Experimental Study on Aging Performance of Building Membrane Materials

2020 ◽  
Vol 852 ◽  
pp. 189-198
Author(s):  
Bin Wang ◽  
Jian Zheng ◽  
Fei Cai Wu ◽  
Shunsuk Otaka
Keyword(s):  
Experimental Study ◽  
Constitutive Equations ◽  
Performance Degradation ◽  
Current Status ◽  
Background Current ◽  
Membrane Materials ◽  
Membrane Performance ◽  
And Performance ◽  
Relaxation Characteristics ◽  
Aging Performance

The paper introduces the research background, current status and performance of architectural membrane materials, analyzes the superiority of PVC and PTFE performance, discusses the aging and standards of architectural membrane materials, and conducts new rheological destruction of architectural membrane materials. The aging and relaxation characteristics described by the constitutive equations, and the viscos-elastoplastic rheological failure of architectural membranes for constitutive experiments. At the end of the thesis, the aging performance degradation of architectural membrane materials is discussed, and the aging of architectural membrane materials and the significance of membrane performance degradation are explored in depth.

Exposure aboard high-performance Marine craft increases musculoskeletal pain and lowers contemporary work capacity of the occupants

2020 ◽  
pp. 147509022098146
Author(s):  
Manudul Pahansen de Alwis ◽  
Riccardo LoMartire ◽  
Björn O Äng ◽  
Karl Garme
Keyword(s):  
Neck Pain ◽  
Musculoskeletal Pain ◽  
High Performance ◽  
Occupational Exposures ◽  
Performance Degradation ◽  
Individual Risk ◽  
Work Related ◽  
Lower Back ◽  
And Performance ◽  
Exposure Conditions

High-Performance Marine Craft (HPMC) occupants are currently being investigated for various psychophysical impairments degrading work performance postulating that these deteriorations are related to their occupational exposures. However, scientific evidence for this is lacking and the association of exposure conditions aboard HPMC with adverse health and performance effects is unknown. Therefore, the study estimates the prevalence of musculoskeletal pain (MSP) among HPMC occupants and the association of their work exposure with MSP and performance degradation. It also presents a criterion for evaluating the self-reported exposure severity aboard three different types of mono-hull HPMC; displacement, semi-displacement and planing, on a par with the available standard criteria for objectively measurable exposures. Furthermore, another criterion is proposed to assess the performance-degradation of HPMC occupants based on self-reported fatigue symptoms and MSP. Swedish Coast Guard HPMC occupants were surveyed for MSP, fatigue symptoms as well as for work-related and individual risk indicators using a validated web-based questionnaire. Prevalence of MSP and performance-degradation during the past 12 months were assessed and presented as a percentage of the sample. Associations of exposure conditions aboard HPMC with MSP and performance-capacity were systematically evaluated using multiple logistic regression models and expressed as odds ratio (OR). Prevalence of MSP was 72% among which lower back pain was the most prevalent (46%) followed by neck pain (29%) and shoulder pain (23%) while 29% with degraded performance. Exposure to severe conditions aboard semi-displacement craft was associated with lower back (OR = 2.3) and shoulder (OR = 2.6) pain while severe conditions aboard planing craft with neck pain (OR = 2.3) and performance-degradation (OR = 2.6). MSP is common among Swedish coast guards. Severe exposure conditions aboard HPMC are significantly associated with both MSP and performance-degradation. The spine and shoulders are the most susceptible to work-related MSP among HPMC occupants which should be targeted in work-related preventive and corrective measures.

scholarly journals Nurses’ hemovigilance knowledge and performance after teach-back, concept map, and lecture: A quasi-experimental study

Heliyon ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. e05982
Author(s):  
Daryadokht Masror Roudsari ◽  
Shahoo Feizi ◽  
Mahtab Maghsudlu
Keyword(s):  
Experimental Study ◽  
Concept Map ◽  
Quasi Experimental ◽  
And Performance

Current Status, Design and Performance Trends for the Regenerative Flow Compressors and Pumps

2002 ◽  
Author(s):  
Mukarrum Raheel ◽  
Abraham Engeda
Keyword(s):  
Performance Improvement ◽  
Current Status ◽  
Ongoing Research ◽  
Performance Trends ◽  
The Family ◽  
Working Principle ◽  
Low Specific Speed ◽  
And Performance ◽  
Number Of Publications ◽  
Regenerative Flow

Regenerative flow compressors and pumps, hereafter called RFC/RFP have found many applications in industry; still they are the most neglected turbomachines in the family of dynamic compressors. The number of publications existing in literature is very small compared to the large number of papers about the centrifugal and axial turbocompressors. This paper gives a detail discussion of fundamentals and working principle of regenerative turbomachines. Regenerative compressors are compared with centrifugal compressors and the importance of regenerative turbomachines in low specific speed range is emphasized. The major findings of available literature on regenerative turbomachine are summarized. The current status, limitations and some of the challenges faced by RFC/RFP are assessed in context of performance improvement. The paper concludes with an overview of ongoing research and future directions to be followed for performance improvement of this neglected class of turbomachines.

Direct growth of graphene on rigid and flexible substrates: progress, applications, and challenges

2017 ◽  
Vol 46 (20) ◽  
pp. 6276-6300 ◽  
Author(s):  
Viet Phuong Pham ◽  
Hyeon-Sik Jang ◽  
Dongmok Whang ◽  
Jae-Young Choi
Keyword(s):  
Performance Degradation ◽  
Flexible Substrates ◽  
Graphene Growth ◽  
Transfer Processes ◽  
Direct Growth ◽  
And Performance ◽  
Insulating Substrates

A review of various strategies, including transfer-free direct graphene growth on insulating substrates, which avoids the transfer processes that cause graphene defects, residues, tears and performance degradation in graphene-based functional devices. Applications and challenges of "direct growth of graphene'' in commercialization are discussed and addressed.

The Use of High Energies Radiations to Characterise Solid-Liquid Systems

2005 ◽  
Vol 498-499 ◽  
pp. 49-54 ◽  
Author(s):  
Fábio de Oliveira Arouca ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Gamma Rays ◽  
Constitutive Equations ◽  
Liquid System ◽  
Local Concentration ◽  
High Energies ◽  
Transient Regimes ◽  
Medium Permeability ◽  
Liquid Systems ◽  
And Performance ◽  
Solid Liquid

The behavior of an isothermal and non-reaction solid-liquid system can be model using a mathematical model based on the Mixtures’ Theory of Continuum Mechanics. The knowledge of the constitutive equations of this phenomenon, as pressure on the solids and medium permeability, is very important in the design and performance evaluation of the continuous thickeners or filters. In this work the batch sedimentation phenomena of a kaolin aqueous suspensions was investigated. The technique consists on measuring of the gamma rays attenuation when they cross the physical media as a function of the local concentration at several vertical positions in a reservoir. Using the experimental data and local concentration as a function of the attenuation curve, it is possible to determine the constitutive equations. The results were satisfactory, allowing simulations of this phenomenon for steady and transient regimes in future papers.

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