scholarly journals Aplikasi Geofoam Sebagai Material Timbunan di Atas Tanah Lunak

2011 ◽  
Vol 2 (1) ◽  
pp. 106
Author(s):  
Irpan Hidayat ◽  
Andryan Suhendra
Keyword(s):  
Theoretical Analysis ◽  
Eastern Europe ◽  
Field Test ◽  
Expanded Polystyrene ◽  
Soft Ground ◽  
Laterite Soil ◽  
Fill Material ◽  
Low Weight ◽  
Weight Property ◽  
Preliminary Research

Geofoam is a geosintetik material made of Expanded Polystyrene (EPS) and Xtruded Polystyrene (XPS), which has a low weight property which makes geofoam widely used as a lightweight fill material and has been applied in Europe, especially in Eastern Europe. This is a preliminary research that emphasizes on the use of geofoam as a fill material on soft ground through theoretical analysis using Plaxis program. Supporting data used covers data of basic and fill ground taken from specific locations which are planned for subsequent research as a field test. Based on the Plaxis program results, the use of geofoam as a fill material give a higher safety factor value with a smaller deformation compared to laterite soil. This result indicates that the use of geofoam as a fill material can be considered to be applied in the country. 

Deutscher, Lenin and the East-European Perspectives

2017 ◽  
Vol 25 (2) ◽  
pp. 3-28
Author(s):  
Tamás Krausz
Keyword(s):  
Theoretical Analysis ◽  
Eastern Europe ◽  
Historical Development ◽  
Historical Context ◽  
October Revolution ◽  
State Socialism ◽  
Eastern European ◽  
East European ◽  
Marxist Analysis

The article introduces the reception of Isaac Deutscher’s work in Eastern Europe in a historical context and shows how deeply this reception was connected to the various transformations of the system, which had been established after the victory of the Russian October Revolution. The author gives a Marxist analysis of the historical development of state socialism and the various changes in Eastern-European Marxist thought which accompanied this history. He belongs to that school of thought which defines this system as state socialism, and he gives a theoretical analysis of its main characteristics, adding that 1989 failed to fulfil the expectations and hopes of many Western and Eastern-European Marxists.

Impact performance of innovative corrugated polystyrene foam for bicycle helmets

2020 ◽  
pp. 0021955X2096521
Author(s):  
Somen K Bhudolia ◽  
Goram Gohel ◽  
Kah Fai Leong
Keyword(s):  
Energy Absorption ◽  
High Speed ◽  
Head Injuries ◽  
Expanded Polystyrene ◽  
The Novel ◽  
Comparison Study ◽  
Impact Performance ◽  
Bicycle Helmets ◽  
Weight Property ◽  
The Impact

Expanded Polystyrene (EPS) is a common material used to manufacture the inner foam liner of a bicycle helmet due to its outstanding energy absorption characteristics and light-weight property. The current research presents a novel corrugated expanded polystyrene (EPS) foam design concept which is used to enhance the impact dissipation of bicycle helmets from the safety standpoint to reduce head injuries and make them lighter. The baseline comparison study under impact for different foam configurations is compared with a conventional EPS foam sample without corrugation. Corrugated foam designs under current investigation are 12.5–20% lighter and provide up to 10% higher energy absorption. The details of the novel manufacturing concept, CPSC 1203 helmet impact tests, high-speed camera study to understand the differences in the failure mechanisms are deliberated in this paper.

scholarly journals Evolution Mechanism of Interconnected Vertical Fractures in the Overburden of Longwall Coal Mining

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
He Changchun ◽  
Lu Weiyong ◽  
Zha Wenhua
Keyword(s):  
Compressive Strength ◽  
Theoretical Analysis ◽  
Field Test ◽  
Systematic Study ◽  
Water Inrush ◽  
Tensile Failure ◽  
Field Verification ◽  
Longwall Coal Mining ◽  
Similar Simulation ◽  
Vertical Fractures

Whether a tensile failure fracture will penetrate a stratum is difficult to ascertain at present. In view of this, the method of similar simulation and field verification are used to carry out a systematic study. Similar simulations show that tensile failure fractures will penetrate the layered strata if the compressive stress is greater than the compressive strength. Theoretical analysis points out that whether the tensile failure fractures will penetrate the layered strata can be expressed by the value of criterion of interconnected vertical fractures and the compression-tension ratio. When the value of criterion of interconnected vertical fractures is greater than the compression-tension ratio, the layered strata will break. This criterion was qualitatively verified with a field test. The results of this paper are of great significance for the prevention of water inrush in coal mines, and it can also promote the understanding of the law of strata movement.

Analysis on Numerical Simulation for Bionic Robot Fish Based on CATIA

2015 ◽  
Vol 742 ◽  
pp. 511-515
Author(s):  
De Jian Li
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Kinetic Energy ◽  
Theoretical Analysis ◽  
Flow Velocity ◽  
Experimental Research ◽  
Turbulence Kinetic Energy ◽  
Robot Fish ◽  
Preliminary Research

Based on the problem that there is a relatively small number of analog simulations on swimming of fish a in specific fluid conducted by science researchers, a simulated tuna model is established in this paper, in which CATIA is used to construct the streamline shape of simulated tuna and the method of computational fluid dynamics is utilized to simulate the swimming of tuna in marine environment. Indexes for fluid performance such as pressure on the surface of robot fish, turbulence kinetic energy and flow velocity of fluid around are focused on, and preliminary research on the variation trend of pressure on the robot fish and of turbulence kinetic energy at different velocities is conducted in this paper. Theoretical analysis and experimental research conducted in this paper may provide some references for design of shape of robot fish in the future.

scholarly journals Field test to confirm applicability of cement-stabilized pond-mud soil as fill material to repair or reinforce irrigation dam embankment.

2001 ◽  
pp. 269-284 ◽  
Author(s):  
Shinji FUKUSHIMA ◽  
Kazuo ISHIGURO ◽  
Akira KITAJIMA ◽  
Shigeru TANI ◽  
Yasuhiro IKEDA ◽  
...  
Keyword(s):  
Field Test ◽  
Fill Material

scholarly journals Analysis of Centroid Trajectory Characteristics of Axial-Flow Pump Impeller Under Hydraulic Excitation

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaohui Duan ◽  
Fangpin Tang ◽  
Hao Xu ◽  
Jian Chen ◽  
Qun Lu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Field Test ◽  
Water Pressure ◽  
Axial Flow ◽  
Pump Unit ◽  
Pump Impeller ◽  
Time Frequency ◽  
Axial Flow Pump ◽  
Flow Pump

The hydraulic excitation characteristics of axial flow pump unit are studied through theoretical analysis, numerical simulation and field test in this paper. The correlation between impeller hydraulic and radial vibration displacement of impeller centroid is obtained through theoretical analysis. Through the 1-way fluid-solid-interaction (FSI) numerical simulation, the distributions of water pressure and displacement on the impeller surface are obtained, and the time-domain and frequency-domain characteristics of transient hydraulic and radial displacement are revealed. Through the field test, the external characteristics of axial flow pump unit and the time-frequency characteristics of the pressure pulsation at the measuring points beside the inlet of the impeller are obtained. The comparisons between simulation results and experimental results show that the former is accurate and reliable.

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