The biphenyl-bridged. chiral zirconocene complex rac-2.2' -biphenyl-bis( 3.4-dimethylcyclopentadienyl I zirconium dichloride catalyzes the reaction of 1.6and 1,7 -dienes with excess dibutyl magnesium to bis( butyl-magnesio-methyl '-substituted cycloalkanederivatives. Analogous reactions occur with butyl magnesium chloride and with heteroatom-t.:Ontaining dienes. The preference of 1.6-dienes for...

Public transit systems are a critical component of major metropolitan areas. However, in the face of increasing demand, most of these systems are operating close to capacity. Under normal operating conditions, station crowding and boarding denial are becoming a major concern for transit agencies. As such, any disruption in service will have even more severe consequences, affecting huge number o...

Transit users’ travel satisfaction is important for assessing the performance of transit-oriented development. Existing studies emphasize role service attributes, built environment, and attitudes in predicting transit satisfaction. However, few have jointly examined effects environment based on sophisticated theoretical foundations. This paper aims to narrow this gap by examining interaction ac...

Introduction: The dwell time and transit time components contribute to the overall delivered dose to patients in high dose rate (HDR) brachytherapy treatments. The transit time results from source entry and exit as well as source movements between dwell positions. It depends on various parameters such as the source speed profile, source indexer distance to dwell position, and ...

15. Supplementary Notes Supported by general revenues from the State of Texas. 16. Abstract Since transportation infrastructure projects have a lifetime of many decades, project developers must consider not only the current demand for the project but also the future demand. Future demand is of course uncertain and should be treated as such during project design. Previous research for Southwest ...

a response to the problem of irans backwardness preoccupied the minds of intellectual and political forces. since irans failure from russia while different domestic and external factors caused to defeat, differend and even contending views concerning irans backwardness played a key role in these failures. these diverse and contending views which arised at first in compilation of laws and establ...

Considering operators of the urban rail transit systems are often faced with cost control, passengers required high service quality, which has inter-affection between each other in congestion issues for peak period. A good cooperative timetable associated time-based shift radios is proposed to achieve a mutually beneficial win-win situation low energy consumption (costs), and short waiting time...

colon transit time study with radio opaque markers is a simple method for assessment of colon motility disorder in patients with chronic idiopathic constipation. appendicitis caused by metallic objects has been reported repeatedly and is very important because of its complications. we report a case of acute appendicitis that was induced by impaction of radio opaque markers after colon transit t...