Plasma sprayed titanium coatings with/without a shroud

Abstract: Titanium coatings were deposited by plasma spraying with and without a shroud. The titanium coatings were then assessed by scanning electron microscopy. A comparison in microstructure between titanium coatings with and without the shroud was carried out. The results showed that the shroud played an important role in protecting the titanium particles from oxidation. The presence of the shroud led to a reduction in coating porosity. The reduction in air entrainment with t he shroud resulted in better heating of the particles, and an enhanced microstructure with lower porosity in the shrouded titanium coatings were observed compared to the air plasma sprayed counterpart

“Follow Me So I Can DM You Back”: An Exploratory Analysis of a Female Pro- ISIS Twitter Network

The purpose of this study is to explore a network of female pro-Islamic State of Syria and Iraq (ISIS) supporters on Twitter. To do so, I identified twenty Twitter accounts (n=20) through snowball sampling, and analyzed their network comprising 5,861 vertices and 12,034 edges. I studied the network using three social network analysis metrics—Freeman’s normalized betweenness centrality, average geodesic distance, and tie strength. Females in the sample were more influential than males, and as a result, had a greater ability to radicalize other females within their network. Further, I observed that it took females longer than expected to send information within the network, according to the Three Degrees of Influence Theory. Finally, I found that most ties within the network were not reciprocated. In line with the Strength of Weak Ties Theory, Pro-ISIS females have a unique ability to radicalize others to support pro-jihadist terrorism on Twitter. I conclude that despite the long average geodesic distance, certain pro-ISIS females can successfully encourage other women to radicalize. Public safety officials, Twitter, and other researchers must respond to this phenomenon accordingly

Organization and evolution of the UK far-right network on Telegram

The instant messaging platform Telegram has become popular among the far-right movements in the US and UK in recent years. These groups use public Telegram channels and group chats to disseminate hate speech, disinformation, and conspiracy theories. Recent works revealed that the far-right Telegram network structure is decentralized and formed of several communities divided mostly along ideological and national lines. Here, we investigated the UK far-right network on Telegram and are interested in understanding the different roles of different channels and their influence relations. We apply a community detection method, based on the clustering of a flow of random walkers, that allows us to uncover the organization of the Telegram network in communities with different roles. We find three types of communities: (1) upstream communities contain mostly group chats that comment on content from channels in the rest of the network; (2) core communities contain broadcast channels tightly connected to each other and can be seen as forming echo chambers; (3) downstream communities contain popular channels that are highly referenced by other channels. We find that the network is composed of two main sub-networks: one containing mainly channels related to the English-speaking far-right movements and one with channels in Russian. We analyze the dynamics of the different communities and the most shared external links in the different types of communities over a period going from 2015 to 2020. We find that different types of communities have different dynamics and share links to different types of websites. We finish by discussing several directions for further work

SciTech News Volume 71, No. 2 (2017)

Columns and Reports From the Editor 3 Division News Science-Technology Division 5 Chemistry Division 8 Engineering Division 9 Aerospace Section of the Engineering Division 12 Architecture, Building Engineering, Construction and Design Section of the Engineering Division 14 Reviews Sci-Tech Book News Reviews 16 Advertisements IEEE

Saudi universities rapid escalation in academic ranking systems: implications and challenges

High scientific output has made two Saudi universities perform well in academic ranking systems. The improvement in university ranking is generally observed in other indicators such as the innovation index, the abundance of cutting-edge research, and the number and success of patents and startups. In this paper, the impact of research output of highly cited researchers at two Saudi public universities is investigated from different standpoints and compared with international examples. Many citation databases, ranking systems and international indicators have been used in this paper to thoroughly discuss the research and development landscape in Saudi Arabia. Saudi public universities have the greatest number of highly cited researchers who mostly have another international affiliation. The Saudi academic patent number has increased dramatically since 2014, with minimum improvement in the country’s innovation and startups performance. Many of the Saudi highly cited papers are scattered in the literature with neither a specific targeted field nor follow-up studies. The role of the Saudi universities in industrial collaboration, technology advancement and economic prosperity is less than expected considering the Saudi position on the international stage. Entrepreneurship, innovation and research commercialisation ought to be supported by more private and public initiatives. Transparency, critical thinking, and accountability are needed the most in Saudi academic institutes. Recommendations are given for improving the research culture and following the best practice