Heavily vanadium-doped LiFePO4 olivine as electrode material for Li-ion aqueous rechargeable batteries

Since LiFePO4 batteries play a major role in the transition to safe, more affordable and sustainable energy production, numerous strategies have been applied to modify LFP cathode, with the aim of improving its electrochemistry. In this contribution, a highly vanadium-doped LiFe0.9V0.1PO4/C composite (LFP/C-10V) is synthesized using the glycine combustion method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetry Differential Thermal Analysis (TGDTA) and Cyclic Voltammetry (CV). It is shown that 10wt.% of vanadium can substitute Fe positions, thus decreasing unit cell volume, which is followed by generation of Li3V2PO4 traces, as detected by CV. High vanadium doping does not change the carbon content in the composite (≈ 13 wt.%) but improves its electronic conductivity and electrochemical performance in both aqueous and organic electrolytes. The reversibility and current response are increasing following the trend: LFP/C, LFP/C -3mol%V, LFP/C - 5mol % and LFP/C-10 mol %. The best specific capacity is obtained for the most highly doped olivine, which exhibits a reversible process at 1 mV s-1 in an aqueous electrolyte, thus showing a peak-to-peak distance of 56 mV. The high capacity of LFPC-10V is measured in both LiNO3 and NaNO3 electrolytes amounting to around 100 mAh g-1 at 20 mV s-1. Still, the material is only stable in LiNO3 electrolyte, making it more suitable for Li than Na-ion aqueous rechargeable batteries

CORRELATION AND IMPORTANCE OFSOCIALLY RESPONSIBLE BUSINESSAND ORGANIZATIONAL CULTURE OFCOMPANIES

Pri definiranju strategije poslovanja treba voditi računa o odnosu koje poduzeće ima sa svojim stakeholderima i kakvu sliku stvara o sebi na tržištu. Pojam društvene odgovornosti ili društveno odgovornoga poslovanja definira se preko normi, vrijednosti i ponašanja poduzeća prema internome i eksternom okruženju. Društveno odgovorno poslovanje poduzeća tako pridonosi poboljšanju odnosa s ključnim akterima, te pridonosi dugoročnoj održivosti tvrtke i diferencijaciji iste među uspješnim poduzećima. Rad ukazuje na značajnu svezu između korporativne društvene odgovornosti (CSR) i organizacijske kulture poduzeća. Radom se daje teorijski pregled koncepta društvene odgovornosti poduzeća (CSR), usredotočuje se na značaj organizacijske kulture poduzeća kao bitnoga segmeta kojim se kreira uspješan odnos prema internome i eksternom okruženju. U radu je definiran CSR, kao i njegov značaj te posebne značajke u primjeni u poduzećima. U radu je definiran i objašnjen pojam organizacijske kulture poduzeća, kao i ono što je čini. Također, definirana je i objašnjena sveza između društveno odgovornoga poduzeća i njegove organizacijske kulture. Objašnjeno je koliki je značaj u definiranju pravih sustava vrijednosti i normi u poduzeća, kako za samo poduzeće tako i za sve njegove stakeholdere te, na kraju, za konkurentsku prednost koju poduzeće na taj način ostvaruje. Rad sadrži i praktični dio koji objašnjava svezu između društveno odgovornoga poslovanja i organizacijske kulture tvrtki i to na primjeru Fakulteta za biznis i turizam.When defining a business strategy, companies should take into consideration the relationship that a company has with its stakeholders and what kind of image it creates on the market. The concept of social responsibility or socially responsible business is defining the norms, values, and behaviour of the company according to the internal and external environment. In this way, the socially responsible business of the company contributes to the improvement of relations with the key players, which contributes to the long-term sustainability of the company and the differentiation of the same among successful enterprises. The paper points to the important link between corporate social responsibility and the organizational culture of the company. The paper gives a theoretical overview of the CSR concept, focusing on the importance of the organizational culture of the company as an important segment that creates a successful relationship with the internal and external environment. The paper defines the term CSR as well as its significance and special characteristics in the application in companies. Paper defines and explains the term organizational culture of the company, as well as what the organizational culture of the company makes. Also, a link between the socially responsible companies and the organizational culture has been defined and explained, as well as the importance in defining the right systems of values and norms in companies, both for the company itself and for all its stakeholders, and ultimately for the competitive advantage that the company in this way does. The paper also has a practical part in which is explained the link between social responsibility and the organizational culture of the company on the example of Faculty of Business and Tourism

Inference for bivariate integer-valued moving average models based on binomial thinning operation

