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Search Results: 1 - 10 of 201476 matches for " Amir N "
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Estimation of Nitrogenase Enzyme Activities and Plant Growth of Legume and Non-legume Inoculated with Diazotrophic Bacteria
Salwani S.,Amir, H. G.,Najimudin, N.
Malaysian Journal of Microbiology , 2012,
Abstract: Biological Nitrogen Fixation (BNF) process benefits the agriculture sector especially for reducing cost of nitrogenfertilizer. In the process, the diazotrophs convert N2 into ammonia (NH3) which is useable by plants. The BNF process iscatalysed by nitrogenase enzyme that involved protons and electrons together with evolution of H2 therefore, theassessment of N2 fixation is also available via H2 production and electron allocation analysis. Thus, the aims of thisexperiment were to estimate the nitrogenase enzyme activities and observe the influence of diazothrophs on growth oflegume (soybean) and non legume (rice) plants. Host plants were inoculated with respective inocula; Bradyrhizobiumjaponicum (strain 532C) for soybean while Azospirillum brasilense (Sp7) and locally isolated diazotroph (isolate 5) forrice. At harvest, the plants were observed for plant growth parameters, H2 evolution, N2 fixation and electron allocationcoefficient (EAC) values. The experiment recorded N2 fixation activities of inoculated soybean plants at 141.2 μmol N2 h-1g-1 dry weight nodule, and the evolution of H2 at 144.4 μmol H2 h-1 g-1 dry weight nodule. The electron allocationcoefficient (EAC) of soybean was recorded at 0.982. For inoculated rice plants, none of the observations was successfully recorded. However, results for chlorophyll contents and plant dry weight of both plants inoculated with respective inocula were similar to the control treatments supplied with full nitrogen fertilization (+N). The experiment clearly showed that inoculation of diazotrophic bacteria could enhance growth of the host plants similar to plants treated with nitrogenous fertilizer due to efficient N2 fixation process
A Thought Structure for Complex Systems Modeling Based on Modern Cognitive Perspectives
Kamal Mirzaie,Mehdi N Fesharaki,Amir Daneshgar
International Journal of Computer Science Issues , 2011,
Abstract: One of the important challenges for complex systems modeling is finding an appropriate thought structure for designing and implementing a suitable simulation software. In this paper, we have proposed a suitable worldview for complex systems modeling according to Capra conceptual framework, which is based on modern cognitive theories. With this worldview, the important and fundamental concepts for complex systems modeling are determined. Adding more details to the model that depends on the field of problem, we can simulate a complex system. Also using Popper Three Worlds, the position of this simulation has been described. Following this thought structure, each simulation designer of complex systems can take advantage of modern cognitive theories in modeling.
A community based study of Infant Mortality in rural Aligarh
Shah MS,Khalique N,Amir A
Australasian Medical Journal , 2011,
Abstract: BackgroundInfant mortality rate is regarded as an important andsensitive indicator of the health status of a community. Italso reflects the living standard of the people and theeffectiveness of interventions for improving maternal andchild health. Multiple factors related to social and economicconditions, health care and environment have a significantrole to play on childhood mortality and improving childhoodmortality is a national priority. The present study wasplanned to 1) determine the mortality rate among neonatesand infants. 2) identification of pattern of various factors inrelation to infant mortality and 3) to identify the causes ofdeath in this age group.MethodAll the deaths in children under 12 months during July 2005to June 2006 in Jawan block of district Aligarh, India wererecorded. The cause of death was ascertained using thestandard verbal autopsy procedure.ResultsIn the study period, 446 live births and 37 deaths in childrenunder one year of age were reported. The neonatal andinfant mortality rates were 49.4 and 83.0 per thousand livebirths respectively. The main causes of infant deaths werebirth asphyxia, diarrhoea, pneumonia, prematurity(including Low birth weight and malnutrition).ConclusionMost of the death among infants are preventable, thoughpromotion of institutional deliveries, strengthening of referralsystem, early recognition of danger signs and periodicretraining of health workers.
Exclusive vector meson production at high energies and gluon saturation
Néstor Armesto,Amir H. Rezaeian
Physics , 2014, DOI: 10.1103/PhysRevD.90.054003
Abstract: We systematically study exclusive diffractive (photo) production of vector mesons ($J/\psi$, $\psi(2s)$, $\phi$ and $\rho$) off protons in high-energy collisions and investigate whether the production is a sensitive probe of gluon saturation. We confront saturation-based results for diffractive $\psi(2s)$ and $\rho$ production at HERA and $J/\psi$ photoproduction with all available data including recent ones from HERA, ALICE and LHCb, finding good agreement. In particular, we show that the $t$-distribution of differential cross sections of photoproduction of vector mesons offers a unique opportunity to discriminate among saturation and non-saturation models. This is due to the emergence of a pronounced dip (or multiple dips) in the $t$-distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible $|t|$ that can be traced back to the unitarity features of colour dipole amplitude in the saturation regime. We show that in saturation models the dips in $t$-distribution recede towards lower $|t|$ with decreasing mass of the vector meson, increasing energy or decreasing Bjorken-$x$, and decreasing virtuality $Q$. We provide various predictions for exclusive (photo) production of different vector mesons including the ratio of $\psi(2s)/J/\psi$ at HERA, the LHC, and future colliders.
