunshine, from the input data, one recording every hours, thus reducing the number of measurements to 2904. The aim is to obtain a mathematical model with a correlation coefficient above 0.9, which is also verified and validated. This model will allow us to calculate the expected position of the sensor mounted on the resistance element for a certain temperature, the degree of confidence of the result, the interval of residual values. Because the history of the evolution of temperatures for each moment analyzed is different it produces different results, but ones that fit the specified regressive mathematical model.

###### The Impact of Carbon Dioxide Concentration on the Human Health - Case Study

. Slovak Standard - European Norm, pp. 51. Herberger, S., Herold, M., Ulmer, H., Burdack-Freitag, A., Mayer, F., 2010. Detection of human effluents by a MOS gas sensor in correlation to VOC quantification by GC/MS. Building Environment , 45, pp. 2430-2439. Kapalo, P., Vilcekova, S., Vozniak, O., 2014. Using Experimental Measurements of the Concentrations of Carbon Dioxide for Determining the Intensity of Ventilation in the Rooms. Chemical Engineering Transactions , 39, pp. 1789-1794. Lis, A., Ujma, A., 2014. Changes in the External Environment and of