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91.
The skew angle causes a discrepancy in determining the reader-to-writer offset (RWO) when using different periodical patterns in track profile tests. It also separates the peak overwrite (OW) from the peak high frequency amplitude HFA, (1 T periodical pattern) on corresponding track profiles. Furthermore, higher track density and larger skew angle exacerbate the skew effect and induce more RWO error, thus impacting the parametric performance optimization. Simulation studies are used to interpret the skew effect on the RWO determination and OW cross-track characteristics. Based on experimental investigations and simulation analyses, using the HFA, track profile for deriving the optimal RWO is proposed for spin-stand tests. Actual parametric characterization has proven that the optimal RWO minimized the skew effect and the RWO error, thus improving the parametric performance and reducing the test variation. The method is beneficial and necessary for the high track density characterization. 相似文献
92.
Nebebech Belai Michael H. Dickman Michael T. Pope 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(7):802-803
The title salt, K[Co(C2H8N2)(CO3)2]·H2O, consists of a distorted octahedral cobalt complex anion and a seven‐coordinate potassium cation. Both metal atoms have crystallographic twofold symmetry, one C2 axis passing through the Co atom and C—C bond, and another along a short K—O (water) bond of 2.600 Å (corrected for libration). The carbonate is bidentate to both cobalt and potassium and the water forms a hydrogen bond to a carbonate O atom. 相似文献
93.
Monte Carlo optimization 总被引:2,自引:0,他引:2
Monte Carlo optimization techniques for solving mathematical programming problems have been the focus of some debate. This note reviews the debate and puts these stochastic methods in their proper perspective. 相似文献
94.
Dickman AG Grandi BC Figueiredo W Dickman R 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》1999,59(6):6361-6369
We derive a pair approximation (PA) for the NO+CO model with instantaneous reactions. For both the triangular and square lattices, the PA, derived here using a simpler approach, yields a phase diagram with an active state for CO-fractions y in the interval y(1)相似文献
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TMTD-vulcanised natural rubber cylinders (diameter = height = 20 mm) were compressed to 20%. Sinusoidal strains of 2·5, 5 and 10%, respectively, were superimposed on the static compression and the decrease of the maximum and minimum values of the stress recorded. A large difference between the curves representing the maximum and minimum values was obtained. This difference increased with increasing dynamic amplitude. The maximum values showed no dependence on the amplitude and the curves asymptotically reached the same relaxation value at long ageing times. The difference between the maximum and minimum values increased with increasing temperature. 相似文献
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Dickman MJ 《Journal of chromatography. A》2005,1076(1-2):83-89
Ion pair reverse phase high performance liquid chromatography on non-porous alkylated poly(styrene-divinylbenzene) particles enables the high resolution separation of double stranded DNA fragments. To further understand the separation mechanisms involved in ion pair reverse phase liquid chromatography we have analysed the effects of curved or "bent" DNA fragments with respect to their separation using both gel electrophoresis and ion pair reverse phase liquid chromatography. Size dependent separations of curved DNA fragments that migrate anomalously during gel electrophoresis were observed using ion pair reverse phase liquid chromatography. To further study the sequence effect and resulting changes in hydrophobicity of the duplex DNA, PCR fragments were generated that contain uracil in place of thymine. The resulting fragments were shown to elute with shorter retention times, demonstrating that sequence-specific effects can alter the retention of duplex DNA. The study was extended to the investigation of non-canonical B-DNA structures (Holliday junctions) under various chromatographic conditions, demonstrating that the coaxial stacking of the helices in such structures, in the presence of magnesium causes a change in retention. 相似文献