نتایج جستجو برای: caustic agents
تعداد نتایج: 362247 فیلتر نتایج به سال:
In this research, photocatalytic degradation method has been introduced to clean up Spent Caustic of Olefin units of petrochemical industries (neutralized Spent Caustic by means of sulfuric acid) in the next step, adaptable method and effective parameters in the process performance have been investigated. Chemical oxygen demand (COD) was measured by the commercial zinc oxide that synthesized wi...
The caustic or Gaviola test, used for testing aspheric mirrors, has been studied with reference to the research of Schroader ["The caustic test," in Amateur Telescope Making III, A. G. Ingalls, ed. (Kingsport Press, Kingsport, Tenn., 1953), pp. 429-456]. It is shown that the two central formulas, which are used to determine the mirror quality, give significant errors for the large-diameter, sho...
Sib,?A very simple and painless way of removing an ingrowing toe-nail is by the application of lunar caustic, but as it does not appear to be generally known, I shall here describe it for the benefit of the profession. A solid piece of lunar caustic should he well applied daily over the whole of the affected nail, which, in a few days, wiil become sufficiently detached, so as to allow of its be...
Beamswhich follow curved trajectories are useful in a variety of applications, but up to now have been realized mainly in linear media. We demonstrate theoretically and experimentally the generation of second-harmonic (SH) beams which follow arbitrary convex caustic trajectories. These beams are created in a nonlinear photonic crystal with a second-order susceptibility having a tailored pattern...
Caustic esophageal injury results from accidental ingestion of corrosive in children and intentional in adults [1]. The common causes are ingestion of strong alkali and highly concentrated acids. Once a stricture is identified, esophageal dilatation is initiated and gradually advanced to relieve dysphagia. Chronic inflammation and fibrosis leads to dysplasia which predisposes the epithelium to ...
We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. E-mail: [email protected] †Membe...
Tracheoesophageal fistulas are uncommon and present diverse etiologies, among which is burning of the esophagus due to caustic ingestion. Herein, we report the case of a 27-year-old male patient having ingested a caustic substance 14 days prior and presenting burning retrosternal pain, weakness, productive cough with purulent sputum and dyspnea accompanied by hoarseness for the preceding 24 h. ...
The recently discovered ring of stars near Galactocentric distance r = 20 kpc is interpreted as baryonic matter accreted onto the second caustic ring of dark matter in our galaxy. Caustic rings of dark matter were predicted in the Galactic plane at radii an ≃ 40 kpc/n where n = 1, 2, 3... They can reveal themselves by their gravitational influence on the distribution of baryonic matter. There i...
The aim of this text is to develop on the asymptotics of some 1-D nonlinear Schrödinger equations from both the theoretical and the numerical perspectives, when a caustic is formed. We review rigorous results in the field and give some heuristics in cases where justification is still needed. The scattering operator theory is recalled. Numerical experiments are carried out on the focus point sin...
The electron capture gas liquid chromatography test method for chick edema factor has been modified by replacing the alumina column s t ep with an additional sulfuric acid cleanup and a caustic wash which permits a reduction in sample cleanup time. Samples are subjected to double preliminary sulfuric acid cleanup and caustic wash and extracted each time with t r imethyl pentane. The final extra...
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