Centrifugal Compressors play an essential role in oil, gas and petrochemical industries. Their extensive usage is due to their smooth operation and high reliability compared to other other compressor types. One of the main characteristics of these turbomachines is their performance curve, which is an important criterion for selecting the appropriate compressor for a desired working condition. I...

Elevated concentrations of homocysteine (Hcy) are associated with a range of disorders. Linearity, imprecision, interference, method comparison, and accuracy were evaluated on the ADVIA Centaur (Siemens Healthcare Diagnostics, Deerfield, IL), ARCHITECT i2000SR (Abbott Diagnostics, Abbott Park, IL), AxSYM (Abbott Diagnostics), and IMMULITE 2000 (Siemens Healthcare Diagnostics) methods and analyz...

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A new fiber optic microsensor has been developed for pressure measurement. The pressure microsensor is extremely small (360 micro m). Performance characteristics of the microsensor were evaluated over a pressure range from 0 to 250mmHg. Five sensors were compared to a National Institute of Standards and Technology traceable reference pressure. The microsensor had an accuracy, repeatability, and...

A wide variety of heavy vehicle types—including single-unit trucks, combination trucks with one, two, or three trailers, and buses—operate on U.S. highways. These heavy vehicle types each have unique physical and performance characteristics that interact with highway features. This chapter summarizes the physical and performance characteristics of heavy vehicles. The issues addressed in this ch...

1 From the Departments of Radiology (J.Y., R.K.H., A.M.S.G., S.D.W.) and Gastroenterology (G.A.A., K.R.M.), Veterans Affairs Medical Center, 4150 Clement St, San Francisco, CA 94121; and the Departments of Radiology (J.Y., R.K.H., A.M.S.G., S.D.W.) and Gastroenterology (G.A.A., K.R.M.), University of California School of Medicine, San Francisco. From the 1999 RSNA scientific assembly. Received ...

Computing clusters built from standard components using Intel® processors are becoming the fastest growing choice for high-performance computing (HPC). Twice yearly, the 500 most powerful computing systems in the world are ranked on the TOP500 Supercomputer Sites Web page. In November 2002, the ranking listed 56 entries using Intel processors; by June 2003, that number reached 119. Today, three...

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Global Navigation Satellite Systems (GNSS) provide various types of positioning state solutions, such as single point positioning (SPP), precise point positioning (PPP), differential GPS (DGPS) and real time kinematic (RTK) solutions. These solutions are obtained involving different data types, receivers, samples, serving different classes of users. Previous studies on performance characteristi...

The purpose of the study is to examine how e-mail affects work performance. E-mail communication studies have aroused both praise and query regarding the suitability, appropriateness and effectiveness of electronic messages in information management. Less is known about the effects of e-mail on work performance. We consider (1) which e-mail features affect work performance; (2) whether these fe...