Magmatic anhydrite and calcite in the ore-forming quartz-monzodiorite magma at Santa Rita, New Mexico (USA): genetic constraints on porphyry-Cu mineralization

ISSN:0024-493

Phase formation during liquid phase sintering of ZnO ceramics

ZnO doped with Bi$_2$O$_3$ and Sb$_2$O$_3$ (ZBS), is the basic system for ceramic varistors. Phase formation during sintering of ZBS was measured in situ, using 1 mm thick samples and synchrotron X-rays. Sintering shrinkage was measured in different atmospheres by an optical method. Thermodynamic calculations were performed to explain phase formation, composition, stability of additive oxides and influence of the oxygen fugacity on sintering. Sb$_2$O$_4$, pyrochlore, trirutile and spinel were formed at temperatures of 500–800 °C. The oxidation of antimony was controlled by the oxygen partial pressure and affected both, phase formation and sintering kinetics, in the ZBS system

Iron-Carbon interaction at High Pressures and Temperatures

International audienceWe have performed experiments in the Fe–C system at 2200–3400 K and 25–70 GPa using a multianvil press and laser-heated diamond anvil cell in order to constrain the stability of Fe3C. Iron carbide was observed experimentally as a stable phase using both experimental methods and independently confirmed by thermodynamic calculations. Our results imply that pure iron and carbon cannot coexist in a stable equilibrium at high pressure and high temperature. The high reactivity between metallic iron and the diamond requires a careful design of diamond anvil cell experiments in order to avoid carbon transport to the sample

Application of the Cox proportional hazards model and competing risks models to critical illness insurance data

A commercial insurance company in the Czech Republic provided data on critical illness insurance. The survival analysis was used to study the influence of the gender of an insured person, the age at which the person entered into an insurance contract, and the region where the insured person lived on the occurrence of an insured event. The main goal of the research was to investigate whether the influence of explanatory variables is estimated differently when two different approaches of analysis are used. The two approaches used were (1) the Cox proportional hazard model that does not assign a specific cause, such as a certain diagnosis, to a critical illness insured event and (2) the competing risks models. Regression models related to these approaches were estimated by R software. The results, which are discussed and compared in the paper, show that insurance companies might benefit from offering policies that consider specific diagnoses as the cause of insured events. They also show that in addition to age, the gender of the client plays a key role in the occurrence of such insured events.Komerční pojišťovna působící v České republice poskytla údaje o pojištění závažných onemocnění. Analýza přežití byla využita ke zkoumání vlivu pohlaví pojištěného, ​​věku, kdy osoba uzavřela pojistnou smlouvu, a regionu, kde pojištěný žil, na vznik pojistné události. Hlavním cílem výzkumu bylo zjistit, zda je vliv vysvětlujících proměnných odhadován odlišně při použití dvou různých přístupů. Byly použity přístupy (1) Coxův model proporcionálního rizika, který nepřiřazuje konkrétní příčinu, jako je určitá diagnóza, pojistné události kritického onemocnění, a (2) modely konkurujících rizik. Regresní modely související s těmito přístupy byly odhadnuty pomocí softwaru R. Výsledky, které jsou v příspěvku diskutovány a srovnávány, ukazují, že pojišťovny by mohly mít prospěch z nabídky pojistek, které berou jako příčinu pojistných událostí konkrétní diagnózu. Ukazují také, že klíčovou roli při vzniku takových pojistných událostí hraje kromě věku i pohlaví klienta

Czech version of the self-curiosity attitude-interest scale (Scis), and its use in adolescents: Pilot applications, psychometric properties and normative study

Objectives. The purpose of this study was to verify the factor structure of the Czech translation ofin Self-CuriosityCzech grammarAttitude-Interestschools, studentsScaleand(SCAI)to explore reliability of the scale. Curiosity about self was initially conceptualized as the desire that people have to explore and understand themselves and their psychological functioning beyond what they already know about themselves. Sample and setting. A total of 2356 Czech adolescents, aged 15\u201319, who studied grammar school participated in the study. The research sample consisted of 1406 female students and 950 male students. The sample covered 2,75% of the Czech adolescent population at grammar schools. Statistical analysis. Confirmatory factor analysis was used to verify the factor structure of the Self-Curiosity Attitude-Interest Scale. Omega coefficients were used as the estimates of reliability. Results. CFA confirmed two-factor structure of the Czech version of Self-Curiosity Attitude-Interest Scale. Reliability reaches a value of 0.72. Study limitation. The construct validity of the SCAI-CZ was taken over from the study published by the authors of the scale