The Large High-Altitude Air Shower Observatory (LHAASO) is being built at Haizi Mountain, Sichuan province of China an altitude 4410 meters. One its main goals to survey the northern sky for very-high-energy gamma ray sources via ground-based water Cherenkov detector array (WCDA). 900 8-inch photomultiplier tubes (PMTs) CR365-02-1 from Beijing Hamamatsu Photon Techniques INC. (BHP) are installe...

Thin-walled tubular structures are widely used in industries such as automotive, aerospace and military because of their lightweight excellent performance under different loading conditions. This study aimed to investigate the lateral crushing square aluminium tubes filled with cores (honeycomb, polyurethane foam mixed these two fillers). Different failure modes tested have been observed they p...

We investigate the growth of self-organized tubes formed by injection of metal salt solutions into silicate solution. The wall thickness increases strictly in an inward direction and obeys square root functions suggesting the presence of a traveling reaction-diffusion front in the radial direction. We also demonstrate the construction of multi-layered tubes.

The model R5912-20MOD photomultiplier tube(PMT) is made for cryogenic application by Hamamatsu. In this paper, we report on the measurement of relative quantum efficiency (QE) PMT at liquid argon(LAr) temperature. Furthermore, a specially designed setup and relevant test method are introduced. QE measured in visible wavelengths with emerged high purity nitrogen atmosphere. results show that cha...

the brass tubes with foam cores of alsi7sic3, alsi7sic3fe1 and alsi7sic3fe3 were produced as the crush-boxes with circle and square cross-section. then axial compressive behavior and energy absorption capability of the foam-filled tubes were investigated during the quasi-static progressive plastic buckling. the uniaxial compressive stress–strain curves of the foam-filled brass tubes exhibited t...

The High-Altitude Water Cherenkov (HAWC) observatory is a second-generation continuously operated, wide field-of-view, TeV gamma-ray observatory. HAWC and its analysis techniques build on experience of the Milagro experiment in using ground-based water detectors for astronomy. located Sierra Negra volcano M\'exico at an elevation 4100 meters above sea level. completed principal detector consist...

The origin and nature of ultrahigh-energy cosmic rays (UHECRs) are uppermost importance in astroparticle physics. Motivated by the need for an unprecedented aperture further advancements, Fluorescence detector Array Single-pixel Telescopes (FAST) is a prospective next-generation, ground-based UHECR observatory that aims to cover enormous area deploying large array low-cost fluorescence telescop...

impact is one of the most important subjects which always have been considered in mechanical science. nature of impact is such that which makes its control a hard task. therefore it is required to adopt a safe and secure mechanism for transferring the impact to other vulnerable parts of a structure, when it is necessary. one of the best methods of absorbing impact energy is using thin-walled tu...