Search results for "Transform"
showing 10 items of 3975 documents
Design and synthesis of the first triply twisted Möbius annulene.
2014
As long as 50 years ago theoretical calculations predicted that Mobius annulenes with only one π surface and one edge would exhibit peculiar electronic properties and violate the Huckel rules. Numerous synthetic attempts notwithstanding, the first singly twisted Mobius annulene was not prepared until 2003. Here we present a general, rational strategy to synthesize triply or even more highly twisted cyclic π systems. We apply this strategy to the preparation of a triply twisted [24]dehydroannulene, the structure of which was confirmed by X-ray analysis. Our strategy is based on the topological transformation of 'twist' into 'writhe'. The advantage is twofold: the product exhibits a lower deg…
Surface homeomorphisms with zero dimensional singular set
1998
We prove that if f is an orientation-preserving homeomorphism of a closed orientable surface M whose singular set is totally disconnected, then f is topologically conjugate to a conformal transformation.
Multiscale analysis of range image: its use for growth increment characterization
1999
A new image-processing approach for object analysis in life and earth sciences is presented. This approach is based on a multireso- lution algorithm in image processing. A clamshell surface has been digi- tized using a noncontact optical sensor based on laser triangulation. The 3-D surface obtained constitutes an image that can be characterized by multiresolution analysis. The application of this method to the study of a bivalve shell surface (Unio sp., Recent Atlantic, Holocene) allowed the various growth increments and their potential relationship with environ- mental constraints to be measured. The algorithm used in this paper is based on the wavelet transform theory. © 1999 Society of P…
Surface Reflectance: An Optical Method for Multiscale Curvature Characterization of Wear on Ceramic–Metal Composites
2020
Surface gradient characterization by light reflectance (SGCLR) is used for the first time for multiscale curvature calculations and discrimination of worn surfaces on six damaged ceramic&ndash
Chronic myeloid leukemia-derived exosomes promote tumor growth through an autocrine mechanism.
2014
Background Chronic myeloid leukemia (CML) is a clonal hematopoietic stem cell disorder in which leukemic cells display a reciprocal t(9:22) chromosomal translocation that results in the formation of the chimeric BCR-ABL oncoprotein, with a constitutive tyrosine kinase activity. Consequently, BCR-ABL causes increased proliferation, inhibition of apoptosis, and altered adhesion of leukemic blasts to the bone marrow (BM) microenvironment. It has been well documented that cancer cells can generate their own signals in order to sustain their growth and survival, and recent studies have revealed the role of cancer-derived exosomes in activating signal transduction pathways involved in cancer cell…
Is circular economy the key to transitioning towards sustainable development? Challenges from the perspective of care ethics
2019
Abstract The Sustainable Development Goals represent a global consensus on the urgency to preserve the conditions that make life possible on this planet and ensure a future of wellbeing for humanity. Transforming consumption and production processes is a fundamental priority of this development agenda. Circular Economy has emerged as an alternative model, given its potential for value creation, while generating social and environmental positive impacts. An exploratory study carried out in Navarra (Spain) shows its potentiality for socio-economic and environmental benefits as well as technological, organizational, financial, institutional and social challenges. However, through the lenses of…
Industrial ecology and sustainable change: inertia and transformation in Mexican agro-industrial sugarcane clusters
2021
This article explores the capacity of industrial ecology to generate sustainable development in Latin America’s agro-industrial clusters. An evolutionary analytical approach is outlined, which is u...
Localising SDGs in Rural Uganda: Learning Active Citizenship Through the Saemaul Undong Model
2021
The Sustainable Development Goals (SDGs) are premised on the principles of ‘leaving no one behind’ and transformative development. Achieving the goals requires active citizens that are engaged in community development and claiming their rights. The chapter explores the ways in which a local NGO uses Saemaul Undong (SMU), a Korean community development model, to localise holistic achievement of a number of SDGs. Drawing on theories of the travel of global ideas in institutional sociology and based on participatory research including in-depth interviews, focus group discussions and participation in community activities, the chapter analyses how SMU’s three pillars of self-help, diligence and …