In Serbia, primary education is compulsory, and it lasts eight years with two educational cycles, while in the Czech Republic, primary education lasts nine years with three cycles. Analysis of the teachers` attitudes toward primary education in Serbia and the Czech Republic has a goal to determine the current educational state in the two countries. Also, in this research it has been shown if there are similarities, as well as differences between the two educational systems. Views of the teachers on this topic are significant for this paper, so the survey was used as an instrument. The survey should have revealed whether the primary education was in line with the need of modernization and enhancement of young peple’s intellectual potential. It was necessary to reveal if the education in the two countries is in accordance with the modern world and whether the teachers agree with this. One of the aims of the research was to determine whether there are statistically significant differences in the teachers’ answers and to relate those differences to the general educational situation in Serbia and Czechia.

Objective: During the COVID-19 pandemic, fear, anxiety, and depression have become global concerns among the wider public. This study aimed to examine the occurrence of fear, anxiety and depressive symptoms associated with COVID-19, to assess influencing factors that lead to the development of these mental health conditions and to examine any changes in the mental health patterns of the society since the initial study a year ago in Sarajevo, Bosnia and Herzegovina. Method : An anonymous online survey based on Fear of COVID-19 Scale (FCV-19S), General Anxiety Disorder-7 (GAD-7) and Patients Health Questionnaires (PHQs) was conducted in the general population of Sarajevo in Bosnia and Herzegovina. Results: From 1096 subjects, 81.3% were females, 33.8% had a high school degree, 56.4% were married, 53.4% were engaged in intellectual labor, 42.3% experienced fear, 72.9% had anxiety symptoms and 70.3% had depressive symptoms during the COVID-19 pandemic and their mean age was 35.84 ± 10.86. Half (50.1%) of the subjects were COVID-19 positive and 63.8% had COVID-19 symptoms when responding to the questionnaire. Experiencing COVID-19 related fear (OR = 1.972) and having moderate to severe depressive symptoms (OR = 9.514) were associated with the development of mild to severe anxiety symptoms during the COVID-19 pandemic, which were in turn associated with the development of moderate to severe depressive symptoms (OR = 10.203) and COVID-19 related fear (OR = 2.140), respectively, thus creating a potential circulus vicious. COVID-19 positive subjects (OR = 1.454) were also more likely to develop mild to severe anxiety symptoms during the COVID-19 pandemic. Conclusion: In conclusion, the prevalence of fear, anxiety symptoms and depressive symptoms rose dramatically since the beginning of the COVID-19 pandemic in Bosnia and Herzegovina. They were interconnected and were significantly associated with age, gender, marital status and COVID-19 status. Therefore, an urgent mental health intervention is needed for the prevention of mental health problems.

The concept of radicalization is very actual and presents an attempt to gain a deeper understanding of the contemporary terrorism. Our knowledge of the factors that lead to radicalization and shape the mind of  the prospective terrorists is an important analytical tool for practical policy in terms of proactive work and development of strategies for terrorism prevention. The problem arises in the attempt of its conceptual determination of the radicalization and violent extremism. The concept of  radicalization is focused on the individual and, to a certain extent, on ideology and the group, while structural factors and efforts to address the causes of the phenomenon remain outside the epistemological range. In this paper author(s) use case study method as an empirical study of the social phenomenon of radicalism, extremism and violent extremism leading to terrorism and its impact on the subcultural behaviors of radical communities, the security situation where the boundary between the real phenomenon and the real life context are explored. In this paper, case study resewargh method will brighten radical and extremist movements that are deeply rooted in Bosnian society, their connection with the countries of the region and the processing of empirical data on various forms of discrimination and Islamophobia will be discussed. The problem of this research is the impact of radicalism and extremism on the security situation in Bosnia and Herzegovina and the current security position of  Bosnia and Herzegovina vis-à-vis its neighbors with social focus and the importance of the restructuring a conceptualization of radicalism, extremism and violent extremism leading to terrorism, destruction, human casualties and high media coverage of such acts. Period of terrosim implicatication on Bosnia covering 2010-2020. Results will precise essential weakness of the concept(s) of prevention in fight against violent etremism in addition to other methodological uncertainties addressed in this paper. The paper seeks to examine the leading positions in scientifc literature and critically review the epistemological and practical value of the concept of radicalization that leads to terrorism. From theoretical  perspective this concept lacks solid grounding base and should be subject of critical rethinking. The establishment of effective mechanisms for deradicalization is one of the vital programs that Bosnia and Herzegovina will have to recognize and implement, especially through work with young people, which will involve various social actors, all in order to spread tolerance and equality in order to achieve greater degree in the creation of a free democratic society.

