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Selection of shaped charges parameters for producing aluminum particles with velocities in the range of 2.5-16 km/s

Defence Technology（防务技术） 2024年第8期38卷 126-135页

作者： Vladimir I.Kolpakov Sergey V.Fedorov ekaterina p.vinogradova Irina A.Bolotina Bauman Moscow State Technical University Moscow 105005Russia

Testing rocket and space technology objects in ground conditions for resistance to the impact of meteoroids and fragments of space debris can be carried out using shaped charges. To substantiate the design parameters of shaped charges that ensure the formation of aluminum particles in a wide velocity range(from 2.5 to 16 km/s), numerical modeling of the formation process was carried out within the framework of a two-dimensional axisymmetric problem of continuum mechanics using three different computing codes to increase the reliability of the results. The calculations consider shaped charges with a diameter of 20-100 mm with aluminum liners of various shapes. It is shown that the formation of particles with velocities close to the lower limit of the considered range is ensured by gently sloping segmental liners of degressive thickness. To form higher-velocity particles with velocities over 5 km/s, it is proposed to use combined liners, the jet-forming part of which has the shape of a hemisphere of constant thickness or the shape of a semi-ellipsoid or semi-superellipsoid of rotation of degressive thickness.

关键词： Space debris Meteoric impact Explosion Shaped charge High-velocity aluminum element Segmental liner Combined liner Numerical simulation

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Diagnosis of breast cancer by analysis of sialic acid concentrations in human saliva by surface-enhanced Raman spectroscopy of silver nanoparticles

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Nano Research 2017年第11期10卷 3662-3670页

作者： Aida Hernandez-Arteaga Jose de Jeses Zermeno Nava Eleazar Samuel Kolosovas-Machuca J. Jesus Velazquez-Salazar ekaterina vinogradova Miguel Jose-Yacaman Hugo Ricardo Navarro-Contreras Coordinacion para la Innovacion y Aplicacion de la Ciencia y la Tecnologia(CIACYT) Universidad Autonoma de San Luis Potosi(A)lvaro Obregon 64 San Luis Potosi S.L.P.78000 Mexico Division de Gineco-Obstetricia Hospital Central Dr.Ignacio Morones Prieto Ave.Venustiano Carranza 2395 Zona Universitaria San Luis Potosi S.L.P.78290 Mexico Department of physics and Astronomy University of Texas at San Antonio San Antonio TX 78249 USA

Breast cancer is the most common type of malignant tumor among women and their second leading cause of cancer-related *** most common method for screening and diagnosis is ***,two main problems have been ***,the dose of radiation received during the test prevents the method from the use on women who are 〈 40 years ***,there can be mammogram failure owing to the lack of tumor contrast with the fibrous ***,there is a need for screening methods that will help to identify high-risk *** developed a biological marker test that can help to identify *** levels of sialic acid （SA） in saliva are known to correlated with breast *** this study,we evaluated the feasibility of Raman spectroscopy as a method for quantification of SA in saliva,using citrate-reduced silver nanoparticles （cit-Ag-Nps） as a surface-enhanced Raman spectroscopy （SERS） *** of SA was accomplished by measuring its intensity in saliva and comparing it with a calibration curve of SA *** mean SA concentration in saliva was found to be significantly higher among 100 breast cancer patients （18.3 ＆#177; 9.4 mg＆#183;dL-1;mean ＆#177; SD） than among 106 healthy controls （3.5 ＆#177; 1.0 mg＆#183;dL-1）.The SERS test showed sensitivity of 94% and specificity 98% for detection of patients with breast cancer,assuming that SA concentration 〉 7 mg＆#183;dL-1 is a cutoff for positive test *** findings prove the usefulness of this SERS technique as a simple,convenient,and highly sensitive method of quantitative analysis of SA in *** simplicity of this nanotechnological test may help to substantially reduce the mortality among patients with breast cancer by providing women with a simple,noninvasive screening test that can be applied regardless of age or density of breast tissue.

关键词： breast cancer surface-enhanced Raman spectroscopy (SERS) Raman nanoparticles sialic acid

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对“年画”概念、定义及风格的商榷:俄罗斯汉学角度

年画研究

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年画研究 2023年第1期 1-14页

作者： [俄罗斯]维诺格拉多娃 [俄罗斯]叶可佳俄罗斯科学院图书馆布良斯克国立大学俄罗斯科学院中国与当代亚洲研究所

一、“年画”的概念、定义20世纪下半叶起,“中国民间木版画”被学术界称呼为“年画”。由于笔者对“年画”作为术语的准确性产生疑问,而动心对“中国木版画”在俄罗斯汉学研究中的应用作出反省和核查,并讨论俄罗斯学术界对“民间木版... 详细信息

一、“年画”的概念、定义20世纪下半叶起,“中国民间木版画”被学术界称呼为“年画”。由于笔者对“年画”作为术语的准确性产生疑问,而动心对“中国木版画”在俄罗斯汉学研究中的应用作出反省和核查,并讨论俄罗斯学术界对“民间木版画”现象的理解及阐述。参考19世纪—20世纪初的文献后,笔者发现当时的“中国木版画”收集者基本没有留下木版画相关的记录。因此,无法判断用什么词汇描述民间木版画1。

关键词：民间木版画俄罗斯汉学年画收集者

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