Flowing gas, non-nuclear experiments on the gas core reactor

Flow tests were conducted on models of the gas core (cavity) reactor. Variations in cavity wall and injection configurations were aimed at establishing flow patterns that give a maximum of the nuclear criticality eigenvalue. Correlation with the nuclear effect was made using multigroup diffusion theory normalized by previous benchmark critical experiments. Air was used to simulate the hydrogen propellant in the flow tests, and smoked air, argon, or freon to simulate the central nuclear fuel gas. All tests were run in the down-firing direction so that gravitational effects simulated the acceleration effect of a rocket. Results show that acceptable flow patterns with high volume fraction for the simulated nuclear fuel gas and high flow rate ratios of propellant to fuel can be obtained. Using a point injector for the fuel, good flow patterns are obtained by directing the outer gas at high velocity along the cavity wall, using louvered or oblique-angle-honeycomb injection schemes

Taiwan’s 2016 Presidential/Vice Presidential and Legislative Election: Reflections on the Nature of Taiwan’s Politics and Shifts Therein

On Saturday January 16, 2016 voters in Taiwan (officially known as the Republic of China) went to the polls to cast ballots for candidates for president (and his or her running mate) and members of the Legislative Yuan (Taiwan’s lawmaking body of government). This was Taiwan’s fourteenth presidential election and its sixth wherein the electorate cast direct votes. It was the second that did not have an incumbent president or vice president in the race. It was the second election that resulted in a change of ruling parties. It was the first election to see the main opposition party, the Democratic Progressive Party (DPP), win a majority in the legislature. The DPP candidate attained the presidency handily. Arguably just as important, the DPP won the legislative half of the election by a clear margin; this was somewhat unexpected. The two solid wins meant that the DPP became the party in control for the first time. This afforded the DPP with the good fortune of unimpeded governance and an opportunity to profoundly change Taiwan politically and in other ways. Concerning the significance of this election, it is easy to make a case that it stands out among Taiwan’s many recent elections in a number of respects. This is true not only of the election results, but probably what lasting impact it will have

Taiwan’s 2014 Nine-in-One Election: Gauging Politics, the Parties, and Future Leaders

On Saturday November 29, 2014 voters in Taiwan (officially known as the Republic of China) went to the polls to cast ballots for mayors and city council members of the metropolitan cities, mayors and councilors of the counties and provincial cities, town- ship chiefs and councilors, aboriginal district chiefs and councilors, and borough and village chiefs. Sometimes called Taiwan’s “midterms”, these combined elections are held at four-year intervals, scheduled in between its national presidential/vice presidential and legislative elections. The midterms are now considered nearly as important as the latter elections, one of the reasons being as of 2014 all local elections are held at the same time. Students of Taiwan’s elections viewed the Democratic Progressive Party (DPP), for reasons inherent in the party’s makeup and philosophy, perennial disunity, and serious disagreements about the party’s stances toward China and the United States, as incapable of appealing to a broad segment of Taiwan’s electorate. This meant the KMT had an advantage. However, the Kuomintang (KMT) appeared fully capable of losing the election as reflected by the performances of a number of its members in the legislature, President Ma and his administration’s low popularity, and what many considered its poor record in governance. In addition, serious factionalism and centrifugal tendencies plagued the Ma administration and the Nationalist Party, and both lost ground on important issues to voters such as economic management, corruption, political reform, and some other matters that influenced voters. As the votes were counted, the media, election observers, and party leaders gave the victory with few caveats to the DPP and reported it was a loss for the KMT. In fact, most saw the election results as proof it was a big, even momentous, win for the DPP and a shellacking for the KMT. Many opined the election would have very profound consequences, including making it likely the DPP would win the 2016 election or elections. It would also impact relations with China and the United States. Finally, a majority of observers saw it as a plus for Taiwan’s democracy. This article evaluates these observations and predictions

Pion Production from Baked-Alaska Disoriented Chiral Condensate

We study the various stages of the evolution of chiral condensates disoriented via the ``baked-alaska'' mechanism, in which the condensates are described as the products of external sources localized on the light cone. Our analysis is based on the classical equations of motion of either the linear or the nonlinear sigma model. We use the associated framework of coherent states and, especially, their source functions to make the connection to the distribution functions for the produced particles. We also compare our classical approach with a mean-field calculation which includes a certain class of quantum corrections.Comment: replaced to correct misspelling of author's nam

The SUSY EW-like corrections to top pair production in photon-photon collisions

We studied the one-loop contributions of the gaugino-Higgsino-sector to the process of top-pair production via $\gamma \gamma$ fusion at NLC in frame of the Minimal Supersymmetric Model(MSSM). We find that the corrections to $\gamma \gamma \to t\bar{t}$ and $e^+ e^- \to \gamma \gamma \to t\bar{t}$ are found to be significant and can approach to a few percent and one percent, respectively. Furthermore, the dependences of the corrections on the supersymmetric parameters are also investigated. The corrections are not sensitive to $M_{SU(2)}$ (or $|\mu|$) when $M_{SU(2)}~>>~|\mu|$ (or $|\mu|~>>~M_{SU(2)}$) and are weakly dependent on the $\tan{\beta}$ with $M_Q$ (or $|\mu|$) being large enough. But they are sensitive to the c.m.s. energy of the incoming photons.Comment: LaTex, 33 pages, 8 Eps figuer