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151.
Chaudhry AA Haque S Kellici S Boldrin P Rehman I Khalid FA Darr JA 《Chemical communications (Cambridge, England)》2006,(21):2286-2288
Nano-particle hydroxyapatite (HA) rods, were rapidly synthesised using a three pump continuous hydrothermal process (using a water feed at up to 400 degrees C and at 24 MPa): the product was obtained as a highly crystalline and phase pure material, without the need for an ageing step or subsequent heat treatment. 相似文献
152.
S. K. Samanta U. C. Gupta M. L. Chaudhry 《4OR: A Quarterly Journal of Operations Research》2009,7(4):337-361
This paper considers a single-server queueing model with finite and infinite buffers in which customers arrive according to
a discrete-time renewal process. The customers are served one at a time under discrete-time Markovian service process (D-MSP).
This service process is similar to the discrete-time Markovian arrival process (D-MAP), where arrivals are replaced with service
completions. Using the imbedded Markov chain technique and the matrix-geometric method, we obtain the system-length distribution
at a prearrival epoch. We also provide the steady-state system-length distribution at an arbitrary epoch by using the supplementary
variable technique and the classical argument based on renewal-theory. The analysis of actual-waiting-time (in the queue)
distribution (measured in slots) has also been investigated. Further, we derive the coefficient of correlation of the lagged
interdeparture intervals. Moreover, computational experiences with a variety of numerical results in the form of tables and
graphs are discussed. 相似文献
153.
Yetta Eagleman Marvin Weber Anurag Chaudhry Stephen Derenzo 《Journal of luminescence》2012,132(11):2889-2896
X-ray excited emission spectra, photoluminescence excitation and emission spectra, optical reflectivity spectra, and pulsed X-ray and optical excited luminescence decay measurements are reported for cerium-doped La2Hf2O7 powders prepared by solid state synthesis. A broad luminescence associated with oxygen vacancies is observed in the region 350–750 nm with a peak around 460 nm. The photoluminescence spectra and the number of oxygen vacancies vary for samples annealed in oxidizing or reducing atmospheres and with the temperature of the synthesis process. Increasing the cerium concentration reduces the oxygen-vacancy-related emission due to the presence of Ce4+. First principles calculations predict that Ce4+ can substitute in Hf sites; this is confirmed from the optical reflectivity spectrum of cerium-doped La2Hf2O7. Photoluminescence excitation and emission spectra characteristic of Ce4+ charge transfer transitions and possibly Ce3+ are also observed. Although trivalent cerium may be present, no emission observed from cerium-doped La2Hf2O7 can be attributed to Ce3+ in La sites. 相似文献
154.
155.
has been studied by using a complete active space MCSCF wave function generated by distributing eight electrons among eight orbitals. 相似文献