http://dspace.nbuv.gov.ua:80/handle/123456789/114735 2026-04-05T09:43:26Z 2026-04-05T09:43:26Z Zhi-gang Li Liang-ping Qiu Ji-zhong Liu Jian-xiong Ye Di-qing Wan http://dspace.nbuv.gov.ua:80/handle/123456789/121491 2017-06-20T06:02:23Z 2016-01-01T00:00:00Z

The influence of rotating magnetic field on the welding arc motion status Zhi-gang Li; Liang-ping Qiu; Ji-zhong Liu; Jian-xiong Ye; Di-qing Wan A device generating rotating magnetic field is designed on the bas is of the mechanism of a rotating magnetic field. A rotating magnetic field and electric arc jointing together simulation is studied in this paper to elaborate arc characteristics and behavior under the action of a rotating magnetic field. The rotation radius of the arc are inversely proportional to the rotational frequency of the magnetic field. It is proportional to the field current. Due to constraint function of its own magnetic field of underwater wet welding arc. The influence on the underwater welding arc is smaller than the air welding arc while the magnetic field rotation frequency and magnetic field intensity is changed.

2016-01-01T00:00:00Z Khimchenko, S.V. Eksperiandova, L.P. http://dspace.nbuv.gov.ua:80/handle/123456789/121490 2017-06-20T06:01:17Z 2016-01-01T00:00:00Z

Capability of separate determination of colored components in their mixture using digital RGB-colorimetry Khimchenko, S.V.; Eksperiandova, L.P. One of the inalienable steps in manufacturing of functional materials is the operational control of traces of toxic heavy metals such as Fe(III) and Co(II) which are present in industrial waste water. The optimal variant for requirements of the analysis in-situ and "green chemistry" is using of environmentally friendly sorbents for preconcentration with simple procurable and portable equipment. Colorimetric characteristics of colored components on the example of thiocyanate complexes of Fe(III) and Co(II) by means of digital RGB-colorimetry have been studied. Algorithm for the colorimetric determination of each of the said components at their joint presence in water using measurements of only three color parameters of the colored mixture was developed. Separation factor of the analytical signal is estimated.

2016-01-01T00:00:00Z Hongwen Sun Xiaochao Ma Chenhui Hu http://dspace.nbuv.gov.ua:80/handle/123456789/121489 2017-06-15T00:05:44Z 2016-01-01T00:00:00Z

Stamp stress analysis with low temperature nanoimprint lithography Hongwen Sun; Xiaochao Ma; Chenhui Hu High temperature nanoimprint lithography has the drawback of long process cycle, demoulding difficulty, polymer degradation, thermal stress. Low temperature nanoimprint lithography (LTNIL) can avoid these problems. LTNIL is also ideal for manufacturing biological compatibility samples since the samples do not sustain high temperature. However, LTNIL need to optimize the press parameters in order to fully transfer patterns. Finite Element Method (FEM) is an excellent approach to examine the filling process. The stamp stress was simulated from four points of view, imprint pressure, imprint temperature, stamp pattern and stamp material. It was found that the stress in the stamp corners is especially bigger than other areas, the stress increases with the stamps aspect ratio increases, and stress distribution is more uniform for dense pattern stamp.

2016-01-01T00:00:00Z Yuekan Zhang Peikun Liu Xinghua Yang Junru Yang Linjing Xiao http://dspace.nbuv.gov.ua:80/handle/123456789/121488 2017-06-15T00:05:53Z 2016-01-01T00:00:00Z

Study on effect of the inner vortex finder length on the flow properties of the hydrocyclone with double vortex finders Yuekan Zhang; Peikun Liu; Xinghua Yang; Junru Yang; Linjing Xiao The traditional hydrocyclone can only obtain two products: overflow and underflow. In the paper, we propose three-products hydrocyclone with double vortex finders. The hydrocyclone is designed with two coaxial overflow tubes with different diameters. During overflow, light and fine particles exit from the inner overflow tube. The mid-size particles overflow from the outer overflow tube, and the coarse particles through the underflow pipe. Therefore, one classification can obtain three different narrow-grade-classification products. The inner vortex finder length is the important influent factor on the flow performance of the hydrocyclone. This paper is mainly focused on the study of the flow field of both the air and the liquid phase, and of the effects of the inner vortex finder length on the velocity field, pressure field and the air column of the hydrocyclone with double vortex finders.

2016-01-01T00:00:00Z