scholarly journals Defects of the building and its remediation – Case study: Elementary school Vodňany

2019 ◽  
Vol 279 ◽  
pp. 03013
Author(s):  
Martin Dědič
Keyword(s):  
Elementary School ◽  
Structural Damage ◽  
Vertical Deformation ◽  
Foundation Soil ◽  
Load Bearing ◽  
Current State ◽  
Soil Sediment ◽  
Actual Damage ◽  
The Stability

The aim of the paper is to provide information on the defects in the construction of the elementary school in Vodňany. The building of the elementary school dates back to 1973. It is a reinforced concrete columns skeleton with a filling peripheral and internal dividing brick masonry. The object is used by the primary school and is permanently used and maintained. The extent of structural damage is stabilized in the current state and is not an immediate risk to the user of the object. It concerns only non-load-bearing structures (floor and partitions), the vertical load-bearing structures do not show a decrease and therefore the stability of the whole building is not compromised. However, actual damage complicates operation of elementary school and is very non-aesthetic. Concurrent damage to structures is the result of vertical deformation of the foundation soil. Vertical deformation of the foundation soil - sediment is the result of the building construction on a former creek which was not properly excavated and covered with a suitable backfill. Subsidence further strengthens imperfect drained rainwater from the roof of the building and leakage of rainwater drains.

Marriage and Morality among the Adioukrou

1990 ◽  
Vol 18 (3) ◽  
pp. 329-336
Author(s):  
Harriet Hill
Keyword(s):  
Ivory Coast ◽  
Final Section ◽  
The Past ◽  
Current State ◽  
Diachronic Study ◽  
The Stability ◽  
State Of Affairs ◽  
Biblical Teaching ◽  
Significant Factors

Marriage and traditional morals have changed drastically for the Adioukrou of Ivory Coast in the past forty years. Many Adioukrou are concerned by the breakdown in family structure. While it is typical that rapid culture change threatens the stability of societies, one must ask why biblical teaching on marriage and morality has not filled the void in this group that has identified itself as Christian over the past seventy years. This paper is a diachronic study which traces significant factors that have led to the current state of affairs. The final section recommends a plan of action. It is hoped that this case study will address the concerns that many other cultures are facing.

scholarly journals Implementación electrónica del oscilador caótico de Rӧssler

2020 ◽  
pp. 18-25
Author(s):  
Alejandro Silva-Juárez ◽  
Jaime Estevez-Carreón ◽  
Juan Jorge Ponce-Mellado ◽  
Gustavo Herrera-Sánchez
Keyword(s):  
Secure Communication ◽  
Communication Systems ◽  
Structural Damage ◽  
Random Number Generators ◽  
Analog Electronics ◽  
Potential Applications ◽  
The Stability ◽  
Electronic Implementation

Chaotic systems have attracted the attention of the scientific community due to their potential applications in many branches of science and engineering, chaos theory is used in cryptography, in the creation of population models in biology, studying turbulence in mechanics of fluids, in economics it is used to predict the behavior of the stock market, in astronomy it is used to describe the motion of many planetary bodies, to improve the prediction of trajectories in asteroids and to determine whether or not they come into contact with the earth, in More recent years have been applied in the prediction and / or control of the dynamics of the human brain, a large number of works have been reported in different areas in order to address some interesting problems, such as the determination of structural damage in materials or in secure communication systems. In this work the implementation of chaotic oscillators in analog electronics is addressed, the case study of the autonomous non-linear dynamic system of Rӧssler is presented, the stability analysis of the system is developed, analytical, numerical and experimental results are included, as well as its Electronic implementation measured under laboratory conditions to observe experimental chaotic attractors, which will be used in the implementation of random number generators and secure communication systems for image encryption.

scholarly journals Vertical Expansion Stability of an Existing Landfill: A Case Study of a Landfill in Xi’an, China

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hui Sheng ◽  
Yinbang Ren ◽  
Man Huang ◽  
Zhenying Zhang ◽  
Jiwu Lan
Keyword(s):  
Factor Of Safety ◽  
Slip Surface ◽  
Slope Instability ◽  
Stability Factor ◽  
Foundation Soil ◽  
Instability Modes ◽  
Leachate Level ◽  
The Stability ◽  
Leachate Water

