The constriction resistance of a semi-infinite cylinder terminating in the frustum of a cone in a gaseous environment is analyzed numerically. The variation of constriction resistance with the ratio of contact radius to cylinder radius, the cone angle, and the gas-to-substrate thermal conductivity ratio is investigated. Nonlinear curve fitting is used to develop a comprehensive predictive corre...

a distinctive and general feature of gas-phase aromatic substitution, occurs only in those cases where the electrophile fulfils certain requirements. Paramount among the latter seem to be the presence of H atoms carrying a substantial fraction of the positive charge, capable of establishing localized H bonds with the unshared electrons of the substituent, as well as a suitable geometry of the c...

Abstract In this study, the effect of Al on high temperature oxidation Al-containing refractory entropy alloys (RHEAs) Ta-Mo-Cr-Ti-xAl ( x = 5; 10; 15; 20 at%) was examined. Oxidation experiments were performed in air for 24 h at 1200 °C. The kinetics alloy with 5 at% is notably affected by formation gaseous MoO 3 and CrO , while continuous mass gain detected higher concentrations. 15 form rela...

Plasma-assisted thermal chemical vapor deposition (CVD) was carried out to synthesize high-quality graphene film at a low temperature of 600°C. Monolayer graphene films were thus synthesized on Cu foil using various ratios of hydrogen and methane in a gaseous mixture. The in situ plasma emission spectrum was measured to elucidate the mechanism of graphene growth in a plasma-assisted thermal CVD...

The Marangoni contraction of sessile drops of a binary mixture of a volatile and a nonvolatile liquid has been investigated experimentally and theoretically. The origin of the contraction is the locally inhomogeneous evaporation rate of sessile drops. This leads to surface tension gradients and thus to a Marangoni flow. Simulations show that the interplay of Marangoni flow, capillary flow, diff...

The previous chapters present various specific facets of soilless plant production, representing the state of the art and include some perspectives on the direction in which the field is moving. In some cases, gaps in knowledge were pointed out and required future research was suggested. Generally the chapters focus on particular facets of a system whose full complexity was beyond the scope of ...

Nitric oxide (NO) is a gaseous regulatory factor produced by NO synthases (NOS) and it plays several critical roles via S-nitrosylation of protein cysteine residues. Histone deacetylase (HDAC) functions in the maintenance/balance of chromatin acetylation and contributes to transcriptional supression. It has been reported that S-nitrosylation of HDAC2 is involved in the regulation of deacetylase...

Microtribological measurements of a hydrogenated diamondlike carbon film in controlled gaseous environments show that water vapor plays a significant role in the friction coefficient. These experiments reveal an initial high friction transient behavior that does not reoccur even after extended periods of exposure to low partial pressures of H2O and O2. Experiments varying both water vapor press...

* Corresponding author. Abstract – The Worldview-2 satellite imagery with 2-m spatial resolution and 8 spectral bands is used to map the coastal ecosystems for our study site, an offshore island of Singapore. The eastern side of the study area is used as a landfill, while the western part of the island is left natural with rich biodiversity where large stretches of seagrass meadow, mangroves an...

Batch culture of Ralstonia eutropha using the recycled gas closed circuit culture system was conducted in order to develop a practical fermentation system for industrial autotrophic culture for poly (hydroxybutrate) production. The gas phase of the culture system consisted of substrate gas so that gases in this culture could be recycled as long as the amount of the gas consumed would be repleni...