Laboratory study on the effects of hydraulic and granulometric parameters on the response of granular soil to internal erosion

Erosion is a major environmental problem to agricultural land as well as to civil engineering infrastructures. Rainwater infiltration into granular soils can lead to the migration of fine particles by suffusion. This experimental study is conducted to evaluate the susceptibility to erosion of cohesionless soils. The soil under investigation was collected from the coastal region of Mostaganem (West of Algeria) where erosion has recently caused several damages. To assess soil instability to erosion, two approaches have been proposed in the literature: the geometric approach and the hydraulic approach. Few studies have examined the combination of the two methods. The objective of our study is the combination of the two approaches by determining the critical hydraulic load responsible for triggering erosion as a function of soil characteristics. An experimental parametric study was conducted to determine the influence of initial amount of fines, hydraulic gradient and axial stress on the initiation and evolution of suffusion. A combination of the interactions between these parameters allowed us to express the critical hydraulic gradient and to identify the hydraulic behavior of the soil according to the studied parameters. This approach can better estimate the erodibility of cohesionless soils. It can be used in future development studies at this site to reduce the risk of erosion

Automation of the Client Side of Web Services Using PHP

Web Services have been the dominant technology in business integration and implementation of service oriented architectures. PHP is a server-side language popular for development of applications. A significant advantage of PHP is its light weight development for feature-rich web applications. Typically, PHP is used for making good-looking front end user interfaces; Java or other programming languages are used to develop the back end application. A secure and robust way for PHP programs to call back-end services is by Web Services. However, when the Web Service operations have complex interfaces, writing PHP client code can be difficult and error-prone. This thesis research seeks to develop a Web service-PHP program middleware that automatically handles the client-side Web Service calls. Two Web Services are developed, as well as two Web applications that consume the two Web Services, and experiments that demonstrate the usage of the WS-PHP middleware component are conducted

HUBUNGAN ASUPAN PROTEIN, LEMAK, KALIUM DAN MAGNESIUM DENGAN TEKANAN DARAH SISTOLIK DAN DIASTOLIK LANJUT USIA

Latar belakang : Hipertensi merupakan salah satu penyakit degeneratif yang prevalensinya semakin meningkat. Salah satu faktor yang mempengaruhi tekanan darah adalah asupan protein, lemak, kalium, dan magnesium. Tujuan penelitian ini adalah untuk mengetahui hubungan asupan protein, lemak, kalim,dan magnesium dengan tekanan darah pada lansia. Metode : Penelitian cross-sectional ini diikuti oleh 42 subjek (60-80 tahun) dari anggota PWRI (Persatuan Wredatama Republik Indonesia) ranting Semarang Selatan di Semarang. Asupan protein, lemak, kalim, dan magnesium diperoleh dengan menggunakan recall 3x24 jam. Tekanan darah diukur dengan menggunakan Sphygmomanometer air raksa. Analisis bivariat dilakukan dengan uji korelasi Rank-Spearman. Hasil : Pada penelitian ini sebanyak 83.3% subjek mengalami hipertensi. Asupan protein (52.4%), lemak (100%), kalium (54.8%), dan magnesium (95.2%) subjek kurang dari kebutuhan. Analisis bivariat menunjukkan tidak ada hubungan antara asupan protein, lemak, kalium, dan magnesium dengan tekanan darah sistolik dan diastolik. Simpulan : Tidak terdapat hubungan antara asupan protein, lemak, kalium dan magnesium dengan tekanan darah sistolikdan diastolik

Paul Römer’s 90 Model and South Korean Economic Growth: An Econometric Study

This study aims to apply Paul Römer’s 90 model of economic growth on the case of South Korea during the period 1979-2018 using an econometric study. The study concluded that the labor force has a positive impact on the GDP and this effect increases in the long run by 5 doubles during the study period. For patents, their impact has increased also by 7.46 doubles. While the effect of capital accumulation decreased in the long run. We conclude that the human factor and patents have played a large role in the long run economic growth as stated in the Römer model

Laboratory study on the effects of hydraulic and granulometric parameters on the response of granular soil to internal erosion

