Bubble memory module

Design, fabrication and test of partially populated prototype recorder using 100 kilobit serial chips is described. Electrical interface, operating modes, and mechanical design of several module configurations are discussed. Fabrication and test of the module demonstrated the practicality of multiplexing resulting in lower power, weight, and volume. This effort resulted in the completion of a module consisting of a fully engineered printed circuit storage board populated with 5 of 8 possible cells and a wire wrapped electronics board. Interface of the module is 16 bits parallel at a maximum of 1.33 megabits per second data rate on either of two interface buses

Show-and-Tell: Assessing Oral Language Abilities

The oral sharing of a personal experience or an obj ect with a peer audience is often a regular part of a student\u27s school day. This sharing time is usually called stow-and-tell in the elementary grades and personal reporting or monologuing in the intermediate and upper grades

Sense circuit arrangement

A unique, two-node sense circuit is disclosed. The circuit includes a bridge comprised of resistance elements and a differential amplifier. The two-node circuit is suitably adapted to be arranged in an array comprised of a plurality of discrete bridge-amplifiers which can be selectively energized. The circuit is arranged so as to form a configuration with minimum power utilization and a reduced number of components and interconnections therebetween

Comparative testcross and per se performance of heterogeneous maize lines with their homozygous derivatives

The objectives of this study were to compare the testcrosses of S[subscript]2 lines from BS13(S2)C1 with two S[subscript]2 lines from Lancaster Composite with their S[subscript]8 x S[subscript]8 counterparts, to compare S[subscript]2 per se performance with their S[subscript]8 derivatives, to compare S[subscript]2 per se performance with their S[subscript]8 testcross performance, and to evaluate the performance of S[subscript]2 x S[subscript]2 hybrids. Twenty-seven S[subscript]2 lines and their S[subscript]8 derivatives from BS13(S2)C1 were crossed to two S[subscript]2 lines and their S[subscript]8 derivatives from Lancaster Composite. The testcrosses and inbreds, along with checks, were evaluated. The traits measured were grain yield, grain moisture, stand, root and stalk lodging, dropped ears, and ear height. Only ear height differences were significant when comparing the S[subscript]2 testcrosses with that of the S[subscript]8 testcrosses. Trait-for-trait correlations between the S[subscript]2 and S[subscript]8 testcrosses for each tester were all positive, but generally nonsignificant. Correlations for yield between the S[subscript]2 and S[subscript]8 testcrosses for each tester were 0.13 and 0.15. The correlations of traits between the two generations of BS13(S2)C1 lines per se were all positive and were significant for grain yield, root lodging, and ear height. The trait correlations between the S[subscript]2 lines and their S[subscript]8 testcrosses were nonsignificant and not large enough to be of predictive value. The mean yields for the S[subscript]2 and S[subscript]8 testcrosses were very similar. The mean grain yield for the BS13(S2)C1 S[subscript]2 and S[subscript]8 lines was significantly different, as were moisture and ear height differences. Although the trait correlations were largely positive, the S[subscript]2 x S[subscript]2 testcrosses were not satisfactory predictors of their S[subscript]8 x S[subscript]8 counterparts. The S[subscript]2 line per se performance was a good indicator of the S[subscript]8 derivative\u27s per se performance. While the trait correlations between the S[subscript]2 lines and their S[subscript]8 testcross performance were generally larger than between the two testcross generations, they were not of a predictive level. The performance of the S[subscript]2 x S[subscript]2 hybrids was very comparable to the S[subscript]8 x S[subscript]8 hybrids. Several significant rank changes occurred between the two generations of testcrosses, indicating that one or both lines underwent significant genetic changes during inbreeding

Action Book Nursery Rhymes and Favorite Tales

Action books of rhymes and tales are well suited for use with young children to help develop J:: rereading skills and foster a lively interest in books. It is the purpose of this article to present a rationale and guidelines for using action book nursery rhymes and favorite tales with preschool and kindergarten children. A booklist has been compiled to assist parents and teachers in choosing a resource collection

A miscellaneous note on the equivalence of two poisson likelihoods

This note shows that the concept of an offset, frequently introduced in Poisson regression models to cope with ratetype data, can be simply treated with a regular Poisson regression model. Hence Poisson regression models requiring an offset can be fitted with ordinary Poisson regression models. Some illustrations are provided and it is discussed how this result came about

The 10 to the 8th power bit solid state spacecraft data recorder

The results are summarized of a program to demonstrate the feasibility of Bubble Domain Memory Technology as a mass memory medium for spacecraft applications. The design, fabrication and test of a partially populated 10 to the 8th power Bit Data Recorder using 100 Kbit serial bubble memory chips is described. Design tradeoffs, design approach and performance are discussed. This effort resulted in a 10 to the 8th power bit recorder with a volume of 858.6 cu in and a weight of 47.2 pounds. The recorder is plug reconfigurable, having the capability of operating as one, two or four independent serial channel recorders or as a single sixteen bit byte parallel input recorder. Data rates up to 1.2 Mb/s in a serial mode and 2.4 Mb/s in a parallel mode may be supported. Fabrication and test of the recorder demonstrated the basic feasibility of Bubble Domain Memory technology for such applications. Test results indicate the need for improvement in memory element operating temperature range and detector performance

Image Artifacts in Concurrent Transcranial Magnetic Stimulation (TMS) and fMRI Caused by Leakage Currents: Modeling and Compensation

Purpose: To characterize and eliminate a new type of image artifact in concurrent transcranial magnetic stimulation and functional MRI (TMS-fMRI) caused by small leakage currents originating from the high-voltage capacitors in the TMS stimulator system.Materials and Methods: The artifacts in echo-planar images (EPI) caused by leakage currents were characterized and quantified in numerical simulations and phantom studies with different phantom-coil geometries. A relay-diode combination was devised and inserted in the TMS circuit that shorts the leakage current. Its effectiveness for artifact reduction was assessed in a phantom scan resembling a realistic TMS-fMRI experiment.Results: The leakage-current-induced signal changes exhibited a multipolar spatial pattern and the maxima exceeded 1% at realistic coil-cortex distances. The relay-diode combination effectively reduced the artifact to a negligible level.Conclusion: The leakage-current artifacts potentially obscure effects of interest or lead to false-positives. Since the artifact depends on the experimental setup and design (eg. amplitude of the leakage current, coil orientation, paradigm. EPI parameters), we recommend its assessment for each experiment. The relay-diode combination can eliminate the artifacts if necessary