An evaluation of the quantum efficiency of optical heterodyne detectors

Measurements are presented which verify the previous theoretical analysis of photomixers. A review of the theory is presented and theoretical predictions of the performance of a device are made. The measurements on the device are discussed and compared to the theory.     

Comment on "Exceptions to Hick's law: Explorations with a response duration measure" (Longstreth, El-Zahhar, & Alcorn, 1985).

Longstreth, El-Zahhar, and Alcorn's (1985) rejection of Hick's law is critically examined and alternative explanations of the available data are considered. An elaboration of Hick's law to include task-dependent search strategies seems able to account for a broader range of data than the Longstreth et al. model. Further study the determinants of such stategies would be useful. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Visualization of the entire surface of a protein by cartographic projection

A minicomputer based system for the determination and schematic representation of protein surfaces is described. The algorithms are based on the atomic coordinates of globular protein molecules of the Brookhaven Protein Data Bank. Using a cartographic projection a normalized graphic representation is obtained of the amino acid residues located on the surface of the considered protein. The programs are written in FORTRAN IV (surface determination) and BASIC (graphic representation).     

The effect of the textile industry dye bath additive EDTMPA on colour removal characteristics by ozone oxidation.

In this study, the effects of the phosphonic acid based sequestering agent EDTMPA used in the textile dye baths on colour and organic matter removal by ozone oxidation was experimentally investigated. Procion Navy HEXL dyestuff that has been commonly used for the reactive dyeing of cellulose fibers was selected as the model component. The organic matter oxidation by ozone was determined to obey the pseudo-first order kinetics as they are treated singly or in combination. COD removal rates obtained from pseudo-first order reaction kinetics showed that oxidation of Navy HEXL alone (0.0947 L/min) was faster than that of EDTMPA (0.0171 L/min) and EDTMPA with dye (0.0155 L/min) at pH 3.0. It was also found that reaction rates of single EDTMPA removal and EDTMPA and dye mixture removal increased as the reaction pH was increased from 3.0 to 10.5.     

Microprocessor testability

As the level of microprocessor complexity increases to several hundred thousand transistors for a single-chip machine, it is becoming very difficult to test commercially available designs to the level of fault coverage desired by some customers. In order to achieve near 100-percent coverage of single stuck-at faults, future microprocessors must be designed with special testing features (designed for testability). The authors describe the testing problem for microprocessors, including the various methods of generating test sets and their application by the user. A survey of the testability features of some of today's commercially available microprocessors is presented. Suggestions for testability features for future-generation microprocessors are also discussed     

StoryGrid [educational computing]

The StoryGrid project undertook studying the role new interface technologies might play in education, particularly at the high school level. Unfortunately, technology often seizes center stage in high school classrooms; i.e., it becomes the topic of instruction. We believe that learning about technology would be most successful when technology is not the topic, but simply a tool used during instruction. StoryGrid, therefore, was designed to support and to enhance existing narrative activity in classrooms by adhering to the following goals: trigger reflection and interpretation, accommodate individual expression and encourage student discourse.     

Some modifications of the classification tree construction algorithm

The paper describes a few modifications of the classification tree construction algorithm that have proved to be useful for solving tasks of noise spectra processing with reference to NPP diagnostics. The article was translated by the authors.