bluuebunny/crossref_metadata_2025_split huggingface dataset:
Direct and simultaneous determination of metal impurities in catalysts based on platinum group elements
Authors: Abusenaina Ashraf , Vojteková Viera , Flórián Karol , Poperníková Zuzana , Mičková Vladislava , Hámborská Miroslava , Ružičková Silvia 
Published: March 2014

Abstract
Production of new catalysts requires effective analytical quality control. The study of trace element composition of heterogeneous catalysts, based on C+PdO, using atomic emission spectrometry (AES) was carried out. A new method for the direct solid-state analysis by means of AES with direct current arc discharge was developed. On the basis of the qualitative analysis of elements, Al, Fe, Ni, Si and Ti have been identified, and for these elements, the quantitative method of determination has been developed. Optimization of excitation parameters and validation of the analytical method are presented. Calibration samples of the following composition were prepared: graphite powder (as a matrix), 3% of PdO and increasing contents of determined element oxides (spectrally pure). Calibrations were calculated by means of the least squares method. Working range for element impurities was from 1% to 0.0003%, and the limits of quantification — LOQ, (10-σ criterion) varied in the range from 0.002% (Ti) to 0.0038% (Si). For the control of active component, palladium was calibrated (working range — 0.01%–10.00%; LOQ −0.027%). The developed method can be used, also, for the elemental determinations of the other carbon based catalysts with the different active components (of platinum group elements).
Significance of water quality and radiation wavelength for UV photolysis of PhCs in simulated mixed solutions
Authors: Giri Rabindra , Ozaki Hiroaki , Guo Xia , Takanami Ryohei , Taniguchi Shogo 
Published: March 2014

Abstract
Ultraviolet (UV) photolysis of sixteen pharmaceutical compounds (PhCs) in mixed solutions with four types of water and two sets of UV radiation was investigated. UVC (254 nm) photolysis was ineffective at eliminating a large number of PhCs while a big number of them were refractory. However, vacuum UV (VUV: 185 nm + 254 nm) photolysis in the same experimental conditions eliminated the PhCs almost completely. The eliminations in ultrapure water (UPW), tap water (TW) and Neya River water (NRW) and their organic/inorganic contents were inversely correlated, which was more evident in VUV photolysis. Natural organic matter (NOM) in NRW did not have an impact in indirect photolysis, but effluent organic matter (EfOM) in secondary-treated effluent (NWTPE) enhanced indirect photolysis, which was more evident in VUV photolysis underlining the point that radiation wavelength/intensity can be a limiting factor in organic-rich waters. Moreover, VUV photolysis was far superior (90% mineralization) to UVC photolysis (10% mineralization) for PhCs mineralization. The greatly enhanced elimination and mineralization efficiencies observed for VUV photolysis were attributed to accelerated direct photolysis with 185 nm wavelength and indirect photolysis involving ·OH. The results demonstrated efficacy of VUV photolysis in wastewater treatment and its potential use as a tertiary treatment.
Multicomponent spectrometric analysis of riboflavin and photoproducts and their kinetic applications
Authors: Sheraz Muhammad , Kazi Sadia , Ahmed Sofia , Qadeer Kiran , Khan Marium , Ahmad Iqbal 
Published: March 2014

Abstract
Riboflavin (RF) is a light sensitive compound and is known to form a number of photoproducts. These photoproducts possess the same nucleus and may interfere in the analysis of RF by UV and visible spectrometry. Therefore, it is necessary to apply the methods of multicomponent spectrometric analysis to quantify the vitamin and its photoproducts accurately. Such methods are useful in the study of the kinetics of photodegradation reactions of RF to obtain accurate and reliable results. Any interference in these methods due to linear or nonlinear irrelevant absorption of the minor unknown products can be accounted for by the application of appropriate correction procedures prior to kinetic treatment. Various factors affecting the accuracy, precision and selectivity of these analytical procedures are also discussed. This review highlights the principles and applications of multicomponent spectrometric methods and their application to the simultaneous determination of RF and its major photoproducts in degraded solutions to evaluate the kinetics of degradation.
Bismuth and Bismuth-Chitosan modified electrodes for determination of two synthetic food colorants by net analyte signal standard addition method
Authors: Asadpour-Zeynali Karim , Mollarasouli Fariba 
Published: March 2014

