Statistical Uncertainties in Temperature Diagnostics for Hot Coronal Plasma Using the ASCA SIS

Statistical uncertainties in determining the temperatures of hot (0.5 keV to 10 keV) coronal plasmas are investigated. The statistical precision of various spectral temperature diagnostics is established by analyzing synthetic ASCA Solid-state Imaging Spectrometer (SIS) CCD spectra. The diagnostics considered are the ratio of hydrogen-like to helium-like line complexes of $Z\ge14$ elements, line-free portions of the continuum, and the entire spectrum. While fits to the entire spectrum yield the highest statistical precision, it is argued that fits to the line-free continuum are less susceptible to atomic data uncertainties but lead to a modest increase in statistical uncertainty over full spectral fits. Temperatures deduced from line ratios can have similar accuracy but only over a narrow range of temperatures. Convenient estimates of statistical accuracies for the various temperature diagnostics are provided which may be used in planning ASCA SIS observations.Comment: postscript file of 8 pages+3 figures; 4 files tarred, compressed and uuencoded. To appear in the Astrophysical Journal Letters; contents copyright 1994 American Astronomical Societ

A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3

Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF3. This mode signals the cross-over from one-dimensional to three-dimensional behavior and indicates a reduction in the ordered spin moment of a spin-1/2 antiferromagnet. The measurements are compared with recent quantum field theory results and are found to be in excellent agreement. A feature of the data not predicted by theory is a damping of the mode by decay processes to the transverse spin-wave branches.Comment: 9 pages of text plus 4 postscript figures (1 color

Internal construct validity of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS): a Rasch analysis using data from the Scottish Health Education Population Survey

Background: The Warwick-Edinburgh Mental Well-Being Scale (WEMWBS) was developed to meet demand for instruments to measure mental well-being. It comprises 14 positively phrased Likert-style items and fulfils classic criteria for scale development. We report here the internal construct validity of WEMWBS from the perspective of the Rasch measurement model. Methods: The model was applied to data collected from 779 respondents in Wave 12 (Autumn 2006) of the Scottish Health Education Population Survey. Respondents were aged 16–74 (average 41.9) yrs. Results: Initial fit to model expectations was poor. The items 'I've been feeling good about myself', 'I've been interested in new things' and 'I've been feeling cheerful' all showed significant misfit to model expectations, and were deleted. This led to a marginal improvement in fit to the model. After further analysis, more items were deleted and a strict unidimensional seven item scale (the Short Warwick Edinburgh Mental Well-Being Scale (SWEMWBS)) was resolved. Many items deleted because of misfit with model expectations showed considerable bias for gender. Two retained items also demonstrated bias for gender but, at the scale level, cancelled out. One further retained item 'I've been feeling optimistic about the future' showed bias for age. The correlation between the 14 item and 7 item versions was 0.954. Given fit to the Rasch model, and strict unidimensionality, SWEMWBS provides an interval scale estimate of mental well-being. Conclusion: A short 7 item version of WEMWBS was found to satisfy the strict unidimensionality expectations of the Rasch model, and be largely free of bias. This scale, SWEMWBS, provides a raw score-interval scale transformation for use in parametric procedures. In terms of face validity, SWEMWBS presents a more restricted view of mental well-being than the 14 item WEMWBS, with most items representing aspects of psychological and eudemonic well-being, and few covering hedonic well-being or affect. However, robust measurement properties combined with brevity make SWEMWBS preferable to WEMWBS at present for monitoring mental well-being in populations. Where face validity is an issue there remain arguments for continuing to collect data on the full 14 item WEMWBS

The Cauldron, 2015, Issue 11

Issue 11 of The Cauldron focused on No shave-November, a science conference, CSU MBA program, CABsino, women\u27s basketball preseason opener, women\u27s fencing, online fantasy football leagues, Bobby Coyne, Paula Poundstone, New Politics, reviews on “A Gentleman’s Guide to Love & Murder” and Ubu Roi , reviews on Undertale and Burnt , and opinions on college 101, government participation, adopting pets, and images of weight.https://engagedscholarship.csuohio.edu/cauldron_archives/1010/thumbnail.jp

The Cauldron, 2015, Issue 12

Issue 12 of The Cauldron discussed cheap places to go around Cleveland, safe places around CSU, an engagement program, Delta Zeta\u27s creation, Men\u27s soccer end of season, CSU running club, CSU club hockey, a diversity fashion show, Halo 5 review, Peanuts movie review, reviews of Beach Slang and Ellie Goulding, a review on Bourbon Street Barrel Room, and opinions on Starbucks Christmas, the World Health Organization\u27s facts about red meat, and love.https://engagedscholarship.csuohio.edu/cauldron_archives/1011/thumbnail.jp

The Cauldron, 2015, Issue 14

The Cauldron issue 14 covers Engineering students senior proposals, MSA fundraiser for Syrian refugees, students voice concerns to President Berkman, Berkman hosts annual holiday reception, November crime watch, CSU Vikings start new era at Quicken Loans Arena, Browns season over, Rule 5 Draft may hurt Tribe, Winter break checklist, must-see holiday performances, senior project collab, A Head Full of Dreams album review, best and brightest albums of 2015, Victor Frankenstein review, Creed review, misconceptions about Planned Parenthood, praying for Paris, disadvantages of taking the bus to class.https://engagedscholarship.csuohio.edu/cauldron_archives/1013/thumbnail.jp

The Cauldron, 2015, Issue 14

The Cauldron issue 14 covers Engineering students senior proposals, MSA fundraiser for Syrian refugees, students voice concerns to President Berkman, Berkman hosts annual holiday reception, November crime watch, CSU Vikings start new era at Quicken Loans Arena, Browns season over, Rule 5 Draft may hurt Tribe, Winter break checklist, must-see holiday performances, senior project collab, A Head Full of Dreams album review, best and brightest albums of 2015, Victor Frankenstein review, Creed review, misconceptions about Planned Parenthood, praying for Paris, disadvantages of taking the bus to class.https://engagedscholarship.csuohio.edu/cauldron_archives/1013/thumbnail.jp

The Cauldron, 2015, Issue 11

Issue 11 of The Cauldron focused on No shave-November, a science conference, CSU MBA program, CABsino, women\u27s basketball preseason opener, women\u27s fencing, online fantasy football leagues, Bobby Coyne, Paula Poundstone, New Politics, reviews on “A Gentleman’s Guide to Love & Murder” and Ubu Roi , reviews on Undertale and Burnt , and opinions on college 101, government participation, adopting pets, and images of weight.https://engagedscholarship.csuohio.edu/cauldron_archives/1010/thumbnail.jp

The Cauldron, 2015, Issue 13

Issue 13 of The Cauldron we discuss the Bernie Sanders rally at the Wolstein Center, winter break extended, professors speak out on course evaluations, 10th International Education Day, business building damaged by high winds, Vikings impresses in home opener, Cavs continue strong, the problem with internships, Almost, Maine CSU production, Mockingjay Part 2 review, Spectre review, Broadway star speaks to CSU students, Fallout 4 review, Art Angels album review, Bernie rally at CSU, Black Friday American contradiction, Conference Services needs to step up, praying for Paris.https://engagedscholarship.csuohio.edu/cauldron_archives/1012/thumbnail.jp

The Cauldron, 2015, Issue 10

Issue 10 focused around eating disorders, a pro-choice rally held by URGE AND SFC, the Fenn Tower of Terror Halloween party, reviews on the Crucible, The Last Witch Hunter, Crimson Peak, and Secret Garden , the volleyball team leading the Horizon League, Men\u27s Swimming, and opinions on Daylight Savings, Issue 3, and Autism as addressed on Sesame Street.https://engagedscholarship.csuohio.edu/cauldron_archives/1009/thumbnail.jp