bluuebunny/crossref_metadata_2025 huggingface dataset:
Correlation between Pregnancy Anemia and Nutritional Status of Pregnant Women to the Case of Toddlers 2-5 Years Old with Stunting
Authors: Aini Qurrotu , Mufarika Mufarika , Aini Nurieta
Published: December 2022

Stunting is a nutritional issue that has persisted for a long enough time to affect children who are shorter or lower than the average for their age in terms of height. The case control method is being used in this retrospective research design. the dependent variable of stunting and the independent variables of gestational anemia and pregnant women's nutritional condition. Mothers of toddlers between the ages of 2 and 5 make up the demographic. A case group of 25 people and a control group of 50 people were created from the sample. MCH books and observation sheets are both used in this study. Chi-square test and Odd Ratio test analysis Using the findings of Chi-square statistical tests on the variable anemia of pregnancy, Given that it has a value of 0.000, 0.05, or 6.682 (95% CI: 2.239–19.939), it is possible to draw the conclusion that anemia during pregnancy and stunting in toddlers between the ages of 2 and 5 have a causal link. With a confidence interval of 2.239-19.939, mothers who have a history of anemia during pregnancy run a 6.682-times greater chance of having children who are stunted. It was determined that there was a relationship between the nutritional status of pregnant women and the incidence of stunting in toddlers 2–5 years old based on the statistical test results for the variable nutritional status of pregnant women using Chi-square, which showed a value of :0.016 :0.05 OR 3.58 (95% CI; 1.228–10.431). With a confidence interval of, moms who have a history of poor nutrition are at an increased risk of 3.58 times having toddlers who are stunted. 228-10.431 . ANC K4 . It is hoped that health professionals can collaborate with community members and cadres to empower people in order to stop stunting.
Digital Marketing Effect on Decisions to Use Contractor Services
Authors: Pasau Paesa , Ramli Anwar , Wardhana Haeruddin Muhammad Ilham
Published: December 2022

The purpose of this study was to determine the effect of digital marketing on the decision to use contractor services (a case study on Facebook fanspage of PT Maswindo Bumi Mas). This type of research is associative with a quantitative approach, at the Digital Marketing office of PT Maswindo Bumi Mas, located on Jl. Topaz Blog B. The research was conducted using a simple linear regression analysis technique. The object of this research is the Facebook Fanspage of PT Maswindo Bumi Mas. The data sources used are primary and secondary data, where the Questionnaire is used as a tool to obtain data on the perceptions of PT Maswindo Bumi Mas clients who have carried out a Memorandum of Understanding (MOU). The data testing technique used as a test tool in this study is the validity test, reliability test, normality test, simple linear regression analysis, t (partial) test, test the coefficient of determination. The sample used in this study were PT Maswindo Bumi Mas clients who had signed an MOU of 100 people. The results of the study as a whole show that Digital Marketing has a significant effect on the decision to use the contractor services of PT Maswindo Bumi Mas.
The Influence of Price and Product Quality on Product Purchasing Decisions at Pt Intan Pariwara
Authors: Dewi Widhy Asti  , Hasbiah Siti , Wardhana Haeruddin Muh. Ilham
Published: December 2022

Dewi Widhy Asti. 2022. The Influence of Price and Product Quality on Product Purchase Decisions at PT. Pariwara Diamond. Supervisors: Siti Hasbiah and Muh. Ilham Wardhana Haeruddin. This study aims to determine: (1) the effect of price on product purchasing decisions at PT. Intan Pariwara Palopo Branch. (2) the effect of product quality on product purchasing decisions at PT. Intan Pariwara Palopo Branch. (3) the effect of price quality and product quality on product purchasing decisions at PT. Intan Pariwara Palopo Branch. The population in this study are consumers in 2019 - 2021 at PT. Intan Pariwara cab Palopo totaling 2,128,179 people. The sampling technique uses probability sampling technique. Data collection was carried out using a questionnaire method. The data analysis technique used is the classical assumption test and hypothesis testing with multiple linear regression analysis. The results of the research after the data were processed through the help of the SPSS program from data testing carried out by the results of the validity test and the results of the reliability test showed that the data used in this study were stated to be valid and reliable. Data testing is continued with the classical assumption test where from the results of the classical assumption test it can be stated that the data is normally distributed and the data used comes from the same (homogeneous) data. This is evidenced by the t test for the work experience variable which has a t_count > t_table value, that is, t count > t table, that is, 2.027 > 1.984 and a significance value of 0.012 <0.05 so it can be stated that the price variable has a partial effect on decisions purchase and Hypothesis acceptable. Then, price and product quality variables simultaneously influence the purchasing decision variable. The results of this study support the hypothesis which states that price and product quality simultaneously have a positive effect on purchasing decision.
The Effectiveness of Knee Exercise to Pain Intensity in Elderly Patients of Knee Osteoarthritis
Authors: Priyanto Agus , Abdillah Alvin , Sadiyah Halimatus
Published: December 2022