Abstract
In this paper, an electrochemical application of bismuth film modified glassy carbon electrode for azo-colorants determination was investigated. Bismuth-film electrode (BiFE) was prepared by ex-situ depositing of bismuth onto glassy carbon electrode. The plating potential was −0.78 V (vs. SCE) in a solution of 0.15 mg mL−1 Bi(III) and 0.05 mg mL−1 KBr for 180 s. In the next step, a thin film of chitosan was deposited on the surface of bismuth modified glassy carbon electrode, thus the bismuth-chitosan thin film modified glassy carbon electrode (Bi-CHIT/GCE) was fabricated and compared with bare GCE and bismuth modified GCE.
Azo-colorants such as Sunset Yellow and Carmoisine were determined on these electrodes by differential pulse voltammetry. Due to overlapping peaks of Sunset Yellow and Carmoisine, simultaneous determination of them is not possible, so net analyte signal standard addition method (NASSAM) was used for this determination. The results showed that coated chitosan can enhance the bismuth film sensitivity, improve the mechanical stability without caused contamination of surface electrode. The Bi-CHIT/GC electrode behaved linearly to Sunset Yellow and Carmoisine in the concentration range of 5×10−6 to 2.38×10−4 M and 1×10−6 to 0.41×10−4 M with a detection limit of 10 µM (4.52 µg mL−1) and 10 µM (5.47 µg mL−1), respectively
Chemical characterization of particulate matter (PM) and source apportionment study during winter and summer period for the city of Kozani, Greece
Authors: Tolis Evangelos , Saraga Dikaia , Ammari George , Gkanas Evangelos , Gougoulas Theofilos , Papaioannou Christina , Sarioglou Anastasios , Kougioumtzidis Eleftherios , Skemperi Athina , Bartzis John 
Published: March 2014

Abstract
Eordaia basin located in northwest of Greece, comprises an area which is characterized by intense energy related activities, including coal burning at four power plants and the associated mining operations. Air samples of inhalable (PM10) and respirable particles (PM2.5) were collected in cold and warm periods in 2010 at an urban background site of Kozani, the major city and capital of the region which is located close to the power plants. Particulate matter concentration, particle-bound polycyclic aromatic hydrocarbons and anionic species concentrations were determined using gravimetric, GC-MS in SIM mode and Ion Chromatography analysis, respectively. For the cold period, the mean PM10 and PM2.5 mass concentration was found to be 19.62 and 14.68 µg m−3, respectively. Correspondingly, for the warm period, the mean PM10 and PM2.5 values were 35.29 and 25.75 µg m−3, respectively. In general, the results indicated that the major sources of air pollution in Kozani are traffic, combustion from agricultural activities and lignite power plants emissions, contributing by different percentages to each particle fraction.
Azobenzene functionalized mesoporous AlMCM-41-type support for drug release applications
Authors: Mitran Raul-Augustin , Berger Daniela , Băjenaru Laura , Năstase Silviu , Andronescu Cristian , Matei Cristian 
Published: March 2014

Abstract
A light-responsive material, aminoazobenzene functionalized AlMCM-41, was synthesized and characterized in order to be used as carrier for drug delivery devices. The light-induced hydrophobic-hydrophilic switching effect of azobenzene functionalized aluminosilicate was exploited in the release of irinotecan, a cytostatic drug. To obtain the functionalized mesoporous support, an azobenzene-silane precursor was synthesized by coupling 4-(4′-aminophenylazo) benzoic acid with 3-aminopropyl triethoxysilane and further grafted on AlMCM-41. The azobenzene functionalized mesoporous aluminosilicate exhibited no significant toxicity towards murine fibroblast healthy cells and a reduced toxicity towards murine melanocyte cells. The hybrid materials obtained by loading irinotecan on AlMCM-41 (wt. 35.4%) and aminoazobenzene modified AlMCM-41 (wt. 22%), respectively were characterized by FTIR, small and wide angle XRD, N2 adsorption-desorption isotherms and DSC analyses. A two-fold increase in the drug release rate from azobenzene functionalized aluminosilicate in phosphate buffer solution under UV irradiation was noticed, as compared with dark conditions. Moreover, the azobenzene functionalization of AlMCM-41 significantly increased the irinotecan delivery rate and total cumulative release in comparison with the pristine AlMCM-41 in similar conditions.
In vitro hemocompatibility and corrosion behavior of new Zr-binary alloys in whole human blood
Authors: Totea Georgeta , Ionita Daniela , Demetrescu Ioana , Mitache Mihaela 
Published: March 2014

