Search Results

You are looking at 1 - 4 of 4 items for

  • Author or Editor: Ján Takács x
  • All content x
Clear All Modify Search

Retrofit of the old building stock presents a good possibility to reduce the energy consumption. However, as the envelopes of old buildings become tighter, a risk increases that the fresh outside air supplied to the indoor environment by natural infiltration can decrease below the amounts required for a comfortable indoor environment, especially in buildings where mechanical ventilation has not been installed. This study presents an efficient method to measure the ventilation intensity, demonstrated on a 40-years old high-rise office building after a complete envelope retrofit. The well-established tracer gas decay and tracer gas step-up method were employed to obtain the ventilation intensity, using the natural CO2 produced by the occupants as the tracer gas. The measured values of the air change rate were between 0.1 and 0.7 1/h for the simple façade, whereas it ranged from 0.2 to 0.5 1/h for the double skin façade, with the windows closed. The level of compliance with ventilation requirements varied, depending on the standard and the philosophy adopted.

Restricted access

Previous research describes social structure in which employees are embedded as one of the important determinants of intra-organizational career expectations. There are two contradictory arguments in the literature, however. First, social closure of informal relations is supposed to strengthen the intentions of staying. Second, the efficiency and effectivity of the individual social network is assumed to enhance in-house career expectations. This empirical study analyzed data from 44 R&D teams in the Netherlands. Multilevel analysis was used to separate individual and team influences. Results show that the prospects to stay in the R&D team are determined positively by social closure, whereas the expectation to stay in the organization is determined positively by the efficiency and effectivity of individual social networks. The conclusions highlight that different forms of social capital might be important for different types of career perspectives.

Restricted access

Creating of indoor environment in the work area in industrial buildings should be based on cooperation between heating and ventilation. However, practice shows that this is not truth in many cases. Both professions are many times designed separately. Result is their noncooperation leading to a mutual obstruction in terms of disposal location or functional operation of the systems. Creating a heating and ventilation system, which would both be designed in accordance with applicable legislation and it would create an optimal indoor environment for people in working area, to find solution in combination of radiant heating with ventilation air recovery unit.

Restricted access
Acta Veterinaria Hungarica
Authors: Krisztin Szőke, Attila D. Sándor, Sándor A. Boldogh, Tamás Görföl, Jan Votýpka, Nóra Takács, Péter Estók, Dávid Kováts, Alexandra Corduneanu, Viktor Molnár, Jenő Kontschán, and Sándor Hornok

Kinetoplastids are flagellated protozoa, including principally free-living bodonids and exclusively parasitic trypanosomatids. In the most species-rich genus, Trypanosoma, more than thirty species were found to infect bats worldwide. Bat trypanosomes are also known to have played a significant role in the evolution of T. cruzi, a species with high veterinary medical significance. Although preliminary data attested the occurrence of bat trypanosomes in Hungary, these were never sought for with molecular methods. Therefore, amplification of an approx. 900-bp fragment of the 18S rRNA gene of kinetoplastids was attempted from 307 ixodid and 299 argasid ticks collected from bats, and from 207 cimicid bugs collected from or near bats in Hungary and Romania. Three samples, one per each bat ectoparasite group, were PCR positive. Sequencing revealed the presence of DNA from free-living bodonids (Bodo saltans and neobodonids), but no trypanosomes were detected. The most likely source of bodonid DNA detected here in engorged bat ectoparasites is the blood of their bat hosts. However, how bodonids were acquired by bats, can only be speculated. Bats are known to drink from freshwater bodies, i.e. the natural habitats of B. saltans and related species, allowing bats to ingest bodonids. Consequently, these results suggest that at least the DNA of bodonids might pass through the alimentary mucosa of bats into their circulation. The above findings highlight the importance of studying bats and other mammals for the occurrence of bodonids in their blood and excreta, with potential relevance to the evolution of free-living kinetoplastids towards parasitism.

Open access