Rensselaer Polytechnic Institute

About: Rensselaer Polytechnic Institute is a education organization based out in Troy, New York, United States. It is known for research contribution in the topics: Terahertz radiation & Finite element method. The organization has 19024 authors who have published 39922 publications receiving 1414699 citations. The organization is also known as: RPI & Rensselaer Institute.

The discovery and development of onium salt cationic photoinitiators

Abstract: The story of the discovery and development of onium salt photoinitiators for cationic polymerization is chronicled. The chemistry of the synthesis of these compounds is outlined, and the mechanisms of their initiation are discussed briefly. Among the most useful of these types of photoinitiators are diaryliodonium and triarylsulfonium salts, which are used widely for photoinduced cationic crosslinking reactions. From the very beginning, onium salt photoinitiated cationic polymerizations have found use in a multitude of practical applications. Specifically discussed in this article are the use of onium salts in coatings, adhesives, printing inks, release coatings, stereolithography, holographic recording, photocurable composites, and microelectronic photoresists. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 4241–4254, 1999

The anatomy of a power grid blackout - Root causes and dynamics of recent major blackouts

Abstract: This paper examines some of the more recent major blackouts and discusses some of the root causes and dynamics of these events. The paper aims to identify high-level conclusions and recommendations for improving system dynamic performance and reducing the risk of such catastrophic events

Internet Use Among College Students: An Exploratory Study

Abstract: The author and associates surveyed 1,300 college students in classrooms at eight academic institutions to identify how the students' use of the Internet has affected their social or academic lives. Although the typical Internet-using student uses the Internet for 100 minutes per day, a small group of students use the Internet to a degree that interferes with other aspects of their lives. Most of them are men and are found among the hard science academic majors. Some ideas for dealing with this problem are suggested.

Parameterized object sensitivity for points-to analysis for Java

Abstract: The goal of points-to analysis for Java is to determine the set of objects pointed to by a reference variable or a reference object field. We present object sensitivity, a new form of context sensitivity for flow-insensitive points-to analysis for Java. The key idea of our approach is to analyze a method separately for each of the object names that represent run-time objects on which this method may be invoked. To ensure flexibility and practicality, we propose a parameterization framework that allows analysis designers to control the tradeoffs between cost and precision in the object-sensitive analysis.Side-effect analysis determines the memory locations that may be modified by the execution of a program statement. Def-use analysis identifies pairs of statements that set the value of a memory location and subsequently use that value. The information computed by such analyses has a wide variety of uses in compilers and software tools. This work proposes new versions of these analyses that are based on object-sensitive points-to analysis.We have implemented two instantiations of our parameterized object-sensitive points-to analysis. On a set of 23 Java programs, our experiments show that these analyses have comparable cost to a context-insensitive points-to analysis for Java which is based on Andersen's analysis for C. Our results also show that object sensitivity significantly improves the precision of side-effect analysis and call graph construction, compared to (1) context-insensitive analysis, and (2) context-sensitive points-to analysis that models context using the invoking call site. These experiments demonstrate that object-sensitive analyses can achieve substantial precision improvement, while at the same time remaining efficient and practical.

An inventory of interstellar ices toward the embedded protostar W33A

Abstract: This paper presents, for the —rst time, a complete 2.4¨25 km spectrum of the dust-embedded young stellar object W33A. The spectrum was obtained with the Short Wavelength Spectrometer of the Infrared Space Observatory at a mean resolving power of D750. The spectrum displays deep ice and silicate H 2 O absorptions centered at 3.0 and 9.7 km, respectively, together with absorption features identi—ed with various other molecules in the solid phase. The 2.4¨5.0 km region of the spectrum is used to investigate the long-standing problem of the ice column density toward W33A, by means of the stretching and H 2 O combination mode features at 3.0 and 4.5 km. Although no —ux is seen at the center of the 3.0 km feature, its central depth may be constrained by —tting assumed pro—les to the short- and long- wavelength wings in our spectrum. We deduce that a value of cm~2 is con- N(H 2 O) \ (1.1 ^ 0.3) ) 1019 sistent with these features, a factor of at least 3 less than predicted by the bending mode at 6.0 km; H 2 O the reason for this discrepancy is unclear. We report new results on the abundances of nitrogen-bearing species in the ices toward W33A. Solid is detected for the —rst time in this line of sight, by means NH 3 of the inversion-mode feature at 9.0 km. The column density is cm~2, N(NH 3 ) \ (1.7 ^ 0.4) ) 1018 implying an abundance of D15% relative to comparable to that recently reported toward the H 2 O, young star NGC 7538 IRS 9. However, we —nd no convincing evidence for absorptions associated with the C"N stretching mode of nitriles in the 4.4¨4.6 km region of the spectrum. If nitriles are present in the ices along this line of sight, they must have column density no more than D1017 cm~2 or D1% relative to This argues against identi—cation of the deep 4.62 km iXCNfeature with isonitriles, as