Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Stimulants history

When chlorisondamine (>5 x 10 5M) was perfused over the locust isolated retractor unguis nerve-muscle preparation the neurally-evoked twitch contraction of the retractor unguis muscle was reduced in amplitude with 5 x lO H chlorisondamine the twitch was almost abolished. Part of this reduction in twitch amplitude was independent of the recent stimulation history of the retractor unguis muscle, unlike the remainder which was clearly dependent upon the stimulation frequency. Although it is not possible with this type of preparation to gain much insight into the site and mode of action of compounds such as chlorisondamine the results of these... [Pg.307]

Review of stimulation history is of the utmost importance and thus should not be avoided, no matter what one may be in fear of discovering. Valuable information and even correlations may he extracted however, these should not be obtained by taking documented past stimulation results too far. A number of circumstances and well conditions may be factors in poor stimulation responses but cannot be discovered or explained. [Pg.35]

In any case, stimulation history must be investigated to uncover possible damage caused, as well as for guidance in subsequent stimulation design. Unfortunately, records of past stimulation treatments are often incomplete or sketchy. They are not usually written with future stimulation needs in mind. [Pg.35]

In reviewing stimulation history, one should contact those who were involved in past treatment design or were on-site during treatment, provided that they are still available and their memories are intact. Little details that were observed may shed light on what happened in a past treatment. [Pg.35]

In 1984, McLeod introduced his acid-use guidelines for sandstone to the industry. In that landmark paper, he also introduced acid-use guidelines for carbonates. His guidelines for matrix acidizing of carbonates (with minor modification) are outlined in table 11-1. These guidelines are useful for designing basic matrix treatments, especially for new wells or for wells in fields with no previous stimulation history. [Pg.164]

Without prior stimulation history, it is not possible to definitively predict the outcome of one treatment method in a particular field. However, one should not be discouraged by this unpredictability. Successful acid fracturing is possible—and exciting when accomplished. The absence of proppant is a major plus in favor of acid fracturing. [Pg.176]

Many other parepistemes were stimulated by the new habits of precision in theory. Two important ones are the entropic theory of rubberlike elasticity in polymers, which again reached a degree of maturity in the middle of the century (Treloar 1951), and the calculation of phase diagrams (CALPHAD) on the basis of measurements of thermochemical quantities (heats of reaction, activity coefficients, etc.) here the first serious attempt, for the Ni-Cr Cu system, was done in the Netherlands by Meijering (1957). The early history of CALPHAD has recently been... [Pg.197]

A comprehensive assessment of the stimulant-dependent patients psychological, medical, forensic, and drug use history may be difficult, because information may be incomplete or unreliable. In recognition of this deficiency, it is important that the patient receives a thorough physical examination, as well... [Pg.192]

It becomes difficult at this point to follow a central thread of historical development As the insights of quantum theory continued to stimulate new approaches to all the sciences, discoveries and applications related to luminescence appeared rapidly in many diverse fields. As a result, the remaining history necessarily becomes highly selective and many interesting and important aspects of recent luminescence history have surely been omitted. [Pg.7]

Traditional CNS stimulants have the potential to increase blood pressure and heart rate when used long term. In addition, excessive CNS stimulation can cause tremors and tics and can carry over into evening hours, where initiation of normal nighttime sleep can be disrupted. Caution should be used in patients with underlying cardiovascular or cerebrovascular disease and in patients with a history of seizures because stimulants may lower the seizure threshold. [Pg.628]

Hydraulic pressure stimulation (fracturing) of oil and gas wells has now accumulated 40 years of history and experience. The actual practice and application of this technique supports a multi-billion dollar service industry which annually utilizes in excess of 130 million pounds of chemical additives. This chapter will describe the fracturing fluids that are used and some of the additives, their purpose, and the principles that make their use effective as well as necessary. Information presented will update a body of review literature that covers the prior years of fracturing(1). Chemicals are added for specific purposes which are identifiable by their descriptive title. Veatch02) has compiled a thorough general list of the additives added to fracturing fluids. [Pg.61]

Acids were an early exception to the no water rule. It was recognized that aqueous solutions of acids would inhibit swelling of clays and shales as well as dissolve any acid-soluble minerals contained in a formation. By 1933 commercial well stimulation with hydrochloric acid was of great interest. A whole separate methodology and treatment chemistry has since evolved around acidizing and fracture acidizing(54). Water emulsions, mainly emulsified acids, and gelled acids thickened with polymeric additives were applied early in the history of well treatment. [Pg.69]

Barby, G.B. and Barbee, W.C. "Ultra-High Conductivity Fracture Stimulations A Case History," SPE paper 16222, 1987 SPE Production Operations Symposium, Oklahoma City, March 8-10. [Pg.660]


See other pages where Stimulants history is mentioned: [Pg.25]    [Pg.25]    [Pg.25]    [Pg.25]    [Pg.2483]    [Pg.3034]    [Pg.42]    [Pg.551]    [Pg.47]    [Pg.475]    [Pg.391]    [Pg.272]    [Pg.216]    [Pg.306]    [Pg.1224]    [Pg.676]    [Pg.196]    [Pg.31]    [Pg.52]    [Pg.438]    [Pg.93]    [Pg.328]    [Pg.140]    [Pg.237]    [Pg.73]    [Pg.123]    [Pg.532]    [Pg.742]    [Pg.825]    [Pg.874]    [Pg.3]    [Pg.450]   
See also in sourсe #XX -- [ Pg.10 , Pg.11 ]

See also in sourсe #XX -- [ Pg.110 ]




SEARCH



Stimulation history

© 2024 chempedia.info