Dharmsinh Desai University

Nadiad, India

Dharmsinh Desai Institute of Technology was founded in 1968 as an institution of higher learning in Nadiad, Gujarat, India in the fields of Engineering and Technology. Wikipedia.

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Dabhi V.K.,Dharmsinh Desai University | Chaudhary S.,Ahmedabad University
Natural Computing | Year: 2015

Empirical modeling, which is a process of developing a mathematical model of a system from experimental data, has attracted many researchers due to its wide applicability. Finding both the structure and appropriate numeric coefficients of the model is a real challenge. Genetic programming (GP) has been applied by many practitioners to solve this problem. However, there are a number of issues which require careful attention while applying GP to empirical modeling problems. We begin with highlighting the importance of these issues including: computational efforts in evolving a model, premature convergence, generalization ability of an evolved model, building hierarchical models, and constant creation techniques. We survey and classify different approaches used by GP researchers to deal with the mentioned issues. We present different performance measures which are useful to report the results of analysis of GP runs. We hope this work would help the reader by facilitating to understand key concepts and practical issues of GP and steering in selection of an appropriate approach to solve a particular issue effectively. © 2014, Springer Science+Business Media Dordrecht.

Mehta P.D.,Dharmsinh Desai University | Chakrabarty S.B.,Space Applications Center
Journal of Electrostatics | Year: 2012

This paper presents a method for the evaluation of the capacitance of the dielectric coated metallic plates forming a corner using the method of moments based on the pulse basis function and the point matching. Two integral equations are formed based on the boundary conditions for the potential on the conductor surface and continuity of the normal component of the displacement flux density at the dielectric-free space interface. A set of simultaneous equations are formed from the two integral equations using the method of moments. The total free charge on the conductor surface is found from the solution of the set of simultaneous equations. Numerical data on the capacitance and the charge distribution are presented. The validity of the analysis has been justified by comparing the data on the capacitance that is available in the literature for a metallic structure with the data on the capacitance computed with the present method for a similar structure considering a very low dielectric constant as well as a very thin dielectric coating. Further validation has been carried out by comparing the capacitance data of the specific case when the angle between two metallic plates is 180° forming a dielectric coated metallic rectangular plate for which the capacitance data are available in the literature. © 2012 Elsevier B.V.

Bhatt J.,Pandit Deendayal Petroleum University | Bhatt J.,Dharmsinh Desai University | Shah V.,Dharmsinh Desai University | Jani O.,Campus Management
Renewable and Sustainable Energy Reviews | Year: 2014

Conventional electrical grid is transforming into smart grid - an evolutionary solution to satisfy rapidly emerging and vibrantly changing requirements of utilities and customers by intelligently leveraging telemetry concepts of instrumentation and control engineering in form of communication technology network infrastructure. The paper presents analogy of 'smart grid' to 'industrial process' and 'communication technology infrastructure' to 'instrumentation telemetry'. Automated Metering Infrastructure (AMI), monitoring and automation of substations, power network monitoring, Home Automation Network (HAN), Demand Response (DR) and integration of solar PV-have been identified as 'Critical Applications' and Reliability, Scalability, Interoperability, Congestion, Energy Efficiency, Latency and Security - have been identified as 'Critical Parameters'. Review of recent works has been presented for each segment. © 2014 Elsevier Ltd. All rights reserved.

Jain D.,University of Kota | Mishra M.,Dharmsinh Desai University | Rani A.,University of Kota
Fuel Processing Technology | Year: 2012

A series of solid base catalysts were synthesized by functionalization of different weight fractions (5, 10, and 15 wt.%) of 3-aminopropyltrimethoxysilane (APTMS) on thermally activated F- type fly ash (SiO 2 and Al 2O 3 > 70%). Catalyst characterization was undertaken using different analytical techniques such as FTIR, XRD, SEM-EDX, TEM, N 2 - adsorption desorption, BET surface area analysis, TGA and AAS. The results showed that appropriate amount (10 wt.%) of aminopropyl groups results in excellent catalytic performance tested for condensation of ethyl cyanoacetate and cyclohexanone at 120 °C to produce Ethyl (cyclohexylidene) cyanoacetate (92% yield), an important intermediate of gabapentin (Neurontin), widely used in the treatment of epilepsy to relieve neuropathic pain, under solvent free conditions and in low cost route. The catalyst NH 2FA-10 was reusable up to three reaction cycles. The work reports an innovative use of solid waste fly ash as an effective solid base catalyst. © 2011 Elsevier B.V. All rights reserved.

Chinubhai A.,Dharmsinh Desai University
International Journal of Software Engineering and its Applications | Year: 2011

A number of different factors are thought to influence the efficiency of the software development process. These include programming languages, use of formal methodologies, CASE tools, etc. Moreover, efficiency in the context of software development has traditionally been measured as the ratio of functionality, either lines of code or functions points, and the effort expended. This is a unidimensional measure and ignores factors such as quality and elapsed time. This study utilizes Data Envelopment Analysis (DEA) to develop a multidimensional measure of efficiency in the context of software development and then examines how efficiency varies with other influencing factors such as the use of CASE tools, use of methodologies, team size, application type, etc. using a decision tree based model.

