Generic Performance Tests for the Fertilizer Sample Preparation Laboratory

1995 ◽  
Vol 78 (2) ◽  
pp. 294-300
Author(s):  
Robert L Beine ◽  
David H Tompkins ◽  
Kirk R Ranta ◽  
Julio Puentes
Keyword(s):  
Sample Preparation ◽  
Performance Testing ◽  
Empirical Method ◽  
Performance Tests ◽  
Measuring Time ◽  
Fertilizer Sample ◽  
Initial Reduction ◽  
Good Sample ◽  
Almost All ◽  
Ground Material

Abstract Good sample preparation is an essential first step to almost all laboratory analytical procedures. The procedures presented are intended to stimulate interest in generic methods for performance testing of various steps in fertilizer sample preparation, including initial reduction of unground sample, grinding, and mixing. Sample reduction quality is measured by 2 types of procedures, the first using 2 sizes of glass beads for a more theoretical approach, and the second using 2 common fertilizer materials for a more empirical method. Grinding performance is measured by recovery and carryover methods, followed by particle size and uniformity estimates of the ground material. Mixing after grinding is tested by measuring time-to-blend of a segregated mixture.

scholarly journals Combining Performance Testing and Metadata Models to Support Fault Detection and Diagnostics in Smart Buildings

2019 ◽  
Vol 2 (3) ◽  
pp. 28
Author(s):  
Elena Markoska ◽  
Aslak Johansen ◽  
Mikkel Baun Kjærgaard ◽  
Sanja Lazarova-Molnar ◽  
Muhyiddine Jradi ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Fault Detection ◽  
Performance Test ◽  
Performance Testing ◽  
Performance Tests ◽  
Actual Performance ◽  
Hypothetical Scenario ◽  
Wide Range ◽  
Promising Practice

Performance testing of components and subsystems of buildings is a promising practice for increasing energy efficiency and closing gaps between intended and actual performance of buildings. A typical shortcoming of performance testing is the difficulty of linking a failing test to a faulty or underperforming component. Furthermore, a failing test can also be linked to a wrongly configured performance test. In this paper, we present Building Metadata Performance Testing (BuMPeT), a method that addresses this shortcoming by using building metadata models to extend performance testing with fault detection and diagnostics (FDD) capabilities. We present four different procedures that apply BuMPeT to different data sources and components. We have applied the proposed method to a case study building, located in Denmark, to test its capacity and benefits. Additionally, we use two real case scenarios to showcase examples of failing performance tests in the building, as well as discovery of causes of underperformance. Finally, to examine the limits to the benefits of the applied procedure, a detailed elaboration of a hypothetical scenario is presented. Our findings demonstrate that the method has potential and it can serve to increase the energy efficiency of a wide range of buildings.

Evaluation of Current AOAC Fertilizer Sample Preparation Requirements

1993 ◽  
Vol 76 (6) ◽  
pp. 1174-1181
Author(s):  
Natalie Newlon ◽  
Candace Cox-Trout ◽  
Peter Kane
Keyword(s):  
Particle Size ◽  
Sample Preparation ◽  
Sample Size ◽  
Wide Distribution ◽  
Ground Sample ◽  
Fertilizer Sample ◽  
Sample Portion ◽  
Current Sample ◽  
The Relationship ◽  
Better Than

Abstract The official AOAC fertilizer sample preparation requires that all dry mixtures be ground to pass a U.S. No. 40 sieve. With current fertilizers and mechanical grinders, these criteria may no longer be appropriate. Blended fertilizers were ground and sieved, and the fractions were analyzed separately to show potential variability in results. In general, potassium was heavily concentrated in the smaller particles of the ground sample, whereas phosphorus tended to be concentrated in the coarser particles. A representative set of fertilizers was subjected to 7 grinding treatments designed to produce samples with a wide distribution of particle size. N, P, and K were determined in the samples by traditional methods. Analysis of the results demonstrated that precise, accurate results could be obtained from samples that did not technically meet current sample preparation requirements. The relationship between fineness of grind and size of the analytical sample portion was examined. With proper sample grinding, sample sizes of ≤20 mg could give representative results for nitrogen analysis, with precision equal to or better than traditional Kjeldahl analysis using 1 g samples. This is of particular interest, because various combustion instruments now becoming popular for nitrogen analysis are limited in sample size.

