Design concepts

Engineering design studies on noise reduction in turbofan duct of DC-8 aircraft engin

Airport noise

The problem of airport noise at several airports and air bases is detailed. Community reactions to the noise, steps taken to reduce jet engine noise, and the effect of airport use restrictions and curfews on air transportation are discussed. The adverse effect of changes in allowable operational noise on airport safety and altenative means for reducing noise pollution are considered. Community-airport relations and public relations are discussed

Motives and Mental Health in Adults

The relation between depressive symptomology and SU has been previously established; however, there is a lack of a consistent pattern of comorbidity (Swendsen & Merikangas, 2000). Further understanding of factors that contribute to or strengthen this relation is essential as these may be targets for intervention. Models of both SU and depression include two motivational processes, approach and avoidance (Ertel et al., 2018; Trew, 2011). SU motives, or the reasons why individuals use substances, can be subdivided based on the functions underlying SU; 1) to avoid unpleasant states, either externally (i.e., using substances to avoid rejection from others; conformity) or internally (i.e., using substance to mitigate negative affect; coping), or 2) to approach rewarding states, either externally (i.e., using substances to approach others or have favorable social outcomes; social) or internally (i.e., using substances to increase positive affect; enhancement) (Cooper et al., 2015). SU motives have been found to predict subsequent SU and substance-use-related negative consequences (Cooper et al., 2015), with those high in depressive symptomology demonstrating a stronger relation between motives and SUproblems (e.g., Foster et al., 2014b). Additionally, motives for one substance have predicted the use of, and consequences related to, another substance and cross-over effects (Foster et al., 2014a). Further, increased endorsement of coping motives for SU has been associated with worsening depressive symptomology (e.g., Colder et al., 2019). Although preliminary evidence indicates that SU motives can exacerbate depressive symptomology and increase cross-SU, little is known regarding how depressive symptomology and SUmotives interact to predict SU and related negative consequences. Thus, the aims of the current study include 1) examining the relation between depressive symptomology and SU and related negative consequences (i.e., alcohol, cannabis, tobacco) and 2) how the strength of the relation between depressive symptomology and SU and related negative consequences may vary as a function of SU motives (i.e., alcohol, cannabis, tobacco). Given previous research, SU is expected to be related to depressive symptomology. It is expected that the relation between SU and depressive symptomology will be moderated by coping, social, and enhancement SU motives; however, given the few studies on cross-substance motives, the effects on the relation between depressive symptomology, varying SU, and related consequences are exploratory. By better understanding these relations, transdiagnostic intervention approaches targeting underlying etiological and maintenance factors (e.g., emotional regulation, experiential avoidance) could lead to significant intervention change. Keywords: Depression, Substance Use, Motive

Deregulation of the Natural Gas Industry

4 pages. Hot Topic: Implications of FERC Order No. 636 for the Natural Gas Industry. After one year of natural gas pipeline deregulation, what impact has Order No. 636, issued by the Federal Energy Regulatory Commission in 1992, had on the natural gas industry - specifically, pipeline and local distribution companies? What additional changes might occur? Elisabeth Pendley, of KN Energy and the NRLC 1995 El Paso Natural Gas Law Fellow, will discuss the dramatic changes to the natural gas industry caused by FERC Order No. 636

Noise predictions and economic effects of nacelle modifications to McDonnell Douglas DC-8 airplanes

Noise predictions and economics of nacelle modifications to DC-8 aircraf

The New Maritime Strategy—A Lost Opportunity

The new maritime strategy lists threats and catalogs core capabilities for maritime forces, but beyond that, unfortunately, it marks a lost opportunity to develop an effective and comprehensive military strategy for this New Era