Shock Wave Effects on the Laminar Skin Friction of an Insulated Flat Plate at Hypersonic Speeds

An approximate theory on the phenomena of interaction between the shock wave and the laminar boundary layer on an insulated flat plate at hypersonic speeds has been formulated. Results on the rate of growth of the boundary layer thickness and the rate of decay of the shock wave strength have been found for M_1^(2(2+w)R_1^-1 = O(1). A new set of formulae for the average skin friction coefficient, C_F, over an insulated flat plate at hypersonic speeds has been obtained. Calculations on the basis of the new C_F formulae yield the data shown in Figs. 5 and 6. Contrary to the conventional theory which predicts a steady decrease in C_F as M_1 increases, the present results indicate that C_F may increase with M_1 at hypersonic Mach numbers

Personalization in social retargeting - A field experiment

This study compares the effectiveness of product- and category-specific advertising personalization in Social Retargeting. Social Retargeting combines the features of social advertising, targeting consumers based on social connections, and retargeting, using consumers' browsing behavior to personalize ad content. We conducted a large-scale randomized field experiment in collaboration with a major e-retailer. Contradicting prior empirical findings, our results indicate that product-specific ads outperform less personalized category-specific ads. While theory suggests a positive effect, we find that social targeting decreases the performance of personalized ads. Surprisingly, socially targeted consumers are not more responsive to product-specific ads. We show that our results remain robust and are driven by ad personalization when controlling for temporal targeting and how deep consumers browse the e-retailer's website. Our study contributes to the IS and marketing literature related to personalization in digital advertising and provides valuable suggestions for firms' personalization strategies

A Structured Framework and Resources to Use to Get Your Medical Education Work Published.

IntroductionMedical educators often have great ideas for medical education scholarship but have difficulty converting their educational abstract or project into a published manuscript.MethodsDuring this workshop, participants addressed common challenges in developing an educational manuscript. In small-group case scenarios, participants discovered the importance of the "So what?" in making the case for their project. Incorporating conceptual frameworks, participants chose appropriate outcome metrics, discussed how to frame the discussion section, and ensured appropriate journal fit. After each small-group exercise, large-group discussions allowed the small groups to report back so that facilitators could highlight and reinforce key learning points. At the conclusion of the workshop, participants left with a checklist for creating an educational manuscript and an additional resources document to assist them in avoiding common pitfalls when turning their educational abstract/project into a publishable manuscript.ResultsThis workshop was presented in 2016 and 2017. Presenter evaluations were completed by 33 participants; 11 completed conference evaluations. The mean overall rating on presenter evaluations was 4.55 out of 5, while the conference evaluations mean was 3.73 out of 4. Comments provided on both evaluation tools highlighted the perceived effectiveness of the delivery and content. More than 50% of respondents stated that they planned to incorporate the use of conceptual frameworks in future work.DiscussionThis workshop helped participants address common challenges by providing opportunities for hands-on practice as well as tips and resources for use when submitting a medical education manuscript for publication

Sustainable revenue management

The introduction of public transport smart cards means it is now possible to forecast how behavioural change stimulators, such as time-variable pricing, will impact passenger activity. This is an invaluable tool for managing revenue in a sustainable way, not just in the public transport sector, but also for every industry constrained by peak-loading capacity

Corporate twitter channels: The impact of engagement and informedness on corporate reputation

__Abstract__ This article examines firm communication on a corporate Twitter channel and its effects on corporate reputation. We identify the importance of user engagement and informedness in explaining corporate reputation, and examine three design factors that likely affect user engagement in a corporate Twitter channel. We conduct an exploratory 2 × 2 × 2 experiment among Twitter users to collect data. We find that the depth of the relationship among users, the level of corporate involvement, and the purpose of the channel interactively influence user engagement. Our findings suggest that deeper relationships among users of a corporate Twitter channel lead to higher user engagement when the level of corporate involvement with the channel is high and when the channel has a specific purpose, but not when the level of corporate involvement is high and the channel has a generic purpose. Surprisingly, when the channel has a generic purpose, a high degree of corporate involvement actually decreases user engagement. This finding implies that, under certain circumstances, a lower degree of corporate involvement in a social media channel may be more desirable. We also find that channel credibility positively influences user informedness. This is the first study that examines the dynamics of communication through a corporate Twitter channel. It contributes to the previous research related to social media by identifying engagement and informedness as two major factors that influence firms’ reputation. Our research can help marketing and social media managers to decide on channel design aspects such as whether to require users to register with an identity or to allow anonymous participation, whether to allocate dedicated employees to respond to user requests, and whether to set up different channels for different purposes

A Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties

We propose a simultaneous quantum secure direct communication scheme between one party and other three parties via four-particle GHZ states and swapping quantum entanglement. In the scheme, three spatially separated senders, Alice, Bob and Charlie, transmit their secret messages to a remote receiver Diana by performing a series local operations on their respective particles according to the quadripartite stipulation. From Alice, Bob, Charlie and Diana's Bell measurement results, Diana can infer the secret messages. If a perfect quantum channel is used, the secret messages are faithfully transmitted from Alice, Bob and Charlie to Diana via initially shared pairs of four-particle GHZ states without revealing any information to a potential eavesdropper. As there is no transmission of the qubits carrying the secret message in the public channel, it is completely secure for the direct secret communication. This scheme can be considered as a network of communication parties where each party wants to communicate secretly with a central party or server.Comment: 4 pages, no figur

Gold substrate-induced single-mode lasing of GaN nanowires

We demonstrate a method for mode-selection by coupling a GaN nanowire laser to an underlying gold substrate. Multimode lasing of GaN nanowires is converted to single-mode behavior following placement onto a gold film. A mode-dependent loss is generated by the absorbing substrate to suppress multiple transverse-mode operation with a concomitant increase in lasing threshold of only ∼13%. This method provides greater flexibility in realizing practical single-mode nanowire lasers and offers insight into the design of metal-contacted nanoscale optoelectronics