OPTIMIZACIJA PROIZVODNJE STRONCIJEVIH SPOJEVA POMOĆU UZORKA CELESTINSKE RUDE

The direct conversion of celestine (SrSO4) to strontium carbonate as well as its enrichment by hydrometallurgy were investigated. A study was also conducted to investigate whether acid concentration affected the quality of strontium sulfate in celestine concentrates. Based on the results of a laboratory assay, it was determined that 98.04% SrSO4 was leached optimally under agitation. The ground sample of celestine concentrate was then leached by agitation for three hours after the dimensional analysis had determined the appropriate grinding time. To determine the optimal approach for the agitated leaching of strontium carbonate, different approaches were tested. Various factors, including temperature, return water, solid percentage, and sodium carbonate to strontium sulfate ratio, were studied. At 90°C, celestine completely converts into strontium carbonate with a solid percentage of 20% and a sodium carbonate to strontium sulfate ratio of 4:5. As part of the investigation into the possibility of producing strontium oxide, samples of celestine concentrate and strontium carbonate produced under optimal conditions were heated at 500 and 1000°C to determine which phase would form the oxidized phase. An X-ray analysis indicates that the oxidation phase forms at a temperature of more than 750°C.U radu se istražuje izravna pretvorba celestina (SrSO4) u stroncijev karbonat i njegovo obogaćivanje hidrometalurgijskim postupcima. Također, provedeno je istraživanje o utjecaju koncentracije kiseline na kvalitetu stroncijeva sulfata u koncentratima celestina. Na temelju rezultata laboratorijskih ispitivanja utvrđeno je da se 98,04 % SrSO4 optimalno izlužuje uz miješanje. Nakon što je dimenzijskom analizom određeno odgovarajuće vrijeme mljevenja, samljeveni uzorak koncentrata celestina izlužen je protresanjem tijekom tri sata. Testirani su različiti pristupi kako bi se odredio optimalan postupak za izluživanje uz protresanje stroncijeva karbonata. Proučavani su različiti čimbenici, uključujući temperaturu, povratnu vodu, postotak čvrste tvari i omjer natrijeva karbonata i stroncijeva sulfata. Na 90 °C celestin se potpuno pretvara u stroncijev karbonat s 20 % udjela čvrste tvari i omjerom natrijeva karbonata i stroncijeva sulfata od 4 : 5. Kako bi se utvrdilo koja će faza tvoriti oksidiranu fazu u sklopu istraživanja mogućnosti proizvodnje stroncijeva oksida, uzorci koncentrata celestina i stroncijeva karbonata načinjeni su u optimalnim uvjetima zagrijavanjem na 500 i 1000 °C. Rendgenska analiza pokazuje da se oksidacijska faza formira na temperaturi višoj od 750 °C

Electrochemical determination of ciprofloxacin using glassy carbon electrode modified with CoFe2o4-MWCNT

CoFe2O4 nanostructures composed of spherical-like were obtained by sol-gel method with glucose as template and combine with MWCNT and composed CoFe2O4-MWCNT heterostructure. The crystal Structure, phase composition, morphology and magnetic properties of CoFe2O4/MWCNT heterostructure were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometers (VSM), A pure phase of well crystallized CoFe2O4 nanostructures, with average size of 60 nm, could be readily synthesized at present glucose. The modified glassy carbon (GC) electrode with CoFe2O4-MWCNT heterostructure was used to determine the ciprofloxacin concentration. A cyclic voltammetric technique was used for comparison between the unmodified and modified electrodes. The fabricated modified electrode shows linear response for detection of ciprofloxacin at two linear range of 0.1-1 µM and 1-30 µM with a detection limit of 0.036 µM. © 2019 by CEE (Center of Excellence in Electrochemistry)

Selective precipitation of iron from multi-element PLS produced by atmospheric leaching of Ni-Co bearing laterite

Laterites are the main resources of oxidized nickel in the world. Nickel and cobalt are embedded in limonite laterites within the goethite structure. Therefore, the removal of iron ions will lead to the simultaneous precipitation of iron, nickel, and cobalt. In our previous study investigating atmospheric leaching of laterite ore using sulfuric acid with the addition of NaCl to the solution, we determined the optimal parameters to minimize the co-dissolution of iron. Based on the determined optimum conditions, a PLS was prepared. In the current study, the effect of pH on iron precipitation from the PLS was investigated using sodium hydroxide as a neutralizing agent. Results indicated that a pH=4 can result in the highest removal of iron from the leaching solution (around 90%) while minimizing the loss of nickel and cobalt. The SEM analysis revealed ferrihydrite as the most important mineral in the final precipitation obtained at pH=4. The results of this study can be used for benchmarking more efficient methods for iron removal from the solution and improving the dissolution kinetics of nickel and cobalt

