Termofizička svojstva serpentinita

In this article serpentinite from Banovina, Croatia, was studied. The antigorite is main mineral constituent of that rock. The dilatation curve shows that the first contraction of sample is coursed by dehydratation of antigorite at nearly 660°C. In spite of this, the second contraction of sample, which begines at nearly 860°C, is incident with olivine phase formation. The morphology of the serpentinite before and after thermal treatment was observed with the optical microscope. Image of serpentinite before thermal treatment is characterized by inclusions of olivine as primary mineral left as residue in process of serpentinization. Image of serpentinite after thermal treatment was changed by water disappear. The first thermal treated and than milled serpentinite has better properties than the first milled and than thermally treated serpentinite.U ovom radu istraživan je serpentinit s nalazišta na Banovini u Hrvatskoj. U toj mineralnoj sirovini prevladavajući mineral je antigorit. Dilatacijska krivulja ukazuje da je prva kontrakcija uzorka uzrokovana dehidratacijom antigorita na približno 660°C. Nasuprot tome, na drugu kontrakciju uzorka koja počinje pri približno 860°C utječe stvaranje olivina. Morfologija serpentinita prije i poslije termičke obradbe promatrana je optičkim mikroskopom. Izgled serpentinita prije termičke obradbe karakteriziran je uključcima olivina kao primarnog minerala zaostalog u procesu serpentinizacije. Izgled serpentinita poslije termičke obradbe promijenio se uslijed eliminacije vode. Prvo termički obrađen te potom mljeven serpentinit ima bolje karakteristike od prvo mljevenog, a potom termički obrađenog serpentinita

Uporaba dijatomejske zemlje u pripravi SiAlON praha

In this paper the SiAlON powder was prepared by carbothermal reduction and nitridation of diatomaceous earth. The origin of raw material was deposit Lučenec, in the central region of Slovak Republic. The aim was investigate potential use of this natural source as a main precursor for production of low-cost SiAlONs by carbothermal reduction and nitridation.U ovom je radu SiAlON prah pripravljen karbotermijskom redukcijom i nitridacijom dijatomejske zemlje. Porijeklo sirovine je nalazište Lučenec u središnjem dijelu Slovačke. Cilj rada bio je istražiti mogućnosti te prirodne sirovine kao ishodišta za dobivanje jeftinih SiAlON-a postupkom karbotermijske redukcije i nitridacije

Rasprostranjenost roda Daphne u Parku Prirode Medvednica (Hrvatska)

In order to develop the floristic map of Medvednica Nature Park, already existing data on the distribution of the genus Daphne were collected from literature and herbarium sources. Field observations were also carried out. Three species were recorded: Daphne blagayana Freyer, Daphne laureola L. and Daphne mezereum L. All recorded species have the IUCN status of endangered or low risk species. For the three species of the genus Daphne in Medvednica Nature Park, 159 localities were found and 124 (78%) of the localities were geocoded. The distribution of the species is presented on maps using a Central European grid for floristic mapping (MTB).U svrhu izrade florističke karte Parka Prirode Medvednica sabrani su postojeći podaci o rasprostranjenosti roda Daphne iz literaturnih i herbarskih izvora. Također su izvršena i terenska istraživanja. Zabilježene su tri vrste: Daphne blagayana Freyer, Daphne laureola L. i Daphne mezereum L. Sve zabilježene vrste prema IUCN kategorijama spadaju među ugrožene i nisko rizične vrste. Za ove tri vrste roda Daphne unutar Parka Prirode Medvednica ukupno je zabilježeno 159 lokaliteta od kojih je 124 (78%) lokaliteta geokodirano. Rasprostranjenost vrsta prikazana je kartama uz uporabu srednjoeuropske mreže za kartiranje flore (MTB)

