Modelling of the Mark I pool suppression system

A mathematic model of the Mark I type pool suppression system is presented, together with its computer implementation. The time-dependent compressible gas dynamics through the vent system and the bubble formation are described.The pressure, velocity and mass flow rates in the system have been determined. Scaling laws and compressibility effects are studied. The analysis forms the starting point for the determination of the pool swell and the dynamic loading of the torus shell.     

Time delay and similarity effects in facial recognition.

Conducted 4 experiments to investigate the ability to 232 undergraduates to recognize a target person, whom they had previously seen in slides or a film, in a test series of pictures. Exp I, which manipulated time delay between seeing the target and starting the test series (from 4 min to 1 wk), demonstrated that delay had no effect on recognition performance. The other 3 studies manipulated similarity between the target person and the decoy pictures preceding the target in the search series. The greater the target-decoy similarity, the poorer the recognition performance. A significant Target Position * Similarity interaction indicated the presence of a larger performance decrement due to position when similarity level was high. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Lipase from egg of southern corn rootworm

The lipolytic activity in homogenates and aqueous extracts of acetone powders of eggs of the southern corn rootworm (Diabrotica undecimpunctata howardi Barber) was studied. The general properties were determined using as substrate olive oil in an emulsion stabilized by gum arabic. Bovine serum albumin or Triton X-100 were required in the assay system; they protected the enzyme from spontaneous denaturation. The lipase had activity optima at pH 7 and at 45 C. The preparation was inactive towards triacetin, and activity increased in the series tripropionin<tributyrin<trihexanoin< trioctanoin<tridecanoin. Activity towards tridecanoin. Triolein was hydrolyzed to oleic acid and glycerol with no marked accumulation, even transient, of partial glycerides.     

The large scale preparation of chromatographic grade hydroxylapatite and its application in protein separation procedures

Methods are described for both the laboratory and plant scale preparations of hydroxylapatite to give 200 ml and 22 litre settled bed volumes respectively. These materials have an average particle size of 75 μm, give flow rates of up to 45 ml cm^?2h^?1 and bind up to 50 mg protein/ml hydroxylapatite at pH 6.8. Examples of protein separations and purifications on hydroxylapatite are given and the nature and basis of hydroxylapatite chromatography is discussed.     

The hypolipidemic effect of SU-13,437 in rats with natural endogenous hypertriglyceridemia

The oral administration of 25 mg 2-methyl-2-[p-(1,2,3,4-tetrahydro-1-naphthyl)-phenoxy] propionic acid (SU-13,437) per kilogram body weight per day in two-month-old female rats with naturally occurring hypertriglyceridemia resulted in a 31% decrease (P<0.01) in the serum triglyceride concentration after 14 days of treatment, compared with littermate controls receiving diluent (Polyethylene glycol-300) only. Phospholipid, cholesterol, free fatty acid, glucose, red blood cell and white blood cell concentrations were similar in the blood of treated and control animals after 14 days of treatment. Liver total and relative weight was increased as a result of SU-13,437 treatment (P<0.01). The liver total lipid concentration per 10 gm liver decreased (P<0.05) due to a decrease in triglyceride (P<0.01), cholesterol (P<0.01), and free fatty acid (P<0.05) concentration following treatment. The relative liver glycogen concentration was elevated in treated rats at 7 (P<0.01) and 14 (P<0.05) days of treatment.     

Triggered Correlation

This paper shows to what extent an average-response computer can be utilized for computing a cross-correlation function. This type of computer needs synchronization pulses, and the simplest methods of computation are those in which these pulses are directly derived from one of the signals (triggered correlation). The first method is to generate a synchronization pulse whenever the signal crosses a pre-set threshold in any direction. In this case, the computer output function is shown to be proportional to the true correlation function, for Gaussian signals. In a second method, synchronization pulses are produced when the signal crosses the threshold in a specified (e.g., positive) direction. Then the computer output is found to be contaminated by a systematic error, which, in turn, depends on the derivative of the correlation function. These two methods are described in detail, both with respect to the results and to the accuracy obtainable. Several other, less important, methods are only briefly described.     

How do we know psychology's limits?

Discusses T. R. Barnes's (1981) elaboration of P. L. Wachtel's (see record 1980-10864-001) discussion of why psychology is both a particularly easy and difficult field in which to conduct research. (2 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Experiments utilizing FeO4 for purifying water

The reduction of the metal ion content of river and well water by chemical treatment with Na₂FeO₄ has been studied.Pb(II), Cu(II), Zn(II) Fe(III), Hg(II), Cd(II) and Cr(III) are reduced to low levels by the addition of Na₂FeO₄ and its subsequent decomposition to a Fe(OH)₃ gel. The odors (presumably due to sulfur compounds) are completely removed, the bacterial action greatly reduced and the sedimentation rate significantly increased by this reagent.