Structural, magnetic and vibrational characterization of the new organic-inorganic hybrid material, (C9H14N)2CoCl4

A new organic–inorganic hybrid material, bis (N, N-dimethylbenzylammonium) tetrachlorocobaltate (II), (C9H14N)2 CoCl4 was synthesized and analyzed by X-ray diffraction. Magnetization was used to investigate the magnetic properties. The structure was determined at room temperature in the triclinic space group P-1 with the following parameters: a = 10.491 (5)Å, b = 14.207 (2)Å, c = 16.187 (3)Å, α = 87.76 (3)°, β = 88.436 (8)°, γ = 89.897 (10)° and Z = 2. The structure can be described by the alternation of organic-inorganic layers parallel to (110) plan. The different components are connected by the Nsingle bondH⋯Cl hydrogen bonds between the cation and the anionic group [CoCl4]2-. Raman and infrared spectra were used to gain more information of the title compound. An assignment of the observed vibration modes is reported. This compound exhibits an antiferromagnetic (AFM) to paramagnetic (PM) phase transition at a temperature (TN) lower than 2 K. The values of paramagnetic Curie–Weiss temperature θCW, the nearest neighbor interaction Jnn, the classical nearest neighbor J cl and the dipolar Dnn interactions’ emphasize the existence of an antiferromagnetic interaction between the neighboring cobalt ions.publishe

The perception system of intelligent ground vehicles in all weather conditions: A systematic literature review

Perception is a vital part of driving. Every year, the loss in visibility due to snow, fog, and rain causes serious accidents worldwide. Therefore, it is important to be aware of the impact of weather conditions on perception performance while driving on highways and urban traffic in all weather conditions. The goal of this paper is to provide a survey of sensing technologies used to detect the surrounding environment and obstacles during driving maneuvers in different weather conditions. Firstly, some important historical milestones are presented. Secondly, the state-of-the-art automated driving applications (adaptive cruise control, pedestrian collision avoidance, etc.) are introduced with a focus on all-weather activity. Thirdly, the most involved sensor technologies (radar, lidar, ultrasonic, camera, and far-infrared) employed by automated driving applications are studied. Furthermore, the difference between the current and expected states of performance is determined by the use of spider charts. As a result, a fusion perspective is proposed that can fill gaps and increase the robustness of the perception system

Sélection de nouvelles lignées de blé tendre hautement productives et résistantes à la cécidomyie, Mayetiola destructor (Say), au Maroc

Le blé (Triticum sp.) constitue l’alimentation de base de la population Marocaine. Toutefois, cette culture est attaquée par plusieurs maladies et ravageurs, dont la mouche de Hesse. Cet insecte est le ravageur le plus redoutable du blé, causant des pertes annuelles en rendement de plus de 30%. Dans le but de sélectionner un germoplasme qui combine la résistance à la cécidomyie, Mayetiola destructor (Say), et un haut potentiel de rendement, une pépinière de blé tendre HF_SBWYT_MOR_ON de 160 lignées provenant de l’ICARDA (International Center for Agricultural Research in the Dry Areas) a été évaluée pour la résistance à la cécidomyie de blé et pour le potentiel de rendement sous serre, et dans quatre environnements (sites) du Maroc: Chaouia, Abda, Doukkala et Tadla, représentés par les domaines expérimentaux de Sidi El Aidi, Jemaa Shaim, Khemis Zemamra et Deroua. L'analyse de la variance a montré des effets hautement significatifs (P<0,0001) des paramètres site, génotype et l’interaction site x génotype, pour les tests de résistance à la cécidomyie ou de rendement grain. L’évaluation sous serre a révéléque 87,5% des lignées de la pépinière sont résistantes, 9,4 % hétérogènes et 3,1 sensibles. Les lignées sont dérivées de parents résistants et expriment l’antibiosis comme mécanisme de résistance. Les meilleurs rendements en grain ont été obtenus dans la station expérimentale de Deroua conduite sous régime irrigué : 23,7 à 86 qx/ha dépassant largement la moyenne nationale (18 qx/ha). Les plus faibles rendements ont été obtenus à Khemis Zemamra: 7,7 à 41,3 qx/ha.

Convalescent plasma in patients admitted to hospital with COVID-19 (RECOVERY): a randomised controlled, open-label, platform trial

