Humidity sensing is important to a variety of technologies and industries, ranging from environmental and industrial monitoring to medical applications. Although humidity sensors abound, few available solutions are thin, transparent, compatible with large-area sensor production and flexible, and almost none are fast enough to perform human respiration monitoring through breath detection or real-time finger proximity monitoring via skin humidity sensing. This work describes chemiresistive graphene-based humidity sensors produced in few steps with facile liquid phase exfoliation followed by Langmuir–Blodgett assembly that enables active areas of practically any size. The graphene sensors provide a unique mix of performance parameters, exhibiting resistance changes up to 10% with varying humidity, linear performance over relative humidity (RH) levels between 8% and 95%, weak response to other constituents of air, flexibility, transparency of nearly 80%, and response times of 30 ms. The fast response to humidity is shown to be useful for respiration monitoring and real-time finger proximity detection, with potential applications in flexible touchless interactive panels.

1 Department for Architectural Structures and Building Technologies, Faculty of Architecture, University of Sarajevo, Patriotske lige 30., 71 000 Sarajevo, Bosnia and Herzegovina 2 Department of Cardiology, Pediatric Clinic, Clinical Center University of Sarajevo, Patriotske lige 81., 71 000 Sarajevo, Bosnia and Herzegovina, email: nedim_begic91@hotmail.com 3 Department of Cardiology, General Hospital "Prim.Dr. Abdulah Nakas", Kranjčevićeva 12., 71 000 Sarajevo, Bosnia and Herzegovina, email:edinbegic90@gmail.com 4 Department of Pharmacology, Sarajevo Medical School, Sarajevo School of Science and Technology, 71 000 Sarajevo, Bosnia and Herzegovina, email:edinbegic90@gmail.com 5 Faculty of Medicine, University of Tuzla, Univerzitetska 1., 75 000 Tuzla, Bosnia and Herzegovina, email: zumreta.kusljugic@ukctuzla.ba 6 Department for Pathophysiology, Faculty of Medicine, University of Sarajevo, Čekaluša 90, 71 000 Sarajevo, Bosnia and Herzegovina, email:damir.secic@mf.unsa.ba

Aluminum alloys are widely used in military and aviation industry due to their properties such as low density and high strength. During the aircraft operation there are mechanical failures of various structural components caused by numerous mechanisms such as corrosion, material defects, high cycle fatigue and the like. One of the frequent mechanical failures on air-cooled piston engines is the cylinder head cracking. This paper is the continuation a comprehensive research of the Lycoming IO-360-B1F aircraft cylinder head failure. The failure of this type has already occurred during flight and about 50 failures like this have been registered from around the world, some of them with a fatal outcome and therefore require detailed research. The paper consists of machining of the tested specimens and their testing at many different locations and in many different laboratories throughout Bosnia and Herzegovina, Serbia and Slovenia. This paper is based on a research that includes the experimental analysis of mechanical properties of Aluminum alloy 242.0 which is a constituent material of the cylinder head of the Lycoming IO-360-B1F aircraft engine on which a crack appeared. Based on chemical, metallographic, static and dynamic experimental tests of the material properties, Aluminum alloy 242.0 static and fatigue properties were obtained, S-N curve was formed and endurance limit was determined. Results of numerical simulations of experiments, confirmed by experimental results, were performed to make numerical procedures reliable due to further research. The results of the research are planned to be implemented in numerical modeling of the cylinder assembly stress-strain state under workload and in further numerical research of Lycoming IO-360-B1F cylinder assembly integrity assessment.

© The Author 2020. Published by ARDA. Abstract Clean water is essential to our existence and problems might arise when it becomes contaminated with different pathogens, which might pose a threat to human health. Tap water is generally considered drinkable since it passes different forms of disinfection during processing. Some households have additional disinfection procedures, the most common one being the usage of charcoal filters, in order to further clean the tap water from both undesirable solvents and microorganisms. In the first independent study of this kind, we have tested tap water for bacteria from five different locations in Sarajevo, and we have tested the efficiency of charcoal filter in trapping of bacteria. According to regulations in Bosnia and Herzegovina, there should be 1 colony forming unit (CFU) per 50ul of water sample, which was satisfied in only one location from Sarajevo, while one had significantly higher levels (6.7, p val. 0.0148). Overall, the charcoal filter has decreased the number of bacteria in the water, with the exception of one sample.

Bone plays critical roles in support, protection, movement, and metabolism. Although bone has an innate capacity for regeneration, this capacity is limited, and many bone injuries and diseases require intervention. Biomaterials are a critical component of many treatments to restore bone function and include non-resorbable implants to augment bone and resorbable materials to guide regeneration. Biomaterials can vary considerably in their biocompatibility and bioactivity, which are functions of specific material parameters. The success of biomaterials in bone augmentation and regeneration is based on their effects on the function of bone cells. Such functions include adhesion, migration, inflammation, proliferation, communication, differentiation, resorption, and vascularization. This review will focus on how different material parameters can enhance bone cell function both in vitro and in vivo.

