Species and temperature measurement in H2/O2 rocket flow fields by means of Raman scattering diagnostics

Validation of Computational Fluid Dynamics (CFD) codes developed for prediction and evaluation of rocket performance is hampered by a lack of experimental data. Non-intrusive laser based diagnostics are needed to provide spatially and temporally resolved gas dynamic and fluid dynamic measurements. This paper reports the first non-intrusive temperature and species measurements in the plume of a 110 N gaseous hydrogen/oxygen thruster at and below ambient pressures, obtained with spontaneous Raman spectroscopy. Measurements at 10 mm downstream of the exit plane are compared with predictions from a numerical solution of the axisymmetric Navier-Stokes and species transport equations with chemical kinetics, which fully model the combustor-nozzle-plume flowfield. The experimentally determined oxygen number density at the centerline at 10 mm downstream of the exit plane is four times that predicted by the model. The experimental number density data fall between those numerically predicted for the exit and 10 mm downstream planes in both magnitude and radial gradient. The predicted temperature levels are within 10 to 15 percent of measured values. Some of the discrepancies between experimental data and predictions result from not modeling the three dimensional core flow injection mixing process, facility back pressure effects, and possible diffuser-thruster interactions

The Betrayed Partner’s Experiences with Grief and Loss Following the Discovery of an Extramarital Affair

Betrayed partners experience a great amount of changes, losses, and grief following the discovery of an extramarital affair. The following study examines the stories of two women and four men from various areas across the United States who were the betrayed partner in a marriage that experienced extramarital affairs. A qualitative approach using semi-structured interviews were conducted to obtain information to answer the following research question: What are the betrayed partner’s experiences with grief and loss following the discovery of an extramarital affair within their marriage? Several themes arose from the findings including: 1) immediate thoughts, feelings, and behaviors such as shock, confusion, anger, and disbelief, 2) wanting to fix the relationship using counseling and salvaging the relationship, 3) life alterations caused by the affair including increase in self-esteem, not wanting to marry again, having to continue interactions with the betrayer, learning that not everyone is untrustworthy, emotional instability, and legal action, 4) grief and loss including loss of the relationship, divorce, shared custody of the children, loss of their partner’s family, loss of friends, shattered dreams and expectations, physical and emotional losses, loss of trust, adjusting to being primary custody provider, and financial hardships. Participants identified several coping strategies such as: family, religion, friends, individual counseling, reading books, granting forgiveness, and attending support groups. This study provides a broad look at the losses and grief, which are often times overlooked aspects of infidelity

SLOCC invariant and semi-invariants for SLOCC classification of four-qubits

We show there are at least 28 distinct true SLOCC entanglement classes for four-qubits by means of SLOCC invariant and semi-invariants and derive the number of the degenerated SLOCC classes for n-qubits.Comment: 22 pages, no figures, 9 tables, submit the paper to a journa

I don\u27t always look at memes, but when I do, it\u27s for a class : Using Memes to Demonstrate Language Rules

This activity uses Internet memes to demonstrate the pervasiveness of language rules and culture’s effect on language in online culture. Numerous introductory communication courses include a discussion on verbal communication that focuses on language rules and the effects of culture on verbal communication. The most relevant language rules for memes are the regulative rules that guide action and how we use language (Cronen, Pearce, & Harris, 1979). In this exercise, students analyze and evaluate language rules present in popular online memes. The students identify the language rule utilized in each of a pre-chosen set of Internet memes and generate at least three memes of their own that fit within the theme and language rules of the meme as a communication form. Students also answer questions regarding culture’s role in meme topics and language choices

Communication Apprehension about Death, Religious Group Affiliation, and Religiosity: Predictors of Organ and Body Donation Decisions

Communication willingness has previously been identified as an important communication factor in influencing individuals’ decisions to become an organ donor. Missing from this conversation is the role of communication apprehension about death and its impact on donation decisions. The purpose of this study was to examine the relationships between communication apprehension about death, religiosity, and religious affiliation, and donation decisions. Three hundred and thirty-three individuals participated in an online survey. Findings suggest that communication apprehension about death, especially communication avoidance about death, negatively impact donation decisions. Additionally, religiosity and affiliation with a specific religion also negatively impact donation decisions. These variables were also predictors of organ and body donation. The findings show a need for more research on what prevents conversations about donation. Additionally, the stark difference between organ donation likelihood and body donation likelihood underscore the need for communication scholars to examine communication about body donation

Development and Validation of the Communication Apprehension About Death Scale

Two studies (N=621) were conducted to develop and initially validate the Communication Apprehension About Death Scale (CADS). In Study 1, 302 general public participants completed a preliminary list of 66 items. An exploratory factor analysis identified two distinct dimensions of communication apprehension about death: communication anxiety and communication avoidance. A different group of participants (n=319) participated in Study 2. Participants in Study 2 completed the CADS measure, a fear of death measure, and a general communication apprehension measure. Concurrent validity support was provided through the significant positive correlations between communication apprehension about death and fear of death as well as communication apprehension about death and general communication apprehension. Collectively, the results suggest that the CADS is a reliable and valid self-report measure of communication apprehension about death. We conclude with a discussion of the findings as well as future directions needed to more critically examine CADS

“We Were Not Prepared to Tell People Yet”: Confidentiality Breaches and Boundary Turbulence on Facebook

Communication Privacy Management theory provides a framework for investigating confidentiality breaches that occur on Facebook. Open-ended online questionnaires served as mechanism for collecting data about privacy violations and the resulting boundary turbulence. Privacy violations validated three a priori categories (Petronio & Reierson, 2009) of confidentiality breaches (privacy ownership violations, discrepancy breaches of privacy, and pre-emptive privacy control). Findings indicated that the lack of established explicit privacy rules led to privacy violations and boundary turbulence. Results also provided insight regarding motivations of privacy violations, reactions to privacy violations, and the role of privacy rules in the violation

Adaptive query-based sampling of distributed collections

As part of a Distributed Information Retrieval system a de-scription of each remote information resource, archive or repository is usually stored centrally in order to facilitate resource selection. The ac-quisition ofprecise resourcedescriptionsistherefore animportantphase in Distributed Information Retrieval, as the quality of such represen-tations will impact on selection accuracy, and ultimately retrieval per-formance. While Query-Based Sampling is currently used for content discovery of uncooperative resources, the application of this technique is dependent upon heuristic guidelines to determine when a sufficiently accurate representation of each remote resource has been obtained. In this paper we address this shortcoming by using the Predictive Likelihood to provide both an indication of thequality of an acquired resource description estimate, and when a sufficiently good representation of a resource hasbeen obtained during Query-Based Sampling

Phase space spinor amplitudes for spin 1/2 systems

The concept of phase space amplitudes for systems with continuous degrees of freedom is generalized to finite-dimensional spin systems. Complex amplitudes are obtained on both a sphere and a finite lattice, in each case enabling a more fundamental description of pure spin states than that previously given by Wigner functions. In each case the Wigner function can be expressed as the star product of the amplitude and its conjugate, so providing a generalized Born interpretation of amplitudes that emphasizes their more fundamental status. The ordinary product of the amplitude and its conjugate produces a (generalized) spin Husimi function. The case of spin-\half is treated in detail, and it is shown that phase space amplitudes on the sphere transform correctly as spinors under under rotations, despite their expression in terms of spherical harmonics. Spin amplitudes on a lattice are also found to transform as spinors. Applications are given to the phase space description of state superposition, and to the evolution in phase space of the state of a spin-\half magnetic dipole in a time-dependent magnetic field.Comment: 19 pages, added new results, fixed typo