Geometric and Electronic Structures of Nickel(II) Complexes of Redox Noninnocent Tetradentate Phenylenediamine Ligands

International audienc

Mn( iv ) and Mn( v )-radical species supported by the redox non-innocent bis(2-amino-3,5-di-tert-butylphenyl)amine pincer ligand

International audienc

Toward a new generation of white phosphors for solid state lighting using glassy yttrium aluminoborates

International audienc

La question biographique en littérature

The Larson Studio Collection contains portraits and landscape photographs from Thomas Larson and his son O. Blaine Larson, who operated the Larson Studio in Provo, Utah County, Utah

Air-Sea Turbulent Fluxes From a Wave-Following Platform During Six Experiments at Sea

Turbulent fluxes at the air‐sea interface are estimated with data collected in 2011 to 2017 with a low‐profile platform during six experiments in four regions. The observations were carried out with moderate winds (2–10 m/s) and averaged wave heights of 1.5 m. Most of the time, there was a swell, with an averaged wave age (the ratio between wave phase speed and wind speed) being equal to 2.8 ± 1.6. Three flux calculation methods are used, namely, the eddy covariance (EC), the inertial dissipation (ID), and the bulk methods. For the EC method, a spectral technique is proposed to correct wind data from platform motion. A mean bias affecting the friction velocity (u*) is then evaluated. The comparison between EC u* and ID u* estimates suggests that a constant imbalance term (ϕimb) equal to 0.4 is required in the ID method, possibly due to wave influence on our data. Overall, the confidence in the calculated u* estimates is found to be on the order of 10%. The values of the drag coefficient (CD) are in good agreement with the parameterizations of Smith (1988, https://doi.org/10.1029/JC093iC12p15467) in medium‐range winds and of Edson et al. (2013, https://doi.org/10.1175/JPO‐D‐12‐0173.1) in light winds. According to our data, the inverse wave age varies linearly with wind speed, as in Edson et al. (2013, https://doi.org/10.1175/JPO‐D‐12‐0173.1), but our estimates of the Charnock coefficient do not increase with wind speed, which is possibly related to sampling swell‐dominated seas. We find that the Stanton number is independent from wind speed

OCARINA (Ocean coupled to the atmosphere: instrumented research on an auxiliary ship)

The OCARINA platform (Ocean Coupled to the Atmosphere, Research on the Interface on the Annex Ship) is a surface naval drone specifically developed to measure turbulent and radiative exchanges at the ocean/atmosphere interface.Designed and produced at LATMOS in 2009, the initial version of OCARINA has evolved through campaigns and collaborations with DT-INSU, Ifremer, LOCEAN, and IRPHE.The onboard instruments are an inertial unit, a GPS, a sonic anemometer, a probe for measuring rising and falling radiative flows in the infrared and in visible wavelengths, a submerged probe of the CT type, and a meteorological station.Remote-controlled trimaran Ocarina (Océan couplé à l'atmosphère : recherche instrumentée sur navire annexe / Ocean coupled to the atmosphere: instrumented research on an auxiliary ship).The OCARINA platform (Ocean Coupled to the Atmosphere, Research on the Interface on the Annex Ship) is a surface naval drone specifically developed to measure turbulent and radiative exchanges at the ocean/atmosphere interface.Designed and produced at LATMOS in 2009, the initial version of OCARINA has evolved through campaigns and collaborations with DT-INSU, Ifremer, LOCEAN, and IRPHE.The onboard instruments are an inertial unit, a GPS, a sonic anemometer, a probe for measuring rising and falling radiative flows in the infrared and in visible wavelengths, a submerged probe of the CT type, and a meteorological station.The level 2 data provided are:the location, speed, heading and route followedthe height and significant period of waves longer than two metersthe water temperature (SST) at a depth of 30 cmsurface salinity (SSS)the meteorological variables (wind in modulus and direction, temperature, humidity and pressure) at one meter high.solar and infrared fluxes up and downturbulent bulk flows (u*, Hs and LE), and Monin-Obukhov's ratio (z/L)u* and Hsv (the turbulent buoyancy flux) estimated by the inertio dissipative methodu* and Hsv estimated by covariance metho

