Showing papers by "Thapar University published in 2003"
TL;DR: In this paper, the results of an experimental investigation carried out to evaluate the mechanical properties of concrete mixtures in which fine aggregate (sand) was partially replaced with Class F fly ash by weight.
268 citations
TL;DR: Sequence data of the ITS region of ribosomal DNA supported the identity of the present fungal isolates as P. capitalensis, an ubiquitous foliar endophyte that can infect tree hosts from different families and habitats.
68 citations
TL;DR: In this paper, the role of substitution of Nd3+ and Sm3+ on the magnetic properties of anisotropic strontium ferrite sintered magnets was described.
58 citations
50 citations
TL;DR: In this paper, a theoretical model is developed to study the performance of a hole-entry hybrid journal bearing system by considering variation of viscosity due to temperature rise of the lubricant in the analysis.
33 citations
TL;DR: Crop profile microclimatic conditions and the resulting growth responses of the intercropped wheat were studied to explore the potential of agroforestry systems to influence late sown wheat yields under different tree row spacing and orientations.
Abstract: The presence of trees in fields may help overcome the physiological stress that happens to late sown wheat (Triticum aestivum L.) in subtropical India. Wheat was planted in an agroforestry system with Eucalyptus tereticornis trees on 7 January 1998 in a fan design that provided different combinations of tree row spacing and orientations. Crop profile microclimatic conditions and the resulting growth responses of the intercropped wheat were studied to explore the potential of agroforestry systems to influence late sown wheat yields under different tree row spacing and orientations. Agroforestry treatments exhibited a potential to optimize the microclimatic conditions for seedling emergence, tillering and earhead emergence at some tree row orientations and distances from the crop. The net radiation distribution at three stages of crop growth indicated that the radiation availability was lower in all the agroforestry treatments than for the sole crop. The tree row orientation and distance influence the growth behavior of the crop but the effect of sun angle (which changes with season) can change their influence over time. The deterioration or amelioration of microclimatic conditions in agroforestry with the passage of time should be expected because of altered interaction patterns between sunrays and tree canopy resulting from changing solar elevation and angle of sunrays. Statistically similar harvest indices in all the treatments despite lower total biological yields in agroforestry treatments revealed that microclimatic conditions under agroforestry were more favorable for wheat growth attributed to reduction in heat load during the post anthesis period.
31 citations
TL;DR: In this paper, the aging process caused a slow transformation of lath martensite into acicular ferrite due to occurrence of in situ recrystallization, and the concentration of Cu in particles precipitating on aging was followed using EDAX technique.
Abstract: Investigations were carried out on aging of a HSLA-100 steel after varying amounts of cold deformation Mechanical properties (hardness, tensile properties and toughness) were measured and structural changes were studied using optical, TEM and SEM techniques As a result of various treatments, the hardness and UTS could be significantly improved, but with drastic fall in ductility and impact strength, especially in peak aged conditions The parameters affecting impact strength were examined and it was concluded that various microstructural features affected toughness through their influence on tensile properties In this steel the impact strength could be improved by lowering the UTS and increasing the ductility (pct elongation) The improvement in hardness and UTS was attributed to formation of thick precipitate-dislocation tangles The aging process caused a slow transformation of lath martensite into acicular ferrite due to occurrence of in situ recrystallization The concentration of Cu in particles precipitating on aging was followed using EDAX technique
20 citations
TL;DR: In this paper, a room temperature ferroelectric liquid crystal mixture was dispersed in UV curable polymers of different viscosity in 30:70 wt/wt ratio.
19 citations
TL;DR: The results indicate that the work that has been carried out to transmit ECGs from remote sites is suitable for telecardiology and can form part of an overall telemedicine system in a health care network.
