Punctured Poetry

In the February 1975 Kickshaws, Dave Silverman introduced Word Ways readers to Richard Armour\u27s Punctured Poems (Prentice-Hall, 1966), a literary tour de force in which implausible second lines are appended to famous first lines. Actually,t his concept has been around awhile, and has been independently discovered by many people

Malaproverbs

Take a familiar proverb (a rolling stone gathers no moss), remove a phrase (rolling stone), insert an equally-familiar one (rolling pin), and what do you have? A malaproverb, that\u27s what. Here\u27s more

Electrostatic Active Radiation Shielding -- Revisited

For the success of NASA\u27s new vision for space exploration to Moon, Mars and beyond, exposures from the hazards of severe space radiation in deep space long duration missions is \u27\u27a must solve\u27\u27 problem The payload penalty demands a very stringent requirement on the design of the spacecrafts for human deep space missions. Langley has developed state-of-the-art radiation protection and shielding technology for space missions. The exploration beyond low Earth orbit (LEO) to enable routine access to space require protection from the hazards of the accumulated exposures of space radiation, galactic cosmic rays (GCR) and solar particle events (SPE), and minimizing the production of secondary radiation is a great advantage. There is a need to look to new horizons for newer technologies. The present investigation revisits electrostatic active radiation shielding and explores the feasibility of using the electrostatic shielding in concert with the innovative materials shielding and protection technologies. The full space radiation environment has been used for the investigation. The goal is to repel enough positive charge ions so that they miss the spacecraft without attracting thermal electrons. Conclusions are drawn, should the electrostatic shielding be successful, for the future directions of space radiation protection

Physiologic Specialization of \u3ci\u3ePuccinia recondita\u3c/i\u3e f. sp. \u3ci\u3etritici\u3c/i\u3e in Nebraska During 1995 and 1996

Field samples of Puccinia recondita f. sp. tritici, collected from four wheat-growing regions in Nebraska in 1995 and from three in 1996, were characterized for virulence. Twenty virulence phenotypes were identified in 1995 and 18 in 1996. Virulence phenotypes MBR-10,18 (virulent on Lr genes, 1, 3, 3ka, 10, 11, 18, and 30) and MDR-10,18 (virulent on Lr genes 1, 3, 3ka, 10, 11, 18, 24, and 30) were the most prevalent, with each phenotype comprising 21.6% of the isolates characterized in 1995. Of the 1995 isolates, 24% were virulent on 10 or more host genes. No virulence to Lr16 and Lr17 was detected. In 1996, virulence phenotype MBR-10,18 was the most prevalent and comprised 20.5% of the isolates characterized. Of the 1996 isolates, 33% were virulent on 10 or more host genes. All isolates in both years were virulent on Lr1, Lr3, and Lr10. New virulence phenotypes were detected in 1996 that were not detected in 1995. In 1996, virulence was more frequent on Lr2a, Lr16, and Lr17 and less frequent on Lr3ka, Lr18, Lr24, Lr26, and Lr30. The number of isolates virulent on Lr24 and Lr26 has decreased from 83 and 53%, respectively, in 1992, to 34 and 1%, respectively, in 1996

Supplement to stresses induced in a sandwich panel by load applied at an insert

Information reviewed and reaffirmed in 1960

Characterizing the Performance of Liquid Oxygen in a Magnetic Fluid Management System

The strong paramagnetic susceptibility of liquid oxygen (LOX) has established it as a good candidate for a cryogenic magnetic fluid system. While these properties have been defined for several decades, the continuing advancement and requirements of space technology will soon find a suitable application for a magnetic fluid system which can operate reliably and efficiently. Testing has begun on the dynamics of LOX when applied to electrically-induced steady and varying magnetic fields within a solenoid. The performance of LOX as a working fluid was characterized by its operability and sustainable pressure before breakdown. This paper presents numerical and experimental data on the performance characteristics of LOX in a magnetic fluid management system

Scanning tunneling microscopy of DNA: Atom-resolved imaging, general observations and possible contrast mechanism

We have shown that it is possible to image DNA with atomic resolution using scanning tunneling microscopy (STM), [R. J. Driscoll, M. G. Youngquist, and J. D. Baldeschwieler, Nature 346, 294 (1990)]. Here we describe that data together with our general observations on STM of DNA in ultrahigh vacuum. We also suggest a possible contrast mechanism for DNA imaging by STM based on wave function orthogonality requirements between a molecule and its substrate. Topographic images are presented which resolve atomic features in addition to the double helical structure and nucleotide pairs of the DNA molecule. Comparisons of experimental STM profiles and modeled contours of the van der Waals surface of A-DNA show excellent correlation. Successive scans show that the imaging is nondestructive and reproducible. For this study, double-stranded DNA was deposited on highly oriented pyrolitic graphite without coating, shadowing, or chemical modification