Compounds for radionuclide imaging and therapy of malignant foci characterized by the increased angiogenesis

The literature data on the application and synthetic methods of compounds for imaging and therapy of malignant foci characterized by the increased angiogenesis are summarized.     

Supersonic Inviscid Corner Flows with Regular and Irregular Shock Interaction

The results of a numerical and analytical investigation of steady-state supersonic inviscid flows in corners formed by intersecting compression wedges are presented. The flows considered are symmetric about the corner bisector. The distinctive features of flow pattern formation related with the reflection of wedge-generated shocks from the bisector plane are studied. The wedge angles at which transition from regular to irregular shock reflection occurs are determined both numerically and analytically using the criteria available for plane flows; the data thus obtained are found to be in agreement. Flow patterns with irregular shock reflection, namely, single, transitional, and double Mach, as well as von Neumann reflection, are identified; they are similar to the known types of reflection for plane quasi-steady-state flows. Varieties of these types not observed in the plane flows are found to exist. The effects of the angle of inclination of the plane surfaces of the corner to the freestream direction, the sweep angle of the leading edges, and the dihedral angle are investigated. Some previously unknown parameters of corner configurations for which transition may occur in accordance with the von Neumann criterion are determined.     

气体团簇离子束两步能量修形法的平坦化效应

本文提出采用气体团簇离子束的两步能量修形法来改善4H-SiC(1000)晶片表面形貌.先用15 keV的高能Ar团簇离子进行整体修形,再用5 keV的低能团簇离子优化表面.结果表明,在相同的团簇离子剂量下,与单一15 keV的高能团簇处理相比,两步法修形后的表面具有更低的均方根粗糙度,两者分别为1.05 nm和0.78 nm.本文还以原子级平坦表面为研究对象,揭示了载能团簇引起的半球形离子损伤(弧坑)与团簇能量的关系,及两步能量修形法在弧坑修复中的优势.在原子力显微镜表征的基础上,引入了二维功率谱密度函数,以直观全面地给出材料的表面形貌特征及其随波长(频率)的分布.结果表明,经任何能量的团簇离子轰击的表面,在0.05—0.20μm波长范围内,团簇轰击都能有效地降低粗糙度,而在0.02—0.05μm范围内,则出现了粗化效应,这是由于形成了半球形离子损伤,但第二步更低能量的团簇离子处理可以削弱这种粗化效应.     

Peroxy-Containing Monomers as Coating Components Based on 1,1,2-Trichlorobuta-1,3-diene

Russian Journal of Applied Chemistry - The copolymerization of 1,1,2-trichlorobuta-1,3-diene with peroxide-containing acrylates and methacrylates in bulk at different temperatures, process time and...     

Mechanism of the photochemical reactions of substituted benzoquinones

Photoreactions of 2,6-dimethyl-, 2,6-di-tert-butyl-, and 2,6-diphenyl-1,4-benzoquinones with alcohols, organic acids, thioalcohols, amines (primary, secondary, and tertiary), cyclic ethers, tri- and tetraethoxysilanes are accompanied by the effect of chemical polarization of nuclei (CINDP) and lead, along with the formation of hydroquinones, to bicyclic and tricyclic structures and the products of radical substitution in the aromatic ring. The mechanisms of elementary photoreactions were elucidated. The intermediate excited states and radical structures were considered. For the first time permanent generation of radio waves in the course of the reversible photochemical reaction of substituted 1,4-benzoquinones with alcohols was detected.     

Oxidation of 6-methyl-2,4-dioxypyrimidine with selenious acid

The yield orotic aldehyde at the oxidation of 6-methyl-2,4-dihydroxypyrimidine was found to increase when selenious acid is used as an oxidizer. A comparative analysis of 6-methyl-2,4-dioxypyrimidine oxidation with selenium dioxide and selenious acid was performed using the ab initio quantum chemical method in the 6-31G** basis.     

Complexing of benzosemiquinone radicals with bivalent copper ions

Russian Journal of General Chemistry -