The early phase of IT diffusion plays a critical role. Takeoff involving rapid growth of an IT is an acid test for whether the technology will succeed. We develop a new theory to understand global takeoff for digital wireless phones and technologies with related characteristics. We construct a multi-theoretical model that consists of standards, market competition, technology cost, and technolog...

T authors study the takeoff of 16 new products across 31 countries (430 categories) to analyze how and why takeoff varies across products and countries. They test the effect of 12 hypothesized drivers of takeoff using a parametric hazard model. The authors find that the average time to takeoff varies substantially between developed and developing countries, between work and fun products, across...

Electronic bid documents are available from a variety of sources. Historically, contractors have printed the electronic documents and then performed their takeoffs. Takeoff viewers are now available that allow the contractor to perform their takeoffs directly from the electronic documents. Several software companies that produce takeoff viewers are listed and features of takeoff viewers are des...

Emissions inventory calculations for airports, using standard emissions inventory reporting methods, are inflated due an assumption of use of maximum takeoff thrust. To enhance the operational life of jet engines and reduce fuel burn, airlines frequently use reduced thrust (i.e. Derated or Flex Temperature thrust) for the takeoff procedure. Without access to internal airline “load sheet” paperw...

The effect of skis on the force-time characteristics of the simulated ski jumping takeoff was examined in a wind tunnel. Takeoff forces were recorded with a force plate installed under the tunnel floor. Signals from the front and rear parts of the force plate were collected separately to examine the anteroposterior balance of the jumpers during the takeoff. Two ski jumpers performed simulated t...

Takeoff and landing are critical phases in a flight. To better understand the functional importance of the kinematic adjustments birds use to execute these flight modes, we studied the wing and body movements of pigeons (Columba livia) during short-distance free-flights between two perches. The greatest accelerations were observed during the second wingbeat of takeoff. The wings were responsibl...

The etiology of patellar tendinopathy (jumper's knee) has been attributed to a significant increase in patellar tendon torques associated with jumping. While some investigators have suggested that patellar tendon torques are greater during takeoff, little is known about the relative magnitudes of patellar tendon torques during takeoff and landing. We hypothesized that peak patellar tendon torqu...

SUMMARY An analyttcal study has been made of the effect of such parameters as wing loading, aspect ratio, tbmst-we&t ratlo, and number of engmes, on the takeoff performance of fIxed Wang aircraft. Expressions are derived for the takeoff lift coefficients which give the shortest takeoff distance, the hlgbest takeaff wng loadmg, and climb condlhons Just meeting the anwwthmess requrements. Example...

Takeoff Flap Retraction is a procedure that is conducted following takeoff to retract the flaps and slats from a takeoff configuration to a clean-up-and-away configuration. During this period the aircraft accelerates from the takeoff V2 speed to 250 knots and generally includes a maximum thrust reduction from the takeoff thrust setting to the climb thrust setting. Timing of the flap retraction ...