Abstract: Continuous monitoring of the electrocardiogram (ECG) and other signals related to current heart activity are necessary for patients who are suffering from cardiac diseases. This paper deals with the work that has been carried out to transmit ECGs from remote sites. Software has been developed which enables the uploading of ECG data from a patient so that the physician can monitor the state of the patient from a distance and at the same time may consult other experts for a second opinion. Records can only be examined by the authorized physician after proper registration and diagnosis or prescription may be sent back to the referring site. Further consultation with the patient through a 'chat' facility is also possible. The suitability of the system over transport control protocol (TCP), internet protocol (IP), local area network (LAN), wide area network (WAN) and World Wide Web (WWW) has been assessed. The bandwidth, latency, availability, security and ubiquity have also been discussed. A study has also been undertaken in order to make the system compatible with available bandwidths and to find out which one out of a number of available techniques is most efficient for ECG data compression. The results indicate that the scheme is suitable for telecardiology and can form part of an overall telemedicine system in a health care network.
16 citations
TL;DR: In this article, the stability margin of a constant flow valve compensated hole-entry hybrid journal bearing system considering the variation of viscosity due to temperature rise of the lubricant was investigated.
Abstract: The present study describes the theoretical investigation into the stability margin of a constant flow valve compensated hole-entry hybrid journal bearing system considering the variation of viscosity due to temperature rise of the lubricant. The journal temperature is computed on the basis of average fluid-film temperature. The relevant governing equations are solved using a finite element method and a suitable iterative technique. The thermohydrostatic performance of symmetric and asymmetric hole-entry hybrid journal bearing configurations are studies. The results presented in the study indicate that the variation of viscosity due to temperature rise of the lubricant fluid-film affects the performance of hole-entry hybrid journal bearing system quite significantly.
16 citations
TL;DR: In this article, Ferroelectric liquid crystal polysiloxane composite films were prepared after dissolving them in diethyl ether as a solvent and crosslinking was done by adding room temperature vulcanizer (mixture of tetra ethoxy silane and dibutyl tin dilaurate) as curing agent.
Abstract: Ferroelectric liquid crystal–polysiloxane composite films were prepared after dissolving them in diethyl ether as a solvent. The crosslinking was done by adding room temperature vulcanizer (mixture of tetra ethoxy silane and dibutyl tin dilaurate) as curing agent. These composite films show good electro-optic properties with switching times on the order of few milliseconds. The preliminary results show that these systems can be useful as functional materials in electronic displays. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1209–1215, 2003
TL;DR: The textural and electrooptical behavior of a nematic liquid crystal (LC) dispersed in a flexible and rigid polyester was studied in this article, where it was observed that the transmission of light and the dispersion of LC maximizes their respective values at the minimum molecular weight irrespective of the nature of the polymer and at the maximum voltage.
Abstract: The textural and electrooptical behavior of a nematic liquid crystal (LC) dispersed in a flexible and rigid polyester was studied. The dispersion of LC in the polymer matrix and light transmission through the polymer-dispersed liquid crystal (PDLC) is governed by the nature of the polymer, its molecular weight, and the applied voltage. It was observed that the transmission of light and the dispersion of LC maximizes their respective values at the minimum molecular weight irrespective of the nature of the polymer and at the maximum voltage. The reason is the predominance of chain alignment over entanglement at the minimum molecular weight. As molecular weight increases, the transmission of light as well as the dispersion of LC in the polymer may increase or decrease depending on the predominance of chain entanglement or chain alignment. The alignment of LC droplets in the direction of the applied voltage is increased by an increase in the applied voltage, causing enhancement of the light transmission. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 284–289, 2003
TL;DR: In this article, a newly synthesized low molar mass liquid crystal having a flexible mesogenic group attached to methylene siloxane exhibiting smectic A phase has been used as a host for 2% (wt/wt.) dichroic dyes.
20 Oct 2003
TL;DR: Experimental results show that the quantum search algorithms are more efficient than classical algorithms and can be applied with more efficiency on a quantum computer.
Abstract: We present a quantum search algorithm for automated test pattern generation (ATPG) of combinatorial VLSI circuits. This problem can be viewed as an optimization problem because digital circuits can be modeled as a neural network and the problem become to minimize the energy function of this neural network. The solution of the equation gives us the test vector. Here specific aspects of quantum theory like superposition and quantum parallelism are applied to this problem. In quantum search algorithm this problem is viewed as a searching problem where the search function (also called oracle) f(x)=1 if the value of the energy function of the neural network is 0 otherwise f(x)=0. Quantum mechanics help us to search a group of items simultaneously from the search space rather than one item at a time. The algorithm is so efficient that it requires only, on average, roughly /spl radic/N (where N is the total number of vectors) searches to find the desired test vector, as opposed to a search in classical computing, which on average needs N/2 searches. A comparison is made between exhaustive, simulated annealing and quantum based search techniques. Experimental results show that the quantum search algorithms are more efficient than classical algorithms and can be applied with more efficiency on a quantum computer.
