Stub column test procedure

1991 ◽  
pp. 393-394
Keyword(s):  
Test Procedure ◽  
Column Test ◽  
Stub Column

scholarly journals REDUCTION IN AMMONIUM IONS IN SLUDGE LIQUOR / VIENAS IŠ BŪDŲ MAŽINTI AMONIO JONŲ KONCENTRACIJĄ DUMBLO VANDENYJE

2013 ◽  
Vol 5 (4) ◽  
pp. 461-465
Author(s):  
Eglė Šlajūtė ◽  
Aušra Mažeikienė
Keyword(s):  
Research Study ◽  
Wastewater Treatment Plants ◽  
Negative Impact ◽  
Test Procedure ◽  
Additional Treatment ◽  
Column Test ◽  
Ammonium Ions ◽  
Digested Sludge ◽  
Sludge Treatment ◽  
Treatment Processes

Liquor rejected from the centrifugation of the digested sludge can contain the concentrations of ammonium ions up to 1750 mg/L. These loads are usually returned to the intake of wastewater treatment plants (WWTP) without additional treatment and can have a negative impact on biological wastewater and/or sludge treatment processes, e.g. phosphorus and nitrogen removal. This article deals with the use of naturally obtained sorbent, zeolite, in batch and column test procedure for removing ammonium from the rejected liquor. This research study was carried out using different sizes of zeolite particles: 0.8–1.6 mm and 1.6–2.5 mm. The highest efficiency of ammonium removal (up to 98 %) was achieved by applying the zeolite particles of 0.8–1.6 mm. Article in Lithuanian. Santrauka Sausinant pūdytą dumblą centrifugomis išsiskiria skystis, kuriame gali būti didelės amonio jonų koncentracijos (iki 1750 mg/l). Taip užterštas ir papildomai nevalytas dumblo vanduo, grąžinamas į nuotekų valymo įrenginių pradžią, gali trukdyti nuotekų ar dumblo valymo procesams, būtent, kai siekiama pašalinti azotą ir fosforą. Nagrinėjamas gamtinio sorbento ceolito panaudojimas amonio jonams šalinti iš dumblo vandens maišaluose ar skystį filtruojant pro ceolito užpildus. Tyrimams naudota 0,8–1,6 mm ir 1,6–2,5 mm dydžio ceolito grūdeliai. Didžiausias amonio jonų šalinimo iš skysčio efektyvumas (iki 98 %) buvo pasiektas, kai ceolito grūdeliai 0,8–1,6 mm dydžio.

Closure to “Significance and Application of Stub Column Test Results”

1972 ◽  
Vol 98 (6) ◽  
pp. 1331-1331
Author(s):  
Ching K. Yu ◽  
Lambert Tall
Keyword(s):  
Test Results ◽  
Column Test ◽  
Stub Column

Significance and Application of Stub Column Test Results

1971 ◽  
Vol 97 (7) ◽  
pp. 1841-1861
Author(s):  
Ching K. Yu ◽  
Lambert Tall
Keyword(s):  
Test Results ◽  
Column Test ◽  
Stub Column

Benefits from Computerized Adaptive Testing as Seen in Simulation Studies

1999 ◽  
Vol 15 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Lutz F. Hornke
Keyword(s):  
Measurement Error ◽  
Computerized Adaptive Testing ◽  
Test Procedure ◽  
Adaptive Testing ◽  
Parameter Estimates ◽  
Simulation Studies ◽  
Computerized Adaptive Test ◽  
Item Banks ◽  
Item Parameters ◽  
General Reliability

