Results 71 to 80 of about 708,238 (289)

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

A Generalization of the Hopf-Cole Transformation

Symmetry, Integrability and Geometry: Methods and Applications, 2013
A generalization of the Hopf-Cole transformation and its relation to the Burgers equation of integer order and the diffusion equation with quadratic nonlinearity are discussed. The explicit form of a particular analytical solution is presented.
Paulius Miškinis
doaj   +1 more source

Workflow for Design of Experiments‐Based Modeling of Species Transport and Growth Kinetics in GaN Hydride Vapor Phase Epitaxy

Advanced Engineering Materials, EarlyView.
A novel workflow for investigating hydride vapor phase epitaxy for GaN bulk crystal growth is proposed. It combines Design of experiments (DoE) with physical simulations of mass transport and crystal growth kinetics, serving as an intermediate step between DoE and experiments.
J. Tomkovič, G. Lukin, H. Torkashvand, A. Kerschbaum, M. Müller, S. Besendörfer, J. Heitmann, J. Friedrich   +7 more
wiley   +1 more source

Some Criteria for Class Numbers to Be Non-One

Journal of Mathematics, 2020
Let d be a positive integer which is not a perfect square and n be any nonzero fixed integer. Then, the equation x2−dy2=n is known as the general Pell equation. In this paper, we give some criteria for class numbers of certain real quadratic fields to be
Ahmad Issa, Hasan Sankari
doaj   +1 more source

Exact quantum states of a general time-dependent quadratic system from classical action

, 1998
A generalization of driven harmonic oscillator with time-dependent mass and frequency, by adding total time-derivative terms to the Lagrangian, is considered.
A. Mostafazadeh, B.L. Schumaker, C.M.A. Dantas, D. Kohen, D.C. Khandekar, Dae-Yup Song, G.S. Agarwal, H-C. Kim, H. Dekker, H.P. Yuen, H.R. Lewis, H.R. Lewis, H.R. Lewis, Jr., H.R. Lewis, Jr., H.R. Lewis, Jr., I.A. Pedrosa, I.A. Pedrosa, J.-Y. Ji, K.H. Yeon, K.H. Yeon, L.D. Landau, L.S. Brown, M.-H. Lee, R. Jackiw, R.P. Feynman, S.A. Fulling   +25 more
core   +1 more source

Predicting Atomic Charges in MOFs by Topological Charge Equilibration

Advanced Functional Materials, EarlyView.
An atomic charge prediction method is presented that is able to accurately reproduce ab‐initio‐derived reference charges for a large number of metal–organic frameworks. Based on a topological charge equilibration scheme, static charges that fulfill overall neutrality are quickly generated.
Babak Farhadi Jahromi, Sumukh Shankar Sharadaprasad, Rochus Schmid   +2 more
wiley   +1 more source

Higher-Derivative Quantum Cosmology

, 1998
The quantum cosmology of a higher-derivative derivative gravity theory arising from the heterotic string effective action is reviewed. A new type of Wheeler-DeWitt equation is obtained when the dilaton is coupled to the quadratic curvature terms ...
A. Berkin, A. D. Linde, A. Dobado, A. L. Maroto, A. Lukas, A. Vilenkin, D. Clancy, E. T. Whittaker, F. D. Mazzitelli, F. Müller-Hoissen, F. Müller-Hoissen, G. A. Mena Marugan, H. J. de Vega, H. Suelmann, H. van Elst, I. Antoniadis, J. Demaret, J. E. Lidsey, K. Kleidis, M. B. Mijic, M. D. Pollock, M. D. Pollock, M. D. Pollock, M. de Roo, M. Gasperini, N. A. Lemos, P. Kanti, R. Brustein, R. Brustein, S. W. Hawking, S. W. Hawking, Simon Davis   +31 more
core   +2 more sources

Imaging of Biphoton States: Fundamentals and Applications

Advanced Functional Materials, EarlyView.
Quantum states of two photons exhibit a rich polarization and spatial structure, which provides a fundamental resource of strongly correlated and entangled states. This review analyzes the physics of these intriguing properties and explores the various techniques and technologies available to measure them, including the state of the art of their ...
Alessio D'Errico, Ebrahim Karimi
wiley   +1 more source

Analysis of students' errors in solving quadratic equation word problems based on Watson's criteria

Journal Focus Action of Research Mathematic
This research is motivated by the phenomenon of low student ability in solving word problems in mathematics, indicating significant challenges in understanding and applying mathematical concepts in real-life contexts. The aim of this study is to describe
Azin Taufik, Anggar Titis Prayitno, Tika Nuanatul Mufida   +2 more
doaj   +1 more source

On the Stability of Quadratic Functional Equations in F-Spaces

Journal of Function Spaces, 2016
The Hyers-Ulam-Rassias stability of quadratic functional equation f(2x+y)+f(2x-y)=f(x+y)+f(x-y)+6f(x) and orthogonal stability of the Pexiderized quadratic functional equation f(x+y)+f(x-y)=2g(x)+2h(y) in F-spaces are proved.
Xiuzhong Yang
doaj   +1 more source