Results 31 to 40 of about 5,256,026 (319)

On null Lagrangians

open access: yesDifferential Geometry and its Applications, 2005
This paper organizes some important results in the theory of homogeneous Lagrangians. One can construct a canonical Lagrangian form which is closed exactly when the Lagrangian is null. In the case of first-order homogeneity the variation integrals are parameter-independent, and the use of special (affine) coordinates leads to the result that the ...
Michael Crampin, David Saunders
openaire   +2 more sources

Role of Fishing Cooperatives in Promoting Entrepreneurship Spirit between Their Members [PDF]

open access: yesتعاون و کشاورزی, 2018
The main purpose of this research was to determine the impacts of fishing cooperatives on promoting entrepreneurship spirit among their members. The population included 1820 members of the three fishing cooperatives in Bushehr province.
Masoud Samian   +2 more
doaj   +1 more source

Modeling of Accounting and Non Accounting Items Affecting Shareholders, Wealth: Prediction and Validation [PDF]

open access: yesپژوهش‌های تجربی حسابداری, 2018
The Stock market is one of the markets from which investors try to earn interests. Stock returns are the most important measures for decision making of investors in this market.
azam valizadeh Larijani   +1 more
doaj   +1 more source

Nonapplicable nulls

open access: yesTheoretical Computer Science, 1986
A nonapplicable null appears in a relation whenever the value of the corresponding attribute does not exist. In order to evaluate a query on a relation r involving such null values, the information contained in r is represented by a set of null-free instances, then the query on r - expressed in a user-friendly query language (Generalized Relational ...
Lerat, Nadine, Lipski, Witold
openaire   +1 more source

Exploring the Relationship Between Post-Modernism and the Political [PDF]

open access: yesFaṣlnāmah-i Pizhūhish/hā-yi Rāhburdī-i Siyāsat, 2019
Postmodernism, as the current which has emerged out of developments in the modern world, and by enjoying the critical discourse of modernity, has created many effects on various spheres, including in the political arena. In this research, by raising this
مسعود اخوان کاظمی   +1 more
doaj   +1 more source

Null Deformed Domain Wall [PDF]

open access: yes, 2006
We study null 1/4 BPS deformations of flat domain wall solutions (NDDW) in N=2, d=5 gauged supergravity with hypermultiplets and vector multiplets coupled.
A. Achucarro   +39 more
core   +6 more sources

تأثیر امواج فراصوت بر جوانه‌زنی، فعالیت آنزیم‌های آلفا‌آمیلاز و آنتی‌اکسیدان، قند‌ها و کلروفیل در سرخارگل [PDF]

open access: yesPizhūhish/hā-yi tulīd-i giyāhī, 2019
سابقه و هدف: جوانه‌زنی سریع، یکنواخت و کامل بذر‌ها باعث سبز شدن مطلوب و رشد اولیه‌ی سریع گیاه می‌شود. رشد اولیه‌ی مطلوب سبب دریافت بیشتر تشعشع خورشیدی و افزایش عملکرد می‌گردد. جوانه‌زنی بذور سرخارگل کم و نامنظم می‌باشد.
سیده فاطمه رسولی   +3 more
doaj   +1 more source

Are Null Results Becoming an Endangered Species in Marketing? [PDF]

open access: yes, 1992
Editorial procedures in the social and biomedical sciences are said to promote studies that falsely reject the null hypothesis. This problem may also exist in major marketing journals.
Armstrong, J. Scott, Hubbard, Raymond
core   +3 more sources

The null divergence factor [PDF]

open access: yesPublicacions Matemàtiques, 1997
Let (P,Q) be a C1 vectorfield defined in a open subset U ⊂ R2. We call a null divergence factor a C1 solution V (x, y) of the equation P ∂V ∂x + Q∂V ∂y = ∂P ∂x + ∂Q ∂y V . In previous works it has been shown that this function plays a fundamental role in the problem of the center and in the determination of the limit cycles.
Chavarriga, J., Giacomini, H., Giné, J.
openaire   +6 more sources

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