نتایج جستجو برای: standard atmosphere
تعداد نتایج: 569094 فیلتر نتایج به سال:
during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...
Background and Objectives: Evaluation of learning and teaching activities is one of the activities that is given emphasis and attention in the educational institutions. One of the diagnostic tools in this context is assessment of educational environment and educational space or, in other words, educational atmosphere. The aim of this study was to investigate the students' viewpoint about the ed...
Hypersonic flights, re-entry vehicles, and propulsion applications all require new materials that can perform in oxidizing or corrosive atmospheres at temperatures in excess of 2000°C and sometimes over the course of a long working life. Ultra High Temperature Ceramics (UHTCs) are good candidates to fulfill these requirements. Within this family, the ZrB2 and HfB2 based composites are the most ...
The Ultra High Temperature Ceramics (UHTCs) represent a very interesting family of materials and therefore they are the subject of increasing attention from different engineering sectors and notably the aerospace industry. Indeed, hypersonic flights, re-entry vehicles, propulsion applications and so on, require new materials that can perform in oxidizing or corrosive atmospheres at temperatures...
We present the result of a quantitative analysis of 12C/13C ratios in 26 J-type carbon stars. The 12C/13C ratios are determined from lines of the CN red system around 8000 Å, using the iso-intensity method and line-blanketed model atmospheres. The average of 12C/13C ratios in the 26 stars is 4.7 ± 2.8 (standard deviation). All the stars studied, except for two stars, have 12C/13C ratios smaller...
This study was conducted to examine the relationship between the family emotional atmosphere, perceptions of classroom activities, and academic engagement among female high school students. The research design was descriptive- correlational. The statistical population of the study was comprised of all female high school students in District 4 of Ahwaz from among whom 341 students were selected ...
The ion atmosphere of nucleic acids directly affects measured biochemical and biophysical properties. However, study of the ion atmosphere is difficult due to its diffuse and dynamic nature. Standard techniques available have significant limitations in sensitivity, specificity, and directness of the assays. Buffer exchange-atomic emission spectroscopy (BE-AES) was developed to overcome many of ...
The influence of an atmospheric model on shower reconstruction is studied. In the fluorescence detection technique, one of the key measurements is the depth of shower maximum in the atmosphere,Xmax. The altitude corresponding toXmax depends considerably on distributions of atmospheric pressure and temperature, used in the shower reconstruction. In this paper, measured atmospheric profiles at di...
Syntheses of organometallic initiators were conducted under a nitrogen atmosphere using standard Schlenk techniques. All reagents were of commercial grade and obtained from Sigma-Aldrich Co.. Solvents and the propionic acid used for the preparation of initiators were carefully dried and distilled under nitrogen atmosphere prior to use. TEMPO was sublimated and stored under nitrogen atmosphere. ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید