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Cranial nerve monitoring in endoscopic endonasal surgery of skull base tumors (observing of 23 cases)

Chinese Neurosurgical Journal 2019年第1期5卷 21-29页

作者： A.N.Shkarubo i.v.chernov A.A.Ogurtsova v.E.chernov O.v.Borisov K.v.Koval D.N.Andreev Department of Neurooncology Federal State Autonomous Institution"N.N.Burdenko National Medical Research Center of Neurosurgery"of the Ministry of Health of the Russian FederationMoscowRussia Department of Neurophysiology Federal State Autonomous Institution"N.N.Burdenko National Medical Research Center of Neurosurgery"of the Ministry of Health of the Russian FederationMoscowRussia Department of Neurosurgery N.N.Burdenko Main Military Clinical Hospital of the Ministry of Defense of the Russian FederationMoscowRussia Laboratory of Molecular Human Genetics Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological AgencyMoscowRussia

Background:Preservation of anatomic integrity and function of the cranial nerves during the removal of skull base tumors is one of the most challenging procedures in endoscopic endonasal surgery.it is possible to use intraoperative mapping and identification of the cranial nerves in order to facilitate their preservation.The purpose of this study was to evaluate the effectiveness of intraoperative trigger electromyography in prevention of iatrogenic damage to the cranial nerves.Methods:Twenty three patients with various skull base tumors(chordomas,neuromas,pituitary adenomas,meningiomas,cholesteatomas)underwent mapping and identification of cranial nerves during tumor removal using the endoscopic endonasal approach in Department of Neurooncology of Federal State Autonomous institution"N.N.Burdenko National Medical Research Center of Neurosurgery"of the Ministry of Health of the Russian Federation from 2013 to 2018.During the surgical interventions,mapping and identification of the cranial nerves were carried out using electromyography in triggered mode.The effectiveness of the method was evaluated based on a comparison with a control group(41 patients).Results:in the main group of patients,44 nerves were examined during surgery using triggered electromyography.During the study,the iii,v,vi,vii,and Xii cranial nerves were identified intraoperatively.Postoperative cranial nerve deficiency was observed in 5 patients in the study group and in 13 patients in the control group.The average length of hospitalization was 9 days.Conclusion:We did not receive statistically significant data supporting the fact that intraoperative identification of cranial nerves using trigger electromyography reduces the incidence of postoperative complications in the form of cranial nerve deficits(p=0.56),but the odds ratio(0.6)suggests a less frequent occurrence of complications in the study group.Based on our experience,the trigger electromyography methodology appears quite promising and requires further research.

关键词： Electromyography T-EMG intraoperative cranial nerve identification Endoscopic endonasal approach Skull base tumor surgery

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On the Zebra Structure in the Frequency Range near 3 GHz

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Chinese Journal of Astronomy and Astrophysics 2001年第6期1卷 525-536页

作者： G.P.chernov L.v.Yasnov~ Yi-HuaYan Qi-JunFu NationalAstronomicalObservatories ChineseAcademyofSciencesBeijing100012 St.PetersbourgUniversity St.PetersbourgRussia

We present 19 cases of zebra pattern structure (ZPS) and fiber bursts (FB) in radio bursts in frequency range around 3 GHz, and one such case in the range 5.2-7.6 GHz, using the new microwave spectrometer of NAOC between 2.6-3.8 and 5.2-7.6 GHz (China, Huairou station) with high resolution (10 MHz and 8 ms). The FB and ZPS have about the same spectral parameters: the frequency bandwidth of emission stripes △f-20MHz, the frequency separation between the emission and the neighboring low frequency absorption -△fea-30MHz and the frequency separation between emission stripes (when a periodic structure persists) △fs -60-70 MHz. Therefore we consider both these fine structures to be whistler manifestations, i.e., interactions of plasma electrostatic waves with whistler waves (generated by the same fast particles with loss-cone anisotropy) l + w → t. The duration of the fiber bursts of about 2 s corresponds to whistler waves propagating undamped at about 2s, which requires a whistler increment in the frequency range 3-7 GHz the relation between the ratios of plasma to cyclotron frequencies and whistler to cyclotron frequencies is almost independent of the decrement of whistler electron damping. This finding is used to obtain the magnetic field strength in the region of generation. For a reasonable value of electron temperature (2-20 MK), we find B = 125-190 G when the electron density is (8-18) × 1010 cm-3 and B = 520 - 610 G when the electron density is (35-60) × 1010 cm-3. in two remarkable events, 1998-04-15 and 2000-10-29, the right-hand polarization is strong for all the fine structures and corresponds to ordinary wave.

