General Electric

About: General Electric is a company organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Turbine & Rotor (electric). The organization has 76365 authors who have published 110557 publications receiving 1885108 citations. The organization is also known as: General Electric Company & GE.

MRI-guided noninvasive ultrasound surgery.

Abstract: In this study, the feasibility of using magnetic resonance imaging(MRI) to detect tissue necrosis induced by focussed ultrasound beams was investigated. It was shown that lesions produced in dog’s thigh musclein vivo were clearly visible in T2‐weighted images and that the lesion dimensions measured from the images correlated with the postmortem measurements of the visible tissue damage. It was also shown that the sonications can be done in the magnet and that the lesions are visible immediately after the sonications with increasing imagecontrast as a function of time. These results showed that MRI can be used to direct and monitor on‐line noninvasive ultrasound surgery. This may have a major impact in future patient treatments.

Preparation of Diamond

Abstract: It would be good to be able to write a paper entitled \"The Preparation of Diamond\", in which all the factors affecting diamonds were nicely accounted for and the formation of diamond was completely explained. But the work which has been carried out on this problem indicates that diamond can form in several different ways, and that stubborn mysteries still surround some of them. This article, therefore, is more of the

Cationic polymerization — Iodonium and sulfonium salt photoinitiators

Abstract: Diaryliodonium, triarylsulfonium, dialkylphenacylsulfonium and dialkyl-4-hydroxyphenylsulfonium salts are versatile new classes of photoinitiators of cationic polymerization which have been reported in the last few years. These photoinitiators fall into two basic types based on the mechanisms of their photolysis. The first class comprises diaryliodonium and triarylsulfonium salts which undergo photoinduced fragmentations to generate aryl radicals and either aryliodinium or diarylsulfinium cation-radicals. On the other hand, dialkylphenacylsulfonium and dialkyl-4-hydroxyphenylsulfonium salts generate ylides and Bronsted acids by a reversible photolysis. Both classes of onium salts can be photosensitized to respond to long wavelength UV and visible light. Photosensitization occurs chiefly by an electron transfer process. Photogenerated free radicals can also be employed to induce the decomposition of diaryliodonium and certain triarylsulfonium salts by a chain reaction. Modifications within the cations and anions of the above onium salts have a marked influence on the course of the cationic polymerizations which are initiated using these photoinitiators. The structure of the cations exerts a dominant role in the photochemistry and determines the rate at which initiator fragments are produced. The reactivity and propensity of the initiator fragments to undergo termination are controlled by the nature of the anion. Photoinitiated cationic polymerizations using iodonium and sulfonium salts are currently finding use in a number of commercial applications including coatings, adhesives, inks and novel photoresists.