http : // www.niscair.res.in
Total visitors: 1,404 since 08-12-08
|
VOLUME 15 |
NUMBER 6 |
DECEMBER 2008 |
Engineering
|
Order reduction
using the advantages of differentiation method and factor division |
447 |
|
algorithm |
|
|
|
|
|
|
|
|
Effect of fibre
orientation on stress concentration factor in a laminate with central |
452 |
|
circular hole under transverse
static loading |
|
|
|
|
|
|
|
|
Computations of
flow field over Apollo and OREX reentry
modules at high speed |
459 |
|
|
|
|
|
|
|
Experimental investigation of tensile behaviour of
high strength concrete |
467 |
|
|
|
|
|
|
|
A novel quick
response charge pump phase locked loop |
473 |
|
|
|
|
|
|
|
Materials
Science |
|
|
|
|
|
Effect of
environment on the mechanical properties of fly ash-jute-polymer composite |
483 |
|
|
|
|
|
|
|
Optical,
electrical and structural studies of nickel-cobalt oxide nanoparticles |
489 |
|
Nisha J Tharayil, R Raveendran, Alexander
Varghese Vaidyan & P G Chithra |
|
|
|
|
|
Thermal,
spectroscopic and electrical transport properties of processable |
497 |
|
poly(aniline-co-alkylaniline)
copolymers |
|
|
|
|
|
|
|
|
A simple way to
predict electric spark sensitivity of nitramines |
505 |
|
|
|
|
|
|
|
511 |
|
|
|
|
|
Annual Index |
|
|
|
|
|
Subject Index |
515 |
|
|
|
|
Author Index |
521 |
Indian
Journal of Engineering & Materials Sciences
Vol.
15, December 2008, pp. 447-451
Order reduction using the advantages of differentiation method and
factor division algorithm
C B Vishwakarm & R Prasad
The authors present a combined method for order reduction of linear dynamic high order systems using the advantages of the differentiation method and factor division algorithm. The denominator of the reduced order model is obtained by the differentiation method and the numerator coefficients of the reduced order model are determined by the factor division algorithm. The reduction procedure is simple and efficient. The proposed algorithm has been extended for the order reduction of linear stable multivariable system. Two numerical examples are solved to illustrate the proposed combined method and integral square error is calculated between original and reduced order models using MATLAB software.
Keywords: Model, Order reduction, Differentiation Method, Factor Division Algorithm, Stability
Indian Journal of Engineering & Materials Sciences
Vol. 15, December 2008,
pp. 452-458
Effect of fibre orientation on stress concentration factor in a laminate with central circular hole under transverse static loading
N D Mittal & N K Jain
The effect of fibre orientation (θ) on stress concentration factor (SCF) in a rectangular composite laminate with central circular hole under transverse static loading has been studied by using finite element method. The percent variations in deflection with fibre orientation are also compared with deflection in laminate without hole. Studies are carried out for three D/A ratios (where D is hole diameter and A is plate width). The results are obtained for four different boundary conditions. Three different types of materials are used for whole analysis to find the sensitivity of stress concentration with elastic constants. A finite element study is made for whole analysis of laminate with a central hole under transverse static loading.
Keywords:
Finite element method, Stress concentration factor, Composite, Laminate,
material properties, Fibre orientation,
Transverse loading
Indian Journal of Engineering & Materials Sciences
Vol. 15, December
2008, pp. 459-466
Computations of flow field over Apollo and OREX reentry modules at high speed
R C Mehta
The paper describes a numerical simulation of the viscous flow past the Apollo and the OREX (Orbital Reentry EXperiments) configurations for freestream Mach numbers range of 1.2-5.0. The flow fields over the reentry module are obtained by solving time-dependent, axisymmetric, compressible Navier-Stokes equations. The fluid mechanics equations are discretized in spatial coordinate employing a finite volume method, which reduces the governing equations to semi-discretized ordinary differential equations. Temporal integration is carried out using a two-stage Runge-Kutta time-stepping scheme. A local time-stepping is used to obtain the steady state solution. The numerical simulation is done on a single-blocked structured grid. The flow field features around the reentry capsules such as bow shock wave, sonic line, expansion fan and recirculating flow in the base-shell region are well captured by the present numerical computation. A low pressure is observed immediately downstream of the base which is characterized by a low-speed recirculating flow region, which can be attributed to fill-up in the growing space between the shock wave and the reentry module. The effects of the module geometrical parameters, such as radius of the spherical cap radius, shoulder radius, cone angle and back shell inclination angle on the flow field, which will provide a useful input for the optimization of the reentry module.
