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Search Results: 1 - 10 of 461424 matches for " Parvez A "
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Effect of Rotation, Magnetic Field and Initial Stresses on Propagation of Plane Waves in Transversely Isotropic Dissipative Half Space  [PDF]
Sushant Shekhar, Imtiyaz A. Parvez
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A015

The problem regarding the reflection of plane waves in a transversely isotropic dissipative medium is considered, in which we are studying about the reflection of incidence waves in initially stressed dissipative half space. After solving the governing equations, we find the two complex quasi-P (qP) and quasi-SV (qSV) waves. The occurrence of reflected waves is studied to calculate the reflection coefficient and the energy partition of incidence wave at the plane boundary of the dissipative medium. Numerical example is considered for the reflection coefficient and the partition of incident energy, in which we study about the effect of rotation, initial stresses and magnetic field.

Attenuation of P, S and Coda Waves in the NW-Himalayas, India  [PDF]
Imtiyaz A. Parvez, Preeti Yadav, K. Nagaraj
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.31020
Abstract: The frequency-dependent characteristics of P- and S-wave attenuation in the upper crust of NW Himalayas have been estimated using local earthquakes for a frequency range of 1.5 to 18 Hz. A total of 43 local events of magnitude 2.1 - 4.8, mostly from the vicinity of Main Boundary Thrust (MBT) and Main Central Thrust (MCT) have been used in the analysis. The extended coda normalization methods were applied to estimate the quality factors for P- waves (QP) and S-waves (QS) and the single back-scattering model has been used earlier (Kumar et al. [1]) to determine the quality factor for coda waves (QC). The observed quality factors QP and QS is strongly frequency dependent and the estimated average frequency dependent relation is given by QP = (97 ± 3)f (1.06 ± 0.06) and QS = (127 ± 6)f (0.96±0.06) respectively for P- and S-waves. A comparison of QS estimated in this study and QC previously reported shows that QC > QS for entire frequency range. This indicates the enrichment of coda waves and the importance of scattering attenuation to the attenuation of S-waves in the study region infested with faults and fractures. The ratio QS/QP is found to be greater than unity for the entire frequency range indicating that the body waves from source to station paths crossed a crustal volume with dry and rigid rocks. The frequency dependent relations developed in this study can be very useful to ground motion modeling which in turn is required in the seismic hazard assessment of the region.
Characterization of Source Parameters and Some Empirical Relations between Them for Kachchh Region, Gujarat, India: Implication of January 26, 2001 Bhuj Earthquake and Its Aftershock Sequence  [PDF]
Parul C. Trivedi, Imtiyaz A. Parvez
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.610088
Abstract: Study of source parameters of small to moderate and large earthquakes is important to understand the differences and similarities between dynamic ruptures of different earthquakes and clarifying the scaling relations. In the present study, we have characterized source parameters and presented new and revised empirical relationships between various source parameters for Kachchh region of Gujarat, India to facilitate to draw first-order conclusions regarding the trends in the region. We have studied total 202 aftershocks of shallow-focus (hypo central depth less than 40 km) and moderate magnitude recorded over the Kachchh region during January 2001 to December 2012 by different seismological observatories of India Meteorological Department. We have adopted the spectral technique for source parameter estimation, where S-wave displacement spectra are considered and applied Fast Fourier Transform (FFT) to compute displacement spectra. We have followed the Brune’s source model for our estimation and the estimated values of source parameters show close approximation to the global values. While derived empirical relations between different source parameters, they demonstrate direct or inverse proportion to linear or power scale. Interrelation between seismic moment, rupture parameters, corner frequency and radiated seismic energy can be summarized as \"\", \"\", \"\"and ER μ M0
Genetic Analysis of Tassel and Ear Characters in Maize (Zea mays L.) Using Triple Test Cross
Parvez A. Sofi
Asian Journal of Plant Sciences , 2007,
Abstract: The genetic architecture of tassel and ear traits was studied by triple test cross design. Fifteen diverse white maize inbred lines (Four local and 11 exotic) viz., WI-9, W-6, W-7, GLET-7, GLET-27, CML-77, CML-79, CML-111, CML-38, CML-173, CML-213, CML-214, CML-240, CML-244 and 463 were crossed with three testers W3, 5 and W3x5. The test crosses were generated in 2004 at winter maize nursery, Amberpet (Hyderabad). The parental lines, testers and crosses were evaluated at two diverse locations of Kashmir valley viz., Larnoo and Wadura in RBD with three replications at each location. Analysis of variance for detection of epistasis revealed significant epistasis as well as its components for all traits except tassel branch number and ear length for which additive interaction was non-significant. The epistasis as well its components interacted significantly with environment except for tassel length where interaction component was non-significant. The estimates of genetic components of variance revealed that both additive and dominance components were significant for all traits except ear diameter where dominance component was non-significant. The correlation between tassel and ear traits revealed strong correlation between tassel branch number and ear height (0.72%) followed by tassel branch number and ear length (0.548), tassel length and tassel weight (0.416). Negative correlation was recorded between tassel length and weight with ear length. Selecting for upright tassel branches may compensate for yield reduction without comprising on tassel size to ensure sufficient pollen availability, especially in hybrid seed production and stress environments.
