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[en] LiVO is the only d-electron heavy fermion compound. The HF state in this compound was proved using different experimental techniques. However the mechanism for heavy fermion is still unknown. We performed the thermal transport measurement in order to reveal the mechanism for HF behavior.
[en] A process is described for recuperating hydrofluoric acid from a mixture of gaseous hydrofluoric acid, water vapour and uncondensable gases. In this process, condensation is first effected, after which the hydrofluoric acid solution obtained is directed to a storage tank then the remaining hydrofluoric gas and the uncondensable gases are put through a scrubber via base, after which the residual hydrofluoric gas traces are neutralized by passing them through a column where the gas is fixed
[fr]On decrit un procede pour recuperer de l'acide fluorhydrique a partir d'un melange d'acide fluorhydrique gazeux, de vapeur d'eau et de gaz incondensables, caracterise en ce qu'on execute tout d'abord une condensation a l'issue de laquelle on dirige la solution d'acide fluorhydrique obtenue vers un lieu de stockage, puis on fait passer le gaz fluorhydrique restant et les gaz incondensables dans un dispositif de lavage par une base, apres quoi on procede a une neutralisation des traces de gaz fluorhydrique residuelles issues de la tour de lavage en faisant passer celles-ci dans une colonne ou le gaz est fixe
[en] A literature review was conducted of the acute toxicity of hydrogen fluoride (HF) with emphasis on the effects of inhalation of gaseous HF. The data and findings of the relevant references were summarized under four categories: animal studies, controlled human studies, community exposure and industrial exposure. These were critically reviewed and then lethal concentration-time relationships were developed for humans, corresponding to LCsub(LO), LCsub(10) and LCsub(50) levels. The effects of age, health and other physiological variables on the sensitivity to HF were discussed, as well as antagonistic and synergistic effects with other substances
[en] In this study, electrical and structural remodeling of ventricles was examined in tachycardia-induced heart failure (HF). We studied two groups of weight-matched adult male mongrel dogs: a sham-operated control group (n=5) and a pacing group (n=5) that underwent ventricular pacing at 230 bpm for 3 weeks. Clinical symptoms of congestive HF were observed in both groups. Their hemodynamic parameters were determined and the severity of the HF was evaluated by M-mode echocardiography. Changes in heart morphology were observed by scanning electron and light microscopy. Ventricular action potential duration (APD), as well as the 50 and 90% APD were measured in both groups. All dogs exhibited clinical symptoms of congestive HF after rapid right ventricular pacing for 3 weeks. These data indicate that rapid, right ventricular pacing produces a useful experimental model of low-output HF in dogs, characterized by biventricular pump dysfunction, biventricular cardiac dilation, and non-ischemic impairment of left ventricular contractility. Electrical and structural myocardial remodeling play an essential role in congestive HF progression, and should thus be prevented
[en] A procedure for the determination of free hydrogen fluoride (HF) in uranium tetrafluoride is outlined. The method is based on the separation of free HF and UO2F2 from UF4 by leaching with cold water. After filtration one aliquot of the filtrate is percolated through a strong cationic ion exchanger (H form), which retains the uranyl ion. The determination of the total hydrofluoric acid is made in the effluent by titration with sodium hydroxide. Being known the number of equivalent-weight for the total HF and for the total uranium, the content of free HF in the sample is calculated. In practice the method allows the determination of HF content in UF4 starting from 0,1% with a relative error o <= 3%. (author)
[en] Highlights: • Exosomes derived from DPCs (DPC-Exos) significantly induced anagen while delaying catagen in mice. • DPC-Exos enhanced the proliferation and migration of outer root sheath cells in vitro. • These effects of DPC-Exos were mediated by β-catenin and Sonic hedgehog signaling. Dermal papilla cells (DPCs) play a critical role in the regulation of hair follicle (HF) growth, formation, and cycling. DPCs are thought to regulate HF growth through a paracrine mechanism, in which exosomes may play a critical role.
[en] The invention provides a process for continuous preparation of uranium tetrafluoride with coarse particle size. Another object of the present invention is to provide an apparatus used for practising the above described process. According to the present invention, there is provided a process for continuous preparation of uranium tetrafluoride comprising the steps of continuously feeding uranous solution and hydrofluoric acid into the lower section of a reaction vessel to produce crystal particles of uranium tetrafluoride, hydrofluoric acid being fed so as to keep its concentration in the reaction vessel low in order to avoid extreme supersaturation when hydrofluoric acid contacts with the uranous solution, floating up and suspending the crystal particles thus produced into the upper section of the reaction vessel by the action of agitation to grow up the crystal particles, the temperature in the reaction vessel being maintained within a range of from about 900C to a boiling temperature of the solution in the vessel, and then precipitating and discharging the thus grown up crystal particles from the bottom of the vessel, while overflowing a waste solution from the top the vessel