Indian
Journal of Engineering & Materials Sciences
Vol. 15 December 2008, pp. 467-472
Experimental
investigation of tensile behaviour of high strength concrete
Selim Pul
In the design of structures, it is necessary to know about the tensile strength as well as the compressive strength and durability, which are considered to be the most important properties of concrete. In this study, 44-81 MPa high strength concretes are produced. The uniaxial tensile, split tensile and flexural tensile tests are conducted and the relationships between the respective tensile strengths are investigated.
Keywords: High strength concrete, Uniaxial tensile strength, Splitting tensile strength, Flexural tensile strength, Compressive strength.
Indian
Journal of Engineering & Materials Sciences
Vol. 15 December 2008, pp. 473-482
A novel quick response charge pump phase locked loop
B De & B C Sarkar
In this paper a new modification algorithm has been proposed to improve the transient response of the conventional second order CP-PLL system. The performances of the proposed system have been examined by solving the system equations numerically. Some analytical results are incorporated to confirm the performance enhancement of the conventional system by this proposed modified algorithm. Theoretical stability and overload limit are determined. Tracking and noise performances of the modified CP-PLL in the face of noisy input signal are also presented.
Effect of environment on the mechanical
properties of
fly ash-jute-polymer composite
S K Acharya, P Mishra & S C Mishra
The present investigation is aimed at processing a composite using fly ash, jute with epoxy (binder) and to study its weathering behaviour on mechanical properties such as flexural strength. The fracture surfaces of the specimen are examined under scanning electron microscope. From the study, it appears that fiber pullout is the predominant mode of failure. The cracking of the fiber structure is avoided due to adherence of fly ash particles which indicates the increase in strength of interfacial bonding. It can be concluded that this composite can be successfully used as a structural material in household and automobile application and as a low cost building material.
Keyword: Fly ash, Epoxy, Reinforcement, Environment, Flexural
strength
Indian
Journal of Engineering & Materials Sciences
Vol.
15, December 2008, pp. 489-496
Optical, electrical and structural studies of nickel-cobalt oxide nanoparticles
Nisha J Tharayil,
R Raveendran, Alexander Varghese Vaidyan & P G Chithra
Nanoparticles of nickel-cobalt
oxide are prepared by chemical co-precipitation method. The particle size is
determined from X-ray diffraction studies and TEM image. The surface morphology
is revealed by SEM image. The effect of sintering on the particle size is
analyzed. The FTIR studies have been used to confirm the formation of metal
oxide. The characteristic stretching and bending frequencies of the sample is
analyzed. The absorption spectra of the material in the UV-Vis–NIR range are
recorded. An absorption band is observed to occur at 350 nm and another one
around 650 nm. From the analysis of absorption spectra, the nickel-cobalt oxide
(sintered at
Keywords: Nanoparticles, Arrested
precipitation, Calcination temperature, Fourier transform infrared spectrum,
Absorption spectra, Optical band gap, AC conductivity, Dielectric permittivity
Indian
Journal of Engineering & Materials Sciences
Vol.
15, December 2008, pp. 497-504
Thermal, spectroscopic and electrical transport properties of processable poly(aniline-co-alkylaniline) copolymers
Parveen Saini, Hema Bhandari, Veena Choudhary & S K Dhawan
Aniline has been copolymerized in the presence of substituted anilines as comonomers to prepare conducting copolymers of poly(aniline-co-alkylaniline) type, via the chemical oxidative polymerization route. Their thermal stabilities and conductivities are slightly less than pure polyaniline but processabilities have been improved significantly. These copolymers exhibit improved solubility in organic solvents like 1-methyl-2-pyrrolidone (NMP), dimethyl sulpohxide (DMSO), and dimethyl formamide (DMF). Conduction mechanism has been found to be 3-D VRH in case of pure HCl-doped polyaniline and 1-D VRH for copolymers. Coating of these polymers on insulating surfaces can be used for ESD protection and corrosion prevention of iron and mild steel under hostile conditions.
Keywords: Polyaniline, Copolymers, Variable range hopping (VRH), Poly(aniline-co-isopropyl aniline), Poly (aniline-co-2-secbutyl aniline), Conductivity, TGA, FTIR, XRD.
