In this case report, we present a patient who suffered from gastrointestinal bleeding. The bleeding source was a gastric arterio-venous malformation emerging from the splenic artery. Attempts to stop the bleeding fail...In this case report, we present a patient who suffered from gastrointestinal bleeding. The bleeding source was a gastric arterio-venous malformation emerging from the splenic artery. Attempts to stop the bleeding failed and therapeutic angiography succeeded in occluding the vessel. A search at the literature has not yielded any other case report describing this anatomical anomaly.展开更多
Spinal dural arteriovenous fistulas (SDAVF) account for about 70% of all spinal AV shunts. We re-port on a 56-year-old male patient with progressive neurological symptoms. Pre- and post-contrast MR imaging of the spin...Spinal dural arteriovenous fistulas (SDAVF) account for about 70% of all spinal AV shunts. We re-port on a 56-year-old male patient with progressive neurological symptoms. Pre- and post-contrast MR imaging of the spine, including contrast-enhanced MR angiography was done on a 1.5 T MR scanner. In addition a special (pre-contrast) 3D turbo-spin-echo sequence with variable flip angle evolution (SPACE) was performed providing a slice thickness of 0.9 mm. T2-weighted images showed extensive widened and tortuous vascular structures with typical flow voids intradurally due to dilated pial veins. The origin of the spinal dural arteriovenous fistula was found to be the radiculomeningeal artery at level D10/11 on the left side, visualized by the T2-weighted 3D SPACE sequence and CE MRA. After imaging the patient was referred to an interventional neuroradiology department for therapy. With the detailed information from MR imaging concerning the fistula level the interventional radiologist was able to find the fistula immediately and consequently treated it successfully by endovascular therapy. Interpreting the MR images of this obvious case of a SDAVF, SPACE sequence after post processing with 3D MPR software directly led to the location of the AV shunt at D10/11 on the left side, better than 3D contrast-enhanced MR angiography did. Therefore, SPACE can be a useful adjunct in further evaluation of spinal dural arteriovenous fistula and especially in defining fistula level.展开更多
针对超(超)临界电站锅炉高温受热面材料蒸汽侧氧化问题,该文开展国产镍基合金C-HRA-1在620~650℃/25 MPa以及C-HRA-2在650℃/25 MPa超临界水环境的氧化实验研究。利用精密电子天平、扫描电子显微镜(scanning electron microscope,SEM)、...针对超(超)临界电站锅炉高温受热面材料蒸汽侧氧化问题,该文开展国产镍基合金C-HRA-1在620~650℃/25 MPa以及C-HRA-2在650℃/25 MPa超临界水环境的氧化实验研究。利用精密电子天平、扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)以及原子力显微镜(atomic force microscope,AFM)等对材料氧化动力学、氧化膜微观形貌以及氧化膜物相组成进行分析。同时,开展600℃/25 MPa超临界水环境氧同位素标记实验,探究镍基合金C-HRA-1在超临界水中的氧化机理。结果可知,C-HRA-1与C-HRA-2氧化后的主要物相为Cr_(2)O_(3)和NiCr_(2)O_(4),NiO、CoO、MoO_(3)以及NiFe_(2)O_(4)也被检测到;合金中阳离子向外扩散导致了氧化膜的生长。国产镍基合金C-HRA-1在超临界水中表现出较高的抗氧化性能。展开更多
The Great Gatsby has been one of the most discussed topics,researchers has explored it from various aspects.In the researches,Nick Carraway was mainly seen as a narrator,and the research are mostly focus on the shift ...The Great Gatsby has been one of the most discussed topics,researchers has explored it from various aspects.In the researches,Nick Carraway was mainly seen as a narrator,and the research are mostly focus on the shift of his narrative prospective.Few people noticed that he was totally fit into the definition of the " wise old man".This paper tries to put an eye on the archetype of the hero Nick Carraway,whose figure is thought as in the archetype of the " wise old man".展开更多
