Entity

Time filter

Source Type


Six novel Ni(II) complexes, namely, [Ni2(HL1)(OAc)2] (1), [Ni3L1 2]·H2O·2CH3CN (2), [Ni2(L2)(L3)(CH3CN)] (3), [Ni2(L2)2(H2O)2] (4), [Ni2(L2)2(DMF)2]2·2H2O (5), and [Ni(HL2)2]·H2O (6), were synthesized by reacting nitrophenol-based tripodal (H3L1) and dipodal (H2L2) Schiff base ligands with Ni(II) metal salts at ambient conditions. All the complexes were fully characterized with different spectroscopic techniques such as elemental analyses, IR, UV-vis spectroscopy, and electrospray ionization mass spectrometry. The solid-state structures of 2, 3, 5, and 6 were determined using single-crystal X-ray crystallography. The compounds 1, 3, 4, and 5 are dinuclear complexes where the two Ni(II) centers have octahedral geometry with bridging phenoxo groups. Compound 2 is a trinuclear complex with two different types of Ni(II) centers. In compound 3 one of the Ni(II) centers has a coordinated acetonitrile molecule, whereas in compound 4, a water molecule has occupied one coordination site of each Ni(II) center. In complex 5, the coordinated water of complex 4 was displaced by the dimethylformamide (DMF) during its crystallization. Complex 6 is mononuclear with two amine-bis(phenolate) ligands in scissorlike fashion around the Ni(II) metal center. The single crystals of 1 and 4 could not be obtained; however, from the spectroscopic data and physicochemical properties (electronic and redox properties) it was assumed that the structures of these complexes are quite similar to other analogues. DNA binding abilities and phosphatase-like activities of all characterized complexes were also investigated. The ligand denticity, coordinated anions/solvents (such as acetate, acetonitrile, water, and DMF), and cooperative action of two metal centers play a significant role in the phosphate ester bond cleavage of 2-hydroxypropyl-p-nitropenylphosphate by transesterification mechanism. Complex 3 exhibits highest activity among complexes 1-6 with 3.86 × 105 times greater rate enhancement than uncatalyzed reaction. © 2014 American Chemical Society. Source


Gupta V.,Jawaharlal Nehru Government Engineering College | Chauhan D.S.,Uttarakhand Technical University | Dutta K.,National Institute of Technology Hamirpur
International Journal of Computer Applications in Technology | Year: 2015

Context: The main challenge in incremental delivery of software is the testing of the increment with minimal number of test cases in such a manner that effect of execution of the subset is equivalent to the execution of whole test suite (regression testing). The execution of test suite subset must guarantee the capability of revealing all faults at the earliest. Objective: This paper aims to perform regression testing with minimal number of test cases that are capable of locating large percentage of faults. Method: The hybrid regression testing algorithm proposed in this paper is based on the clustering by employing three parameters: a) requirement priorities; b) fault detection history; c) module modification history. Results: The proposed technique was applied on live project of "Tool for automatic analysis and comparison of different release planning methods". The total of 14 requirements are considered for evaluation of proposed testing technique (three were added after the first review, leading to the process of reprioritisation). Conclusion: The evaluation of technique on real software revealed that the proposal resulted in better faults localisation with minimal number of test cases although its evaluation on a mature software system is kept as future work. © 2015 Inderscience Enterprises Ltd. Source


Gupta C.,JIIT Noida | Srivastav M.,JIIT Noida | Gupta V.,Jawaharlal Nehru Government Engineering College
International Journal of Computer Applications in Technology | Year: 2015

Software evolution is a continuous process carried out with the aim of extending base applications either for adding new functionalities or for adapting software to the changing environment. This paper proposes a new approach of estimating impact analysis by allocating tokens to the changes encountered in the two versions of the software system. An algorithm is proposed for token allocation and for determining matches which take into account a minimum threshold value to predict the matched results. To establish confidence in effectiveness and efficiency, presented technique is illustrated with the help of an example and the results of analysis are promising towards achieving the aim of the proposed endeavour. Further, a performance-based comparison between existing techniques is also provided in support of this research. The impact set produced will be more precise than other techniques and this data can then be used by a software engineer in determining the changes made to the software system. Thus, the proposed technique can help software engineer to perform selective regression testing by optimising the number of test cases. © 2015 Inderscience Enterprises Ltd. Source


Malhotra U.,Jawaharlal Nehru Government Engineering College | Maity S.,National Institute of Technology Jalandhar | Chatterjee A.,National Institute of Technology Jalandhar
Journal of Applied Polymer Science | Year: 2015

This article describes the preparation of polypyrrole-silk composite fabric by in situ chemical polymerization of pyrrole. In situ polymerization process has been optimized by employing Box-Behnken response surface design. The effect of process parameters on surface resistivity of the fabric has been statistically analyzed. Most significant process parameter and interaction effects have been identified. Thermal, electrical, and morphological properties of the composite fabric have been studied. Surface resistivity of the fabric obtained is 636.33 Ω. The fabric composite shows a liner V-I characteristic like an Ohmic conductor. An exponential rise of surface temperature of the fabric is observed by the application of DC voltage across it. Optical microscopic and SEM studies reveal uniform and even coating of polypyrrole on silk surface. FTIR studies indicate a possible chemical interaction between polypyrrole and silk. The polypyrrole-treated composite fabric exhibits enhanced thermal stability as is evidenced from DSC and TGA result. © 2014 Wiley Periodicals, Inc. Source


Gupta V.,Uttarakhand Technical University | Gupta V.,Jawaharlal Nehru Government Engineering College | Chauhan D.S.,Uttarakhand Technical University | Dutta K.,National Institute of Technology Hamirpur | Gupta C.,Jaypee Institute of Information Technology
International Journal of Software Engineering and its Applications | Year: 2013

The task of requirement reprioritization is an important activity initiated due to the dynamism in the developing & the working environment of the software. Reprioritization is focused on the re-allotment of priorities to both implemented as well as non implemented ones. Focusing the implemented ones will ensure quality of regression testing and stressing on non implemented ones will ensure to consider the delayed as well as new or changed requirements. The reprioritization is complex decision making and effortful activity. Thus this task will require some heuristic parameters that could lead to the minimization of reprioritization efforts without any negative fabrication of quality of the current version. This paper proposed a multilayered dynamic approach for requirement reprioritization that is well suited for both agile and non agile development methodologies employing any prioritization method. The proposal is illustrated with the help of live case study of Library Management Software System developed in the Computer Programming laboratory of National Institute of Technology, Hamirpur © 2013 SERSC. Source

Discover hidden collaborations