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1.
Summary The mass spectra of secondary ions emitted from PVK thin layers under 2 keV Xe+ bombardment were measured. The charasteristic elemental and molecular ions emitted were specified. The temperature dependence of the secondary emission was also measured. The results obtained were briefly discussed in terms of the ion beam-induced polymer structure fragmentation.Work supported by the research programme MR-I-5-8. 相似文献
2.
In the Fe–30Ni alloy investigated a martensitic transformation can occur both during quenching or plastic deformation. Martensite formed during plastic deformation, depending on the thermo-mechanical treatment applied, exhibits a different morphology from that achieved during quenching and forms the so-called composite-like structure. The morphology and volume fraction of martensite depends both on strain and temperature. In the present studies Fe–30Ni alloy was deformed by monotonic rolling in one path and perpendicular rolling in the temperature range MD–MS. The aim of the investigations was a determination of martensite volume fraction depending on the strain and temperature. To examine the influence of strain, the alloy was deformed by rolling in one path or perpendicular rolling at a temperature of − 30 °C, in the strain range of 10–30%. The dependence of temperature was investigated by rolling with 30% strain in a temperature range from − 30 °C to − 80 °C. The variants of thermo-mechanical treatment performed enabled us to achieve different martensite morphologies and volume fractions. Microstructural analysis was performed by means of light microscopy and transmission electron microscopy. The results of quantitative microstructural analysis of martensite and retained austenite volume fractions formed in different thermo-mechanical treatments were compared with those obtained by magnetic measurements. The fraction of deformation-induced martensite determined varied from 2% to 86%. The partial volume fractions VVMF of martensite formed in different deformation directions were also determined. It was found that the influence of the temperature on the martensite volume fraction is more pronounced than the influence of strain. 相似文献
3.
Holden Ronald R.; Wasylkiw Louise; Starzyk Katherine B.; Book Angela S.; Edwards Melanie J. 《Canadian Metallurgical Quarterly》2006,38(1):24
Four studies investigated the dimensionality of the NEO Five-Factor Inventory (NEO-FFI; P. T. Costa & R. R. McCrae, 1992). In Study 1, four inferential dimensions and four clusters represented the NEO-FFI when 114 undergraduates freely sorted items into categories. Construct validity for four item-clusters derived from the inferential space was obtained in Study 2 based on self-report with 304 undergraduates. Study 3 validated these inferential clusters using self and peer reports for 420 undergraduates. Study 4 validated the cluster scales for predicting quality of life and significant social and cultural behaviours for 110 undergraduates. Implications for implicit personality theory, the number of dimensions issue in personality, and test construction are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
Hennel F 《Magma (New York, N.Y.)》1999,9(3):134-137
A residual ghost artefact in echo-planar imaging (EPI) remains after the standard correction procedure based on a 1-dimensional
phase-modulation of the spectra of even or odd echoes. A better reduction of this artefact is demonstrated using a 2-dimensional
phase correction. The phase correction map is measured inside the ghost-free region of the image, preferably in a reference
scan with an increased field of view, as the phase difference between complex images reconstructed separately from even and
odd echoes. An extrapolated map consisting of spatial components up to the second order (constant,x, y, xy andx
2−y2) is then found by a fit to the measured values. This map is used to correct the phase of even- and odd-reconstructed images
before adding them. This procedure may cause some spatially dependent loss of signal, but if the level of the residual artefact
is less than 20% of the image intensity, such losses are negligible. 相似文献
5.
Kaya S. Hamed H.F.A. Starzyk J.A. 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2007,54(7):571-575
We illustrate unique examples of low-power tunable analog circuits built using independently driven nanoscale DG-MOSFETs, where the top gate response is altered by application of a control voltage on the bottom gate. In particular, we provide examples for a single-ended CMOS amplifier pair, a Schmitt trigger circuit and a operational transconductance amplifier C filter, circuit blocks essential for low-noise high-performance integrated circuits for analog and mixed-signal applications. The topologies and biasing schemes explored here show how the nanoscale DG-MOSFETs may be used for efficient, tolerant and smaller circuits with tunable characteristics. 相似文献
6.
Alan R. Katritzky Franciszek Saczewski Charles M. Marson 《Israel journal of chemistry》1986,27(1):111-116
Carbazoles react with a variety of one-carbon fragments at the 3- or 3,6-positions to give di- and trimeric products with CH2: links. These precursors react by losing hydride ion to give blue oligomeric dyes. Carbazoles substituted in the 9-position by CH2SPh, CH2SOPh, and CH2SO2Ph rearrange to give carbazole oligomers linked at the 3,6-positions. Products are characterised spectrally, and their mechanism of formation is discussed. 相似文献
7.
8.
Katarzyna?Grzelak-B?aszczykEmail author Krzysztof?Ko?odziejczyk Ewa?Bade?ek Franciszek?Adamicki 《European Food Research and Technology》2011,232(6):1027-1033
The aim of this work is to present the results of the analysis of composition of mono-, di- and oligosaccharides, including
the content of fructooligosaccharides as well as rafinose, stachyose in pseudo stalk of leek plants of the following cultivars:
Shelton F1, Belton F1 and Parton F1. Leek plants were stored in cold room at the temperature 0 °C and relative humidity around
98% in the period from December to May. Fructose, glucose, saccharose, fructooligosaccharides (FOS) as well as α-galactosides
were determined with the HPLC method with the application of water-alcohol extracts. It was shown that some of the studied
parameters have changed during storage, i.e., the glucose content increased from 4.4 ± 0.3 to 16.2 ± 1.6, fructose from 4.7 ± 0.2
to 23.8 ± 0.4, saccharose from 5.1 ± 0.7 to 18.7 ± 0.1, depending on the cultivar and the storage period. The largest increase
in the content of fructose and glucose took place between 60th and 90th day of storage which testifies to intensive hydrolysis
of fructans. Leek cv. Parton F1 was characterised by the largest content of fructans and the lowest susceptibility to hydrolysis.
The amount of kestose, nystose and rafinose after the period of storage changed from 0.3 ± 0.0 to 0.9 ± 0.2, 0.5 ± 0.1 to
1.8 ± 0.1, 0.8 ± 0.1 to 1.8 ± 0.2 g/100 g of dry mass, respectively. The content of stachyose, in turn, remained at a constant
level and amounts to around 0.5 g/100 g of dry mass. Leek plants kept in typical refrigeration conditions are characterised
by good durability and constitute a valuable merchandise. However, due to ongoing hydrolysis processes, the content of prebiotic
substances decreased what lowered the health-promoting value. 相似文献
9.
This paper focuses on the problem of the evaluation of strains around the inclusions of various shapes and properties located in the uniform matrix undergoing large plastic deformations. The analysis is performed using the rigid-plastic finite-element approach. The uniform plane-strain deformation field is simulated by an introduction of zero friction forces into the program for the compression process. An assumption that the die is wider than the sample allows to simulate ideally uniform flow of metal. Several shapes of the inclusions are investigated, but the results for three most common shapes of the particle's cross-section are presented in the paper. They are: square with the sides parallel to the main directions, square with the sides inclined under an angle of 45° to the main directions and round. 相似文献
10.
Peter G. Bruce Franciszek Krok James Evans Colin A. Vincent 《Polymer International》1988,20(3):193-194
A new solid polymer electrolyte, poly(ethylene oxide)-Hg(ClO4)2, has been prepared with the ratio of ethylene oxide units to mercury ions ranging from 4 to 20. The variation of conductivity with temperature does not follow a simple Arrhenius law. At high salt concentrations the films are entirely amorphous. 相似文献