scholarly journals Equations for the maintenance of standard testing conditions when using the hot flammability test apparatus (HFTA)

1980 ◽  
Vol 4 (1) ◽  
pp. 59-60 ◽  
Author(s):  
R. K. Wharton
Keyword(s):  
Test Apparatus ◽  
Testing Conditions ◽  
Standard Testing ◽  
Flammability Test

scholarly journals Does sleep-dependent consolidation favour weak memories?

2020 ◽  
Author(s):  
Marit Petzka ◽  
Ian Charest ◽  
George M. Balanos ◽  
Bernhard Staresina
Keyword(s):  
Memory Consolidation ◽  
Retroactive Interference ◽  
Delay Period ◽  
Interference Task ◽  
Testing Conditions ◽  
Standard Testing ◽  
Different Types ◽  
Ceiling Effects ◽  
Consolidation Effect

Sleep stabilizes newly acquired memories, a process referred to as memory consolidation. According to recent studies, sleep-dependent consolidation processes might be deployed to different extents for different types of memories. In particular, weaker memories might benefit greater from post-learning sleep than stronger memories. However, under standard testing conditions, sleep-dependent consolidation effects for stronger memories might be obscured by ceiling effects. To test this possibility, we devised a new memory paradigm (Memory Arena) in which participants learned temporospatial arrangements of objects. Prior to a delay period spent either awake or asleep, training thresholds were controlled to yield relatively weak or relatively strong memories. After the delay period, retrieval difficulty was controlled via the presence or absence of a retroactive interference task. Under standard testing conditions (no interference), a sleep-dependent consolidation effect was indeed observed for weaker memories only. Critically though, with increased retrieval demands, sleep-dependent consolidation effects were seen for both weaker and stronger memories. These results suggest that all memories are consolidated during sleep, but that memories of different strengths warrant different testing conditions to unveil their benefit from post-learning sleep.

Contacting Interdigitated Back-Contact Solar Cells With Four Busbars for Precise Current–Voltage Measurements Under Standard Testing Conditions

2012 ◽  
Vol 2 (3) ◽  
pp. 247-255 ◽  
Author(s):  
Carsten Schinke ◽  
Fabian Kiefer ◽  
Matthias Offer ◽  
David Hinken ◽  
Arne Schmidt ◽  
...  
Keyword(s):  
Solar Cells ◽  
Back Contact ◽  
Testing Conditions ◽  
Standard Testing ◽  
Current Voltage

scholarly journals Optimal Susceptibility Testing Conditions for Detection of Azole Resistance in Aspergillus spp.: NCCLS Collaborative Evaluation

2001 ◽  
Vol 45 (6) ◽  
pp. 1828-1835 ◽  
Author(s):  
A. Espinel-Ingroff ◽  
M. Bartlett ◽  
V. Chaturvedi ◽  
M. Ghannoum ◽  
K. C. Hazen ◽  
...  
Keyword(s):  
Susceptibility Testing ◽  
Antifungal Susceptibility ◽  
Antifungal Susceptibility Testing ◽  
Testing Conditions ◽  
Standard Testing ◽  
Animal Data ◽  
Resistant Strains ◽  
Collaborative Evaluation

ABSTRACT The most important role of susceptibility testing is to identify potentially resistant isolates for the agent being evaluated. Standard testing guidelines recently have been proposed for antifungal susceptibility testing of filamentous fungi (molds). This collaborative (eight centers) study evaluated further newly proposed guidelines (NCCLS, proposed standard M38-P, 1998) and other testing conditions for antifungal susceptibility testing of Aspergillus spp. to itraconazole and three new triazoles, posaconazole (SCH56592), ravuconazole (BMS-207147), and voriconazole. MICs of itraconazole, posaconazole, ravuconazole, and voriconazole for 15 selected isolates of three species of Aspergillus (A. fumigatus, A. flavus, and A. terreus) with well documented in vitro, clinical, or animal data were determined in each center by using four medium formulations (standard RPMI-1640 [RPMI], RPMI with 2% dextrose, antibiotic medium 3 [M3], and M3 with 2% dextrose) and two criteria of MIC determination (complete [MIC-0s] and prominent [MIC-2s] growth inhibition) at 24, 48, and 72 h. The highest reproducibility (92 to 99%) was seen with the standard RPMI and M3 media. Moreover, the distinction between itraconazole-resistant (MICs of >8 μg/ml for clinically resistant strains) and -susceptible (MICs of 0.03 to 1 μg/ml) isolates, as well as between a voriconazole-resistant laboratory mutant and other isolates (voriconazole MICs of 2 to >8 versus 0.12 to 2 μg/ml), was more consistently evident with the standard RPMI medium and when MIC-0s were determined at 48 h. These results provide further refinement of the testing guidelines for susceptibility testing ofAspergillus spp. and warrant consideration for inclusion in the future NCCLS document M38-A.