Carl von Linné fil. to Peter Simon Pallas

Square planar cobalt­(II) complexes of salen ligands <i>N</i>,<i>N</i>′-bis­(3-<i>tert</i>-butyl-5<i>R</i>-salicylidene)-1,2-cyclohexanediamine), where R = OMe (<b>1</b>) and <i>tert</i>-butyl (<b>2</b>), were prepared. <b>1</b> and <b>2</b> were electrochemically reversibly oxidized into cations <b>[1-H</b>_<b>2</b><b>O]</b>^<b>+</b> and <b>[2-H</b>_<b>2</b><b>O]</b>^<b>+</b> in CH₂Cl₂. The chemically generated <b>[1-H</b>_<b>2</b><b>O]­(SbF</b>_<b>6</b><b>)·0.68 H</b>_<b>2</b><b>O·0.82CH</b>_<b>2</b><b>Cl</b>_<b>2</b> and <b>[2-H</b>_<b>2</b><b>O]­(SbF</b>_<b>6</b><b>)·0.3H</b>_<b>2</b><b>O·0.85CH</b>_<b>2</b><b>Cl</b>_<b>2</b> were characterized by X-ray diffraction and NIR spectroscopy. Both complexes are paramagnetic species containing a square pyramidal cobalt ion coordinated at the apical position by an exogenous water molecule. They exhibit remarkable NIR bands at 1220 (7370 M^–1 cm^–1) and 1060 nm (5560 M^–1 cm^–1), respectively, assigned to a CT transition. DFT calculations and magnetic measurements confirm the paramagnetic (<i>S</i> = 1) ground spin state of the cations. They show that more than 70% of the total spin density in <b>[1-H</b>_<b>2</b><b>O]</b>^<b>+</b> and <b>[2-H</b>_<b>2</b><b>O]</b>^<b>+</b> is localized on the metal, the remaining spin density being distributed over the aromatic rings (30% phenoxyl character). In the presence of <i>N</i>-methylimidazole <b>1</b> and <b>2</b> are irreversibly oxidized by air into the genuine octahedral cobalt­(III) bis­(phenolate) complexes <b>[1-im</b>_<b>2</b><b>]</b>^<b>+</b> and <b>[2-im</b>_<b>2</b><b>]</b>^<b>+</b>, the former being structurally characterized. Neither <b>[1-im</b>_<b>2</b><b>]</b>^<b>+</b> nor <b>[2-im</b>_<b>2</b><b>]</b>^<b>+</b> exhibits a NIR feature in its electronic spectrum. <b>1</b> and <b>2</b> were electrochemically two-electron oxidized into <b>[1]</b>^<b>2+</b> and <b>[2]</b>^<b>2+</b>. The cations were identified as Co­(III)–phenoxyl species by their characteristic absorption band at ca. 400 nm in the UV–vis spectrum. Coordination of the phenoxyl radical to the cobalt­(III) metal ion is evidenced by the EPR signal centered at <i>g</i> = 2.00

Comparative acceptability and perceived clinical utility of monitoring tools: A nationwide survey of patients with inflammatory bowel disease

Background: Objective control of intestinal inflammation during inflammatory bowel disease (IBD) is becoming the main driver for medical treatment. However, the monitoring tools-related burden remains poorly investigated. We aimed to evaluate their comparative acceptability and utility according to patients with IBD. Methods: After a preliminary phase, the final questionnaire encompassing self-administered and physician questionnaires was prospectively and consecutively submitted to 916 patients with IBD from 20 public and private centers. Acceptability and utility visual analog scales (VAS) were expressed as median with interquartile range. Results: Regarding the group of patients with Crohn's disease (n = 618), venipuncture (VAS = 9.3 [8.8-9.7]) and ultrasonography (VAS = 9.3 [8.7-9.7]) were the most acceptable tools (P < 0.0001, for each comparison), whereas rectosigmoidoscopy was the least acceptable tool (VAS = 4.4 [1.2-7.3]) (P < 0.0001, for each comparison). Wireless capsule endoscopy (VAS = 8.5 [5.2-9.3]), magnetic resonance enterocolonography (VAS = 8.0 [5.0-9.2]), and stools collection (VAS = 7.7 [4.6-9.3]) were more acceptable than colonoscopy (VAS = 6.7 [4.3-8.9]) (P < 0.0001, for each comparison). The acceptability was assessed in 298 patients with ulcerative colitis for venipuncture (VAS = 9.4 [8.8-9.7]), stools collection (VAS = 8.1 [5.7-9.4]), colonoscopy (VAS = 7.5 [4.7-9.2]), and rectosigmoidoscopy (VAS = 6.7 [2.8-9.1]); (P < 0.001 for each comparison). All monitoring tools were considered as highly useful by patients with IBD. Decreased acceptability was related to embarrassment for the collection/transport of stools (60.7%), bowel cleansing (76.3%) for colonoscopy, abdominal discomfort (51.3%) and rectal enema (36.6%) for rectosigmoidoscopy, bowel distension (48.3%) for magnetic resonance enterocolonography, and potential capsule retention (21.4%) for wireless capsule endoscopy. Conclusions: Among the IBD monitoring tools, endoscopy demonstrated the lowest acceptability supporting the development of alternative modalities. Patients' information and examination conditions should be improved to ensure proper monitoring adherence