Showing papers by "Bishop Heber College published in 2012"

Enhanced photocatalytic degradation of azo dyes using nano Fe3O4

Abstract: Nanosized magnetic Fe3O4 synthesized via sonochemical route was used as a photocatalyst for the degradation of azo dyes, methyl red and congo red. The novelty of the photo catalyst is its easy recovery by magnetic force and its recycling ability due to its long-term stability, in addition to its cost effectiveness, non-toxicity and non-carcinogenicity. A detailed feasibility study has been carried out on the photocatalytic degradation of the azo dyes at various pH and at various concentrations of photocatalyst, dye and H2O2. The presence of photocatalyst is found to significantly accelerate the degradation of azo dyes and the optimal dosage is found to be 0.075 and 0.2 g/l for methyl red and congo red, respectively. Langmuir–Hinshelwood kinetic analysis revealed pseudo-first-order kinetics for the photocatalytic degradation of the dyes and the degradation products were identified using spectral analysis. The degradation study revealed the following order of reactivity: Photo-Fe3O4 > Photo-H2O2 > Fe3O4 > H2O2.

Vague Correlation Coefficient of Interval Vague Sets

Abstract: Various attempts have been made by researchers on the study of vagueness of data through intuitionistic fuzzy sets and vague sets, and also it was shown that vague sets are intuitionistic fuzzy sets. But there are algebraic and graphical differences between vague sets and intuitionistic fuzzy sets. In this paper an attempt is made to define the correlation coefficient of interval vague sets lying in the interval [0, 1], and a new method for computing the correlation coefficient of interval vague sets lying in the interval [-1, 1] using a-cuts over the vague degrees through statistical confidence intervals is presented by an example. The new method proposed in this paper produces a correlation coefficient in the form of an interval.

Green cloud computing

Abstract: Cloud computing is offering utility oriented IT services to users worldwide. It enables hosting of applications from consumer, scientific and business domains. However data centre hosting cloud computing applications consume huge amounts of energy, thereby contributing to high operational costs and carbon footprints to the environment. With energy shortages and global climate change leading our concerns these days, the power consumption of data centers has become a key issue. Thus, we are in need of green cloud computing solutions that cannot only save energy, but also reduce operational costs. The vision for energy efficient management of cloud computing environments is presented here. A green scheduling algorithm which works by powering down servers when they are not in use is also presented.

A Search for the Correlation Coefficient of Triangular and Trapezoidal Intuitionistic Fuzzy Sets for Multiple Attribute Group Decision Making

Abstract: This paper introduces a new technique for defining the correlation coefficient of triangular and trapezoidal intuitionistic fuzzy sets for solving Multi-attribute Group Decision Making (MAGDM) problems. In situations where the information or the data is of the form of triangular or trapezoidal intuitionistic fuzzy numbers, some arithmetic aggregation operators, namely the trapezoidal intuitionistic fuzzy ordered weighted averaging (TzIFOWA) operator and the trapezoidal intuitionistic fuzzy hybrid aggregation (TzIFHA) operator are utilized. A new model is developed to solve the MAGDM problems using a new type of correlation coefficient defined for trapezoidal intuitionistic fuzzy sets based on the trapezoidal intuitionistic fuzzy weighted arithmetic averaging (TzIFWAA) operator and the TzIFHA operator.

Influence of annealing on the photoluminescence of nanocrystalline ZnO synthesized by microwave processing

Abstract: Zinc oxide (ZnO) nanoparticles have been synthesized by a microwave heating method. The resulting powders were annealed at temperatures from 400°C to 800°C for 4 h. The annealed powders were characterized in terms of their structural, morphological, and optical properties by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and room-temperature photoluminescence (PL) spectroscopy, respectively. The XRD patterns of the samples revealed the formation of phase-pure ZnO, apparently without any impurities. However, FT-IR spectra revealed the presence of carboxylate impurities, the signals of which disappear as the annealing temperatures are increased from 400°C to 800°C. SEM pictures showed increasing size ZnO nanoparticles with increase in annealing temperature. The powder annealed at 800°C is identified as hexagonal wurzite ZnO. The improved PL spectral performance of the ZnO powder correlates well with the improved crystalline quality of the nanopa...

