Advanced thermoplastic resins, phase 2

High temperature structural resins are required for use on advanced aerospace vehicles as adhesives and composite matrices. NASA-Langley developed polyimide resins were evaluated as high temperature structural adhesives for metal to metal bonding and as composite matrices. Adhesive tapes were prepared on glass scrim fabric from solutions of polyamide acids of the semicrystalline polyimide LARC-CPI, developed at the NASA-Langley Research Center. Using 6Al-4V titanium adherends, high lap shear bond strengths were obtained at ambient temperature (45.2 MPa, 6550 psi) and acceptable strengths were obtained at elevated temperature (14.0 MPa, 2030 psi) using the Pasa-Jell 107 conversion coating on the titanium and a bonding pressure of 1.38 MPa (200 psi). Average zero degree composite tensile and compressive strengths of 1290 MPa (187 ksi) and 883 MPa (128 ksi) respectively were obtained at ambient temperature with unsized AS-4 carbon fiber reinforcement

Efficient and Generalized Decentralized Monitoring of Regular Languages

Part 2: Monitoring and TestingInternational audienceThis paper proposes an efficient and generalized decentralized monitoring algorithm allowing to detect satisfaction or violation of any regular specification by local monitors alone in a system without central observation point. Our algorithm does not assume any form of synchronization between system events and communication of monitors, uses state machines as underlying mechanism for efficiency, and tries to keep the number and size of messages exchanged between monitors to a minimum. We provide a full implementation of the algorithm with an open-source benchmark to evaluate its efficiency in terms of number, size of exchanged messages, and delay induced by communication between monitors. Experimental results demonstrate the effectiveness of our algorithm which outperforms the previous most general one along several (new) monitoring metrics

The Strength of Social Bonds in Preventing at Risk Youth from Engaging in Delinquent and Law Violating Behavior

The purpose of the study is to assess whether social bonds (i.e., attachment, commitment, involvement, and belief) are associated with a decrease in delinquent and law violating behavior among at-risk youth in various geographical locations. According to Travis Hirschi\u27s (1969) social bonding theory, delinquent acts occur when an individual\u27s bond to society is weak or broken. Hirschi stated that humans by nature are deviant, and that the value individuals place on their relationships prevent them from engaging in such behavior. Using data from the 2000 ICPSR Evaluation of the Children at Risk Program in Austin, Texas; Bridgeport, Connecticut; Memphis, Tennessee; Savanah, Georgia; and Seattle, Washington (1993-1997), the four research questions addressed in this study are: Which social bonds in early adolescence are associated with a decrease in the use of marijuana or hash in later adolescence?, which social bonds in early adolescence are associated with a decrease in alcohol consumption in later adolescence?, which social bonds in early adolescence are associated with a decrease in dealing drugs in later adolescence?, and which social bonds in early adolescence are associated with a decrease in arrest in later adolescence? Overall, the results from the bivariate and multivariate analysis showed moderate support for social bonding theory

2021 Graduate Program Rankings for UNLV & UNR

This Fact Sheet presents the 2021 U.S. News and World Report graduate program rankings for the University of Nevada, Las Vegas (UNLV) and the University of Nevada, Reno (UNR). The rankings for 2021 are important when taking into consideration that both UNLV and UNR achieved Carnegie R1 status in 2018. This status marks their place in the top 130 research universities in the country

The role of Industry 4.0 enabling technologies for safety management: A systematic literature review

Innovations introduced during the Industry 4.0 era consist in the integration of the so called "nine pillars of technologies" in manufacturing, transforming the conventional factory in a smart factory. The aim of this study is to investigate enabling technologies of Industry 4.0, focusing on technologies that have a greater impact on safety management. Main characteristics of such technologies will be identified and described according to their use in an industrial environment. In order to do this, we chose a systematic literature review (SLR) to answer the research question in a comprehensively way. Results show that articles can be grouped according to different criteria. Moreover, we found that Industry 4.0 can increase safety levels in warehouse and logistic, as well as several solutions are available for building sector

Leptogenesis and Low-energy Observables

We relate leptogenesis in a class of theories to low-energy experimental observables: quark and lepton masses and mixings. With reasonable assumptions motivated by grand unification, one can show that the CP-asymmetry parameter takes a universal form. Furthermore the dilution mass is related to the light neutrino masses. Overall, these models offer a natural explanation for a lepton asymmetry in the early universe.Comment: 10 pages, revised discussion on light neutrino masse