scholarly journals Effect of explosive charge-blast distance interaction on ground damage (Boukhadra mine, Algeria)

2018 ◽  
pp. 57-64
Author(s):  
O. Kamli ◽  
A. Boutaleb ◽  
M.C. Djouama ◽  
M. Hacini
Keyword(s):  
Explosive Charge ◽  
Ground Damage ◽  
Distance Interaction

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

Explosive Removal of Concrete From Reinforced Walls

2007 ◽  
Author(s):  
Denis D. Rickman ◽  
John Q. Ehrgott ◽  
Stephen A. Akers ◽  
Jon E. Windham ◽  
Dennis W. Moore
Keyword(s):  
Explosive Charge ◽  
Research Effort ◽  
Us Army ◽  
Steel Reinforced Concrete ◽  
The Past ◽  
The Us ◽  
Development Center ◽  
The Relationship ◽  
Improved Methods ◽  
Combat Environment

During the past several years, the US Army has focused considerable attention toward developing improved methods for breaching walls in the urban combat environment. A major thrust area is centered on finding improved methods to breach the toughest wall type that Army units are likely to face: a double (steel) reinforced concrete (RC) wall. One impediment to this effort is that the relationship between the contact explosive charge configuration and the quantity of concrete removed has not been thoroughly understood. The U.S. Army Engineer Research and Development Center has conducted a research effort to better define the effectiveness of various explosive charge configurations in breaching RC walls. This paper presents a discussion of results from this research.

Seismic microzoning in New Zealand

1971 ◽  
Vol 4 (1) ◽  
pp. 43-50
Author(s):  
W. R. Stephenson
Keyword(s):  
New Zealand ◽  
Structural Damage ◽  
Seismic Waves ◽  
Multiple Reflection ◽  
Ground Failure ◽  
Seismic Microzoning ◽  
Popular View ◽  
Wave Trains ◽  
Local Geology ◽  
Ground Damage

"Seismic Microzoning" means many different things to different people. There is always included the element of different damage in nearby areas, but how the differences arise, how we should study them, and how we should apply the results of our studies, are still uncertain. To some people, microzoning refers to structural damage due to ground failure; faulting, slumping and liquefaction all belong in this category. To others, microzoning is the effects of the focussing of seismic waves by boundaries, resulting in modified ground damage and building damage. A third very popular view of microzoning holds that it concerns multiple reflection of seismic waves in layers, with interference of the wave trains giving rise to maxima, where ground and structural damage will be accentuated. Microzoning can be defined as the division of land areas into small regions of differing local geology for which differences in earthquake attack on structures are specified. This paper is an attempt to set down aspects of microzoning in a logical manner, and to relate them. It also discusses activities here and overseas, and considers where microzoning and microzoning research in New Zealand should head.

Using digital tools during dista nce learning: teacher experience

2021 ◽  
pp. 22-31
Author(s):  
I. N. Shegai
Keyword(s):  
Digital Tools ◽  
Educational Institutions ◽  
Traditional Learning ◽  
Learning Technology ◽  
Practicing Teachers ◽  
New Methods ◽  
Communication Program ◽  
Offline Learning ◽  
Interactive Exercises ◽  
Distance Interaction

Due to the situation caused by the coronavirus COVID-19, educational institutions were forced to switch to a mode of distance interaction with students. The proposed material presents the range of digital tools successfully used by the teacher during the period of distance learning, as well as proposed for use in the traditional learning mode in the perspective of the use of blended learning technology. Among the tools, attention is paid primarily to educational platforms, portals, electronic notebooks, services for creating interactive exercises, quests, quizzes, and video sessions. Several variants of virtual whiteboards are offered for use, and attention is also drawn to the possibility and feasibility of using MOOC in school. As examples, the methodological techniques implemented in the lessons during the distance in the Zoom communication program are given. The use of digital tools in school education allows you to create, implement and distribute new methods of teaching and working with children, improve educational approaches, and further combine the possibilities of online and offline learning. The article will be relevant for practicing teachers and researchers whose interests lie in the field of digitalization of education.

scholarly journals Experimental studies of geomechanical processes in hard rock massif during blasting of explosive charge in different crosscut shape

2014 ◽  
Vol 8 (3) ◽  
pp. 373-379
Author(s):  
K Ishchenko ◽  
◽  
S Konoval ◽  
I Kratkovskyi ◽  
V Krukovska ◽  
...  
Keyword(s):  
Explosive Charge ◽  
Hard Rock ◽  
Experimental Studies ◽  
Rock Massif

scholarly journals Efek Penggunaan Lahan Terhadap Degradasi Tanah Pada Kebun Campuran Di Kecamatan Kairatu Kabupaten Seram Bagian Barat Propinsi Maluku

Agrologia ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Silwanus M Talakua ◽  
Rafael M Osok
Keyword(s):  
Land Use ◽  
Land Degradation ◽  
Soil Degradation ◽  
Influential Factors ◽  
Influential Factor ◽  
Vegetation Density ◽  
Damage Indicator ◽  
Ground Damage

Land use is the most influential factor in soil degradation due to erosion. The objectives of this research are to know the level of land degradation and the factors that influence the land use area, the upper vegetation density and the lower vegetation density. This research uses the method of measuring ground damage indicator in the field. The results showed that single, wide land use, upper vegetation density and lower vegetation density had an effect on soil degradation on mixed garden land use; while simultaneously, wide land use, upper vegetation density and lower vegetation density have an effect on soil degradation on mixed garden land use. The most influential factors for soil degradation in mixed gardens are the area of land use and lower vegetation density.Keyword:  Degradation of soil, land, vegetation density, mixed gardens.

scholarly journals Research on Damage Characteristics of Brick Masonry under Explosion Load

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jifeng Wei ◽  
Zhixin Du ◽  
Yonghui Zheng ◽  
Oundavong Ounhueane
Keyword(s):  
Power Function ◽  
Explosive Charge ◽  
Masonry Wall ◽  
Pressure Vessels ◽  
Brick Masonry ◽  
Ejection Velocity ◽  
Load Bearing ◽  
Damage Characteristics ◽  
Explosion Load ◽  
The Relationship

As the main structural component of partition wall or load-bearing wall, brick masonry has been widely used in construction engineering. However, brick and mortar are all brittle materials prone to crack. Nowadays, fireworks, gas stoves, high-pressure vessels, and other military explosives may explode to damage nearby structures. Many explosion casualties had shown that the load-bearing capacity of brick masonry decreased dramatically and cracks or fragments appeared. Previous studies mainly focused on noncontact explosion in which shock wave is the main damage element. In fact, the response and damage effect of brick masonry wall under contact explosion are more complex, which attracts more attention now. In order to explore the damage characteristics of brick masonry under explosion load, a series of simulations and verification experiments are conducted. RHT and MO granular material models are introduced to describe the behaviour of brick and masonry, respectively, in simulation. The combination effect of front compressive wave and back tensile wave are main factors influencing the breakage of masonry wall. The experimental results are well in accordance with the simulation results. The front cross section dimension of crater is closely related to the radius of spherical explosive charge. A power function predictive model is developed to express the relationship between the radius of hole and the radius of explosive. Furthermore, with increasing the quantity of explosive charge, the number and ejection velocity of fragments are all increased. The relationship between maximum ejection velocity and the quantity of explosive also can be expressed as a power function model.

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