Structure of an eight-membered CN4S3 ring with a Ph3P=N substituent

Sherpa Romeo green journal7-Phenyl-3-(triphenylphosphinimino)- 1,3,5,- 2,4,6,8-trithiatetrazocine, C25H20N5PS3, Mr = 517.64, monoclinic, P21/c, a = 13.957 (3), b = 9.242 (3), c = 19.473 (4)/k, fl= 102.80 (2) °, V= 2449.4 A 3, Z =4, Dx=l.4Ogcm -3, 2(MoKc0=0.71069A, ~= 3.8cm -1, F(000)=1072, T=293(1) K, final R= 0.038 for 2430 observed reflections. The molecule has a phenyl ring substituted at a planar carbon, and a PhaP=N group substituted at S in the 3-position. The CN4S3 ring is folded by 114.5 °, with an almost planar SNCNS fragment, and an endo-S-envelope SNSNS fragment (dihedral 145.0°). The PhaP=N substituent at S is endo and the transannular S...S contact is 2.415 (1)A.Ye

Life cycle assessment and feasibility study of small wind power in Thailand

The Thai government’s implementation of its 10 year renewable energy plan was done to help increase energy independence and reduce emissions resulting from energy production. Due to Thailand’s wind regime, wind turbines which can operate in low wind speeds will be needed to meet this goal. Small wind turbines typically operate at higher efficiency in lower winds, and thus they might prove to be a good option for wind power production in Thailand. Incorporating small wind turbines into power production can be difficult because of the perception of high investment costs and because their net benefit has not been adequately studied. Using a functional unit of producing 50 kWh per month for 10 years we conducted a Life Cycle Assessment comparing the global warming potential (GWP), embodied energy (EE), and levelized cost of electricity (LCOE) of four small wind turbines (≤20 kW), a diesel generator, and the Thai Grid. When analyzing GWP of the turbines it was found that they had a lower overall GWP than the diesel generator when in areas with reasonable wind resources. The same is true for embodied energy. Interestingly, in most available wind speed categories in Thailand the LCOE for wind turbines was lower than for the diesel generator. However, neither could compare to the LCOE of the Thai Grid, except in the areas with the highest average wind speeds (7.0 -­‐9.4 m/s). With this in mind, it is clear that the most important factor when considering wind power generation is the wind regime available in an area. Because of the increased cost relative to the Thai grid, implementation of wind turbines in Thailand was not found to be economically viable. This could be changed given lower costs for turbines and/or government incentives

Structure of an eight-membered CN4S3 ring with the shortest known transannual s...s contact

Sherpa Romeo green journal7-tert-Butyl-3-chloro- 1,3,5,2,4,6,8-trithiatetrazocine, CsH9C1N4S 3, Mr= 256"8, tetragonal, P42/n, a = 17.856 (2), c = 6.646 (1) A, V = 2118.9 (8)/k 3, z=8, Dx= 1.61gcm -3, 2(MoKa)=0.71073A, # =8.9cm -1, F(000)=1056, T=294K, final R= 0.049 for 1201 reflections. The molecule has a folded butterfly structure, with almost planar SNCNS and SNSNS fragments, and the C1 atom is endo. The transannular S-S contact is 2.378 (2)A, the shortest such distance in any thiazyl compound.Ye

First principles predictions of thermophysical properties of refrigerant mixtures

We present pair potentials for fluorinated methanes and their dimers with CO2 based on ab initio potential energy surfaces. These potentials reproduce the experimental second virial coefficients of the pure fluorinated methanes and their mixtures with CO2 without adjustment. Ab initio calculations on trimers are used to model the effects of nonadditive dispersion and induction. Simulations using these potentials reproduce the experimental phase-coexistence properties of CH3F within 10% over a wide range of temperatures. The phase coexistence curve of the mixture of CH2F2 and CO2 is reproduced with an error in the mole fractions of both phases of less than 0.1. The potentials described here are based entirely on ab initio calculations, with no empirical fits to improve the agreement with experiment

Structure of a bicyclic sulfur-nitrogen-carbon heterocyclic molecule

Sherpa Romeo green journal7-Phenyl- 124324b'2,524-trithia-2,4,6,8,9-penta - azabicyclo[3.3.1]nonane, CTHsNsS 3, M r = 255.3, monoclinic, P2Jn, a = 5.958 (1), b = 22.954 (2), c= 7.428 (1) A,/I= 106.25 (1) °, V= 975.2 (4) A 3, Z=4, D x = 1.74 g cm -3, 2(Mo K~) = 0.71073 A, /~ = 7.00 cm -l, F(000) = 520, T = 293 K, R = 0.030 for 1363 unique observed reflections. The planar SNCNS and SNSNS components of the bicyclic molecule make dihedral angles of 137.1 and 118.3 ° with the SNS bridging unit. The S-N bonds connecting the NSN fragment to the CN3S 2 ring are much longer (1.728 A) than those in the remainder of the molecule (1.546- 1.630 A).Ye

High-pressure dc magnetic measurements on a bisdiselenazolyl radical ferromagnet using a vibrating-coil SQUID magnetometer

