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排序方式: 共有313条查询结果,搜索用时 31 毫秒
121.
Parolin TJ Salman Z Chakhalian J Song Q Chow KH Hossain MD Keeler TA Kiefl RF Kreitzman SR Levy CD Miller RI Morris GD Pearson MR Saadaoui H Wang D MacFarlane WA 《Physical review letters》2007,98(4):047601
The temperature dependence of the frequency shift and spin-lattice relaxation rate of isolated, nonmagnetic (8)Li impurities implanted in a nearly ferromagnetic host (Pd) are measured by means of beta-detected nuclear magnetic resonance (beta-NMR). The shift is negative, very large, and increases monotonically with decreasing T in proportion to the bulk susceptibility of Pd for T > T* approximately 100 K. Below T*, an additional shift occurs which we attribute to the response of Pd to the defect. The relaxation rate is much slower than expected for the large shift and is linear with T below T*, showing no sign of additional relaxation mechanisms associated with the defect. 相似文献
122.
Pravica M Grubor-Urosevic O Hu M Chow P Yulga B Liermann P 《The journal of physical chemistry. B》2007,111(40):11635-11637
We have used X-ray Raman spectroscopy (XRS) to study benzene up to approximately 20 GPa in a diamond anvil cell at ambient temperature. The experiments were performed at the High-Pressure Collaborative Access Team's 16 ID-D undulator beamline at the Advanced Photon Source. Scanned monochromatic X-rays near 10 keV were used to probe the carbon X-ray edge near 284 eV via inelastic scattering. The diamond cell axis was oriented perpendicular to the X-ray beam axis to prevent carbon signal contamination from the diamonds. Beryllium gaskets confined the sample because of their high transmission throughput in this geometry. Spectral alterations with pressure indicate bonding changes that occur with pressure because of phase changes (liquid: phase I, II, III, and III') and possibly due to changes in the hybridization of the bonds. Changes in the XRS spectra were especially evident in the data taken when the sample was in phase III', which may be related to a rate process observed in earlier shock wave studies. 相似文献
123.
The sterically congested tetraarylpyrenes 1-3, which can be readily accessed by Suzuki coupling, exhibit no-aggregation (pi-stacking) behavior in both solution and solid states. The indisposed tendency of 1-3 toward crystallization and their moderate molecular dimensions permit exploitation as blue light emitting materials in OLEDs with respectable device performances. 相似文献
124.
125.
Chow E Wong EL Pascoe O Hibbert DB Gooding JJ 《Analytical and bioanalytical chemistry》2007,387(4):1489-1498
Multiple electrodes, combined with a chemometric strategy to calibrate the measurement response, have been used for the determination
of an analyte across a broader dynamic range than is possible with a single electrode. The model system used for the detection
of copper comprised electrodes modified with a self-assembled monolayer. The electrodes were modified with the copper-complexing
species (3-mercaptopropionic acid, thioctic acid, and the peptides cysteine and Gly-Gly-His) and copper was determined over
concentrations ranging from nanomolar to millimolar using voltammetric analysis. We have demonstrated that by combining the
calibration functions from the four electrodes a better estimate (i.e. with smaller variance) of the concentration of the
analyte is obtained. Measurement uncertainty is expressed for independently prepared electrodes, which allows the possibility
of commercial production and factory calibration. The principles of using multiple electrodes modified with recognition elements
with different affinities for the target analyte to extend the dynamic range of sensors is a general one that could be applied
to other analytes. 相似文献
126.
Mukai K Ikedo Y Nozaki H Sugiyama J Nishiyama K Andreica D Amato A Russo PL Ansaldo EJ Brewer JH Chow KH Ariyoshi K Ohzuku T 《Physical review letters》2007,99(8):087601
The magnetism of LixCoO2 (LCO), which has a similar structure to NaxCoO2 (NCO), has been investigated by muon-spin spectroscopy and susceptibility measurements using samples with x=0.1-1 prepared by an electrochemical reaction. In the x range below 0.75, LCO was found to be Pauli paramagnetic down to 1.8 K, suggesting an intermediate- or weak-coupling regime, although disordered local moments, with volume fractions below approximately 20%, appear at low T for LCO with x > or = 0.5. The phase diagram and interactions of LCO are thus strikingly different from NCO, while the differences cannot be explained simply by structural differences between the two systems. 相似文献
127.
K.-W.Chow 《Acta Mechanica Sinica》2011,27(5):620-626
Exact doubly periodic standing wave patterns of the Davey-Stewartson (DS) equations are derived in terms of rational expressions of elliptic functions.In fluid mechanics,DS equations govern the evolution of weakly nonlinear,free surface wave packets when long wavelength modulations in two mutually perpendicular,horizontal directions are incorporated.Elliptic functions with two different moduli (periods) are necessary in the two directions.The relation between the moduli and the wave numbers constitutes the dispersion relation of such waves.In the long wave limit,localized pulses are recovered. 相似文献
128.
John G.Watson Judith C.Chow David A.Sodeman Douglas H.Lowenthal M.-C.Oliver Chang Kihong Park 《中国颗粒学报》2011,(3)
Size distributions of ambient aerosols at the Fresno Supersite were measured with four commercially available scanning mobility particle sizers(SMPS) . TSI nano,TSI standard,Grimm,and MSP instruments were collocated at the Fresno Supersite and particle size distributions were measured continuously from August 18 through September 18,2005. For particles with diameters between 10 and 200 nm,differences among hourly-average ambient particle concentrations ranged from 0% between the TSI nano and Grimm in the 30... 相似文献
129.
Studies of thermal IMDA cyclizations of (1E,7E)-1-nitro-deca-1,7,9-trienes and (1E,3Z,7E)-1-nitro-deca-1,3,7,9-tetraenes have been examined. Reactions of these nitroalkenes proceed via transition states featuring characteristics of asymmetric stretch asynchronicity and result in stereoselective formation of trans-fused decalin products. Substantial rate acceleration is observed for IMDA cyclizations exemplified by triene 14 due to steric repulsions of substituents in the tethering chain which promote facile stereocontrolled formation of trans-fused 26. 相似文献
130.
Lipids play critical roles in the biology of Mycobacterium tuberculosis, a notorious pathogen of man, but a systems-level approach to study these molecules have lagged behind other "omics" approaches. In this issue, Layre et?al. describe the development of a powerful lipidomics technique and creation of a comprehensive database that address this need. 相似文献