http://nopr.niscair.res.in/handle/123456789/13224 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/13248 Title: Thermal decomposition mechanism of particulate core-shell KClO3-HMX composite energetic material <br/> <br/>Authors: Liao, Lin-Quan; Yan, Qi-Long; Zheng, Ya; Song, Zhen-Wei; Li, Jun-Qiang; Liu, Peng <br/> <br/>Abstract: The thermal decomposition mechanism of a newly designed composite material KClO₃-HMX (KC-HMX) is investigated by combined TG-DSC-FTIR technique and T/Jump in-situ thermolysis cell/FTIR (T/Jump FTIR) technique<span style="font-family:" ms="" mincho";mso-bidi-font-family:"ms="" mincho";letter-spacing:="" -.1pt"="" lang="EN-US">．It is shown that KC-HMX began to decompose at about 266°C without melting, and the fast stage of mass loss at the temperature range of 268.4~290.1°C is considered to be the result of the thermolysis and complex reactions of KClO₃ and HMX with energy release of 1859 J.g^-1, which exceeded that of pure HMX about 40%. It is also shown that CO, CO₂, NO₂ and H₂O were the main gaseous products. The T/Jump FTIR analysis showed that the competing reactions of N-N and C-N bonds cleavage occurred in initial stage of HMX decomposition are greatly affected by KClO₃. In contrast of pure HMX, there is no CH₂O and HCN detected in its thermolysis products. In presence of electronegative oxygen radical produced by thermolysis of KClO₃ oxidized CH₂O and HCN through gas-phase reaction “(NO₂+4O₂) + (2N₂O+5CH₂O) → 5NO+3CO+2CO₂+5H₂O”, which is probably the dominating reaction, being immediately followed by the decomposition reaction of HMX. </span> <br/> <br/>Page(s): 393-398 Wed, 28 Sep 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13247 Title: Nano-size copper oxide encapsulated urea – formaldehyde resin film for arsenic (III) removal from aqueous solutions <br/> <br/>Authors: Rastogi, R P; Singh, N B; Shukla, S K <br/> <br/>Abstract: The nano-size copper oxide with 40-50 nm dimensions was prepared through KNO₃: NaNO₃ eutectic melt and encapsulated in urea – formaldehyde (UF) resin during polymerisation. Particle size of CuO was determined by XRD and SEM techniques. CuO encapsulated in urea – formaldehyde resin in the form of film (~5 mm thickness) was used to remove As (III) content from aqueous solution. The process of As (III) removal was found to be efficient and cost effective. <br/> <br/>Page(s): 390-392 Wed, 28 Sep 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13246 Title: <span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Investigations on Mn_xZn_1-xFe₂O₄(x = 0.1, 0.3 and 0.5) nanoparticles synthesized by sol-gel and co-precipitation methods </span> <br/> <br/>Authors: Chand, Mahesh; Kumar, Arvind; Kumar, Sandeep; Shankar, Ajay; Pant, R P <br/> <br/>Abstract: Mn²⁺ substituted Zn ferrite nanoparticles have been synthesized using two different wet methods, sol-gel and co-precipitation. The doping effect of Mn²⁺ ion concentration on physical properties like structural and magnetic properties is investigated. The crystallite size and lattice parameter increases with increasing Mn²⁺ concentration. EPR study reveals that the line width and <i style="mso-bidi-font-style:normal">g</i>-factor increases with increasing Mn²⁺ concentration for co-precipitated particles whereas the reverse trend for sol-gel technique is observed. However, in both the processes the saturation magnetization (<i style="mso-bidi-font-style:normal">M</i>_s) and coercivity (<i style="mso-bidi-font-style:normal">H</i>_c) increase with increasing Mn²⁺ concentration. In a comparative study, the nanoparticles synthesized bysol-gel are more crystalline in nature as compared to co-precipitated particles. <br/> <br/>Page(s): 385-389 Wed, 28 Sep 2011 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/13245 Title: Low phase noise microwave oscillator using meander spurline resonator for X-band application <br/> <br/>Authors: Shrestha, Bhanu; Kim, Nam-Young <br/> <br/>Abstract: We present a simple compact meander spurline resonator and its application to low phase noise oscillator. The resonator which has a bandstop characteristic is used in the series feedback of oscillator. This miniaturized resonator consists of a defected meander spurline with inductive characteristics and capacitive characteristics. The microwave oscillator using the meander spurline resonator shows excellent phase noise performances of -103.23 dBc/Hz at a 100 kHz offset from the carrier frequency of 9.0 GHz with an output power of 15.23 dBm due to the high <i style="mso-bidi-font-style:normal">Q</i> value of the defected meander spurline resonator. The structure of resonators reduces the size and the cost. <br/> <br/>Page(s): 381-384 Wed, 28 Sep 2011 22:58:59 GMT