Indian Journal of

Engineering & Materials Sciences

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VOLUME 14

CODEN : IEMSEW

NUMBER 5

OCTOBER 2007

ISSN : 0971-4588

 

CONTENTS

 

Engineering

 

Automatic license plate location and recognition

337

        Z X Chen, CY Liu, G Y Wang & J G Liu

 

 

An efficient quantum cryptography’s algorithm for data security

346

Ajit Singh

 

 

Fatigue of high-strength fibre-reinforced concrete

352

Atef Badr

 

 

Influence of carbon black on the mechanical and electrical properties of asphalt mixtures

 

358

Perviz Ahmedzade & Tacettin Geckil

 

 

Capillary water absorption of self-compacting concrete under different curing conditions

 

365

Kazim Turk, Sinan Caliskan & Salih Yazicioglu

 

 

 

Materials Science

 

 

 

Synthesis, characterization and studies of phase transition in GeSe single crystals grown using different transporting agents

373

G K Solanki, M P Deshpande & M K Agarwal

 

 

Preparation, characterization and physical properties of Mg-Zn ferrites

381

B K Bammannavar, L R Naik, R B Pujar & B K Chougule

 

 

Predicting heats of fusion of nitramines

386

M H Keshavarz

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 337-345

 

 

Automatic license plate location and recognition

Z X Chen, CY Liu, G Y Wang & J G Liu

 

Automatic license plate recognition (LPR), which plays an important role in intelligent transport system has been proposed. In this study, a novel method to recognize license plates is presented. The proposed LPR technique consists of three main phases. Firstly, a segmentation phase contains the one-dimension cycle clear method locates the license plate within the image. Then, a procedure based upon feature projection separates the license plate into seven single-characters. Finally, the character recognizer extracts some feature points and uses the multi-stage classifier to get a robust solution under multiple acquisition conditions. Experiments have been conducted for the respective modules. Combining the above all rates, the overall rate of success algorithm is 92.5%. Our experiments show that the proposed method for LPR is correct and efficient.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 346-351

 

 

An efficient quantum cryptography’s algorithm for data security

Ajit Singh

 

Present paper provides a conceptual framework on the proposed C-QUBITS Key exchange algorithm, which is used as a base for the data security through quantum computing. In the first phase a detailed description of the BB84 Cryptographic protocol is given, from which the first algorithm based on the quantum cryptography has been derived. In this the emphasis is on the loopholes present in this algorithm which makes it less effective. In the next phase the focus is made on the C-QUBITS algorithm, which can be used for the exchange of key between the sender and the receiver. Thereafter, the key is used for the encryption of the data to be transferred between the two entities. This algorithm makes use of the concepts of quantum physics like polarization and more importantly C-NOT gate which is mainly used in case of qubits (quantum bits). Complete experimental set-up of the whole process involved in the algorithm has been presented and all possible cases have been discussed. Mathematical solution is derived which proves that data security through C-QUBITS algorithm is more effective and secure than other algorithms based on quantum approach.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 352-357

 

 

 

Fatigue of high-strength fibre-reinforced concrete

Atef Badr

 

This paper reports the results of an experimental research that has been conducted to investigate the fatigue behaviour of high-strength fibre-reinforced concrete (HS-FRC), produced using silica fume (SF) and reinforced with steel fibre. Silica fume is an essential ingredient for the production of high strength concrete (HSC). It modifies the microstructure of the cement paste and produces high-strength concrete with desirable performance characteristics. However, modifying the microstructure of the cement paste could impair the ability of concrete to resist dynamic loading, a property that can be restored using steel fibre reinforcement. Five different mixes were investigated. The control mix was produced without fibre or silica fume. The other four mixes were reinforced with 1% (by volume) steel fibre. The effect of silica fume was investigated using three different replacement percentages at 5, 10 and 15 % by weight.

