Slicing of silicon into sheet material. Silicon sheet growth development for the large area silicon sheet task of the low cost silicon solar array project

Fabrication of a prototype large capacity multiple blade slurry saw is considered. Design of the bladehead which will tension up to 1000 blades, and cut a 45 cm long silicon ingot as large as 12 cm in diameter is given. The large blade tensioning force of 270,000 kg is applied through two bolts acting on a pair of scissor toggles, significantly reducing operator set-up time. Tests with an upside-down cutting technique resulted in 100% wafering yields and the highest wafer accuracy yet experienced with MS slicing. Variations in oil and abrasives resulted only in degraded slicing results. A technique of continuous abrasive slurry separation to remove silicon debris is described

2001 NFLRC summer Institute evaluation: Web-based workshops for advanced reading & writing development & maintenance

NW26Evaluation of the 2001 NFLRC Summer Institute, Web-Based Workshops for Advanced Reading & Writing Development & Maintenance

Classical Kloosterman sums: representation theory, magic squares, and Ramanujan multigraphs

We study the representation theory of a certain finite group for which Kloosterman sums appear as character values. This leads us to consider a concrete family of commuting hermitian matrices which have Kloosterman sums as eigenvalues. These matrices satisfy a number of "magical" combinatorial properties and they encode various arithmetic properties of Kloosterman sums. These matrices can also be regarded as adjacency matrices for multigraphs which display Ramanujan-like behavior.Comment: 20 page

Metamodelling of multivariable engine models for real-time flight simulation.

Sophisticated real-time distributed flight simulation environments may be constructed from a wide range of modelling and simulation tools. In this way accuracy, detail and model flexibility may be incorporated into the simulator. Distributed components may be constructed by a wide range of methods, from high level environments such as Matlab, through coded environments such as C or Fortran to hardware-in-the- loop. In this paper the Response Surface Methodology is combined with a hyper-heuristic (evolutionary algorithm) and applied to the representation of computationally intensive non-linear multivariable engine modelling. The paper investigates the potential for metamodelling (models of models) dynamic models which were previously too slow to be included in multi-component, high resolution real-time simulation environments. A multi-dimensional gas turbine model with five primary control inputs, six environmental inputs and eleven outputs is considered. An investigation has been conducted to ascertain to what extent these systems can be approximated by response surfaces with experiments which have been designed by hyper-heuristics as a first step towards automatic modelling methodology

Leviathan on trial: Should states be held criminally responsible?

AbstractMany political theorists, philosophers, and International Relations scholars argue that states are ‘corporate moral agents’, which can be held responsible in many of the same ways as individual moral agents. States can have debts, contractual obligations, reparative obligations, and duties. Should states also be subject to criminal responsibility and punishment? Thus far, the debate about state crime has focused on two general problems with corporate crime: whether corporate entities can have intentions (or mens rea); and whether it is possible to punish them. In this paper, I identify two problems with extending corporate criminal responsibility to the state. First, since there is no ‘international corporate law’ that regulates the internal structures of states, many states fail to meet the conditions for corporate agency (and hence for criminal responsibility). Second, since the most serious international crimes are not subject to a statute of limitations, the argument for state crime paves the way for forms of ‘historical punishment’ that few of its proponents would accept. Finally, I argue that it is unnecessary to hold states criminally responsible, and that state responsibility ought to be understood as reparative rather than punitive.Non

An analytical approach to integral resonant control of second-order systems

Peer reviewedPostprin

Statistical Properties of Interacting Bose Gases in Quasi-2D Harmonic Traps

The analytical probability distribution of the quasi-2D (and purely 2D) ideal and interacting Bose gas are investigated by using a canonical ensemble approach. Using the analytical probability distribution of the condensate, the statistical properties such as the mean occupation number and particle number fluctuations of the condensate are calculated. Researches show that there is a continuous crossover of the statistical properties from a quasi-2D to a purely 2D ideal or interacting gases. Different from the case of a 3D Bose gas, the interaction between atoms changes in a deep way the nature of the particle number fluctuations.Comment: RevTex, 10pages, 4 figures, E-mail: [email protected]