We have previously generated elongated Taylor double-helix flux-rope plasmas in the SSX MHD wind tunnel. These plasmas are remarkable in their rapid relaxation (about one Alfvén time) and their description by simple analytical Taylor force-free theory despite their high plasma β and high internal flow speeds. We report on the turbulent features observed in these plasmas including frequency spec...

The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Use of probabilistic techniques has been demonstrated to learn air data parameters from surface pressure measurements. Integration of numerical models with wind tunnel data and sequential experiment design of wind tunnel runs has been demonstrated in the calibration of a flush ...

Dual-Stack Lite is a solution to offer both IPv4 and IPv6 connectivity to customers that are addressed only with an IPv6 prefix. Dual-Stack Lite requires pre-configuration of the Dual-Stack Lite Address Family Transition Router (AFTR) tunnel information on the Basic Bridging BroadBand (B4) element. In many networks, the customer profile information may be stored in Authentication, Authorization...

We developed a setup that provides three independent optical access paths to the tunnel junction of an ultrahigh vacuum low temperature (4.2 K) scanning tunneling microscope (STM). Each path can be individually chosen to couple light in or out, or to image the tunnel junction. The design comprises in situ adjustable aspheric lenses to allow tip exchange. The heat input into the STM is negligibl...

Vertical tunnel field-effect transistors (TFETs) in which the gate field is aligned with the tunneling direction have been fabricated using a novel gate-recess process, resulting in record on-current. The tunnel junction consists of InAs/GaSb with a broken band alignment. The gate-recess process results in low drain contact and access resistances; together with the favorable broken gap heteroju...

A magnetic tunnel junction with a perpendicular magnetic easy-axis (p-MTJ) is a key device for spintronic non-volatile magnetoresistive random access memory (MRAM). Co-Fe-B alloy-based p-MTJs are being developed, although they have a large magnetisation and medium perpendicular magnetic anisotropy (PMA), which make it difficult to apply them to a future dense MRAM. Here, we demonstrate a p-MTJ ...

In this paper we discuss the issues of wireless mobile networks for intelligent transportation systems (ITS) and examine several available technologies. Furthermore, we propose a design of secure transparent mobile IP to provide broadband ITS services over wireless LAN that improves upon security, transparency and handoff of mobile IP. The proposed design adopts a tunnel-in-tunnel mechanism for...

Covert channels inside DNS allow evasion of networks which only provide a restricted access to the Internet. By encapsulating data inside DNS requests and replies exchanged with a server located outside the restricted network, several existing implementations provide either an IP over DNS tunnel, or a socket-like service (TCP over DNS). This paper contributes a detailed overview of the challeng...

Wired networks are prone to the same attacks as wireless ones, including sniffing, spoofing and Man-in-the-middle attacks (MITM). In this paper we show how wireless networks are particularly vulnerable to a simple MITM that can make even rudimentary web surfing dangerous. We describe how we performed the attack and its ramifications. We argue why it is essential to have a VPN tunnel from the cl...