The high-pressure magnetic properties of the iodo-substituted bisdiselenazolyl radical ferromagnet IBPSSEt have been studied by vibrating-coil SQUID magnetometry. The magnetic state at a pressure (P) of approximately 2 GPa has the highest Curie temperature (TC) of 27.5 K, and displays an ideal three-dimensional (3D) ferromagnetic interaction network. The value of TC observed by ac magnetic susceptibility measurements is consistent with that obtained from dc measurements below approximately 4 GPa. Field-cooled dc measurements at more elevated pressures reveal a slow evolution of magnetic ordering, so that atP >6 GPa the structure may be described in terms of a 1D ferromagnetic chain with predominantly antiferromagnetic lateral (interchain) interactions, in accord with the results of density functional theory calculations

Structure of 1,3-dichloro-5-phenyl-1λ4,3λ4,2,4,6-dithiatriazine

Sherpa Romeo green journalC7HsC12N3S2, Mr=266.17, triclinic, P], a=6-028(1), b=9-985(2), c=10.157 (3) /~, ct= 117.33 (2), fl= 106.73(2), y=90.31(1) °, V= 513-3(4)/~3, Z=2, D x=1.72gcm -3, 2(MoK~t)= 0.71073 A, /1 = 9.85 cm -1, F(000) = 268, T= 293 K, R = 0.032 for 1547 unique observed reflections. The SNCNS portion of the ring is planar within 0-060 (2)/~ and the third N is displaced 0.336 (2) A from this plane on the side opposite the S-bonded C1 atoms. The S-N distances range from 1.581 (1) to 1.615 (2)/~ and the N-C distances are 1.327 (2) and 1.344 (2) ./k.Ye

The structure of the norbornadiene adduct of 5-phenyl-1,3,2,4,6-dithiatriazine

Sherpa Romeo green journal10-Phenyl- 1,8-dithia-9,11,12-triazatetracyclo- [6.3.1.1 a,6.02,7]tfideca- 1 (11),4,9,8 (12)-tetraene, C ~4- H13N3S2, Mr-- 287.4, monoclinic, P2 l, a = 5-789 (2), b=10.064(1), c--11.109(2)A, fl=94.78(2) °, V = 644.9 (4)/~3, Z = 2, D x = 1.48 g cm -3, 2(Mo Kct) =0.71073/~, p-- 3.84cm -~, F(000)= 300, T-- 293 K, R -- 0.037 for 1203 unique observed reflections. The norbornadiene bonds to the sulfur atoms in the exo-fl orientation and the nitrogen atom between the sulfur atoms is displaced 0.802 (4)/~ from the SNCNS plane. The C-N bond lengths are equal [1.335 (5)A] and the S--N bond lengths in a very narrow range of values [1.637 (4)-1.652 (4) A].Ye

Soil methane sink capacity response to a long-term wildfire chronosequence in Northern Sweden

Boreal forests occupy nearly one fifth of the terrestrial land surface and are recognised as globally important regulators of carbon (C) cycling and greenhouse gas emissions. Carbon sequestration processes in these forests include assimilation of CO2 into biomass and subsequently into soil organic matter, and soil microbial oxidation of methane (CH4). In this study we explored how ecosystem retrogression, which drives vegetation change, regulates the important process of soil CH4 oxidation in boreal forests. We measured soil CH4 oxidation processes on a group of 30 forested islands in northern Sweden differing greatly in fire history, and collectively representing a retrogressive chronosequence, spanning 5000 years. Across these islands the build-up of soil organic matter was observed to increase with time since fire disturbance, with a significant correlation between greater humus depth and increased net soil CH4 oxidation rates. We suggest that this increase in net CH4 oxidation rates, in the absence of disturbance, results as deeper humus stores accumulate and provide niches for methanotrophs to thrive. By using this gradient we have discovered important regulatory controls on the stability of soil CH4 oxidation processes that could not have not been explored through shorter-term experiments. Our findings indicate that in the absence of human interventions such as fire suppression, and with increased wildfire frequency, the globally important boreal CH4 sink could be diminished

A rigid barrier between the heart and sternum protects the heart and lungs against rupture during negative pressure wound therapy

<p>Abstract</p> <p>Objectives</p> <p>Right ventricular heart rupture is a devastating complication associated with negative pressure wound therapy (NPWT) in cardiac surgery. The use of a rigid barrier has been suggested to offer protection against this lethal complication, by preventing the heart from being drawn up and damaged by the sharp edges of the sternum. The aim of the present study was to investigate whether a rigid barrier protects the heart and lungs against injury during NPWT.</p> <p>Methods</p> <p>Sixteen pigs underwent median sternotomy followed by NPWT at -120 mmHg for 24 hours, in the absence (eight pigs) or presence (eight pigs) of a rigid plastic disc between the heart and the sternal edges. The macroscopic appearance of the heart and lungs was inspected after 12 and 24 hours of NPWT.</p> <p>Results</p> <p>After 24 hours of NPWT at -120 mmHg the area of epicardial petechial bleeding was 11.90 ± 1.10 cm²when no protective disc was used, and 1.15 ± 0.19 cm²when using the disc (p < 0.001). Heart rupture was observed in three of the eight animals treated with NPWT without the disc. Lung rupture was observed in two of the animals, and lung contusion and emphysema were seen in all animals treated with NPWT without the rigid disc. No injury to the heart or lungs was observed in the group of animals treated with NPWT using the rigid disc.</p> <p>Conclusion</p> <p>Inserting a rigid barrier between the heart and the sternum edges offers protection against heart rupture and lung injury during NPWT.</p