Introduction: Composite materials may be exposed to chemicals in food and beverages in the oral cavity, which can lead to changes in surface roughness. The aim of this in vitro study was to evaluate the surface roughness of two restorative materials after exposure to coffee and green tea followed by a dental bleaching procedure. Methods: For nanofilled composite and microhybrid composite, 15 samples each were fabricated. Five specimens from each composite were stored in instant coffee and green tea for 4 h a day. After 30 days of immersion, specimens received dental at-home bleaching, using 16% carbamide peroxide (CP), for 7 h a day. The control group was stored in deionized water for 30 days. Surface roughness was determined by profilometry 24 h after polymerization, after 30 days of immersion, and after bleaching. The data were analyzed using a t-test for paired samples and mixed analysis of variance, at a 0.05 significance level. Results: Neither beverages nor CP treatment significantly altered the surface roughness of the composites. There was no difference between the tested composite materials regarding roughness. Conclusion: Surface roughness of the microhybrid and nanohybrid composites was not modified by coffee, green tea, and subsequent whitening treatment.

Objective: To compare organ involvement and disease severity between male and female patients with juvenile onset systemic sclerosis. Methods: Demographics, organ involvement, laboratory evaluation, patient-reported outcomes and physician assessment variables were compared between male and female juvenile onset systemic sclerosis patients enrolled in the prospective international juvenile systemic sclerosis cohort at their baseline visit and after 12 months. Results: One hundred and seventy-five juvenile onset systemic sclerosis patients were evaluated, 142 females and 33 males. Race, age of onset, disease duration, and disease subtypes (70% diffuse cutaneous) were similar between males and females. Active digital ulceration, very low body mass index, and tendon friction rubs were significantly more frequent in males. Physician global assessment of disease severity and digital ulcer activity was significantly higher in males. Composite pulmonary involvement was also more frequent in males, though not statistically significantly. After 12 months, they are the pattern of differences changed female patients had significantly more frequent pulmonary involvement. Conclusion: In this cohort, juvenile onset systemic sclerosis had a more severe course in males at baseline and but the pattern changed after 12 months. Some differences from adult findings persisted, there is no increased signal of pulmonary arterial hypertension or heart failure in male pediatric patients. While monitoring protocols of organ involvement in juvenile onset systemic sclerosis need to be identical for males and females.

For a manifold $M$ and an integer $r>1$, the space of $r$-immersions of $M$ in $\mathbb {R}^n$ is defined to be the space of immersions of $M$ in $\mathbb {R}^n$ such that the preimage of every point in $\mathbb {R}^n$ contains fewer than $r$ points. We consider the space of $r$-immersions when $M$ is a disjoint union of $k$ $m$-dimensional discs, and prove that it is equivalent to the product of the $r$-configuration space of $k$ points in $\mathbb {R}^n$ and the $k^{\text {th}}$ power of the space of injective linear maps from $\mathbb {R}^m$ to $\mathbb {R}^n$. This result is needed in order to apply Michael Weiss's manifold calculus to the study of $r$-immersions. The analogous statement for spaces of embeddings is “well-known”, but a detailed proof is hard to find in the literature, and the existing proofs seem to use the isotopy extension theorem, if only as a matter of convenience. Isotopy extension does not hold for $r$-immersions, so we spell out the details of a proof that avoids using it, and applies to spaces of $r$-immersions.

