Involutions of spherical 3-manifolds [PDF]
24 pages, 1 ...
Mecchia M., Schilling B.
openaire +3 more sources
A Reciprocal Transformation for the Constant Astigmatism Equation [PDF]
, 2014 We introduce a nonlocal transformation to generate exact solutions of the constant astigmatism equation $z_{yy} + (1/z)_{xx} + 2 = 0$. The transformation is related to the special case of the famous B\"acklund transformation of the sine-Gordon equation ...
Hlaváč, Adam, Marvan, Michal
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Iterating evolutes and involutes [PDF]
, 2016 This paper concerns iterations of two classical geometric constructions, the evolutes and involutes of plane curves, and their discretizations: evolutes and involutes of plane polygons.
Arnold, Maxim +4 more
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Slant helices in three dimensional lie groups
, 2012 In this paper, we define slant helices in three dimensional Lie Groups with a bi-invariant metric and obtain a characterization of slant helices. Moreover, we give some relations between slant helices and their involutes, spherical images.Comment: 15 ...
Ekmekci, N. +3 more
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High-order involute modified noncircular bevel gears
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2014 Noncircular bevel gears (NBGs) is a kind of spatial transmission mechanism which can be used to transmit the motion and power between two intersecting axes with a variable transmission ratio and according to a suitable motion program.
Jiqiang XIA, Kan SHI, Chunjie WANG
doaj +1 more source
Foraminiferal assemblages from the bajocian global stratotype section and point (GSSP) at Cape Mondego (Portugal) [PDF]
, 2013 A detailed study of the benthic foraminiferal assemblages at the Bajocian Global Stratotype Section and Point (GSSP— Murtinheira section, Lusitanian Basin, western Portugal) presented herein increases the correlation potential of this relevant global ...
Canales Fernández, María Luisa +1 more
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THE LOGARITHMIC SPIRAL AND ITS SPHERICAL COUNTERPART
Journal of Industrial Design and Engineering Graphics, 2020 Logarithmic spirals are isogonal trajectories of pencils of lines. From a series of geometric consequences, we pick out a few which are relevant for kinematics: When a logarithmic spiral rolls on a line, its asymptotic point traces a straight line. Hence,
Hellmuth Stachel +2 more
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A Review on Solar Concentrators with Multi-surface and Multi-element (MS/ME) Combinations [PDF]
, 2019 Solar concentrator always plays an important role in solar energy collection as it could enhance the energy density effectively. Various structures of solar concentrators have been researched in recent years, among which multi-surface (MS) and multi ...
Liu, Shuli, Ma, Xinglong, Zheng, Hongfei
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Evolutionarily divergent DUF4465 domains have a common vitamin B12‐binding function
FEBS Open Bio, EarlyView.We show that DUF4465 family proteins, widespread across bacteria from gut microbiomes, hydrothermal vents, and soil, share a common vitamin B12‐binding function. These augmented β‐jellyroll proteins bind vitamin B12 via extended loops. Our findings establish sequence‐diverse DUF4465 proteins as a widespread class of B12‐binding proteins, highlighting ...
Charlea Clarke +4 more
wiley +1 more source
Taxonomic studies of mosses of Seram and Ambon (Moluccas, East Malesia) collected by Indonesian-Japanese botanical expeditions : 9., Pottiaceae [PDF]
, 1996 Mosses of Seram and Ambon Islands are reported based on our collections of the botanical expeditions to the islands. This paper is the ninth part of our report and includes the Pottiaceae (total 8 genera and 14 species).
Akiyama, Hiroyuki
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