A Preliminary Study on Rainfall Pattern before and after the January 26, 2001 Bhuj Earthquake (Mw 7.7) over Kachchh Region of Western Peninsular, India  [PDF]
Parul C. Trivedi, H. P. Joshi, Imtiyaz A. Parvez
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.510092
Abstract: Under the influence of great debate on relation between earthquake and rainfall, some scientists have carried out detailed study and now commonly accepted that heavy rainfall can trigger earthquake at the faults or fractures depending upon the local geology. Here, an attempt is made to check relation between earthquake and rainfall with different scientific approaches. We have attempted to critically examine the relation between the Bhuj earthquake-aftershocks sequence and the rainfall pattern over the region as large earthquake (Mw 7.7) has occurred on January 26, 2001 in Kachchh region of western peninsular shield of India and the aftershocks are being reported till the date. We have analyzed rainfall data for 20 years, i.e. 10 years before and 10 years after the main shock of January 26, 2001, recorded by three meteorological observatories in the Kachchh region. We have studied annual total rainfall for two decades, annual rainfall departures from the climate normals, number of rainy days and number of heavy rainfall days during the period for all the three meteorological observatories of Kachchh region. We have found significant increase in all the measured rainfall parameters i.e. annual total rainfall, number of rainy days and number of heavy rainfall days over the Kachchh region during last decade i.e., from 2001 to 2010 after the main shock. Numbers of negative departures have been decreased during the last decade compared to previous decade. Thus rainfall pattern over Kachchh region is being changed. This increase in rainfall activity over Kachchh region may have been influenced by large earthquake and continuing aftershock activities over the region.
Recognition of Earthquake-Prone Areas in the Himalaya: Validity of the Results
A. Gorshkov,I. A. Parvez,O. Novikova
International Journal of Geophysics , 2012, DOI: 10.1155/2012/419143
Abstract: In 1992 seismogenic nodes prone for earthquakes have been recognized for the Himalayan arc using the pattern recognition approach. Since then four earthquakes of the target magnitudes occurred in the region. The paper discusses the correlation of the events occurred in the region after 1992 with nodes previously defined as having potential for the occurrence of earthquakes . The analysis performed has shown that three out of four earthquakes occurred at recognized seismogenic nodes capable of .
