Workability behaviour of Fe-C-Mo steel preforms during cold forging

A systematic method to construct the workability diagram for powder metallurgy (P/M) materials has been proposed. Preforms of Fe-0.8%C, Fe-0.8%C-1%Mo and Fe-0.8%C-2%Mo were prepared to the relative density of 0.86 with two different geometries through primary operations of P/M processes. Each sintered preform was cold upset forged with incremental compressive loading of 0.04MN under three different lubricant conditions till a visible crack appeared at the free surface. Oyane's fracture criterion was used to develop a theory to study P/M products. The least square method was used to determine the constants in fracture criteria and these equations were eventually used to construct workability diagram. It is found that the proposed method was well in agreement with the experimental results

Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set

We report a measurement of the bottom-strange meson mixing phase \beta_s using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity. We report confidence regions in the two-dimensional space of \beta_s and the B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2, -1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +- 0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +- 0.009 (syst) ps, which are consistent and competitive with determinations by other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012

Some studies on sintered cold deformed plain carbon alloy steels

Steel of Fe–0.8%C with and without addition of 1.0%Mo were considered for the present investigation. Experimental analysis was studied for attained density against induced strain parameter. Various stress parameters were determined and studied for its behaviour against strain. Instantaneous plastic Poisson’s ratios of were computed and was compared with conventional. All these characteristics were extensively studied under the influence of composition as well as aspect ratios; however, friction condition and initial density of the preforms were kept constant

Fabrication and Photoresponse of Novel Carboxymethylcellulose (CMC) Based Bacteriorhodopsin (bR) Sensor

A single-pixel dry-type reconstituted bacteriorhodopsin (bR) sensor (Au/CMC + bR/ITO) incorporating carboxyrnethylcellulose (CMC) as the artificial membrane is fabricated according to a protocol developed to investigate signal acquisition from the proposed biosensor. Droplets of reconstituted purple membrane (PM) containing bR applied onto a gel-like solution of CMC placed on gold electrodes (anode) are allowed to dry under an electric field, utilising the PM fragment's net negative charge and electric dipole moment. The resulting bR matrix thin film with high molecular orientation is finally sandwiched together with a semi-transparent indium titanium oxide (ITO) counter electrode and proper electrical connections made to form a single pixel bR-CMC photosensor. Efficient and reproducible photoresponse observed upon illumination clearly exhibits the potential of the proposed biosensor for future photosensing works. (C) 2006 Elsevier B.V. All rights reserved

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Occurrence of the" Peaking Effect" Corresponding to the" Highest Range of Effective Intensities" exhibited by Bacteriorhodopsin (bR)-Carboxymethylcellulose (CMC) Biosensor upon Illumination

Photo-electrical characterization works were carried out to understand the basic functionality of the novel bacteriorhodopsin (bR) - Carboxymethylcellulose (CMC) photosensor proposed and fabricated earlier. A single-pixel sensor was fabricated and its photoresponse towards light intensities and thermal variations studied. The occurrence of the "peaking effect" corresponding to a certain "highest range of effective intensities" upon light illumination was also observed and discussed