检索结果-南通市图书馆

The Determination of Average Stability Constant of NickeI-FA Complex at pH = 8,0 by the Solubility Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2014年第4期8卷 344-348页

作者： giorgi Makharadze Nazi Goliadze Tamar Makharadze Guram Supatashvili Department of Chemistry Ivane Javakhishvili Tbilisi State University Tbilisi 0128 Georgia Department of Hydro Engineering Georgian Technical University Tbilisi 0175 Georgia

At pH = 8, the complex formation process of Ni（Ⅱ） ions with FA was studied by the solubility method. FA were separated from the river Mtkvari by the adsorption-chromotographic method. The charcoal （BAU, Russia） was used as a sorbent. The old suspension of Ni（Ⅱ） hydroxide was used as the solid phase, on which was added the increasing quantity of standard solution of FA. In diluted solutions, at pH = 8.0 the dominant form of Ni（Ⅱ） is nickel dihydroxocomplex Ni（OH）2^0. It was established that in the Ni（OH）2（solid）-Ni（OH）2^0（solution）-FA2-H20 system dominates nickel dyhydroxofulvate complex with the structure 1：1, [Ni（OH）2FA]2-. The average stability constant of nickel dyhydroxofulvate complex was calculated based on experimental data flNi（OH）2FA2＂ = 5.3 × 105.

关键词： Nickel FA average stability constant nickel fulvate water.

Sedimentological Study of Caves in the Zemo Imereti Plateau, Georgia, Caucasus Region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2017年第4期7卷 465-477页

作者： Lasha Asanidze Nino Chikhradze Zaza Lezhava Kukuri Tsikarishvili Jason Polk giorgi Chartolani Vakhushti Bagrationi institute of Geography Ivane Javakhishvili Tbilisi State University Department of Geomorphology Tbilisi Georgia School of Natural Sciences and Engineering Ilia State University Tbilisi Georgia Center for Human Geo Environmental Studies Department of Geography and Geology Western Kentucky University Kentucky USA

The Zemo Imereti Plateau is located in the easternmost part of the limestone region of western Georgia and is Caucasus’ only karst plateau. It is centrally located in a relatively elevated part of the intermountain plain of the country of Georgia. Lithostratigraphical (petrographic, mineralogical, and XRD) research on terrigenous sediments found in caves in the region was conducted in the Upper Cretaceous limestones located at different hypsometric levels (400 - 700 m). This study focused on allochthonous deposits, which, due to sedimentological features, contains significant and complete information for paleogeographic reconstruction as opposed to the autochthonous sediments. Source provinces of the sediments’ origin were determined using petrographic analysis. Lithological study of the terrigenous sediments indicated their origin from the Racha range, as well as their transportation mechanisms, and sedimentation conditions during deposition. Approximate ages (the end of the Middle Pleistocene and the beginning of the Late Pleistocene) of ancient terrestrial sediments in Rganisklde Cave were achieved by taking into account the geological and geomorphological development of the region. Lithostratigraphical analysis of the cave deposits and modern archaeological data indicate that the formation of the caves in the Zemo Imereti plateau took place mainly during the end of the Middle Pleistocene and in the beginning of the Pleistocene;while on the southern slope of the Racha range and in the surrounding area of Ertso-Tsona (Caucasus southern slope), they formed in the Early Pleistocene.

关键词： Terrigenous Sediments Geomorphologic Evolution Zemo Imereti Plateau Georgia

Hydrogen Generation by Reforming of Sodium Hypophosphite on Cobalt-Boron Oxides Containing Catalyst

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green and Sustainable Chemistry 2017年第1期7卷 85-93页

作者： Paata Nikoleishvili giorgi Gorelishvili Valentina Kveselava Gigla Tsurtsumia Nikoloz Nioradze Rusudan Kurtanidze Dali Dzanashvili Raphael Agladze Institute of Inorganic Chemistry and Electrochemistry Ivane Javakhishvili Tbilisi State University Tbilisi Georgia

Cobalt-Boron oxides containing catalyst CoO·B2O3 (CoB2O4) are synthesized for hydrogen generation by catalytic reforming of basic solution of sodium hypophosphite (NaH2PO2) and identified by chemical and X-ray analysis. Reforming is performed in temperature range of 30°C - 80°C. Reaction rate constants at each value of temperature (k30°C = 8.53 × 10?4 s?1;k40°C = 1.62 × 10?4 s??;k50°C = 3.06 × 10?3 s?1;k60°C = 5.06 × 10?3 s?1;k80°C = 1.39 × 10?2 s?1), temperature coefficient of rate of chemical reaction (γ = 0.917) and activation energy (EA = 49.59 kJ·mol?1) are calculated.