Effect of Emotion Regulation Training on Aggression, Rumination, and Self-control in Female Junior High School Students with Low Academic Performance

Background: Theoretical and empirical evidence indicates that emotions primarily influence students’ behavior during adolescence. This study aimed to determine the effect of emotion regulation training on aggression, rumination, and self-control in female students with low academic performance.Methods: This study was quasi-experimental with a pre-test-post-test design and a control group. The statistical population included all female students with low academic performance in a junior high school in Tabriz, Iran during the first semester of the 2021-2022 academic year. Among them, 50 students were selected as the research sample by randomized cluster method and randomly assigned to experimental and control groups through the random coin toss method. The data were collected by Tangney ‘s self-control scale (SCS), Boss & Perry’s aggression questionnaire (AGQ), and Nolen-Hoeksema & Marrrow’s mental rumination scale (RRS). An emotion regulation training package was performed for the experimental group. The control group received no intervention. The data were analyzed by paired t-test and one-way analysis of variance (ANOVA) using SPSS version 27.Results: After applying the intervention, the mean scores of variables were 45.40±8.10, 40.52±10.79, and 74.52±9.87 in the experimental group and 40.48±6.11, 48.56±11.58, and 88.2±10.74 in the control group, respectively. Hence, emotion regulation training was effective in reducing aggression (P=0.001) and mental rumination (P=0.014) and increasing self-control (P=0.019).Conclusions: This study proved that emotion regulation training could effectively decrease aggression and mental rumination and increase self-control in students with low academic performance

MINERAL CHEMISTRY AND GEOCHEMISTRY OF GRANITOID ROCKS IN NORTHERN OF SARDUIEH (DASHT SHAGHIN AND SARTASHTAK), IRAN

Dehaj-Sarduieh volcano-plutonic belt in Kerman province of Iran represents a part of Urumieh-Dokhtar Magmatic assemblage which is mainly composed of granodiorite, quartz diorite, tonalite granite and granophyre. These rocks emplaced in Eocene volcanic and pyroclastic deposits rocks and are considered to be Oligo-Miocene in age. Geochemical studies showed that the amphibole minerals in diorite and granodiorites are calcic in composition and range from actinolite to magnesio-hornblende. Geochemical and mineralogical results revealed that these bodies have been generated in the lower part of the lower crust at a temperature of 700 to 750 °C, with an oxygen fugacity of -13.57 to -15.76 and a low pressure of 1 to 3 kb through mixing of mantle-derived mafic magma with crustal-derived felsic melts. These amphiboles are subduction-related and in accordance with the tectono-magmatic features suggested for these massifs, they show the characteristics of subduction and active continental margin environments. Field observations and mineralogical-geochemical evidence revealed that the original magma has been calc-alkaline in composition and metaluminous I-type. It is also showed that the process of fractional crystallization has significantly contributed in the formation of these rocks. Sarduieh igneous rocks displayed an enrichment in the large-ion lithophile elements (LILE, e.g. Ce, Th, Ba, Zr, Sr) and a depletion of the high field strength elements (HFSE, e.g. Nb, P, and Ti) and Chondrite normalized REE patterns are characterized by LREE enrichment and Show slight negative Eu anomalies which reflect the influence of subductions zone and active continental margin environments. The tectonic setting of these rocks is inferred to be continental arc or active continental margin and they were deduced to be generated by the subduction of the Neotethys oceanic crust beneath the Central Iranian continental plate.O cinturão vulcânico-plutônico de Dehaj-Sarduieh, na província de Kerman, no Irã, representa uma parte do conjunto Urumieh-Dokhtar Magmatic, composto principalmente de granodiorito, diorito de quartzo, granito e granito. Essas rochas localizadas em depósitos vulcânicos e piroclásticos do Eoceno e são consideradas como idade do Oligo-Mioceno. Estudos geoquímicos mostraram que os minerais anfibólio nos dioritos e granodioritos são de composição cálica e variam de actinolita a magnésio-hornblenda.Resultados geoquímicos e mineralógicos revelaram que esses corpos foram gerados na parte inferior da crosta inferior a uma temperatura de 700 a 750 ° C, com uma fugacidade de oxigênio de -13,57 a -15,76 e baixa pressão de 1 a 3 kb através da mistura de magma máfico derivado do manto com derretidos félsicos derivados da crosta. Esses anfibólios estão relacionados à subducção e, de acordo com as características tectono-magmáticas sugeridas para esses maciços, mostram as características dos ambientes de subducção e margem continental ativa. As observações de campo e as evidências mineralógico-geoquímicas revelaram que o magma original tem composição alcalino-calcária e tipo I metaluminoso. Também é mostrado que o processo de cristalização fracionada contribuiu significativamente na formação dessas rochas. As rochas ígneas de Sarduieh exibiram um enriquecimento nos elementos litófilos de íons grandes (LILE, por exemplo, Ce, Th, Ba, Zr, Sr) e um esgotamento dos elementos de alta força de campo (HFSE, por exemplo, Nb, P e Ti) e Condrita normalizados Os padrões REE são caracterizados pelo enriquecimento LREE e Mostrar pequenas anomalias negativas da Eu que refletem a influência da zona de subducção e ambientes ativos de margens continentais. O cenário tectônico dessas rochas é inferido como arco continental ou margem continental ativa e elas foram deduzidas para serem geradas pela subducção da crosta oceânica de Neotethys sob a placa continental iraniana central

