The design of a numerically controlled drilling system using fluidic elements 1966/7

This report outlines the aims of the project and procedures used to bring it to a successful conclusion. It also summarises the results of an investigation into the parameters which govern the specification of a numerically controlled point to point drilling machine

Towards mechanomagnetics in elastic crystals: insights from [Cu(acac)2_2]

We predict that the magnetic properties of \cuacac, an elastically flexible crystal, change dramatically when the crystal is bent. We find that unbent \cuacac\ is an almost perfect Tomonaga-Luttinger liquid. Broken-symmetry density functional calculations reveal that the magnetic exchange interactions along the chains is an order of magnitude larger than the interchain exchange. The geometrically frustrated interchain interactions cannot magnetically order the material at any experimentally accessible temperature. The ordering temperature ($T_N$), calculated from the chain random phase approximation, increases by approximately 24 orders of magnitude when the material is bent. We demonstrate that geometric frustration both suppresses $T_N$ and enhances the sensitivity of $T_N$ to bending. In \cuacac, $T_N$ is extremely sensitive to bending, but remains too low for practical applications, even when bent. Partially frustrated materials could achieve the balance of high $T_N$ and good sensitivity to bending required for practical applications of mechanomagnetic elastic crystals

Letter from C. E. Powell to Ellett

Finding aid for the Citizens\u27 Council Collection: http://purl.oclc.org/umarchives/MUM00072/ Images in this collection are for personal use only. These items may not be reproduced, re-posted or saved except under fair use, as stipulated by U.S. Copyright Law : reproduction is not to be used for any purpose other than private study, scholarship, or research

Letter from C. E. Powell to Ellett

Finding aid for the Citizens\u27 Council Collection: http://purl.oclc.org/umarchives/MUM00072/ Images in this collection are for personal use only. These items may not be reproduced, re-posted or saved except under fair use, as stipulated by U.S. Copyright Law : reproduction is not to be used for any purpose other than private study, scholarship, or research

Letter from C. E. Powell to Ellett

Finding aid for the Citizens\u27 Council Collection: http://purl.oclc.org/umarchives/MUM00072/ Images in this collection are for personal use only. These items may not be reproduced, re-posted or saved except under fair use, as stipulated by U.S. Copyright Law : reproduction is not to be used for any purpose other than private study, scholarship, or research

Letter from C. E. Powell to Ellett

Finding aid for the Citizens\u27 Council Collection: http://purl.oclc.org/umarchives/MUM00072/ Images in this collection are for personal use only. These items may not be reproduced, re-posted or saved except under fair use, as stipulated by U.S. Copyright Law : reproduction is not to be used for any purpose other than private study, scholarship, or research

Dynamic conversion of solar generated heat to electricity

The effort undertaken during this program led to the selection of the water-superheated steam (850 psig/900 F) crescent central receiver as the preferred concept from among 11 candidate systems across the technological spectrum of the dynamic conversion of solar generated heat to electricity. The solar power plant designs were investigated in the range of plant capacities from 100 to 1000 Mw(e). The investigations considered the impacts of plant size, collector design, feed-water temperature ratio, heat rejection equipment, ground cover, and location on solar power technical and economic feasibility. For the distributed receiver systems, the optimization studies showed that plant capacities less than 100 Mw(e) may be best. Although the size of central receiver concepts was not parametrically investigated, all indications are that the optimal plant capacity for central receiver systems will be in the range from 50 to 200 Mw(e). Solar thermal power plant site selection criteria and methodology were also established and used to evaluate potentially suitable sites. The result of this effort was to identify a site south of Inyokern, California, as typically suitable for a solar thermal power plant. The criteria used in the selection process included insolation and climatological characteristics, topography, and seismic history as well as water availability

Smooth double barriers in quantum mechanics

Quantum mechanical tunneling across smooth double barrier potentials modeled using Gaussian functions, is analyzed numerically and by using the WKB approximation. The transmission probability, resonances as a function of incident particle energy, and their dependence on the barrier parameters are obtained for various cases. We also discuss the tunneling time, for which we obtain generalizations of the known results for rectangular barriers.Comment: 23 pages, 8 figures, a slightly reduced version to appear in American Journal of Physics, references correcte

Automatic assembly design project 1968/9: report of technical survey committee

An Industrial survey has been carried out to determine the desired features of an automatic as machine. A questionnaire was circulated to industry and the results of the 38% response obtained were analysed and plotted. From these, conclusions were drawn as to the industrial requirements of an assembly machine

A phenomenological model of the superconducting state of the Bechgaard salts

We present a group theoretical analysis of the superconducting state of the Bechgaard salts, e.g., (TMTSF)_2PF_6 or (TMTSF)_2ClO_6. We show that there are eight symmetry distinct superconducting states. Of these only the (fully gapped, even frequency, p-wave, triplet) 'polar state' is consistent with the full range of the experiments on the Bechgaard salts. The gap of the polar state is d(k) (psi_uk,0,0), where psi_uk may be any odd parity function that is translationally invariant.Comment: 4 pages, no figure