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Frequency of Placenta Previa and Maternal Morbidity Associated with Previous Cesarean Delivery  [PDF]
Anisodowleh Nankali, Farahnaz Keshavarzi, Atefeh Shajari, Sara Daeichin
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.414127
Abstract: Background: Placenta previa (P.P) is a rare pregnancy complication where a placenta particularly or completely covers the internal cervical os thereby preventing normal vaginal delivery. This study was conducted to evaluate the relationship between repeated cesarean deliveries and subsequent development of placenta previa. Methods & Materials: This cross-sectional study was held in Imam Reza Hospital Kermanshah-Iran during 2008-2011. This study included all pregnant women with repeated cesarean sections while nullipara and patients with placenta previa without previous surgery were excluded. Diagnosis was made on ultrasound and at surgery. Results: among 2696 Women, 98 cases had P.P (3.63%). The mean age was 30 years, 76.5% (75 cases) had gravidity 2 and 3 and 87.8% (86 cases) had parity 1 - 3. Anterior location of placenta was 44.9% while posterior was 55.1%. 48% were complete P.P, 32.7% low lying P.P, 13.3% marginal P.P, and 6% Partial P.P. 26.5% of patients had history of abortion. 55.1% of patients had male fetus. There was an increase in frequency of placenta previa with just one previous C-section (74.5%). Frequency of accreta P.P 32% (n = 7), increta (14.3%, n = 3) and percreta 28% (n = 6). Among those who underwent emergency hysterectomy (21 cases) 23.8% cases had no abnormal placentation. 30.6% of newborns had birth weight < 2500 g. Conclusion: we concluded that patients with history of one pervious cesarean delivery had more Placenta previa and need to hysterectomy were more than those with history of 2 and 3 previous cesarean delivery. The most common type of abnormal placentation was accreta, percreta and increta respectively.
Misleading Communication VS. Effective Aviation Management  [PDF]
Keshavarzi Zahra
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.36029
Abstract: In this paper some of the important problems and issues such as human and communication errors in safety and civil aviation management are presented. The problems arise from misleading information from different sources. To avoid the above problems, a centralization of the information is proposed here. To centralize the information for Air Traffic Management (ATM), a mining data routing system called SCADA (Supervisory Control and Data Acquisition) system is suggested in this study. The utilization of SCADA system will helps to capture air traffic information and aircraft data via satellite technology and transfer it to data mining center and then to central organization. The stored digital data will exchange the information between different organizations and will be used by management systems. The stored reliable information helps to make an appropriate decision in the Air Traffic Management system.
Pleuropulmonary Blastoma in Children: A Case Report
Azamsadat Hashemi,Azadeh Souzani,Amineh Souzani,Sara Keshavarzi
Iranian Journal of Cancer Prevention , 2012,
Abstract: Pleuropulmonary Blastoma [PPB] is a very rare, highly aggressive and malignant tumor that originates from either the lungs or pleura. It occurs mainly in children aged less than five or six years. It has poor prognosis with three different subtypes: cystic [type I], combined cystic and solid [type II] and solid [type III]. PPB is treated with aggressive multimodal therapies including surgery and chemotherapy. We present a case of 3.5 years old boy with PPB type II successfully treated with complete surgical resection followed by neoadjuvant chemotherapy.
Harmonicity and Minimality of vector fields on four-dimensional Lorentzian lie groups
Yadollah Keshavarzi
Mathematics , 2014,
Abstract: We consider four dimensional lie groups equipped with left invariant Lorentzian Einstein metrics, and determine the harmonicity properties of vector fields on these spaces. In some cases, all these vector fields are critical points for the energy functional restricted to vector ?fields. We also classify vector fields defining harmonic maps, and calculate explicitly the energy of these vector fields. Then we study the minimality of critical points for the energy functional.
Some geometrical properties of Berger Spheres
Y. Keshavarzi
Mathematics , 2014,
Abstract: Our aim in this paper is to investigate some geometrical properties of Berger Spheres i.e. homogeneous Ricci solitons and harmonicity properties of invariant vector ?fields. We determine all vector ?fields which are critical points for the energy functional restricted to vector ?fields. We also see that do not exist any vector ?fields defining harmonic map, and the energy of critical points is explicitly calculated.
