33 research outputs found
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 <sup>+</sup>-glass -Na<sub>2</sub>CO<sub>3</sub> composites for solid state electrochemical CO<sub>2</sub> 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
Perfomance of Electrochemical CO2 Gas Sensor with NASICON Dispersed in a Binary Solid Electrolyte System
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
On the Insertion of 7Li2 O : 3 B 2 O 3 Glass into the Polycrystalline 6Li2 SO 4 : 4Li2 CO 3 Composite System
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<sub>1-x</sub>Gd<sub>x</sub>O<sub>2-</sub><sub>d</sub> 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 Ag<sub>2</sub>SO<sub>4</sub>:La<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> 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