Results 31 to 40 of about 152,870 (324)

Stirling engine: Construction and performance analysis at low temperatures [PDF]

E3S Web of Conferences
Stirling engines, categorized as hot air engines, offer remarkable versatility by operating on a variety of fuel sources, which is a significant advantage in the context of energy diversification and sustainability.
Muradov Muzaffar, Tuychiyeva Makhliyo, Muradov Rivajiddin, Axmedov Avazbek   +3 more
doaj   +1 more source

Harmonic number identities via polynomials with r-Lah coefficients

Comptes Rendus. Mathématique, 2020
In this paper, polynomials whose coefficients involve $r$-Lah numbers are used to evaluate several summation formulae involving binomial coefficients, Stirling numbers, harmonic or hyperharmonic numbers.
Kargın, Levent, Can, Mümün
doaj   +1 more source

Solar powered stirling engine for domestic household and rural areas in Karachi, Pakistan

Memoria Investigaciones en Ingeniería, 2023
There is a critical need to use the abundantly available solar energy worldwide due to the global energy crisis. The goal of this study is to demonstrate the residential use of a stirling engine powered by solar energy in Karachi, Pakistan.
Muhammad Uzair, Irtiza Yawar, Syed Ali Jawad, Batool Fatima, Muhammad Furqan   +4 more
doaj   +1 more source

Congruences for the Stirling numbers and associated Stirling numbers [PDF]

Acta Arithmetica, 1990
Let s(n,k) and S(n,k) be the Stirling numbers of the first and second kind, respectively. The author proves that if \(k+n\) is odd, then \[ s(n,k)\equiv 0 (mod\left( \begin{matrix} n\\ 2\end{matrix} \right)),\quad S(n,k)\equiv 0 (mod\left( \begin{matrix} k+1\\ 2\end{matrix} \right)).
openaire   +2 more sources

Generalized Bell Numbers and Peirce Matrix via Pascal Matrix

International Journal of Mathematics and Mathematical Sciences, 2018
With the Stirling matrix S and the Pascal matrix T, we show that TkS (k≥0) satisfies a type of generalized Stirling recurrence. Then, by expressing the sum of components of each row of TkS as k-Bell number, we investigate properties of k-Bell numbers as ...
Eunmi Choi
doaj   +1 more source

The Structure of n-Point One-Loop Open Superstring Amplitudes [PDF]

, 2014
In this article we present the worldsheet integrand for one-loop amplitudes in maximally supersymmetric superstring theory involving any number n of massless open string states.
A Bilal, A Tsuchiya, AB Goncharov, BEW Nilsson, Carlos R. Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, CR Mafra, D Lüst, E D’Hoker, E D’Hoker, E D’Hoker, E Witten, EP Verlinde, FA Berends, G Policastro, H Gomez, H Gomez, I Oda, J Bjornsson, J Bjornsson, JJ Atick, JJ Carrasco, JM Drummond, JM Drummond, JP Harnad, L Brink, LA Barreiro, LJ Dixon, M Tentyukov, MAA Leeuwen van, MB Green, MB Green, MB Green, MB Green, MB Green, MB Green, N Arkani-Hamed, N Arkani-Hamed, N Arkani-Hamed, N Berkovits, N Berkovits, N Berkovits, N Berkovits, N Berkovits, N Berkovits, N Berkovits, N Berkovits, N Berkovits, NEJ Bjerrum-Bohr, NEJ Bjerrum-Bohr, Oliver Schlotterer, PA Grassi, R Kleiss, RH Boels, RM Schabinger, S Caron-Huot, S Stieberger, S Stieberger, S Stieberger, SJ Parke, T Ritbergen van, V Duca Del, Y Aisaka, Z Bern, Z Bern, Z Bern, Z Bern, Z Bern, Z Bern, Z Bern, Z Bern, Z Bern   +78 more
core   +2 more sources

Combinatorially interpreting generalized Stirling numbers [PDF]

, 2014
Let $w$ be a word in alphabet $\{x,D\}$ with $m$ $x$'s and $n$ $D$'s. Interpreting "$x$" as multiplication by $x$, and "$D$" as differentiation with respect to $x$, the identity $wf(x) = x^{m-n}\sum_k S_w(k) x^k D^k f(x)$, valid for any smooth function ...
Engbers, John, Galvin, David, Hilyard, Justin   +2 more
core   +4 more sources

Computational Optimization of Free-Piston Stirling Engine by Variable-Step Simplified Conjugate Gradient Method with Compatible Strategies

Energies, 2022
This study aimed at the development of an algorithm for the computational optimization of free-piston Stirling engines. The design algorithm includes an optimization method and two compatible strategies.
Chin-Hsiang Cheng, Yu-Ting Lin
doaj   +1 more source

Generalized Fock spaces and the Stirling numbers [PDF]

, 2018
The Bargmann-Fock-Segal space plays an important role in mathematical physics, and has been extended into a number of directions. In the present paper we imbed this space into a Gelfand triple. The spaces forming the Fr\'echet part (i.e.
Alpay D., Alpay D., Biagini F., Blasiak P., Bourbaki N., Daniel Alpay, Erdélyi A., Gelfand I. M., Gelfand I. M., Hall B. C., Karp D., Karp D., Motke Porat, Schneider W. R., Våge G.   +14 more
core   +3 more sources

Normal Ordering for Deformed Boson Operators and Operator-valued Deformed Stirling Numbers

, 1992
The normal ordering formulae for powers of the boson number operator $\hat{n}$ are extended to deformed bosons. It is found that for the `M-type' deformed bosons, which satisfy $a a^{\dagger} - q a^{\dagger} a = 1$, the extension involves a set of ...
Abramowitz M, Biedenharn L C, Carlitz L, Carlitz L, Chakrabarti R, Exton H, Garsia A M, Gould H W, J Katriel, Katriel J, Katriel J, Louisell W H, M Kibler, Macfarlane A J, Milne S C, Riordan J, Wachs M, Wilcox R M   +17 more
core   +3 more sources