Dixit M.,Dharmsinh Desai University | Mishra M.,Dharmsinh Desai University | Joshi P.A.,Dharmsinh Desai University | Shah D.O.,Dharmsinh Desai University
Catalysis Communications | Year: 2013

The catalytic activity of Mg-Al hydrotalcite supported copper catalyst was investigated for clean C\C and C\N bond forming reactions using alcohols as alkylating agent via borrowing hydrogen methodology. The catalyst showed excellent conversion of ketone and amine substrates (71-99%) to alkylated products with high selectivity in alkylation reactions. © 2012 Elsevier B.V.

Tayade K.N.,Dharmsinh Desai University | Mishra M.,Dharmsinh Desai University
Journal of Molecular Catalysis A: Chemical | Year: 2014

The catalytic activity of MCM-41 mesoporous silica (MS) and Al grafted MCM-41 (Al-MS) with varied amount of Al were studied for oxidative self and cross coupling of benzyl amines to imines. The role of Al, its amount, acidity of the catalyst, effect of reaction conditions (especially presence of solvent and excess air) and amines nature on the oxidative coupling reactions were investigated. Surface OH groups play an effective role in amine activation by hydrogen bonding, whereas the acid sites generated by incorporation of optimum amount of Al further improve the activity. The Al in optimum amount (Si/Al: 20) showed good catalytic activity in self coupling of benzyl amine as compared to MS and Al-MS with high Al loading. A suitable polar solvent and presence of excess air significantly promote the activity of MS and Al-MS for amine coupling reactions. The MS without Al was also found to be efficient catalyst for oxidative self and cross coupling of amines. The presence of Al in Al-MS (in optimum amount, i.e., Si/Al: 20) made the self coupling of benzyl amine faster than MS, whereas the cross coupling reactions with Al-MS were observed to be slightly slower than MS, which is probably due to competitive adsorption of amine substrate and amine nucleophile over acidic sites. The activity of MS and Al-MS catalysts for self and cross coupling reactions was also dependent of the amines nature (basicity and nucleophilicity).© 2013 Elsevier B.V. All rights reserved.

Gor A.K.,Dharmsinh Desai University | Bhatt M.S.,Dharmsinh Desai University
Conference Proceeding - 2015 International Conference on Advances in Computer Engineering and Applications, ICACEA 2015 | Year: 2015

Face detection is important step in face recognition, expression analysis, security, surveillance which has challenges due to multiple scales, views, rotations of faces & false background objects. Skin color segmentation, connected component extraction & correlation analysis on image is done to reduce search space & to improve detection rate. Cascaded face detectors are trained using Viola & Jone's Adaboost based Machine learning algorithm for each possible range of views & possible rotations. Segmented regions of 16∗16 sizes are given to Cascaded face detectors to verify the presence of face. Experimental results show that it has very good detection rate for frontal & remarkable rate non-frontal, multi-view faces with negligible time duration in poor background/weather/lighting conditions. © 2015 IEEE.

Tayade K.N.,Dharmsinh Desai University | Mishra M.,Dharmsinh Desai University
Catalysis Science and Technology | Year: 2013

Propylsulfonic acid functionalized silica (SFS) catalysts with varying amounts of surface propylsulfonic acid species (PrSA) and acidity were synthesized and characterized. The aldol condensation of benzaldehyde and n-heptanal over SFS catalysts was studied as a model reaction (which involves cross and self condensation reactions) to investigate the role of surface PrSA species in the cross condensation. The reaction temperature, reactant molar ratio and solvent nature (polar/non-polar) were found to be major reaction parameters controlling the cross and self aldol product selectivity. It was observed that the characteristics of carbonyl substrates influence their reactivity towards cross and self condensation over SFS catalyst. © 2013 The Royal Society of Chemistry.

Khatri C.,University of Kota | Mishra M.K.,Dharmsinh Desai University | Rani A.,University of Kota
Fuel Processing Technology | Year: 2010

Synthesis of highly active nano-crystalline, thermally stabilized solid acid catalyst has been reported by loading different weight fractions of sulfated zirconia on chemically activated fly ash through two step sol-gel technique. The catalysts were characterized using powder XRD, FT-IR, N 2-adsorption desorption study, CHNS elemental analysis, SEM-EDAX and their acidity were measured by pyridine adsorbed FTIR. Liquid phase benzylation of benzene and toluene with benzyl chloride was studied as test reaction for catalytic activity of SZF catalysts. A very high conversion of benzene (87%) and toluene (93%) were observed, which is attributed to significant amount of acid site on the catalyst surface. The FTIR study of the pyridine adsorbed samples reflects the presence of Brønsted as well as Lewis acid sites. The catalyst with 12 wt.% zirconia (SZF-12) was regenerated and reused up to four reaction cycles with equal efficiency as in the first run. © 2010 Elsevier Ltd. All rights reserved.

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