The results suggested that the effect of steel fibre on the flexural fatigue strength was more significant than the effect of silica fume. The fatigue strength of mixes containing silica fume was slightly higher than that of the Portland cement HS-FRC. The reduction in flexural fatigue strength, due to increasing the number of loading cycles from 100,000 to 1,000,000, was negligible compared to the damage produced by the first 100,000 cycles. This outcome could have important technical and economical implications, as it would be sufficient to perform fatigue tests up to 100,000 cycles to rank several concrete mixes.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 358-364

 

 

Influence of carbon black on the mechanical and electrical properties of asphalt mixtures

Perviz Ahmedzade & Tacettin Geckil

 

The effect of carbon black used as a filler on the mechanical and electrically conductive properties of two types of asphalt mixtures was investigated. The asphalt mixtures in which carbon black and limestone fillers having the same aggregate gradation were prepared and optimum bitumen content was determined by Marshall stability test. Mechanical characteristics of the carbon black and control mixtures were evaluated by Marshall stability, indirect tensile stiffness modulus, creep stiffness, and indirect tensile strength tests. Based on these tests values it is clear that the best results were obtained from mixtures with carbon black filler. Obtained volume resistivity values of the all mixtures indicate that mixtures with carbon black filler have higher electrical conductivity than that of the control mixtures. The results of investigation showed that carbon black improves both mechanical and electrically conductive properties of the asphalt mixtures.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 365-372

 

 

Capillary water absorption of self-compacting concrete under different curing conditions

Kazim Turk, Sinan Caliskan  & Salih Yazicioglu

 

This paper reports an experimental study carried out to investigate the influence of addition of pozzolanic materials and curing regimes on the mechanical properties and the capillary water absorption (sorptivity) characteristics of self-compacting concrete (SCC). Portland cement (PC) concrete and two types of SCC, SCC-I with fly ash (30% FA/70% PC) and SCC-II with silica fume (10% SF/90% PC), specimens were prepared and cured in three different curing conditions (standard 20°C water, sealed and air cured) for the periods of 3, 7, 14 and 28 days. At the end of each curing period, compressive and tensile strengths and ultrasonic pulse velocity (UPV) values were determined; sorptivity coefficents were determined at 28 days. The results indicated that SCC-II specimens gave higher compressive and tensile strength and lower sorptivity coefficient values than those of corresponding SCC-I and PC concrete specimens, regardless of curing regimes and age of concrete. The results also showed a good correlation between the strength development of concrete and its sorptivity, i.e., as the compressive and tensile strengths increased due to the hydration, the sorptivity coefficients decreased significantly.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 373-380

 

 

Synthesis, characterization and studies of phase transition in GeSe single crystals grown using different transporting agents

G K Solanki, M P Deshpande & M K Agarwal

 

The paper reports growth of germanium monoselenide (GeSe) single crystals by vapour phase technique using different transporting agents. The single crystallinity and composition of the grown samples have been verified through transmission electron microscopy (TEM) and energy dispersive analysis of X-rays (EDAX) respectively.

In order to look for the possibility of phase transition, resistivity measurements have been carried out in different temperature ranges starting from 10 K. The results have indeed shown discontinuities both in the low temperature range as well as in the high temperature range. Such discontinuities in the past have been associated with possible phase transitions in GeSe. A possible explanation for the discontinuities is provided and the implications have been discussed.

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 381-385

 

 

Preparation, characterization and physical properties of Mg-Zn ferrites

B K Bammannavar, L R Naik, R B Pujar & B K Chougule

 

Polycrystalline nano-sized ferrites with the general chemical formula Mg1-x Znx Fe2O4 (where x = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared from a simple polymer matrix based precursor solution. The solution was composed of metal nitrates with polymer PVA and Sucrose. Thermolysis of the precursor mass at about 773 K resulted in the oxide phase. Samples of ferrites were characterized by various experimental techniques including scanning electron microscopy (SEM), X-ray diffraction studies, IR studies and VSM (vibrating sample magnetometer) analysis. The variation of resistivity with temperature shows the break at Curie temperature, indicating the transition from ferrimagnetism to paramagnetism however; the effects of porosity on electric and magnetic properties of the ferrite samples are also discussed.

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 14, October 2007, pp. 386-390

 

Predicting heats of fusion of nitramines

M H Keshavarz*

 

This paper describes a new procedure to predict heats of fusion of nitramines as an important class of energetic materials. This method can be applied for linear and cyclic nitamines. The number of oxygens and two specific structural parameters of nitamines would be needed in the new method. Heats of fusion predicted using the method described herein have a root mean square (rms) deviation of 3.71 kJ/mol from 48 measured values (corresponding to 22 molecules). The new method is also applied to two nitramines, i.e., 1,3,5,7,9,11-hexanitro-1,3,5,7,9,11-hexaazacyclododecane and 1,3,3-trinitroazitidine (TNAZ), which gives comparable results with respect to experimental values.