Flush Times Research Articles

It's Flushing Time Again

This article suggests a flushing program for the fall, and explains what crews should expect from two slugs of water—the “dead” water in the hydrant lead and the dirty water created by unusual velocities in the main.

ENVIRONMENTAL CONTROL OF PITHOPHORA OEDOGONIA (CHLOROPHYCEAE) AKINETE GERMINATION1

ABSTRACTAbundance of Pithophora oedogonia akinetes displayed seasonal changes, being greatest in winter and lowest in summer. Akinete abundance showed significant (P < 0.001) negative correlations with photoperiod(r = ‐0.53) and water temperature (r= ‐0.75) during the period February 1978 through June 1979. Experiments in which akinete germination was studied in response to manipulations of nutrients (NO3‐N and PO4‐P), photoperiod and temperature indicated that temperature was the primary factor regulating the timing of the vernal flush of akinete germination observed in Surrey Lake.

Comparative roles of soil and air temperatures in the timing of spring bud flush in seedling Douglas-fir

Outdoor cold frame tests in which air and soil temperatures were modified showed both to be involved in the timing of spring bud flush. The results indicated that warming the soil advanced the date of growth initiation and warming the air increased the rate of bud development once initiated. The latter had a 5.7:0.45 greater effect per degree celsius change in temperature.

Scheduling Trees in Parallel/Pipelined Processing Environments

Scheduling task trees to be executed in parallel and/or pipelined processing systems are examined under individual situations. Processor structural requirements at task nodes are also included in the model of consideration. While simple techniques can serve as heuristics, counterexamples are constructed in some crucial cases. Simple optimal algorithms are presented in two important cases: 1) unistructure, multipipe, uniform latency, and flush time; and 2) vector loops. Finally, the complexity of the remaining cases is scrutinized with different structural parameter combinations.

Development of Ilex crenata Thunb. ‘Hetzi’ as Influenced by Time and Concentration of EHPP1

Abstract Ethyl hydrogen 1-propylphosphonate (EHPP) foliar sprays increased branching and reduced height of Ilex crenata Thunb. ‘Hetzi’ but not plant dry weight Phytotoxicity was extensive above 8,000 ppm EHPP, but acceptable at lower concentrations. Plant quality as determined by branching and phytotoxicity was optimal at 6,000 ppm EHPP. Time of application had no effect on height or dry weight, but when applied near the time of a terminal growth flush, EHPP increased branching. Phyto toxicity was severe if EHPP application was delayed several weeks after the growth flush had begun.

Effect of radiographic contrast media in selective injections into the sinus node artery. An experimental study in dogs.

The toxic manifestations of modern intravascular contrast agents have been extensively studied in many parts of the body (1–4). In most areas their predominant toxic effect seems related to their hypertonicity (1, 5, 6). The purpose of this paper is to report the toxic effects of the modern intravascular contrast agents on the sinus node of the canine heart. Methods And Materials An experimental model was designed for this study by modifying one used by Dr. Thomas James for the study of pharmacologic agents (7). The heart was exposed through an anterior bilateral thoracotomy in the fourth intercostal space while the respiration was supported with an intratracheal tube and a respirator. The pericardium was opened over the right coronary atrioventricular groove, and the sinus node artery was identified arising from the right coronary ar-tery, coursing dorsally and then cephalad to perforate the sinus node tissue. The sinus node artery was then ligated just distal to its origin, and a small cannula (I.D. 0.015) was tied in place beyond the ligature (Fig. 1). The injections were made by means of a pair of Harvard infusion pumps connected through a three-way stopcock to the cannula in the sinus node artery. One of the pumps was used for a timed infusion at a known rate of the substance to be tested. The other was used for a timed flushing of the tested substance with normal saline or Ringer's solution. The following data were recorded on a polygraph: one lead of the electrocardio-gram; cardiac rate; aortic pressure; and time of injection or flush. This provided a model for selective perfusion of the sinus node tissue with contrast agents. The right coronary artery remained intact, and the electrocardiogram was not altered by this preparation of the sinus node artery. Between injections into the sinus node artery the collaterals from the atrial branches and from the circumflex branch of the left coronary artery supplied blood to the perfused area as indicated by back bleeding into the cannula. Studies were performed in 45 dogs. Injections of the test substances were made in ordered and randomized series in varying concentrations. Intermittently, saline was used in fixed concentrations as a control to validate the continued usefulness of the particular animal. The return of the animal's circulation to a stable rate was used as a criterion for beginning the next injection. At least two minutes were also allowed between injections. Subsequently, the experiment was extended by atropinizing the animals (1 mg/kg) and/or cutting the vagus nerves after the typical response had been obtained with a test substance injection. These animals were then reinjected with the same test substance. Results 1. Type of Infusions Eliciting a Response: Two types of responses were observed, one to variations in speed of injection, the other to variations in the composition of the injectate.

The Flush Times of California

The Flush Times of California

Black Cargoes: A History of the Atlantic Slave Trade, 1518-1865.

The beginnings slaving in the 17th century the early American trade flush times on the Guinea Coast the middle passage captains and crews the Yankee slavers the fight to abolish the trade contraband the roaring 1840s slave catching in the Indian Ocean the dream of a slave empire.

The Control of Tea Flushing with Maleic Hydrazide

MH solutions of 0.05 to 0-25% containing wetting agent were sprayed at the rate of 1800 liters per ha to the tea plant, about 30 days before flushing.The concentration of the leaf juice was raised with increasing the concentration of MH solutions. The tea flushing time was delayed proportionally to the concentration of MH solutions, with the following regressive relation ofY=3.5+110xThe more, the concentration of MH solution the less the injury of the tea plant, owing to the delaying of the flush time. So the interval of the plucking date of each plot came close.In the plots treated with MH, though the frost injury was reduced, the yield decreased owing to MH agency. Therefore, the differences of yield between each plot were not significant, cancelling these two effects with each ohter. MH is effective to reduce the frost injury of the tea plant but its practical value is doubtful.