Determining the Maximum-Performance Temperature of Hard-Alloy Cutting Inserts on the Basis of Their Electromagnetic Properties

Russian Engineering Research - The temperature dependence of the electromagnetic properties of hard tool alloys is studied experimentally. Temperature intervals corresponding to maximum alloy...     

Production of Cylindrical Gears by Means of Cutting Heads

Russian Engineering Research - The potential of cutting heads of various types in cutting cylindrical gears is analyzed. On that basis, the following gear-cutting systems are proposed: a...     

Interbunch extinction measurement at the BNL AGS for the KOPIO experiment

The KOPIO experiment at the BNL AGS required an extracted proton beam in which a debunched, coasting beam is forced between empty longitudinal RF buckets to form microbunches. The goal of the measurement described here was to obtain a low background determination of the fraction of protons coming from the AGS slowly extracted beam at times between microbunches (interbunch extinction). The effect on interbunch extinction of variations in the RF cavity voltage, the momentum dispersion of the beam and the main guide field voltage-ripple was studied. It was found that there exists a broad range of operating parameters that could allow the AGS to produce microbunches with the interbunch extinction better than the KOPIO experiment requirement. Results obtained in this study gave interbunch extinctions better than 10⁻⁵ (1%) of KOPIO's upper limit.     

Physics Performance of the Barrel RPC System of the HARP Experiment

The physics performance of the barrel RPC system of the HARP experiment is described. In the barrel two sets of fifteen identical resistive plate chambers (RPCs) have been operated in 2001 and 2002 as a part of the HARP experiment at the CERN PS accelerator. For the first time under real experimental conditions RPCs have bean applied for particle identification (PID) by measuring the particle's time-of-flight (ToF). The procedure developed for the RPC calibration, based on reconstructed tracks in the HARP Time Projection Chamber (TPC), is described in detail. Intrinsic RPC time resolutions of 141 ps and a combined time resolution of the large angle TOF system of 180 ps are obtained. The effective resolution of the comparison of predicted and measured ToF is 305 ps in the region of interest for this experiment. The PID capabilities of the system are demonstrated. An average efficiency of the RPC counters of about 97% is measured     

Purification of copper powders produced by cementation from the cementing metal

Conclusions A copper powder produced by cementing copper with iron from a sulfate solution can be purified from iron by treatment with a sulfuric acid solution. Reverse dissolution of copper in this process can be reduced by employing a protective atmosphere generated by the addition of sodium carbonate to the H₂SO₄, solution. A necessary condition for the effective purification of finely divided copper from the cementing metal is deposition of copper in loose form.Translated from Poroshkovaya Metallurgiya, No. 1(289), pp. 5–7, January, 1987.