Grigorii Valentinovich Samsonov

Obituaries

Grigorii Valentinovich Samsonov     

Relative position of limit cycles in an immune responsec

In this paper, a predator-prey model for immune response is proposed. We use the method of vector analysis to estimate the relative positions of the limit cycles in the antigen-antibody phase plane for the model.     

Surface energy-driven adhesion of two opposing microcantilevers

Summary This paper studies surface energy-driven adhesion of two parallel microcantilevers oriented in opposite directions. Adhesion becomes possible when an attached state of the two opposing cantilevers becomes an equilibrium state at which the release rate of the strain energy with respect to the attached length is equal to the surface energy per unit length. The analytical model developed here predicts that the critical values of surface energy for initial adhesion and full adhesion of two opposing cantilevers increase monotonically with increasing overlap length. This is attributed to the fact that increasing overlap length leads to a decrease in the unattached suspended length of the cantilevers and then an increase in the release rate of the strain energy, which requests a higher surface energy for adhesion of the two cantilevers. Therefore, the strength of two opposing cantilevers against adhesion can be enhanced by increasing the overlap length. When adhesion occurs, because of lower surface energy and shorter attached length, the attached state of two beams of small or moderate overlap length always has a higher total energy than the unattached straight beams before the full adhesion is reached. On the other hand, because of higher surface energy and longer attached length, the total energy of the attached state of two beams of large overlap length can be lower than the total energy of the unattached straight beams even before the full adhesion is reached. In particular, for the first time to our knowledge, the present results show quantitatively how much the critical values of surface energy density for adhesion of two opposing cantilevers are lower than the critical values of surface energy density for adhesion of a single cantilever attracted by a rigid substrate or other similar problems studied in the literature. These results could have significant consequences to MEMS design especially for combdrive technology.     

Evaluation of superposition technique for calculating cogging torque in permanent-magnet brushless machines

We evaluate the superposition method for calculating the cogging torque in permanent-magnet brushless machines, the resultant torque being synthesized from cogging torque components associated with a pair of magnets. Although finite-element analyses and measurements show that the resultant cogging torque cannot be synthesized directly from the torque components due to a single magnet, we use the concept of a fictitious single magnet to analytically establish the relationship between the cogging torque and key design parameters. The method is particularly useful in assessing the influence of the slot number and pole number combination.     

CSP连铸结晶器液位控制系统

介绍珠钢连铸采用Co60为放射源的结晶器液位控制系统配置、控制方式和控制算法．     

伦理视野中的经济制度与经济行为

任何一种经济制度或经济行为都要为社会成员提供尽可能多的利益需要,因为社会经济制度和经济行为的根本道德性原则或第一原则就是最大限度地满足社会成员的利益需要.从伦理学的视野来审视现阶段经济制度和经济行为有着重要的理论意义和现实意义.具体的经济行为有着道德的内涵,对它进行道德的评价和判断,有利于规范经济的运行秩序,促进社会主义市场经济的建设.     

Rare earth elements in CO_2-fluid inclusions in mantle Iherzolite

Trace elements including REE (Rare Earth Elements) in fluid inclusions in Iherzolite, olivine, orthopyroxene, and clinopyroxene have been determined by heating-decrepitation and ICP-MS (Element Type Inductively Coupled Plasma-Mass Spectrometry) method. Normalized CO2 fluid/chondrite data show that mantle fluids are rich in REEs, especially LREEs (Light Rare Earth Elements), several times or dozen times higher than mantle rocks and mantle minerals. There are close relationships among the REE data of olivine, orthopyroxene, clinopyroxene and 1herzolite. Compared to the data of chemical dissolution method, it is believed that REE data obtained from heating-decrepitation and ICP-MS technique are contributed by CO2 fluid inclusions. About 60% (mass fraction) of tiny inclusions are observed not to be decrepitated above 1000℃, so REE data obtained are only contributed by decrepitated inclusions. Mantle fluids rich in LREE play an important role in mantle metasomatism, partial melting and mineralization.     

Modification of High Performances of Polymer Cement Concrete

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活性炭共吸附现象对有机蒸气穿透容量的影响

在空气避有机蒸气的气相色谱分析方法研究中，为获得可靠的采样效果，探讨了活性炭对共存有机蒸气的共吸附与穿透容量的关系，试验了四种有机蒸气共存时和组分的有采样效率。结果表明，共吸附使所有共存有机蒸气的穿透容量下降，共吸附物质愈多，穿透窝量下降愈严重。对二种和四种有机蒸气的共吸附，使丙酮的穿透容量下降２１．９％和４１．７％，四组分共存时，丙酮，丁酮，环已酮、甲苯的穿透窝量分别为５．６、５．０、９．７、１     

高校校园网针对分布式攻击的检测与策略

对于分布式的校园网络来说,分布式入侵是主要危害。合理的、有针对性的使用各种入侵检测技术,对于防止计算机和网络资源的恶意使用行为,以及内部、外部用户的未授权活动,有着重要的意义。本文从校园网络的实际出发,根据校园网络的多发事件,提出了具体的检测策略。