Pyrazino[2,3-b]indolizine-10-carbonitrile

In the crystal structure of the title compound, C11H6N4, neighbouring mol­ecules are linked into inversion dimers through pairs of weak C—H⋯N hydrogen bonds, forming an R 2 2(10) ring motif. The dimers forming this motif are further linked by π–π inter­actions. With respective average deviations from planarity of 0.004 (2) and 0.004 (1) Å, the pyrazino[2,3-β]indolizine and cyano fragment are oriented at 0.8 (1)° to each other. The mean planes of the pyrazino[2,3-b]indolizine skeleton either lie parallel or are inclined at an angle of 28.7 (2)° in the crystal

2-(3-Chloro-1,2-dihydro­pyrazin-2-yl­idene)malononitrile

In the crystal structure of the title compound, C7H3ClN4, neighbouring mol­ecules are linked via pairs of N—H⋯N hydrogen bonds into inversion dimers, thereby forming an R 2 2(12) ring motif. With respective average deviations from planarity of 0.009 (1) and 0.006 (1) Å, the pyrazine skeleton and the malononitrile fragment are oriented at an angle of 6.0 (1)° with respect to each other. The mean planes of the pyrazine ring lie either parallel or are inclined at an angle of 68.5 (1)° in the crystal structure

The Former Gestapo Headquarters and the Provincial Office of Public Security in Anstadt Avenue in Łódź Interdisciplinary Site Research

The paper discusses the research me­thods and the most important results of the interdisciplinary project “The Former Gestapo Headquarters and the Provincial Office of Public Security in Anstadt Avenue in Łódź. Interdisciplinary Site Research” conducted in 2019–2021. Considering the challenges faced by the archaeology of the contemporary past, a subdiscipline of archaeology, an attempt was made to link the results of archaeological research to the relatively well-known historical context of structural and functional transformations of the site explored, mostly the establishment of a Jewish school in Anstadt Avenue at the end of the 1930s, the operation of the Gestapo headquarters during the Second World War and of the communist Provincial Office of Public Security after the war, and the division of the site into police and school sections in 1957, which has been preserved to date. Also ethno­graphic research was carried out, which identified sources referring to the forms of remembrance and commemoration of places, events, and people. The Authors hope that the archaeological research will be soon resumed on account of the planned investments, allowing to publish a complementary and interdisciplinary monograph of the site explored

Methyl 7-meth­oxy-9-oxo-9H-xanthene-2-carboxyl­ate

The crystal structure of the title compound, C16H12O5, is stabilized by C—H⋯O hydrogen bonds and C=O⋯π inter­actions; π–π inter­actions are also present. With respective average deviations from planarity of 0.003 (2) and 0.002 (1) Å, the xanthone and ester fragments are oriented at an angle of 2.8 (2)° with respect to each other. The mean planes of the xanthone skeleton lie either parallel to each other or are inclined at an angle of 85.5 (2)° in the crystal structure

1,8-Bis(tosyloxy)-9,10-anthraquinone

In the crystal structure of the title compound, C28H20O8S2, adjacent anthracene skeletons are parallel or inclined at an angle of 20.6 (1)°. In the molecular structure, the mean plane of the anthracene skeleton makes dihedral angles of 49.6 (1) and 76.8 (1)° with the tosyl rings, and the two terminal benzene rings are oriented at an angle of 74.5 (1)° with respect to each other. The crystal structure is stabilized by intermolecular C—H...O and C—O...π interactions

Spotpriset på el - Vilken påverkan har utsläppsrätterna på elpriset?

Syftet med den här uppsatsen är att undersöka hur priset på utsläppsrätter påverkar priset på el. Det teoretiska huvudperspektivet utgörs av hur elprisets marginalkostnadsprissättning påverkas av utsläppsrätter. Vår undersökning visar att utsläppsrätterna har en signifikant påverkan på elpriset under den period vi har valt att undersöka. Vår slutsats är att handeln med utsläppsrätter ökar elpriset med 2,7 öre/kWh då utsläppsrätterna kostar 20 euro/ton