Application of Artificial Neural Network, Kriging, and Inverse Distance Weighting Models for Estimation of Scour Depth around Bridge Pier with Bed Sill  [PDF]
Homayoon Seyed Rahman, Keshavarzi Alireza, Gazni Reza
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.310112
Abstract: This paper outlines the application of the multi-layer perceptron artificial neural network (ANN), ordinary kriging (OK), and inverse distance weighting (IDW) models in the estimation of local scour depth around bridge piers. As part of this study, bridge piers were installed with bed sills at the bed of an experimental flume. Experimental tests were conducted under different flow conditions and varying distances between bridge pier and bed sill. The ANN, OK and IDW models were applied to the experimental data and it was shown that the artificial neural network model predicts local scour depth more accurately than the kriging and inverse distance weighting models. It was found that the ANN with two hidden layers was the optimum model to predict local scour depth. The results from the sixth test case showed that the ANN with one hidden layer and 17 hidden nodes was the best model to predict local scour depth. Whereas the results from the fifth test case found that the ANN with three hidden layers was the best model to predict local scour depth.
Experimental Study of the Effects of Submerged Dikes on the Energy and Momentum Coefficients in Compound Channel  [PDF]
Alireza Keshavarzi, Mehdi Valizadeh, James Ball
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.211108
Abstract: This paper aims to understand the flow structure around submerged dike in the main channel and flood plain of a compound cross section. The study undertaken to develop this understanding was carried out in a laboratory flume using a submerged vane installed at a 90 degree angle to the bank. In order to study the flow structures, the flow velocity was measured using a three-dimensional Acoustic Doppler Velocity meter (micro-ADV) with data collection rate of 50 Hz. These flow velocity measurements were taken at 500 points on a regular grid. As the tests were undertaken with turbulent flow, these conditions were subcritical. Furthermore, all the tests were undertaken using a fixed bed. The results obtained showed that the momentum transfer and the kinetic energy reduced in two directions. Also the energy and momentum coefficients decreased significantly with the installation of the submerged vane inside the main channel. Finally, streamlines were found to deviate from the side walls of channel into the main channel.
Systematic Study of Weedy Species of Setaria (L.) P. Beauv. (Poaceae) in Iran
Maryam Keshavarzi,Mahvash Seifali
Pakistan Journal of Biological Sciences , 2007,
Abstract: Weedy species of Setaria (L.) P. Beauv. (Poaceae, Panicoiodeae and Paniceae) compose one of the worst weed groups interfering with world agriculture and in other disturbed and managed habitats. These weed species (S. glauca, S. viridis and S. verticillata) form the foxtail species-group in Iran. In this study 30 populations from different part of Iran were collected. Morphological traits were studied. Some morphological characters as texture of upper lemma, awn color and ligule shape are used to differentiate Setaria species group in Iran. It is believed that these morphological traits have a lot of overlapping. Morphological variations were evaluated by multivariate statistical methods. This study shows the systematic value of different quantitative and qualitative characters in weedy Setaria species native to Iran. An identification key based on studied characters is provided.
Morphological Study of Salicornieae (Chenopodiaceae) Native to Iran
Golshan Zare,Maryam Keshavarzi
Pakistan Journal of Biological Sciences , 2007,
Abstract: The tribe Salicornieae Dum. belonging to the subfamily Salicornioideae Kostel (Chenopodiaceae Vent.) includes halophyte plants. These 5 genera and 6 species are distributed in different habitats of Iran. Members of this tribe have reduced vegetative parts, scale like leaves and articulated stems. In this study quantitative and qualitative morphological characters for 46 accessions of Salicornieae were evaluated. Vegetative characters are not sufficient to distinguish these taxa. Our results indicated that vegetative form, globular buds, plant color, stem base disarticulation and presence of node at the base of inflorescence are diagnostic character in this tribe. Besides floral arrangement in inflorescences, bracts shape, color and shape of seeds are important key features in members of Salicornieae in Iran. Seed coat ornamentations and its hairs and color are found to be helpful in distinguishing these taxa. Quantitative characters show variation too, but as they were not significant, they can not help to resolve the taxonomic problems of this tribe in Iran. Based on studied morphological characters, an identification key for members of this tribe in Iran is provided.
The Effect of Drought Stress on Germination and Early Growth of Sesamum indicum Seedling’s Varieties under Laboratory Conditions
Mohammad Hossein Bijeh keshavarzi
International Journal of Agricultural Management and Development , 2012,
Abstract: Environmental stresses specially drought, play an importantrole in decreasing plant growth, particularly during germinationin dry and semi dry area. To considering the effect of droughtstress caused by polyethylene glycol on germination and characteristicsof 2 spices of Sesamum indicum, we had done factorialand complete accidental plot with 4 treatments and 3 timesrepetition. Experimental treatments included osmotic potentialin 4 levels (0, -4, -6, -10 bar) which was produced by polyethyleneglycol 6000 and 2 sesame species (Safi Abadi and Dezfol). Alldata had been analyzed by SAS software and comparison ofmeans had been done by Duncan test at 5% probable level. Theresults showed that, percentage and speed of all spices' germinationdecline by osmotic potential enhancement. Other measured parameterssuch as radicle and coleoptile length, dry and wetweight declined by increasing osmotic potential as well.
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