Flora Capture: a citizen science application for collecting structured plant observations.

Background: Digital plant images are becoming increasingly important. First, given a large number of images deep learning algorithms can be trained to automatically identify plants. Second, structured image-based observations provide information about plant morphological characteristics.

Coexistence of 3d-ferromagnetism and superconductivity in [(Li1-x Fex )OH](Fe1-y Liy )Se.

Superconducting [(Li1-x Fex )OH](Fe1-y Liy )Se (x≈0.2, y≈0.08) was synthesized by hydrothermal methods and characterized by single-crystal and powder X-ray diffraction.

Framework structures of interconnected layers in calcium iron arsenides.

The new calcium iron arsenide compounds Ca(n(n+1)/2)(Fe(1-x)M(x))(2+3n)M'(n(n-1)/2)As((n+1)(n+2)/2) (n = 1-3; M = Nb, Pd, Pt; M' = □, Pd, Pt) were synthesized and their crystal structures determined by single-crystal X-ray diffraction. The series demonstrates the structural flexibility of iron arsenide materials, which otherwise prefer layered structures, as is known from the family of iron-based superconductors. In the new compounds, iron arsenide tetrahedral layers are bridged by iron-centered pyramids, giving rise to so far unknown frameworks of interconnected FeAs layers.

Beta-Ca3N2, a metastable nitride in the system Ca-N.

The structural chemistry of calcium nitrides is represented by just two different intermediate phases: cubic Ca(3)N(2) (referred to as alpha-Ca(3)N(2), Mn(2)O(3) type structure) and Ca(2)N (CdCl(2) type structure). Other binary phases ("gamma-Ca(3)N(2)", "Ca(11)N(8)") have been proven to represent cyanamide nitrides, Ca(4)N(2)[CN(2)] and Ca(11)N(6)[CN(2)](2), respectively. The metastable nitride beta-Ca(3)N(2) is prepared either by reaction of freshly distilled calcium metal with nitrogen at 700 K, or by reaction of Ca(2)N with N(2) at 500 K.