Circular 53

The regeneration of interior Alaska’s commercial forest lands is mandated by Alaska’s Forest Resources and Practices Act (1979). This act requires that regeneration be established adequate to ensure a sustained yield on forested lands from which the timber has been harvested. Post-logging regeneration efforts now are aimed at exposing mineral soil for the natural seeding of white spruce. Soil exposure has been accomplished by blade scarifying with a crawler tractor which provides large seed sites or by using a Bracke-type patch scarifier which produces small seed sites of about 2 ft2. Arlidge (1967) reports that larger seedbeds have greater regeneration success than smaller ones. Some researchers have found that the regeneration of the larger plots may be too successful, requiring weeding and precommercial thinning to bring stocking to satisfactory levels (Zasada and Grigal 1978). The Alaska Division of Forestry (DOF) has not been satisfied with the cost or effectiveness of either of these site-preparation practices.Introduction -- Methods -- Results and Discussion: Contractor #2, Contractor #3 -- Comparisons -- Conclusions -- Resources Cite

Status of magnetic suspension technology

The reasons for the continuing interest in the Magnetic Suspension and Balance System (MSBS) are highlighted. Typical problems that can arise because of model-support interference in a transonic wind tunnel are shown to illustrate the need for MSBS. The two magnetic suspension systems in operation at Langley are the only ones active in the U.S. One of these systems is the 13 inch MSBS which was borrowed from the Air Force Arnold Engineering Development Center. The other system is the 6 inch MSBS which was developed by MIT Aerophysics Laboratory with NASA and DOD funding. Each of these systems is combined with a subsonic wind tunnel. Ongoing research in both of these systems is covered. Last year, Madison Magnetics, Inc., completed a contractual design and cost study utilizing some advance concepts for a large MSBS which would be compatible with an 8 foot transonic wind tunnel and the highlights of the study are presented. Sverdrup Technology, Inc., recently performed a study under contract for Langley on the potential usefulness to the aerospace industry of a proposed large MSBS combined with a suitable transonic wind tunnel. The results of that study are discussed. Langley has partially funded the MSBS work at the University of Southampton for about 6 years under a grant arrangement and the major results are summarized

Bosnia’s Paralyzed Peace

This study offers a powerful blow by blow analysis of the attempts to create peace in BiH since the Dayton Agreement. According to Christopher Bennett, Dayton provided a “balance of terror,” was full of unrealistic deadlines, and aimed at providing internationals with an exit strategy (81) and international involvement constantly suffered from an “enforcement gap” (110) derived from the contradiction between trusteeship and democracy as well as limited resources (114). It has even reinforced existing power structures (the ethnos rather than the demos (116, 182), connected to para-states, and undermined democracy. A “new ethno-national reality now exists” even extending to the education system (244). Bennett expertly lays bare the oddity and inconsistencies of the post-Dayton BiH framework for politics. There is much to agree with, and to learn from the analysis as it proceeds chronologically. Even if one does not agree with the final argument and conclusions presented to the reader, it is a very well written and extremely insightful, detailed volume (though more thorough references would have been useful to the sources it uses)

The international peace architecture: a grand but flawed design for peacemaking

Efforts to solve conflict and establish peace across the world have evolved into what might be called an ‘international peace architecture’. Oliver P. Richmond tracks the six stages through which this system has emerged and asks whether it is still capable of responding to the demands of modern conflicts