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排序方式: 共有81条查询结果,搜索用时 31 毫秒
21.
G. Singh I. P. S. Kapoor S. M. Mannan 《Journal of Thermal Analysis and Calorimetry》1996,46(6):1751-1761
Thermal and explosion characteristics of ring(mono) substituted arylammonium perchlorates (RSAP) are studied by DTA, impact and friction sensitivity measurements. Exothermic decomposition temperature (T d) from DTA curves and impact sensitivity data (h 50%) were found to be linearly related to the Hammett substituent constant (σ+,σ?) andpK a values of the corresponding arylamines. A reaction scheme, based on the formation of reaction intermediates during decomposition and explosion, accounting for the products, is proposed which, involves proton transfer as the rate determining process and evolution of ammonia. It seems that oxidation-reduction reactions between the arylamine/substituted benzene and HClO4 or its decomposition products cause explosion. 相似文献
22.
S. Ahmad A. Mannan I. H. Qureshi 《Journal of Radioanalytical and Nuclear Chemistry》1993,170(1):165-170
A routine procedure has been developed for the simultaneous determination of uranium and thorium in high concentration thorium ores. INAA is used to determine the uranium and thorium concentration. However, for very low concentrations of uranium a radiochemical procedure based on the use of NPy/benzene as an extractant has to be employed. The precision and accuracy of the method has been determined by analyzing IAEA and NBL standard thorium/uranium ores. 相似文献
23.
A. Mannan S. Waheed S. Ahmad I. H. Qureshi 《Journal of Radioanalytical and Nuclear Chemistry》1992,162(1):111-123
Several potentially toxic trace elements, namely, Hg, Pb, Cd, As, Sb, Br and Se have been measured by INAA in combination with AAS techniques in the integrated diet representative of the inhabitants of Gujranwala, a highly industrialized city of Pakistan. The dietary intake values for these elements have been estimated from the prevailing concentration level in the summer and winter season diets, which reveals that present intake data are well within the reported WHO values and can be considered to be safe. Posslble sources of food contamination by the toxic elements and their adverse impacts on human heaith are briefly discussed. 相似文献
24.
Wu Mannan Zhang Quanliang Zhao Bingge Zhang Ling Zhai Qijie Gao Yulai 《Journal of Thermal Analysis and Calorimetry》2019,135(6):2995-3003
Journal of Thermal Analysis and Calorimetry - Indium droplets embedded in aluminum matrix were successfully prepared by melt spinning technique. The results showed that an amount of nano-sized... 相似文献
25.
Qingsheng Wang William J. Rogers M. Sam Mannan 《Journal of Thermal Analysis and Calorimetry》2009,96(1):225-233
Thermal degradation of copolymers, prepared from glycidyl methacrylate and acrylonitrile in varying molar ratios using 2,2′-azobisisobutyronitrile
as an initiator, was studied by thermogravimetry, derivative thermogravimetry, differential thermal analysis and mass spectrometry.
The fragmentation patterns in the mass-spectra were interpretable by comparison with the known degradation patterns of the
related materials. Thermal kinetic parameters, including activation energies and order of reaction of the degradation of the
prepared copolymers, were calculated from their thermoanalytical data. These parameters suggest an overall increase in thermal
stability with increasing content of acrylonitrile in the copolymers. 相似文献
26.
Mannan Zubaer Ibna Adhikari Shyam Prasad Kim Hyongsuk Chua Leon 《Nonlinear dynamics》2020,99(4):3169-3196
Nonlinear Dynamics - This paper presents an in-depth and rigorous mathematical analysis of a family of nonlinear dynamical circuits whose only nonlinear component is a Chua Corsage Memristor (CCM)... 相似文献
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A more general and realistic four-component magnetized plasma medium consisting of opposite polarity ions and nonthermal distributed positrons and electrons is considered to investigate the stable/unstable frequency regimes of modulated ion-acoustic waves (IAWs) in the D-F regions of Earth's ionosphere. A (3 + 1) -dimensional nonlinear Schrödinger equation, which leads to the modulation instability (MI) of IAWs, is derived. The parametric regimes for the existence of the MI, first- and second-order rogue waves, and also their basic features (viz., amplitude, width, and speed) are found to be significantly modified by the effect of physical plasma parameters and external magnetic field. It is found that the nonlinearity of the different types of electronegative plasma system depends on the positive to negative ion mass ratio. It is also shown that the presence of nonthermal distributed electrons and positrons modifies the nature of the MI of the modulated IAWs. The implication of our results for the laboratory plasma [e.g., (Ar+, F− ) electronegative plasma] and space plasma [e.g., (H+, H− ), () electronegative plasma in D-F regions of Earth's ionosphere] are briefly discussed. 相似文献
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Residual Metal Impurity Aids Facile In Situ Electrochemical Surface Derivatization of Single‐Walled Carbon Nanotubes
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Sidhureddy Boopathi Rajagopal Sudha Shanmugam Senthil Kumar Kanala Lakshminarasimha Phani 《化学:亚洲杂志》2014,9(11):3264-3268
Residual metal impurities were exploited as reactants in the functionalization of the surface of single‐walled carbon nanotubes (SWCNT) with nickel hexacyanoferrate (NiHCF) by simple electrochemical cycling in ferricyanide solutions. This facile in situ electrochemical modification process provides intimate contact between NiHCF and SWCNTs that improves the stability of the redox property and reactivity of NiHCF. The characteristic redox behavior of NiHCF on SWCNT surfaces can be used as an electrochemical probe to access qualitative and quantitative information on unknown electroactive metal impurities in SWCNTs. Significantly, the NiHCF‐modified SWCNTs exhibit pseudocapacitive behavior, and the calculated specific capacitances are 710 and 36 F g?1 for NiHCF‐SWCNTs and SWCNTs respectively. Furthermore, NiHCF‐SWCNTs were transformed into Ni(OH)2/SWCNTs and used for enzymeless glucose oxidation. 相似文献