نتایج جستجو برای: معادلات حالت saft

تعداد نتایج: 59964  

2010
Sabine Müller Ernst Niederleithinger Martin Krause Thomas Bohlen

INTRODUCTION New fast and efficient multi-channel ultrasonic echo measurement systems are currently introduced for practical applications in NDT-CE [ 1, 2]. The acquired multi-offset data are currently processed and imaged by the synthetic aperture focussing technique (SAFT, see e.g. [ 3, 4]). The application of SAFT, which is closely related to the seismic Kirchhoff migration method, is succes...

2010
H. Karasawa T. Ikeda S. Matsumoto

3D ultrasonic inspection equipment “Matrixeye” can visualize defects as 3D image with good resolution by the 3D SAFT (Synthetic Aperture Focusing Technique) imaging method. High-speed 3D SAFT imaging process can be achieved by the developed parallel signal process of the ultrasonic echo data collected by a linear or a matrix-array ultrasonic probe. It has the following features. •3D image with ...

Journal: :Optics express 2017
De Cai Zhongfei Li Yao Li Zhendong Guo Sung-Liang Chen

Acoustic-resolution photoacoustic microscopy (ARPAM) plays an important role in studying the microcirculation system of biological tissues with deep penetration. High lateral resolution of ARPAM is achieved by using a high numerical aperture acoustic transducer. The deteriorated lateral resolution in the out-of-focus region can be alleviated by synthetic aperture focusing technique (SAFT). Prev...

2010
Tomas Olofsson Martin Hansen Skjelvareid

The synthetic aperture focusing technique (SAFT) is often used for imaging in non-destructive ultrasonic testing. Conventional SAFT is well suited for contact testing of homogeneous objects because of the constant sound speed throughout the media, whereas the refraction present in the practically important case of immersion tests has so far prevented a widespread use of SAFT for such data. Fort...

ژورنال: :پژوهش نفت 2015
حسین محمود جانلو hldvufhs ایزدپناه شهریار عصفوری

خواص ترمودینامیکی و تعادل فازی مخلوط های تجمعی را معمولا نمی توان با استفاده از مدل های مرسوم مانند معادلات مکعبی پیش بینی نمود. معادله حالت مکعبی/ تجمعی cpa، معادله حالتی است که معادله حالت مکعبی srk را با عبارت تجمعی معادله saft ترکیب می کند. در این تحقیق، ابتدا با استفاده از داده های آزمایشگاهی فشار بخار و حجم مایع اشباع ان فرمیل مورفولین (nfm)، پارامترهای معادله  حالت cpa برای ان فرمیل مورف...

Journal: :gas processing 0
cyrus ghotbi department of chemical and petroleum engineering, sharif university of technology, tehran, iran mohammadali safavi research institute of petroleum industry (ripi), tehran, iran maryam tavakolmoghadam research institute of petroleum industry (ripi), tehran, iran

in this work, the pc-saft equation of state (eos) has been used to model the solubility of acid gases (co2 and h2s) in two imidazolium-based ionic liquids (ils) ([c8-mim][pf6] and [c8-mim][tf2n]). parameters of pure ils were estimated using experimental densities. two strategies were considered to model densities of pure ils. in strategy 1, ils were modeled as nonassociating compounds and in st...

2002
P. David Ting George J. Hirasaki Walter G. Chapman

The SAFT equation of state was used to model asphaltene phase behavior in a model live oil and a recombined oil under reservoir conditions. The equation of state parameters for the asphaltenes were fit to precipitation data from oil titrations with n-alkanes at ambient conditions. The SAFT model was then used to predict the asphaltene stability boundaries in the live oils. A lumping scheme that...

2015
Zhongfei Li Sung-Liang Chen

Photoacoustic imaging with a synthetic aperture focusing technique (SAFT) is an effective method to improve the lateral resolution for out-of-focus regions in scanning microscopy systems, which commonly require a decent motorized scanning stage for a lateral scan of a transducer to obtain a cross-sectional image. In this study, we propose and test a photoacoustic imaging system with a scanning ...

2006
Simon Heimlicher Rainer Baumann Martin May Bernhard Plattner

Unstable networks such as wireless mobile ad hoc networks (MANETs) are radically different from traditional fixed networks like the Internet. The success of these emerging networks is determined by the performance of the communication layers and the transport layer. For the latter, many protocols have been proposed based on adaptations of TCP for such unstable networks. In this paper, we claim ...

Journal: :The Journal of chemical physics 2004
Yurij V Kalyuzhnyi Clare McCabe Eric Whitebay Peter T Cummings

The accuracy of several theories for the thermodynamic properties of the Yukawa hard-sphere chain fluid are studied. In particular, we consider the polymer mean spherical approximation (PMSA), the dimer version of thermodynamic perturbation theory (TPTD), and the statistical associating fluid theory for potentials of variable attractive range (SAFT-VR). Since the original version of SAFT-VR for...

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