The majority of cases of spontaneous intracranial hypotension (SIH) result from spontaneous cerebrospinal fluid (CSF) leaks. The disorder has a broad clinical and imaging spectrum, with substantial variability in clinical and imaging features, in CSF findings, and in response to treatment. Headache is the most common symptom, and is typically orthostatic, but with chronicity the orthostatic fea...

Complete statistical randomization of the direction of propagation of light trapped in semiconductor films can result in a large absorption enhancement. We have employed a calorimetric technique, photothermal deflection spectroscopy, to monitor the absorption of alpha-SiH(x) films textured by the natural lithography process. The observed enhancement factors, as high as 11.5, are consistent with...

The influence of the addition of carbon on the crystalline structure and resistivity of polycrystalline silicon layers grown by simultaneous decomposition of SiH,, C^H. a n d P H T a t '°"° c w a s studied. Carbon content, morphology, preferred orientation, crystallite size, lattice strains and resistivity were determined. It was found that carbon has a pronounced effect on the crystalline stru...

The initial growth kinetics for SiH, chemical vapor deposition of Si on SiO, at low temperature (500-600 “C) have been revealed using rapid thermal UHV-CVD, together with in situ H2 thermal desorption spectroscopy to titrate the amount of exposed Si surface. In the few mTorr pressure range, the reaction is heterogeneous, i.e., dominated by surface reaction. Below -0.7 monolayer Si coverage, the...

objectives upon completion of this presentation, participants will be able to: 1) recognize mri appearance of the spontaneous intracranial hypotension and idiopathic intracranial hypertension (pseudotumor cerebri). 2) review their various clinical and imaging presentations. conclusions in this presentation we will review imaging presentations of our several proved cases. as mentioned, there are...

Abstract Nowadays, cold plasma techniques like dielectric barrier discharge (DBD) plasmas have attracted considerable interest in view of high deoxidation efficiencies as well relative simplicity setups. Although DBD copper has been mainly studied Ar/H 2 mixtures, there is no information on reduction performance such methods other protective atmospheres. In this study, the natively oxidized sur...

Atomic force calculations within the variational and diffusion quantum Monte Carlo methods are described. The advantages of calculating diffusion quantum Monte Carlo forces with the 'pure' rather than the 'mixed' probability distribution are discussed. An accurate and practical method for calculating forces using the pure distribution is presented and tested for the SiH molecule. The statistics...

Patients with intracranial hypotension may present with the classic postural headache and a broad spectrum of symptoms including nausea, vomiting, neck pain, visual and hearing disturbances, and vertigo. These various clinical presentations may lead to misdiagnosis of intracranial hypotension, thus delaying effective treatment. SIH is characterized by headache worse on standing , relieved on ly...

Growth of rough polycrystalline silicon films has been achieved on SiO, surfaces over a broad temperature range () 100 “C!) using SiH, chemical vapor deposition at low pressures (mTorr range), with smaller grain structure and roughness length scale achieved at lower temperatures. Rough morphology over a broad temperature range is attributed to the combination of nucleation-controlled initial gr...