The paper deals with a simplified assessment of distribution of Specific Absorption Rate averaged over a whole body (SARWB) for the human exposure to near RFiD reader antennas. SARWB is computed for various distances between the antenna and the user featuring parallelepiped model of the human body. The frequencies of interest are $f = 100$ kHz, $f = 13.56$ MHz, $f = 915$ MHz and $f = 2.4$ GHz, and the reader is assumed to radiate EIRP of 4 We.i.r.p.. The obtained results show that for distances between 1 cm and 2 m from the reader antenna SARWB values are below the allowed limit of 0.4 W/kg for workers.

Ambrosia artemisifolia (ragweed) is an invasive plant species with severe allergenic effects which quickly detects favorable growth conditions and represents a threat to the quality of plant communities. There are still unanswered questions to the allelopathic effects of ragweed on other species, which further complicates the understanding of its compatibility with other plants in both natural and agricultural environment. The paper monitors the allelopathic effects of the aqueous extract isolated from dry ragweed leaves (10, 5, 2.5 and 1.25%) on the germination and growth of corn and wheat. The aquaeous ragweed extracts reduced the germination of corn and wheat down to 70%. The seedling length was inhibited, especially in high concentrations. Wheat appeared to be more tolerant to the extract effect. Corn suffered a larger inhibition effect in terms of root length and seedlings, which suggested that this species was more sensitive. The obtained results imply that the ragweed should be combated in a timely manner in order to avoid its inhibitory effects on the indicator crops.

ABSTRACT As a main input for economic growth and competitiveness, foreign direct investments (FDI) remain one of the most important sources in both emerging and developing countries. This study emphasizes the importance of FDI into Serbia’s economy by analysing the forecasts between FDI, GDP, the unemployment rate and global competitive index (GCI). In this paper, authors focussed on a comparison of FDI inflows from China, Russia and the EU countries. According to the multiplicative and seasonal aspects of trend analysis considered, projections show a gradual increase in GDP, FDI, competitive ranks and a decrease in the unemployment rate for the following 5 years. These results shed light on the future potential directions under which investment and other public policies should be created. Theoretical and practical implications are also discussed.

Checkpoint inhibitors (CPIs) augment adaptive immunity. Systematic pan-tumor analyses may reveal the relative importance of tumour cell intrinsic and microenvironmental features underpinning CPI sensitization. Here we collated whole-exome and transcriptomic data for >1000 CPI-treated patients across eight tumor-types, utilizing standardized bioinformatics-workflows and clinical outcome-criteria to validate multivariate predictors of CPI-sensitization. Clonal-TMB was the strongest predictor of CPI response, followed by TMB and CXCL9 expression. Subclonal-TMB, somatic copy alteration burden and HLA-evolutionary divergence failed to attain significance. Discovery analysis identified two additional determinants of CPI-response supported by prior functional evidence: 9q34.3 (TRAF2) loss and CCND1 amplification, both independently validated in >1600 CPI-treated patients. We find evidence for collateral sensitivity, likely mediated through selection for CDKN2A-loss, with 9q34.3 loss as a passenger event leading to CPI-sensitization. Finally, scRNA sequencing of clonal neoantigen-reactive CD8-TILs, combined with bulk RNAseq analysis of CPI responding tumors, identified CCR5 and CXCL13 as T cell-intrinsic mediators of CPI-sensitisation.

We introduce a two-dimensional network model that realizes a higher-order topological insulator (HOTI) phase. We find that in the HOTI phase a total of 16 corner states are protected by the combination of a four-fold rotation, a phase-rotation, and a particle-hole symmetry. In addition, the model exhibits a strong topological phase at a point of maximal coupling. This behavior is in opposition to conventional network models, which are gapless at this point. By introducing the appropriate topological invariants, we show how a point group symmetry can protect a topological phase in a network. Our work provides the basis for the realization of HOTI systems in alternative experimental platforms implementing the network model.

Prikaz knjige

Water is an important component in every plant’s life helping them to perform basic metabolic processes. The biggest challenge of today’s agriculture is how to ensure sufficient water needs at the key phase of plant development and how they can use the available moisture in the soil through the rhizosphere system.

Autoritet je ključno profesionalno i osobno obilježje nastavnika. Nastavnik treba znati upravljati i voditi razredne i školske aktivnosti, biti stručnjak iz nastavnoga predmeta koji poučava, koristiti primjerene metode poučavanja, iskazivati razumijevanje prema svakom učeniku, a pritom imati i pozitivan utjecaj na učenike. U suvremenoj se pedagoškoj literaturi taj pojam sve rjeđe koristi. Promjene u odgoju i obrazovanju koje naglašavaju autonomiju učenika i stvaranje pogodnoga ozračja za učenje dovele su do narušavanja autoriteta nastavnika u razredu.Cilj je rada razmotriti stavove studenata pedagogije o autoritetu nastavnika u suvremenom pristupu odgoju i obrazovanju, otkriti njegove karakteristike i eventualne promjene tradicionalnoga shvaćanja autoriteta. U istraživanju su sudjelovali studenti pedagogije, a provedeno je  upitnikom otvorenoga tipa u kojemu su studenti iskazivali mišljenje o autoritetu nastavnika u učionici, obilježjima i značenju autoriteta. Rezultati su pokazali da studenti pedagogije autoritet nastavnika povezuju s tradicionalnim oblikom autoriteta, dajući mu  obilježja relacijskoga autoriteta, tj. u velikoj ga mjeri povezuju s odnosom nastavnika i učenika.