The recrystallization behavior of a single crystal nickel-base superalloy was investigated by shot peening and subsequent annealing. Two kinds of recrystallization microstructures, which are intensively dependent on t...The recrystallization behavior of a single crystal nickel-base superalloy was investigated by shot peening and subsequent annealing. Two kinds of recrystallization microstructures, which are intensively dependent on the annealing temperature, are shown in the nickel-base superalloy after shot peening and subsequent annealing. Surface recrystallized grains are obtained when the superalloy is annealed at solution treatment temperature. The nucleation of recrystallization originates from the dendritic core, where rapid dissolution of γ＇ particles occurs. Cellular recrystallization is observed after annealing at lower temperatures. Cellular structures induced by high diffusivity of the moving boundary and more γ＇ particles dissolution led by residual stress are developed from the surface region. Recrystallized kinetics of the shot-peened alloy annealed at 1050°C accords with the Johnson-Mehl-Avrami-Kolmogorov equation. The low Avrami exponent is caused by the inhomogeneous distribution of stored energy, the decreasing of stored energy during recovery, and the strong resistance of boundary migration by γ＇ particles.展开更多
Nick Carraway is one of the main characters as well as the narrator in F. Scott Fitzgerald's The Great Gatsby. This paper applies the theory of Bildungsroman and analyzes the changes of Nick in characters, conscie...Nick Carraway is one of the main characters as well as the narrator in F. Scott Fitzgerald's The Great Gatsby. This paper applies the theory of Bildungsroman and analyzes the changes of Nick in characters, conscience as well as responsibilities from the following aspects: guides of maturity and epiphany during maturity, and reveals his ultimate maturity both physically and mentally after epiphany, thus shows the changes and maturity of him.展开更多
In F. Scott Fitzgerald's world famous novel The Great Gatsby, Nicolas"Nick"Carraway is not only a first-person narrator, but also a convincing narrator, an emotion depositor, and a structure organizer. H...In F. Scott Fitzgerald's world famous novel The Great Gatsby, Nicolas"Nick"Carraway is not only a first-person narrator, but also a convincing narrator, an emotion depositor, and a structure organizer. He is the figure of equal weight with Jay Gatsby and Daisy Buchanan, the two conceived protagonists in this book.展开更多
Fitzgerald tells the story in The Great Gatsby through the dramatized narrator, or the character in the play which helps this novel become a classic one. In this paper, the endeavor is to discover Nick Carraway both a...Fitzgerald tells the story in The Great Gatsby through the dramatized narrator, or the character in the play which helps this novel become a classic one. In this paper, the endeavor is to discover Nick Carraway both as a character and a narrator from the perspective of impersonal narration.展开更多
BACKGROUND In the modern era of endovascular surgery percutaneous interventions are being widely used to treat a number of vascular disorders including arteriovenous fistulas(AVF).Still,patients with hostile anatomy o...BACKGROUND In the modern era of endovascular surgery percutaneous interventions are being widely used to treat a number of vascular disorders including arteriovenous fistulas(AVF).Still,patients with hostile anatomy or complicated cases such as large post-traumatic AVFs may be successfully treated using conventional vascular surgery.CASE SUMMARY This paper presents state-of-the-art treatment options in subjects with posttraumatic AVFs and a case-report of a successful open surgical approach in a patient with a 25 year old history of a post-traumatic AVF between the common femoral artery and common femoral vein.CONCLUSION Open surgery is still a great option to treat patients with post-traumatic arteriovenous fistulas with hostile anatomy or in complicated cases.Concomitant conditions and complications should be addressed promptly.展开更多
文摘In this case report, we present a patient who suffered from gastrointestinal bleeding. The bleeding source was a gastric arterio-venous malformation emerging from the splenic artery. Attempts to stop the bleeding failed and therapeutic angiography succeeded in occluding the vessel. A search at the literature has not yielded any other case report describing this anatomical anomaly.