Indian Journal of Engineering & Materials
Sciences
Vol. 15, December 2008, pp. 505-509
A simple way to predict electric spark sensitivity of nitramines
M H Keshavarz, H R Pouretedal & A Semnani
This work presents a new simple method for
predicting electric spark sensitivity of nitramine energetic compounds. This
method is based on the calculated detonation velocity at maximum nominal
density (theoretical maximum density) and then corrected for some nitramines
which have some specific molecular structure. The predicted electric spark
sensitivity by new method are compared with calculated results on the basis of
quantum mechanical computations for 17 nitramines so that the root mean square
(rms) deviations from experiment for new and complicated quantum mechanical
methods are 1.23 and 4.02 J, respectively. The new model is also used for two
new nitamine explosives TNAZ [1,3,3-trinitroazatidine] and
Indian
Journal of Engineering & Materials Sciences
Vol. 15 December 2008, pp. 511-514
Acknowledgement to Reviewers
The Publisher and the Editor of Indian Journal of Engineering & Materials Sciences gratefully acknowledge the honorary services rendered by the following experts in reviewing the papers during 2008.
Agarwal S K
CBRI,
Ahmadi Goodarz
Airey G D
Univ Nottingham,U K
Amirkhania Serji N
Arif Mohammed
AMU,
Atis Cengiz Duran
Bajpai P K
G G Univ,
Banerjee P
IIT,
Banerjee S
IIT,
Banys Juras
Univ Tech,
Barluenga G
Bauhofer W
Tech
Bazant Zdenek
NWETI,
Bellare Jayesh
IIT, Bombay, India
Benini Ernesto
Univ Padava, Italy
Bentz D P
Bhosale C H
Shivaji Univ, Kolhapur, India
Boncia P
Terra Univ, Italy
Ceccarelli Marco
Univ Cassino, Italy
Chakkingal Uday
IIT,
Chang Ta-Peng
Nat
Chaparro Antonio M
CIEMAT, Madrid, Spain
Chatterjee R
IIT,
Chaudhary R N P
IIT,
Chen Y
Australian
Civalek O
Akdeniz Univ,
Danieli G A
Davidson M Joseph
NIT,
Davim J Paulo
Univ Aveiro, Portugal
Dean T A
Dotcheva Marina
Univ Wale Inst,
Dwivedi D K
IIT,
Ellyin F
Fei Sheng-Wei
Franco P
Univ Polytech Cartagena, Spain
Fu Song
Wayne State Univ, USA
Gabrovsek Roman
Nat Inst Chem, Hajdrihova, Slovenia
Galvan Maria Consuelo Alvarez
CSIC,
Gandhi O P
IIT,
Ganesan V
IGCAR,
Gao Feng
NWPU, Xian,
Ghosh Siddhartha
IIT,
Gift S J G
Univ West Indies,
Gorninski J P
Univ Rio, UNISINOS, Brazil
Gupta N
Hossain K M A
Ryerson Univ,
Hu Zhenglong
Huwei Univ,
Huang Shin-Che
Univ
Husain Zahir
RMIT
Iqbal N
Ishikawa Y C
Kyoto Inst
Islam Mazharul
Winsor Univ,
Iyer Nagesh R
SERC,
Jaafar M S
Jagadeesh H S
Jain Jayesh
IIT,
Jain Sanjeev
IIT,
Jain V K
IIT,
James Raju K C
Univ,
Jarali Chetan S
NAL,
Jha R
NIT,
Kang J H
Valeo Electrical System,
Katiyar R S
Univ Puerto Rico, USA
Keller Thomas
Swiss Fed Inst Tech,
Kim Chun-Go
KAIST,
Kim G B
DFC,
Kim Heung Soo
Kotnala R K
NPL,
Kowandy C
Univ Tech Compiegne, France
Kumar D
DCE, Delhi, India
Kus Hulya
Lai Xin Min
Shanghai Jiao Univ, China
Lakshmisha K N
IISc, Bengalore, India
Le Khoa N
Lee E S
