Received optical power calculations for optical communications link performance analysis

The factors affecting optical communication link performance differ substantially from those at microwave frequencies, due to the drastically differing technologies, modulation formats, and effects of quantum noise in optical communications. In addition detailed design control table calculations for optical systems are less well developed than corresponding microwave system techniques, reflecting the relatively less mature state of development of optical communications. Described below are detailed calculations of received optical signal and background power in optical communication systems, with emphasis on analytic models for accurately predicting transmitter and receiver system losses

Enhancement of the CAVE computer code

The computer code CAVE (Conduction Analysis via Eigenvalues) is a convenient and efficient computer code for predicting two dimensional temperature histories within thermal protection systems for hypersonic vehicles. The capabilities of CAVE were enhanced by incorporation of the following features into the code: real gas effects in the aerodynamic heating predictions, geometry and aerodynamic heating package for analyses of cone shaped bodies, input option to change from laminar to turbulent heating predictions on leading edges, modification to account for reduction in adiabatic wall temperature with increase in leading sweep, geometry package for two dimensional scramjet engine sidewall, with an option for heat transfer to external and internal surfaces, print out modification to provide tables of select temperatures for plotting and storage, and modifications to the radiation calculation procedure to eliminate temperature oscillations induced by high heating rates. These new features are described

Building Bridges Between Communication Studies and Community: A Praxis-Approach

In an effort to demonstrate the field’s usefulness and essentiality to our world, communication studies’ praxis orientation needs to be clearly pursued and publicized. Implementing service-learning into the communication studies classroom could achieve this goal. Through extending the scholarship of Britt (2012) and Pollack (1999), this article proposes that communication educators ground and articulate their service-learning pedagogy from three different paradigmatic lenses; the experiential paradigm, the social change paradigm, and the citizenship paradigm. Moreover, communication administrators ought to understand the different paradigmatic foundations, which drive service-learning enactment, in an effort to not privilege one perspective over another. The service-learning literature is vast and discusses service-learning’s history, definitional ground, and benefits. This article responds to one criticism of service-learning and provides a way in which communication educators and administrators could respond. By implementing service learning from a clearly articulated paradigmatic foundation, the pedagogy’s praxis orientation is strengthened, opening up the opportunity for more bridges to be built between academy and community

The Selection Process and Characteristics of Judges Appointed to the US Courts of Appeal: From Carter to Clinton

Judges who are appointment to serve on the US Courts of Appeal have the power to change government policy and influence our daily lives. Each President has the opportunity to make an impact on the United States with the types of judges that he chooses to appoint. This study examines the process of nominating and selecting judges, as well as the characteristics of those who have been appointment to serve on the bench. Using data from previous studies conducted by Sheldon Goldman, as well as data gathered from Senate Judiciary Clinton, during his first term in office, to those judges appointed by Presidents Bush, Reagan, and Carter. President Clintong has surpassed President Carter in appointing well qualified women and minority judges to the bench

Embracing Commonplace: Creating Ground for a Life of Rhetorically Engaged Civic Action

This project responds to the question: How do communication educators encourage students to enact the communicative practices necessary for a life of rhetorically engaged civic action? In responding to this question, the academic field of communication studies is recognized as a site for implementing the lessons of rhetoric, democracy, and civic engagement. This project contributes to the civic engagement scholarship from a communication studies perspective by foregrounding human communication as an essential component of the civic engagement process. As an interpretive inquiry, the philosophical thought and the pragmatic action of twentieth-century rhetorician and social activist Jane Addams (1860-1935) provides a hermeneutic entrance point for identifying and understanding the ways in which faculty members in higher education might conduct service-learning in a more responsive and engaged manner. Practicing situated communicative service-learning, a pedagogical approach that embraces the historical moment and the challenges facing service-learning on today\u27s college campus, provides one possibility. Addams\u27s philosophical thought and communicative practices inform the integration of situated communicative service-learning into the communication studies field and college campus through the understanding of commonplace stemming from the Greek understanding of topoi (Aristotle). This praxis-centered approach to service-learning provides ground for students to understand the rhetorical and communicative practices necessary for a life of engaged civic action. By grounding individual communicative practices in a communication classroom setting, communicative habits can grow and flourish in communities