Relationship between central performance test for growth in Hereford bulls and growth and carcass traits of progeny

1984 ◽  
Vol 39 (3) ◽  
pp. 371-382 ◽  
Author(s):  
R. L. Baker ◽  
B. W. Wickham ◽  
C. A. Morris
Keyword(s):  
New Zealand ◽  
Environmental Effects ◽  
Performance Test ◽  
Carcass Traits ◽  
Live Weight ◽  
Dairy Herds ◽  
Performance Tests ◽  
Critical Factors ◽  
Low Performance ◽  
Almost All

ABSTRACTFour central performance tests of growth in Hereford bulls from about 10 to 19 months of age on pasture were conducted in New Zealand. From the 100 bulls performance tested 63 were representatively sampled, including bulls with high and low performance test rankings, and progeny tested in dairy herds. Crossbred progeny were purchased from the dairy herds at 3 to 4 months of age, assembled in one location and reared together on pasture for 14 to 15 months prior to slaughter. Regressions of progeny growth and carcass traits on a number of different performance traits for growth of their sires were in almost all cases not statistically significant. The effective heritability, from offspring-sire regression, was 0·07 (s.e. 0·05) for final live weight and 009 (s.e. 0·06) for post weaning gain from about 200 to 550 days of age. It is concluded that central performance tests, as presently conducted in New Zealand, are of limited value for ranking breeding values of bulls for growth. Possible reasons for these results are discussed. It is suggested that pre-test environmental effects and age at the start of the central test are critical factors.

scholarly journals Performance analysis of languages working on Java Virtual Machine based on Java, Scala and Kotlin

2020 ◽  
Vol 15 ◽  
pp. 189-195
Author(s):  
Katarzyna Buszewicz
Keyword(s):  
Performance Analysis ◽  
Virtual Machine ◽  
Performance Testing ◽  
Java Virtual Machine ◽  
Performance Tests ◽  
Literature Study ◽  
Runtime Environment

This article presents the results of a literature study related to the construction and operation of Java Virtual Machine, as well as performance tests of selected languages using the aforementioned runtime environment on the example of Java, Scala and Kotlin. Performance testing was carried out using two applications built using the Apache Maven archetype with the built-in Java Microbenchmark Harness library.

scholarly journals Towards Representative Web Performance Measurements with Google Lighthouse

2021 ◽  
Author(s):  
Tjaša Heričko ◽  
Boštjan Šumak ◽  
Saša Brdnik
Keyword(s):  
Performance Measurement ◽  
Performance Testing ◽  
Performance Tests ◽  
Performance Measurements ◽  
Web Performance ◽  
Reasonable Time ◽  
Empirical Results ◽  
Common Task ◽  
Measurement Results

Web performance testing with tools such as Google Lighthouse is a common task in software practice and research. However, variability in time-based performance measurement results is observed quickly when using the tool, even if the website has not changed. This can occur due to variability in the network, web, and client devices. In this paper, we investigated how this challenge was addressed in the existing literature. Furthermore, an experiment was conducted, highlighting how unrepresentative measurements can result from single runs; thus, researchers and practitioners are advised to run performance tests multiple times and use an aggregation value. Based on the empirical results, 5 consecutive runs using a median to aggregate results reduce variability greatly, and can be performed in a reasonable time. The study’s findings alert to p otential pitfalls when using single run-based measurement results and serve as guidelines for future use of the tool.

Standardized Performance Tests and Their Impact on the Decisions Determining the Type of Rehabilitation Program

1987 ◽  
Vol 15 (4) ◽  
pp. 253-260 ◽  
Author(s):  
Anders Foldspang
Keyword(s):  
Vocational Rehabilitation ◽  
Performance Testing ◽  
Clinical Work ◽  
Early Discharge ◽  
Testing Procedure ◽  
Rehabilitation Program ◽  
Performance Tests ◽  
Test Results ◽  
Case Closure ◽  
The Impact

In the health and social sectors, many diagnostic and prognostic tests are carried out without a constant watch on (1) what influence the test results have on decisions, and (2) the impact of these decisions on every day clinical work. Consequently, it is not known whether the additional information gained, if any, justifies the expenditure necessary for resources involved in a testing procedure. In fact, the net impact of testing in every day clinical work may be negative. By carrying out a testing procedure, under the before mentioned conditions, resources would be wasted. Since the early 1970's a battery of standardized performance tests have been used at the Vocational Rehabilitation Clinic in Aarhus, Denmark. Originally, the aim of the tests was to identify and give an early discharge to those clients, that were, in any case, shown to be fit for a social pre-term pension. An early discharge of these clients would enable the Clinic to counsel a greater number of clients who were suited to vocational rehabilitation. The test period lasts two weeks, and the average stay in the Clinic amounts to about 3 months. During the years 1981 to 1983, a total of 607 clients were discharged from the Clinic. Out of the 607, 379 had been given the battery of tests. Those tested stayed 16 days longer at the clinic than the rest of the clients. A few clients got an early discharge. The associations between the test results and case closure status were weak. Furthermore, these weak associations occurred in 6 out of 51 tests. On the other hand, case closure status could be predicted on the basis of already available demographic, social, and health information on the individual clients. The conclusion is, that standardized performance testing seems to have raised the resource consumption of the clinic without any demonstrable benefit in terms of client selection. The need for continuous socio-medical and epidemiological evaluation of rehabilitation tests and procedures is stressed.