关键词： Sun: radio radiation - Sun: activity

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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% of the tumor removed in 1 case. Other tumors (

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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Preparation of diffusion coatings in ion-electron melts

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广东有色金属学报 2005年第2期15卷 467-470页

作者： Anfinogenov A.i . Chebykin v.v. chernov Ya .B. institute of High-Temperature Electrochemistry Ural Division of RAS Ekaterinburg 620219 Russia

A procedure of Ni, Cr, Mn, Co, and Mo (Me) transfer onto iron substrate in ionic-electronic melts LiCl-Li, CaCl2-Ca, and BaCl2-Ba was elaborated and the transport processes were studied. The saturated vapor pressure of these ionic-electronic melts is as low as enabled working at atmosphere pressure in an inert media up to 1000 ℃.Armco iron was used as a substrate because it practically does not interact with lithium, calcium, and barium. The metals-diffusants were put into the melts in the form of a powder. The complete saturation of the melts with lithium, calcium, and barium was ensured by a preceding contact of a molten salt with an excess of Li, Ca, or Ba before loading of iron.The reactions take place despite the metals and iron were separated from each other by the molten salt. The quantity of the metals transfered was determined by the change in mass before and after experiments, by microprobe analysis, and x-raying of the iron surface layer. The experiments were carried out at 900, 950 and 1000℃ during 5, 10, 15 and 20 hours.At the first stage of the process the formation of the ionic-electronic melt occurs. For example, dissolution of calcium in the case of the system CaCl2-Ca is mainly proceeded in the form of one-valent cations: Ca + Ca2+()Ca+. As soon as the metal-diffusance is immersed into the melt, its dissolution in the form of negative ions takes place: Me + Ca+() Me-+ Ca2+. in the vicinity of the iron substrate the last equilibrium will shift to the left generating a solid solution or intermetallide. The thickness of the diffusion layer rises as the temperature and saturation time increase. The obtained coverings were 20-60 (m thick,and their surface layer contained 15%-80% (mass fraction) of the metal-diffusance.Both the composition of the melt and the procedure of the coverings preparation in ionic-electronic melts have been patented (Patent RU2058422, 1996, pr. 30.09.93).

关键词：金属材料表面处理涂层电化学电子-离子融化法

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Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors

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Chinese Optics Letters 2018年第9期16卷 60-64页

作者： A. A. Lyapin S. v. Gushchin A. S. Ermakov S. v. Kuznetsov P. A. Ryabochkina v. Yu. Proydakova v. v. voronov P. P. Fedorov M. v. chernov National Research Ogarev Mordovia State University Saransk 430005 Mordovia Russia Prokhorov General Physics institute of the Russian Academy of Sciences Moscow 119991 Russia

Mechanisms of upconversion luminescence（UCL） of SrF2：Er phosphors corresponding to the 4G11∕2→4i15∕2,2H9∕2→4i15∕2,4F5∕2→4i15∕2,4F7∕2→4i15∕2,2H11∕2→4i15∕2,4S3∕2→4i15∕2,4F9∕2→4i15∕2, and 4i9∕2→4i15∕2 transitions upon excitation of the 4i11∕2 level of Er3＋ions were investigated. Energy transfer upconversion processes are responsible for the populating of the 2H9∕2,2H11∕2,4S3∕2, and 4F9∕2 levels. Cooperative process is the dominant mechanism of luminescence from 4S3∕2 and 4F9∕2 levels for SrF2：Er with high concentrations of Er3＋ions. The UCL from 4G11∕2 and 4F5∕2 is explained by excited-state absorption. Cross-relaxation processes take part in the population of 4F9∕2 and 4i9∕2 levels. For quantifying material performance, the Er3＋-concentration dependence of UCL and the absolute quantum yields of SrF2：Er were studied. The most intensive visible luminescence was obtained for SrF2：Er（14.2%） with 0.28% maximum quantum yield.

