Results 1 to 10 of about 2,700,877 (189)

Arbitrary Choice of Basic Variables in Density Functional Theory. I. Formalism [PDF]

Physical Review B, 2003
The Hohenberg-Kohn theorem of the density functional theory is extended by modifying the Levy constrained-search formulation. The new theorem allows us to choose arbitrary physical quantities as the basic variables which determine the ground-state ...
Higuchi, K., Higuchi, M.
core   +6 more sources

The choice of basic variables in current-density functional theory [PDF]

Physical Review A, 2012
The selection of basic variables in current-density functional theory and formal properties of the resulting formulations are critically examined. Focus is placed on the extent to which the Hohenberg--Kohn theorem, constrained-search approach and Lieb's ...
Ekström, Ulf, Helgaker, Trygve, Kvaal, Simen, Sagvolden, Espen, Teale, Andrew M., Tellgren, Erik I.   +5 more
core   +4 more sources

Measurement of basic density of total tree chips

Silva Fennica, 1976
The paper describes a method for the measurement of basic density of total tree chips. In the method the chips are placed in a container, which is immersed in a cylinder full of water, and the container is weighted at two levels. In the upper part of the
Kärkkäinen, Matti
doaj   +2 more sources

Study the Exposure of Low-Level Laser on rGO/Ag NPs to Improve the Antibacterial Activity of Different Types of Bacteria

Nano Biomedicine and Engineering, 2022
The rGO-Ag NPs nanocomposite was synthesized by an easy, low-cost, one-step chemical method. The nanocomposite was analyzed by UV-Vis spectroscopy and atomic force microscope (AFM) to verify the properties of the nanoparticles.
Noora Al-Janabi, Amer Al-Nafiey
doaj   +1 more source

Physical and Chemical Properties of Highland Bamboo (Yushania alpina) Culms Grown in Ethiopia

Drvna Industrija, 2023
Bamboo is the fastest growing plant currently known on earth, a property that enables it to be the best alternative as a future source of wood fi ber. This study investigated the effect of site and culm height on the physical and chemical properties of ...
Mahadi Mussa, Getachew Desalegn, Gemechu Kaba, Anteneh Tesfaye   +3 more
doaj   +1 more source

Anatomical and variation of physical properties in the axial direction of three bamboo species in the eastern Amazon of Peru

Scientia Agropecuaria, 2023
Bamboos are abundant and versatile, hence their growing interest throughout the world in a variety of uses, however, there is little technical information on the anatomy and physical properties that are important to further expand and diversify its uses.
Leif Armando Portal-Cahuana, Andrés Caceres Velarde, Gilmara Pires de Moura Palermo   +2 more
doaj   +1 more source

Artificial intelligence to growth stresses predicting in Eucalyptus clones using dendrometric variables and wood density

Maderas: Ciencia y Tecnología, 2023
Eucalyptus planted forests contribute to maximizing lumber production but problems such as longitudinal growth strain can negatively influence the quality of the products.
Thiago Campos Monteiro, Carlos Alberto Araújo Júnior, Jean Henrique dos Santos, Thiago Cardoso Silva, Thiago Magalhães do Nascimento, José Luiz Ferraresso Conti Junior, Jorge Luis Monteiro de Matos, Ricardo Jorge Klitzke, Márcio Pereira da Rocha   +8 more
doaj   +1 more source

QUALITY OF TROPICAL HARDWOOD FLOORS [PDF]

Revista Árvore, 2021
This study aimed to determine the basic density of the wood and to simulate the performance of flooring produced with wood from five tropical species: Dipteryx odorata (Cumaru), Handroanthus spp.
Ana Carolina Silva Costa, Aylson Costa Oliveira, Bárbara Luísa Corradi Pereira, José Reinaldo Moreira da Silva, Mônica Bezerra de Oliveira, Carolina Nogueira Xavier   +5 more
doaj   +1 more source

Caracterização da estrutura anatômica, densidade básica e morfologia de cavacos da madeira de Eucalyptus grandis para a produção de painéis MDF Characterization of wood anatomy, basic density, and morphology of Eucalyptus grandis chips for MDF production

Revista Árvore, 2008
O aumento na produção dos painéis "Medium Density Fiberboard" (MDF) confeccionados com madeira de espécies de Eucalyptus spp de rápido crescimento evidencia a necessidade da caracterização dos seus componentes celulares, da densidade básica e da ...
Ugo Leandro Belini, Mario Tomazello Filho, Matheus Perez Chagas, Carlos Tadeu dos Santos Dias   +3 more
doaj   +1 more source

Effect of Seed Source on Physical Properties of Scots Pine (a Case Study in Neka, Iran)

Drvna Industrija, 2013
This study investigated the seed source effect on the physical properties of exotic Scots pine (Pinus sylvestris). For this purpose, nine clear pine trees grown from the Spanish, Armenian and Serbian (part of former Yugoslavia) seed sources were selected
Mohammad Farsi, Majid Kiaei, Shahram Miar, Shirzad Mohammadnezhad Kiasari   +3 more
doaj   +1 more source