The supercuspidal representations of p-adic classical groups

Let G be a unitary, symplectic or special orthogonal group over a locally compact non-archimedean local field of odd residual characteristic. We construct many new supercuspidal representations of G, and Bushnell-Kutzko types for these representations. Moreover, we prove that every irreducible supercuspidal representation of G arises from our constructions.Comment: 55 pages -- minor changes from 1st version (mostly in sections 2.2, 4.2 and 6.2). To appear in Inventiones mathematicae, 2008 (DOI is not yet active as at 12 Nov 2007

Semisimple types for p -adic classical groups

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Non-abelian dynamics in first-order cosmological phase transitions

Bubble collisions in cosmological phase transitions are explored, taking the non-abelian character of the gauge fields into account. Both the QCD and electroweak phase transitions are considered. Numerical solutions of the field equations in several limits are presented.Comment: 8 pages, 2 figures. Contribution to the CosPA 2003 Cosmology and Particle Astrophysics Symposium. Typos correcte

A Routh-like algorithm in system identification and adaptive control

This paper introduces algorithms to be used for finding the Cauchy index of a transfer function and for solving the Diophantine equation. The algorithms are similar to the Routh-Hurwitz array in structure and are simple to implement. The first algorithm also provides a simple check for the presence of almost common factors between two polynomials, and so is useful as a computationally inexpensive alternative to the sylvester determinant. It also finds the almost common factor, and so is potentially useful as an alternative to [8] in implementing self-tuning regulators for nonminimum-phase systems [6]

Home visits: A new screening tool for frailty? A retrospective exploratory study.

BACKGROUND: In the United Kingdom, the new NHS contract for primary care mandates that practices use the Electronic Frailty Index (EFI) to screen for frailty and apply clinical judgment, based on knowledge of the patient, to decide whether they have a diagnosis of frailty. EFI has not yet been validated for this purpose. Many primary care clinicians would agree that although not formally investigated, there seems to be a strong association between being housebound or in institutional care and having a diagnosis of frailty. Although being housebound or in institutional care is not commonly coded in primary care computer record systems (IT), this cohort of patients do require home visits if they become unwell. Home visits are coded and it is simple to run a search on primary care IT to generate a list of older people who have received a home over given period. AIM: This study assessed whether being housebound and requiring home visits could form a new screening tool for frailty. DESIGN AND SETTING: Retrospective cohort study from 1/3/15 to 29/2/16. Primary care, South Devon. METHOD: Medical records of 154 patients over 65 years of age were evaluated. Patients were divided into two groups: a group (n = 82) that had received a home visit and a second group consisting of a randomized sample of patients (n = 72) with similar baseline characteristics who had not. Patient records were analyzed by two clinicians to determine whether a frailty syndrome was present. Researchers were blinded to each other's results. An arbitrator determined the frailty status on disagreement. RESULTS: Home visits have a sensitivity of 87.23% [95% confidence interval (CI): 74.35%-95.17%] and specificity of 61.68% (95% CI: 51.78%-70.92%). For frailty, Cohen's Kappa showed fair interobserver reliability. CONCLUSION: This study suggests that home visits are a good screen for frailty; the data are easy to retrieve from primary care IT and could be used as a valid screening tool to assist with identifying frailty in primary care

There’s Never Enough: A Taxonomy of Online Retail Scarcity Cues

E-commerce continues to change the landscape of modern retail. Consider for instance that the majority of consumers (81%) now begin the decision making process with online searches (Morrison, 2014). Not only are more people researching products online, but consumers are increasingly purchasing those products online as well. This past November, the United States experienced its biggest online shopping day in history (Peterson, 2017). A record $6.59 billion was spent shopping online during Cyber Monday, a figure that is up 17% from 2016 (Rubin, 2017). Of course, perceived scarcity fuels the thrill of the hunt contributing to these enormous expenditures. A number of different scarcity cues are regularly used online that may influence a consumer’s shopping experience. It is well established that scarcity increases consumers’ preference for desired products (Verhallen, 1982). Essentially, the more challenging it is to acquire a product, the more valuable it is perceived to be (Lynn, 1992). While scarcity has been well-explored in the context of brickand-mortar retailers (e.g., Parker and Lehmann, 2011; Aggarwal, Jun, and Huh, 2011; Gierl and Huettl, 2010) there are still considerable gaps to explore within the online environment. Strategies applied to traditional retail may not translate to the online environment. For example, Wu and Lee (2016) argue that specific attention be paid to scarcity in the online environment since technological advancements provide online retailers with unique challenges and opportunities over their brick-and-mortar counterparts. How does scarcity translate to the online environment? The research presented aims to understand how scarcity cues are used online. Specifically, this research investigates a sample of major online retailers in the United States to create a taxonomy of scarcity cues that influence online purchase. Our findings suggest that online retail scarcity can be categorized into three types—product-related cues (indicates a perceived limited quantity available), social cues (indicates that other consumers desire this product), and temporal cues (indicates a temporal limit on availability). Based on these findings, scarcity is a larger concept than has been previously conceptualized in the literature. E-retailers have more flexibility and greater freedom to communicate scarcity online and consumers may respond to different depictions of scarcity cues