Performance Assessment in Language Testing

1995 ◽  
Vol 15 ◽  
pp. 188-211 ◽  
Author(s):  
Elana Shohamy
Keyword(s):  
Performance Assessment ◽  
Theory Development ◽  
Performance Testing ◽  
Language Testing ◽  
Performance Tests ◽  
The Past ◽  
Major Shift ◽  
And Performance

In the past two decades, there has been a major shift in language testing towards the development and use of performance tests. The basis for this shift is the expectation that such tests would assess a more valid construct of what it really means to know a language. The purpose of this chapter is to review th topic of performance testing by focusing on its definitions, theory, development, and research. The chapter will begin with a review of the different definitions of performance testing and provide examples of the types of performance tests that have been developed and used. The chapter will then examine the extent to which performance tests have drawn upon the theoretical discussions of competence and performance. The next section will describe the research that has been carried out on performance tests. The chapter will end with an agenda for development and research on the manyu unanswered questions concerning performance testing.

scholarly journals Source of variation and heritability of directly measured traits in performance testing of Simmental bulls

Genetika ◽  
2012 ◽  
Vol 44 (1) ◽  
pp. 153-162
Author(s):  
Vladan Bogdanovic
Keyword(s):  
Performance Test ◽  
Growth Traits ◽  
Statistical Significance ◽  
Performance Testing ◽  
Test Group ◽  
The Body ◽  
Components Of Variance ◽  
Body Development ◽  
Heritability Estimates ◽  
Almost All

In order to study the variability and heritability of directly measured traits (growth and body development traits) in performance test of Simmental bulls the data on 371 bulls born and tested over the period of 13 years were used in the analysis. The data were analyzed in order to estimate year and month of calving, herd of origin and group in test effect as well as error components. The components of variance were obtained using restricted maximum likelihood (REML) methodology applied to sire model. The year and month of birth had different effect on the variability of the growth traits, while the herd of origin and the test group manifested a consistent, highly significant effect on those growth traits which they could have an effect on. On the other hand, all the body development traits were under a constant and highly significant effect manifested by the year of calving, while the month of calving manifested its effect, during test, at different levels of statistical significance. A decreased effect of herd of origin on almost all body dimensions from the start until the end of performance test was universally observed. Heritability estimates for pre-test ADG, in-test and lifetime ADG were 0.27, 0.39 and 0.29, respectively. Heritability estimates for body weights were 0.23, 0.25, and 0.30 for birth weight, test-on weight, and test-off weight, respectively. Heritability estimates for test-off height at withers, circumference of chest, depth of chest and body length were 0.43, 0.30, 0.33 and 0.29.

scholarly journals Conformity of Physical Characteristics of Imported Tires with Government Standards: A Case Study

2004 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
N.T. Ratrout ◽  
S. Anwar Basha ◽  
H. I. Al-Abdul Wahhab ◽  
K. A. Al-Ofi
Keyword(s):  
Tensile Strength ◽  
High Speed ◽  
Visual Inspection ◽  
Performance Tests ◽  
Tensile Strength Test ◽  
Dimension Measurement ◽  
Strength Tests ◽  
Speed Performance ◽  
Almost All

The Saudi Arabian Standards Organization, SASO, has established a set of tests that all passenger car tires have to pass in order to be allowed into the Country. These tests are: visual inspection, dimension measurement, bead unseating, tensile strength and elongation, aging, endurance, and high speed performance tests. This paper describes the application of the first five tests on eight different brands of tires that are taken to represent the categories of “frequently failed” and “infrequently failed” tires in the country. The results showed that the dimensions of almost all the tested tires were somewhat different from those documented in the SASO standards. On the other hand, all the tested tires passed the bead unseating and strength tests. All tires in the “frequently failed” category failed the tensile strength test. In contrast, all tires from the “infrequently failed” category passed this test. The average values of the test for these two tire categories were statistically different at a 95% confidence level.  

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