Results 1 to 10 of about 813 (156)

Quasi-Jacobi forms, elliptic genera and strings in four dimensions

Journal of High Energy Physics, 2021
We investigate the interplay between the enumerative geometry of Calabi-Yau fourfolds with fluxes and the modularity of elliptic genera in four-dimensional string theories.
Seung-Joo Lee, Wolfgang Lerche, Guglielmo Lockhart, Timo Weigand   +3 more
doaj   +1 more source

Prediction method and distribution characteristics of in situ stress based on borehole deformation—A case study of coal measure stratum in Shizhuang block, Qinshui Basin

Frontiers in Earth Science, 2022
A geometric equation of borehole deformation under stress was deduced based on the basic theory of elasticity. Subsequently, we established the quantitative relationship between the in situ stress and geometrical parameters of borehole deformation ...
Xinxin Fang, Xinxin Fang, Hong Feng, Yunhong Wang, Tao Fan   +4 more
doaj   +1 more source

Improved TM Dual-Mode Filters With Reduced Fabrication Complexity

IEEE Journal of Microwaves, 2023
This work presents an alternate and improved approach for the design of dual-mode filters that utilize transverse magnetic (TM) and nonresonating modes. The method that is proposed in this work allows for an improvement of the typical TM dual-mode filter
Chad Bartlett, Jens Bornemann, Michael Hoft   +2 more
doaj   +1 more source

New Compact Microstrip Filters Based on Quasi Fractal Resonator

Advanced Electromagnetics, 2018
This paper presents new microstrip devices  as single band bandpass and multi band bandstop filters. The proposed filters use  slotted patch microstrip resonator based on quasi fractal geometry, simulated by AWR12 software package.
Y. S. Mezaal, H. H. Saleh, H. Al-saedi
doaj   +1 more source

Kinematic Mapping in Semi-Euclidean 4-Space

Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2015
We study the some algebraic properties of matrix associated to Hamilton operators is defined for semi-quaternions. The kinematic mapping corresponding to these operators in semi-Euclidean 4-space is same as the kinematic mapping of Blaschke and Grünwald ...
Mehdi JAFARI
doaj   +4 more sources

Modular fluxes, elliptic genera, and weak gravity conjectures in four dimensions

Journal of High Energy Physics, 2019
We analyse the Weak Gravity Conjecture for chiral four-dimensional F-theory compactifications with N = 1 supersymmetry. Extending our previous work on nearly tensionless heterotic strings in six dimensions, we show that under certain assumptions a tower ...
Seung-Joo Lee, Wolfgang Lerche, Timo Weigand   +2 more
doaj   +1 more source

MQGeometry-1.0: a multi-layer quasi-geostrophic solver on non-rectangular geometries [PDF]

Geoscientific Model Development
This paper presents MQGeometry, a multi-layer quasi-geostrophic (QG) equation solver for non-rectangular geometries. We advect the potential vorticity (PV) with finite volumes to ensure global PV conservation using a staggered discretization of the PV ...
L. Thiry, L. Li, G. Roullet, E. Mémin
doaj   +1 more source

Kinematic Mapping in Semi-Euclidean 4-Space

Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2014
We study the some algebraic properties of matrix associated to Hamilton operators is defined for semi-quaternions. The kinematic mapping corresponding to these operators in semi-Euclidean 4-space is same as the kinematic mapping of Blaschke and Grünwald ...
Mehdi JAFARI
doaj  

An Enhanced Event-Based Model for Integrated Flight Safety of Fixed-Wing UAVs. [PDF]

Sensors (Basel)
Ma X, Lu X, Li H, Lu X, Li J, Zhao J.
europepmc   +1 more source

Optimization of asymmetric gyrostatic satellite kinematics in a resistive medium: A novel elliptic function solution. [PDF]

Sci Rep
Elneklawy AH, Amer TS, Elkilany SA, Seliem ASA, Hegazy N.   +4 more
europepmc   +1 more source