{1,3-Bis[(diphenyl­phosphanyl-κP)­oxy]propane}dicarbonyl­iron(0)

The structure of the title compound, [Fe(C27H26O2P2)(CO)2], exhibits a distorted tetra­hedral coordination [bond angle range = 96.31 (12)–119.37 (4)°], comprising two P-atom donors from the chelating 1,3-bis­[(diphenyl­phosphan­yl)­oxy]propane ligand [Fe—P = 2.1414 (10) and 2.1462 (10) Å] and two carbonyl ligands [Fe—C = 1.763 (4) and 1.765 (3) Å]

{1,3-Bis[(diphenyl­phosphanyl-κP)­oxy]prop-2-yl-κC 2}iodido(trimethyl­phosphane)cobalt(II)

The title compound, [Co(C27H25O2P2)I(C3H9P)], was synthesized by the addition of 1-iodo­butane to a solution of the parent cobalt complex {1,3-bis­[(diphenyl­phosphan­yl)­oxy]prop-2-yl}bis­(trimethyl­phosphane)cobalt(II). Two five-membered cobaltocycles with considerable ring bending (sum of inter­nal angles = 516.4 and 517.7°) are formed through two P atoms of the PPh2 groups and a metallated Csp 3 atom. The CoII atom is centered in a trigonal-bipyramidal configuration

Time-triggered State-machine Reliable Software Architecture for Micro Turbine Engine Control

AbstractTime-triggered (TT) embedded software pattern is well accepted in aerospace industry for its high reliability. Finite-state-machine (FSM) design method is widely used for its high efficiency and predictable behavior. In this paper, the time-triggered and state-machine combination software architecture is implemented for a 25 kg thrust micro turbine engine (MTE) used for unmanned aerial vehicle (UAV) system; also model-based-design development workflow for airworthiness software directive DO-178B is utilized. Experimental results show that time-triggered state-machine software architecture and development method could shorten the system development time, reduce the system test cost and make the turbine engine easily comply with the airworthiness rules

Reconstruction of cytosolic fumaric acid biosynthetic pathways in Saccharomyces cerevisiae

<p>Abstract</p> <p>Background</p> <p>Fumaric acid is a commercially important component of foodstuffs, pharmaceuticals and industrial materials, yet the current methods of production are unsustainable and ecologically destructive.</p> <p>Results</p> <p>In this study, the fumarate biosynthetic pathway involving reductive reactions of the tricarboxylic acid cycle was exogenously introduced in <it>S. cerevisiae </it>by a series of simple genetic modifications. First, the <it>Rhizopus oryzae </it>genes for malate dehydrogenase (<it>RoMDH</it>) and fumarase (<it>RoFUM1</it>) were heterologously expressed. Then, expression of the endogenous pyruvate carboxylase (<it>PYC2</it>) was up-regulated. The resultant yeast strain, FMME-001 ↑<it>PYC2 </it>+ ↑<it>RoMDH</it>, was capable of producing significantly higher yields of fumarate in the glucose medium (3.18 ± 0.15 g liter^-1) than the control strain FMME-001 empty vector.</p> <p>Conclusions</p> <p>The results presented here provide a novel strategy for fumarate biosynthesis, which represents an important advancement in producing high yields of fumarate in a sustainable and ecologically-friendly manner.</p

Sensitivity Analysis and Optimization of a Coal-fired Power Plant in Different Modes of Flue Gas Recirculation

AbstractIn a coal-fired power plant with flue gas recirculation, recirculation rate and coal input have a great effect on the performance of the power plant. In this paper, a 600 MW coal-fired boiler is taken as base case, the main parameters of the boiler are calculated at different recirculation rates and coal input conditions, an optimization is carried out and the optimum recirculation rate and coal input are reported. The results show that under optimum recirculation rate and coal input conditions, the net coal consumption rate can be reduced by 3.5g/(kW·h) at 575MW load; while it is 4.36g/(kW·h) and 5.11g/(kW·h), respectively, at 450MW load and 300MW load. Compared to the conventional flue gas recirculation system, the net coal consumption rate can be reduced by 2.31 g/(kW·h), 2.42 g/(kW·h) and 2.41 g/(kW·h), respectively, at 575MW, 450MW and 300MW load

Utilization of LNG Cryogenic Energy in a Proposed Method for Inlet Air Cooling to Improve the Performance of a Combined Cycle

AbstractIn this study a cold production process was proposed for inlet air cooling in which cryogenic energy from liquefied natural gas (LNG) was sufficiently converted to cold energy. The effect of using the cold production process for inlet air cooling on the off-design performance of a gas turbine combined cycle was analyzed under different ambient conditions. The cold output of the proposed process was increased by about 38.1% to 42.5% compared to that of the conventional cold production process that involves direct LNG evaporation. Furthermore for the inlet air cooling, the proposed method increased the relative power increment from 2.2% to 14.4% and the relative efficiency increment from 0.7% to 2.2%, mainly depending on the variations in the relative humidity, compared to cold production without air cooling. The relative power and relative efficiency of the proposed air cooling were increased by 0.6% to 3.1% and 0.3% to 0.5%, respectively, above those of the traditional air cooling