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Cast Intermetallic Alloys and Composites Based on Them by Combined Centrifugal Casting—SHS Process

Open Journal of Metal 2013年第2期3卷 12-24页

作者： Vladimir Sanin dmitry andreev Denis Ikornikov Vldimir Yukhvid Institute of Structural Macrokinetics and Materials Science RAS Chernogolovka Moscow Russia

This work aims to establish a scientific and engineering background in the production of cast multicomponent alloys and metalmartix composite (MMCs) via Self-Propagating High Temperature Synthesis (SHS, combustion synthesis) which is a novel process technique regarding fast and low-cost production ability. We carried out the search for reactive systems and process parameters that would ensure preparation of cast multicomponent materials in a single process. The principles and methods of the SHS thermite-type reaction processes have been investigated under high-gravity values applying loads up to 1000 g with special centrifuge set-up. In this way we expected to improve the yield of target product, remove gaseous byproducts, diminish the grain size in the product, and make product composition more uniform. The obtained results can be expected to make a theoretical background for industrial-scale manufacturing of heat-resistant intermetallic alloys, master alloys, catalysts, MMCs etc.

关键词： Metallothermic SHS Cast Alloys Intermetallic Alloys MMC Centrifugal Casting

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Endoscopic endonasal transclival removal of tumors of the clivus and anterior region of the posterior cranial fossa (results of surgical treatment of 140 patients)

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Chinese Neurosurgical Journal 2018年第4期4卷 219-232页

作者： Alexey N. Shkarubo Konstantin V. Koval Ilia V. Chernov dmitry N. andreev Alexey B. Kurnosov Andrey A. Panteleyev Federal State Autonomous Institution N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation (N.N. Burdenko NMRCN) 4-ya Tverskaya-YAmskaya street 16 Moscow Russian Federation

Background: Until recently, tumors of the clivus and the anterior region of the posterior cranial fossa were considered extremely difficult to access and often inoperable using standard transcranial approaches. With the introduction into the neurosurgical practice of minimally invasive methods utilizing endoscopic techniques, it became possible to effectively remove hard-to-reach tumors, including central tumors of the anterior region of the posterior cranial fossa. Methods: From 2008 to the present time, the inpatient institution has operated on 140 patients with various tumors of the base of the skull, localized to the clivus and anterior region of the posterior cranial fossa (65 men and 75 women). The age of patients ranged from 3 to 74 years. Tumor distribution according to the histopathological features was as follows: chordomas, 103 (73.57%);meningiomas, 12 (8.57%);pituitary adenomas, 9 (6.43%);fibrous dysplasia, 4 (2.86%);cholesteatoma, 3 (2.14%);craniopharyngiomas, 2 (1.43%);plasmacytomas, 2 (1.43%);and other tumors (giant cell tumor, neurohypophyseal glioma, osteoma, carcinoid, chondroma), 5 (3.57%). The tumors had the following size distribution: giant (more than 60 mm), 35 (25%);large (35–59 mm), 83 (59.3%);medium (21–35 mm), 21 (15%);and small (less than 20 mm), 1 (0.7%). In 11 cases, intraoperative monitoring of the cranial nerves was performed (21 cranial nerves were identified). Results: Upper, middle, and lower transclival approaches provide access to the anterior surface of the upper, middle, and lower neurovascular complexes of the posterior cranial fossa. The chordoma cases were distributed as follows according to extent of removal: total removal, 68 (66.02%);subtotal removal, 25 (24.27%);and partial removal, 10 (9.71%). The adenomas of the pituitary gland were removed totally in 6 cases, subtotally in 1 case and partially in 2 cases. The meningiomas were removed totally in 1 case, subtotally in 5 cases, and partially in 5 cases, with less than 50

关键词： Clivus Clival chordoma Endoscopic endonasal transclival approach Monitoring of cranial nerves Posterior cranial fossa Skull base anatomy Skull base surgery

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