Survey, analysis and evaluation test on high voltage/current pulse transmission cables

A survey, analysis, and testing of available cable connector configurations were carried out in connection with transmission of high voltage/current to an exploding wire bridge. Transmission was desired at high efficiency with maximum cable flexibility, at minimum weight and size of the cable connector, with maximum cable length while maintaining applicable voltage/current pulse characteristics, and with due consideration to environmental parameters

A Study of single and multiphoton events in e+ e- collisions at center-of-mass energies of 161-GeV and 172-GeV

Events from electron-positron collisions where photons are the only particles detected in the final state are studied using the data collected by the ALEPH detector at LEP. The data consist of 11.1 pb \sp{-1} at $\sqrt{s} = 161$ GeV, 1.1 pb\sp{-1} at 170 GeV and 9.5 pb\sp{-1} at 172 GeV. The \rm e\sp+e\sp-\to\nu\bar\nu\gamma(\gamma) and \rm e\sp+e\sp-\to\gamma\gamma(\gamma) cross sections are measured. The data are in good agreement with predictions based on the Standard Model, and are used to set upper limits on anomalous photon production. Searches for supersymmetric particles in channels with one or more photons and missing energy have been performed. Cross-section upper limits are derived for two different Supersymmetry models. A lower limit of 71 GeV/c\sp2 at 95ib/zoneinfo/MET.L. is set on the mass of the lightest neutralino \rm\chi\sbsp{1}{0}\ (M\sb{\tilde e\sb{R}} = 1.5M\sb{\chi\sbsp{1}{0}} and \tau\sb{\chi\sbsp{1}{0}}\le 3 ns) for the Gauge-Mediated Supersymmetry Breaking model. Constraints on compositeness models and excited electrons are studied using the differential cross section for \rm e\sp+e\sp-\to\gamma\gamma(\gamma) events

Temperature measurements behind reflected shock waves in air

A radiometric method for the measurement of gas temperature in self-absorbing gases has been applied in the study of shock tube generated flows. This method involves making two absolute intensity measurements at identical wavelengths, but for two different pathlengths in the same gas sample. Experimental results are presented for reflected shock waves in air at conditions corresponding to incident shock velocities from 7 to 10 km/s and an initial driven tube pressure of 1 torr. These results indicate that, with this technique, temperature measurements with an accuracy of + or - 5 percent can be carried out. The results also suggest certain facility related problems

Magnetostratigraphy of Equatorial Pacific Site 503 Hydraulic Piston Cores

The paleomagnetic measurement procedure at Site 503 was similar to that described for Site 502 (See preceding chapter). Each core section was measured with the longcore spinner magnetometer at 10-cm intervals. In addition, one or more discrete samples were taken from each core section for measurement of the total magnetic vector and its stability against progressive AF demagnetization. There were noteworthy differences in conditions at Site 503, however, that affected the quality and interpretation of the magnetic data and require comment

Policy evaluation with temporal differences: a survey and comparison

Policy evaluation is an essential step in most reinforcement learning approaches. It yields a value function, the quality assessment of states for a given policy, which can be used in a policy improvement step. Since the late 1980s, this research area has been dominated by temporal-difference (TD) methods due to their data-efficiency. However, core issues such as stability guarantees in the off-policy scenario, improved sample efficiency and probabilistic treatment of the uncertainty in the estimates have only been tackled recently, which has led to a large number of new approaches. This paper aims at making these new developments accessible in a concise overview, with foci on underlying cost functions, the off-policy scenario as well as on regularization in high dimensional feature spaces. By presenting the first extensive, systematic comparative evaluations comparing TD, LSTD, LSPE, FPKF, the residual- gradient algorithm, Bellman residual minimization, GTD, GTD2 and TDC, we shed light on the strengths and weaknesses of the methods. Moreover, we present alternative versions of LSTD and LSPE with drastically improved off-policy performance

An improved approach to reinforcement learning in computer go

Monte-Carlo Tree Search (MCTS) has revolutionized, Computer Go, with programs based on the algorithm, achieving a level of play that previously seemed decades away., However, since the technique involves constructing a search tree, its performance t