نتایج جستجو برای: hole drilling method

تعداد نتایج: 1693963  

2017
Rajib Ghosh Håkan Schunnesson Anna Gustafson

A detailed understanding of the drilling system and the drilling control is required to correctly interpret rock mass conditions based on monitored drilling data. This paper analyses data from hydraulic in-the-hole (ITH) drills used in LKAB’s Malmberget mine in Sweden. Drill parameters, including penetration rate, percussive pressure, feed pressure, and rotation pressure, are monitored in under...

2017
Wei Wang Wei Hu Pei Yang Xiao Qian Dang Xiao Hui Li Kun Zheng Wang

INTRODUCTION Core decompression is an efficient treatment for early stage ischemic necrosis of the femoral head. In conventional procedures, the pre-operative X-ray only shows one plane of the ischemic area, which often results in inaccurate drilling. This paper introduces a new method that uses computer-assisted technology and rapid prototyping to enhance drilling accuracy during core decompre...

Journal: :Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2011
Hongmei Chen Caroline D Hoemann Jun Sun Anik Chevrier Marc D McKee Matthew S Shive Mark Hurtig Michael D Buschmann

Subchondral drilling and microfracture are bone marrow stimulation techniques commonly used for the treatment of cartilage defects. Few studies to date have examined the technical variants which may influence the success of the cartilage repair procedures. This study compared the effect of hole depth (6 mm vs. 2 mm) and hole type (drill vs. microfracture) on chondral defect repair using a matur...

Journal: :Computer Physics Communications 2009
Qingjie Zhao Baojun Zhang Huosheng Hu

a r t i c l e i n f o a b s t r a c t A logging-while-drilling (LWD) system is usually deployed in the oil drilling process in order to provide real-time monitoring of the position and orientation of a hole. Encoded signals including the data coming from down-hole sensors are inevitably contaminated during their collection and transmission to the surface. Before decoding the signals into differ...

Journal: :The American journal of sports medicine 2009
Mark E Steiner Todd C Battaglia James F Heming Jason D Rand Anthony Festa Michael Baria

BACKGROUND Optimal tunnel placement is critical in anterior cruciate ligament reconstructive surgery, yet the method used to drill the tunnels may compromise their placement. HYPOTHESIS An independent drilling method versus a conventional transtibial drilling method will place tunnels in different locations and produce reconstructions with different kinematics. STUDY DESIGN Controlled labor...

Journal: :Statistics and Its Interface 2008

2013
Xiaowei Gong Yi Pan Shuangchun Yang

Currently, the drilling fluid processing and recycling has gained more attention from various oilfields. Whether the waste drilling fluid’s processing and recycling is good or not will directly affect the development of oil industry. Therefore, the urgent affair is to develop and research the processing method of waste drilling fluid.This article describes various processing methods of waste dr...

Journal: :IOP Conference Series: Earth and Environmental Science 2017

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