نتایج جستجو برای: caustic agents

تعداد نتایج: 362247  

Journal: :The Journal of the Acoustical Society of America 2010
Litian Wang

A set of critical conditions for the characteristic caustic points in the phonon focusing patterns in tetragonal crystals is formulated. A caustic line segment in the focusing pattern is generally associated with either a fold or a cusp on the wave surface. Most of the caustic lines are symmetrical with respect to the principal symmetry plane and can be characterized by the caustic points at th...

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Journal: :Journal of the American Academy of Dermatology 2005
Nathaniel Jellinek Mary E Maloney

A growing era of alternative medicine is upon us. All who practice medicine have a small population of patients who eschew Western medicine and prefer alternative approaches, including botanical remedies, to treat their medical problems. Many alternative practitioners advertise and sell products on the Internet. Indeed, this trend now includes a growing number of topical treatments for skin can...

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2012

Contamination types, levels and their behavior within drilling wastes is determined by the local geological conditions and drilling mud design; notably lubrication fluids, weighting agents and anti-foaming agents. Such additives can contain potentially toxic elements such as aluminum and barium. Besides being contaminated, drilling wastes often have a high pH due to the addition of lime, causti...

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2016
Anna Lepore Davide D’Antini Pasquale Raimondo Lucia Mirabella Leonardo Pennisi Giuseppe Carrillo Antonella Cotoia Michele Dambrosio Gilda Cinnella

Caustic ingestion is a common cause of life-threatening upper gastrointestinal tract injuries. It mostly happens in children as accidental exposure, but may occur in adults as a result of suicide attempt. We present a case of an acute abdomen that occurred after a peculiar way of self-administration of sulfuric acid as a suicide attempt in an adult psychiatric male patient, already known for se...

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2014
K Krishna Mohana Reddy B Shiva Shankar K Amarendher Reddy S Nagalakshmi Reddy Jaradoddi Sudhakar P Sunil Kumar Reddy

Restorative dentistry involves use of various intracoronal and intracanal medicaments. Commonly used endodontic medicaments include paraformaldehyde, sodium hypochlorite and hydrogen peroxide. These agents are caustic and in higher and in inappropriate concentrations can cause immediate damage to the surrounding hard and/or soft tissues. Proper knowledge of such agents and careful use of such i...

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Journal: Environmental Health Engineering and Management 2018
Asadollah Karimi, Esmaeil Fatehifar, Hadi Soltani, Reza Alizadeh,

Background: Spent caustic contains noxious components such as sulfide species and also high chemical oxygen demand content (COD). Oxidation of these materials to caustic and sulfate species is mostly the rate-controlling step within catalytic oxidation of spent caustic. Methods: In this study, the kinetics of catalytic oxidation of spent caustic and the regeneration methodology of the sulfidic...

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2016
Toby Rogers Srijoy Mahapatra Steven Kim Michael Eckhaus William Schenke Jonathan R Mazal Adrienne E Campbell-Washburn Merdim Sonmez Anthony Z Faranesh Kanishka Ratnayaka Robert J Lederman

Background In patients with ischemic cardiomyopathy, radiofrequency ablation for ventricular arrhythmias can have limited efficacy because of the mismatch between lesion depth and substrate thickness, and because radiofrequency-induced edema surrounding the lesion is reversible resulting in only temporary conduction block. We hypothesized that transcatheter needle injection under real-time magn...

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Journal: :Applied optics 2003
James A Lock Charles L Adler Diana Ekelman Jonathan Mulholland Brian Keating

We analyze the optical caustic produced by light refracted at the curved meniscus surrounding a cylindrical rod standing partially out of a liquid-filled container. When the rod is tilted from the vertical or when light is diagonally incident, the caustic is a four-cusped astroid with two of its cusps obscured by the rod's shadow. If a portion of the flat end of the rod is raised above the wate...

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2015
Luigi Bonavina Mircea Chirica Ognjan Skrobic Yoram Kluger Nelson A. Andreollo Sandro Contini Aleksander Simic Luca Ansaloni Fausto Catena Gustavo P. Fraga Carlo Locatelli Osvaldo Chiara Jeffry Kashuk Federico Coccolini Yuri Macchitella Massimiliano Mutignani Cesare Cutrone Marco Dei Poli Tino Valetti Emanuele Asti Michael Kelly Predrag Pesko

INTRODUCTION Lesions of the upper digestive tract due to ingestion of caustic agents still represent a major medical and surgical emergency worldwide. The work-up of these patients is poorly defined and no clear therapeutic guidelines are available. PURPOSE OF THE STUDY The aim of this study was to provide an evidence-based international consensus on primary and secondary prevention, diagnosi...

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2008
SUN-JU CHUNG YONG HEE KANG

To maximize the number of planet detections, current microlensing follow-up observations are focusing on high-magnification events which have a higher chance of being perturbed by central caustics. In this paper, we investigate the properties of central caustics and the perturbations induced by them. We derive analytic expressions of the location, size, and shape of the central caustic as a fun...

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