Determination of Graft Forces for Cranial Cruciate Ligament Reconstruction in the Dog

1996 ◽  
Vol 09 (04) ◽  
pp. 165-171 ◽  
Author(s):  
D. A. Hulse ◽  
M. R. Slater ◽  
J. F. Hunter ◽  
W. A. Hyman ◽  
B. A. Shelley
Keyword(s):  
Degrees Of Freedom ◽  
Cruciate Ligament ◽  
Insertion Site ◽  
Graft Fixation ◽  
Flexion Angle ◽  
Patellar Ligament ◽  
Graft Material ◽  
Test Apparatus ◽  
Cranial Cruciate Ligament ◽  
Tibial Insertion

SummaryA test apparatus that allowed the stifle to move in five degrees of freedom was used to determine the effect of graft location, graft preload, and flexion angle at the time of graft fixation on the tensile graft forces experienced by a replacement graft material used to simulate reconstruction of the cranial cruciate ligament deficient stifle. Two graft locations (tibial insertion site of the patellar ligament and tibial insertion site of the cranial cruciate ligament), two graft preloads (5 N and 20 N), and three flexion angles at the time of graft fixation (15°, 30° and 90°) were examined. The tibial insertion site and preload did not have as great an effect on graft force as did the flexion angle of the limb at time of graft fixation. Graft forces were highest when reconstructions were performed with the limb in 90° of flexion (ρ <0.0001). This study supports the notion that intracapsular grafts should be fixed with the limb in a normal standing angle.A five degree of freedom test apparatus was used to evaluate the effect of graft location, graft preload, and limb flexion angle at time of graft fixation on reconstructions of the cranial cruciate ligament deficient stifle. Our results suggest that intracapsular grafts should not be fixed with the limb in 90° of flexion, but in a normal standing angle.

Improvement in the Fock test for determining the reactivity of dissolving pulp

TAPPI Journal ◽  
2013 ◽  
Vol 12 (11) ◽  
pp. 21-26 ◽  
Author(s):  
CHAO TIAN ◽  
LINQIANG ZHENG ◽  
QINGXIAN MIAO ◽  
CHRIS NASH ◽  
CHUNYU CAO ◽  
...  
Keyword(s):  
Moisture Content ◽  
Sodium Hydroxide ◽  
Constant Temperature ◽  
Carbon Disulfide ◽  
Testing Procedure ◽  
Dissolving Pulp ◽  
Water Bath ◽  
Testing Conditions ◽  
Pulp Sample ◽  
Fock Reactivity

The Fock test is widely used for assessing the reactivity of dissolving pulp. The objective of this study was to modify the method to improve the repeatability of the test. Various parameters that affect the repeatability of the Fock test were investigated. The results showed that Fock reactivity is dependent on testing conditions affecting the xanthation between cellulose and carbon disulfide, such as the moisture content of the pulp sample, sodium hydroxide (NaOH) concentration, xanthation temperature, carbon disulfide dosage, and xanthation time. The repeatability of the test was significantly improved using the following modified testing procedure: air dried sample in the constant temperature/humidity room, xanthation temperature of 66°F (19°C) in a water bath, xanthation time of 3 h, NaOH concentration of 9% (w/w), and 1.3 mL carbon disulfide.

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