关键词： UCL Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors

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软土地基上地表建筑系统的强震反应(英文)

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西北地震学报 2005年第1期27卷 30-35页

作者： POTAPOv v.A. chernov E.A 俄罗斯科学院西伯利亚分院地壳研究所伊尔库茨克格勃64033俄罗斯

本文导出了一种给出相对烈度在lg R^0之间的收敛解(忽略震级)的小震方程式。结合在贝加尔地区岩石抗震特性调查与文字资料和统一理论,使人们可对震源等势面进行评估。确定了在震源区边界处的地震烈度稳定性和弹性波在地壳中的传播,使得... 详细信息

本文导出了一种给出相对烈度在lg R^0之间的收敛解(忽略震级)的小震方程式。结合在贝加尔地区岩石抗震特性调查与文字资料和统一理论,使人们可对震源等势面进行评估。确定了在震源区边界处的地震烈度稳定性和弹性波在地壳中的传播,使得推导出从地震主要参数震级向随震中距不同的烈度定量计算的转换成为可能。获得了烈度(能通量的密度)对距离的双线性相关,给出了能通量密度和相对烈度之间的关系。求出了取决于地表建筑地基的物理特性的振动载荷烈度。在地震学角度,这种强震的定量预测方法是一种提供详细地震区划和场地小区划的可能手段之一。

关键词：地震烈度地震反应抗震

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Sterilization complexes based on iLU-type electron accelerators

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Nuclear Science and Techniques 2011年第1期22卷 13-17页

作者： v.v.Bezuglov A.A.Bryazgin L.A.voronin v.A.Gorbunov E.N.Kokin M.v.Korobeynikov A.N.Lukin i.G.Makarov S.A.Maximov A.D.Panfilov v.S.Podobaev v.M.Radchenko A.v.Sidorov v.v.Tarnetskiy M.A.Tiunov v.O.Tkachenko B.L.Faktorovich E.A.Shtarklev K.N.chernov Budker institute of Nuclear Physics Siberian BranchRussian Academy of Science 11 Academician Lavrentyev av.Novosibirsk 630090Russia

This paper describes the industrial electron accelerators of the iLU type and their usage for sterilization.The iLU machines produced by Budker institute of Nuclear Physics have energy range of 0.8-10 Mev and beam power up to 100 kW,and they are working in industries all over the world.The iLU-10 and iLU-14 machines are described as well as the industrial sterilization facility based on iLU-6,iLU-10 and iLU-14 machines.

关键词：电子加速器菌物 U型物理研究所能量范围基础设施 Mev 工业

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Grouting of Waste of the Baikal Pulp and Paper Mill to Reduce the Technogenic impact to the Baikal Lake Ecosystem

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Journal of Geoscience and Environment Protection 2020年第11期8卷 112-118页

作者： Eugene N. Samarin Nataliia S. Kravchenko Oleg v. Zerkal Michael S. chernov irina A. Rodkina Geological Faculty Lomonosov Moscow State University Moscow Russia