For a manifold $M$ and an integer $r>1$, the space of $r$-immersions of $M$ in $\mathbb {R}^n$ is defined to be the space of immersions of $M$ in $\mathbb {R}^n$ such that the preimage of every point in $\mathbb {R}^n$ contains fewer than $r$ points. We consider the space of $r$-immersions when $M$ is a disjoint union of $k$ $m$-dimensional discs, and prove that it is equivalent to the product of the $r$-configuration space of $k$ points in $\mathbb {R}^n$ and the $k^{\text {th}}$ power of the space of injective linear maps from $\mathbb {R}^m$ to $\mathbb {R}^n$. This result is needed in order to apply Michael Weiss's manifold calculus to the study of $r$-immersions. The analogous statement for spaces of embeddings is “well-known”, but a detailed proof is hard to find in the literature, and the existing proofs seem to use the isotopy extension theorem, if only as a matter of convenience. Isotopy extension does not hold for $r$-immersions, so we spell out the details of a proof that avoids using it, and applies to spaces of $r$-immersions.

Abstract Aim: The study aimed to evaluate the acute effect of ultrafiltration on the mechanical properties of the aorta using brachial-ankle pulse wave velocity (PWV) before and after hemodialysis (HD). Patients and Methods: This study included 80 patients who were on a long-term HD program. The input variables were anamnestic data, body composition monitor (BCM) parameters, and echocardiography findings. The assessment of hydration status was determined by BCM, whose work is based on the principle of multifrequency bioimpedance spectroscopy. Another diagnostic procedure was the use of an arteriograph apparatus to assess PWV and Augmentation Index (AIx). All measurements were performed before and after dialysis on the middle dialysis day of the week. Results: The participants were divided into two groups based on hydration status: the experimental group consisted of 40 overhydrated participants and the control group consisted of 40 normovolemic participants. Statistically, the following BCM parameters correlated significantly positively with PWV: total body fat (r = 0.222; P < 0.05), overhydration (r = 0.290; P < 0.001), and relative overhydration (r = 0.290; P < 0.001). From echocardiography findings, only left atrial diameter correlated statistically significantly positively with PWV (r = 0.359; P < 0.001). Comparison of the mean PWV values within the experimental group before and after HD showed a statistically significant decrease from 14.32 ± 2.34 m/s to 8.72 ± 1.52 m/s (Z = 3.254; P = 0.0001). Mean PWV values within the control group did not decrease significantly from 13.39 ± 1.32 m/s to 10.39 ± 1.18 m/s (Z = 0.524; P = 0.742). If we compare the mean values of PWV between groups, then before HD treatment, there was no statistically significant difference between groups with PWV values in the experimental group of 14.32 ± 2.34 m/s and the control group of 13.39 ± 1.32 m/s (Z = 0.762; P = 0.852). According to the results of univariate regression analysis before and after HD treatment, only overhydration showed an absolute effect on PWV before and after HD. Conclusion: Overhydration showed an effect on brachial-ankle PWV before and after HD, and brachial-ankle PWV should be followed in HD patients.

