39 research outputs found
Development of a portable electroanalytical system for the stripping voltammetry of metals: Determination of copper in acetic acid soil extracts
No full textThe development, characterisation and evaluation of a prototype portable electrochemical trace metal analyser are presented. The instrument is a battery-powered microcontroller-based potentiostat, which implements anodic stripping voltammetry (ASV) at suitable sensor electrodes. It is capable of operating away from the laboratory, in the absence of an external power source and is usable by low-skilled personnel. The distinguishing feature of the instrument is its custom software, which enables sample pre-screening, data processing and sample dilution and standard additions calculations to be carried out. The instrument has been evaluated by application of a methodology for the detection of copper in acetic acid soil extracts, both in the laboratory and in the field. Underpotential deposition staircase anodic stripping voltammetry (UPD-SCASV) of the copper at gold disk electrodes was used as a test method. There was good agreement between the instrument results and those from laboratory-based reference analytical methods for analyses carried out both in the laboratory and in the field
An Experimental Study of the Influence of an External Signal on the Generation Mode of a Megawatt-Power Gyrotron
No full textInfluence of the structure of higher paraffin hydrocarbons and their derivatives on the mechanism of high-temperature liquid-phase oxidation
No full textTribological properties of bis(tetraalkylammonium) tetrathiomolybdates as precursors of molybdenum sulfide nanoparticles
No full textStereochemistry of the electrophilic-substitution reactions of an indenyl derivative of tin
No full textStereochemistry of the metallotropic equilibrium of (1-methyl-3-phenylindenyl) trimethylstannane
No full textAn X-ray photoelectron spectroscopy study of the effect of sulfur compounds on antiwear properties of diesel fuels
No full textO vozmozhnoy svyazi razvitiya osteopenii s biokhimicheskimi i geneticheskimi markerami kostnogo metabolizmaU sportsmenov posle intensivnoy fizicheskoy nagruzki. chast' 1
No full textДо и после интенсивных силовых тренировок (9 недель) по трём различным протоколам у 22 спортсменов-любителей изучали: изменения биохимических маркёров костного ремоделирования, его нейроэндокринную регуляцию, костную массу до и после тренировочного цикла (ТЦ).
Установлено, что длительная интенсивная физическая нагрузка сопряжена со значительной активацией процессов резорбции костной ткани в сочетании с сохранением высокого уровня синтетических процессов. Тем не менее сравнительно короткая продолжительность экспериментальных тренировок, как и следовало ожидать, не выявила их существенного влияния на показатели МПК всех исследованных участков скелета. Обнаруженные слабо выраженные тенденции могут рассматриваться как случайные флюктуации, не выходящие за пределы технической точност
