First axion dark matter search with toroidal geometry

We firstly report an axion haloscope search with toroidal geometry. In this pioneering search, we exclude the axion-photon coupling $g_{a\gamma\gamma}$ down to about $5\times10^{-8}$ GeV$^{-1}$ over the axion mass range from 24.7 to 29.1 $\mu$eV at a 95\% confidence level. The prospects for axion dark matter searches with larger scale toroidal geometry are also considered.Comment: 5 pages, 5 figures, 1 table and to appear in PRD-R

Development of New Products by DEMATEL

In this study, the consumer of the glass coffee stir bar design was used as the research object, and DEMATEL (Decision-Making Trial and Evaluation Laboratory) was used to explore the causality and importance of the evaluation factors for the purchase decision. The study found that the three most important key assessment factors before the purchase decision of glass coffee stir bars were ‘beautiful’, ‘operability’, and ‘durability’; ‘beauty’ was the main influencing factor; ‘operability’ – this is the main factor affected. In addition, glass coffee stir bars are the three most important key assessment factors before the general consumer purchase decision. Therefore, it is recommended to use this method to verify the case study of glass coffee stirrer bar designs, and to study the possible development directions for evaluation. This model process can not only quantitatively evaluate the simple factors of complex interaction factors, but the results can also be used as a design to determine the direction of future development.     Keywords: modular design, product family, interpretive structural model, product desig

Transient rocket-engine gas flow in soil

As a result of an examination of the behavior of soils subjected to rocket and jet exhaust gases. it was concluded that the gas pressure in the pores of the soil played an important part in the process of soil removal which occurred. Consequently, a numerical study of axially symmetric isothermal nonlinear gas flow ill a porous medium was undertaken. The paper presents the results and interpretations of the calculations for the particular boundary pressure conditions developed by a Surveyor spacecraft vernier engine mounted 12 in, above a granular material

Particle acceleration and the origin of gamma-ray emission from Fermi Bubbles

Fermi LAT has discovered two extended gamma-ray bubbles above and below the galactic plane. We propose that their origin is due to the energy release in the Galactic center (GC) as a result of quasi-periodic star accretion onto the central black hole. Shocks generated by these processes propagate into the Galactic halo and accelerate particles there. We show that electrons accelerated up to ~10 TeV may be responsible for the observed gamma-ray emission of the bubbles as a result of inverse Compton (IC) scattering on the relic photons. We also suggest that the Bubble could generate the flux of CR protons at energies > 10^15 eV because the shocks in the Bubble have much larger length scales and longer lifetimes in comparison with those in SNRs. This may explain the the CR spectrum above the knee.Comment: 5 pages, 4 figures. Expanded version of the contribution to the 32nd ICRC, Beijing, #0589. To appear in the proceeding

Prediction of the Feed Values of Maize Silage by Near Infrared Reflectance Spectroscopy

Until recently, feed evaluation of silages in official laboratories and feed factories was based on cutting date, chemical composition and the ammonia fraction. However, in vitro techniques have been developed based on rumen fluid or commercial enzymes to replace laborious, time-consuming and expensive digestibility experiments with animals. In this study the possibility of using near infrared reflectance spectroscopy (NIRS) to predict the chemical composition and digestibility of maize silage was examined