Geotextile Filtration Performance Test

2009 ◽  
pp. 273-273-12 ◽  
Author(s):  
CM Montero ◽  
LK Overmann
Keyword(s):  
Performance Test ◽  
Filtration Performance

Alternative Particle Number Filtration Performance Test Method

2017 ◽  
Author(s):  
Masaaki Ito ◽  
Frank Katsube ◽  
Yasuhiko Hamada ◽  
Hiroaki Ishikawa ◽  
Tsuyoshi Asako
Keyword(s):  
Particle Number ◽  
Performance Test ◽  
Test Method ◽  
Filtration Performance

scholarly journals Effect of Groove Shape on Head Loss and Filtration Performance of Disc Filters

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1683
Author(s):  
Sang-ik Lee ◽  
Jin-Yong Choi ◽  
Won Choi
Keyword(s):  
Performance Test ◽  
Filter Design ◽  
Head Loss ◽  
Sectional Area ◽  
Cross Sectional ◽  
Loss Analysis ◽  
Groove Shape ◽  
Filtration Performance ◽  
Sectional Shape ◽  
The Relationship

To analyze the effect of a groove cross-sectional shape on disc filters, a head loss analysis and filtration performance test were conducted using disc filters with different groove shapes (semi-elliptical- and trapezoidal-shaped grooves). Furthermore, the groove shapes were analyzed using field emission scanning electron microscopy and the relationship between flow rate and head loss was derived from the head loss test. Even if the filters were designed with the same mesh standard, the sectional areas of the grooves were different depending on the shape. Therefore, the head loss was compared under the condition that the grooves have the same sectional area by applying the relationship between head loss and sectional area, and a smaller head loss was observed in the semi-elliptical-shaped groove. Additionally, the semi-elliptical-groove-shaped disc filter was evaluated to sufficiently filter the soil particles corresponding to the 120 mesh standard. Therefore, an optimum disc filter can be designed by considering the cross-sectional shape of the disc groove to reduce energy consumption and provide stable filtration. The elliptical groove shape, which is hydraulically advantageous, is preferred for the disc filter design.

scholarly journals Lab-scale design of two layers wood cellulose filter media to maximize life span for intake air filtration

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qian Yang ◽  
Guodong Zhao ◽  
Yinglong Wu ◽  
Bianzhi Zhang ◽  
Jianquan Hu ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Life Span ◽  
Performance Test ◽  
Single Layer ◽  
Initial Pressure ◽  
Cost Effective ◽  
Composition Gradient ◽  
Filter Media ◽  
Filtration Performance ◽  
Overall Efficiency

AbstractThe requirement of continuous and stringent growth on filtration performance, including longer life span, higher overall efficiency, lower initial pressure drop and more cost effective, has still drove filter media manufactures to research and develop. One of the possible way to achieve these challenges, was to utilize a dual-channel head-box with two sets of pulp conveying system, which can produce filter media with bulky and gradient properties. In this study, three kinds of commercial cellulose were chosen to make two layers filtration media, analyzed the effect of fiber blend on physical properties and filtration performance. By fine-tune the slurry ratio of top layer, we made one single layer and two layers composition filter media, the thickness and air permeability of composition media were higher than single layer media. According to ISO 5011, filtration performance test has been done to compare single layer media with composition media, this composition gradient profiles that provided the life span 37.0% improvement to the terminal pressure drop during dust injecting, and the dust hold capacity improved 34.7%, the main contributor of dust hold capacity was decided by top layer, however, the overall efficiency was depended on wire side layer.

scholarly journals D26 Filtration performance test by single-pass test method

2006 ◽  
Vol 2006.59 (0) ◽  
pp. 111-112
Author(s):  
Yuya KATO ◽  
Kenji SUZUKI ◽  
Eizo URATA
Keyword(s):  
Performance Test ◽  
Test Method ◽  
Single Pass ◽  
Filtration Performance

Can Behavioral Speech-In-Noise Tests Improve the Quality of Hearing Aid Fittings?

2011 ◽  
Vol 7 (1) ◽  
pp. 8-14
Author(s):  
Robert Moore ◽  
Susan Gordon-Hickey
Keyword(s):  
Working Memory ◽  
Speech Perception ◽  
Performance Test ◽  
Hearing Aid ◽  
Speech Perception In Noise ◽  
Speech In Noise ◽  
Acceptable Noise Level ◽  
Perceptual Performance ◽  
Noise Test

The purpose of this article is to propose 4 dimensions for consideration in hearing aid fittings and 4 tests to evaluate those dimensions. The 4 dimensions and tests are (a) working memory, evaluated by the Revised Speech Perception in Noise test (Bilger, Nuetzel, & Rabinowitz, 1984); (b) performance in noise, evaluated by the Quick Speech in Noise test (QSIN; Killion, Niquette, Gudmundsen, Revit, & Banerjee, 2004); (c) acceptance of noise, evaluated by the Acceptable Noise Level test (ANL; Nabelek, Tucker, & Letowski, 1991); and (d) performance versus perception, evaluated by the Perceptual–Performance test (PPT; Saunders & Cienkowski, 2002). The authors discuss the 4 dimensions and tests in the context of improving the quality of hearing aid fittings.

