The impact of ultraviolet light exposure on the performance of polybenzidimazole and polyaramid fabrics: Prediction of end-of-life performance

2017 ◽  
Vol 48 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Shadi Houshyar ◽  
Rajiv Padhye ◽  
Sandip Ranjan ◽  
Steve Tew ◽  
Rajkishore Nayak
Keyword(s):  
End Of Life ◽  
Residual Strength ◽  
Ultraviolet Irradiation ◽  
Protective Clothing ◽  
Performance Test ◽  
Light Exposure ◽  
Test Results ◽  
And Performance ◽  
The Impact ◽  
Frequent Exposure

This study evaluated the deterioration in thermo-mechanical and performance properties of the polyaramid and polybenzidimazole fabric used in firefighters’ protective clothing after exposure to ultraviolet irradiation, and the effect of weathering. The performance of firefighters’ protective clothing plays an important role in protection against heat and physical threats to firefighters. However, frequent exposure to heat and ultraviolet irradiation can deteriorate performance. Test results demonstrated a 79% drop in the residual strength of polybenzidimazole/Kevlar® fabric and a 51% drop in the residual strength of polyaramid (Nomex® IIIA). The results confirmed that heat accelerates the degradation of PBI, resulting in lower performance, an important consideration for firefighters’ protective clothing. In this study, a new ‘UVPro-Tex’ sensor was developed, with the capability to record the amount of ultraviolet irradiation absorbed by the fabric. When the amount of the absorbed ultraviolet irradiation reaches a critical value, the sensor warns the wearer of the end-of-life of the garment.

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

2021 ◽  
pp. 1-8
Author(s):  
Junta Iguchi ◽  
Minoru Matsunami ◽  
Tatsuya Hojo ◽  
Yoshihiko Fujisawa ◽  
Kenji Kuzuhara ◽  
...  
Keyword(s):  
Performance Test ◽  
Vertical Jump ◽  
American Football ◽  
Football Players ◽  
Jump Height ◽  
Test Results ◽  
Repetition Maximum ◽  
Vertical Jump Height ◽  
Division 1 ◽  
And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

scholarly journals Research on Real Working Condition Simulation and Performance Test of Wind Power Main Bearing Based on Test Bench

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guodong Zhai ◽  
Xujie Qin ◽  
Xing Yang
Keyword(s):  
Wind Power ◽  
Performance Test ◽  
Test Bench ◽  
Test Results ◽  
Main Bearing ◽  
Loading System ◽  
Modeling Software ◽  
And Performance ◽  
Drive And Control ◽  
And Control

As a renewable energy source, wind energy has received more and more attention, and the wind power industry has also been advocated and developed by countries all over the world. In the production and use of wind turbines, the design and manufacturing technology of wind turbine bearings is very important. In order to ensure the reliable operation of the wind power main bearing after installation and realize the longest life of it, this paper designs a bearing test bench that can test the performance of the wind power main bearing. It can analyze the temperature, displacement, load, and moment of the key parts of the 5 MW wind power main shaft bearing. The solid modeling of the experimental platform was carried out using the 3D modeling software SolidWorks. Hydraulic loading system and test monitoring system are designed to realize the drive and control of the test bench. Through the established mathematical model, the central load of the hub is converted into the axial cylinder load and the radial cylinder load of the test bench to simulate the actual working conditions of the tested bearing. The test results show that the test bench meets various loading requirements and can reliably complete the task of testing wind power main bearings.

scholarly journals Development and Performance Test Results of 50kA Vapor-cooled Current Lead for ITER.

1998 ◽  
Vol 33 (8) ◽  
pp. 549-560 ◽  
Author(s):  
Makoto SUGIMOTO ◽  
Takaaki ISONO ◽  
Kazuya HAMADA ◽  
Katsumi KAWANO ◽  
Norikiyo KOIZUMI ◽  
...  
Keyword(s):  
Performance Test ◽  
Current Lead ◽  
Test Results ◽  
And Performance

UPGRADES OF PROJECTING CHARGE FOR APFSDS-T-TP AMMUNITION FIRED WITH 120 MM GUN OF LEOPARD 2 TANK

2018 ◽  
Vol 146 (2) ◽  
pp. 107-117
Author(s):  
Tadeusz Kuśnierz
Keyword(s):  
Performance Test ◽  
Armed Forces ◽  
Development Work ◽  
Home Production ◽  
Research Development ◽  
Test Results ◽  
Random Vibrations ◽  
Certification Tests ◽  
And Performance ◽  
Charge Design

APFSDS-T-TP ammunition of home production for 120 mm gun of LEOPARD 2 tank, being on the inventory of the Polish Armed Forces, has not passed the requirements of NO-13-A513 Defence Standard at certification tests against the random vibrations occurring at its tactical transportation inside the tank. Performed tests have indicated that the fulfilment of Standard requirements can be achieved by upgrading the igniting system what also makes the projecting charge design of APFSDS-T-TP ammunition change. The paper describes the research-development work on the upgrading of the igniting system for the cartridges used in 120 mm gun of LEOPARD 2 tank. The designs of the existing and upgraded igniting systems are presented both with the designing changes of projecting charges and ammunition ballistic and performance test results.

