Крајем 2021. године објављена је студија Ђорђа Деспића о критичко-есејистичком опусу великог српског песника, есејисте, критичара и антологичара Миодрага Павловића (1928–2014) под називом Тумач и ...песма: есејистика Миодрага Павловића, која представља незнатно измењену докторску дисертацију проф. Деспића одбрањену 2013. Ова студија је у октобру 2022. године овенчана и наградом „Ђорђе Јовановић“ за најбољу монографску студију објављену у претходној години, те се може рећи да та чињеница особито препоручује посвећивање пажње овој студији. Овим делод Деспић наставља проучавање различитих аспеката стваралаштва Миодрага Павловића, започетог књигом Порекло песме (Агора, 2008) о потенцијалима интертекстуалности у поезији овог песника, што је представљало јединствену такву студију у дотадашњој српској науци о књижевности.
Annual production of the sunflower seed in Serbia is between 650,000-720,000
tons. Most of this amount is used in vegetable oil industry. Abundant
by-products from this processing are sunflower seed ...husks. Husks are usually
incinerated by vegetable oil producers in order to obtain energy, used as an
animal feed, or, unfortunately, landed up at some landfills. In order to
promote new, added value for this abundant, renewable resource, the
investigation presented in this paper was conducted. For that purpose,
adsorption of Cu(II) ions from synthetic solution by unmodified sunflower
seed husks was examined. ATR-FTIR was used to identify functional groups as
potential active sites for Cu(II) sorption. Zeta potential values were
determined to reveal the surface charge, while the cation exchange capacity
(CEC) was determined to reveal the amount of exchangeable ions on its
surface. ATR-FTIR analysis revealed the presence of specific functional
groups (hydroxyl, carboxyl, carbonyl, and amine) responsible for removal of
Cu(II) ions. The total CEC of sunflower husk is 47.74 meq/100g and Ca(II)
and Mg(II) ions are in dominant exchangeable positions. The study of
ion-exchange mechanism involvement was done and results confirmed that this
mechanism is not the only mechanism which is involved in copper sorption.
Also, the results show that the Cu(II) ions have preference for Mg(II) ions
substitution. Sorption experiments were conducted in batch system. The
effect of operating parameters (pH, contact time, initial concentration of
Cu(II) ions and adsorbent dosage) on the adsorption capacity were
investigated. The obtained experimental data were fitted by Langmuir and
Freundlich isotherm models. The maximum adsorption capacity for Cu(II) ions
calculated from Langmuir adsorption isotherm was 34.89 mg/g which is 15 to
35% higher than the capacity that other researchers reported previously for
the same material and pollutant. These results are suggesting that sunflower
seed husks have a potential to be applied as an effective adsorbent of
copper ions from contaminated waters.
The purpose of this paper was to investigate the effectiveness of three
different extraction agents for the extraction of 25 elements from sediment
samples collected from 4 artificial lakes and 12 ...rivers in Serbia (33
samples in total). The extraction efficiency of the agents was evaluated by
its ability to extract the highest quantity of the elements. For that
purpose, three acids (1M HCl, 2M HNO3 and 0.43M CH3COOH) have been used.
Inductively coupled plasma atomic emission spectrometry (ICP-OES) was used
for quantitative determination of following elements: Al, As, B, Ba, Be, Bi,
Ca, Cd, Cr, Co, Cu, Fe, Hg, K, Li, Mg, Mn, Ni, Na, Pb, Sb, Se, Sr, V, and
Zn. The extraction with 1M HCl has shown the best results for the majority
of investigated elements (especially Sr, Mn and Ca). Antimony (Sb) was
detected only after extraction with 0.43M CH3COOOH, while selenium (Se)
could not be detected when 2M HNO3 was applied as extraction agents. The
present study could be very useful for choosing a suitable method for
specific elements and also can be helpful in the evaluation of the
contaminants in freshwater sediments in Serbia. This might contribute to
environmental risk assessment of the present elements.
The paper illuminates some of the principles by which Helmut Newton's photographic poetics functions. It is examined from the perspectives of recent art history, feminist critique and psychoanalytic ...theory. His photographs came to a standstill not far from pornography, yet they stayed within the jet-set community, reflecting at the same time the sexual revolution in the 60s and 70s of the twentieth century and the rising of the fashion and film industries and other Western emancipatory movements. Newton's obscure photojournalism provoked conventions, presenting the female body as a fetish and object of erotic pleasure, affirming, nonetheless, a new feminine self-consciousness and freedom. Thus, he constituted modern eroticism by connecting fetishism, voyeurism and sadomasochism, creating a provocative hybrid photography that embraced fashion, eroticism and portrait, hence documenting, in highly stylistic manner, the decadency and eccentricity of the lifestyle of the rich.
