Impact cutting behaviour of forage crops I. Mathematical models and laboratory tests

1978 ◽  
Vol 23 (3) ◽  
pp. 313-328 ◽  
Author(s):  
D.M. McRandal ◽  
P.B. McNulty
Keyword(s):  
Mathematical Models ◽  
Laboratory Tests ◽  
Forage Crops ◽  
Impact Cutting

An Impact Cutting Test for Tire Tread Stocks

1936 ◽  
Vol 9 (3) ◽  
pp. 520-530
Author(s):  
J. H. Dillon
Keyword(s):  
Laboratory Tests ◽  
Testing Machine ◽  
Test Results ◽  
Road Test ◽  
Cutting Resistance ◽  
Cutting Test ◽  
Impact Device ◽  
Impact Cutting ◽  
The Impact

Abstract The impact cutting device described in this paper is recommended for testing the cutting resistance of tread stocks because of its simplicity and the accuracy with which its results agree with road test results. The fact that the device was designed on semi-quantitative theoretical grounds gives some additional confidence in its results. It is possible that other cutting devices, designed with no regard to theory whatsoever, might operate as well as the impact device. However, it is felt that, since most laboratory tests on rubber stocks are necessarily largely empirical, it is well to attempt to design a testing machine which will operate in the ranges of the variables found in service.

scholarly journals Simulation of a ball mill operating with a low ball charge level and a balanced ball size distribution

2013 ◽  
Vol 66 (4) ◽  
pp. 473-477
Author(s):  
Douglas Batista Mazzinghy ◽  
José Guilherme de Abreu Valadares ◽  
Roberto Galéry ◽  
Luiz Cláudio Monteiro Montenegro ◽  
Antônio Eduardo Clark Peres
Keyword(s):  
Mathematical Models ◽  
Size Distribution ◽  
Ball Mill ◽  
Laboratory Tests ◽  
Closed Ball ◽  
Test Material ◽  
Mass Balances ◽  
Ball Size ◽  
Grinding Circuits ◽  
Scale Data

The optimization of industrial grinding circuits has been successfully performed using mathematical models that describe the industrial scale data from breakage parameters determined in laboratory grinding tests. The test material studied here is a gold ore ground in a closed ball mill circuit with hydrocyclone classification. Several sampling campaigns were carried out aiming to produce mass balances and provide material for laboratory tests. The parameters determined in the laboratory tests were used to predict, by simulation, the circuit behavior with a low ball charge level and a balanced ball size distribution.

scholarly journals Models for predicting the performance of fertilizer metering in seed cum fertilizer drill

2021 ◽  
Vol 25 (1) ◽  
pp. 51-57
Author(s):  
Roger T. Spagnolo ◽  
David P. da Rosa ◽  
Marivan da S. Pinho ◽  
Cheiner S. Schiavon ◽  
Diego Schmechel
Keyword(s):  
Mathematical Models ◽  
Laboratory Tests ◽  
Angular Speed ◽  
Transverse Axis ◽  
Helical Pitch ◽  
Inclination Angles ◽  
Longitudinal Discharge ◽  
Linear Manner

ABSTRACT This study aimed to establish mathematical models that predict the performance of helical fertilizer metering according to the longitudinal and transverse inclinations, angular speed, and helical pitch. Laboratory tests were carried out with helical meterings with lateral and longitudinal discharge through overflow and with two helicoids, working at an angular speed of 16 and 46 rpm at the following longitudinal inclination angles: -20, -15, -10, -5, 0, +5, +10, +15, and +20° and on the transverse axis: -15, -10, -5, 0, +5, +10, and +15°. It was found that the variation of the transverse inclination has little effect on the dosage. When using fertilizer metering with a helicoid, the higher the longitudinal inclination, the greater the dosage in a linear manner, while the meterings with two helicoids provided less oscillation of the dosages according to the inclinations.

scholarly journals Interaction of the base and construction under seismic action, with considering various characteristics of soil damping

2018 ◽  
Vol 251 ◽  
pp. 04011
Author(s):  
Evgeny Sobolev ◽  
Armen Ter-Martirosyan
Keyword(s):  
Mathematical Models ◽  
Laboratory Tests ◽  
Clay Soil ◽  
Soil Parameters ◽  
Seismic Action ◽  
Dynamic Tests ◽  
Underground Part ◽  
Dynamic Impact ◽  
Damping Characteristics ◽  
Storey Building

In this paper, we determine the characteristics of the physical damping of sand and clay soil by the results of special laboratory tests. The transition from parameters obtained directly from the results of triaxial dynamic tests to parameters of mathematical models of soils used in modern software complexes is shown. The solution of several dynamic FEM problems is exemplified by PLAXIS PC taking into account different damping characteristics of the ground base of a multi-storey building with a developed underground part. Recommendations are given for selecting a soil model for dynamic impact and dynamic soil parameters, and an analysis of the solutions obtained.

Critical limb ischaemia in diabetes: definition, assessment, prognosis

VASA ◽  
2001 ◽  
Vol 30 (Supplement 58) ◽  
pp. 21-27
Author(s):  
Luther
Keyword(s):  
Diabetic Foot ◽  
Laboratory Tests ◽  
Critical Limb Ischaemia ◽  
Limb Ischaemia ◽  
Clinical Use ◽  
Arterial Reconstruction ◽  
Arterial Circulation ◽  
Diabetic Foot Disease ◽  
Foot Disease ◽  
Fontaine Classification

In diabetic foot disease, critical limb ischaemia (CLI) cannot be precisely described using established definitions. For clinical use, the Fontaine classification complemented with any objective verification of a reduced arterial circulation is sufficient for decision making. For scientific purposes, objective measurement criteria should be reported. Assessment of CLI should rely on the physical examination of the limb arteries, complemented by laboratory tests like the shape of the PVR curve at ankle or toe levels, and arteriography. The prognosis of CLI in diabetic foot disease depends on the success of arterial reconstruction. The best prognosis for the patients is with a preserved limb. Reconstructive surgery is the best choice for the majority of patients.

The Reliability of Retrieval-Induced Forgetting

2012 ◽  
Vol 17 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Rosalind Potts ◽  
Robin Law ◽  
John F. Golding ◽  
David Groome
Keyword(s):  
Individual Differences ◽  
Recognition Test ◽  
Laboratory Tests ◽  
The Other ◽  
Clinical Factors ◽  
Test Items ◽  
T1 And T2 ◽  
Test Materials ◽  
Induced Forgetting

Retrieval-induced forgetting (RIF) refers to the finding that the retrieval of an item from memory impairs the retrieval of related items. The extent to which this impairment is found in laboratory tests varies between individuals, and recent studies have reported an association between individual differences in the strength of the RIF effect and other cognitive and clinical factors. The present study investigated the reliability of these individual differences in the RIF effect. A RIF task was administered to the same individuals on two occasions (sessions T1 and T2), one week apart. For Experiments 1 and 2 the final retrieval test at each session made use of a category-cue procedure, whereas Experiment 3 employed category-plus-letter cues, and Experiment 4 used a recognition test. In Experiment 2 the same test items that were studied, practiced, and tested at T1 were also studied, practiced, and tested at T2, but for the remaining three experiments two different item sets were used at T1 and T2. A significant RIF effect was found in all four experiments. A significant correlation was found between RIF scores at T1 and T2 in Experiment 2, but for the other three experiments the correlations between RIF scores at T1 and T2 failed to reach significance. This study therefore failed to find clear evidence for reliable individual differences in RIF performance, except where the same test materials were used for both test sessions. These findings have important implications for studies involving individual differences in RIF performance.

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