- Bootntr troubleshooting pcalc serial#
- Bootntr troubleshooting pcalc full#
- Bootntr troubleshooting pcalc trial#
- Bootntr troubleshooting pcalc series#
These experiments show that tunnel diode systems using power amplifiers of high directivity and without reflection to the input can be built. An input/output impedance ratio of better than two with a voltage gain approaching one up to 1 kmc was achieved. The performance of the T-line system was studied with several 5 ma tunnel-diodes. Tenative mechanisms were advanced to explain the observed I/sub c/ = /sub m/I/sub E/ + MI/sub co/ relation.
Collector characteristics were examined by using very short pulses to eliminate thermal runaway. Investigation of the experimental and theoretical aspects of the avalanche breakdown of transistors was initiated.
For the ILLIAC II system, a doubleprecision decimal read routine for Pass 1 more » of the assembler was written a subroutine for calculating log/sub 10/x, log/sub e/x, and log/sub 2/x was written, four library programs for the card operating system were checked out, the three basic passes of the card assembler were completed and checked, and all four tape units for the 1401 processing system were put into operation.
Bootntr troubleshooting pcalc serial#
Work on the high-speed computer program involved component testing, construction and use of a switching time test rig for evaluation of 2N1072's and possible replacement types, modification and testing of the magnetic drum serial 129, modification of driver circuits to overcome power system noise generation, modification to the +65-volt distribution system and the sensing transformer of the core memory (splitting the +65-volt supply into x-y and sense amplifier sections showed the sense amplifiers to be the most sensitive), and design of the cabling arrangement for the 1401. The second part of the thesis discusses three crystal structure determinations.
Bootntr troubleshooting pcalc full#
The starting model need not be very large to achieve success with PHASER successful phase refinement has been achieved with a starting model that consists of only 5% of the total scattering power of the full molecule. After convergence has been reached, more atomic positions and less extraneous peaks are observed in the refined electron density map.
Secondly, the authors assume that a better electron density map will result by using the observed magnitudes of the structure factors combined with the phases calculated in the reverse transform. A reverse Fourier transform is computed based on the modified electron density map. In practice a small positive cutoff is used. First, the starting electron density map is modified based on the fact that physically the electron density map must be non-negative at all points. Modifications are made to the reverse transform process based on several assumptions.
Bootntr troubleshooting pcalc trial#
The trial model, which serves as the starting point for the phase refinement, may be acquired by several routes such as direct methods or Patterson methods. It facilitates the refinement of such poorly phased electron density maps for difficult structures which might otherwise not be solvable.
Bootntr troubleshooting pcalc series#
PHASER is a series of FORTRAN programs which aids in the structure solution of poorly phased electron density maps by more » refining the crystallographic phases. A method for determination of crystal structures that have resisted solution through normal crystallographic methods has been developed. There may also be extraneous peaks present which are not due to atomic positions. In such cases, the phasing of the trial model is poor enough that the electron density map may show peaks in some of the atomic positions, but other atomic positions are not visible. Often a crystallographer obtains an electron density map which shows only part of the structure.
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