Stakeholder Perceptions on the Need for Updated Tree Species Distribution Maps

Tree species distributions presented as range maps are powerful tools for forest-based decision-making processes. In the United States, Silvics of North America is a well-known reference for over 200 tree species. However, the current range maps are likely outdated due to changes in land use, advancements in technology, shifts in plant hardiness zones due to climate change, and shifting societal values that influence the development of these resources. Therefore, a survey was distributed to two stakeholder groups, registered foresters in four states and members of several professional organizations, to gain insight into whether Silvics of North America range maps should be updated. Although the survey delivery method varied between the two survey sampling frames, the opinions on updating species range maps between the two stakeholder groups were similar. Both groups indicated that updating the current range maps would be valuable and would best be informed by remote sensing, national field inventories, and expert insight, and by adding color and perhaps importance classes.

Capacitor Discharge Spot Welding of Aluminum, Part 1: Weldability Assessments

A key aspect of integrating automotive sheet into automotive production are the costs associated with joining. While the majority of sheet steel assembly is done with resistance spot welding, that has not readily translated to aluminum. Resistance spot welding of aluminum sheet is challenged by high current demand as well as reduced electrode life. In the latter case, direct current (DC) power supplied by state-of-the-art systems has exacerbated the problem. Recently, technology employing capacitor discharge (CD) welding in conjunction with polarity switching has been developed. This work is a first effort in examining the response of resistance spot welding on aluminum sheet to polarity-switching CD power. In this paper, the current range response between medium-frequency DC (MFDC) and polarity-switching CD was investigated. It was found that polarity-switching CD welding offered improved current ranges over MFDC. In addition, replicate mechanical testing cross-tension results were similar, but tensile shear strengths improved nominally 20–25%. Finally, some limited tests were done to assess the suitability of CD resistance spot welding in the presence of an adhesive. Current range tests with and without a prepulse were done, and both showed excellent weldability.

IMPACT OF CORONA DISCHARGE ON SERRATIA MARCESCENS AND PSEUDOMONAS SYRINGAE INACTIVATION

This work investigates the influence of corona discharge working in different treatment modes on the Serratia marcescens and Pseudomonas syringae bacteria cultures. The current-voltage characteristics of the discharge were measured in the 4…50 μA current range. The typical current and voltage oscillograms of corona discharge were measured when the pin’s point was near the water surface. Several treatment modes were discovered, which allowed to destroy or decrease the quantity of Serratia marcescens and Pseudomonas syringae bacteria by several orders of magnitude using 0.3 W corona discharge. The absorption spectra of the distilled water treated by the corona discharge were measured.

Social Theory and Legal Theory: Contemporary Interactions

This article identifies points of comparison between legal theory and social theory and possibilities for research communication between them. The current range of both fields is such that each must be seen as a compendium of very diverse intellectual projects. So, the article explores particular contemporary themes around which the interests of juristic scholars and social theorists are converging, albeit that their theoretical aims often differ. Contrasting and complementary juristic and social theoretical perspectives are considered in relation to the following: the future of legal individualism, the identity of law as a social phenomenon, the relations of law and power, the contribution of law to societal integration, and the changing relation of law and the state. The article argues that these five themes reveal major intellectual challenges for both legal theory and social theory and productive future areas for inquiry. Expected final online publication date for the Annual Review of Law and Social Science, Volume 17 is October 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.