A simulation based study to implement Intelligent Transport Systems concepts in VANETs using AODV routing protocol in NS2

Abstract: The wireless medium plays a vital role in communication era in sharing information from one mobile device to another. These wireless devices (nodes) can form a temporary network called Ad-hoc network or they can use existing cellular network. Vehicular Ad-hoc Networks (VANETs) is a type of Ad-hoc network in which vehicles acts as nodes and communicates with the roadside units. VANETs are more helpful in implementing the Intelligent Transport Systems concepts to provide traffic situation, weather conditions and to perform safety warnings by using authentication mechanisms. In this paper, AODV routing protocol is used to implement the Intelligent Transport Systems (ITS) concepts in VANET. A simulation is performed using AODV routing protocol in NS2 to study the hurdles involved in providing a secure and trustworthy data transfer between the vehicular nodes. The data analysis is done based on the results collected from the simulation environment. The data's are traced out to find the absolute details of the network. Finally, the graphs are plotted for Throughput of dropped packets and Throughput of packets generated.

Awareness and application of cloud computing in Indian libraries: A study among librarians of engineering colleges of coimbatore district

Abstract: A questionnaire based study conducted to identify the awareness and applications of cloud computing in libraries in Indian context. It is found that most of the respondents (98.2%) are aware of the term cloud computing and 87.7% of the respondents are aware of the application of cloud computing in libraries. Half of the respondents (52.6%) are of the opinion that it is feasible to apply cloud computing in libraries in Indian context.

Different strategies to solve fuzzy linear programming problems

Abstract: Fuzzy linear programming problems have an essential role in fuzzy modeling, which can formulate uncertainty in actual environment In this paper we present methods to solve (i) the fuzzy linear programming problem in which the coefficients of objective function are trapezoidal fuzzy numbers, the coefficients of the constraints, right hand side of the constraints are triangular fuzzy numbers, and (ii) the fuzzy linear programming problem in which the variables are trapezoidal fuzzy variables, the coefficients of objective function and right hand side of the constraints are trapezoidal fuzzy numbers, (iii) the fuzzy linear programming problem in which the coefficients of objective function, the coefficients of the constraints, right hand side of the constraints are triangular fuzzy numbers. Here we use α –cut and ranking functions for ordering the triangular fuzzy numbers and trapezoidal fuzzy numbers. Finally numerical examples are provided to illustrate the various methods of the fuzzy linear programming problem and compared with the solution of the problem obtained after defuzzyfing in the beginning using ranking functions.

Structural and Spectral Analysis of a Mannich Base: 3-(Morpholin-4-ylmethyl)-1,3-Benzothiazole-2-Thione

Abstract: The crystal structure of 3-(morpholin-4-ylmethyl)-1,3-benzothiazole-2-thione, C12H14N2OS2, crystallizes in the monoclinic space group (P21/c). This benzothiazole derivative is a mannich base. Methylene group bridges the molecules of 2-mercapto benzothiazole and morpholine with an angle at the methylene bridge being 110.31(12)° [N–C–N]. The dihedral angle between the benzothiazole and morpholine planes is 70.37(5)°. The morpholine ring adopts a chair conformation. The molecular structure is stabilized by the weak C–H···S hydrogen bond in addition to the C–H···π and π···π interactions. Present study reports the conformation and hydrogen bonding interactions. Spectral analysis complement the structure analyzed. The compound 3-(morpholin-4-ylmethyl)-1,3-benzothiazole-2-thione is a Mannich base. The crystal structure gives a picture of a methylene group bridging the molecules of 2-mercapto benzothiazole and morpholine.

A Strategic Study of Mining Fuzzy Association Rules Using Fuzzy Multiple Correlation Measues

Abstract: Two different data variables may behave very similarly. Correlation is the problem of determining how much alike the two variables actually are and association rules are used just to show the relationships between data items. Mining fuzzy association rules is the job of finding the fuzzy item-sets which frequently occur together in large fuzzy data set, where the presence of one fuzzy item-set in a record does not necessarily imply the presence of the other one in the same record. In this paper a new method of discovering fuzzy association rules using fuzzy correlation rules is proposed, because the fuzzy support and confidence measures are insufficient at filtering out uninteresting fuzzy correlation rules. To tackle this weakness, a fuzzy correlation measure for fuzzy numbers, is used to augment the fuzzy support-confidence framework for fuzzy association rules. We have extended the Apriori algorithm to fuzzy multiple correlation analysis, which is the new approach presented in this paper comparing to m...

