Lethargy groups

This assumption is apparently made in all time independent diffusion codes which are accelerated by means of Chebyshev polynomials. (See, for example, [46].) It has not been proved to be true for general heterogeneous reactor models in n dimensions except for the trivial cases of only one lethargy group and homogeneous bare problems. 

As an example of the use of Eq. (8.408), consider the case of a reactor medium for which the materials and lethargy groups are so chosen that fissions are caused only by thermal neutrons and neutrons from fission appear only in the highest lethargy group, thus... 

The calculation begins with the first lethargy group. A differential equation of the form... 

EAEF energy of the average lethargy group for fission... 

The calculated value of k-efifective was 1.00920 0.00108 (KENO-V.a, 238 groups, ENDF/B-V). The energy of the average lethargy group for fission was 665 keV, a considerably faster system than the reference fuel for the SSR. 

SICK BUILDING SYNDROME A group of symptoms more common in workers in certain buildings and which are temporarily related to working in them. Symptoms include lethargy, tiredness, headache also sore/dry eyes, dry throat, dry skin, symptoms suggestive of asthma, blocked or runny nose. Cause is multifunctional but does include agents encountered in the workplace. 

In adult patients, the manifestations of PCP use can be grouped into nine clinical patterns of intoxication. Four of these are called major patterns because they may be associated with severe toxicity and often necessitate hospitalization. Patients with major patterns are usually unpredictable symptoms wax and wane, and the patient may abruptly change from one pattern of intoxication to another. Five other symptom complexes are designated as minor patterns since toxicity is usually mild and of short duration. Major Patterns consist of coma, catatonic syndrome, toxic psychosis, and acute brain syndrome. Minor Patterns are lethargy, bizarre behavior, violent behavior, agitation, and euphoria (McCarron et al. 1981b). 

As compared to a control group of 27 infants, the PCP-exposed newborns had rapid changes in their levels of consciousness, with lethargy alternating with irritability. Furthermore, these... 

Cobalamin-c disease remethylation of homocysteine to methionine also requires an activated form of vitamin B12. In the absence of normal B12 activation, homocystinuria results from a failure of normal vitamin B12 metabolism. Complementation analysis classifies defects in vitamin B12 metabolism into three groups cblC (most common), cblD and cblF. Most individuals become ill in the first few months or weeks of life with hypotonia, lethargy and growth failure. Optic atrophy and retinal changes can occur. Methylmalonate excretion is excessive, but less than in methylmalonyl-CoA mutase deficiency, and without ketoaciduria or metabolic acidosis. 

Carbamyl phosphate synthetase deficiency. Carbamyl phosphate synthetase deficiency is rare. Neonates quickly develop lethargy, hypothermia, vomiting and irritability. The hyperammonemia typically is severe, even exceeding 1 mmol/1. Occasional patients with a partial enzyme deficiency have had a relapsing syndrome of lethargy and irritability upon exposure to protein. Brain damage can occur in both neonatal and late-onset groups. 

Pig 8 Inhalation 50,100,150 4 wk At 100 and 150 ppm, lethargy, nasal secretions, coughing, tracheal inflammation. Excessive lacrimation reduced weight gain observed in all exposure groups. LOAEL 50 Drummond etal. 1980... 

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