关键词： Cobalt-Boron Oxide Hydrogen Catalyst Reforming Sodium Hypophosphite

Waste Water Treatment in Direct Borohydride Fuel Cell with Bipolar Membrane

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Ecology 2015年第2期5卷 22-32页

作者： Paata Nikoleishvili Gigla Tsurtsumia Valentina Kveselava giorgi Gorelishvili Rusudan Kurtanidze Nana Koiava Izolda Kakhniashvili Davit Sharabidze Rafael Agladze Institute of Inorganic Chemistry Electrochemistry of Ivane Javakhishvili Tbilisi State University Tbilisi Georgia

It was established that application of bipolar membrane in a direct borohydride fuel cell (DBFC) with H2O2 co-generation enabled to keep constant pH in catholyte within 2.5 - 3.2 limits, which allowed us to carry out treatment of water polluted by organic compounds in fuel cell catholyte. Treatment of water was carried out by electro-Fenton and photo-electro-Fenton methods. With the view of efficiency, photo-electro-Fenton method of treatment was the most efficient, which enabled to decrease COD of catholytes containing (in each case) phenol, valsaren, 400 g/L dymethoate (BI-58) and valsaciper from 500 ppm to 30, 11, 9 and 3 ppm, respectively after 180 min treatment. By increasing the catholyte temperature from 20℃?to 40℃?in the same period, phenol COD fell to 5 ppm.

关键词： Direct Borohydride Fuel Cell Bipolar Membrane Hydrogen Peroxide Electro-Fenton Photo-Electro-Fenton Water Treatment

Geoecological Monitoring of Karst Water in Georgia, Caucasus (Case Study of Racha Limestone Massif)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2017年第6期7卷 822-829页

作者： Lasha Asanidze Guranda Avkopashvili Kukuri Tsikarishvili Zaza Lezhava Nino Chikhradze Marika Avkopashvili Zurab Samkharadze giorgi Chartolani Department of Geomorphology and Geoecology Vakhushti Bagrationi Institute of Geography Ivane Javakhishvili Tbilisi State University Tbilisi Georgia Condensed Matter Physics Department Andronikashvili Institute of Physics Ivane Javakhishvili Tbilisi State University Tbilisi Georgia School of Natural Sciences and Engineering Ilia State University Tbilisi Georgia Department of Geography Ivane Javakhishvili Tbilisi State University Tbilisi Georgia R. Agladze Institute of Chemistry and Electrochemistry Ivane Javakhishvili Tbilisi State University Tbilisi Georgia

Karst groundwater is the major natural resource of drinking water for many countries in the world. Especially in karstic regions, karst water requirements for settlements are provided from karst aquifers. Also, we should consider, that karst groundwater is becoming more and more valuable for drinking water supply. Thus, karst groundwater quality and permanent ecological monitoring are very important for populations. Moreover, if we consider that the karst landscape is the extremely sensitive system towards anthropogenic activities, since exaclty the anthropogenic activities largely identify the karst water pollution-turbidity causing factors. This paper presents a new study regarding the quality of the karst groundwater of the study area, which contains important resource of drinking water. In the mentioned study, 12 water samples were collected from different locations of the 4 main karst springs (Krikhula, Dolabistavi, Kidobana and Sakishore) during the spring and summer of 2014 and 2015 years. The main aim was to identify chemical compositions (Ni, Ag, Co, Cd, Zn, Pb, Al, Mg, Fe, F, Cu), and also, it was important to detect Escherichia coli (E. coli). Our research regarding all these chemical compositions shows that all the values are low and under the environmental limit according to the Georgian standards. We measured chemical parameters of all these samples by Atomic Absorption Spectroscopy (AAS) in the chemical laboratory of ivane Javakhishvili Tbilisi State University, country of Georgia.

关键词： Karst Water Geoecological Monitoring Limestone Massif Georgia

Magnetometry and Hyperthermia Study of Magnetic Fluid Preparation UNIMAG

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Condensed Matter Physics 2014年第1期4卷 6-12页

作者： Grigor I. Mamniashvili Solomon V. Mikeladze Тatiana О. Gegechkori Besiki V. Surguladze giorgi N. Pichkhaia Anatoli M. Akhalkatsi Dimitri M. Daraselia Davit L. Japaridze Andronikashvili Institute of Physics Ivane Javakhishvili Tbilisi State University Tbilisi Georgia ATT Ltd. Scientific Laboratory “Magnetic Fluids in Medicine and Biology” Tbilisi Georgia ivane Javakhishvili Tbilisi State University Tbilisi Georgia Natishvili Institute of Morphology Ivane Javakhishvili Tbilisi State University Tbilisi Georgia

We investigated the hyperthermal and magnetic properties of the stable magnetic suspension of magnetite nanoparticles. With this purpose in mind, we designed a low-frequency oscillator, 300 W, 300 KHz. A sample of the magnetic suspension was placed in the induction coil and heated up to 55°C for 30 minutes. Based on the results of measurements of transverse susceptibility, we can infer that the suspension was superparamagnetic at room temperature and transformed into the magnetic state at nitrogen temperature. Comparing the obtained experimental results with the literature data, we assessed the mean size of nanoparticles, which made up about 10 nm. Computer simulation assessment on the basis of magnetization curve gives close results.

关键词： Magnetic Nanoparticles Suspension Hyperthermia Magnetometry NMR