Results 31 to 40 of about 4,345,907 (196)

Structural and heat-insulating foam concrete for individual monolithic housing construction [PDF]

open access: yesНанотехнологии в строительстве
Introduction. The article presents the results of studies of structural and heat-insulating cement-based foam concrete for monolithic individual housing construction using porous aggregates sand and superplasticizers.
Aleksei B. Steshenko   +3 more
doaj   +1 more source

Fracture Load Prediction of Non-Linear Structural Steels through Calibration of the ASED Criterion

open access: yesMetals, 2023
In this work, the application of the Average Strain Energy Density (ASED) criterion for the estimation of failure loads in materials with nonlinear behavior containing U-shaped notches is presented.
Marcos Sánchez   +3 more
doaj   +1 more source

Analyzing the Advantage of Combination of Density Forecasts in Tehran Stock Exchange [PDF]

open access: yesInternational Journal of Industrial Electronics, Control and Optimization, 2021
Today, stock market plays a key role in the economy of any country and is considered as one of the growth indicators of any economy. Gaining the skills of gathering and analyzing data simultaneously, as well as using this knowledge in economic ...
S.Raheleh Shahrokhi   +2 more
doaj   +1 more source

Breast cancer risk factors and mammographic density among 12518 average-risk women in rural China

open access: yesBMC Cancer, 2023
Background Mammographic density (MD) is a strong risk factor for breast cancer. We aimed to evaluate the association between MD and breast cancer related risk factors among average-risk women in rural China.
Huijiao Yan   +7 more
doaj   +1 more source

Changes in growth-production parameters of Lolium perenne L. turf after application of concentrated polysulfide fertilizer [PDF]

open access: yesActa Fytotechnica et Zootechnica, 2020
The changes in growth rate, daily production of above-ground phytomass and lawn density of turfgrass after application of fertilizer based on polysulfide (Sulka NKS+) were evaluated in Nitra (the Slovak Republic) climatic conditions.
Peter Kovár, Luboš Vozár, Peter Hric
doaj   +1 more source

Size-Dependent Transition to High-Dimensional Chaotic Dynamics in a Two-Dimensional Excitable Medium [PDF]

open access: yes, 1997
The spatiotemporal dynamics of an excitable medium with multiple spiral defects is shown to vary smoothly with system size from short-lived transients for small systems to extensive chaos for large systems.
A. Garfinkel   +31 more
core   +3 more sources

A deep learning-based reconstruction model for 3D sound speed field combining underwater vertical information

open access: yesFrontiers in Marine Science
IntroductionThe sound speed in the ocean significantly influences the propagation characteristics of underwater acoustic signals. Rapid acquisition of underwater three-dimensional (3D) sound speed fields is essential for target detection, acoustic ...
Hongchen Li   +6 more
doaj   +1 more source

The Average Structural Density of Barite Crystals of Different Habit Types

open access: yesGeologia Croatica, 2010
Eight different habit types of barite crystals which could be classifiedinto 4 essentially different groups were determined by morphologicalanalysis: Eb group - barite crystals elongated in the [010] direction; Ea group - barite crystals ...
Biserka Radanović-Gužvica
doaj   +1 more source

On the Average Comoving Number Density of Halos

open access: yes, 2006
I compare the numerical multiplicity function given in Yahagi, Nagashima & Yoshii (2004) with the theoretical multiplicity function obtained by means of the excursion set model and an improved version of the barrier shape obtained in Del Popolo & Gambera
A. Del Popolo   +13 more
core   +1 more source

Vertical electron density profiles from digisonde ionograms. The average representative profile

open access: yesAnnals of Geophysics, 1996
Profile calculations from ionograms using the Huang-Reinisch technique arrive at a set of boundary values and coefficients that describe the profile.
B. W. Reinisch, X. Huang
doaj   +1 more source

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