TL;DR: Experimental results show that the quantum search algorithms are more efficient than classical algorithms and can be applied with more efficiency.
Abstract: This paper presents a quantum search algorithm for Automated Test Pattern Generation (ATPG) of VLSI circuits. For given digital circuits, a neural network is created that represents the digital gates with their interconnections as neurons. This neural network is characterized by an energy function E, which is the mathematics representation of neural network. The solution of the energy function gives us the test vector. The test vector is a combination of input values of digital circuits that detects a particular fault. In this paper, specific aspects of quantum theory like superposition and quantum parallelism are applied to find the solution of this energy function. The algorithm developed is so efficient that it requires only (where N is the total number of vectors) iterations to find the desired test vector whereas in classical computing, it takes N/2 iterations. At the end, a comparison is made between exhaustive, simulated annealing and quantum based techniques. Experimental results show that the quantum search algorithms are more efficient than classical algorithms and can be applied with more efficiency.
TL;DR: In this paper, the effect of different dopant concentrations on the phosphorescence excited-state life times of zinc sulphide phosphors has been investigated and the decay-curve analysis has been done.
Abstract: Zinc sulphide phosphors, doped with Ba and Mg as well as killer impurities of Fe, Co and Ni having variable concentrations have been synthesized and then using ultraviolet laser (Nitrogen Laser) as the excitation source, their decay-curve analysis has been done. Various strong emissions have been detected and the corresponding excited state lifetimes are measured at room temperature. Studies have also been carried out to see the effect of different dopant concentrations on the phosphorescence excited-state life times.
01 Nov 2003
TL;DR: In this paper, it was proved that the complex double Fourier series of an integrable function f(x, y) with coefficients cjk satisfying certain conditions, will converge in L 1-norm.
Abstract: It is proved that the complex double Fourier series of an integrable functionf(x, y) with coefficients cjk satisfying certain conditions, will converge in L1-norm. The conditions used here are the combinations of Tauberian condition of Hardy-Karamata kind and its limiting case. This paper extends the result of Bray [1] to complex double Fourier series.
TL;DR: The oxazastibinanes 3 have been synthesized by the sodium borohydride reduction of 3-phenyl-1-arylamino-3-oxopropane (1) and subsequent cyclization of the disodium salt with R3SbBr2 (R = Ph, p-tolyl, or mesityl) as discussed by the authors.
Abstract: The hitherto unreported oxazastibinanes 3 have been synthesized by the sodium borohydride reduction of 3-phenyl-1-arylamino-3-oxopropane (1) and subsequent cyclization of the disodium salt of 3-phenyl-1-arylamino-3-hydroxypropane (2) with R3SbBr2 (R = Ph, p-tolyl, or mesityl). These compounds have been characterized by elemental analyses, molecular weight determination, and by IR, far IR, 1H, and 13C NMR spectral studies. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:417–420, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10155
01 Jan 2003
TL;DR: The use of adaptive antennas in reducing radiation hazards is discussed and the effect of R.F on human brain is analyzed by taking a simple model of head.
Abstract: The application of adaptive antennas to wireless communication has shown to offer wide range of benefits like increased coverage and spectral efficiency, elimination of co-channel and multipath interference etc. In this paper the use of adaptive antennas in reducing radiation hazards is discussed. The adaptive antenna at the handset constantly forms a broad null towards the user head. The effect of R.F on human brain is analyzed by taking a simple model of head. The power absorbed and rise in temperature of various tissues of head is compared for omni directional as well as adaptive antenna. In determining the temperature rise the effect of blood flow and transfer of heat from tissue into space is taken into account.