Diffractive photoproduction of vector mesons at the LHC
Néstor Armesto,Amir H. Rezaeian
Physics , 2014,
Abstract: We confront saturation-based results for diffractive $\psi(2s)$ and $\rho$ production at HERA and $J/\psi$ photoproduction with all available data including recent ones from HERA, ALICE and LHCb, finding a good agreement. We show that the $t$-distribution of differential cross-section of photoproduction of vector mesons offers a unique opportunity to discriminate among saturation and non-saturation models. This is due to emergence of a pronounced dip (or multiple dips) in the $t$-distribution of diffractive photoproduction of vector mesons at relatively large, but potentially accessible $|t|$ that can be traced back to the unitarity features of colour dipole amplitude in the saturation regime. We provide various predictions for exclusive (photo)-production of different vector mesons including the ratio of $\psi(2s)/J/\psi$ at HERA, the LHC and at future colliders.
Violent Crime on American Television: A Critical Interpretation of Empirical Studies  [PDF]
Amir Hetsroni
Sociology Mind (SM) , 2012, DOI: 10.4236/sm.2012.22018
Abstract: This article reviews six decades of studies regarding the presentation of violent crime on American television, and its impact. We critically discuss the major findings and analyze the political-public discourse regarding the macro-social effects of fictional and non-fictional televised violent crime. The claim made here is that this discourse created “too much fuss over not too much blame” in order to mark television as the agent in responsibility for social atrocities.
Efficient Routing of Emergency Vehicles under Uncertain Urban Traffic Conditions  [PDF]
Amir Elalouf
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.53029
Abstract: Emergency-vehicle drivers who aim to reach their destinations through the fastest possible routes cannot rely solely on expected average travel times. Instead, the drivers should combine this travel-time information with the characteristics of data variation and then select the best or optimal route. The problem can be formulated on a graph in which the origin point and destination point are given. To each arc in the graph a random variable is assigned, characterized by the expected time to traverse the arc and the variance of that time. The problem is then to minimize the total origin-destination expected time, subject to the constraint that the variance of the travel time does not exceed a given threshold. This paper proposes an exact pseudo-polynomial algorithm and an ε-approximation algorithm (so-called FPTAS) for this problem. The model and algorithms were tested using real-life data of travel times under uncertain urban traffic conditions and demonstrated favorable computational results.
A CMOS 3.1 - 10.6 GHz UWB LNA Employing Modified Derivative Superposition Method  [PDF]
Amir Homaee
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.43044
Abstract: Low noise amplifier (LNA) performs as the initial amplification block in the receive path in a radio frequency (RF) receiver. In this work an ultra-wideband 3.1 10.6-GHz LNA is discussed. By using the proposed circuits for RF CMOS LNA and design methodology, the noise from the device is decreased across the ultra wide band (UWB) band. The measured noise figure is 2.66 3 dB over 3.1 10.6-GHz, while the power gain is 14 ± 0.8 dB. It consumes 23.7 mW from a 1.8 V supply. The input and output return losses (S11 & S22) are less than –11 dB over the UWB band. By using the modified derivative superposition method, the third-order intercept point IIP3 is improved noticeably. The complete circuit is based on the 0.18 μm standard RFCMOS technology and simulated with Hspice simulator.
A New Approximation to the Linear Matrix Equation AX = B by Modification of He’s Homotopy Perturbation Method  [PDF]
Amir Sadeghi
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2016, DOI: 10.4236/alamt.2016.62004
Abstract: It is well known that the matrix equations play a significant role in engineering and applicable sciences. In this research article, a new modification of the homotopy perturbation method (HPM) will be proposed to obtain the approximated solution of the matrix equation in the form AX = B. Moreover, the conditions are deduced to check the convergence of the homotopy series. Numerical implementations are adapted to illustrate the properties of the modified method.
Prevalence of Campylobacter jejuni in Diarrhea samples in Gorgan , East north of Iran
Ziaei, N.,Amir Mozafari ,N.,Kouhsari ,H.,Moradi , A
Medical Laboratory Journal , 2009, DOI: http://www.goums.ac.ir/mljgoums/index.php?&slct_pg_id=10&sid=1&slc_lang=en
Abstract: Background and Objectives: Diarrhea is one of the most common diseasesin the world. Campylobacter jejuni is one of the prevalent agents of bacterialdiarrhea in most of developing countries. It is usually ignored in routinelaboratory test in our country, because it has a difficult investigation method.This article aims to determine the prevalence of Campylobacter jejuni, indiarrhea samples in Gorgan City (East north of Iran) by PCR Method.Material and Methods: This descriptive study was performed on 455diarrheal samples during one year (2005-06).255 out of them were culturedon Preston media (Himedia co.) on 42°c. DNA Extracted by phenolcholorophorm method was directly carried out on stool samples.16srDNA;hipo and asp primers for detection of Campylobacter genus, C.jejuni andC.coli species were used, respectively. In addition, universal primer of16srDNA was used for control of PCR method.Results: no sample was positive for Campylobacter in culture .only threesamples were positive for Campylobacter genus and C.jejuni specific primerbut none of them were positive for C.coli .99 samples were positive byuniversal primer of 16srDNA .Conclusion: The results indicate that C.jejuni isn't a prevalent agent indiarrhea in our region.Key words: Campylobacter jejuni -Gorgan- Diarrhea
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