Errors in Clamping Thin-Walled Pipe

Russian Engineering Research - The errors arising when thin-walled pipe is clamped in a three-jaw chuck are determined. The wraparound jaws are bored so that their internal diameter is consistent...     

Carbon-ceramic composite materials with protective erosion-resistant coatings

Results are presented for the development of production examples of creating refractory materials and structures made from them for the metallurgical industry from carbon and ceramic carbide-forming substances. Practical recommendations are proposed for creating integral structures of new refractory materials for high-temperature processes with a limiting operating temperature of the corresponding carbide protective coatings that exceeds the operating temperatures in air for graphite structural materials. by more than 1000°C. Experimental studies are performed on 16 prepared reactor units for high-temperature chemical processes with an absolute pressure within a reactor of 0.3 MPa and an operating temperature of 900°C. All of the technical specifications for a chemical reactor for air tightness are fulfilled with a reserve of operating capacity. __________ Translated from Novye Ogneupory, No. 2, pp. 47–53, February, 2007.     

相变诱导塑性汽车用钢的发展现状与趋势

论述了相变诱导塑性(TRIP)钢的发展现状及其在汽车工业上的应用,重点讨论了 TRIP 效应的机理及TRIP钢性能的影响因素。介绍了2种采用新型工艺(低温贝氏体转变和淬火-碳分配工艺)的 TRIP 钢,并且通过对TRIP钢研究的最新数据,对比了2种工艺下TRIP钢的高速拉伸性能;最后对汽车用 TRIP 钢的研究方向进行了展望。     

Impact of the water treated with silevit on the indices of peripheral blood of irradiated animals

We have investigated the impact of the water treated with silevit on oxidative homeostasis and the composition of peripheral blood of mice irradiated at a dose of 1.0 Gy. It has been found that the course consumption by animals of water modified with silevit results in a decrease of the intensity of free-radical processes in peripheral blood and the change of its cellular composition.     

Grating coupling elements for high-Q resonators and rectangular waveguides of the millimeter wave band

Techniques for electrodynamic-level calculation of slot-grating wideband coupling elements for single-mode waveguides are developed. New coupling devices that ensure the obtaining of a voltage standing-wave ratio of 1.6 in the entire tuning range of a resonator without readjustment of the coupling element are designed and tested experimentally. It is found that application of new coupling devices in resonators do not deteriorate the loaded Q factor of the resonator.     

Oliner models for quasioptical resonator to rectangular waveguide coupling elements

It has been shown that Oliner models, traditionally used for the analysis of microwave integrated circuits, can be applied to the calculation of electrodynamic characteristics of elements for coupling open resonators with rectangular waveguides. The experiments have indicated a high accuracy with the calculation technique developed.<>     

Computer simulation of stiff-chain polymers

A review of studies on the computer simulation of the phase behavior of various stiff-chain polymer systems is presented. Methods for calculating phase diagrams of a polymer solution in a computer experiment are discussed, including the methods of extended ensembles, entropic simulation, and the Wang-Landau algorithm to obtain the density-of-states function. The authors’ original results on studying the intramolecular orientational and spatial ordering of monomer units in a single stiff-chain macromolecule in the bulk and near a planar adsorbing surface by means of the Wang-Landau algorithm and using the bond-fluctuation lattice model are presented. Corresponding state diagrams are presented for these two cases. For systems of multiple chains, the phenomenon of nematic liquid-crystalline ordering in semi-dilute solutions in the bulk and in a planar layer is considered, and the phase diagrams for these cases are presented. A survey of the published data on some other promising directions of investigation of stiff-chain polymer systems is presented.