Lee Liang-The
Tatung Univ,
Lee Tzen-Chin
Nat United
Lee Yen Jung
Nat Chiao Tung Univ,
Li Liang
NUAA,
Lin Shou-Sheu
Nat Kaohsiung First Univ S
& T,
Lingling Xu
Liu Day Shan
Nat
Liu Xingbo
Liu Xiu-Bo
Zhongyaun Inst
Liu Yong
Lu Xiaohu
Lu Yi
Lu Yun
Lumeau Julien
Univ Central Florida, USA
Ma Z Y
IMR, CAS, Shengang, China
Mahapatra K P Sinha
IIT, Kharagpur, India
Maitra S
WB Univ Tech, Kolkatta
Mann A S
M D Univ,
Martin-Martinez J Ml
Masood S H
Swinburne Univ, Australlia
Mathews Vincent
S T College,
Mayaram Kartikeya
McCarthy M J
Mehta Rajeev
TIET, Patiala, India
Messina M
Mirza J
Res Inst
Mishra P C
Mohanta D K
BIT,
Mukherjee C
CAT,
Murali K R
CECRI,
Murthy V R K
IIT, Chennai, India
Nagar S K
BHU, Varanasi, India
Narayanasamy R
NIT,
Oehring Michael
GKSS Res
Oh Je Hoon
OJha S N
IT, BHU,
Ozyurt Nilufer,
Pal A K
Jadavpur Univ, Kolkata
Pandey Pulak M
HBTI,
Paradkar Archana
DMRL,
Patel Nirmal
Univ North
Pei Z J
Piquet H
Laplace Univ, France
Ponnambalam V
Prakash Chandra
SSPL,
Prasad N Eswara
DMRL,
Prasad S
Patna Univ, Patna, India
Rafiuddin
AMU, Aligarh, India
Rahman M
NUS, Singapore
Raina K K
TIET, Patiala, India
Rajamane N P
SERC, Chennai, India
Rajarajan A K
BARC, Mumbai, India
Ram S
IIT, Kharagpur, India
Ramamurthy K
IIT, Chennai, India
Ramesh K P
IISc, Bangalore, India
Rao K Sambasiva
Osmania Univ, Hyderabad, India
Ravi Shankar B
NIT, Tiruchirappalli, India
Rodopoulos C A
Sheffield Hallam Univ,
Rothberg S J
Loughborough Univ,
Leicestershire,
Rubio J Campos
Federal
Sahoo N K
BARC, Mumbai, India
Saraswathy Velu
Yonsei Univ, Korea
Sasikala G
IGCAR,
Schubert Andreas
Seshadri V
IIT,
Sharma I B
Jammu Univ, Jammu, India
Sharma Seema
M U, Patna, India
Sheeba V S
NIT,
Shokrollahi H
Siddaramaiah
S J College Eng,
India
Sikder A K
HEMRL, Pune, India
Singh I
IIT, Roorkee, India
Singh Parmanand
IIT, Chennai, India
Sinha Mahapatra K P
IIT, Kharagpur, India
Sivakumar Manickam
NIAIST, Nagoya, Japan
Slatineanu Laurentiu
Tech Univ “Gh.Asachi” Lasi, Romania
Song Li
Xiang Univ, Xiang, China
Srinivas V
IIT, Kharagpur, India
Srivastava V C
NML,
Steglich Dirk
GKSS Res
Su R K L
Univ Hong Kong, Hong Kong
Subrahmaniam V
IIT,
Tan Xiao.Yao
Tang Cheng Chun
NIMS,
Teng X
MIT, Cambridge, USA
Thachil E T
CUSAT, Kochi, India
Thakur A K
IIT,
Thakur Sanjay Kumar
DASSPL,
Thiemig Denny
Tech
Tmoko Iswandaru Widya
Scott Wilson,
Tormos B
Univ Politec
Tsimas S
Nat Tech
Veeraiah N
Acharya Nagarjuna Univ, Nuzvid,
India
Veeraragavan A
IIT,
Vikan Hedda
Wang Hao
Wanger H E
Wong Wing-Gun
H K Polytech Univ,
Wong Wing-Gun
Hong Kong
Wu Pu-Wei
Wu Ying
Norwegian Univ S & T,
Xiang Ping Huo
NIAIST,
Xiong G J
Xu Jiuhua
NUAA,
Xue Piang
SINOTECH,
Yadav K L
IIT,
Yan Dongming
Univ Sci & Tech
Yang Chieng-Hsing
Nat
Central South Univ,
Yazici Halit
Dokuz
Ye Jun
College
Ye Qunshan
Da-Yeh Univ,
Zain M F M
Zeman Svatopluk
Zhai Jianping
Zhang Daming
Nanyan Tech
Zhang Julie Z
Univ North
Zhang Yi-He
Tech Inst Phys & Chem,
CAS,
Zoltowski Mariusz