The Xl;, Es mass difference, Dm —= (Mz-Ms)c /h, has been redetermined in a highstatistics experiment performed at the zero-gradient synchrotron of Argonne National Laboratory, using the "gap method" originally developed at Princeton. Two independent measurements, using B4C and Cu, respectively, as regenerators, were performed and gave consistent results. Their mean is Am = (0.542+0.006) x 10 0 ...

An epithermal neutron camera based on energy-filtered imaging with gas electron multipliers was developed. Epithermal neutron imaging is achievable without time-of-flight detection of neutrons by using a resonance filter and a thermal neutron absorber. This technique is applicable to compact accelerator-based neutron sources. Blurring of epithermal neutron images caused by neutron scattering in...

A W: B4C multilayer phase retarder has been designed and characterized which shows a nearly constant phase retardance between 640 and 850 eV photon energies when operated near the Bragg condition. This freestanding transmission multilayer was used successfully to determine, for the first time, the full polarization vector at soft x-ray energies above 600 eV, which was not possible before due to...

In this study, aluminum (Al) matrix reinforced with micro-particles (30 µm) and nano-particles (50 nm) boron carbide (B4C) were used to prepare Al-2.5%wt., B4C nano-composite and micro-composite, respectively, using mechanical alloying method. The mixed powders were mechanically milled at 5, 10, 15 and 20 hrs. The XRD results indicated that the crystallite sizes of both the micro-composite and ...

Present work, evaluates the effects of Sea shell and B4C powder on mechanical behavior aluminium material (Al 6082). Stir casting method was used to fabricate a hybrid composite Al 6082 with sea B4C. A linear reciprocating tribometer evaluate wear friction behavior. The addition particles, resulted in 7-13 % reduction coefficient 32-43 improvement resistance as compared alloy. average Vicker ha...

Aluminium—boron carbide metal matrix composites (Al-B4C MMCs) belong to the class of materials extensively used in nuclear industry as a thermal neutron absorber spent fuel casks. This article investigates novel production method Al-B4C MMCs—Friction Stir Additive Processing (FSAP)—as an alternative casting or sintering. FSAP is derived from friction stir welding, which can be local modificatio...

A significant improvement of the mechanical performance was observed following introduction rare earth oxides in ZrB2-based ultra-high temperature ceramic matrix composites (UHTCMCs), resulting formation ternary boro-carbides general formula REB2C2, belonging to a new class layered compounds akin MAX phases. These phases possess high melting points and could be responsible for toughening UHTCMC...

PENENTUAN POSISI IRADIASI BATU TOPAZ DENGAN KAPSUL DAN PENGARAH BORON KARBIDA (B4C) DI REAKTOR RSG-GAS MENGGUNAKAN PROGRAM BATAN-2DIFF. Secara rutin iradiasi pewarnaan batu topaz di reaktor dilakukan pada fasilitas irradiation position (IP). Adanya permintaan target lain yang sama, menyebabkan perlu adanya pengembangan baru dapat digunakan sebagai pengganti topaz. Hal ini grid berilium reflekto...