Worker heterogeneity, new monopsony, and training

A worker's output depends not only on his/her own ability but also on that of colleagues, who can facilitate the performance of tasks that each individual cannot accomplish on his/her own. We show that this common-sense observation generates monopsony power and is sufficient to explain why employers might expend resources on training employees even when the training is of use to other firms. We show that training will take place in better-than-average or ‘good’ firms enjoying greater monopsony power, whereas ‘bad’ firms will have low-ability workers unlikely to receive much training

Influence of Social Media Posts on Service Performance

Purpose Much research regarding social media posts and relevancy has resulted in mixed findings. Furthermore, the mediating role of relevancy has not previously been examined. This paper aims to examine the correlating relationship between types of posts made by hotels and the resulting occupancy rates. Then, the mediating role of relevancy is examined and ways that posts can increase/decrease relevancy of the post to potential hotel users. Design/methodology/approach Within the context of the hotel industry, three studies were conducted – one including hotel occupancy data from a corporate chain – to examine the impact of social media posts on relevancy and intentions to stay at the hotel. Experimental studies were conducted to explain the results of the real-world hotel data. Findings The findings show that relevancy is an important mediator in linking social media posts to service performance. A locally (vs nationally) themed post can decrease both the relevancy of a post and the viewer’s intentions to stay at a hotel. This relationship, however, can be weakened if a picture is included with the post, as a visual may increase self-identification with a post. Originality/value These results have important theoretical and practical implications as social media managers attempt to find the best ways to communicate to their customers and followers. Specifically, there are lower and upper limits to how many times a hotel should be posting to social media. The data also show many hotels post about local events, such as school fundraisers or a job fair, that can be harmful to stay intentions, likely due to the irrelevant nature of local posts to customers who are likely to stay in a hotel. National posts are seen as more relevant and likely to increase stay intentions, and the inclusion of a picture can help local posts seem more relevant

Development of hierarchy and rank effects in weaned growing rabbits (oryctolagus cuniculus)

[EN] Aggression among growing rabbits reduces production efficiency, and negatively affects the animal s welfare. Understanding hierarchy development may improve its predictive value with regard to differential access to resources and fitness. This could in turn lead to measures to reduce aggression. This study quantifies the development of a hierarchy among small groups of same-age rabbits kept in high density. We describe the development of the hierarchy in four mixed-sex groups formed after weaning at four weeks of age. The relationships between rank and aggressiveness, weight, sex and wound count were examined. To balance possible genetic effects, each group contained four full sibling dyads (N=8) with the male and female coming from the same litter (total N=32). Each group was housed in a wire mesh cage of 0.72 m² and was observed at 4, 6, 8, 10 and 12 wk of age. All activities of focal individuals were scored and antagonistic interactions among all group members were sampled continuously. For rank order analysis, submissive behaviours shown after receiving aggression were used. Females were heavier than males (3.2 kg vs 3.0 kg: wk 12); this difference was statistically significant from the sixth week onwards. Two of the four groups developed significantly linear hierarchies from the age of ten and twelve weeks onwards, respectively. In these two groups, rank order did not correlate with body weight, sex or wound count. The group with the steepest hierarchy had the highest number of wounds. The results show that growing rabbits can form linear hierarchies by 10 weeks of age, but this tendency differs strongly among groups. The male and female rabbits did not form separate hierarchies, in contrast to their natural tendencies. This may be due to the high density, and may imply a lack of interaction freedom.Vervaecke, H.; De Bonte, L.; Maertens, L.; Tuyttens, F.; Stevens, J.; Lips, D. (2010). Development of hierarchy and rank effects in weaned growing rabbits (oryctolagus cuniculus). World Rabbit Science. 18(3). doi:10.4995/wrs.2010.822918