Lajos Kátai

• Ludovika University of Public Service

On the occasion of building fires, the risk of smoke, which adversely influences escape conditions, must be minimised. One way to reduce the risk is, for example, to pressurise the escape route in order to limit the infiltration of smoke. Careful determination of the design parameters of the pressurisation system is of great importance. This study...

The use of disaster management command centres is typically implemented in a static way, however, the experiences of the past period have shown that for their effective operation, it is necessary to use solutions that enable the monitoring of events, as well as rapid relocation and deployment. An obvious solution for creating the aforementioned cap...

The risk of flammable dangerous liquids stored on the industrial premises escaping into the environment in the event of major industrial accidents must be minimized. Such a risk reduction result can be achieved by the use of safety barriers, such as a remediation bund area, which can retain, collect and store the released material. The careful dete...

Az iparbiztonsági szabályozásnak a katasztrófavédelem rendszerében történő fejlődése mintegy 25 évre tekint vissza Magyarországon. Jelen tanulmány célja - a képzés, felkészítés és oktatás - szemszögéből áttekinteni az iparbiztonsági szakterületek közül a veszélyes üzemek biztonságszervezésével és a veszélyes szállítmányok felügyeletével kapcsolatos...

A veszélyes anyagokkal kapcsolatos tevékenységek biztonságát az ipari forradalmak óta mára számos nemzetközi egyezmény garantálja, ugyanakkor a kockázat sosem csökkenthető nullára. Kiemelten igaz ez az áruk helyzetváltoztatásából adódó veszélyhelyzetek kialakulására, ahol rendkívül nehezen előrejelezhető a helyszín, az időpont és a következmény. Je...

The environmental effects of severe nuclear accidents pose a great threat to the environment and to living organisms. Unfortunately, there have been several examples of this over time. In our work, we present development solutions and opportunities which a nuclear power plant or other nuclear facility can implement nuclear environmental monitoring...

A szennyvíz tisztítás és hulladék gazdálkodás bizonyos hiányosságai miatt jelentős szennyező anyagok kerülhetnek felszíni vizekbe, környezetbe. Társadalmunk számára fontos ezen anyagok környezetbe kerülésének felmérése és kockázatának megítélése. A mikroszennyező anyagok és mikroműanyagok kibocsátásai, nagy részben ipari termeléshez és emberi felha...

Napjainkban különös fontossággal bír és egyben komplex feladatként jelentkezik a lakosság és a környezeti elemek magas fokú védelmének biztosítása. A cikksorozat első része a vasúti áruszállítás környezetbiztonsági aspektusainak azonosítását követően a vasúti közlekedés okozta környezetterhelés levegőszennyezési hatásainak vizsgálatával foglalkozot...

Napjainkban különös fontossággal bír és egyben komplex feladatként jelentkezik a lakosság és a környezeti elemek magas fokú védelmének biztosítása. Jelen publikáció a vasúti áruszállítás környezetbiztonsági aspektusainak azonosítását követően a vasúti közlekedés okozta környezetterhelés levegőszennyezési hatásainak vizsgálatával foglalkozik. A cikk...

It has not even been two years since disaster management took over the enforcement process of the transportation of dangerous goods by inland waterways. The international regulations of the transportation of dangerous goods by inland waterways are recorded in the European Agreement concerning the International Carriage of Dangerous Goods by Inland...

These days it is especially important, and a complex task at the same time, to protect human health and the environment at a high level. One of the most important elements of this protection policy is industrial safety, highlighted by the major accidents of recent years. Industrial safety embraces four special fields: the supervision of dangerous p...

Relationships among GH genotype (AluI polymorphism), parity, metritis and interval from calving to first ovulation, milk production and body condition score (BCS) loss were determined in dairy cows (n=307) on four large-scale farms in Hungary. Cows with systemic signs of puerperal metritis or mastitis were excluded. Time of the first postpartum (PP...

The triglyceride content of lipid depots associated with the current feeding level is the primary determinant of leptin gene expression and the circulating leptin level. In laboratory rodents and primates the plasma leptin is influenced also by the age, gender and physiological status (puberty, pregnancy, lactation, postpartum period), and by the h...

Mastitis-induced ovarian abnormalities were studied in a field trial. At 1-3 day after calving, > or = 2 parity cows not affected with chronic recurrent mastitis and yielding < 400,000/ml somatic cell count (SCC) individual milk in the previous lactation, were enrolled in the study. Thereafter milk samples were collected three times weekly for 95-1...

In the last few decades a continuous increase was observed in average milk production of dairy cows all over the world. Simultaneously, however, a dramatic decrease was seen in reproductive performance. This tendency is attributed to the increased incidence of bacterial complications in uterine involution, as well as to the high occurrence of ovari...

Transition from pregnancy to lactation in dairy cows involves considerable metabolic adaptation. Additional stress is incurred during infections such as periparturient mastitis. Multiparous Holstein-Friesian cows kept under normal production conditions (n = 15) were used to evaluate changes in circulating metabolite and hormone concentrations from...

In the third part of the review the failures of fertilization and the early embryonic development are summarized. The pathology of the inadequate luteal function is detailed.

The energy imbalance related predisposition to mastitis was studied in group-fed postpartum dairy cows (n = 333) kept in 4 large-scale units and producing milk of low somatic cell count (SCC). Blood samples were taken on Days 1-3 after calving for assaying some metabolites and hormones related to the negative energy balance (NEB). If mastitis was d...

The aim of the present study was to confirm earlier findings, obtained with a small number of animals, that gonadotropin-releasing hormone (GnRH) can shorten corpus luteum functional life when it is administered 24 h after cloprostenol (PG) treatments given 7-9 days after estrus. In addition, the effects of two treatments, PG alone or PG + GnRH giv...

The consequences of peri-parturient Monensin administration were studied in two dairy herds in ≥ 2 parity HF cows (1) calving in moderate body condition (score, BCS: 3.25-3.75) and producing ≥8500 kg FCM in the previous lactation (Herd K), as well as (2) in those being overfed before calving (BCS: ≥3.75), but producing less milk (5-8000 kg FCM) (He...

The postpartum changes in plasma leptin levels of dairy cows ovulated within 35 days after calving were compared to of those with delayed onset of cyclicity in two experiments. The cows were sampled for leptin, insulin, IGF-1, thyroid hormones (T4, T3, rT3), Cortisol and also for some metabolites (glucose, NEFA, BHB and TCH) on day 1-3 after calvin...

After giving an overview of the general pathology of endotoxin mediated diseases the authors summarize the endotoxin induced endocrine changes and their clinical consequences, with particular regard to reproduction. Forced, premature leuteolysis with formation of short-lived corpora lutea in cyclic non-pregnant individuals as well as with embryonal...

The Council Directive 96/82/EC on the control of major-accident hazards involving dangerous substances (so-called the Seveso II. Directive) requires the operator of the upper-tier establishment to prepare the safety report including the modelling of the concequences of industrial accidents. The authors have examined the methods applied in consequen...

Partial processes of an adiabatic expansion are analyzed, in particular those which under real conditions lead to losses and are useless for the refrigerating efficiency, and can be therefore neglected. Based on this analysis, a refrigerating cycle is evolved which is theoretically equivalent to the adiabatic expansion process but leads under real...