Erosion is a major environmental problem to agricultural land as well as to civil engineering infrastructures. Rainwater infiltration into granular soils can lead to the migration of fine particles by suffusion. This experimental study is conducted to evaluate the susceptibility to erosion of cohesionless soils. The soil under investigation was collected from the coastal region of Mostaganem (West of Algeria) where erosion has recently caused several damages. To assess soil instability to erosion, two approaches have been proposed in the literature: the geometric approach and the hydraulic approach. Few studies have examined the combination of the two methods. The objective of our study is the combination of the two approaches by determining the critical hydraulic load responsible for triggering erosion as a function of soil characteristics. An experimental parametric study was conducted to determine the influence of initial amount of fines, hydraulic gradient and axial stress on the initiation and evolution of suffusion. A combination of the interactions between these parameters allowed us to express the critical hydraulic gradient and to identify the hydraulic behavior of the soil according to the studied parameters. This approach can better estimate the erodibility of cohesionless soils. It can be used in future development studies at this site to reduce the risk of erosion

EFFECT OF Salsola vermiculata

Algerian aride zone is rich with medicinal plant, Salsola vermiculata is one of the mosttraditional plant remedies in Bechar region. in this work, we tried to test the inhibitory effect on eight storage soft wheat fungi of various extracts of Salsola vermiculata in vitro and vivo by using grain storage by the coating method. The phytochemical screening of plants showed the detection of tannins, saponisides and flavonoids. The results show a remarkable antifungal effect by most of the extracts tested. The  decrease in the level of fungi observed in wheat samples demonstrates the effectiveness of grain storage by the coating method.Keywords: Salsola vermiculata; Antifungal activity; Coating method; Fungi; soft wheat;Storage

New Separation Techniques for Output-Only Modal Analysis

The paper is devoted to the problem of discriminating between operational and natural modes of structures excited by generic inputs. This case often occurs when the system under analysis holds rotating parts and is contemporary excited by ambient noise; in this case the output-only techniques may fail being easily trapped in a misinterpretation of the system eigenvalues. A survey of the methods available in literature is given, together with the explanation of their failures. To solve this problem, two new techniques are introduced and their capabilities are checked with numerical and experimental data from a paper machine

Toothed gearing vibrations analysis : cepstrum, correlation, spectrum

This paper presents the application of cepstral analysis to the vibrations of a toothed gearing . The signal is modeled as an amplitude modulated oscillation and the effect of cepstrum is detailed . Cepstrum and autocorrelation are compared and the resolution of cepstrum is discussed .Cet article présente une application de l'analyse par le cepstre à l'étude des vibrations d'un engrenage. Une modélisation des signaux d'engrenage est utilisée pour détailler l'action du cepstre et la comparer avec celle de l'autocorrélation. Le lien entre la résolution du cepstre et les caractéristiques du signal est mis en évidenc

On the evaluation of the interfacial tension of immiscible binary systems of methane, carbon dioxide, and nitrogen-alkanes using robust data-driven approaches

Gas injection has emerged over the recent decades as a promising technology to enhance oil recovery in various fields worldwide. The efficiency and success of a gas injection operation can be assessed through a number of vital experimental studies. Interfacial Tension (IFT) between the injected gas and the displacing fluid is a key parameter playing an eminent role in the foregoing studies. The main scope of this work is making a progress in modeling the IFTs between diverse n-alkanes and Methane (CH4), Carbon Dioxide (CO2), and Nitrogen (N2) natural gases. For this purpose, two smart AI-based approaches of Cascaded Feedforward Neural Network (CFNN) and Decision Tree Learning (DT) were used to simultaneously model the IFTs between foregoing immiscible binary systems as a function of pressure, temperature, the gases properties, and the properties of the liquid. Several statistical measures and graphical descriptions were employed to aid the accuracy analysis of the proposed models. Both developed CFNN and DT networks represented desirable close-to-reality predictions in all binary systems. Besides, CFNN established itself as the most robust model for all studies binary systems with RMSE values of 0.5924, 0.5649, and 0.5870 mN/m, and R2 values of 0.9902, 0.9910, and 0.9904 for the train, test, and overall data, respectively

On numerical modeling of couple heat, air and moisture transfer through multilayered walls

This paper reports on numerical modeling of heat, air, and moisture transfer through multilayered walls. Building materials are often subjected to temporal climatic variations, which can induce a transfer of heat and moisture through the walls of the building and the foundation soil. These materials are generally considered as porous media. The coupled heat, air and moisture transfer in building materials is of paramount importance in the construction area. In this way, a mathematical model has been elaborated and validated using a benchmark example. Here, we aim to determine the energy losses. The capillary pressure is considered as potential moisture which represents both the transport of vapor and liquid phases of the water. Basing on basic functions of partial differential equations, one can convert certain measurable properties of porous media as coefficients depending on the temperature and the capillary pressure. The results obtained compare favorably with other available in the literature