Despite the developments of sectors which aim at valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that mu...Despite the developments of sectors which aim at valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that must be proven over the long term. The purpose of this study is to understand the modification of the hydromechanical properties of bottom liners of landfills that may occur during their exploitation under leachate action. To do so, on the basis of its parameters of nature, a swelling clay from Burkina Faso is selected from soils of seven localities in Burkina Faso (West Africa). Laboratory tests carried out with distilled water and then with a young synthetic leachate show a degradation of the permeability of this clay from 2.42 × 10^-10 m/s to 1.01 × 10^-9 m/s. In addition, leachate leads to an inhibition of the swelling and a remarkable increase of its compressibility, inducing significant settlement. With the increase in permeability, the primary consolidation settlement is increasing faster. Changes in the hydromechanical behavior can be attributed to the clays mineralogy, mainly cation exchange and the development of the diffuse double layer.展开更多
Objectives:The aim of this study was to explore factors that motivate students to engage in skills practice in a laboratory setting,and to identify their motivation types and the regulatory styles.Methods:Semi-structu...Objectives:The aim of this study was to explore factors that motivate students to engage in skills practice in a laboratory setting,and to identify their motivation types and the regulatory styles.Methods:Semi-structured interviews were conducted with 23 nursing students from three universities between November 2017 and January 2018.A thematic analysis was used to identify factors associated with students’motivation to engage in skills practice in a laboratory.The types and the regulatory styles of student motivation were identified based on the self-determination theory.Results:Seven motivating factors were identified.These factors included the students’desire“to acquire the skills necessary to work as a nurse”,the“desire to improve skills in preparation for clinical practicum”,and their felt“obligations to patients as a nurse”.Moreover,“the impetus to study arising from the objective evaluation of oneself and others”and“wanting to pass the skills examination”motivated the students to engage in skills practice.A“learning environment that facilitates students’learning”and the“supportive involvement of educators”facilitated their learning.Based on the self-determination theory,the students were found to embrace extrinsic motivation with four regulatory styles of motivation,namely integrated,identified,introjected,and external regulation.Conclusions:Nurse educators should understand the motivating factors of students,and help students embrace a more internally controlled motivation by helping them envision their future careers as nurses,and by fostering their ethical duty to care for patients.展开更多
CFD (computational fluid dynamics) is following the trend of CAD and FEA (finite element analysis) to undergraduate education especially with recent advances in commercial codes. It will soon take its place as an ...CFD (computational fluid dynamics) is following the trend of CAD and FEA (finite element analysis) to undergraduate education especially with recent advances in commercial codes. It will soon take its place as an expected skill for new engineering graduates. CFD was added as a component to an experiment in a junior level fluid mechanics course. The objectives were to introduce CFD, as an analysis tool, to the students and to support the theoretical concepts of the course. The students were asked to complete an experimental two-dimensional study for a wing in a wind tunnel, to use CFD to simulate the flow, and to predict the aerodynamic lift using CFD as well as the experimentally obtained pressure distribution. In addition, they had to compare their results to published data for the studied wing. Details of the course, the wind tunnel test and the CFD simulations are presented. Samples from the students' work are used in the discussion. The lab activities were successfully completed by the students and the learning objectives were well addressed. One of the valuable outcomes from this lab was the opportunity for the students to integrate multiple fluid mechanics analysis tools and learn about the limits for each tool. CFD also enhanced the learning in the lab activities and increased students' interest in the subject.展开更多
The major restriction for learning in science and engineering education in Africa is the absence of equipped laboratories. Where laboratory is available, there is the problem of obsolete and antiquated materials, whic...The major restriction for learning in science and engineering education in Africa is the absence of equipped laboratories. Where laboratory is available, there is the problem of obsolete and antiquated materials, which are seldom available for use. In most Universities in Africa, there is inadequate supply of laboratory space and laboratory materials. The laboratories only have the items of equipment that were provided when the universities were established, this has hampered learning. An alternative educational approach is required to address the aforementioned problems and provide a cost-effective solution for education as well as a valuable complementary or learning tool for university students. The alternative approach is the use of Virtual Reality (VR) technology to simulate virtual learning environments such as virtual reality laboratories. This is a one solution to inadequate physical laboratories in Africa.展开更多
文摘Despite the developments of sectors which aim at valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that must be proven over the long term. The purpose of this study is to understand the modification of the hydromechanical properties of bottom liners of landfills that may occur during their exploitation under leachate action. To do so, on the basis of its parameters of nature, a swelling clay from Burkina Faso is selected from soils of seven localities in Burkina Faso (West Africa). Laboratory tests carried out with distilled water and then with a young synthetic leachate show a degradation of the permeability of this clay from 2.42 × 10^-10 m/s to 1.01 × 10^-9 m/s. In addition, leachate leads to an inhibition of the swelling and a remarkable increase of its compressibility, inducing significant settlement. With the increase in permeability, the primary consolidation settlement is increasing faster. Changes in the hydromechanical behavior can be attributed to the clays mineralogy, mainly cation exchange and the development of the diffuse double layer.
