scholarly journals Post Fire Residual Strength of the Wall-Slab Using Siliceous Concrete

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1793
Author(s):  
Su-Hyeon Lee ◽  
Byong-Jeong Choi
Keyword(s):  
Residual Strength ◽  
Fire Test ◽  
Performance Test ◽  
Deflection Angle ◽  
Simple Calculation ◽  
Residual Performance ◽  
The One ◽  
Heating Test ◽  
Real Scale ◽  
Test Result

It is very important to understand the residual performance of a structure for repair, retrofit, and reuse of a building after a fire. In this study, an experiment is conducted on the residual performance of real-scale siliceous aggregates-based reinforced concrete (RC) wall-slab connection (WSC) after the fire, using the simple calculation method (SCM) of standards (Eurocode, ACI, and NIST) for comparison and analysis. A description of the WSC specimen and detailed methods for the experiment are introduced. The fire test is conducted according to the fire scenario by dividing it into one-sided and two-sided heating based on the wall. In the post-fire residual performance test, the load–displacement and moment-deflection angle relationship according to the fire time are derived and discussed. In addition, the residual mechanical properties after the fire are derived for the 35 MPa siliceous concrete used in the wall-slab specimen. The load and moment, derived using SCM, are compared with the experimental results. Our results show that the one-sided heating test result is close to that of Eurocode’s SCM, and the two-sided heating test result is close to that of ACI (NIST)’s SCM. This study provides a database on the residual strength through a real-scale fire test and standard comparison.

scholarly journals Real Scale Fire Test for the Karaoke Fire Risk Analysis

2012 ◽  
Vol 12 (6) ◽  
pp. 1-6 ◽  
Author(s):  
Yong Ho Yoo ◽  
Young Hwa Choi ◽  
Oh Sang Kweon
Keyword(s):  
Risk Analysis ◽  
Fire Test ◽  
Fire Risk ◽  
Fire Risk Analysis ◽  
Real Scale

scholarly journals Performance Variance  Evaluation on  Mozilla Firefox

2021 ◽  
Author(s):  
◽  
Jan Larres
Keyword(s):  
Statistical Technique ◽  
External Factors ◽  
Software Performance ◽  
Performance Tests ◽  
Test Results ◽  
Actual Performance ◽  
Reliable Detection ◽  
Mozilla Firefox ◽  
The One ◽  
Test Result

<p>In order to evaluate software performance and find regressions, many developers use automated performance tests. However, the test results often contain a certain amount of noise that is not caused by actual performance changes in the programs. They are instead caused by external factors like operating system decisions or unexpected non-determinisms inside the programs. This makes interpreting the test results hard since results that differ from previous results cannot easily be attributed to either genuine changes or noise. In this thesis we use Mozilla Firefox as an example to try to find the causes for this performance variance, develop ways to reduce the noise and present a statistical technique that makes identifying genuine performance changes more reliable. Our results show that a significant amount of noise is caused by memory randomization and other external factors, that there is variance in Firefox internals that does not seem to be correlated with test result variance, and that our suggested statistical forecasting technique can give more reliable detection of genuine performance changes than the one currently in use by Mozilla.</p>

Development of Solar-Powered Microcontroller-Relay-Based Control System Omnidirectional Wheelchair

2021 ◽  
pp. 181-191
Author(s):  
Patrick Uche Okafor ◽  
Ndidi Stella Arinze ◽  
Osondu Ignatius Onah ◽  
Ebenezer Nnajiofo Ogbodo
Keyword(s):  
Power Supply ◽  
System Performance ◽  
Performance Test ◽  
Reference Signal ◽  
Control Mechanisms ◽  
Solar Module ◽  
Dc Motors ◽  
Solar Powered ◽  
Physically Challenged ◽  
Test Result

A solar-powered omnidirectional wheelchair is implemented for physically challenged persons. The framework was mounted on the wheels that were connected with two direct current (DC) motors. The ratings of the battery and solar module were determined using system voltage (12V). A 7,805-voltage regulator was used to supply 5VDC to the AT89352 microcontroller. The microcontroller was programmed to provide a reference signal to the motor. The motor provides the needed torque to drive the wheels through interconnected relays. The relays are energized by the microcontroller and omnidirectional movement achieved through relays connected with microprocessor and micro switches, eliminating the need for joysticks and complex control mechanisms. System performance test result showed that the auxiliary solar power supply of the wheelchair increased the travel range by approximately 86% compared with that of a wheelchair powered by battery alone.

