نتایج جستجو برای: and latitude 29 50 during 2003
تعداد نتایج: 17128212 فیلتر نتایج به سال:
investigating the feasibility of a proposed model for geometric design of deployable arch structures
deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
Rapidly moving transient features have been detected in magnetic and Doppler images of super-active region NOAA 10486 during the X17/4B flare of October 28, 2003 and the X10/2B flare of October 29, 2003. Both these flares were extremely energetic white-light events. The transient features appeared during the impulsive phase of the flares, and moved with speeds ranging from 30 to 50 km/s. These ...
[1] We present a long-term study, from January 1996 to August 2012, of the latitude of the Heppner-Maynard Boundary (HMB) measured at midnight using the northern hemisphere Super Dual Auroral Radar Network (SuperDARN). The HMB represents the equatorward extent of ionospheric convection and is used in this study as a measure of the global magnetospheric dynamics. We find that the yearly distribu...
the present study aimed to investigate the possible effects of focused highlighted error feedback on grammatical accuracy of writing among iranian intermediate efl learners. after selecting 52 homogenous participants from among 70 university students attending azad university of rasht and randomly dividing them into two intact groups of 26 students, the researcher exposed the participants of th...
Abstract Large-amplitude geomagnetically induced currents (GICs) are the natural consequences of solar–terrestrial connection triggered by solar eruptions. The threat severe damage power grids due to GICs is a major concern, in particular, at high latitudes, but not well understood as for low-latitude grids. purpose this study evaluate lower limit that could flow Japanese grid against Carringto...
The dynamics of ionospheric troughs during intense geomagnetic storms is considered in this paper. study based on electron density measurements at CHAMP satellite altitudes 405–465 km the period from 2000 to 2002. A detailed analysis four with Kp 5+ 9? presented. Three were identified: sub-auroral, mid-latitude, and low-latitude. sub-auroral trough usually defined as main (MIT). mid-latitude ob...
this research has been taken among the students of high school in karaj city during the years 1391 and 1392. this is a survey research and data gathering is through questionnaires. studying the “an analysis of students’ tendency toward non-native reference groups in karaj”. the questionnaire was distributed among 260 of these students who were chosen through multi step cluster sampling. conside...
this study was an attempt to investigate the effect of using c-test passages on the reading comprehension and incidental vocabulary learning of iranian intermediate efl learners. the participants were 60 male efl learners at kish mehr institute in garmsar. in fact, there were two groups, an experimental group and a comparison group with 30 students in each. the participants were pretested throu...
both heliophysical and anthropogenic (wastewater) effects on zooplankton biomass and abundance of the imandra lake (the largest subarctic lake at kola peninsula, russia) were investigated during the 1990 - 2003 period. we used different indexes of solar activity (sunspot numbers and uv- radiation values) as heliophysical factors. information about uv- radiation values was derived from satellite...
A significant decline of serum 25-hydroxyvitamin D concentration [25(OH)D] with increasing latitude has been reported only for Caucasians. To determine the association between serum 25(OH)D and geographic location and its impact on bone mineral density (BMD) in an Asian population, a total of 17,508 subjects (8910 men and 8598 women) from the 2008-2010 Korea National Health and Nutrition Examin...
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