A novel strategy is proposed for the topologically controlled synthesis of extended graphenic sheets by additively reacting carbon into a pre-existing graphene sheet which is on top of a templating substrate. This concept is implemented and demonstrated using chemical vapor deposition (CVD). Novel morphological features observed in this study suggest unusual aspects of the CVD growth process. C...

Small-angle X-ray scattering (SAXS) was performed on single-crystal chemical vapor deposition (CVD) diamonds with low nitrogen concentrations, which were fabricated by microwave plasma-assisted chemical vapor deposition at high growth rates. High optical quality undoped 500 µm-thick single-crystal CVD diamonds grown without intentional nitrogen addition proved to be excellent as windows on SAXS...

The status of transparent SiC for short wave (3–5 μm) windows and domes is reviewed. Transparent β-SiC was fabricated by the pyrolysis of methyltrichlorosilane in the presence of excess H2 and argon in a hot wall, chemical vapor deposition reactor. Characterization of the material indicates that the transparent SiC is a theoretically dense, void free, highly pure (99.9996%) cubic material posse...

7

LPCVD is a process used in the manufacturing of the deposition of thin films on semiconductors usually ranging from a few nanometers to many micrometers. LPCVD is used to deposit a wide range of possible film compositions with good conformal step coverage. These films include a variety of materials including polysilicon for gate contacts, thick oxides used for isolation, doped oxides for global...

The effect of temperature variation on the growth of Carbon Nanotubes (CNTs) using Thermal Chemical Vapor Deposition (TCVD) is presented. Nickel and Cobalt (Ni-Co) thin films on Silicon (Si) substrates were used as catalysts in TCVD technique. Acetylene gas was used in CNTs growth process at the controlled temperature ranges from 850-1000 ̊ C. Catalysts and CNTs characterization was carried out ...

background: although physical activity (pa) has long been associated with cardiovascular disease (cvd), assessment of pa status has never been used as a part of cvd risk prediction tools. the aim of the present work was to examine whether the inclusion of pa status in a cvd risk model improves its predictive accuracy. methods: data from the 10‑year follow‑up (2002–2012) of the n = 2020 particip...

This report presents a simplified surface reaction mechanism for the Chemical Vapor Deposition (CVD) of diamond thin films. The mechanism also accounts for formation of point defects in the diamond lattice, an alternate, undesirable reaction pathway. Both methyl radicals and atomic carbon are considered as growth precursors. While not rigorous in all its mechanistic details, the mechanism is us...

The concept that early growth has long-term biological effects is based on extensive studies in animals dating from the 1930s. More recently, compelling evidence for a long-term influence of early growth on later health has also emerged in humans. Substantial data now support the hypothesis that 'accelerated', or too fast infant growth, increases the propensity to obesity, glucose intolerance, ...

Editors’ Note: Commenting on “A puzzling case of amnesia” by Bereznyakova et al., Harriott and Tatum entertain an alternate diagnosis. Senior author Laforce responds. Stagnaro suggests that results in “Growth hormone treatment for childhood short stature and risk of stroke in early adulthood” should have been more specific in detailing that cardiovascular disease (CVD) was observed only in thos...