Results 61 to 70 of about 20,000 (159)

Towards Quantum Cosmology without Singularities [PDF]

open access: yes, 1994
In this paper we investigate the vanishing of cosmological singularities by quantization. Starting from a 5d Kaluza--Klein approach we quantize, as a first step, the non--spherical metric part and the dilaton field.
A. Bilal   +14 more
core   +3 more sources

Supply Chain Configuration Adaptations of Highly‐Polluting Firms in Response to Shocks From Environmental Pressures: Case for Centralization or Diversification?

open access: yesBusiness Strategy and the Environment, Volume 35, Issue 1, Page 1403-1425, January 2026.
ABSTRACT This study examines how environmental regulatory shocks affect the supply chain configuration of highly polluting firms, a relatively understudied area in the sustainable operations literature. Using a panel dataset of Chinese A‐share listed firms from 2009 to 2022, we employ a Difference‐in‐Differences (DID) design to examine the causal ...
Gishan Dissanaike   +3 more
wiley   +1 more source

Choice Modeling: A New Approach to Valuation of Environmental Commodity; Case Study: Ganjnameh, Hamadan [PDF]

open access: yesپژوهشهای اقتصادی, 2013
Choice experiment as a subset of choice modeling approach is the newest method for calculating the value of non-market goods and estimating individuals’ preferences in dealing with environmental goods.
Gholamali sharzehi   +1 more
doaj  

Identification of New Urban Centers by Using Taxonomic Methods

open access: yesFolia Oeconomica Stetinensia, 2019
Research background: In recent years, the return of city and suburbs dwellers to city centers has been observed. This phenomenon is caused in particular by the growing costs of transport and time spent on commuting.
Makowska Anita
doaj   +1 more source

SHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealand [PDF]

open access: yes, 2006
Permian–Jurassic ultramafic to felsic intrusive complexes at Bluff Peninsula and in the southern Longwood Range along the Southland coast represent a series of intraoceanic magmatic arcs with ages spanning a time interval of 110 m.y.
Aronson JL   +15 more
core   +2 more sources

A Note on the Collision of Reissner-Nordstr\"om Gravitational Shock Waves in AdS

open access: yes, 2012
We study the collision of two Reissner-Nordstr\"om gravitational shock waves in AdS and show that the charge completely prevents the formation of marginally trapped surfaces of the Penrose type with topology S^(D-2), independently of the energy and the ...
Aharony   +30 more
core   +1 more source

Strange Magnetic Moment of The Nucleon from Lattice QCD [PDF]

open access: yes, 2000
We calculate the strange magnetic moment of the nucleon on a quenched $16^3 \times 24$ lattice at $\beta = 6.0$, and with Wilson fermions at $\kappa$ = 0.148, 0.152, and 0.154.
Beck   +13 more
core   +4 more sources

The Impact of Artificial Intelligence on Energy Conservation and Emission Reduction: Evidence From China's Listed Firms

open access: yesInternational Studies of Economics, Volume 20, Issue 4, Page 410-430, December 2025.
ABSTRACT Artificial intelligence (AI) plays an increasingly pivotal role in advancing sustainable economic development. While existing literature predominantly examines the environmental impact of AI technologies from national or sectoral perspectives, this study provides a micro‐level analysis of its effects on energy conservation and emission ...
Qiannan Zhu, Zhengyu Zhang
wiley   +1 more source

Versión real y versión monetaria de una economía de mercado artesanal

open access: yesLecturas de Economía, 2008
La economía artesanal representa específicamente la división social del trabajo porque trata de una economía de intercambio entre productores independientes; ella integra la producción (a diferencia de la economía de intercambio puro) pero descarta la ...
Fabrice Tricou
doaj   +1 more source

Exact Four-Dimensional Dyonic Black Holes and Bertotti-Robinson Spacetimes in String Theory

open access: yes, 1994
Conformal field theories corresponding to two-dimensional electrically charged black holes and to two-dimensional anti-de Sitter space with a covariantly constant electric field are simply constructed as $SL(2,R)/Z$ WZW coset models.
A. Achucarro   +23 more
core   +2 more sources

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