Sensitivity of performance and degradation measurements on AMTEC electrodes in sodium exposure test cells to experiment conditions

The influence of moisture content on substrate thermal conductivity at different temperatures was investigated for four different commercially available substrates for green roofs. In the unfrozen state, as moisture content increased, thermal conductivity increased linearly. In the phase transition zone between +5 and −10 °C, as temperature decreased, thermal conductivity increased sharply during the transition from water to ice. When the substrate was frozen, thermal conductivity varied exponentially with substrate moisture content prior to freezing. Power functions were found between thermal conductivity and temperature. Two equally sized, green roof test cells were constructed and tested to compare various roof configurations including a bare roof, varying media thickness for a green roof, and vegetation. The results show that compared with the bare roof, there is a 75% reduction in the interior temperature’s amplitude for the green roof with 150 mm thick substrate. When a sedum mat was added, there was a 20% reduction in the amplitude of the inner temperature as compared with the cell without a sedum mat.

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A team-based competition for undergraduate medical students to learn radiology within the virtual world Second Life

Insights into Imaging ◽

10.1186/s13244-021-01032-3 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Teodoro Rudolphi-Solero ◽

Alberto Jimenez-Zayas ◽

Rocio Lorenzo-Alvarez ◽

Dolores Domínguez-Pinos ◽

Miguel Jose Ruiz-Gomez ◽

...

Keyword(s):

Medical Students ◽

Second Life ◽

Virtual World ◽

Student Perception ◽

Load Test ◽

Undergraduate Medical Students ◽

Exposure Test ◽

Radiological Anatomy ◽

Post Exposure ◽

Course Grades

Abstract Background A multi-user competitive game within the virtual world Second Life for undergraduate radiology learning was adapted for team participation. This study aimed to assess student perception, impact on learning, and eventual correlation of game results with post-exposure tests and course grades. Methods The game consisted of six weekly stages, dedicated to thoracic, abdominal, and musculoskeletal radiological anatomy and semiology. Participants had several days a week to review self-guided radiology educational content and then complete individual multiple-choice tests and solve team tasks to progress through the game's ranking. Additionally, they completed a cognitive load test, a questionnaire about the experience and a post-exposure knowledge test. Results Fifty-two students organised into 13 teams participated in the game and assessed different aspects of the experience with a mean score ≥ 7.8 on a 10-point scale, highlighting the participation of the teacher (9.3 ± 1.1), the educational contents (8.8 ± 1.4) and the usefulness for their education (8.7 ± 1.4). Participants obtained better post-exposure test results (p < 0.007) and better course grades (p < 0.021) than non-participants did. Conclusion A multi-user game adapted to team competition to learn radiology in Second Life was very positively perceived by third-year medical students, who highly valued its content, organisation, and usefulness for their training. Most of the participants agreed that they had collaborated as a team and that playing in competitive environments helps them learn better. The best post-exposure and academic results compared to non-participating students indicate the potential impact of the game on learning.

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Corrosion Testing of Armour Wire in Simulated Annulus Environments of Flexible Pipelines: An Update

Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops ◽

10.1115/omae2003-37473 ◽

2003 ◽

Cited By ~ 1

Author(s):

Richard Clements ◽

Andrew D. Ethridge

Keyword(s):

Deionized Water ◽

Small Scale ◽

General Corrosion ◽

Flexible Pipe ◽

Scale Test ◽

Condensed Water ◽

Test Cells ◽

Sour Service ◽

First Time ◽

Permeation Models

This paper describes further investigations, utilising small scale test cells, into the general corrosion which can occur on wires within the inherent annulus space in a flexible pipe, particularly, and for the first time, in a sour service (H2S containing) environment. The work enhances data presented previously in 2002. Tests have been performed in cells specifically designed to simulate, as closely as possible, the environment and confines of a flexible pipe annulus, using solutions of both deionized water and seawater (to represent seawater flooding and condensed water). The systems were saturated with CO2 and H2S to simulate permeation of gases through the polymer pressure sheath (as predicted by validated permeation models). Weight loss measurements were undertaken in order to quantify the corrosion rate in these simulated annulus environments and metallography was undertaken to characterise the corrosion and check for HIC/SOHIC.

