Engineering prediction of turbulent skin friction and heat transfer in high-speed flow

A large collection of experimental turbulent-skin-friction and heat-transfer data for flat plates and cones was used to determine the most accurate of six of the most popular engineering-prediction methods; the data represent a Mach number range from 4 to 13 and ratio of wall to total temperature ranging from 0.1 to 0.7. The Spalding and Chi method incorporating virtual-origin concepts was found to be the best prediction method for Mach numbers less than 10; the limited experimental data for Mach numbers greater than 10 were not well predicted by any of the engineering methods except the Coles method

Turbulent skin friction and heat-transfer charts adapted from the Spalding and Chi method

Local and average skin friction and heat transfer on flat plates in air - chart

Experiments with hypersonic turbulent boundary layers on flat plates and delta wings

Hypersonic turbulent boundary layers on flat plates and delta wing

Onset of Collective Oscillation in Chemical Turbulence under Global Feedback

Preceding the complete suppression of chemical turbulence by means of global feedback, a different universal type of transition, which is characterized by the emergence of small-amplitude collective oscillation with strong turbulent background, is shown to occur at much weaker feedback intensity. We illustrate this fact numerically in combination with a phenomenological argument based on the complex Ginzburg-Landau equation with global feedback.Comment: 6 pages, 8 figures; to appear in Phys. Rev.

Hypersonic laminar viscous interaction effects on the aerodynamics of two-dimensional wedge and triangular planform wings

Hypersonic laminar viscous interaction effects on aerodynamics of two-dimensional wedge and triangular planform wing

Virtual Structure Constants as Intersection Numbers of Moduli Space of Polynomial Maps with Two Marked Points

In this paper, we derive the virtual structure constants used in mirror computation of degree k hypersurface in CP^{N-1}, by using localization computation applied to moduli space of polynomial maps from CP^{1} to CP^{N-1} with two marked points. We also apply this technique to non-nef local geometry O(1)+O(-3)->CP^{1} and realize mirror computation without using Birkhoff factorization.Comment: 10 pages, latex, a minor change in Section 4, English is refined, Some typing errors in Section 3 are correcte

On the formation of the welding seams with high speed

Целью настоящей работы является определение направлений исследований по установлению возможности повышения качества формирования сварочных швов с повышенной скоростью формирования тела шва. В статье вопрос решается путём отклонения сварочной дуги углом вперед, поперечным магнитным полем. Дополнительное магнитное поле в зоне сварки генерируют, пропуская часть сварочного тока по присадочной проволоке. Проволока подается в сварочную ванну позади дуги параллельно электроду в плоскости свариваемого стыка, в направлении, противоположном току дуги. Проведенный анализ отечественных и зарубежных литературных источников по рассматриваемой теме показал, что современный подход к определению влияния на повышение качества формирования сварочных швов с повышенной скоростью формирования тела шва, за счет дополнительного поперечного магнитного поля является актуальным в настоящее время и недостаточно изучен. Приведены сведения о формировании тела шва при скоростной сварке вольфрамовым электродом с присадочной проволокой, которые могут быть использованы для повышения производительности сварочных работ.The aim of this work is to determine the areas of research to establish the possibility of improving the quality of the formation of welds with an increased rate of formation of the joint body. In the article the problem is solved by the deviation of the arc angle forward transverse magnetic field. Additional magnetic field generated in the welding zone by passing part of the welding current for the filler wire. The wire is fed into the weld puddle behind the arc electrode in the plane parallel to the welded joint, in a direction opposite to the arc current. The analysis of domestic and foreign literature on the topic has shown that the modern approach to determine the effect on the improvement of quality of formation of welds with an increased rate of formation of the joint body, due to the additional transverse magnetic field is relevant in the present and not fully understood. Information is given about the formation of a seam in the tungsten electrode welding with filler wire, which can be used to improve the performance of welding

Biochem Soc Trans

Abnormal protein aggregation and intracellular or extracellular accumulation of misfolded and aggregated proteins are key events in the pathogenesis of different neurodegenerative diseases. Furthermore, endoplasmic reticulum stress and impairment of the ubiquitin-proteasome system probably contribute to neurodegeneration in these diseases. A characteristic feature of AD (Alzheimer's disease) is the abnormal accumulation of Abeta (amyloid beta-peptide) in the brain. Evidence shows that the AD-associated PS (presenilin) also forms aggregates under certain conditions and that another AD-associated protein, ubiquilin-1, controls protein aggregation and deposition of aggregated proteins. Here, we review the current knowledge of ubiquilin-1 and PS in protein aggregation and related events that potentially influence neurodegeneration