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Choi, June-Yeol,Kozlov, Mikhail-A. 한국곤충학회 2001 Entomological Research Vol.31 No.4
검정알벌과의 분류동정 연구를 통해 한국 미기록아과인 정수리검정알벌아과(신칭, Teleasinae)에 속하는 창살검정알벌(신칭, P. nefrens Kononova)과 이랑검정알벌(신칭, P. sulcatus Kozlov)을 발견하여 한국미기록종으로 보고한다. Two Proteleas species, P. nefrensKononova and P. sulcatus Kozlov, are recorded for the first time in Korea. Teleasinae, which includes these two Proteleas wasps, is also a newly-recorded subfamily in Korea.
ON REGULARITY OF SOLUTIONS OF THE DIRICHLET PROBLEM FOR THE POLYHARMONIC OPERATOR
Kozlov, Vladimir Korean Mathematical Society 2000 대한수학회지 Vol.37 No.5
Polyharmonic operator with Dirichlet boundary condition is considered in a n-dimensional cone. The regularity properties of weak solutions are studied. In particular, it is proved the Holder contionuity of solutions near the vertex of the cone for dimensions n=2m+3,2m+4, where 2m is the order of the polyharmonic operator.
New Species of the Genus Fusicornia Risbec (Hymenoptera: Scelionidae) from Korea
Park, June-Yeol,Mikhail A. Kozlov Korean Society of Applied Entomology 2001 Journal of Asia-Pacific Entomology Vol.4 No.2
Mikhail A. Kozlov Zoological Institute, Russian Academy of Sciences, St. Petersburg A new species, Fusicornia koreica sp. n., from Korea is described and illustrated. This species is distinguished from F. indica of India and the key for discrimination is presented. This is the first record of the genus in the Palaearctic region.
Magnetic Properties of Epitaxial [Pd/Co/CoO]n Superlattices
A. G. Kozlov,A. F. Shishelov,A. A. Turpak,M. A. Kuznetsova,A. V. Prikhodchenko,A. V. Davydenko,E. V. Tarasov,N. N. Chernousov,A. V. Ognev,A. S. Samardak 한국자기학회 2024 Journal of Magnetics Vol.29 No.1
Here, the investigation of the structural features, magnetic properties, and domain structure of multilayer superlattices prepared by molecular beam epitaxy and partial oxidation of magnetic layers is presented. The influence of the number of repetitions on the morphology of the interfaces is investigated. It is also shown that the epitaxial growth of the Pd and Cu layers is retained when growing over oxide layers. The paper presents the dependences of the coercive force and magnetic anisotropy energy and explains their behavior. The domain structure is studied by the magnetooptical Kerr effect and magnetic force microscopy. The possibilities of modifying the domain structure into skyrmion lattices by local action with a magnetic probe and without an external magnetic field are demonstrated.
Study of the dynamics of changes in the thermal conductivity coefficient of organic deposits
Ilyushin Pavel,Vyatkin Kirill,Kozlov Anton 한국자원공학회 2023 Geosystem engineering Vol.26 No.6
Ensuring flow in an oil field is one of the most costly problems in oil production and transportation. The fight against the formation of paraffin deposits consists both in the application of methods for the prevention and removal of deposits, and in the modeling of this process. An important parameter for the application of some technologies for preventing the formation of deposits and modeling the temperature regime of the pipeline is the coefficient of thermal conductivity of these deposits. The paper presents a study of the influence of the thermal conductivity of organic deposits on the rate of their formation, measured for 5 hours at the Cold Rod installation. According to the research results, it was found that over time, the thermal conductivity of organic deposits increases, while the rate of deposit formation decreases significantly. This process is explained by an increase in temperature on the surface of deposits due to their compaction and displacement from the volume of the liquid phase. The results obtained are extremely important in modeling the process of deposit formation and modeling a number of technologies to combat them.
Influence of an Unfavourable Pressure Gradient on the Breakdown of Boundary Layer Streaks
Chernoray, V. G.,Kozlov, V. V.,Lee, I.,Chun, H. H. IOS Press 2007 JOURNAL OF VISUALIZATION Vol.10 No.2
<P>Breakdown of boundary layer streaks is studied experimentally and compared at zero and adverse (positive) streamwise pressure gradients on a wing under fully controlled experimental conditions. The varicose mode of streak breakdown is found to be a dominant mode in the case of the adverse pressure gradient. A strong influence of pressure gradient upon the development of the streak and the secondary instability is revealed. The unfavourable pressure gradient is shown to alter the critical streak amplitude, the dispersion properties of the streak and the secondary disturbance, as well as attained maximum amplitudes for both the streak and the secondary disturbance. </P>
Electrical Power From Nanotube and Graphene Electrochemical Thermal Energy Harvesters
Kang, Tae June,Fang, Shaoli,Kozlov, Mikhail E.,Haines, Carter S.,Li, Na,Kim, Yong Hyup,Chen, Yongsheng,Baughman, Ray H. WILEY‐VCH Verlag 2012 Advanced functional materials Vol.22 No.3
<P><B>Abstract</B></P><P>Nanocarbon‐based thermocells involving aqueous potassium ferro/ferricyanide electrolyte are investigated as an alternative to conventional thermoelectrics for thermal energy harvesting. The dependencies of power output on thermocell parameters, such as cell orientation, electrode size, electrode spacing, electrolyte concentration and temperature, are examined to provide practical design elements and principles. Observation of thermocell discharge behavior provides an understanding of the three primary internal resistances (i.e., activation, ohmic and mass transport overpotentials). The power output from nanocarbon thermocells is found to be mainly limited by the ohmic resistance of the electrolyte and restrictions on mass transport in the porous nanocarbon electrode due to pore tortuosity. Based on these fundamental studies, a comparison of power generation is conducted using various nanocarbon electrodes, including purified single‐walled and multi‐walled carbon nanotubes (P‐SWNTs and P‐MWNTs, respectively), unpurified SWNTs, reduced graphene oxide (RGO) and P‐SWNT/RGO composite. The P‐SWNT thermocell has the highest specific power generation per electrode weight (6.8 W/kg for a temperature difference of 20 °C), which is comparable to that for the P‐MWNT electrode. The RGO thermocell electrode provides a substantially lower specific power generation (3.9 W/kg).</P>