Pain is a physiological reaction due to a protective reaction to avoid stimuli that harm the body. Based on the results of the preliminary study, it was found that there were still many patients who experienced pain in the elderly with osteoarthritis . The purpose of this study was to analyze the effect of knee exercise therapy on reducing the level of knee osteoarthritis pain intensity . The research design is a quasy experiment. The population is 184 elderly with a sample of 32 respondents using simple random sampling . The independent variable is knee exercise therapy and the dependent variable is pain intensity in the elderly who suffer from osteoarthritis . The research instrument is the pain scale observation sheet. This study uses an observation sheet . Data analysis used the Wilcoxon test and the Mann Whitney test .Based on statistical test results Wilcoxon obtained p value (0.001) < α (0.05) meaning that there is a difference in pain intensity after being given knee exercise therapy, Wilcoxon statistical test results obtained p value (0.122) < α (0.05) meaning there is a difference in pain intensity after being given deep breathing relaxation therapy and the results Mann Whitney statistical test obtained p value (0.003) <α (0.05) meaning that there is a difference in pain scale after being given knee exercise therapy and deep breathing relaxation. Knee exercise therapy is effective in reducing pain intensity in patients with osteoarthritis. Researchers hope that health workers will maintain and continue providing health education on knee exercise therapy in non-pharmacological management of the elderly with osteoarthritis.
Parent Involvement in Increased Children's Application
Authors: Sa'diya Lida khalimatus , Wahyuningrum Tria , Purwati Heni
Published: December 2022

The nutritional status of toddlers is an important thing that every parent must know and the need for more attention to growth and development at the age of toddlers is based on the fact that malnutrition that occurs in toddlers is irreversible (cannot be recovered) Marimba, 2010. According to Andi Nurlinda, 2012 Nutritional status is one indicator in determining the health status of children. Good nutritional status can help the growth and development of children to reach optimal maturity. Touch and massage therapy for babies has many benefits for the baby's physiological changes, especially if the baby's mother does it herself. Mother is the closest parent to the baby, and the massage of the mother to her baby is a gentle stroke of binding the fabric of affection. The mother's skin is the skin that the baby recognizes first (Aminati, 2013). Massage is one of the complementary therapies that many parents choose. According to Roesli (2013), touch therapy (massage) can have a positive physical effect, including weight gain. Tui Na massage is a more specific massage technique to overcome eating difficulties in toddlers by improving blood circulation in the spleen and digestion (Sukanta, 2010).

This research is a literature review design. The data used is secondary data obtained from the results of research that has been carried out by previous researchers whose research journals have been published that are relevant to the topic, starting from 2015 to 2021 which are accessed in full text.

Yuni's research results, 2019 that there is an effect of tui na massage on weight gain. The results of the study by Titik, 2017 that Tui Na Massage is effective in increasing the weight of toddlers. The results of Happy's research, 2019 that there is an effect of massage on increasing the appetite of toddlers aged 1 year. There is an effect of massage on the increase in appetite for toddlers aged 1 year.

Based on the results of the research above, the child's appetite and weight after being given tui na massage treatment, the average growth of weight gain increased and appetite increased above the average baby who did not get massage treatment.
Study on the performance of GFRP strengthened, fiber reinforced lightweight foam concrete
Authors: Ramalingam Vijayalakshmi
Published: December 2022

Regular clay bricks and concrete blocks are replaced with light-weight fibre-reinforced foam concrete modules. For light weight foam concrete, various natural and synthetic fibes are employed as micro- and macro-fibre reinforcement. Three distinct fibres were used as fibre reinforcement in this study, and their strength qualities were investigated. As microfibre reinforcement, synthetic-polypropylene fibre, natural-Jute fibre, and banana micro fibres were used at volume fractions ranging from 0.22 to 0.55 percent in the foam concrete mix. The compression behaviour of stack bonded masonry prisms was investigated in the first phase of the experiment. The second phase of research focused on the microfibre-reinforced prism, which was reinforced with multiple layers of GFRP sheets. Both jute and banana fibres added as microfiber reinforcement to the matrix, impart ductility to the brittle masonry unit and reduce the sudden failure mode of the Fibre-Reinforced Lightweight Foam Concrete (FRLWC) prism. The insertion of GFRP sheets between the masonry layers provides additional stiffness and ductility to the FRLWC masonry prism, which greatly improves the post-cracking behaviour. When compared to a standard LWC prism, failure patterns show that both synthetic and natural fibre-reinforcement provide improved fracture bridging mechanisms, which is mostly owing to the arresting of cracks by micro polypropylene, jute, and banana fibres. The GFRP layers provided between the masonry units prevented the formation of major crack planes.
The impact of corporate social responsibility on the financial performance in the Republic of Serbia
Authors: Aleksić Marko , Pjanić Miloš , Berber Nemanja , Slavić Agneš
Published: December 2022

