Microscopic analysis of the chemical reaction between Fe(Te,Se) thin films and underlying CaF2_2

To understand the chemical reaction at the interface of materials, we performed a transmission electron microscopy (TEM) observation in four types of Fe(Te,Se) superconducting thin films prepared on different types of substrates: CaF2 substrate, CaF2 substrate with a CaF2 buffer layer, CaF2 substrate with a FeSe buffer layer, and a LaAlO3 substrate with a CaF2 buffer layer. Based on the energy-dispersive X-ray spectrometer (EDX) analysis, we found possible interdiffusion between fluorine and selenium that has a strong influence on the superconductivity in Fe(Te,Se) films. The chemical interdiffusion also plays a significant role in the variation of the lattice parameters. The lattice parameters of the Fe(Te,Se) thin films are primarily determined by the chemical substitution of anions, and the lattice mismatch only plays a secondary role.Comment: 30 pages, 9 figur

Pure nematic state in iron-based superconductor

Lattice and electronic states of thin FeSe films on LaAlO$_3$ substrates are investigated in the vicinity of the nematic phase transition. No evidence of structural phase transition is found by x-ray diffraction below $T^\ast \sim 90$ K, while results obtained from resistivity measurement and angle-resolved photoemission spectroscopy clearly show the appearance of a nematic state. These results indicate formation of a pure nematic state in the iron-based superconductor and provide conclusive evidence that the nematic state originates from the electronic degrees of freedom. This pure nematicity in the thin film implies difference in the electron-lattice interaction from bulk FeSe crystals. FeSe films provide valuable playgrounds for observing the pure response of "bare" electron systems free from the electron-lattice interaction, and should make important contribution to investigate nematicity and its relationship with superconductivity

Dark matter wants Linear Collider

One of the main purposes of physics at the International Linear Collider (ILC) is to study the property of dark matter such as its mass, spin, quantum numbers, and interactions with particles of the standard model. We discuss how the property can or cannot be investigated at the ILC using two typical cases of dark matter scenario: i) most of new particles predicted in physics beyond the standard model are heavy and only dark matter is accessible at the ILC, and ii) not only dark matter but also other new particles are accessible at the ILC. We find that, as can be easily imagined, dark matter can be detected without any difficulties in the latter case. In the former case, it is still possible to detect dark matter when the mass of dark matter is less than a half mass of the higgs boson

Efeito da adição de farinha de cotilédones de feijão-caupi nas propriedades tecnológicas de biscoitos.

Na publicação: Kaesel Jackson Damasceno-Silva

PROPRIEDADES FÍSICAS DO SORVETE DE BAUNILHA ELABORADO COM SUBSTITUTOS DE GORDURA E SACAROSE

Sorvetes de baunilha preparados com substitutos de gordura (3-5%) e de sacarose (6-10%) foram comparados, mediante análises físicas e calóricas, com sorvete convencional. A combinação de 4% de Simplesse e 8% de Litesse evidenciaram efeito sinergístico para retardar a velocidade de fusão. Menores valores de densidade aparente e maior redução calórica foram obtidos com concentrações próximas a 3 e 6% (p/p) de Simplesse e Litesse, respectivamente. Baixas concentrações de Litesse (6%, p/p) e altas de Simplesse (5%, p/p) resultaram em maior tempo de início de fusão. A utilização desses substitutos permitiu a obtenção de produtos com baixos teores calórico e de gordura e características físicas semelhantes às de sorvete convencional. PHYSICAL PROPERTIES OF VANILLA ICE CREAM PREPARED WITH FAT AND SUCROSE SUBSTITUTES Abstract Prepared vanilla ice creams with fat (3-5%) and sucrose (6-10%) substitute were compared through physical and caloric analyses to conventional ice cream. The combination of 4% of Simplesse and 8% of Litesse showed sinergistic effect to delay the melting speed. Lower overrun and higher caloric reduction values were obtained with concentrations at 3 and 6% (p/p) of Simplesse and Litesse, respectively. Low concentrations of Litesse (6%, p/p) and high of Simplesse (5%, p/p) resulted in higher melting start time. The use of these substitutes allowed to obtain products with low calorie degree and of fat with physics characteristics similar to the standard ice cream

Extractability and chemical forms of radioactive cesium in designated wastes investigated in an on-site test

In the aftermath of the 2011 accident at Fukushima Daiichi Nuclear Power Plant (F1 hereafter), municipal solid waste (MSW) contaminated with radioactive cesium (rad-Cs hereafter) has been generated in 12 prefectures in Japan. The Japanese Minister of Environment classified MSW that contained rad-Cs in the concentration more than 8,000 Bq/kg as “designated (solid) waste (DSW hereafter), and prescribed the collection, storage and transportation procedures. When MSW containing rad-Cs was incinerated, rad-Cs was concentrated in fly ash, and the ash often fell into the category of DSW. We have investigated a technique that can reduce the volume of the rad-Cs-contaminated fly-ash by extracting rad-Cs with aqueous solvents such as water and oxalic acid and concentrating rad-Cs in a small amount of hexacyanoferrate (or ferrocyanide, designated as Fer hereafter) precipitate. Since DSW could not be transported to the outside laboratory, we have conducted on-site tests at places where DSW were generated to investigate the applicability of the extraction – precipitation technique. The present report is a summary of our most recent on-site test conducted in 2014. Also presented is the re-evaluation of the results of our past on-site test from the viewpoint of leaching of rad-Cs and heavy metals in the fly ash. An apparent decrease in leaching of rad-Cs from fly ash was observed by incinerating sewage sludge with soil. Fly ash from a melting furnace contained more water-soluble rad-Cs than that from a fluidized-bed incinerator. Some incinerator fly ash appeared to produce rad-Cs in colloidal form when extracted with oxalic acid, resulting in the lower removal of rad-Cs from the extract by Fer method. © The Editor(s) if applicable and the Author(s) 2016