scholarly journals Characteristics of Specialised Firefighter Clothing Used in Poland – the Thermal Parameters

2020 ◽  
Vol 28 (1(139)) ◽  
pp. 65-70
Author(s):  
Magdalena Młynarczyk
Keyword(s):  
Thermal Insulation ◽  
Protective Clothing ◽  
Thermal Parameters ◽  
Thermal Manikin ◽  
Test Results ◽  
Evaporative Resistance ◽  
Different Types ◽  
Local Thermal Insulation ◽  
Materials Used ◽  
The Impact

This paper describes the characteristic thermal parameters of firefighters’ personal protective clothing (FFPPC) used in Poland. The total thermal insulation and evaporative resistance of three different types of FFPPC were measured and used on a thermal manikin. Next, the results were compared. Based on the analyses and calculations of the test results, it was shown that FFPPC provides a barrier to the heat exchange between the user and the surrounding environment. Differences in the local thermal insulation can be triggered not only by the material used but they can also be attributable to clothes fitted on the manikin. The biggest differences can be noted on the segments forming part of the manikin’s trunk. No difference was found in the evaporative resistance between the clothes tested. In order to examine further the impact of the materials used on thermal parameters of protective clothing, it is necessary to carry out an analysis of the impact of individual layers.

scholarly journals How Can IoT Applicable to Practice Gross Motor Skill Through Hopscotch Game?

2020 ◽  
Vol 4 (3) ◽  
pp. 584-590
Author(s):  
Irvan Naufali Rahmanto ◽  
Novian Anggis Suwastika ◽  
Rahmat Yasirandi
Keyword(s):  
Motor Development ◽  
Performance Test ◽  
Physical Growth ◽  
Fine Motor ◽  
Test Results ◽  
Gross Motor ◽  
Muscle Strengthening ◽  
Assessment Activity ◽  
And Performance ◽  
Foot Position

Motor development is the result of changes caused by physical growth, muscle strengthening, and the ability to interact with the environment. There are two types of motor development, namely gross motor and fine motor. The best age for a child for motor development is 0 to 8 years. At the age of 4 to 6 years mostly of children's gross motor activities related to balance and coordination. Child’s development of gross motor can be achieved by stimulating using games. Hopscotch is type of game that implements balance and coordination skills that support the development of gross motor skills. In Indonesia, children aged 4 years to 6 years have started to enter the Early Childhood Education and Kindergarten level. When the child is at school, parents cannot provide motor stimulation and must wait for the child's motor development reports submitted by the teachers. In this study we implemented system to stimulate the development of gross motor balance and coordination in children aged 4 to 6 years using hopscotch game integrated with Internet of Things (IoT) technology. IoT provides the ability to read, record, and evaluate children's activities and publish their results online for parents to access. This system is evaluated based on the system's functionality and performance parameters. From the test results found that the functionality of the system runs 100% by the specified function. The system performance test results from the sensor readings are under 1 second and the accuracy of the assessment activity of the first test variation of the foot position in the middle of 68.75%, and the foot position at the edge of 81.25% with the program delay setting from the node to the IoT platform an average of 1 second.

Performance and Simulated Performance Test Results as a Function of Instruction by Still and Motion Visuals

1981 ◽  
Vol 10 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Unna H. Jeon ◽  
Robert K. Branson
Keyword(s):  
Motor Skills ◽  
Performance Test ◽  
Visual Media ◽  
Performance Tests ◽  
Test Results ◽  
Simulated Performance ◽  
Instructional Objectives ◽  
And Performance ◽  
Written Test ◽  
Better Than

This study evaluates the effectiveness of three different media in teaching a specific motor skill. Validated lessons utilizing three different media — motion/sound, slide/sound, and story boards — were used to teach basic manipulations of the M203 Grenade Launcher. Written and performance tests, derived directly from the instructional objectives, were used to evaluate the learning. As evaluated by the performance test, learners using motion film performed significantly better than those using either slides or workbooks, and required significantly less time. Written tests, however, failed to detect this difference. These results suggest that much previous research comparing media may have been inconclusive due to defects in experimental design, such as using a written test to measure motor skills taught by visual media.

On the Development and Performance Test of Combined Packing Integrated Device for Treating Domestic Sewage Aboard Ships

2011 ◽  
Vol 66-68 ◽  
pp. 2153-2157
Author(s):  
Zhi Li Chen ◽  
Kai Sheng Xiong ◽  
Wan Tu Zhang ◽  
Wen Biao Wang ◽  
Wen Ping Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Performance Test ◽  
Simulation Experiment ◽  
Sewage Treatment ◽  
High Specific Surface Area ◽  
Domestic Sewage ◽  
Raw Water ◽  
And Performance ◽  
Integrated Device ◽  
The Impact

This paper elaborates on the development of elastic combined packing and an integrated device for treating domestic sewage aboard ships, analyzes the growth of combined packing microorganisms, the speed of membrane forming as well as the impact of raw water quality on membrane forming, and conducts a simulation experiment of treating domestic sewage by membrane bio-reactors. Researches show that elastic combined packing features high specific surface area and high speed of membrane forming and that this integrated domestic sewage treatment device performs well and can be widely applied.

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