The vertical expansion of existing landfills can hold significant amounts of domestic waste and solve practical difficulties such as local government site selection. This research topic has become increasingly popular in the field of environmental geotechnical engineering. This study examined vertical expansion stability of landfills considering high leachate water level. The results showed the following. (1) Four slope instability modes for landfill vertical expansion are categorized according to the following slip surface positions: shallow slippage of the existing landfill, shallow slippage of the expanding landfill, interface slip between the existing landfill and expanding landfill, and deep slippage passes through the foundation soil. (2) The factor of safety decreases as the height of leachate level increases. When the height of leachate level rises from 2 m to 20 m, the factor of safety of the landfill is reduced by 13.2–15.4%. (3) As the vertical expansion height increases, the factor of safety of the existing landfill decreases, and when the expansion height increases to 30 m, the stability factor of safety of the old waste landfill is reduced by 4.83%. A landfill in Xi’an is considered as an example for the analysis, which shows that a leachate drainage layer can discharge leachate from the landfill body efficiently, reduce the leachate level height of the landfill body, and improve the stability of vertical expansion of the landfill. This study and its findings can be used as a reference for similar expansion projects.

scholarly journals Stability Constrained Characterization of Multiplanet Systems

2020 ◽  
Author(s):  
Daniel Tamayo ◽  
Christian Gilbertson ◽  
Daniel Foreman-Mackey
Keyword(s):  
System Stability ◽  
Outer Planets ◽  
Current State ◽  
Upper Limits ◽  
The Stability ◽  
Parameter Ranges ◽  
The Masses ◽  
Practical Recommendations

Abstract Many discovered multiplanet systems are tightly packed. This implies that wide parameter ranges in masses and orbital elements can be dynamically unstable and ruled out. We present a case study of Kepler-23, a compact three-planet system where constraints from stability, transit timing variations (TTVs), and transit durations can be directly compared. We find that in this tightly packed system, stability can place upper limits on the masses and orbital eccentricities of the bodies that are comparable to or tighter than current state of the art methods. Specifically, stability places 68% upper limits on the orbital eccentricities of 0.09, 0.04, and 0.05 for planets b, c and d, respectively. These constraints correspond to radial velocity signals ≲ 20 cm/s, are significantly tighter to those from transit durations, and comparable to those from TTVs. Stability also yields 68% upper limits on the masses of planets b, c and d of 2.2, 16.1, and 5.8 M⊕, respectively, which were competitive with TTV constraints for the inner and outer planets. Performing this stability constrained characterization is computationally expensive with N-body integrations. We show that SPOCK, the Stability of Planetary Orbital Configurations Klassifier, is able to faithfully approximate the N-body results over 4000 times faster. We argue that such stability constrained characterization of compact systems is a challenging “needle-in-a-haystack” problem (requiring removal of 2500 unstable configurations for every stable one for our adopted priors) and we offer several practical recommendations for such stability analyses.

Importance of Video Aids’ Usage in Teaching and Learning Process of English Language Classes

2015 ◽  
Vol 1 (3) ◽  
pp. 160 ◽  
Author(s):  
Eriselda Vrapi ◽  
Xhevdet Zekaj
Keyword(s):  
Elementary School ◽  
Teaching And Learning ◽  
English Language ◽  
English Language Teaching ◽  
Main Hypothesis ◽  
Communicative Skills ◽  
English Curriculum ◽  
9Th Grade ◽  
8Th Grade

This study aims to explore the use of video in English language teaching (ELT) elementary school (grades 8 to 9)... In addition, the thesis aims to find out how videos in English lessons helped to achieve the goals of English curriculum. The main hypothesis was that teaching with video would develop pupils’ communicative skills and, therefore, was appropriate for the communicative approach to ELT. The study addressed five research questions regarding the use of videos in English lessons in the case study school: why the teachers used videos in ELT, what kinds of videos were used in English lessons, how and how often videos were used, what was taught and learned through the use of videos and, finally, what the teachers’ and pupils’ attitudes to lessons with videos were. The research was performed as a case study at an Elbasan elementary school. The data for the research was obtained through the use of mixed methods: qualitative, in the form of interviews with four English teachers and observations of three of the interviewed teachers’ lessons with videos, and quantitative, in the form of a pupil questionnaire answered by 105 pupils from two 8th grade and two 9th grade classes.

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