The majority of refractories used today are associated with the iron and steel industries. Typically, the refractory lining of a blast furnace consists of a combination of different refractory materials chosen for different portions of the furnace, as well as distinct process conditions and temperature ranges. Knowledge and requirements for the iron manufacturing system in conjunction with the physical, mechanical, and chemical qualities of the proposed refractories determine the choice of refractory combination. Inadequate understanding of the aforementioned components frequently results in refractory failure, which then becomes a difficult problem to tackle. A blast furnace's refractory liner typically fails owing to any number or combination of these variables. To facilitate comprehension, we will explain the types of refractory lining required in a blast furnace by region, as well as the observed trend in refractory lining patterns over the past few decades.
This paper presents the results of an experimental investigation into the effect of nano-silica addition on the mechanical properties and durability of concrete. Three mixes of concrete containing 0%, 2%, and 4% nano-silica by weight of cement were tested. The slump of fresh concrete as well as compressive strength, dynamic modulus of elasticity at 2, 7, 28, 90, and 180 days, and flexural strength at 2, 28, and 90 days of hardened concrete were determined. As for indicators of concrete durability, the total volume of permeable voids, water absorption, the rate of water absorption, and the freeze-thaw scaling resistance were determined. Test results showed that the incorporation of nano-silica in concrete resulted in an improvement of all mechanical properties of concrete, as well as concrete durability parameters that are tested.
Fly ash class F from Thermal Power Plant “Stanari” was used in combination with highly plastic brick clay from Busovača to develop building bricks. The brick clay and fly ash were characterized for chemical and mineralogical composition, grain size distribution, and specific gravity. The fly ash has a higher proportion of larger particles and lower specific gravity than clay. The brick clay was mixed with 20, 40, and 60 wt. % of fly ash, formed in a prismatic shape, dried and then fired at 800, 900, and 1000 °C. The fired prisms were characterized for water absorption, apparent porosity, apparent density, and strength and compared with conventional clay prisms. The addition of fly ash of 20, 40, and 60% reduced the mass of the samples by 14, 23, and 31%, increased apparent porosity by 60, 100, and 160%, and reduced the compressive strength by 50, 80, and 90%, respectively. Conducted tests and comparative studies have shown that the fly ash “Stanari” can be used as an additive to the clay “Čavka” in the maximum amount of 20 % and the optimum firing temperature is 900 °C.
In this study, the physical properties (oven-dry density, basic density, volumetric shrinkage, and swelling) and structural components (cellulose, lignin, and extractives content) of three wild almond wood species from southwestern Iran, namely Amygdalus arabica, Amygdalus eburna, and Amygdalus scoparia, were investigated. Wild almond is a valuable wood species in the Zagros forests of Iran, but there is a lack of data on their wood properties. Three adult trees of each species were chosen, and samples were prepared from the breast height diameter to measure the focal properties. Results of analysis of variance (ANOVA) showed that the wood species had a significant effect on the wood density and volumetric shrinkage. Maximum oven-dry density and volumetric shrinkage of wood were identified in Amygdalus scoparia. The highest and lowest content of structural components were found in Amygdalus scoparia and Amygdalus arabica wood species, respectively. A deep understanding of the almond wood characteristics will provide a fresh insight into the relationship between the properties and conservation of these special, as well as applications of their wood.
The paper presents one aspect of the analysis of energy consumption and productivity of the manufacturing operation. As an example of the operation, the operation of turning with a single-blade tool was taken. Sustainable development in its general concept implies sustainable materials, sustainable design, and sustainable manufacturing. This paper presents an analysis of one important part of sustainable manufacturing, and that is energy saving. The experimental study was conducted as follows. In laboratory conditions, an experimental-mathematical regression model of the relationship between cutting force and processing conditions was defined. Machining experiments were performed under ECO-friendly conditions with technology known as MQCL (Minimum Quantity Cooling Lubrication) machining. The obtained mathematical model was used to calculate the energy consumption and the workpiece material removal rate (MRR, productivity). The results of the analysis showed that there is a lot of space for optimization of machining conditions from the aspect of power consumption, with mandatory calculation and other machining costs, above all, the cost of tools and machine tools. In this regard, recommendations for analysis with the aim of power saving are given.
