November 20, 2009. Along with so many colleagues, I am deeply saddened by the news of Paul Tseng’s disappearance while on a kayak trip on the Jinsha River in China on August 13, 2009. Many of us have many wonderful memories of times spent with Paul – visits, collaborations, conversations, conference social events – and many have been influenced by his scholarly, incisive, and prolific research....

77 INTRODUCTION Delays at bus stops and signals have a negative impact on bus speeds, even if priorities are provided in the form of bus lanes or busways. On the other hand, the positive influence of well-designed bus stops or signals is irrelevant if buses do not have appropriate priority to move freely along street sections. Therefore, it is necessary to consider all the components of bus inf...

Cases of neural tube defects born in Western Australia during the years 1966-81 were identified from hospital records and death certificates. The overall rate for the 16 year period was 1.81 cases of neural tube defects per 1000 births. The rate rose and then fell over the 16 years. The initial lower rate may have been due to underascertainment, but the recent dramatic fall is statistically sig...

let $pi_e(g)$ be the set of element orders of a finite group $g$‎. ‎let $nse(g)={m_nmid ninpi_e(g)}$‎, ‎where $m_n$ be the number of elements of order $n$ in $g$‎. ‎in this paper‎, ‎we prove that if $nse(g)=nse(l_2(81))$‎, ‎then $gcong l_2(81)$‎.