Nano-structures at martensite macrotwin interfaces in Ni65Al35Ni_{65}Al_{35}

The atomic configurations at macrotwin interfaces between microtwinned martensite plates in $Ni_{65}Al_{35}$ material are investigated using transmission electron microscopy. The observed structures are interpreted in view of possible formation mechanisms for these interfaces. A distinction is made between cases in which the microtwins, originating from mutually perpendicular \{110\} austenite planes, enclose a final angle larger or smaller than $90^{\circ}$. Two different configurations, a crossing and a step type are described. Depending on the actual case, tapering, bending and tip splitting of the smaller microtwin variants are observed. The most reproducible deformations occur in a region of approximately 5-10nm width around the interface while a variety of structural defects are observed further away from the interface. These structures and deformations are interpreted in terms of the coalescence of two separately nucleated microtwinned martensite plates and the need to accommodate remaining stresses

Formulas establish audio range inductance in beryllium coils

Mathematical modeling is used to determine the effects of resistance and capacitance upon the audio-inductance range of beryllium hammer coils and beryllium nylon-potted coils

Research to determine cloud and synoptic parameters associated with clear air turbulence Interim report

Clear air turbulence in stratosphere and tropospher

Airborne particulate matter and diesel vehicles in cities - changing perspectives

The last half Century has seen a dramatic turnaround in attitudes to atmospheric particulate emissions including those from diesel-engined road vehicles. In the 1960s it was believed that diesel emissions, then referred to as 'smoke,' were no more than a nuisance in that they obscured visibility and / or appeared unsightly. In 2016 they are seen as contributing significantly to mortality risk in urban areas. This paper traces the evolution of thinking over that time period using London as a case study. It is apparent that there has at times, and for a variety of reasons, been resistance to new knowledge and a reluctance to move on, even though it was for the common good that that be done. Similar contests can be observed with respect to other hazards to which urban inhabitants are exposed

Tungsten thermal neutron dosimeter

Tungsten-185 activity, which is produced by neutron activation of tungsten-184, determines thermal neutron flux. Radiochemical separation methods and counting techniques for irradiated tungsten provide accurate determination of the radiation exposure

Utilising expertise to manage dynamic urban risks

Managing risk is usually multi-dimensional and frequently controversial, since a focus on one element may lead to outcomes that are unpopular with other stakeholders, who may have different agendas, objectives or motivations. This requires that judgements be made, which in many situations require expertise, which is hard won and specific. In some cases, however, the role of experts has been controversial, with other stakeholders challenging the basis on which decisions are made. In other instances management systems or standard operating procedures may hamper discretion. Effective risk management requires that the correct expertise is identified, recruited or developed and sufficiently supported by management practice, including training. It is important, but frequently challenging, to demonstrate that this is undertaken in a reasonable and defendable manner. The paper draws together a number of different concepts and evaluates their impact on the design of robust policy positions that may address the concerns that urban stakeholders may have in developing an appropriate and proportionate response to risks

A study of intense magnetic fields for high energy forming and structural assembly Interim report

Determination of maximum force on static sheet of aluminum subjected to magnetic field of hammer coi

Development of a valid mathematical formula or group of formulas to establish within an accuracy of 5 percent the inductance audio range resulting in beryllium coil assemblies Final report

Mathematical formulas to determine net inductance in audio range of both hammer coil and cryogenic sealing coi