5,906 research outputs found

    A proposed adjustable RF cable connector

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    In system that requires negligible loss, it may be necessary to adjust cable length to exact multiple of transmitted wavelength. Adjustable cable connector saves time and cost by eliminating need to add to or cut from cable. Device was especially designed for use with high frequencies. For particular application, connector of suitable dimensions should be used

    Makutano Junction: A Village Soap Opera for Kenyan TV. An Interview with Producer and Mediae.org Director and Co-founder David Campbell

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    In this article comments by politician Boris Johnson and economist Edward Glaeser exemplify narratives of global urbanization that portray rural villages as redundant and perpetuate outdated notions of urban–rural division. Simultaneously, traditional urban–rural dialectics are distorted by divisive new urban projects like gated communities styled as villages. This paper argues for development models that acknowledge the vital environmental and economic roles played by rural villages, and opposes artificially created “villages” in cities. In so doing, alternative readings of rurality and villages by Rem Koolhaas, Brazilian land reformers, Mahatma Gandhi, and critics of contemporary Indian literature and urbanism are considered

    Depth profiling of PAHs treated with activated carbon using in-situ SPME

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    Novel and efficient methods to measure the bioavailability of hydrophobic organic contaminants (HOCs) in contaminated sediments will play an important role in the acceptance of alternative sediment remediation strategies. In this project, solid phase microextraction (SPME) fibers, protected in perforated steel tubes, were used as in situ passive samplers to measure the treatment of activated carbon (AC) in polycyclic aromatic hydrocarbon (PAH) contaminated sediment. Contaminated sediment was treated with two modes of AC waterjet amendment. In the first treatment, a single 2-min injection was shot into the center of a test vessel and in the second treatment, multiple 7-sec injections in a grid were placed in sediment. In the single injection no treatment was observed 5 cm away from the injection, while at 2.5 cm greater than 90% removal of PAH pore water concentrations were observed. In the multiple injection experiment greater than 90% PAH pore water reductions were observed throughout the test vessel. Highly contaminated and less contaminated sediments were mixed with 0-5% AC by weight to develop AC treatment curves. Over 99% reduction in PAH bioavailability was observed in the less contaminated sediment at 3% AC while 99% removal was never reached even at 5% AC addition in the highly contaminated sediment. Clear treatment curves were observed for both contaminated sediments, though they were very different. In situ equilibration times were 120,215 and 250 hours for phenanthrene, pyrene and benzo(a)Anthracene respetively [sic]. The results show that in situ SPME is a viable method to observe AC treatment and evaluate reductions in bioavailability --Abstract, Page iv

    Jomini and Naval Special Operations Forces—An Applied-Competition Approach to Russia

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    A version of Jomini’s campaigning theory, in combination with maritime special-operations capabilities, offers a convincing maritime approach for contesting Russia’s malign activity in Europe while remaining below the level of armed conflict and supporting a broader conventional effort to prepare a war-fighting environment by using irregular warfare to secure advantages prior to conflicts

    Of Special Interest

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    Learning from non-linear ecosystem dynamics is vital for achieving land degradation neutrality

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    Land Degradation Neutrality is one of the Sustainable Development Goal targets, requiring on-going degradation to be balanced by restoration and sustainable land management. However, restoration and efforts to prevent degradation have often failed to deliver expected benefits, despite enormous investments. Better acknowledging the close relationships between climate, land management and non-linear ecosystem dynamics can help restoration activities to meet their intended goals, while supporting climate change adaptation and mitigation. This paper is the first to link ecological theory of non-linear ecosystem dynamics to Land Degradation Neutrality offering essential insights into appropriate timings, climate-induced windows of opportunities and risks, and the financial viability of investments. These novel insights are pre-requisites for meaningful operationalisation and monitoring of progress towards Land Degradation Neutrality

    Differential Black Walnut Growth on a Recommended Soil Map Unit: Investigation of Related Soil Chemical and Physical Properties

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    Black walnut (Juglans nigra L.) is one of the best known and most valuable trees in Kentucky. However, due to its high value, the species has been aggressively harvested from natural stands, creating a limited supply of quality black walnut trees. Many landowners recognize this as an investment opportunity and have placed small tracts of unused land into black walnut production

    Urban Resistance to Occupation: An Underestimated Element of Land Warfare

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    With the world trending toward urbanization, and Russia and China acting aggressively toward Ukraine and Taiwan, respectively, the conduct of irregular warfare in built-up environments—specifically, urban resistance to occupation—merits greater study. The authors’ Dutch-language and primary source research on the Netherlands’ World War II urban resistance to German occupation makes this article unique. It provides deeper insights into the occupation experiences of a highly urbanized, densely populated country in which clandestine underground and auxiliary elements played paramount roles in resistance efforts for most of the occupation period. It also illustrates the feasibility of overt, guerrilla-based activity in urban environments during the final phase of a conflict and offers insight into an understudied Landpower activity that modern at-risk countries should develop and hone
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