نتایج جستجو برای: Drilling Region

تعداد نتایج: 549923  

Journal: :Comput. Graph. Forum 2012
Andreas Reh B. Plank Johann Kastner Eduard Gröller Christoph Heinzl

In this work a novel method for the characterization of porosity in carbon fiber reinforced polymers (CFRP) is presented. A visualization pipeline for the interactive exploration and visual analysis of CFRP specimens is developed to enhance the evaluation workflow for non-destructive testing (NDT) practitioners based on specified tasks. Besides quantitative porosity determination and the calcul...

Journal: :Endocrinology 2014
Christopher D Kassotis Donald E Tillitt J Wade Davis Annette M Hormann Susan C Nagel

The rapid rise in natural gas extraction using hydraulic fracturing increases the potential for contamination of surface and ground water from chemicals used throughout the process. Hundreds of products containing more than 750 chemicals and components are potentially used throughout the extraction process, including more than 100 known or suspected endocrine-disrupting chemicals. We hypothesiz...

2004
J. S. Strenkowski A. J. Shih

An analytical finite element technique was developed for predicting the thrust force and torque in drilling with twist drills. The approach was based on representing the cutting forces along the cutting lips as a series of oblique sections. Similarly, cutting in the chisel region was treated as orthogonal cutting with different cutting speeds depending on the radial location. For each section, ...

2003
Houjiang Zhang Wuyi Chen Dingchang Chen Liangchi Zhang

This paper investigates the formation of the exit defects in carbon fibre-reinforced plates and characterizes their features in terms of drilling conditions. It was found that spalling and fuzzing are the major mechanisms of exit defects. The spalling, consisting of a main region and a secondary region, is caused by chisel and cutting edge actions, in which the former plays a key role. The fuzz...

2016
Lv Xikui Li Yongfa

The display of three dimensional geological body can visually describe the complex subsurface geological structure, effectively improve the engineer's space imagination and intuitively understand the geological spatial relationship. Through analysis of commonly used three dimensional geological data model and considered the impact of faults. The paper establishes a generalized triangular prism ...

Journal: :Technology and health care : official journal of the European Society for Engineering and Medicine 2015
Khurshid Alam Mushtaq Khan Riaz Muhammad Sayyad Zahid Qamar Vadim V Silberschmidt

BACKGROUND Bone drilling is a common practice of surgical treatments in orthopaedics and traumatology. Penetration of a high-speed drill into bone tissue is accompanied by generation of a significant amount of heat. Cooling of the drilling region is necessary to avoid potential risk of thermal damage to bone. OBJECTIVE The purpose of this study was to measure and predict bone temperature by c...

2012
D. Sui

To ensure safe and stable drilling operation, bottom hole pressure (BHP) should be kept within some region. However measurement of the BHP is sometimes not available or reliable, especially when the circulation is low, e.g., during pipe connection procedures. This paper presents the application of a moving horizon estimation (MHE) method for online estimation of the BHP during petroleum drillin...

Journal: :اکو هیدرولوژی 0
یونس نوراللهی دانشکدة علوم و فنون نوین دانشگاه تهران حسین یوسفی دانشکدة علوم و فنون نوین دانشگاه تهران سعیده صادقی دانشکدة علوم و فنون نوین دانشگاه تهران سعید محمد زاده بینا دانشکدة انرژی و محیط زیست، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران سارا صادقی دانشکدة علوم و فنون دریایی، دانشگاه آزاد اسلامی واحد تهران شمال

in this paper, the results of surface and ground water quality monitoring during drilling of three deep exploratory wells in geothermal project in north west of sabalan in meshkinshahr are analyzed. the region has been investigated by various researchers to generate electricity using geothermal energy. drilling in deep geothermal projects, a variety of materials such as cement, bentonite, barit...

Journal: :Mathematical and Computer Modelling 2005
Tasawar Hayat A. H. Kara Ebrahim Momoniat

K e y w o r d s F o u r t h g r a d e fluid, Unsteady flow, Lie symmetries. 1. I N T R O D U C T I O N In recent years, considerable efforts have been usefully devoted to the s tudy of flow of nonNewton ian fluids. This is ma in ly due to their m a n y appl icat ions in pe t ro leum drilling, manufactu r ing of food and paper, and other similar activities. A vast a m o u n t of l i te ra ture i...

2008
Anol Bhattacherjee Christopher J. Davis Neset Hikmet Varol O. Kayhan

This paper examines the diverse nature of user reactions to information technology (IT) within the social-historical context of its organizational use. Employing activity theory as a conceptual framework, we conduct an interpretive analysis of physicians work, perceptions, and IT usage experience at a large community hospital to understand why some of these physicians were favorably disposed to...

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