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Murugavel S.,Vellore Institute of Technology | Manikandan N.,Bharathidasan Engineering College | Selvakumar R.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

In the title compound, C16H11Cl2NOS, the seven-membered thiazepine ring adopts a distorted twist-boat conformation. The dihedral angle between the mean plane of the benzothiazepine ring system and the benzene ring is 78.6 (1)°. The molecular conformation is stabilized by a weak intramolecular C-H⋯Cl hydrogen bond, which generates an S(5) ring motif. In the crystal, pairs of N-H⋯O hydrogen bonds link inversion-related molecules into dimers, generating R2 2(8) ring motifs. The crystal packing also features alternating π-π interactions between benzothiazepine benzene rings [inter-centroid distance = 3.740 (3) Å] and dichlorobenzene rings [inter-centroid distance = 3.882 (3) Å] to consolidate a three-dimensional architecture. Source


Subbarayan M.R.,Alagappa Chettiar College of Engineering And Technology | Senthil Kumaar J.S.,Bharathidasan Engineering College
International Journal of Ambient Energy | Year: 2015

An experimental investigation of diesel engine using cottonseed oil biodiesel and its blends with exhaust gas recirculation (EGR) techniques has been carried out. An optimum nozzle opening pressure of 250 bar and lower static injection timing of 20° before top dead centre (bTDC) are considered because it has been observed that these conditions only give minimum emissions. From the test results, it could be noted that there is an increasing trend of emission characteristics of HC, smoke density and NOx for both cold and hot EGR for all blends of fuel with respect to brake power. As compared with cold EGR, the hot EGR gives lower emissions at all loads. In hot EGR, among the blends, at no-load and full-load conditions, the B100 gives the highest reduction in NOx of 14.23% and 7.91%, respectively. However, the use of EGR leads to a rise in soot emission because of soot–NOx trade-off for both the cases. © 2015 Taylor & Francis Source


Subbarayan M.R.,Alagappa Chettiar College of Engineering And Technology | Senthil Kumaar J.S.,Bharathidasan Engineering College
Biofuels | Year: 2015

An experimental investigation of diesel engine performance fuelled with cotton seed oil methyl ester (COME), pumpkin seed oil methyl ester (POME) and its blends with neat diesel using Exhaust Gas Recirculation technique have been carried out. An optimum nozzle opening pressure of 250 bar and lower static injection timing of 20° bTDC is considered as it has been observed that these conditions offer better performance and are lower in emissions. From the experimental results, it could be observed that there is a decreasing trend of emission characteristics of Hydro Carbon, smoke density and NOx for Exhaust Gas Recirculation (EGR) for both COME and POME at full load with respect to blend ratio. The percentage reduction in oxides of nitrogen for B100 COME-EGR is 1.39% and for B100 POME-EGR is 1.11% as compared to B100 conventional method. The percentage reduction in oxides of nitrogen for B25 COME-EGR is 0.94% and for B25 POME-EGR is 0.13% as compared to B25 conventional method at full load condition. The same trend is followed for all other blends such as B50 and B75. However, the use of EGR leads to a rise in soot emission because of the soot-NOx trade-off for both cases. © 2015 © 2015 Taylor & Francis. Source


Sudhakar A.,Bharathidasan Engineering College | Kalaiarasi K.,Tamil University
International Journal of Applied Engineering Research | Year: 2015

Protecting the digital data through encryption using tools and external codes are highly cost effective and also results in performance degradation. To achieve much efficiency in encryption a reconfigurable cryptographic microprocessor is designed in this project to offer maximum digital security. With the conventional design of Rijndeal and DES encryption standards as supporting co- processors, a brute force attack algorithm also been implemented in the design to ensure the robustness of this processor design to serve all kind of encryption and decryption needs. A typical CPU unit with RAM, ALU, PC, Register bank and Buses are included as prioritized units for utilizing the Cryptographic co-processors which consists of Parallel Processing Unit, Bit permutation unit, sequencing cache and Byte permutation units. A sophisticated instruction sets have been derived to issue control signals to the main processor to initiate and control cryptographic operations. The performance evaluation of this processing design also analyzed through a programmable FPGA kit. © Research India Publications. Source


Murugavel S.,Vellore Institute of Technology | Manikandan N.,Bharathidasan Engineering College | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The title compound, C14H13NO3S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahía et al. [Acta Cryst. (1999), C55, 2158-2160]. Polymorph (II) crystalllized in the space group P21/c (Z = 4), whereas the title polymorph (I) occurs in the space group P21/n (Z = 4). The dihedral angle between the two aromatic rings is 75.9 (1)° in (I) compared to 81.9 (1)° for (II). In both polymorphs, two S(6) rings are generated by intra-molecular N-H⋯O and C-H⋯O hydrogen bonds, resulting in similar mol-ecular geometries. However, the two polymorphs differ concerning their crystal packing. In (I), mol-ecules are linked into C(8) zigzag chains along the b axis by C-H⋯O hydrogen bonds, whereas in (II) mol-ecules are linked by C-H⋯O hydrogen bonds, forming C(7) chains along the b axis. The title polymorph is further stabilized by inter-molecular C-H⋯π and π-π inter-actions [centroid-centroid distance = 3.814 (1) Å]. These inter-actions are not evident in polymorph (II). Source

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