PURPOSE To evaluate and compare the spin lock and magnetization transfer techniques in the differentiation of benign and malignant head and neck tumors at magnetic resonance (MR) imaging. MATERIALS AND METHODS Forty consecutive patients with histologically verified head and neck tumors (20 malignant and 20 benign tumors, including five infections) were studied with a 0.1-T MR unit. The spin l...

in this research was designed a differential lock control system. the system was test and evaluated after fabrication and its accuracy and precision was determined. a field experiment with three replications was conducted to investigate the effect of gear ratio, the method of tractor movement during plowing and differential position on drive wheel slippage and fuel consumption of mf399 tractor ...

ing locking in terms of fast and slow methods of lock acquisition, where the slow method requires communication between threads on wait queues, is similar to the approach described by Agesen [1]. The list built by the unlocking processor is called the HANDOFF-list and the process of signalling each processor in turn is called the HANDOFF-protocol. Each processor woken during the HANDOFF-protoco...

Commercial workloads such as databases and web servers are the dominant applications running on shared-memory multiprocessors. These multithreaded programs use synchronization mechanisms (often locks) to ensure serialized access of shared data, leading to a potential performance bottleneck. Speculative Lock Elision (SLE) [2] technique has demonstrated that hardware optimization can remove many ...

Locking of central venous catheters with heparin is an accepted practice to maintain catheter patency between dialysis sessions. However, this practice may cause other adverse reactions. Although many studies suggest benefits of other catheter lock solutions over heparin on these grounds, no consensus has been reached for clinical practice. A systematic review and meta-analysis was performed of...

We investigate the in-line and cross-flow vortex-induced vibrations of a long cylindrical tensioned beam, with length to diameter ratio L/D=200, placed within a linearly sheared oncoming flow, using three-dimensional direct numerical simulation. The study is conducted at three Reynolds numbers, from 110 to 1100 based on maximum velocity, so as to include the transition to turbulence in the wake...

Frequency synthesizers are used in a large number of time division multiplexed (TDMA) and frequency hopping wireless applications where quickly attaining frequency lock is critical. A new frequency synthesizer is described which employs a scheme for reducing lock time by a factor of two using a conventional phase locked loop architecture. Faster lock is attained by shifting the loop filter’s ze...