Synthesis of ammonium silicon fluoride cryptocrystals on silicon by dry etching

Cryptocrystal layers of ammonium silicon fluoride (NH4)2SiF6 were grown on silicon wafers by dry etching using the vapors of HF:HNO3 solution at room temperature. As-grown layers are composed of white granular crystalline film with thicknesses of up to 8 micrometer which were synthesized with growth rates of around 1 micron/hour. The crystallinity was analysed by X-ray diffraction which indicates an isometric hexoctahedral system(4/m -32/m) with Fm3m space grouping of (NH4)2SiF6 cryptohalite crystals. These results have been confirmed by the presence of the vibrational absorption bands of (NH4)2SiF6 species by FTIR transmission. Strong absorption bands were observed in the infrared at 480cm-1, 725cm-1, 1433cm-1 and 3327cm-1 and assigned to N-H and Si-F related vibrational modes of (NH4)2SiF6. Annealing above 150oC leads to the formation of individual crystals with sizes up to 20 micrometer on the surface, thus indicating the posibility of forming solid compound layers with fine grain sizes on silicon.Comment: 13 pages, 4 figure

The relationship between electrical conductivity and magnetically damped motion

Varying electrical conductivities of different, non-magnetic metals appears to affect the magnitude of magnetically damped motion. To determine the relationship between magnetic damping and conductivity an experiment was designed using different length tubes of aluminium, copper and brass. The tubes had the same diameter and similar wall thickness. A short, cylindrical neodymium magnet was dropped through the tubes of and the time for the magnet to traverse the tube was recorded using a smartphone camera. These times allowed for the terminal velocity to be calculated for each metal length and the average terminal velocity for each metal was determined. This data was then processed to compare the terminal velocity with known conductivity values. The relationship between the terminal velocities of aluminium, brass and copper and their respective conductivities was found to be inversely proportional; as conductivity increases, terminal velocity decreases. Through this relationship, copper was identified as most effective in magnetically damping motion, exhibiting the largest terminal velocity of all metals and the highest conductivity

Provjera identiteta osoba

Provjera identiteta osoba spada među najčešće i najvažnije ovlasti koje primjenjuju policijski službenici tijekom obavljanja policijskih poslova. Uz provjeru identiteta, među najvažnije (možemo ih nazvati i primarne) policijske ovlasti spadaju davanje upozorenja i naredbi građanima, pregled osoba, predmeta i prometnih sredstava, uporaba sredstava prisile te dovođenje i privođenje. Provjera identiteta je gotovo uvijek prvi korak kod provođenja svih policijskih ovlasti, mjera i radnji. Bez provjere identiteta ne možemo otkloniti dvojbu je li nam neka osoba opravdano sumnjiva ili smo krivo prosudili. Bez provjere identiteta policijski službenik ne smije osobi uručiti poziv, nalog za dovođenje, privesti je, uhititi, zadržati je ili provesti bilo koju drugu policijsku ovlast. Provjera identiteta je nužna radi podnošenja potrebnih pisanih izvješća i obrazaca tijekom ili nakon provedene policijske ovlasti; izvješća o događaju, službene zabilješke, raznih potvrda, zapisnika, optužnog prijedloga, kaznene prijave i drugih pisanih podnesaka

The relationship between electrical conductivity and magnetically damped motion

Varying electrical conductivities of different, non-magnetic metals appears to affect the magnitude of magnetically damped motion. To determine the relationship between magnetic damping and conductivity an experiment was designed using different length tubes of aluminium, copper and brass. The tubes had the same diameter and similar wall thickness. A short, cylindrical neodymium magnet was dropped through the tubes of and the time for the magnet to traverse the tube was recorded using a smartphone camera. These times allowed for the terminal velocity to be calculated for each metal length and the average terminal velocity for each metal was determined. This data was then processed to compare the terminal velocity with known conductivity values. The relationship between the terminal velocities of aluminium, brass and copper and their respective conductivities was found to be inversely proportional; as conductivity increases, terminal velocity decreases. Through this relationship, copper was identified as most effective in magnetically damping motion, exhibiting the largest terminal velocity of all metals and the highest conductivity

Chatbots’ extroverted or introverted personality’s influence on consumers’ purchase intention depending on consumers’ extroversion extent

The purpose of this study is to investigate the influence of chatbot personality on consumer purchase intention, depending on the consumer's level of extroversion. Through an experiment, this study will analyze the effects of extroverted and introverted chatbot personalities on consumers with different levels of extroversion. The findings will provide valuable insights into the impact of chatbot personality on consumers’ purchase intention and the potential for personalized communication strategies in e-commerce. Results indicate that chatbot perception significantly influences purchase intention and that a match in personality between the chatbot and the consumer leads to higher purchase intention. Additionally, extroverted chatbots are found to lead to higher purchase intention than introverted ones. Finally, perceived ease of chatbot use is shown to increase purchase intention. These findings suggest that providing chatbots with a personality can effectively enhance purchase intention, particularly if matching the consumer’s personalityO objectivo deste estudo é investigar a influência da personalidade do chatbot na intenção de compra do consumidor, dependendo do nível de extroversão do consumidor. Através de uma série de experiências, este estudo irá analisar os efeitos de personalidades extrovertidas e introvertidas de chatbots sobre consumidores com diferentes níveis de extroversão. Os resultados proporcionarão valiosos conhecimentos sobre o impacto da personalidade de chatbot na intenção de compra dos consumidores e o potencial para estratégias de comunicação personalizadas no comércio electrónico. Os resultados indicam que a percepção do chatbot influencia significativamente a intenção de compra e que uma correspondência na personalidade entre o chatbot e o consumidor leva a uma maior intenção de compra. Além disso, verifica-se que os chatbots extrovertidos levam a uma intenção de compra mais elevada do que os introvertidos. Finalmente, a percepção de facilidade de utilização do chatbot é aumenta a intenção de compra. Estas conclusões sugerem que dar uma personalidade aos chatbots pode efectivamente aumentar a intenção de compra

Fresh versus frozen-thawed blastocyst transfer in high responders

Objective: This study aimed to investigate and compare the pregnancy and live birth rates in IVF cycles of frozen-thawed embryo transfers and fresh embryo transfers in a group of women with a high risk of Ovarian hyperstimulation syndrome (OHSS). Material and methods: The study group consisted of 254 women with a high level of response to controlled ovarian hyperstimulation. The patients who received fresh cycle embryo transfers with calcium infusions are referred to as the Fresh Ca+ group, and those without the calcium therapy are called the Fresh Ca- group; and we used correspondingly similar terminology for the Frozen group. Results: We observed no statistically significant differences between the cycles of fresh and frozen-thawed embryo transfers in patients with a high risk of OHSS in terms of implantation, clinical pregnancy, and live birth rates. Furthermore, these implantation, clinical pregnancy and live birth rates were not different in the cycles with or without calcium treatment. There was no statistical difference in the OHSS rates between the fresh and frozen-thawed cycles; although, the OHSS rates were less in the two calcium infusion groups (Fresh Ca+ and Frozen-thawed Ca+) than in the without-calcium group. There was no OHSS development in the subjects of the Frozen-thawed Ca+ group. Conclusion: Our study results suggest that fresh and frozen-thawed embryo transfers have similar IVF results in patients with a high risk of OHSS. Calcium infusion is beneficial in preventing OHSS without altering pregnancy rates. Both IVF protocols with calcium infusion can safely be applied in high-responder patients without lowering success rates