Time series of (small) counts are common in practice and appear in a wide variety of fields. In the last three decades, several models that explicitly account for the discreteness of the data have been proposed in the literature. However, for multivariate time series of counts several difficulties arise and the literature is not so detailed. This work considers Bivariate INteger-valued Moving Average, BINMA, models based on the binomial thinning operation. The main probabilistic and statistical properties of BINMA models are studied. Two parametric cases are analysed, one with the cross-correlation generated through a Bivariate Poisson innovation process and another with a Bivariate Negative Binomial innovation process. Moreover, parameter estimation is carried out by the Generalized Method of Moments. The performance of the model is illustrated with synthetic data as well as with real datasets.publishe

Effects of aronia melanocarpa juice on plasma and liver phospholipid fatty acid composition in wistar rats

A nutritional placebo-controlled study was performed in Wistar rats in order to investigate the effects of 5-weeks aronia juice consumption towards fatty acid (FA) composition of phospholipids in the plasma and liver, as well as plasma glucose (Glu) and cholesterol levels. The animals were divided into 3 groups of 8 animals each, and randomized to receive either the full polyphenol dose of Aronia melanocarpa juice (AMJ), 4 times less polyphenol dose (1/4-AMJ) or polyphenol-lacking placebo beverage (PLB). Each group of 8 male adult Wistar rats received the liquid ad libitum. AMJ decreased the levels of low-density lipoprotein (LDL) (P lt 0.05) vs. PLB. AMJ increased dihomo-gamma-linoleic acid (DGLA, 20: 3n-6) (P lt 0.05) and decreased arachidonic acid content (AA, 20: 4n-6) (P lt 0.05) vs. PLB in liver phospholipids. AMJ significantly increased monounsaturated fatty acids (MUFA) levels both in the liver (P lt 0.05) and plasma (P lt 0.05). Both aronia juice doses elevated the levels of beneficial n-3 polyunsaturated fatty acids (PUFA) in the plasma and liver. There was a dose-dependent, significant increase (P lt 0.001) in cis-vaccenic acid (VA, 18: 1n-7) in phospholipids in the plasma and liver. Our results indicate favorable effects of aronia juice intake on lipid parameters in Wistar rats. These findings suggest the potential of aronia dietary intake in cardiometabolic diseases primary prevention strategies in the human population

Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus

In this study, we present surface examination and investigation of the photocatalytic activity of a newly synthesized down-conversion luminescent nanomaterial SrGd2O4 doped with Dy3+ ions. Samples were prepared via glycineassisted combustion method, were formed gel was firstly burned at 500 °C for 1.5 h and then calcined at 1000 °C for 2.5 h. To see the crystallinity and phase purity, Xray diffraction (XRD) measurements were performed and showed that doped sample crystallizes as a single phase with the orthorhombic lattice of SrGd2O4. Luminescent characterization indicated presence of all appropriate emission peaks related to Dy3+ dopant ions. X-ray photoelectron spectroscopy (XPS) was used to investigate surface composition and survey spectra confirmed presence of expected elements (Sr, Gd, O and Dy). Photocatalytic properties of SrGd2O4:Dy were explored in the photocatalytic degradation of organic dye methyl orange (MO) under simulated solar light irradiation. UV/Vis spectrometer was used to measure a decrease in MO concentration in water solutions during the experiment. Aliquots of the working solutions were taken at the exact time intervals, and the results indicate successful dye decomposition rate after 4 h.VI Serbian Ceramic Society Conference : program and the book of abstracts; June 28-29, 2022; Belgrad

Examination of IQOS residue, environmental impact and potential application

IQOS (I-Quit-Ordinary-Smoking) is a brand of heated tobacco. It is an alternative to traditional cigarettes, which involves heating tobacco rather than burning it. IQOS devices heat tobacco sticks, called HEETS or HeatSticks, to a temperature that is high enough to release nicotine and flavor, but not high enough to produce smoke. After consuming IQOS, we treated the remains of HEETS with pyrolysis at 800 degrees. In this way, we have protected the environment from pollution, and in addition, we have obtained carbon material, which further has various applications. The obtained final product was tested using different methods and based on the tested properties, it can be said that the material can potentially be used as an energy fuel, a supercapacitor, for the removal of organic compounds, a drug carrier, etc

Examination of different raw materials, as precursors for obtaining carbon materials

The examination of different raw materials as precursors for obtaining carbon materials is an important area of research due to the wide range of applications for carbon materials in various fields, including energy storage, catalysis, and electronic devices. Some of the commonly studied precursors for carbon materials include biomass, petroleum-based precursors, waste materials, natural materials. The selection of a precursor material depends on various factors, such as the intended application of the carbon material, the availability and cost of the precursor, and the properties of the resulting carbon material. Different precursors can result in carbon materials with varying structures, porosities, and surface chemistries, which can affect their properties and performance in different applications. In our work, we used cherry pits, sour cherry, vineyard peach pits, bean and pea husks. The properties of the initial precursors were tested and then they were treated physically and chemically at different temperatures and times. Correlation of the properties between the initial and final samples was made, as well as their potential application in relation to the obtained properties