The torque and thrust force in twist drilling—II. Comparison of experimental observations with deductions from theory

Published data are shown to conform with previously derived expressions relating the torque and the thrust to feed and drill diameter in drilling operations conducted with a set of geometrically similar twist drills. The model from which the theoretical expressions are derived is shown to be capable of explaining the apparently deviant behaviour observed when drilling workpieces which exhibit high adhesion. The model is based on the assumption that the removal process at the drill lips is quasi-orthogonal which is valid provided the drill diameter is sufficiently large compared to the chisel edge length. The behaviour observed with small diameter drills is shown to be consistent with the removal process becoming noticeably oblique. The consequences of geometric dissimilarity of drill shape are discussed.     

Review of utility home energy audit programs

Evaluation efforts of utilities with active home energy audit programs were reviewed to provide insights into the operations and effectiveness of existing utility home energy audit programs. About half the utilities contacted had little or no evaluation activity. Of those with evaluation activity, most conducted only informal evaluations for in-house use. A few utilities had conducted fully documented formal evaluations. On the basis mainly of written reports received from the utilities, findings about customer response to programs are summarized. The topics discussed include: determinants of program participation rates, use of financing, attitudes toward programs, actions taken, characteristics of participants and energy savings due to programs.     

Impaired Sustained Attention and Error-Induced Stereotypy in the Aged Ts65Dn Mouse: A Mouse Model of Down Syndrome and Alzheimer's Disease.

This study compared performance of 15- to 17-month-old Ts65Dn mice to that of littermate controls on an automated sustained attention task in which the location, onset time, and duration of brief visual cues varied unpredictably. Ts65Dn mice committed more omission errors than controls, particularly on trials with the briefest cues. Videotape data revealed that the trisomic mice attended less than controls during the period before cue presentation and engaged in stereotypic jumping and grooming immediately after making an error. These findings reveal that Ts65Dn mice are impaired in sustaining attention and exhibit heightened reactivity to committing an error, and support the validity of this mouse model for studying Down syndrome and Alzheimer's disease. The attention task, coupled with the videotape analyses of task performance, provides a useful paradigm for studying attention and reactivity to errors in mice. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Is a "refinement' of attribution theory necessary to accommodate the learned helplessness reformulation? A critique of the reformulation of Abramson, Seligman, and Teasdale.

In their reformulation of the learned helplessness model, L. Y. Abramson et al (1978) added a global–specific dimension to those of internal–external and stable–unstable and used all 3 dimensions to construct a 3-way classification for types of helplessness. It appears, however, that the 3 attributional dimensions can be derived directly from H. H. Kelley's (1967) original criteria of consensus, consistency, and distinctiveness. Thus it is suggested that Kelley's model can adequately account for the reformulated helplessness model of Abramson et al. (3 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Determinants of young children's search strategies in a large-scale environment.

26 3–6 yr olds searched for an object after traveling a route along which the object was used and later discovered missing (critical events). Ss then recalled the order of locations along the traveled route (sequence recall) and the locations for critical events (event recall); they also drew a map of the search environment. The correlation between event recall and search scores was significant only for Ss with good sequence recall. Correlations between sequence recall and search scores were higher for Ss who placed locations on the route in drawing maps. It is concluded that the acquisition of route knowledge in the development of spatial representation determined the likelihood that inferences would be made. When inferences were made, the accuracy of memories for sequences and events further determined the accuracy of the inferred critical search area. (8 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Practical stability test for finite elements with reduced integration

An easy to use stability test is presented for finite elements which are under- or selectively-integrated. This test is reminiscent of the patch test in that it must be applied only to one prototype element, and it is a sufficient test for the nonsingularity of the global coefficient matrix. The minimum number of integration points which can be used with each of several common one-, two- and three-dimensional elements for a variety of steady-state and time-dependent, scalar boundary value problems are given.     

NaCl thresholds in man: Thresholds for water taste or NaCl taste?

Notes that water is not tasteless to humans, but rather can produce any of the 4 basic taste qualities if it is preceded by adaptation to an appropriate substance. After adaptation to the NaCl in saliva, water tastes predominantly bitter. Results of detection threshold experiments with 9 male undergraduates and the author as Ss demonstrate that this bitter water taste can be confused with solute tastes so that some detection thresholds for NaCl may actually represent water thresholds instead. Water also appears to have a taste after adaptation to saliva in the rat. Just as with humans, some apparently low thresholds for NaCl detection in rat may be water-taste thresholds. The apparently high preference threshold for NaCl in rat may be a true NaCl threshold based on adaptation to saliva. (116 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dynamic Measurements of In-Place Steel Floors to Assess Vibration Performance

The research presented in this paper resolves several measurement issues pertaining to the experimental modal analysis of lightweight steel floor systems. This investigation represents a first step toward collecting more extensive data on the dynamic behavior of steel floor systems. These data can then be used to improve design and analysis procedures for assessing the vibration serviceability of a floor system before construction. Some of the issues investigated herein are the selection considerations for the data acquisition system and transducers, the appropriate type and placement of excitation, and fast Fourier transform processing considerations.