A new motor performance test in a prospective study on children with suspected myopathy

2006 ◽  
Vol 48 (09) ◽  
pp. 739 ◽  
Author(s):  
Willeke A van den Beld ◽  
Gitty AC van der Sanden ◽  
Ton Feuth ◽  
Anjo JWM Janssen ◽  
Rob CA Sengers ◽  
...  
Keyword(s):  
Prospective Study ◽  
Motor Performance ◽  
Performance Test ◽  
A Prospective Study

Contingent Negative Variation (CNV) bei Kindern mit hyperkinetischem Syndrom - eine experimentelle Untersuchung mittels des Continuous Performance Test (CPT)

2000 ◽  
Vol 28 (4) ◽  
pp. 239-246 ◽  
Author(s):  
K. Hennighausen ◽  
G. Schulte-Körne ◽  
A. Warnke ◽  
H. Remschmidt
Keyword(s):  
Contingent Negative Variation ◽  
Performance Test ◽  
Continuous Performance Test ◽  
Continuous Performance ◽  
Experimentelle Untersuchung

Zusammenfassung Fragestellung: Gibt es neurophysiologische Korrelate der Aufmerksamkeitsstörung beim hyperkinetischen Syndrom (HKS) und welche Bedeutung haben diese für die Ätiologie der Störung. Methodik: Selektive Aufmerksamkeitsprozesse wurden anhand des zweistufigen Continuous Performance Test (CPT) bei 18 Jungen mit hyperkinetischem Syndrom (HKS) untersucht und mit einer nach dem Alter parallelisierten Kontrollgruppe von 21 Jungen verglichen. Die Altersspanne der Stichprobe betrug 6 bis 12 Jahre. Parallel dazu wurden ereigniskorrelierte Potentiale (EKP) während des Tests an den Elektrodenpositionen Fz, Cz, Pz und Oz mit Referenz zu verbundenen Ohren abgeleitet. Ergebnisse: Im EKP nach dem präparatorischen Stimulus konnten zwei Komponenten der Contingent Negative Variation (CNV) mit unterschiedlicher topographischer Verteilung identifiziert werden (CNV-1: 600 bis 1100 ms und CNV-2: 1000 bis 1500 ms nach Stimulus). Die Stichproben unterschieden sich nicht auf der Verhaltensebene (Fehlerrate und Reaktionszeit). Signifikante Gruppenunterschiede ergaben sich hinsichtlich der Topographie der beiden CNV-Komponenten. Kinder mit HKS zeigten im Vergleich zu Kontrollkindern eine signifikant niedrigere CNV-1 über der frontalen und eine Tendenz zu stärkerer Negativierung (CNV-1 und CNV-2) über der occipitalen Elektrode. Schlussfolgerungen: Die Ergebnisse unterstützen die Hypothese einer Unterfunktion frontaler inhibitorischer Prozesse bei Kindern mit HKS.

Self-Report vs. Computerized Measures of Impulsivity as a Correlate of Suicidal Behavior

Crisis ◽  
2001 ◽  
Vol 22 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Netta Horesh
Keyword(s):  
Suicidal Behavior ◽  
Attention Deficit Disorder ◽  
Impulse Control ◽  
Performance Test ◽  
Adolescent Suicide ◽  
Continuous Performance Test ◽  
Self Report ◽  
Suicide Attempters ◽  
Computerized Measures ◽  
Adolescent Suicide Attempters

Objectives: To compare the use of a self-report form of impulsivity versus a computerized test of impulsivity in the assessment of suicidal adolescent psychiatric inpatients. Methods: Sixty consecutive admissions to an adolescent in patient unit were examined. The severity of suicidal behavior was measured with the Childhood Suicide Potential Scale (CSPS), and impulse control was measured with the self report Plutchik Impulse Control Scale (ICS) and with the Test of Variables of Attention (TOVA), a continuous performance test (CPT). The TOVA is used to diagnose adolescents with attention deficit disorder. Results: There was a significant but low correlation between the two measures of impulsivity. Only the TOVA commission and omission errors differentiated between adolescent suicide attempters and nonattempters. Conclusions: Computerized measures of impulsivity may be a useful way to measure impulsivity in adolescent suicide attempters. Impulsivity appears to play a small role only in nondepressed suicidal adolescents, especially boys.

Comparing the Mathematics Continuous Performance Test With Other Measures of Tests of Attention

2016 ◽  
Vol 32 (4) ◽  
pp. 291-297 ◽  
Author(s):  
Dubi Lufi ◽  
Shachar Pan
Keyword(s):  
Performance Test ◽  
Continuous Performance Test ◽  
Clinical Population ◽  
Control Group ◽  
Continuous Performance ◽  
Adhd Assessment ◽  
Research Reporting ◽  
Hyperactivity Disorder ◽  
Continuous Performance Tests ◽  
Better Than

Abstract. Several studies have shown that Continuous Performance Tests (CPT) can diagnose Attention Deficit Hyperactivity Disorder (ADHD) better than other tests. Research reporting comparisons of two or more CPT-type tests is scarce. The purpose of the study was to compare the Mathematics Continuous Performance Test (MATH-CPT) with another CPT-type test (CPT II) and a questionnaire (the Brown Scale). The comparison was carried out by looking at correlations among subscales and checking the precision of detecting ADHD. Ninety-five high school and college students participated in the study, 41 with ADHD were the research group and 54 were the control group. The participants performed the two tests and answered the questionnaire. The results showed that the MATH-CPT correctly identified 74.50% of the participants of both groups as compared to the 71.60% of the CPT II. Correlations between the two CPT-type tests were moderate; however, they were similar to correlations found in other studies comparing similar tools. The MATH-CPT, final attention formula, showed significant correlations with the Brown scales, while the CPT II, confidence index associated with ADHD assessment, showed nonsignificant correlations with the questionnaire. The study indicated that MATH-CPT can be used with a clinical population of ADHD and for research purposes.

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