Antipollution system to remove nitrogen dioxide gas

Gas phase reaction system using anhydrous ammonia removes nitrogen dioxide. System consists of ammonia injection and mixing section, reaction section /reactor/, and scrubber section. All sections are contained in system ducting

The Golgin GMAP210/TRIP11 Anchors IFT20 to the Golgi Complex

Eukaryotic cells often use proteins localized to the ciliary membrane to monitor the extracellular environment. The mechanism by which proteins are sorted, specifically to this subdomain of the plasma membrane, is almost completely unknown. Previously, we showed that the IFT20 subunit of the intraflagellar transport particle is localized to the Golgi complex, in addition to the cilium and centrosome, and hypothesized that the Golgi pool of IFT20 plays a role in sorting proteins to the ciliary membrane. Here, we show that IFT20 is anchored to the Golgi complex by the golgin protein GMAP210/Trip11. Mice lacking GMAP210 die at birth with a pleiotropic phenotype that includes growth restriction, ventricular septal defects of the heart, omphalocele, and lung hypoplasia. Cells lacking GMAP210 have normal Golgi structure, but IFT20 is no longer localized to this organelle. GMAP210 is not absolutely required for ciliary assembly, but cilia on GMAP210 mutant cells are shorter than normal and have reduced amounts of the membrane protein polycystin-2 localized to them. This work suggests that GMAP210 and IFT20 function together at the Golgi in the sorting or transport of proteins destined for the ciliary membrane

Calculation of RDX molecular crystal geometry and vibrational frequencies under hydrostatic pressure

First-principles calculations of the effects of hydrostatic pressure on RDX are performed using the all-electron CRYSTAL06 program. The lattice constants and optimized internal coordinates are simultaneously obtained at ambient pressure and hydrostatic pressure up to 2.9 GPa. The vibrational frequencies as a function of pressure are also calculated and compared with experimental results from the literature. © 2007 American Institute of Physics

Analysis of α-phase RDX vibrational lattice modes under hydrostatic pressure

Calculations using the all-electron CRYSTAL06 program employing density functional theory are used to calculate the terahertz vibrational frequencies of α-phase RDX. The lowest frequency infrared active lattice modes are investigated as a function of hydrostatic pressure from ambient conditions up to 3 GPa. A given mode may be composed of both external and internal vibration contributions, with the composition changing as a function of pressure. The anharmonic deviation of each mode from simple harmonic behavior as a function of pressure is also explored. © 2009 American Institute of Physics

Accurate prediction of second-order elastic constants from first principles: PETN and TATB

We present preliminary results on the structural and mechanical properties of PETN and TATB as obtained by ab-initio calculations. While first principles approaches describe properties of materials occurring at 0 K, experimental results are mainly provided at ambient temperature. This difference leads to discrepancies in the desired agreement of calculated and measured properties. Also, the congenital limitation of DFT in dealing with long-range dispersion interactions, provide intrinsic limitations in this attempt. Our results are obtained through a full 3D approach that takes into account the van der Waals interaction in the form of London dispersion forces between the molecules assembled in the solid using the B3LYP-D* functional. Results are compared with available experiments and previous simulation data, showing very good agreement and validating the importance of including volume expansion effects in the description of molecular crystals at temperatures above absolute zero. To the authors\u27 knowledge, the results presented for the elastic constants of TATB are the first ab-initio data for this energetic material. © 2012 American Institute of Physics

Generation of C.W. stimulated sub-millimetre waves

Amplification of sub-millimetre radiation at 337 μ has been obtained with a D.C. discharge in the cavity of a pulsed CN maser. Using a D.C. gas discharge a CW maser has been constructed giving an output of about 50 mW

Pulse Discharge Network Development for a Heavy Gas Field Reversed Configuration Plasma Device

A simple LRC circuit model is used to conduct a parametric study of the effects of charging voltage, capacitance, resistance, and inductance on the current waveform of a pulse forming network for field reversed configuration (FRC) plasma production. Using known waveforms from existing networks, estimates of realistic values of resistance and inductance are established for a base network model. Parametric modification of the base model is used to study the effects of each component of the discharge network. Results indicate that increasing charging voltage causes an increase in peak current, but does not effect rise or reversal times. However, increasing capacitance increases peak current and increases rise and reversal times. Further, optimum circuit parameters are determined for the design and construction of an FRC formation test article. Three main design criteria are used and are based on magnetic diffusion time, auto-ionization of background gas, and peak magnetic field strength. Results indicate that a pulse forming network with charging voltage of 25 kV and capacitance of 1 μF provides the widest range of resistance and inductance values such that the waveform meets the design criteria. C