Research is devoted to the problem of recycling waste of the Baikal Pulp and Paper Mill, whose activity has caused serious damage to the ecological environment of Lake Baikal and its environs. Grouting waste production is currently the most effective possible decision to the problem of pollutants, such as sludge-lignin and ash, in water objects and groundwater. The results on the grouting of liquid and solid waste from the Baikal Pulp and Paper Mill, represented by sludge lignin and ash, are presented. Cement, liquid glass, colloidal silica, ammonium persulfate, hydrogen peroxide were used as the main hardeners. Samples were formed by mixing the original waste with astringent. The strength in time, shrinkage, resistance to water were studied. Samples formed on the basis of colloidal silica solution have a maximum uniaxial compressive strength of 0.4 - 0.5 MPa, on the basis of liquid glass—0.2 - 0.3 MPa. Adding fine sand increases the strength by 1.5 - 1.7 times. Samples based on ammonium persulfate and hydrogen peroxide do not have sufficient strength. Adding fine quartz sand increases the strength up to 1.0 - 1.2 MPa.

关键词： Grouting Sludge-Lignin Colloidal Silica Liquid Glass Pollution of Lake Baikal

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investigation on low activated materials on the base of v-Ti-Cr alloys

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广东有色金属学报 2005年第2期15卷 305-305页

作者： Potapenko M. Shikov A. chernov v. Drobishev v. Gubkin i . A.A.Bochvar institute of inorganic Materials Moscow123060 Russia

Low activated materials on the base of vanadium are among the key materials for future fusion reactors. in the Russian Federation the long term National Program on the development of such vanadium alloys is under the ... 详细信息

关键词：铬钛合金活性材料显微结构热处理工艺

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不确定性及建议

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AMBiO－人类环境杂志 2004年第B11期33卷 450-455页

作者： Terry v.Callaghan Lars Olof Bjrn Yuri chernov Terry Chapin Torben R.Christensen Brian Huntley Rolf A.ims Margareta Johansson Dyanna Jolly Sven Jonasson Nadya Matveyeva Nicolai Panikov Walter Oechel Gus Shaver 寒江 Abisko Scientific Research Station Departnent of Cell and Organism Biology Lund University A.N.Severtsov institute of Evolutionary Morphology and Animal Ecology Russian Academy of Sciences institute of Arctic Biology University of Alaska Department of Physical Geography and Ecosystem Analysis GeoBiosphere Science Centre Lund University School of Biological and Biomedical Sciences University of Durham institute of Biology University of Troms Centre for Maori and indigenous Planning and Development Lincoln University Physiological Ecology Group Botanical institute University of Copenhagen Komarov Botanical institute Russian Academy of Sciences Stevens Technical University Global Change Research Group San Diego State University The Ecosystems Center Marine Biological Laboratory

在北极气候影响评估(ACiA)中,一项气候及紫外线B辐射变化对北极陆地生态系统影响的评估着重强调了预期中的变暖的深远意义,尤其是变暖在未来生态系统功能、生物多样性,以及对气候的反馈方面的深远意义。然而,尽管在有些地理区域和有些学... 详细信息

在北极气候影响评估(ACiA)中,一项气候及紫外线B辐射变化对北极陆地生态系统影响的评估着重强调了预期中的变暖的深远意义,尤其是变暖在未来生态系统功能、生物多样性,以及对气候的反馈方面的深远意义。然而,尽管在有些地理区域和有些学科,我们目前对气候和紫外线B辐射驱动下生态过程及生态变化的了解已算充分,但在其他区域及学科,这种了解是微弱的。即使随着北极地区研究成果的积累和新技术的引用,近来我们的预测能力已空前提高,我们目前的了解程度也还受到各种各样的不确定性的限制。这项评估是在每一种都含有不确定性的一系列方式方法,以及常常远非完整的数据集的基础上完成的。不确定性从各种方法和概念框架而来,从不可预测的意外事件、从对模型的缺乏验证、从未来温室气体排放及气候变化的一些特别情景的应用而不是预测而来。此项评估中,以减少不确定性为目的的建议比比皆是,而且涉及所有学科。然而,一再出现的主题是:在北极这样人烟稀少的偏远地区,环境变化及其影响的实验、观察及监测活动达到足够的空间广度和时间长度是极其重要的。

关键词：紫外线B辐射气候变化北极地区不确定性荒漠生态系统影响评估苔原陆地生态系统生态系统功能

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