Expected Time to Recruitment in an Organization with Two Grades Involving Two Thresholds

Abstract: : An organization with two grades subjected to loss of man-power due to the policy decisions taken by the organization is considered .Three mathematical models are constructed using an univariate recruitment policy, based on shock model approach involving optional and mandatory thresholds for the loss of man-power in each grade. The system performance measures namely mean and variance of time to recruitment are obtained for all the models when (i) the loss of man-hours form a sequence of independent and identically distributed exponential random variables (ii)the inter-decision times form an order statistics according as the optional thresholds follow exponential or extended exponential and the distribution of mandatory thresholds possess SCBZ property .The analytical results are numerical illustrated and the influence of nodal parameters on the performance measures is also reported. 2000 MSC Subject classification: Primary 90B70, Secondary: 91B40, 91D35.

Issues and Challenges in Determining Quality of Service Requirements in Wired, Wireless and Mobile Networks

Abstract: The Quality of Service (QoS) is a set of service requirements to be met by the network. The set of service requirements are determined by many levels of QoS building blocks such as the user, application, infrastructure, standard, regulator, etc. These levels increase the complexity in providing QoS. In other words, QoS requirements must be carefully mapped from user-level to application-level, application-level to infrastructural-level, infrastructure-level to standard-level, etc. Apart from intra-network level mapping, there is a need for inter-network level mapping as data may travel via heterogeneous networks such as wired, wireless and mobile networks. Here, intra-network denotes within single network and inter-network denotes between networks. The challenges involved in mapping QoS requirements from wired network to wireless network to mobile network and vice versa are inevitable. The outcome of this chapter throws light on the issues and challenges involved in intra-network and inter-network levels.

An End-To-End Secure Mobile Payment System Using Public Key Infrastructure System

Abstract: The exponential growth of wireless technologies and mobile devices, the mobile commerce becomes a significant for every one's life. Its popularity introduces a new channel for the research that is, M-Payment or Mobile Payment in terms of identifying new applications, designing frameworks, and producing innovative business models. The development of secured mobile payment system becomes a major research topic in the field of mobile commerce. A study reveals that there are wide ranges of mobile payment solutions and models available in the market, but there is no specific and global mobile payment system for academic institutions without huge investment. To overcome, this paper proposes a novel model called Mobile Payment Consortia System (MPCS) to carry out the transactions from the bank to the academic institutions for the payment of fees by students through mobile phone. MPCS provides an end-to-end security using Public Key Infrastructure (PKI). This paper mainly focuses on strong authentication and secu...

Linear optical, microhardness and electrical properties of glycine potassium Fluoride (GPF) crystal

Abstract: Single crystals of glycine Fluoride (GPF) have been grown by slow evaporation solution growth technique It is a potential material for nonlinear optical applications FTIR analysis was used to estimate qualitatively the presence of the functional groups in the grown crystal Its linear optical character has been assessed by UV analysis and found that there was less absorption in the entire region The hardness of the grown crystal was analyzed by Vicker's micro hardness tester The electrical property of the crystal was studied using Four Probe methods

1,5-Dimethyl-2-phenyl-4-[phenyl(pyri-din-2-ylamino)methyl]-1H-pyrazol-3(2H)-one.

Abstract: In the title compound, C23H22N4O, the pyrazole ring makes dihedral angles of 45.57 (11)° with the attached phenyl ring, and 83.98 (10) and 67.85 (10) °, respectively, with the other phenyl ring and the pyridyl ring. The pyridyl ring makes a dihedral angle of 80.15 (10)° with the adjacent phenyl ring. In the crystal, N—H⋯O hydrogen bonds supplemented by weak C—H⋯O hydrogen bonds link the mol­ecules into chains which run parallel to the a-axis direction.

Knowledge Management and Academic Libraries

Abstract: Knowledge management is not one single discipline. It is an integration of numerous activities and fields of study. The field of knowledge management helps in improving the effectiveness of academic libraries and for their parent institutions. This chapter introduces knowledge management principles and its application in academic libraries and librarians as knowledge managers.