By presenting the contemporary intercultural, interreligious, and peace dialogue in the space and place of Jerusalem and the more general Israel-Palestine conflict, attempting to remain outside the mainstream political framework, the paper examined sociopolitical-religious synergy and partially, critical human securitization. Interculturalism, multiculturalism, and such notions emerged in the 1970s, emphasizing different cultures' equivalence and dialogue. Besides cultural and territorial determinants of Arab-Israeli conflict, the status quo is conditioned by a religious rather than a secular approach to political organization. Both civilizations, peoples view the area they inhabit through religious rights, turning history into theology and different theology into sociopolitics. It presents a human conflict. While religion and nationalism based on power have often contributed to antagonism, violence, and wars, the objectives of the three monotheist religions addressing peace suggest a shift towards mutual compromise from hegemonic visions to practical expectancies. Jerusalem is the holy place where all confessions have the right of residence. Infiltration of faith into this political dispute, Islamism, and Judaism is a religious aspect disputed between Jews and Arabs. Conflicts are mainly due to territory, and religion gives it a higher purpose within narratives regarding supernatural rights. Despite the inter-religious tensions and passions involved in the contradictory faith elevation at this religious source, the internal and external peace is influenced by politics. The holy Jerusalem has been perpetual - the case. Many unadulterated Jews, Catholics, and Palestinians, who desire the city's lasting security, should be more willing to compromise. The future sociopolitical life must work around healthy economic development and human security. The revenge paradigm could negatively influence sustainable peace, maintaining violence and hybrid wars within social, psychological, historical, cultural, and stagnation reasons. There is a comparable paradigm in the Balkans- Bosnia to Israel-Palestinian question, where similar policies maintain and clerical, national, and ethnopolitical patterns materialize, i.e., critical peace stalemate persists.
The aim of this study was to examine the frequency of consumption of coffee beverages in the city of Mostar. In 2019, an analysis of caffeine content was performed on HPLC in 10 different samples of coffee beverages. Samples of coffee were taken from the market of the city of Mostar by random selection. In addition to the High-performance liquid chromatography (HPLC) method, the study was conducted using empirical and descriptive methods. An assessment of daily (EDI) and weekly intake (EWI) was also performed were on the base of determined values of caffeine content in 10 different coffee samples. The acute toxic dose of caffeine is not well defined, but it is considered more than 10 grams of caffeine per day for adults, while in most countries it is not recommended that more than 450 mg of caffeine be consumed per day. The samples were found to be in accordance with the EFSA Scientific Opinion (European Food Safety Authority) stating that a single dose of 200 mg of caffeine from all sources does not pose a risk to the health of healthy adults. (EFSA, 2015).
C. jejuni and C. coli have the greatest zoonotic potential. In humans, they cause campylobacteriosis with symptoms of food poisoning. Epidemics are mostly related to the consumption of non-chlorinated water and contaminated chicken food and in the spring-summer season. Since 2005, according to the European Food Safety Agency and the European Center for Disease Prevention and Control, campylobacteriosis has been considered the leading alimentary intoxication. A review of the literature was published in Medline, PubMed, Google Scholar, electronically available scientific journals, books, textbooks, proceedings books and reports EFSA/ ECDC, FAO/ WHO. Only literature in English, Bosnian/Croatian/Serbian is included. As a measure to prevent campylobacteriosis, sanitation is recommended in the primary production of chicken meat, and the use of probiotics in meat as biological preservatives is being investigated
Key Points The aptamer rondoraptivon pegol improved VWF/FVIII levels, multimer patterns, and thrombocytopenia in type 2B von Willebrand disease. Once weekly subcutaneous injections of rondoraptivon pegol may in the future be used for prophylaxis or treatment of VWD.
In this paper the first record of the alien mantis species Hierodula tenuidentata for Bosnia and Herzegovina is provided. This large mantis has considerably expanded its distribution range in Europe in the last years, particularly in Balkan Peninsula. We found several adult specimens on 22nd and 23rd of August 2021 in urban area of Mostar city in the south of the country. This finding confirms the species’ establishment in the western part of Balkan Peninsula and fills the distribution gap along the eastern Adriatic Sea coast.
Distributional shift, or the mismatch between training and deployment data, is a significant obstacle to the usage of machine learning in high-stakes industrial applications, such as autonomous driving and medicine. This creates a need to be able to assess how robustly ML models generalize as well as the quality of their uncertainty estimates. Standard ML baseline datasets do not allow these properties to be assessed, as the training, validation and test data are often identically distributed. Recently, a range of dedicated benchmarks have appeared, featuring both distributionally matched and shifted data. Among these benchmarks, the Shifts dataset stands out in terms of the diversity of tasks as well as the data modalities it features. While most of the benchmarks are heavily dominated by 2D image classification tasks, Shifts contains tabular weather forecasting, machine translation, and vehicle motion prediction tasks. This enables the robustness properties of models to be assessed on a diverse set of industrial-scale tasks and either universal or directly applicable task-specific conclusions to be reached. In this paper, we extend the Shifts Dataset with two datasets sourced from industrial, high-risk applications of high societal importance. Specifically, we consider the tasks of segmentation of white matter Multiple Sclerosis lesions in 3D magnetic resonance brain images and the estimation of power consumption in marine cargo vessels. Both tasks feature ubiquitous distributional shifts and a strict safety requirement due to the high cost of errors. These new datasets will allow researchers to further explore robust generalization and uncertainty estimation in new situations. In this work, we provide a description of the dataset and baseline results for both tasks.
Nema pronađenih rezultata, molimo da izmjenite uslove pretrage i pokušate ponovo!
Ova stranica koristi kolačiće da bi vam pružila najbolje iskustvo
Saznaj više