نتایج جستجو برای: structural counts phenylene

تعداد نتایج: 449460  

1989
Kenneth D. Forbus Dedre Gentner

Judgments of similarity and soundness are important aspects of human analogical processing. This paper explores how these judgments can be modeled using SME, a simulation of Gentner's structure-mapping theory. We focus on structural evaluation, explicating several principles which psychologically plausible algorithms should follow. We introduce the Speci city Conjecture, which claims that natur...

Journal: :JASIST 2012
Chaomei Chen

A critical part of a scientific activity is to discern how a new idea is related to what we know and what may become possible. As the number of new scientific publications arrives at a rate that rapidly outpaces our capacity of reading, analyzing, and synthesizing scientific knowledge,we need to augment ourselveswith information that can effectively guide us through the rapidly growing intellec...

2016
Christopher Schweez Philip Shushkov Stefan Grimme Sigurd Höger

Phenylacetylene-based [2]rotaxanes were synthesized by a covalent-template approach by aminolysis of the corresponding prerotaxanes. The wheel and the bulky stoppers are made of phenylene-ethynylene-butadiynylene macrocycles of the same size. The stoppers are large enough to enable the synthesis and purification of the rotaxane. However, the wheel unthreads from the axle at elevated temperature...

Journal: :Chemistry 2002
Akihiro Orita De Lie An Takehiko Nakano Jayamma Yaruva Nianchun Ma Junzo Otera

A new strategy for constructing enantiopure acetylenic cyclophanes is described on the basis of one-pot double elimination reaction starting from dialdehydes and bis(sulfoximine)s. In this case, the conventional sulfone protocol affords poorer yields of the desired cyclophanes. Thus, arylene-ethynylene moieties with terminal sulfoximine or formyl functions are linked to binaphthyl cores and the...

ژورنال: :مجله گیاهشناسی ایران 2014
مریم کشاورزی سمیه اسفندانی بزچلویی

شمارش کروموزومی 23 جمعیت متعلق به 3 جنس و 8 آرایه از تیره میخک ( زیر تیره alsinoideae) از ایران گزارش می شود. اولین گزارش کروموزومی برای گونه های s. persica (2n=28)، s. alsinoides (2n=2x=30) و mesostemma kotschyanum subsp. kotschyanum ( 2n=32) ارائه می شود. گونه های جنس stellaria به دو گروه تتراپلوئید و دیپلوئید تقسیم بندی می شوند. شمارش کروموزومی برای شش تاکسون از stellaria (caryophyllaceae) و...

Journal: :journal of genetic resources 0
maryam keshavarzi plant sciences department, faculty of biological sciences, alzahara university, vanak, tehran, iran ehteram najafian plant sciences department, faculty of biological sciences, alzahara university, vanak, tehran, iran zahra nazem bokaee plant sciences department, faculty of biological sciences, alzahara university, vanak, tehran, iran

erodium (geranaiceae) species are distributed in different habitats of iran. some species are of medicinal importance while some are well known weeds. there are no chromosome counts for erdoium species of iran. chromosome numbers are given for six taxa of erodium (geraniaceae) from iran: e. cicutarium (2n=36), e. ciconium(2n=18), e. malacoides (2n=20), e. moschatum (2n=20), e. neuradifolium (2n...

2001
Bo Bernhard Nielsen BO BERNHARD NIELSEN

Although trust has been given much attention in alliance literature as an explanatory factor, little research has been devoted to defining and operationalizing trust. Trust is more or less seen as a magic ingredient, poorly understood much like the concept of luck, and usually attributed ex post; successful alliances seem to involve trust; unsuccessful alliances do not. The extant literature ha...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2011
André Leitão Botelho Yongwoo Shin Minghai Li Lili Jiang Xi Lin

Two transferable physical parameters are incorporated into the Su-Schrieffer-Heeger Hamiltonian to model conducting polymers beyond polyacetylene: the parameter γ scales the electron-phonon coupling strength in aromatic rings and the other parameter ε specifies the heterogeneous core charges. This generic Hamiltonian predicts the fundamental band gaps of polythiophene, polypyrrole, polyfuran, p...

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