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EFFECT OF YELLOW LOESS ON ODOROUS GAS ADSORPTION AND ECOTOXICITY TEST USING DAPHNIA MAGNA

Journal of Green Building ◽

10.3992/jgb.16.1.103 ◽

2021 ◽

Vol 16 (1) ◽

pp. 103-114

Author(s):

Hongseok Jang ◽

Boram Lee ◽

Seungyoung So

Keyword(s):

Daphnia Magna ◽

Cement Mortar ◽

Construction Material ◽

Objective Assessment ◽

Test Chamber ◽

Construction Materials ◽

Ecotoxicity Test ◽

Lamellar Crystal ◽

Exposure Test ◽

Natural Materials

ABSTRACT To minimize damage caused by harmful substances released from artificial construction materials, there has been increasing interest in eco-friendly houses constructed with natural materials. Among natural materials, yellow loess is South Korea’s most representative eco-friendly construction material, with high purification performance for indoor use. However, there has been no objective assessment of yellow loess’s performance at purifying indoor air. In this study, internal pores were found in yellow loess that were of a lamellar crystal structure consisting of bonds of silica and alumina plates, and there was a high negative charge on the loess surface; these might have contributed to the excellent performance of yellow loess in adsorbing odorous gas. There was also an exposure test using Daphnia magna to determine the eco-friendliness of yellow loess compared with that of cement mortar. Results showed the survival of Daphnia magna was longer in the indoor environment of a test chamber with higher concentration of ammonia wherein yellow loess was placed. EC50 (median effective concentration, the concentration that caused death of 50% of bio-specimens) value of 19 ml of ammonia (0.1% solution), which was three times more than EC50 value of 6 ml of ammonia of the same area of cement mortar.

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In vivo antithrombotic properties of a heparin from the oocyte test cells of the sea squirt Styela plicata(Chordata-Tunicata)

Brazilian Journal of Medical and Biological Research ◽

10.1590/s0100-879x2006001100004 ◽

2006 ◽

Vol 39 (11) ◽

pp. 1409-1415 ◽

Cited By ~ 10

Author(s):

L. Cardilo-Reis ◽

M.C.M. Cavalcante ◽

C.B.M. Silveira ◽

M.S.G. Pavão

Keyword(s):

Styela Plicata ◽

Sea Squirt ◽

Test Cells

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Antimicrobial effect of 2% sodium hypochlorite and 2% chlorhexidine tested by different methods

Brazilian Dental Journal ◽

10.1590/s0103-64402003000100011 ◽

2003 ◽

Vol 14 (1) ◽

pp. 58-62 ◽

Cited By ~ 57

Author(s):

Carlos Estrela ◽

Rosane Galhardo Ribeiro ◽

Cyntia R.A. Estrela ◽

Jesus Djalma Pécora ◽

Manoel Damião Sousa-Neto

Keyword(s):

Sodium Hypochlorite ◽

Culture Medium ◽

Agar Plate ◽

Antimicrobial Effect ◽

Control Group ◽

Diffusion Test ◽

Exposure Test ◽

Agar Diffusion ◽

Direct Exposure ◽

Agar Diffusion Test

The objective of this study was to analyze the antimicrobial effect of 2% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX) by agar diffusion test and by direct exposure test. Five microorganisms: Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa, Bacillus subtilis, Candida albicans, and one mixture of these were used. These strains were inoculated in brain heart infusion (BHI) and incubated at 37ºC for 24 h. For the agar diffusion test (ADT), 18 Petri plates with 20 ml of BHI agar were inoculated with 0.1 ml of the microbial suspensions, using sterile swabs that were spread on the medium, obtaining growth in junction. Fifty-four paper disks (9 mm in diameter) were immersed in the experimental solutions for 1 min. Subsequently, three papers disks containing one of the substances were placed on the BHI agar surface in each agar plate. The plates were maintained for 1 h at room temperature, and then incubated at 37ºC for 48 h. The diameter of microbial inhibition was measured around the papers disks containing the substances. For the direct exposure test, 162 #50 sterile absorbent paper points were immersed in the experimental suspensions for 5 min, and were then placed on Petri plates and covered with one of the irrigant solutions, or with sterile distilled water (control group). After intervals of 5, 10 and 30 min, the paper points were removed from contact with the solutions and individually immersed in 7 ml of Letheen Broth, followed by incubation at 37ºC for 48 h. Microbial growth was evaluated by turbidity of the culture medium. A 0.1 ml inoculum obtained from the Letheen Broth was transferred to 7 ml of BHI, and incubated at 37ºC for 48 h. Bacterial growth was again evaluated by turbidity of the culture medium. Gram stain of BHI cultures was used for verification of contamination and growth was determined by macroscopic and microscopic examination. The best performance of antimicrobial effectiveness of NaOCl was observed in the direct exposure test, and of CHX was observed in the agar diffusion test. The magnitude of antimicrobial effect was influenced by the experimental methods, biological indicators and exposure time.

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