Financial Education Program Evaluation

This study illustrates the process of program evaluation using a logic model. Guided by the Transtheoretical Model of Change and a logic model, this study evaluated the effectiveness of a Retirement and Savings Seminar by measuring participant (n = 54) satisfaction, financial knowledge, financial confidence, and financial behavior change compared to a similar group of 134 non-participants. Participants were very satisfied with the seminar. Their financial knowledge and confidence scores significantly increased from pretest to posttest. Financial knowledge and confidence scores improved more than the comparison group while controlling for group differences in age, income, and pretest scores. Two months later, participants were more likely than the comparison group to have adopted positive financial behaviors as measured by the Financial Preparedness for Retirement Scale. Financial educators can use this study as a model for planning, conducting, and evaluating their program

Visual, Optical and Replica Inspections: Surface Preparation of 650 MHz NB Cavity for PIP-II Linac

Surface preparation of niobium superconducting RF cavities is a critical step for achieving good RF performance under the superconducting state. Surface defect, roughness, and contamination affect the accelerating gradient and quality factor of the cavities. We report surface inspection methods used to control the surface processing of 650 MHz cavities designated for the pre-production and prototype cryomodules for PIP-II linac. The cavity surface was routinely inspected visually, with an optical camera, and by microscopic scanning of surface replicas. This article covers details on the surface inspection methods and surface polishing process used to repair the surface

The Labour Government, the Treasury and the £6 pay policy of July 1975

The 1974-79 Labour Government was elected in a climate of opinion that was fiercely opposed to government intervention in the wage determination process, and was committed to the principles of free collective bargaining in its manifestoes. However, by December 1974 the Treasury was advocating a formal incomes policy, and by July 1975 the government had introduced a £6 flat rate pay norm. With reference to archival sources, the paper demonstrates that TUC and Labour Party opposition to incomes policy was reconciled with the Treasury's advocacy by limiting the Bank of England‟s intervention in the foreign exchange market when sterling came under pressure. This both helped to achieve the Treasury's objective of improving the competitiveness of British industry, and acted as a catalyst for the introduction of incomes policy because the slide could be attributed to a lack of market confidence in British counter-inflation policy

Effects of mesenchymal stromal cells versus serum on tendon healing in a controlled experimental trial in an equine model

Abstract Background Mesenchymal stromal cells (MSC) have shown promising results in the treatment of tendinopathy in equine medicine, making this therapeutic approach seem favorable for translation to human medicine. Having demonstrated that MSC engraft within the tendon lesions after local injection in an equine model, we hypothesized that they would improve tendon healing superior to serum injection alone. Methods Quadrilateral tendon lesions were induced in six horses by mechanical tissue disruption combined with collagenase application 3 weeks before treatment. Adipose-derived MSC suspended in serum or serum alone were then injected intralesionally. Clinical examinations, ultrasound and magnetic resonance imaging were performed over 24 weeks. Tendon biopsies for histological assessment were taken from the hindlimbs 3 weeks after treatment. Horses were sacrificed after 24 weeks and forelimb tendons were subjected to macroscopic and histological examination as well as analysis of musculoskeletal marker expression. Results Tendons injected with MSC showed a transient increase in inflammation and lesion size, as indicated by clinical and imaging parameters between week 3 and 6 (p < 0.05). Thereafter, symptoms decreased in both groups and, except that in MSC-treated tendons, mean lesion signal intensity as seen in T2w magnetic resonance imaging and cellularity as seen in the histology (p < 0.05) were lower, no major differences could be found at week 24. Conclusions These data suggest that MSC have influenced the inflammatory reaction in a way not described in tendinopathy studies before. However, at the endpoint of the current study, 24 weeks after treatment, no distinct improvement was observed in MSC-treated tendons compared to the serum-injected controls. Future studies are necessary to elucidate whether and under which conditions MSC are beneficial for tendon healing before translation into human medicine