Xem 1-20 trên 25 kết quả Stress fracture
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Non union of scaphoid fracture in a cricketer – possibility of a stress fracture: a case report...

    pdf2p thulanh27 14-12-2011 14 2   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Clavicular stress fracture in a cricket fast bowler: A case report

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  • Fractures are ubiquitous in the brittle lithosphere in the upper part of earth’s crust. They play a critical role in the transport of fluids. Moreover, all major discovered geothermal reservoirs and a considerable number of petroleum reservoirs are in fractured rocks. This restates the importance of studying multiphase flow behavior inside the opened fracture space. From the engineering point of view, a rock fracture as defined here is simply a complex-shaped cavity filled with fluids or solid minerals. Therefore it is understood to include cracks, joints, and faults.

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  • The book "Applied Fracture Mechanics" presents a collection of articles on application of fracture mechanics methods to materials science, medicine, and engineering. In thirteen chapters, a wide range of topics is discussed, including strength of biological tissues, safety of nuclear reactor components, fatigue effects in pipelines, environmental effects on fracture among others. In addition, the book presents mathematical and computational methods underlying the fracture mechanics applications, and also developments in statistical modeling of fatigue.

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  • Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.In modern materials science, fracture mechanics is an important tool in improving the mechanical performance of materials and components.

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  • CARPINTERI Minimum Reinforcement in Concrete Members. ISBN: 0-08-043022-8 FUENTES E T A L Fracture Mechanics: Applications and Challenges. ISBN: 0-08-043699-4 JONES Failure Analysis Case Studies 11. ISBN: 0-08-043959-4 MACHAETAL Multiaxial Fatigue and Fracture. ISBN: 0-08-043336-7 MARQUIS & SOLIN Fatigue Design of Components. ISBN: 0-08-04331U-Y MARQUIS & SOLIN Fatigue Design and Reliability. ISBN: 0-08-043329-4 MOORE ETAL. Fracture MechanicsTesting Methods for Polymers, Adhesives and Composites.

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  • Tham khảo sách 'fiber fracture elsevier science', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The fracture toughness of medium density fiberboard (MDF) as a function of crack length was measured. Fracture toughness was determined from force–displacement and crack length data using a new energy analysis procedure that avoids the scatter of prior discrete analysis methods. Because crack lengths were difficult to observe, they were measured using digital image correlation (DIC). The R curves for two different densities of MDF, two thicknesses, and for both in-plane and through-the-thickness cracks all increased linearly with crack length.

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  • Rheology involves the study of the deformation and flow of matter. The goal is to establish relationships between stress and deformation for (non-Newtonian) materials where neither Newton's law nor Hooke's law suffice to explain their mechanical behaviour. Many materials exhibit a non-Newtonian behaviour and the area is relevant in many fields of study from industrial to technological applications such as concrete technology, geology, polymers and composites, plastics processing, paint flow, hemorheology, cosmetics, adhesives, etc ......

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  • Difficulty in addressing contamination in low permeability soils may be alleviated to some degree by controlled pneumatic or hydraulic fracturing of the soil. However, engineered hydraulic fractures generally cannot be spaced more closely than about 5 feet, which means that chemical oxidants must still penetrate a substantial thickness of low permeability soil to come into contact with the contamination. Deep soil mixing with large diameter drill augers is the most effective method currently available to increase contact between adsorbed contaminants and the oxidants.

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  • The Subcommittee on Body Composition, Nutrition, and Health of Military Women (BCNH subcommittee) was established in 1995 through a grant administered by the U.S. Army Medical Research and Materiel Command as part of the Defense Women's Health Research Program.

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  • Almost 75 percent of the elderly (age 65 and over) have at least one chronic illness.3 About 50 percent have at least two chronic illnesses.3 Chronic conditions can lead to severe and immediate disabilities, such as hip fractures and stroke, as well as progressive disability that slowly erodes the ability of elderly people to care for themselves.4 According to AHRQ’s 1996 Medical Expenditure Panel Survey (MEPS),a about 14.3 percent of people age 65 and over—4.5 million elderly Americans—require assistance with bathing, dressing, preparing meals, or shopping.

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  • The subject of rock mechanics started in the 1950s from a rock physics base and gradually became a discipline in its own right during the 1960s. As explained in the Preface, rock mechanics is the subject concerned with the response of rock to an applied disturbance, which is considered here as an engineering, i.e. a man-induced, disturbance. For a natural disturbance, rock mechanics would apply to the deformation of rocks in a structural geology context, i.e.

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  • Congenital Anomalies of the Lumbar Spine Spondylolysis is a bony defect in the pars interarticularis (a segment near the junction of the pedicle with the lamina) of the vertebra; the etiology may be a stress fracture in a congenitally abnormal segment. The defect (usually bilateral) is best visualized on oblique projections in plain x-rays, CT scan, or single photon emission CT (SPECT) bone scan and occurs in the setting of a single injury, repeated minor injuries, or growth.

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  • Tham khảo sách 'mineral requirements for military personnel: levels needed for cognitive and physical performance during garrison training', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The earliest stone tools were crude, being little more than a fractured rock. In the Acheulian era, beginning approximately 1.65 million years ago, methods of working these stone into specific shapes, such as hand axes emerged. The Middle Paleolithic, approximately 300,000 years ago, saw the introduction of the prepared-core technique, where multiple blades could be rapidly formed from a single core stone.

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  • When we sat down to design ‘‘the one sports medicine textbook’’ for graduating family medicine residents and all sports fellows, we really did not imagine creating something 650 pages long. Sports medicine seemed a relatively simple thing, just muscles and bones and people hurting themselves. But as we tried to compile a single text describing the philosophy, examinations, treatments, procedures, and special considerations inherent in our daily practice, we soon gained a firsthand appreciation for how big the field is and how long it takes to walk across it....

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  • Các chất rắn Ứng suất (Nd: Stress) · Sự biến dạng (Nd: Deformation) Tính tương thích (Nd: Compatibility) Sức căng hữu hạn (Nd: Finite strain) · Sức căng vi phân (Nd: Infinitesimal strain) Tính đàn hồi (Nd: Elasticity) (tuyến tính (Nd: linear)) · Tính dẻo (Nd: Plasticity) Sự uốn (Nd: Bending) · Định luật Hooke Học thuyết hư hỏng (Nd: Failure theory) Cơ học đứt gãy (Nd: Fracture mechanics)

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  • that can occur during the various phases of oil and gas recovery from subsurface reservoirs including production, drilling, hydraulic fracturing, and workover operations. Formation damage assessment, control, and remediation are among the most important issues to be resolved for efficient exploitation of hydrocarbon reservoirs. Such damage is caused by various adverse processes, including chemical, physical, biological, and thermal interactions of formation and fluids, and deformation of formation under stress and fluid shear.

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  • This concept may also be applied for a structure under constant load to quantify the susceptibility to fracture. Fracture is most likely to occur at locations where high tension stress and/or severe stress con- centration exist. Fatigue cracking due to repeated loading is more likely to occur (will occur sooner) at locations where high Sr and/or low fatigue categories exist.

    pdf20p lyacau 30-12-2009 59 19   Download

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