Under conditions of globalization and increasing market integration, competitiveness is a prerequisite for survival in the global market. The goal is not only to achieve a competitive advantage but to make it sustainable. The most stable and long-term source is reflected in business innovation. Innovative activities encourage companies' development and influence the preservation of market position as well as the company's profitability. The effects of applying the CSR concept can positively influence a company's financial performance. The authors of this paper investigate whether there is a connection between the concept of corporate social responsibility and financial performance in the Republic of Serbia. The paper presents the results of research conducted in the territory of the Republic of Serbia. The research covers 165 large companies during the period November 2019 - August 2021. The data were processed using the Smart PLS program. The research results show that the application of the CSR concept has a positive effect on the financial performance of large companies in the Republic of Serbia.
Effectiveness of technical audit in the power sector: A case from a developing country
Authors: Likha Clifton , Lipunga Andrew , Kuchande Steven
Published: December 2022

The paper examines the level and the factors that influence the effectiveness of technical audit in the power sector of Malawi from the perspective of auditors and auditees. Data was collected through a questionnaire that was analyzed using bivariate and multivariate statistics. Further to that, complementary data to measure the level of effectiveness was also collected and analyzed using the effectiveness calculator. Results show that the level of effectiveness of technical audit is low. Bivariate and multivariate analyses suggest that management support, organizational independence, and audit quality individually and collectively significantly influence the level of technical audit effectiveness.
Attributive quality of products in decibels
Authors: Popović Branko
Published: December 2022

Traditional engineering can successfully define only the quality of measuring instruments and completed processes (PCI precision indices and PPI accuracy), while the quality of process results (semi-finished product, product, software, service) can only describe (good or bad quality, better or worse quality). In the modern consideration of quality, the quality of process results, today is defined by the number of decibels (dB), according to the discovery of the genius Japanese scientist Genichi Taguchi (1924 - 2012), pursuant to the Robust Technology Development Method. and standard ratio (S/N). Modern engineering considers the quality of process results, measuring instruments, and completing processes according to their quality characteristics (continuous, attributive). More often, continuous characteristics that can be more precisely defined are considered, while attribute characteristics can only be estimated. In this paper, four different types of process result quality with one attributive input variable are considered. After the calculations, the following results were achieved: in two classes with one type of error, poor quality results were obtained - 28.52, in two classes with two types of errors, the results obtained that the separation of A2 is better than A1 due to the difference of 7,532 dB, in the (S/N) ratio of the chemical reaction without side effects, the required results were obtained, in the methods of the ratio of the reaction rate of a chemical reaction with the side reactions, good quality results of 17.40 dB were obtained.
Minimum covariance determinant-based bootstrapping for appraising air passenger arrival data
Authors: Tutmez Bulent
Published: December 2022

Air travel management is a case-special process since it includes different types of uncertainties such as ungovernable passenger mobility, variable costs as well as extraordinary restrictions like the Covid-19 pandemic. Therefore, the use of robust and reproducible statistical evaluations under uncertainty is required. The cornerstone of this study is the adaptation of bootstrapping and the robust Minimum Covariance Determinant (MCD)-based parameter estimation under a heterogeneous process. In addition, the study includes a novel bootstrapping regression implementation. The methodological developments have been tested by Serbia's air transport data. The results showed that combining robust estimator and bootstrapping provides some advantages for determining outliers and also making advanced diagnostics. Thus, a state-of-the-art approach based on accuracy, reproducibility, and transparency has been introduced and its usability in the air travel mobility process has been exhibited.
Selection of collector composition and temperature conditions for diamond foam separation
Authors: Morozov V.V. , Kovalenko E.G. , Dvoichenkova G.P. , Pestryak I.V. , Lezova S.P.
Published: December 2022

Quantitative and qualitative regularities of a collector low and high molecular weight fractions distribution between solid and liquid phases in foam separation process were determined with the use of extraction-spectrophotometrical technique. The feasibility of producing a collector with optimal ratio of fractions of light distillates, hydrocarbon oils, resin, and asphaltenes by mixing M-40 fuel oil with diesel fuel oil in specified ratios was substantiated. It was shown that applying compound collectors with M-40 fuel oil weight percentage of 60-70 enabled increasing diamond recovery by 2.7-3.5%. Similar increase was also achieved when using F-5 bunker fuel oil diluted by 10-18% with diesel oil fraction. The optimal temperature of 24 °C for initial ore feed conditioning with flotation agents and foam separation providing maximum diamond recovery into concentrate and high selectivity was determined. The proposed collectors and temperature conditions enabled increasing diamond recovery.
Evaluation of excavator energy consumption and overburden cutting resistance using multiple linear regression
Authors: Trivan J. , Kostić S.
Published: December 2022