The Relationship Between Dark and Light Dimensions of Personality with Life Satisfaction Mediated by Value Orientations

Different studies have examined the relationship between dark and light personality dimensions and life satisfaction. Using the structural equation method, this correlational descriptive study aimed to determine the relationship between dark and light dimensions of personality with life satisfaction as mediated by value orientations. To this end, 400 people who referred to health centers in Tabriz, Iran were selected through convenience sampling method. To collect data, Life Satisfaction Questionnaire, Dark Triad Personality Questionnaire, Light Triad Personality Questionnaire, and the Value System Questionnaire were used. Then the data were analyzed using the structural equation method. While the dark dimensions had a negative effect on life satisfaction, the light dimensions had a positive effect. There was a negative relationship between dark dimensions and life satisfaction as mediated by value orientations. Meanwhile, there was a positive relationship between light dimensions and life satisfaction as mediated by value orientations. Therefore, the dark and light dimensions of personality and the way of value orientation are related to the level of life satisfaction. Accordingly, researchers can examine the effectiveness of these variables on life satisfaction through developing psychotherapy interventions influencing the variables of dark and light dimensions of personality and value orientation.  Introduction*Various personality variables affect the level of life satisfaction. The dark dimensions, including antisocial, narcissism, and Machiavellianism, have a direct role in people's attitudes towards life (Paulhus ­­­&Williams, 2002). Various studies have shown the negative relationship between dark personality traits and life satisfaction (Marashi et al., 2017; Sharifinia & Harun Rashidi, 2020). The light dimensions, including three dimensions of humanity, faith in humanity, and Kantianism (Kaufman et al., 2019) along with the way of value orientation have a positive relationship with life satisfaction (Sadeghi et al., 2018). While people with light personality traits use developed defense mechanisms (Wood et al., 2010) leading to life satisfaction, people with dark personality traits choose anti-moral values ‌‌in life (Oboyle et al., 2012) which result in dissatisfaction with life. Considering the essential role of personality traits and the type of value orientation in the level of life satisfaction, this study aimed to investigate the relationship between the dark and light dimensions of personality with life satisfaction mediated by value orientation. MethodThis descriptive correlational research used structural equation method. Using the available sampling method, a total of 400 individuals referring to the health centers in Tabriz, Iran were selected. The following four questionnaires were completed by participants.Life Satisfaction Questionnaire: This five-item scale was developed by Diener et al. (1985). A higher score indicates more satisfaction with life. Diener et al. obtained the reliability of this scale with Cronbach's alpha method (0.86). In the present study, Cronbach's alpha obtained for this scale was 0.78. Dark Triads Personality Questionnaire: This 12-item scale was designed by Johnson and Webster (2010) and includes three subscales: Machiavellianism, antisociality, and narcissism. Johnson and Webster reported the test-retest reliability coefficient of this questionnaire as 0.89 for the entire scale. In the present study, Cronbach's alphas obtained for Machiavellian, antisocial, and narcissistic subscales were 0.79, 0.69, and 0.73, respectively. Light Triads Personality Questionnaire: This scale was designed by Kaufman et al. (2019) and consists of three subscales: Kantianism, humanity, and faith in humanity. The internal reliability coefficient for this scale was estimated as 0.84 in the original study (Kaufman et al., 2019). In our study, Cronbach's alphas obtained for the variables of Kantianism, humanity, and faith in humanity were 0.69, 0.72, and 0.68, respectively. The Value System Questionnaire: This scale was developed by Schwartz (2006) and consists of 57 questions and ten scales of the value system. The Cronbach's alphas reported by Schwartz for the subscales of benevolence, traditionalism, conformity, security, power, arousal, hedonism, success, spontaneity, and cosmopolitanism were 0.61, 0.37, 0.48, 0.64, 0.50, 0.69, 0.79, 0.52, 0.53, 0.57, respectively. In the present study, the alpha obtained for each of the subscales was estimated to be more than 0.67. ResultsWhile the dark dimensions had a negative effect on life satisfaction, the light dimensions had a positive effect. There was a significant relationship between the dark and light dimensions with life satisfaction as mediated by value orientations. Table 1 shows the Pearson’s correlation matrix for the studied variables.  