scholarly journals Now, an independent laboratory that offers more than reliable test results

1981 ◽  
Vol 59 (46) ◽  
pp. 11
Keyword(s):  
Test Results ◽  
Reliable Test ◽  
Independent Laboratory

Test Reliability of Impurity Parameters of Uster AFIS

2011 ◽  
Vol 331 ◽  
pp. 516-527
Author(s):  
Peng Zi Sun ◽  
Ji Peng Cao
Keyword(s):  
Statistical Analysis ◽  
Test Reliability ◽  
Test Time ◽  
Test Results ◽  
Analysis Method ◽  
Sample Weight ◽  
Reliable Test ◽  
Sampling Process ◽  
Statistical Analysis Method ◽  
Card Sliver

This paper presents test reliablity of Uster AFIS for impurity test by calculating the Reliable Test Time (hereinafter referred to as RTT) and CV% of test results. The CV% value of test results of impurity-related parameters in card sliver obtained in 8 experiments totally with 313 different plans were calculated. By statistical analysis method, the reliable test time of AFIS for some impurity-related parameters was estimated. It is concluded that the impurity result obtained by 10-time tests with AFIS was inaccurate. The reasons for this are that the sample weight is too small, the impurity is unevenly distributed and the impurity in card sliver may have some loss in the manually-sampling process.

Calibration of ultrasound tester delay time by cutting a wooden beam

2020 ◽  
Vol 110 ◽  
pp. 131-139
Author(s):  
Zbigniew Karwat
Keyword(s):  
Time Delay ◽  
Ultrasonic Wave ◽  
Independent Method ◽  
Measured Signal ◽  
Test Results ◽  
Measuring Device ◽  
Reliable Test ◽  
Metal Disc ◽  
Standard Calibration ◽  
Signal Time

Obtaining precise and reliable test results requires specific tools on one hand, and at the same time, reliability of the results should not be questioned. One of the necessary steps to achieve this goal is the calibration of the measuring device before the test. This article describes an experiment involving calibration of the device by an independent method called cutting beam calibration carried out on the ultrasonic material tester UMT 01. The standard calibration of this device is carried out by using a dedicated metal disc as a template. Calibration of the tester consisted of determining the time delay of the measured signal. The obtained results were used to prepare charts and to determine of signal time delay, called correction, which also allowed determining the velocity of ultrasonic wave in the tested material in three ways. The experiment was conducted on samples of three species of wood: Norway spruce, Scots pine and sycamore. The velocity of ultrasonic wave from research was compared with literature data.

scholarly journals Evaluating Concentrations of Pesticides and Heavy Metals in the U.S. Peanut Crop in the Presence of Detection Limits

2017 ◽  
Vol 44 (2) ◽  
pp. 124-133 ◽  
Author(s):  
Benjamin F. Blair ◽  
Marshall C. Lamb
Keyword(s):  
Censored Data ◽  
Detection Limits ◽  
Descriptive Statistics ◽  
Test Results ◽  
Independent Laboratory ◽  
Peanut Crop ◽  
Peanut Production ◽  
Cadmium Lead ◽  
Mean Concentration ◽  
The U.S

ABSTRACT The concentration of mercury, cadmium, lead, and arsenic along with glyphosate and an extensive array of pesticides in the U.S. peanut crop was assessed for crop years 2013-2015. Samples were randomly selected from various buying points during the grading process. Samples were selected from the three major growing regions in order to attain a representative sample of U.S. peanut production. Samples were sent to an independent laboratory for testing. Appropriate statistical techniques were used to account for censored data due to test results below detection limits. Descriptive statistics and confidence intervals for the population mean concentration are presented where possible. For heavily censored data, the probability of a random sample from the population testing below the detection limit is estimated. Overall, concentrations were found to be low relative to health standards and consistent across crop years.

scholarly journals The Validation of Neogen Reveal® Q+ for DON

2020 ◽  
Vol 103 (1) ◽  
pp. 176-183
Author(s):  
R Lucas Gray ◽  
Alex Kostin ◽  
Gabrielle Anderson ◽  
Brooke Roman ◽  
Frank Klein ◽  
...  
Keyword(s):  
Reference Values ◽  
Brown Rice ◽  
Cross Reactivity ◽  
Aqueous Sample ◽  
Test Results ◽  
Independent Laboratory ◽  
Sample Extraction ◽  
Reliable Performance ◽  
Expiration Dating

