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Abstract

With the continuous development of society and cities, people’s demand for urban public space is constantly changing, and the methods for public space renewal are becoming more and more diverse. As a flexible space renewal strategy, street art activities can not only partially update the space, increase the vitality of the space, but also improve the quality of the space and meet people’s needs. This paper first discusses the concepts and types of street art and clarifies the scope of research, Then, through the analysis of the role and impact of “street art activities intervening in urban space”, and finally summing up the relevant enlightenment, to create a favorable material environment for the future art intervention space.

Open access

Abstract

Castellated beams are made from a hot rolled steel I-section in a few steps. Firstly, the web of the parent I-section is cut in a particular zigzag pattern and the two halves are reconnected by welding to form a castellated beam with hexagonal openings. In other cases, a spacer plate is placed between the two halves to produce octagonal openings, which increase the section depth. Increasing the depth by adding spacer plates leads to web-post buckling. This study focuses on improving the castellated beam to obtain high strength with relatively low cost by placing a steel ring inside the octagonal openings to strengthen the weakest part, which is its web. The results show that the steel ring is effective in strengthening the web-post.

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Abstract

Because of the wide variety of possible application fields and the spread of smart devices, the research of wireless sensor networks has become an increasingly important area in the last decade. During the design of these networks, several important aspects have to be considered, for example the lifetime of the network, expected battery usage, or robustness of the installed system. In this paper a simulation environment is introduced that enables the testing of different information spreading methods on the network and provides suggestions for gateway placements with different objectives.

Open access

Abstract

Cold asphalt emulsion mixtures are produced at ambient temperature and it have several advantages i.e., energy savings, safety and reducing CO2 emission during manufacturing and construction, reduction of adverse environmental impact. Cement kiln dust is a fine powdery substance with appearance similar to Portland cement that is generated as a by-product material of cement manufacturing industry. The aim of this research is addition of cement kiln dust instead of Portland cement as filler in asphalt emulsion mixtures. Cement kiln dust was added with 2, 4, 6, and 8% from total weight of aggregate to improve the mechanical properties and durability of this mixture. The results were very positive and encouraging, due to the improvement of the mechanical properties and durability of the mixtures.

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Pollack Periodica
Authors: Ivan Baláž, Yvonna Koleková, Lydia Moroczová, and Antonio Agüero

Abstract

Eurocodes give guidance how to design built-up columns having effective bending stiffness, smeared shear stiffness and local bow imperfection amplitude e0 = L/500 under compression. The guidance is valid only for columns supported by hinges at their ends. The second order theory is presented, which allows analysis of the battened and laced built-up columns with initial imperfection under combined compression and bending with the bottom end fixed and the upper one free in the case of in-plane buckling. The application of the theory in several numerical examples is given in Part II.

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Abstract

The congested traffic flow is significantly different from both the free flow and the non-congested but limited flow. Two of those differences are in the merging and crossing movements. Based on the conducted measurements, this movement could be up to 10 times faster in the congested condition. Another important feature is the giveway gestures. It was found that the vast majority of the gaps needed to merge or cross are not generated by the traffic dynamic, but created by the arterial road's drivers in the interactions with drivers wishing to merge or cross.

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Pollack Periodica
Authors: Bode Venkata Kavyateja, J. Guru Jawahar, Chundupalle Sashidhar, and Narasimha Reddy Panga

Abstract

This paper analyses the structural behavior of reinforced self-compacting concrete beams under two-point loading. A total number of five beams were cast with varying quantities of alccofine (i.e., 0, 5, 10, and 15%) and constant dosage of fly ash (i.e., 25%) and tested for examining the load-deflection curves and ultimate moment carrying capacity of reinforced self-compacting concrete beams. From obtained experimental results, it was found that the load-carrying capacity was increased when the beam with the addition of alccofine and fly ash is compared with the normal concrete beam. The experimental obtained ultimate strength values were compared with theoretically predicted values using IS 456-2000, ACI 318-11, and CSA A23.3-04 codes.

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Abstract

Several types of punching shear reinforcements are available for increase of the maximum resistance against punching shear failure of flat slabs. Conventional punching shear reinforcement in form of stirrups or double headed studs are in use for decades. They are well known due to their simplicity and good performance. A new type of punching reinforcement has been developed for the case, where the flat slab exposed to extreme load and resistance of conventional type of punching shear reinforcement is not sufficient. Another designs point out that new construction system can reduce the amount of CO2. This paper presents some results of parametric study focused on design of the flat slab using different types of punching shear reinforcement and considering the concrete consumption.

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Abstract

Watermills in Kosovo have been for centuries a characteristic element of river valley landscapes and have played a very important socio-economic role in the country. Although nowadays some preserved and functioning watermills exist, most of them are abandoned, destroyed, and many with very few remains to trace. This research aims to identify and describe the current state of the watermills in the western part of the Lipjan Municipality, as well as to mark them on a geographic information system map. This study examines the possibility of restoring these mills to their original function or adapting them to a new function. The study sampled one of the identified mills, analyzed its characteristics, and the possibility of restoration and preservation for tourism and cultural heritage purposes.

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Acta Alimentaria
Authors: Cs. Dobolyi, K. Inotai, I. Bata-Vidács, D. Sárkány, O. Csernus, S. Kocsubé, B. Tóth, A. Szekeres, and J. Kukolya

Abstract

Aspergillus strains were isolated from Hungarian mills in order to get information on the appearance of sterigmatocystin (ST) producing moulds, whose presence has never been demonstrated in Hungary. Fungal isolates were classified into nine morphotypes, sections Nigri, Nidulantes, Versicolores (two morphotypes), Circumdati, Flavi (two morphotypes), Clavati and Terrei by classical mycological assays. ST producing strains could be classified into section Versicolores. ST production of the isolates was assessed by liquid and solid phase growth experiments and compared to ST producing reference strains: Aspergillus pepii SzMC 22332, Aspergillus versicolor SzMC 22333, Aspergillus griseoaurantiacus SzMC 22334 and Aspergillus nidulans RDIT9.32. Four of our isolates marked as Km11, Km14, Km26 and Km31 showed ST production in liquid medium. ST production on solid phase corn grit substrate was measured after three weeks of incubation, and Km26 isolate proved to be the most prominent with a toxin concentration of 277.1 μg g−1, surpassing all reference strains. The toxin-producing ability of Km26 isolate was also tested in a field experiment, where corn was infected. By the end of the experiment, ST level of 19.56 μg kg−1 was measured in infected corn.

Molecular taxonomic identification of the Km26 strain was performed using internal transcribed spacer (ITS), calmodulin and tubulin sequence analyses. Based on these studies, strain Km26 was identified as Aspergillus creber.

Here we report that an ST-producing A. creber strain has appeared in Hungary, and the Km26 strain is the first known extreme ST-producing mould in this country. As a result of climate change, aflatoxin B1 producing Aspergillus flavus strains have appeared in Hungary in the last decade. As strain Km26 is the only A. creber isolate in Hungary so far, there is no sign of mass prevalence, and due to the lower temperature optimum of the species compared to A. flavus, its appearance is probably not related to climate change.

Open access