نتایج جستجو برای: faults and fracture

تعداد نتایج: 16853885  

This paper focuses on some fracture toughness tests performed on the pre-cracked Brazilian specimens of rock-like materials. Also the effect of rock fracture filling on the fracture toughness was considered experimentally.  Fracture toughness is a key parameter for studying the crack propagation and fragmentation processes in rock structures. Fracture mechanics is an applicable tool to improve ...

A. Rizk, M. Hamed

Fractures of the rostral mandible in horses are the most common type of jaw fractures. The present study was performed for stabilization of rostral mandibular fracture with cerclage wire. In a retrospective case series, six client-owned horses with unilateral mandibular fractures were admitted to our clinic and suffered from a major gingival wound at rostral part of mandible. Rostral mandibular...

Journal: :Journal of Petroleum Exploration and Production Technology 2022

Abstract Understanding the fracture patterns of hydrocarbon reservoirs is vital in Zagros area southwest Iran as they are strongly affected by collision Arabian and Iranian plates. It essential to evaluate both primary secondary (fracture) porosity permeability understand fluid dynamics reservoirs. In this study, we adopted an integrated workflow assess influence various sets on heterogeneous c...

Journal: :archives of trauma research 0
mitsuaki noda department of orthopedics, konan hospital, kobe, japan; department of orthopedics, konan hospital, kobe, japan. tel: +81-788512161, fax: +81-788210962 yasuhiro saegusa department of orthopedics, konan hospital, kobe, japan masayasu takahashi department of orthopedics, konan hospital, kobe, japan daichi tezuka department of mechanical engineering, graduate school of engineering, kobe university, kobe, japan kazuhiko adachi department of mechanical engineering, graduate school of engineering, kobe university, kobe, japan kazuya naoi department of mechanical engineering, graduate school of engineering, kobe university, kobe, japan

conclusions the most relevant finding was that hook pinning in pauwels type iii fracture may result in delayed :union: or non:union: due to significantly increased stress of a traction force at the fracture site that works to displace the fracture. however, in a pauwels type i fracture, increased compression stress contributes to stabilize it. surgeons are recommended not to treat pauwels type ...

Journal: :International Journal of Rock Mechanics and Mining Sciences 2022

In fractured poroelastic media under high differential stress, the shearing of fractures and faults corresponding propagation wing cracks can be induced by fluid injection. Focusing on low-pressure stimulation with pressures below minimum principal stress but above threshold required to overcome fracture's frictional resistance slip, this paper presents a mathematical model numerical solution a...

Journal: :Computational Materials Science 2021

Extended defects in crystals, such as dislocations, stacking faults and grain boundaries, play a crucial role determining wide variety of materials properties. can also lead to novel electronic properties two-dimensional materials, demonstrated by recent discoveries emergent phenomena twisted graphene bilayers. This paper describes several approaches construct crystallographic models extended c...

The onshore oil and natural gas industries of China have started a large-scale development when crude oil reserves have been difficult to recover. The stratum fracture modification is an indispensable measure to efficiently develop oil and gas fields. Hydraulic fracturing is the most important reservoir stimulation technique, but it is still faced with various problems such as the failure to fr...

Journal: :bulletin of emergency and trauma 0
marjan jeddi endocrine and metabolism research center, shiraz university of medical sciences, shiraz, iran mohammad hossein dabbaghmanesh endocrine and metabolism research center, shiraz university of medical sciences, shiraz, iran alireza kharmandar endocrine and metabolism research center, shiraz university of medical sciences, shiraz, iran gholamhossein ranjbar omrani endocrine and metabolism research center, shiraz university of medical sciences, shiraz, iran marzieh bakhshayeshkaram endocrine and metabolism research center, shiraz university of medical sciences, shiraz, iran

objective: to determine the prevalence of fractures and associated risk factors in healthy iranian children and adolescents. methods: in this cross sectional population based study, 478 healthy iranian children and adolescents aged 9–18 years old participated. baseline data and bone mineral content and density have been determined. one questionnaire was completed for all individuals including p...

Journal: :فیزیک زمین و فضا 0
مجید نعمتی استادیار، دانشگاه باهنر کرمان، دانشکده علوم، بخش زمین شناسی، کرمان، ایران و استادیار، سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران مرتضی طالبیان استادیار، سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران احمد سدیدخوی استادیار، موسسه ژئوفیزیک دانشگاه تهران، ایران نوربخش میرزائی دانشیار، موسسه ژئوفیزیک دانشگاه تهران، ایران محمدرضا قیطانچی استاد، موسسه ژئوفیزیک دانشگاه تهران، ایران

the investigation of this paper focuses on eastern part of shahroud fault system in middle-east alborz. this fault system is an important part in the seismotectonic map of the area. we used two local temporary dense seismological networks data installed around the fault system for several months during 2007 and 2008 and simultaneously micro-earthquakes data recorded by the permanent seismologic...

The fracture mechanics examines the development and expansion of cracks in solids and how they affect the deformation of materials. The stress intensity factors at the tip of the crack and the critical stress intensity factors or fracture toughness of materials are considered in the relevant criteria. There are three main modes of applying forces to a crack including the tensile mode, shear mod...

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