Introduction: Fetal central nervous system (CNS) anomalies are among the most severe and common anomalies, with an incidence of 1: 100 to 1: 500 in newborns. Depending on the type of anomaly, the diagnosis can only be made at specifi c periods of pregnancy. The prenatal ultrasound (US) is an eff ective primary imaging modality for depicting these anomalies, and magnetic resonance imaging (MRI) is a method that provides useful confi rmation and resolves any doubts regarding the diagnosis made on prenatal ultrasound. In situations where ultrasound examination is diffi cult, fetal MRI can provide superior information owing to its many advantages. The aim of this study was to determine the importance of prenatal MRI in making an accurate diagnosis and assessment of fetal CNS anomalies after neurosonographic doubt and in detecting additional anomalies that might have been overlooked on ultrasound, which infl uences clinical decision making and anomaly outcomes. Material and methods: For this research, which was designed as a systematic review of the primary scientifi c research literature, numerous articles were used, i.e.17 scientifi c research papers, published in relevant scientifi c research online databases such as PubMed, Medline, Google Scholar, and the same were published in English in the period from 2015 to 2021. Results: From the assessment of the quality of studies with a cohort design, most studies used in this systematic review are high-quality studies (11 in total) and a smaller number are medium-quality studies (6 in total). Out of 575 cases, MRI confi rmed the ultrasound diagnosis and agreed with it in 59.8% of cases, while in 20.2% of cases, it changed the diagnosis, i.e., in 16.5%, it rejected the ultrasound diagnosis. Additional anomalies detected only on MRI occurred in 236/1225 cases, which totals 19.3% of additional anomalies. Termination of pregnancy was reported in 82/317 cases, accounting for 25.9%, while in 176 cases, the pregnancy continued. A total of 11 cases of neonatal death were reported, and the number of stillbirths or deaths after birth was reported in 8 cases. Conclusion: MRI using T2W SSFSE sequences in 3 planes, T1W and DWI in the axial plane, is a complementary modality to prenatal ultrasound in making an accurate diagnosis and assessment of CNS anomalies and detecting associated anomalies previously overlooked on ultrasound. Keywords: fetal magnetic resonance imaging, fetal neurosonography, fetal central nervous system anomalies, prenatal diagnosis.

Invasive plant species are foreign species that usually have a negative impact to the native flora and vegetation, human health, or that cause damage to agriculture and the economy. Therefore, the spread of invasive species is one of the biggest problems in nature protection. The aim of the work is to determine the invasive plant species in the wider area of the city of Lukavac, to analyze the life forms and the geographical origin. The research was done during the summer months of 2021. This paper presents the results of research on invasive plant species in the wider area of the town of Lukavac, which is located in the northeastern part of Bosnia and Herzegovina and administratively belongs to the Federation of Bosnia and Herzegovina and the Tuzla Canton. Total 12 invasive species from 8 families and 12 genera were recorded. The largest number of species belongs to the Asteraceae family, while the other families are represented by one species. Among life forms, therophytes (58, 33%) and phanerophytes (25%) dominate. Geophytes and hemicryptophytes are represented by only one plant species. Recorded invasive plant species come from North America (75%) and Asia (25%).

Using seismic recordings of event S1222a, we measure dispersion curves of Rayleigh and Love waves, including their first overtones, and invert these for shear velocity (VS) and radial anisotropic structure of the Martian crust. The crustal structure along the topographic dichotomy is characterized by a fairly uniform vertically polarized shear velocity (VSV) of 3.17 km/s between ∼5 and 30 km depth, compatible with the previous study by Kim et al. (2022), https://doi.org/10.1126/science.abq7157. Radial anisotropy as large as 12% (VSH > VSV) is required in the crust between 5 and 40 km depth. At greater depths, we observe a large discontinuity near 63 ± 10 km, below which VSV reaches 4.1 km/s. We interpret this velocity increase as the crust‐mantle boundary along the path. Combined gravimetric modeling suggests that the observed average crustal thickness favors the absence of large‐scale density differences across the topographic dichotomy.

In this paper we characterize all nilpotent orbits under the action by conjugation that intersect the nilpotent centralizer of a nilpotent matrix $B$ consisting of two Jordan blocks of the same size. We list all the possible Jordan canonical forms of the nilpotent matrices that commute with $B$ by characterizing the corresponding partitions.

Tungsten belongs to group of refractory metal that possess extraordinary resistance to heat and wear and it is the heaviest engineering material. Because of its properties tungsten is used for special purposes. This paper presents the results of mechanical and microstructure research on the example of the characteristic heavy tungsten alloys 91W-6Ni-1.8Fe-1Co and 93W-5Ni-1.6Fe-0.3Co with different Ni/Co ratios. The proper Ni/Co ratio is important to obtain a favorable microstructure and mechanical properties of these materials. The distribution of the W, Ni, Co and Fe elements in tungsten phase and binder phase, which can influence on mechanical properties of tungsten alloys. The SEM analysis and mechanical results show that the alloy, which has Ni/Co within the given limits,  posses a finer microstructure and better mechanical properties that is very important for the maintenance of the quality of tungsten alloys for special purposes.