Technical and Economic Analysis of 150MW Turbine Unit about Two Reconstruction Modes for High Back Pressure Heating

2013 ◽  
Vol 291-294 ◽  
pp. 1708-1713 ◽  
Author(s):  
Jun Zhai Duan ◽  
Wei Zheng ◽  
Xue Dong Wang ◽  
Yu Zhen Hao
Keyword(s):  
Performance Test ◽  
Heat Rate ◽  
Low Pressure ◽  
Back Pressure ◽  
Heating Condition ◽  
Pressure Condition ◽  
Lower Back ◽  
Cold Source ◽  
Technical And Economic Analysis ◽  
The One

In this paper, the characteristics of two modes of high back pressure reconstruction techniques for 150 MW reheat turbine units were researched. One was reconstruction of double back pressure and double rotors and the other was one-off reconstruction of LP cylinder. The former redesigned for lower pressure(LP) rotors for running at high back pressure, and hydraulic coupling bolts adopted to achieve the switch of low pressure rotors that run at high and lower back pressures. The one-off reconstruction of LP cylinder has achieved the switch of static and dynamic blades between high and low pressure. The two reconstruction both realized heat supply on the high back pressure condition, utilized cold source loss and increased the unit efficiency. After reconstruction, the economic index under both normal back pressure condition and high back pressure heating condition have been obtained by performance test. Under the high back pressure heating condition, the unit heat rate reaches 3700-3800kJ/kW.h, and the thermal efficiency has achieved 95-97%.

scholarly journals Development of width control system in hot strip mill. Performance test result on actual AWC edger.

1990 ◽  
Vol 56 (526) ◽  
pp. 1620-1625
Author(s):  
Hiroyuki HINO ◽  
Ryuichi OZONO ◽  
Hidehiko TSUKAMOTO ◽  
Kazuhiro TSUKUDA
Keyword(s):  
Control System ◽  
Performance Test ◽  
Hot Strip Mill ◽  
Hot Strip ◽  
Test Result

A Real Scale Fire Test for the Fire Risk Assessment of Mattress

2013 ◽  
Vol 13 (6) ◽  
pp. 39-44
Author(s):  
Yong Ho Yoo ◽  
Kye Won Park ◽  
Sun Myoung Kim
Keyword(s):  
Risk Assessment ◽  
Fire Test ◽  
Fire Risk ◽  
Fire Risk Assessment ◽  
Real Scale

Femtosecond laser-processed staining microchip for one-step preparation of fluorescent DNA sample without loss of DNAs

2019 ◽  
Author(s):  
Yeongseok Jang ◽  
Hojun Shin ◽  
Jinmu Jung ◽  
Jonghyun Oh
Keyword(s):  
Femtosecond Laser ◽  
Performance Test ◽  
Staining Method ◽  
Laser System ◽  
Molecular Transport ◽  
Main Channel ◽  
Step Procedure ◽  
One Step ◽  
On Chip ◽  
The One

In this study, we propose a microchip that is sequentially capable of fluorescently staining and washing DNAs. The main advantage of this microchip is that it allows for one-step preparation of small amounts of solution without degrading microscopic bio-objects such as the DNAs, cells, and biomolecules to be stained. The microchip consists of two inlets, the main channel, staining zone, washing zone, and one outlet, and was processed using a femtosecond laser system. High molecular transport of rhodamine B to deionized water was observed in the performance test of the microchip. Results revealed that the one-step procedure of on-chip DNA staining and washing was excellent compared to the conventional staining method. The one-step preparation of stained and washed DNAs through the microchip will be useful for preparing small volumes of experimental samples.

Rail Tank Car Total Containment Fire Testing: Results and Observations

2016 ◽  
Author(s):  
Francisco Gonzalez ◽  
Anand Prabhakaran ◽  
Andrew Robitaille ◽  
A. M. Birk ◽  
Frank Otremba
Keyword(s):  
Test Performance ◽  
Fire Test ◽  
Thermal Protection ◽  
Research Effort ◽  
Full Scale ◽  
Fire Tests ◽  
Naoh Solution ◽  
Failure Conditions ◽  
The One ◽  
Fill Level

The frequent incidences of Non-Accident Releases (NARs) of lading from tank cars have resulted in an increasing interest in transporting hazardous materials in total containment conditions (i.e., no pressure relief devices). However, the ability of tank cars to meet thermal protection requirements provided in the Code of Federal Regulations under conditions of total containment has not been established. The intent of this effort was to evaluate through a series of third-scale fire tests, the ability of tank cars to meet the thermal protection requirements under total containment conditions, with a particular focus on caustic ladings. A previous paper on this effort described the test design and planning effort associated with this research effort. A series of seven fire tests were conducted using third scale tanks. The test fires simulated fully engulfing, hydrocarbon fueled, pool fire conditions. The initial tests were conducted with water as a lading under jacketed and non-jacketed conditions and also with different fill levels (98% full or 50% full). Additionally, two tests were conducted with the caustic, Sodium Hydroxide as the lading, each test with a different fill level. In general, the tanks with water were allowed to fail or reach near-failure conditions, whereas, the tests with the caustic lading were not allowed to proceed near failure for safety reasons. This paper describes the results and observations from the fire tests, and discusses the various factors that affected the fire test performance of the test tanks. Review of results from the one-third scale tests, and subsequent scaling to full-scale suggest that a full-scale tank car filled with 50% NaOH solution is unlikely to meet the 100-minute survival requirement under conditions of total containment.

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