Background: Many patients with COVID-19 have been treated with plasma containing anti-SARS-CoV-2 antibodies. We aimed to evaluate the safety and efficacy of convalescent plasma therapy in patients admitted to hospital with COVID-19. Methods: This randomised, controlled, open-label, platform trial (Randomised Evaluation of COVID-19 Therapy [RECOVERY]) is assessing several possible treatments in patients hospitalised with COVID-19 in the UK. The trial is underway at 177 NHS hospitals from across the UK. Eligible and consenting patients were randomly assigned (1:1) to receive either usual care alone (usual care group) or usual care plus high-titre convalescent plasma (convalescent plasma group). The primary outcome was 28-day mortality, analysed on an intention-to-treat basis. The trial is registered with ISRCTN, 50189673, and ClinicalTrials.gov, NCT04381936. Findings: Between May 28, 2020, and Jan 15, 2021, 11558 (71%) of 16287 patients enrolled in RECOVERY were eligible to receive convalescent plasma and were assigned to either the convalescent plasma group or the usual care group. There was no significant difference in 28-day mortality between the two groups: 1399 (24%) of 5795 patients in the convalescent plasma group and 1408 (24%) of 5763 patients in the usual care group died within 28 days (rate ratio 1·00, 95% CI 0·93–1·07; p=0·95). The 28-day mortality rate ratio was similar in all prespecified subgroups of patients, including in those patients without detectable SARS-CoV-2 antibodies at randomisation. Allocation to convalescent plasma had no significant effect on the proportion of patients discharged from hospital within 28 days (3832 [66%] patients in the convalescent plasma group vs 3822 [66%] patients in the usual care group; rate ratio 0·99, 95% CI 0·94–1·03; p=0·57). Among those not on invasive mechanical ventilation at randomisation, there was no significant difference in the proportion of patients meeting the composite endpoint of progression to invasive mechanical ventilation or death (1568 [29%] of 5493 patients in the convalescent plasma group vs 1568 [29%] of 5448 patients in the usual care group; rate ratio 0·99, 95% CI 0·93–1·05; p=0·79). Interpretation: In patients hospitalised with COVID-19, high-titre convalescent plasma did not improve survival or other prespecified clinical outcomes. Funding: UK Research and Innovation (Medical Research Council) and National Institute of Health Research

Tocilizumab in patients admitted to hospital with COVID-19 (RECOVERY): a randomised, controlled, open-label, platform trial

Background: In this study, we aimed to evaluate the effects of tocilizumab in adult patients admitted to hospital with COVID-19 with both hypoxia and systemic inflammation. Methods: This randomised, controlled, open-label, platform trial (Randomised Evaluation of COVID-19 Therapy [RECOVERY]), is assessing several possible treatments in patients hospitalised with COVID-19 in the UK. Those trial participants with hypoxia (oxygen saturation &lt;92% on air or requiring oxygen therapy) and evidence of systemic inflammation (C-reactive protein ≥75 mg/L) were eligible for random assignment in a 1:1 ratio to usual standard of care alone versus usual standard of care plus tocilizumab at a dose of 400 mg–800 mg (depending on weight) given intravenously. A second dose could be given 12–24 h later if the patient's condition had not improved. The primary outcome was 28-day mortality, assessed in the intention-to-treat population. The trial is registered with ISRCTN (50189673) and ClinicalTrials.gov (NCT04381936). Findings: Between April 23, 2020, and Jan 24, 2021, 4116 adults of 21 550 patients enrolled into the RECOVERY trial were included in the assessment of tocilizumab, including 3385 (82%) patients receiving systemic corticosteroids. Overall, 621 (31%) of the 2022 patients allocated tocilizumab and 729 (35%) of the 2094 patients allocated to usual care died within 28 days (rate ratio 0·85; 95% CI 0·76–0·94; p=0·0028). Consistent results were seen in all prespecified subgroups of patients, including those receiving systemic corticosteroids. Patients allocated to tocilizumab were more likely to be discharged from hospital within 28 days (57% vs 50%; rate ratio 1·22; 1·12–1·33; p&lt;0·0001). Among those not receiving invasive mechanical ventilation at baseline, patients allocated tocilizumab were less likely to reach the composite endpoint of invasive mechanical ventilation or death (35% vs 42%; risk ratio 0·84; 95% CI 0·77–0·92; p&lt;0·0001). Interpretation: In hospitalised COVID-19 patients with hypoxia and systemic inflammation, tocilizumab improved survival and other clinical outcomes. These benefits were seen regardless of the amount of respiratory support and were additional to the benefits of systemic corticosteroids. Funding: UK Research and Innovation (Medical Research Council) and National Institute of Health Research

TRANSPORT PROPERTIES, GIANT MOMENTS AND NEARLY MAGNETIC IMPURITIES IN SOME NICKEL ALLOYS NEAR THE MAGNETIC TRANSITION

L'étude systématique d'une série d'alliages concentrés à base de nickel du type Ni 1-cTc (T = V, Mo, Cr, Ru, Ir) a mis en évidence des propriétés de transport ainsi que des propriétés magnétiques particulières au voisinage de la transition de l'état paramagnétique vers l'état ferromagnétique. Des mesures d'aimantation ont été effectuées dans des champs magnétiques allant de 0 à 52 kOe et pour un domaine de température compris entre 1,7 K et 300 K. Les résultats obtenus et leur analyse permettent d'attribuer la très forte contribution à la résistivité, aux alentours de la transition magnétique, à l'existence d'impuretés presque magnétiques et magnétiques (nuages). De plus, les mesures de magnétorésistance mettent en évidence le blocage — par un champ magnétique —des processus de diffusion par renversement de spins dus à ces impuretés.Magnetic measurements as well as electrical resistivity and magnetoresistance measurements for temperatures ranging between 1.2 K and 300 K show that the transition from the para- to the ferromagnetic state, for nickel based concentrated alloys, occurs in a rather inhomogeneous way. The magnetic and transport properties show evidence for the existence of giant moments and nearly magnetic impurities whose concentrations increase with increasing nickel content

Crystal structure, vibrational and magnetic properties of the monohydrated cobalt (II) complex with 1-(4-Nitrophenyl)-1H-imidazolium cation, (C9H8N3O2)2CoCl4·H2O

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Structural characterization, thermal studies, vibrational and DFT investigation of the bis(8-hydroxyquinolinium)tetrachlorocadmate(II)

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