1,412,283 research outputs found
Systematic study of effect of cross-drafts and nozzle diameter on shield gas coverage
No full textA shield gas flow rate of 15–20 L min21 is typically specified in metal inert gas welding, but is often adjusted to as high as 36 L min21 by welders in practice. Not only is this overuse of shield gas wasteful, but uncontrolled high gas flows can lead to significant turbulence induced porosity in the final weld. There is therefore a need to understand and control the minimum shield gas flow rate used in practical welding where cross-drafts may affect the coverage. Very low gas coverage or no shielding leads to porosity and spatter development in the weld region. A systematic study is reported of the weld quality achieved for a range of shield gas flow rates, cross-draft speeds and nozzle diameters using optical visualisation and numerical modelling to determine the shield gas coverage. As a consequence of the study, the shield gas flow has been reduced to 12 L min21 in production welding, representing a significant process cost saving and reduced environmental impact with no compromise to the final weld quality
Did Blue Cross and Blue Shield Suffer from Adverse Selection? Evidence from the 1950s
No full textThis paper uses a unique data set from 1957 to examine whether or not Blue Cross and Blue Shield suffered from an adverse selection death spiral after for-profit commercial insurance companies entered the market for health insurance. Results suggest that moving to experience rating may have helped the Blues counteract adverse selection in the group health insurance market. Adverse selection posed a greater problem for the Blues in the market for individual health insurance, possibly because of differences in the way the Blues screened potential enrollees relative to commercial insurance companies.
When is a shield not a shield? Interpreting Indigenous versatility in an East End match factory
No full textA wooden shield, made by a once-known Aboriginal person in Western Australia around the beginning of the twentieth century, sits in the Science Museum’s London stores. This paper focuses on its life in an East London match factory from about 1928 until 1937, when it was transferred to the Science Museum. The shield stands out among its Aboriginal counterparts now held by museums because curators at the Bryant and May Museum of Fire-Making Appliances (and subsequently at the Science Museum) did not prioritise its links with conflict or ceremony, nor the skill with which it was carved. Instead, unprepossessing marks on its back captured their attention. These saw-marks showed that this was not ‘just’ a shield: it had sometimes been used to make fire. Valued now as an example of global fire-equipment, it was subsumed into an English collection of fire making technologies. By tracing the shield’s early museum life, this paper considers how and why European collecting cultures have marshalled indigenous objects to promote narratives of supposed ‘progress’
GLUCO SHIELD PRO
No full textAs others have stated, it isn't safe to assume they hate Gluco Shield Pro. I wish to spout something that provides a detailed explanation relative to Gluco Shield Pro. I don't need to make waves. My notion is based around my assumption that nobody has an idiosyncrasy about Gluco Shield Pro. It is clear to me this I cannot keep clear of it, at least partially. Actually, that is a generic Gluco Shield Pro that has a good bit of hype surrounding it. Alright, "Cleanliness is next to Godliness." You say Gluco Shield Pro, I say Gluco Shield Pro. Gluco Shield Pro is not one of the strategies I've mastered. We will resume with my engaging and witty ideas concerning Gluco Shield Pro
SHIELD: A Novel NFV-based Cybersecurity Framework
No full textSHIELD is an EU-funded project, targeting at the design and development of a novel cybersecurity framework, which offers security-as-a-Service in an evolved telco environment. The SHIELD framework leverages NFV (Network Functions Virtualization) and SDN (Software-Defined Networking) for virtualization and dynamic placement of virtualised security appliances in the network (virtual Network Security Functions – vNSFs), Big Data analytics for real-time incident detection and mitigation, as well as attestation techniques for securing both the infrastructure and the services. This papers discusses key use cases and requirements for the SHIELD framework and presents a high-level architectural approach
The SHIELD approach
No full textWith a business baseline focused on the impact of embedded systems in the years ahead, the book investigates the Security, Privacy and Dependability (SPD) requirements raised from existing and future IoT, Cyber-Physical and M2M systems. It proposes a new approach to embedded systems SPD, the SHIELD philosophy, that relies on an overlay approach to SPD, on a methodology for composable SPD, on the use of semantics, and on the design of embedded systems with built-in SPD. The book explores new ground and illustrates the development of approximately forty prototypes capable of managing and enhancing SPD, including secure boot, trusted execution environments, adaptable radio interfaces, and different implementations of the middleware for measuring and composing SPD
High-temperature Heat Shield Assembly
No full textA heat shield bladder includes first and second sheets of insulating material that form a bladder between the first and second sheets. At least one reflective foil is disposed within the bladder and a plurality of spacers are disposed within the bladder and positioned to space the at least one reflective foil from the first and second sheets of insulating material. Multiple reflective foils may be disposed within the bladder with spacers between each reflective foil. The heat shield bladder may be rolled into a tube shaped and used inside a pipe or formed into panels that may be used to line a vessel.U
SHIELD technology demonstrators
No full textSHIELD technology demonstrators have been conceived to illustrate the functionalities of specific security, privacy, and dependability (SPD) technologies that, being domain independent, might be adopted in several application scenarios. The selected technologies have been introduced in Chapter 3, while this chapter provides more detailed information on their usage from a wider perspective. SHIELD technology demonstrators consist of laboratory prototypes and experiments that allow to test and evaluate all the functionalities offered by a SPD technology, rather than focusing on the specific functionality subset used in the domains presented in the previous chapters
High-temperature heat shield assembly
No full textA heat shield bladder includes first and second sheets of insulating material that form a bladder between the first and second sheets. At least one reflective foil is disposed within the bladder and a plurality of spacers are disposed within the bladder and positioned to space the at least one reflective foil from the first and second sheets of insulating material. Multiple reflective foils may be disposed within the bladder with spacers between each reflective foil. The heat shield bladder may be rolled into a tube shaped and used inside a pipe or formed into panels that may be used to line a vessel.U
Modeling a TRIGA Mark II Biological Shield using MCNP5
No full textThe 250kW TRIGA Mark II research reactor, Vienna, is equipped with experimental
facilities inside and outside the reactor core. Outside the core, there are four beam tubes (three
radial and one tangential beam tube), a thermal column and a neutron radiography collimator,
supplying neutrons for irradiation experiments. These experiments include neutron radiography,
neutron tomography, neutron activation and academic training purposes. This paper describes
calculations of the neutron flux density in the thermal column and in one of the selected beam
tubes (i.e. BT-A), using the MCNP5 neutron transport code. To validate these calculations with
experiments, neutron flux measurements using the gold foil activation method were performed on
13 selected positions in the thermal column. After comparison between calculations and
measurements on thermal column, this paper also presents the thermal flux distribution in BT-A
calculated by MCNP5. For this task, the already developed MCNP model for the TRIGA core was
extended to the biological concrete shield including the four irradiation beam tubes and the above
mentioned irradiation facilities. To save computational costs and incorporate the accurate and
complete information for the individual MC particle tracks, the surface source writing
capability of MCNP was applied to the TRIGA shielding model. The variance reduction
techniques were also applied to improve the statistics of the problem and to save
computational efforts
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