This stroke experiment was designed to define the mismatch between perfusion-weighted imaging (PWI) and diffusion-weighted imaging (DWI) in MRI by applying early or instantly acquired PWI. Eight rats were induced with stroke through photothrombotic occlusion of the middle cerebral artery and scanned serially between 1 h and day 3 after induction using DWI and PWI with a 1.5 T MR scanner. The re...

BACKGROUND Diffusion weighted MR imaging (DWI) plays an important role in the diagnosis of perinatal arterial ischemic stroke (PAIS) during the acute phase. Its derived apparent diffusion coefficient (ADC) can be used to quantify the diffusion restriction. Aim of the current study was to identify the changes in ADC values in the acute phase following PAIS. METHODS A cohort of 36 infants with ...

The air-suction roller dibbler for peanuts is the core component to realizing precision seeding on film; however, seeds in cannot accurately fall into seed-guiding mechanism during work. In this study, we stabilized seed trajectory by adjusting installation angles of chock block (IACB) and cover (IADC). We studied seed-movement characteristics under different IACB covers using EDEM simulation s...

38 ■ For The Defense ■ May 2014 ■ John T. Harding is a partner in the Boston office of Morrison Mahoney LLP, where he practices in the firm’s Complex Insurance and Reinsurance Group. Mr. Harding has represented insurers in a variety of high-stakes coverage and reinsurance litigation for more than 25 years. He is active in DRI’s Insurance Law Committee and has been a frequent speaker at DRI insu...

This paper introduces a method for selecting the best sensor layout when using wired pipe for drilling operations. The introduction of wired pipe in drilling operations increases the data rate significantly compared to standard telemetry systems. Various sensors systems are available, measuring parameters such as drillstring vibration, drillstring torque, downhole fluid temperature and downhole...

The point algebra is a fundamental formal calculus for spatial and temporal reasoning. We present a new generalization that meets all requirements to describe dependencies on networks. Applications range from traffic networks to medical diagnostics. We investigate satisfaction problems, tractable subclassses, embeddings into other relation algebras, and the associated interval algebra. 1 The De...

Communicated by S. S. Cherm, October 31, 1966 1. The solution of the principal field problem on arbitrary Riemannian spaces is given in reference 2. In the present note we consider the class S of harmonic semifields, intermediate between the class F of harmonic fields and the class H of harmonic forms. The definitions are as follows. On a given Riemannian space V let A' = 6d, A` = d6, A = A' + ...