Rasprostranjenost roda Impatiens u Parku Prirode Medvednica, Hrvatska

The flora research in Medvednica Nature Park has shown the presence of four species of the genus Impatiens: Impatiens balfourii Hooker f., I. glandulifera Royle, I. noli-tangere L. and I. parviflora DC. The species I. noli-tangere is the most widespread in the Park, while the other three species are registered for the first time. Distribution mapping was done by using the basic units of the Central European grid for floristic mapping (MTB).Analizom rezultata dosadašnjih florističkih istraživanja, za područje Parka Prirode Medvednica utvrđene su četiri vrste roda Impatiens: Impatiens balfourii Hooker f., I. glandulifera Royle, I. noli-tangere L. and I. parviflora DC. Najšire rasprostranjena vrsta je I. noli-tangere, dok su ostale tri vrste prvi put zabilježene za floru Parka. Kartiranje rasprostranjenosti obavljeno je na temelju osnovnih jedinica srednjoeuropske mreže za kartiranje flore (MTB)

Trave (Poaceae) Parka prirode Medvednica, Hrvatska

As a part of the study of Medvednica Nature Park flora, the distribution of the grass taxa has been studied. The floristic mapping resulted in the establishment of 100 grass taxa from 47 genera. The species Brachypodium sylvaticum was found to be the most widespread grass species in the Nature Park area. Twenty one species were recorded in one MTB 1/64 quadrant alone. The data on 31 taxa originate from earlier periods and their occurrence was not confirmed in the recent research. Grasses from Mount Medvednica can be assigned to 10 floral elements. Thirty five grasses which could be defined as ruderal, cultivated or weeds were found in Medvednica Nature Park. According to the Red Book of Vascular Flora of Croatia 14 species are threatened to some degree.U sklopu istraživanja flore Medvednice proučavana je rasprostranjenost vrsta iz porodice trava (Poaceae). Analizom rezultata dosadašnjih florističkih istraživanja ustanovljeno je 100 svojti trava iz 47 rodova. Vrsta Brachypodium sylvaticum je najrasprostranjenija, a 21 vrsta nađena je u samo jednom MTB 1/64 polju. Podaci o prisutnosti za 31 svojtu nisu potvrđeni našim terenskim istraživanjem. Trave Parka prirode Medvednica pripadaju u 10 flornih elemenata. Od ukupnog broja trava njih 35 se može označiti kao ruderalne, kultivirane ili korovne. Prema Crvenoj knjizi vaskularne flore Hrvatske 14 vrsta ima neki od stupnjeva ugroženosti

Određivanje izloženosti olovu i kadmiju putem zraka i hrane u stanovnika Zagreba

Exposure to lead and cadmium was monitored in a group of 17 non-smoking women in Zagreb. The monitoring included measurement of the intake of the two metals via air and the diet during a period of seven days. Duplicate daily diets and air filter samples were collected for analysis of lead and cadmium. To check the intake of lead and cadmium with the daily diet, faeces were collected and analysed. The mean gastrointestinal absorption was estimated to be 4.9 µg/day for lead and 0.75 µg/day for cadmium. These values were derived from faecal data which were assumed to be more reliable. The daily absorption through inhalation estimated on the basis of air analysis was 2.7 µg for lead and 0.03 µg for cadmium.Izloženost olovu i kadmiju mjerena je na skupini od 17 žena nepušačica u Zagrebu. Praćenje je uključivalo određivanje unosa ovih elemenata putem zraka i dnevne prehrane. Primijenjena je metoda „dvostrukih obroka“ i osobni sakupljači čestica zraka, uzastopce tijekom sedam dana. Kao kontrola unosa ovih elemenata putem hrane poslužilo je sakupljanje i analiza fekalija. Dobiveni rezultati upućuju na to da su vrijednosti dobivene iz fekalija pouzdanije te su one uzete za procjenu apsorpcije. Gastrointestinalna apsorpcija olova procijenjena je na vrijednost od 4,9 µg/dan, a kadmija na 0,75 µg/dan. Dnevno apsorbirana doze određena iz koncentracije elemenata u zraku daje vrijednost od 2,7 µg/dan za olovo, a 0,03 µg/dan za kadmij

