An improved processible acetylene-terminated polyimide for composites

The newest member of a family of thermosetting acetylene-substituted polyimide oligomers is HR600P. This oligomer is the isoimide version of the oligomer known as HR600P and Thermid 600. Although both types of material yield the same heat resistant end products after cure, HR600P has much superior processing characteristics. This attributed to its lower melting temperature (160 + or - 10 C, 320 + or - 20 F) in contrast to 202 C (396 F) for Thermid MC-600, its longer gel time at its processing temperature (16 to 30 minutes bvs 3 minutes), and its excellent solubility in low boiling solvents such as tetrahydrofuran, glymes, or 4:1 methyl ethyl ketone/toluene mixtures. These advantages provide more acceptable coating and impregnation procedures, allow for more complete removal at lower temperatures, provide a longer pot life or working time, and allow composite structure fabrication in conventional autoclaves used for epoxy composite curing. The excellent processing characteristics of HR600P allow its use in large area laminated structures, structural composites, and molding compositions

Establishment, Impacts, and Current Range of Spotted Knapweed (\u3ci\u3eCentaurea Stoebe\u3c/i\u3e Ssp. \u3ci\u3eMicranthos\u3c/i\u3e) Biological Control Insects in Michigan

Centaurea stoebe L. ssp. micranthos (Gugler) Hayek (spotted knapweed) is an invasive plant that has been the target of classical biological control in North America for more than four decades. Work in the western U.S. and Canada has shown the seedhead-feeding weevils Larinus minutus Gyllenhal and Larinus obtusus Gyllenhal (Coleoptera: Curculionidae) and the root-boring weevil Cyphocleonus achates (Fahraeus) (Coleoptera: Curculionidae) to be the most effective C. stoebe control agents. These three weevils have recently been introduced into the eastern U.S., including sites in Michigan in 2007 and 2009. In 2010, we made additional releases at six sites in Michigan, monitoring them for three years 2011-13. Here we report on the establishment, impact, and cur- rent range of L. minutus, L. obtusus, and C. achates in Michigan. We also report on the initial results of native plant overseeding treatments that were applied to biological control release sites with the aim of supplementing the nectar source C. stoebe provides. We found that L. minutus has established at all of its Michigan release sites and is widespread in the southwestern part of the state, while L. obtusus has established at the single site where it was released in 2007 and is spreading to adjoining counties. We also found C. achates to be present at four sites and established at one additional site in Michigan, but in all cases abundances are low and dispersal has been minimal (\u3c 10 m). In the three years following the 2010 releases, we found no measurable impacts of these biological control agents on C. stoebe growth, demographics, or plant community metrics. We also found little evidence of native flowering plant establishment at seeded sites. These baseline data will be useful in monitoring the spread and potential impacts of biological control agents on C. stoebe in Michigan

Sunny and Share: Balancing Airspace Entitlement Rights Between Solar Energy Adopters and Their Neighbors

In an effort to ameliorate the effects of climate change, state and local governments have made increasingly large commitments to support solar energy adoption. For solar investments to be successful, however, solar adopters require unobstructed access to sunlight, which is directly at odds with the interests of neighbors and developers who value vertical development, especially in urban centers. To mitigate these looming conflicts, governments have enacted a variety of laws that assign airspace entitlements to either solar adopters or their neighbors. Unfortunately, these solutions are all poorly tailored for dense cities, which is where future airspace conflict is likely to concentrate. In response, this Note proposes a legal scheme designed to protect urban solar investments without ignoring neighbors\u27 property interests: the creation of solar development options ( SDOs ). Under this proposal, the solar adopter would be entitled to unilaterally create a solar easement across his neighbor\u27s airspace. But, in an important break from existing approaches, the owner of the neighboring property would receive a call option to retake her airspace entitlement along with an award of transferable development rights to compensate her for the encumbrance. The benefits of SDOs are numerous: they overcome the significant bargaining impediments plaguing urban stakeholders, properly compensate neighbors for valuable air rights without pricing out solar adopters, and preserve the autonomy of local governments to flexibly balance solar energy adoption and vertical development

Development of improved heat sterilizable potting compounds third quarterly report, 1 jan. - 31 mar. 1964

Development of heat sterilizable potting compoun

Design considerations for lunar base photovoltaic power systems

A survey was made of factors that may affect the design of photovoltaic arrays for a lunar base. These factors, which include the lunar environment and system design criteria, are examined. A photovoltaic power system design with a triangular array geometry is discussed and compared to a nuclear reactor power systems and a power system utilizing both nuclear and solar power sources

Workshop A - Implementing the Design Your Process of Becoming a World Class Engineering Student Project

Many students come into an engineering program lacking a strong commitment to stay in an engineering program and to graduate with an engineering degree. For students to accomplish the challenging goal of graduating in engineering requires a strong commitment, and behaviors and attitudes to follow through that commitment. To strengthen the commitment of the freshman engineering students an innovative project has been developed. The project challenges students to develop their process to become a World-Class Engineering Student . Having freshman engineering students design their individually tailored learning process as part of a semester long project in the setting of a student success focused introduction to engineering course or any freshman engineering course will have a significant impact on their academic success by improving the students’ confidence and motivation to succeed in engineering. This workshop will show participants how to implement the Design your Process to become a World-Class Engineering Student into their own introduction to engineering courses

Center for the Advancement and Study of Tourism

The Center for the Advancement and Study of Tourism (CAST) was established in 1988 as part of the Governor\u27s economic development plan to stimulate tourism as a local and national industry. CAST was awarded a grant from the South Dakota Office of Economic Development to support the three primary Center activities: educational training, community outreach, and research. It is located at Black Hills State University and is funded by the state and by other grant monies

Revisiting Extraversion and Leadership Emergence: A Social Network Churn Perspective

One of the classic relationships in personality psychology is that extraversion is associated with emerging as an informal leader. However, recent findings raise questions about the longevity of extraverted individuals as emergent leaders. Here, we adopt a social network churn perspective to study the number of people entering, remaining in, and leaving the leadership networks of individuals over time. We propose that extraverted individuals endure as emergent leaders in networks over time, but experience significant changes in the people being led, including the loss of people who once considered them a leader but now no longer do. In Study 1 (N = 545), extraverted individuals had a larger number of new and remaining people in their leadership networks, but also lost more people, above and beyond differences in initial leadership network size. In Study 2 (N = 764), we replicated and extended these results in an organizational sample while controlling for alternative explanations such as formal rank, network size, self-monitoring, and narcissism. Extraversion predicted the number of people entering, remaining in, and leaving leadership networks over time. Our findings suggest that while extraverted individuals tend to emerge as leaders, they are also more likely to experience greater network churn—they tend to lead different people over time and leave people in their wake who once perceived them a leader but now no longer do. We discuss the challenges posed by this network churn perspective for extraverted emergent leaders and highlight its importance for our understanding of extraversion and emergent leadership