Abstract
The aim of this study is to evaluate the accuracy of three binary alloys’ composition, and their biocompatibility. Depending on the intended use of the medical devices made from these materials, dynamic or static tests should be performed. We have chosen static tests as we thought they may be used as knee or hip replacement, and not as cardiac valves.
Three binary alloys ( Zr10Nb, Zr2.5Nb and Zr12Ta) were obtained from high purity powders (>99.9%), using an induction furnace first, and an electric arc furnace for a perfect homogenization. Their final composition was verified with a XRF analyzer-INNOV-X.
Hemolysis tests can determine the degree of red blood cells lysis and the release of hemoglobin. The released hemoglobin quantity was extremely small, under 2%, in all cases, and the coagulation tests showed no risk for thrombosis. The electrochemical behavior was also studied in biological fluid, human female serum, and showed a low corrosion rate.
The obtained alloys do not cause hemolysis, so they are hemocompatible with all blood types.
Synthesis, characterization and controlled toxicity of a novel hybrid material based on cisplatin and docetaxel
Authors: Prodana Mariana , Voiculet Adriana , Garea Sorina , Radu Mihaela , Iovu Horia , Demetrescu Ioana , Dinischiotu Anca 
Published: March 2014

Abstract
This paper is focused on the synthesis and characterization of a novel hybrid material based on cisplatin and docetaxel-loaded functionalized simultanously carbon nanotubes able to be used in cancer therapy as drug delivery system with controlled toxicity. This material was physico-chemically investigated by determining the structure, as evidenced by Fourier transform infrared (FTIR) spectroscopy, transmission electronmicroscopy (TEM) and its stability was studied with the aid of thermogravimetric analysis (TGA). The amount of platinum ions released into the solution of simulated body fluid (SBF) was highlighted by coupled plasma mass spectrometry (ICP-MS). Toxicology experiments were performed with MDA-MB 231 breast cancer epithelial cells. The performance of the new drug delivery hybrid material was compared with functionalised carbon nanotubes with therapeutic agents functionalized with a single therapeutic agent.
Ultratrace-level determination of N-Nitrosodimethylamine, N-Nitrosodiethylamine, and N-Nitrosomorpholine in waters by solid-phase extraction followed by liquid chromatography-tandem mass spectrometry
Authors: Kadmi Yassine , Favier Lidia , Soutrel Isabelle , Lemasle Marguerite , Wolbert Dominique 
Published: March 2014

AbstractN-nitrosamines are a new class of emerging nitrogenous drinking water disinfection by-products. These compounds are probably carcinogenic which could seriously affect the safety of drinking water consumers. The aim of this study is to develop a simple, fast, and specific analytical method for the routine determination of low part per trillion levels of N-nitrosamines in waters. An ultra high pressure liquid chromatography coupled with tandem mass spectrometry (UHPLC/MS/MS) method was developed for the qualitative and quantitative analysis of N-nitrosamines in waters. N-nitrosamines were extracted, purified and concentrated from water samples in one step using a solid-phase extraction (SPE). The compounds were detected in multiple reaction monitoring via electrospray ionisation source with positive ionisation mode. To achieve symmetrical peak shapes and a short chromatographic analysis time, the mobile phase consisting of acetonitrile, water and formic acid (60:40:0.1, v/v/v) was used in the experiment. Chromatographic separation of N-nitrosamines was done in less than two minutes. All calibration curves had good linearity (r2≥ 0.9989). The intra- and inter-day precision of the assay ranged from 0.59% to 3.11% and accuracy ranged from 99.66% to 104.1%. The mean recoveries of N-nitrosamines in spiked water were 98%-101%. The reproducability was acceptable with relative standard deviations of less than 3.53%. The proposed method yielded detection limits very low which ranges from 0.04 to 0.16 ng L−1. Finally, the developed analytical method was successfully applied to the analysis of N-nitrosamines in natural water sample
Rich families and elementary submodels
Authors: Cúth Marek , Kalenda Ondřej 
Published: March 2014

Abstract
We compare two methods of proving separable reduction theorems in functional analysis — the method of rich families and the method of elementary submodels. We show that any result proved using rich families holds also when formulated with elementary submodels and the converse is true in spaces with fundamental minimal system and in spaces of density ℵ1. We do not know whether the converse is true in general. We apply our results to show that a projectional skeleton may be without loss of generality indexed by ranges of its projections.
Planck-scale corrections to Friedmann equation
Authors: Awad Adel , Ali Ahmed 
Published: March 2014