In present paper the energy consumption of the excavator and overburden linear cutting resistance by invoking the multiple linear regression was examined. As a result, the corresponding models as nonlinear functions of physical and mechanical overburden properties: grain size, unit weight, cohesion, and friction angle, were proposed. The analysis was based on records made at ''Tamnava Eastern Field'' mine for the bucket-wheel excavator with new excavation teeth. The obtained results indicated that excavator energy consumption significantly depended on the grain size and cohesion, as individual factors, while the effect of two-factor interactions was particularly significant: clay percentage with cohesion and small grained sand fraction, and friction angle with medium grained sand and cohesion. On the other hand, linear cutting resistance of the overburden was largely controlled by all the examined physical and mechanical properties (grain size, unit weight, and shear strength), with the following significant two-factors interactions: shear strength parameters with all grain size fractions, different grain size fractions among each other, and friction angle with unit weight.
Effects of foreign direct investment on the economy and environment
Authors: Bukša Tomislav , Bukša Juraj , Kosovac Ivana
Published: December 2022

Classical theories linking increased CO2 emissions to a country's economic development supported by foreign direct investment in industrial plants, coking plants, ironworks, shipbuilding, and other heavy industries marked the 20th century, with large MNCs seeking refuge in underdeveloped economic development. The second millennium of Croatia began with deindustrialization, both due to the extinction of large state-owned industrial losers and due to transformation and privatization, where the interest of capital was in the financial and tourism sectors. This does not mean that FDI was not present, but the expected greenfield investments were missing, especially after joining the EU. To what extent FDI has influenced the increase in carbon emissions is the subject of research in this paper.
First year student attitudes toward distance learning
Authors: Banjević Koviljka , Gardašević Dragana , Nastasić Aleksandra , Rošulj Dragana
Published: December 2022

Over the last two years, since the beginning of the COVID-19 pandemic, Higher Education Institutions (HEIs) in Serbia worked in the modality of distance learning - instructions and students' assignments were performed by distance, while colloquia and exams were realized in traditional conditions. Regardless of modality, HEIs have to ensure high-quality education in every single course. In this sense, the feedback from students is very important. The purpose of this study is to investigate students' attitudes about four dimensions of distance learning - fulfilment of preconditions, organization and realization of instructions, advantages/disadvantages of distance learning, communication and social interactions. Data was collected from 183 first-year students within three courses at The Academy of Applied Technical Studies Belgrade, and was processed in the SPSS software package. The research strategy included descriptive statistics, while the Likert scale was used to assess the satisfaction of the respondents. Analysis of variance and independent-sample t test were used to examine differences in opinions among different groups of respondents. The results of this study could be important for instructors, HEIs that operate in similar conditions, policymakers in the field of HE in Serbia, as well as for present and future research in this area.
Analysis and influence of the level of innovation & leadership on the level of organizational changes
Authors: Momčilović Oliver , Vujičić Slađana , Doljanica Dragan
Published: December 2022

In order to improve both the internal and external functionality of the organization, organizational changes are increasingly sought. Changes are of great importance and without a doubt they are of crucial importance for strengthening and improving organizational efficiency. Organizational changes were always complemented by planned strategies and aligned with the organizational goal. The process of change is very challenging and important for organizations because it represents its path to success. Also, through organizational changes, organizations can be made capable of meeting future consumer demands and competing effectively with other market participants. However, many authors state that the changes are conditioned by a large number of factors. The aim of this paper is to examine the impact of leadership and innovation on the development of organizational changes in organizations in Serbia.
Joint and direct effects of genotypes and environment conditions on yield and yield components variability of maize inbred lines
Authors: Tabaković Marijenka , Dragičević Vesna , Simić Milena , Stanisavljević Rade , Pošić Dobrivoj , Brankov Milan , Oro Violeta
Published: December 2022

This study aimed to evaluate the influence of environmental conditions and genotype on the yield of three maize lines and the morphological properties of ears and seeds. Three hybrid maize lines were used as material in the study conducted in two consecutive years (2018 and 2019) at one location (Zemun Polje, Belgrade, Serbia). The following parameters were monitored: seed weight (SW), seed volume (V), bulk density (BD), ear length (EL), ear thickness (ET), fraction content and seed yield (MSY). Calibration divided the seed into a small seed fraction of 6.5-8.4 mm (SF) and a large seed fraction of 8.5-11 mm (LF). Seeds smaller than 6.5 mm and larger than 11 mm are presented as seed waste fraction (FW). The average seed yield for all three lines in the first and the second year was 6.13 and 4.66 t ha-1 , respectively. A significant impact of the environment was noticed on seed weights in both years (2018 and 2019), i.e. 327.56 and 251.77 g, respectively. The total variation in yield determined by the morphological characteristics of the seed was R2 =0.514
Effect of non-thermal plasma on cellulose crystallinity and lignin content in corn stalks
Authors: Grbić Jovana , Đukić-Vuković Aleksandra , Mladenović Dragana , Lazović Saša , Mojović Ljiljana
Published: December 2022

