Results 51 to 60 of about 213,067 (334)

GIS spatial analysis of the distribution of snow depth: A study of western Rhodopes, Bulgaria [PDF]

open access: yesGlasnik Srpskog Geografskog Društva, 2016
The aim of the present research is to show the advantages of information technology in investigating the snow cover. The snow data is usually taken from the measurement in meteorological stations which are often sparsely and insufficient.
Nikolova Valentina, Penkov Aleksandar
doaj   +1 more source

Galois coverings of representation-infinite algebras

open access: yesCommentarii Mathematici Helvetici, 1987
If R is a locally bounded K-category, K some algebraically closed field, G a group of K-linear automorphisms of R acting freely on the objects of R, then it was proved by \textit{P. Gabriel} [in: Representations of algebras, Lect. Notes Math. 903, 68-105 (1981; Zbl 0481.16008), \textit{K. Bongartz}, \textit{P. Gabriel}, Invent. Math. 65, 331-378 (1982;
Skowronski, Andrzej, Dowbor, Piotr
openaire   +2 more sources

Quantum Mechanics On Spaces With Finite Fundamental Group [PDF]

open access: yes, 1995
We consider in general terms dynamical systems with finite-dimensional, non-simply connected configuration-spaces. The fundamental group is assumed to be finite.
Giulini, Domenico
core   +1 more source

Physical Origin of Temperature Induced Activation Energy Switching in Electrically Conductive Cement

open access: yesAdvanced Science, EarlyView.
The temperature‐induced Arrhenius activation energy switching phenomenon of electrical conduction in electrically conductive cement originates from structural degradation within the biphasic ionic‐electronic conduction architecture and shows percolation‐governed characteristics: pore network opening dominates the low‐percolation regime with downward ...
Jiacheng Zhang   +7 more
wiley   +1 more source

Split Involution Coupled to Actual Gauge Symmetry

open access: yes, 1994
The split involution quantization scheme, proposed previously for pure second--class constraints only, is extended to cover the case of the presence of irreducible first--class constraints.
Batalin, I. A.   +2 more
core   +2 more sources

Why Computational Photochemistry Is Challenging and Will Probably Remain So: A Quantum Chemist's Perspective

open access: yesAdvanced Science, EarlyView.
Computational Photochemistry has made great strides in recent decades, but the investigation of larger molecules remains a challenge due to the inherent dilemma between the increasing computational accuracy required as the molecule size increases and the inevitable explosion in computational effort.
Andreas Dreuw
wiley   +1 more source

R Libraries for Remote Sensing Data Classification by K-Means Clustering and NDVI Computation in Congo River Basin, DRC

open access: yesApplied Sciences, 2022
In this paper, an image analysis framework is formulated for Landsat-8 Operational Land Imager and Thermal Infrared Sensor (OLI/TIRS) scenes using the R programming language.
Polina Lemenkova, Olivier Debeir
doaj   +1 more source

On the Hilbert series of vertex cover algebras of Cohen-Macaulay bipartite graphs [PDF]

open access: yes, 2009
We study the Hilbert function and the Hilbert series of the vertex cover algebra $A(G)$, where $G$ is a Cohen-Macaulay bipartite graph.Comment: 12 ...
Ion, Cristian
core   +3 more sources

Low‐Power Control Of Resistance Switching Transitions in First‐Order Memristors

open access: yesAdvanced Electronic Materials, EarlyView.
Joule losses are a serious concern in modern integrated circuit design. In this regard, minimizing the energy necessary for programming memristors should be handled with care. This manuscript presents an optimal control framework, allowing to derive energy‐efficient programming voltage protocols for resistance switching devices. Following this approach,
Valeriy A. Slipko   +3 more
wiley   +1 more source

On the Hilbert series of vertex cover algebras of Cohen-Macaulay bipartite graphs

open access: yesLe Matematiche, 2010
We study the Hilbert function and the Hilbert series of the vertex cover algebra A(G), where G is a Cohen-Macaulay bipartite graph.
Cristian Ion
doaj  

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