At the end of 2021, Đorđe Despić's study on the critical and essayistic oeuvre of the great Serbian poet, essayist, critic, and anthologist Miodrag Pavlović (1928–2014) was published under the title ...The Interpreter and Poem: Essays by Miodrag Pavlović, which is a slightly modified doctoral dissertation of prof. Despića defended in 2013. In October 2022, this study was also crowned with the "Đorđe Jovanović" award for the best monographic study published in the previous year. This fact recommends particularly paying attention to this study. With this work, Despić continues the study of various aspects of the creativity of Miodrag Pavlović, which began with the book Poreklo pesme (Agora, 2008) about the potential of intertextuality in the poetry of this poet, which represented a unique study of this kind in Serbian literary science.
The study is focused on the determination of the most effective chemical leaching process for the simultaneous demineralization/deashing and desulfurization of subbituminous coal from the Bogovina ...Basin. Coal was treated for 30 min, at different temperatures, using variable concentrations of hydrochloric, nitric, acetic and citric acids; hydrogen peroxide, mixture of hydrogen peroxide and nitric acid (pH 2), as well as by the stepwise leaching process (nitric acid + mixture of hydrogen peroxide and nitric acid, pH 2). The changes in mineral composition, caused by the chemical leaching, are followed using X-ray diffraction, whereas alterations of coal organic matter are tracked by Fourier-transform infrared spectroscopy and the content of fixed carbon. Inorganic acid leaching, regardless of the temperature and acid concentration, enabled the successful deashing of coal, whereas the percent of desulfurization was insufficient. The organic acid leaching was not satisfactory for both, deashing and desulfurization. Leaching by H2O2 and H2O2/HNO3 mixture (pH 2) resulted in moderate desulfurization, but the ash reduction was low. The most suitable method for the simultaneous effective ash (78 wt.%) and the sulfur (66 wt. %) removal from Bogovina coal is the two-step leaching, combining 10 vol. % HNO3 and mixture of 35 vol. % H2O2/10 vol. % HNO3 of pH 2 at 60?C.
This paper's introduction aims to synthesise the basic theoretical assumptions regarding the representation of the masculinities and femininities in the prose work of Franz Kafka, which will be ...applied in the analysis of his story The Metamorphosis (1915). This topic in Kafka's work is particularly complex because the author combines different types of masculinities. Therefore his male protagonists (Gregor Samsa and his father) are not consistently dominant, i.e. weak, but the roles rotate and replace one another. Similar is the case with the female gender identities. Gregor’s sister, Greta, also undergoes a metamorphosis in the sense of position of power. The caring, loving sister transforms into a she-tyrant and a carrier of the traditional masculine traits. Ironically, she blossoms into a grown woman while her brother deteriorates – both physically and ontologically – and especially after his death. In that sense, Gregor's physical metamorphosis serves as a catalyst in the gender role rotation, predominantly in the brother-sister relation.
During mechanical activation, energy of treated material is increase to a higher level. This can lead to chemical transformation of the activated material. This is the point where we can talk about ...mechanochemical transformations that have occurred as a result of mechanical activation. The subject of this paper is to monitor mass changes of material after different degrees of activation. One of the substances which is often used in the processes of mechanochemical synthesis is sodium carbonate. The mass changes occurring during the treatment were detected and measured by various methods, depending on the processing environment. The mass increase was attributed to chemisorption of moisture and carbon-dioxide present in air, as a consequence of the sodium carbonate activation. The methods we used were calcimetric chemical analysis. According to obtained results, it was found that activated sodium carbonate is mass-transformed into sodium bicarbonate, whereby these changes are functionally dependent on activation time and the processing atmosphere.
The results of polymetallic sulphide Cu-Zn-Pb concentrate leaching with sulphuric acid in the presence of sodium nitrate as an oxidizing agent, at atmospheric pressure, are presented and discussed. ...Chemical composition and phase ratio of the starting concentrate and solid residuals after the leaching process are shown. Chemical reactions of leaching and their thermodynamic probabilities are predicted based on the calculated Gibbs energies and analysis of E-pH diagrams. The influence of temperature and time on the leaching degree of the concentrate's components is experimentally determined. It is shown that it is possible to obtain copper, zinc and iron in a solute form, while lead in the anglesite (PbSO4) form remains in the solid residual after the leaching process. The iron is being oxidized to Fe(III)-sulphate, which takes part in a sulphide leached minerals and turns into Fe(II)-sulphate.
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