01 Jan 2003
TL;DR: In this paper, the effect of high frequencies on human head has been discussed by taking a simple model of head i.e. by considering it to be a stack of skin, bone, fat, muscle and brain.
Abstract: Wireless communication is experiencing the fastest growth in the period of history. The next generation mobile services will offer variable bandwidth, desktop/multimedia with mobility and service personalization. To enable this, new technologies and systems is put in use viz; wideband receivers, advanced power amplifiers, advanced modems, adaptive antenna systems, space time coding techniques, radio resource management etc. The spatial processing is considered to be the last frontier in the battle of improved cellular system technology and smart antennas is emerging as the enabling technique that exploits available resources of the physical layer. The application of adaptive techniques to wireless communication has been shown to offer wide range of benefits including interference rejection, increased coverage and spectral efficiency. The use of adaptive antenna at handset can help in eliminating co-channel interference (CCI), multi-access interference (MAI), multipath fading and other effects has been discussed in various papers. In this paper the use of adaptive antennas in reducing radiation hazards has been discussed. The effect of high frequencies on human head has been discussed by taking a simple model of head i.e. by considering it to be a stack of skin, bone, fat, muscle and brain. The power reaching various tissues of the head has calculated by first considering an omni directional antenna. Next, the power reaching brain by use of adaptive antenna at handset is found. The adaptive antenna is adaptively forming a broad null in the direction of head. The power radiated by adaptive antenna towards head is very small as compared to omni directional antenna. The power absorbed by various tissues of head viz, skin, bone, fat, muscle and brain has been compared for omni directional as well as adaptive antenna. The study has been made at in the range 1 MHz to 10 GHZ. It has been found as frequency increases less power reaches brain. From the model developed it is found that from 1 GHz to 6 GHz, the human head absorbs about 47% of the power. Further it is shown that 6% of the incident power is reaching brain at 1900 MHz as compared to 13% at 900 MHz. At 6 GHz only 0.04% of the incident power is reaching brain. By using adaptive antenna at die handset decreases the power radiated towards human head thereby decreasing the power absorbed by head as now less power is directed towards human head.
TL;DR: The 4-oxo-1,3,2-benzoxazastibinines 2 have been synthesized by the cyclization of disodium salt of salicylanilide (1) with Ar3SbBr2 (Ar = Ph, p-tolyl, or mesityl) as discussed by the authors.
Abstract: The hitherto unreported 4-oxo-1,3,2-benzoxazastibinines 2 have been synthesized by the cyclization of disodium salt of salicylanilide (1) with Ar3SbBr2 (Ar = Ph, p-tolyl, or mesityl). These compounds have been characterized by elemental analyses, molecular weight determination, and by IR, far IR, 1H, and 13C NMR spectral studies. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:622–624, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10202
TL;DR: In this article, adolescent boys and girls were compared with middle-aged men and postmenopausal women on their performance on 3D space perception test and found that adolescent boys performed significantly better compared to girls.
Abstract: Adolescent boys and girls were compared with middle-aged men and postmenopausal women on their performance on 3-dimensional space perception test. Results indicate that sex difference was evident only for the adolescent group and not for the middle-aged. Adolescent boys performed significantly better compared to girls. Age difference on spatial task performance was obtained only for males and not for females where postmenopausal women outperformed adolescent girls. Findings are explained in terms of progressive hemispheric lateralization and psychological differentiation across the life span.
TL;DR: The oxazastibinanes 3 have been synthesized by the sodium borohydride reduction of 3-phenyl-1-arylamino-3-oxopropane (1) and subsequent cyclization of the disodium salt with R3SbBr2 (R = Ph, p-tolyl, or mesityl) as mentioned in this paper.
Abstract: The hitherto unreported oxazastibinanes 3 have been synthesized by the sodium borohydride reduction of 3-phenyl-1-arylamino-3-oxopropane (1) and subsequent cyclization of the disodium salt of 3-phenyl-1-arylamino-3-hydroxypropane (2) with R3SbBr2 (R = Ph, p-tolyl, or mesityl). These compounds have been characterized by elemental analyses, molecular weight determination, and by IR, far IR, 1H, and 13C NMR spectral studies. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:417–420, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10155