AbstractRecently, Verlinde proposed that gravity is an emergent phenomenon which originates from an entropic force. In this work, we extend Verlinde’s proposal to accommodate generalized uncertainty principles (GUP), which are suggested by some approaches to quantum gravity such as string theory, black hole physics and doubly special relativity (DSR). Using Verlinde’s proposal and two known models of GUPs, we obtain modifications to Newton’s law of gravitation as well as the Friedmann equation. Our modification to the Friedmann equation includes higher powers of the Hubble parameter which is used to obtain a corresponding Raychaudhuri equation. Solving this equation, we obtain a leading Planck-scale correction to Friedmann-Robertson-Walker (FRW) solutions for the p = ωp equation of state.
The Role of the President in the Context of the Political Changes in Slovakia
Authors: Horváth Peter 
Published: March 2014

Abstract
The aim of the article is to introduce a number of determinants that influence the activities of the office of the President of the Slovak Republic. They caused numerous transformations, which were implemented into our constitutional order over the time. The relations between president and government within the executive power is the most common theme of amendments to the Constitution of the Slovak Republic. Even the introduction of the institute of direct election for the head of state in 1999 arose as the result of strained relations between the same power entities. Therefore, there is a clear tendency that only if both components of the executive power come from the same political background, they carry out their activities in a positive way. This statement can be demonstrated by the political development in Slovakia after the year 2010 - throughout the government of Iveta Radičová, as well as Robert Fico.
Overview of the Implementation of the EU Youth Strategy in the Field of Employment
Authors: Kovacheva Siyka 
Published: March 2014

Abstract
This paper provides an overview of the implementation of the EU Youth Strategy for the promotion of youth employment and entrepreneurship in the EU Member States and four non-EU states: Croatia2, Montenegro, Norway and Switzerland. It relies upon the National Reports (NRs) presenting the policy initiatives designed and accomplished during the first cycle (2010-2012) in these countries and submitted in response to a questionnaire developed by the European Commission (EC) and an examination of policy documents, academic literature and statistical data. The comparative analysis reveals a shared awareness of the gravity of the problems accumulated in the labour market integration of young people and attests to the enormous efforts put forward on European, national, regional and local levels for overcoming youth disadvantage. It also highlights the opportunities created by sharing good practices and fostering of cooperation among all policy actors for supporting the young generation to make a successful entry in the world of work.
Europeanisation of Slovak Parties’ Programmatic Documents for EP Elections: A Drop in the Bucket, or a Light at the End of the Tunnel?
Authors: Kovář Jan 
Published: March 2014

Abstract
Elections to the European Parliament fall within the category of second-order elections. Because there is less at stake in these types of contests voters behave differently when casting votes. But the question remains: do political parties also perceive that there is less at stake in these elections and behave differently than in national first-order elections? This paper conducts a content analysis, within a comparative framework, of selected Slovak political parties’ programmatic documents for EP elections to explicitly link the SOE model to independent behaviour of political parties. The results show that Slovak parties’ Euromanifestos feature an apparent degree of Europeanisation and exhibited only limited second-order characteristics. Consequently, these findings are discussed in the light of relevant literature.
MicroRNA-21 inhibitor potentiates anti-tumor effect of radiation therapy in vitro and in vivo
Authors: Cho Bong Jun , Kim Hans H. , Lee David J , Choi Eun Jung , Hwang Yeo Hyun , Chun Sun Ha , Kim In Ah 
Published: March 2014

AbstractMicroRNA-21 (miR-21) plays important roles in carcinogenesis and is highly expressed in diverse human cancers. We evaluated the potential of targeting miRNA-21 to overcome the radioresistance of human cancer cells having an activated EGFR2-associated signaling and also aimed to elucidate the mechanisms of radiosensitization, and the effect on epithelial- mesenchymal transition (EMT). Ectopic overexpression of miR-21 up-regulated EGFR/HER2-associated signaling and increased radioresistance of a panel of human cancer cells (U251, U87, and A549 cells). In contrast, a specific inhibitor of miR-21 attenuated this signaling and radiosensitized a panel of human cancer cells. Inhibition of miR-21 was associated with persistent γH2AX foci formation. Inhibition of miR-21 decreased the typical features of EMT, such as invasion and migration and vascular tube formation. Treatment with anti-miR-21 decreased tumor burden in nude mice bearing intracranial U251 xenografts compared to controls. Combined treatment of anti-miR-21 and radiation further decreased tumor burden compared to each treatment alone. In summary, miR-21 is an important onco-miR, which confers radioresistance and diverse features of EMT. Inhibition of miR-21 could be a potential strategy for improving the efficacy of radiation therapy via unique modulation of pro-survival signaling implicated in radiation response and EMT.
Omalus sculpticollis as the Main Enemy of Psenulus fuscipennis (Hymenoptera, Chrysididae, Crabronidae) in the Crimea, Ukraine
Authors: Martynova K. V. , Fateryga A. V. 
Published: March 2014