Lignocellulosic biomass is a cheap raw material that, thanks to its high carbohydrate content, can be used in fermentation to produce biofuels, biogas and other compounds. Its complex structure, including cellulose, hemicellulose and lignin, requires prior treatment of the biomass to facilitate hydrolysis to simple sugars. Today, biomass is only partially utilized and generates about 14% of the world's energy. This is because the most commonly used physical, chemical and physicochemical treatments are not sustainable. They are energy-consuming but still low in productivity and toxic inhibitors formed during these treatments could hinder later steps of fermentation. Biomass treatment with advanced oxidation techniques has great potential as an environmentally friendly, so-called "green" treatment. These processes generate reactive species (radicals, electrons, ions and peroxides) that attack cellulose, hemicellulose, and lignin components. In this work, the effects of non-thermal plasma, the Fenton process, and the combined treatment of corn stalks with non-thermal plasma/Fenton were compared. Grounded biomass of corn stalks was mixed with Fenton reagent and hydrogen peroxide at different ratios and subjected to non-thermal plasma treatment. Carbohydrate content was decreased in non-thermal plasma treated samples both with and without Fe2+. However, a specific biomass: Fe2+:H2O2 ratio was required to achieve the highest rate of lignocellulose decomposition. The cellulose and hemicellulose fractions were affected and reduced by the treatments studied but resulted in almost no changes in the cellulose crystallinity index. The lower lignin content and cellulose crystallinity allow for more efficient enzyme hydrolysis of the treated lignocellulose and new options for valorization in fermentations.
Wholegrain flours of differently colored maize kernels as macro-and micronutrient-rich food ingredients
Authors: Nikolić Valentina , Žilić Slađana , Simić Marijana , Vasić Marko , Srdić Jelena , Radosavljević Milica
Published: December 2022

Four commercial wholegrain flours made from differently colored kernels of maize genotypes produced in Maize Research Institute "Zemun Polje" were used as the subject of this study. Values of major chemical components as well as mineral nutrients, antioxidants and some vitamins of wholegrain flours obtained from white dent hybrid, yellow popping maize hybrid, red dent variety and blue popping maize landrace are presented. All flours had high fiber content (6.9-10.4%), while total protein ranged from 8.5% to 12.2%. A high level of anthocyanins was determined in blue popping maize wholegrain flour (910.0 mg CGE/kg), whereas yellow popping maize flour had a high content of total carotenoids (26.5 mg bCE/kg). Total antioxidant capacity was the lowest in white (15.50 mmol Trolox Eq/kg) and the highest in blue popping maize flour (37.6 mmol Trolox Eq/kg). All investigated wholegrain flours contained high levels of potassium and magnesium, as well as high content of trace elements, namely iron, zinc, copper and manganese. The maize flour is naturally gluten-free, which makes it highly suitable for persons susceptible to a gluten allergy and those with celiac disease. These results indicate that the wholegrain ZP maize flours can be used as functional food ingredients.
Potential risks and problems in the cultivation of perennial energy crops
Authors: Dželetović Željko , Andrejić Gordana , Simić Aleksandar , Geren Hakan , Aleksić Uroš , Brajević Snežana
Published: December 2022

Second-generation biofuel production systems are significantly better than first-generation systems. However, the size of areas in which the energy crops are grown depends on public support, and it decreases if public support is missing. Despite all the environmental and economic benefits, perennial energy crops do not currently play a significant role. It is believed that available land areas will be a basic limiting factor for cultivating biofuel crops in the EU. On the other hand, there is significant untapped potential for bioenergy production in abandoned and marginal land in Southeast Europe. At the same time, perennial energy crops are investments with certain risks. Economically viable production of dedicated energy crops will be difficult to achieve on most lands classified into V-VIII land capability classes. In terms of the risk of farming investments, maize has an advantage over all perennial energy crop systems. We have identified 10 types of risks for successful production of energy crops: (1) Crop water supply; (2) Weed infestation in crops; (3) Risks of frost damages; (4) Crop lodging; (5) Crop diseases and pests; (6) Short harvest periods and variable yields; (7) Economic viability of cultivation on land areas of lower land capability class; (8) Influences of agricultural practices and agro-ecological conditions on biomass quality; (9) Storage of harvested biomass and fire hazard; and (10) economic sanctions, war, and war surroundings. Although the cultivation of perennial energy crops has a perspective, it must be systematically planned and further improved.
Selection of business models in unstable conditions in mining companies
Authors: Miletić Slavica , Bogdanović Dejan , Stojanović Goran , Milijić Ana , Trišić Marko
Published: December 2022

This paper aims to rank business models for successfully overcoming socio-economic instability through criteria using an appropriate multicriteria decision-making method (MCDM). In this paper, the AHP method was used to calculate the difficulty criteria. The literature review identified and analyzed six business models: digital business models where companies will be found, competitive advantage models, global, deglobal, market models based on new products and services and customer-built business models. The findings of this research improve the understanding of several business models on the basis of which the management of mining companies can successfully overcome the socio - economically unstable situation.
Transformations of mechanochemical activated Na2CO3
Authors: Đorđević Nataša , Mihajlović Slavica , Pantović-Spajić Katarina , Lozanović-Šajić Jasmina , Grubišić Mirko
Published: December 2022