Rasprostranjenost roda Daphne u Parku Prirode Medvednica (Hrvatska)

In order to develop the floristic map of Medvednica Nature Park, already existing data on the distribution of the genus Daphne were collected from literature and herbarium sources. Field observations were also carried out. Three species were recorded: Daphne blagayana Freyer, Daphne laureola L. and Daphne mezereum L. All recorded species have the IUCN status of endangered or low risk species. For the three species of the genus Daphne in Medvednica Nature Park, 159 localities were found and 124 (78%) of the localities were geocoded. The distribution of the species is presented on maps using a Central European grid for floristic mapping (MTB).U svrhu izrade florističke karte Parka Prirode Medvednica sabrani su postojeći podaci o rasprostranjenosti roda Daphne iz literaturnih i herbarskih izvora. Također su izvršena i terenska istraživanja. Zabilježene su tri vrste: Daphne blagayana Freyer, Daphne laureola L. i Daphne mezereum L. Sve zabilježene vrste prema IUCN kategorijama spadaju među ugrožene i nisko rizične vrste. Za ove tri vrste roda Daphne unutar Parka Prirode Medvednica ukupno je zabilježeno 159 lokaliteta od kojih je 124 (78%) lokaliteta geokodirano. Rasprostranjenost vrsta prikazana je kartama uz uporabu srednjoeuropske mreže za kartiranje flore (MTB)

The thermophysical properties of serpentinite

In this article serpentinite from Banovina, Croatia, was studied. The antigorite is main mineral constituent of that rock. The dilatation curve shows that the first contraction of sample is coursed by dehydratation of antigorite at nearly 660°C. In spite of this, the second contraction of sample, which begines at nearly 860°C, is incident with olivine phase formation. The morphology of the serpentinite before and after thermal treatment was observed with the optical microscope. Image of serpentinite before thermal treatment is characterized by inclusions of olivine as primary mineral left as residue in process of serpentinization. Image of serpentinite after thermal treatment was changed by water disappear. The first thermal treated and than milled serpentinite has better properties than the first milled and than thermally treated serpentinite

Određivanje izloženosti olovu i kadmiju putem zraka i hrane u stanovnika Zagreba

Exposure to lead and cadmium was monitored in a group of 17 non-smoking women in Zagreb. The monitoring included measurement of the intake of the two metals via air and the diet during a period of seven days. Duplicate daily diets and air filter samples were collected for analysis of lead and cadmium. To check the intake of lead and cadmium with the daily diet, faeces were collected and analysed. The mean gastrointestinal absorption was estimated to be 4.9 µg/day for lead and 0.75 µg/day for cadmium. These values were derived from faecal data which were assumed to be more reliable. The daily absorption through inhalation estimated on the basis of air analysis was 2.7 µg for lead and 0.03 µg for cadmium.Izloženost olovu i kadmiju mjerena je na skupini od 17 žena nepušačica u Zagrebu. Praćenje je uključivalo određivanje unosa ovih elemenata putem zraka i dnevne prehrane. Primijenjena je metoda „dvostrukih obroka“ i osobni sakupljači čestica zraka, uzastopce tijekom sedam dana. Kao kontrola unosa ovih elemenata putem hrane poslužilo je sakupljanje i analiza fekalija. Dobiveni rezultati upućuju na to da su vrijednosti dobivene iz fekalija pouzdanije te su one uzete za procjenu apsorpcije. Gastrointestinalna apsorpcija olova procijenjena je na vrijednost od 4,9 µg/dan, a kadmija na 0,75 µg/dan. Dnevno apsorbirana doze određena iz koncentracije elemenata u zraku daje vrijednost od 2,7 µg/dan za olovo, a 0,03 µg/dan za kadmij