Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data

FWN – Publicaties zonder aanstelling Universiteit Leide

<span style="font-size:14.0pt;line-height: 115%;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; color:black;mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language: HI" lang="EN-IN">New Na ⁺-glass -Na₂CO₃ composites for solid state electrochemical CO₂ gas sensor</span>

259-261Ionic conductivity of the Na +-glass -Na2CO3 composites prepared by liquid phase sintering technique is investigated using complex impedance analysis. The conductivity maximum is obtained for 50wt% glass added to Na2CO3. An enhancement in conductivity is discussed in the light of space charge layer at glass-crystal interface (hetero-junction). Whereas, the maximum is understood to be due to optimum dispersion of glass i.e., percolation threshold. The galvanic sensor utilising optimised composition along with open reference electrode exhibit good reversibility. The response time is found to be 1 minute. Sensor shows long term stability and negligible cross interference to SO2 and moisture

Cathode materials for intermediate temperature solid oxide fuel cells

305-309The superfine crystallites of Nd1.8Ce0.2CuO4+δ are obtained when prepared by mechanochemical reaction using different process control agents. The crystallite size, <i style="mso-bidi-font-style: normal">Cs = 34 nm is the smallest for Nd1.8Ce0.2CuO4+δ prepared using salicylic acid process control agent (NCCO(Sa)) as compared to others. The dc conductivity (1.64 S cm-1) is the highest for NCCO(Sa) amongst all, which is attributed to the smallest crystallite size and high sintered density. The agglomeration of superfine grains leads to optimal distribution of nano-pores results in low area specific resistance (1.1 ohm cm2) for the NCCO(Sa). The electrochemical performance suggests adsorption of oxygen by cathode as rate-limiting step. The proposed mechanochemical reaction is useful as a technique for the synthesis of materials with submicron-sized crystallites

Integrated GUI based software for data acquisition and analysis of electrochemical gas sensors

349-352<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">A integrated software for data acquisition and online analysis of electrochemical gas sensor using Visual Basic 4.0 as front tool under Win 95 environment is designed and implemented. The features of the software includes high performance windowing, deluxe tool kit for acquisition, analysis and graphics, menu driven monitoring with display and online integration of various events. It is user friendly, with capability to build and execute customised applications. The software supports good number of hardware which are useful for any research and development environment involved with the sensor related activities.</span

Glycine-nitrates combustion synthesis and properties of nano-sized Ce_1-xGd_xO_2-_d solid solution for solid oxide fuel cell viewpoint

525-530Nanocrystalline gadolinium-doped ceria powders for solid electrolytes have been successfully prepared via glycine nitrate combustion synthesis and characterized by TGA/DTA, XRD and SEM. Using these powders; highly dense ceramics have been prepared by sintering at 1100°C which is much lower temperature than 1600°C usually required for ceria solid electrolytes prepared by conventional ceramic technique. The effect of compositions on structure and conductivity has also been studied

<span style="font-size:14.0pt;line-height: 115%;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; color:black;mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language: HI" lang="EN-IN">Investigation on Ag₂SO₄:La₂(SO₄)₃ binary system</span>

255-258The ionic conductivity of (100-x) Ag2SO4: (x) La2(SO4)3 (where x = 0 to 60) system is investigated using complex impedance spectroscopy. The solid solubility limit up to 3.63 mole % of La2(SO4)3 in room temperature orthorhombic β-Ag2SO4 is set with the help of X-ray powder diffraction, differential scanning calorimetry and scanning electron microscopy. The ionic transport number seen to remain invariant with SO2 partial pressure. The major contribution to the conductivity within solid solubility limit is explained on the basis of presence of additional extrinsic vacancies. In bi-phase region, the ‘optimum’ dispersion of La2(SO4)3 for x=30 provides conductivity enhancement by two orders of magnitude.</span