Summary: Item parameters for several hundreds of items were estimated based on empirical data from several thousands of subjects. The logistic one-parameter (1PL) and two-parameter (2PL) model estimates were evaluated. However, model fit showed that only a subset of items complied sufficiently, so that the remaining ones were assembled in well-fitting item banks. In several simulation studies 5000 simulated responses were generated in accordance with a computerized adaptive test procedure along with person parameters. A general reliability of .80 or a standard error of measurement of .44 was used as a stopping rule to end CAT testing. We also recorded how often each item was used by all simulees. Person-parameter estimates based on CAT correlated higher than .90 with true values simulated. For all 1PL fitting item banks most simulees used more than 20 items but less than 30 items to reach the pre-set level of measurement error. However, testing based on item banks that complied to the 2PL revealed that, on average, only 10 items were sufficient to end testing at the same measurement error level. Both clearly demonstrate the precision and economy of computerized adaptive testing. Empirical evaluations from everyday uses will show whether these trends will hold up in practice. If so, CAT will become possible and reasonable with some 150 well-calibrated 2PL items.

Evaluating the Validity of a Bayesian Program for Predicting Stage in Hodgkin’s Disease

1981 ◽  
Vol 20 (03) ◽  
pp. 174-178 ◽  
Author(s):  
A. I. Barnett ◽  
J. Cynthia ◽  
F. Jane ◽  
Nancy Gutensohn ◽  
B. Davies
Keyword(s):  
New England ◽  
Hodgkin's Disease ◽  
Bayesian Model ◽  
Medical Center ◽  
Hodgkin’S Disease ◽  
Test Procedure ◽  
Disease Patient ◽  
Probabilistic Information ◽  
Probabilistic Forecasts ◽  
England Medical

A Bayesian model that provides probabilistic information about the spread of malignancy in a Hodgkin’s disease patient has been developed at the Tufts New England Medical Center. In assessing the model’s reliability, it seemed important to use it to make predictions about patients other than those relevant to its construction. The accuracy of these predictions could then be tested statistically. This paper describes such a test, based on 243 Hodgkin’s disease patients of known pathologic stage. The results obtained were supportive of the model, and the test procedure might interest those wishing to determine whether the imperfections that attend any attempt to make probabilistic forecasts have gravely damaged their accuracy.

Reliability of Laboratory Tests for the Control of Oral Anticoagulation

1974 ◽  
Vol 32 (02/03) ◽  
pp. 483-491
Author(s):  
E. A Loeliger ◽  
M. J Boekhout-Mussert ◽  
L. P van Halem-Visser ◽  
J. D. E Habbema ◽  
H de Jonge
Keyword(s):  
Human Brain ◽  
Laboratory Tests ◽  
Test Procedure ◽  
Rabbit Brain ◽  
Normal Range ◽  
Test Procedures ◽  
Discrimination Power ◽  
Power Of The Test ◽  
Assay Procedure ◽  
Low Sensitivity

SummaryThe present study concerned the reproducibility of the so-called prothrombin time as assessed with a series of more commonly used modifications of the Quick’s onestage assay procedure, i.e. the British comparative reagent, homemade human brain thromboplastin, Simplastin, Simplastin A, and Thrombotest. All five procedures were tested manually on pooled lyophilized normal and patients’ plasmas. In addition, Simplastin A and Thrombotest were investigated semiautomatically on individual freshly prepared patients’ plasmas. From the results obtained, the following conclusions may be drawn :The reproducibility of results obtained with manual reading on lyophilized plasmas is satisfactory for all five test procedures. For Simplastin, the reproducibility of values in the range of insufficient anticoagulation is relatively low due to the low discrimination power of the test procedure in the near-normal range (so-called low sensitivity of rabbit brain thromboplastins). The reproducibility of Thrombotest excels as a consequence of its particularly easily discerned coagulation endpoint.The reproducibility of Thrombotest, when tested on freshly prepared plasmas using Schnitger’s semiautomatic coagulometer (a fibrinometer-liJce apparatus), is no longer superior to that of Simplastin A.The constant of proportionality between the coagulation times formed with Simplastin A and Thrombotest was estimated at 0.64.Reconstituted Thrombotest is stable for 24 hours when stored at 4° C, whereas reconstituted Simplastin A is not.The Simplastin A method and Thrombotest seem to be equally sensitive to “activation” of blood coagulation upon storage.

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