Recognition of Earthquake-Prone Areas in the Himalaya: Validity of the Results
A. Gorshkov,I. A. Parvez,O. Novikova
International Journal of Geophysics , 2012, DOI: 10.1155/2012/419143
Abstract: In 1992 seismogenic nodes prone for earthquakes have been recognized for the Himalayan arc using the pattern recognition approach. Since then four earthquakes of the target magnitudes occurred in the region. The paper discusses the correlation of the events occurred in the region after 1992 with nodes previously defined as having potential for the occurrence of earthquakes . The analysis performed has shown that three out of four earthquakes occurred at recognized seismogenic nodes capable of . 1. Introduction Accurate definition of potential earthquake sources plays a main role on the development of seismic hazard assessment regardless of the applied methodology, either probabilistic or deterministic. In this paper, we analyze the results of the work by Bhatia et al. [1] dedicated to identification of earthquake-prone areas in the Himalaya. The work was carried out in 1992. Number of seismogenic nodes prone to M6.5+ have been defined in the region using pattern recognition approach [2, 3]. This methodology is based on the idea that large earthquakes correlate with morphostructural nodes, specific structures formed at the intersections of fault zones. The fact that earthquakes nucleate at nodes was first established for the Pamirs and Tien Shan regions [2].The role of intersecting faults in the control of earthquake origin was later observed in different tectonic settings by other researchers. Specifically, Talwani [4, 5] found that large intraplate earthquakes are related to intersections and demonstrated that intersecting faults provide a location for stress accumulation. Hudnut et al. [6] and Girdler et al. [7] observed the relationship between earthquakes and intersections for plate boundaries and rift structures, respectively. According to King [8], fault intersections provide locations for initiation and healing of ruptures. Apart from the Himalaya, seismogenic nodes for different target magnitudes have been previously recognized in many seismic regions of the world (e.g., [9–12]). After 1992 four earthquakes with occurred in the Himalaya. The goal of this paper is to demonstrate how these events correlate with seismogenic nodes prone to M6.5+ defined in [1]. 2. Recognition of Seismogenic Nodes in the Himalaya In this section we briefly introduce the basic postulates of the methodology used by Bhatia et al. [1] for identification of earthquake-prone areas in the Himalaya. The methodology includes two main steps. The first step is the determination of the morphostructural nodes to be regarded as recognition patterns, using the MZ method [3]. The
Tuberculosis: Laboratory Diagnosis and Dots Strategy Outcome in an Urban Setting: A Retrospective Study  [PDF]
Nazish Fatima, Mohammad Shameem, Fatima Khan, Indu Shukla, Parvez A. Khan,   Nabeela
Journal of Tuberculosis Research (JTR) , 2014, DOI: 10.4236/jtr.2014.23013
Abstract: Pulmonary Tuberculosis (TB) is a global public health threat. It has a worldwide distribution with a very high prevalence in Asian countries. A correct diagnosis forms an important and indispensable part of proper and timely treatment. Detection of acid fast bacilli in direct smears has considerable clinical and epidemiological value and remains the most widely used rapid diagnostic test. In smear negative cases, radiography has an important role to play. Directly Observed Treatment Short Course (DOTS) strategy is one of the most cost-effective health interventions to treat tuberculosis. Samples from clinically suspected cases of TB were screened for the presence of Acid Fast Bacilli (AFB). Radiography and culture was done for the AFB negative cases. 760 cases of pulmonary TB were diagnosed by smear examination and 412 by radiography. 270 cases of pulmonary TB were diagnosed in the study. Of the 1422 patients put on DOTS, out of which 1138 (80.1%) were successfully treated. Thus, smear examination for AFB and radiography should go hand in hand for correct diagnosis and treatment of TB by DOTS which is a very successful regimen for developing countries like India.
Wind Power Technology Schemes as Renewable Energy in Bangladesh
M. A. Parvez Mahmud,Shahjadi Hisan Farjana
International Journal of Engineering and Advanced Technology , 2012,
Abstract: Wind energy is one of the renewable means of electricity generation that is a part of the worldwide discussion on the future of energy generation and use. Usage of wind energy has been increased in recent times especially because it is a running demand to use alternative energy sources and reduce fossil fuels consumption. This paper presents the schemes to use this technology in Bangladesh because it has a 724 km long coastline and many small islands in the Bay of Bengal, where strong southwesterly wind and sea breeze blow in the summer season and there is gentle northeasterly wind and breeze in winter months. It could produce 2,000 MW of power in the coastal belt installing 30 windmills per square km. The windmills that can be installed in the coastal belts can sustain 250 km per hour cyclonic storm. The scope of setting large scale power plant in coastal areas will be discussed in this paper.
Effect of Auxin Precursor (L-Tryptophan) on the Growth and Yield of Tomato (Lycopersicon esculentum)
M. A. Parvez,Faqir Muhammad,Mumtaz Ahmad
Pakistan Journal of Biological Sciences , 2000,
Abstract: Studies were conducted to observe the effect of L-tryptophan on growth and yield of tomato. It has been concluded that L-tryptophan improved the vegetative and reproductive growth of tomato. Higher concentrations of L-tryptophan i.e., 10-4 ML-1 and 10-5 ML-1 were found much suitable to boost up stem height, number of leaves per plant. Lower concentrations of L-tryptophan i.e., 10-2 ML-1 and 10--3ML-1 were found favourable to improve reproductive characters i.e., number of trusses, fruits per truss and per plant, weight of fruit and number of seeds. TSS was lowered with the application of the chemical and ascorbic acid was enhanced with 10-4 ML-1 concentration of L-tryptophan.
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