Boron nitride ~BN! thin films ~containing mixed cBN/hBN phase! have been deposited on Si~100! substrates using neutralized nitrogen beam and electron beam evaporation of boron. All as-deposited BN films were p type with a room-temperature carrier concentration in the range of 5310 to 1310 cm. The Mg-doped BN films showed carrier concentrations in the range of 1.2 310 cm to 5.2310 cm when the Mg...

Introduction: Accurate assessment of aggressiveness of localized prostate cancer (PCa) is essential, because not all PCa is life-threatening and overtreatment of indolent disease should be prevented. The different functional magnetic resonance (MR) techniques, diffusion weighted imaging (DWI) [1,2], MR spectroscopic imaging (MRSI) [3] and dynamic contrast-enhanced (DCE)-MRI [4], show potential ...

The in vivo neuronal contribution to human cerebral metabolic rate of glucose (CMRglc), measured by 18FDG-PET, is unknown. Examining the effect of 1H MRSI-derived N-acetyl aspartate (NAA) concentration on positron emission tomography (PET) measures of metabolic activity might indicate the relationship of CMRglc to neuron density. In a population of 19 demented, cognitively impaired, and control...

There is no set protocol for imaging prostate cancer, and a selection of a particular modality (TRUS, CT or MRI) often depends on the equipment and local expertise available. None of the imaging modality is perfect and a judicious combination provides the best results. MR imaging and MR spectroscopic imaging are powerful new tools for the local anatomic and metabolic evaluation of prostate canc...

Abstract In order to improve the firing density and damage efficiency of electromagnetic gun, control algorithm multiple rounds simultaneous impact(MRSI) gun was established by controlling initial velocity projectile time interval launch. Under premise that can effectively strike efficiency, allowable distance error flight are set, fourth-order Runge Kutta method is used calculate outer ballist...

results when the two ms groups were compared together, we found that cr was significantly increased (p value=0.008) and naa/cr was significantly decreased (p value=0.03) in non-enhancing lesions in ppms compared with rrms. there was no significant difference in naa, cho or naa/cho between the two ms subtypes. conclusion mrs is a potential way to differentiate ppms and rrms. objectives we compar...

Introduction Hypoxia is one of the hallmarks of tumors, and triggers multiple signaling cascades that significantly impact upon biological outcomes including selection for resistance to apoptosis, resistance to radiation and chemotherapy, and increased tumor aggressiveness [1]. These hypoxic regions that arise from inadequate blood supply of tumors have a heterogeneous spatial distribution [1]....

Magnetic resonance spectroscopy and diffusion magnetic resonance imaging (MRI) characteristics of human intracranial glioma were studied. Present knowledge suggests a hypothetical inverse relationship between the characteristic choline signal intensity elevation and the apparent diffusion coefficient (ADC) in glioma. Twenty cases of glioma were examined with diffusion-weighted echoplanar imagin...