Results 101 to 110 of about 502,153 (332)

A comparative study of frictional force in self-ligating brackets according to the bracket-archwire angulation, bracket material, and wire type

The Korean Journal of Orthodontics, 2015
Objective This study aimed to compare the frictional force (FR) in self-ligating brackets among different bracket-archwire angles, bracket materials, and archwire types.
Souk Min Lee, C. Hwang
semanticscholar   +1 more source

Solution‐Processable and Ambient‐Stable Highly Conductive p‐Type Polymers Derived from Dihydropyrazine and Ethylenedioxythiophene

Advanced Functional Materials, EarlyView.
This work presents π–conjugated polymers based on dihydropyrazine (DHP) and ethylenedioxythiophene (EDOT), developed to produce highly conductive, flexible films for printed electronics. By optimizing the DHP and EDOT ratio, strong and compact π–π stacking is achieved, resulting in polymer films with conductivities up to 1700 S cm−1 under ambient ...
Sung Jae Jeon, Naixin Zhao, Yi Yuan, Yuning Li   +3 more
wiley   +1 more source

A study on the dimensional design of brackets of multi-tiered wooden pagodas in East Asia

Journal of Asian Architecture and Building Engineering
Methods for dimensional design of brackets of multi-tiered wooden pagodas in East Asia are discussed. The research method for quantifying the brackets design of each wooden five-tiered pagoda by setting a V-value with an initial value equal to 1, and ...
Jiangling Ma, Tomo Inoue, Yida Sun
doaj   +1 more source

Realizations of observables in Hamiltonian systems with first class constraints

, 2004
In a Hamiltonian system with first class constraints observables can be defined as elements of a quotient Poisson bracket algebra. In the gauge fixing method observables form a quotient Dirac bracket algebra.
A. V. BRATCHIKOV, Dirac P. A. M., Sniatycki I. J.   +2 more
core   +1 more source

In vitro evaluation of frictional forces of two ceramic orthodontic brackets versus a stainless steel bracket in combination with two types of archwires

Journal of Orthodontic Science, 2015
Purpose: The aim of this study was to compare frictional forces between monocrystalline alumina (MA), polycrystalline alumina (PA), and stainless steel (SS) brackets with two SS wires: Rectangular and round. Materials and Methods: In this in vitro study,
Valiollah Arash, M. Rabiee, V. Rakhshan, S. Khorasani, Farhad Sobouti   +4 more
semanticscholar   +1 more source

Monoidal Categories and the Gerstenhaber Bracket in Hochschild Cohomology [PDF]

, 2014
Let A be an associative and unital algebra over a commutative ring K, such that A is K-projective. The Hochschild cohomology ring HH*(A) of A is, as a graded algebra, isomorphic to the Ext-algebra of A in the category of A-bimodules.
Reiner Hermann
semanticscholar   +1 more source

“Writing” Crystal Phases in Amorphous Calcium Carbonate via Laser‐Induced Patterned Transformations

Advanced Functional Materials, EarlyView.
Laser‐induced crystallization enabling the patterning of amorphous calcium carbonate into various distinct phases is introduced. This approach provides spatial control over polymorph selection, both crystalline and amorphous, inspired by biomineralization pathways.
Hadar Shaked, Iryna Polishchuk, Niv Ben‐Arie, Daniela Dobrynin, Javier Gainza, Alexander Katsman, Boaz Pokroy   +6 more
wiley   +1 more source

Orthodontic Metallic Lingual Brackets: The Dark Side of the Moon of Bond Failures?

Journal of Functional Biomaterials, 2017
Lingual orthodontics, among both young and adult patients, increased in popularity during last years. The purposes of the present investigation were to evaluate the shear bond strength (SBS) values and Adhesive Remnant Index (ARI) scores of different ...
Maria Francesca Sfondrini, Paola Gandini, Andrea Gioiella, Feng Xiao Zhou, Andrea Scribante   +4 more
doaj   +1 more source

Courant brackets on noncommutative algebras and omni-Lie algebras [PDF]

arXiv, 2006
We define a Courant bracket on an associative algebra using the theory of Hochschild homology, and we introduce the notion of Dirac algebra. We show that the bracket of an omni-Lie algebra is quite a kind of Courant bracket.
arxiv  

Shear coordinate description of the quantised versal unfolding of D_4 singularity

, 2010
In this paper by using Teichmuller theory of a sphere with four holes/orbifold points, we obtain a system of flat coordinates on the general affine cubic surface having a D_4 singularity at the origin.
Bolibruch A A, Chekhov L O, Chekhov L O, Chekhov L O, Chekhov L O, Dubrovin B, Etingof P Ginzburg V, Fock V V, Fock V V, Garnier R, Hitchin N, Leonid Chekhov, Marta Mazzocco, Mazzocco M Vidunas R, Schlesinger L   +14 more
core   +1 more source