Abstract Background: Reveal® Q+ for DON is an immunochromatographic test for quantitative determination of deoxynivalenol (DON) in grains. Objective: A study was conducted to validate performance of this method for determination of DON in naturally contaminated corn and wheat and in DON-spiked corn/soy blend, soybeans, barley, malted barley, buckwheat, brown rice, sorghum, and distillers dried grain. Methods: In addition to matrix testing, LOD, linearity, selectivity, robustness, and stability/lot-to-lot consistency testing were performed. Results: The LOD was determined to be 0.014 ppm in corn and 0.037 ppm in wheat, and the LOQ 0.042 ppm in corn and 0.11 ppm in wheat. Recovery ranged from 90 to 104% across a range of reference values of 0.5 to 34.5 ppm. Linearity calculation comparing test results with reference values produced R2 values of 0.999 in both matrixes. Internal results with corn and wheat were corroborated in independent laboratory testing. For DON-spiked commodities, mean recovery across a range of DON concentration from 0.5 to 30 ppm ranged from 90 to 109%. Results of selectivity testing showed no cross-reactivity with other mycotoxins and no interference in detection of DON. Reagent lot-to-lot consistency and stability studies showed consistent results across a range of DON levels and established expiration dating for the test of 18 months after manufacture when stored under specified conditions. Conclusions and Highlights: The Reveal Q+ for DON test offers reliable performance as well as the advantages of aqueous sample extraction, procedural simplicity, minimal labor and equipment requirements, and rapid results. Conclusions: The Reveal Q+ for DON test is validated as a Performace Tested Method in Corn, Wheat, and a variety of other grains. Highlights: The test provides rapid results from a simple aqueous extraction and requires minimal labor and equipment.

Assuring Reliable Performance of Antibiotic Assay Media

1977 ◽  
Vol 60 (6) ◽  
pp. 1261-1265
Author(s):  
Katharine A Freeman ◽  
Diana P Johnson ◽  
Mary A Garth
Keyword(s):  
Microbiological Assay ◽  
Physical Factors ◽  
Control Medium ◽  
Test Results ◽  
Test Medium ◽  
Reliable Test ◽  
Reliable Performance ◽  
The Media ◽  
And Performance

Abstract The Microbiological Assay Branch of the National Center for Antibiotics Analysis assays over 100,000 samples of antibiotic products annually, using more than 1000 lb dehydrated media. The media must be consistently dependable to produce accurate, reliable test results. To assure that the supply of media will meet the established requirements, each lot before purchase is subjected to a series of trials designed to examine growth support, sensitivity, and behavioral and physical factors. Actual antibiotic assays are conducted with the test medium, and performance is rated against a control medium. Controls on the system reduce the variables to allow appraisal of the medium itself.

scholarly journals Fractal Analysis of Laplacian Pyramidal Filters Applied to Segmentation of Soil Images

2014 ◽  
Vol 2014 ◽  
pp. 1-13
Author(s):  
J. de Castro ◽  
F. Ballesteros ◽  
A. Méndez ◽  
A. M. Tarquis
Keyword(s):  
Image Processing ◽  
Fractal Analysis ◽  
Classical Problem ◽  
Basis Functions ◽  
Test Results ◽  
Threshold Values ◽  
Laplacian Pyramid ◽  
Reliable Test ◽  
Local Operators ◽  
Fractal Filters

The laplacian pyramid is a well-known technique for image processing in which local operators of many scales, but identical shape, serve as the basis functions. The required properties to the pyramidal filter produce a family of filters, which is unipara metrical in the case of the classical problem, when the length of the filter is 5. We pay attention to gaussian and fractal behaviour of these basis functions (or filters), and we determine the gaussian and fractal ranges in the case of single parametera. These fractal filters loose less energy in every step of the laplacian pyramid, and we apply this property to get threshold values for segmenting soil images, and then evaluate their porosity. Also, we evaluate our results by comparing them with the Otsu algorithm threshold values, and conclude that our algorithm produce reliable test results.

scholarly journals Construction and validation of a test of knowledge of contraceptive methods for adolescents

2021 ◽  
Author(s):  
Karla Elisa Cervantes-Jácome ◽  
Silvia Susana Robles Montijo ◽  
José Cristóbal Pedro Arriaga Ramírez ◽  
Juan José Sánchez Sosa
Keyword(s):  
Reliability Index ◽  
Complete Information ◽  
Test Results ◽  
Contraceptive Methods ◽  
Collection Site ◽  
Reliable Test ◽  
Advantages And Disadvantages ◽  
Difficulty Index ◽  
Index Value ◽  
Test Of Knowledge

Background: Valid and reliable instruments are required to measure the level of information on contraceptive methods in adolescents to promote their correct use. Objective: To construct and validate a test of knowledge of contraceptive methods for adolescents between 15 and 19 years old. Method: A 36-item test was developed that included the different contraceptive methods and information on the characteristics, use, efficacy, advantages and disadvantages of these methods. Once validated by expert judges, a college in Ecatepec was randomly selected as data collection site. Students of the three school grades answered the test. Results: The test was applied to a total of 229 students between 15 and 19 years old (M = 16.22; SD = .978). The majority were women (66%), single (88.5%) and lived with their parents (62.9%). Of the 36 initial items, 31 showed discriminatory power between those who performed well on the test and those who did not. The difficulty index of the questionnaire was .45 and revealed a reliability index value of .739. Around 60% of the participants obtained a percentage below 50% of correct answers in the entire test. Only about 4% of participants got a percentage of correct responses higher than 70%. The categories of characteristics and use were those in which the participants performed best when answering 48% of these questions correctly. The worst was effectiveness, advantages and disadvantages with 33%. Conclusion: The test’s psychometric properties showed that it is a valid and reliable test for its application in Mexican adolescents. The results indicate that most adolescents of the simple do not have complete information about contraceptive methods and that they know the least about their effectiveness and side effects.

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