Our hybrid history and its action points for today

Discusses the hybrid catalogue, highlighting that it has always been with us, and considers what can be learned from previous implementations of new international cataloguing standards in the Anglo-American tradition

Analysis and Control of the Synchronous Buck Converter with a Constant Power Load

This thesis examines the effects of loads with constant power characteristics on the operation of the synchronous buck converter. Loads with constant power characteristics occur when a regulated converter is used as a load, which is the case in power distribution architectures composed of power electronics converters rather than direct connection of sources, loads, or energy storage. In this thesis, the large signal behavior and control of a system comprised of an ideal synchronous buck converter feeding an ideal constant power load are examined. A polar coordinate model of the system is derived for use in the analysis of both the constant duty cycle and controlled duty cycle behavior of the system, and the unstable nature of the single equilibrium point and the global absence of convergence to any point or limit cycle for non-equilibrium initial conditions is proven mathematically for the constant duty cycle case. To stabilize the system, geometrical boundary control and PD control are examined. The analysis and design of the boundary controller in the polar coordinate representation is presented, and the region of convergence and local stabilization of the system under boundary control are verified using numerical simulation. The analysis and design of the PD controller is then presented using both small-signal techniques and geometrical insights from boundary control, and the region of convergence and local stabilization are verified using numerical simulation. Lastly, the addition of an integral component to the PD controller to compensate for operating point changes, control signal error, and parameter uncertainty is analyzed using small-signal techniques, and performance of the system under PID control is verified using numerical simulation. Throughout, simulation results from a switching model of a synchronous buck converter feeding a point of load buck converter are included to verify the performance of the control strategies in a more realistic circuit

<I>Robinson Crusoe</I>

Pantomime. Cast incl. Gladys Raines, Alice Bennetto, Elton Black, Yorke Gray, Percy Mackay, Lou Vernon, Sydney Jones, Leslie Jephcott, Belle Millette, Pauline Harford, Phil Kennedy, Olga Muir. M/S 1: Running order sheet. M/S 2: 5 copies (x2p) and 6 copies (x1p) of dialogue and lyrics to "Hurrah for the Rolling Sea" scene performed by Percy McKay and chorus. M/S 3: Character part: Humbug (2p), handwritten. M/S 4: Character part: Man Friday "A Faithful Nigger" (2p). M/S 5: Character part: Polly Perkins (4p) Typed text with hand-written notes for Gladys Raines. M/S 6: Character part: Robinson Crusoe (4p) Typed text with hand-written notes for Gladys Raines. M/S 7: Lyrics to several songs (2p). The only one identified to date is the opening chorus number to Act 1 "Fisher Girls"

Social media use, personality characteristics, and social isolation among young adults in the United States

Although increased social media use (SMU) has been linearly associated with increased real-life social isolation (SI), it is unknown whether these associations differ by personality characteristics. With a nationally-representative sample of 1,768 U.S. young adults aged 19–32, we assessed SI using a 4-item Patient-Reported Outcomes Measurement Information System scale, and personality using the 10-item Big Five Inventory. Using ordered logistic regression, we evaluated multivariable associations between SMU, personality characteristics, and SI. Extraversion and agreeableness were associated with lower odds of SI, while neuroticism was associated with higher odds. A significant interaction term demonstrated that the association between SMU and SI differed by conscientiousness. Among those with low conscientiousness, compared with the lowest quartile of SMU, those in the highest quartile had more than three times the odds (AOR=3.20, 95% CI=1.99, 5.15) for increased SI, but there was no significant association among the high conscientiousness group. Interaction terms between SMU and the other four personality characteristics were not significant. Conscientious individuals may approach social media in a way that helps maintain good face-to-face social interactions, reducing perceived SI

Autonomous Exploration for 3D Map Learning

Abstract. Autonomous exploration is a frequently addressed problem in the ro-botics community. This paper presents an approach to mobile robot exploration that takes into account that the robot acts in the three-dimensional space. Our approach can build compact three-dimensional models autonomously and is able to deal with negative obstacles such as abysms. It applies a decision-theoretic framework which considers the uncertainty in the map to evaluate potential ac-tions. Thereby, it trades off the cost of executing an action with the expected information gain taking into account possible sensor measurements. We present experimental results obtained with a real robot and in simulation.

Major ampullate silk gland transcriptomes and fibre proteomes of the golden orb-weavers, Nephila plumipes and Nephila pilipes (Araneae: Nephilidae)

Natural spider silk is one of the world’s toughest proteinaceous materials, yet a truly biomimetic spider silk is elusive even after several decades of intense focus. In this study, Next-Generation Sequencing was utilised to produce transcriptomes of the major ampullate gland of two Australian golden orb-weavers, Nephila plumipes and Nephila pilipes, in order to identify highly expressed predicted proteins that may co-factor in the construction of the final polymer. Furthermore, proteomics was performed by liquid chromatography tandem-mass spectroscopy to analyse the natural solid silk fibre of each species to confirm highly expressed predicted proteins within the silk gland are present in the final silk product. We assembled the silk gland transcriptomes of N. plumipes and N. pilipes into 69,812 and 70,123 contigs, respectively. Gene expression analysis revealed that silk gene sequences were among the most highly expressed and we were able to procure silk sequences from both species in excess of 1,300 amino acids. However, some of the genes with the highest expression values were not able to be identified from our proteomic analysis. Proteome analysis of “reeled” silk fibres of N. plumipes and N. pilipes revealed 29 and 18 proteins, respectively, most of which were identified as silk fibre proteins. This study is the first silk gland specific transcriptome and proteome analysis for these species and will assist in the future development of a biomimetic spider silk

Social Media Use and Perceived Social Isolation Among Young Adults in the U.S.

Introduction: Perceived social isolation (PSI) is associated with substantial morbidity and mortality. Social media platforms, commonly used by young adults, may offer an opportunity to ameliorate social isolation. This study assessed associations between social media use (SMU) and PSI among U.S. young adults. Methods: Participants were a nationally representative sample of 1787 U.S. adults aged 19–32 years. They were recruited in October–November 2014 for a cross-sectional survey using a sampling frame that represented 97% of the U.S. population. SMU was assessed using both time and frequency of using 11 social media platforms, including Facebook, Twitter, Google+, YouTube, LinkedIn, Instagram, Pinterest, Tumblr, Vine, Snapchat, and Reddit. PSI was measured using the Patient-Reported Outcomes Measurement Information System scale. In 2015, ordered logistic regression was used to assess associations between SMU and SI while controlling for eight covariates. Results: In fully adjusted multivariable models that included survey weights, compared with those in the lowest quartile for SMU time, participants in the highest quartile had twice the odds of having greater PSI (AOR=2.0, 95% CI=1.4, 2.8). Similarly, compared with those in the lowest quartile, those in the highest quartile of SMU frequency had more than three times the odds of having greater PSI (AOR=3.4, 95% CI=2.3, 5.1). Associations were linear (p<0.001 for all), and results were robust to all sensitivity analyses. Conclusions: Young adults with high SMU seem to feel more socially isolated than their counterparts with lower SMU. Future research should focus on determining directionality and elucidating reasons for these associations