Enumerating 4 x 5 and 5 x 6 double Youden rectangles
نویسندگان
چکیده
منابع مشابه
X-ray Charge-Dens Study of 5-Chloro-8-hydroxy-6-methyloaphthalene-l.4-dione: A Hydroxynaphthoquinone Derivative
The X-ray charge density analysis of a hydroxynaphthoquinnne derivative was obtained by multipolar Hansen-Coppens formalism refinement through high resolution X-ray diffraction data at 100(1) K. The molecularproperties of the title compound resulted from the combined experimental and the quantum theory of atoms inmolecules (QTAIM) studies. The topological properties of the covalent bonds and of...
متن کاملsynthesis and antihypertensive activity of novel 4-[1-(4-x-benzyl)-5-imidazolyl] dihydropyridines in rat
a series of 1,4-dihydropyridine calcium channel blockers bearing 1-(4-x -benzyl)-5-imidazolyl substituent at 4 position (5a-e) (x=h, f) were synthesized and tested for antihypertensive activity in desoxycorticosterone acetate (doca)-induced hypertension in rats. amlodipine was used as the standard dihydropyridine. all compounds tested showed lower antihypertensive activity than that of amlodipi...
متن کاملON THE DIOPHANTINE EQUATION x 4 − q 4 = py 5
In this paper we study the Diophantine equation x4− q4 = py5, with the following conditions: p and q are different prime natural numbers, y is not divisible with p, p ≡ 3 (mod20), q ≡ 4 (mod5), p is a generator of the group (
متن کاملx-ray charge-dens study of 5-chloro-8-hydroxy-6-methyloaphthalene-l.4-dione: a hydroxynaphthoquinone derivative
the x-ray charge density analysis of a hydroxynaphthoquinnne derivative was obtained by multipolar hansen-coppens formalism refinement through high resolution x-ray diffraction data at 100(1) k. the molecularproperties of the title compound resulted from the combined experimental and the quantum theory of atoms inmolecules (qtaim) studies. the topological properties of the covalent bonds and of...
متن کاملSynthesis of 5- and 6-Carboxy-X-rhodamines
An efficient route is reported to 5- and 6-carboxy-X-rhodamines (compounds 1 and 2) that contain multiple n-propylene or gamma,gamma-dimethylpropylene groups bridging terminal nitrogen atoms and the central xanthene core. Gram quantities of these dyes are synthesized from inexpensive starting materials. The isolated products are activated by selective transformation of the carboxylic acid group...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 1994
ISSN: 0012-365X
DOI: 10.1016/0012-365x(94)90153-8