On the Pressure Broadening in the Gamma Bands of Nitric Oxide

A quantitative investigation of the pressure broadening in the γ(0,0) and γ(1,0) bands of nitric acid established that the pressure effect is not abnormal as has sometimes been supposed and that the collision diameter of the excited NO molecule is approximately 3.8 Å

Dynamics of Excitation and Inhibition in the Light-Adapted Limulus Eye in situ

The dynamics of spike discharge in eccentric cell axons from the in situ lateral eye of Limulus, under small sinusoidal modulation of light to which the eye is adapted, are described over two decades of light intensity and nearly three decades of frequency. Steady-state lateral inhibition coefficients, derived from the very low-frequency response, average 0.04 at three interommatidial spacings. The gain vs. frequency of a singly illuminated ommatidium is described closely from 0.004 to 0.4 cps by the linear transfer function s0.25; this function also accounts approximately for the measured phase leads, the small signal adaptation following small step inputs, and for Pinter's (1966) earlier low-frequency generator potential data. We suggest that such dynamics could arise from a summation in the generator potential of distributed intensity-dependent relaxation processes along the dendrite and rhabdome. Analysis of the dynamic responses of an eccentric cell with and without simultaneously modulated illumination of particular neighbors indicates an effect equivalent to self-inhibition acting via a first-order low-pass filter with time constant 0.42 sec, and steady-state gain near 4.0. The corresponding filters for lateral inhibition required time constants from 0.35 to 1 sec and effective finite delay of 50–90 msec

Selected tether applications in space: Phase 2. Executive summary

The application of tether technology has the potential to increase the overall performance efficiency and capability of the integrated space operations and transportation systems through the decade of the 90s. The primary concepts for which significant economic benefits were identified are dependent on the space station as a storage device for angular momentum and as an operating base for the tether system. Concepts examined include: (1) tether deorbit of shuttle from space station; (2) tethered orbit insertion of a spacecraft from shuttle; (3) tethered platform deployed from space station; (4) tether-effected rendezvous of an OMV with a returning OTV; (5) electrodynamic tether as an auxiliary power source for space station; and (6) tether assisted launch of an OTV mission from space station

A Comparison of Correction Formats: The Effectiveness and Effects of Rating Scale versus Contextual Corrections on Misinformation

What style of journalistic factchecking is most convincing to readers? This study uses an online survey experiment to compare two prevailing approaches to correcting both consumer and political misinformation: factchecks that rely only on written analysis to assess claims, and those that also deploy a graphical meter or "truth scale." Testing a series of simulated factchecks from a fictitious factchecking organization, GetTheFacts.org, we find first of all that both approaches were effective on the whole, with respondents who saw either format significantly more likely than a control group to correctly evaluate a claim that had been previously debunked. Does using a truth meter make a difference? In the case of a misleading advertising claim unrelated to politics, adding a meter to the written analysis appeared to make the correction more convincing. However, both formats proved equally effective in challenging political misinformation. Both formats also yielded their largest improvements among readers who selfidentified from the same party as the politician being checked. Although respondents scored best in identifying misinformation from a politician of the opposing party, seeing a correction made no significant difference in that case. Among other results, we also find that when given the choice, just over half of respondents preferred to see corrections that included a truth scale

The Effect of Expertise on the Quality of Appraisal Services

This article examines the quality of appraisals as a function of expertise. In paraticular, we compare novices (beginning real estate students) to experts (practicing certified and/or designated appraisers) on three performance criteria. First, we examine differences in the values that these two groups attach to various property features. Second, we investigate the variation between their final market value estimates. The last task studied is whether appraisers can reliably provide a range about their market value that includes the actual sale price of the property. The results are based on a controlled experiment involving seventy-two novices and sixty-nine experts, where each participant was asked to determine a fair market value of a single-family home. Findings indicate that experienced appraisers do in fact exhibit less variation in their valuation of property characteristics, hence there is greater agreement in their market value estimates than is the case with novices. However, more experienced decision-makers tend to be overconfident of their ability: they are less likely to specify a range that includes the sale price than are novices.

Metal and molecule cooling in simulations of structure formation

Cooling is the main process leading to the condensation of gas in the dark matter potential wells and consequently to star and structure formation. In a metal-free environment, the main available coolants are H, He, H$_2$ and HD; once the gas is enriched with metals, these also become important in defining the cooling properties of the gas. We discuss the implementation in Gadget-2 of molecular and metal cooling at temperatures lower that $\rm10^4 K$, following the time dependent properties of the gas and pollution from stellar evolution. We have checked the validity of our scheme comparing the results of some test runs with previous calculations of cosmic abundance evolution and structure formation, finding excellent agreement. We have also investigated the relevance of molecule and metal cooling in some specific cases, finding that inclusion of HD cooling results in a higher clumping factor of the gas at high redshifts, while metal cooling at low temperatures can have a significant impact on the formation and evolution of cold objects.Comment: 9 pages, plus appendices. Revised version. MNRAS accepte

Correcting political and consumer misperceptions

While fact-checking has grown dramatically in the last decade, little is known about the relative effectiveness of different formats in correcting false beliefs or overcoming partisan resistance to new information. This article addresses that gap by using theories from communication and psychology to compare two prevailing approaches: An online experiment examined how the use of visual “truth scales” interacts with partisanship to shape the effectiveness of corrections. We find that truth scales make fact-checks more effective in some conditions. Contrary to theoretical predictions and the fears of some journalists, their use does not increase partisan backlash against the correction or the organization that produced it

In the mood for a commercial break? A model of consumer response to television commercials during sensitive news

Marketers decided to pull over $100 million worth of commercials from network, cable, local and syndicated TV outlets on the United States market in the first 48 hours of the 2003 Iraq war. Given this loss to advertisers and media, we looked at how consumers respond to commercials during wartime. Would they change their attitude towards products that are advertised during war coverage? Would they consider advertising during such coverage inappropriate? Consistent with previous mood theory study findings, the results suggest a positive relationship between the mood generated by the interest in the program content and support for advertisements during the program. We also found that factors influencing the mood induced by war coverage were support for the President’s decisions and for the war. These findings open the door to a completely new line of research on attitudes towards media contents. Future research could explore the relationship between political ideology of viewers and their mood when watching sensitive news content.advertising context, attitude toward commercials, interest in program content, mood theory, news.