Results 21 to 30 of about 1,842,587 (278)

Fractal Dimensions of Cell Wall in Growing Cotton Fibers

open access: yesFractal and Fractional, 2020
In this research, fractal properties of a cell wall in growing cotton fibers were studied. It was found that dependences of specific pore volume (P) and apparent density (ρ) on the scale factor, F = H/h, can be expressed by power-law equations: P ...
Michael Ioelovich
doaj   +1 more source

Preparation of nickel-plated aluminum powder by displacement reduction method and its conductivity

open access: yesXi'an Gongcheng Daxue xuebao, 2021
In order to get good properties of nickel-plated aluminum powder, the nickel-plated aluminum powder was prepared by displacement reaction on the surface of the aluminum powder.
Wenqi ZHAO   +3 more
doaj   +1 more source

Study on Measuring Technology for Apparent Density of Outburst Coal

open access: yesMeikuang Anquan, 2020
In order to solve the problem that the apparent density measurement result of the coal body is inaccurate due to its small particle size, the feasibility of the coal seam apparent density measurement by simulating coal seam method is researched by ...
TIAN Shixiang, MA Ruishuai, ZOU Yihuai, LIN Huaying, XU Shiqing, ZENG Jianhua
doaj   +1 more source

Thermodynamical properties of the Universe with dark energy [PDF]

open access: yes, 2006
We have investigated the thermodynamical properties of the Universe with dark energy. Adopting the usual assumption in deriving the constant co-moving entropy density that the physical volume and the temperature are independent, we observed some strange ...
Akbar M Cai R G   +25 more
core   +2 more sources

Effect of Pressing Pressure on properties of Copper–10% Graphite Composites Prepared by Powder Metallurgy Technique

open access: yesTikrit Journal of Engineering Sciences, 2017
Copper metal has excellent thermal and electrical properties. It is suitable to use in many applications but it possesses relatively high friction and wear rate, So this research aimed to improve the behavior of the wear and reduce friction as well as ...
Hashim Sukor Humood AlGharagoly
doaj   +1 more source

Pengaruh Penambahan Arang Pelepah Sawit terhadap Sifat Mekanik Batu Bata Merah

open access: yesJurnal Ilmiah Biosaintropis (Bioscience-Tropic), 2023
Brick is a building material that is often used for residential walls. The bricks in this study were bricks with the addition of palm frond charcoal in the manufacturing process. The aims of this study were (1) to determine the effect of adding palm stem
Cory Dian Alfarisi   +5 more
doaj   +1 more source

Development and Characterization of Tailored Polyurethane Foams for Shock Absorption

open access: yesApplied Sciences, 2022
In this paper, different types of polyurethane foams (PUR) having various chemical compositions have been produced with a specific density to monitor the microstructure as much as possible.
Boumdouha Noureddine   +5 more
doaj   +1 more source

Apparent Scarcity of Low-Density Polymorphs of Inorganic Solids [PDF]

open access: yes, 2010
For most inorganic solids, very few dense polymorphs and no low-density polymorphs are observed. Taking a wide range of tetrahedrally-coordinated binary solids (e.g., ZnO, GaN) as a prototypical system, we show that the apparent scarcity of low-density ...
Bromley, ST, Illas, F, Zwijnenburg, MA
core   +1 more source

Potential Energy Landscape of the Apparent First-Order Phase Transition between Low-Density and High-Density Amorphous Ice

open access: yes, 2016
The potential energy landscape (PEL) formalism is a valuable approach within statistical mechanics for describing supercooled liquids and glasses. Here we use the PEL formalism and computer simulations to study the pressure-induced transformations ...
Allen M. P.   +6 more
core   +1 more source

Estudio de correlación y variabilidad de los métodos de inmersión en mercurio y el método capacitivo resonante para determinar densidad aparente de material cerámico crudo

open access: yesBoletín de la Sociedad Española de Cerámica y Vidrio, 2011
In this paper, we present the results of the correlation study of the variables and parameters associated with the measurement of the apparent density (AD) for raw ceramic material used in the industrial manufacture of floor tiles, compared the mercury ...
Rodríguez P., O.   +6 more
doaj   +1 more source

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