Results 61 to 70 of about 1,297,290 (281)

Association of CDKN2A/B Homozygous Deletion and Extent of Resection With Survival of Patients With WHO CNS5 Grade 4 Astrocytoma

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives WHO grade 4 astrocytomas are associated with poor prognosis, and their prognostic factors remain controversial. This study aimed to identify the prognostic factors and develop a management algorithm for these patients. Methods This study retrospectively included 151 CNS5 adult grade 4 astrocytomas from two medical centers.
Jiawei Cai, Guanglin Zhu, Qiu He, Chen Luo, Lingyun Zhuo, Xingfu Wang, Yiming Chen, Xiaoyong Chen, Wendong You, Jiaheng Xu, Yuanxiang Lin, Dezhi Kang, Shuai Wu, Zanyi Wu   +13 more
wiley   +1 more source

Product Integral Representations of Wilson Lines and Wilson Loops, and Non-Abelian Stokes Theorem [PDF]

, 1999
We make use of product integrals to provide an unambiguous mathematical representation of Wilson line and Wilson loop operators. Then, drawing upon various properties of product integrals, we discuss such properties of these operators as approximating ...
Karp, R. L., Mansouri, F., Rno, J. S.
core   +2 more sources

The Poincare mass operator in terms of a hyperbolic algebra

, 2005
The Poincare mass operator can be represented in terms of a Cl(3,0) Clifford algebra. With this representation the quadratic Dirac equation and the Maxwell equations can be derived from the same mathematical structure.Comment: 5 pages ...
Baylis, Baylis, Fjelstad, Fjelstad, Fjelstad, Hestenes, Hestenes, Hucks, Keller, Motter, Reany, Reany, S. Ulrych, Wuming, Xuegang, Xuegang, Xuegang   +16 more
core   +1 more source

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

Current Tracking Adaptive Control of Brushless DC Motors

International Journal of Adaptive Control and Signal Processing, EarlyView.
In this paper, the current tracking for Brushless Direct Current motors is approached considering uncertainty in the parameters of the motor's model. An adaptive control scheme to compensate electrical parameters uncertainty is proposed without requiring any knowledge of the mechanical parameters.
Fernanda Ramos‐García, Axel Coronado‐Andrade, Gerardo Espinosa‐Pérez, Luis Alvarez‐Icaza   +3 more
wiley   +1 more source

MATHEMATICAL REPRESENTATION OF GRADE 7 STUDENTS IN SET THEORY TOPICS THROUGH PROBLEM-BASED LEARNING

Infinity, 2020
Set theory has a wide role in mathematical concepts. Students have to understand the set theory before learning other concepts such as algebra and probability.
Ida Lestari, Nila Kesumawati, Yunika Lestaria Ningsih   +2 more
doaj   +1 more source

Torus knots and Dunwoody manifolds

, 2003
We obtain an explicit representation, as Dunwoody manifolds, of all cyclic branched coverings of torus knots of type $(p,mp\pm 1)$, with $p>1$ and $m>0$.Comment: 11 pages, 7 figures, to appear in the Siberian Mathematical ...
Aydin, Huseyin, Gultekyn, Inci, Mulazzani, Michele   +2 more
core   +2 more sources

An Adaptive Human Pilot Model With Reaction Time Delay for Enhanced Adaptive Control in Piloted Systems

International Journal of Adaptive Control and Signal Processing, EarlyView.
This work introduces an adaptive human pilot model that captures pilot time‐delay effects in adaptive control systems. The model enables the prediction of pilot–controller interactions, facilitating safer integration and improved design of adaptive controllers for piloted applications.
Abdullah Habboush, Yildiray Yildiz
wiley   +1 more source

PENGEMBANGAN LEMBAR KEGIATAN KALKULUS BERCIRIKAN REPRESENTASI MATEMATIS

Aksioma: Jurnal Program Studi Pendidikan Matematika, 2019
Penelitian ini bertujuan untuk menghasilkan Lembar Kegiatan Kalkulus bercirikan representasi matematis yang valid, praktis dan efektif. Prosedur penelitian terdiri dari penelitian pendahuluan, pembuatan prototipe, dan penilaian. Hasil validasi, observasi,
Octavina Rizky Utami Putri, Zukhrufurrohmah Zukhrufurrohmah   +1 more
doaj   +1 more source

Physical entities and mathematical representation

Journal of Research of the National Bureau of Standards Section B Mathematics and Mathematical Physics, 1961
Certain basic postulates about physical observables yield the structure of their mathematical representation. Measure equations are contrasted with quantity equations, and measurement units with abstract units. The abstract vector spaces in which observables are represented comprise the core of dimensional analysis.
openaire   +2 more sources