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.
Coal cleaning before combustion: Practice and experience in Serbia
Authors: Kostović Milena , Simović Ivana , Kostović Nebojša , Pantelić Nina
Published: December 2022

The paper gives review of international and domestice experience in Serbia in the field of coal cleaning prior to combustion in thermal power plants. Also, the paper highlighted the problem of combustion low rank lignite from open pit mine in thermal power plants and considering this problem from the aspect of mineral processing. The results of laboratory tests aimed to establish the possibility of cleaning of lignite from Tamnava Zapadno polje, showed the beneficial upgrading of the 70% of run-of-mine coal with simple screening. It has been confirmed that by simple process of coal cleaning can be removed about 30% of tailings, which mostly consist of mineral impurities. The final obtained products have satisfactory quality (lower contents of ash and higher calorific values).
The effects of exertional heat stress on some complex cognitive functions
Authors: Stojićević Jelena , Jovanović Vanja
Published: December 2022

Introduction/Aim: Heat stress represents the important problem in military services. This study investigates the effects of exertional heat stress on complex cognitive functions. Methods: 40 male soldiers performed exertional heat stress test, of which 10 performed the test of the same intensity in cool environment. Cognitive functions were mesured by computerized battery CANTAB, before and immediately after exertional heat stress test. Results: Exertional heat stress led to impairment of some cognitive functions in unacclimatized group: decrease of accuracy in MTS test (from 92,6±4,2% towards 84,5±6,9%, p<0,05) and PSRs (from 85,0±8,0% towards 77,0±9,6%, p<0,05), while similar decreases were recorded in MTS test in passively acclimatized group (from 92,2±5,5% towards 87,7±5,6%, p<0,05) i.e. in PSRs test in actively acclimatized group (from 83,3±6,3% towards 69,4±5,1%, p<0,05). The reaction time was not affected in any group whatsoever. Discussion and conclusion: Exertional heat stress leads to mild impairment of complex cognitive functions, particularly in domain of accuracy. Physical strain itself, however, does not affect cognitive functions. Relatively resistance to heat stress in zoung soldiers may be contributed to their high aerobic level.
Effectiveness of coronavirus disease-19 vaccination on disease transmission, hospitalization, and clinical outcomes in adults in North India
Authors: Shah Kshitij
Published: December 2022

Background: Covaxin and Covishield vaccines have rapidly rolled out in India to curb the pandemic. We aimed to test the hypothesis that COVID-19 vaccination is clinically effective. Methods: This study was conducted in the Department of Physiology at MGM College, Jaipur, India after approval from the Ethics Committee. Vaccinated and non-vaccinated groups were tested on disease transmission, hospitalization, and clinical outcomes. Researchers collected data using questionnaires circulated through google forms. The association between attributes was tested using the chi-squared test. The significance level was considered at 5%. Results: The vaccination significantly reduced disease transmission of COVID-19 [c2=4.51; p = 0.034]. However, no significant differences were seen in RTPCR positivity, chest CT findings, and hospitalization on vaccination. COVID-related symptoms and their severity were not statistically different between the two groups. Most elderly were vaccinated [c2=41.68; p < 0.001]. Most youths took one dose, while the elderly took two doses of the vaccine [c2=41.77; p < 0.001]. All age groups had similar severity of AEFIs [c2=13.22; p < 0.21]. The vaccination status across gender did not differ significantly. [c2=1.13; p < 0.288] Most males took two doses as compared to females [c2=6,57; p < 0.01]. Adverse effects post-immunization were more severe in females than males [c2=13.10; p < 0.001]. There was no association between the number of vaccine doses and the severity of AEFIs [c2=16.42; p = 0.06]. Conclusion: The present study concludes the beneficial effect of vaccination in reducing disease transmission. However, vaccination has no role in mitigating other COVID-related outcomes.
Treatment fracture of the diaphisis humerus with functional plaster
Authors: Jovanović Saša , Miljković N. , Petrović D. , Jakšić Lj. , Radojević G. , Božović A.
Published: December 2022

Treatment of humerus fractures is divided into operative and non-operative treatment Fractures of the diaphysis of the humerus heal well. Surgeons today have many opportunities to treat them. The decision on the type of treatment to be applied depends on the location of the fracture, the existence of associated injuries, the age and the general condition of the patient. Non-operative treatment is most often applied, although there are fractures in which surgical intervention is necessary in order to perform healing and prevent complications. Non-operative treatment of fractures of the diaphysis of the humerus gives good results, with little angulation and minimal or no shortening of the arm. Adequate repositioning, appropriate plaster immobilization and regular X-rays heal the fracture within the allotted time. Disciplined early physical therapy in terms of circular movements prevents shoulder contracture and allows later physical therapy to last significantly shorter. Non-operative treatment lasts from 7-11,5 weeks.
Improvement of growth, yield and nutritional status of maize (Zea mays L.) through X-ray bombardment of seed
Authors: Mbah Emmanuel
Published: December 2022

