Origami is an ancient art form and can be divided into rigid non-rigid origami. Rigid origami suitable for the design of building structures because panels are not twisted deformed during folding process. Currently, generally built with steel. However, compared natural, non-polluting wood, steel has a high energy consumption environmental impact. Based on this situation, paper designs developab...

This paper presents a novel unified theory of the structure activity relationship of opioids and opioid peptides. It is hypothesized that a virtual or known heterocyclic ring exists in all opioids which have activity in humans, and this ring occupies relative to the aromatic ring of the drug, approximately the same plane in space as the piperidine ring of morphine. Since the rings of morphine a...

We first give an example of a rigid structure of computable dimension 2 such that the unique isomorphism between two non-computably isomorphic computable copies has Turing degree strictly below 0′′, and not above 0′. This gives a first example of a computable structure with a degree of categoricity that does not belong to an interval of the form [0(α),0(α+ 1)] for any computable ordinal α. We t...

α-Fluoroenamides, potent rigid fluorinated bioisosters of ureas, have been synthesized by a highly regio- and stereo-selective hydrofluorination of ynamides in anhydrous HF. This reaction provides the first general entry to α-fluoroenamides and can easily be applied to a wide range of substrates.

We study non-abelian monogenic algebraic number fields (i.e., non-abelian number fields whose rings of integers have a basis of the form {1, α, α, . . . , αn−1} for some α). There are numerous results about abelian monogenic number fields, yet for the non-abelian case little is understood. As our main result, we find an infinite family of non-abelian monogenic degree 6 number fields.

The title compound, C(17)H(22)O(2), was semi-synthesized from a mixture of α-atlantone (Z) and α-atlantone (E), which were isolated from the essential oil of the Atlas cedar (cedrus atlantica). The mol-ecule consists of fused six- and seven-membered rings. The seven-membered ring is in a screw-boat conformation.