文摘Spinal dural arteriovenous fistulas (SDAVF) account for about 70% of all spinal AV shunts. We re-port on a 56-year-old male patient with progressive neurological symptoms. Pre- and post-contrast MR imaging of the spine, including contrast-enhanced MR angiography was done on a 1.5 T MR scanner. In addition a special (pre-contrast) 3D turbo-spin-echo sequence with variable flip angle evolution (SPACE) was performed providing a slice thickness of 0.9 mm. T2-weighted images showed extensive widened and tortuous vascular structures with typical flow voids intradurally due to dilated pial veins. The origin of the spinal dural arteriovenous fistula was found to be the radiculomeningeal artery at level D10/11 on the left side, visualized by the T2-weighted 3D SPACE sequence and CE MRA. After imaging the patient was referred to an interventional neuroradiology department for therapy. With the detailed information from MR imaging concerning the fistula level the interventional radiologist was able to find the fistula immediately and consequently treated it successfully by endovascular therapy. Interpreting the MR images of this obvious case of a SDAVF, SPACE sequence after post processing with 3D MPR software directly led to the location of the AV shunt at D10/11 on the left side, better than 3D contrast-enhanced MR angiography did. Therefore, SPACE can be a useful adjunct in further evaluation of spinal dural arteriovenous fistula and especially in defining fistula level.
文摘The Great Gatsby has been one of the most discussed topics,researchers has explored it from various aspects.In the researches,Nick Carraway was mainly seen as a narrator,and the research are mostly focus on the shift of his narrative prospective.Few people noticed that he was totally fit into the definition of the " wise old man".This paper tries to put an eye on the archetype of the hero Nick Carraway,whose figure is thought as in the archetype of the " wise old man".
基金supported by the Major State Basic Research and Development Program of China (No.2010CB631206)the National Natural Science Foundation of China (No.50931004)the Foundation of State Key Lab for Advanced Metals and Materials (No.2008zd-07)
文摘The recrystallization behavior of a single crystal nickel-base superalloy was investigated by shot peening and subsequent annealing. Two kinds of recrystallization microstructures, which are intensively dependent on the annealing temperature, are shown in the nickel-base superalloy after shot peening and subsequent annealing. Surface recrystallized grains are obtained when the superalloy is annealed at solution treatment temperature. The nucleation of recrystallization originates from the dendritic core, where rapid dissolution of γ＇ particles occurs. Cellular recrystallization is observed after annealing at lower temperatures. Cellular structures induced by high diffusivity of the moving boundary and more γ＇ particles dissolution led by residual stress are developed from the surface region. Recrystallized kinetics of the shot-peened alloy annealed at 1050°C accords with the Johnson-Mehl-Avrami-Kolmogorov equation. The low Avrami exponent is caused by the inhomogeneous distribution of stored energy, the decreasing of stored energy during recovery, and the strong resistance of boundary migration by γ＇ particles.
文摘Nick Carraway is one of the main characters as well as the narrator in F. Scott Fitzgerald's The Great Gatsby. This paper applies the theory of Bildungsroman and analyzes the changes of Nick in characters, conscience as well as responsibilities from the following aspects: guides of maturity and epiphany during maturity, and reveals his ultimate maturity both physically and mentally after epiphany, thus shows the changes and maturity of him.
文摘In F. Scott Fitzgerald's world famous novel The Great Gatsby, Nicolas"Nick"Carraway is not only a first-person narrator, but also a convincing narrator, an emotion depositor, and a structure organizer. He is the figure of equal weight with Jay Gatsby and Daisy Buchanan, the two conceived protagonists in this book.
文摘Fitzgerald tells the story in The Great Gatsby through the dramatized narrator, or the character in the play which helps this novel become a classic one. In this paper, the endeavor is to discover Nick Carraway both as a character and a narrator from the perspective of impersonal narration.
文摘BACKGROUND In the modern era of endovascular surgery percutaneous interventions are being widely used to treat a number of vascular disorders including arteriovenous fistulas(AVF).Still,patients with hostile anatomy or complicated cases such as large post-traumatic AVFs may be successfully treated using conventional vascular surgery.CASE SUMMARY This paper presents state-of-the-art treatment options in subjects with posttraumatic AVFs and a case-report of a successful open surgical approach in a patient with a 25 year old history of a post-traumatic AVF between the common femoral artery and common femoral vein.CONCLUSION Open surgery is still a great option to treat patients with post-traumatic arteriovenous fistulas with hostile anatomy or in complicated cases.Concomitant conditions and complications should be addressed promptly.
