نتایج جستجو برای: ztd is computed from surface pressure
تعداد نتایج: 9845772 فیلتر نتایج به سال:
Tropospheric delays are one of the main sources of errors in the Global Navigation Satellite System (GNSS). They are usually corrected by using tropospheric delay models, which makes the accuracy of the models rather critical for accurate positioning. To provide references for suitable models to be chosen for GNSS users in China, we conduct herein a comprehensive study of the performances of th...
in civil engineering concrete is a material combined of hydraulic cement, sand, gravel and water. gravel and sand compose 60 to 70 percent of concrete. these aggregates support compression force of concrete. cement paste acts as glue to stick grain together. in bushehr factories producing aggregates do not operate according to astm standards, so that fineness modulus (fm) of the produced sands ...
ground settlement is often the most serious concern when tunneling under an old city with numerous historic monuments. a successful engineering design under these conditions would require getting the most out of the ground strength parameters and avoiding any weakening maneuver throughout the operation. knowing that surface settlement is highly affected by tunneling parameters in epb shield tun...
We have isolated the magnetochiral refraction in Pasteur’s tartrates and deduced the associated magnetochiral absorption. The presence of a strong peak at 235 nm in the magnetochiral absorption spectrum of tartrates shows that Pasteur’s first attempt to induce chirality with a magnetic field could perhaps have succeeded, provided that a UV source was simultaneously used. To cite this article: T...
teachers’ beliefs greatly influence their performance in the classroom, their choice of instructional strategies, their way of controlling the class, their dealing with the students, and their general goals and objectives. one of these beliefs is teachers’ sense of efficacy which is viewed as an important construct and has shown to be positively correlated with students’ achievement (ross, 1992...
the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...
chapter two presents three m-admissible function algebras ab, bd, and sl, to construct the universal abelian, band, and semilattice compactifications, respectively. the main results are (11.3), (12.3), and (12.4). some inclusion relationships between these function algebras and the other well-known ones, presented in section 8, are made via the devico of compactifications. chpter three is about...
Background: The aim of this study was to investigate the effect of muscle fatigue on ankle joint moment and center of pressure during single-leg stance, perturbed by forward or backward platform perturbations. Methods : In this semi-experimental study fatigue induced to knee muscles by using an ergometer (monark). Surface elecromyographic signals were recorded from knee muscles during maxim...
The thermal and mechanical properties of pure cobalt were studied by using the molecular dynamics (MD) simulation technique, in the temperature range from 200 K up to melting point. The Cleri-Rosato many-body potential was used as interatomic potential. This MD simulation was employed at the constant pressure, constant temperature (NPT) ensemble. The temperature and pressure of the system were ...
Accurate estimation of tropospheric delay is significant for global navigation satellite system’s (GNSS) high-precision and positioning. However, due to the random contingent changes in weather conditions water vapor factors, classical model cannot accurately reflect delay. In recent years, with development meteorological observation/detection numerical prediction (NWP) technology, accuracy res...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید