Rapid Technique for Liquid Scintillation Counting of Carbon-14-labelled Barium Carbonate

Rapid technique for liquid scintillation counting of carbon-14-labelled barium carbonat

Radiative hydrodynamic modelling and observations of the X-class solar flare on 2011 March 9

We investigated the response of the solar atmosphere to non-thermal electron beam heating using the radiative transfer and hydrodynamics modelling code RADYN. The temporal evolution of the parameters that describe the non-thermal electron energy distribution were derived from hard X-ray observations of a particular flare, and we compared the modelled and observed parameters. The evolution of the non-thermal electron beam parameters during the X1.5 solar flare on 2011 March 9 were obtained from analysis of RHESSI X-ray spectra. The RADYN flare model was allowed to evolve for 110 seconds, after which the electron beam heating was ended, and was then allowed to continue evolving for a further 300s. The modelled flare parameters were compared to the observed parameters determined from extreme-ultraviolet spectroscopy. The model produced a hotter and denser flare loop than that observed and also cooled more rapidly, suggesting that additional energy input in the decay phase of the flare is required. In the explosive evaporation phase a region of high-density cool material propagated upward through the corona. This material underwent a rapid increase in temperature as it was unable to radiate away all of the energy deposited across it by the non-thermal electron beam and via thermal conduction. A narrow and high-density ($n_{e} \le 10^{15}$ cm$^{-3}$) region at the base of the flare transition region was the source of optical line emission in the model atmosphere. The collision-stopping depth of electrons was calculated throughout the evolution of the flare, and it was found that the compression of the lower atmosphere may permit electrons to penetrate farther into a flaring atmosphere compared to a quiet Sun atmosphere.Comment: 12 pages, 12 figure

Keeping up with the Times: Improving the Modern Counselor through Professional Identity Development, Technological Policy, and Positive Risk Taking

Awareness of ‘best practices’ and ‘critical issues’ assists counselors-in-training as they attempt to navigate the expectations of their programs and prepare for their future careers. This article identified the development of a professional identity as a significant goal for counselors-in-training and a curriculum responsibility for counselor educators. The authors also identified two critical issues that counselors-in-training and working professionals face currently. The first critical issue addressed is how technologies fit into counseling practices and their impact on the counseling process. The second critical issue is the potential impact of counselor-client willingness to take a risk with therapeutic options. New and seasoned counselors alike will be met with challenges as they develop and grow in their professional identity. Counselors can support their own professional development by understanding ‘critical issues’ that have the potential to impact professional identity as well as gleaning the knowledge of ‘best practices’ for ethical decision-making

Quick actuating closure and handling system

A quick activating closure and handling system, which utilizes conical sections for locking, was developed to allow quick access to the combustor internal components of the 8 ft High Temperature Tunnel. These critical components include the existing methane spraybar, a transpiration cooled nozzle and the new liquid oxygen (LOX) injection system housed within the combustor. A substantial cost savings will be realized once the mechanism is installed since it will substantially reduce the access time and increase the time available for conducting wind tunnel tests. A need exists for more frequent inspections when the wind tunnel operates at the more severe conditions generated by using LOX in the combustor. A loads analysis and a structural (finite element) analysis were conducted to verify that the new closure system is compatible with the existing pressure shell. In addition, strain gages were placed on the pressure vessel to verify how the pressure shell reacts to transient pressure loads. A scale model of the new closure system was built to verify the operation of the conical sections in the locking mechanisms

Understanding Landowner and Municipal Official Perceptions of Water Quality in a Local Watershed

Click on the PDF for the full report. Visit the HDRU website for a complete listing of HDRU publications at: http://hdru.dnr.cornell.edu

Incentives to Encourage Landowners’ Management for New England Cottontail Rabbit Habitat in New York’s Eastern Hudson Valley

Click on the PDF for the full report. Visit the HDRU website for a complete listing of HDRU publications at: http://hdru.dnr.cornell.edu

Simulations of the Mg II k and Ca II 8542 lines from an AlfvÉn Wave-heated Flare Chromosphere

We use radiation hydrodynamic simulations to examine two models of solar flare chromospheric heating: Alfven wave dissipation and electron beam collisional losses. Both mechanisms are capable of strong chro- ´ mospheric heating, and we show that the distinctive atmospheric evolution in the mid-to-upper chromosphere results in Mg ii k-line emission that should be observably different between wave-heated and beam-heated simulations. We also present Ca ii 8542Å profiles which are formed slightly deeper in the chromosphere. The Mg ii k-line profiles from our wave-heated simulation are quite different from those from a beam-heated model and are more consistent with IRIS observations. The predicted differences between the Ca ii 8542Å in the two models are small. We conclude that careful observational and theoretical study of lines formed in the mid-toupper chromosphere holds genuine promise for distinguishing between competing models for chromospheric heating in flares

Conservation and Land Use Planning: Linking Municipal Capacity and Biodiversity Outcomes

CaRDI Research & Policy Brief Issue 7

Management Activities of Private Forest Landowners in New York State

CaRDI Research & Policy Brief, Issue 15. Click on the PDF for the full report. Visit the HDRU website for a complete listing of HDRU publications at: http://hdru.dnr.cornell.edu/. A complete listing of CaRDI publications can be found on its site: https://cardi.cals.cornell.edu/

Community Adaptation to Flooding in a Changing Climate: Municipal Officials’ Actions Decision-Making and Barriers

CaRDI Research & Policy Brief Issue 5