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Anomalous fading of IR-stimulated luminescence from feldspar minerals : some results of the study

100%

Molodkov A. , Jaek I. , Vasilchenko V.

tom Vol. 26

11-17

An increasing amount of evidence shows that the use of feldspars in luminescence dating may suffer from significant age underestimates, which are thought to result from anomalous fading. In the hope of finding a solution to the problem we undertook physical investigations of kinetics and temperature dependencies of tunnel afterglow of these minerals. As a result, the method of the direct detection of the tunnel transitions from the dosimetric traps is proposed. Some other relevant results obtained are also presented and discussed. Particularly, the probable reasons of absence of effects of anomalous fading in the feldspar samples investigated in the present work are elucidated.

The effect of composition and holding time on glaze production using basalt rock as a base

75%

Birawidha D. C. , Miswanto A. , Setiawan L. , Prakosa A. , Dani U. , Gunawan G. , Arianti E. , Karo-Karo P. , Nugroho T. , Hendronursito Y.

tom Vol. 60, iss. 1

art. no. 177640

This research studied the potential use of local basalt and feldspar from Lampung Province, Indonesia, as glaze materials. Frit(s) are composed of changing basalt-to-feldspar weight ratios of A (30:70), B (50:50), C (70:30), and D (100:0) w/w%. The added 20% boric acid to the total weight reduces the process temperature to 1,000oC with holding times of 1, 4, and 8 hr(s). Based on the chemical composition test of the specimen, the four variations of the sample have SiO2 content above 40%, and the average SiO2/Al2O3 ratio is 4 and 5, which is usually a low-alumina glaze that will cause a glossy effect and have an amorphous structure. At point 2theta 29o, amorphous forms. Quartz (SiO2), albite (NaAlSi3O8), anorthite (CaAl2Si2O8), and coesite (SiO2) phases were discovered in the glaze specimens. The anorthite phase in glass-ceramic glaze gives a transparent glaze color due to the amorphous glassy phase formed during heat treatment. The findings of this study suggest that local materials based on basalt and feldspar may be used as glaze materials to provide a smooth texture and surface; the glaze layer is evenly distributed, can follow the full surface contour of the test specimen, and has low porosity.

Ocena regionalnego zapotrzebowania na wybrane surowce ceramiczne w Polsce

63%

Lewicka E. , Galos K.

tom R. 52, nr 6

79-84

W artykule poddano ocenie wielkość zapotrzebowania regionalnego (tj. w poszczególnych województwach) na surowce ceramiczne użytkowane do produkcji wyrobów ceramiki szlachetnej i technicznej, tj. porcelany stołowej, porcelany elektrotechnicznej, płytek ceramicznych i ceramicznych wyrobów sanitarnych. Do podstawowych surowców ceramicznych zaliczyć należy iły biało wypalające się, kaoliny oraz surowce skaleniowe. Analizie poddano krajowe i zagraniczne źródła tych surowców, a także główne zakłady będące ich użytkownikami. Ustalono szacunkowe poziomy podaży i popytu na wymienione surowce w poszczególnych województwach, co pozwoliło na ocenę znaczenia przepływów tych surowców pomiędzy poszczególnymi regionami oraz z zagranicy.

The article evaluates the regional demand (i.e. in individual voivodeships) for the ceramic raw materials utilized in the production of ceramic goods such as chinaware, electrical porcelain, ceramic tiles and sanitaryware. The principal ceramic raw materials are: white firing clays, kaolin, and feldspar. Their domestic and foreign sources, as well as main plants utilizing these raw materials have been analyzed. Estimated volumes of demand and supply in particular voivodeships have been determined, what allowed for relevance of these raw materials flow among particular regions and from abroad.

Geochimie et mineralogie du loess de Moyenne Belgique orientale

63%

Juvigne E. , Moors C.

1995

tom 04'