Table 1. Pearson’s Correlation Matrix for The Relationships between Research Variables4321Variables   11- Dark dimensions    1-0/61**2- Light dimensions   10/56**-0/58**3- Value orientation10/62**0/69**-0/64**4- Life satisfactionP<.01 According to Table 1, there was a significant negative relationship between the dark dimensions with light dimensions, value orientation, and life satisfaction. There was a significant positive relationship between the light dimensions with value orientations and life satisfaction. Also, there was a significant positive relationship between value orientations and life satisfaction.   .83                                                                                                                                .68                        .58               Figure 1. Structural Model of Dark and Light Dimensions Mediated by Value Orientation on Life Satisfaction To investigate the indirect relationship between the dark and light dimensions with life satisfaction as mediated by value orientations, the bootstrap method was used (Table 2).  Table 2. Bootstrap Results for Indirect Model RelationshipspUpper limitLower limitStandardized estimatorVariables 0/006 -0/027 - 0/200 -0/097The relationship between dark dimensions with life satisfaction mediated by value orientations0/0040/1940/0220/092The relationship between light dimensions with life satisfaction mediated by value orientations       P<0.05 The bootstrapping test results showed that dark dimensions had a negative indirect effect on life satisfaction mediated by value orientations (= -0.097); Also, light personality dimensions had a positive indirect effect on life satisfaction mediated by value orientations (= 0.092).ConclusionThis study investigated the relationship between the dark and light dimensions with life satisfaction through the mediating role of value orientation. According to the results, while the dark dimensions had a negative effect on life satisfaction, the light dimensions had a positive effect on it.  According to psychological theories, life satisfaction is widely influenced by a person's developmental background such as personality traits. Dark personality traits show the tendency to experience more unpleasant emotional states such as anger, sadness, despair, and other negative emotions. These people perceive life stressful and are dissatisfied with their social support, which can explain lower levels of life satisfaction. People with clear personality traits have extensive verbal and communication skills, which facilitates relationships with others, provides them with more social support, and increases life satisfaction.In our study, there was a relationship between the dark and light dimensions of personality with life satisfaction mediated by value orientations. People who have light personality dimensions experience more life satisfaction through choosing positive defense mechanisms, realistic views, and moral value orientations in life. People with dark personality dimensions adopt an anti-moral value orientation, which ultimately causes dissatisfaction with life. Accordingly, psychologists and counselors should pay more attention to the role of personality variables and value orientations in the beginning and continuation of psychological interventions in primary prevention programs and interventional and clinical work.Ethical ConsiderationCompliance with Ethical Guidelines: This research has the code of ethics IR.IAU.TABRIZ.REC.1400089 from the ethics committee of the research vice-chancellor of Islamic Azad University, Tabriz Branch.Authors’ Contributions: All authors contributed to the study. The first author written the first draft of the manuscript. The second author edited the manuscript. The third author advised result sections. The fourth author written the methods sections.Conflict of Interest: The authors declare no conflict of interest for this study.Funding: This study was conducted with no financial support.Acknowledgment: The authors thank all participants in the study.     *. Corresponding autho