Crop improvement faces a lot of challenges ranging from genetic effects of seeds to environmental factors, among others. Therefore, certified hybrid seeds of maize (Oba super II), were exposed to three different doses of X-ray radiation: 3 MGy, 6 MGy, 9 MGy and a control, no exposure (0 MGy) to assess the effect of irradiation on growth performance, grain yield and nutritional status of maize. The field research was conducted in 2016 cropping season at Michael Okpara University of Agriculture, Umudike (latitude 05º 29'N; longitude 07º 33'E; altitude 122 masl), southeast Nigeria. The experiment was laid down in a randomized complete block design with three replications. The results indicated that X-ray irradiation significantly affected growth, yield and nutritional status of maize. The application of 6 MGy of X-ray dose gave the longest cob, highest 100-seed weight and grain yield (4,973.00 kg ha-1 ) as well as nutritional values of the crop such as b-carotene, vitamin C, protein and phosphorus relative to the other treatments suggesting a possible genetic synergy from the dosage level. Correlation showed that above ground dry matter, crop growth rate and absolute growth rate had positive and significant (P≤0.05) relationships with grain yield. The mean sequence of grain yield obtained from maize due to X-ray bombardment of the seeds before planting was in the order: 6 MGy X-ray irradiation>9 MGy X-ray irradiation>3 MGy X-ray irradiation>0 MGy X-ray irradiation. The implications of these results can lead to further improvement of maize varieties in southeast Nigeria.
Geopolymer concrete: Properties, durability and applications: Review
Authors: Kakasor Jaf , Ismael Abdulrahman , Qarani Aziz
Published: December 2022

Concrete is one of the most reliable, durable, and desired construction materials. It became the second most used material after water in the world. Many studies and investigations reported that the amount of CO2 released into the atmosphere is nearly 1 ton in the production of 1 ton of cement, which contributes to 5-7 % of total CO2 emissions worldwide. Geopolymer concrete (GPC) is a new development in the world of concrete, which does not need to use cement. The most used materials in geopolymer are by-products such as fly ash, ground granulated blast furnace slag, silica fume, etc. Industrial waste materials are a great problem for human health, environment, and scarcity of land, therefore, reusing them in GPC manufacturing can be seen as a great advantage. Fortunately, most of the recent research concludes that most by-products exhibit similar or better durability, mechanical and physical properties when compared to ordinary concrete. Therefore, GPC became a good sustainable engineering material with many advantages over conventional concrete, such as high early strength, excellent resistance to chemical attacks and steel reinforcement corrosion, elimination of water curing, low cost, etc. This paper reviews the process of geopolymer concrete, constituents, types, properties, durability, and particular applications.
Air and precipitation testing as part of environmental radiation monitoring in the vicinity of nuclear facilities
Authors: Knežević Jovana , Lazarević Nataša , Forkapić Sofija , Bikit-Šreder Kristina , Radumilo Vesna , Arbutina Dalibor
Published: December 2022

Public company "Nuclear Facilities of Serbia" is the only operator of nuclear facilities and holder of licenses to perform nuclear activities in the country. By the current legislation, environmental radiation monitoring in the vicinity of nuclear facilities is performed to assess the level and control the external exposure of the population and environment to ionizing radiation due to the operation of nuclear facilities. This paper presents an overview of the representative environmental radiation monitoring results regarding radioactive contamination level and ambient gamma dose rate equivalent in air and precipitation for the year 2021. The obtained results show that there is no adverse influence on the population and environment and the radiation risk for individuals in the population is negligible.
Load of remote controlled battle station upper carriage with integrated automatic grenade launcher
Authors: Ivković Milan , Milovanović Vladimir , Nedić Bogdan , Đurić Stefan
Published: December 2022

The paper presents a numerical analysis, using the finite element method, for the case of static and dynamic loading of the upper carriage of the remote-controlled combat station, due to the recoil force generated by the operation of the integrated automatic grenade launcher 30mm M93. The paper describes the problem of integrating the BGA 30mm M93 automatic grenade launcher onto the combat platform, and based on the dimensions of the automatic launcher, modeling of the automatic launcher stand with cradle was carried out. As a result of the weapon dynamics equations and internal ballistics calculations, the pressure force of the gunpowder gases and the recoil force of the automatic grenade launcher were calculated. The paper also presents the results of the dynamic analysis of the finite element model of the upper gun carriage loaded with the obtained impulse recoil force for different elevation angles of the weapon.
Influence of differently cured polymeric binders on rheology properties of plastic explosives
Authors: Bajić Danica , Dimitrijević Ivan , Terzić Slavica
Published: December 2022