Abstract
he trap-nest technique was tested in the Karadag Nature Reserve (Crimea, Ukraine). In the result the enemies of Psenulus fuscipennis (Dahlbom, 1843), which caused damage to its progeny, were revealed: Omalus sculpticollis Abeille, 1878, Melittobia acasta Walker, 1839, Perithous septemcinctorius (Th unberg, 1822), and Trichodes apiarius Linnaeus, 1758. Th e structure of the parasite complex, voltinity of the species, comparative eff ectiveness of enemies are determined on the basis of observed data. Th e taxonomical position of O. sculpticollis is discussed, its sexual dimorphism is illustrated, the detailed description of the cocoon and some structural features of the last instar larva are given for the first time. Feeding habits of the larvae of O. sculpticollis are examined and the delicate aspects of interaction with the host are discussed. Short notes on terminology are given
Experimental study of PHWR debris bed under boil-off condition
Authors: Mukhopadhyay D. , Vijayan P. K. , Ghosh A. K. , Sahoo P. K. 
Published: March 2014

Abstract
Experiments have been carried out to study the heatup behavior of a submerged debris bed constituted of segmented reactor channels of Pressurized Heavy Water Reactors (PHWR). The study has been done for under fully submerged, partially submerged and nearly exposed conditions. This situation may arise from a severe accident scenario of PHWR where full or segmented reactor channels are likely to be disassembled and form a submerged debris bed. An assembly of electrical heater rod, simulating fuel bundle and channel components like Pressure tube and calandria tube constitute each segmented reactor channels. Ten such reactor channels constitute the debris bed. Heatup of this debris bed is observed with respect to different water levels and at power levels of 10, 20 and 30 kW, typical to decay power levels of 0.25 %, 0.5 % and 0.75 % of reactor full power respectively. It has been observed from the set of experiments that fully submerged debris bed does not get heated up and fuel rod temperature remains at saturation temperature. Heatup is observed for exposed channels only, however the heatup rate is limited with steam and radiative cooling. For exposed debris bed, channels surrounded by neighboring channels get heated up as compared to channels at the periphery of the debris bed.
Theoretical study of deuteron induced reactions on 6,7Li, 9Be and 19F targets
Authors: Yiğit M. , Tel E. 
Published: March 2014

Abstract
The nuclear reactions of the deuteron particles with light nuclei have been extensively investigated in the history of nuclear physics. In this work, the cross-sections of deuteron reactions 6Li(d,n)7Be, 6Li(d,t)5Li, 7Li(d,2n)7Be, 7Li(d,p)8Li, 7Li(d,t)6Li, 9Be(d,p)10Be, 9Be(d,t)8Be, 19F(d,n)20Ne and 19F(d,p)20F were studied for the investigation of structural fusion materials. Excitation functions of these reactions were determined by using ALICE-ASH code considering equilibrium (EQ) and pre-equilibrium (PEQ) effects. The calculated cross-sections, experimental results and TENDL-2011 library data are presented in graphical form.
Assessment of the radiological health damage costs of the Yeniköy and Kemerköy lignite-fired power plants in Muğla
Authors: Köne A. Ç. , Büke T. 
Published: March 2014

Abstract
The health impacts and corresponding damage costs of radioactive emissions of Yeniköy and Kemerköy lignite-fired power plants in Muğla have been assessed by using the simplified impact pathway approach. Radiation dose and risk calculations have been carried out by the code CAP88-PC around the power plants. Specific isotopes, 226Ra, 232Th, 40K and 238U in the flying ash samples are considered as radioactive sources. The estimated total collective doses around Yeniköy and Kemerköy power plants are 3.15 × 10−4 man Sv/year and 3.77 × 10−4 man Sv/year. Health effects and the corresponding damage costs around the power plants due to radioactive emissions from the power plants are negligible.