基金supported by JSPS KAKENHI(Grant Number 17K12147).
文摘Objectives:The aim of this study was to explore factors that motivate students to engage in skills practice in a laboratory setting,and to identify their motivation types and the regulatory styles.Methods:Semi-structured interviews were conducted with 23 nursing students from three universities between November 2017 and January 2018.A thematic analysis was used to identify factors associated with students’motivation to engage in skills practice in a laboratory.The types and the regulatory styles of student motivation were identified based on the self-determination theory.Results:Seven motivating factors were identified.These factors included the students’desire“to acquire the skills necessary to work as a nurse”,the“desire to improve skills in preparation for clinical practicum”,and their felt“obligations to patients as a nurse”.Moreover,“the impetus to study arising from the objective evaluation of oneself and others”and“wanting to pass the skills examination”motivated the students to engage in skills practice.A“learning environment that facilitates students’learning”and the“supportive involvement of educators”facilitated their learning.Based on the self-determination theory,the students were found to embrace extrinsic motivation with four regulatory styles of motivation,namely integrated,identified,introjected,and external regulation.Conclusions:Nurse educators should understand the motivating factors of students,and help students embrace a more internally controlled motivation by helping them envision their future careers as nurses,and by fostering their ethical duty to care for patients.
文摘CFD (computational fluid dynamics) is following the trend of CAD and FEA (finite element analysis) to undergraduate education especially with recent advances in commercial codes. It will soon take its place as an expected skill for new engineering graduates. CFD was added as a component to an experiment in a junior level fluid mechanics course. The objectives were to introduce CFD, as an analysis tool, to the students and to support the theoretical concepts of the course. The students were asked to complete an experimental two-dimensional study for a wing in a wind tunnel, to use CFD to simulate the flow, and to predict the aerodynamic lift using CFD as well as the experimentally obtained pressure distribution. In addition, they had to compare their results to published data for the studied wing. Details of the course, the wind tunnel test and the CFD simulations are presented. Samples from the students' work are used in the discussion. The lab activities were successfully completed by the students and the learning objectives were well addressed. One of the valuable outcomes from this lab was the opportunity for the students to integrate multiple fluid mechanics analysis tools and learn about the limits for each tool. CFD also enhanced the learning in the lab activities and increased students' interest in the subject.
文摘The major restriction for learning in science and engineering education in Africa is the absence of equipped laboratories. Where laboratory is available, there is the problem of obsolete and antiquated materials, which are seldom available for use. In most Universities in Africa, there is inadequate supply of laboratory space and laboratory materials. The laboratories only have the items of equipment that were provided when the universities were established, this has hampered learning. An alternative educational approach is required to address the aforementioned problems and provide a cost-effective solution for education as well as a valuable complementary or learning tool for university students. The alternative approach is the use of Virtual Reality (VR) technology to simulate virtual learning environments such as virtual reality laboratories. This is a one solution to inadequate physical laboratories in Africa.