Plastic Explosive Compositions consisting of HMX and liquid polyurethane binder were prepared in order to determine influence of differently cured polymeric binders on rheological properties of plastic explosives. First, a set of polymeric binders was prepared in polyaddition reaction between HTPB and IPDI, with varying NCO:OH ratio and examined through the standard and non-standard rheological tests on a dynamic rotational rheometer. Viscosity curves of polymeric binders show viscosity increase with NCO:OH ratio increase, as expected. Amplitude sweep tests reveal liquid-like structure of PEs, with structure strength increase with higher NCO:OH ratio of polymeric binder used, and limiting values of LVER vary from 10-3 to 10-2 strain. Results of creep test reveal that with increase of NCO:OH ratio of polymeric binder in PE zero-shear viscosity increase and viscous portion deformation decrease. Also, penetration decrease with increase of NCO:OH ratio. The obtained results indicate that initial rheology testing is crucial in plastic explosive formulation regarding their processability and physical properties.
Active disturbance rejection control of unmanned tracked vehicle
Authors: Banjac Goran , Stanković Momir , Manojlović Stojadin
Published: December 2022

Significant improvement of the unmanned vehicles possibility has achieved by increasing its autonomy, i.e. by excluding the human operator from the guidance loop. In this paper is considered the autonomous control of the unmanned tracked vehicle (UTV) in the presence of the unknown caterpillar tracks slippage. The longitudinal and lateral control model for the UTV path following problem are developed. To handle unknown uncertainties and slippage disturbances, the design of active disturbance rejection control (ADRC) for both, longitudinal and lateral control channels, are proposed. ADRC strategy is enabled that all the control channel uncertainties and disturbances are treated as one lumped (total) disturbance, which is defined as an extended system state and estimated by appropriate extended state observer (ESO). Further, applying the appropriate closed-loop control laws, based on the total disturbance estimation, the complex longitudinal and lateral control problems are reduced to disturbance-free model control. The numerical simulations for the different path following scenarios and caterpillar tracks slippage dynamics are given to verify effectiveness of the proposed UTV control.
The analysis of the revenues and expenses during COVID-19 pandemic: The case of companies of the Sector I: Accommodation and food services of the Belgrade stock exchange
Authors: Milašinović Marko
Published: December 2022

The operations of companies in the field of tourism and catering have changed to a significant extent with the emergence of the COVID-19 pandemic. The aim of the work is to determine whether there have been changes in the income and expenses of hospitality companies in the Republic of Serbia with the onset of the COVID-19 pandemic. The research in the paper was carried out on the example of 15 companies listed on the Belgrade Stock Exchange within Sector I-Accommodation and Food Services, where their income statements for 2019 and 2020 were used as a data source. For research purposes, horizontal analysis and ratio analysis were used. In the largest number of observed hospitality companies in 2020, a decrease in income and expenses was recorded compared to 2019. Also, it was determined that in the largest number of observed companies, there was an increase in the ratio of total expenses and total income during the observed period. The results of the work can be of importance primarily to the management and owners of catering companies, in order to see the impact of the COVID-19 pandemic on financial performance, but they can also be useful to investors when making decisions about investing their funds, i.e. to economic policy makers when defining measures to overcome the consequences of the crisis.
The influence of gastronomic offer and services on the branding of hotel Divčibare
Authors: Zrnić Miloš , Gajić Tamara , Vukolić Dragan
Published: December 2022

The gastronomic offer and restaurant service have always played a very important role in the branding of hotel facilities. The subject of the research refers to the Divčibare hotel (Maljen mountain, R. Serbia). The goal and task of this study is to examine the attitudes and opinions of hotel guests how service and culinary choices can affect respondents' satisfaction and guest loyalty. The survey was conducted in September 2022 on a sample of 250 respondents. Methods used in paper to obtain research answers are: descriptive statistical analysis, Mann Whitney test, arithmetic mean and standard deviation, reliability analysis, Cronbach's Alpha coefficient, Correlation analysis and Pearson's coefficient. Based on conducted research, respondents indicated that hotel gastronomic offer, loyalty, satisfaction and services provided, can greatly affect the branding of the Divčibare hotel.
Art Nouveau style buildings as a chance for the development of architecture in Novi Sad
Authors: Mijuk Nenad
Published: December 2022

By the end of the 20th century, a new specific form of tourism was presented to the world by the name of architourism. Architecture, in a general sense, is science and the art of projecting and shaping buildings or, i.e., interior and exterior architectural space. Novi Sad, the second largest city in Serbia, located on Pannonian Plain, is famous for its incredibly rich historic and cultural heritage. There are various styles of architecture dominating the city itself, among which is the ever-present Art Nouveau in the Hungarian style. Novi Sad has fewer monuments and buildings erected in this style, as opposed to Subotica, but they are very high-quality and distinctive. Some influential architects had worked in that period in Novi Sad, and on top of that list was Lipot Baumhorn, responsible for the Synagogue, Menratova palace, the palace of "Vojvođanska banka", followed by Karolj Kovač, Đerđ Kopecki, Imre Frensek, Geza Markuš, Frđeš Špigel, Bela Peko, and others. This paper aims to emphasize the cultural-historic influence of buildings in the Art Nouveau style as a significant form of tourism.